What is a PVC bag? What is the machine for making pvc bags? PVC is polyvinyl chloride. Polyvinyl chloride, English abbreviation PVC (Polyvinyl chloride polymer = PVC molecular structure).
PVC is a thermoplastic resin obtained by polymerizing vinyl chloride under the action of an initiator. It is a homopolymer of vinyl chloride. The vinyl chloride homopolymer and the vinyl chloride copolymer are collectively referred to as vinyl chloride resins. PVC is a white powder with an amorphous structure and a small degree of branching. Industrial production of PVC molecular weight is generally in the range of 50,000 to 120,000, with greater polydispersity, molecular weight increases with the decrease of polymerization temperature; no fixed melting point, 80-85 ° C begins to soften, 130 ° C becomes viscoelastic state , 160 ~ 180 ° C began to transform into a viscous flow state; has good mechanical properties, tensile strength of about 60MPa, impact strength of 5 ~ 10kJ / m2; has excellent dielectric properties.
Poor stability to light and heat, above 100 ° C or after prolonged exposure to sunlight, it will decompose to produce hydrogen chloride, and further autocatalytic decomposition, causing discoloration, physical and mechanical properties also rapidly decline, in the practical application must add stabilizer 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, and its chemical stability increases with the use temperature. And lower. PVC is dissolved in acetone-carbon disulfide or acetone-benzene mixed solvent, used for dry spinning or wet spinning. It is called chlorinated fiber and has the characteristics of flame retardant, acid and alkali resistant, antibacterial and abrasion resistant. Better warmth and flexibility.
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