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Lower thermal conductivity heat-barrier material and method for making same

A technology of thermal insulation material and slurry, which is applied to heat exchange equipment, protected pipelines through thermal insulation, mechanical equipment, etc., can solve the problems of low thermal conductivity, inability to meet the requirements of special equipment, and high thermal conductivity of composite thermal insulation materials , to achieve the effect of low thermal conductivity

Inactive Publication Date: 2009-09-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Potassium hexatitanate whiskers have low thermal conductivity, but the material is a powdery substance, which is difficult to be directly used in thermal insulation occasions
However, the thermal conductivity of the above-mentioned composite insulation materials is still high, which cannot meet the requirements of some special equipment under severe conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The components of the heat insulating material are as follows, all in parts by weight:

[0019] 50 parts of basalt fiber, 20 parts of potassium hexatitanate whiskers, binder: 10 parts of starch and 1 part of polyvinyl alcohol, 6 parts of additives composed of polyaluminum chloride and amide in a weight ratio of 1:1.

[0020] The preparation method is as follows:

[0021] Add 50 parts of basalt fiber to 200 parts of water and stir to form a slurry. Subsequently, 20 parts of potassium hexatitanate whiskers were added, and while stirring, 10 parts of starch, 1 part of polyvinyl alcohol, 3 parts of polyaluminum chloride, and 3 parts of amide were successively added. When the liquid in the slurry changes from turbid to clear, the flocs are copied out, molded, and dried at 70°C to obtain a basalt fiber / potassium hexatitanate whisker composite heat insulation board.

[0022] The thermal conductivity of the composite heat insulation board is 0.030W / (m·K) at 200°...

Embodiment 2

[0023] Embodiment 2: As described in Embodiment 1, the difference is that the components are as follows, all in parts by weight:

[0024] 60 parts of basalt fiber, 30 parts of potassium hexatitanate whisker, 8 parts of silica sol, 8 parts of starch, 2 parts of polyvinyl alcohol, 4 parts of polyaluminum chloride, and 3 parts of amide.

[0025] The preparation method is the same as in Example 1, and the silica sol is added to the slurry before the starch and polyvinyl alcohol are added. The obtained composite heat insulation board has relatively high strength, the thermal conductivity at 200°C is 0.036W / (m·K), and the thermal conductivity at 800°C is 0.054W / (m.K).

Embodiment 3

[0026] Embodiment 3: As described in Embodiment 1, the difference is that the components are as follows, all in parts by weight:

[0027] 40 parts of basalt fiber, 10 parts of potassium hexatitanate whisker, 12 parts of starch, 5 parts of polyaluminum chloride, and 3 parts of amide. The thermal conductivity of the obtained composite heat insulating material is 0.033W / (m·K) at 200°C, and 0.052W / (m.K) at 800°C.

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PUM

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Abstract

The invention relates to a composite thermal insulation material with low thermal conductivity and a preparation method thereof, belonging to the technical field of thermal insulation materials. The composite heat insulating material is composed of 45-65 parts of basalt fiber, 10-35 parts of potassium hexatitanate whisker, 5-20 parts of binder, and 2-8 parts of auxiliary agent, all by weight. The preparation method includes: adding basalt fiber into water and stirring to form a slurry, adding potassium hexatitanate whiskers, binders and auxiliary agents, copying out the floc, molding and drying to obtain the product. The thermal insulation material of the present invention has the characteristics of low thermal conductivity, the thermal conductivity at 200-800°C is 0.030-0.054W / (m·K), and can be used at temperatures below 1000°C.

Description

technical field [0001] The invention relates to a low thermal conductivity basalt fiber / potassium hexatitanate whisker composite high-temperature heat insulation material and a preparation method thereof, belonging to the technical field of heat insulation materials. Background technique [0002] Inorganic fibrous materials have the outstanding characteristics of low density, high heat capacity, low thermal conductivity and high temperature resistance, and are widely used in chemical industry, metallurgy, building materials, national defense and other fields. At present, the inorganic fiber insulation materials used below 1200℃ are mainly aluminum silicate fiber, basalt fiber, glass fiber, rock wool, etc., including fiber cotton, fiber felt, fiber blanket, fiber paper, fiber rope and other products. This type of material has stable high temperature thermal insulation performance and chemical attack resistance during use. However, the thermal conductivity of a single inorgan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L59/02
Inventor 张玉军龚红宇谭砂砾聂丽芳魏红康赵林赵东亮
Owner SHANDONG UNIV
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