1, PVC copolymer
When the composition of the PVC (vinyl chloride) and other monomer copolymer resins contains a polar or large group component, the heat distortion temperature of the copolymer is correspondingly increased, and the heat resistance is better than that of PVC, and a heat resistant product is obtained. The softening temperature of PVC is 78 ° C, and the softening temperatures of the copolymers of vinyl chloride-vinyl chloride, methyl chloride-methyl methacrylate and vinyl chloride-acrylonitrile are 100-130, 85, 140-150 °C, respectively.
2. PVC chlorination
Chlorinated polyvinyl chloride is obtained by chlorination of PVC resin, and its chlorine content is 62% to 68%. Chlorinated polyvinyl chloride can be used continuously at 100 ° C (20 ~ 35 ° C higher than PVC), the maximum operating temperature can reach 100 ~ 105 ° C. And chemical stability, flame retardancy, cold resistance are better than PVC. However, chlorination equipment has strict requirements for corrosion protection. Resin is difficult to process, and its impact toughness limits its application and development.
3, PVC cross-linking
Crosslinked PVC can be obtained by radiation crosslinking method and chemical crosslinking method. The crosslinked PVC products have higher mechanical strength, good dimensional stability, heat deformation resistance, wear resistance and chemical resistance than ordinary PVC products. Radiation cross-linked wires can be used continuously at 100~110 °C.
4, PVC blended with other polymers
The PVC is mixed with other polymers in a certain ratio, and the properties of the blend (fully compatible) are improved compared to PVC. Because the compatible two polymers are mixed, molecular-level intermixing can be achieved to form a single-phase structure, which complements and strengthens the properties of the blend, such as PVC/PS, PVC/PE, PVC/CPVC, and the like.
5, adding heat-resistant modifier
The heat-resistant modifier is a type of polymer which has been developed and produced to improve the heat resistance of PVC.
Polyglutarimide: prepared by reacting polymethyl methacrylate with CH3NH4.
SMA (styrene-maleic anhydride copolymer) is a better PVC heat-resistant modifier introduced by American manufacturers.
HT-510 (Japan) is an acrylic series of imine based copolymers.
S700N is an α-methylstyrene-acrylonitrile copolymer.
ABS type heat-resistant modifier: A15, A50B, A10 (Japanese clock).
MBS heat-resistant modifier: Mitsubishi H602, 605, 632.
In addition, there are ELIX200, 300; GEBlendex 702, 703, 586, 975, and the like.
6. Adding inorganic filler 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 powder and so on.
7. Add fiberglass to PVC
20%~30% glass fiber is added to PVC, and the heat resistance can be increased to above 100 °C without adding (or adding less) plasticizer. Especially for long fiber reinforced PVC, the heat distortion temperature increase is more obvious.
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