Modified fiber, preparation method and application thereof, and cement-based material

By alkali treatment and crystallization agent treatment of natural sisal fibers, fibers with crystallization coating on the surface are formed, which solves the problem of poor applicability of natural fibers in cement-based environments, and improves its binding ability with cement-based materials and the mechanical properties of the mortar.

CN119707340APending Publication Date: 2025-03-28SHENZHEN UNIV
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Patent Information

Application Number
CN202411888518.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Natural fibers have poor applicability in cement-based environments, mainly due to their susceptibility to corrosion, insufficient fiber resistance, dispersed mechanical properties and weak bonding with the substrate.

Method used

By alkali treatment and crystallizer treatment of natural sisal fibers, fibers with crystallization coatings on the surface are formed, thereby improving their adaptability in the cement-based material and their interfacial bonding ability with the cement-based material.

Benefits of technology

The interface combination and pull-out shear force between natural fibers and cement-based materials is improved, the mechanical properties of mortar is enhanced, the service life of natural fibers is extended, and the mechanical properties of cement-based materials are improved under a certain amount of natural fibers are added.

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Abstract

The invention provides a preparation method of modified fibers, and belongs to the technical field of fiber preparation. The method comprises the following steps: (1) carrying out alkali treatment on natural fibers to obtain alkali-treated fibers; (2) treating the alkali-treated fibers obtained in the step (1) with a crystallizing agent to obtain alkali-treated fibers with crystal coatings on the surfaces; wherein in the step (1), the concentration of alkali liquor in alkali treatment is 5%, and the alkali treatment time is not longer than 24 h. The natural sisal fibers are subjected to alkali treatment and crystallizing agent treatment, so that the adaptability of the natural fibers in the cement-based material is improved, the interface bonding and pull-out shear force of the natural fibers and the cement-based material are improved, and the mechanical property of the mortar is improved.
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