Lightweight self-flowing thermal insulation castable based on modified aggregate and preparation method thereof

By modifying expanded perlite, mullite hollow spheres, and hollow glass microspheres, and combining them with water-reducing agents, the problems of floating and fluidity of lightweight thermal insulation castables during casting were solved, achieving efficient casting uniformity and excellent thermal insulation performance.

CN122167179APending Publication Date: 2026-06-09ZHENGZHOU RONGSHENG NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202610461141.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Conventional lightweight insulating castables tend to have lightweight aggregates that float during casting, resulting in poor fluidity, incomplete casting, and segregation, making it difficult to meet the insulation layer requirements of industrial kilns.

Method used

Lightweight self-flowing thermal insulation castable was prepared by using modified expanded perlite, mullite hollow sphere aggregate, and hollow glass microsphere aggregate, modified with polyethylene glycol and polyvinylpyrrolidone, combined with wood pulp cellulose and aluminum sol treatment to increase the hydrophilicity and flowability of the aggregate, and using water-reducing agents to improve flowability.

Benefits of technology

It enables the formation of a porous structure in lightweight aggregates at high temperatures, improves casting uniformity and thermal insulation performance, avoids vibration casting, and enhances the self-flowability and thermal insulation effect of the castable.

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Abstract

The invention relates to a light self-flow heat-preservation castable based on modified aggregate. The light self-flow heat-preservation castable is prepared from the following raw materials in parts by mass: 40 to 50 parts of modified expanded perlite, 8 to 12 parts of mullite hollow sphere aggregate, 5 to 10 parts of hollow glass bead aggregate, 6 to 10 parts of kyanite powder, 4 to 5 parts of pyrophyllite, 5 to 8 parts of silica powder, 20 to 30 parts of high-alumina cement, 0.9 to 1.5 parts of explosion-proof fiber, 0.001 to 0.002 part of cellulose ether and 0.4 to 0.5 part of water reducing agent. The light self-flowing heat-preservation castable based on the modified aggregate is high in self-flowing value, good in fluidity, low in volume density and good in heat preservation and heat insulation performance.
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