Methods for improving the heat resistance of PVC

Category: PVC (popular science, no products)

Release Time: 2020-09-14

Summary: Cross-linked PVC can be produced by radiation cross-linking and chemical cross-linking methods. Cross-linked PVC products have higher mechanical strength, better dimensional stability, and superior heat resistance, wear resistance, and chemical resistance compared to ordinary PVC products. Radiation cross-linked wires can be used continuously at 100~110℃.

1. PVC crosslinking - PVC crosslinking agent

Crosslinked PVC can be produced by radiation crosslinking and chemical crosslinking methods. Crosslinked PVC products have higher mechanical strength, better dimensional stability, and superior heat resistance, wear resistance, and chemical resistance compared to ordinary PVC products. Radiation crosslinked wires can be used continuously at 100-110℃.

2. VC copolymer - PVC crosslinking agent

If the composition of the copolymer resin of VC (vinyl chloride) and other monomers contains polar or large groups, the heat distortion temperature of the copolymer will increase accordingly, and the heat resistance will be better than that of PVC, resulting in heat-resistant products. The softening temperature of PVC is 78℃, while the softening temperatures of the copolymers vinyl chloride-vinyl chloride, vinyl chloride-methyl methacrylate, and vinyl chloride-acrylonitrile are 100-130℃, 85℃, and 140-150℃ respectively.

3. PVC chlorination - PVC crosslinking agent

Chlorinated polyvinyl chloride is obtained by chlorination of PVC resin, and its chlorine content is 62%-68%. Chlorinated polyvinyl chloride can be used continuously at 100℃ (20-35℃ higher than PVC), and the maximum operating temperature can reach 100-105℃. It also has better chemical stability, flame retardancy, and cold resistance than PVC. However, the chlorination equipment has strict corrosion resistance requirements, the resin is difficult to process, and its impact toughness is poor, which restricts its application and development.

4. PVC and other polymer blends - PVC crosslinking agent

PVC is mixed with other polymers in a certain proportion. The properties of the blend (with sufficient compatibility) are improved compared to PVC. Because after mixing two compatible polymers, molecular-level interfusion can be achieved to form a single-phase structure, thereby supplementing and strengthening the properties of the blend, such as PVC/PS, PVC/PE, PVC/CPVC, etc.

5. Adding heat-resistant modifiers - PVC crosslinking agent

Heat-resistant modifiers are a type of polymer with high heat resistance developed to improve the heat resistance of PVC. (1) Poly(pyromellitimide): obtained by the reaction of polymethyl methacrylate with CH3NH4. (2) SMA (styrene-maleic anhydride copolymer) is a better PVC heat-resistant modifier launched by American manufacturers. (3) HT-510 (Japan) is an acrylic series imide copolymer. (4) S700N is an α-methylstyrene-acrylonitrile copolymer. (5) ABS type heat-resistant modifiers: A15, A50B, A10 (Japan's Kanegafuchi). (6) MBS type heat-resistant modifiers: Mitsubishi H602, 605, 632. (7) In addition, there are ELIX200, 300; GE Blendex 702, 703, 586, 975, etc.

6. Adding inorganic fillers to PVC - PVC crosslinking agent

Adding a certain amount of filler can improve the heat resistance of PVC. Commonly used fillers include: heavy calcium carbonate, light calcium carbonate, precipitated calcium carbonate, calcined clay, barium sulfate, red mud, titanium dioxide powder, etc.

7. Adding glass fiber to PVC - PVC crosslinking agent

Adding 20%-30% glass fiber to PVC can increase its heat resistance to over 100℃ without (or with less) plasticizer. The increase in heat distortion temperature is even more significant for PVC reinforced with long fibers.

Guanyuan Ruifeng New Materials Co., Ltd., a professional manufacturer of PVC crosslinking agents, can definitely meet your needs.

Keywords: Methods for improving the heat resistance of PVC

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