CN-121991389-A - Transparent frosted film

Abstract

The application discloses a transparent frosted film, which is prepared by adopting a precoated transparent PET (polyethylene terephthalate) substrate, wherein PET is polyethylene terephthalate and is prepared by a one-side coating process, the coating process is matched with a coating formula containing a main film forming material, an ultraviolet absorber and other auxiliary agents, the coating surface is a transparent coating to ensure the transparency of a backboard, one-side coating process reduces one layer of coating compared with the traditional process, the film comprises a frosted structure for reducing glare interference under strong light, a photovoltaic module realizes high-efficiency solar energy absorption through the film, and the transparent frosted film meets preset performance indexes including mechanical performance, optical performance, weather resistance and insulating performance. The structure can be stably adapted to the use requirements of various small photovoltaic modules for a long time, and meanwhile, the preparation cost is effectively reduced through the application of one-side coating technology.

Inventors

• JIANG XIN
• HUANG YANLIN
• LI JING
• YE SHENG

Assignees

• 浙江南洋科技有限公司

Dates

Publication Date

20260508

Application Date

20260206

Claims (8)

1. 1. The transparent frosted film is characterized by being prepared by adopting a precoated transparent PET (polyethylene terephthalate) substrate, wherein PET is prepared by a one-side coating process, the coating process is matched with a coating formula containing a main film forming material, an ultraviolet absorber and other auxiliary agents, and the coated side is a transparent coating to ensure the transparency of a backboard; compared with the traditional process, the one-side coating process reduces one-layer coating, the film material comprises a frosted structure for reducing glare interference under strong light, and the photovoltaic module can efficiently absorb solar energy through the film material; The transparent frosted film meets the requirements of preset performance indexes including mechanical performance, optical performance, weather resistance and insulating performance.
2. 2. The transparent abrasive film of claim 1, wherein the host film former comprises a hydroxyl-containing fluorocarbon resin for providing weatherability and adhesion for subsequent cross-linking curing.
3. 3. The method of claim 1, wherein the step of mixing the coating formulation comprises adding the main film former, the ultraviolet absorber diluted with the solvent, and the other auxiliary agent.
4. 4. The film of claim 1, wherein the coating formulation is formulated to meet predetermined temperature, predetermined humidity, predetermined cleanliness requirements and the formulated area is ventilated well away from the fire source and the static power source.
5. 5. The transparent frosted film according to claim 1, wherein the coating process adopts one of micro-concave coating, comma knife coating and slit coating, and the frosted coating liquid is precisely transferred to a single side of the precoated transparent PET substrate through corresponding coating equipment to realize uniform coating.
6. 6. The transparent frosted film according to claim 1, wherein the preparing step comprises the sub-steps of: s1, preparing a frosted base material, mixing a solvent with resin particles, performing nitrogen replacement on a reaction kettle to control the oxygen content in the kettle to be lower than a preset proportion, and performing premixing, high-speed dispersion, deaeration, filtration and concentration treatment; s2, coating the frosted base material on a precoated transparent PET substrate through a coating process, and cooling to obtain a preformed film; s3, performing heat curing treatment on the preformed film to crosslink and shape the coating; s4, performing matte treatment on the cured film surface to obtain the transparent frosted film.
7. 7. The transparent frosted film of claim 1, wherein the predetermined performance index comprises a longitudinal and transverse tensile strength not lower than a predetermined strength value, a longitudinal elongation at break not lower than a predetermined longitudinal elongation value, a transverse elongation at break not lower than a predetermined transverse elongation value, a coating adhesion of 0 level, a back sheet, an EVA peel strength not lower than a predetermined peel strength value, a longitudinal and transverse heat shrinkage not higher than a predetermined shrinkage value, a breakdown voltage not lower than a predetermined voltage value, a water vapor transmission not higher than a predetermined transmission value, and a light transmission not lower than a predetermined light transmission value, wherein EVA is an ethylene-vinyl acetate copolymer.
8. 8. The transparent frosted film according to claim 1, wherein the transparent frosted film is adapted to a small photovoltaic module of a small street lamp power generation, a solar mobile charging device and other scenes, and the small photovoltaic module further comprises a solar field charging panel module and an outdoor distributed power generation module facing a domestic low-end market.

