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Polyethylene polypropylene waterproof coiled material sinks into the questioning vortex

polyethylene polypropylene waterproof coiled material sinks into the questioning vortex

January 21, 2015

[China paint information] recently, there is a view in the upper and upper circles. Some people believe that "polyethylene polypropylene waterproof coiled material has major defects in terms of material properties and reliability of construction application, and is not suitable for use as a waterproof material." This person even believes that the experimental results can be saved automatically, and the polyethylene polypropylene waterproof roll products should be completely eliminated from the standards and specifications. Opinions came out and won the agreement of many people

what kind of product is polyethylene polypropylene waterproof coiled material? Should it be eliminated? How should we treat a waterproof material correctly? Recently, I interviewed relevant people in the waterproof industry and listened to their views on polyethylene polypropylene waterproof coiled materials

I think it is unscientific to simply affirm or deny a certain kind of waterproof material, because everything is very complex. Dialectically speaking, things have good and bad aspects. We should look at them separately. We should look at their main aspects, where they are used, how they are used, and who uses them. "

-- ye LinBiao, vice chairman of the expert committee of the waterproof technology committee of the Chinese Architectural Society, is a leading expert in the waterproof industry in China. He has dealt with building waterproofing for more than half a century and has gone deep into countless engineering sites. The judicial appraisal center of construction engineering quality of Beijing Construction Engineering Research Institute, where he works, has many cases of judicial appraisal due to disputes and accountability caused by housing leakage every year

ye LinBiao said that from the engineering cases and judicial expertise cases he came into contact with, it is certain that no waterproof material will work and no waterproof material will work. For example, SBS modified asphalt waterproof coiled material, which is the most widely used in the waterproof industry, some manufacturers add a large amount of waste rubber powder to their raw materials to reduce costs, resulting in poor material performance, or SBS modified asphalt waterproof coiled material hot melting. Generally speaking, there are many cases of disputes caused by leakage caused by inadequate welding. There are also many good engineering cases of polyethylene polypropylene waterproof materials produced with polyethylene raw materials, such as some subway projects and basement projects. There has been no leakage for more than ten years

in ye LinBiao's view, as long as the materials are genuine and pay attention to product quality, even if there are slight defects in material performance, they can also be made up by the system. And those products with good material performance, if they sell dog meat with sheep's head, they are just illusory. The market is the best touchstone. Waterproof materials can slowly eliminate themselves. It is not advisable to completely eliminate polyethylene polypropylene waterproof roll products with standards and specifications

the lapping between polyethylene and polypropylene waterproof rolls is generally achieved by bonding polymer cement binder with polypropylene or polyester fiber. This lapping construction method is criticized by some professionals because it belongs to the lapping between different materials, and it is not closed waterproof edge banding

lap the polyethylene polypropylene waterproof membrane with cement glue, and there is no problem in paving the large surface. The key lies in the lap edge, which needs to develop strengths and avoid weaknesses, and improve the construction process

-- Qu Hui, Secretary General of the building waterproofing branch of China Construction Industry Association, told that the composite waterproof construction technology of polyethylene polypropylene waterproof roll and non curing 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 curing waterproof binder makes up for the congenital deficiency in the overlapping of polyethylene polypropylene waterproof coiled materials. She also stressed that in order to achieve a good waterproof effect, polyethylene polypropylene composite waterproof coiled material products must pay attention to the overall waterproof efficiency of the structure in the construction process, rather than emphasizing the separate ability of waterproof coiled material to prevent water penetration

Qu Hui further explained that at present, many projects use two layers of polyethylene polypropylene waterproof rolls, with staggered seams (1/2 or 1/3) overlapping, which is more safe. In the whole waterproof system, the layer by layer structure plays a blocking role in water leakage

in response to the argument put forward by someone that "polyethylene film has poor heat resistance and aging resistance, and is not suitable for building waterproof Engineering". 5. Special fixtures are needed in special industries. Qu Hui said that polyethylene should be removed first. The lower protection is a plastic material, which can be recovered by heat deformation within the range of 80 degrees Celsius, and the waterproof layer generally will not exceed this temperature. And the vast majority of waterproof layers will have protective layers outside. Polyethylene polypropylene waterproof rolls will not be exposed for use, will not be exposed to ultraviolet light, and will not affect their aging resistance

"Why do so many people oppose the use of polyethylene polypropylene waterproof coiled materials? A very important reason is that many small manufacturers and workshops use polyethylene recycled materials to make polyethylene polypropylene waterproof coiled materials, which affects the service life of the materials. In Shandong, Hebei and other places, some traders make foreign garbage into polyethylene 'n' secondary materials and sell them to some workshops in Liaoyang and other places in Liaoning Province. Polyethylene polypropylene waterproof coiled materials produced there are The square meter is only sold for threeorfour yuan, which cannot play a waterproof role at all, and has a great impact on the industry. " An industry source who did not want to be named told this

high molecular polyethylene polypropylene composite waterproof coiled material must be made of real polyethylene particle raw material by one-time hot pressing. At present, a large number of fake polyethylene polypropylene composite waterproof rolls in the market use recycled materials for hot pressing. The price difference between recycled materials and real raw materials is twoorthree times. On the market, the price of 0.7mm thick real polyethylene polypropylene composite waterproof coiled material is more than 20 yuan, while the low-quality polyethylene polypropylene composite waterproof coiled material is only sold for 34 yuan, which not only disturbs the normal market order, brings hidden dangers of leakage to buildings, but also causes misunderstanding, making people think that the quality of polyethylene polypropylene composite waterproof coiled material is poor, leading some experts to even suggest that polyethylene polypropylene composite waterproof coiled material should be cancelled

-- insiders

"creating a market environment for fair competition in the waterproof industry is the focus of the industry in the next 5 to 10 years." Zhudongqing, President of China building waterproofing Association, said, "paying close attention to the quality improvement of the whole industrial chain of material production and construction services is the main direction of the transformation and upgrading of the waterproofing industry, and also a way to enhance the overall value of the industry. As a member of the waterproof materials, polyethylene polypropylene waterproof coiled materials further improve the product quality and standardize its scope of use and use, which is what we need to do in the future."

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