WO2013078936A1 - 一种能稳定分散的纤维素纳米纤维的制备方法 - Google Patents
一种能稳定分散的纤维素纳米纤维的制备方法 Download PDFInfo
- Publication number
- WO2013078936A1 WO2013078936A1 PCT/CN2012/084128 CN2012084128W WO2013078936A1 WO 2013078936 A1 WO2013078936 A1 WO 2013078936A1 CN 2012084128 W CN2012084128 W CN 2012084128W WO 2013078936 A1 WO2013078936 A1 WO 2013078936A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cellulose
- cellulose nanofiber
- preparing
- organic solvent
- natural
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/12—Cellulose acetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B16/00—Regeneration of cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/20—Esterification with maintenance of the fibrous structure of the cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
- D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/56—Non-aqueous solutions or dispersions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Definitions
- the invention belongs to the field of manufacture of nano materials, and particularly relates to a high-efficiency and high-volume preparation method based on natural plants (including herbs, woody plants) and nanofibers which can be stably dispersed.
- Cellulose includes natural cellulose (crystal structure is cellulose I) and regenerated cellulose (crystal structure is cellulose 11), which form a fine fiber structure by a certain degree of crystallization; the thickness of these fine fibers varies with the cellulose material Types (wood, cotton, hemp, rayon, etc.) vary widely, typically in the range of a few nanometers to tens of nanometers; cellulose fibers of this size range, commonly referred to as cellulose nanofibers .
- the bonding is very strong, so that the preparation of the cellulose nanofibers is particularly difficult, and a special treatment process is required.
- Cellulose nanofibers have a very high mechanical strength and specific surface area, and their addition to synthetic resins can provide composite materials having excellent properties. Therefore, many people have attempted to prepare nanocellulose from natural cellulose.
- Currently available technologies include:
- High-pressure homogenizer method Water is added to the cellulose raw material, and crushed to a certain extent as a suspension by a pulverizer. The suspension is nanonized by a high pressure homogenizer during which high pressure causes the liquid to be ejected from the thin tube and then impinges on the solid wall.
- the cellulose microfibers prepared by such a method have been commercialized by the Daicel chemical industry in Japan; the disadvantage of this treatment method is that the high-pressure homogenizer has a long processing time, low production efficiency, and incomplete dispersion. , the product does not reach the level of nanofiber.
- Rotary crushing treatment method The machine used in this method is a machine that is further precision-finished based on a refiner and a beater used for microfibrillating pulp fibers in a paper mill; The efficiency is high, but the degree of dispersion is not complete enough.
- Ball milling method The cellulose raw material and a certain dispersion solvent are added into a closed ball mill tank containing a plurality of hard balls of metal or ceramic, and the cellulose is dissociated by the impact of the hard ball during the vibration of the ball mill tank; most of the dispersed solvent used For water, too It may be an organic solvent; however, the dispersion efficiency is not very high, and it takes a long time to decompose into nanofibers.
- this ball milling method to mix cellulose and synthetic resin in a ball milling process [T. Endo, . Kitagawa, F. Zhang, T. Hirotsu, J. Hosokawa, Chemistry Letters, 1999, 11 , 1155 -1156. ], but such mixing only remains in the large scale, not up to the nanometer level.
- the third method is the easiest to reach the nanofiber level, and in all of the above methods, almost all of the water is used as a dispersing agent; therefore, the surface of the nanofiber prepared by the above method has a hydroxyl group (in the third method) It is hydrophilic when it is a carboxyl group; when this hydrophilic substance is added to a synthetic resin, on the one hand, the compatibility and the contact property with the resin matrix are too low to affect the mixing effect, thereby causing a cellulose pair. The reinforcing effect of the resin is not good, and on the other hand, the obtained composite has poor water resistance.
- the technical problem to be solved by the present invention is to provide a method for preparing cellulose nanofibers; the method of the invention is characterized in that mechanical crushing and surface modification are simultaneously performed, that is, simultaneous mechanical esterification is accompanied by esterification reaction simultaneously,
- the high-efficiency and high-volume characteristics of the cellulose treated by this method maintain a fine fibrous structure, and the interface with the adjacent fine fibers is esterified by the introduction of the esterification group to cause dissociation.
- a method for preparing a cellulose nanofiber of the present invention comprises the following steps:
- the cellulose is cellulose of a natural plant.
- the cellulose of the natural plant is a natural herb or a natural woody plant.
- the cellulose is one or more of natural cellulose or regenerated cellulose of natural woody plants.
- the organic solvent is an organic solvent without a hydroxyl group.
- the organic solvent without hydroxyl group includes acetone, formamide, acetamide, hydrazine, hydrazine-dimethylformyl Amine, hydrazine, hydrazine-dimethylacetamide, aniline, tetrahydrofuran, diethyl ether, benzene, toluene, xylene, chlorobenzene, hexane, dimethyl sulfoxide, dioxane, ethyl acetate, acetic acid, acetonitrile, Pyridine, methacrylic acid or chloroform; the main function is a non-aqueous solvent, especially an aprotic polar solution as a dispersing solvent.
- the esterifying agent comprises an acid chloride (such as acetyl chloride, butyryl chloride, hexanoyl chloride, lauroyl chloride), an acid anhydride (such as acetic anhydride, succinic anhydride, maleic anhydride); and a moisture content for improving esterification efficiency. It should be as low as possible.
- the reaction system belongs to the heterogeneous esterification reaction of cellulose, and the esterification only occurs on the hydroxyl group on the surface of the cellulose.
