What's the advantage and disadvantage of pvc production?

What's the advantage and disadvantage of pvc material?

    About PVC, we hear a lot in our life, but do you know what exactly the pvc is?

    PVC(Polyvinyl Chloride), is a material commonly used in our life. Adopted the amorphous material, it has great antioxidant, anti-strong acid, anti-reduction appearance. What's more, it has high strength, excellent stability and non-flammable, which will avoid the corrosion from the climate change. Based on the above reasons, the pvc is a great material with high safety so it's used commonly.

    But everything has two sides. So what's the disadvantage of pvc material?

   To make pvc production, it always mix the pvc material, plasticizer and anti-aging agent. The pvc material is non-toxic, while the other adhesive agent has toxicity. Plasticizers in daily-use polyvinyl chloride plastics, mainly using dibutyl terephthalate, dioctyl phthalate, etc., these chemicals are toxic, polyvinyl chloride anti-aging agent lead stearate is also poisonous. Lead-salt-containing polyvinyl chloride (PVC) products in contact with ethanol, ether and other solvents will precipitate lead. When the lead-containing polyvinyl chloride is used as a food packaging and meets fritters, fried cakes, fried fish, cooked meat products, and cake snacks, the lead molecules will diffuse into the grease, so PVC plastic bags cannot be used. Foods, especially foods containing oil. In addition, polyvinyl chloride plastic products will slowly decompose hydrogen chloride gas at a relatively high temperature, such as about 50 ° C. This gas is harmful to the human body, so polyvinyl chloride products should not be used as food packaging.

　Since most of the disposable medical device products use medical grade polyvinyl chloride (PVC) or polycarbonate (PC), the thermal decomposition products in the PVC processing process are highly corrosive to the steel, and the PC has high hardness and high viscosity. Therefore, the material requirements of the plasticized parts must be corrosion-resistant, wear-resistant and have high polishing performance. Most medical injection molding machines use a barrel screw to hard chrome or stainless steel to make a simple screw to meet the above special requirements. In addition, in order to prevent the thermal decomposition of PVC during the processing of the gas, it is required to carry out the aluminizing treatment on the surface of the stationary template, and also to perform aluminum plating on the peripheral sheet metal or to form sheet metal using a stainless steel plate, and the sheet metal seam is sealed with non-toxic silica gel. In order to prevent the gas generated during the plastic processing from running out (the gas generated during the plastic processing process can be collected by special equipment and then purified to be discharged into the atmosphere). PVC is the main source of dioxins. Dioxin (TCDD), the most deadly substance in the dioxins family, is a well-known carcinogen and hormone decomposer and a toxic compound that poses a significant hazard to humans and animals. Dioxins are produced when PVC is produced, recycled, and destroyed in an incinerator, or when PVC products are accidentally burned, such as landfills.