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Preparation method for water-based acrylic acid modified alkyd emulsion and its amino baking varnish

A technology of water-based acrylic and alkyd emulsions, which is applied in coatings, polyester coatings, etc., and can solve the problems of poor water resistance and corrosion resistance of the paint film, slow rise in dryness and hardness of the paint film, poor water resistance and corrosion resistance and other issues, to achieve the effect of increased gloss, easy control of synthesis process and product quality, and improved dryness and water resistance

Inactive Publication Date: 2013-12-25
JIAXING QINGHE GAOLI INSULATION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based acrylic modified alkyd emulsion prepared by this method has good storage stability, and the dryness and corrosion resistance of the paint film are improved, but this method also has many shortcomings: (1) The reaction process is not easy to control, and condensation is easy (2) During the synthesis process, due to the consumption of a large amount of unsaturated double bonds on fatty acids, the later dryness of the resin is not greatly improved due to the lack of unsaturated double bonds; (3) The acid value of the resin is high, and the paint film Poor water resistance and corrosion resistance; (4) More residual monomers and higher toxicity
Although this method overcomes the shortcomings of the water-based acrylic modified alkyd emulsion prepared by the pre-vinyl method, which have poor water resistance and corrosion resistance, and the paint film is dry and the hardness rises slowly, the reaction process is not easy to control, and gelation is prone to occur.

Method used

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  • Preparation method for water-based acrylic acid modified alkyd emulsion and its amino baking varnish
  • Preparation method for water-based acrylic acid modified alkyd emulsion and its amino baking varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Acrylic Prepolymer A1:

[0043] Put 400 kg of dehydrated castor oil fatty acid into the reaction kettle, and gradually heat up to 135°C--145°C under stirring; add 200 kg of methyl methacrylate, 200 kg of isobutyl methacrylate, 60 kg of styrene, 120 Mix one kilogram of methacrylic acid and 20 kilograms of tert-butyl peroxybenzoate evenly and put it into the drop liquid high level tank, and use a constant flow pump to drop it into the reaction kettle for 6--8 hours; , kept at 135°C-145°C for 3-4 hours, until the conversion rate was 98±1%, the acrylic acid prepolymer A1 was obtained, and the acid value was 156mgKOH / g.

Embodiment 2

[0045] Preparation of Acrylic Prepolymer A2:

[0046] Put 400 kg of linseed oil fatty acid into the reaction kettle, and gradually heat up to 135°C--145°C under stirring; add 140 kg of methyl methacrylate, 180 kg of isobutyl methacrylate, 60 kg of vinyltoluene, 200 kg Mix one kilogram of methacrylic acid and 20 kilograms of di-tert-butyl peroxide evenly and put it into the drop liquid high level tank, and use a constant flow pump to drop it into the reaction kettle for 6-8 hours; , kept at 135° C.-145° C. for 3-4 hours, until the conversion rate was 98±1%, and the acrylic acid prepolymer A2 was obtained, and the acid value was 210 mgKOH / g.

Embodiment 3

[0048] Preparation of Acrylic Prepolymer A3:

[0049] Put 400 kg of linseed oil fatty acid into the reaction kettle, and gradually heat up to 135°C--145°C under stirring; add 150 kg of n-butyl methacrylate, 70 kg of styrene, 160 kg of vinyltoluene, 200 kg of methyl Acrylic acid and 20 kilograms of tert-butyl peroxybenzoate are mixed evenly and put into the drop liquid high level tank, and are added dropwise in the reactor with a constant flow pump, and the drop time is 6--8 hours; ℃--145 ℃ for 3-4 hours, until the conversion rate is 98±1%, the acrylic acid prepolymer A3 is obtained, and the acid value is 210mgKOH / g.

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Abstract

The invention relates to a water-based acrylic acid modified alkyd emulsion, the synthetic formula of which consists of the following components (by weight percentage): 9%-11% of diol or polyol; 9%-11% of polycarboxylic acid or anhydride; 0.01%-0.2% of a catalyst; 14%-19% of unsaturated fatty acid; 4%-6% of (methyl) acrylic ester or a vinyl monomer; 2%-4% of methacrylic acid; 0.1%-0.5% of an initiator; 4%-6% of a cosolvent; 1.5%-2.5% of a neutralizing agent; and 45%-55% of deionized water. The water-based alkyd amino baking varnish based on the water-based acrylic acid modified alkyd emulsion involved in the invention has the advantages of: (1) good storage stability; (2) good self-crosslinking; (3) excellent water resistance and rust resistance; and (4) safe and convenient use.

Description

technical field [0001] The invention relates to a preparation method of a water-based acrylic modified alkyd emulsion, and at the same time, also relates to a preparation method of preparing a water-based alkyd amino baking varnish by using the acrylic modified alkyd emulsion as a base material. Background technique [0002] Alkyd resin is one of the earliest developed, largest and most widely used varieties of paint synthetic resins. Alkyd resin has good film-forming performance and high gloss of the coating film, but its coating film has low hardness, poor water resistance and weather resistance. In order to improve the performance of alkyd resin, acrylic acid can be used to modify alkyd resin. Use acrylic acid to modify alkyd resin to prepare acrylic modified alkyd resin, which can make alkyd resin have excellent gloss and color retention, weather resistance, durability and corrosion resistance, fast drying, high hardness and other advantages . [0003] With the enhanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G63/49C08G63/91C09D187/00C09D167/08C09D161/32
Inventor 葛志有葛春葛民徐怡瑾
Owner JIAXING QINGHE GAOLI INSULATION MATERIAL
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