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Acrylic emulsion and preparation method thereof

A technology of acrylic emulsion and solid acrylic acid, which can be used in inks, coatings, household utensils, etc., and can solve the problems of poor water resistance, high temperature sensitivity, and poor ethanol stability of coatings

Active Publication Date: 2021-09-10
山西省应用化学研究所(有限公司) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the poor ethanol stability of the acrylic emulsion existing in the prior art and the poor water resistance and high temperature sensitivity of the prepared coating, thereby providing an acrylic emulsion and its preparation method

Method used

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  • Acrylic emulsion and preparation method thereof
  • Acrylic emulsion and preparation method thereof
  • Acrylic emulsion and preparation method thereof

Examples

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preparation example Construction

[0020] The preparation method of above-mentioned acrylic acid emulsion comprises the following steps:

[0021] (1) Alkali-soluble solid acrylic resin with a molecular weight of 4000-12000 and an acid value of 170-250mgKOH / g and alkaline substances are dissolved in water at 60-80°C to form an alkali-soluble solid acrylic resin solution with a mass concentration of 30%;

[0022] (2) Add deionized water to the acrylic resin liquid obtained in step (1), add mixed monomers accounting for 5~10% of the total amount during the stirring process, and add NaHCO when the temperature rises to 70°C 3 and the initiator accounting for 30% of the total amount, keep warm at 80~85°C for 30-40 minutes;

[0023] (3) Add the remaining mixed monomers and 60% of the total amount of initiator at 80~85°C to the reactor dropwise within 3~4 hours; then add the rest of the initiator at 80~85°C Insulate and react at high temperature for 1-1.2 hours; naturally lower the temperature to 40-60° C., adjust the...

Embodiment 1

[0037] Take St 24.08g, BA 30.24g, HEMA 1.68g, as a mixed monomer for later use, take 0.50g K 2 S 2 o 8 , dissolved in 15.12g deionized water, and used as an initiator solution for subsequent use.

[0038] Add 24g Soluryl 70, 48g water, and 8g ammonia water (26%) into a 500 mL four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, raise the temperature to 65°C, and react for 1.5 h until the resin is completely dissolved. Add 48.9g of deionized water, stir well, add 2.8g of mixed monomers, stir fully at 500r / min for 20 minutes, start to heat up, at 70°C, add 4.69g of K 2 S 2 o 8 Aqueous solution, 0.112g NaHCO 3 , reacted for 30 minutes at 80°C (the emulsion appeared light blue, and when the reflux of the monomer was completed, the emulsion was milky white); then, added dropwise the remaining 53.2g mixed monomer and 9.38g K 2 S 2 o 8 Aqueous solution, add dropwise at a constant speed, the whole dropping process is controlled within 3~4 h; after ...

Embodiment 2

[0040] Take St 24g, BA 33g, N-methylolacrylamide 3g, as a mixed monomer for later use, take 0.54g K 2 S 2 o 8 , dissolved in 16.2g deionized water, and used as an initiator solution for subsequent use.

[0041] Into a 500 mL four-neck flask equipped with a stirrer, a thermometer and a reflux condenser, add 20 g of Soluryl 90, 40 g of water, and 6.7 g of ethanolamine, raise the temperature to 75°C, and react for 1.5 h until the resin is completely dissolved. Add 57.1g of deionized water, stir well, add 4.8g of mixed monomers, stir fully at 500r / min for 20 minutes, start to heat up, at 70°C, add 5g of K 2 S 2 o 8 Aqueous solution, 0.12g NaHCO 3 , react for 0.5 h at 80 ℃ (the emulsion appears light blue, and when the reflux of the monomer is completed, the emulsion is milky white); then, add the remaining 55.2g of mixed monomer and 10g of K 2 S 2 o 8 Aqueous solution, add dropwise at a constant speed, and the whole dropping process is controlled within 3~4 h to complete; ...

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Abstract

The invention relates to an acrylic emulsion and a preparation method thereof. The alkali-soluble solid acrylic resin and alkaline substances are dissolved in water to form an alkali-soluble solid acrylic resin liquid with a mass concentration of 30%; deionized water is then added, and during the stirring process Add 5~10% of the total mixed monomer, and when the temperature reaches 70°C, add NaHCO 3 and 30% of the total initiator, and keep it at 80~85°C for 30-40 minutes; control the remaining mixed monomer and 60% of the total initiator to react within 3~4 hours at 80~85°C. The dripping is completed in the kettle; then the remaining initiator is added and the reaction is insulated at 80-85°C for 1-1.2 hours; the temperature is naturally cooled to 40-60°C, and the pH is adjusted to 7-8 with ammonia water, and the above is obtained after filtration Acrylic lotion. The obtained acrylic emulsion has high ethanol stability and can overcome application problems such as poor water resistance and sensitivity to high and low temperatures in the coating.

Description

technical field [0001] The invention belongs to the field of water-based acrylic emulsion, in particular to an acrylic emulsion without emulsifier and a preparation method thereof. Background technique [0002] With the gradual strengthening of environmental protection awareness and regulations, acrylic emulsion has gradually become the main resin in the preparation of water-based varnishes, water-based inks, and water-based paints. The traditional acrylic emulsion polymerization is based on acrylic monomers dispersed in water or other solvents to form an emulsion under the action of a low molecular weight emulsifier for free radical polymerization. In this process, it is difficult to realize the transformation of acrylic acid polymerization from oil phase to water phase without suitable emulsifier. However, the use of emulsifiers also brings many problems to acrylic emulsions and the coatings made of them, such as storage stability, alcohol stability of alcohol solvents ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F212/08C08F220/20C08F220/58C08F220/06C08F2/22C09D133/08C09D125/14C09D11/30C09D11/107
CPCC08F220/18C08F212/08C08F2/22C09D133/066C09D133/24C09D133/064C09D125/14C09D11/107C09D11/30C08F220/1804
Inventor 吴建兵梁庆丰马小龙李萍刘伟郝静马国章
Owner 山西省应用化学研究所(有限公司)
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