PVC is the abbreviation of (Polyvinylchlorid), the main component is polyvinyl chloride, and other components are added to enhance its heat resistance, toughness and ductility. The top layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is a back coating adhesive.
It is a well-loved, popular and widely used synthetic material in the world today. Its global usage is the second highest among all synthetic materials. According to statistics, in 1995 alone, the production of PVC in Europe was about 5 million tons, while its consumption was 5.3 million tons.
PVC pipe (divided into PVC-U pipe, PVC-M pipe and PVC-O pipe) Rigid polyvinyl chloride pipe is made of polyvinyl chloride resin, stabilizer, lubricant, etc. and then extruded by hot pressing. The earliest plastic pipe developed and applied.
PVC-U pipe has strong corrosion resistance, easy bonding, low price and hard texture, but due to the exudation of PVC-U monomer and additives, it is only suitable for water supply systems with a conveying temperature not exceeding 45 °C. Plastic pipes are used in drainage, wastewater, chemicals, heating and cooling fluids, food, ultrapure liquids, slurries, gases, compressed air and vacuum system applications.
PVC-O pipe, the Chinese name is biaxially oriented polyvinyl chloride, is the latest evolution of PVC pipe, the pipe manufactured by special orientation processing technology, the PVC-U pipe produced by extrusion method is subjected to axial stretching and diameter The long-chain PVC molecules in the pipe are regularly arranged in the biaxial direction, and a new type of PVC pipe with high strength, high toughness, high impact resistance and fatigue resistance is obtained.
PVC can be divided into soft PVC and hard PVC. Among them, hard PVC accounts for about 2/3 of the market, and soft PVC accounts for 1/3. Soft PVC is generally used for the surface layer of floors, ceilings and leather, but because soft PVC contains plasticizers (this is also the difference between soft PVC and hard PVC), the physical properties are poor (for example, the upper water pipe needs to withstand a certain water pressure, soft PVC is not suitable for use), so its scope of use is limited. Hard PVC does not contain plasticizers, so it is easy to form and has good physical properties, so it has great development and application value. In the production process of polyvinyl chloride materials, several additives are bound to be added, such as stabilizers, plasticizers, etc. If all environmental protection additives are used, then PVC pipes are also non-toxic, tasteless and environmentally friendly products.
