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A kind of waterborne hyperbranched polyester resin and its preparation method and application

A technology of hyperbranched polyester and hydroxy polyester resin, applied in the direction of coating, can solve the problems of poor mechanical properties such as drying performance and hardness of the coating film, easy hydrolysis of water-based polyester, poor stability and other problems, and achieve the construction viscosity. Low, low molecular weight, high solids effect

Active Publication Date: 2022-01-25
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, the technical problem to be solved by the present invention is that water-based polyester is easily hydrolyzed in a weakly alkaline environment, and its stability is not good, and when water-based polyester is used to prepare water-based coatings, the mechanical properties such as film drying performance and hardness are relatively low. poor disadvantage

Method used

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  • A kind of waterborne hyperbranched polyester resin and its preparation method and application
  • A kind of waterborne hyperbranched polyester resin and its preparation method and application
  • A kind of waterborne hyperbranched polyester resin and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0039](1) Synthesis of the first generation of hyperbranched hydroxyl polyester resin: 10.56g of trimethylolpropane (0.078mol), 95g of dimethylol propionic acid (0.7089mol), and 3.0g of esterification catalyst were added to a four-necked flask , heat up to 145-150°C, and react for 180-210min. Determination of acid value, calculation of reaction degree;

[0040] (2) hyperbranched polyester resin grafted organic sulfonate: when (1) the degree of reaction reaches more than 90%, add 186.43g of trimethylolpropane and 35g of sodium sulfonate isophthalate, and continue to heat up to 180°C React for 1 hour, then raise the temperature to 200°C at a heating rate of 5°C / 10min, keep warm until the solution in the four-necked flask is transparent;

[0041] (3) Synthesis of modified water-based hyperbranched hydroxyl polyester resin: Add 192g of lauric acid and 200g of tetrahydrophthalic anhydride to the above solution (2), gradually raise the temperature to 210°C at a heating rate of 5°C / ...

Embodiment 2

[0043] (1) Synthesis of the first generation of hyperbranched hydroxyl polyester resin: 9.818g of trimethylolpropane (0.073mol), 88g of dimethylolpropionic acid (0.657mol), and 3.0g of esterification catalyst were added to a four-necked flask , heat up to 145-150°C, and react for 180-210min. Determination of acid value, calculation of reaction degree;

[0044] (2) hyperbranched polyester resin grafted organic sulfonate: when (1) reaction degree reaches more than 90%, add trimethylolpropane 117.19g, neopentyl glycol 91g, sodium sulfonate isophthalate 39g , continue to heat up to 180°C for 1 hour, then raise the temperature to 200°C at a heating rate of 5°C / 10min, keep warm until the solution in the four-necked flask is transparent;

[0045] (3) Synthesis of modified water-based hyperbranched hydroxyl polyester resin polyester: add coconut oil 156g, phthalic anhydride 165g, and isophthalic acid 52g in the above (2) solution, and gradually heat up at 5°C / 10min Raise the tempera...

Embodiment 3

[0047] (1) Synthesis of the first generation of hyperbranched hydroxy polyester resin: 8.41g of pentaerythritol (0.061mol), 98g of dimethylol propionic acid (0.7313mol), and 3.0g of esterification catalyst were added to a four-necked flask, and the temperature was raised to 145 -150°C, react for 180-210min. Determination of acid value, calculation of reaction degree;

[0048] (2) hyperbranched polyester resin graft organic sulfonate: when (1) degree of reaction reaches more than 90%, add pentaerythritol 99.59g, neopentyl glycol 58g, sodium sulfonate isophthalate 36g, continue to heat up to React at 180°C for 1 hour, then raise the temperature to 200°C at a heating rate of 5°C / 10min, keep warm until the solution in the four-necked flask is transparent;

[0049] (3) Polyester synthesis of modified water-based hyperbranched hydroxyl polyester resin: add palmitic acid 184g, tetrahydrophthalic anhydride 170g, isophthalic acid 55g in the above (2) solution, and gradually heat up at...

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Abstract

The invention relates to the technical field of synthetic polyester resins, and specifically discloses a water-based hyperbranched polyester resin and its preparation method and application. The preparation method includes the following steps: adding dihydroxymethyl propionic acid, an esterification catalyst and For some polyols, heat up to 140-150°C and keep warm for 3-3.5 hours to obtain the first generation of hyperbranched hydroxyl polyester resin; when the reaction degree reaches more than 90%, add polyols and organic sulfonates, and heat up to 180- 200°C, react until the solution in the container is transparent; then add monobasic fatty acids and dibasic acids, heat up to 200-220°C, when the acid value drops to 10-15mgKOH / g, stop heating, cool down, and add alcohol ethers Cosolvent dilution to obtain water-based hyperbranched polyester resin. The obtained polyester resin has good water solubility and high solid content, and the coating prepared by using it has low construction viscosity, good construction fluidity, thick film formed at one time, dense coating film and good physical and mechanical properties and chemical resistance.

Description

technical field [0001] The invention relates to the technical field of synthetic polyester resins, more specifically, to a water-based hyperbranched polyester resin and its preparation method and application. Background technique [0002] At present, the solid content of water-based paints in the paint market in my country is generally not high, and the film formation is thinner at one time, which increases transportation and construction costs; in addition, the use of water as a solvent (dispersion medium) makes the substrate wettability of water-based paints poor, reducing Fullness and gloss of the coating film; compared with solvent-based coatings, water-based coatings have relatively lower mechanical properties such as film hardness. [0003] At present, the methods of water-based polyester resins for coatings mainly include salt-forming methods and methods of introducing hydrophilic groups. The salt-forming method is to neutralize the carboxyl group in the macromolecula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C08G63/688C09D187/00
CPCC08G83/005C08G63/688C09D187/00
Inventor 刘迎新黄山余取民
Owner CHANGSHA UNIVERSITY
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