Method for preparing formaldehyde-free ethylene vinyl acetate emulsion

A technology of ethylene copolymer and vinyl acetate, applied in monocarboxylate copolymer adhesives, adhesive types, coatings, etc., can solve problems such as yellowing and discoloration, and achieve strong initial adhesion and consistency , good rheological properties

Inactive Publication Date: 2012-07-25
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the emulsion obtained by this method may cause yellowing and discoloration in some cases

Method used

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  • Method for preparing formaldehyde-free ethylene vinyl acetate emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 120g of polyvinyl alcohol AIRVOL? 205 (degree of alcoholysis 88%, degree of polymerization 500), 77g of polyvinyl alcohol RS-1717 (Japan Kuraray company, degree of alcoholysis 92-94%, degree of polymerization 1700), 12g of polyvinyl alcohol Sodium isooctanoate buffer, 19g of sodium metabisulfite reducing agent and 0.05g of ferrous sulfate co-reducing agent are dissolved in 2255g of deionized water to prepare an aqueous phase, and the above-mentioned 2.5Kg aqueous phase is injected into a 10L container by metering pump a. In the autoclave; feed ethylene to replace the air in the autoclave, and then use ethylene to pressurize to 6MPa; start stirring, and use the reactor jacket water to raise the temperature of the material to the reaction temperature of 80°C; then use the metering pumps b and c to react respectively Inject monomer vinyl acetate (flow 3.75ml / min, monomer specific gravity 0.9342, equivalent flow 3.5g / min) and initiator tert-butyl hydroperoxide (flow 0.01m...

Embodiment 2

[0031]Basic process, parameter are identical with embodiment 1, just polyvinyl alcohol AIRVOL? 205 (degree of alcoholysis 88%, degree of polymerization 500) is adjusted to 110g; Polyvinyl alcohol RS-1717 is replaced by RS-1113 (Japan Kuraray company, the degree of alcoholysis is 97.5-99%, the viscosity of 4% aqueous solution is 16-22mpa.s), and the weight is 85g. The reaction temperature was set at 95°C.

Embodiment 3

[0033] The basic process and parameters are the same as in Example 1, except that polyvinyl alcohol AIRVOL? 205 is replaced by AIRVOL? 203 (degree of alcoholysis 88% polymerization degree 300); polyvinyl alcohol RS-1717 is replaced by RS-1113 (Japan Kuraray company, alcoholysis degree 97.5-99%, 4% aqueous solution viscosity 16-22mpa.s). The reaction temperature was 76°C.

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Abstract

The invention provides a method for preparing formaldehyde-free ethylene vinyl acetate emulsion. The ethylene vinyl acetate emulsion is obtained by copolymerization reaction of ethylene and / or polyvinyl alcohol with monomers such as vinyl acetate and the like in the existence of emulsifier and under the action of redox initiator, wherein pyrosulfite and / or sulfite serve as reducing agent, and organic hydrogen peroxide serves as oxidant. Ethylene vinyl acetate emulsion which completely contains no formaldehyde can be obtained by the method, the problems of yellowing, discoloring and the like can be avoided, and the formaldehyde-free ethylene vinyl acetate emulsion is uniform and stable in quality, wide in viscosity adjustable range, quick in curing, high in primary viscous force and wide in application range.

Description

technical field [0001] The invention relates to a binary copolymer emulsion and a preparation method thereof, in particular to a method for preparing a formaldehyde-free vinyl acetate-ethylene copolymer emulsion. Background technique [0002] Vinyl acetate-ethylene copolymer emulsion is a water-based adhesive with good water resistance and a wide range of bonding. Compared with solvent-based adhesives, water-based adhesives are more environmentally friendly, and they are relatively energy-saving than hot-melt adhesives in use, and their proportion in adhesives is increasing year by year. Vinyl acetate-ethylene copolymer emulsion can also be used as the base material of water-based paint, which produces very little organic volatile matter and has excellent performance, and has gradually been widely used. However, since the vinyl acetate-ethylene copolymer emulsion is generally produced with a formaldehyde-containing redox initiator, the product contains a certain amount of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F210/02C08F4/40C08F2/24C08F2/22C09D131/04C09J131/04
Inventor 刘冰坡
Owner CHINA PETROCHEMICAL CORP
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