WO2011068023A1 - セルロースナノファイバー - Google Patents
セルロースナノファイバー Download PDFInfo
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- WO2011068023A1 WO2011068023A1 PCT/JP2010/070224 JP2010070224W WO2011068023A1 WO 2011068023 A1 WO2011068023 A1 WO 2011068023A1 JP 2010070224 W JP2010070224 W JP 2010070224W WO 2011068023 A1 WO2011068023 A1 WO 2011068023A1
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- WIPO (PCT)
- Prior art keywords
- sheet
- cellulose
- cellulose nanofiber
- cellulose nanofibers
- pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/34—Other mills or refiners
-
- 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
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
Definitions
- the present invention relates to a cellulose nanofiber.
- Cellulose nanofibers are the basic skeletal substances (basic elements) of all plants, and in the cell wall of plants, cellulose nanofibers consisting of several bundles of cellulose microfibrils (single cellulose nanofibers) with a width of about 4 nm. Exist as.
- cellulose fiber-containing materials such as pulp are defibrated and refined by grinding and beating with refiners, grinders (stone mills), twin-screw kneaders (double-screw extruder), high-pressure homogenizers, etc. Manufactured.
- the pulp when pulp is defibrated, the pulp is usually subjected to defibration in the presence of water. After defibration, the drainage time for separating water and the obtained cellulose nanofibers becomes longer as the aspect ratio of the cellulose nanofibers becomes larger. That is, when trying to obtain a cellulose nanofiber sheet or resin composite with high strength, it is desirable to fibrillate the cellulose nanofiber with a high aspect ratio, but when the fiber diameter is small and the aspect ratio is large, The time becomes longer, which causes an increase in cost industrially.
- Patent Document 2 discloses a method of defibrating pulp using a grinder or a twin screw extruder.
- the fiber strength is generally reduced and the aspect ratio is increased, so that the sheet strength can be expressed.
- the drainage time becomes very long, which is not preferable industrially.
- defibration with a twin screw extruder is usually performed at a rotational speed of 200 to 400 rpm (since the screw diameter is 15 mm, the peripheral speed is 9.4 m / min to 18.8 m / min).
- Defibration is performed for 60 minutes at 400 rpm (circumferential speed 18.8 m / min).
- Patent Document 3 the pulp preliminarily defibrated by a refiner is defibrated using a twin-screw extruder under a screw rotation speed of 300 rpm (the screw diameter is 15 mm, and the peripheral speed is 14.1 m / min). It is fiberized.
- the pulp does not have a high shear rate, and the cutting proceeds preferentially over the fiber defibration, so microfibrillation (fiber nano-ization) becomes insufficient. It is difficult to obtain nanofibers with high sheet strength.
- the main issue is to provide a novel method for producing cellulose nanofibers and novel cellulose nanofibers.
- the present inventor when producing cellulose nanofibers by pulverizing pulp with a uniaxial or multiaxial kneader in the presence of water, the kneader The peripheral speed of the screw is 45 m / min or higher, and the pulp is defibrated under a very high shear rate, which is not assumed in the prior art. It was found that cellulose nanofibers excellent in both points can be obtained. That is, the present invention provides a method for producing cellulose nanofibers, cellulose nanofibers, a sheet comprising the fibers, and a composite of the fibers and a resin according to items 1 to 7 below.
- Item 1 A method for producing cellulose nanofibers by pulverizing pulp with a uniaxial or multiaxial kneader in the presence of water, wherein the peripheral speed of the screw of the uniaxial or multiaxial kneader is 45 m / min or more. Fiber manufacturing method.
- Item 2 The production method according to Item 1, wherein the uniaxial or multiaxial kneader is a biaxial kneader.
- Item 4 The cellulose nanofibers obtained by the production method of Item 1 or 2, wherein 600 mL of a slurry in which the concentration of cellulose nanofibers in the mixture of cellulose nanofibers and water is 0.33% by weight is as follows: (1) 20 ° C (2) Filtration area 200cm 3 (3) -30 kPa degree of vacuum (4) Filtration time X (seconds) until a dehydrated sheet is obtained by filtration through a filter paper having a mesh size of 7 ⁇ m and a thickness of 0.2 mm; Tensile strength Y (MPa) of a dry sheet of 100 g / m 2 obtained by heating and compressing the dehydrated sheet at a temperature of 110 ° C. and a pressure of 0.003 MPa for 10 minutes. With the following formula (1): Y> 0.1339X + 58.299 (1) Satisfies cellulose nanofiber.
- Item 5 600 mL of slurry in which the concentration of cellulose nanofibers in the mixture of cellulose nanofibers and water is 0.33% by weight is as follows: (1) 20 ° C (2) Filtration area 200cm 3 (3) -30 kPa degree of vacuum (4) Filtration time X (seconds) until a dehydrated sheet is obtained by filtration through a filter paper having a mesh size of 7 ⁇ m and a thickness of 0.2 mm; Tensile strength Y (MPa) of a dry sheet of 100 g / m 2 obtained by heating and compressing the dehydrated sheet at a temperature of 110 ° C. and a pressure of 0.003 MPa for 10 minutes. With the following formula (1): Y> 0.1339X + 58.299 (1) Satisfies cellulose nanofiber.
- Item 6. A sheet comprising the cellulose nanofiber according to any one of Items 3 to 5.
- Item 7. A resin composite containing the cellulose nanofiber according to any one of Items 3 to 5.
- the method for producing cellulose nanofibers of the present invention is to produce cellulose nanofibers by pulverizing pulp with a uniaxial or multiaxial kneader in the presence of water. It is characterized by performing defibration in minutes or more.
- pulp used for defibration includes kraft pulp, sulfite pulp, soda pulp, carbonated soda pulp and other chemical pulp, mechanical pulp, chemi-ground pulp, recycled pulp regenerated from waste paper, etc. Can be used. These pulps can be used alone or in combination of two or more. Among these pulps, kraft pulp is particularly preferable from the viewpoint of strength.
- pulp materials include wood-based cellulose materials such as coniferous chips, hardwood chips, sawdust, and non-wood-based cellulose materials (for example, annual plants such as bagasse, kenaf, straw, reed, and esparto).
- wood-based cellulose materials particularly softwood chips and hardwood chips are preferred.
- the most preferred raw material pulp is softwood unbleached kraft pulp (NUKP), softwood bleached kraft pulp (NBKP).
- cellulose nanofibers are produced by defibrating the raw pulp with a uniaxial or multiaxial kneader (hereinafter sometimes simply referred to as “kneader”).
- the kneading machine includes a uniaxial kneader and a biaxial or more multi-axial kneader, and any of them may be used in the present invention.
- the use of a multiaxial kneader is preferable because the dispersibility of the raw material pulp and the degree of nanofiber formation can be further improved.
- a biaxial kneader is preferable from the viewpoint of availability.
- the lower limit value of the peripheral speed of the screw of the uniaxial or multiaxial kneader is about 45 m / min.
- the lower limit of the peripheral speed of the screw is preferably about 60 m / min, and particularly preferably about 90 m / min.
- the upper limit value of the peripheral speed of the screw is usually about 200 m / min.
- the upper limit of the peripheral speed of the screw is preferably about 150 m / min, particularly preferably about 100 m / min.
- the fiber surface can be fibrillated (nanoized) under a higher shear rate than before, and the drainage time is short, but high. Sheet strength can be expressed.
- the peripheral speed of the screw of the kneader is usually about 10 m / min to 20 m / min.
- the shear rate acting on the cellulose is lowered, and the cutting proceeds preferentially over the fiber defibration, so that the fibrillation is not sufficiently performed and the sheet strength is high. It will become the cellulose nanofiber which does not express.
- L / D (ratio of screw diameter D to kneading part length L) of the kneader used in the present invention is usually about 15 to 60, preferably about 30 to 60.
- the defibration time in the uniaxial or multiaxial kneader varies depending on the type of raw pulp, the L / D of the kneader, etc., but usually within the range of the L / D, about 30 to 60 minutes, preferably Is about 30 to 45 minutes.
