WO2011114987A1 - セルロース分散液およびその製造方法ならびにそれを用いた成形体 - Google Patents
セルロース分散液およびその製造方法ならびにそれを用いた成形体 Download PDFInfo
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- WO2011114987A1 WO2011114987A1 PCT/JP2011/055665 JP2011055665W WO2011114987A1 WO 2011114987 A1 WO2011114987 A1 WO 2011114987A1 JP 2011055665 W JP2011055665 W JP 2011055665W WO 2011114987 A1 WO2011114987 A1 WO 2011114987A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/05—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
- C08B15/02—Oxycellulose; Hydrocellulose; Cellulosehydrate, e.g. microcrystalline cellulose
- C08B15/04—Carboxycellulose, e.g. prepared by oxidation with nitrogen dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
- C08J3/095—Oxygen containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/11—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids from solid polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/02—Direct processing of dispersions, e.g. latex, to articles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- 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
- C08L1/02—Cellulose; Modified cellulose
- C08L1/04—Oxycellulose; Hydrocellulose, e.g. microcrystalline cellulose
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/20—Chemically or biochemically modified fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/04—Oxycellulose; Hydrocellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
- C08J2401/04—Oxycellulose; Hydrocellulose
Definitions
- the present invention relates to a cellulose dispersion, a production method thereof, and a molded body thereof. Specifically, the present invention relates to a cellulose dispersion having various kinds of particle sizes, large and small, a manufacturing method thereof, and a molded body thereof.
- Cellulose is contained in plant cell walls, microbial exocrine secretions, and sea squirt mantles, and is the most abundant polysaccharide on the earth. It has biodegradability, high crystallinity, stability, It is excellent in safety and is attracting attention as an environmentally friendly material. Therefore, application development is expected in various fields.
- TEMPO 2,2,6,6-tetramethylpiperidinooxy radical
- the method of converting to a carboxyl group has been attracting much attention in recent years because it can selectively oxidize only the primary hydroxyl group and can carry out the reaction under mild conditions such as aqueous system and room temperature. Yes.
- Patent Document 1 describes an invention relating to a method for producing fine cellulose by oxidizing cellulose by a TEMPO oxidation reaction and then applying a mechanical treatment.
- Patent Document 1 only the particle size of cellulose before being refined is described, and since an ultra-high pressure homogenizer is used for the device for further refinement, most cellulose is very small in the volume particle size distribution. Only a sharp particle size peak refined (50 ⁇ m or less) can be obtained. Since the particle size is small and fine, after that, for example, it is possible to develop gas barrier properties when coated or filmed as a gas barrier agent, but it becomes a brittle film such as cracks due to lack of flexibility. There is a risk that.
- the present invention has been made in view of the above problems, and is a cellulose dispersion capable of controlling the particle size peak of the fine cellulose obtained even when mechanical treatment is applied to oxidized cellulose.
- An object is to provide a liquid, and to provide a molded article having sufficient flexibility and gas barrier properties without generating cracks or the like when fine cellulose is molded.
- the invention according to claim 1 is a cellulose dispersion containing at least fine oxidized cellulose, and the volume-based particle size distribution of the fine oxidized cellulose is 0.01 ⁇ m or more and 100 ⁇ m or less.
- the cellulose dispersion is characterized in that it has a volume-based particle size range of 2 and has a particle size peak of 2 or more.
- the invention according to claim 2 is the cellulose dispersion according to claim 1, wherein the finely oxidized cellulose is cellulose obtained by oxidizing and refining natural cellulose having a cellulose I-type crystal structure. It is.
- the invention according to claim 3 is characterized in that the fine oxidized cellulose has a carboxyl group, and the amount of the carboxyl group is 1.0 mmol / g or more and 2.0 mmol / g or less. 2.
- the volume-based particle size distribution has one or more particle size peaks in the range of a volume-based particle size of 0.01 ⁇ m or more and 1 ⁇ m or less, and 1 ⁇ m or more and 100 ⁇ m or less.
