Light-scattering and thermal-insulating thermal radiation regulating and controlling membrane for agricultural facilities and preparation method

Abstract

The invention discloses a light-scattering and thermal-insulating thermal radiation regulating and controlling membrane for agricultural facilities and a preparation method thereof. The regulating and controlling membrane comprises a light scattering layer and a light absorbing radiation layer, wherein a master batch of the light scattering layer comprises the following components in parts by weight: 426 parts of rutile type titanium dioxide, 0.6 part of phthalocyanine blue, 30 parts of YA-II-200 type stearic acid, 26.4 parts of PE (polyethylene) wax, 367 parts of LDPE (low-density polyethylene), and 150 parts of LLDPE (linear low density polyethylene). The thickness of the light-scattering and thermal-insulating thermal radiation regulating and controlling membrane, which is prepared by the invention, is 100 to 140mu m, and a thickness ratio of the light scattering layer to the light absorbing radiation layer is 5 to 2. When the light-scattering and thermal-insulating thermal radiation regulating and controlling membrane prepared by the method provided by the invention is used, under the condition of full-sunlight, the light-scattering and thermal-insulating rate to the sunlight can reach 85%, the sunlight coverage rate can reach 99.5%, and a preference temperature environment is provided for the growth of crops.

Description

[0001] The present invention is a divisional application of application number 201510789895.6, application date November 17, 2015, and title of the invention "a light astigmatism, thermal insulation and thermal radiation control film and its preparation method". technical field [0002] The invention relates to an astigmatism heat-insulating heat-radiation control film for agricultural facilities and a preparation method thereof. The astigmatism heat-insulation heat radiation control film is suitable for agricultural production in dark environments such as edible fungi and white asparagus, and for softening cultivation of vegetables such as garlic yellow, leek yellow, and celery. As well as facility agriculture such as temperature control for animal husbandry, temperature adjustment for early or late dormancy of fruit trees, etc.; it belongs to the field of agricultural technology. Background technique [0003] In the 1950s, countries such as Japan, Europe and the United Stat...

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Problems solved by technology

[0008] Although reflective films and sunshade nets are widely used in the agricultural field, they cannot meet the needs of modern agricultural production due to their technical and structural factors.

One is that the reflective film in agriculture has a large area; the area reflects light, which will form bright and dazzling white pollution.

The second is that the sunshade net has a limited effect on sunshade and heat insulation, and cannot meet the requirements of agricultural reduction.

The third is that the reflective film has a large light loss, low reflectivity, and no thermal radiation emission capability; the sunshade net absorbs sunlight to generate a large amount of heat energy, which increases the temperature of the air around the net, and the far infrared rays generated will emit heat radiation in both directions, indirectly increasing the temperature of the facility

The heat insulation and cooling effects of the two are not significant

[0009] The existing light-temperature-regulating functional films have the following defects: (1) the astigmatism covering effect is poor, and the sunlight covering rate is not high; (2) the heat insulation function is poor, and the effect of heat insulation and cooling on agricultural facilities is not obvious; (3) Single function, shading, heat insulation, cooling and warming cannot be achieved at the same time

[0010] Therefore, there is no ideal light and temperature control film in agricultural production.

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