Many people must have heard of PVC, but they are confused and don't know what it is. In fact, PVC is a material that is widely used in life. Almost everyone has used things made of PVC. However, in reality, few people really know what PVC means, so follow the professionals to understand what the real PVC means.
PVC
PVC is the abbreviation of English Polyvinyl Chloride, and the Chinese name is also polyvinyl chloride. Using amorphous materials as raw materials, it has super high performance in anti-oxidation, anti-strong acid and anti-reduction. Polyvinyl chloride also has high strength and excellent stability, and is not flammable, and can resist corrosion and other phenomena caused by climate change. It is a very good material and can be seen everywhere in life because of its high safety.
At the same time, as a plastic product with a huge global output, PVC is divided into two types of soft and hard PVC, which provide different options for different use occasions. Among them, soft PVC is usually used as the surface material of floors and ceilings, while hard PVC materials are more used in corrugated board, door and window structures, and various chemical industry manufacturing. Moreover, PVC materials are also changeable. By adding different additives, the physical properties and mechanical properties of PVC can be changed, and it can cope with different use occasions. For example, the soft and hard PVC mentioned above can even be made into transparent materials for special needs.
characteristic
PVC material not only has many advantages such as corrosion resistance, non-flammability, insulation, and oxidation resistance, but also because of its reworkability and low production cost, so that PVC has always maintained a high sales volume in the material market. This is also due to its wide range of uses and affordable prices. Multiple functions did not increase its value. Instead, it has been occupying a piece of the material market at a cheap price. At present, China's improvement of PVC materials and design technology have reached the international advanced level. From the previous need to import special PVC materials from abroad, now we can replace imports with our self-developed PVC and start exporting products abroad.
Polyvinyl chloride is also a kind of plastic that is often used. It is a resin composed of polyvinyl chloride resin, plasticizer and anti-aging agent, and it is not toxic. However, the main auxiliary materials such as plasticizers and antioxidants are toxic. The plasticizers in daily PVC plastics mainly use dibutyl terephthalate and dioctyl phthalate. These chemicals All are toxic, and lead stearate, the antioxidant of polyvinyl chloride, is also toxic. Lead-salt anti-aging agent-containing polyvinyl chloride (PVC) products contact with ethanol, ether and other solvents to precipitate lead. Lead-salt-containing PVC is used for food packaging and encounters with fried dough sticks, fried cakes, fried fish, cooked meat products, cakes and snacks, which will cause lead molecules to diffuse into the grease, so PVC plastic bags cannot be used Contain food, especially food containing oil. In addition, polyvinyl chloride plastic products will slowly decompose hydrogen chloride gas at a higher temperature, such as about 50°C, which is harmful to the human body. Therefore, polyvinyl chloride products are not suitable for food packaging.
Since most disposable medical equipment products use medical grade polyvinyl chloride (PVC) or polycarbonate (PC), the thermal decomposition products in the PVC processing process are corrosive to steel, and PC has high hardness and high viscosity. Therefore, the material requirements for the plasticized parts must be corrosion-resistant, wear-resistant and have high polishing performance. Most medical injection molding machines use hard chromium plating on the barrel screw or use stainless steel as the material to make the machine screw to meet the above special requirements. In addition, in order to prevent the thermal decomposition of the PVC during the process of generating gas, it is required to aluminize the surface of the movable template, and also to aluminize the outer sheet metal or use stainless steel to make the sheet metal. The sheet metal joints are sealed with non-toxic silica gel. In order to prevent the gas generated during the plastic processing from escaping outside (the gas generated during the plastic processing can be collected through special equipment and then purified before being discharged into the atmosphere).
PVC is the main source of dioxins. Dioxin (TCDD), the deadliest substance in the dioxins family, is a well-known carcinogen, hormone decomposer, and a toxic compound, which has great harm to humans and animals. Dioxins are produced when PVC is produced, recycled, and destroyed in incinerators, or when PVC products are accidentally burned, such as when buried in garbage.
When there is a large amount of demand, it is easy to be mixed and uneven in quality. Especially when ordinary users buy PVC materials by themselves, they are often easily fooled by the black-hearted bosses of small shops. Inferior PVC materials are far inferior to good quality PVC materials in terms of abrasion resistance and pollution resistance. Products made of low-quality PVC not only have poor functionality, but also have a very short service life. Therefore, when you buy PVC materials on your own, please be sure to go to the relevant specialty stores to buy them.
The current ice hockey tape uses modified pvc, not the pvc that we commonly use to make pvc insulation tape. But because of the price, many markets use ordinary pvc instead of improved pvc
