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A kind of polyester polyol and preparation method thereof for solar backplane coating glue

A technology for solar backsheets and polyester polyols, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as difficult time duration, change of adhesive structure, etc., to reduce damage and prolong life , the effect of simple preparation method

Active Publication Date: 2022-05-13
湖北荆州华邦化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also possible to resist the influence of light by adding sunscreen, but adding a small amount does not work, and when it is increased to a certain amount, it will change the structure of the adhesive, and it is difficult to last in time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The polyol system consists of 20% (weight percent) 2,4-dihydroxybenzoic acid and 80% ethylene glycol.

[0026] Weigh quantitative 2,4-dihydroxybenzoic acid, ethylene glycol and adipic acid, and add them to a reaction kettle equipped with a thermometer, condenser and stirrer, wherein the molar ratio of ethylene glycol and adipic acid is 1:1.0 ; Flow nitrogen from the bottom of the kettle, heat slowly under the protection of nitrogen, start the agitator after the material melts; dehydrate when the temperature rises to 120~150°C, and finally heat up to 200~250°C for 12~48 hours; then under vacuum Continue the reaction. When the acid value is less than 0.4, start to lower the temperature. When the temperature drops to 120° C., filter and pack to obtain polyester polyol.

[0027] The obtained polyester polyol is reacted with isocyanate to form polyurethane. Compared with the one without 2,4-dihydroxybenzoic acid, the aging time of xenon arc lamp is irradiated according to AS...

Embodiment 2

[0029] The polyol system consists of 15% (by weight) 2,3,4-trihydroxybenzoic acid and 85% hexanediol.

[0030] Take quantitative hexanediol, 2,3,4-trihydroxybenzoic acid and phthalic acid and join in the reaction kettle equipped with thermometer, condenser and stirrer, wherein the molar ratio of phthalic acid and hexanediol The ratio is 1:1.5; pass nitrogen from the bottom of the kettle, heat slowly under the protection of nitrogen, start the agitator after the material melts; dehydrate when the temperature rises to 150°C, and react for 12 hours after finally raising the temperature to 200°C; then continue the reaction under vacuum , when the acid value is less than 0.4%, start to lower the temperature, filter and pack when the temperature drops to 120°C, and obtain polyester polyol.

[0031] The obtained polyester polyol is reacted with isocyanate to form polyurethane. Compared with that without 2,3,4-trihydroxybenzoic acid, the aging time of xenon arc lamp is irradiated acco...

Embodiment 3

[0033] In the polyol system, 2,3-dihydroxybenzoic acid and 3,4,5-trihydroxycinnamic acid are each 5%, and dipropylene glycol is 90%.

[0034] Weigh quantitative 2,3-dihydroxybenzoic acid, 3,4,5-trihydroxycinnamic acid, dipropylene glycol and phthalic anhydride and add them to a reaction kettle equipped with a thermometer, a condenser and a stirrer, Wherein the molar ratio of phthalic anhydride and dipropylene glycol is 1:1.2; pass nitrogen from the bottom of the kettle, heat slowly under the protection of nitrogen, start the agitator after the material melts; dehydrate when the temperature rises to 120 ℃, and finally heat up to React at 250°C for 48 hours; then continue to react under vacuum, start to lower the temperature when the acid value is less than 0.4, filter and pack when the temperature drops to 120°C, and obtain polyester polyol.

[0035] The obtained polyester polyol is reacted with isocyanate to form polyurethane. Compared with that without 2,3,4-trihydroxybenzoic...

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PUM

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Abstract

The invention relates to a polyester polyol and a preparation method thereof, specifically discloses a polyester polyol used for solar backboard coating glue and a preparation method thereof, aiming at solving the problem of the ultraviolet resistance of the existing polyurethane adhesive for solar backplane coating The problem of low performance. The polyester polyol includes a polyol system and a dibasic / polybasic acid. The polyol system contains at least one phenolic compound containing two or more phenolic hydroxyl groups and one carboxyl group, with a content of 1-20%. And it contains at least one dibasic / polyhydric alcohol with a content of 80-99%. The preparation method includes: putting the reactants into a reactor, heating to melt and stirring for reaction; dehydrating when the temperature rises to 120-150°C, raising the temperature to 200-250°C and reacting for 12-48 hours, cooling down and filtering to obtain polyester polyol . The invention is used for the polyester part of the polyurethane, and the obtained polyurethane adhesive can significantly reduce the damage of ultraviolet rays to the solar backboard and prolong its service life.

Description

technical field [0001] The invention relates to a polyester polyol and a preparation method thereof, in particular to a polyester polyol used for a solar backboard coating adhesive and a preparation method thereof. Background technique [0002] The solar backsheet is located on the back of the solar panel, which protects and supports the solar panels. A single material often cannot meet such comprehensive performance requirements. It is usually composed of multiple layers of polymer films with different structures. Generally, the PET film is coated with an adhesive, and then both sides are compounded with fluorine film (PVF, PVDF), or one side is compounded with fluorine film. , and the other side is compounded with PE-VA film or other film materials to make a multi-layer composite backplane. [0003] Adhesives are used to bond the layers of the solar backplane. Due to long-term exposure to outdoor light, it needs to face various environments, and high temperature treatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/60C08G63/78C08G18/42C09J175/06
CPCC08G63/60C08G63/78C08G18/4286C09J175/06
Inventor 胡钰新丁虫虫徐礼文李晓
Owner 湖北荆州华邦化学有限公司
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