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Inorganic fiber powder for radiation cooling and preparation method thereof

An inorganic fiber and radiation cooling technology, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of easy aging and degradation, and achieve the effect of low cost, simple equipment and cost reduction

Inactive Publication Date: 2021-11-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first object of the present invention is to provide an inorganic fiber powder for radiative cooling, using inorganic oxide fibers as the substrate, and randomly distributing ceramic microspheres in the inorganic oxide, which solves the problem of easy aging and degradation of the polymer as the substrate The problem

Method used

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  • Inorganic fiber powder for radiation cooling and preparation method thereof
  • Inorganic fiber powder for radiation cooling and preparation method thereof
  • Inorganic fiber powder for radiation cooling and preparation method thereof

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preparation example Construction

[0036] The preparation method of the above-mentioned inorganic fiber powder for radiative cooling comprises the following steps:

[0037] S1: Add the high polymer to the acetic acid ethanol solution, stir it magnetically for 5 hours, the mass fraction of the high polymer is 2wt%; the acetic acid ethanol solution is a mixed solution of acetic acid and ethanol with a mass ratio of 2:3;

[0038] The high polymer is polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyvinyl alcohol (PVA) or polyvinyl butyral (PVB).

[0039] S2: Add a preset ratio of alkoxide to the polymer gel, and then dropwise add tetraethyl orthosilicate hydrolyzate or other alkoxide or dispersion corresponding to ceramic microspheres to obtain an electrospinning precursor , and vacuum degassing, the mass proportion of alkoxide in the electrospinning precursor solution is 10%-30%, and the volume ratio of tetraethylorthosilicate hydrolyzate to polymer gel is 1:5;

[0040] The alkoxide is one or more of the...

Embodiment 1

[0045] First prepare tetraethyl orthosilicate hydrolyzate, mix tetraethyl orthosilicate, ethanol, 0.1mol / L hydrochloric acid with the volume ratio of 5:5:1 and magnetically stir to obtain tetraethyl orthosilicate hydrolyzate use.

[0046] Then mix acetic acid and ethanol according to the mass ratio of 2:3 and stir evenly, then add 2wt% polyvinylpyrrolidone (PVP) to the acetate-ethanol mixed solution, and stir thoroughly for 5 hours to obtain a high polymer sol. In the high polymer sol, add tetratitanium isopropoxide and account for 10% of the total solution mass, and dropwise add tetraethyl orthosilicate hydrolyzate (tetraethyl orthosilicate hydrolyzate and high polymer sol volume ratio are 1:5), and magnetically stirred in a 60°C water bath for 1 h to obtain the electrospinning precursor solution, which was then vacuumed and degassed.

[0047] The electrospinning positive voltage was 20kV, the negative voltage was -2kV, the extrusion speed of the spinning solution was 2mL / h,...

Embodiment 2

[0049] First prepare tetraethyl orthosilicate hydrolyzate, mix tetraethyl orthosilicate, ethanol, 0.1mol / L hydrochloric acid with the volume ratio of 5:5:1 and magnetically stir to obtain tetraethyl orthosilicate hydrolyzate use.

[0050] Then acetic acid and ethanol were mixed and stirred evenly at a mass ratio of 2:3, and then 10 wt% polyvinylpyrrolidone (PVP) was added to the acetate-ethanol mixed solution, and stirred thoroughly for 5 hours to obtain a high polymer sol. In the sol, add tetratitanium isopropoxide, which accounts for 20% of the total solution mass, and add tetraethyl orthosilicate hydrolyzate drop by drop (the volume ratio of tetraethyl orthosilicate hydrolyzate and high polymer sol is 1:5 ), and magnetically stirred in a water bath at 60° C. for 1 h to obtain an electrospinning precursor solution, which was then vacuumed and degassed.

[0051] The positive voltage of electrospinning was 20kV, the negative voltage was -2kV, the extrusion speed of the spinni...

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Abstract

The invention discloses inorganic fiber powder for radiation cooling and a preparation method thereof. The inorganic fiber powder comprises oxide fibers and ceramic microspheres randomly distributed on the oxide fibers. The preparation method comprises the following steps of S1, preparing high polymer gel; S2, adding alkoxide into the high polymer gel according to a preset proportion, dropwise adding dispersion liquid to obtain an electrostatic spinning precursor solution, and performing vacuumizing; S3, performing electrostatic spinning on the electrostatic spinning precursor solution in the step S2 to obtain an organic-inorganic composite fiber film, and performing heating treatment in a vacuum environment; and S4, putting the organic-inorganic composite fiber film subjected to heating treatment in the step S3 into a muffle furnace for sintering treatment, and then performing grinding to obtain the inorganic fiber powder. The obtained powder has the reflectivity reaching up to 95% in the visible near-infrared band (0.25-2.5 microns) and the emissivity of 90% or above in the atmospheric window band (8-13 microns), and meanwhile, the powder is good in stability, safe, reliable and relatively high in practicability.

Description

technical field [0001] The invention belongs to the technical field of radiation cooling, and in particular relates to an inorganic fiber powder used for radiation cooling and a preparation method thereof. Background technique [0002] With the growth of world population and continuous economic and social development, the world's energy consumption is increasing day by day. According to statistics, currently in the world, building energy consumption accounts for about 40% of the world's total energy consumption (about 25% in my country, in 2016). In building energy consumption, HVAC system energy consumption occupies the first place. Traditional refrigeration equipment such as refrigerators and air conditioners rely on vapor compression refrigeration to achieve cooling effects. This process will cause global warming and urban heat island effects due to the extensive use of refrigerants (mainly hydrofluorocarbons), and consume a lot of electricity. At present, most countrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10
CPCD01F9/10
Inventor 周涵付恒泰肖诚禹孙娅
Owner SHANGHAI JIAO TONG UNIV
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