Bi-component composite adhesive for solar power back panel, and preparation method thereof

Abstract

The invention relates to a bi-component composite adhesive for a solar power back panel, and a preparation method thereof. The adhesive consists of a component A and a component B, wherein the component A mainly comprises dipropylene glycol, hydroxypivalyl hydroxypivalate, 2,4-diethyl-1,5-pentanediol, terephthalic acid, phthalic anhydride, 1,12-dodecanoic acid, a hydrolysis-resistant stabilizing agent, ethyl acetate and a small amount of organotin catalyst, and the component B is an aliphatic polyisocyanate curing agent; the weight ratio of the component A to the component B is (10-16): 1. According to the bi-component composite adhesive, through a simple esterification synthesis reaction, high-hydrophobicity dibasic alcohol and long-carbon-chain dibasic acid are introduced to prepare polyester polyol which is good in temperature resistance and hydrolysis resistance; through the addition of the catalyst and the hydrolysis-resistant stabilizing agent, the curing reaction speed of the adhesive is further accelerated, and the hydrolysis resistance of the cured adhesive is further improved. The composite adhesive prepared by the invention is applied to the solar power assembly back panel to endow the solar power assembly back panel with better UV resistance, hydrolysis resistance and aging resistance.

Description

technical field [0001] The invention belongs to the technical field of adhesives. Specifically, the present invention relates to a two-component polyurethane adhesive. More specifically, the present invention relates to a two-component composite polyurethane adhesive that can be used in the manufacture of solar module backplanes and its preparation method . Background technique [0002] With the increasing demand for clean energy, solar power stations have emerged in recent years, and solar modules are the basic power generation devices of solar power stations. Solar modules are mainly composed of tempered glass, EVA film, silicon cells and composite backsheet. The back sheet is located on the back of the solar cell module, which protects the cells and has reliable insulation, sealing, water resistance and aging resistance. The backsheet of solar modules generally has a three-layer structure, such as PVDF / PET / PE, in which PVDF is a fluorine-containing film as the outer pro...

AI Technical Summary

Problems solved by technology

However, the viscosity of the polyester-based two-component polyurethane adhesive is too high, and the compatibility with other additives is poor, so the added additives cannot improve the performance of the adhesive well.

The patent with authorized notification number CN 103044665B discloses a hydrolysis-resistant polyester polyol and its preparation method, using aliphatic dicarboxylic acid or carboxylic anhydride, aromatic dibasic acid or ester, polyol or additives as raw materials, A polyester polyol suitable for flexible packaging adhesives has been prepared by esterification reaction. However, since this method only uses short-chain acid or alcohol structure raw materials, although the disadvantage of high viscosity of traditional adhesives has been improved to a certain extent. , but at the same time, the mechanical properties and thermal stability of the prepared adhesive are reduced, and the hydrolysis resistance is limited, so the polyester polyol prepared by this method is not suitable for the bonding of solar back panels

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