Many people must have heard of PVC, but are confused and don't really know what it is. In fact, PVC is a widely used material in life, almost everyone has used things made of PVC. However, the reality is that very few people really understand the meaning of PVC, then follow the professionals to understand what the real pvc means.
?PVC
PVC is the English abbreviation for Polyvinyl?Chloride, the Chinese name is polyvinyl chloride. Using non-crystalline materials as raw materials, it has superb performance in resistance to oxidation, strong acids and reduction. PVC also has high strength and excellent stability, is non-flammable, and is resistant to corrosion caused by climate change. It is a very good material, because of its high safety, so it can be seen everywhere in life.
In the meantime, PVC, as a plastic product with huge global production, is divided into two types of PVC, soft and hard, which provide different choices for different occasions of use. Soft PVC is often used as a surface material for floors and ceilings, while hard PVC is more commonly used in corrugated boards, door and window construction, and various chemical industry manufacturing. PVC materials are also changeable, and by adding different additives, the physical properties of PVC can be altered and its mechanical properties can be changed to cope with different applications. For example, the two types of PVC mentioned above are soft and hard, and can even be made into transparent materials for special needs.
PropertiesPVC material not only has corrosion resistance, non-flammable, insulation, oxidation resistance and many other advantages, but also because of its reprocessing and low production costs and other characteristics, so that PVC in the materials market has always maintained a high level of sales. This is also due to its wide range of applications and affordable prices. A variety of functions did not let it rise in price, but has been a cheap price to dominate a piece of land in the material market. At present, China in the improvement of PVC materials and design technology has reached the international advanced level. From the previous need to import special PVC materials from abroad to today can be used in our own R & D production of PVC to replace imports, and began to export products to foreign countries.
Main Hazards
PVC is also a frequently used plastic, it is composed of polyvinyl chloride resin, plasticizer and antioxidant resin, itself is not toxic. However, the added plasticizer, antioxidant and other major auxiliary materials have toxicity, daily use of polyvinyl chloride plastic plasticizer, mainly using dibutyl terephthalate, dioctyl phthalate, etc., these chemicals have toxicity, polyvinyl chloride antioxidant lead stearate salts are also toxic. Polyvinyl chloride (PVC) products containing lead salt antioxidants will precipitate lead when in contact with ethanol, ether and other solvents. Lead-containing salts of polyvinyl chloride used as food packaging and fritters, fried cakes, fried fish, cooked meat products, cakes and snack foods meet, it will make the lead molecules diffuse into the oil and grease, so you can not use polyvinyl chloride plastic bags containing food, especially can not be loaded with oil-containing food. In addition, PVC plastic products at higher temperatures, such as about 50 ℃ will slowly decompose hydrogen chloride gas, this gas is harmful to the human body, so PVC products should not be used as food packaging.
Since most disposable medical device products are made of medical grade polyvinyl chloride (PVC) or polycarbonate (PC), and the thermal decomposition of PVC during processing has a strong corrosive effect on steel, while PC has a high degree of hardness and high viscosity, the material requirements for the parts of the plasticizing part must be corrosion-resistant, wear-resistant, and have a high degree of polishing performance. Most of the medical injection molding machine using barrel screw hard chrome plating or stainless steel as the material for the production of machine screw to achieve the above special requirements. In addition, in order to prevent the thermal decomposition of PVC processing gas, the requirements of the movable fixed template surface aluminizing treatment, but also on the periphery of the plate gold aluminizing treatment or stainless steel plate production plate gold, plate gold seams using non-toxic silicone sealing to prevent the plastic processing of gases to the outside (plastic processing of gases can be centralized through a special device and then after the collection of (The gas generated during plastic processing can be collected centrally by special equipment and then purified before being discharged into the atmosphere).
PVC is the main source of dioxin. Dioxin (TCDD), the deadliest substance in the dioxin (hetero)dioxin family, is a well-known carcinogen and hormone decomposers and a toxic compound, which is very harmful to humans and animals. Dioxins are produced when PVC is manufactured, recycled and destroyed in incinerators, or when products of PVC are accidentally burned such as in landfills.
When there is a large number of demand, it is easy to appear mixed, uneven quality phenomenon. Especially in the ordinary user to buy their own PVC materials, often easy to be small stores of black-hearted bosses fooled. Inferior PVC materials in abrasion resistance, anti-pollution performance is far less than good quality PVC materials. Products made of poor-quality PVC not only have poor functionality, but also have a very short service life. Therefore, please be sure to buy your own PVC materials to the relevant specialty stores to buy. The above is about what is the meaning of pvc content, I hope it can help you!