Introduction of raw materials for pvc foam board
Introduction of raw materials for pvc foam boardHave you heard of PVC foam board? How much do you know about the raw materials of pvc foam board? I will give you a detailed introduction below:
The main raw material of PVC foam board is polyvinyl chloride, which is a polymer material that uses one chlorine atom to replace one hydrogen atom in polyethylene. The thermoplastic resin polymerized by vinyl chloride under the action of an initiator is a homopolymer of vinyl chloride. Polyvinyl chloride is one of the largest plastic products in the world. It is cheap and widely used. Polyvinyl chloride resin is white or light yellow powder.
This material is referred to as PVC for short, a thermoplastic resin formed by polymerization of vinyl chloride under the action of an initiator. It is a homopolymer of vinyl chloride. Vinyl chloride homopolymer and vinyl chloride copolymer are collectively called vinyl chloride resin. PVC is a white powder with an amorphous structure and a low degree of branching. The molecular weight of industrially produced PVC is generally in the range of 50,000 to 120,000, with greater polydispersity, and the molecular weight increases with the decrease of the polymerization temperature; without a fixed melting point, 80 to 8 polyvinyl chloride starts to soften at 5℃ and changes at 130℃ It is viscoelastic state and begins to change to viscous flow state at 160～180℃; it has good mechanical properties, tensile strength is about 60MPa, impact strength is 5～10kJ/m2; it has excellent dielectric properties. However, it has poor stability to light and heat. It will decompose to produce hydrogen chloride above 100°C or long-term exposure to sunlight, and further automatically catalyze the decomposition, causing discoloration, and the physical and mechanical properties also rapidly decline. Stability must be added in practical applications. To improve the stability to heat and light. PVC is very hard and has poor solubility. It can only be dissolved in a few solvents such as cyclohexanone, dichloroethane and tetrahydrofuran. It is stable to organic and inorganic acids, alkalis and salts. The chemical stability increases with the use temperature. And lower. PVC is dissolved in a mixed solvent of acetone-carbon disulfide or acetone-benzene, and is used for dry spinning or wet spinning to form fibers, called chloroprene. It is flame-retardant, acid and alkali resistant, anti-microbial, wear-resistant and has good thermal insulation and elasticity. One of the raw materials, the price is cheap and widely used. The polyvinyl chloride resin is white or light yellow powder.
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