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Preparation method and product of cellulose foam material with controllable form and density

A foam material, degrading cellulose technology, applied in the field of fully degradable polymer materials, can solve the problems of polluting the environment, high price, difficult recycling, etc., and achieve the effects of low cost, alleviation of dependence, and widening of the scope of application

Inactive Publication Date: 2013-12-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, solvents for dissolving cellulose include cuproammonia solutions (such as Cu(NH 3 ) 4 C(OH) 2 Complex) (Liu Renqing. Basis of Cellulose Chemistry [M]. Beijing: Science Press, 1985: 160), amine oxide system (N-methylmorpholine-N-oxide) (Rosenau T.et al. Prog.Polym.Sci.2001, 26:1763-1837), sodium hydroxide / water (NaOH / H 2 O) system (Roy C. et al. Biomacromolecules.2001, 2 (03), 687-693), lithium chloride / dimethylacetamide (LiCl / DMAc) system (Ishii D. et al. Biomacromolecules.2003, 4(05), 1238-1243), ionic liquids (such as [BMIM]Cl, [AMIM]Cl) (Zhang H.et al.Macromolecules.2005, 38(20), 8272-8277), etc., but these solvents exist Poor stability, environmental pollution, difficult recycling, expensive and other disadvantages

Method used

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  • Preparation method and product of cellulose foam material with controllable form and density
  • Preparation method and product of cellulose foam material with controllable form and density
  • Preparation method and product of cellulose foam material with controllable form and density

Examples

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Embodiment 1～18

[0025] (1) Prepare cellulose solution: prepare 400g of sodium hydroxide / urea aqueous solution, wherein the weight fraction of sodium hydroxide and urea are respectively 7%, 12%, place in the low temperature test chamber and precool to-12 ℃, immediately Add an appropriate amount of cellulose, stir ultrasonically for 1 hour, and dissolve the cellulose to obtain uniform cellulose solutions with weight fractions of 1%, 3%, and 5%, respectively;

[0026] (2) Preparation of cellulose hydrogel: the obtained cellulose solution was placed in a mold and treated in an oven at 70° C. for 24 hours. After the cellulose solution is gelled, soak it in distilled water until the pH of the system is 7;

[0027] (3) Preparation of cellulose foam products: the neutral cellulose hydrogel was dried in a vacuum oven at 50°C for 2h, 4h, 6h, 8h, and 10h respectively, and then it was quickly frozen at low temperature in liquid nitrogen, Then place it in a freeze dryer at -50°C and dry it for 2 days to ...

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Abstract

The invention discloses a preparation method of cellulose foam material with controllable form and density. In the preparation method, cellulose powder, sodium hydroxide and urea are used as the main raw materials; the form and the performance of the cellulose foam material are regulated and controlled by controlling the formation conditions to obtain a series of cellulose foam materials of which the density is 0.129 to 0.387g / cm<-3>, and the average bore diameter is 78 to 3600nm, so that the applied range of cellulosic material is easy to broaden. According to the invention, the product is environment-friendly, and the method of adjusting the form and the density is simple and effective.

Description

technical field [0001] The invention relates to the technical field of fully degradable polymer materials, in particular to the regulation and control of the microscopic appearance and macroscopic performance of foam materials by changing the molding conditions of products. Background technique [0002] Polymer foam is a porous polymer material with a large number of cell structures, based on a polymer material. The global demand for polymer foam is expected to reach 18 million tons by 2015, and it has become an indispensable and important polymer material in the national economy and daily life. Polymer foam materials have common characteristics such as light weight, low thermal conductivity, good heat insulation performance, excellent impact resistance, good cushioning and sound insulation performance, and high specific strength. They are widely used in metal electrodes, adsorption materials, structural materials, energy absorption materials and other fields. There are a w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L1/02
Inventor 李忠明刘春燕钟淦基
Owner SICHUAN UNIV