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Light reflective multifunctional composite film for greenhouse and process for preparing same

A multi-functional, light-reflecting technology, applied in botany equipment and methods, greenhouse cultivation, chemical instruments and methods, etc., can solve the problems of absorbing ultraviolet rays, blocking far-infrared rays, and not reflecting visible light at the same time, so as to reduce solar radiation energy, Good thermal insulation effect, far infrared transmittance reduction effect

Inactive Publication Date: 2006-09-27
SHANGHAI DAZHI SANHUA FILM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Various functional films for agriculture that have been disclosed in this field still have the following deficiencies: they cannot reflect visible light, absorb ultraviolet rays, and block far-infrared rays at the same time. , heat preservation, cooling function

Method used

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  • Light reflective multifunctional composite film for greenhouse and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Metallocene linear polyethylene (mLLDPE), flake aluminum powder (thickness of aluminum powder is less than 1 μm, diameter greater than 10 μm), ultraviolet absorber, ultraviolet absorber is UV-531 (2-hydroxy-4-n-octyloxydi Benzophenone) or UV absorber 327 (2-(2'-hydroxyl-3', 5'-di-tert-butylphenyl)-5-chlorobenzotriazole, respectively 40%, 35% by weight , 25% of the proportion weighed into the high-speed mixer, fully stirred for 15 minutes, unloaded the material, and added to the co-rotating twin-screw extruder. Mixed and plasticized at a temperature of 180-200 ° C, extruded through the mold Noodle hot granulation device, cut into oblate pellets. Air sent to the cooling tank, measured after cooling, put into kraft paper bags, as a light reflection ultraviolet absorption masterbatch (silver) for standby.

[0044] EVA (ethylene-vinyl acetate copolymer with a vinyl acetate content of 14%), far-infrared ray blocking agent (ultrafine calcium carbonate with a particle size belo...

Embodiment 2

[0048] Metallocene linear polyethylene (mLLDPE), rutile titanium dioxide, ultraviolet absorber, ultraviolet absorber is UV-531 (2-hydroxyl-4-n-octyloxybenzophenone) or UV absorber 327 (2- (2'-Hydroxy-3', 5'-di-tert-butylphenyl)-5-chlorobenzotriazole, weighed into the high-speed mixer according to the proportion of 40%, 35%, and 25% by weight respectively , fully stirred for 15 minutes, unloaded the material, and put it into a co-rotating twin-screw extruder. Mixed and plasticized at a temperature of 180-200 ° C, after extrusion, it was cut into oblate pellets by a hot pelletizing device on the die surface The air is sent to the cooling tank, measured after cooling, packed into a kraft paper bag, and used as a light-reflecting ultraviolet-absorbing masterbatch (white) for standby.

[0049] EVA (ethylene-vinyl acetate copolymer with a vinyl acetate content of 14%), inorganic far-infrared blocking agent (superfine calcium carbonate with particle diameter below 10um, SiO 2 conten...

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Abstract

The present invention is reflecting multifunctional three-layer composite film for greenhouse and its preparation process. The composite film has a first or outer layer of polyethylene added with light reflecting and ultraviolet ray absorbing master batch, a second or middle layer of ethylene-vinyl acetate copolymer or the mixture of ethylene-vinyl acetate copolymer and polyethylene added with light reflecting and ultraviolet ray absorbing master batch, and a third or inner layer of polyethylene added with far infrared blocking master batch and black master batch. The first layer is silver or white and the third layer is black. The composite film has the functions of reflecting visible light, absorbing ultraviolet ray, blocking far infrared, killing pests, killing weeds, lower temperature, etc. and possesses excellent mechanical performance and ageing resistance.

Description

technical field [0001] The invention relates to an agricultural covering material and a preparation method thereof. More precisely, the invention relates to a light-reflecting multifunctional three-layer composite film for greenhouses and a preparation method thereof. Background technique [0002] Greenhouse films mainly refer to greenhouse covering films (greenhouse films) and ground covering films (mulch films), which are indispensable means of production for agricultural production today. Shed film and mulch film are used for the cultivation and early seedling raising of various crops and economic crops, and can play the role of adjusting light, weeding, water saving and controlling soil salinity. [0003] Functional greenhouse films have special functions that ordinary greenhouse films and mulch films do not have, such as: anti-aging, anti-fogging, heat preservation, cooling, dimming, weeding, insect repellent and other functions. Functional greenhouse films use polyet...

Claims

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Application Information

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IPC IPC(8): B32B27/00B32B27/18B32B27/32A01G13/02A01G9/14
CPCY02A40/25
Inventor 徐玲柴建敏温耀贤
Owner SHANGHAI DAZHI SANHUA FILM
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