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Method for preparing porous insulation material by microwave heating alkali metal silicate

An alkali metal silicate, thermal insulation material technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of large toxic waste gas emission, low energy utilization rate, complex process production, etc., and achieve uniform pore distribution. , The price of raw materials is cheap, and the process is simple.

Inactive Publication Date: 2012-03-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing process has problems such as low energy utilization rate, large amount of toxic waste gas emissions, complex process production, high equipment requirements, and long production cycle.

Method used

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  • Method for preparing porous insulation material by microwave heating alkali metal silicate
  • Method for preparing porous insulation material by microwave heating alkali metal silicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of raw materials: with the modulus as n=2.2, Na 2 O mass fraction 10.85%, SiO 2 100ml of water glass with a mass fraction of 24.15% is a raw material;

[0033] (2) Forming: directly add the above raw materials into the cylindrical ceramic mould;

[0034] (3) Heating method: use a frequency of 2450MHz, a power of 800W, and heat for 12 minutes;

[0035] (4) Demoulding step: take out the ceramic mold and demould.

[0036] The sample density is ρ=45kg / m 3 , the thermal conductivity is 0.041W / m·K, the compressive strength is 0.38MPa, and it has good heat insulation performance.

Embodiment 2

[0038] (1) Preparation of raw materials:

[0039] ——with modulus n=3.2, Na 2 O mass fraction 9.3%, SiO 2 The water glass 100ml of mass fraction 20.8% is raw material,

[0040] ——Take 2 g of aluminum silicate fiber (2-5 mm in length) sheared by a machine, add water glass and stir rapidly;

[0041] (2) molding: the raw material of step (1) is directly added in the cylindrical ceramic mould;

[0042] (3) Heating method: microwave heating with a frequency of 2450MHz and a power of 680W for 10 minutes;

[0043] (4) Demoulding step: take out the ceramic mold and perform demoulding.

[0044] The sample density is ρ=80kg / m 3, when the temperature is 200°C, the thermal conductivity λ=0.045W / m·K, has good heat insulation performance; the compressive strength reaches 0.72MPa; after sintering at 400°C, the linear shrinkage rate is 1.85×10 -6 m / °C.

Embodiment 3

[0046] (1) Preparation of raw materials:

[0047] Take 20g of anhydrous sodium metasilicate, add 50ml of water glass (the modulus is n=3.2, the mass percentage of alkali metal silicate is 30%), 0.38g of opacifying agent carbon powder, and stir evenly.

[0048] (2) molding: the raw material of step (1) is directly added in the cylindrical ceramic mould;

[0049] (3) Heating method: Put it in a microwave oven with a frequency of 2450 MHz and a power of 800W, and heat for 7 minutes;

[0050] (4) Demoulding step: take out the ceramic mold and perform demoulding.

[0051] The sample is gray-black, with a density of ρ=67.9kg / m 3 , Thermal conductivity λ=0.055W / m·K.

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Abstract

The invention relates to a method for preparing a porous foam insulation material by microwave heating alkali metal silicate, which is characterized in that alkali metal silicate is directly heated by microwave for producing an insulation material with low heat conduction coefficient and the usage temperature of -200 DEG C<=T<=1100 DEG C. The method for preparing porous insulation material by microwave heating alkali metal silicate enables uniform heating from the outside to inside of the raw material, which solves the problems of uneven heating of the raw material, environmental pollution and high dissipating energy caused by heating a heating furnace from outside to inside. The produced material can be used for direct usage after microwave foaming, and enables long-term usage when the temperature is lower than 450 DEG C; the usage temperature of the prepared porous foam insulation material can be raised to 1100 DEG C after being treated by acid. The method of the invention has the advantages of simple production technology, short production period; simultaneously the material has the merits of good heat insulation performance and low density. The inorganic insulation material has excellent fireproof function, and can be used for building insulation as well as external layer insulation for kilns and heating furnaces.

Description

technical field [0001] The invention belongs to the field of producing porous thermal insulation materials, and in particular relates to a method for producing porous thermal insulation materials by heating an aqueous solution of alkali metal silicate with microwaves. Background technique [0002] Energy saving and emission reduction is the trend of industrial development. Insulation materials are used in large quantities, requiring rich and cheap raw materials. Building insulation materials require materials to have good fire protection function; airgel insulation materials with medium and high temperature and low thermal conductivity are limited in use due to their complicated process and high price. Therefore, it is a new trend in the development of thermal insulation materials to look for an inorganic thermal insulation material with low price and excellent thermal insulation performance. Inorganic thermal insulation building materials have not been applied on a large ...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B28/24C04B28/26
Inventor 金江蒋晓勇张华练国峰
Owner NANJING UNIV OF TECH
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