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Composite raw gas gel thermal insulation material and preparation method

A technology of thermal insulation materials and gels, which is applied in the field of preparation of composite aerogel thermal insulation materials, and can solve the problems of reducing the thermal conductivity of composite materials and uneven mixing.

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of uneven mixing in the preparation process of the existing composite thermal insulation material, and provides a preparation method of the composite primary airgel thermal insulation material, so as to fully exert the light-shielding effect of the opacifier in the composite material and the mechanical enhancement performance of the fiber, while reducing the thermal conductivity of the composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1, preparation of silica sol: Weigh 146.44g of TEOS, 161.92g of ethanol, 189.79g of deionized water, 14.06mL of nitric acid (1mol / L), and 0.95g of formamide, (the molar ratio is 1:5:15:0.02: 0.03), stirred at 30°C to prepare silica sol.

[0024] Step 2, preparation of aluminum sol: Weigh 227.84g of boehmite powder and 262.95g of deionized water to form a suspension, heat to 85°C and stir vigorously, add 1mol / L nitric acid 146.09mL (boehmite: deionized The molar ratio of ionized water: nitric acid is 1:5:0.05), under the conditions of vigorous stirring and reflux at 85°C for 5 hours to prepare γ-Al-OOH sol.

[0025] Step 3, material mixing: Weigh 450g of silica sol and 350g of aluminum sol and mix, add 180g of zirconium silicate and 20g of high silica glass fiber, and stir evenly. The particle size of zirconium silicate is 3-5 μm, the fiber diameter is 7 μm, and the length is 20 mm.

[0026] Step 4, gelation and aging: the mixed material was left to stand at 60° C...

Embodiment 2

[0030] Step 1, preparation of silica sol: Weigh 121.77g of TEOS, 269.29g of ethanol, 105.21g of deionized water, 29.23mL of sulfuric acid (1mol / L), 0.85g of N,N-dimethylformamide, (the molar ratio is 1 :10:10:0.05:0.02), stirring at 30°C to prepare silica sol.

[0031] Step 2, preparation of aluminum sol: Weigh 149.31g of boehmite powder and 344.65g of deionized water to form a suspension, heat to 85°C and stir vigorously, add 95.73mL of 1mol / L nitric acid (boehmite: deionized The molar ratio of ionized water: nitric acid is 1:10:0.05), under the condition of vigorous stirring and reflux for 7.5h at 80°C, the γ-Al-OOH sol was prepared.

[0032] Step 3, material mixing: weigh 350g of silica sol and 300g of aluminum sol and mix, add 320g of silicon carbide and 30g of ceramic fiber, and stir evenly. The silicon carbide particle size is 5-10 μm, the fiber diameter is 10 μm, and the length is 30 mm.

[0033] Step 4, gelation and aging: the mixed material was left to stand at 65° ...

Embodiment 3

[0037] Step 1, preparation of silica sol: Weigh 106.65g of TEOS, 353.77g of ethanol, 36.86g of deionized water, 30.71mL of hydrochloric acid (1mol / L), 1.60g of dimethyl sulfoxide, (the molar ratio is 1:15:4 :0.06:0.04), stirring at 30°C to prepare silica sol.

[0038] Step 2, preparation of aluminum sol: Weigh 104.73g of pseudoboehmite powder and 386.80g of deionized water to form a suspension, heat to 85°C and stir vigorously, add 134.26mL of 1mol / L nitric acid (pseudoboehmite The molar ratio of alumina stone: deionized water: nitric acid is 1:16:0.1), and refluxed for 10 hours under the condition of vigorous stirring and 75°C to prepare γ-Al-OOH sol.

[0039] Step 3, material mixing: weigh 500g of silica sol and 260g of alumina sol and mix, add 220g of titanium dioxide and 20g of ceramic fiber, and stir evenly. The titanium dioxide particle size is 10-15 μm, the fiber diameter is 3 μm, and the length is 20 mm.

[0040] Step 4, gelation and aging: the mixed material was lef...

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Abstract

The invention provides a preparation method of a composite raw gas gel thermal insulation material. The preparation method comprises the following steps: (1)preparing silica sol: preparing the silicasol by taking tetraethoxysilane as a precursor; (2)preparing aluminum sol: preparing gamma-Al-OOH sol by utilizing aluminum-containing powder; (3) mixing materials: mixing the silica sol and the alumina sol, adding infrared opacifier particles and reinforcing fibers, and uniformly stirring; (4)gelatinizing and aging: standing and aging the mixed material; and (5) performing drying and heat treating: drying the aged material under normal pressure, and placing the dried material in a mold for compression molding. The infrared opacifier and the reinforcing fibers are added in the sol forming process, the system is dispersed more uniformly, the mechanical reinforcing effect of the fibers on the material and the shading effect of the opacifier are brought into full play, meanwhile, solid-phaseheat transfer caused by mutual contact of particles is avoided, and the heat conductivity is reduced.

Description

technical field [0001] The invention belongs to the technical field of nano thermal insulation materials, in particular to a preparation method of a composite airgel thermal insulation material grown in situ with ultra-low thermal conductivity. Background technique [0002] Industrial energy consumption is the first among the three major energy-consuming industries in China. The use of thermal insulation and refractory materials in petrochemical, metallurgy, electric power and other industrial furnaces and high-temperature equipment is an important way to achieve energy saving and consumption reduction. Traditional thermal insulation refractory materials include lightweight bricks, lightweight castables, refractory fibers, etc. Due to their relatively high thermal conductivity, they cannot meet the energy-saving requirements of the outer wall temperature of industrial equipment below 70°C under a given thickness, so low thermal conductivity is required. high-efficiency therm...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B38/00
CPCC04B28/24C04B2201/32C04B14/303C04B14/046C04B14/42C04B38/0045C04B14/324C04B14/46C04B14/305
Inventor 程谟杰王秀玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI