Cellulose nano-fibril/epoxy resin composite film preparation method

An epoxy resin and nanofibril technology, applied in the field of composite materials, can solve the problems of difficulty in meeting, low impact strength, easy cracking, etc., and achieve the effect of uniform fiber diameter distribution and good thermal stability

Inactive Publication Date: 2013-11-20
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the high cross-linking structure of pure epoxy resin, it is brittle, has low impact strength, and is easy to

Method used

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  • Cellulose nano-fibril/epoxy resin composite film preparation method
  • Cellulose nano-fibril/epoxy resin composite film preparation method
  • Cellulose nano-fibril/epoxy resin composite film preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1, such as figure 1 ,

[0029] Preparation of cellulose nanofibrils / epoxy resin composite film,

[0030] Purification of raw materials: screen poplar wood powder with a 60-70 mesh sieve, then perform benzene alcohol extraction (v / v=2:1) ​​to remove oil and other wood powder impurities in the wood powder, and wash the wood with absolute ethanol after extraction powder, remove the excess toluene in the wood powder, then place the washed wood powder in a petri dish, ventilate in the fume hood for 24~48h, wait for the wood powder to dry, take an appropriate amount of wood powder for the preparation of cellulose nanofibrils chemical treatment.

[0031] Chemical treatment:

[0032]The first acid treatment: Dissolve 10g of wood powder in 390ml of distilled water, add 3.9g of sodium chlorite to make a sodium chlorite solution with a concentration of 1%, and at the same time, add 3~4ml of acetic acid to ensure that the wood powder solution At this time, the pH value...

Embodiment 2

[0051] Changes in the appearance of wood fiber solution during chemical acid-base treatment:

[0052] Wood fiber contains cellulose, hemicellulose and lignin. The cellulose content in wood is about 40%~50%. There is hemicellulose around the original fine fiber, and there is lignin around the cellulose. , thus, cellulose can only be observed after delignification and protofibrils can only be observed after hemicellulose hydrolysis. In order to extract as much cellulose as possible, chemical treatment is used to remove hemicellulose and lignin. It can be seen that the cellulose has been sinking at the bottom of the glass bottle during the chemical treatment process, and the sodium chlorite treatment mainly removes the lignin in the wood powder, and after the acid treatment, it can be clearly seen that the color of the wood powder changes from the original The yellow color changes to white, which indicates that most of the lignin has been removed during the first acid treatm...

Embodiment 3

[0054] Cellulose solution after chemical acid and alkali treatment after physical and mechanical treatment:

[0055] After chemical treatment of wood fibers, what remains is almost entirely composed of cellulose, which requires physical and mechanical treatment to disperse the cellulose into microfibrils. Microfibril is not a new substance, it is the most basic unit of cell wall skeleton material. When forming the cell wall, many chain-like cellulose molecules are regularly arranged into molecular clusters (micelles), which are further combined into biological structural units called microfibrils. Aggregations of many microfibrils can become macrofibrils, cellulose, visible under a light microscope. After the wood powder is chemically treated, the color turns white and almost all settle at the bottom of the glass bottle. This is because the undispersed cellulose contains too many aggregates. The density of cellulose is greater than that of water, so it has been sinking at...

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Abstract

The present invention relates to a cellulose nano-fibril/epoxy resin composite film preparation method, which comprises the following steps: a) purifying a raw material; 2) carrying out chemical treatments, wherein the chemical treatments comprise three acid treatments and two alkali treatments; 3) carrying out physical treatments, wherein the physical treatments contain three mechanical treatments such as ultrasonic crushing, grinding through a grinding machine, and a high pressure homogenizer; 4) preparing a fiber nano-fibril film; and 5) preparing a cellulose nano-fibril/epoxy resin composite material. According to the present invention, the prepared cellulose nano-fibril has a diameter of 20-80 nm, the nano-cellulose film has a tensile strength of 159.2 MPa and an elastic modulus of 7.3 GPa, transmittance of the nano-cellulose resin film is 86%, the cellulose film has characteristics of high length-diameter ratio, uniform fiber diameter distribution, good thermal stability, and a thermal expansion coefficient of 14 ppm/K, and the film can be widely applied in the fields of high temperature resistance flexible electronic device light transmittance films, optically transparent functional paper, gas barrier packaging materials, tissue engineering materials, filtration membrane materials and the like.

Description

technical field [0001] The invention relates to a preparation method of a cellulose nanofiber / epoxy resin composite film, which belongs to the technical field of composite materials. Background technique [0002] The preparation of nanocellulose fibrils can basically summarize several preparation methods: [0003] (1) The physical method is to process wood pulp with an ultrasonic pulverizer, high-speed mixer, grinder or high-pressure homogenizer, and a microfibrillated cellulose can be obtained, and a nano-scale network structure of cellulose can be obtained , whose fiber diameter is between 10 and 100 nm, and can be used to prepare transparent high-strength nanocomposites. [0004] (2) The most important method of chemically treating plants to prepare nanocellulose is acid or alkali hydrolysis, which also includes treatment with surfactants or biological enzymes. Generally, after the wood fiber is pretreated and bleached, the bleached fiber is hydrolyzed with a certain co...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L1/02C08J5/06D21B1/02
Inventor 李大纲潘佳陈振东李雪婷胡月薛莹莹李明珠
Owner NANJING FORESTRY UNIV
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