Solid polyester modified silicon resin for heat-resisting powder paints and preparation method thereof

A powder coating and polyester modification technology, which is applied in powder coatings, fireproof coatings, coatings, etc., can solve the problem of unsustainable development of solvent-based coatings due to environmental protection restrictions, lack of high-temperature-resistant powder coating film-forming temperature, powder solid polyester Resin high temperature difference and other problems, to achieve the effect of reasonable preparation process design, excellent high temperature resistance performance, high synthesis efficiency

Inactive Publication Date: 2017-10-17
江苏三木化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing solvent-based coatings cannot continue to develop due to environmental protection restrictions, and high-temperature-resistant powder coatings are bound to be a trend
The existing ordinary silicone resin has a low softening point, and it is prone to the problem of sticking back at room temperature, and there is a problem of poor high temperature resistance of powder solid polyester resin, and the high temperature resistance of ordinary polyester modified silicone resin is poor, and it does not have high temperature resistance. Problems such as film-forming temperature of powder coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method for the solid polyester modified silicone resin of high temperature resistant powder coating, it comprises the following steps:

[0024] (1) Preparation of polyester prepolymer

[0025] Take 230g of trimethylolpropane, 100g of octapentyl glycol, 210g of phthalic anhydride, 100g of trimellitic anhydride and 400g of pentaerythritol and add them to a three-necked flask, heat up, when the temperature rises to 80 degrees, start stirring, slowly heat up, and raise the temperature to To 230 degrees, the temperature of the distillation head in the whole reaction process should not exceed 105 degrees, take a sample to measure the acid value, stop heating when the acid value is 10 or below, cool down, dilute to 60% solid content and discharge, for later use

[0026] (2) Silicone intermediate: Mix 100g of monomethyltrichlorosilane, 200g of dimethyldichlorosilane, 500g of monophenyltrichlorosilane, 80g of diphenyldichlorosilane and 800g of propylene gly...

Embodiment 2

[0029] Embodiment 2 performance test

[0030] With 80 parts of solid polyester modified silicone resins obtained in Example 1, 20 parts of solid epoxy resins 604, 10 parts of high temperature resistant black pigment chrome copper black, 10 parts of talcum powder, 10 parts of mica powder, 7 parts of TGIC are mixed together, fully Stir and mix well, and raise the temperature to about 110 degrees to allow the solid polyester modified silicone resin and epoxy 604 to fully melt and solidify. After cooling, a dense and flat coating is formed, the coating thickness is 20-30 microns, and the coating is intact and glossy after being subjected to 550 degrees for four hours. There is no rust after 72 hours of salt spray test. It is proved that this solid polyester modified silicone resin has good high temperature resistance. Very good technical progress has been made.

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Abstract

The invention discloses a solid polyester modified silicon resin for heat-resisting powder paints and a preparation method thereof. The solid polyester modified silicon resin for the heat-resisting powder paints is obtained through reaction of a polyester prepolymer and a silicon intermediate, wherein the polyester prepolymer is prepared from trimethylolpropane, neopentyl glycol, phthalic anhydride, trimellitic anhydride and pentaerythritol; the silicon intermediate is prepared from methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilicane, diphenyl dichlorosilane and propylene glycol methyl ether acetate. The solid polyester modified silicon resin for the heat-resisting powder paints is prepared from the optimal raw material composition and ratio obtained by a large number of experiments; by optimizing synthesizing processes, the entire preparation process is reasonable in design and high in operability and synthesizing efficiency; the softening point of the prepared solid polyester modified silicon resin is around 90-105 DEG C, the heat-resisting powder paints prepared from the solid polyester modified silicon resin can resist high temperature of 55-650 DEG C and are excellent in heat-resisting performance, high in glossiness and wide in application range. The solid polyester modified silicon resin for the heat-resisting powder paints obtains high technical effects and overcomes the deficiencies in the prior art.

Description

technical field [0001] The invention relates to a powder coating, in particular to an environmentally friendly solid polyester-modified silicone resin for high-temperature-resistant powder coatings and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] The existing solvent-based coatings cannot continue to develop due to environmental protection restrictions, and high-temperature-resistant powder coatings are bound to be a trend. The existing ordinary silicone resin has a low softening point, and it is prone to the problem of sticking back at room temperature, and there is a problem of poor high temperature resistance of powder solid polyester resin, and the high temperature resistance of ordinary polyester modified silicone resin is poor, and it does not have high temperature resistance. The film-forming temperature of powder coatings and other issues. Contents of the invention [0003] Purpose of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/445C08G81/00C09D183/10C09D187/00C09D5/03
CPCC08G77/445C08G81/00C09D5/03C09D5/18C09D183/10C09D187/005
Inventor 钱锋薛中群惠正权蒋援斌
Owner 江苏三木化工股份有限公司
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