Preparation method of hollow fiber membrane composite thermal insulation material

Hollow fiber membrane composites were prepared by dry/wet spinning and hot pressing techniques, which solved the problem of poor reprocessing performance of reinforced hollow fiber membranes in the field of thermal insulation. This achieved efficient thermal insulation and broadband sound absorption, expanding its application in thermal insulation and sound absorption materials.

CN117306110BActive Publication Date: 2026-01-27ANHUI POLYTECHNIC UNIV +2
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Patent Information

Application Number
CN202311424393.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-31
Publication Date
2026-01-27
Estimated Expiration
2043-10-31

AI Technical Summary

Technical Problem

The practical application of reinforced hollow fiber membranes in the field of thermal insulation is limited, mainly because their large fiber diameter leads to poor reprocessing performance, making it difficult to prepare them into effective thermal insulation materials.

Method used

Using polyurethane as the polymer material, hollow fiber membrane composite thermal insulation material is prepared through dry/wet spinning technology and hot pressing. Reinforced polyurethane hollow fiber membrane assemblies are formed by non-solvent-induced phase separation and concentric circle composite spinning technology, and then hot-pressed under specific temperature and pressure.

Benefits of technology

The prepared hollow fiber membrane composite material has excellent thermal insulation and air permeability, as well as good low-frequency broadband sound absorption performance. It breaks through the bottleneck of poor low-frequency noise absorption effect of traditional porous sound-absorbing materials and has academic and practical application value.

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Abstract

The application relates to a preparation method of a hollow fiber membrane composite thermal insulation material, which comprises the following steps: adding 18-22% of polyurethane, 4-8% of polyethylene glycol 2000 and 72-76% of N,N-dimethylacetamide into a spinning reaction kettle to mix, stir and defoam to prepare homogeneous casting solution; based on a non-solvent induced phase separation method, the homogeneous casting solution is coated on the surface of a polyester braided tube through a spinneret by adopting a concentric circle composite spinning technology, is gathered on a spinning wheel after a coagulation bath to form a reinforced polyurethane hollow fiber membrane assembly which is arranged in parallel and obliquely crosses and is mutually bonded, and the fiber membrane assembly is hot-pressed to prepare the hollow fiber membrane composite thermal insulation material under the conditions of a temperature of 60-150 DEG C and a pressure of 120-470 MPa. Since the coating layer and the braided tube are both through porous structures, the prepared composite material has good air permeability.
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