What is an Accelerant?
Accelerator'promoter. When used in combination with a catalyst or fixative, a substance that can increase the reaction rate in a smaller amount.
- Chinese name
- Accelerator
- Foreign name
- accelerator'promoter
- Definition
- Less amount of substance to increase reaction rate
- Exterior
- White powder
- Classification
- 7 categories
- Ignition point
- Can be ignited by an open flame at room temperature
- Store
- Store indoors, dry and ventilated
- Accelerator'promoter. When used in combination with a catalyst or fixative, a substance that can increase the reaction rate in a smaller amount.
Accelerator Basic Information
- Properties: This product is a white powder, which can be sublimated when heated to 200 ° C. It can be ignited by an open flame at room temperature, and is difficult to dissolve in ether, aromatic hydrocarbons, etc.
- Uses: It is mainly used in radial tires. First, it is used as a curing agent for reinforcing resins to improve the hardness of rubber products. Second, it is used to form a bonding system with resorcinol and other additives to bond rubber to fibers. Important role.
- Packaging: Packed in a woven bag lined with plastic bags, net weight 20kg.
- Storage: Stored indoors, dry and ventilated, high temperature and fireproof, storage period is half a year. After the storage period, it can still be used after passing the inspection.
Accelerator classification
- There are many types of accelerators and it is difficult to classify them. This article classifies the accelerators that are suitable for various adhesives.
- Accelerator for epoxy resin
- a, fatty amine accelerator: DMP-30, EP-184, triethanolamine, etc.
- b, acid anhydride accelerator: BDMA, CT-152x, DBU, etc.
- c. Polyetheramine catalyst: EP-184, 399, etc.
- d. Latent catalyst: K-61B, CT-152X, etc.
- Accelerator for polyurethane adhesive
- a. Amine accelerators: triethylenediamine, A-1, A-33, DC-829, etc.
- b. Tin accelerators: dibutyltin dilaurate, stannous octoate, CT-E229, etc.
- (3) Accelerators for phenolic resin adhesives (stannous chloride, ferric chloride, p-chlorobenzoic acid, accelerator M).
- Accelerators for unsaturated polyester resin adhesives (cobalt naphthenate, cobalt isooctanoate, zinc isooctanoate, N, N-dimethylaniline, N, N-diethylaniline, vanadium phosphate, etc.).
- Accelerator for fast curing acrylate structural adhesive (NA-22, tetramethylthiourea, vanadium acetylacetonate, acetylacetone, triphenylphosphine, n-butyraldehyde-aniline condensate 808, benzyldimethylamine) .
- Accelerator for anaerobic adhesive (N, N-dimethyl-p-methylaniline, triethylamine, hydroquinoline, 8-hydroxyquinoline, saccharin, ferrocene, aluminum triacetylacetonate).
- Accelerators for rubber and rubber-type adhesives (accelerators D, DETU, DPG, M, TMTD, BZ, PZ, ZDC, CZ).
Accelerator classification
- Mechanism and influence: Vulcanization accelerator is referred to as accelerator. Substances that promote vulcanization. It can shorten the vulcanization time or temperature of rubber, reduce the amount of vulcanizing agent, and improve the physical and mechanical properties of rubber. Can be divided into two categories of inorganic accelerators and organic accelerators. Among the inorganic accelerators, except zinc oxide, magnesium oxide, and lead oxide, which are used in small amounts, the rest are mainly used as auxiliary accelerators. Most of them are organic accelerators. various kinds. Some vulcanization accelerators have a bitter taste (such as vulcanization accelerator M), some discolor the product (such as vulcanization accelerator D), some have a vulcanization effect (such as vulcanization accelerator TT), and some have anti-aging effects or plasticity. Solution (such as vulcanization accelerator M).
- Speed of action: According to the speed of action, it can be divided into accelerators such as slow speed, medium speed, medium speed, speed and speed. In addition, there are after-effect accelerators. Mainly nitrogen- and sulfur-containing organic compounds, such as aldehydes (such as vulcanization accelerator H), guanidines (such as vulcanization accelerator D), thiurams (such as vulcanization accelerator TT), and thiazoles (such as vulcanization accelerator) Accelerator M), dithiocarbamates (such as vulcanization accelerator ZDMC), xanthates (such as vulcanization accelerator ZBX), thioureas (such as vulcanization accelerator NA-22), sulfenamides (Such as vulcanization accelerator CZ) and so on. Generally, it can be used alone or in combination according to specific conditions.
