Method for preparing lamella silicate modified ethylene-vinyl acetate copolymer

Abstract

A manufacturing method for a kind of copolymer of laminated silicate and modified ethylene-vinyl acetate characterizes that the organic clay and polyethylene-vinyl acetate are melted and extruded out on the screw extruder according to the mass ratio of 1~10:99~90, the polyethylene-vinyl acetate contains vinyl acetate 5~28% and its melt index is 1~120g / 10min, extrusion temperature is 160-180 deg.C, screw speed is 160~300rpm, mean detention time is 2 ~ 10min, the interaction between EVA and the laminated silicates is promoted through the grafting of the EVA, then the nano-EVA is inserted between the layers of molten state silicates and the silicate layers begin swelling until they are scattered as single nano-layer state in the EVA-base, then the laminated structure is realized.

Description

technical field [0001] The invention relates to a preparation method of layered silicate modified ethylene-vinyl acetate copolymer. Background technique [0002] Nano layered silicate modified plastic is a kind of nanocomposite material prepared by intercalation compounding of layered silicate and plastic. This new type of nano-modified material perfectly combines the rigidity, dimensional stability and thermal stability of inorganic substances with the toughness and processability of polymers, showing excellent hybrid performance. Compared with ordinary plastics, this nano-modified plastic has high elastic modulus and strength, high barrier and flame retardancy, good thermal stability, etc. Nanoplastics have become a hotspot in the field of new materials research and development in recent years because they can be applied practically and have the most industrialization prospects in nanomaterial technology. [0003] Layered silicates are clay minerals widely distributed in...

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Problems solved by technology

[0012] There are few reports at home and abroad on the research of layered silicate modified ethylene-vinyl acetate copolymer (nano EVA), and the research on nano EVA in my country is still blank.

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