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Polyacrylate grafted modified polyester water-based coating and preparation method thereof

A technology of polyacrylate and graft modification, applied in the direction of coating, etc., can solve the problems of poor compatibility, poor comprehensive performance of cured paint film of compound coating, and low polarity

Active Publication Date: 2014-02-05
GUANGDONG YATU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of highly polar ester bonds in the main chain of polyester macromolecules, while the main chain of polyacrylate macromolecules is only composed of carbon-carbon bonds, its polarity is low, resulting in poor thermodynamic compatibility between the two and tends to Due to phase separation, the overall performance of the cured paint film of the compound coating is significantly deteriorated

Method used

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  • Polyacrylate grafted modified polyester water-based coating and preparation method thereof
  • Polyacrylate grafted modified polyester water-based coating and preparation method thereof
  • Polyacrylate grafted modified polyester water-based coating and preparation method thereof

Examples

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preparation example Construction

[0034] The preparation of polyacrylate graft modified polyester water-based coating is carried out in three steps. The first step is to synthesize water-dispersed polyester resin, and the second step is to carry out solution graft copolymerization of water-dispersed polyester resin and acrylate monomer and styrene monomer to synthesize water-dispersed acrylate graft modified The third step is the preparation of water-based paint and its cured paint film.

[0035] Table 1 is the names of raw materials used in the synthesis of water-dispersible polyester resins and their dosage ranges; Table 2 is the names of raw materials used in the synthesis of water-dispersible polyacrylate graft-modified polyester resins and their dosage ranges. Table 3 and Table 4 are the basic formulations of the synthetic water-dispersible polyester resin and the synthetic water-dispersible polyacrylate graft-modified polyester resin, respectively. Among the monomers used in the synthesis of water-dispe...

Embodiment 1

[0051] This embodiment is to provide in the stage of synthesizing water-dispersible polyester resin, the performance of the consumption of depolymerizing agent trimellitic anhydride to water-dispersible polyester resin, water-dispersible polyacrylate graft modified polyester resin and its water-based coating and curing effect on the properties of the paint film.

[0052] The preparation process of the water-dispersed polyacrylate graft-modified polyester water-based coating is carried out in three steps. The first step is to synthesize water-dispersed polyester resin, the second step is to synthesize water-dispersed polyacrylate graft-modified polyester resin, and the third step is to prepare water-based paint and its cured paint film.

[0053] Synthesis of the first water-dispersed polyester resin

[0054] The amount of the same monomer was fixed, and different amounts of depolymerization end-capping agent trimellitic anhydride were added in the late stage of the co-condensa...

Embodiment 2

[0075] This example is to provide the effect of the amount of glycidyl tertiary carbonic acid ester on the performance of water-dispersed polyacrylate graft modified polyester water-based paint and its cured paint film in the stage of synthesizing water-dispersed polyester resin.

[0076] Synthesis of the first water-dispersed polyester resin

[0077] Table 10 is the formula for synthesizing water-dispersible polyester under the condition of changing the amount of glycidyl tert-carbonic acid ester and keeping the amount of other similar monomers including trimellitic anhydride constant.

[0078] According to the formula ingredients in Table 10, carry out the co-condensation reaction according to the technical process of the first step of Example 1, and synthesize the water-dispersible polyester. It can be seen from Table 10 that when the amount of glycidyl tert-carbonate is in the range of 0-3.6%, the formed water-dispersed polyester resin has a uniform and transparent appeara...

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Abstract

The invention discloses a preparation method of a polyacrylate grafted modified polyester water-based coating. The preparation method is as follows: first, selecting a dihydric alcohol and a dibasic acid for a copolycondensation reaction at 240 DEG C for synthesis of a polyester with grafting activity, then adding the dibasic acid or a polybasic acid for polyester depolymerization and end capping for synthesis of water-dispersible polyester resin, then dissolving the water-dispersible polyester resin with a water soluble cosolvent, at 105 DEG C dropping a mixed liquid of a functional monomer, an acrylate monomer, a styrene monomer and an organic peroxide initiator for a free radical grafting copolymerization reaction for synthesis of a solution of water-dispersible-type polyacrylate grafted modified polyester resin with a water-dispersible main chain and a water-soluble graft chain, adding an amine neutralizer for neutralizing the solution of the water-dispersible-type polyacrylate grafted modified polyester resin, mixing the neutralized solution of the polyacrylate grafted modified polyester resin with an amino resin curing agent or an aziridine curing agent, a coating additive and deionized water for preparation of the polyacrylate grafted modified polyester water-based coating. The polyacrylate grafted modified polyester water-based coating has the advantages of a polyester coating and a polyacrylate coating, and is high in cured paint film glossiness and strong in water resistance.

Description

technical field [0001] The invention relates to a polyacrylate graft modified polyester water-based coating and a preparation method thereof, belonging to the field of organic polymer materials. Background technique [0002] Due to the deterioration of the ecological environment, more and more attention has been paid to environmental protection. Solvent-based coatings contain a large amount of volatile organic compounds (VOC), which not only pollute the environment, waste resources, but also endanger human health. my country and other countries in the world have formulated relevant laws and regulations to strictly limit the emission of VOC in coatings. Low-pollution water-based coatings, light-curing coatings, powder coatings and high-solid coatings have become the development direction of the coatings industry. Compared with other low-pollution coatings, water-based coatings have become a variety that is being developed in the field of coatings production due to their adv...

Claims

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Application Information

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IPC IPC(8): C09D151/08C09D7/12C08F283/02
Inventor 阮伟明张育波黄松王炼石施沃成伍祺卓冯兆华
Owner GUANGDONG YATU CHEM
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