Preparation method and application of bamboo fiber / cement radiation refrigeration composite material

By developing a method for preparing bamboo fiber/cement composite materials, the issues of preparation process, environmental friendliness, and performance compatibility of radiative cooling materials have been resolved. This method achieves a combination of efficient radiative cooling and excellent mechanical strength, making it suitable for diverse applications in construction and roads.

CN121990810APending Publication Date: 2026-05-08CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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Patent Information

Application Number
CN202610050484.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-15
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing radiation cooling materials face bottlenecks in preparation processes, environmental friendliness, and performance compatibility, making it difficult to meet the requirements for large-scale production and compatibility with cement-based materials. Furthermore, the mechanical properties of existing materials are insufficient to meet the requirements for use in buildings and roads.

Method used

By using bamboo fiber/cement composite materials, bamboo fibers are oriented and combined with magnesium oxychloride cement, and nano-titanium dioxide and polyvinyl alcohol modifiers are added to prepare a composite cement material that combines efficient radiative cooling performance with excellent mechanical strength.

Benefits of technology

It achieves high-efficiency radiative cooling performance, with a solar reflectivity of 99.9%, an infrared emissivity of 90%, a bending strength of 176±18MPa, and a compressive strength of ≥200MPa. It is green and environmentally friendly, low in cost, and suitable for diverse applications such as building exterior walls, roofs, and roads.

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Abstract

The invention discloses a preparation method and application of a bamboo fiber / cement radiation refrigeration composite material, and the preparation method comprises the following steps: cutting moso bamboo chips into preset sizes, and sequentially carrying out acid cooking delignification, alkali liquor soaking modification and air drying treatment to obtain high-purity bamboo fibers; weighing light magnesium oxide, magnesium chloride and deionized water, and mixing and stirring to obtain a cement-based solution; adding polyvinyl alcohol (PVA) and nano titanium dioxide (TiO2) into the cement-based liquid, ultrasonically dispersing and mechanically stirring uniformly to obtain radiation refrigeration cement slurry; the bamboo fibers pretreated in the step S1 are directionally arranged in a mold, the radiation refrigeration cement slurry prepared in the step S2 is poured and placed in a constant-temperature and constant-humidity box to be cured, demolding is conducted after hydration reaction is completed, and the radiation refrigeration cement is obtained. According to the invention, the bamboo fiber reinforced magnesium oxychloride cement is used as a matrix, and the nano refrigeration particles are compounded, so that the balance of the material among efficient radiation refrigeration performance, high mechanical strength and environmental protection is realized, and the passive cooling requirement of a building structure is met.
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