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Method for preparing silica aerogel composite material by adopting chloride-free and alcohol-free process

A technology of composite materials and silicon dioxide, applied in applications, household utensils, ceramic products, etc., can solve the problems of increased cost and difficulty of anti-corrosion

Active Publication Date: 2018-07-24
SHENZHEN AEROGEL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of chloride ions increases the cost and difficulty of equipment anticorrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing a silica aerogel composite material using a chlorine-free and alcohol-free process includes the following steps:

[0047] (1) Preparation of gel:

[0048] S1. Take 500ml water glass and add 800ml water to dilute, stir evenly to obtain an aqueous solution of water glass; take 50ml concentrated H 2 SO 4 The solution is diluted with 500ml water to obtain the diluted H 2 SO 4 Solution, add the water glass solution to the diluted H 2 SO 4 In the solution, add and stir to control the pH of the mixed solution at 3.0, then perform ion exchange resin desalination treatment on the mixed solution, add additives, and stir evenly to obtain the first mixed solution;

[0049] The added amount of the additive is 1‰ of the weight of the silica aerogel composite material, and the inorganic additive is iron oxide.

[0050] (2) Compound:

[0051] S2. Immerse the glass fiber material in the first mixed solution for a period of time, wait for the first mixed solution to complete...

Embodiment 2

[0063] A method for preparing a silica aerogel composite material using a chlorine-free and alcohol-free process includes the following steps:

[0064] (1) Preparation of gel:

[0065] S1. Dilute potassium silicate with water to obtain a potassium silicate aqueous solution, wherein the volume ratio of potassium silicate to water is 1:5; for HNO 3 Add water to dilute, and add the water-soluble silicon source aqueous solution to the diluted HNO 3 In the solution, the double-membrane method is used for pretreatment and desalination, and inorganic additives are added and stirred evenly to obtain a first mixed solution; the added amount of inorganic additives is 1.5% of the weight of the silica aerogel composite material, so The inorganic additive is carbon black.

[0066] (2) Dipping:

[0067] S2. Immerse the fiber-reinforced material in the first mixed solution and leave it to stand for 24 hours at 35° C. to obtain a composite gel, wherein the volume ratio of the first mixed solution to ...

Embodiment 3

[0079] A method for preparing a silica aerogel composite material using a chlorine-free and alcohol-free process includes the following steps:

[0080] (1) Preparation of gel:

[0081] S1. Dilute sodium metasilicate with water to obtain an aqueous solution of sodium metasilicate, wherein the volume ratio of sodium metasilicate to water is 1:3; for H 3 PO 4 Add water to dilute, and add the water-soluble silicon source aqueous solution to the diluted H 3 PO 4 In the solution, after freezing and crystallizing the salt in an environment of 5°C, adding inorganic additives and stirring them evenly to obtain the first mixed solution;

[0082] The amount of the added inorganic additive is 1% of the weight of the silica aerogel composite material, and the inorganic additive is titanium dioxide.

[0083] (2) Dipping:

[0084] S2. Immerse the fiber reinforced material in the first mixed solution and let it stand at 70°C. Take it out after forming a composite gel.

[0085] (3) Aging

[0086] The com...

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Abstract

The invention discloses a method for preparing a silica aerogel composite material by adopting a chloride-free and alcohol-free process. The method comprises the following steps: S1, adopting a water-based silicon source as a raw material, regulating the pH value of sol with a chloridion-free acid, adding an additive after desalting, and uniformly stirring to obtain a first mixed solution; S2, immersing a fiber reinforced material into the first mixed solution, and completing gel curing; S3, standing the obtained composite gel material so as to obtain an aged composite gel material; S4, placing the aged composite gel material in a chloride-free and alcohol-free displacer to realize uniform solution infiltration; S5, performing surface methylsilane modification on the composite gel by usinga chloride-free surface modifier; S6, drying the modified composite gel, thereby obtaining the silica aerogel composite material. The invention provides a method for preparing the silica aerogel composite material without any chloride ion or alcohol substance in the formula.

Description

Technical field [0001] The invention relates to the field of preparing silica aerogel composite materials. More specifically, the present invention relates to a method for preparing a silica aerogel composite material using a chlorine-free and alcohol-free process. Background technique [0002] Silica aerogel is a new type of nano, porous, low-density, amorphous material with a continuous three-dimensional network structure. The porosity of silica aerogel is as high as 80%-99%, and the typical size of the pores is 1-100nm. It has the advantages of low refractive index, small Young's modulus, low acoustic impedance, low thermal conductivity and strong adsorption performance. It exhibits unique properties in chemistry, heat, optics, acoustics, and electricity. Silica aerogel has been put into use at home and abroad, and the domestic industrialization scale is increasing rapidly. It has been put into use in many fields such as petrochemical industry, heat pipe network, new energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B2201/32C04B2201/50C04B14/064C04B14/42C04B14/308C04B24/42C04B14/4656C04B14/022C04B20/0048C04B14/305
Inventor 王天赋陈庚
Owner SHENZHEN AEROGEL TECH CO LTD
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