PP is actually polypropylene, which is said to be non-toxic and harmless. Only PP can be heated in the microwave oven.
Made of polypropylene (PP), it is the only plastic box that can be put into the microwave oven (it should be noted that lunch boxes are usually marked whether they are suitable for use in the microwave oven, and the cover material of some lunch boxes is not PP, so they cannot be put into the microwave oven for heating. It's best not to bring a lid when heating meals. )。
The polypropylene lunch box is thick and strong. When used at the temperature of 140℃- MINUS 30℃, it can be cooked in a high-temperature microwave oven and refrigerated in a low-temperature freezer. Not brittle and aging, non-toxic and tasteless.
Extended data
Polypropylene characteristics
Non-toxic, tasteless, low density, strength, stiffness, hardness and heat resistance are superior to those of low-pressure polyethylene, and it can be used at about 100℃. Good dielectric properties, high-frequency insulation, not affected by humidity, but brittle at low temperature, not wear-resistant, easy to age.
Suitable for manufacturing general mechanical parts, corrosion-resistant parts and insulating parts. Common organic solvents such as acid and alkali have little effect on it and can be used for tableware.
Polypropylene has many excellent characteristics:
1, with a relatively low density of only 0.89-0.9 1, is one of the lightest varieties of plastics.
2, good mechanical properties, except impact resistance, other mechanical properties are better than polyethylene, and the molding processability is good.
3. High heat resistance, and the continuous use temperature can reach 1 10- 120℃.
4, good chemical properties, almost no water absorption, no reaction with most chemicals.
5, pure texture, non-toxic.
6. Good electrical insulation.
7. The transparency of polypropylene products is better than that of high density polyethylene products.
It has many advantages, but it also has disadvantages:
1, the product has poor cold resistance and low impact strength at low temperature.
2. The product is easy to age due to light, heat and oxygen in use.
3, poor coloring.
4, easy to burn.
5. Poor toughness, high static electricity, poor dyeability, printability and adhesion.
home appliances
In recent years, China's home appliance industry has developed rapidly, with many varieties and large output. In 2003, the output of refrigerators, air conditioners, washing machines and microwave ovens in China were18.5 million, 42 million,/kloc-0.7 million and 35 million respectively. According to "2004-2006 China Urban Home Cinema Market Research and Consultation Report", it is estimated that the market scale of home cinema system in China will reach 6.9 million in the next three years.
In addition, various small household appliances also have a huge potential market, which is an excellent business opportunity for modified PP. Some domestic plastic raw material manufacturers have developed special materials for washing machines, such as PP 1947 series and K7726 series, which have been welcomed by washing machine manufacturers. Therefore, in the next few years, efforts should be made to develop PP special materials for household appliances to meet the changing needs of the market.
Plastic pipe
In 2003, the total output of plastic pipes in China exceeded 654.38+800,000 t, a year-on-year increase of 23%. In the early days, PP pipes were mainly used as agricultural water pipes, but due to some problems in the performance of early products (poor impact strength and aging resistance), the market failed to open.
With the introduction of foreign advanced technology by Shanghai Plastic Building Materials Factory for the first time, after the imported PP-R materials were recognized by the market, many manufacturers built PP-R pipe production lines one after another, and the price dropped from 20,000 yuan /t to 30,000 yuan/t at the initial stage of production, but the share of PP-R pipe in the plastic pipe market was still very low.
It reflects that there is still a certain gap between domestic PP-R materials and imported materials, and the quality needs to be improved. It is reported that South Korea has developed a new random polypropylene brand PP-R 1 12 for high-pressure water supply pipes. The pipes produced by this brand can be used for 50 years at 20℃ and ultra-high pressure of 1 1.2MPa.
Plastic pipe is one of the key products in the popularization and application of chemical building materials in China. In 200 1 year, the Ministry of Construction issued the Notice on Strengthening the Production Management and Popularization of Polypropylene (PP-R, PP-B) Pipes, requiring relevant departments to do a good job in raw materials, processing, quality and even use and installation of pipes, and strictly control the quality of PP pipes to
High permeability material
With the continuous improvement of people's living standards, it will inevitably bring different requirements and improvements in culture, entertainment, diet, medical care, materials, room decoration and other aspects. Transparent materials are increasingly used in many items on the market.
Therefore, it is a good development trend to develop transparent PP special materials, especially PP special materials with high transparency, good fluidity and fast molding, and design and process PP products that people like. Transparent PP has more characteristics, advantages and development prospects than ordinary PP, PVC, PET and PS.
References:
Baidu encyclopedia? Polypropylene characteristics