Hangzhou Epsole Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of expandable polystyrene eps raw material in China. We warmly welcome you to buy high quality expandable polystyrene eps raw material for sale here from our factory. Good service and reasonable price are available.
Expandable polystyrene eps raw material Nature
Expandable polystyrene eps raw material is white or colorless transparent beads with a certain particle size, with a relative density of 1.05 to 1.06. Can be arbitrarily colored, with good chemical properties. Expandable polystyrene containing low-boiling hydrocarbon foaming agent can increase its volume by 5 to 50 times when heated to 90 to 110 ° C. and other characteristics of the foam. The performance of polystyrene foam is closely related to the microcellular structure, and is related to modifiers and additives. If the flame retardant hexabromocyclododecane is added, the obtained foam has flame retardant properties.
Expandable polystyrene eps raw material Manufacturing method
The production method of expandable polystyrene eps raw material is mainly to fill a certain amount of foaming agent (low-boiling hydrocarbons) into the bead resin obtained by the suspension method. There are roughly three kinds of production processes.
Impregnation method: Inject styrene monomer into a water-based polymerization kettle, add benzoyl peroxide (initiator) and hydroxyethyl cellulose (dispersant), and conduct polymerization at 85-90 °C under stirring. When the degree of polymerization reaches more than 85%, a foaming agent is added, and the polymerization is continued until the end. After washing and drying, an expandable polystyrene product is obtained. The reaction formula is the same as that of general-purpose polystyrene, but it should be filled with a blowing agent.
Impregnation method First, styrene is suspended and polymerized to obtain beads of a certain particle size, and then classified and sieved. Then, add water, dispersant, emulsifier and foaming agent to the bead resin with uniform particles again according to the method of suspension polymerization, and then heat and impregnate it in the reaction kettle to obtain the desired product. The energy consumption of this method is slightly larger than that of the one-step method, but no powder is produced. The reaction formula is the same as that of general-purpose polystyrene, but it needs to be filled with a blowing agent.
The seed polymerization method uses a certain particle size of polystyrene, polyethylene, polyvinyl chloride or polyphenylene ether and other resin powders or microbeads as seeds to suspend in the polymerization medium, and then dropwise the styrene containing the initiator into the reactor. to aggregate. When the polymerization reaction enters the late stage, adding a foaming agent can produce a product with uniform particle size. Expandable polystyrene products with different properties can be produced with different seeds. If polyethylene is used as the seed, the obtained product has good impact resistance and oil resistance; when the polyvinyl chloride is used as the seed, the prepared expandable polystyrene has flame retardancy.
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