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Method for preparing EVA elastomer

An elastomer and ethylene technology, applied in the field of preparing polymer materials, can solve the problems of high ethylene pressure, difficult to control, complicated process and equipment, complicated solvent system, etc., achieve high industrial application value, improve diffusion and initiation efficiency, chain transfer Constant low effect

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

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are many problems such as complex solvent system, high ethylene pressure difficult to control, gas-liquid two-phase copolymerization reaction system, complicated process and equipment, high cost and energy consumption, etc.

Method used

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  • Method for preparing EVA elastomer

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Experimental program
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Effect test

Embodiment 1

[0027] In a single reactor, tert-butanol is used as the single solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the amount is 3.0wt% of vinyl acetate; polymerization temperature The temperature is 65°C, the ethylene pressure is 19.0 MPa, and the reaction time is 4 hours. Under this condition, the VAc content in the polymerized product was 49.7% by weight.

Embodiment 2

[0029] In a single reactor, tert-butanol is used as the single solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the amount is 3.0wt% of vinyl acetate; polymerization temperature The temperature is 65°C, the ethylene pressure is 17.0 MPa, and the reaction time is 4 hours. Under this condition, the VAc content in the polymerized product was 51.1 wt%.

Embodiment 3

[0031] In a single reactor, tert-butanol is used as the single solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the amount is 3.0wt% of vinyl acetate; polymerization temperature The temperature is 65°C, the ethylene pressure is 13.0MPa, and the reaction time is 4 hours. Under this condition, the VAc content in the polymerized product was 57.6% by weight.

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Abstract

The invention discloses a method for preparing EVA elastomer. The method included the step of controlling the pressure of ethylene to make the ethylene completely liquefied in a single reactor with alcohols as a solvent, so that the ethylene and the vinyl acetate are subjected to liquid-liquid single-phase copolymerization and the EVA elastomer is obtained. According to the method based on the existing EVA-elastomer-solution polymerization process, the pressure of ethylene is controlled to make the ethylene completely liquefied so that the liquid-liquid copolymerization can improve the comonomer contact efficiency as well as the solubility of ethylene in the liquid phase, complete the solution single-phase copolymerization, and greatly improve the monomer copolymerization rate and the diffusion as well as the initiator efficiency of the free radicals in the copolymer solution. According to the application requirements of different polymerization products, by adjusting the solvent, the method greatly improves the copolymerization rate and the high solid content of a high-viscosity system. Using the single-reactor process, the method is also capable of avoiding the high-cost and complex-manipulation problem resulting from a raw-material process device of the multi-reactor process. Therefore, the method has high industrial application value.

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 a random copolymer with a high degree of branching. It is a copolymer of non-polar ethylene monomer (E) and strongly polar vinyl acetate monomer (VAc). One of the main ethylene derivative copolymers. Compared with polyethylene (PE), the introduction of VAc monomer into the molecular chain greatly reduces the crystallinity of the polymer, and significantly enhances its aging resistance, impact resistance, compatibility and flexibility. The performance of EVA is closely related to the VAc content of the copolymer system. EVA products with low VAc content have properties similar to LDPE; EVA products with high VAc content have properties that are infinitely close to rubber elastomers. During the polymerization process, by controlling the amount of E and VAc, a wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/02C08F218/08C08F2/06
Inventor 陈博于鲁强刘金伟刘小萌
Owner CHINA PETROLEUM & CHEM CORP
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