What are Polyethylene Tarps?

The polyethylene polypropylene composite waterproof membrane is developed in accordance with the new requirements of waterproof and anti-seepage materials in modern waterproofing projects in China. The product uses polypropylene non-woven fabrics and polyethylene as the main raw materials and anti-aging agents. High-tech, new technology, new A multi-layered polymer polyethylene polypropylene fiber composite waterproof roll material which is composited by the process.

Polyethylene polypropylene waterproof material

The series of coils are made of multiple layers of different materials, which greatly improves the comprehensiveness of the product, especially the product is provided with an anti-aging layer, which greatly improves the service life of the product. Product design life is more than 50 years. The surface of this product is rough, and the polypropylene non-woven fabric presents an irregular cross structure to form a three-dimensional mesh surface, so the bonding area is large. It can be directly glued to the cement building structure with cement glue, waterproof and anti-seepage, and can also be used in the process of cement solidification. Directly set and built. The cement slurry can directly enter the mesh holes on the surface of the coil material, which is solidified with the cement, so the bonding is permanent and difficult to peel off. The surface of the waterproof layer can be directly decorated and decorated (such as sticky tiles, floor tiles,

The series of coils are widely used in the roofing, walls, toilets, basements, cold storage, bridges, pools, underground pipelines and other projects of various construction structures for waterproofing, seepage prevention, moisture resistance, gas barrier, etc. Anti-rust, anti-corrosion and metallurgy, anti-pollution of chemical industry, anti-seepage and anti-leakage of expressways, underground tunnels and rivers. When applying, the specifications can be selected according to the following table and performance indicators.

Product implementation: GB18173.1-2006 standard

Configuration of cement adhesive: (weight ratio)

1. If the coil is scratched during construction, it should be repaired immediately, pay attention to the placement of construction tools, and damage the waterproof layer.

2. The solidification time of the waterproof layer should not be less than 48 hours.

3. The construction temperature should be controlled between 5C-30C, and it should not be rained within 24 hours after the coil is pasted. If rainy weather occurs during solidification, protective measures should be taken.

4. For construction below 5C in winter, (1) the 801 antifreeze special glue produced by our factory must be used to prevent cement plastic frost from cracking. (2) Frost prevention measures such as covering plastic film and straw curtain must be adopted.

5. Avoid contact with grease and substances that affect the chemical properties of polyethylene.

Polyethylene polypropylene composite waterproofing membrane. For a long time, polyethylene polypropylene waterproofing membrane has been promoted as a universal waterproof material. It can be used on roofs, balconies, terraces, basements, kitchens, bathrooms, pools, etc. due to its low price and process. Simple, so flooded into the construction market. However, these products have major defects in terms of water resistance, durability, ability to adapt to deformation of the base, and reliability in construction applications, especially the number of engineering leakage cases caused by inferior "non-standard" materials. It has become one of the main reasons for the high leakage rate of domestic construction projects.

According to industry sources, polyethylene polypropylene waterproofing membrane is promoted as a universal waterproof material, which can be used on roofs, balconies, terraces, basements, kitchens, bathrooms, pools, etc., because of its low price and simple technology, it is therefore used in the construction market Flooding. However, these products have major defects in terms of water resistance, durability, ability to adapt to deformation of the base, and reliability in construction applications, especially the number of engineering leakage cases caused by inferior "non-standard" materials. It has become one of the main reasons for the high leakage rate of domestic construction projects.

According to relevant regulations, polyethylene polypropylene composite waterproofing membrane cannot meet certain standards and cannot be used for roofing projects and underground waterproofing projects of buildings with fortification requirements. However, the reporter's field visit found that although regular waterproofing engineering companies use SBS modified asphalt waterproofing membranes in roof construction and basement construction, some waterproofing engineering companies are still in order to save costs and reduce the amount of engineering. Use polyethylene polypropylene waterproofing membrane.

According to experts from the China Building Waterproofing Association, polyethylene polypropylene waterproofing membranes are generally thin and therefore have poor penetration resistance. Once sharp sand particles and small stones remain under the waterproof layer, polypropylene waterproofing membranes are easily punctured. Compared with the coating film, it has less elasticity and poor adaptability to complex substrates; compared with SBS modified asphalt coil waterproofing, its heat resistance is slightly worse; and SBS modification that has steadily developed in recent years and occupies a dominant position in waterproof materials Compared with asphalt coils, the construction temperature range of 5 -25 is far less than that of SBS waterproof coils. In addition, polyethylene polypropylene waterproofing membrane is not as plastic as SBS modified asphalt waterproofing membrane. If its thickness is more than 1.0 mm, its flexibility will be reduced, and its construction performance will be reduced. It is difficult to ensure the quality of waterproofing due to detailed node processing. Therefore, experts suggest that it is best to use SBS modified asphalt waterproofing membrane for roof construction and basement construction, so that the quality of waterproof engineering can be guaranteed. ^[1]

