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Modified white latex and preparation method thereof

A white latex, modification technology, applied in the direction of monocarboxylate copolymer adhesives, adhesive types, etc., can solve the problems of limiting the use of white latex, reduced bonding strength, poor water resistance, etc., to improve water resistance Performance and adhesive performance, improvement of construction performance, and the effect of preventing gelation

Active Publication Date: 2016-10-26
WUHAN INSTITUTE OF TECHNOLOGY
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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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  • Modified white latex and preparation method thereof
  • Modified white latex and preparation method thereof
  • Modified white latex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 of the present application modified white latex includes the following raw materials in parts by weight (based on monomer mixture quality 100):

[0039] Monomer mixture 100 (wherein the amount of vinyl acetate accounts for 80% of the monomer mixture, 1% of acrylic acid, 14% of isooctyl acrylate, 5% of vinyl tertiary carbonate)

[0040]

[0041] All components involved in Example 1 of the present application can be obtained through public commercial channels.

[0042] The application embodiment 1 modified white latex preparation process such as figure 1 shown, including the following specific steps:

[0043] Add water, buffer, chain transfer agent, polyvinyl alcohol and emulsifier into the three-necked flask, heat up to 88°C under constant stirring, keep this temperature until the polyvinyl alcohol is completely dissolved, then cool down to 60°C to prevent the temperature from being too high Initiate implosion; add 1 / 10 of the total amount of the monome...

Embodiment 2

[0045] The application embodiment 2 modified white latex comprises the raw material of following weight portion (based on monomer mixture quality 100):

[0046] Monomer mixture 100 (wherein the amount of vinyl acetate accounts for 90% of the monomer mixture, 1% of acrylic acid, 4% of isooctyl acrylate, 5% of vinyl tertiary carbonate)

[0047]

[0048] All components involved in Example 2 of the present application can be obtained through public commercial channels.

[0049] The preparation process of the application embodiment 2 modified white latex is as follows:

[0050] Add water, buffer, chain transfer agent, polyvinyl alcohol and emulsifier into the three-necked flask, heat up to 90°C under constant stirring, keep this temperature until the polyvinyl alcohol is completely dissolved, then cool down to 60°C; add to the three-necked flask 1 / 10 of the total amount of the monomer mixture and 1 / 2 of the total amount of the plasticizer, stir evenly; raise the temperature of ...

Embodiment 3

[0052] Embodiment 3 of the present application modified white latex includes the following raw materials in parts by weight (based on monomer mixture quality 100):

[0053] Monomer mixture 100 (wherein the amount of vinyl acetate accounts for 95% of the monomer mixture, 3% of isooctyl acrylate, 2% of vinyl tertiary carbonate)

[0054]

[0055] All components involved in Example 3 of the present application can be obtained through public commercial channels.

[0056] The preparation process is as follows:

[0057] Add water, buffer, chain transfer agent, polyvinyl alcohol and emulsifier into the three-necked flask, raise the temperature to 92°C under constant stirring, keep this temperature until the polyvinyl alcohol is completely dissolved, then cool down to 60°C; add to the three-necked flask 1 / 10 of the total amount of the monomer mixture and 1 / 2 of the total amount of the plasticizer, stir evenly; raise the temperature of the reactor to 75°C, stir for 1.0 hour, then ad...

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Abstract

The invention provides modified white latex and a preparation method thereof. The modified white latex is prepared from, by weight, 100 parts of monomer mixture, 5-10 parts of protective colloid, 0.2-5.0 parts of chain transfer agent, 1.0-5.0 parts of plasticizer, 0.6-1.2 parts of emulsifier, 1.0-2.0 parts of buffering agent, 0.6-0.9 part of initiator and 100-120 parts of water. The monomer mixture comprises main monomers and functional monomers. The weight of main monomers accounts for 80%-95% of the total quantity of the monomer mixture. The main monomers are vinyl acetate, and the functional monomers comprise iso-octyl acrylate and vinyl versatate. The water tolerance and bonding performance of the white latex are improved, and the prepared white latex has the advantages that a coating is good in water tolerance and high in bonding strength.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a modified white latex and a preparation method thereof. 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, and the emulsion diameter is 0.5-2 μm. This kind of polyvinyl acetate emulsion is a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C08F218/08C08F220/18C08F218/00C08F220/06C08F2/38C08K5/11
CPCC08F2/38C08F218/08C08K5/11C09J131/04C08F218/24C08F220/06C08F220/1808
Inventor 张云飞徐贵祥王倩杜飞鹏李亮鄢国平
Owner WUHAN INSTITUTE OF TECHNOLOGY
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