PVC is the chemical name polyvinyl chloride. Polyvinyl […]
PVC is the chemical name polyvinyl chloride. Polyvinyl chloride has excellent wear resistance, acid and alkali resistance, combustion resistance and insulation properties. However, it has poor stability to light and heat. It will separate out hydrogen chloride at a temperature above 100°C or under light, which will cause the color to turn yellow. At the same time, the above-mentioned good mechanical and chemical properties decline rapidly. Of course, there are solutions. You can add stabilizers such as stearic acid or other fatty acid salts of barium, cadmium, and zinc during processing.
Polyvinyl chloride can generally be divided into two categories: hard and soft. Hard products are processed without plasticizers, while soft products are processed with a large amount of plasticizers. Polyvinyl chloride is originally a rigid plastic, and its glass transition temperature is 80-85°C. After adding plasticizer, the glass transition temperature can be reduced, which is convenient for processing at a lower temperature to increase the flexibility and plasticity of the molecular chain, and it can be made into a soft product that is elastic at room temperature. Commonly used plasticizers are dioctyl phthalate and ortho-ester. Generally, the amount of plasticizer added for soft polyvinyl chloride is 30% to 70% of that of polyvinyl chloride.
Polyvinyl chloride can be processed into various profiles and products after adding plasticizers, stabilizers, lubricants, colorants, and fillers during processing. In addition to the properties similar to general plastic products, polyvinyl chloride materials are light in weight, easy to be colored during the manufacturing process, products are bright in color, and have good decorative properties. The most prominent advantage is that they can be extinguished when they are away from the fire, thus having better fire resistance. , And the price is low, often according to different requirements with different production processes to produce decorative materials for various purposes.
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