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Vinyl acetate-acrylate-ethylene multipolymer emulsion and preparation method thereof

A multi-component copolymer and acrylate technology, which is applied in the field of emulsion polymerization, can solve the problems of poor bonding effect and achieve the effect of less residual monomer and good bonding strength

Active Publication Date: 2019-03-26
北京东方石油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of vinyl acetate-acrylic acid ester-ethylene multiple copolymer emulsion that can obtain high bonding strength in order to overcome the defect that the multi-component copolymerized VAE emulsion obtained in the prior art has poor bonding effect on non-polar materials new preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 6 parts of polyvinyl alcohol BP-17 (degree of alcoholysis 88%, degree of polymerization 1700)), 1 part of polyvinyl alcohol BP05 (degree of alcoholysis 88%, degree of polymerization 500), 4 parts of MOS, 4 parts of EFS- 4070, 0.5 parts of sodium acetate, 0.6 parts of ZFS (reducing agent) were dissolved in 95 parts of deionized water, prepared into a water phase, and added to the autoclave; then added vinyl acetate and isooctyl acrylate (the weight ratio was 6:4 ) of mixed monomer 30 parts; feed ethylene to replace the air in the kettle, and then use ethylene to pressurize to 5MPa; start stirring, and use the reactor jacket water to raise the temperature of the material to 70 °C; use a high-pressure metering pump to the reactor Add 15 parts of tert-butyl hydroperoxide aqueous solution with a concentration of 1% by weight at a uniform speed, control the addition in 4 hours, and control the reaction temperature not to exceed 90°C. After adding tert-butyl hydroperoxide aque...

Embodiment 2

[0058] This example is carried out in a method similar to Example 1, except that 6 parts of polyvinyl alcohol BP-17 are replaced by 4 parts of polyvinyl alcohol BP-17, and 1 part of polyvinyl alcohol BP05 is replaced by 3 parts of polyvinyl alcohol For vinyl alcohol BP05, the reaction initiation temperature was changed from 70°C in Example 1 to 90°C.

[0059] All the other are the same as in Example 1.

[0060] As a result, the viscosity of the copolymer emulsion obtained in this embodiment is 3500mpa.s, the solid content is 55.70% by weight, the residual monomer content is 0.72% by weight, the pH value is 4.81, and the glass transition temperature is -31°C. The bond strength of processed BOPP is greater than 40N / 25mm.

Embodiment 3

[0062] This example is carried out by a method similar to that of Example 1, except that in the mixed monomers of this example, the weight ratio of vinyl acetate to isooctyl acrylate is 5:2.

[0063] All the other are the same as in Example 1.

[0064] As a result, the viscosity of the copolymer emulsion obtained in this embodiment is 4600mpa.s, the solid content is 55.40% by weight, the residual monomer content is 0.62% by weight, the pH value is 4.92, and the glass transition temperature is -22°C. The bond strength of processed BOPP is greater than 26N / 25mm.

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PUM

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Abstract

The invention relates to the field of emulsion polymerization and discloses a vinyl acetate-acrylate-ethylene multipolymer emulsion and a preparation method thereof. The method comprises the followingsteps: under an emulsion polymerization reaction condition, (1) in the presence of an oxidization-reduction initiating system, carrying out a first polymerization reaction on a part of mixed monomercontaining a vinyl acetate monomer and an acrylate monomer and vinyl monomer, wherein in the oxidization-reduction initiating system, the oxidizing agent is tert-butyl hydroperoxide and the reducing agent is zinc formaldehyde sulfoxylate and / or sodium formaldehyde hyposulfite; and (2) adding the vinyl monomer and residual part of the mixed monomer into the system after the first polymerization reaction for a second polymerization reaction, wherein in the second polymerization reaction, tert-butyl peroxybenzoate is added into the reaction system. The content of acrylics in the copolymer emulsion obtained by the method is obviously higher than those in common modified EVA in the prior art, and the emulsion is good in bonding strength.

Description

technical field [0001] The invention relates to the field of emulsion polymerization, in particular to a method for preparing a vinyl acetate-acrylate-ethylene multi-polymer emulsion and a vinyl acetate-acrylate-ethylene multi-polymer emulsion prepared by the method. Background technique [0002] Vinyl acetate-ethylene copolymer (VAE) emulsion adhesives have a wide range of bonding and good water resistance. Compared with solvent-based adhesives, water-based adhesives are more environmentally friendly. The proportion of the adhesive in the adhesive is increase year by year. [0003] The traditional VAE emulsion has a high glass transition temperature, insufficient flexibility at low temperature, and insufficient adhesion to non-polar materials such as polyethylene (PE) film and polypropylene (PP) film; pressure-sensitive acrylate emulsions are not suitable for non-polar materials Sexual materials have good adhesion, but often have low cohesion and low bonding strength. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F220/18C08F210/02C08F4/40C08F4/34C09J131/04
CPCC08F4/34C08F4/40C08F218/08C09J131/04C08F220/1808C08F210/02
Inventor 刘冰坡李红立孙焱李文学闫香君
Owner 北京东方石油化工有限公司
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