PVC material is a kind of plastic decorative material, and is the abbreviation of polyvinyl chloride material. PVC (Polyvinyl Chloride, referred to as PVC) resin is a thermoplastic polymer polymerized from vinyl chloride monomer (Vinyl Chloride Monomer, referred to as VCM). . It uses polyvinyl chloride resin as the main raw material, adds an appropriate amount of anti-aging agents, modifiers, etc., and is made through mixing, calendering, vacuum blister and other processes. PVC is an amorphous polymer with a crystallinity of 5%--10 % microcrystals (melting point 175 degrees).
The molecular weight, crystallinity, softening point and other physical properties of PVC change with the polymerization reaction conditions (temperature). PVC resin plastic is made from PVC resin as the base material, mixed with various additives such as stabilizers, plasticizers, fillers, colorants and modifiers, plasticized and molded.
PVC materials are lightweight, heat-insulating, heat-insulating, moisture-proof, flame-retardant, and easy to construct. There are many specifications, colors and patterns, and they are highly decorative and are widely used in production and life. For example, PVC water pipes, PVC plastic doors and windows, as well as plastic toys containing PVC, wires and cables.
Due to the harm it poses to the human body, countries such as Europe, Japan and South Korea have imposed restrictions on products using PVC as raw materials. The outstanding advantages of general PVC resin plastic products are that they are flame retardant, wear-resistant, resistant to chemical corrosion, and have low leakage of gas and water vapor.
In addition, it combines mechanical properties, product transparency, electrical insulation, heat insulation, sound attenuation, and shock absorption. It is a general-purpose material with the most superior cost performance. The disadvantage is that thermal stability and impact resistance are poor, and whether it is hard or soft PVC, it is easy to become brittle during use.
Generally, PVC contains di(2-ethylhexyl) adipate (DEHA) plasticizer, which is not allowed by relevant national standards. DEHA is easily released at high temperatures (more than 100 degrees Celsius) and is harmful to human health after contact with the human body.
Because PVC is a hard plastic, to make it soft, a large amount of plasticizer must be added. Plasticizers are easily released in a heated environment.