Pvc Products Technology
PVC is a non-crystalline, the polarity of the polymer with the higher softening temperature and the melting temperature
. Pure PVC are generally required plasticizing processing at 160-210. PVC shows the hard and brittle performance due to a polar bond between the micromere. Whats more, PVC intermolecular contain chlorine group, when the temperature reaches 120, pure PVC began to de-HCl reaction appears, it will lead to thermal degradation of PVC. Accordingly, in the processing time required to join the various additives for PVC processing modified and impact-modified, so that it can be processed into useful products.
PVC plastic formulations composed mainly composed of a PVC resin and additives, and according function is further divided into: a heat stabilizer, a lubricant, a processing modifier, impact modifiers, fillers, anti-aging agents, coloring agents etc. Before design PVC formulations, should first understand the performance of PVC resin and various additives.
Raw materials and additives-- PVC resin
The production of PVC plastic resin is polyvinyl chloride resin (PVC), PVC is vinyl chloride monomer polymerization which its production is in second place after PE.
PVC resin due to the polymerization of the dispersing agent can be divided into loose type (XS) and compact (XI). The loose type particle diameter of 0.1-0.2mm, surface irregularities, porous, was cotton spherical, easy to absorb the plasticizer, the compact particle diameter of 0.1 mm or less, surface regularity, solid, was Table Tennis-shaped, easy to absorb plasticizer, loose more.
PVC can be also divided into ordinary level (toxic PVC) and Sanitary.
Non-toxic PVC. Sanitary requirements of vinyl chloride (VC) content of less than lOXl0-6, can be used for food and medicine. According to different synthesis process, PVC can be divided into suspension PVC and PVC emulsion method. According to the National Institute of Standards GB/T5761-93 Universal suspension PVC resin inspection standards ,suspension PVC is divided into PVC-SGl to the PVC-SG8Jk kinds of resin, in which the lower the number, the greater the degree of polymerization, the molecular weight of the more large, the higher the strength, but the melt flow is more difficult, and the processing is also more difficult. To make soft products generally use PVC-SGl, PVC-SG2, PVC-SG3 which need a large number of plasticizers. For example, polyvinyl chloride film using the SG-2 resin, adding 50 - 80 parts of plasticizer. In terms of processing hard products, generally do not increase or a small amount of adding plasticizer, usually choose PVC-SG4, VC-SG5, PVC-SG6, PVC-SG7, PVC-SG8 type. Such as rigid PVC pipe using SG - 4 resin, plastic doors and Windows profile using SG - 5 resin, hard transparent sheet using SG - 6 resin, rigid foam material use SG - 7, SG - 8 resin. PVC paste emulsion method mainly used for artificial leather, wallpaper and floor leather and dipped in plastic products. Some PVC resin which produce by PVC resin manufacturers can be sorted by a degree of polymerization which is the number of unit chain section, degree of polymerization multiplied by the section of chain molecular weight equal to the molecular weight of the polymer.
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