What Is a UV Absorber?

Ultraviolet absorbers are currently the most widely used class of light stabilizers. According to their structure, they can be divided into salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, and triazines. The most commonly used are benzophenones and benzotriazoles. The quencher is mainly a metal complex, such as a divalent nickel complex, and is often used in combination with an ultraviolet absorber to play a synergistic effect. ^[1]

UV absorber

UV absorber trade name phenyl salicylate

Phenyl o-hydroxybenzoate

Properties and uses: colorless crystalline powder. Has a pleasant aroma (holly oil smell). The density is 1.250g / cm3, the melting point is 43, and the boiling point (1.6kPa) is 173. Soluble in ether, benzene and chloroform, soluble in ethanol, almost insoluble in water and glycerol. The content is 99%.

This product is a UV absorber, used in plastic products, but has a narrow absorption wavelength range. The FDA has approved acrylic resin products for food contact.

Packaging and storage: Paper drums are lined with plastic bags. Store and transport according to general chemical regulations.

UV-P UV absorber trade name UV-P

Ingredient 2- (2-hydroxy-5-methylphenyl) benzotriazole

Properties and uses Appearance is colorless or light yellow crystal. Soluble in gasoline, benzene, acetone and other organic solvents. Solubility in water is very small, it will not be decomposed by concentrated alkali and concentrated acid. It can be ionized with heavy metals to form salts. Can absorb ultraviolet rays with a wavelength of 270 ~ 380nm. Melting point: 130 to 131.

This product is mainly used in polyester, chlorinated polyester, acetate fiber, polyvinyl chloride, polystyrene, organic glass, polyacrylonitrile and other resins. The stability in transparent articles is better than in colored articles. The amount used in the product is 0.% to 0.5%.

UV-O UV absorber trade name UV-O

Ingredient 2,4-Dihydroxybenzophenone

Properties and uses This product is light needle-like crystal or white powder. Moisture <0.5%. Ash 100ml solvent, 25 ° C) 50 acetone, benzene 1, ethanol> 50, water <0.5, n-heptane <0.5.

This product is a UV absorber, suitable for polyvinyl chloride, polystyrene, epoxy resin, cellulose resin, unsaturated polyester, coatings and synthetic rubber. The maximum absorption wavelength range is 280 ~ 340nm, the general dosage is 0.1% 1%. However, the light stabilization effect of this product is not outstanding.

Safety Precautions The oral LD50 of this product is 8.6g / kg body weight in mice and LD502.336mg / kg body weight in mice. There were no toxic effects at the doses of 0.19, 0.60, and 1.90 g / kg, and the development of the experimental animals in the other two doses had an effect on blood phase changes.

UV-9 Ultraviolet absorbent trade name UV-9

Ingredient 2-hydroxy-4-methoxybenzophenone

Properties and uses This product is light yellow or white crystalline powder. The density is 1.324 g / cm ³ (2 ° C 5). Melting point is 62-66 ° C. The boiling point is 150 160 (0.67kPa), 220 (2.4kPa). It is soluble in most organic solvents such as acetone, ketone, benzene, methanol, ethyl acetate, methyl ethyl ketone and ethanol, but insoluble in water. The solubility of this product in some solvents (g / 100g solvent, 25), in the solvent benzene 56.2, n-hexane 4.3, ethanol (95%) 5.8, carbon tetrachloride 34.5, styrene 51.2, DOP 18.7.

This product is a UV absorber, suitable for various plastics such as polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, unsaturated polyester, ABS resin, and cellulose resin. The maximum absorption wavelength range is 280 ~ 340nm , General dosage is 0.1% 1.5%, good thermal stability, decomposition at 200 . This product hardly absorbs visible light, so it is suitable for light-colored transparent products. This product can also be used in paint and synthetic rubber.

Safety Precautions Japan and Italy stipulate that when this product is used for food contact products, the maximum dosage should not exceed 0.3%.

UV-531 UV absorber trade name UV-531

Ingredient 2-hydroxy-4-n-octyloxybenzophenone

Properties and uses This product is light yellow or white crystalline powder. The density is 1.160g / cm3 (25 ° C). Melting point is 48-49 ° C. Soluble in acetone, benzene, ethanol, isopropanol, slightly soluble in dichloroethane, insoluble in water. The solubility of this product in some solvents (g / 100 solvent, 25 ° C) is 74, benzene 72, methanol 2, ethanol (95%) 2.6, n-heptane 40, n-hexane 40.1, and water 0.5 in acetone.

