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A kind of water-soluble polyester resin with hydroxy acid end cap and preparation method thereof

A technology of water-soluble polyester and hydroxy acid, applied in the field of polyester resin, can solve the problems of unstable cost and poor storage stability of polyester aqueous dispersion.

Active Publication Date: 2018-06-26
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101215730, CN101469108, etc. use carbodiimide or tertiary carbonic acid glycidyl ester to improve the hydrolysis resistance of polyester, but carbodiimide and glycidyl ester easily lead to unstable polyester aqueous dispersion and high cost during storage
[0007] At present, polyester resin aqueous dispersions generally have poor storage stability, and the hydrolysis resistance, water resistance and coating processability need to be improved to overcome the technical bottlenecks of the above resin performance and develop stable water-soluble resins with excellent comprehensive properties. Polyester resin has important environmental protection significance and market value

Method used

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  • A kind of water-soluble polyester resin with hydroxy acid end cap and preparation method thereof
  • A kind of water-soluble polyester resin with hydroxy acid end cap and preparation method thereof
  • A kind of water-soluble polyester resin with hydroxy acid end cap and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 2340 parts of dimethylpropanediol, 192 parts of 2-ethyl-2-butylpropanediol, 210 parts of trimethylolpropane, 89 parts of ethylene glycol to a reaction kettle equipped with a stirrer, reflux condenser and thermometer Alcohol and 130 parts of 1,4-cyclohexanedicarboxylic acid, 2510 parts of isophthalic acid, 1623 parts of adipic acid, and 9 parts of dibutyltin oxide were heated from room temperature to 140 ℃, raise the temperature of the reaction system from 140 ℃ to 240 ℃ at a rate of 8 ℃ per hour for esterification reaction, keep at 240 ℃ for 1.5 hours, the total esterification reaction time is 8 hours, and the acid value is less than 50mgKOH / g , adjust the vacuum degree of the reactor to be -0.1~-0.12MPa to carry out the polycondensation reaction. After 1 hour, the acid value of the reactant is 40mgKOH / g, the hydroxyl value is 30~50mgKOH / g and the number average molecular weight is 3000~5000, and the polyester is obtained. carboxyl-terminated prepolymer. Cool the r...

Embodiment 2

[0054]Add 1300 parts of dimethylpropanediol, 1527 parts of 2-ethyl-2-butylpropanediol, 129 parts of trimethylolpropane, 310 parts of 1,6-hexanediol and 426 parts of 1 , 4-cyclohexanedicarboxylic acid, 2573 parts of isophthalic acid, 1000 parts of terephthalic acid, 453 parts of hexahydrophthalic anhydride, and 12 parts of tetra-n-butyl titanate, with nitrogen gas constantly stirring Under normal circumstances, heat from room temperature to 140°C, raise the temperature of the reaction system from 140°C to 240°C at a rate of 8°C per hour for esterification reaction, reach 240°C for 1.5 hours, and the total esterification reaction time is 8.5 hours. When the acid value is less than 50mgKOH / g, adjust the vacuum degree of the reactor to -0.11~-0.13MPa for polycondensation reaction. After 1 hour, the acid value of the reactant is 35mgKOH / g, the hydroxyl value is 30~50mgKOH / g and the number average molecular weight is 3000~5000 to obtain polyester carboxyl-terminated prepolymer. Coo...

Embodiment 3

[0056] Add 1990 parts of 2-methyl-1,3-propanediol, 100 parts of 2-ethyl-2-butylpropanediol, 78 parts of ethylene glycol, 273 parts of 1,6-hexanediol to the above reaction kettle With 1535 parts of dodecanedioic acid, 1000 parts of isophthalic acid, 1873 parts of 1,6-adipic acid, 178 parts of trimellitic anhydride, and 15 parts of dibutyltin oxide, from room temperature under constant stirring with nitrogen Heating to 140°C, raising the temperature of the reaction system from 140°C to 240°C at a rate of 8°C per hour for esterification reaction, reaching 240°C for 2 hours, the total esterification reaction time is 10 hours, and the acid value is less than 50mgKOH / g, vacuuming and adjusting the vacuum degree of the reactor to -0.09~-0.1MPa for polycondensation reaction, 1.5 hours until the acid value of the reactant is 30mgKOH / g, the hydroxyl value is 30~50mgKOH / g and the number average molecular weight is 3000~5000, A polyester carboxyl-terminated prepolymer is obtained. Cool d...

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Abstract

The invention discloses water-soluble polyester resin with a hydroxy acid capping end. The water-soluble polyester resin is obtained by end capping of a polyester-terminated carboxyl prepolymer with the acid value of 5-50 mgKOH / g, the hydroxyl value of 1-10 mgKOH / g and the number-average molecular weight of 2,000-6,000 and an end capping agent hydroxy acid monomer; the glass transition temperature of the water-soluble polyester resin is 50-60 DEG C, the melting viscosity is 1,000-8,000 mPa.s at the temperature of 200 DEG C, the acid value is 10-40 mgKOH / g, the hydroxyl value is 5-100 mgKOH / g, the ratio of the acid value to the hydroxyl value is 1 / 2-1 / 0.8, and the number-average molecular weight is 5,000-15,000. The invention further discloses a preparation method of the water-soluble polyester resin. The water-soluble polyester resin is stable in storage, hydrolysis-resistant, flexible, weather-resistant and good in adhesion and coating workability for a base material.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a water-soluble polyester resin with hydroxyl acid end capping, and also to a preparation method of the polyester resin. Background technique [0002] Polyester resin is prepared by the esterification and polycondensation reaction of polybasic acid and polyol. By adjusting the monomer type and formulation process, the synthesized polymer structure has controllable hydroxyl and carboxyl groups, polyethylene oxide chain segments and Functional groups such as double bonds, the resin not only has good adhesion to the substrate and film workability, but also has mechanical properties and weather resistance, and is conducive to the use of acrylic resin, epoxy resin and fluorosilicone resin to obtain special properties. , Polyester has a wide range of applications. [0003] At present, polyester resins are mainly used as solvent-based polyester resins in the fields of coatings, inks, adhesives, ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/60C08G63/78C08G63/85C09D167/04C09D7/61C09D7/63
CPCC08G63/60C08G63/78C08G63/85C08K3/22C08K2003/2241C09D7/61C09D7/63C09D167/04
Inventor 陆均杰许振阳李勇陈唯胡百九顾宇昕
Owner GUANGZHOU KINTE IND
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