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Passive refrigeration crystal, passive refrigeration coating as well as preparation method and application thereof

A passive refrigeration and crystal technology, applied in the direction of coating, crystal growth, chemical instruments and methods, etc., can solve the problems of non-corrosion or aging of materials, high manufacturing cost, difficult manufacturing and application, etc., to achieve low cost, reduce surface The effect of temperature and performance stability

Active Publication Date: 2019-06-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cooling effect is efficient, it is difficult to achieve large-area manufacturing and application, the manufacturing cost is usually expensive and the material often shows no corrosion resistance or aging

Method used

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  • Passive refrigeration crystal, passive refrigeration coating as well as preparation method and application thereof
  • Passive refrigeration crystal, passive refrigeration coating as well as preparation method and application thereof
  • Passive refrigeration crystal, passive refrigeration coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of Passively Cooled Crystals

[0058] According to the synthesis of 0.02 / 11mol target product Ca y Mg 11-y (HPO 3 ) 8 (OH) 6-x f x (x=3, y=0.5) Calculate the corresponding required mass of each reactant.

[0059] (1) Accurately weigh 4.094g of magnesium acetate tetrahydrate and 0.160g of calcium acetate monohydrate, mix the two into a beaker, dissolve with 20-30g of water and stir until it becomes a transparent colorless liquid.

[0060] (2) Take by weighing 1.64g phosphorous acid solid and 0.229g sodium fluoride solid powder, phosphorous acid and sodium fluoride are dissolved in deionized water respectively, obtain the phosphorous acid aqueous solution that concentration is 0.082g / ml and concentration is 0.0114g / ml ml of sodium fluoride solution.

[0061] (3) Mix all the solutions prepared in steps (1) and (2) to obtain a mixed solution, add a magnetic stirrer, adjust the rotating speed to 300r / min, place the mixed solution on a magnetic stirrer and ...

Embodiment 2

[0079] According to the synthesis of 0.02 / 11mol target product Ca y Mg 11-y (HPO 3 ) 8 (OH) 6-x f x (x=2, y=0.5), the required mass of each reactant can be calculated according to the stoichiometric ratio. The synthesis route of the target product and the preparation method of the passive refrigeration coating are the same as those in Example 1, and will not be repeated here.

[0080] The passive refrigeration crystal prepared in Example 2 has a reflectivity of 0.96 in the ultraviolet-visible-near-infrared band (0.2-2.5um), and an emissivity of 0.91 at the transparent window of the atmosphere (8-13um), and exhibits excellent performance in the infrared long-wave range. A certain emission selectivity.

[0081] The refrigeration test results of the passive refrigeration coating prepared in this example are similar to those in Example 1, and will not be repeated here.

Embodiment 3

[0083] According to the synthesis of 0.02 / 11mol target product Ca y Mg 11-y (HPO 3 ) 8 (OH) 6-x f x (x=3, y=1), the required mass of each reactant can be calculated according to the stoichiometric ratio. The synthesis route of the target product and the preparation method of the passive refrigeration coating are the same as those in Example 1, and will not be repeated here.

[0084] The passive refrigeration crystal prepared in Example 3 has a reflectivity of 0.97 in the ultraviolet-visible-near-infrared band (0.2-2.5um), and an emissivity of 0.90 at the transparent window of the atmosphere (8-13um), and exhibits excellent performance in the infrared long-wave range. A certain emission selectivity.

[0085] The refrigeration test results of the passive refrigeration coating prepared in this example are similar to those in Example 1, and will not be repeated here.

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Abstract

The invention discloses a passive refrigeration crystal, a passive refrigeration coating as well as a preparation method and application thereof, the expression formula of the crystal is CayMg11-y(HPO3)8(OH)6-xFx (1<=x<=6, and 0.3<=y<=1), the UV-visible near-infrared band reflectance is greater than 0.95, the emissivity at atmospheric window is greater than 0. 90, and a certain emission selectivity is shown in a long-wave range. Based on magnesium acetate tetrahydrate, calcium acetate monohydrate, sodium fluoride and phosphorous acid as raw materials, the passive refrigeration crystal is prepared by a hydrothermal method by adding cyclohexylamine. The passive refrigeration coating is prepared by utilizing the passive refrigeration crystal, the surface temperature is 5 DEG C lower than theenvironment temperature at the moment of high noon with direct solar radiation, the surface temperature of the wall surface of a building can be effectively reduced, and the reduced amplitude can be by more than 7 DEG C. The crystal material can alleviate the urban heat island effect to a certain extent.

Description

technical field [0001] The invention belongs to the field of crystal materials, and in particular relates to a passive refrigeration crystal, a passive refrigeration coating and a preparation method and application thereof. Background technique [0002] With the continuous advancement of the urbanization process, a large number of urban structures appear and become denser. Due to the low specific heat capacity of these structures (such as concrete, asphalt pavement, and building walls), they absorb heat quickly, especially in sunny and hot summers, causing the surfaces of these structures to absorb a large amount of heat and heat up rapidly. The high-temperature air flow at the surface enters the atmosphere in the form of turbulence, which increases the temperature of the city and causes a serious urban heat island effect. There is no doubt that the excessively high temperature urban environment has brought many inconveniences to the production and life of citizens, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B7/10C09D127/16C09D7/61B05D7/24E04B1/76
CPCY02A30/60
Inventor 张志杰刘德芳钟明峰段瑞
Owner SOUTH CHINA UNIV OF TECH
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