Accelerator selection
- Select effective accelerators according to different types of adhesives.
- Accelerators and curing agents should have good matching properties, they should not be incompatible and should be able to coordinate.
- (3) The amount of addition is small, and the promotion efficiency is high.
- Does not affect the technical properties and physical and mechanical properties of the adhesive.
- Mix two or more types of accelerators to complement each other and increase the effectiveness of promotion.
- Non-toxic or low-toxic, no harm to human body and environment.
Development of accelerators
- The development of accelerators is high-performance, multifunctional, and environmentally friendly. Germany has introduced Deovulc BGl87 and Rhincure AP series of mixed accelerators, which have high promotion efficiency and do not produce nitrosamines. The new Vulkacit CRV / LG (3-methylthiazolidine-thione-2) from Bayer, Germany, can replace the suspected carcinogenic NA-22 and is suitable for neoprene. The multifunctional accelerator has the functions of other auxiliary agents, such as 1- (N-oxydiethylenethiocarbamoyl) -2- (N-oxydiethylene) thiobenzimidazole (MBSPT) and It has the effect of accelerator and antioxidant, and its antioxidant effect is equivalent to 4010NA, which is better than antioxidant MB.
Accelerator combustion dosage form
- Combustion accelerator
Accelerator description
- AMERGY5000 combustion accelerator contains a unique combination of a variety of organometallic catalysts, the main role
- In the promotion of oxidative combustion of heavy fuel oil and promote more complete combustion of fuel oil. It can be completely dissolved in various levels of fuel oil,
- Can be used in diesel engines and boiler installations.
- Accelerator
- Accelerators will result in higher thermal and mechanical loads than the engine's maximum continuous output. In addition, due to poor combustion, the fuel injection nozzles will be blocked, carbon deposits on the piston rings, the turbocharger, and the exhaust pipe will catch fire.
- In the use of boilers, because the fuel oil contains a high carbon content, similar to incomplete combustion, carbon deposits in the superheated tubes of the furnace tubes, even blockage of the economizer, and more carbon particles are discharged from the flue.
- During the combustion process, because the combustion catalyst contained in AMERGY500 releases free ions, it has the function of carrying oxygen to the combustion center in order to improve the fuel-air mixing ratio and make the combustion more complete. Because more complete combustion is achieved, there will be less heat transfer surface in the engine, exhaust system and boiler due to incomplete combustion of carbon.
Accelerator characteristics
- 1. High-efficiency combination, mixed with high-efficiency organic gold. Reduced carbon deposits in piston rings and grooves.
- Metal Combustion Catalyst
- 2. Lubricant is cleaner after use
- 3 · Maintain TBN value in lubricating oil
- 4 · Reduce carbon deposits on the exhaust side and in the supercharger
- 5 · Maintain a cleaner heat transfer surface
- 6.Improve the mixing ratio of fuel and air
- 7 · Reduce carbon emissions from the exhaust side
- 8 · Improve combustion efficiency and reduce black smoke emissions
- 9 · No separation and precipitation. Very stable during storage, no deterioration
Accelerator other
- Microbial culture promoter
Accelerator concept
- Promoters are those nutrients that are not necessary for cell growth and are not precursors, but additives that can increase yield after being added.
Accelerator effect
- Promoters are not precursors or nutrients that can affect normal metabolism, or promote the accumulation of intermediate metabolites, or increase the production of secondary metabolites
- E.g
- Barbiturate can increase the anti-autolysis ability of streptomycin-producing bacteria, delay the autolysis time, and increase streptomycin accumulation.
- When C. glutamicum produces lysine, the addition of erythromycin can increase the yield by more than 25%.
Accelerator action mechanism
- The mechanism by which accelerators increase yields is not completely clear, and the reasons are manifold.
- For example, in the production of enzyme preparations, some promoters are themselves inducers of enzymes; some promoters are surfactants, which can improve the permeability of cells and improve the contact between cells and oxygen to promote the secretion and production of enzymes. The active agent has a protective effect on the surface inactivation of the enzyme; some promoters have the effect of precipitating or chelating harmful metal ions.
- The effects of various promoters are not only affected by the species and age of the bacteria, but also related to the composition of the medium used. It will be different.
