High-heat-preservation and aging-resistant three-layer agricultural greenhouse film and preparation method thereof

Abstract

The invention provides a high-heat-preservation and aging-resistant three-layer agricultural greenhouse film and a preparation method thereof. The greenhouse film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer comprises EVA(14 / 0.7), talcum powder, an anti-aging agent, the macromolecular crystallization modifier T-1 and the processing coordinator; the middle layer comprises EVA(5 / 0.3), talcum powder, an IR regulator, the macromolecular crystallization modifier T-1 and the processing coordinator; and the inner layer comprises LDPE, LLDPE, EVA(5 / 0.3), talcumpowder, an antifogging drop, the macromolecular crystallization modifier T-1 and the processing coordinator. The preparation method comprises the following steps: compounding the outer layer, the middle layer and the inner layer through a three-layer co-extrusion film blowing machine, carrying out extrusion, carrying out blow molding to form a film, and carrying out traction and rolling so as to obtain a greenhouse film finished product. The greenhouse film finished product can reach a photosynthetic strength of 0.88 mg * CO<2> / m<2> * S, a light transmittance of 92%, a haze of 25% and an infrared transmittance of 20%, can be continuously used for 6 months or more, and has the advantages of good heat preservation performance and fog drop antifogging property and long service life.

Description

technical field [0001] The invention relates to a plastic film, in particular to a three-layer agricultural shed film with high thermal insulation and aging resistance and a preparation method thereof. Background technique [0002] Vegetable greenhouse planting is a commonly used planting method in modern agriculture. It is a frame-covered structure with excellent thermal insulation performance. The emergence of vegetable greenhouses allows people to eat off-season vegetables. Generally, the vegetable greenhouse uses a bamboo structure or a steel structure frame, covered with one or more layers of thermal insulation plastic film, thus forming a greenhouse space. The outer film can well prevent the loss of carbon dioxide produced by the growth of vegetables inside, so that the shed has a good heat preservation effect. [0003] At present, functional shed films widely used in the market include longevity film, non-drip film, long-life non-drip film, etc. For the high-tempera...

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Problems solved by technology

[0003] At present, functional shed films widely used in the market include longevity film, non-drip film, long-life non-drip film, etc. For the high-temperature insulation performance of shed film, it is usually further strengthened by adding an insulating agent, and the insulating agent usually uses inorganic fillers. However, inorganic fillers usually affect the life of the shed film and affect the use effect, so a three-layer agricultural shed film with high thermal insulation and aging resistance is needed