Heat-resistant degradable porous cooling membrane material as well as preparation method and application thereof

By using a bimodal porous structure formed by PLLA/PDLA blends and nano-protruding calcium carbonate particles, the problems of insufficient degradability and heat resistance of polylactic acid radiation cooling materials are solved, and a high-efficiency and environmentally friendly porous cooling membrane material is prepared, which is suitable for a variety of outdoor applications.

CN121718142AActive Publication Date: 2026-03-24XIAMEN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-25
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Existing polylactic acid radiation cooling materials suffer from poor biodegradability, insufficient heat resistance, complex and environmentally unfriendly manufacturing processes, and difficulty in long-term use in humid outdoor environments.

Method used

A blend of PLLA and PDLA was used as the matrix, and spherical calcium carbonate particles with nano-protrusions on the surface were combined to form a bimodal porous structure. The calcium carbonate template was removed by acid washing to prepare a porous membrane material with high reflectivity and high emissivity. The use of volatile organic solvents was avoided, and a melt processing technology was adopted.

Benefits of technology

This porous membrane material achieves efficient reflection of solar and infrared radiation, possesses good hydrophobicity and heat resistance, is easy to industrialize, has excellent degradation performance, and is suitable for a variety of outdoor applications.

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Abstract

The invention discloses a heat-resistant degradable porous cooling membrane material as well as a preparation method and application thereof, and belongs to the technical field of radiation refrigeration materials. The membrane material takes a blend of poly (L-lactic acid) and poly (D-lactic acid) as a matrix, and stereocomplex crystals are formed in the matrix to improve heat resistance; the interior of the membrane material is provided with a bimodal pore structure which is formed after the spherical calcium carbonate template with the protrusions on the surface is removed through acid pickling, the structure is composed of large pores with the size being 1-13 micrometers and small pores with the size being 0.1-0.8 micrometer and distributed on the inner wall of the large pores, and the porosity is 55-70%. By means of the structure, the film material can achieve the excellent radiation refrigeration effect that the solar reflectivity and the atmospheric window emissivity are both larger than 0.9 under the condition that a metal coating is not needed, and good hydrophobicity is achieved. The preparation method is simple, environment-friendly, easy to industrialize and low in cost. The film material can be widely applied to the field of outdoor passive cooling such as car clothing and building films.
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