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Method for preparing alumina nanometer porous thermal insulation materials

A nano-alumina, heat-insulating material technology, applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of expensive raw materials, low strength, easy to form precipitation, etc., and achieve simple and feasible preparation methods and excellent heat insulation performance Good, uniform pore structure

Active Publication Date: 2013-10-30
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is complicated, such as the hydrolysis reaction is rapid and difficult to control, and it is easy to form precipitates; there are many factors affecting the reaction, such as the type, amount, reaction temperature, additives, etc. of the solvent; at the same time, there are organic raw materials that are sensitive to water, expensive raw materials and flammable. Toxic and many other issues
It is also possible to use inorganic aluminum salts as precursors to prepare alumina nanoporous materials, such as patent CN102145994A (CN102145994A 2011.08.10), which uses inorganic aluminum salts as precursors, a mixed solution of absolute ethanol and water as solvents, and epoxy As a gel network inducer, the sol is prepared by the sol-gel method, and then the transparent block alumina airgel is prepared by supercritical drying, although the obtained block alumina airgel has the characteristics of large specific surface area , but low strength, poor high temperature performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 40g of nano-alumina powder and 80g of ethanol, and pre-disperse the nano-alumina powder in ethanol with a high-speed mixer; add 0.2g of potassium hexatitanate and 0.2g of PEG600 to the above-mentioned pre-dispersion, and stir at a high speed to obtain a stable Uniform suspension; add 18g of prepared TEOS hydrolyzate dropwise to the stirring ethanol suspension, after stirring for 30 minutes, add 0.1g of dilute hydrochloric acid as a catalyst, stir evenly, after 20 minutes, the system gels, and the obtained wet The gel is left to age for 72 hours and replaced with ethanol solvent 5 to 10 times; the treated wet gel is dried; it can be kept in a drying oven at a temperature of 50°C and dried for 72 hours to obtain an alumina nanoporous thermal insulation material.

Embodiment 2

[0018] Mix 40g of nano-alumina powder and 40g of acetone, and pre-disperse the nano-alumina powder in acetone with a high-speed mixer; add 13.3g of potassium hexatitanate and 0.2g of PEG600 to the above-mentioned pre-dispersion, and stir at a high speed to obtain a stable Uniform suspension; add 2g of the prepared TEOS hydrolyzate dropwise to the stirring suspension, stir for 30 minutes, add 0.1g of dilute nitric acid as a catalyst, stir evenly, after 20 minutes, the system gels, and the obtained wet coagulation After static aging for 72 hours, the gel was replaced with ethanol solvent 5 to 10 times; the treated wet gel was dried; it could be kept in a drying oven at a temperature of 50°C and dried for 72 hours to obtain an alumina nanoporous thermal insulation material.

Embodiment 3

[0020] Mix 40g of nano-alumina powder and 20g of methanol, and pre-disperse the nano-alumina powder in methanol with a high-speed mixer; add 0.2g of potassium hexatitanate and 0.2g of diethanolamide to the above pre-dispersion, and stir at a high speed Obtain a stable uniform suspension; add 10 g of the ethanol solution of propylene oxide and aluminum chloride dropwise to the stirring methanol suspension, stir evenly, and after 10 minutes, the system gels, and the obtained wet gel passes through Stand for aging for 72 hours, replace with ethanol solvent 5 to 10 times; dry the treated wet gel; keep the temperature in a drying oven at 50°C and dry for 72 hours to obtain an alumina nanoporous thermal insulation material.

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PUM

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Abstract

The invention provides a method for preparing alumina nanometer porous thermal insulation materials, which belongs to the field of nanometer porous thermal insulation materials. The process includes that: evenly dispersing nanometer alumina powder into ethanol and other organic solvents in a method combining mechanical dispersing and chemical dispersing so as to prepare even organic suspension, and then adding a certain amount of prepared gel into the organic suspension dropwise, and adding catalyst with a certain proportion so as to lead the gel to have condensation polymerization to obtain system gel. The wet gel stands for aging, is replaced by absolute ethyl alcohol solvent and is dried under normal pressure or under supercritical condition so as to obtain aerogel thermal insulation materials of alumina. The method for preparing alumina nanometer porous thermal insulation materials has the advantages that the preparing method is simple and practicable, and the prepared nanometer porous materials are strong in strength, even in pore structure, good in thermal insulation performance and capable of being used at 1100 DEG C.

Description

technical field [0001] The invention relates to a preparation method of an aluminum oxide nanoporous heat insulating material, belonging to the field of nanoporous heat insulating materials. technical background [0002] Energy saving is a long-term development strategy for my country's sustainable development and a basic national policy of our country. With the increasing development of science and technology, the purpose of heat insulation and energy-saving technology as one of the energy-saving measures is to reduce heat loss, save fuel, improve the working environment, ensure safe production, and improve work efficiency. Adopting new technologies and processes to develop environmentally friendly heat insulation materials is the most effective and economical measure to save energy, and can be widely used in energy power, machinery manufacturing, petrochemicals, material metallurgy, low-temperature refrigeration, industrial buildings and transportation Transportation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 孙小飞李红霞王刚王冬冬王健东孙加林
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES