Views: 8 Author: China Xicheng Publish Time: 2021-05-24 Origin: China Xicheng
Introduction to PP sheet
PP Sheet (polypropylene Sheet) is odorless, non-toxic, and tasteless, and is in line with national standards for use. At the same time, its density is relatively small, and it is the lightest kind of general-purpose plastics. Its chemistry is also relatively stable, and it can be used for a long time at a temperature of 100 degrees without deformation. It also has good insulation. It hardly absorbs water and will not react chemically with other products. It also has the advantages of corrosion resistance, acid and alkali resistance. The disadvantage is that it is easy to age. The heat-resistant stability of PVC sheet is very poor and cannot be used in a high temperature environment, and its insulation is incomparable with that of PP sheet. Mechanical properties PVC has high hardness and mechanical properties. And progresses with the increase of molecular weight, but decreases with the increase of temperature. Rigid PVC has good mechanical properties, and its elastic modulus can reach 1500-3000MPa. The elasticity of soft PVC is 1.5-15MPa. But the elongation at break is as high as 200%-450%. The friction of PVC is ordinary, the static friction factor is 0.4-0.5, and the dynamic friction factor is 0.23.
Introduction to PVC sheet
PVC material is a kind of plastic decoration material. It is the abbreviation of polyvinyl chloride material. PVC (Polyvinyl Chloride, abbreviated as PVC) resin is a thermoplastic polymer polymerized by vinyl chloride monomer (Vinyl Chloride Monomer, abbreviated as VCM). . It is made of polyvinyl chloride resin as the main raw material, adding appropriate anti-aging agents, modifiers, etc., through mixing, calendering, vacuum suction and other processes. PVC is an amorphous polymer with a crystallinity of 5%-10 % Of microcrystals (melting point 175 degrees). The physical properties of PVC, such as molecular weight, crystallinity, and softening point, vary with the polymerization reaction conditions (temperature). PVC material has the characteristics of light weight, heat insulation, heat preservation, moisture-proof, flame-retardant, and easy construction. There are many specifications, colors, patterns and rich decorations, which are widely used in production and daily life. For example, PVC water pipes, PVC plastic doors and windows, and plastic toys containing PVC, wires and cables. Because it poses harm to the human body, countries such as Europe, Japan, South Korea and other countries have imposed restrictions on products using PVC as raw materials. The outstanding advantages of general PVC resin plastic products are flame retardancy, wear resistance, chemical corrosion resistance, and low gas and water vapor leakage.
The difference between PP Sheet and PVC Sheet
PP Sheet is odorless, non-toxic, tasteless and conforms to national sanitary standards, and has a low density. It is the lightest kind of general plastic. It can be boiled in water and sterilized by steam at 120 degrees. It can be used for a long time at a temperature of 100 degrees without deformation. At the same time, it has excellent electrical insulation properties and chemical stability, hardly absorbs water, and has no effect on contact with most chemicals. PP is resistant to corrosion, acid and alkali, etc. The disadvantage is that it has poor low-temperature impact resistance and is easier to age, but it can be overcome by modification and addition of antioxidants.
PP sheet is mainly used in acid and alkali resistant equipment, environmental protection equipment, waste water, exhaust gas discharge equipment, washing tower, clean room, semiconductor factory and related industrial equipment. Among them, PP thick sheet is widely used in stamping sheet, mattress sheet, etc.
The heat-resistant stability of PVC sheet is very poor. It starts to soften at 80°C and decomposes at 130°C and releases DEHA gas. PVC is not as electrically insulating as PP, and is generally suitable for low- and low-frequency insulating materials. PVC is resistant to most inorganic acids, alkalis, salts, and most organic solvents.
PVC sheet is made of PVC as a raw material with a honeycomb mesh structure in cross section. PVC sheet is mainly used in building materials, packaging, medicine and many other industries. Such as construction, electroplating equipment, acid and alkali resistant equipment, industrial sewage equipment, chemical industry and so on. According to the degree of softness and hardness, PVC can be divided into soft PVC and hard PVC. According to the production process, it can be divided into PVC skinned foam sheet and PVC free foam sheet.
How to distinguish between pp Sheet and PVC Sheet
PP sheet and PVC sheet, as two different sheets, have certain differences in various aspects, and users should choose according to their needs. First of all, PP sheet is opaque, often in primary colors, beige and porcelain white. The color of PVC sheet is more abundant, there are many colors such as dark gray, light gray, beige and transparent. Secondly, PP sheet and PVC sheet are also different in acid and alkali resistance. PVC has stronger acid and alkali resistance, but the texture is more brittle, can resist ultraviolet radiation, is not flammable, and has light toxicity. PP sheet itself is not anti-ultraviolet, it needs to add anti-ultraviolet agent to achieve anti-ultraviolet effect. The toughness of PP sheet is better than that of PVC sheet. Finally, the weight and temperature of PP sheet and PVC sheet are also different. The specific gravity of PP sheet is generally between 0.91-0.97, and that of PVC is between 1.4-1.6. This should be judged according to the actual situation.