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Preparation method of vinyl acetate-ethylene copolymerization emulsion

A technology of ethylene copolymer emulsion and vinyl acetate, applied in the direction of monocarboxylate copolymer adhesive, adhesive type, etc., can solve the problems such as easy generation of sediment in emulsion, unfavorable continuous operation of equipment, decrease in solid content of emulsion, etc. To achieve the effect of convenient industrialization, excellent dilution stability, and improved product quality

Inactive Publication Date: 2018-06-29
SINOPEC SICHUAN VINYLON FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the dilution stability of the currently commercially available vinyl acetate-ethylene copolymer emulsion is not good, and the diluted emulsion is prone to produce sediment, and the sediment will gradually increase as the storage time prolongs, which will not only cause the solid content of the emulsion to decrease, Adhesion performance is reduced, and it will also adversely affect the continuous operation of the equipment

Method used

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  • Preparation method of vinyl acetate-ethylene copolymerization emulsion
  • Preparation method of vinyl acetate-ethylene copolymerization emulsion
  • Preparation method of vinyl acetate-ethylene copolymerization emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 35 parts of water into the reactor, then add 3 parts of PVA1788 and 3 parts of PVA1799 to dissolve, then add 25 parts of vinyl acetate and 10 parts of ethylene and stir evenly. When the temperature inside the reactor reached 60° C., 0.3 parts of zinc formaldehyde sulfoxylate and 0.3 parts of hydrogen peroxide were added. After 25 minutes, control the temperature of the reaction system to 80°C, add 25 parts of vinyl acetate, 6 parts of ethylene, 1 part of PVA0588, 0.1 part of alkylphenol polyoxyethylene ether ammonium sulfate, 0.1 part of zinc formaldehyde sulfoxylate, and 0.2 parts of hydrogen peroxide And 15 parts of water, control the dropwise addition within 60min. Degassing, cooling, filtering, discharging.

Embodiment 2

[0029] Add 30 parts of water into the reactor, then add 1 part of PVA2488, 2 parts of PVA1799 to dissolve, then add 20 parts of vinyl acetate and 10 parts of ethylene and stir evenly. When the temperature in the reactor reached 60° C., 0.1 parts of sodium formaldehyde sulfoxylate and 0.2 parts of hydrogen peroxide were added. After 25 minutes, control the temperature of the reaction system to 80°C, add 20 parts of vinyl acetate, 6 parts of ethylene, 1 part of PVA1088, 0.01 part of ammonium salt of alkylphenol polyoxyethylene ether sulfonate, 0.1 part of sodium formaldehyde sulfoxylate, and 0.2 parts of peroxide Hydrogen and 10 parts of water were added dropwise within 120 minutes under control. Degassing, cooling, filtering, discharging.

Embodiment 3

[0031] Add 32 parts of water into the reactor, then add 1.5 parts of PVA1788 and 1.5 parts of PVA1799 to dissolve, then add 20 parts of vinyl acetate and 7 parts of ethylene and stir evenly. When the temperature inside the reactor reached 50°C, 0.1 part of tartaric acid and 0.1 part of t-butyl hydroperoxide were added. After 30 minutes, control the temperature of the reaction system to 85°C, add 20 parts of vinyl acetate, 5 parts of ethylene, 1 part of PVA0588, 0.1 part of ammonium salt of alkylphenol polyoxyethylene ether sulfonate, 0.1 part of tartaric acid, and 0.1 part of tert-butyl peroxide Hydrogen and 10 parts of deionized water were added dropwise in about 70 minutes. Degassing, cooling, filtering, discharging.

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Abstract

* The invention provides a preparation method of vinyl acetate-ethylene copolymerization emulsion. The vinyl acetate-ethylene copolymerization emulsion is prepared by a semicontinuous process, protective colloid is added in the continuous polymerization process while a stabilizer (alkyl phenol polyoxyethylene ether ammonium sulfate, alkylphenol polyoxyethylene ether sulfonate ammonium salt, ethoxypolyether sulfate or ethoxy polyether sulfonate) is added, and the obtained vinyl acetate-ethylene copolymerization emulsion is white emulsion, has high dilution stability, has excellent adhesive property and mechanical stability, and is very suitable for glass fiber processing, non-woven fabric manufacturing and the like.

Description

technical field [0001] The invention relates to a vinyl acetate-ethylene copolymer emulsion, in particular to a preparation method of a vinyl acetate-ethylene copolymer emulsion. Background technique [0002] Vinyl acetate-ethylene copolymer emulsion (VAE) has excellent adhesive properties and is widely used in construction, coatings, adhesives, packaging, textiles, wood processing and other fields. This product is a water-based adhesive, non-toxic and tasteless, It is pollution-free and meets the requirements of modern environmental protection development. It has passed the FDA (Food and Drug Administration) certification in the United States and can be used as an adhesive for food packaging. [0003] In industry, the semi-continuous emulsion process is generally used to prepare vinyl acetate-ethylene copolymer emulsion. The steps include two stages of initial polymerization and continuous polymerization: initial polymerization is to add protective colloid, emulsifier and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F210/02C08F2/28C08F2/26C09J131/04
CPCC08F2/26C08F2/28C08F218/08C09J131/04C08F210/02
Inventor 吴江红罗丽华刘晶晶
Owner SINOPEC SICHUAN VINYLON FACTORY
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