Accelerator use
- The addition ratio of AMERGY5000 combustion accelerator is 1/1000 ~ 1/6000 and fuel mixture ratio. Other specific addition ratios can be determined based on the design of the engine and boiler, fuel quality, and system operating procedures. AMERGY5000 can be added to the fuel tank directly when refueling to reduce mixing time, or added to the fuel tank before refueling to promote complete mixing with fuel. The most correct way to add AMERGY5000 is: use a fixed displacement pump to continuously add to the fuel system from the suction end of the fuel supply pump.
Accelerator physical properties
- Appearance: clear, dark brown liquid
- Accelerator
- Flash point:> 60
- Flow point: -46 ° C
- Solubility: completely soluble in oil
- Accelerator-928 adhesion promoter
Accelerator application system
- PU / NC, NC / PA, CAB, PVB, EVA, PU, chlorinated polyolefin and other ink systems
- Accelerator
- Color: transparent yellow liquid
- Solid content: 50%
- Specific gravity: 1.00 ± 0.5
- Flash point: 25
- Viscosity: Zahn 4 # cup 30.5 ± 0.5S (room temperature)
- PH value: 6
- Adding amount: 5-10%
- Fourth, packaging:
- 25KG / 180KG
Accelerator profile
- (Developed by China Rubber Industry Association · Draft for Soliciting Opinions)
Accelerator Specification Purpose
- In order to further improve the quality level of vulcanization accelerator NS products, better meet the requirements of rubber industry products, create product brands and cultivate brand-name products, improve the competitiveness of enterprises, increase economic and social benefits, this specification is formulated.
- This specification is applicable to vulcanization accelerator NS made from industrial tert-butylamine and vulcanization accelerator MBT by sodium hypochlorite oxidation.
- Commodity name: Vulcanization accelerator NS
- English abbreviation: TBBS
- Chemical name: N-tert-butyl-2-benzothiazolyl sulfenamide
- Molecular formula: C11H14N2S2
- Structural formula:
Accelerator specification index
- Technical indicators of the vulcanization accelerator NS brand products should meet the requirements of the following table:
- Project indicators
- Appearance milky white or light yellow brown powder, granular
- Purity,% 97.0
- Free amine,% 0.50
- Initial melting point, 105.0
- Loss on heating (60 65 ),% 0.40
- Ash content,% 0.40
- Screen residue (149 & micro; m),% 0.10
- Methanol insolubles,% 0.50
- Note: The granulated NS is not used as sieve residue.
Accelerator self-regulation
- 1 Management Functions
- China Rubber Industry Association Auxiliary Specialty Committee is the organization and implementation and coordinator of self-regulatory regulations for the industry of accelerator products. The specific work is carried out by the Auxiliary Expert Group of the Technical Economic Committee.
- 2 Quality Credit
- According to the classification of rubber additives, quality credit is granted to rubber additives products.
- 3 Quality Inspection
- All brands applying for the vulcanization accelerator NS brand products and brands that have passed the quality credit shall undergo quality inspection at least once a year.
- Attachment: Testing methods, inspection rules, and marking, packaging, transportation, and storage regulations for vulcanization accelerator NS products.
- Attachment: Test rules for testing methods of vulcanization accelerator NS products
Accelerator storage regulations
- 1. experiment method
- Accelerator
- 2 Determination of purity and free amine
- 2.1 Instrument
- 10ml burette, 50ml burette, balance, mortar, laboratory standard glassware, water bath
- 2.2 Reagent
- 2.2.1 Solvent: Isopropanol and toluene are prepared at a volume ratio of 5: 3.
- 2.2.2 Titrant: 0.1mol / L hydrochloric acid, 0.5mol / L hydrochloric acid
- 2.2.3 Bromophenol blue indicator: 0.5g / L dissolve bromophenol blue in 96% ethanol
- 2.2.4 Reducing agent: M solution40g / L mercaptobenzothiazole is dissolved in 96% ethanol (replace every week)
- 2.2.5 Titrant: 0.1mol / L sodium hydroxide
- 2.3 Test steps
- Preparation: at least 10g of sample, put into a mortar and grind to a uniform fine powder,
- 2.3.1 Weigh a certain amount of fine powder sample (accurate to 0.1mg) and put it into a 250ml triangle bottle (see table for weighing).
- 2.3.2 Add 100ml of isopropanol / toluene solvent. The sample is dissolved by shaking and stirring to avoid heating.
- 2.3.3 Add 8 drops of bromophenol blue indicator.
- 2.3.4 Stir titration with 0.1mol / L hydrochloric acid until the green color disappears and the yellow color appears. This only takes a few drops and the volume of hydrochloric acid used is recorded (the titration should be fast to prevent sulfenamide hydrolysis).
