The main raw material of PVC foam board
is PVC resin, which is a white or yellow powder with a relative density of 1.35-1.45. The hardness of its products can be adjusted by adding plasticizers. PVC foam boards are also widely used on various occasions due to their good performance. The followings are the special properties and specific application scope of PVC foam boards.
PVC foam board has high hardness and mechanical properties. It increases as the molecular weight increases but decreases as the temperature increases. Rigid PVC has good mechanical properties, and its elastic modulus can reach 1500-3000 MPa. The elasticity of soft PVC is 1.5-15 MPa. But the elongation at break is as high as 200-450 percent. PVC has average friction, with a static friction coefficient of 0.4-0.5 and a dynamic friction coefficient of 0.23.
The PVC foam board has poor heat resistance. It starts to disperse at 140°C and the melting temperature is 160°C. PVC has a low linear expansion coefficient, flame retardancy, and an oxidation index above 45. Therefore, it is necessary to add heat stabilizers during processing to ensure product performance.
PVC foam board is a polymer with good electrical properties, but its electrical insulation properties are not as good as polypropylene and polyethylene. The dielectric constant, dielectric loss tangent, and volume resistivity are large, and the corona resistance is not good. It is generally suitable for medium and low-voltage and low-frequency insulating materials.
Scope of application
After mixing and plasticizing the PVC foam board with additives, a three-roll or four-roll calendar is used to make a transparent or colored polyester film with a specified thickness, and this method is used to process it into a calendered film. Packing bags, raincoats, tablecloths, curtains, inflatable toys, etc. It can also be processed by cutting and heat sealing. The wide transparent film can be used in greenhouses, plastic greenhouses, and mulching films. Biaxially stretched film can be used for shrink packaging because it shrinks when heated.
When the soft PVC foam board is mixed, add an appropriate amount of foaming agent to make a sheet, which is foamed into foam plastic, which can be used as foam slippers, sandals, insoles, and shock-proof cushioning packaging materials. It can also be made into low-foaming rigid PVC materials and profiles through an extruder to replace wood for trial use. This is a new building material.
PVC foam board is made into the transparent sheet by adding impact modifier and tin stabilizer, mixing, plasticizing and calendering. Thermoforming can be used to manufacture thin-walled transparent containers or vacuum blister packaging. It is an excellent packaging material and decorative material, such as moon cake packaging boxes.
The PVC foam board is added with stabilizers, lubricants, and fillers, and can be made into hard boards of various thicknesses after calendering and overlapping hot pressing. The plate can be cut into the required shape, and then connected with hot air through the PVC welding rod to form various chemical resistant storage tanks, air ducts, and containers.
PVC foam board can resist most inorganic acids, alkalis, salts, and most solvents. Therefore, it is suitable for anti-corrosion materials in the pharmaceutical and chemical industries.
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