- the invention according to claim 5 is characterized in that the dispersion medium of the cellulose dispersion is one or more solvents selected from water, methanol, ethanol and isopropyl alcohol. It is a cellulose dispersion liquid of description.
- the invention described in claim 6 is a molded body formed from the cellulose dispersion liquid described in claim 5.
- the invention described in claim 7 is a molded article formed by applying the cellulose dispersion according to claim 5 on a substrate and drying it.
- the invention according to claim 8 is a method for producing a cellulose dispersion containing at least fine oxidized cellulose, the step of oxidizing cellulose to prepare oxidized cellulose, and dispersing the oxidized cellulose in a dispersion medium, The step of refining the oxidized cellulose to prepare a cellulose dispersion containing fine oxidized cellulose having a volume-based particle size distribution in the range of a volume-based particle size of 0.01 ⁇ m or more and 100 ⁇ m or less and having two or more particle size peaks. It is a manufacturing method of the cellulose dispersion liquid characterized by comprising.
- the invention according to claim 9 is the method for producing a cellulose dispersion according to claim 8, wherein the means for refining the oxidized cellulose is an ultrasonic homogenizer.
- the invention according to claim 10 is the step of preparing the cellulose dispersion, wherein the oxidized cellulose is refined, and the volume reference particle size distribution is in the range of a volume reference particle size of 0.01 ⁇ m or more and 100 ⁇ m or less, 9. Two or more kinds of dispersion liquids containing fine oxidized cellulose having two or more particle size peaks are prepared, and the two or more kinds of dispersion liquids are mixed to prepare a cellulose dispersion liquid. It is a manufacturing method of the cellulose dispersion liquid of description.
- the present invention it is possible to obtain a cellulose dispersion containing fine oxidized cellulose having a particle size peak of 2 or more.
- the cellulose dispersion liquid of the present invention is coated or formed into a film as a gas barrier agent, cellulose having various particle diameters is present in the film, so that it is difficult to generate cracks and the like while maintaining a sufficient gas barrier property. It becomes possible to create a flexible film.
- the cellulose dispersion of the present invention is a dispersion in which the volume-based particle size distribution of fine oxidized cellulose contained in the liquid has a particle size peak of 2 or more.
- the volume-based particle size distribution is a distribution obtained by measuring the distribution of particles in the cellulose dispersion on a volume basis.
- the volume-based particle size is a particle size obtained by measuring particles in the cellulose dispersion on a volume basis.
- the particle size peak is a peak of a volume-based particle size distribution.
- the finely oxidized cellulose contained in the cellulose dispersion of the present invention has a three-dimensional shape such as a fiber shape, a particle shape or an indefinite shape, in particular, a fiber shape. The size of was specified.
- the cellulose dispersion of the present invention has two or more kinds of finely oxidized celluloses having different particle size peaks, when a film is formed using this cellulose dispersion, two or more kinds of finely oxidized celluloses overlap each other, A film having flexibility can be obtained while maintaining gas barrier properties.
- the volume-based particle size distribution of fine oxidized cellulose contained in the liquid is in the range of a volume-based particle size of 0.01 ⁇ m or more and 100 ⁇ m or less. By satisfying this range, good transparency is exhibited in the visible light region (400 to 700 nm).
- the volume-based particle size distribution of finely oxidized cellulose contained in the cellulose dispersion has one or more particle size peaks in the volume-based particle size range of 0.01 ⁇ m or more and 1 ⁇ m or less. And having a particle size peak of 1 or 2 or more in a volume reference particle size range of 1 ⁇ m or more and 100 ⁇ m or less.
- fine oxidized celluloses of 0.01 ⁇ m or more and 1 ⁇ m or less are closely overlapped, and in order to carry flexibility, larger fine oxidized celluloses (1 ⁇ m or more and 100 ⁇ m or more). The following is preferable.
