High smelting point, heat resistant and transparent polyethylene membrane

Abstract

The invention relates to the technical field of polyethylene membranes, and particularly relates to a high smelting point, heat resistant and transparent polyethylene membrane. The high smelting point, heat resistant and transparent polyethylene membrane comprises the components of main resin, auxiliary resin, ionomer resin and an antioxidant. According to the high smelting point, heat resistant and transparent polyethylene membrane, an ionomer is utilized for crosslinking, and metal ions in the ionomer and a chain section of a polymer act on each other, the chain section of the polymer is limited to move, and a physical crosslinking point is formed, and the creep resistance of the polymer is improved; moreover, the polyethylene material is promoted to crystal through the ionomer, so thatthe crystallizing degree is improved; the heat resistance of the material is improved; a high heat resisting formula is adopted; the ionomer is used to crosslink, so that that smelting point and the softening temperature of the polyethylene material are increased; compared with other type of polyethylene membranes, the polyethylene glue membrane is simple in formula, outstanding in heat resistance, high in adhering intensity relative to EVA, and particularly high in matching performance with white EVA.

Description

technical field [0001] The invention relates to a polyethylene film, in particular to a heat-resistant transparent polyethylene film with a high melting point. Background technique [0002] The solar cell module is composed of 5-layer structure, photovoltaic glass, high-transparency EVA, battery sheet, high-ultraviolet high-blocking EVA, and photovoltaic backplane; the photovoltaic backplane is used as the packaging material for the backplane of the module, which mainly plays the role of insulation, water vapor barrier, and increased reflection. . [0003] Conventional solar backsheets are composed of multiple layers of materials. Taking the most common composite KPE backsheet on the market as an example, its structure is three layers, the outermost layer (the air contact surface of the backsheet) is PVDF, the middle layer is PET, and The layer material (EVA adhesive layer) is a modified polyolefin film. Since the inner layer material of the backsheet is in direct contact ...

AI Technical Summary

Problems solved by technology

Due to the synergy of white EVA on components and the improvement of cell efficiency, the use temperature of the backsheet has increased. The heat resistance of traditional polyolefin materials is insufficient, and it is difficult to meet the requirements of continuous use of materials at high temperatures (80~95°C).

Polyethylene material has good thermal stability, but its melting point is low, melting occurs above 120°C

In order to improve the heat resistance of polyethylene materials, it is usually necessary to add some high-melting point PP for modification. However, PP materials have poor thermal stability and require high formulation design. In order to improve the heat resistance of PP, it is often necessary to add a large amount of Antioxidants, in the lamination process, antioxidants react with peroxide free radicals in EVA, resulting in low crosslinking degree of EVA, insufficient bonding strength, and delamination defects are prone to occur during high temperature lamination and outdoor use

[0005] Traditional polyolefin crosslinking technologies mainly include coupling agent crosslinking, peroxide crosslinking and other methods. Whether peroxide crosslinking or silane coupling agent crosslinking is used, the crystallinity of polyolefin materials will be reduced and the melting point of the material will be reduced. , leading to a reduction in the use temperature of the material

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