- 2.3.5 Add 50ml of reducing agent, and then accurately add 25.00ml of 0.1mol / L hydrochloric acid and mix, and make it react according to the water bath temperature and time required in the table.
- 2.3.6 Stir titration with 0.1mol / L sodium hydroxide until yellow disappears and blue appears. Record the volume of sodium hydroxide consumed.
- 2.3.7 Make another blank test without adding samples for comparison.
- Calculation:
- Free amine sulfenamide
- Among them, V1 -------------------- volume of hydrochloric acid consumed by titration sample ml
- V2 -------------------- volume of hydrochloric acid consumed by titration blank ml
- V3 -------------------- volume of sodium hydroxide consumed by titration blank ml
- V4 -------------------- volume of sodium hydroxide consumed by titration sample ml
- C1 --------------------- Concentration of hydrochloric acid standard solution mol / L
- C2 --------------------- Sodium hydroxide standard solution concentration mol / L
- m --------------- sample mass g
- 0.0731 ----------- free amine coefficient
- 0.2384 ---------- sulfenamide coefficient
- Related data sheet
- Weighing weight of sample of sulfenamide accelerator (g) Requirement of reaction time in water bath (min) Temperature ()
- CZ (CBS) 0.37 5 ± 1 25 ± 1
- NS (TBBS) 0.33 5 ± 1 25 ± 1
- DZ (DCBS) 0.48 15 ± 1 55 ± 1
- NOBS (MBS) 0.35 15 ± 1 55 ± 1
- 3 melting point determination
- 3.1 According to GB / T11409.1 (capillary method).
- 3.2 Allowable difference: The difference between two results measured in parallel should not be greater than 0.5 ° C. The arithmetic mean of the two results measured in parallel is taken as the melting point of the sample.
- 4 Heating loss
- 4.1 Carry out according to GB / T11409.4, heating temperature is 60 65 .
- 4.2 Allowable difference: The difference between two results measured in parallel is not more than 0.05%. The arithmetic average of the two results measured in parallel is taken as the heating loss of the sample.
- 5 Determination of ash
- 5.1 Carry out according to the provisions of GB / T11409.7, weigh 3.0g, and the burning temperature is 800 ± 10 .
- 5.2 Allowable difference: The difference between two results measured in parallel is not more than 0.04%, and the arithmetic mean of the two results measured in parallel is taken as the ash of the sample.
- Determination of 6 sieve residue
- 6.1 According to GB / T11409.5 (dry method), the standard sieve specifications: 200 × 50 / 149 & micro; m.
- 6.2 Allowable difference: The difference between two results measured in parallel is not more than 20% of the arithmetic mean. The arithmetic mean of two results measured in parallel is used as the sieve residue of the sample.
- 7 Determination of methanol insolubles
- 7.1 Instrument
- a) Sand core crucible 30mLl (4 );
- b) 500mL filter bottle;
- c) dryer;
- d) electro-optical analytical balance;
- e) Electric heating thermostat;
- 7.2 Reagent
- Methanol, analytical grade
- 7.3 Determination procedure
- Weigh 1g sample (accurate to 0.1mg) and place it in a sand core crucible that has been constant weight in an oven at 70-75 ° C. Place the sand core crucible on a suction filter bottle and connect it to a vacuum pump. Add about 50 ° C. 20mL of hot methanol
- Let it stand for 5 minutes to dissolve and then start suction filtration, then wash it 4 times with 20 mL of hot methanol at about 50 ° C each time. After drying, remove the sand core crucible and put it in an oven at 70-75 ° C for 30 minutes, then move it to a dryer to cool to room temperature. , Weighing.
- 7.4 Representation and calculation of results
- The percentage of methanol insolubles X is calculated as follows:
- m1m2
- X = × 100
- m
- In the formula: m1mass of sand core crucible and residue, g;
- m2mass of sand core crucible, g;
- msample mass, g;
- 7.5 Allowable difference
- The difference between two results measured in parallel is not more than 0.10%, and the arithmetic mean is taken as the measurement result.
- 2. sampling
- 4 If an inspection result does not meet the requirements of this standard, the item shall be sampled and re-examined from twice the packaging container. If the re-examination result still does not meet the standard, the batch of products is judged to be non-conforming.
- 2. testing regulations
- 1 Factory inspection
- Accelerator NS is self-tested by the inspection department of the manufacturer. The manufacturer shall ensure that all the ex-factory accelerators NS meet the requirements of technical conditions, and each batch of the ex-factory accelerator NS shall be accompanied by a quality certificate in a certain format.
