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Preparation method of photovoltaic level PVB resin

A resin and photovoltaic technology, which is applied in the field of preparation of photovoltaic grade PVB resin, can solve the problems of high water vapor transmission rate, power drop, affecting the performance and service life of photovoltaic modules, so as to improve the yield and purity, repetition rate and production The effect of high reliability

Active Publication Date: 2018-04-20
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The most commonly used packaging material for traditional photovoltaic modules is EVA (ethylene and vinyl acetate copolymer), which has good light transmission, flexibility, adhesion, operability and insulation, but the structure of the material is not dense enough, and water vapor is permeable. High conversion rate, unstable chemical structure, easy to degrade in ultraviolet environment, and there are tertiary hydrogen and acetate in the molecular structure, which are easy to be oxidized and hydrolyzed, resulting in yellowing, delamination, bubbles and Corrosion electrodes and other phenomena seriously affect the performance and service life of photovoltaic modules, leading to failure problems such as abnormal appearance of modules, power drop, discoloration of battery grid lines and snail lines

Method used

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  • Preparation method of photovoltaic level PVB resin
  • Preparation method of photovoltaic level PVB resin

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[0025] The invention provides a kind of preparation method of photovoltaic grade PVB resin, comprises the following steps:

[0026] A) butyraldehyde is dissolved in an organic solvent to obtain a butyraldehyde solution;

[0027] The organic solvent is one or more of n-hexane, epichlorohydrin, cyclohexane, dioxane, ether and n-butane;

[0028] The mass ratio of the butyraldehyde to the organic solvent is 1: (0.1-10);

[0029] B) Add 1 / 2 amount of acid solution and 1 / 2 amount of butyraldehyde solution dropwise in the PVA aqueous solution first, then add dropwise the remaining 1 / 2 amount of acid solution and the remaining 1 / 2 amount of butyraldehyde solution , to react under stirring conditions to obtain PVB resin.

[0030] In the present invention, the PVA resin (polyvinyl alcohol) is preferably dissolved in water at 80° C., and after the PVA resin is completely dissolved, return to room temperature to obtain an aqueous solution of PVA;

[0031] The PVA resin can be one or mo...

Embodiment 1

[0042]Weigh 100g of PVA1799 resin and dissolve it in 1kg of water at 80°C. After the PVA is completely dissolved, the solution returns to room temperature. Dissolve 60g of butyraldehyde in 300g of n-hexane, fully stir and dissolve evenly, add dropwise 0.8g of hydrochloric acid in the PVA aqueous solution, then dropwise add the n-hexane solution of butyraldehyde under the condition of full stirring, dropwise add to half, then add dropwise 0.8g of hydrochloric acid, and then drop the remaining butyraldehyde solution, vigorously stirred and reacted for 2 hours, PVB resin precipitated out in the mixed solution, washed with a small amount of water, and dried.

Embodiment 2

[0044] Weigh 1 kg of PVA1799 resin, dissolve it in 1 kg of water at 80°C, and return the solution to room temperature after the PVA is completely dissolved. Dissolve 60g of butyraldehyde in 300g of n-hexane, fully stir and dissolve evenly, add dropwise 55g of hydrochloric acid in the PVA aqueous solution, then dropwise add the n-hexane solution of butyraldehyde under the condition of sufficient stirring, dropwise add hydrochloric acid 58g, and then drop the remaining butyraldehyde solution, vigorously stirred and reacted for 2 hours, PVB resin precipitated out in the mixed solution, washed with a small amount of water, and dried.

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Abstract

The invention provides a preparation method of photovoltaic level polyvinyl butyral (PVB) resin. The preparation method comprises the following steps: (A) dissolving butyraldehyde in an organic solvent, so as to obtain a butyraldehyde solution, wherein the organic solvent is one or more of normal hexane, epoxy chloropropane, cyclohexane, dioxooctane, diethyl ether and normal butane, and the mass ratio of butyraldehyde to the organic solvent is 1 to (0.1-10); and (B) sequentially dropwise adding 1 / 2 of the amount of acid liquid and 1 / 2 of the amount of the butyraldehyde solution into a PVA water solution, then dropwise adding the rest acid liquid and the rest butyraldehyde solution, and stirring for reaction, so as to obtain the PVB resin. PVA and butyraldehyde are in contact at an interface of two solutions and are polymerized, and obtained PVB is directly separated out, so that the yield of PVB is increased, and the purity of the PVB is improved; and the light transmittance of a prepared PVB sandwich glass reaches above 87%, and the repetitive rate and the production reliability are very high.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic materials, in particular to a preparation method of photovoltaic grade PVB resin. Background technique [0002] In recent years, the research and development and industrialization of new solar photovoltaics have become a hot topic in the scientific and industrial circles, including: silicon cells, dye-sensitized photovoltaic cells, organic polymer thin-film cells, perovskite thin-film cells, etc. With the continuous improvement of the level, the photoelectric conversion efficiency of thin-film batteries can exceed 20%. The stability of devices has become a key technical bottleneck restricting the industrialization of new thin-film batteries. Although people use various means and technologies to improve the stability of photovoltaic devices, the actual In use, the stability and protection of the product also depend on the packaging of the battery. Only high-quality packaging can ensure that ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/28C08F16/06
CPCC08F8/28C08F16/06
Inventor 王世伟
Owner CHANGCHUN UNIV OF TECH