- the number of passes (passes) at which the pulp is subjected to defibration by the kneader varies depending on the fiber diameter and fiber length of the target cellulose nanofiber, and the L / D of the kneader, but usually 1 to 8 times. About, preferably about 1 to 4 times. If the pulp is subjected to defibration by the kneader too much (pass), the defibration progresses more, but at the same time, heat is generated, so that the cellulose is colored, resulting in heat damage (decrease in sheet strength). Connected.
- the kneader there may be one kneading part where the screw is present, or two or more kneading parts.
- the peripheral speed of the screw is 45 m / min or more, which is considerably higher than the peripheral speed of the conventional screw. Therefore, in order to reduce the load on the kneader, it is more preferable not to have a damming structure. .
- Rotation direction of the two screws constituting the biaxial kneader may be different or the same direction.
- the meshing of the two screws constituting the twin-screw kneader includes a complete meshing type, an incomplete meshing type, and a non-meshing type, but as the one used for defibration of the present invention, the complete meshing type is preferable.
- the ratio of screw length to screw diameter may be about 20 to 150.
- Specific examples of the twin-screw kneader include “KZW” manufactured by Technobel, “TEX” manufactured by Nippon Steel Works, “TEM” manufactured by Toshiba Machine, and “ZSK” manufactured by Coperion.
- the ratio of the raw pulp in the mixture of raw pulp and water used for defibration is usually about 10 to 70% by weight, preferably about 20 to 50% by weight.
- the temperature at the time of kneading is not particularly limited, but it can usually be carried out at 10 to 160 ° C., and a particularly preferable temperature is 20 to 140 ° C.
- the raw pulp may be subjected to preliminary defibration using a refiner or the like before the raw pulp is subjected to defibration using a kneader.
- a method of preliminary defibration using a refiner or the like a conventionally known method can be adopted, for example, a method described in Patent Document 3 can be adopted.
- the load applied to the kneader can be reduced, which is preferable from the viewpoint of production efficiency.
- Cellulose nanofiber The cellulose nanofiber of the present invention is characterized by having the following properties.
- 600 mL of slurry in which the concentration of cellulose nanofibers in the mixture of cellulose nanofibers and water is 0.33% by weight is as follows: (1) 20 ° C (2) Filtration area 200cm 3 (3) -30 kPa degree of vacuum (4) Filtration time X (seconds) until a dehydrated sheet is obtained by filtration through a filter paper having a mesh size of 7 ⁇ m and a thickness of 0.2 mm; Tensile strength Y (MPa) of a dry sheet of 100 g / m 2 obtained by heating and compressing the dehydrated sheet at a temperature of 110 ° C. and a pressure of 0.003 MPa for 10 minutes. With the following formula (1): Y> 0.1339X + 58.299 (1) Meet.
- the straight line between the straight lines of the general formulas (1a) and (1b) is the straight line of the general formula (1c), and the region above this is the relational expression represented by the general formula (1).
- the straight line of the general formula (1c) in FIG. 1 when the drainage time is 200 seconds, the tensile strength exceeds 80 MPa.
- the tensile strength exceeds 80 MPa.
- the straight line of the general formula (1a) in FIG. I know you need to do that.
- the drainage time for obtaining a sheet having the same strength is increased by 1.5 times, it is extremely disadvantageous when the sheet is produced on an industrial large scale.
- the upper limit of drainage time X (seconds) varies depending on the intended sheet strength, but is usually about 10 to 2000 seconds, preferably about 10 to 200 seconds, from the viewpoint of industrial use.
- the upper limit of the tensile strength Y (MPa) of the sheet varies depending on the type of pulp and the like, but is generally about 20 to 200 MPa, preferably about 50 to 200 MPa. For example, in the case of kraft pulp, it is about 50 to 200 MPa, preferably about 80 to 200 MPa.
- the filtering time refers to a time when 600 mL of a slurry of 0.33% by weight cellulose nanofiber and water is subjected to vacuum suction filtration under the above conditions (1) to (4) until a dehydrated sheet is obtained.
