Preparation method of silicon dioxide aerogel thermal insulation filler

A technology of silica and thermal insulation fillers, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of reduction, micropores are easily blocked, thermal insulation performance, etc., and achieve simple production process and good thermal insulation performance. Effect

Active Publication Date: 2020-09-01
上海中南建筑材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that when the existing silica airgel is used as the thermal insulation filler, the micropores are easily blocked and the thermal insulation performance is reduced, the present invention develops a preparation method of the silica airgel thermal insulation filler with a core-shell structure

Method used

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  • Preparation method of silicon dioxide aerogel thermal insulation filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1). Dissolve 1 kg of inorganic foaming agent ammonium bicarbonate in 20 kg of water, then add 10 kg of silica airgel, stir and mix evenly, so that the inorganic foaming agent is fully filled into the micropores of silica airgel , filter to remove excess liquid, pre-block the pores, and obtain non-porous silica airgel;

[0027] (2). Add 1kg of paraffin wax to a reaction kettle at 70°C, heat and melt, add 0.5kg of calcium chloride and grind it evenly, spray it on the surface of 30kg of non-porous silica airgel prepared in step (1), and then add it to Stir in 120kg of water, add 1kg of HTK-5040 to completely disperse the paraffin-coated silica airgel in water to obtain a dispersion system;

[0028] (3). Add sodium carbonate to the dispersion system described in (2) to obtain a saturated solution, and stir until the calcium chloride and sodium carbonate in the paraffin coated on the surface of the silica airgel form a calcium carbonate coating layer, centrifugally filtere...

Embodiment 2

[0030](1). Dissolve 2kg of inorganic foaming agent ammonium bicarbonate in 20kg of water, then add 12kg of silica airgel, stir and mix evenly, so that the inorganic foaming agent is fully filled into the micropores of silica airgel , filter to remove excess liquid, pre-block the pores, and obtain non-porous silica airgel;

[0031] (2). Add 1kg of paraffin wax to a reaction kettle at 70°C, heat and melt, add 1kg of calcium chloride and grind it evenly, spray it on the surface of 32kg of non-porous silica airgel prepared in step (1), and then add it to 150kg Stir in water, add 1kg of HTK-5040 to completely disperse the paraffin-coated silica airgel in water to obtain a dispersion system;

[0032] (3). Add sodium carbonate to the dispersion system described in (2) to obtain a saturated solution, and stir until the calcium chloride and sodium carbonate in the paraffin coated on the surface of the silica airgel form a calcium carbonate coating layer, centrifuged and dried at 80°C ...

Embodiment 3

[0034] (1). Dissolve 1.5kg of inorganic foaming agent ammonium bicarbonate in 20kg of water, then add 15kg of silica airgel, stir and mix evenly, so that the inorganic foaming agent can be fully filled into the microspheres of silica airgel In the pores, the excess liquid is removed by filtration, and the pores are pre-blocked to obtain non-porous silica airgel;

[0035] (2). Add 1kg of paraffin wax to a reaction kettle at 60°C, heat and melt, add 0.5kg of calcium chloride and grind it evenly, spray it on the surface of 35kg of non-porous silica airgel prepared in step (1), and then add it to Stir in 100kg of water, add 1kg of HTK-5040 to completely disperse the paraffin-coated silica airgel in water to obtain a dispersion system;

[0036] (3). Add sodium carbonate to the dispersion system described in (2) to obtain a saturated solution, and stir until the calcium chloride and sodium carbonate in the paraffin coated on the surface of the silica airgel form a calcium carbonate ...

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Abstract

The invention belongs to the technical field of silicon dioxide aerogel thermal insulation materials, and particularly relates to a preparation method of a silicon dioxide aerogel thermal insulation filler. The preparation method comprises the following steps: dissolving an inorganic foaming agent in water, adding silicon dioxide aerogel, and uniformly stirring and mixing to obtain nonporous silicon dioxide aerogel; melting paraffin at 50-70 DEG C, uniformly grinding the paraffin and calcium chloride, spraying the obtained mixture on the surface of the prepared nonporous silicon dioxide aerogel, adding the sprayed nonporous silicon dioxide aerogel into water, stirring, and adding an inorganic dispersing agent to completely disperse the silicon dioxide aerogel of which the surface is coatedwith the paraffin in the water to obtain a dispersion system; and adding sodium carbonate into the dispersion system, stirring until calcium chloride in the paraffin coated on the surface of the silicon dioxide aerogel and sodium carbonate form a calcium carbonate coating layer, centrifugally filtering, and drying at 60-80 DEG C for 15-24 hours to obtain the silicon dioxide aerogel thermal insulation filler.

Description

technical field [0001] The invention belongs to the technical field of silica airgel thermal insulation materials, and in particular relates to a preparation method of silica airgel thermal insulation filler. Background technique [0002] Silica airgel is a new type of porous functional material with solid phase particles and pores at the nanometer scale. It has light weight, translucency, high specific surface area, high porosity, low sound propagation velocity, low dielectric constant and Excellent properties such as extremely low thermal conductivity have broad application prospects in the fields of chemistry, thermals, acoustics, optics, electricity, etc., especially in high-efficiency heat insulation materials, adsorption materials, chemical catalysts and their carriers. The application of silica airgel is mostly filled in the insulation material in the form of insulation filler, which has the effect of heat insulation. However, due to the large porosity of silica airg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/10C09C3/06C08K9/10C08K7/26C08L21/00
CPCC08K7/26C08K9/10C08L2203/18C09C1/28C09C3/006C09C3/063C09C3/10C08L21/00
Inventor 陈庆陈巧和司文彬陈涛
Owner 上海中南建筑材料有限公司
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