This product is an ultraviolet absorbent, which can strongly absorb ultraviolet rays with a wavelength of 240 ~ 340nm. It can be used for various plastics, especially polyethylene, polypropylene, polystyrene, ABS resin, polycarbonate, polyvinyl chloride and resin. Good compatibility and low volatility. The general dosage is 0.1% to 1%. With a small amount of 4,4-thiobis (6-tert-butyl-p-cresol), it has a good synergistic effect. The product can also be used as a light stabilizer for various coatings.

Safety Precautions This product is low in toxicity. Many countries have approved this product for use in food-contact plasticized products, such as the United States for polyolefins, the United Kingdom (up to 0.6%) and Italy (up to 0.5 for polyethylene and polypropylene %), The amount used in Japan is: polyethylene 0.5%, polypropylene 1%, AS resin and ABS resin 0.5%, polyvinyl chloride 0.2% (non-contact greasy food or ethanol food with more than 20% food).

UVP-327 UV absorber trade name UVP-327

Component 2- (2'-hydroxy-3 ', 5'-di-tert-phenyl) -5-chlorobenzotriazole

This product is an ultraviolet absorbent. Its characteristics and uses are similar to those of UV-326. It can strongly absorb ultraviolet rays with a wavelength of 270 to 380 nm. It has good chemical stability and minimal volatility. Compatible with polyolefins. Particularly suitable for polyethylene and polypropylene. In addition, it can also be used in polyvinyl chloride, polymethyl methacrylate, polyoxymethylene, polyurethane, unsaturated polyester, ABS resin, epoxy resin and cellulose resin. This product has excellent heat sublimation resistance, washing resistance, gas fade resistance, and mechanical property retention. Use with antioxidants for significant synergistic effects. To improve the thermal oxygen stability of the product. The general dosage of this product in plastic is 1% to 3%.

Safety precautions This product has low toxicity. Japan, the United States, France, Italy approved the product for use in food-contact polyolefin plastics, the maximum amount of 0.5%, used in other food-contact plastics, the maximum amount of 0.2 in Italy %, Japan and France are 0.5%.

RMB UV Absorber Trade Name UV Absorber RMB

Resorcinol monobenzoate

Properties and uses This product is white crystalline powder. It has a melting point of 132 to 135 ° C and a boiling point of 140 ° C (20Pa). Bulk density is 0.68g / cm ³ (20%). Soluble in acetone and ethanol, slightly soluble in benzene, water, n-heptane, etc.

This product is a UV light stabilizer with similar efficacy to benzophenone light stabilizers. Mainly used for polyvinyl chloride, cellulose resin, polystyrene, general dosage 1% ~ 2%.

AM-101 UV absorber trade name AM-101

Ingredient 2,2'-thiobis (4-tert-octylphenoloxy) nickel

Properties and uses This product is a green powder. The absorption peak in the ultraviolet region is 290 nm (in chloroform), which is suitable for polyolefin plastics such as polyethylene and polypropylene, and has particularly good light stabilization effect on films and fiber products. And can improve processing performance. This product has good synergistic effect when used in combination with ultraviolet absorber. Or further improve the light stabilization performance. Its main disadvantage is that the color is darker, which makes the product color, and at the same time, it assists the antioxidant effect with thioesters at high temperature, making the product grayish black.

Safety Precautions This product is toxic and should be used with caution.

GW-540 UV absorber trade name light stabilizer GW-540

Ingredient three (1,2,2,6,6-pentamethylpiperidinyl) phosphite

Properties and uses This product is white crystalline powder. Melting point is 122-124 ° C. Soluble in ethanol, chloroform, acetone, benzene and other solvents, difficult to dissolve in water.

This product is a hindered light stabilizer. It does not have the ability to absorb ultraviolet light, but it can capture active free radicals generated by polymer degradation, decompose hydroperoxides and transfer energy of excited molecules. The light stabilization effect is general ultraviolet 24 times the absorbent. This product is suitable for polyethylene, polyethylene and other plastics. It has good compatibility with resins and good processing performance. In addition to light stabilization, it also has good resistance to thermal oxygen aging. However, this product has poor heat resistance and should not be used for a long time in hot water. In addition, the product is best processed and used at a temperature below 270 ° C, and weight loss is more serious when this temperature is exceeded.