- the cellulose dispersion of the present invention has various particle sizes, both large and small, and exists so that the small fine oxidized cellulose fills the gaps between the large fine oxidized cellulose, so that it has flexibility while maintaining gas barrier properties. It becomes possible to obtain the provided membrane.
- the finely oxidized cellulose contained in the cellulose dispersion of the present invention has a carboxyl group, and the amount of the carboxyl group is preferably 1.0 mmol / g or more and 2.0 mmol / g or less. If it is less than 1.0 mmol / g, it will be difficult to uniformly disperse the fine oxidized cellulose without sufficient electrostatic repulsion even if mechanical treatment is subsequently applied. As a result, problems such as poor transparency of the dispersion arise. On the other hand, when the amount is more than 2.0 mmol / g, decomposition of cellulose at the time of dispersion is severe, and problems such as yellowing tend to occur.
- the fine oxidized cellulose of the present invention preferably has a carboxyl group on the surface of the fine oxidized cellulose.
- electrostatic repulsion between the fine oxidized celluloses can be sufficiently generated.
- the volume average particle diameter of fine oxidized cellulose contained in the cellulose dispersion of the present invention is preferably 0.01 ⁇ m or more and 50 ⁇ m or less. By being within this range, both the strength of the film and the gas barrier property can be achieved.
- a volume average particle diameter is an average value of the particle diameter which measured the particle
- Oxidized cellulose is obtained by oxidation of cellulose.
- cellulose As the raw material of cellulose to be oxidized, wood pulp, non-wood pulp, waste paper pulp, cotton, bacterial cellulose, valonia cellulose, squirt cellulose, fine cellulose, microcrystalline cellulose, etc. can be used.
- Natural cellulose having a crystal structure is preferred. When natural cellulose having a cellulose I-type crystal structure is used, it can be oxidized while maintaining a crystalline region that is considered to exhibit gas barrier properties.
- a method for oxidizing cellulose a method using a co-oxidant in the presence of an N-oxyl compound having high selectivity to oxidation of a primary hydroxyl group while maintaining the structure as much as possible under relatively mild conditions in an aqueous system.
- an N-oxyl compound 2,2,6,6-tetramethyl-1-piperidine-N-oxyl (TEMPO) and the like are preferably used.
- the co-oxidant may promote an oxidation reaction such as halogen, hypohalous acid, halous acid or perhalogen acid, or a salt thereof, halogen oxide, nitrogen oxide, or peroxide. Any oxidant can be used if possible.
- Sodium hypochlorite is preferred because of its availability and reactivity.
- the reaction when the reaction is carried out in the presence of bromide or iodide, the oxidation reaction can proceed smoothly, and the introduction efficiency of the carboxyl group can be improved.
- the amount of TEMPO used as the N-oxyl compound is sufficient if it has an amount that functions as a catalyst.
- As bromide a system using sodium bromide or lithium bromide is preferable, and sodium bromide is more preferable from the viewpoint of cost and stability.
- the amount of the co-oxidant, bromide or iodide used is sufficient if there is an amount capable of promoting the oxidation reaction.
- the reaction is more preferably pH 9 to 11, but as the oxidation proceeds, carboxyl groups are generated and the pH in the system is lowered. Therefore, the inside of the system needs to be maintained at pH 9 to 11.
- the system alkaline In order to keep the inside of the system alkaline, it can be prepared by adding an alkaline aqueous solution while keeping the pH constant.
- alkaline aqueous solution examples include sodium hydroxide, lithium hydroxide, potassium hydroxide, aqueous ammonia solution, and organic alkalis such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide, and benzyltrimethylammonium hydroxide.
- sodium hydroxide is preferred in view of cost.
- the alcohol to be added is preferably a low molecular weight alcohol such as methanol, ethanol, isopropyl alcohol or the like in order to quickly terminate the reaction. Ethanol is more preferable from the viewpoint of safety of by-products generated by the reaction.
