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A kind of high and low temperature impact resistant flexible silicone modified polyester resin and preparation method thereof

A technology of modified polyester, high and low temperature resistance, applied in the field of coatings, can solve the problem that ordinary silicone-modified polyester resin cannot be used, and achieve the effects of excellent impact flexibility, good coating flexibility, and good temperature resistance.

Active Publication Date: 2021-02-05
中昊北方涂料工业研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible silicone-modified polyester resin resistant to high and low temperature impact and its preparation method, which can solve the problem that ordinary silicone-modified polyester resin cannot be used under the condition of lower than -100°C, and it can Long-term use in a wide temperature range of -180°C to 280°C, and the temperature can be changed alternately

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 120.0g deionized water into a 250ml three-neck flask, start stirring, control the stirring speed at 200-400r / min, and add ice cubes to the water bath to control the system temperature ≤ 25°C, and then add 34.2g dimethyl Dichlorosilane, 31.2g diphenyldichlorosilane, and 14.6g trimethyltrichlorosilane were evenly mixed and then added to a 100ml dropping funnel, and started to drop, controlling the dropping rate to be about 2 drops / 3 seconds, and continuously Add ice cubes to the water bath and control the reaction temperature to ≤25°C. During the process, the chlorosilane mixture will be added dropwise in 80-90 minutes, and then continue to control the temperature for 30 minutes. Pour the reaction product into a 1000ml separatory funnel and let it stand After the layers were separated, the lower layer was washed with a large amount of deionized water until the pH value was 7.

[0034] Add the washed solution into a 250ml three-neck flask, connect the distillation ...

Embodiment 2

[0039] (1) Add 240.0g deionized water into a 500ml three-neck flask, start stirring, control the stirring speed at 200-400r / min, and add ice cubes to the water bath to control the system temperature ≤ 25°C, and then add 68.4g dimethyl Dichlorosilane, 62.4g diphenyldichlorosilane, and 29.2g trimethyltrichlorosilane were mixed evenly and then added to a 250ml dropping funnel, and started to drop, controlling the dropping rate to be about 2 drops / 3 seconds, and at the same time continuously Add ice cubes to the water bath and control the reaction temperature to ≤25°C. During the process, the chlorosilane mixture will be added dropwise in about 1h40min~3h, and then continue to control the temperature for 30min. Pour the reaction product into a 1000ml separatory funnel and let After the layers were separated, the lower layer was washed with a large amount of deionized water until the pH value was 7.

[0040] Add the washed solution into a 500ml three-neck flask, connect the distill...

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Abstract

A flexible silicone modified polyester resin resistant to high and low temperature impact and a preparation method thereof, comprising the following steps: mixing dimethyldichlorosilane, diphenyldichlorosilane and trimethyltrichlorosilane and adding them dropwise to In ionized water, control the reaction temperature to always be ≤ 25°C. After the reaction, pour it into a separatory funnel. After standing for stratification, take the lower layer and wash it with water until the pH value is 7. After concentration, silanol is obtained; adipic acid and neopentyl glycol Heat until completely dissolved, then add xylene, heat to 170°C, 180°C, 190°C, 200°C respectively for reflux dehydration, if the measured acid value is ≤10, drop to room temperature and discharge to obtain adipic acid polyester; silanol After mixing with adipic acid polyester, grafting reaction at 180°C, 190°C, 200°C, 220°C respectively, stop the reaction when the measured gel point ≤ 100s, to obtain silicone modified polyester resin, which can be used in- It can be used for a long time in a wide temperature range of 180℃~280℃, and the temperature can be changed alternately, so its performance will not be affected. At the same time, its coating film has good flexibility and excellent impact flexibility.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a high-low temperature shock-resistant flexible silicone-modified polyester resin and a preparation method thereof. Background technique [0002] Polyester resins used in coatings are generally low molecular weight, amorphous, branched, crosslinkable polymers. It is generally formed by polyol and polybasic acid esterification, and has two structures: pure linear structure and branched structure. The paint film prepared by pure linear structure resin has better flexibility and processing performance; the paint film prepared by branched structure resin The hardness and weather resistance of the paint film are outstanding. At present, when using polyester resin, some other structures are usually introduced through chemical modification, which can make the polyester resin have properties that it does not have originally, to improve and highlight certain properties, and to meet sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/16C08G63/78C08G63/91
CPCC08G63/16C08G63/78C08G63/916
Inventor 谈珍李博文胡进奔吴津成
Owner 中昊北方涂料工业研究设计院有限公司
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