Hydroxyl-containing water-based acrylic ester polymer and preparation method thereof

A technology of hydroxyl-containing acrylate and water-based acrylate, applied in the direction of coating, etc., can solve the problems of difficulty in controlling molecular weight distribution, difficult recovery of solvent extraction, influence on appearance and performance of coating film, etc. Gloss and hardness, the effect of improving the overall performance

Active Publication Date: 2012-05-02
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the method of vacuuming is used to reduce the solvent content, but it is difficult to recycle the extracted solvent, the preparation cost is high, the extraction process is not easy to control, and it is easy to cause a sharp increase in viscosity or even gelation; Special initiators, chain transfer agents and co-solvents are used to reduce the molecular weight of the resin and the reaction viscosity to achieve the purpose of reducing the content of organic solvents by controlling certain reaction conditions. Although this method can effectively reduce the content of solvents, but at the expense of molecular weight For the price, the number average molecular weight is usually reduced to below 5000, and it is difficult to control the molecular weight distribution during the synthesis process, so it has a great impact on the appearance and performance of the coating film

Method used

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  • Hydroxyl-containing water-based acrylic ester polymer and preparation method thereof
  • Hydroxyl-containing water-based acrylic ester polymer and preparation method thereof
  • Hydroxyl-containing water-based acrylic ester polymer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] ① Preparation of specific hydroxyl-containing acrylate aqueous dispersion

[0027] 10-30 parts by weight of hydroxyl-containing acrylic monomer, 1-5 parts by weight of acrylic monomer, 20-50 parts by weight of alkyl acrylate monomer, 1-5 parts by weight of initiator, and 20-40 parts by weight of cosolvent Prepare the raw materials according to the formula of the part, and the specific formula is shown in Table 1;

[0028] Table 1

[0029]

[0030]

[0031] Add 100 parts by weight of co-solvent into the reaction vessel, stir and heat up to 100-110°C, then add dropwise the mixture consisting of the total amount of the monomer and 6 parts by weight of the initiator, the dropping time is 3h, and the dropping is completed Insulate for 0.5 to 1 hour, then add dropwise a mixture of the remaining initiator and the remaining co-solvent at 100 to 110°C, add dropwise for 0.5 to 1 hour, and then keep warm for 2 to 3 hours to obtain a hydroxyl-containing acrylate resin. Afte...

Embodiment 2

[0039] Basically the same as Example 1, the difference is: 2. when preparing the hydroxyl-containing water-based acrylate polymer, the amount of hydroxyethyl methacrylate is 49.5 parts by weight, methyl methacrylate is 61.5 parts by weight, and butyl acrylate is 39 parts by weight. parts by weight;

[0040] The particle size of the obtained hydroxyl-containing waterborne acrylate polymer is 130nm, the hydroxyl value is 138.2mgKOH / g, the acid value is 15.3mgKOH / g, the solid content is 48.5% (weight), and the solvent content<10% (weight) , the viscosity is 2600mpa.s, the number average molecular weight is 29438, the glass transition temperature is 32°C, and there is no change when stored at 50°C for 1 month.

Embodiment 3

[0042] ① Preparation of specific hydroxyl-containing acrylate aqueous dispersion

[0043] Basically the same as Example 1, the difference is: 9.2 parts by weight of acrylic acid, 34.8 parts by weight of methyl methacrylate, 92 parts by weight of butyl acrylate, and 10.8 parts by weight of dimethylethanolamine neutralizer;

[0044] The prepared specific hydroxyl-containing acrylate aqueous dispersion has a hydroxyl value of 133.6 mgKOH / g, an acid value of 34.7 mgKOH / g, a solid content of 36% (by weight), and a number average molecular weight of 9598;

[0045] ②Preparation of hydroxyl-containing waterborne acrylate polymer

[0046] Basically the same as Example 1, the difference is: 286.9 parts by weight of the specific hydroxyl-containing acrylate aqueous dispersion prepared by the method of step 1., 45 parts by weight of methyl methacrylate, 73 parts by weight of butyl acrylate, deionized water 67.8 parts by weight, wherein, the weight part ratio of the specific hydroxyl-cont...

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Abstract

The invention relates to a hydroxyl-containing water-based acrylic ester polymer and a preparation method thereof. The hydroxyl-containing water-based acrylic ester polymer is synthesized by two steps of: firstly, preparing a specific hydroxyl-containing acrylic ester aqueous dispersion; and secondly, carrying out free base polymerization on the specific hydroxyl-containing acrylic ester aqueous dispersion and 10-30 parts of hydroxyl-containing acrylic ester monomers, 30-50 parts of methacrylate monomers, 0.1-0.5 part of ammonium persulfate and/or potassium persulfate initiator and 30-50 parts of deionized water, wherein the percentage of Mn is mote than or equal to 10,000; the hydroxyl-containing water-based acrylic ester polymer has low content of solvent, high content of solid, low viscosity and low acid value; and the weight ratio of the specific hydroxyl-containing acrylic ester aqueous dispersion to the monomers and the initiator used for the free base polymerization with the specific hydroxyl-containing acrylic ester aqueous dispersion is 1:(1.40-2.0) counted according to the solid content. The hydroxyl-containing water-based acrylic ester polymer can be used for preparing a dual-component waterborne polymerization coating, or can be used for preparing a waterborne amino baking coating and has the advantages of high luster of a paint film, weather resistance, corrosion resistance, low VOC (Volatile Organic Compounds) and wide application range; and a preparation process is stable and controllable.

Description

technical field [0001] The invention relates to a hydroxyl-containing waterborne acrylate polymer and a preparation method thereof. Background technique [0002] Hydroxyl-containing waterborne acrylate polymers are widely used in the field of two-component waterborne polyurethane coatings and amino baking coatings due to their high gloss, good color retention, and good weather resistance. Hydroxyl-containing water-based acrylate polymers can be classified into emulsion type and water dispersion type according to the synthesis process. The former has high molecular weight and low solvent content, but has coarse particle size, low gloss of the coating film, and is compatible with amino resins. The defect of poor compatibility; the latter, the particle size is small, the coating film has higher gloss after curing, and has better compatibility with amino resins, etc., but the solvent content is higher, the viscosity of the aqueous dispersion is larger, Generally, only when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/06C08F220/14C08F220/18C08F220/28C08F220/06C08J3/03C09D151/00
Inventor 祝宝英胡中许飞庄振宇张汉青朱柯
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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