A kind of wide width and high weather resistance light conversion shed film and preparation method thereof

Abstract

The invention discloses a wide-width high-weather resistance light-converting shed film and a preparation method thereof, which belong to the technical field of agricultural films. The shed film has a five-layer or seven-layer structure formed by extrusion blow molding, and the core layer contains light-converting The inner layer contains nylon, which enhances the outdoor weather resistance of the shed film and prolongs the light conversion time. By rationally deploying the raw materials of each layer structure and the order of the layers, the interlayer ratio is adjusted to solve the problem of high nylon brittleness and the surface layer of the shed film. The problem of easy cracking; through the multi-layer co-extrusion process, the content of nylon can be reduced, the content of high-pressure low-density polyethylene can be increased, and the greenhouse film with a width of 16 meters can be produced.

Description

technical field [0001] The invention relates to a wide-width high-weather-resistance light-converting shed film and a preparation method thereof, belonging to the technical field of agricultural films. Background technique [0002] With the rapid development of modern agricultural science and technology, there are more and more new functions of agricultural shed films, such as the light conversion function. Adding a light conversion agent to the shed film can convert the ultraviolet rays in the sun into chlorophyll for crops to directly absorb them during photosynthesis. The red light and blue light used can promote the growth of crops, and in practical applications, a very obvious effect of increasing production and income has been obtained. However, polyethylene has good air permeability, and the light conversion agent is a rare earth organic complex. The light conversion agent will decompose under the action of outdoor water vapor and oxygen. After 3 months of actual use,...

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Problems solved by technology

[0003] Although some patents disclose the technology of using nylon material as the surface layer of the shed film to protect the internal light transfer agent, but due to the unreasonable coordination of the materials of each layer, the surface layer of the shed film made is relatively brittle. Once a small crack occurs on the surface of the membrane due to scratching, it will expand along the crack, resulting in failure of a large area of ​​the shed film

[0004] Secondly, the price of nylon materials is about three times that of polyethylene raw materials, limited by the production process and production equipment, the proportion of nylon in the three-layer co-extruded shed film containing nylon is more than 60%, and the five-layer co-extrusion film containing nylon The proportion of nylon in squeezed shed film is also about 40%, resulting in more than double the price of shed film than normal shed film, which is very unfavorable for promotion

[0005] Again, nylon has poor foam stabilizing properties, and high-pressure low-density polyethylene is the main component that provides foam stabilizing properties in the extrusion blown film production process, and the proportion of nylon and adhesive resin in the currently disclosed nylon-containing shed film is very high , so that the proportion of high-pressure low-density polyethylene is very small, which leads to the fact that the width of the prepared greenhouse film is generally not higher than 11 meters, and now the span of the greenhouse is getting larger and larger, basically more than 12 meters. The nylon-containing shed film is difficult to meet the application requirements of shanty towns, and the adhesive resin contained in the surface layer will cause the film to stick

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