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A kind of silica composite acrylic/epoxy water-based resin and preparation method thereof

A technology of compounding acrylic acid and silica, applied in coatings, anti-corrosion coatings, etc., can solve the problems of poor stability of compound emulsion/dispersion, difficult to obtain products that meet the needs, and the grafting reaction is not easy to occur, and achieves smooth gloss. Affecting, hardness-increasing, dispersion-stabilizing effects

Active Publication Date: 2022-07-05
三棵树(上海)新材料研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the difference in surface energy between inorganic and organic matter, the stability of the composite emulsion / dispersion prepared by the cold blending method is poor, and the characteristics of poor stability can be improved by modifying the inorganic nanoparticles, but the stability cannot be completely solved. sexual problems
[0004] Disadvantage 1: The water-based acrylic / epoxy system prepared by cold-splicing method is easy to delaminate due to compatibility problems, and the paint film performance is poor;
[0005] Disadvantage 2: solution polymerization prepares waterborne acrylic acid / epoxy hybrid, due to the presence of unreacted carboxyl and epoxy groups, storage stability is relatively poor, it is difficult to meet industrial needs;
[0006] Disadvantage 3: The emulsion polymerization method prepares acrylic acid / epoxy hybrid water-based resin. Because in the emulsion environment, the grafting reaction caused by the hydrogen abstraction of the initiator free radical to generate the active point is not easy to occur, so the grafting density is low and the amount of emulsifier is large. Difficult to get products that meet demand

Method used

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  • A kind of silica composite acrylic/epoxy water-based resin and preparation method thereof
  • A kind of silica composite acrylic/epoxy water-based resin and preparation method thereof
  • A kind of silica composite acrylic/epoxy water-based resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The preparation method of silica composite acrylic / epoxy resin comprises the following steps:

[0040] (1) Hybridizing epoxy resin and monomer to form acrylic / epoxy hybrid;

[0041] (2) preparing Janus-type silica particles containing alkyl groups on one side and unmodified on the other side, and then dispersing the Janus-type silica particles in deionized water to form a Janus-type silica particle aqueous dispersion;

[0042] (3) Adding the Janus-type silica particle aqueous dispersion prepared in step (2) into the acrylic / epoxy hybrid prepared in step (1) to form the silica composite acrylic / epoxy resin.

[0043] Step (1) includes the following steps:

[0044] ①Add 50g of epoxy resin to the container, raise the temperature to 100℃, then add 20g of solvent at 200rpm, then increase the speed to 400rpm and turn on nitrogen, and then dropwise add a mixture of 3g of methacrylic acid and 1g of initiator. The resulting mixed solution was added dropwise for 1 h, then heated ...

Embodiment 2

[0060] The preparation method of silica composite acrylic / epoxy resin comprises the following steps:

[0061] (1) Hybridizing epoxy resin and acrylate to form acrylic / epoxy hybrid;

[0062] (2) preparing Janus-type silica particles containing alkyl groups on one side and unmodified on the other side, and then dispersing the Janus-type silica particles in deionized water to form a Janus-type silica particle aqueous dispersion;

[0063] (3) Adding the Janus-type silica particle aqueous dispersion prepared in step (2) into the acrylic / epoxy hybrid prepared in step (1) to form the silica composite acrylic / epoxy resin.

[0064] Step (1) includes the following steps:

[0065] ①Add 70g of epoxy resin E44 to the container, heat up to 110℃, then add 40g of solvent at 150rpm, then increase the speed to 600rpm and turn on nitrogen, and then dropwise add 9g of methacrylic acid and 2g of initiator The mixed solution of the composition was added dropwise for 3h, then the temperature was r...

Embodiment 3

[0081] A preparation method of silica composite acrylic / epoxy water-based resin, comprising the following steps:

[0082] (1) Hybrid epoxy resin and monomer to form acrylic / epoxy hybrid:

[0083] Add 60g epoxy resin E44 to the second container, add 11g ethylene glycol butyl ether and 21.2g n-butanol after heating to 110°C, turn on nitrogen, and drip 6g methacrylic acid and 1.5g under the rotating speed of 500rpm. g benzoyl peroxide mixed solution, the dropping time was controlled at 2h, then the temperature was raised to 120°C and kept for 1h, and then 0.3g of benzoyl peroxide was added and kept at 120°C for 3h to obtain an acrylic acid / epoxy intermediate;

[0084] At a temperature of 110°C, 10g of butyl glycol ether and 20g of n-butanol were added to the third container while stirring, and then 4.8g of methacrylic acid, 35g of butyl acrylate, 13.6g of methacrylic acid, 35g of butyl acrylate, 13.6g of The mixture of methyl methacrylate, 15g acrylic acid / epoxy intermediate pre...

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Abstract

The invention relates to a silica composite acrylic / epoxy water-based resin and a preparation method thereof. The preparation method of a silica composite acrylic / epoxy water-based resin of the present invention comprises the following steps: hybridizing an epoxy resin and a monomer to form an acrylic / epoxy hybrid; preparing a Janus-type silica particle aqueous dispersion ; Add the prepared Janus-type silica particle aqueous dispersion into the acrylic / epoxy hybrid to form the silica composite acrylic / epoxy. In the method, the amount of functional monomer acrylic acid or methacrylic acid is less, the residual carboxyl group is relatively less, the prepared water-based resin is more stable, the storage stability is greatly improved, and a raspberry-like structure is formed, which makes the resin corrosion resistance, Weather resistance and aging resistance are further improved.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a silica composite acrylic / epoxy water-based resin and a preparation method thereof. Background technique [0002] Acrylic resin is excellent in stain resistance, weather resistance and toughness, and epoxy resin is better in adhesion, adhesion and corrosion resistance, so many people study acrylic / epoxy hybrid water-based resin, the commonly used method There are cold spelling, solution polymerization and emulsion polymerization. Cold splicing method, due to compatibility problems, always occurs delamination, and the prepared paint film has poor performance and cannot meet the needs; solution polymerization method, because epoxy groups cannot be completely eliminated, its storage stability often cannot meet the industrial requirements. Acrylic acid / epoxy hybrid water-based resin prepared by emulsion polymerization, because in the emulsion environment, the graft reaction caused by the fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03
CPCC09D151/08C09D5/08C09D7/62C08K2201/011C08K3/36C08K9/06
Inventor 姜美佳李维亚秦玉猛彭程付绍祥洪杰
Owner 三棵树(上海)新材料研究有限公司
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