- 2 Inspection by National Testing Center
- According to the requirements of this specification, the Material Research and Testing Center of the China Rubber Industry Association is responsible for conducting spot checks and inspections on the quality of the accelerator NS and publishing it in relevant media.
- 3 sets of batch rules
- Take one batch of even product.
- 4 Sampling and sampling methods:
- Sampling can be purchased directly in the market, or sampled at the production enterprise.
- Sampling method: Sampling according to Table 2 in GB / T6678. After the samples are carefully mixed, a sample of not less than 300 g is taken by the quarter method, and the two samples are filled into clean and dry two ground-mouth bottles or ziplock bags. Seal the bottle mouth and indicate the name of the manufacturer, product name, batch number, sampling date, and name of the sampling person. One bottle (bag) is tested, and the other bottle is stored in a dark place for re-examination. The storage period is three months.
- 5 retest
- When one or more of the inspection results do not meet the requirements of this specification, the item shall be re-sampled from twice the amount of packaging and re-inspected. If the retest results still do not meet this standard, the batch of products is not in line with the brand-name products.
- 3 Signs, labels, packaging
- 1 Product is divided into routine inspection and full inspection. Routine inspection items: appearance, melting point and heating loss; all inspections are regular inspections of the products in the warehouse.
- Accelerator 3.2 products are inspected by the quality inspection department. They can only be shipped from the factory after meeting the requirements of this standard, and an inspection report is attached.
- 3 The product is a batch every day. The product name, manufacturer, batch number, net weight, etc. should be on the factory packaging bag.
- 4 The product packaging bag should be "three-in-one" (kraft paper on the outer layer, polyethylene on the middle layer, and plastic woven cloth on the inner layer by heat pressing). Each bag is 20 + 0.1.
- 5 Packaging products should be stored in a cool and dry warehouse, the distance from the wall should be greater than 0.5 meters, should not be placed directly on the ground, not close to the source of fire. Product storage period is 6 months.
- 6 The product should be protected from sun, rain and moisture during transportation, and should be handled with care during loading and unloading to prevent damage and leakage.
Symptoms of promoter poisoning
- Nausea, vomiting, abdominal pain, diarrhea, severe cases include headache, dizziness, rapid heart rate breathing, decreased blood pressure, convulsions, circulatory failure, and even death from paralysis of the respiratory center.
Accelerator emergency treatment
- Those who have ingested food immediately induce vomiting, gastric lavage, catharsis, and symptomatic treatment. Avoid oily food, prohibit alcohol.
Accelerator precautions
- [1] Can not be mixed with lime, sulfur, copper preparations and lead arsenate, mainly for disease prevention, it should be used early.
- [2] The medicine should be stored in a cool, dry place.
Accelerator Specification
- Accelerator'promoter. When used in combination with a catalyst or fixative, a substance that can increase the reaction rate in a smaller amount. Mainly nitrogen- and sulfur-containing organic compounds, there are aldiamines (such as vulcanization accelerator H), guanidines (such as vulcanization accelerator D), thiurams (such as vulcanization accelerator TT), thiazoles (such as vulcanization Accelerator M), dithiocarbamates (such as ZDMC), xanthates (such as ZBX), thioureas (such as NA-22), sulfenamide (Such as vulcanization accelerator CZ). Generally, it can be used alone or in combination according to specific conditions.
Accelerator properties
- This product is a white powder that sublimes and decomposes when heated to 200 ° C. It can be ignited by an open flame at room temperature and is difficult to dissolve in ether and aromatic hydrocarbons. Uses: It is mainly used in radial tires. First, it is used as a curing agent for reinforcing resin to improve the hardness of rubber products. Important role.
Accelerator packaging
- Packed in woven bags lined with plastic bags, net weight 20kg.
Accelerator storage
- Stored indoors, dry and ventilated, high temperature and fireproof, storage period is half a year. After the storage period, it can still be used after passing the inspection.
Combustion promoter
Accelerator description
AMERGY5000 combustion accelerator contains a unique blend of a variety of organometallic catalysts, which are mainly used to promote the oxidative combustion of heavy fuel oil and promote more complete combustion of fuel oil. It can be completely dissolved in various levels of fuel oil,
Can be used in diesel engines and boiler installations.