Backward products urgently need to limit elimination

As early as 2003, in order to strengthen the production and application management of building waterproof materials, the Ministry of Construction issued the "Opinions on Strengthening the Management of Production and Application of Building Waterproof Materials", requiring construction administrative departments in various places to formulate restrictions, prohibitions, and elimination of backward technologies. With product measures, standardize the production and application of asphalt composite tire waterproof membrane and polyethylene polypropylene composite waterproof membrane products. Asphalt composite tire waterproof membrane is forbidden to use high alkali glass fiber composite tire base, polyethylene polypropylene composite waterproof membrane is prohibited from adopting secondary heating composite molding production process, and the use of polyethylene polypropylene material with film layer below 0.5 mm is restricted. Now more than 10 years have passed. Instead of being restricted and eliminated, polyethylene polypropylene waterproofing membranes have become more and more common in waterproofing projects.

Throughout the international market, authoritative market research institutions and associations in Europe and the United States, such as the British AMI Market Consulting Company and the National Roofing Engineering Association, have covered all the waterproof materials in the Chinese market in their waterproofing material market reports. Data for polyethylene polypropylene as a waterproof material. According to industry experts, in all the professional literature on waterproofing that can be searched, the discussion about polyethylene polypropylene as a waterproofing material cannot be found. In many waterproofing exhibition sites around the world and in the product catalogs of well-known waterproofing companies around the world, no trace of polyethylene polypropylene waterproofing materials can be found.

In China, hundreds of millions of square meters of polyethylene polypropylene waterproofing membrane are flooded every year in construction sites and building materials markets. Roughly estimated, it has occupied more than 30% of the domestic waterproof material market, becoming a global waterproofing market. Wonderful. "

For this reason, industry experts suggest that the scope of use of polyethylene polypropylene waterproofing membranes should be strictly limited, and it should not be used in new construction waterproofing projects that require waterproof grades, and should comply with the general standards for waterproofing materials and waterproofing engineering, and respect scientific testing. Validate conclusions and application practices to completely eliminate such products from standards and specifications.

Relevant standard amendments are on the agenda

According to experts, standards can be divided into national standards, industry standards, local standards, and enterprise standards, but the inversion of domestic waterproof industry standards is widespread and serious. Although the national standard of the waterproof industry is the highest standard, there is a phenomenon that developed regions implement national standards and industry standards, and backward regions implement local standards and enterprise standards. In a sense, local standards and corporate standards are synonymous with "non-standard". The confusion, lag, and lack of normativeness and seriousness of standards are one of the root causes of the chaos in the waterproof industry. It is urgent to revise relevant standards in a timely manner. Restrict the elimination of backward products and technologies, promote large-scale and professional development, and promote the healthy progress of the waterproof industry

In order to eradicate the chaos in the market, relevant departments and localities have issued regulations on restricting and banning the use of polyethylene polypropylene waterproofing materials. In 2015, the Ministry of Industry and Information Technology issued the "Access Conditions for Construction Waterproof Coil Industry (Consultation Draft)", and also issued the "Interim Measures for the Management of Construction Waterproof Coil Industry Admission Announcement (Consultation Draft)".

According to the above opinion draft, the single-line production capacity of new and remodeled and expanded modified asphalt (including self-adhesive) waterproof membrane projects is not less than 10 million square meters per year; the single-line capacity of polymer waterproof membrane (PVC, TPO) projects is not large. Less than 3 million square meters per year. If these entry conditions are put into production before the implementation of the production conditions and a production license is obtained, if the entry conditions are not met, they should be rectified within a time limit and must be achieved before the license is changed. It is strictly forbidden to newly build or rebuild polyethylene polypropylene fiber composite waterproofing membrane, chlorinated polyethylene waterproofing membrane, petroleum asphalt paper tire linoleum, asphalt composite tire flexible waterproof membrane project, and gradually phase out asphalt composite tire flexible waterproof membrane. ^[2]

The Hebei Provincial Department of Housing and Urban-Rural Development has compiled and released the promotion of advanced building materials and equipment, restricting and banning the use of backward products and technologies, further improving the application level of Hebei's green and environmentally friendly building materials and equipment in construction projects, and promoting the structural adjustment and industrial upgrading of the building materials and equipment industry. "Promotion, Restriction and Prohibition of the Use of Construction Engineering Materials and Equipment Product Catalog in Hebei Province (2015 Edition)", S-type polyethylene polypropylene waterproofing membrane and polyethylene polypropylene composite waterproofing membrane with a core thickness of less than 0.5 mm are explicitly included in the prohibition of use class. [2]

According to statistics, 65% of domestic new houses will have different degrees of leakage within one to two years. Leakage accounts for 65% of real estate quality complaints, and another 65% of building waterproofing projects need to be refurbished after 6 to 8 years. These three "65%" are enough to confirm the universality of building leakage and strike directly at the people's pain.

In the construction waterproofing industry, polyethylene polypropylene waterproofing membranes are tingling insiders from time to time. Because in the industry's opinion, regardless of material properties or reliability of construction applications, there are major flaws, but they account for 30% of the domestic waterproof material market.

At present, polyethylene polypropylene fiber membranes are being tortured by composite waterproofing. "Reliable" has been introduced in relevant places. Dozens of brand companies have shown them the "restricted" brand, suggesting that relevant departments strictly restrict Its scope of use.

Product: "Wonderful" in the waterproof market

Polyethylene polypropylene waterproofing membrane is mainly composed of polyethylene film and polypropylene fiber. Polypropylene fiber is a common raw material for non-woven fabrics on the market; polyethylene film is a plastic film, and even many polyethylene films are waste films recycled from farmers' markets. The membrane is a modification of the geomembrane. It was originally used in water conservancy for imperviousness. Later, a composite impervious membrane appeared and it was improved into a polyethylene polypropylene composite waterproof membrane.

Seniors in the waterproofing industry have used "waterproof materials with very different quality grades" to describe polyethylene polypropylene waterproofing membranes. It is understood that there are not a few companies in the industry that produce polyethylene polypropylene waterproofing membranes, but most of them are very small enterprises with low entry investment, and a production line can be equipped with 20,000 to 300,000 yuan.

It is worth noting that polyethylene polypropylene is used as a waterproof material, which is unique in the world.

The British AMI market consulting company and the American National Roofing Engineering Association are authoritative market research institutions in Europe and the United States. In the waterproof material market report data issued by them over the years, they have covered all the major waterproof materials and most other waterproof materials in the Chinese market. Data of ethylene polypropylene used as waterproof material.

In the relevant literature on waterproofing that can be searched, the discussion about polyethylene polypropylene as a waterproofing material cannot be found. Many polypropylene waterproofing materials could not be found in many waterproof exhibition sites around the world and in the product catalogs of well-known global waterproofing companies.

Insiders pointed out that in China, hundreds of millions of square meters of polyethylene polypropylene fiber waterproofing membrane floods construction sites and building materials markets throughout the country, becoming a wonderful work in the global waterproofing market. ^[3]

The use of raw materials directly affects the quality of polyethylene polypropylene waterproofing membrane.

"Why so many people oppose the use of polyethylene polypropylene waterproofing membranes. One of the important reasons is that many small manufacturers and small workshops use polyethylene recycled materials to make polyethylene polypropylene waterproofing membranes, which has affected the service life of this material. "An industry source who asked not to be named said.

In 2015, under the supervision of the Notary Public Office, a media launched the 2015 Waterproof Coil Commodity Quality Consumption Testing Activity, which randomly purchased more than 20 brands of waterproofing membranes from the building materials market and sent them to a professional testing center for testing. The results show that the qualified rate of polyethylene polypropylene waterproofing membrane is only 10%.

At present, a large number of fake and inferior polyethylene polypropylene composite waterproof coils appear on the market, and the recycled materials are used for hot-pressing compounding, and the prices of recycled materials and raw materials differ by 2 to 3 times. Taking a 0.7mm thick polyethylene polypropylene waterproofing membrane as an example, the genuine price is more than 20 yuan, while the inferior product is only sold for 3 to 4 yuan, disrupting the normal market order and bringing hidden dangers to the building.

In terms of product performance, the polyethylene film has poor heat resistance, and it is prone to permanent deformation above 80 ° C, which causes the coil and the base layer to peel off. In addition, the polyethylene film has poor aging resistance. In the exposed environment, it will become brittle in one month, worse or even powder, and it is difficult to waterproof. Even if there is a protective layer or basement, the aging performance cannot guarantee the design life.

Application: Composite waterproof system is "unreliable"

After the emergence of polyethylene polypropylene waterproofing membrane, there have been two different sounds in the industry. One is support, the product can be used as a waterproof membrane; the other is against, thinking that the product does not meet the requirements of building waterproofing in many aspects.

