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Preparation method and application of porous foam material based on biomass nano material

A technology for porous foam materials and nanomaterials, which is applied in the field of preparation of porous foam materials, can solve the problems of difficult large-scale production and industrial application, high equipment requirements and high production costs, and achieves low equipment requirements, improved mechanical properties, and improved production. low cost effect

Pending Publication Date: 2019-12-24
浙江跃维新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although freeze-drying and supercritical drying can prepare porous foam materials with excellent properties, these two methods often require relatively high drying conditions, such as low temperature and low pressure or high temperature and high pressure; high equipment requirements, high energy consumption, and severe limitations in production capacity; As a result, the production cost is very high, and it is difficult to scale production and industrial application

Method used

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  • Preparation method and application of porous foam material based on biomass nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of nanocellulose fiber (NFC) / polyethyleneimine (PEI) / polyethylene glycol diglycidyl ether (PEGDGE) porous foam material.

[0036] Mix and stir NFC, PEI, PEGDGE, water, and ethanol evenly. The concentration of NFC in the mixed dispersion liquid is 3%; the concentration of PEI is 0.5%; the concentration of PEGDGE is 2.5%, ethanol is 5%, and the balance is water. Pour the mixed dispersion into a stainless steel container and freeze at -20°C. After standing at -20°C for 12 hours, the frozen gel was thawed at room temperature to obtain a gel, which was then dried in a vacuum oven at 100°C to obtain a sheet-like foam material. The density is 0.10g / cm -3 , porosity>90%, thermal conductivity around 50℃: 0.029W / mK.

Embodiment 2

[0037] Example 2: Preparation of bulk chitin nanofiber (CHNF) / pentaethylene hexamine (PEHA) / ethylene glycol diglycidyl ether (EGDGE) porous foam material.

[0038] Mix CHNF, PEHA, EGDGE and water and stir evenly. The concentration of CHNF in the mixed dispersion liquid is 1%; the concentration of PEHA is 0.2%; the concentration of EGDGE is 1%. The mixed solution was then frozen at -20°C. After standing for 48 hours, the frozen gel was thawed at room temperature to obtain a cross-linked block gel, which was then dried in an oven at 100°C to obtain a block-shaped foam material. The material has a high water absorption rate and can absorb more than 25 times its own weight in water.

Embodiment 3

[0039] Example 3: Preparation of porous foam material of film-like microfibrillated cellulose (MFC) / polyethyleneimine (PEI) / epichlorohydrin.

[0040] Mix MFC, PEI, epichlorohydrin, and water and stir evenly. In the mixed dispersion liquid, the MFC concentration is 1.5%, the PEI concentration is 1%, the epichlorohydrin concentration is 3%, and the balance is water. Pour the mixed solution into a stainless-steel baking pan and freeze in a -20°C environment. After standing for 12 hours, the frozen gel was thawed at room temperature to obtain a gel, and then the gel was dried under normal pressure at 100°C to obtain a film-like foam material with a thickness of 1.5mm and a thermal conductivity of 0.029W / mK, the film has good flexibility.

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Abstract

The invention discloses a preparation method and application of a porous foam material based on a biomass nano material. The preparation method specifically comprises the following steps: 1) mixing the biomass nano material with an organic amine, a cross-linking agent, a solvent and a filler to form a dispersion liquid; 2) freezing the dispersion liquid at a low temperature; carrying out cross-linking reaction on the organic amine and a cross-linking agent under a freezing condition to form cross-linked ice gel; and 3) drying the ice gel to obtain the solid porous material. The organic amine comprises one or a mixture of more of amine-containing polymer and polyamine, and the porous foam material has low thermal conductivity and good flexibility, and can be used for heat insulation and preservation, buffer materials, pollution adsorption materials and the like.

Description

technical field [0001] The present invention relates to a kind of preparation method of porous foam material, especially a kind of preparation method and application of the porous foam material based on biomass nano material. Background technique [0002] Polysaccharide biomass materials, such as cellulose, chitin, starch, etc., are the most common natural polymer materials with the largest output in nature. Polysaccharides are renewable and degradable, green and environmentally friendly, and have increasingly become new materials that people pay attention to. Polysaccharide porous foam materials (also known as aerogels and sponges) have the characteristics of low density, high porosity, large specific surface area, and good biocompatibility (Soft Matter, 2011, 7, 10360; J. Mater.Chem., 2012,22,5801; Chemical Progress 26, no.05(2014):796-809;), can be widely used in gas adsorption, liquid absorption, oil-water separation, adsorption of pollutants such as dyes and heavy meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08L79/02C08L71/02C08L5/08C08L97/02C08K5/17C08K5/1515C08K3/22C08K3/36C08J9/28C08J3/24
CPCC08J3/24C08J3/246C08J9/0023C08J9/0028C08J9/0061C08J9/0071C08J9/0095C08J9/28C08J2301/04C08J2305/08C08J2397/02C08J2471/02C08J2479/02C08K3/36C08K5/1515C08K5/17C08K2003/2275C08K2201/011
Inventor 李银勇蔡建锋
Owner 浙江跃维新材料科技有限公司
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