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Modified polyester resin and preparation method and application thereof

A technology for modifying polyester and polyester resin, applied in the field of coatings, which can solve the problems of decreased storage stability of water-based polyester resin coatings, poor storage stability of water-based coating products, and high surface tension, so as to achieve good storage stability and improve storage Stability, effect of simple storage conditions

Active Publication Date: 2020-12-18
湖南湘江关西涂料(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in water-based coatings, the dispersion medium water has the characteristics of high surface tension and high polarity, and has poor compatibility with the dispersion resin of the pigment, which is not conducive to the wetting and dispersion of the pigment.
Therefore, compared with solvent-based paints, pigment particles in water-based paints are more prone to agglomeration, flocculation, etc., resulting in poorer storage stability and shorter shelf life of water-based paint products
In practical application, the storage of water-based color paste or water-based paint is prone to thickening, floating color, sinking and other phenomena, which will not only affect the appearance and performance of the coating film, but will further gel and lead to deterioration and scrapping
[0003]Water-based polyester has gradually become an important direction for the development of water-based resins due to its safety, reliability, and good compatibility. However, polyester resin molecular chains contain a large number of ester bonds , It is easy to hydrolyze and disconnect in the water dispersion system, resulting in a decrease in the storage stability of the water-based polyester resin coating, and because the water-based coating is weakly alkaline, the carboxylic acid generated by the hydrolysis of the ester group and the amine pH regulator in the water-based coating The reaction further promotes the hydrolysis reaction, which leads to the decline of the water resistance, light resistance, aging resistance and corrosion resistance of the coating after the polyester coating is cured.
Moreover, the hydrolysis of the polyester resin will lead to a decrease in the molecular weight of the polyester resin and a decrease in the pH value of the coating, which will lead to a decrease in the dispersibility of the polyester resin to pigments and fillers, resulting in delamination of the coating, floating water, sinking of the pigment, and even deterioration, scrapping, and clogging. Bad phenomena such as paint circulation pipes

Method used

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  • Modified polyester resin and preparation method and application thereof
  • Modified polyester resin and preparation method and application thereof
  • Modified polyester resin and preparation method and application thereof

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preparation example Construction

[0064] One embodiment of the present invention also provides a method for preparing a modified polyester resin, comprising the following steps S10-S20.

[0065] Step S10: performing polycondensation reaction of at least two polyols and at least two polybasic acids to obtain a polyester resin;

[0066] Wherein, at least one of the above-mentioned at least two polybasic acids is selected from fatty dimer acids with 30 to 60 carbon atoms; based on the total mass of polybasic acids, fatty dimer acids with 30 to 60 carbon atoms The mass percentage is 5%-35%; at least one of the above-mentioned at least two polyols contains branched chains with 1-4 carbon atoms.

[0067] In some embodiments of the cycle, the reaction condition of the above polycondensation reaction is: react at 200°C-250°C for 4h-6h.

[0068] It can be understood that the polycondensation reaction method for synthesizing polyester can be any one of methods such as solvent azeotropic dehydration method, melt polycon...

specific Embodiment

[0093] Here are examples of the modified polyester resin according to the present invention, its preparation method and application, but the present invention is not limited to the following examples.

[0094] Unless otherwise specified, all raw materials used are commercially available products.

Embodiment 1

[0096] 2.80 parts of trimethylolpropane, 10.14 parts of 1,6-hexanediol, 8.39 parts of 2-butyl-2-ethyl-1,3-propanediol, 12.87 parts of adipic acid, 7.24 parts of isophthalic acid, 1.75 parts of dimer acid and 0.52 parts of maleic anhydride are placed in a reactor equipped with a thermometer, a thermostat, a stirrer, a heating device and a rectification tower, and the temperature is raised to 160°C under the protection of nitrogen, and the mixer is started when the materials start to melt Mix on low speed. Then, the temperature was raised to 230°C at a constant speed in 4 hours, and after the heat preservation polycondensation reaction for 1.5 hours, the rectification tower was switched to a water separator, and 1.75 parts of toluene was added to disperse into a polyester solution. Stop feeding nitrogen, turn on the vacuum device to remove by-product water, cool down to below 80°C and discharge, the acid value of the obtained polyester solution is 4.6mgKOH / g, and the number aver...

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Abstract

The invention relates to modified polyester resin as well as a preparation method and an application thereof. The modified polyester resin is prepared from the following raw materials: polyester resin, an acrylic monomer, an initiator, a neutralizer, a diluent and water, wherein the polyester resin is mainly prepared from polyhydric alcohol and polybasic acid; wherein the polybasic acid comprisesat least two kinds, at least one kind of polybasic acid is selected from fatty dimer acid with the carbon atom number of 30-60, and the mass percent of the fatty dimer acid with the carbon atom numberof 30-60 is 5%-35% on the basis of the total mass of the polybasic acid; the polyhydric alcohols comprise at least two kinds, and at least one kind of polyhydric alcohols contains a side group with the carbon atom number being 1-4. By adjusting the mass of the fatty dimer acid with the carbon atom number of 30-60, the ratio of long and short side groups in the modified polyester is adjusted and controlled, so that the hydrophilicity and hydrophobicity of the polyester resin are adjusted, the dispersity of the polyester resin in the water-based paint is improved, the dispersion efficiency of the pigment in the paint is improved, and the storage stability of the paint is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a modified polyester resin and its preparation method and application. Background technique [0002] In the field of coatings, only when pigments are uniformly and stably dispersed in the coating can the coating form a coating film with uniform color, stable size, smooth surface and excellent performance. However, in water-based coatings, the dispersion medium water has the characteristics of high surface tension and high polarity, and has poor compatibility with the dispersion resin of the pigment, which is not conducive to the wetting and dispersion of the pigment. Therefore, compared with solvent-based paints, pigment particles in water-based paints are more prone to agglomeration and flocculation, resulting in poorer storage stability and shorter shelf life of water-based paint products. In practical application, the storage of water-based color paste or water-based paint i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08F220/18C08F212/08C08F220/06C08G63/52C09D151/08C09D133/04C09D167/00C09D161/32
CPCC08F283/01C08G63/52C09D151/08C08F220/1808C08F212/08C08F220/06C08L33/04C08L67/00C08L61/32
Inventor 胡建康杨鹏飞张杰胡启明黄鹂董军胜
Owner 湖南湘江关西涂料(长沙)有限公司
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