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Nano porous high-temperature-insulating material taking thixotropic colloid as template agent and preparation method for high-temperature-insulating material

A nano-porous, heat-insulating material technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of easy breakage, high price of nano-powder, large investment in equipment, etc., and achieve the effect of high compatibility

Inactive Publication Date: 2016-02-10
浙江圣润纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing airgel materials through sol-gel formation of network nanopores requires special equipment such as supercritical drying equipment, or requires a large amount of organic sol replacement such as ethanol, n-hexane, etc. The process is complicated, the equipment investment is large, and because organic Solvents are flammable, explosive and unsafe
Nano-powder compression molding to prepare nano-porous materials requires dispersion and mixing of different nano-powders. Due to the agglomeration of the nano-powder itself and the difference in density and particle size between the nano-powder and other materials, it is difficult to obtain uniform dispersion, and The resulting product has low strength and is easily broken, which limits the application field
Nano-powder is added with adhesive to make coating. Because the price of nano-powder itself is high, the cost of the obtained product is also high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Take 4.0kg of aluminum sol with a concentration of 40% and dissolve it in 50.0kg of water to prepare diluted aluminum sol, and let it stand for 2 days to obtain translucent thixotropic alumina colloid. The premixed dry material is mixed and stirred according to the following ratio: aluminum oxide hollow microspheres 38.0kg, silica micropowder 8.0kg, silica fume 1.0kg, titanium oxide 0.5kg. The premixed wet material is mixed and stirred according to the following ratio: 54.0kg of alumina colloid, 47.5kg of premixed dry material, 10.0kg of sodium silicate with a modulus of 3.3, and 0.1kg of methyl silicate waterproofing agent. Add 1.0kg of sepiolite fiber to the premixed wet material, pour the resulting viscous paste into the abrasive tool after stirring, dry at 85°C for 3 days, and dry at 110°C for 3 hours to obtain high-temperature insulation bricks with a density of 1040kg / m 3 , strength 11MPa, thermal conductivity 0.14w / m·k.

Embodiment 2

[0077] Dissolve 5.0kg of 30% silica sol in 30.0kg of water to prepare diluted silica sol, and dissolve 4.0kg of 40% aluminum sol in 50.0kg of water to prepare diluted alumina sol. The diluted aluminum sol is placed in a container, and the diluted silica sol is slowly added under stirring at 600 r / min to obtain a translucent thixotropic silica-alumina colloid. The premixed dry material is prepared and mixed as follows: clay ceramsite 15.0kg, vitrified microspheres 8.0kg, fine sand 20.0kg, volcanic ash 1.0kg, zirconium silicate powder 1.0kg. The premixed wet material is mixed and stirred according to the following proportions: high alumina cement 35.0kg, silica-alumina colloid 80.0kg, alumina fiber 1.2kg, polyester fiber 0.2kg and polyvinyl alcohol shrinkage reducer 0.1kg. Pour the obtained slurry into the mold to make bricks. After 28 days of natural curing, the density of the high-temperature insulation bricks is 1560kg / m 3 , strength 14MPa, thermal conductivity 0.18w / m·k.

Embodiment 3

[0079] Take 10.5 kg of magnesium aluminum silicate and add 50.0 kg of water, soak for 24 hours, and then shear and disperse at a speed of 1800 r / min for 3 hours to obtain viscous thixotropic magnesium aluminum silicate colloid. The premixed dry material is mixed and stirred according to the following ratio: 15.0 kg of zirconia hollow microspheres, 8.0 kg of rice husk ash, 1.0 kg of silica fume, and 1.0 kg of potassium hexatitanate whiskers. The premixed wet material is mixed and stirred according to the following ratio: magnesium aluminum silicate colloid 50.0kg, premixed dry material 25.0kg, aluminum dihydrogen phosphate 10.0kg, polyether shrinkage reducer 0.1kg. Lay a layer of carded mullite fiber on the metal track with a thickness of about 1mm, then inject premixed wet material from above, and roll it; then lay a layer of mullite fiber with a thickness of about 1mm, and then inject premixed material from above Wet material, then rolling, repeat the above steps until the fi...

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Abstract

The invention relates to a high-temperature-insulating material and a preparation method therefor and particularly relates to the high-temperature-insulating material, which has a nano porous structure, prepared through forming an aqueous-phase uniform three-dimensional-network nano porous structure by taking thixotropic colloid as a template agent and adding a binding agent, aggregates, powder materials, an opacifier and admixtures. The preparation method for the high-temperature-insulating material, disclosed by the invention, is simple and easy in operation, low in production cost and environment-friendly and safe in process, does not need high-pressure special equipment, is free of combustible and explosive or other harmful substances and is beneficial to mass production. The high-temperature-insulating material disclosed by the invention has the characteristics of light weight, high strength and low coefficient of thermal conductivity, can be used for preparing high-temperature-insulating bricks, heat-insulating plates, special-shaped pieces and coating materials and can be applied to the heat insulating protection of equipment such as high-temperature furnace hearths, pipelines and valves in the fields of aerospace and military industries, metallurgical forging, petroleum refining, electric power and the like, so that the safety of use and the level of energy saving and consumption lowering are improved.

Description

technical field [0001] The invention relates to a high-temperature heat-insulating material and a preparation method thereof, in particular to using thixotropic colloid as a template agent to form a uniform three-dimensional network nanoporous structure in water phase, and adding binders, aggregates, powders, opacifiers and admixtures , to prepare a high-temperature heat-insulating material with a nanoporous structure. The preparation method of the high-temperature heat insulation material of the present invention has the advantages of simple operation, no need for high-pressure special equipment, low production cost, no flammable, explosive or other harmful substances, and the process is green, environmentally friendly and safe, and is conducive to mass production. The high temperature heat insulation material involved in the present invention has the characteristics of light weight, high strength and low thermal conductivity, and can be prepared into high temperature heat in...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B28/26C04B28/06C04B28/34C04B14/30C04B14/04C04B14/10C04B16/02C04B16/04
Inventor 金承黎
Owner 浙江圣润纳米科技有限公司
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