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Preparation technology of EVA water-based dispersion

A water-based dispersion and preparation technology, which is applied in the field of polymer materials, can solve the problems of complex components and difficult control of compounding, and achieve the effect of good compounding performance and broad application prospects

Inactive Publication Date: 2019-11-15
上海欧畅新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of producing EVA water-based dispersion, in order to improve the efficiency of EVA water-based in the current process, one method is to first dissolve the EVA resin with an organic solvent, mix it with water and then remove the organic solvent. The volatilization of EVA will bring a series of environmental protection and safety problems; another commonly used method is to add emulsifiers, phase inversion agents, stabilizers, etc., the essence of these additives is surfactants, but EVA water-based dispersions are used as a Raw material chemicals, the more complex their composition, the more difficult it is to control the compounding with other components in production

Method used

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  • Preparation technology of EVA water-based dispersion
  • Preparation technology of EVA water-based dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 provides a kind of preparation technology of EVA aqueous dispersion, comprises the following steps:

[0044] a. drop EVA resin and rheological agent into the reactor, under preset pressure and preset temperature, stir with the first preset stirring speed to obtain molten EVA;

[0045] b. return the reactor to normal pressure, maintain the preset temperature and the first preset stirring speed, add deionized water to the reactor, stir with the second preset stirring speed for 1.5h, let stand, cool, filter, and obtain EVA aqueous dispersion.

[0046] The VA content of the EVA resin is 32wt%, and the melt index is 43g / 10min.

[0047] The rheological agent is polyamide wax.

[0048] The preset pressure is 9 MPa; the preset temperature is 80° C.; the first preset stirring speed is 400 rpm; the second preset stirring speed is 2800 rpm.

[0049] The weight ratio of the EVA resin, polyamide wax and deionized water is 1:0.5:3.

Embodiment 2

[0051] Embodiment 2 provides a kind of preparation technology of EVA aqueous dispersion, comprises the following steps:

[0052] a. drop EVA resin and rheological agent into the reactor, under preset pressure and preset temperature, stir with the first preset stirring speed to obtain molten EVA;

[0053] b. return the reactor to normal pressure, maintain the preset temperature and the first preset stirring speed, add deionized water to the reactor, stir with the second preset stirring speed for 1.5h, let stand, cool, filter, and obtain EVA aqueous dispersion.

[0054] The VA content of the EVA resin is 28wt%, and the melt index is 400g / 10min.

[0055] The rheological agent is polyamide wax.

[0056] The preset pressure is 9 MPa; the preset temperature is 80° C.; the first preset stirring speed is 400 rpm; the second preset stirring speed is 2800 rpm.

[0057] The weight ratio of the EVA resin, polyamide wax and deionized water is 1:0.5:3.

Embodiment 3

[0059] Embodiment 3 provides a kind of preparation technology of EVA aqueous dispersion, comprises the following steps:

[0060] a. drop EVA resin and rheological agent into the reactor, under preset pressure and preset temperature, stir with the first preset stirring speed to obtain molten EVA;

[0061] b. return the reactor to normal pressure, maintain the preset temperature and the first preset stirring speed, add deionized water to the reactor, stir with the second preset stirring speed for 1.5h, let stand, cool, filter, and obtain EVA aqueous dispersion.

[0062] The VA content of the EVA resin is 28wt%, and the melt index is 150g / 10min.

[0063] The rheological agent is polyamide wax.

[0064] The preset pressure is 9 MPa; the preset temperature is 80° C.; the first preset stirring speed is 400 rpm; the second preset stirring speed is 2800 rpm.

[0065] The weight ratio of the EVA resin, polyamide wax and deionized water is 1:0.5:3.

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Abstract

The invention discloses a preparation technology of an EVA water-based dispersion. The preparation technology comprises the following steps that a, EVA resin and a rheological agent are added into a reaction kettle, at the preset pressure and preset temperature, stirring is conducted at a first preset stirring speed, and molten EVA is obtained; b, the normal pressure of the reaction kettle is restored, the preset temperature and the first preset stirring speed are kept, deionized water is added into the reaction kettle, after stirring is conducted for 1-2 hours at a preset stirring speed, standing, cooling and filtration are conducted, and the EVA water-based dispersion is obtained. According to the preparation technology, by adjusting multiple technological parameters, only a small amountof rheological agent is needed, an organic solvent and additives such as an emulgator and a phase inversion agent are not needed, and stable preparation of the EVA water-based dispersion can be achieved; through a compounding technology or cryogenic grinding technology for different EVA resins, the technology is further adjusted and optimized, so that the prepared EVA water-based dispersion can be stored for a long time, the performance, of compounding with other aqueous polymer solutions, of the EVA water-based dispersion is good, and the preparation technology has a wide application prospect.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation process of an EVA aqueous dispersion. Background technique [0002] EVA is a thermoplastic polymer material, which is a polymer with a linear molecular structure. It is formed by copolymerization of ethylene and vinyl acetate under high temperature and pressure. By adjusting the ratio of ethylene and vinyl acetate, different transparency and softness can be obtained. Different EVA resins can be used to manufacture a variety of products, such as films, adhesives, coatings, etc. In order to meet the needs of environmental protection, more and more coatings and adhesives use water-based dispersions of EVA to replace the process of dissolving EVA with organic solvents. [0003] In the process of producing EVA water-based dispersion, in order to improve the efficiency of EVA water-based in the current process, one method is to first dissolve the EVA resin with an organi...

Claims

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Application Information

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IPC IPC(8): C08J3/05C08L23/08
CPCC08J3/05C08J2323/08
Inventor 王正青黄清根黄惠昌黄泽彬李扬勇
Owner 上海欧畅新材料科技有限公司