- the dehydrated sheet refers to a sheet in which almost no water droplets are generated from the cellulose nanofiber sheet formed by suction filtration.
- the dewatered sheet is not sufficiently formed and water remains, the sheet appears to shine due to light reflection. Since the reflection of light disappears when the dehydrated sheet is formed, it can be determined that the dehydrated sheet is obtained. It should be noted that water droplets hardly occur after the formation of the dewatering sheet, but some water droplets contained in the dewatering sheet may occur.
- the water content in the dewatering sheet after draining is preferably low from the viewpoint of reducing the drying load.
- the drainage time is obtained by performing the measurement several times and calculating the average value.
- no slurry is sucked, so that air is sucked.
- air since air sucks in, it can be confirmed that a dehydrated sheet is formed by the sucking in.
- the fiber diameter (width) of the cellulose nanofiber is small.
- the cellulose nanofibers of the present invention are a mixture of cellulose nanofibers having a small fiber diameter (about 15 to 20 nm) and cellulose nanofibers having a relatively large fiber diameter (about 300 to 1000 nm) (see FIG. 2).
- the damage of the cellulose nanofiber surface by defibration is small, and the aspect ratio of a cellulose nanofiber is also large. Therefore, the cellulose nanofibers of the present invention have the characteristics of cellulose nanofibers that are unprecedented in that the strength is high despite the short drainage time.
- the cellulose nanofiber of the present invention also includes a part of fibers of about 1 to 10 ⁇ m. This is also an excellent point of the present invention that the drainage time is short in spite of high strength. It is thought that it contributes to.
- the cellulose nanofiber of the present invention may include a fiber fibrillated to a cellulose microfibril (single cellulose nanofiber) having a width of about 4 nm.
- the cellulose nanofiber of the present invention satisfying the relational expression (1) can be produced by defibrating pulp by the production method of the present invention.
- the fiber diameter of the cellulose nanofiber of the present invention has an average value of about 4 to 400 nm, preferably about 4 to 200 nm, and particularly preferably about 4 to 100 nm.
- the fiber length has an average value of about 50 nm to 50 ⁇ m, preferably about 100 nm to 10 ⁇ m.
- the average value of the fiber diameter and fiber length of the cellulose nanofiber of the present invention is an average value when measured for 100 cellulose nanofibers in the field of view of an electron microscope.
- the cellulose nanofiber of the present invention can be formed into a molded body formed into a sheet shape.
- the molding method is not particularly limited.
- the cellulose nanofibers (slurry) of cellulose nanofibers and water obtained by the above-mentioned defibration are filtered by suction, and the cellulose nanofibers in sheet form on the filter are dried and heated.
- Cellulose nanofibers can be formed into a sheet by compression or the like.
- the concentration of cellulose nanofiber in the slurry is not particularly limited. Usually, it is about 0.1 to 2.0% by weight, preferably about 0.2 to 0.5% by weight.
- the degree of vacuum of suction filtration is usually about 10 to 60 kPa, preferably about 10 to 30 kPa.
- the temperature during suction filtration is usually about 10 ° C to 40 ° C, preferably about 20 ° C to 25 ° C.
- Wire mesh cloth, filter paper, etc. can be used as the filter.
- the mesh size of the filter is not particularly limited as long as the cellulose nanofibers after defibration can be filtered, but when a wire mesh cloth is used, those having a size of about 1 ⁇ m to 100 ⁇ m can be used. When filter paper is used, those having a size of about 1 ⁇ m to 100 ⁇ m can be used.
- a cellulose nanofiber dehydrated sheet (wet web) can be obtained by the above suction filtration. And the dried sheet
- the heating temperature at the time of heat compression is usually about 50 to 150 ° C., preferably about 90 to 120 ° C.
- the pressure is usually about 0.0001 to 0.05 MPa, preferably about 0.001 to 0.01 MPa.
- the heat compression time is usually about 1 to 60 minutes, preferably about 10 to 30 minutes.
- the tensile strength of the sheet obtained from the cellulose nanofiber of the present invention may vary depending on the basis weight, density, etc. of the sheet.
