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 understand what PVC means, so follow the professionals to understand what PVC really means.

PVC

PVC is the abbreviation of Polyvinyl Chloride in English, and its Chinese name is polyvinyl chloride. Using amorphous materials as raw materials, it has extremely high performance in terms of resistance to oxidation, resistance to strong acids and resistance to reduction. PVC also has high strength and excellent stability, is non-flammable, and can resist corrosion 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, PVC, as a plastic product with a huge global output, is divided into two types of PVC, soft and hard, 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 commonly used in corrugated boards, door and window structures, and various chemical industry manufacturing. And PVC material is also changeable. By adding different additives, the physical properties and mechanical properties of PVC can be changed to cope with different use occasions. For example, the soft and hard PVC mentioned above can even be made into transparent materials to meet special needs. Characteristics

PVC material not only has many advantages such as corrosion resistance, non-flammability, insulation, and anti-oxidation, but also because of its reprocessability and low production cost, PVC has always maintained its leading position in the material market. High sales. This is also due to its wide range of uses and affordable price. The multiple functions have not increased its value, but it has been occupying a piece of the material market at a cheap price. At present, my country'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 use our independently developed and produced PVC to replace imports, and we have begun to export products abroad.

Main hazards

Polyvinyl chloride is also a commonly used plastic. It is a resin composed of polyvinyl chloride resin, plasticizers and antioxidants. It is not toxic in itself. However, the main auxiliary materials such as plasticizers and antioxidants added are toxic. The plasticizers in daily-use PVC plastics mainly use dibutyl terephthalate, dioctyl phthalate, etc. These chemicals All are toxic, and the anti-aging agent lead stearate of PVC is also toxic. When polyvinyl chloride (PVC) products containing lead salt antioxidant come into contact with ethanol, ether and other solvents, lead will precipitate. When PVC containing lead salt is used as food packaging and comes into contact with fried dough sticks, fried cakes, fried fish, cooked meat products, cakes and snacks, the lead molecules will diffuse into the grease, so PVC plastic bags cannot be used. Contain food, especially food containing oil. In addition, PVC plastic products will slowly decompose hydrogen chloride gas at higher temperatures, such as around 50°C. This gas is harmful to the human body, so PVC products are not suitable as food packaging.

Since most disposable medical device products use medical-grade polyvinyl chloride (PVC) or polycarbonate (PC), and the thermal decomposition products during PVC processing are highly corrosive to steel, PC The hardness is high and the viscosity is high, so the material requirements for the parts in the plasticized part 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 to make the machine screw to meet the above special requirements. In addition, in order to prevent the gas generated by thermal decomposition during PVC processing, the surface of the movable and fixed templates is required to be aluminized, and the peripheral sheet metal is also aluminized or stainless steel plates are used to make the sheet metal, and the sheet metal seams are sealed with non-toxic silicone , to prevent the gas generated during the plastic processing process from escaping to the outside (the gas generated during the plastic processing process can be collected centrally through special equipment and then purified before being discharged into the atmosphere).

PVC is the main source of dioxins. Dioxin (TCDD), the most deadly substance in the dioxin family, is a well-known carcinogen and hormone decomposer and a toxic compound that is very harmful to humans and animals. Dioxins are produced when PVC is produced, recycled and disposed of in incinerators, or when PVC products are accidentally burned, such as in landfills.

When there is a large amount of demand, it is easy to have a mixed bag and uneven quality. Especially when ordinary users purchase PVC materials by themselves, they are often easily deceived by shady bosses of small stores. The performance of inferior PVC materials in terms of wear resistance and anti-pollution is far inferior to that of good quality PVC materials. Products made of inferior PVC not only have poor functionality, but also have a very short service life. Therefore, when purchasing PVC materials by yourself, please be sure to go to the relevant specialty stores to purchase. The above is the content about what pvc means. I hope it can be helpful to everyone!