The raw materials in environmentally friendly plastic packaging bags are divided into two categories: polypropylene, homopolypropylene (all derived from the polymerization of propylene monomer) and copolypropylene (in addition to propylene, there are also a small amount of other monomers). Random co-polypropylene and block co-polypropylene are two major products. So what are the advantages and disadvantages and uses of these PP? The main characteristics of homopolypropylene in plastic packaging bags: ①Small density (only 0.90g/m³, which is the least dense variety among common plastics). ②High rigidity (the rigidity is significantly higher than that of polyethylene, and for products with greater rigidity, when using polypropylene, the wall thickness of the product can be at least 10% lower than when using HDPE). ③High strength (the tensile yield strength reaches 30MPa). ④Good heat resistance (can withstand high temperature sterilization at 120～135℃). ⑤ It has good water and moisture resistance, and has outstanding barrier properties to water vapor. It is an ideal moisture and moisture-proof material. ⑥ Good transparency, and after adding a nucleating agent or stretching processing, the transparency of its parts can be significantly improved, even reaching a level similar to PVC transparent materials. ⑦Good chemical resistance, polypropylene has good chemical resistance, acid, alkali, salt and many chemical substances. ⑧Poor low-temperature impact, showing greater brittleness at around 5℃. ⑨Polypropylene has poor barrier properties to gases such as oxygen and carbon dioxide. The main features of random co-polypropylene in plastic packaging bags: Compared with homopolypropylene, the main characteristics of random copolymer polypropylene are as follows. ①The gloss is improved. ②The cold resistance and low temperature impact performance are improved, and the low temperature embrittlement temperature can be reduced to 0～-15℃. ③The tensile yield strength, rigidity and heat resistance decrease. Block copolypropylene: Compared with homopolypropylene, the main characteristics of block copolypropylene have the following three points. ①The impact strength is improved, especially the low temperature impact performance is significantly improved, and it can still show good impact performance at -30°C. ②The mechanical properties such as tensile yield strength and rigidity are not as good as homopolypropylene, but higher than random copolypropylene. ③Good transparency is not good. Comparison of three polypropylene properties ①Tensile yield strength: homopolypropylene>block copolypropylene>random copolypropylene. ②Rigidity: homopolypropylene>block copolypropylene>random copolypropylene. ③Impact strength: block copolypropylene>random copolypropylene>homopolypropylene. ④Transparency: random copolypropylene>homopolypropylene>block copolypropylene. ⑤ Low temperature toughness: block copolymer polypropylene> random copolymer polypropylene> homopolypropylene.

In 2019, the "Waste Ban" will be further upgraded. Following the ban on the import of domestic waste plastics at the end of 2017, industrial waste plastics will be completely banned on December 31, 2018! In 2019, more attention will be paid to environmental protection. All plastic waste products that endanger the global environment will be replaced by new environmentally friendly plastic products. If companies want to have a place and not be eliminated, then environmental issues must be paid attention to. In the current ecological environment construction, the renewable resource recycling industry needs to improve production technology, integrate science and technology into production, implement standardized processes in accordance with green certification requirements, and develop in the direction of high quality, multiple varieties, high technology, and environmental protection. , So that the recycling industry will finally complete the Nirvana-style transformation and improvement. No matter where it is, "environmental protection" is imperative. The development of enterprises must standardize operations and production links, and there must be no chances. At the same time, they must always pay attention to relevant policies and regulations to avoid losses.

From the beginning of limited plastics, everyone must know. All ordinary plastic bags must be replaced by environmentally friendly and degradable plastic bags. At this time, everyone must be wondering what kind of bag is environmentally friendly and degradable?