- Cleaning methods for oxidized pulp after oxidation include a method of cleaning while forming an alkali and salt, a method of cleaning by adding an acid to a carboxylic acid, a method of cleaning by adding an organic solvent and making it unnecessary. is there.
- a method of adding an acid to obtain a carboxylic acid for washing is preferred.
- the washing solvent is preferably water.
- the oxidized cellulose is immersed in a dispersion medium, and then the pH of the dispersion is adjusted.
- the pH of the dispersion is about 4-6, so the pH is adjusted to 6-12 using alkali.
- the dispersion medium used in the present invention is preferably one or more solvents selected from water, methanol, ethanol and isopropyl alcohol. By using these solvents, it is possible to increase the drying speed of the dispersion, improve the wettability, decrease the viscosity, and the like.
- alkali used examples include sodium hydroxide, lithium hydroxide, potassium hydroxide, aqueous ammonia solution, and organic solvents such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide, and benzyltrimethylammonium hydroxide.
- organic solvents such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide, and benzyltrimethylammonium hydroxide.
- alkali examples include alkali.
- Sodium hydroxide is preferable from the viewpoint of cost.
- ultrasonic homogenizer high-pressure homogenizer, ultra-high pressure homogenizer, ball mill, roll mill, cutter mill, planetary mill, jet mill, attritor, grinder, juicer mixer, homomixer It can be made fine by using a dispersion device such as a nanogenizer and an underwater facing collision, or by using two or more of these dispersion devices in combination.
- a cellulose dispersion containing fine oxidized cellulose having a carboxyl group at the C6 position can be obtained by performing such a micronization treatment for an arbitrary time.
- a cellulose dispersion containing fine oxidized cellulose having a particle size peak of 2 or more it is effective to intensively mechanically process a part of the dispersion.
- known mechanical processing can be used, but it is particularly preferable to use an ultrasonic homogenizer.
- an ultrasonic homogenizer By using an ultrasonic homogenizer, the oxidized cellulose can be partially made very fine.
- any of the above-described means for physically refining oxidized cellulose is performed, and the volume-based particle size of the entire oxidized cellulose is determined. Is further reduced to a certain degree, and then, by performing mechanical treatment stepwise using any means, a finely oxidized cellulose having a small volume reference particle diameter and having two or more particle diameter peaks as a whole. It becomes possible to obtain the cellulose dispersion containing.
- a cellulose dispersion containing fine oxidized cellulose having two or more particle size peaks by changing the type of dispersion medium used when the oxidized cellulose is refined. For example, when an alcoholic solvent such as methanol, ethanol, isopropyl alcohol, or the like added to water is used as the solvent, fine oxidized cellulose having a desired particle size peak is included by adjusting the addition amount of the alcoholic solvent. A cellulose dispersion can be obtained.
- an alcoholic solvent such as methanol, ethanol, isopropyl alcohol, or the like added to water
- the molded product of the present invention is formed by applying the cellulose dispersion of the present invention to a cast or substrate and drying it. Molded products are generally in the form of films or sheets, but other molded products such as cups, bottles, tapes, hollows, pipes, tubes, rods, profile extrusions, injections What can be obtained by various molded articles, such as a molded article, can be illustrated.
- ⁇ Plastic material can be used for the base material.
- plastic materials include polyester-based materials such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin-based materials such as polyethylene and polypropylene, polystyrene films, polyamides such as nylon, polycarbonate, and polyacrylonitrile (PAN). And polyimide.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- polyolefin-based materials such as polyethylene and polypropylene
- polystyrene films polyamides such as nylon, polycarbonate, and polyacrylonitrile (PAN).
- PAN polyacrylonitrile
- polyimide polyimide
- polyvinyl chloride, cellulose, triacetyl cellulose, polyvinyl alcohol, polyurethane, or the like can be used.
- a base material derived from a natural material can be used.
- a base material derived from a natural material polylactic acid, biopolyolefin, hydroxyalkanoate or the like may be used.
