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Method using sodium silicate as silicon source to produce aerogel composite material

A composite material and sodium silicate technology, which is applied in applications, household utensils, ceramic products, etc., can solve problems such as complex processes, and achieve the effects of simple process, easy arrangement for assembly line operations, and high hydrophobicity

Inactive Publication Date: 2018-09-14
山西天一纳米科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of airgel composite insulation materials includes methods such as dry powder lamination, gel monomer polymerization, and wet gel aging replacement, and the processes are very complicated.

Method used

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  • Method using sodium silicate as silicon source to produce aerogel composite material
  • Method using sodium silicate as silicon source to produce aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Raw material preparation, sodium silicate modulus is 3.3-3.4, iron content <200PPm, concentration 4%; sulfuric acid concentration is 15%;

[0027] 2) The sodium silicate and sulfuric acid in step 1) are poured into the pipeline mixer at the same time to obtain a mixed solution with a pH value of 7.4;

[0028] 3) Spray the mixed solution on the ceramic fiber, make the mixed solution completely permeate the ceramic fiber, and leave it for 30 minutes to obtain the pre-composite material;

[0029] 4) Submerge the pre-composite material in ethanol for replacement;

[0030] 5) Surface modification of the pre-composite material after replacement, the surface modification agent is a mixture of hexamethyldisiloxane and concentrated hydrochloric acid, the temperature is 60°C, and the time is 8h;

[0031] 6) After the modification is completed, the airgel composite material is obtained by drying.

Embodiment 2

[0033] 1) Raw material preparation, sodium silicate modulus is 3.3-3.4, iron content <200PPm, concentration 8%; sulfuric acid concentration is 18%;

[0034] 2) The sodium silicate and sulfuric acid in step 1) are poured into the pipeline mixer at the same time to obtain a mixed solution with a pH value of 8;

[0035] 3) Spray the mixed solution on the ceramic fiber, make the mixed solution completely permeate the ceramic fiber, and leave it for 20 minutes to obtain the pre-composite material;

[0036] 4) Submerge the pre-composite material in ethanol for replacement;

[0037] 5) Surface modification of the pre-composite material after replacement, the surface modification agent is a mixture of hexamethyldisiloxane and concentrated hydrochloric acid, the temperature is 60°C, and the time is 9h;

[0038] 6) After the modification is completed, the airgel composite material is obtained by drying.

Embodiment 3

[0040] 1) Raw material preparation, sodium silicate modulus is 3.3-3.4, iron content <200PPm, concentration 2%; sulfuric acid concentration is 10%;

[0041] 2) The sodium silicate and sulfuric acid in step 1) are injected into the pipeline mixer at the same time to obtain a mixed solution with a pH value of 7;

[0042] 3) Spray the mixed solution on the ceramic fiber, make the mixed solution completely permeate the ceramic fiber, and leave it for 15 minutes to obtain the pre-composite material;

[0043] 4) Submerge the pre-composite material in ethanol for replacement;

[0044] 5) Surface modification of the pre-composite material after replacement, the surface modification agent is a mixture of trimethylsilane and concentrated hydrochloric acid, the temperature is 60°C, and the time is 6h;

[0045] 6) After the modification is completed, the airgel composite material is obtained by drying.

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Abstract

The invention relates to a method using sodium silicate as the silicon source to produce an aerogel composite material. The method includes: feeding sodium silicate of certain concentration and ammonium sulfate of certain concentration into a pipeline mixer according to a certain flow rate, allowing the pH of the mixed liquid to be 7-8, spraying the mixed liquid to a composite material through a movable sprayer to exactly completely submerge the composite material, subjecting the material to replacement in an organic alcohol solution when the mixed liquid is integrated with the composite material after coagulation, performing hydrophobic treatment on the material after the replacement, and drying the material with hot air to obtain the aerogel composite material.

Description

technical field [0001] The invention belongs to the heat preservation material preparation technology, in particular to a method for preparing silica airgel composite material by using cheap silicon source sodium silicate. Background technique [0002] In today's environment that pays special attention to environmental protection, thermal insulation materials play a very important role. Silica airgel insulation materials have attracted more and more attention in recent years because of their irreplaceable advantages such as low thermal conductivity, high temperature resistance, low density, and environmental protection. In the field of thermal insulation, people have continued to use organic materials such as ethyl orthosilicate and methyltrimethoxysilane as silicon sources to prepare silica airgel. This process is not only costly, but also relatively polluting. It has not been able to be produced in a large-scale industry, which limits the large-scale promotion and use of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B2201/32C04B14/064C04B14/46C04B38/0045
Inventor 张原僖张伟梁建强赵燕平赵建卿
Owner 山西天一纳米科技股份有限公司
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