Polyethylene polypropylene composite waterproofing roll is developed according to the new requirements of China's modern waterproofing projects for waterproof and anti-seepage materials. The product uses polypropylene non-woven fabrics and polyethylene as the main raw materials, and is compounded with anti-aging agents, using high-tech, new technologies, and new processes to form a multi-layered high-molecular polyethylene polypropylene composite waterproofing roll material.

Product Introduction

The advent of polyethylene polypropylene waterproofing materials has completely changed the problem of the historical construction industry that the cement base is wet and the water content is high and cannot be constructed. It can be directly bonded to the cement structure surface. The product has excellent waterproof performance, is non-toxic, odorless, has high tensile strength, strong anti-seepage ability, is frost-resistant, corrosion-resistant, easy to paste, has good flexibility, is light in weight, is easy to operate, does not require fire, does not require oil, and has no noise during construction. It is an ideal green and environmentally friendly product in the new century. Polyethylene polypropylene roll is a patented product of Harbin High-Tech Suileng Second Plastic Co., Ltd. (patent number: 89108466.5).

Features of use

The series of coils are made of multiple layers of different materials, which significantly improves the comprehensiveness of the product. In particular, the product is equipped with an anti-aging layer, which greatly increases the service life of the product. The product design life is more than 50 years. The surface of the 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 pasted on the cement building structure with cement glue, which is waterproof and anti-seepage. It can also be directly set and sandwiched during the cement solidification process. Cement slurry can directly enter the mesh on the surface of the coil and solidify with the cement, so the bonding is permanent and firm and not easy to peel off. The surface of the waterproof layer can be directly decorated and renovated (such as sticking tiles, floor tiles, mosaics, applying cement slurry, etc.). Especially for underground waterproofing projects, there are no special requirements for the moisture content of the leveling layer (base layer). As long as there is no water, the construction can be carried out. There are no special requirements for sanitary corners. Arcs and right angles are all OK, and the construction quality is reliable.

Application scope

The series of coils are widely used in waterproofing, anti-seepage, moisture-proofing, and air-proofing of roofs, walls, toilets and bathrooms, basements, cold storages, bridges, pools, underground pipelines and other projects of various building structures. It can also be used for rust prevention, anti-corrosion, metallurgy, chemical pollution prevention, highways, underground tunnels, and river seepage prevention and leakage prevention. When applying, the specifications can be selected according to the following table and performance indicators.

Performance indicators

Product implementation: GB18173.1-2006 standard cement adhesive configuration: (weight ratio) cement (425# silicate cement): 801 glue: water ratio is 1:0.25:0.5; (volume ratio) 801 glue 1: water 3: cement 6. When preparing, first add water and 801 glue into the container and stir to melt. Then add cement and stir until there is no clot or precipitation. The prepared cement glue adhesive should be used up within 4 hours, and water should be added and adjusted at any time according to the situation.

Precautions

1. If there is a scratch on the roll during construction, it should be repaired immediately. Pay attention to the placement of construction tools and prevent water from damaging the waterproof layer.

2. The curing time of the waterproof layer shall not be less than 48 hours.

3. The construction temperature should be between 5C-30C. The roll should not be exposed to rain within 24 hours after pasting. If it rains during the curing period, protective measures should be taken.

4. When constructing in winter below 5C, (1) the 801 antifreeze special glue produced by our factory must be used to prevent the cement slurry from freezing and cracking. (2) Antifreeze measures such as covering with plastic film and straw mats must be adopted.

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

Construction hazards

Polyethylene polypropylene composite waterproofing membrane, for a long time, polyethylene polypropylene waterproofing membrane has been promoted as a universal waterproofing material, which can be used in roofs, balconies, terraces, basements, kitchens, pools, etc., because of its low price and simple process, it has flooded the construction market. However, this type of product has major defects in terms of water resistance, durability, ability to adapt to base deformation, and reliability of construction applications. In particular, there are countless cases of engineering leakage caused by inferior "non-standard" materials, which has become one of the main reasons for the high leakage rate of Chinese construction projects.

According to industry insiders, polyethylene polypropylene waterproofing membrane has been promoted as a universal waterproofing material, which can be used in roofs, balconies, terraces, basements, kitchens, pools, etc., because of its low price and simple process, it has flooded the construction market. However, this type of product has major defects in terms of water resistance, durability, ability to adapt to base deformation, and reliability of construction applications. In particular, there are countless cases of engineering leakage caused by inferior "non-standard" materials, which has become one of the main reasons for the high leakage rate of Chinese construction projects.

According to relevant regulations, polyethylene polypropylene composite waterproofing membranes cannot be used in roofing projects and underground waterproofing projects of houses with defense grade requirements if they do not meet certain standards. However, the reporter found in a field visit that although regular waterproofing engineering companies use SBS modified asphalt waterproofing membranes in roofing and basement construction, some waterproofing engineering companies are still using polyethylene polypropylene waterproofing membranes in order to save costs and reduce the amount of work.

Experts from the China Building Waterproof Association said that polyethylene polypropylene waterproofing membranes are generally thinner and therefore have poor penetration resistance. Once sharp sand and pebbles are left under the waterproof layer, polypropylene waterproofing membranes can be easily pierced. Compared with the coating, it has less elasticity and poor adaptability to complex bases; compared with SBS modified asphalt waterproofing membrane, its heat resistance is slightly worse; compared with SBS modified asphalt waterproofing membrane, which has been steadily developing in recent years and has occupied a dominant position in waterproofing materials, its construction temperature range of 5¡æ-25¡æ is far less than the wide application range of SBS waterproofing membrane. In addition, polyethylene polypropylene waterproofing membrane is not as plastic as SBS modified asphalt waterproofing membrane. When its thickness is above 1.0 mm, its flexibility will decrease, construction performance will be reduced, and it is difficult to ensure the waterproofing quality when processing detailed nodes. 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 such waterproofing projects can be guaranteed.

Outdated products need to be restricted and eliminated urgently

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 Production and Application Management of Building Waterproof Materials", requiring local construction administrative departments to formulate measures to restrict, prohibit and eliminate backward technologies and products, and standardize the production and application of asphalt composite tire waterproof membranes and polyethylene polypropylene composite waterproof membranes. Asphalt composite tire waterproof membranes are prohibited from using high-alkali glass fiber composite tire bases, and polyethylene polypropylene composite waterproof membranes are prohibited from using secondary heating composite molding production processes, and the use of polyethylene polypropylene materials with a membrane layer below 0.5 mm is restricted. Now more than 10 years have passed, and polyethylene polypropylene waterproof membranes have not been restricted or eliminated, but have become more and more commonly used in waterproof projects.

Looking at 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 of the United States, have covered all waterproof materials in the Chinese market in their waterproof material market reports issued over the years, but there is no data on polyethylene polypropylene used as waterproof materials. According to industry experts, in all the relevant waterproofing professional literature that can be searched at present, there is no discussion about the use of polyethylene polypropylene as a waterproofing material. There is no trace of polyethylene polypropylene waterproofing materials at many waterproofing exhibitions around the world and in the product catalogs of world-renowned waterproofing companies.

In China, hundreds of millions of square meters of polyethylene polypropylene waterproofing membranes are flooded in construction sites and building materials markets everywhere every year. It is roughly estimated that it has occupied more than 30% of the Chinese waterproofing material market, becoming a "wonderful flower" in the global waterproofing market.

For this reason, industry experts suggest that the scope of use of polyethylene polypropylene waterproofing membranes should be strictly limited, requiring them not to be used in new building waterproofing projects with waterproofing grade requirements, and complying with the general standards for waterproofing materials and waterproofing projects, respecting scientific test verification conclusions and application practices, and completely eliminating such products from standards and specifications.

The revision of relevant standards has been put on the agenda

According to experts, standards can be divided into national standards, industry standards, local standards and enterprise standards, but the inversion of standards in China's waterproofing industry is common and serious. Although the national standard of the waterproofing industry is the highest standard, there is a phenomenon that developed regions implement national standards and industry standards, while backward regions implement local standards and enterprise standards. In a sense, local standards and enterprise standards are synonymous with "non-standard". The confusion, lag, and lack of standardization and seriousness of standards are one of the root causes of the chaos in the waterproofing industry. It is urgent to revise relevant standards in a timely manner to limit the elimination of backward products and technologies, promote large-scale and professional development, and promote the healthy development of the waterproofing industry. In order to cure the market chaos, relevant departments and localities have issued regulations on restricting and prohibiting the use of polyethylene polypropylene waterproof materials. In 2015, the Ministry of Industry and Information Technology issued the "Conditions for Access to the Building Waterproofing Membrane Industry (Draft for Comments)" and also issued the "Interim Measures for the Administration of Access Announcements to the Building Waterproofing Membrane Industry (Draft for Comments)".

According to the above draft opinion, the single-line production capacity of newly built and expanded modified asphalt (including self-adhesive) waterproofing membrane projects shall not be less than 10 million square meters/year; the single-line production capacity of polymer waterproofing membrane (PVC, TPO) projects shall not be less than 3 million square meters/year. For those who have been put into production and obtained production licenses before the implementation of this access condition, if they fail to meet the requirements of this access condition, they should make rectifications within a time limit, and must meet them before renewing the license. It is strictly prohibited to newly build and expand polyethylene polypropylene composite waterproofing membrane, chlorinated polyethylene waterproofing membrane, petroleum asphalt paper tire felt, and asphalt composite tire flexible waterproofing membrane projects, and asphalt composite tire flexible waterproofing membranes shall be gradually eliminated.

In order to promote advanced building materials and equipment, restrict and prohibit the use of backward products and technologies, further improve the application level of Hebei green and environmentally friendly building materials and equipment in construction projects, and promote the structural adjustment and industrial upgrading of the building materials and equipment industry, the Hebei Provincial Department of Housing and Urban-Rural Development compiled and issued the "Catalogue of Construction Engineering Materials and Equipment Products Promoted, Restricted and Prohibited in Hebei Province (2015 Edition)", and S-type polyethylene polypropylene waterproofing membranes and polyethylene polypropylene composite waterproofing membranes with a core thickness of less than 0.5 mm were clearly included in the prohibited use category.

According to statistics, 65% of new houses in China will have varying degrees of leakage within one to two years, and leakage accounts for 65% of real estate quality complaints. Another 65% of building waterproofing projects need to be renovated after 6 to 8 years. These three "65%" are enough to prove the universality of building leakage and directly hit the pain points of people's living.

In the building waterproofing industry, polyethylene polypropylene waterproofing membranes often sting people in the industry. Because in the eyes of industry insiders, it has major defects in both material properties and reliability of construction applications, but it occupies 30% of the Chinese waterproof material market.

At present, polyethylene polypropylene membrane is facing the question of "unreliability" of composite waterproofing. Relevant places have introduced regulations to restrict or prohibit its use. Dozens of brand companies have shown it the "restriction" card, suggesting that relevant departments strictly limit its scope of use.

Product: "Strange" in the waterproofing market

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

Veterans in the waterproofing industry once used "waterproof materials with very different quality grades" to describe polyethylene polypropylene waterproofing membrane. It is understood that there are quite a few companies in the industry that produce polyethylene polypropylene waterproofing membranes, but most of them are very small companies with very low entry investment. A production line can be equipped with 200,000 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 National Roofing Engineering Association of the United States are authoritative market research institutions in Europe and the United States. In the waterproof material market report data issued by them over the years, all major waterproof materials and most other waterproof materials in the Chinese market are involved, but there is no data on polyethylene polypropylene used as a waterproof material.

In the relevant literature on waterproofing that can be searched, no discussion on the use of polyethylene polypropylene as a waterproof material can be found. There is no trace of polyethylene polypropylene waterproofing materials at many waterproofing exhibitions around the world, nor in the product catalogs of world-renowned waterproofing companies.

Industry insiders pointed out that in China, hundreds of millions of square meters of polyethylene polypropylene waterproofing membranes are flooded in construction sites and building materials markets across the country every year, becoming a wonder in the global waterproofing market.

Whether to use virgin materials directly affects the quality of polyethylene polypropylene waterproofing membranes.

"Why are there so many people against the use of polyethylene polypropylene waterproofing membranes? One of the important reasons is that many small manufacturers and workshops use polyethylene recycled materials to make polyethylene polypropylene waterproofing membranes, which affects the service life of the material." said an industry insider who did not want to be named.

In 2015, under the full supervision and notarization of the notary office, some media carried out the "2015 Waterproof Membrane Commodity Quality Consumer Test Activity", randomly purchasing waterproof membranes of more than 20 brands from the building materials market and sending them to professional testing centers for testing. The results showed that the qualified rate of polyethylene polypropylene waterproofing membranes was only 10%.

At present, a large number of counterfeit and fake polyethylene polypropylene composite waterproofing membranes appearing on the market use recycled materials for hot pressing and compounding, and the price of recycled materials and virgin materials differs by 2 to 3 times. Taking 0.7mm thick polyethylene polypropylene waterproofing membranes as an example, the price of genuine products is more than 20 yuan, while inferior products are only sold for 3 to 4 yuan, disrupting the normal market order and bringing leakage risks to buildings.

From the product performance point of view, polyethylene film has poor heat resistance, and it is easy to deform permanently when it exceeds 80¡æ, resulting in the peeling of the membrane and the base. In addition, polyethylene film has poor aging resistance. In an exposed environment, it will become brittle in one month, and the poor ones will even become powdery, making it difficult to waterproof. Even with a protective layer or basement, the aging performance cannot guarantee the designed service life.

