Production method of expandable polystyrene with high-foaming-multiplying power

Abstract

The invention discloses a production method of expandable polystyrene with high-foaming-multiplying power. The method comprises the following steps of (1) metering pure water; then, adding the pure water into a reaction kettle; during stirring, sequentially adding emulsifiers, activated calcium phosphate and sodium hydroxide; then, adding metered styrene into the reaction kettle; then, sequentially adding benzoyl peroxide, tert-butyl peroxybenzoate, a nucleating agent, dioctyl phthalate and white oil; uniformly mixing the materials; (2), introducing steam into a reaction kettle jacket; (3) adding calcium phosphate and emulsifiers; (4) adding mixed pentane; (5) raising the temperature; (6) introducing cooling water for lowering the temperature of the reaction kettle; (7) feeding the material liquid into a centrifugal machine; dewatering the materials; performing drying treatment on the dewatered materials by a hot air flow; (8) adding a coating layer; obtaining a product. The particles produced by the method can be subjected to pre-foaming for a plurality of times; the pre-foamed foam particle unit volume weight is lighter; the foam holes are fine and dense; little steam is used; the combination performance of a product is good.

Description

technical field [0001] The invention relates to a production method of expandable polystyrene with a high expansion ratio, which is applied in the technical field of EPS production and processing. Background technique [0002] Polystyrene foam is used in the fields of cushioning packaging materials for electronic appliances, vegetable and fruit packaging boxes, and floating products on the sea. As packaging materials, foam plastics should have the characteristics of high strength, good bonding, and not easy to break. The polystyrene foam plastics produced by the production method have low density and are easily damaged. At the same time, a large amount of steam is consumed during pre-expansion and molding, and the production cost is relatively large. Contents of the invention [0003] In order to solve the above problems, the present invention discloses a method for producing expandable polystyrene with a high expansion ratio, which consists of the following steps: [000...

AI Technical Summary

Problems solved by technology

[0002] Polystyrene foam is used in the fields of cushioning packaging materials for electronic appliances, vegetable and fruit packaging boxes, and floating products on the sea. As packaging materials, foam plastics should have the characteristics of high strength, good bonding, and not easy to break. The polystyrene foam produced by the production method has a low density and is easily damaged. At the same time, it consumes a large amount of steam during pre-expansion and molding, and the production cost is relatively high.