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Preparation method of nano cellulose/chitosan composite foam

A nano-cellulose and composite foam technology, applied in the field of cellulose composite materials, can solve the problems of brittle texture, low thermal stability, poor biocompatibility, etc., and achieve large porosity, small thermal conductivity and thermal expansion coefficient, high The effect of specific surface area

Active Publication Date: 2015-04-29
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a nanocellulose / chitosan composite foam in order to solve the problems of poor biocompatibility, brittle texture and low thermal stability of chitosan composite materials such as traditional foams and aerogels. Preparation

Method used

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  • Preparation method of nano cellulose/chitosan composite foam
  • Preparation method of nano cellulose/chitosan composite foam

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specific Embodiment approach 1

[0019] Specific embodiment one: the preparation method of nanocellulose / chitosan composite foam of the present embodiment is implemented according to the following steps:

[0020] 1. Carrying out chemical treatment on biomass raw materials containing cellulose to obtain purified cellulose, and then performing mechanical defibrillation treatment on the purified cellulose to prepare nanocellulose aqueous suspension;

[0021] Two, glacial acetic acid and distilled water are mixed, obtain glacial acetic acid solution, then add chitosan, magnetically stir evenly, obtain chitosan mixed solution;

[0022] 3. The nanocellulose aqueous suspension obtained in step one is mixed with the chitosan mixed solution obtained in step two, and the nanocellulose / chitosan composite solution is obtained after stirring;

[0023] 4. Carry out low-temperature freezing treatment to the nanocellulose / chitosan composite solution at -20° C. to obtain a frozen mixed solution;

[0024] 5. Drying the frozen...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the cellulose-containing biomass raw material in step 1 is wood, bamboo, cotton, hemp, bacterial cellulose or ascidian cellulose. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the chemical treatment in step 1 is sequentially treated with sodium chlorite solution and alkali solution. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a preparation method of nano cellulose / chitosan composite foam, relates to the field of cellulose composite materials, and aims at solving the problems of poor biocompatibility of traditional materials such as foam and aerogel and low thermostability of a chitosan composite material. The preparation method of the composite foam comprises the following steps: 1 carrying out chemical treatment and mechanical fiber degradation treatment on a biomass material containing cellulose to prepare a nano cellulose turbid liquid; 2 adding chitosan to an acetic acid glacial solution to prepare a chitosan mixed liquid; 3 mixing the nano cellulose turbid liquid with the chitosan mixed liquid to obtain a nano cellulose / chitosan composite liquid; 4 carrying out low-temperature freezing treatment on the composite liquid; and 5 carrying out drying treatment on the frozen mixed liquid to obtain the nano cellulose / chitosan composite foam. The used raw materials are natural high polymer materials, so that the nano cellulose / chitosan composite foam is good in biocompatibility, low in thermal volume shrinkage rate and good in heat stability.

Description

technical field [0001] The invention relates to the field of cellulose composite materials, in particular to a preparation method of nanocellulose / chitosan composite foam. Background technique [0002] At present, commonly used foam materials mainly include benzene board (EPS), polyurethane foam, pearl cotton, etc. Foam materials are widely used in thermal insulation materials, sound insulation materials, packaging materials, Vehicle and ship hulls and other fields. Although these foam materials have many advantages, due to the problems of non-renewable raw materials, poor biocompatibility and non-degradability, the existing foam materials are more or less harmful to the natural environment during the manufacturing and application process or after being discarded. The impact of the material, which in turn limits the application of the material in some fields. Cellulose and chitosan are the world's first and second largest natural renewable resources respectively. They are ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L1/02C08L5/08
Inventor 陈文帅王宇舒于海鹏张奇刘一星
Owner NORTHEAST FORESTRY UNIVERSITY
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