Casually Buy PVC Tube, A Pinch Flat, What Is The Reason?
Casually buy PVC tube, a pinch flat, what is the reason?
PVC material is a kind of plastic decorative material, is referred to as PVC material, PVC (Polyvinyl Chloride, referred to as PVC) resin is Vinyl Chloride Monomer (VCM) polymerization of thermoplastic polymers. PVC resin is the main raw material, adding a proper amount of anti-aging agent, modifier and so on, through mixing, calendering, vacuum blister and other processes. PVC is an amorphous polymer, containing crystalline 5%--10% microcrystalline (melting point 175 degrees). The physical properties such as molecular weight, crystallinity and softening point of PVC change with the polymerization condition (temperature). With PVC resin as base material, mixed with stabilizers, plasticizers, fillers, colorant and modifier and other additives, plasticized and molded into PVC resin plastic. PVC material has the characteristics of light weight, heat insulation, heat preservation, moisture-proof, flame retardant, simple construction and so on. It is widely used in production and life because of its various specifications, colors and patterns. For example, PVC water pipes, PVC plastic doors and windows, and plastic toys containing PVC, wires and cables. Because of its harm to human body, countries such as Europe, Japan and South Korea are restricting the products using PVC as raw material. The advantages of general PVC resin plastic products are burning resistance, wear resistance, chemical corrosion resistance, gas water vapor leakage, and good leakage. In addition, the comprehensive mechanical energy, products transparent, electrical insulation, heat insulation, noise elimination, shock elimination, etc., is the most superior price of the general type of material. The defects are poor thermal stability and shock resistance. Either hard or soft PVC is easy to be brittle during use. In general, PVC contains two (2 - hexyl) adipate (DEHA) plasticizer which is not allowed by the relevant national standards. DEHA can be easily released at high temperature (over 100 degrees Celsius) and harmful to human health after exposure to human body. Because PVC is a hard plastic, in order to make it softer, a large amount of plasticizers must be added, and plasticizers are easy to release in a heated environment. If you are using DEHA, it will interfere with the human endocrine, cause women to breast cancer, birth defects, reduce the number of male sperm, or even mental disorders.
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