Light reflective sunshading and thermal insulating composite film

Abstract

The reflective sunshading and thermal insulating composite film includes transparent film layer and aluminium layers coated to the transparent layer and features that the aluminum layers include one upper aluminium layer near the transparent layer and lower aluminium layer separated from the upper aluminium layer by a mocroporous foamed layer and there is one protecting layer on the other side of the lower aluminium layer. The composite film of the present invention is thin, soft, light tight and water tight and may be wound. It has an infrared reflecting rate of 61-75% and 5000-10000 nm wavelength earth heat reflecting rate of 37-52% and its use can saving power consumption of green house by 45-70%.

Description

Technical field: [0001] This invention relates to laminated products, in particular to composite films having a multilayer structure. technical background: [0002] The wide application of plastic film in agricultural production is an important measure for agricultural modernization and high and stable production. For example, the use of plastic greenhouses to produce vegetables has been well known and recognized by the public for its role in improving and increasing residents' non-staple food supply. By the end of the 1980s, the coverage area of ​​my country's shed floor molds had been among the highest in the world. Since the mid-to-late 1970s, my country has carried out a lot of research work on agricultural plastic films, and developed a variety of polyethylene ( PE) and polyvinyl chloride (PVC) as the base material, adding different additives to thermal insulation film, anti-aging sunshade film, non-drip film and other products. "Plastic" 1985 No. 3 issue "summary of d...

AI Technical Summary

Problems solved by technology

However, the aluminum layer of this metal reflective film is exposed to ambient gas for a long time. Under high humidity and temperature conditions, it is easily corroded by hydrogen sulfide, sulfur dioxide, and other corrosive gases in the environment, which reduces the reflection and cooling performance, and finally causes aluminum The layer falls off in a large area and loses the purpose of shading

In addition, aluminum is an excellent heat conductor and does not have the function of heat preservation.

At night or in cold winter, when the indoor temperature of the shed is higher than the outdoor temperature, it is easy to cause heat energy to escape and increase energy consumption

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