The PVC cling film production line refers to polyvinyl chloride (PVC), abbreviated as PVC. It is a polymer formed by the polymerization of vinyl chloride monomer (VCM) in initiators such as peroxides and azo compounds, or under the action of light and heat, based on the free radical polymerization mechanism. The homopolymer and copolymer of vinyl chloride are collectively referred to as vinyl chloride resin.

The PVC cling film production line indicates that PVC is a white powder with an amorphous structure, low branching degree, and a glass transition temperature of 77~90 ℃. It begins to decompose around 170 ℃ [1], and has poor stability to light and heat. When it is above 100 ℃ or exposed to sunlight for a long time, it will decompose to produce hydrogen chloride, which will be further catalyzed and automatically decomposed, leading to color change. Its physical and mechanical properties will also rapidly decline. In practical applications, stabilizers need to be added to improve stability to heat and light.

The molecular weight of industrial PVC is generally in the range of 50000 to 110000, and it has great polydispersity. The molecular weight increases with the decrease of polymerization temperature and there is no fixed melting point. It begins to soften at 80-85 ℃, becomes viscoelastic at 130 ℃, and becomes viscous at 160-180 ℃. Good mechanical properties, with a tensile strength of about 60MPa and an impact strength of 5-10kj/m2; Has excellent dielectric properties.

The PVC cling film production line indicates that PVC was once the world's largest general-purpose plastic with a wide range of uses. Widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc.

The PVC cling film production line indicates that polyvinyl chloride (PVC) is a polymer material that uses chlorine atoms in polyethylene to replace hydrogen atoms. It is an amorphous polymer with a small amount of crystal structure. The structure of this material is as follows: - (CH2 CHCl) n -. PVC is a linear polymer, in which VCM monomer is mostly connected by head to tail structural join. The carbon atoms are arranged in a zigzag pattern, and all atoms are composed of σ Key connection. All carbon atoms are sp3 hybrid. There is a short isomorphic structure in the PVC molecular chain. As the polymerization temperature decreases, the degree of syndiotactic regularity increases. In the macromolecular structure of PVC, there are head to head structure, branched chain, double bond, allyl group chloride, tertiary chloride and other unstable structures., This results in poor heat deformation resistance and aging resistance. After artificial crosslinking, this disadvantage can be eliminated.