Marine oil usually contains residues after thermal cracking and residues of higher aromatic hydrocarbons. As a result, the ignition quality is lower, and the ignition delay and excessive fuel injection are caused. If there is too much heat release and higher pressure rise during combustion.
- Accelerators will cause thermal and mechanical loads to be higher than the engine's maximum continuous output. In addition, due to poor combustion, fuel injection nozzles are blocked, carbon deposits on piston rings, superchargers, and smoke exhaust pipes catch fire.
In the use of boilers, because the fuel oil contains a high carbon content, similar to incomplete combustion, carbon deposits in the superheated tubes of the furnace tubes, even blockage of the economizer, and more carbon particles are discharged from the flue.
During the combustion process, because the combustion catalyst contained in AMERGY500 releases free ions, it has the function of carrying oxygen to the combustion center in order to improve the fuel-air mixing ratio and make the combustion more complete. Because more complete combustion is achieved, there will be less heat transfer surface in the engine, exhaust system and boiler due to incomplete combustion of carbon.
Accelerator characteristics
- benefit:
· High-efficiency combination, mixed with high-efficiency organic gold. · Reduction of compound combustion catalyst in carbon deposit piston ring and grooves. · Lubricant is clean after use. · Maintain TBN value in lubricant. Gas side and supercharger · Maintain a clean heat transfer surface · Improve the mixing ratio of fuel and air · Reduce the emission of carbon particles from the exhaust side · Improve the combustion efficiency and reduce the emission of black smoke Very stable without deterioration
Accelerator use
The addition ratio of AMERGY5000 combustion accelerator is 1/1000 ~ 1/6000 and fuel mixture ratio. Other specific addition ratios can be determined based on the design of the engine and boiler, fuel quality, and system operating procedures.
AMERGY5000 can be added to the fuel tank directly when refueling to reduce mixing time, or added to the fuel tank before refueling to promote complete mixing with fuel.
The most correct way to add AMERGY5000 is: use a fixed displacement pump to continuously add to the fuel system from the suction end of the fuel supply pump.
Accelerator physical properties
Appearance: clear, dark brown liquid Specific gravity: 0.98 (at 25 ° C)
Flash point:> 60
Flow point: -46 ° C
Solubility: completely soluble in oil
Accelerator special polyester
Accelerator Product Introduction
- 928 is a special polyester adhesion promoter, which has better stability at room temperature and is beneficial to the storage stability of ink. When the temperature rises to a certain degree, the reactive groups of the resin and the substrate will undergo a crosslinking reaction. Improve the adhesion of the ink, and at the same time, the physical properties such as heat resistance, chemical resistance and water resistance of the ink will be improved. Its main advantages are as follows:
1. Improve ink adhesion to various materials (treated OPP / PE / PP / PET / nylon / aluminum foil / metal / glass, etc.)
2. 2. Improve the thermal stability of the ink. 3. Improve the water resistance and chemical resistance of the ink. 4. Improve the gloss of the ink. Improve the dispersion of ink in ink
Accelerator application system
- PU / NC, NC / PA, CAB, PVB, EVA, PU, chlorinated polyolefin and other ink systems
Accelerator technical indicators
- Color: transparent yellow liquid Solid content: 50%
Specific gravity: 1.00 ± 0.5
Flash point: 25
Viscosity: Zahn 4 # cup 30.5 ± 0.5S
PH value: 6
Adding amount: 5-10%
Accelerator packaging
25KG / 180KG
Accelerator-Vulcanization Accelerator Quality Industry Self-Regulatory Code (Developed by China Rubber Industry Association · Draft for Soliciting Opinions)
1. The purpose of the specification is to further improve the quality level of the vulcanization accelerator NS products, better meet the requirements of rubber industry products, create product brands and cultivate brand-name products, improve the competitiveness of enterprises, increase economic and social benefits, this specification is specially formulated.
This specification applies to vulcanization accelerator NS made from industrial tert-butylamine and vulcanization accelerator MBT by sodium hypochlorite oxidation.
Commodity name: Vulcanization accelerator NS
English abbreviation: TBBS
Chemical name: N-tert-butyl-2-benzothiazolyl sulfenamide Molecular formula: C11H14N2S2
Structural formula:
2. Specification index Technical index of vulcanization accelerator NS brand products should meet the requirements of the following table:
Project indicators Appearance: milky white or light yellow brown powder, granular purity,% 97.0
Free amine,% 0.50
Initial melting point, 105.0
Loss on heating (60 65 ),% 0.40
Ash content,% 0.40
Screen residue (149µm),% 0.10
Methanol insolubles,% 0.50
Note: The granulated NS is not used as sieve residue.
