Recently, an opinion was circulated on the Internet and WeChat. Some people think that 'polyethylene-polypropylene waterproofing membranes have major defects in terms of material properties and construction application reliability, and are not suitable for use as a waterproof material. The person even believes that the polyethylene polypropylene waterproof roll products should be completely eliminated from the standards and specifications. This view triggered a hot debate in the industry.
What kind of product is Polypropylene Polypropylene waterproofing membrane in the end? Should it be eliminated? How should one treat the waterproof material correctly? Recently I consulted the relevant persons in the waterproofing industry and listened to their waterproofing of Polyethylene Polypropylene. Material related views.
'I think it is unscientific to simply affirm or deny certain types of waterproof materials because everything is complicated. From the perspective of dialectics, things have a good side and a bad side. To look at it separately, it depends on where it is used, how it is used, who uses it, and who uses it. 'Yang Lin's slogans, the deputy director of the Expert Committee of the China Construction Engineering Association's Waterproof Technology Committee, said with earnest attention.
Ye Linbiao is a master class expert in the waterproof industry in China. He has dealt with construction waterproofing for more than half a century, and countless in-depth engineering sites. The Beijing Construction Engineering Research Institute’s Architectural Engineering Quality Judicial Identification Center, where he is located, has many cases of judiciary appraisal due to housing leakage caused by disputes and accountability.
Ye Linbiao said that from the engineering cases and forensic case cases that he had contacted, no waterproof material would be necessary. Which kind of waterproof material would not work. Like SBS modified bitumen waterproofing membranes with the largest amount of application in the waterproof industry, some manufacturers have incorporated a large amount of waste rubber powder into their raw materials to reduce costs, resulting in poor material properties, or insufficiency in hot melt welding of SBS modified bituminous waterproofing membranes. There are also many cases of disputes caused by leakage. Polypropylene waterproofing materials produced from polyethylene raw materials also have many good engineering cases. For example, some subway projects and basement projects have not leaked for more than 10 years.
The overlap between polyethylene-polypropylene waterproofing membranes is generally achieved through the bonding of polymer cement binders with polypropylene or polyester fibers. This lap-joint construction method has been criticized by a number of professionals because of the differences between different materials. Lap, and not sealed waterproof edge.
In this regard, the Secretary-General of the Construction Water Association of China Construction Association, Qu Hui, said that the use of cement adhesive lap polyethylene polypropylene waterproof membrane, no problem on the large-surface paving, the key lies in the lap, need to avoid weaknesses, improve the construction process.
According to Qu Hui, the composite waterproof construction technology of polyethylene polypropylene waterproofing membrane and non-cured waterproof binder was included in the ten new technologies promoted and applied by the Ministry of Housing and Urban-Rural Development in 2014. The use of non-cured waterproof binders compensates for the inherent deficiencies of polyethylene polypropylene membranes. She also emphasized that in order to achieve a good waterproof effect, polyethylene-polypropylene composite waterproofing membrane products must pay attention to the overall waterproof performance of the structure during the construction process, instead of stressing the water-infiltration resistance of the waterproofing membrane body material alone.
Qu Hui further explained that at present, many projects use two layers of polyethylene polypropylene waterproof membranes, and they are lapped at the wrong seam (1/2 or 1/3), which is more secure. In the entire waterproofing system, the layer structure plays a role in blocking the leakage of water.
Qu Hui said that polyethylene is a plastic material that can be restored by heat deformation in the 80°C range. The waterproof layer will not exceed this temperature. And most of the waterproof layer will have a protective layer outside, polyethylene polypropylene waterproof membrane will not be exposed to use, will not be exposed to ultraviolet light, will not affect its anti-aging properties.
'Why there are so many people opposed to the use of polyethylene polypropylene waterproofing membranes, one of the important reasons is that there are many small manufacturers, small workshops made of polyethylene recycled polyethylene polypropylene waterproof material, affecting the useful life of the material. In Shandong, Hebei, and other places, some traders made foreign waste of polyethylene into 'N' grades of polyethylene and sold them to workshops in Liaoyang, Liaoning Province and other places. The polyethylene-polypropylene waterproofing membranes produced there only sell three or four yuan per square meter, which does not provide a waterproof effect at all, and has a great impact on the industry. One industry source, who did not want to be named, said so.
'Polypropylene-polypropylene-polypropylene composite waterproofing membrane must use genuine polyethylene pellets' raw material and be compounded by one-time hot pressing. At present, a large number of counterfeit and fake polyethylene polypropylene composite waterproofing membranes on the market are used for hot pressing and compounding using recycled materials. The price difference between recycled materials and genuine raw materials is 2 to 3 times. On the market, the price of 0.7mm thick polyethylene polypropylene composite waterproofing membrane is above 20 yuan, while the poor quality polyethylene polypropylene composite waterproofing membrane is only sold for 3-4 yuan, which not only disturbs the normal market order and brings to the building. Leakage hidden, but also caused misunderstanding, people think that polyethylene polypropylene composite waterproof membrane quality is poor, leading some experts even suggested that the polyethylene polypropylene composite waterproof membrane. Du Fu, chairman of Beijing Holy Waterproof Material Co., Ltd. complained to the author.
Du Fu said that the real high-molecular polyethylene polypropylene composite waterproofing membrane material should be a regular petrochemical manufacturer's linear low-density polyethylene pellet raw material, pure transparent white and regular flat round particles. The recycled raw materials purchased by non-regular manufacturers are long round shapes with a very confusing colour and coarse particles. Polypropylene waterproofing membrane cores produced with genuine raw materials are transparent and cannot be torn off by hand. However, the poor quality recycled polyethylene polypropylene waterproofing membranes are gray, hard and brittle. Use force to tear open.
According to industry sources, whether or not to use raw materials has become a 'watershed' for product quality of polyethylene polypropylene waterproof coils.
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