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Method for preparing nano cellulose microfibril reinforced polymer composite material

A technology for nanocellulose and composite materials, which is applied in the field of preparing nanocellulose microfiber-reinforced polymer composite materials, can solve the problems of limited application scope, complicated preparation methods, and difficulty in realizing uniform dispersion of water-insoluble polymers, and achieves structural Uniform and simple preparation process

Active Publication Date: 2014-03-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method is not only loaded down with trivial details, and the generally prepared nanocellulose microfibrils or microcrystals are suspensions with water as the medium, it is difficult to achieve uniform dispersion in most water-insoluble polymers, especially cellulose matrices, greatly limit its scope of application

Method used

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  • Method for preparing nano cellulose microfibril reinforced polymer composite material
  • Method for preparing nano cellulose microfibril reinforced polymer composite material
  • Method for preparing nano cellulose microfibril reinforced polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, prepare the composite film of nanocellulose microfiber reinforced keratin

[0032] Weigh dry microcrystalline cellulose (polymerization degree 220) and keratin (mass ratio of dry microcrystalline cellulose to keratin is 1:3) dried under vacuum at 80°C for 12 hours, and add them into [HPy]PF6, The mass concentration of the prepared total solution is 20%. After stirring and dispersing evenly, put it into an oil bath, control the dissolution temperature at 60°C, and carry out mechanical stirring. The dissolution time was controlled at 4 hours, and a transparent and clear solution was obtained after vacuum defoaming. An ionic liquid solution of cellulose / keratin was thus prepared. Lay the film on a 40-60°C heating plate, put it into a water coagulation bath to cool and shape. The ionic liquid is washed away with distilled water, and dried in a vacuum oven to obtain a transparent nanocellulose microfiber-reinforced keratin composite material film. The tensi...

Embodiment 2

[0033] Embodiment 2, prepare the composite fiber of nanocellulose microfiber reinforced polystyrene sulfonic acid

[0034] Weigh the absorbent cotton (polymerization degree 1600) and polystyrene sulfonic acid (the mass ratio of absorbent cotton to polystyrenesulfonic acid is 1:1) that has been vacuum-dried at 80°C for 12 hours, and add them to BMIMCl to prepare the total solution The concentration is 40%. After stirring and dispersing evenly, put it into an oil bath, and control the dissolution temperature at 90°C. And carry out mechanical stirring. The dissolution time was controlled at 1 h, and a transparent and clear solution was obtained after vacuum defoaming. A cellulose / polystyrene sulfonic acid ionic liquid solution was thus prepared. Spinning by wet spinning on small spinning equipment. The spinneret hole diameter is 80-100 μm, the coagulation bath is a mixed solution of BMIMCl and water, and the temperature is 20-40°C. After stretching, water washing, stretching...

Embodiment 3

[0035] Embodiment 3, the composite material fiber of nanofiber microfiber reinforced cellulose acetate

[0036] Weigh bamboo pulp (polymerization degree 800) and cellulose acetate (mass ratio of bamboo pulp to cellulose acetate is 2:3) that have been vacuum-dried at 80°C for 12 hours, and add them to [MPy]MA to prepare the total The solution concentration is 25%. After stirring and dispersing evenly, put it into an oil bath, control the temperature of the solution at 100°C, and carry out mechanical stirring. Control the dissolution time at 0.5h, and obtain a transparent and clear solution after vacuum defoaming. Thus a bamboo pulp / cellulose acetate / ionic liquid solution was prepared. Spinning by wet spinning on small spinning equipment. The diameter of the spinneret hole is 80-100 μm, the coagulation bath is water, and the temperature is 20-40°C. After drawing, washing, drawing and drying, the composite material fiber of nanofiber and microfiber reinforced cellulose acetat...

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Abstract

The invention discloses a method for in situ generating a nano cellulose microfibril reinforced polymer composite material, comprising the following steps: using ionic liquid as a primary solvent, dissolving cellulose, or mixing cellulose with other polymers via solution mixing, and controlling the solubility of the cellulosic material in the solvent to maintain naturally occurring nano cellulose microfibril in the cellulosic material, so as to in situ obtain the nano cellulose microfibril reinforced polymer composite material. The nano microfibril can be observed under a transmission microscope obviously, which is different from the completely dissolved cellulose solution. In the preparing process, the dissolving temperature is controlled within 30-150 DEG C, and stirring and vacuum deaeration are used as auxiliary. By controlling the dissolving time, solution concentration and ratio of mixing, a polymer solution containing cellulose microfibril with dimension of 5-300 nanometers can be obtained. The polymer solution can be used for preparing composite material fiber, hollow fibrous membrane, diaphragm, film, gel, porous material and other known applications of enhanced material.

Description

technical field [0001] The invention relates to a method for preparing a nanocellulose microfiber reinforced polymer composite material. Background technique [0002] With the increasing global environmental pollution and the sharp depletion of petroleum energy and natural resources, as well as the improvement of public environmental awareness, sustainable development, industrial ecology and green chemistry will dominate the direction of materials, industrial products and processes in the future. Biocompatible composite materials obtained from renewable biological resources can replace synthetic polymers and reduce the global dependence on fossil fuel energy, which is an emerging material with great potential. Cellulose is the most abundant natural polymer (the annual regeneration capacity of cellulose alone reaches 1.0×10 10 Ton), and due to the characteristics of the aggregated structure (high crystallinity, intermolecular and intramolecular hydrogen bonds), it has excell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L89/00C08L1/02C08J5/04C08J3/11D01F8/02D01F8/10C08L5/08D01F8/12C08L79/02D01F8/16D01F8/08C08L5/02C08L3/02C08L1/14
CPCY02P20/54
Inventor 张军罗楠张金明武进何嘉松
Owner INST OF CHEM CHINESE ACAD OF SCI
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