- the physical crushing comprises ball milling, disc grinding, a high pressure homogenizer, an ultrasonic breaker or a mortar crushing method.
- the surface of the surface-esterified cellulose nanofiber obtained by the method of the present invention is hydrophobized by an alkyl molecular chain or the like, and the dispersing solvent may be DMF or solvent-substituted with another solvent, and the cellulose nanofiber can be stabilized. Dispersed in organic solvent; due to the simple preparation process and high yield, it is expected to achieve large-scale production of cellulose nanofibers; and when compared with synthetic resin, it is compatible with untreated cellulose. Better and thus increase the strength of the composite.
- Example 1 is a flow birefringence phenomenon of a product obtained in Example 1 of the present invention through a polarizer;
- Example 2 is a photograph of cellulose oxime after esterification and dispersion according to Example 1 of the present invention.
- Fig. 3 is a photograph showing the redispersion of the cellulose obtained in Example 1 of the present invention after drying.
- a method for preparing a cellulose nanofiber capable of stably dispersing comprises the following steps:
- a method for preparing a cellulose nanofiber capable of stably dispersing comprises the following steps:
- a method for preparing a cellulose nanofiber capable of stably dispersing comprises the following steps:
- a method for preparing a cellulose nanofiber capable of stably dispersing comprises the following steps:
- a method for preparing a cellulose nanofiber capable of stably dispersing comprises the following steps:
- Example 1 was repeated except that the organic solvent was dimethyl sulfoxide and the esterifying agent was lauroyl chloride.
- Example 2 was repeated except that the organic solvent was dioxane and the esterifying agent was maleic anhydride.
- Example 3 was repeated except that the organic solvent was ethyl acetate and the esterifying agent was acetyl chloride.
- Example 9
- Example 4 was repeated except that the organic solvent was acetic acid and the esterifying agent was acetyl chloride.
- Example 10
- Example 5 was repeated except that the organic solvent was acetone and the esterifying agent was acetyl chloride.
- Example 11
- Example 1 was repeated except that the organic solvent was acetonitrile and the esterifying agent was butyryl chloride.
- Example 12
- Example 2 was repeated except that the organic solvent was pyridine and the esterifying agent was lauroyl chloride.
- Example 13
- Example 3 was repeated except that the organic solvent was methacrylic acid and the esterifying agent was maleic anhydride.
- Example 1 was repeated except that the organic solvent was acetamide and the esterifying agent was butyryl chloride.
- Example 15
- Example 2 was repeated except that the organic solvent was diethyl ether and the esterifying agent was lauroyl chloride.
- Example 16
- Example 3 was repeated except that the organic solvent was benzene and the esterifying agent was maleic anhydride.
- Example 17
- Example 1 was repeated except that the organic solvent was toluene and the esterifying agent was acetic anhydride.
- Example 18
- Example 2 was repeated except that the organic solvent was xylene.
- Example 3 was repeated except that the organic solvent was chlorobenzene.
- Example 1 was repeated except that the organic solvent was hexane.
- Example 2 was repeated except that the organic solvent was aniline.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12852751.2A EP2787105A4 (en) | 2011-11-30 | 2012-11-06 | METHOD FOR PRODUCING A STABLE DISPERSIBLE CELLULOSE ANODIFIER |
JP2014543758A JP2015500354A (ja) | 2011-11-30 | 2012-11-06 | 安定に分散可能なセルロースナノファイバーの製造方法 |
US14/361,861 US9725583B2 (en) | 2011-11-30 | 2012-11-06 | Method for preparing cellulose nanofiber capable of being stably dispersed |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201110391262.1 | 2011-11-30 | ||
CN201110391262.1A CN103132169B (zh) | 2011-11-30 | 2011-11-30 | 一种能稳定分散的纤维素纳米纤维的制备方法 |
Publications (1)
Publication Number | Publication Date |
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WO2013078936A1 true WO2013078936A1 (zh) | 2013-06-06 |
Family
ID=48492594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2012/084128 WO2013078936A1 (zh) | 2011-11-30 | 2012-11-06 | 一种能稳定分散的纤维素纳米纤维的制备方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9725583B2 (zh) |
EP (1) | EP2787105A4 (zh) |
JP (1) | JP2015500354A (zh) |
CN (1) | CN103132169B (zh) |
WO (1) | WO2013078936A1 (zh) |
Cited By (1)
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- 2012-11-06 JP JP2014543758A patent/JP2015500354A/ja active Pending
- 2012-11-06 WO PCT/CN2012/084128 patent/WO2013078936A1/zh active Application Filing
- 2012-11-06 EP EP12852751.2A patent/EP2787105A4/en not_active Withdrawn
- 2012-11-06 US US14/361,861 patent/US9725583B2/en active Active
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20160019753A (ko) * | 2014-08-12 | 2016-02-22 | 한국원자력연구원 | 나노셀룰로오스의 제조방법 |
KR101686551B1 (ko) | 2014-08-12 | 2016-12-16 | 한국원자력연구원 | 나노셀룰로오스의 제조방법 |
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Publication number | Publication date |
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JP2015500354A (ja) | 2015-01-05 |
EP2787105A1 (en) | 2014-10-08 |
CN103132169A (zh) | 2013-06-05 |
US20140299019A1 (en) | 2014-10-09 |
US9725583B2 (en) | 2017-08-08 |
CN103132169B (zh) | 2015-09-16 |
EP2787105A4 (en) | 2015-07-29 |
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