PPE

The difference between PE and ads material of safety helmet

1. PE: Polyethylene

polyethylene is one of the most commonly used polymer materials in daily life, which is widely used in the manufacture of plastic bags, plastic films and milk barrels. Polyethylene is resistant to a variety of organic solvents, a variety of acid-base corrosion, but not antioxidant acids, such as nitric acid. Polyethylene will be oxidized in oxidizing environment. Polyethylene can be considered as transparent in the film state, but when the block exists, because there are a lot of crystals in it, it will have strong light scattering and opaque. The degree of crystallization of polyethylene is affected by the number of branches. The more branches, the more difficult it is to crystallize. The melting temperature of polyethylene crystal is also affected by the number of branches, which ranges from 90 ℃ to 130 ℃. The more branches, the lower the melting temperature. Polyethylene single crystals can be prepared by dissolving HDPE in xylene above 130 ℃. Gas detector structure: – ch2-ch2-ch2-ch2-ch2-ch2-ch2-ch2-ch2-ch22. ABS is a synthetic plastic of acrylonitrile, butadiene and styrene. 1t is the graft copolymerization product of acrylonitrile, butadiene and styrene. 1t is named after the first letter of their English name. 1t is a kind of resin with high strength, good toughness and excellent comprehensive performance. 1t is widely used as engineering plastics. 1n industry, polybutadiene latex or styrene butadiene rubber with low styrene content as the main chain is prepared by graft copolymerization with acrylonitrile and styrene. 1n fact, it is often a mixture of graft polymer containing butadiene and acrylonitrile styrene copolymer San (or as). 1n recent years, styrene and acrylonitrile were copolymerized first, and then mixed with graft copolymerized ABS resin in different proportions to prepare various ABS resins suitable for different uses

industrial production began in the United States in the mid-1950s. 1ndustrial production methods can be divided into two categories: one is the mechanical blending of polybutadiene or styrene butadiene rubber and San resin on the roller, or the blending and copolymerization of the two latex; 1n addition, styrene and acrylonitrile monomers were added to styrene butadiene latex with low content of polybutadiene or styrene, and emulsion graft copolymerization was used or mixed with SAN resin in different proportions. Structure, properties and application in ABS resin, rubber particles are dispersed in the continuous phase of San resin. When impacted, the crosslinked rubber particles bear and absorb the energy, so that the stress is dispersed and the crack development is prevented, so as to improve the tear resistance. The purpose of graft copolymerization is to improve the compatibility and adhesion between rubber particle surface and resin phase. This is related to the amount of free San resin and the composition of San resin grafted on the main chain of rubber. The difference of acrylonitrile content between the two resins should not be too large, otherwise the poor compatibility will lead to the cracking of rubber resin interface. ABS resin can be processed into plastics by injection molding, extrusion, vacuum, blow molding and rolling, and can also be processed by mechanical, adhesive, coating and vacuum evaporation. Because of its excellent comprehensive performance and wide application, it is mainly used as engineering materials and household appliances. Because of its good oil resistance, acid resistance, alkali resistance, salt resistance and chemical reagent resistance, it can be used to replace some metals because of its good electroplating performance, good luster, light specific gravity and low price. 1t can also synthesize many varieties such as self extinguishing type and heat-resistant type to adapt to various uses. Different material safety helmet has different performance, you can make the right choice according to your own needs

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