A kind of sealant for fast curing solar photovoltaic module and preparation method thereof

Abstract

The invention discloses a fast cured sealant for a solar photovoltaic module. The sealant is prepared from the following raw materials in parts by weight: 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane, 60-80 parts of nano activated calcium carbonate, 5-10 parts of fumed silica, 1-5 parts of anti-yellowing additive, 1-5 parts of coupling agent, 10-20 parts of cross-linking agent, 0.1-2 parts of catalyst A, 0.001-0.01 part of catalyst B and 1-10 parts of silicon oil plasticizer, wherein the catalyst A is an organic tin chelate, and the catalyst B is bisdioctylstannane. Furthermore, the invention discloses a preparation method of the sealant for the solar photovoltaic module. The sealant can fast cure, so as to better meet a demand of solar photovoltaic module industry on continuous line production; the sealant is excellent in anti-yellowing performance, and has good ultraviolet radiation aging resistance and high-low temperature weathering aging resistance; and the sealant is wide in adhesion on substrates and favorable for improving the sealing component of the photovoltaic module, thus better meeting the practical application demand of the solar photovoltaic module industry.

Description

technical field [0001] The invention relates to the technical field of sealant materials, in particular to a one-component silicone sealant for solar photovoltaic modules and a preparation method thereof. Background technique [0002] Energy is the basic condition for the survival and development of human beings. The use of fossil energy by human beings has created unprecedented economic prosperity, but at the same time, it has also brought about the consequences of energy shortages and environmental degradation. Energy crises and environmental pollution have become inevitable problems for human society. One of the problems that need to be solved urgently for sustainable development. At present, with the increasingly tense global energy situation, solar photovoltaic power generation, as a renewable clean energy alternative, has developed rapidly in recent years and has been widely promoted and applied. [0003] The solar photovoltaic cell, an important component of solar ph...

AI Technical Summary

Problems solved by technology

[0007] One-component room temperature vulcanizing silicone sealants need to rely on moisture for cross-linking and curing. It is difficult for moisture to diffuse into the adhesive layer, and the deep curing is slow. The thickness of the curing is usually only 2-3mm, and it is difficult to achieve continuous flow operation; and Generally speaking, it takes seven or eight hours for the assembled solar panels to be transported, and it takes several days for the sealant to fully cure, which has a serious negative impact on the production efficiency of solar photovoltaic manufacturers.

[0008] (2) Yellowing resistance needs to be improved

[0009] Most products in the prior art use organic titanium complexes as catalysts. Since the organic titanium itself is light yellow or light red, the catalyst does not participate in the chemical reaction during the curing process of the sealant. After curing, there will be a small amount of catalyst leakage, which is easy to Causes EVA in photovoltaic modules to turn yellow

In addition, some auxiliary materials (such as pigments, fillers and additives) have poor aging resistance and residual impurities will also affect the yellowing resistance, and also limit the application of many raw materials with excellent performance

[0010] (3) Poor flame retardancy

[0011] Silicone sealants for solar photovoltaic modules in the prior art have no flame retardant performance, which has a great impact on the service life and safety of solar photovoltaic modules

[0012] (4) Poor adaptability and poor adhesion to the substrate

However, the existing technology products have poor adaptability and poor adhesion to the substrates commonly used in solar photovoltaic modules, and cannot well meet the actual application requirements of the solar photovoltaic module industry.

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