A self-cleaning solar energy high reflectivity nano film and its manufacturing method

Abstract

A self-cleaning solar energy high-reflectivity nano film and its manufacturing method, comprising a base layer, which is stainless steel or plexiglass, with a thickness of 0.3 mm to 1.2 mm, on which is a transition layer, made of copper or chromium, with a thickness of 20 nm to 50 nm, On it is a reflective layer, the reflective layer is silver, its thickness is 80nm ~ 150nm, on it is a protective layer, the protective layer is silicon dioxide, its thickness is 200nm ~ 800nm, on it is a self-cleaning layer, self-cleaning The layer is titanium dioxide, and its thickness is 50nm-250nm. When the reflective film of the present invention is a silver film, the reflectivity to sunlight is 94% to 97%, and when the reflective film is an aluminum film, the reflectivity is 90% to 92%. The present invention not only has high reflectivity, but also has The self-cleaning function is just as bright as new after just flushing with water, and the outdoor service life is long.

Description

technical field [0001] The invention relates to a light-reflecting material, especially a material that can reflect sunlight and gather heat energy, and especially relates to a material and a method for manufacturing a bendable solar-reflecting and heat-gathering material. Background technique [0002] In the prior art, solar energy is an inexhaustible and inexhaustible energy source, and its utilization has become the most economical and green energy recognized by people, and people are competing to carry out research on solar power generation and heating. [0003] However, improving solar energy conversion efficiency has been a bottleneck. Every percentage point of improvement in conversion efficiency requires a huge price and a long research time. [0004] In the trough-type concentrating heat collection system, reflective materials are widely used in solar thermoelectric devices, solar air conditioners, solar boilers, solar cookers and other solar medium and high temper...

AI Technical Summary

Problems solved by technology

Due to the existence of the protective layer, the reflectivity of silver and aluminum reflective materials is greatly reduced. For silver, the best reflectivity in current practical applications only reaches 90%.

In addition, the protective material also brings many other problems, such as glass is easy to break during transportation and use, the price of PMMA is relatively high, the service life is short, and when there is water, the adhesion between silver and PMMA is not good.

PET is cheap and has good stability to ultraviolet light, but its stability becomes poor when the temperature exceeds 110 ℃, etc. Looking for high reflectivity, cheap and durable reflective materials has always been the goal of people's research

[0007] In the prior art, in order to maintain the reflectivity of the reflective material, it must be cleaned regularly. During cleaning, friction and cleaning agents will cause certain damage to the surface of the reflective material, which not only reduces its reflectivity, but also shortens its service life. It is improved from the perspective of improving the wear resistance of the material and selecting a suitable cleaning agent. The cost is high and the effect is poor.

[0008] So far, no ideal reflective material with high reflectivity, thin and easy to bend, high mechanical strength, water resistance and dust resistance has come out.

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