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Expandable alumina-based fiber module and preparation method thereof

A technology based on alumina fiber and alumina, which is applied to ceramic products, clay products, and other household appliances. Shrinkage problems, the effect of avoiding shrinkage seams

Active Publication Date: 2021-04-16
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the alumina fiber module is used as a lining material in a high-temperature furnace at 1400 ° C for a long time, it will shrink
Although the existing technology uses protective sheets to support and perform physical compression during processing and construction, the protective sheets will be removed during installation to expand and do caulking, but due to the high temperature in the furnace for a long time, shrinkage will still occur. A large number of shrinkage joints appear, resulting in defects in the thermal insulation of the furnace lining, which affects the heat preservation effect; when shrinkage joints appear, construction repairs are required, which wastes manpower and material resources; and it is troublesome to use protective sheets in the process of processing, construction and installation

Method used

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  • Expandable alumina-based fiber module and preparation method thereof

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[0043] The invention provides a method for preparing an expandable alumina-based fiber module, comprising the following steps:

[0044] a) mixing alumina fibers, water and a dispersant to obtain a fiber dispersion;

[0045] b) mixing the fiber dispersion with expandable powder, inorganic binder, alum solution and gelatinized starch liquid to obtain fiber slurry;

[0046] c) forming and drying the fiber slurry to obtain an expandable alumina-based fiber module;

[0047] The expandable powder is selected from one or more of organic expansion powder and inorganic expansion powder;

[0048] The organic expansion powder is dipentaerythritol and / or melamine;

[0049] The inorganic expansion powder is selected from one or more of expanded graphite, hydrated alkali metal silicate, vermiculite, perlite, volcanic glass and mica;

[0050] The inorganic binder is low-sodium silica sol.

[0051] In the present invention, the alumina fiber is firstly dispersed to form a fiber dispersion...

Embodiment 1

[0084] S1. Crush the alumina fibers and remove slag; obtain pretreated fibers with a fiber index of 71% and a fiber length of 250 μm.

[0085] S2. Add the pretreated fiber into clear water for dispersion, then add the dispersant polyamide epichlorohydrin resin and mix evenly to obtain a fiber dispersion. Wherein, the mass ratio of alumina fiber to water is 10%, and the mass ratio of dispersant to alumina fiber is 0.15%.

[0086] S3. Add expandable powder to the fiber dispersion and mix well.

[0087] The amount of the expandable powder accounts for 30% of the total mass of the alumina fiber and the expandable powder. Wherein, the organic expansion powder and the inorganic expansion powder are mixed by 50%:50%; the organic expansion powder is dipentaerythritol and melamine, and the mass ratio of the two is 2:1; the inorganic expansion powder is expansion vermiculite.

[0088] S4. Add low-sodium silica sol and alum solution to the system, and mix well.

[0089] Among them, th...

Embodiment 2

[0095] S1. Crush the alumina fibers and remove slag; obtain pretreated fibers with a fiber index of 71% and a fiber length of 250 μm.

[0096] S2. Add the pretreated fiber into clear water for dispersion, then add the dispersant polyamide epichlorohydrin resin and mix evenly to obtain a fiber dispersion. Wherein, the mass ratio of alumina fiber to water is 5%, and the mass ratio of dispersant to alumina fiber is 0.1%.

[0097] S3. Add expandable powder to the fiber dispersion and mix well.

[0098] The amount of the expandable powder accounts for 10% of the total mass of the alumina fiber and the expandable powder. Wherein, the organic expansion powder and the inorganic expansion powder are mixed according to 20%:80%; the organic expansion powder is dipentaerythritol and melamine, and the mass ratio of the two is 1:1; the inorganic expansion powder is expanded graphite.

[0099] S4. Add low-sodium silica sol and alum solution to the system, and mix well.

[0100] Among them...

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Abstract

The invention provides an expandable alumina-based fiber module and a preparation method thereof. The method comprises the following steps: dispersing alumina fibers to form a fiber dispersion liquid, and mixing the fiber dispersion liquid with a certain amount of expandable powder, an inorganic binder, an alum solution and a gelatinized starch solution to obtain a fiber slurry; and molding the slurry to obtain the expandable alumina-based fiber module. When the alumina-based fiber module prepared by the method is used as a furnace lining, the alumina-based fiber module has excellent thermal expansion capacity under a high-temperature condition, the problem of linear shrinkage can be effectively solved, shrinkage joints are avoided, and meanwhile, good strength can be maintained after high-temperature sintering.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to an expandable alumina-based fiber module and a preparation method thereof. Background technique [0002] Compared with other materials, alumina fiber has higher refractoriness. It can be widely used in the lining of high-temperature heating furnaces in the petrochemical industry, the columns and corners of ethylene cracking furnaces, the lining of reforming furnaces, and the lining of rapid firing kilns in the ceramic industry, etc. [0003] However, when the alumina fiber module is used as a lining material in a high-temperature furnace at 1400 ° C for a long time, it will shrink. Although the existing technology uses protective sheets to support and perform physical compression during processing and construction, the protective sheets will be removed during installation to expand and do caulking, but due to the high temperature in the furnace for a long time, shrink...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B38/00C04B35/66C04B33/36C04B33/13C04B35/536C04B35/18C04B35/16C04B35/00C04B35/622
Inventor 岳耀辉傅超鹿明李梅王成龙
Owner 山东鲁阳浩特高技术纤维有限公司
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