Hydrophobic heat insulation and cooling film and preparation method thereof

Abstract

The invention provides a hydrophobic heat insulation and cooling film and a preparation method thereof. The hydrophobic heat insulation and cooling film is a polymer porous film, the porosity is 30% -90%, the interior of the hydrophobic heat insulation and cooling film is of a spongy structure, the pore diameters of pores are distributed in a bimodal mode, and the width distribution of the poresis 0.2 micrometer - 0.6 micrometer and 1 micrometers - 5 micrometers respectively. The preparation method of the hydrophobic heat insulation and cooling film comprises the following steps of dissolving a polymer into an organic good solvent, adding a non-solvent to prepare a precursor solution, and spraying the precursor solution onto a substrate to obtain the hydrophobic heat insulation and cooling film. The hydrophobic heat insulation and cooling film is a flexible film material with good hydrophobicity, good heat insulation effect and good cooling effect, shows very excellent flexible performance, can be bent and curled at will, can be suitable for the surfaces of base bodies with different shapes, can achieve effective cooling and refrigeration inside the base bodies, and is good in application prospect and high in practicability; the preparation method of the hydrophobic heat insulation and cooling film has the advantages of simplicity, feasibility, low production cost, high filmforming efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the technical field of heat insulation materials, and in particular relates to a hydrophobic heat insulation and cooling film and a preparation method thereof. Background technique [0002] Under the sun exposure, in order to achieve the purpose of heat insulation and cooling without energy consumption, the surface of the substrate (buildings, tents, parking sheds, cars or other equipment) can be covered with heat insulation and cooling film or directly placed on the substrate. However, almost all similar products currently on the market can only partially block the entry of sunlight energy, but cannot efficiently dissipate internal heat, such as aluminum foil. Existing heat insulation film products often use aluminum foil to reflect sunlight. Although aluminum foil can reflect infrared heat, it cannot radiate infrared heat. The heat enters the interior; the bonding strength between the aluminum foil and the substrate is poor,...

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Problems solved by technology

However, almost all similar products on the market can only partially block the entry of sunlight energy, but cannot achieve efficient internal heat dissipation, such as aluminum foil

Existing heat insulation film products often use aluminum foil to reflect sunlight. Although aluminum foil can reflect infrared heat, it cannot radiate infrared heat. The heat enters the interior; the bonding strength between the aluminum foil and the substrate is poor, and the corrosion resistance and weather resistance are poor. The existence of the above defects limits the service life and heat insulation effect of existing heat insulation film products

However, there have been no reports on the large-scale application of polymer porous membranes in the field of heat insulation and cooling.

In addition, the existing polymer porous membrane and its preparation method still have the following problems: the pore size of the existing polymer porous membrane is usually smaller than the submicron level. Although this kind of porous membrane has a strong infrared radiation function due to its composition, it cannot Efficiently prevent the incidence of sunlight, and the contribution of this part of energy to the temperature rise of the substrate is not negligible, so it is difficult to achieve the function of heat insulation and cooling; the existing methods of preparing polymer porous membranes are mainly scrape coating and spraying methods, of which scrape The film area obtained by the coating method is limited and has high requirements on the flatness of the substrate. It is difficult to prepare a film material with a large area and high flatness. Therefore, the scraping method is not suitable for large-area and fast preparation of films with specific holes; When the polymer porous membrane is prepared by the method, the pore morphology of the film is easily affected by the preparation parameters, such as the concentration of the precursor solution, the spraying rate, the spraying height and other parameters are the key factors affecting the membrane pore structure, which makes the existing spraying method It is difficult to prepare a polymer porous membrane that can efficiently reflect full-band sunlight (330nm-2.5μm)

In fact, the existing spraying method for preparing polymer porous membranes still has problems such as low efficiency, high energy consumption, and difficult operation, which also greatly limits the wide application of spraying methods in preparing polymer porous membranes.

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