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A kind of composite foam with hierarchical porous structure and its preparation method and use

A graded porous and composite foam technology, which is applied in the direction of instruments and sound-generating devices, can solve the problems that the sound absorption performance of melamine foam does not fully meet the actual needs, and achieve the effect of improving the low-frequency sound absorption effect and improving the sound absorption performance

Active Publication Date: 2021-10-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sound absorption performance of melamine foam has not yet fully met the actual needs, especially the low-frequency sound absorption still needs to be further improved, and it is of great significance to find a sound-absorbing material with better sound absorption performance

Method used

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  • A kind of composite foam with hierarchical porous structure and its preparation method and use
  • A kind of composite foam with hierarchical porous structure and its preparation method and use
  • A kind of composite foam with hierarchical porous structure and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1, the preparation of the composite foam with hierarchical porous structure of the present invention

[0056] Put 3.906g nanocellulose aqueous solution (CNF solution, the nanocellulose content is 0.512wt% in the nanocellulose aqueous solution used) and 16.094g deionized water in the beaker of 30mL and stir, obtain the CNF concentration of 0.1wt % of the mixture. The MF foam was cut into cylinders with a diameter of 29 mm and a thickness of 2 cm with a router. Put the MF foam into the mixture, press it three times with a long glass stopper to obtain the mixture, then place the obtained mixture in a water bath ultrasonic machine for 1 hour of ultrasonication; the samples obtained after ultrasonication undergo 4 cycles of freezing, which are stored at -20°C Freeze for 15h, then take out the sample and place it at room temperature to thaw for 9h as a cycle, then freeze the obtained mixture for 10min with liquid nitrogen, then place it in a freeze dryer for 72h, ...

Embodiment 2

[0062] Embodiment 2, the preparation of the composite foam with hierarchical porous structure of the present invention

[0063] Put 0.420g polyvinyl alcohol aqueous solution (PVA solution, PVA content is 4.762wt% in the PVA solution used) and 19.580g deionized water in the beaker of 30mL and stir evenly, obtain the mixed solution that PVA concentration is 0.1wt% . The MF foam was cut into cylinders with a diameter of 29 mm and a thickness of 2 cm with a router. Put the MF foam into the mixture, press it three times with a long glass stopper to obtain the mixture, then place the obtained mixture in a water bath ultrasonic machine for 1 hour of ultrasonication; the samples obtained after ultrasonication undergo 4 cycles of freezing, which are stored at -20°C Freeze for 15h, then take out the sample and place it at room temperature to thaw for 9h as a cycle, then freeze the obtained mixture for 10min with liquid nitrogen, then place it in a freeze dryer for 72h, to obtain the me...

Embodiment 3

[0067] Embodiment 3, the preparation of the composite foam with hierarchical porous structure of the present invention

[0068] Put 0.4g water-soluble polyurethane aqueous solution (WPU solution, WPU content is 50wt% in the WPU solution used) and 19.6g deionized water in the beaker of 30mL and stir evenly, obtain the mixed solution that WPU concentration is 1wt%. The MF foam was cut into cylinders with a diameter of 29 mm and a thickness of 2 cm with a router. Put the MF foam into the mixture, press it three times with a long glass stopper to obtain the mixture, then place the obtained mixture in a water bath ultrasonic machine for 1 hour of ultrasonication; the samples obtained after ultrasonication undergo 4 cycles of freezing, which are stored at -20°C Freeze for 15h, then take out the sample and place it at room temperature to thaw for 9h as a cycle, then freeze the obtained mixture for 10min with liquid nitrogen, then place it in a freeze dryer for 72h, to obtain the mela...

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Abstract

The invention provides a composite foam with hierarchical porous structure and its preparation method and application, belonging to the field of functional materials. The preparation method of the complex foam comprises the following steps: soaking the melamine foam in the polymer solution, ultrasonication, cyclic freezing, and drying to obtain the composite foam; the polymer is a polymer capable of forming hydrogen bonds between molecules. The present invention utilizes the cyclic freezing method to prepare the melamine composite foam with a porous structure. The porous structure has the characteristics of interconnection, different pore sizes, and contains many small-sized holes, forming a hierarchical porous structure, which can significantly improve the performance of the melamine foam. Excellent sound-absorbing performance, especially greatly improving the low-frequency sound-absorbing effect. The composite foam of the invention can be used as a sound-absorbing material, and can be used in the prevention and control of noise pollution, the absorption and shielding of radio waves, radar, microwaves, etc., sonar stealth, underwater communication and other fields, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a composite foam with hierarchical porous structure and its preparation method and application. Background technique [0002] With the development of science and technology and modern industry, noise pollution has become a worldwide problem. At the same time, with the enhancement of environmental awareness, people's requirements for the sound environment are getting higher and higher. Noise has become a major public hazard that pollutes the human social environment. Noise pollution will cause harm to people, animals, instruments and buildings, such as damage to equipment and building structures, or damage people's hearing, cause deafness, or induce tinnitus, insomnia, general fatigue, indigestion and other diseases . Noise pollution seriously affects people's work and life. Sound absorption and noise reduction has gradually evolved into an important issue that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42C08L61/28C08L1/04C08L29/04C08L75/04G10K11/162
CPCC08J9/42C08J2361/28C08J2401/04C08J2429/04C08J2475/04G10K11/162
Inventor 邹华维沈璐梁梅张浩若陈洋
Owner SICHUAN UNIV
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