PE plastic bag function
Low density (high pressure) polyethylene is often used in large quantities. Polyethylene is waxy and has waxy smoothness. When undyed, low-density polyethylene is transparent, while high-density polyethylene is opaque. Polyethylene (PE) is a highly polymerized chain formed by connecting repeated -CH2- units through the addition reaction and polymerization reaction of ethylene (CH2=CH2). The performance of polyethylene depends on its polymerization mode; Under the catalysis of organic compounds, high-density polyethylene was polymerized by Ziegler-Natta at medium pressure (15-30 atmospheric pressure). Under these conditions, the polymerized polyethylene molecules are linear, the molecular chain is very long and the molecular weight is as high as several hundred thousand. If so
Low density polyethylene (LDPE) is produced by free radical polymerization under high pressure (100-300MPA) and high temperature (190-2 10C), which is a branched PE plastic bag. Polyethylene is insoluble in water and has little water absorption. Even for some chemical solvents, such as toluene and acetic acid, they are only slightly soluble above 70℃. Granular polyethylene can also melt or solidify with the change of temperature in the range of 15℃-40℃, and it absorbs heat when it is heated up; When the temperature drops, it solidifies and gives off heat. Because it absorbs less water, is not easy to get wet, and has insulating properties, it is a good building material. Ming' an packaging