Hot-melt adhesive ethylene-vinyl acetate copolymer and process for producing same
A vinyl acetate, production process technology, applied in the direction of adhesives, etc., can solve the problems of high cycle pressure difference and rapid growth
Inactive Publication Date: 2017-03-15
联泓新材料科技股份有限公司
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Problems solved by technology
[0005] The invention provides a hot-melt adhesive ethylene-vinyl acetate copolymer and its production process. The invention overcomes the problem of rapid growth of high cycle pressure difference and solves the difficulty of producing hot-melt adhesive grade ethylene-vinyl acetate copolymer
Method used
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Embodiment 1
[0027] Embodiment 1 A kind of production technology of hot-melt adhesive ethylene-vinyl acetate copolymer, concrete steps are as follows:
[0028] (1) Polymer grade ethylene with a pressure of 3.6MPaG is heated to 35°C by a heater, and then enters the primary compressor. The primary compressor is divided into two stages. The outlet of the primary compressor is equipped with a secondary aftercooler of the primary compressor and a secondary deep cooler of the primary compressor. After the polymer grade ethylene is compressed by the primary compressor, the pressure is 30MPaG. The temperature of polymer grade ethylene after the cryocooler is 30°C;
[0029] (2) The polymerization-grade ethylene that has passed through the primary compressor is mixed with the regulator isobutylene with a pressure of 34MPaG and the comonomer vinyl acetate (VA) with a water content of 60ppm and a pressure of 34MPaG at the inlet of the secondary compressor. The flow ratio of ethylene, vinyl acetate an...
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The invention relates to a hot-melt adhesive ethylene-vinyl acetate copolymer and a process for producing the same, and belongs to the field of technologies for preparing novel materials. The process includes that polymer grade ethylene and vinyl acetate are proportionally compressed by the aid of a compressor and then are fed into a reactor, isobutene is used as a molecular weight regulator, tert-butyl peroxypivalate (C32) with the concentration of 30% is added into the reactor, the total flow is 90 kg / h approximately, continuous reaction is carried out in a reaction kettle, and reaction products are separated from one another by the aid of a high-pressure separator and a low-pressure separator and are subjected to extrusion granulation to obtain the ethylene-vinyl acetate copolymer (EVA) which is a product. The hot-melt adhesive ethylene-vinyl acetate copolymer and the process have the advantages that the problem of fast increase of high circulation pressure difference can be solved, and the problem of difficulty in producing hot-melt adhesive grade ethylene-vinyl acetate copolymers can be solved.
Description
technical field [0001] The invention relates to a hot-melt adhesive ethylene-vinyl acetate copolymer and a production process thereof, belonging to the technical field of new material preparation. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) is a copolymer of ethylene and vinyl acetate (VA). Compared with other flexible materials (such as polyurethane, silicone rubber, fluorinated vinyl resin, etc.), EVA, as a flexible body, has the advantages of easy processing, good compatibility, high deflection, good flexibility, anti-aging, and can resist the natural environment. It has developed into a classic variety in industrial applications, and has become an indispensable variety in the fields of injection extrusion moldings, foamed products, stretched films, wire and cable sheathing adhesives and sealants. Widely used in plastics, rubber, fibers and adhesives and other fields. [0003] As an amorphous plastic, EVA has good elasticity, good fluidity and g...
Claims
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Login to View More IPC IPC(8): C08F210/02C08F218/08C08F210/10C08F2/01C09J123/08
CPCC08F210/02C08F2/01C09J123/0853
Inventor 劳道丹许灿耿洪滔陈海涛
Owner 联泓新材料科技股份有限公司