Description

Transparent frosted film Technical Field The invention relates to the technical field of photovoltaic modules. Background In the prior art, the transparent film used for the small photovoltaic module is prepared by a double-sided coating process, the preparation steps are complicated, the production cost is high, the large-scale popularization is not facilitated, meanwhile, a frosted structure is not arranged on part of the transparent film, glare is easy to generate in a strong light environment, the absorption of solar energy by the photovoltaic module is interfered, and the power generation efficiency is affected. In addition, the coating formula of the conventional transparent film is unreasonable in collocation, the preparation process is not standard, and the requirements of unified performance indexes are not clear, so that the performances of the film material such as weather resistance and adhesive force are unstable, the film material cannot be adapted to the outdoor use requirements of the small-sized photovoltaic modules for a long time, and the adaptation range of part of the film material is narrow, so that the application requirements of the small-sized photovoltaic modules of different types are difficult to meet. (1) Patent (CN 210156397U) of Zhejiang Jing Ke energy Co, etc. discloses a portable photovoltaic power supply, and its photovoltaic panel contains transparent rete, first EVA glue film, battery piece layer isotructure that sets gradually, and wherein transparent rete adopts dull polish PET rete. The frosted film can reduce light reflection to a certain extent, is applied to portable photovoltaic products, meets the requirements of miniaturized and portable use fields Jing Xuqiu, and has similarities with the application scene of the small photovoltaic module. However, it may not be deeply optimized for the specific optical properties required for improving the power generation efficiency of the photovoltaic module, such as a balance of high light transmittance and high haze. (2) A photovoltaic synergistic film with a double-sided matte coating is designed by a patent (CN 222647876U) of new material science and technology limited company of Changzhou, and comprises an adhesive layer, a second matte coating, a substrate layer and a first matte coating from bottom to top. The patent solves the problems of poor weather resistance and easy yellowing of the existing photovoltaic synergistic film by optimizing the film structure, and can be applied to the double-glass assembly to improve the output power. The improved thought of the structure and the function of the film layer is similar to the invention, but in the aspect of improving the power generation efficiency of the photovoltaic module by the light scattering effect of the frosted film, deeper researches and innovations may be lacking. (3) Patent (CN 119751950A) of Kandefeier Utility company in Zhangjia Kong's bonded area discloses a frosted texture film and a preparation method thereof, wherein the frosted texture film is formed by a substrate layer and a frosted texture coating, and is formed by heat treatment of a specific frosted coating liquid and photo-curing. The patent focuses on the preparation method and the adaptation to different application scenes by adjusting components, but in the aspect of application of the photovoltaic module, the research on the improvement of the power generation performance of the photovoltaic module is not performed, and the application target of the invention on the photovoltaic module is different. In summary, the prior art does not perform deep optimization for specific optical performance required for improving the power generation efficiency of the photovoltaic module, such as balance of high light transmittance and high haze, lacks deeper research and innovation in terms of improving the power generation efficiency of the photovoltaic module by using the frosted film to scatter light, and does not perform research for improving the power generation performance of the photovoltaic module in terms of application of the photovoltaic module. There is a need to develop a transparent frosted film to solve the problems in the prior art. Disclosure of Invention The invention aims to provide a transparent frosted film which can be stably adapted to the use requirements of various small photovoltaic modules for a long time, and meanwhile, the preparation cost is effectively reduced through the application of a one-side coating process, and the transparent frosted film is simple in structure and convenient to use, so that the problems in the background technology are solved. In order to achieve the above purpose, the present invention provides the following technical solutions: The transparent frosted film is prepared by a precoating transparent PET substrate through a one-side coating process, wherein the coating process is matched with a coating formula containing a main film forming material, a