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Water-resistant white latex

A technology of white latex and water agent, applied in monocarboxylate copolymer adhesives, adhesive types, adhesive additives, etc., can solve the problems of reduced bonding strength, easy moisture absorption, poor water resistance, etc.

Active Publication Date: 2010-05-12
GUANGDONG SANVO CHEM IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The white latex synthesized by the conventional method is made of polyvinyl alcohol as the protective colloid and polymerized by vinyl acetate through free radical reaction. It has poor water resistance and is easy to absorb moisture. It is easy to open the glue in a humid environment and the bonding strength will be greatly reduced.
This defect is difficult to meet the requirements of practical applications, and also greatly limits the use environment of white latex.

Method used

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  • Water-resistant white latex

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Proportioning by weight, polyvinyl formal aqueous agent (proportioning by weight: deionized water: polyvinyl alcohol: 10% hydrochloric acid solution: formaldehyde: 10% sodium hydroxide solution: urea=75: 8: 0.05: 1.5: 0.05: 0.5, mixing and reacting evenly) 10 parts were added to the reaction kettle equipped with a reflux condenser and a stirrer, and at a stirring speed of 100 rpm, 0.8 parts of sodium dodecylbenzenesulfonate, 0.4 parts of nonylphenol polyoxyethylene ether, 14 parts of deionized water, and stir for 10 minutes; add 8.4 parts of vinyl acetate, 0.15 parts of 5% ammonium persulfate aqueous solution and 0.3 parts of Defoamer 334, heat up to 65 ° C, and wait until the reflux is basically After disappearing, heat up to 80°C, add 47.6 parts of vinyl acetate and 0.15 parts of ammonium persulfate aqueous solution with a concentration of 5% in the remaining weight parts, dropwise add 2 parts of butyl acrylate and 4 parts of diacetone acrylamide, N - 3 parts of methy...

Embodiment 2

[0033] Proportioning by weight, polyvinyl formal aqueous agent (proportioning by weight: deionized water: polyvinyl alcohol: 10% hydrochloric acid solution: formaldehyde: 10% sodium hydroxide solution: urea=85: 9: 0.1:2:0.1:1, mixing and reacting evenly) 8 parts were added to the reaction kettle equipped with reflux condenser and stirrer, and at a stirring speed of 100 rpm, 0.6 parts of sodium dodecylbenzenesulfonate, 0.4 parts of nonylphenol polyoxyethylene ether, 11 parts of deionized water, and stir for 10 minutes; add 9 parts of vinyl acetate, 0.2 parts of 5% concentration of ammonium persulfate aqueous solution and 0.4 parts of Defoamer 334, heat up to 65 ° C, and wait until the reflux is basically After the disappearance, the temperature was raised to 80°C, and 51 parts of vinyl acetate and 0.2 parts of ammonium persulfate aqueous solution with a concentration of 5% were added dropwise, while 1 part of butyl acrylate and 5 parts of diacetone acrylamide, N-hydroxy 2 parts...

Embodiment 3

[0035] Proportioning by weight, polyvinyl formal aqueous agent (proportioning by weight: deionized water: polyvinyl alcohol: 10% hydrochloric acid solution: formaldehyde: 10% sodium hydroxide solution: urea=90:10: 0.15: 2.5: 0.15: 1.5, mixed and reacted uniformly) 13 parts were added to the reaction kettle equipped with a reflux condenser and a stirrer, and at a stirring speed of 100 rpm, 0.9 parts of sodium dodecylbenzenesulfonate, 0.5 parts of nonylphenol polyoxyethylene ether, 12 parts of deionized water, and stir for 10 minutes; add 7.8 parts of vinyl acetate, 0.1 part of 5% potassium persulfate aqueous solution and 0.2 parts of Defoamer 50A, heat up to 65 ° C, and wait until the reflux is basically After disappearing, heat up to 80°C, add 44.2 parts of vinyl acetate and 0.1 part of potassium persulfate aqueous solution with a concentration of 5% in the remaining weight parts dropwise, and simultaneously add 2 parts of butyl acrylate and 4 parts of diacetone acrylamide, N ...

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Abstract

The invention discloses water-resistant white latex, which comprises the following main components: vinyl acetate, butyl acrylate, diacetone acrylamide, N-hydroxymethyl acrylamide, polyvinyl formal water agent, dibutyl phthalate, deionized water, initiator, defoamer, glycol alcohol, emulsifier, 2-amino-2-methyl-1-propanol. The white latex has the following advantages that: 1, polyvinyl formal is used as protective colloid to improve the water resistance of adhesive; 2, the diacetone acrylamide and the N-hydroxymethyl acrylamide are added as modification-polymerization monomer so as to increase crosslinking density and improve bonding strength; and 3, the butyl acrylate is added as the modification-polymerization monomer, and the copolymerization of the butyl acrylate and the vinyl acetate can reduce the glass transition temperature and minimum film-forming temperature of the white latex, improve the low-temperature film-forming performance of emulsion and play a role in internal plasticization so as to increase the flexibility of the white latex.

Description

Technical field: [0001] The invention relates to the technical field of polyvinyl acetate adhesives, in particular to a water-resistant white latex used for processing and installation of floors and boards, and building decoration. Background technique: [0002] White latex, that is, polyvinyl acetate emulsion, is a thermoplastic adhesive made of vinyl acetate through emulsion polymerization. It came out in 1929 and realized industrial production in Germany in 1937. In particular, W. Vinyl alcohol is used as a protective glue to carry out vinyl acetate emulsion polymerization, which greatly promotes the development of polyvinyl acetate emulsion industry. my country began to develop polyvinyl acetate emulsion in the late 1950s, and developed rapidly in the 1970s. The early synthetic white latex used mostly polyvinyl acetate homopolymer emulsion, using polyvinyl alcohol with a hydrolysis degree of about 80% as the protective colloid, using peroxide as the initiator, the solid...

Claims

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Application Information

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IPC IPC(8): C09J131/04C09J11/08
Inventor 陈炳耀潘汉杰郭蕊
Owner GUANGDONG SANVO CHEM IND TECH
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