- the paper etc. which pass through processes, such as pulping of wood and vegetation, and papermaking, etc. can also be used.
- a coating method of the cellulose dispersion of the present invention a comma coater, a roll coater, a reverse roll coater, a direct gravure coater, a reverse gravure coater, an offset gravure coater, a roll kiss coater, a reverse kiss coater, a micro gravure coater, an air doctor coater, A coating method using a knife coater, bar coater, wire bar coater, die coater, dip coater, blade coater, brush coater, curtain coater, die slot coater or the like can be used.
- the coating film applied to the molded substrate is peeled off to form a film or sheet formed of a coating layer alone.
- examples thereof include a method for obtaining a body, and a method for obtaining a film or sheet by casting.
- Example 1 ⁇ Dispersion of oxidized pulp> 1 g of the oxidized pulp of the above production example was dispersed in 99 g of distilled water and adjusted to pH 10 using an aqueous sodium hydroxide solution. The prepared dispersion was refined with an ultrasonic homogenizer for 15 minutes to obtain a 1% cellulose dispersion.
- Example 2 A 1% cellulose dispersion was obtained in the same manner as in Example 1 except that the refining time was 10 minutes.
- Example 4 0.5 g of oxidized pulp of the above production example was dispersed in 49.5 g of distilled water and adjusted to pH 10 using an aqueous sodium hydroxide solution. The adjusted dispersion was refined with a juicer mixer for 60 minutes to obtain a 1% cellulose dispersion. Further, the same treatment was performed except that the refining treatment time was 10 minutes to obtain another 1% cellulose dispersion. Each dispersion was mixed to obtain a 1% cellulose dispersion.
- Example 5 0.5 g of oxidized pulp of the above production example was dispersed in 49.5 g of distilled water and adjusted to pH 10 using an aqueous sodium hydroxide solution. The prepared dispersion was treated for 10 passes at 200 MPa using an ultrahigh pressure homogenizer to obtain a 1% cellulose dispersion. In addition, the same treatment was performed except that the pressure was changed to 10 MPa for 10 passes to obtain another 1% cellulose dispersion. Each dispersion was mixed to obtain a 1% cellulose dispersion.
- ⁇ Volume-based particle size distribution measurement> The cellulose dispersions of Examples 1 to 3 and Comparative Example 1 were measured using a laser diffraction particle size distribution analyzer (SALD-7000H, manufactured by Shimadzu Corporation). About 200 ml of pure water was circulated in the cell, and the sample was dropped to adjust the concentration to be measurable and measured. The confirmed particle size peak position and volume average particle size are shown in Table 1.
- ⁇ Oxygen permeability measurement> The cellulose dispersions of Examples 1 to 5 and Comparative Examples 1 to 3 were coated on a single-sided corona-treated PET film having a thickness of 12 ⁇ m with a # 20 wire bar and sufficiently dried in a 120 ° C. oven.
- the oxygen permeability of the dried coated PET film was measured using MOCON OX-TRAN 2/21 manufactured by Modern Control in an atmosphere of 25 ° C.-5% RH.
- ⁇ Film viscoelasticity> The cellulose dispersions of Examples 1 to 5 and Comparative Examples 1 to 3 were filled in a predetermined amount in a polystyrene square case and heated in a 50 ° C. oven for 18 hours to obtain a 15 ⁇ m cast film. The obtained film was cut out and a viscoelasticity measuring device (SII Nanotechnology, EXSTARDS100) was used, and a test piece 10 mm ⁇ 20 mm in a tension mode with a frequency of 1 Hz, a heating rate of 2 ° C./min, and a temperature range of 20 ° C.- The viscoelasticity was measured at 50 ° C. (50 mN). E ′ at 25 ° C. was determined.
