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Silsesquioxane modified bifunctional polyester resin and preparation method thereof

A silsesquioxane, bifunctional technology, applied in the field of polyester resin, can solve the problems of defects in storage stability, poor compatibility, large differences in solubility parameters between polyester resin and silsesquioxane, etc. Good performance, good resistance to organic solvents, and the effect of improving the phenomenon of polygel

Active Publication Date: 2020-11-27
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practitioners of powder coatings use the method of physical mixing of silsesquioxane and polyester resin to improve the high temperature resistance of powder coatings. This technical means has the characteristics of simple process and can slightly improve the high temperature resistance of powder coatings; the technical defect The solubility parameters of polyester resin and silsesquioxane are greatly different, the compatibility is poor, and the storage stability is defective

Method used

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  • Silsesquioxane modified bifunctional polyester resin and preparation method thereof
  • Silsesquioxane modified bifunctional polyester resin and preparation method thereof
  • Silsesquioxane modified bifunctional polyester resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0067] In a 1000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 90 parts of toluene, 90 parts of acetone mixed solvent, maintain the reaction temperature range of 0-3 ℃, and add 31.7 parts of Me 2 SiCl 2 , 47.4 parts of PhSiCl 3 , 20.9 Ph 2 SiCl 2 The prepared mixture; under stirring, use a constant pressure funnel to slowly drop 75 parts of deionized water, maintain the reaction temperature range of 42-45 ° C, stir for 0.5 h, let stand to separate layers, and exclude acid water; the organic layer is washed to neutral; The solvent was distilled off under reduced pressure, and cooled to room temperature for later use.

Embodiment b

[0069] In a 1000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 90 parts of toluene, 90 parts of acetone mixed solvent, maintain the reaction temperature range of 0-3 °C, and add 50.0 parts of Me 2 SiCl 2 , 20.0 parts PhSiCl 3 , 30.0 parts Ph 2 SiCl 2 The prepared mixture; under stirring, use a constant pressure funnel to slowly drop 75 parts of deionized water, maintain the reaction temperature range of 42-45 ° C, stir for 0.5 h, let stand to separate layers, and exclude acid water; the organic layer is washed to neutral; The solvent was distilled off under reduced pressure, and cooled to room temperature for later use.

Embodiment c

[0071] In a 1000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 90 parts of toluene, 90 parts of acetone mixed solvent, maintain the reaction temperature range of 0-3 ℃, and add 45.0 parts of Me 2 SiCl 2 , 20.0 parts PhSiCl 3 , 35.0 parts Ph 2 SiCl 2 The prepared mixture; under stirring, use a constant pressure funnel to slowly drop 75 parts of deionized water, maintain the reaction temperature range of 42-45 ° C, stir for 0.5 h, let stand to separate layers, and exclude acid water; the organic layer is washed to neutral; The solvent was distilled off under reduced pressure, and cooled to room temperature for later use.

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Abstract

The invention relates to silsesquioxane modified bifunctional polyester resin and a preparation method thereof. The invention discloses a silsesquioxane modified bifunctional polyester resin, which isobtained by melt phase polycondensation of the following raw materials (by weight): 20.0 to 55.0 percent of silsesquioxane, 25.0 to 40.0 percent of polyhydric alcohol, 25.0 to 50.0 percent of polyatomic acid, 4.0 to 18.0 percent of an acidolysis agent, 0.03 to 0.12 percent of a catalyst and 0.01 to 0.4 percent of a curing accelerator; the acid value of the silsesquioxane modified bifunctional polyester resin is 30.0 to 36.0 mg KOH / g; the hydroxyl value is 12.0 mgKOH / g to 22.0 mgKOH / g, the glass transition temperature is 66.0 DEG C to 76.0 DEG C, the rotary viscosity is 8,000 mPa.s / 200 DEG C to 18,000 mPa.s / 200 DEG C, and the number-average molecular weight is 8,000 to 18,000. The silsesquioxane modified bifunctional polyester resin for the high-temperature-resistant powder coating provided by the invention has dual properties of inorganic and organic compounds, and has the technical characteristics of good extinction property, good high-temperature resistance, good organic solvent resistance, good mechanical property and good adhesive force.

Description

technical field [0001] The invention relates to the field of polyester resins, in particular to a silsesquioxane modified bifunctional polyester resin, and also relates to a preparation method of the polyester resin. Background technique [0002] Powder coatings are composed of polyester resins, curing agents, pigments and fillers, and additives. Polyester resins account for more than 50% of powder coatings. Therefore, the performance of polyester resins determines the performance of powder coatings to the greatest extent. The film-forming properties of commercially available powder coatings The substance is a carbon heterochain compound, which has good mechanical properties, chemical resistance and adhesion, but poor high temperature resistance. [0003] Silsesquioxane is a silicon heterochain compound with good thermal stability. The side groups of silsesquioxane are mainly hydrogen bonds, methyl groups and phenyl groups. The hydrogen bonds are non-polar, the intermolecula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/695C08G77/04C09D167/06C09D5/03C09D7/63
CPCC08G63/6958C08G77/045C09D167/06C09D5/033C09D5/18C08K13/02C08K5/34924
Inventor 汤明麟童徐圆邱锋利应明友刘义邵盛君储坚刚徐忠根
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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