Waterproof: What is polymer self-adhesive waterproof membrane?

With the State Council issued on May 18, 2016 by the General Office of the State Council {2016} <<Guiding Opinions on Promoting the Steady Growth, Adjusting Structure and Increasing Benefits of the Building Materials Industry>> "Accelerate the promotion and application of water-based coatings, adhesives and polymer waterproof materials, sealants materials, heat reflective film, pipes and other products”. The waterproof industry has set off a climax of the application of polymer waterproof materials, among which the application of polymer self-adhesive waterproof membranes has the fastest growth, but "the forest is big and there are all kinds of birds", some asphalt self-adhesive waterproof membranes on the market use polymer The banner of self-adhesive waterproof membrane confuses concepts, shoddy and disrupts the market. So what kind of material is the real polymer self-adhesive waterproof membrane? This article will make the following analysis:

1. What is a polymer material?

Polymer materials are also called organic polymer materials, also known as polymers or high polymers. They are composed of one or several molecules or molecular groups (structural units or monomers) that are covalently bonded to form a compound with multiple repeating monomer units. Macromolecules, whose molecular weight is as high as 104 to 106, can be natural products such as fibers, proteins and natural rubber, etc., or non-biological polymers such as synthetic rubber, synthetic resins, and synthetic fibers produced by synthetic methods.

The polymer materials used in waterproof materials are mainly rubber, plastic and thermoplastic elastomers. Rubber includes EPDM rubber, butyl (IIR) rubber, chloroprene (CR) rubber, natural (NR) rubber, etc., plastic (Resin) There are polyethylene (PE), polyvinyl chloride (PVC), ethylene vinyl acetate (EVA) and so on.

Thermoplastic elastomers include thermoplastic polyolefin (TPO), chlorinated polyethylene (CPE), SBS, TPV, etc.

2. What is asphalt material?

Bitumen is a dark brown complex mixture of hydrocarbons of different molecular weights and their non-metallic derivatives. It is mainly a by-product (residue) of petrochemical and coal chemical industry. It can be separated into four parts: saturated, aromatic, colloid and asphaltene. Asphalt is carcinogenic and can be used as a moisture-proof and anti-corrosion material.

Asphalt waterproof materials mainly include traditional paper-based linoleum, SBS modified asphalt waterproof membrane, APP modified asphalt waterproof membrane, asphalt self-adhesive waterproof membrane, asphalt waterproof coating, etc.

3. What is polymer self-adhesive waterproof membrane?

Polymer self-adhesive waterproof membrane is a high-performance and high-creep waterproof membrane made of rubber or plastic sheet or film as the base material, rubber or thermoplastic elastomer as the self-adhesive layer, and compounded by calendering; the self-adhesive layer is mainly There are butyl rubber and SIS hot melt adhesive, etc.

4. What is asphalt self-adhesive waterproof membrane?

Asphalt self-adhesive waterproof membrane is a self-adhesive waterproof membrane made of rubber or plastic sheets or films as the base material, SBS or other rubber-modified asphalt as the self-adhesive layer, and coated; the base material is high Molecular materials, but asphalt self-adhesive layer is not a polymer material.

From the above analysis, we can see that the real polymer self-adhesive waterproofing membrane should be the base material and the self-adhesive layer are polymer materials, if the self-adhesive layer is bitumen material, it does not belong to the category of polymer self-adhesive waterproofing membrane , can only be asphalt self-adhesive waterproof membrane. At present, some manufacturers make the polymer self-adhesive layer non-black (such as white, light yellow, etc.) in order to easily distinguish the polymer self-adhesive layer from the asphalt self-adhesive layer, while the asphalt self-adhesive layer is black, which is very good. distinguish. Therefore, customers must keep their eyes open when purchasing polymer self-adhesive waterproof membranes, and beware of being deceived.