- ⁇ Transmittance measurement> The light transmittance was measured for the oxidized cellulose dispersions of Examples 1 to 3 and Comparative Examples 1 to 5. A dispersion liquid was put in a quartz sample cell so that bubbles were not mixed, and the light transmittance at a wavelength of 600 nm at an optical path length of 1 cm was measured with a spectrophotometer (JASCO, NRS-1000).
- Table 2 shows the results of oxygen permeability measurement, film viscoelasticity and transmittance measurement.
- the cellulose dispersion obtained by the present invention or a molded product thereof is excellent in gas barrier properties and flexibility, various kinds of containers and packaging materials such as foods, toiletries, chemicals, medical products, electronic members, etc. It is also possible to apply to various fields.
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Abstract
Description
<パルプのTEMPO酸化>
針葉樹晒クラフトパルプ30gを蒸留水1800gに懸濁し、蒸留水200gにTEMPOを0.3g、臭化ナトリウムを3g溶解させた溶液を加え、20℃まで冷却した。ここに1Nの塩酸でpH10に調整した2mol/l、密度1.15g/mlの次亜塩素酸ナトリウム水溶液172gを添加し、酸化反応を開始した。系内の温度は常に20℃に保ち、反応中のpHの低下は0.5Nの水酸化ナトリウム水溶液を添加することでpH10に保ち続けた。セルロースの質量に対して、水酸化ナトリウムが2.85mmol/gになったところで十分量のエタノールを添加し反応を停止させた。その後、pH3になるまで塩酸を添加した後、蒸留水で十分洗浄を繰り返し、酸化パルプを得た。
製造例で得た酸化パルプを固形分重量で0.1g量りとり、1%濃度で水に分散させ、塩酸を加えてpHを3とした。その後、0.5N水酸化ナトリウム水溶液を用いて電導度滴定法により、カルボキシル基量(mmol/g)を求めたところ1.6mmol/gであった。
<酸化パルプの分散>
上記製造例の酸化パルプ1gを99gの蒸留水に分散させ、水酸化ナトリウム水溶液を用いてpH10に調製した。調製した分散液を超音波ホモジナイザーで15分間微細化処理し、1%セルロース分散液を得た。
微細化処理時間を10分間にした以外は、実施例1と同様にして、1%セルロース分散液を得た。
分散媒を蒸留水-エタノール混合溶媒(蒸留水:エタノール=8:2)にした以外は、実施例1と同様にして、1%セルロース分散液を得た。
上記製造例の酸化パルプ0.5gを49.5gの蒸留水に分散させ、水酸化ナトリウム水溶液を用いてpH10に調整した。調整した分散液をジューサーミキサーで60分間微細化処理し、1%セルロース分散液を得た。また、微細化処理時間を10分間にした以外は同様な処理を施し、別の1%セルロース分散液を得た。それぞれの分散液を混合することにより、1%のセルロース分散液を得た。
上記製造例の酸化パルプ0.5gを49.5gの蒸留水に分散させ、水酸化ナトリウム水溶液を用いてpH10に調整した。調整した分散液を超高圧ホモジナイザーを用いて、200MPaで10パス処理し、1%セルロース分散液を得た。また、圧力を100MPaで10パス処理した以外は同様な処理を施し、別の1%セルロース分散液を得た。それぞれの分散液を混合することにより、1%のセルロース分散液を得た。
上記製造例の酸化パルプ1gを99gの蒸留水に分散させ、水酸化ナトリウム水溶液を用いてpH10に調製した。調製した分散液をジューサーミキサーで60分間微細化処理し、1%セルロース分散液を得た。
