Composite rubber-plastic all-season heat preservation and insulation quilt for greenhouses

Abstract

The invention discloses a composite rubber-plastic all-season heat preservation and insulation quilt for greenhouses. A rubber-plastic coiled material is used as a heat preservation core material, theupper surface of the rubber-plastic greenhouse quilt is provided with a multilayer co-extruded anti-aging polyethylene film with a black or white surface facing outwards, and the lower surface of therubber-plastic greenhouse quilt is provided with a multilayer co-extruded anti-aging polyethylene film with a white surface facing outwards. Due to adoption of the white polyethylene film on the lower surface, the white polyethylene film with great reflection performance is capable of reflecting far infrared radiation in the greenhouse back into the greenhouse to improve the integral heat preservation performance of the greenhouse quilt. In addition, the composite rubber-plastic all-season heat preservation and insulation quilt can meet market demands of different geographic regions, different plant species, different facility types and different planting seasons.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a thermal insulation quilt which uses rubber and plastic as a thermal insulation base material and can be widely used in different types of agricultural greenhouse facilities for four seasons. Background technique [0002] Usually, the covering time of the thermal insulation quilt for the greenhouse is: around 16:00 in winter to around 8:00 the next day, for antifreeze and thermal insulation; in summer 11:00 to 15:00, for sun protection and heat insulation. [0003] At present, the types of shed quilts suitable for solar greenhouses in my country mainly include: [0004] 1. Black heart cotton shed quilt: The shed quilt uses black heart cotton as the insulation core material, uses waterproof Oxford woven fabric or nylon non-woven fabric as the surface material, and uses a sewing machine to sew the black heart cotton and waterproof fabric together. ...

AI Technical Summary

Problems solved by technology

[0007] However, due to the wide geographical distribution of solar greenhouses, the climatic conditions such as temperature, ultraviolet intensity, wind force, snowfall, and rainfall vary widely in different regions.

The above-mentioned third type of shed quilt shows some serious physical defects and limitations in applicable areas, and cannot meet the market demands of different geographical regions, different planting varieties, different facility types, and different planting seasons

First, an aluminum foil layer is sprayed on the inner protective layer to form an aluminum foil-clad polyethylene film. Due to the high thermal conductivity of the aluminum material used in the aluminum foil, the thermal insulation performance of the aluminum foil-clad polyethylene itself is low, and the aluminum foil-clad polyethylene film is The aluminum foil and the polyethylene film of the film are hot-pressed and bonded by polymer materials. This polymer material has low anti-aging ability and is easy to age and delaminate under sunlight, resulting in a short service life of the aluminum foil-coated polyethylene film. After the shed is rolled up during the day, a part of the inner protective layer of the aluminum-foiled polyethylene film on the top is exposed to the sun all year round. This part of the aluminum-foiled polyethylene film is prone to aging, cracking or even delamination and cracking, which greatly shortens the The service life of the overall shed quilt; second, the design of the outer protective layer of black polyethylene film limits the practical application range of farmers. The greenhouse is covered with sunshade in summer, but the upper surface of the shed is made of black polyethylene film, and the black heat absorption is extremely strong, and the surface of the covered shed can reach a high temperature of 68°C when the sun is strong in summer, which affects the use of sunshade and heat insulation. Thirdly, the tear resistance of rubber-plastic coils and polyethylene films is low, and the quilts made of them are easily torn by strong winds in areas with strong winds such as the northwest of Beijing, Ningxia, and Xinjiang. Damage; Fourth, the bonding surface between the outer black anti-aging polyethylene film and the inner rubber-plastic core material is easily torn off, resulting in damage to the shed

Because the shed is bonded with polyethylene film and rubber and plastic by hot casting process, the expansion coefficients of the two materials are quite different, and hot casting is a "dead bonding" process, resulting in significant changes in summer and winter temperatures. , under the action of different expansion coefficients of the two materials, the surface of the adhesive layer is torn off, resulting in partial damage to the shed; fifth, each piece of shed is glued with polyethylene tape to form the overall shed of the greenhouse, and the polythene After the vinyl tape is damaged by condensation, rainwater, dust, etc., its adhesive surface is easy to be glued, forming cracks between the shed quilt blocks, which greatly reduces the thermal insulation performance

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