Mold-proof and antibacterial photovoltaic back plate and preparation method thereof

Abstract

The invention discloses a mold-proof and antibacterial photovoltaic back plate which sequentially comprises a weather-proofing fluorine membrane, an adhesive layer, PET (polyethylene terephthalate), an adhesive layer and a mold-proof and antibacterial membrane, wherein the mold-proof and antibacterial membrane comprises the following ingredients in parts by mass: 60-95 parts of polyolefin, 0.1-7 parts of a mold-proof and antimicrobial agent, 2-40 parts of inorganic fillers, 0.1-10 parts of an antioxidant, and 0.1-5 parts of an uvioresistant agent; and the mold-proof and antimicrobial agent istitanium dioxide and has a particle size of less than 100nm. Growth of mold and microorganisms in the back plate can be effectively inhibited, or killed by contact; the problems of performance degradation, an abnormal appearance and the like of the back plate due to reproduction of the mold and the microorganisms are avoided; and the long term performance stability of the back plate is ensured.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic backplanes, and in particular relates to a mildew-proof and antibacterial photovoltaic backplane and a preparation method thereof. Background technique [0002] The solar backsheet is located on the back of the solar module and is in contact with the external environment in a large area to protect and support the cells. Therefore, it is required to have good bonding performance with the cells and EVA, and to have excellent long-term aging resistance (moist heat, Dry heat, ultraviolet), resistance to electrical insulation, water vapor barrier and other properties. [0003] At present, there are many types of photovoltaic backsheets on the market, usually with a three-layer hamburger structure, the outermost layer is PVF / PVDF film with excellent weather resistance, and the middle layer is polyester (PET) with excellent water vapor barrier performance and insulation performance. The innermost l...

AI Technical Summary

Problems solved by technology

However, during the storage and use of this kind of polyolefin backsheet, it was found that the innermost layer, that is, the surface of the polyolefin film, would have mildew spots, which greatly affected the appearance of the backsheet. For laminated components, the peeling force between the backplane and EVA after mildew spots has attenuated by 20% or more, which seriously affects the normal use of the components. In addition, the use of moldy backplanes or outdoor use Mildew on the backplane will also cause the following adverse effects:

[0005] 1. Mold and microorganisms in the air fall on the surface of the polyolefin film of the backboard, secrete some enzymes that can decompose small molecular substances in the polyolefin film, continue to grow with the additives in the polyolefin film as nutrients, and even form visible to the naked eye. Mildew stains not only seriously affect the appearance of the film, but also the existence of these molds, microorganisms and their metabolites changes the surface structure of the backsheet, resulting in a decrease in the peeling force after it is laminated with EVA, which affects the long-term durability of the module Performance;

[0006] 2. The enzymes and other substances secreted by these molds and microorganisms during the reproduction process are mostly conductive proteins, polysaccharides and other substances, which change the conductivity of the matrix material and reduce the insulation performance of the backplane. The secretions and their secondary metabolites may also be corrosive to a certain extent, which will continuously corrode the backplane, causing the water vapor barrier performance of the backplane to drop sharply. failure rate;

[0007] 3. Mold and microorganisms use various additives in the film as food sources, resulting in the continuous degradation of plasticizers and other additives, making the polyolefin film brittle and shrinking, further leading to the loss of tensile strength and integrity, and finally greatly shortening service life of the backplane;

[0008] 4. Staff who have been in contact with this kind of mildewed backboard for a long time are very likely to be infected by germs and suffer from diseases, endangering human health

[0009] To sum up, it is particularly important to improve the antibacterial and anti-mildew effect of the back sheet and prevent the back sheet from mildew during storage and use. However, there are no such anti-mold and anti-bacterial back sheet products or related improvement measures and reports.

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