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High-weather resistance polyester for bonding multilayer films of solar backing sheet, and synthesis method thereof

A solar backplane and multi-layer film technology, applied in the direction of adhesives, etc., can solve the problems of increasing the total reaction time, increasing energy consumption and production costs, and achieving the effects of low cost, improved weather resistance, and simple synthesis process

Active Publication Date: 2019-02-01
浙江乘鹰新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of heat stabilizers can also inhibit the polycondensation reaction while inhibiting the thermal degradation reaction, thereby increasing the total reaction time and increasing energy consumption and production costs.

Method used

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  • High-weather resistance polyester for bonding multilayer films of solar backing sheet, and synthesis method thereof
  • High-weather resistance polyester for bonding multilayer films of solar backing sheet, and synthesis method thereof
  • High-weather resistance polyester for bonding multilayer films of solar backing sheet, and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a kind of highly weather-resistant polyester used for solar backboard multilayer film bonding, and its preparation method comprises the following steps:

[0032] (1) Put 20kg of terephthalic acid, 40kg of isophthalic acid, 36kg of sebacic acid, 60kg of neopentyl glycol, 15kg of 2-methyl-2,4-pentanediol, and 14kg of 1,5-pentanediol into the reaction Stir and heat in the kettle at a temperature of 120°C to 140°C. After the material is melted, add 36g (the unit is g) of dihydroxybutyl tin chloride, and gradually raise the temperature to 220°C to 240°C for reaction. When it is measured that the lactonization rate in the kettle is more than 94%, start vacuuming, and gradually increase the vacuum until the hydroxyl value of the material in the kettle is 56±4mgKOH / g.

[0033] (2) Reduce the temperature in the kettle to below 160°C, put in 3kg of trimethylolpropane, gradually raise the temperature to 240°C, keep it warm for 2 hours, start vacuuming, an...

Embodiment 2

[0036] This embodiment provides a kind of highly weather-resistant polyester used for solar backboard multilayer film bonding, and its preparation method comprises the following steps:

[0037] (1) 17kg phthalic anhydride, 44kg isophthalic acid, 36kg sebacic acid, 58kg neopentyl glycol, 15kg 2,2,4-trimethyl-1,3-pentanediol, 12kg 1, Put 5-pentanediol into the reaction kettle and stir and heat at a temperature of 120°C to 140°C. After the material is melted, add 36g (the unit is g) of dihydroxybutyl tin chloride, and gradually raise the temperature to 220°C to 240°C for reaction. When it is measured that the lactonization rate in the kettle is more than 94%, start vacuuming, and gradually increase the vacuum until the hydroxyl value of the material in the kettle is 56±4mgKOH / g.

[0038] (2) Reduce the temperature in the kettle to below 160°C, put 5.1kg of pentaerythritol into it, gradually raise the temperature to 240°C and keep it warm for 2 hours, start vacuuming, and gradual...

Embodiment 3-7

[0041] Examples 3-7 respectively provide a kind of high weather resistance polyester used for solar backplane multilayer film bonding, and the specific components and contents are shown in Table 1; the preparation method is the same as that of Example 1.

[0042] Table 1

[0043]

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Abstract

The invention provides a high-weather resistance polyester for bonding multilayer films of a solar backing sheet, and a synthesis method thereof. Raw materials of the polyester comprise 15-49.49 wt% of a dicarboxylic acid or dicarboxylate monomer containing a cyclic structure, 15-25 wt% of a dicarboxylic acid free from the cyclic structure, 25-40 wt% of neopentylene glycol, 5-15 wt% of diol containing two or more asymmetric methyl groups, 5-15 wt% of diol containing one or no methyl group, 001-0.03 wt% of a catalyst and 0.5-5 wt% of a cross-linking agent. 2,2,4-trimethyl-1,3-pentanediol and other diols containing two or more asymmetric methyl groups are introduced, and the steric hindrance effect provided by side groups greatly improves the weather resistance of the polyester. Stepwise synthesis increases the content of the crosslinking agent, and the increase of the density of the network structure of the polyester greatly improves the weather resistance of the polyester.

Description

technical field [0001] The invention relates to the technical field of polyester backsheet adhesive, in particular to a highly weather-resistant polyester used for bonding multilayer films of solar backsheets 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 battery sheet, and has reliable insulation, water resistance, and aging resistance. The currently widely used solar backsheet has a three-layer structure (PVDF / PET / PVDF), the outer protective layer PVDF has good environmental erosion resistance, the middle layer is PET polyester film with good insulation properties, PVDF and PET pass through EVA (copolymer of ethylene and vinyl acetate) bonding. During the use of EVA glue, it will slowly change under the action of ultraviolet rays, high temperature, moisture and oxygen. The main phenomena are discoloration, oxidative fading, delamination and acetic acid productio...

Claims

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Application Information

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IPC IPC(8): C08G63/20C09J167/02
CPCC08G63/20C09J167/02
Inventor 董海普张钰馨王玉春吴奎
Owner 浙江乘鹰新材料股份有限公司
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