High viscosity polyvinyl acetate emulsion and preparation method thereof

A technology of polyvinyl acetate emulsion and vinyl acetate monomer is applied in the field of polyvinyl acetate emulsion and its preparation, which can solve the problems of affecting the appearance of emulsion glue, affecting the environmental protection and performance of emulsion glue, and being difficult to eliminate, and achieving easy industrial production. , the conditions are not high, the effect of easy operation

Active Publication Date: 2012-03-14
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general industries, ordinary viscosity emulsion glue can meet the requirements of use, but in some special industries, such as photo frames and other decorative industries, ordinary viscosity emulsion glue cannot meet the requirements of use. However, such methods will not only affect the environmental protection and performance of latex, but also produce a large number of bubbles that are difficult to eliminate, which will affect the appearance of latex.

Method used

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  • High viscosity polyvinyl acetate emulsion and preparation method thereof
  • High viscosity polyvinyl acetate emulsion and preparation method thereof
  • High viscosity polyvinyl acetate emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of a high-viscosity polyvinyl acetate emulsion is as follows:

[0027] Add 428.0g deionized water into a four-necked flask, add 25.0g PVA1788, 50.0g PVA1792, 2.1g emulsifier X-100, 1.0g sodium bicarbonate, 2.0g polyethylene glycol 400 (PEG-400) under stirring , The temperature is raised to 80°C. The initiator was prepared with 65.0 g deionized water and 1.3 g potassium persulfate. After 1 hour of dissolving, 25.0 g of initiator was added to the reaction flask, and 420.0 g of vinyl acetate monomer and initiator were added dropwise to react for about 4 hours. Add the remaining 10.0g initiator within 15 minutes, keep it at 85°C for 1 hour, lower the temperature, wait for the temperature to drop to 40°C, add 40.0g dibutyl phthalate, mix well and discharge. The viscosity of the synthesized polyvinyl acetate emulsion measured at 25°C (LVGT viscometer 4# rotor 1.5 rpm) was 280000 mpa·s.

Embodiment 2

[0029] The preparation method of a high-viscosity polyvinyl acetate emulsion is as follows:

[0030] The reaction raw materials are: 426.8g deionized water, 40.0g PVA2488, 10.0g polyvinylpyrrolidone, 2.1g emulsifier X-100, 1.0g sodium bicarbonate, 65.0g deionized water and 1.3g potassium persulfate to prepare initiator, acetic acid 420.0 g of vinyl ester monomer and 42.0 g of dioctyl phthalate. The reaction process was the same as in Example 1, and the viscosity of the synthesized polyvinyl acetate emulsion was 220,000 mpa·s.

Embodiment 3

[0032] The preparation method of a high-viscosity polyvinyl acetate emulsion is as follows:

[0033] The reaction raw materials are: 427.0g deionized water, 25.0g PVA2488, 25.0g PVA1788, 3.0g Tween-60, 1.7g Span-60, 1.0g sodium bicarbonate, 40.0g deionized water, 1.0g sodium tartrate, 40.0 g deionized water and 3.0 g hydrogen peroxide (the mass concentration of hydrogen peroxide is 27.5%) are prepared into a redox initiator, 420.0 g vinyl acetate monomer, and 22.0 g dibutyl phthalate. The reaction process was the same as in Example 1, and the viscosity of the synthesized polyvinyl acetate emulsion was 250,000 mpa·s.

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Abstract

The invention relates to a high viscosity polyvinyl acetate emulsion. The high viscosity polyvinyl acetate emulsion is characterized in that: the emulsion is prepared from the following raw materials, wherein the raw materials comprise a vinyl acetate monomer, an emulsifying agent and protective colloid; the emulsifying agent is the non-ionic emulsifying agent, and the protective colloid is polyvinyl alcohol. According to the present invention, the viscosity of the high viscosity polyvinyl acetate emulsion exceeds 200000 mpa.s; after the high viscosity polyvinyl acetate emulsion is uniformly mixed with the cellulose and the filler, the resulting mixture is coated on the woodworking decorative sheet material, the coated material has advantages of good initial adhesion, no foaming, no cracking, high strength and the like; the high viscosity polyvinyl acetate emulsion of the present invention provides significant application effects for photo frame and other decorative industries with high emulsion viscosity requirements.

Description

Technical field [0001] The invention relates to the technical field of high molecular polymers, in particular to a polyvinyl acetate emulsion and a preparation method thereof. technical background [0002] Polyvinyl acetate emulsion is also called white latex or white latex. It has the advantages of low price, convenient use, non-toxic, non-polluting, and good viscosity. As an adhesive, it has been widely used in paper processing, wood processing, construction and coatings, etc. industry. Its main production materials are vinyl acetate, water, initiators, protective colloids, emulsifiers, pH regulators and plasticizers. In general industries, milky white glue of ordinary viscosity can meet the requirements of use, but in some special industries, such as decorative industries such as photo frames, milky white glue of ordinary viscosity cannot meet the requirements of use. The existing technology uses external solvents or high hydrophilicity. Resin and other methods increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L31/04C08K5/12C08F118/08C08F2/30C09J131/04
Inventor 吴江红戴祖贵罗丽华
Owner CHINA PETROCHEMICAL CORP
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