Preparation method of EVA elastomer

An elastomer and stage technology, applied in the field of preparing polymer materials, can solve the problems of high cost of raw materials and equipment, high energy consumption, high difficulty in polymerization control, and complicated process operation. It is difficult to control the reaction temperature, increase the solid content of the product, and reduce the The effect of the chance of clustering

Active Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, one-time heating operation is basically adopted, the entire polymerization process is difficult to control, the VAc content in the obtained product is too low, and the performance is not good; although the prior art prepares an elastomer with a suitable VAc content, it requires a process of multiple reactors connected in series , and there are many problems such as complex process operation, high difficulty in polymerization control, high cost of raw material equipment and high energy consumption

Method used

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  • Preparation method of EVA elastomer

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Effect test

Embodiment 1

[0028] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure The total reaction time is 4 hours; the control temperature in the pre-polymerization stage is 45°C, the control temperature in the chain growth stage is 60°C, and the control temperature in the chain termination stage is 55°C; under these conditions, the VAc content in the polymerization product is 59.6wt %.

Embodiment 2

[0030] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure The total reaction time is 4 hours; the control temperature in the pre-polymerization stage is 47°C, the control temperature in the chain growth stage is 62°C, and the control temperature in the chain termination stage is 57°C; under these conditions, the VAc content in the polymerization product is 62.2wt %.

Embodiment 3

[0032] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure 8.0MPa; the total reaction time is 4 hours; the control temperature of the reaction pre-polymerization stage is 49°C, the control temperature of the chain growth stage is 64°C, and the control temperature of the chain termination stage is 59°C; under these conditions, the VAc content in the polymerization product is 65.7wt %.

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Abstract

The invention discloses a preparation method of an EVA elastomer. In a single polymerization kettle, ethylene and vinyl acetate carry out free radical copolymerization in a solvent in the presence of an initiator; the free radical copolymerization comprises a pre-polymerization phase, a chain propagation phase, and a chain termination phase; and the controlled pre-polymerization phase, the chain propagation phase, and the chain termination phase are performed at different temperatures to prepare the EVA elastomer. According to the method, the controlled pre-polymerization phase, the chain propagation phase, and the chain termination phase are performed at different temperatures, thus the chance of implosion is largely reduced; the temperature runaway of polymerization and initiator loss caused by once heating are relieved, the reactions of polymerization monomers carry out completely, higher monomer conversion rate and copolymerization yield can be obtained; the copolymerization speed is guaranteed, at the same time, the solid content of products is increased, and the VAc content of polymerization products is adjusted to produce EVA elastomer products for satisfying different needs.

Description

technical field [0001] The invention relates to a method for preparing a polymer material, in particular to a method for preparing an EVA elastomer. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) is obtained by free-radical initiated copolymerization of non-polar, crystalline ethylene monomer and non-crystalline vinyl acetate (VAc) monomer. EVA has excellent elasticity, flexibility, adhesion, low temperature flexibility, weather resistance, chemical corrosion resistance and compatibility with fillers and color masterbatches. The product can be processed in a series of blow molding, foaming, etc. It can also be used for blending modification of polyethylene (PE), polyvinyl chloride (PVC) and industrial rubber products, and is widely used in shoemaking, agricultural film, cable, solar energy and other fields. At present, domestic research on EVA mainly focuses on the improvement of the preparation process of EVA resin with low VAc content (VAc content 15...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F2/06
Inventor 陈博于鲁强刘金伟刘小萌
Owner CHINA PETROLEUM & CHEM CORP
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