The cold resistance of pp plastic is poor, and it is susceptible to aging due to light, heat and oxygen in use. It has a wide range of applications in injection molding, drawing, film, fiber and pipe, etc. The following is a specific introduction to the disadvantages and applications of pp plastic ".
1. Disadvantages of pp plastic
1. The product has poor cold resistance and low low temperature impact strength.
2. Products are susceptible to aging due to light, heat and oxygen during use.
3. The colorability is not good.
4. Easy to burn.
5. Poor toughness, high static electricity, poor dyeability, printability and adhesion.
Second, the application of pp plastic
1. PP injection
PP injection molding is mainly used in small household appliances, toys, washing machines, auto parts and so on. In recent years, the improvement of people's living standards and the implementation of the national two-child policy have gradually increased the downstream demand for polypropylene injection molding. Different injection molding products have different demand in the off-peak and peak seasons. For example, injection molding pots and barrels are in demand in the first school season. It is more prosperous, and the demand for accessories and gifts is affected by many festive celebrations. Generally speaking, the application of PP injection plastics is relatively frequent.
2. PP drawing
Polypropylene wire drawing is mainly used in plastic woven products. The daily used container bags, woven bags, food bags and transparent bags are all PP wire drawing products. Since the implementation of the domestic environmental protection policy in 2017, the demand for cement and building materials packaging has declined. The plastic woven industry has suffered a lot, and the corresponding PP plastic woven market is under pressure. In the future, the proportion of PP plastic woven in the overall use of polypropylene will continue to decline, and the plastic woven industry will gradually expand into high-capacity, high-quality large packaging bags. Or low-volume, low-content small packaging bags.
3. PP film
Polypropylene films are generally divided into BOPP films, CPP films, IPP films, and PP films are mainly used for food packaging. Compared with PE packaging bags, PP film food packaging bags have better transparency, greater hardness, and high-end appearance. The downstream demand is mainly Focus on holidays and holidays.
4. PP fiber
Polypropylene fiber is a fiber product made by melt spinning polypropylene as a raw material. Mainly used in decoration, clothing and other fields. Since the implementation of the second child policy in 2011, downstream wet wipes, diapers and other maternal and child products have surged, and there has been a shortage of domestic fiber materials.
5. PP pipe
Because polypropylene has non-toxic and high temperature resistance characteristics, PP pipe materials are mainly used in water supply and heating systems. Compared with PE pipes, PP pipes are lighter in weight, convenient to transport, and have better environmental performance and can be recycled. Generally speaking, from March to May, and from September to October, PP pipe materials are relatively strong. In recent years, the application of polypropylene in special materials such as fibers and pipes has grown rapidly. With the further implementation of the ban on plastics, the import volume of recycled materials and waste plastics has decreased. According to statistics, the total domestic output of PP pellets in August 2018 was 1.5284 million tons. Compared with last year (1.6227 million tons), a decrease of 94,300 tons, or 5.81%, was a decrease in imported materials, which shows that there is still a certain gap in the domestic polypropylene market.