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Preparation method of modified hydroxyl polyester resin

A hydroxyl polyester resin and modification technology, which is applied in the field of preparation of hydroxyl polyester resin, can solve the problems of coating loss, pulverization, adhesion drop, etc., and achieve the effect of expanding the application field

Active Publication Date: 2011-08-31
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These coatings can basically be used for a long time under the condition of lower than 120°C, but in the environment higher than 230°C, the coating will show loss of gloss, decreased adhesion, coating embrittlement, reduced flexibility, powdering, etc. and other damage phenomena, so that the coating loses its protective effect on the substrate

Method used

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  • Preparation method of modified hydroxyl polyester resin
  • Preparation method of modified hydroxyl polyester resin
  • Preparation method of modified hydroxyl polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a) Reaction process: In the synthesis kettle, raise the temperature of the kettle to 90-100°C, and put in 5.7kg of neopentyl glycol, 8.0kg of purified terephthalic acid, 0.15kg of trimethylolpropane, and 4.2kg of silicone resin in sequence , Monobutyl tin oxide 20g. After feeding the materials, seal the kettle and heat it up, and at the same time fill it with nitrogen for production protection. When the temperature rises to 245°C, maintain the reaction temperature for 2 hours. When the top temperature of the reaction kettle drops below 70°C, take samples for analysis. The acid value is 9-12mgKOH / g;

[0035] b) Curing process: lower the temperature of the kettle to 230°C, carry out vacuum operation, the vacuum degree of the reactor is less than -0.090MPa, react for 2 hours, control the acid value <5mgKOH / g, the viscosity is 0.3-0.5Pa.s, and lower the temperature of the kettle to Add 40g of dibutyltin dilaurate at 200-210°C, keep it for 30 minutes, and then stop the rea...

Embodiment 2

[0038] a) Reaction process: In the synthesis kettle, the temperature of the kettle was raised to 90-100° C., and 4.6 kg of neopentyl glycol, 0.10 kg of trimethylolpropane, and 4 kg of silicone resin were successively put in. After feeding the materials, seal the kettle and heat it up, and at the same time, fill it with nitrogen for production protection. When the temperature rises to 240°C, maintain the reaction temperature for 2 hours. When the top temperature of the reaction kettle drops below 70°C, take a sample for analysis. The sample is viscous and transparent;

[0039] Lower the temperature of the kettle to 225°C, put in 6.0kg of isophthalic acid and 14g of monobutyltin oxide, raise the temperature to 240°C, maintain the temperature for 3 hours, and take samples for analysis after the top temperature of the reaction kettle drops below 70°C. 8-10mgKOH / g;

[0040] b) Curing process: lower the temperature of the kettle to 220°C, carry out vacuum operation, the vacuum degre...

Embodiment 3

[0043] 5.0kg of neopentyl glycol, 5.0kg of silicone resin, and 6.3kg of isophthalic acid were added in the reaction step except a).

[0044]b) The curing process is: lower the temperature of the kettle to 215°C, carry out vacuum operation, the vacuum degree of the reactor is less than -0.090MPa, react for 1 hour, control the acid value <5mgKOH / g, the viscosity is 0.4-0.6Pa.s, and lower the temperature of the kettle Add 40g of dibutyltin dilaurate to 200-210°C, and keep it for 30 minutes before ending the reaction and discharging, the other procedures are the same as in Example 2.

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Abstract

The invention discloses a preparation method of modified hydroxyl polyester resin. The method comprises the working procedures of reaction, curing and mixing. The reaction working procedure comprises the following steps: rising the temperature of a synthesis kettle to 90-100 DEG C, adding neopentyl glycol, trimethylolpropane and organosilicon resin in turn, sealing the kettle after feeding, heating, filling nitrogen to perform production protection, heating to 240 DEG C, keeping the reaction temperature for 2 hours, reducing the temperature of the kettle to 225 DEG C, adding m / p-phthalic acid and butyltin oxide, heating to 240 DEG C, keeping the temperature to react for 3 hours, and reducing the top temperature of the reaction kettle to less than 70 DEG C to sample and analyze, wherein the acid value is 8-10mgKOH / g. Compared with the prior art, by adopting the preparation method, organosilicon resin can fully react; and the modified polyester is transparent, the condition that organosilicon resin is pale and milky when not reacted completely does not exist.

Description

Technical field: [0001] The invention relates to a preparation method of hydroxyl polyester resin, in particular to a preparation method of organosilicon-modified hydroxyl polyester resin. Background technique: [0002] Since the 1970s, with the development of industry, the pollution of the atmosphere caused by the coating construction of solvent-based coatings has become the focus of attention of the international community. Coatings are highly valued by the industry, and their proportion in the coatings industry has rapidly increased, and are widely used in household appliances, automobiles, aluminum profiles and other fields. Polyurethane powder coatings not only have high decorative properties and excellent physical and mechanical properties, but also have relatively comprehensive chemical resistance, especially not easy to yellow, weather resistance and light resistance are outstanding. It takes into account the advantages of epoxy coatings and acrylic coatings, and ha...

Claims

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Application Information

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IPC IPC(8): C08G63/695C08G63/78C09D175/06C09D5/03
Inventor 吴德清陈富生祝红广焦金牛
Owner ANHUI SHENJIAN NEW MATERIALS
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