微細化時間を3分間にした以外は、実施例1と同様にして、1%セルロース分散液を得た。
上記製造例の酸化パルプ1gを99gの蒸留水に分散させ、pH調製はせずにジューサーミキサーで60分間微細化処理し、1%セルロース分散液を得た。
実施例1~3、および比較例1のセルロース分散液を、レーザー回折式粒度分布測定装置(株式会社島津製作所製、SALD-7000H)を用いて測定した。約200mlの純水をセル中に循環させ、サンプルを滴下していくことで測定可能な濃度に調整し測定した。確認された粒径ピーク位置および体積平均粒径を表1に示す。
実施例1~5、および比較例1~3のセルロース分散液を、厚さ12μmの片面コロナ処理PETフィルム上に#20のワイヤーバーでコートし、120℃オーブンで十分乾燥させた。乾燥させたコート済みPETフィルムの酸素透過度をモダンコントロール社製 MOCON OX-TRAN 2/21を用いて25℃-5%RHの雰囲気下で測定した。
実施例1~5、および比較例1~3のセルロース分散液について、ポリスチレン製の角型ケース中に所定量充填して50℃オーブンにて18時間加熱し、15μmのキャストフィルムを得た。得られたフィルムを切り出し、粘弾性測定装置(エスアイアイ・ナノテクノロジー、EXSTARDMS100)を使用し、試験片10mm×20mmについて引張りモードにて周波数1Hz、昇温速度2℃/min、温度範囲20℃~180℃とし、粘弾性測定を行った(50mN)。25℃におけるE’求めた。
実施例1~3、および比較例1~5の酸化セルロース分散液について、光透過率を測定した。石英製のサンプルセルに気泡が混入しないように分散液を入れ、光路長1cmにおける波長600nmの光透過率を分光光度計(日本分光、NRS-1000)にて測定した。
Claims (10)
- 少なくとも微細酸化セルロースを含むセルロース分散液であって、
前記微細酸化セルロースの体積基準粒度分布が、0.01μm以上100μm以下の体積基準粒径の範囲にあり、且つ2以上の粒径ピークを有することを特徴とするセルロース分散液。 - 前記微細酸化セルロースが、セルロースI型の結晶構造を有する天然セルロースを酸化し微細化したセルロースであることを特徴とする請求項1に記載のセルロース分散液。
- 前記微細酸化セルロースが、カルボキシル基を有し、前記カルボキシル基量が、1.0mmol/g以上2.0mmol/g以下であることを特徴とする請求項2に記載のセルロース分散液。
- 前記体積基準粒度分布が、0.01μm以上1μm以下の体積基準粒径の範囲に1または2以上の粒径ピークを有し、且つ1μm以上100μm以下の体積基準粒径の範囲に1または2以上の粒径ピークを有することを特徴とする請求項3に記載のセルロース分散液。
- 前記セルロース分散液の分散媒が、水、メタノール、エタノールおよびイソプロピルアルコールから選択される1種または2種以上の溶媒であることを特徴とする請求項4に記載のセルロース分散液。
- 請求項5に記載のセルロース分散液から形成されることを特徴とする成形体。
- 請求項5に記載のセルロース分散液を基材上に塗布し乾燥させて形成されることを特徴とする成形体。
- 少なくとも微細酸化セルロースを含むセルロース分散液の製造方法であって、
セルロースを酸化して酸化セルロースを調製する工程と、
前記酸化セルロースを分散媒に分散させ、前記酸化セルロースを微細化して、体積基準粒度分布が0.01μm以上100μm以下の体積基準粒径の範囲にあり、且つ2以上の粒径ピークを有する微細酸化セルロースを含むセルロース分散液を調製する工程と
を具備することを特徴とするセルロース分散液の製造方法。 - 前記酸化セルロースを微細化する手段が、超音波ホモジナイザーであることを特徴とする請求項8に記載のセルロース分散液の製造方法。
- 前記セルロース分散液を調製する工程において、前記酸化セルロースを微細化して、体積基準粒度分布が0.01μm以上100μm以下の体積基準粒径の範囲にあり、且つ2以上の粒径ピークを有する微細酸化セルロースを含む2種以上の分散液を調整し、前記2種以上の分散液を混和してセルロース分散液を調製することを特徴とする請求項8に記載のセルロース分散液の製造方法。
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KR20130016227A (ko) | 2013-02-14 |
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