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Method for preparing super-hydrophobic radiation refrigeration material through in-situ extraction of silicon dioxide microspheres from rice hull ash and super-hydrophobic radiation refrigeration material

A technology of silicon dioxide and radiation refrigeration, applied in the direction of silicon dioxide, silicon oxide, heating to dry solid materials, etc., can solve the problems of large energy consumption, shedding, pollution, etc., to improve the performance of radiation refrigeration, and achieve good radiation refrigeration effect. Effect

Inactive Publication Date: 2021-07-02
王文朋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem that the silicon dioxide prepared by the existing method has a large particle size, it needs to consume a lot of energy, and it will cause certain pollution, and the silicon dioxide has a certain degree of hydrophilicity, and the silicon dioxide coating is compatible with devices or devices that require refrigeration. The adhesion and fixing force between materials is weak, and it is easy to fall off with the passage of time or repeated deformation

Method used

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  • Method for preparing super-hydrophobic radiation refrigeration material through in-situ extraction of silicon dioxide microspheres from rice hull ash and super-hydrophobic radiation refrigeration material
  • Method for preparing super-hydrophobic radiation refrigeration material through in-situ extraction of silicon dioxide microspheres from rice hull ash and super-hydrophobic radiation refrigeration material
  • Method for preparing super-hydrophobic radiation refrigeration material through in-situ extraction of silicon dioxide microspheres from rice hull ash and super-hydrophobic radiation refrigeration material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of silica microspheres: After washing the rice husk with water, drying, pulverizing and sieving, adding hydrochloric acid with a concentration of 3%, the mass ratio of the rice husk to hydrochloric acid is 0.5:1, at 50°C Stir fully under water, wash with water until the pH value is neutral, and obtain rice husk ash after filtering and drying; get 30g of rice husk ash, mix evenly with 4wt% NaOH solution in a ratio of 1:5 according to the mass ratio, and heat to Reflux at 90°C for 2 hours, filter while it is hot, and transfer the filtrate to the carbonization tube; place the carbonization tube in a constant temperature device at 90°C, pass simulated lime kiln gas into the carbonization tube for carbonization reaction for 85 minutes, and lower the temperature to room temperature after carbonization Aging for 2 hours, filtering again, washing the filtered filter cake with water until the pH value is neutral, raising the temperature to 110°C and drying for 11 ...

Embodiment 2

[0033] (1) Preparation of silica microspheres: After washing the rice husk with water, drying, pulverizing and sieving, adding hydrochloric acid with a concentration of 5%, the mass ratio of the rice husk to hydrochloric acid is 0.55:1, at 52°C Stir fully under water, wash with water until the pH value is neutral, obtain rice husk ash after filtering and drying; get 32g of rice husk ash, mix evenly with 4wt% NaOH solution according to the mass ratio of 1:6, and heat to Reflux at 94°C for 2.2 hours, filter while it is hot, and transfer the filtrate to the carbonization tube; place the carbonization tube in a constant temperature device at 91°C, pass simulated lime kiln gas into the carbonization tube for carbonization reaction for 87 minutes, and lower the temperature to room temperature after carbonization Aging at low temperature for 2.4 hours, filtering again, washing the filtered filter cake with water until the pH value is neutral, raising the temperature to 114°C and dryin...

Embodiment 3

[0037] (1) Preparation of silica microspheres: After washing the rice husk with water, drying, pulverizing and sieving, adding hydrochloric acid with a concentration of 7%, the mass ratio of the rice husk to hydrochloric acid is 0.6:1, at 54°C Stir fully under water, wash with water until the pH value is neutral, obtain rice husk ash after filtering and drying; get 34g rice husk ash, mix evenly with 4wt% NaOH solution according to the ratio of 1:7 according to the mass ratio, and heat to Reflux at 98°C for 2.4 hours, filter while it is hot, and transfer the filtrate to the carbonization tube; place the carbonization tube in a constant temperature device at 92°C, pass simulated lime kiln gas into the carbonization tube for carbonization reaction for 89 minutes, and lower the temperature to room temperature after carbonization Aging at low temperature for 2.8 hours, filtering again, washing the filtered filter cake with water until the pH value is neutral, raising the temperature...

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Abstract

The invention provides a method for preparing a super-hydrophobic radiation refrigeration material by in-situ extraction of silicon dioxide microspheres from rice hull ash and the super-hydrophobic radiation refrigeration material, and belongs to the technical field of passive refrigeration. The problems that silicon dioxide prepared through an existing method is large in particle size and large in energy dissipation amount, pollution is caused, and a silicon dioxide coating layer is weak in adhesion fixing force and prone to deformation and falling off are solved. The preparation method comprises the steps: performing carbonization treatment on the rice hull ash to prepare silicon dioxide microspheres, adding ethanol and polydimethylsiloxane to form a silicon dioxide microsphere emulsion, soaking and air-drying to obtain the radiation refrigeration flexible material; and then sequentially entering a silicon dioxide coating emulsion and a PVDF-HFP / FAS solution, and drying at high temperature to obtain the super-hydrophobic radiation refrigeration flexible material. According to the invention, the flexible material is immersed in the silicon dioxide microsphere emulsion, so that the flexible material has radiation refrigeration capability, the surface of the radiation refrigeration flexible material is coated with a layer of polysiloxane, the waterproofness and rubbing resistance of the radiation refrigeration flexible material are enhanced, a large amount of energy is not required to be consumed in the preparation process, and the method is relatively green and pollution-free.

Description

technical field [0001] The invention relates to the technical field of passive refrigeration, in particular to a method for preparing a superhydrophobic radiation refrigeration material by in-situ extraction of silicon dioxide microspheres from rice husk ash and the superhydrophobic radiation refrigeration material. Background technique [0002] With the development of information technology, after smart phones, relying on sensors and wireless communication technology, some functions of mobile devices are integrated into traditional and wireless communication technologies, and some functions of mobile devices are integrated into traditional daily wearable products. Follow hot spots. Wearable technology has subverted the traditional machine structure and completely liberated people's hands that have been occupied by computers, mobile phones and other hardware devices for many years when conducting information communication, bringing users a new operating experience and making...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C09D1/00C09D127/16C09D183/04F26B3/00
CPCC01B33/18C01P2004/32C09D1/00C09D127/16C09D183/04F26B3/00
Inventor 王文朋黄元磊修彦民王新宇蒋孟格高继慧周伟
Owner 王文朋
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