Characteristics:
Polyvinyl chloride color is slightly yellow translucent, glossy. Transparency better than polyethylene, polypropylene, worse than polystyrene, with different amounts of additives, divided into soft and hard polyvinyl chloride, soft products are soft and tough, sticky feel, the hardness of hard products is higher than the low-density polyethylene, but lower than polypropylene, in the flexure will appear whitening phenomenon. Stable; not easily corroded by acids and alkalis; more resistant to heat.
Polyvinyl chloride has the advantages of flame retardant (flame retardant value of 40 or more), high resistance to chemicals (resistant to concentrated hydrochloric acid, concentration of 90% sulfuric acid, concentration of 60% of nitric acid and concentration of 20% of sodium hydroxide), mechanical strength and good electrical insulation.
Has stable physicochemical properties, insoluble in water, alcohol, gasoline, gas, water vapor leakage is low; at room temperature can be resistant to any concentration of hydrochloric acid, sulfuric acid up to 90%, 50-60% of nitric acid and caustic soda solution up to 20%, has a certain degree of chemical corrosion resistance; salt is quite stable, but able to be dissolved in the ether, ketone, chlorinated aliphatic It is quite stable to salts, but can dissolve in ether, ketone, chlorinated aliphatic hydrocarbons and aromatic hydrocarbons, etc.
Use:
1, PVC profiles
Profiles, profiles is the largest area of PVC consumption in China, accounting for about 25% of the total consumption of PVC, mainly used for the production of windows and doors and energy-saving materials, and its application is still a relatively large increase in the country. In developed countries, the market share of plastic doors and windows is also high, such as Germany for 50%, France for 56%, the United States for 45%.
2, polyvinyl chloride pipe
In many polyvinyl chloride products, polyvinyl chloride pipe is its second largest consumption area, accounting for about 20% of its consumption. In our country, PVC pipe is developed earlier than PE pipe and PP pipe, with many varieties, excellent performance, wide range of use, and occupies an important position in the market.
3, PVC hard materials and plates
PVC in the addition of stabilizers, lubricants and fillers, after mixing, with the extruder can be extruded in various calibers of the hard pipe, profiled pipe, corrugated pipe, used as a downpipe, drinking water pipe, wire casing or stair handrails. The calendered sheets are overlapped and hot pressed to make various thicknesses of rigid sheets. The sheet can be cut into the desired shape, and then welded into various chemical-resistant storage tanks, ducts and containers with hot air using PVC welding rods.
4, polyvinyl chloride packaging materials
Polyvinyl chloride products used for packaging is mainly a variety of containers, film and rigid sheet. pvc containers are mainly produced for mineral water, beverages, cosmetic bottles, but also for the packaging of refined oils. pvc film can be used with other polymers **** extrusion production of low-cost laminated products, as well as transparent products with good barrier properties. PVC film is also used in stretch or heat shrink packaging for mattresses, cloth, toys and industrial goods.
Expanded Information:
PVC is also a frequently used plastic, which is a resin consisting of polyvinyl chloride resin, plasticizers, and antioxidants, and is not itself toxic. However, the added plasticizers, antioxidants and other major auxiliary materials are toxic. The plasticizers in daily-use polyvinyl chloride plastics mainly use dibutyl terephthalate and dioctyl phthalate, which are toxic chemicals, and the lead stearate salt, an antioxidant for polyvinyl chloride, is also toxic.
Polyvinyl chloride (PVC) products containing lead salt antioxidant and ethanol, ether and other solvents will precipitate lead in contact. Containing lead salts of polyvinyl chloride used as food packaging and fritters, fried cakes, fried fish, cooked meat products, cakes and snacks food encounter, it will make the lead molecules diffuse into the 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.
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