At present, a viewpoint in the industry is gradually gaining the upper hand: polyethylene film can indeed play a role in blocking water in a static environment, but it is not suitable for use as a building waterproof material. [2]

From 2014 to July 2015, in order to deal with the problem of waterproofing of buildings in Hainan, the Hainan Provincial Building Standard Quota Station worked with relevant units to compile the "Technical Regulations of Hainan Building Waterproof Engineering". The "Specifications" clearly pointed out that one of the main problems of Hainan's inadequate waterproofing is that the design and construction personnel wrongly chose polyethylene polypropylene as the waterproof material.

Industry experts said that during the construction and installation of polyethylene polypropylene waterproofing membrane, only cement adhesive method can be used. The waterproof layer constructed by this method is extremely unreliable during the operation of the construction project, which is mainly manifested in the unreliability of overlap and detailed processing.

Taking detailed processing as an example, the cement bonding method is more difficult to work in the complex detailed node parts such as the pipe root, the downfall, and the yin and yang corners of construction projects, and these parts are most prone to leakage and are the most important part of waterproofing .

Qu Hui, secretary general of the Building Waterproofing Branch of the China Construction Industry Association, said in an interview with the media that the use of cement glue to lap polyethylene polypropylene waterproofing membranes is not a problem. The key lies in the overlapping edges.

In the opinion of some industry experts, "composite waterproofing system" is the main excuse for polyethylene polypropylene waterproofing membrane to circumvent the national standard universal standard. The so-called composite waterproof system uses cement glue as a waterproof layer, and "composites" with coils instead of "two" flexible waterproof layers fortification. This is a far-fetched idea.

First of all, the impermeability of cement glue cannot meet the requirements of a waterproof layer. Even cement glue with modifiers is a rigid waterproof layer at best, which cannot be confused with a flexible waterproof layer. The cement glue in the polyethylene polypropylene fiber composite waterproofing system does not follow the construction specifications of the rigid waterproof layer at all, nor has it been tested according to the standard of a waterproof material.

It is extremely important that the bonding of cement glue to polyethylene polypropylene is pseudo-adhesive, which can easily cause the waterproof layer to crack, delaminate and fall off and fail.

Insiders said that, from the perspective of material properties and application properties, polyethylene polypropylene is not suitable for use as a waterproof material, and can only be used as a moisture-proof layer, a cushion layer or a curing material. The reason why it occupies about 30% of the domestic market is mainly two points: first, the cost is low and it meets the needs of the inferior engineering construction market; second, some standards and specifications still have loopholes and defects.

Well-known building waterproofing expert Professor Ye Linchang once said that the existing waterproofing standards and specifications still lack scientific and operability. For example, Article 3.1.4 of "Technical Specifications for Waterproofing of Underground Engineering" stipulates that the main structure of the waterfront of underground engineering shall adopt waterproof concrete, and other waterproofing measures shall be adopted according to the requirements of the waterproof rating. In "Other waterproofing measures", six types of waterproof materials are listed, including coils and coatings. At the same time, relevant requirements for the thickness of different types of materials are put forward.

Ye Linchang believes that although the material properties of these available materials meet the specifications, their engineering effects are not consistent. In 1994, he instructed researchers to conduct comparative tests on impact resistance and impermeability of flexible waterproof materials of different thicknesses and varieties. The results show that their performance varies greatly.

On the surface, polyethylene polypropylene waterproofing membrane is affordable, but it is estimated that the direct economic loss caused by its flooding will cause dozens of times the sum of the saved construction costs and the enterprise's income, and will give the building structure safety Continuing threats. ^[4]

Policy: Restrictions and Bans Pushing It Out

For several years, the voice on restricting and banning polyethylene polypropylene waterproofing membranes has never stopped. The relevant regulations of the housing construction sector have also squeezed its market space, accelerating its "out" from the building waterproofing market.

As early as March 2004, the Ministry of Construction issued the "Promotion and Application of Prohibited Technologies by the Ministry of Construction", which clearly stipulates the use of polyethylene polypropylene composite waterproofing membranes: polyethylene polypropylene and other composite waterproofing produced by the secondary heating composite molding process. Coiled material is forbidden to be used for waterproofing of house construction. Composite waterproofing membranes such as polyethylene polypropylene with a polyethylene film thickness of 0.5mm or less shall not be used for roofing projects and underground waterproofing projects of house construction.

In the Catalogue of Building Materials Promoted, Restricted, and Prohibited in Beijing (2014 Edition), polyethylene polypropylene composite waterproofing membranes with a core material thickness of less than 0.5mm are listed as prohibited construction materials because of the product's aging resistance Poor, poor waterproof. Since October 1, 2015, Hebei Province has made the same "prohibition" provisions as Beijing.

For polyethylene polypropylene (polyester) waterproofing membrane, Chuzhou City, Sichuan Province, and Chifeng City, Inner Mongolia are also prohibited from using it in basements, roofs, kitchens and other important waterproof parts. ^[5]