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Preparation method of water-borne acrylic resin

A water-based acrylic and resin technology, used in electrolytic coatings, electrophoretic plating, coatings, etc., can solve problems such as poor hydrophilicity, affecting coating curing, and insufficient stability, and achieve high adhesion, good decoration and weather resistance. The effect of excellent performance and curing performance

Inactive Publication Date: 2012-10-31
佛山科富科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary blocked isocyanate has poor hydrophilicity, and after being made into electrophoretic coatings, the stability is not good enough. When coating, the separation and curing agent cannot be deposited on the workpiece in the same amount as the acrylic resin, which affects the curing of the coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of blocked isocyanate

[0030] Weigh 222.0g of isophorone diisocyanate (IPDI) and 0.2g of dibutyltin dilaurate (DBTDL) into a four-necked flask equipped with a stirrer, reflux condenser, thermometer and dropping funnel, start stirring, and pre- Heat to 40°C, slowly add 74.0g n-butanol dropwise, and dropwise finish in about 0.5h. After reacting at a constant temperature of 40°C for about 2.5h-3h, measure the -NCO group content. When the -NCO group content is 50%, slowly add 130.0g hydroxypropyl acrylate (HPA) to react to 70°C and keep warm After 2 h, when the -NCO group content was measured to be 0, the temperature was lowered to 50 °C and the material was discharged. Obtain blocked isocyanate;

[0031] (2) Synthesis of acrylic resin

[0032] Weigh 30.0 g of dimethylaminoethyl methacrylate (DMAM), 36.0 g of butyl acrylate (BA), and 24.0 g of methyl methacrylate (MMA), stir evenly, and add 0.5 g of azobisisobutyronitrile. Add 60.0g of the blocked isocy...

Embodiment 2

[0044] (1) Preparation of blocked isocyanate

[0045] With embodiment 1;

[0046] (2) Synthesis of acrylic resin

[0047]Weigh 25.0 g of dimethylaminoethyl methacrylate (DMAM), 36.0 g of butyl acrylate (BA), and 24.0 g of methyl methacrylate (MMA), stir evenly, and add 0.4 g of azobisisobutyronitrile. Add 50.0 g of the blocked isocyanate curing agent and 25.0 g of ethylene glycol monobutyl ether prepared in the first step into a four-neck flask equipped with a stirrer, a thermometer, a condenser tube and a dropping funnel, and ventilate nitrogen, start stirring, and heat up To 75 ℃, start slowly dropwise adding 1 / 4 mixed monomer and 1 / 3 initiator azobisisobutyronitrile, pay attention to control the dropping speed and the temperature in the reaction bottle, after the dropping is completed, keep the reaction for 1 h, and raise the temperature to 80 ℃, slowly drop the remaining monomer, the dropping time is about 3 hours, completely dissolve the remaining initiator with ethylen...

Embodiment 3

[0059] (1) Preparation of blocked isocyanate

[0060] With embodiment 1;

[0061] (2) Synthesis of acrylic resin

[0062] Weigh 30.0 g of dimethylaminoethyl methacrylate (DMAM), 30.0 g of butyl acrylate (BA), and 30.0 g of methyl methacrylate (MMA), stir evenly, and add 0.5 g of azobisisobutyronitrile. Add 60.0 g of the blocked isocyanate curing agent and 30.0 g of ethylene glycol monobutyl ether prepared in the first step into a four-neck flask equipped with a stirrer, a thermometer, a condenser tube and a dropping funnel, ventilate nitrogen, start stirring, and heat up to 75°C, slowly add 1 / 2 of the mixed monomer and 1 / 3 of the initiator azobisisobutyronitrile dropwise, pay attention to controlling the dropping speed and the temperature in the reaction bottle, after the dropwise addition, keep the reaction for 1 h, and then heat up to 80 ℃, slowly drop the remaining monomer, the dropping time is about 2 hours, completely dissolve the remaining initiator with ethylene glyco...

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Abstract

The invention provides a preparation method of water-borne acrylic resin. The preparation method comprises the following steps of: (1) preparing blocked isocyanate; and (2) synthesizing acrylic resin, i.e., weighing 25-40 g of dimethylaminoethyl methacrylate, 25-40 g of butyl acrylate and 25-40 g of methyl methacrylate and uniformly stirring; adding 0.3-0.8 g of azo-bis-iso-butyrynitrile; adding 40-60 g of blocked isocyanate prepared by the first step and 20-30 g of ethylene glycol monobutyl ether into a flask provided with a stirrer, a thermometer, a condensing pipe and a dropping funnel; introducing nitrogen and stirring; heating to a temperature of 75+ / -1 DEG C; slowly dropwise adding 1 / 4 to all mixed monomer and 1 / 3-3 / 4 initiator azo-bis-iso-butyrynitrile; preserving the heat and reacting for about 1 hour after the dropwise addition is finished; slowly dropwise adding residual monomer for about 2-3 hours; fully dissolving the residual initiator with the ethylene glycol monobutyl ether; slowly dropwise adding into a reaction bottle for several times; controlling the temperature to be kept at a temperature of about 80 DEG C; preserving the heat and reacting for 1 hour; cooling to a temperature of 50 DEG C and discharging to obtain the water-borne acrylic resin. The resin has the advantages of simple preparation process, environmental friendliness, good storage stability and excellent curing performance.

Description

technical field [0001] The invention relates to a preparation method of cationic resin, in particular to a preparation method of cationic acrylate resin. Background technique [0002] Acrylic resin has outstanding characteristics such as light color of paint film, water white and transparent, excellent weather resistance, yellowing resistance, abrasion resistance, mildew resistance, high temperature and high humidity resistance, chemical resistance, gloss and color retention, etc. Widely used in industry. Traditional acrylic resins are only soluble in aromatic hydrocarbons, esters and alcohol organic solvents, and organic solvents are not only expensive, but also volatile and pollute the environment. Water-based acrylic resin has broad development prospects due to environmental protection and energy saving. [0003] Chinese patent CN101121770 discloses a method for preparing a water-based acrylic resin that is made into a resin emulsion through internal emulsification. Th...

Claims

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Application Information

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IPC IPC(8): C08F220/36C08F220/34C08F220/18C08F220/14C09D133/14C09D5/44C25D13/06
Inventor 钟萍渠美丽袁兴李丽君
Owner 佛山科富科技有限公司
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