Solar battery backplane, and preparation method of film polyester used for backplane

Abstract

A preparation method of film polyester used for a backplane comprises the following steps: uniformly dispersing a flame retardant agent and a dispersant in glycol to prepare a flame retardant suspension, mixing fluorine-containing diacid, diol, a catalyst and the flame retardant suspension, carrying out an esterification reaction, adding a stabilizer after the esterification reaction ends, and carrying out a polycondensation reaction. The invention also discloses a method for producing the solar battery backplane by using the film polyester, and the solar battery backplane formed through coextruding slices produced from the film polyester. The film polyester has the advantages of excellent mechanical performances, excellent electrical insulation performance, excellent dimension stability, and excellent flame, weather and moisture resistance, can be widely applied to the fields of building, electronic appliances and solar photovoltaics, and is especially suitable for high-grade solar battery back materials.

Description

technical field [0001] The invention relates to a solar cell accessory and its raw materials and a preparation method of the raw material, in particular to a solar cell backboard and a method for preparing a polyester film used for the backboard. Background technique [0002] A solar cell is a semiconductor component that converts sunlight into electricity. Solar cells are usually assembled from various semiconductor element systems, such as photovoltaic glass, EVA, solar cells, and backplanes. The solar cell back sheet is a multi-layer composite film located on the back of the solar cell panel, which protects and supports the solar cell, and has reliable insulation, water resistance, and aging resistance. Solar cell back sheet is also called solar cell back sheet film, photovoltaic back sheet, photovoltaic back sheet film, etc. [0003] Existing solar battery back sheets generally have a three-layer structure, mainly TPT and TPE with a three-layer structure, wherein T rep...

AI Technical Summary

Problems solved by technology

However, due to the problems of water repellency and difficulty in bonding between ordinary polyester films and polyvinyl fluoride films or polyvinylidene fluoride films, and due to the low oxygen index (LOI) of ordinary polyester films, they are not suitable for heat and humidity resistance and weather resistance. There are obvious deficiencies in performance and flame retardancy. Once affected by external conditions such as sunlight, temperature changes, and wind and rain, a series of problems such as cracking, pulverization, and strength decline are prone to occur. It is difficult to meet the requirements of solar cells

[0004] Chinese patent application 201310594858.0 discloses a polyester film for solar battery backplane film and its preparation method. The polyester film includes surface layer 1, core layer and surface layer 2. The core layer contains polyester chips and masterbatch Polyester chips, containing modified high-humidity and heat-resistant flame-retardant polyester materials; the polyester selected for the polyester film is obtained by copolymerization of purified terephthalic acid and ethylene glycol with reactive phosphorus-based flame retardants, and the product has Certain flame retardancy, but poor weather resistance

[0005] Chinese patent application 201220553468.X discloses a full polyester solar cell back film, which includes a polyester substrate, and the upper side and the lower side of the polyester substrate are covered with an upper high weather-resistant polyester layer and a lower high weather-resistant polyester layer respectively. There is a polyester double-stretched film layer between the polyester backing material and the polyester double-stretched film layer, and between the polyester base material and the lower high-weather-resistant polyester layer. Junction layer; the polyester solar cell back film made by the invention has poor flame retardancy and heat and humidity resistance

[0006] Chinese patent application 201310731940.3 discloses a raw material formula for biaxially stretched solar backplane polyester film and its production method. The formula is composed of special masterbatch and polyethylene terephthalate. The solar backplane The membrane has the characteristics of low water permeability and insulating properties, but it is not flame retardant and has poor resistance to heat and humidity

[0007] Chinese patent application 201010177281.X discloses a method for manufacturing a polyester film for solar battery backplane films. The polyester chip used in the film is made of terephthalic acid, ethylene glycol and phosphorus compounds, and then esterified and polycondensed. Obtained, by mixing with the masterbatch polyester chips at a mass ratio of 100:5-30, and drawing the film to obtain a polyester film for solar battery backplane film, which has low heat and humidity resistance and flame retardancy

[0008] Chinese patent application 200910053911.X discloses a solar cell backsheet with a modified polyvinylidene fluoride alloy layer as a weather-resistant protective layer. The film includes a first weather-resistant layer, a first adhesive layer, and a structurally reinforced Zeng, the second adhesive layer and the second weather-resistant layer, wherein the first weather-resistant layer and the second weather-resistant layer are polyvinylidene fluoride alloy layers modified by inorganic materials, and the structural reinforcement layer is polyethylene terephthalate Alcohol ester layer, the first adhesive layer and the second adhesive layer can be one of polyurethane adhesive layer, acrylate adhesive layer or epoxy adhesive layer. Although the solar cell backsheet has certain weather resistance, it is flame retardant The performance is poor, and the heat and humidity resistance is difficult to meet the use requirements

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