Anti-crack easy-to-demould non-adhesion fiber cement board and preparation method thereof

By optimizing the raw material ratio and preparation process of fiber cement board, the problems of low demolding efficiency, adhesion and cracking in fiber cement board production have been solved. High-strength, low moisture expansion rate, crack-resistant, easy-to-demold and non-adhesive fiber cement board has been prepared, improving production line efficiency and product quality.

CN121850497APending Publication Date: 2026-04-14WUHAN BUILDING MATERIAL IND DESIGN & RES INST
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Patent Information

Application Number
CN202511839378.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

The existing fiber cement board production process suffers from problems such as low demolding efficiency, board adhesion leading to low stacking efficiency, and easy cracking of boards, which affect production line capacity and product quality.

Method used

Using a specific ratio of calcareous materials, siliceous materials, bentonite, mica powder, wollastonite, microfibers, HPMC, and pulp, and through a flow casting process and autoclaving, crack-resistant, easy-to-demold, and non-adhesive fiber cement boards are prepared. The particle size distribution and material synergy are optimized to improve strength and weather resistance.

Benefits of technology

It achieves high strength, low moisture expansion rate, good crack resistance, non-sticking during demolding, smooth production rhythm, and high product qualification rate. It is suitable for use in exterior wall panels under extreme climates and has good market competitiveness.

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Abstract

The invention provides an anti-crack easy-to-demould non-adhesion fiber cement board, which is prepared from the following raw materials: a calcium material, a siliceous material, bentonite, mica powder, wollastonite, microfibrillated fiber, HPMC and paper pulp, the calcium material is cement, the siliceous material comprises quartz sand, quartz powder and silica fume, and the mass ratio of the calcium material to the siliceous material is 0.9-1.0. In addition, the invention also provides a preparation method of the anti-crack easy-to-demould non-adhesion fiber cement board. The anti-cracking easy-to-demould non-adhesion fiber cement board is low in curing temperature, short in curing time, energy-saving, green and environment-friendly, relatively low in comprehensive cost, relatively high in density, non-sticky in demould, non-adhesion and crack-free after being discharged from a kettle, good in stability and excellent in performance in a freezing and thawing cycle weather resistance experiment, solves the difficult problems of board sticking, adhesion and the like of a production line, and has a good application prospect. The productivity of a production line is brought into full play, the product percent of pass of the production line is improved, and the manufactured plates can meet the use requirements of external wall panels in extreme climate areas.
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