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Preparation method for waterborne acrylic acid modified epoxy ester emulsion and its amino baking varnish

A water-based acrylic and amino baking paint technology, used in epoxy resin coatings, coatings, etc., can solve the problems of poor water resistance and corrosion resistance of paint films, slow drying and hardness of paint films, and difficult to control the reaction process, and achieve glossy The effect of improving dryness and water resistance, and easy control of product quality

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 epoxy ester 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 gelation is prone to occur; (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 will not be greatly improved due to the lack of unsaturated double bonds; (3) The acid value of the resin is high, and the water resistance of the paint film and poor corrosion resistance; (4) There are more residual monomers and higher toxicity
Although this method overcomes the disadvantages of poor water resistance and corrosion resistance of the water-based epoxy ester emulsion prepared by the traditional vinyl modification method, and the dryness of the paint film and the slow increase in hardness, there are more residual monomers, and the odor and toxicity are relatively high. Big

Method used

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  • Preparation method for waterborne acrylic acid modified epoxy ester emulsion and its amino baking varnish
  • Preparation method for waterborne acrylic acid modified epoxy ester emulsion and its amino baking varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of Acrylic Prepolymer A1:

[0041] 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

[0043] Preparation of Acrylic Prepolymer A2:

[0044] Put 400 kg of linseed oil fatty acid into the reaction kettle, and gradually heat up to 135°C--145°C under stirring; put 150 kg of isobutyl methacrylate, 230 kg of vinyl toluene, 200 kg of methacrylic acid and 20 kg of After the oxidized di-tert-butyl ether is mixed evenly, put it into the dripping high-level tank, and use a constant-flow pump to drip it into the reaction kettle. The dropping time is 6--8 hours; Keeping it warm for 3-4 hours until the conversion rate is 98±1%, the acrylic acid prepolymer A2 is obtained with an acid value of 210 mgKOH / g.

Embodiment 3

[0046] Preparation of Acrylic Prepolymer A3:

[0047] 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 waterborne acrylic acid modified epoxy ester emulsion, the synthetic formula of which consists of the following components (by weight percentage): 12%-17% of epoxy resin; 14%-19% of unsaturated fatty acid; 4%-6% of a (methyl) acrylic ester or 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 waterborne epoxy ester amino baking varnish based on the waterborne acrylic acid modified epoxy ester emulsion involved in the invention adopts water as the diluent, takes the pigment and filler that both are free of harmful lead or chromium compound, has no risk of combustion, explosion, poisoning and environmental pollution, and is safe and environment friendly. The amino baking varnish can employ brush coating, spray coating, dip coating and other construction methods.

Description

technical field [0001] The invention relates to a method for preparing a water-based acrylic modified epoxy ester emulsion, and also relates to a method for preparing a water-based epoxy ester amino baking varnish with excellent antirust performance by using a water-based acrylic modified epoxy ester emulsion. Background technique [0002] According to statistics, more than 1 million tons of organic solvents are discharged into the atmosphere every year in my country's paint coating industry, which not only causes a lot of waste of organic solvents, but also causes serious pollution to the environment. In order to save resources and protect the environment, people have turned their attention to non-pollution or low-pollution water-based coatings. [0003] Epoxy ester resins are widely used in the field of metal protection due to their excellent mechanical properties and antirust properties. Epoxy ester resin is made by esterification reaction of epoxy resin and vegetable oi...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G59/14C08F220/64C08F220/14C08F220/18C08F220/06C08F212/08C08F236/20C08F212/06C08G59/16C09D163/10C09D161/32
Inventor 葛志有葛春葛民徐怡瑾
Owner JIAXING QINGHE GAOLI INSULATION MATERIAL
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