CN-121991567-A - Super-hydrophobic self-cleaning coating for photovoltaic panel and preparation method thereof

CN121991567ACN 121991567 ACN121991567 ACN 121991567ACN-121991567-A

Abstract

The invention provides a super-hydrophobic self-cleaning coating for a photovoltaic panel and a preparation method thereof, belonging to the field of self-cleaning materials. The super-hydrophobic self-cleaning coating for the photovoltaic panel comprises modified nano silicon dioxide particles, nano titanium dioxide, an antibacterial agent, epoxy resin, a curing agent and hydroxyl-terminated polydimethylsiloxane, wherein the micro-nano coarse structure constructed by the modified nano silicon dioxide and the low surface energy of the hydroxyl-terminated polydimethylsiloxane realize super-hydrophobic performance, so that water and stains are difficult to adhere, the self-cleaning capability is realized, the synergistic effect of titanium dioxide loaded by nitrogen doped silver and nano zinc oxide is realized, the photocatalytic degradation efficiency is greatly improved, the organic pollutants are efficiently decomposed, meanwhile, the bacteria are effectively inhibited, and the biological pollution is reduced. The coating has the performances of superhydrophobicity, self-cleaning, photocatalytic degradation, bacteriostasis and the like, the power generation efficiency of the photovoltaic panel is obviously improved, and the service life is prolonged.

Inventors

TANG JIANJUN
LI BINQI
ZHAO WENBIN
LIU HENGZI
LIU PENG
Sun Linyingyuan
ZHOU JILIANG
CHEN SHIJUN

Assignees

三峡新能源永胜县有限公司

Dates

Publication Date: 20260508
Application Date: 20260115

Claims (10)

1. The super-hydrophobic self-cleaning coating for the photovoltaic panel is characterized by comprising, by weight, 12-25 parts of modified nano silicon dioxide particles, 4-8 parts of nano titanium dioxide, 0.5-2 parts of an antibacterial agent, 20-30 parts of epoxy resin, 5-10 parts of a curing agent, 6-12 parts of hydroxyl-terminated polydimethylsiloxane and 45-60 parts of a solvent.
2. The super-hydrophobic self-cleaning paint for a photovoltaic panel according to claim 1, wherein the modified nano-silica particles are obtained by modifying n-octyl triethoxysilane, 1, 2-bis trimethoxy silyl ethane and a silane coupling agent.
3. The super-hydrophobic self-cleaning paint for a photovoltaic panel according to claim 2, wherein the silane coupling agent is one or more of gamma- (2, 3-glycidoxy) propyl trimethoxysilane, vinyl triethoxysilane, isobutyl triethoxysilane, vinyl trimethoxysilane and vinyl tri (beta-methoxyethoxy) silane.
4. The super-hydrophobic self-cleaning paint for a photovoltaic panel according to claim 2, wherein the volume ratio of the n-octyl triethoxysilane, the 1, 2-bis trimethoxy silyl ethane and the silane coupling agent is 3-7:0.5-1.5:1-2.
5. The super-hydrophobic self-cleaning paint for the photovoltaic panel according to claim 2, wherein the particle size of the silicon dioxide is 20-40nm, and the particle size of the modified SiO 2 particles is 60-100nm.
6. The super-hydrophobic self-cleaning coating for the photovoltaic panel according to claim 1, wherein the antibacterial agent is nano zinc oxide, the particle size is 10-20nm, the epoxy resin is E51 epoxy resin, and the curing agent is polyamide curing agent.
7. The super-hydrophobic self-cleaning paint for a photovoltaic panel according to claim 1, wherein the nano titanium dioxide is titanium dioxide loaded with nitrogen doped silver.
8. The super-hydrophobic self-cleaning paint for a photovoltaic panel according to claim 7, wherein the particle size of the titanium dioxide loaded with nitrogen-doped silver is 10-20nm.
9. The preparation method of the super-hydrophobic self-cleaning coating for the photovoltaic panel, which is disclosed by any one of claims 1-8, is characterized by comprising the steps of adding epoxy resin and hydroxyl-terminated polydimethylsiloxane after ultrasonic dispersion of modified silicon dioxide particles and nano titanium dioxide in a solvent, stirring and mixing uniformly, adding an antibacterial agent, stirring and mixing uniformly, adding a curing agent, and stirring uniformly to obtain the super-hydrophobic self-cleaning coating for the photovoltaic panel.
10. The method for preparing the super-hydrophobic self-cleaning paint for the photovoltaic panel, which is disclosed in claim 9, is characterized in that the solvent is a mixture of ethanol, isopropanol and water, and the volume ratio is 0.8-2:2-3:0.5-1.5.

