Talk to you about the main properties and uses of polypropylene (PP).
First of all, what is polypropylene? Polypropylene is abbreviated as "PP". It is a thermoplastic resin with regular configuration and high ELECTRIC THERMAL ACTUATOR (crystallinity as high as 95%) polymerized from propylene. It can be divided into PP injection molding, PP wire drawing, PP fiber, PP film, PP pipe. Among the plastics commonly used in life, polypropylene is one of the lightest varieties.
2. Thermal performance: It has good heat resistance, and its products can be sterilized at temperatures above 100 °C, and will not deform at 150 °C without external force. The embrittlement temperature is -35 °C, and embrittlement occurs below -35 °C, and the cold resistance is not as good as polyethylene.
3. Chemical stability: The chemical stability is very good. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to other chemical reagents, but low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons can make the polymer Propylene softens and swells, and its chemical stability increases with the increase of crystallinity, so polypropylene is suitable for making various chemical pipes and fittings, and has a good anti-corrosion effect.
4. Electrical properties: It has a high dielectric coefficient, and with the rise of temperature, it can be used to make heated electrical insulation products. It also has a high breakdown voltage and is suitable for use as electrical accessories, etc. It has good resistance to voltage and arc, but has high static electricity, and it is easy to age when it is in contact with copper.
Polypropylene is widely used in both household appliances and plastic pipes. Household appliances have developed rapidly in recent years, with many varieties and large output. Therefore, in the next few years, the development of PP special materials for household appliances will be increased to meet the changing needs of the market.
In 2003, the national total output of plastic pipes exceeded 1.8 million tons, a year-on-year increase of 23%. In the early days, PP pipes were mainly used as agricultural water pipes, but the market failed to open due to some problems in the performance of the early products (impact strength and poor aging resistance). But with the introduction of technology, the market has gradually been recognized. Plastic pipes are one of the key products for the promotion and application of chemical building materials in my country. The Ministry of Construction issued a "Notice on Strengthening the Production Management and Promotion and Application of Copolymerized Polypropylene (PP-R, PP-B) Pipes" in 2001, requiring relevant departments Work together to do a good job from raw materials, processing, quality to pipe use and installation, and strictly control the quality of PP pipes, so as to better do a good job in the production, application and promotion of PP pipes in my country.
With the improvement of people's living standards, it is a good development trend to develop transparent PP special materials, especially PP special materials with high transparency, good fluidity, and fast forming are required to design and process into people's favorite PP products. Transparent PP is more characteristic than ordinary PP, PVC, PET, PS, and has more advantages and development prospects. At present, there is a big gap between domestic transparent PP special materials and foreign countries, and the production and application of transparent PP resin and its products still need to be strengthened.
In addition, polypropylene is also used in stretching PP film and so on.
Post time: Sep-24-2022