Safety Precautions This product has low toxicity.

744 UV absorber Trade name Light stabilizer 744

Ingredient 4-benzoyloxy-2,2,6,6-tetramethylpiperidine

Properties and uses This product is white crystalline powder. The melting point is 95-98 ° C, and the decomposition temperature is above 280 ° C. Soluble in acetone, ethanol, ethyl acetate, toluene, insoluble in water.

This product is a hindered light stabilizer, which has almost no ability to absorb ultraviolet rays, but can effectively capture active free radicals generated by polymer materials under the action of ultraviolet rays, thereby exerting light stabilization effects. This product is suitable for a variety of plastics such as polypropylene, polyethylene, polystyrene, polyurethane, polyamide and polyester, especially in polyolefins. The light resistance of this product is several times that of general ultraviolet absorbers. No coloring, no pollution, good heat-resistant processability, combined with antioxidant and ultraviolet absorber, it has excellent synergistic effect.

2,4,6-tris (2'-n-butoxyphenyl) -1,3,5-triazine

Ingredient 2,4,6-tris (2'-n-butoxyphenyl) -1,3,5-triazine

Properties and uses This product is light yellow powder. Melting point 156165. Soluble in hexamethylphosphoryl triamine, soluble in dimethylformamide when heated, slightly soluble in n-butanol, insoluble in water.

This product is an ultraviolet absorbent and can absorb ultraviolet rays with a wavelength of 300 to 380 nm. It is suitable for various plastics such as polyvinyl chloride, polyformaldehyde, and chlorinated polyether. The general dosage is 0.% to 1%. Its light stabilization efficiency is better than UV-9 and UV-531, but the product has colorability, which can make the product light yellow, and the compatibility with the resin is also poor.

HPT UV Absorber Trade Name Light Stabilizer HPT

Hexamethylphosphoryltriamine

Properties and uses The product is colorless or light yellow transparent liquid. Slightly astringent. The density is 1.0253 to 1.0257 g / cm ³ (20 ° C). The freezing point is 27 ° C, and the boiling point is 116-117 ° C (1.48kPa). The refractive index is 1.4582 to 1.4589 (20 ° C). It is soluble in polar and non-polar solvents, and can be miscible in any proportion with commonly used plasticizers such as dioctyl phthalate, dioctyl sebacate, and triphenyl phosphite.

This product can be used as a polyvinyl chloride light stabilizer. Can give products excellent outdoor anti-aging properties, so it is known as polyvinyl chloride highly effective weathering agent. Adding 2 to 5 parts of this product to polyvinyl chloride film can not only significantly improve its weather resistance and cold resistance, but also reduce the processing temperature by about 10 ° C. In addition, this product can also be used as polyamide, polyurethane, urea resin Excellent solvent for many polymer materials such as phenyl sulfide.

Safety Precautions This product is non-toxic, should not be used in food contact products, and should avoid skin contact.

I. Main uses:

Can effectively absorb ultraviolet light with a wavelength of 270-380 nm, mainly used in polyvinyl chloride, polystyrene, unsaturated resin, polycarbonate, polymethyl methacrylate, polyethylene, ABS resin, epoxy resin and Cellulose resin, etc .; suitable for many fields such as color film, color film, color photo paper, and high molecular polymer; especially suitable for colorless transparent and light-colored products; high-performance ultraviolet absorber for strong absorption .

Outstanding features:

Super strong ultraviolet absorption capacity; effectively prevent ultraviolet damage to the skin and carcinogenicity, greatly improve the anti-aging performance of the product. It hardly absorbs visible light, and is the first choice of UV absorber for colorless transparent and light-colored products; non-flammable, non-corrosive, and good storage stability; good compatibility with a variety of polymers, and has long-lasting anti-oxidant and yellow Variable performance, can be used with common antioxidants; extremely high safety.

3. Physical and chemical indicators:

Appearance: light yellow powder Melting point: 138 ° C-141 ° C Ash: 0.05% Volatile matter: 0.1% Light transmittance: 460nm 95%; 500 nm 97% Solubility: soluble in solvents such as benzene, toluene, styrene, etc. Medium, slightly soluble in ethyl acetate, petroleum ether, insoluble in water

Method of use:

The general dosage is 0.1-0.5% in thin products and 0.05-0.2% in thick products. Adding amount under other process conditions: 0.05-0.3%.