Anhydrite-polypropylene composite hollow plate and preparation method thereof

By modifying anhydrous gypsum powder and preparing highly filled masterbatch, the interfacial compatibility and dispersibility issues of anhydrous gypsum-polypropylene composites were solved, improving the mechanical and processing properties of hollow boards and realizing the preparation of high-performance composite materials.

CN121554876BActive Publication Date: 2026-06-30WUHAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610093964.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-23
Publication Date
2026-06-30
Estimated Expiration
2046-01-23

AI Technical Summary

Technical Problem

Existing technologies for anhydrous gypsum-polypropylene composites suffer from poor interfacial compatibility, poor dispersibility, deteriorated processing performance, and insufficient mechanical properties, making it difficult to meet the comprehensive mechanical performance requirements of components such as hollow boards.

Method used

By modifying anhydrous gypsum powder, introducing hydroxyl functional groups, and using long-chain fatty acids and coupling agents to form a composite surface modifier, combined with compatibilizers, lubricants, and antioxidants, a high-filling-function masterbatch is prepared. A two-step extrusion molding process is then used to improve interfacial bonding and dispersibility.

Benefits of technology

The mechanical and processing properties of the composite material were significantly improved, and anhydrous gypsum-polypropylene hollow boards with high rigidity, high strength, low cost and environmental protection were prepared, meeting the application requirements of hollow boards.

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Abstract

This invention provides anhydrous gypsum-polypropylene composite hollow board and its preparation method. The anhydrous gypsum-polypropylene composite hollow board comprises the following components by weight percentage: 30%-65% modified anhydrous gypsum powder, 30%-65% polypropylene resin, 1%-3% compatibilizer, 1%-3% lubricant, and 0.1%-0.3% antioxidant. The modified anhydrous gypsum powder is prepared by modifying hydroxylated anhydrous gypsum powder with a composite surface modifier formed by compounding long-chain fatty acids or their derivatives with a coupling agent. The anhydrous gypsum-polypropylene composite hollow board is prepared by a two-step method: first, a high-filler functional masterbatch is prepared, and then the hollow board is extruded. By modifying the anhydrous gypsum powder and combining it with the two-step preparation method, the problems of weak interfacial bonding between anhydrous gypsum and the polypropylene matrix and poor dispersibility with high filler content are solved, thus systematically improving the mechanical properties and processing performance of the composite hollow board.
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