1 VC copolymer
If the composition of the copolymer resin of V C (vinyl chloride) and other monomers contains polar or large group components, the heat distortion temperature of the copolymer will increase accordingly. The heat resistance is better than that of PVC. Heat-resistant products can be made. The softening temperature of PVC is 78°C. The softening temperatures of copolymers of vinyl chloride-vinylidene chloride, vinyl chloride-methyl methacrylate, and vinyl chloride-acrylonitrile are 100~130, 85, 140~150°C, respectively.
2 PVC chlorination
It is made by chlorination of PVC resin. Its chlorine content is 62%~68%. Chlorinated polyvinyl chloride can be used continuously at 100°C (20~35°C higher than PVC). The use temperature can reach 100~105°C. It has better chemical stability, flame resistance and cold resistance than PVC. However, the anti-corrosion requirements of chlorination equipment are strict. The resin is not easy to process, and its poor impact toughness restricts its application and development.
3 PVC crosslinking
Cross-linked PVC can be prepared by radiation cross-linking method and chemical cross-linking method. The cross-linked PVC products have higher mechanical strength, better dimensional stability, heat deformation, abrasion resistance, and chemical resistance than ordinary PVC products. Radiation cross-linked wires can be used continuously at 100~110℃.
4 Blending of PVC with other polymers
PVC is mixed with other polymers in a certain proportion. The performance of the blend (fully compatible) is improved compared with PVC. Because of the compatibility of the two polymers after mixing, they can reach the molecular level and form a single-phase structure, so that the properties of the blend can be supplemented and strengthened, such as PVC/PS.PVC/PE.PVC/CPVC, etc.
5 Add heat-resistant modifier
Heat-resistant modifiers are a type of polymer with higher heat resistance developed and produced to improve the heat resistance of PVC. (1) Polyglutarimide: prepared by the reaction of polymethyl methacrylate and CH3NH4: (2) SMA (styrene-maleic anhydride copolymer) is a better heat-resistant modification of PVC introduced by American manufacturers Agent: (3) HT-510 (Japan) is a propylene-based imine-based copolymer. It is a heat-resistant additive that can effectively improve the transparency and opacity of PVC mixtures that can resist high temperatures.
6 Add inorganic value material to PVC
After adding a certain amount of filler, it can improve the heat resistance of PVC. Commonly used fillers are: heavy calcium carbonate, light calcium carbonate, precipitated calcium carbonate, calcined pottery, barium sulfate, red mud, titanium self-powder, etc.
7 Add glass fiber to PVC
Add 20%~30% glass fiber to PVC. Its heat resistance can be increased to above 100℃. It can make PVC resin and glass fiber bond well without adding (or less) plasticizer Especially long-fiber reinforced PVC. Its heat distortion temperature increases more obviously.
8. Ordinary CPVC improves Vicat
The processing performance of the material will deteriorate, and impact modifiers need to be added to offset it. If α-methylstyrene is used to increase the Vicat (every 1% addition of the Vicat is about 2-3°C), the processing temperature will be increased, and the physical and mechanical properties will be reduced, but the amplitude is smaller than that of CPVC. Also add impact modifier to offset.
9. Some varieties of PVC heat-resistant modifiers:
TELALLOY A15 is a heat-resistant modifier for PVC of ABS series, which can greatly improve the heat resistance of PVC resin without damaging the inherent characteristics of PVC resin. The use of this product in soft and semi-rigid artificial leather can greatly improve its wrinkle retention. Japan Zhongyuan TELALLOY A50B is a heat-resistant modifier for ABS PVC. GE-BLENDEX 587 (B587) resin modifier (thermoplastic temperature increasing agent) improves the special polymer used in PVC homopolymer and copolymer products, provides excellent high temperature resistance, Vicat B120/49N 127 degrees. GE-BLENDEX 586 (B586) resin modifier (improving thermal deformation type temperature agent) to improve the special polymer used in PVC homopolymer and copolymer products, providing excellent high temperature resistance, Vicat 120 degrees. GE-BLENDEX 703 (B703)(70703)) resin modifier (B586 70%+338 30%) is dedicated to increase the thermal deformation temperature and toughening effect. It can be alloyed with BAS and PVC to improve the heat resistance of the product Advantages of both performance and impact modification
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