- 3 Self-discipline Management 3.1 Management Functions China Rubber Industry Association Specialty Committee is vulcanization accelerator NS
- The organization, implementation and coordination of self-regulatory regulations for the industry of accelerator products. The specific work is carried out by the assistant expert group of the Technical and Economic Committee.
3.2 Quality Credit According to the classification of rubber auxiliaries, quality credit should be implemented for rubber auxiliaries.
3.3 Quality inspection All brands applying for vulcanization accelerator NS brand products and brands that have passed the quality credit shall undergo quality inspection at least once a year.
Attachment: Testing methods, inspection rules, and marking, packaging, transportation, and storage regulations for vulcanization accelerator NS products.
- Attachment: Rules for Testing Methods of Vulcanization Accelerator NS Products, Marks, Packaging, Transportation and Storage Regulations
- 1. Test method 1.1 Appearance: Visual inspection 1.2 Determination of purity and free amine 1.2.1 Instrument 10ml burette, 50ml burette, balance, mortar, laboratory standard glassware, water bath 1.2.2 Reagent 1.2.2.1 Solvent: isopropanol and toluene with 5 : 3 volume ratio 1.2.2.2 titrant: 0.1mol / L hydrochloric acid, 0.5mol / L hydrochloric acid 1.2.2.3 bromophenol blue indicator: 0.5g / L dissolve bromophenol blue in 96% ethanol 1.2.2.4 Reducing agent: M solution-40g / L mercaptobenzothiazole dissolved in 96% ethanol (replaced every week)
1.2.2.5 Titrant: 0.1mol / L sodium hydroxide 1.2.3 Test procedure Preparation: At least 10g of sample, put into a mortar and grind to a uniform fine powder, and then reserve it.
1.2.3.1 Weigh a certain amount of fine powder sample (accurate to 0.1mg) and put it into a 250ml triangle bottle (see table for weighing).
1.2.3.2 Add 100ml of isopropanol / toluene solvent. The sample should be dissolved by shaking and stirring to avoid heating.
1.2.3.3 Add 8 drops of bromophenol blue indicator.
1.2.3.4 Stir titration with 0.1mol / L hydrochloric acid until the green color disappears and the yellow color appears. This only takes a few drops and the volume of hydrochloric acid used is recorded (the titration should be fast to prevent sulfenamide hydrolysis).
1.2.3.5 Add 50ml of reducing agent, and then accurately add 25.00ml of 0.1mol / L hydrochloric acid and mix it, and make it react according to the water bath temperature and time required in the table.
1.2.3.6 Stir titration with 0.1mol / L sodium hydroxide until the yellow color disappears and blue color appears. Record the volume of sodium hydroxide consumed.
1.2.3.7 Make another blank test without adding samples for comparison.
Calculation:
Free amine sulfenamide Among them, V1 -------------------- titration sample consumes hydrochloric acid volume ml
V2 -------------------- volume of hydrochloric acid consumed by titration blank ml
V3 -------------------- volume of sodium hydroxide consumed by titration blank ml
V4 -------------------- volume of sodium hydroxide consumed by titration sample ml
C1 --------------------- Concentration of hydrochloric acid standard solution mol / L
C2 --------------------- Sodium hydroxide standard solution concentration mol / L
m --------------- sample mass g
0.0731 ----------- Free amine coefficient 0.2384 ---------- Sulfinamide coefficient
- Relevant data sheet Weighing mass of sample of sulfonamide accelerator (g) Require water bath reaction time (min) Temperature ()
CZ (CBS) 0.37 5 ± 1 25 ± 1
NS (TBBS) 0.33 5 ± 1 25 ± 1
DZ (DCBS) 0.48 15 ± 1 55 ± 1
NOBS (MBS) 0.35 15 ± 1 55 ± 1
- 1.3 Determination of melting point 1.3.1 According to GB / T11409.1 (capillary method).
1.3.2 Allowable difference: The difference between two results measured in parallel should not be greater than 0.5 ° C, and the arithmetic mean of the two results measured in parallel is taken as the melting point of the sample.
1.4 Heating reduction 1.4.1 According to GB / T11409.4, heating temperature is 60 65 .
1.4.2 Allowable difference: The difference between two results measured in parallel is not more than 0.05%. The arithmetic average of the two results measured in parallel is taken as the heating loss of the sample.