Application: Composite waterproofing system is "unreliable"

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

At present, a view in the industry is gradually gaining the upper hand: polyethylene membrane can indeed play a role in blocking water in a static environment, but it is not suitable for use as a building waterproofing material.

Between 2014 and July 2015, in order to address the problem of building waterproofing in Hainan, the Hainan Provincial Building Standard and Quota Station jointly compiled the "Technical Regulations for Building Waterproofing Engineering in Hainan Province" with relevant units. The "Regulations" clearly pointed out that one of the main problems of inadequate waterproofing of Hainan buildings is that designers and construction personnel mistakenly chose polyethylene polypropylene as a waterproof material.

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

Take detail processing as an example. In the complex structural detail nodes such as pipe roots, downspouts, and corners of construction projects, cement adhesive methods are more difficult to work. These parts are most prone to leakage and are the top priority 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 there is no problem with overlapping polyethylene polypropylene waterproofing membranes with cement glue. The key lies in the overlap edge, which needs to play to its strengths and avoid its weaknesses and improve the construction process.

In the view of some industry experts, "composite waterproofing system" is the main excuse for polyethylene polypropylene waterproofing membranes to circumvent the general national standards. The so-called composite waterproof system uses cement glue as a waterproof layer and "compounds" it with the membrane to replace "two" flexible waterproof layers. This is completely far-fetched.

First of all, the anti-seepage performance of cement glue cannot meet the requirements of being a waterproof layer. Even if the cement glue with modifier is added, it is at best a rigid waterproof layer and cannot be confused with a flexible waterproof layer. The cement glue in the polyethylene polypropylene composite waterproofing system does not follow the construction specifications of the rigid waterproof layer at all, nor is it tested according to the standards of a waterproof material.

It is extremely important that the bonding between cement glue and polyethylene polypropylene is a false bond, which can easily lead to cracking, delamination and shedding of the waterproof layer and cause it to fail.

Industry insiders said that polyethylene polypropylene is not suitable for use as a waterproof material in terms of both material performance and application performance, and can only be used as a moisture-proof layer, cushion or maintenance material. The reason why it occupies about 30% of the market in China is mainly due to two points: one is that it is low-cost and caters to the needs of the inferior engineering construction market; the other is that some standards and specifications still have loopholes and defects.

Professor Ye Linchang, a well-known building waterproofing expert, once said that the existing waterproofing standards and specifications still lack scientificity and operability. For example, Article 3.1.4 of the "Technical Specifications for Waterproofing of Underground Engineering" stipulates that the main structure of the water-facing surface of underground engineering should use waterproof concrete, and other waterproofing measures should be taken according to the requirements of the waterproofing grade. In the "other waterproofing measures", six kinds of waterproof materials such as coils and coatings are listed for selection, and relevant requirements are put forward for the thickness of different types of materials.

Ye Linchang believes that although the material properties of these materials for selection meet the requirements of the specifications, their engineering effects are not consistent. In 1994, he guided scientific researchers to conduct comparative tests on impact resistance and impermeability of flexible waterproof materials of different thicknesses and varieties. The results showed that their performances vary greatly.

On the surface, polyethylene polypropylene waterproofing coils are affordable, but it is estimated that the direct economic losses caused by its flooding and leakage will be dozens of times the total saved construction costs and corporate income, and will pose a continuous threat to the safety of building structures.

Policy: Restrictions and bans push it out

For several years, the voices about restricting and banning polyethylene polypropylene waterproofing coils have never stopped. The relevant regulations of the housing and construction departments have also squeezed its market space, accelerating its "exit" from the building waterproofing market.

As early as March 2004, the Ministry of Construction issued the "Technology Promoted, Applied and Restricted by the Ministry of Construction", which made clear provisions on the use of polyethylene polypropylene composite waterproofing membranes: Polyethylene polypropylene and other composite waterproofing membranes produced by the secondary heating composite molding process are prohibited from being used in waterproofing projects for housing construction. Polyethylene polypropylene and other composite waterproofing membranes with a polyethylene film thickness of less than 0.5mm shall not be used in roofing projects and underground waterproofing projects for housing 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 building materials because the product has poor aging resistance and poor waterproofing function. Since October 1, 2015, Hebei Province has also made the same "prohibition" regulations as Beijing.

For polyethylene polypropylene (polyester) waterproofing membranes, Luzhou City, Sichuan Province and Chifeng City, Inner Mongolia also prohibit their use in important waterproofing areas such as basements, roofs, kitchens and bathrooms.

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