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A preparation method of nanocrystalline cellulose composite material, products made therefrom and uses thereof

A technology of nanocrystals and composite materials, applied in the field of composite material preparation, can solve the problems of poor performance of polylactic acid/nanocellulose composite materials, poor dispersion of polyethylene glycol/nanocellulose blends, and difficulty in dispersion , to achieve the effect of facilitating continuous production, avoiding easy agglomeration, and shortening operation time

Active Publication Date: 2017-01-11
珠海市红旌发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this preparation method, the nanocellulose suspension is mixed with the polyethylene glycol solution and then magnetically stirred under heating in a water bath at 90°C. This method is actually difficult to achieve the purpose of uniformly dispersing the nanocellulose, because the method prepared The nanocellulose suspension is a relatively viscous colloid, and it is very difficult to disperse by magnetic stirring; in addition, the solvent volatilizes quickly under heating in a water bath, and the concentration of nanocellulose is larger, making it easier to coagulate and precipitate; this method is followed by evaporation of solvent, vacuum The drying step makes the nanocellulose easy to repolymerize and precipitate, so the obtained polyethylene glycol / nanocellulose blend actually has poor dispersibility, and the resulting polylactic acid / nanocellulose composite material has poor performance

Method used

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  • A preparation method of nanocrystalline cellulose composite material, products made therefrom and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100 parts of deionized water, 5 parts of nanocrystalline cellulose and 10 parts of polyethylene glycol 600000, put them into a high-pressure homogenizer, and homogenize at 20 MPa for 10 minutes to obtain a dispersion suspension of nanocrystalline cellulose and polyethylene glycol 6000. The dispersed suspension was put into a lyophilizer, and lyophilized at -80° C. under a vacuum pressure of 10 Pa for 8 hours to obtain a blocky solid, which was pulverized into powder by a pulverizer.

[0029] Add the obtained powder and 100 parts of polylactic acid resin to a twin-screw extruder for blending and granulation. The twin-screw extruder is multi-stage temperature-controlled. Speed ​​30rpm. The obtained particles are dried to remove moisture to obtain a nanocrystalline cellulose degradable composite material. The composite material was taken to prepare a test sample, and its physical and mechanical properties were tested. The test results are shown in Table 1.

Embodiment 2

[0031] Take 100 parts of deionized water, 4 parts of nanocrystalline cellulose and 8 parts of polyethylene glycol 60000, add them into a high-pressure homogenizer, and homogenize at 20 MPa for 10 minutes to obtain a dispersion suspension of nanocrystalline cellulose and polyethylene glycol 6000. The dispersed suspension was put into a lyophilizer, and lyophilized at -80° C. under a vacuum pressure of 10 Pa for 6 hours to obtain a blocky solid, which was pulverized into powder by a pulverizer.

[0032] Add the obtained powder and 100 parts of polylactic acid resin to a twin-screw extruder for blending and granulation. The twin-screw extruder is multi-stage temperature-controlled. Speed ​​30rpm. The obtained particles were dried to remove moisture to obtain a nanocrystalline cellulose degradable composite material. The composite material was taken to prepare a test sample, and its physical and mechanical properties were tested. The test results are shown in Table 1.

Embodiment 3

[0034] Take 100 parts of deionized water, 3 parts of nanocrystalline cellulose and 15 parts of polyethylene glycol 600015, put them into a high-pressure homogenizer, and homogenize at 20 MPa for 10 minutes to obtain a dispersion suspension of nanocrystalline cellulose and polyethylene glycol 6000. The dispersed suspension was put into a lyophilizer, and lyophilized at -80° C. under a vacuum pressure of 10 Pa for 8 hours to obtain a blocky solid, which was pulverized into powder by a pulverizer.

[0035] Add the obtained powder and 100 parts of polylactic acid resin to a twin-screw extruder for blending and granulation. The twin-screw extruder is multi-stage temperature-controlled. Speed ​​30rpm. The obtained particles were dried to remove moisture to obtain a nanocrystalline cellulose degradable composite material. The composite material was taken to prepare a test sample, and its physical and mechanical properties were tested. The test results are shown in Table 1.

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Abstract

The invention discloses a preparation method for a nanocrystal cellulose composite material. The method includes: taking 100 parts by weight of a degradable polymer, 0.5-8 parts by weight of nanocrystal cellulose, and 3-20 parts by weight of a water soluble polymer, firstly mixing the nanocrystal cellulose, the water soluble polymer and deionized water evenly by a high-pressure homogenizer to obtain a dispersed suspension solution, freeze drying the dispersed suspension solution by a freeze dryer and performing grinding to obtain powder particles, then adding the powder particles and the degradable polymer into a twin-screw extruder, and carrying out blending and extrusion granulation, thus obtaining the nanocrystal cellulose composite material. The invention also discloses the nanocrystal cellulose composite material obtained by the method and application of the material in preparation of food packaging and biomedical materials.

Description

technical field [0001] The invention relates to a preparation method of a composite material, a product made from it and its application. Background technique [0002] Nanocrystalline cellulose (NCC), also known as nanocellulose crystals, is a typical rod-shaped cellulose whisker with a diameter of 1-100 nanometers and a length of tens to hundreds of nanometers. Nanocrystalline cellulose can be prepared from natural or synthetic cellulose by various methods. Since the supramolecular structure of cellulose is a system of interlaced crystalline regions and non-crystalline regions, in which the non-crystalline regions are loosely arranged, under the action of acids, enzymes, oxidants, etc., the non-crystalline regions will react preferentially over the crystalline regions. , Generate small molecules and be removed, so as to obtain nanoscale cellulose crystals, that is, nanocrystalline cellulose. Nanocrystalline cellulose materials have the characteristics of regeneration, low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08L1/02C08L39/06C08L29/04C08L71/08B29B9/06
Inventor 蓝海包昀鑫时圣涛
Owner 珠海市红旌发展有限公司
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