Description

Super-hydrophobic self-cleaning coating for photovoltaic panel and preparation method thereof Technical Field The invention relates to the field of self-cleaning materials, in particular to a super-hydrophobic self-cleaning coating for a photovoltaic panel and a preparation method thereof. Background Solar energy has evolved in recent years to be the most popular energy source among renewable energy sources, and photovoltaic modules themselves provide a relatively economical and efficient method of generating electricity. However, the photovoltaic panel is exposed to outdoor environment for a long period of time, and various pollutants such as dust, bird droppings, microorganisms and the like are easily accumulated on the surface, so that the light transmittance is reduced. The power generation efficiency of the photovoltaic module can be reduced due to accumulation of attachments on the surface of the battery plate, and the distribution of pollutants on the surface of the photovoltaic plate is often uneven, partial areas are seriously shielded, surrounding areas are normally subjected to light, and dead angles formed by the shielding effect are extremely easy to cause a hot spot effect. Under the state of hot spots for a long time, the performance of semiconductor materials in the photovoltaic cell can be gradually degraded, irreversible damage to the cell piece occurs, the service life of the photovoltaic module is greatly shortened, and the operation and maintenance cost and the safety risk of a power station are increased. In order to ensure the lasting and stable operation of the photovoltaic panel, the application of a functional coating on the surface of the panel becomes an important means. However, the existing coating has the problems of short service life, low adhesive force, low light transmittance, poor self-cleaning capability, large environmental pollution caused by organic diluents and the like, is difficult to bear long-term ultraviolet irradiation, temperature and humidity change and chemical corrosion under the outdoor complex environment, and is easy to cause the phenomena of ageing, peeling and the like of the coating. In addition, most coatings focus on the hydrophobic property, but can take away part of dust through water drop rolling, but lack the capability of decomposing pollutants such as bird droppings, bacteria and the like, so that the pollutants remain for a long time to influence the power generation performance, or the photocatalytic property can degrade the pollutants attached to the photovoltaic panel, but the limited hydrophobic property still causes part of the pollutants to remain, so that microorganisms are bred to influence the power generation efficiency. The patent CN119614027A discloses a photovoltaic self-cleaning dustproof anti-reflective nano coating and a use method thereof, wherein the nano material comprises amorphous silicon dioxide, deionized water, polyethylene glycol and a surfactant, the silicon dioxide is firstly placed into the deionized water to be heated, stirred and mixed to obtain a suspension, then the mixed solution of the polyethylene glycol and the surfactant is added into the suspension, and the suspension is completely mixed and then cooled to obtain a final coating product. The coating is suitable for surfaces of photovoltaic glass, photovoltaic panels and the like, and has the functions of self cleaning, dust prevention and light reflection prevention through the effect of the nano coating, the surface of the coating is effectively protected, and the power generation efficiency is improved. However, the requirements of long-term stable operation of the photovoltaic panel cannot be fully met in terms of coating durability, capability of decomposing complex pollutants, adhesion force with the panel and the like. Patent CN120158220a discloses a self-cleaning photovoltaic super-hydrophobic coating based on nano porous structure and a preparation method thereof, wherein the coating comprises, by mass, 15-25% of nano porous silica particles, 5-10% of low surface energy modifier, 3-8% of photocatalytic nano titanium dioxide, 30-40% of organic silicon resin and the balance of deionized water. The coating is only dependent on the self structure of the nano porous silica to construct a super-hydrophobic surface, the structural stability and the adhesive force with a photovoltaic panel matrix are required to be improved under a complex outdoor environment, the coating is easy to peel off after long-term use, the photocatalysis efficiency of the photocatalysis nano titanium dioxide is limited, an effective inhibition means for microbial pollution is lacking, and various pollution challenges facing the photovoltaic panel are difficult to solve. The patent CN118206891A discloses a nano photocatalysis self-cleaning coating for a photovoltaic panel and a preparation method thereof, wherein the nano photocatalysis self-cleaning coating comprises the followi