pvc pipe supply | Sea Widex (certified) | pvc pipe supply provided by Qingdao Rubber Material Co., Widex. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is specialized in "PVC profiles, seals, ABS extrusion profiles, PVC raw material" of the enterprise, the company of "honesty, hard service" concept, for You provide the most quality products and services. Welcome to inquire! Contact: Zhao Shuang. PVC, the abbreviation PVC (Polyvinyl chloride polymer = PVC molecular structure) pvc pipe product supply, is a thermoplastic resin made by the polymerization of vinyl chloride in the role of initiator. Is a homopolymer of vinyl chloride. Vinyl chloride homopolymers and copolymers of vinyl chloride resin system call. PVC amorphous structure of the white powder, the degree of branching is small. Industrial production of PVC molecular weight generally in the range of 50,000 to 120,000 pvc pipe supply, with a larger and more dispersed, with a molecular weight lower polymerization temperature increases; no fixed melting point, 80 ~ 85 ℃ begins to soften pvc pipe supply manufacturers, 130 ℃ into a viscoelastic state pvc pipe fittings supply, 160 ~ 180 ℃ began to change for the viscous flow state; has good mechanical properties, tensile strength of about 60MPa, the impact strength of 5 ~ 10kJ / m2; has excellent dielectric properties. However, poor stability to light and heat, at or above 100 ℃ by prolonged exposure to sunlight, it will decompose to generate hydrogen chloride, and further autocatalytic decomposition, cause discoloration, physical and mechanical properties is also decreased rapidly, in practice must be added to stabilize agents to improve the stability to heat and light. PVC thermal stability and lightfastness poor. At 140 ℃ decomposition of hydrogen chloride at the beginning, with the number of adverse reactions plasticizer content. Further, Influence of Pigments on the PVC, the pigment is reflected in the reaction and the pigment itself migration resistance, heat resistance and the occurrence of PVC and other components consisting of PVC products. Colored PVC therefore, considering the resin used and the characteristics of the relevant additives, pigment binding characteristics. In selecting the coloring agent should be noted that the following questions. Stability of the colorant in some of the ingredients may prompt degradation of the resin. Such as iron ions and zinc ions are PVC resin catalyst degradation reactions. Therefore, the use of iron oxide (red, yellow, brown and black) pigment or zinc oxide, zinc sulfide and lithopone white pigment will reduce the thermal stability of PVC resin. Some colorants may be the role of the degradation products of PVC resin occurs. Ultramarine pigments such as acid resistance, poor class, so in PVC coloring process, will be produced by the decomposition of hydrogen chloride and PVC lose their color and interact.