Introduction
PVC materials possess qualities such as non-flammability, high strength, weather resistance, and excellent dimensional stability. PVC exhibits strong antioxidant, reducing agent, and acid resistance. However, concentrated sulfuric acid, concentrated nitric acid, and aromatic hydrocarbons or chlorinated hydrocarbons can corrode it, making it unsuitable for contact.
Sources of PVC Characteristics
Heat-resistant modifiers are polymers used to enhance the heat resistance of polyvinyl chloride. Common heat-resistant modifiers include polyphthalamide, styrene-maleic anhydride copolymer (SMA), HT-510, S700N, ABS heat-resistant modifiers (A15, A50B, A10), MBS heat-resistant modifiers (H602, 605, 632), as well as ELIX200, 300, and GE Blendex 702, 703, 586, 975.
Blending PVC with Other Polymers
Adding Inorganic Fillers to PVC Adding a certain amount of filler can improve the heat resistance of PVC. Common fillers include heavy calcium carbonate, light calcium carbonate, precipitated calcium carbonate, calcined clay, barium sulfate, red mud, titanium powder, etc.
Adding Glass Fiber to Polyvinyl Chloride Adding 20% to 30% glass fiber to Polyvinyl Chloride can improve its heat resistance without the need for or with minimal plasticizers, allowing its heat resistance temperature to exceed 100°C. Particularly for PVC reinforced with long fibers, the increase in heat distortion temperature is more significant.
PVC Crosslinking Crosslinked Polyvinyl Chloride can be prepared through radiation crosslinking and chemical crosslinking methods. Crosslinked PVC products have high mechanical strength, good dimensional stability, heat resistance, abrasion resistance, and chemical resistance. Radiation crosslinked wires can be used continuously at 100-110°C.
Conclusion
PVC materials possess advantages such as non-flammability, high strength, weather resistance, and dimensional stability. However, it also has some limitations, such as sensitivity to corrosion by concentrated sulfuric acid, concentrated nitric acid, and unsuitability for contact with aromatic hydrocarbons or chlorinated hydrocarbons. Various methods can be adopted to improve the performance of Polyvinyl Chloride materials, including adding heat-resistant modifiers, blending with other polymers, adding inorganic fillers, adding glass fiber, and crosslinking PVC. These methods can enhance the heat resistance, mechanical properties, and chemical resistance of PVC materials, thereby expanding their applications in various fields. When using PVC materials, it is necessary to choose appropriate improvement methods based on specific circumstances and pay attention to the usage environment to avoid contact with incompatible substances.
Contact
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