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Highly branched polyester product, thixotropic compound and coating

A product, polyester technology, applied in the direction of polyester coatings, coatings, etc., can solve the problems of weakened thixotropic performance, inconvenient preparation, etc., and achieve the effect of improving branching degree, strong thixotropic effect, and large three-dimensional space

Active Publication Date: 2022-04-05
优卡化学(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of weakened thixotropic performance and inconvenient preparation when the amount of thixotropic agent used in the prior art is limited, the present invention provides a highly branched polyester product, and the esterification polymerization components include carboxylic acid and lactone;

Method used

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  • Highly branched polyester product, thixotropic compound and coating
  • Highly branched polyester product, thixotropic compound and coating

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Add 254.15g (1mol) pyromellitic acid and 913.12g (8mol) ε-caprolactone into the reaction vessel, raise the temperature to 140°C, after the pyromellitic acid is completely dissolved, add 2000ppm tetraisobutyl titanate and The reaction was continued for 8 hours. Add 150g of polyethylene glycol (the number average molecular weight is 200, purchased from Clariant Polyglykol 200), gradually raise the temperature to 170°C, and carry out dehydration and esterification reaction for 16 hours under N2 purging to obtain the hyperbranched polyester product. The acid value was measured as 105.2mgKOH / g, Mn=5306, Mw=9326.

Embodiment 2

[0056] Add 192.12g (1mol) of citric acid and 456.56g (4mol) of ε-caprolactone into the reaction vessel, raise the temperature to 120°C, after the citric acid is completely dissolved, add 500ppm tetraisopropyl titanate and continue the reaction for 2 hours . Gradually raise the temperature to 170° C., under vacuum (pressure 300 Pa), perform dehydration and esterification reaction for 12 hours to obtain the hyperbranched polyester product. The acid value was measured as 179.6mgKOH / g, Mn=11486, Mw=21689.

Embodiment 3

[0058] Add 192.12g (1mol) citric acid and 1141.4g (10mol) ε-caprolactone into the reaction vessel, raise the temperature to 90°C, after the citric acid is completely dissolved, add 100ppm tetraisobutyl titanate and continue the reaction for 2 hours . Gradually raise the temperature to 170° C., and carry out dehydration and esterification reaction for 6 hours under N2 purging to obtain the hyperbranched polyester product. The acid value was measured as 96.8mgKOH / g, Mn=5186, Mw=7156.

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Abstract

The invention relates to the field of coating performance improvement, in particular to a highly branched polyester product, a thixotropic compound and a coating. According to the highly branched polyester product, esterification polymerization components comprise carboxylic acid and lactone; wherein the carboxylic acid is polyhydroxy acid at least containing two carboxyl groups and one hydroxyl group at the same time and / or polybasic carboxylic acid containing at least three carboxyl groups. The highly branched polyester provided by the invention is polymerized by using carboxylic acid and lactone as monomers, and the highly branched polyester and fumed silica form a more stable space structure, so that the highly branched polyester has remarkable thixotropic enhancement performance; meanwhile, the dosage range is large, synthesis is simple and convenient, raw materials are rich and easy to obtain, and good application and popularization value is achieved.

Description

technical field [0001] The invention relates to the field of coating performance improvement, in particular to a highly branched polyester product, a thixotropic compound and a coating. Background technique [0002] Coating rheology is an important property of coatings, which directly affects the appearance, construction performance and storage stability of coatings. The most commonly used index to reflect the rheological properties is the viscosity of the coating system. The viscosity decreases with the increase of the shear rate. Once the shear force disappears, the fluid whose viscosity recovers is called thixotropic fluid. [0003] This fluid characteristic has great practical significance in the paint industry, and the additives that can introduce this characteristic are called thixotropic agents. For oily systems, most thixotropes work by forming hydrogen bonds. For example, the surface of untreated fumed silica contains a large number of hydroxyl groups. They are v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/06C08G63/78C08G63/66C09D167/04C09D167/00C09D7/61
Inventor 范向群施丹王锋
Owner 优卡化学(上海)有限公司
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