1.5 Determination of ash 1.5.1 According to GB / T11409.7, the sample weight is 3.0g, and the burning temperature is 800 ± 10 .
1.5.2 Allowable difference: The difference between two results measured in parallel is not more than 0.04%, and the arithmetic mean of the two results measured in parallel is taken as the ash of the sample.
1.6 Determination of sieve residue 1.6.1 According to GB / T11409.5 (dry method), the standard sieve specification: 200 × 50 / 149µm.
1.6.2 Allowable difference: The difference between two results measured in parallel is not more than 20% of the arithmetic mean, and the arithmetic mean of two results measured in parallel is used as the sieve residue of the sample.
1.7 Determination of methanol insolubles 1.7.1 Apparatus a) Sand core crucible 30mLl (4 );
b) 500mL filter bottle;
c) dryer;
d) electro-optical analytical balance;
e) Electric heating thermostat;
1.7.2 Reagent methanol, analytical purity 1.7.3 Determination steps Weigh 1g sample (accurate to 0.1mg) and place it in a sand core crucible that has been constant weighted in an oven at 70 75 . On the filter bottle and connected to a vacuum pump, add 20 mL of hot methanol at about 50 ° C, and stir evenly.
- The accelerator was allowed to stand for 5 minutes to dissolve, and then suction filtration was performed, and then washed 4 times with 20 mL of hot methanol of about 50 ° C each time. After drying, the sand core crucible was taken out and dried in an oven at 70-75 ° C for 30 minutes. To room temperature, weigh.
1.7.4 Expression of results and calculation of the percentage content of methanol insolubles X:
m1m2
X = × 100
m
In the formula: m1mass of sand core crucible and residue, g;
m2mass of sand core crucible, g;
msample mass, g;
1.7.5 Allow the difference. The difference between the two results shall not be greater than 0.10%. The arithmetic mean shall be taken as the measurement result.
- 2. Sampling 2.4 If an inspection result does not meet the requirements of this standard, the item shall be sampled and re-examined from twice the packaging container. If the re-examination result still does not meet the standard, the batch of products is judged as a non-conforming product.
2. Inspection rules 2.1 The factory inspection accelerator NS is inspected by the inspection department of the manufacturer. The manufacturer shall ensure that all the ex-factory accelerators NS meet the requirements of technical conditions, and each batch of the ex-factory accelerator NS shall be accompanied by a quality certificate in a certain format.
2.2 Inspection by the National Testing Center The Material Research and Testing Center of the China Rubber Industry Association is responsible for conducting spot checks on the quality of the accelerator NS in accordance with the requirements of this specification and publishing it on relevant media.
2.3 The batch rules are based on a batch of evenly packed products.
2.4 Sampling and sampling methods:
Sampling can be purchased directly in the market, or sampled at the production enterprise.
Sampling method: Sampling according to Table 2 in GB / T6678. After the samples are carefully mixed, a sample of not less than 300 g is taken by the quarter method, and the two samples are filled into clean and dry two ground-mouth bottles or ziplock bags. Seal the bottle mouth and indicate the name of the manufacturer, product name, batch number, sampling date, and name of the sampling person. One bottle (bag) is tested, and the other bottle is stored in a dark place for re-examination. The storage period is three months.
2.5 If one or more of the re-inspection test results do not meet the requirements of this specification, the item shall be re-sampled from twice the amount of packaging and re-inspected. If the retest results still do not meet this standard, the batch of products is not in line with the brand-name products.
- 3 Marking, labeling and packaging 3.1 Products are divided into routine inspections and full inspections. Routine inspection items: appearance, melting point and heating loss; all inspections are regular inspections of the products in the warehouse.
Accelerator 3.2 products are inspected by the quality inspection department. They can only be shipped from the factory after meeting the requirements of this standard, and an inspection report is attached.
3.3 The product is a batch each day. The product name, manufacturer, batch number, net weight, etc. should be on the packaging bag.
3.4 Product packaging bags should be "three-in-one" (kraft paper in the outer layer, polyethylene in the middle layer, and plastic woven cloth in the inner layer through heat pressing). Paper-plastic composite bags, each bag is 20 + 0.1.
3.5 Packaged products should be stored in a cool and dry warehouse, the distance from the wall should be greater than 0.5 meters, should not be placed directly on the ground, and not close to the source of fire. Product storage period is 6 months.
3.6 The product should be protected from sun, rain and moisture during transportation, and should be handled with care during loading and unloading to prevent damage and leakage.