- a sheet having a basis weight of 100 g / m 2 was prepared, and the tensile strength of the cellulose nanofiber sheet obtained from the cellulose nanofiber having a density of 0.8 to 1.0 g / cm 3 was measured.
- the tensile strength is a value measured by the following method.
- a dry cellulose nanofiber sheet prepared to have a basis weight of 100 g / m 2 is cut to produce a 10 mm ⁇ 50 mm rectangular sheet to obtain a test piece.
- the test piece is attached to a tensile tester, and the stress and strain applied to the test piece are measured while applying a load.
- the load applied per unit area of the test piece when the test piece breaks is defined as the tensile strength.
- Resin Composite The cellulose nanofiber of the present invention can be mixed with various resins to form a resin composite.
- the type of resin is not particularly limited.
- Resin can be used individually by 1 type or in combination of 2 or more types.
- biodegradable resins such as polylactic acid and polybutylene succinate; polyolefin resins such as polyethylene and polypropylene; phenol resins; epoxy resins; unsaturated polyester resins.
- biodegradable resins examples include L-lactic acid, D-lactic acid, DL-lactic acid, glycolic acid, malic acid, succinic acid, ⁇ -caprolactone, N-methylpyrrolidone, trimethylene carbonate, paradioxanone, 1,5- Examples thereof include homopolymers such as dioxepan-2-one, hydroxybutyric acid, and hydroxyvaleric acid, copolymers, and mixtures of these polymers. These can be used singly or in combination of two or more.
- Preferred biodegradable resins are polylactic acid, polybutylene succinate, and polycaprolactone, and more preferred are polylactic acid and polybutylene succinate.
- the method of combining cellulose nanofibers and resin is not particularly limited, and a method of combining ordinary cellulose nanofibers with resin can be employed.
- a method of sufficiently impregnating a resin monomer liquid into a sheet or molded body composed of cellulose nanofibers and polymerizing with heat, UV irradiation, a polymerization initiator, etc., a polymer resin solution or a resin powder dispersion on cellulose nanofibers A method in which cellulose nanofibers are sufficiently dispersed in a resin monomer solution and polymerized by heat, UV irradiation, a polymerization initiator, etc., cellulose nanofibers in a polymer resin solution or resin powder dispersion
- the content ratio of cellulose nanofibers in the composite is preferably about 10 to 90% by weight, more preferably about 10 to 50% by weight.
- additives such as a flow regulator, a leveling agent, a conductive agent, an antistatic agent, an ultraviolet absorber, an ultraviolet dispersant, and a deodorant may be blended.
- the resin composite of the present invention can be produced.
- the cellulose nanofiber of the present invention although the drainage time is short, the strength is high, so in addition to the cost reduction in the manufacturing process when making the resin composite, a high strength resin composite is obtained. Can do.
- This composite resin can be molded in the same manner as other moldable resins. For example, it can be molded by heat compression by mold molding, extrusion molding, injection molding, or the like. The molding conditions may be applied by appropriately adjusting the molding conditions of the resin as necessary.
- the resin composite of the present invention has high mechanical strength, for example, in addition to the fields where conventional cellulose nanofiber molded products and cellulose nanofiber-containing resin molded products have been used, higher mechanical strength ( It can also be used in fields where tensile strength is required.
- interior materials, exterior materials, structural materials, etc. for transportation equipment such as automobiles, trains, ships, airplanes, etc .
- housings, structural materials, internal parts, etc. for electrical appliances such as personal computers, televisions, telephones, watches, etc .
- mobile phones, etc. Housing, structural materials, internal parts, etc. for mobile communication equipment; portable music playback equipment, video playback equipment, printing equipment, copying equipment, housing for sports equipment, etc .; construction materials, office equipment such as stationery It can be used effectively as such.
- the peripheral speed of the screw of the kneader is 45 m / min or more.
- Electron micrograph of the cellulose nanofiber obtained in Example 1 Electron micrograph of cellulose nanofibers obtained by refiner treatment Electron micrograph of commercially available cellulose nanofiber (Serisch: manufactured by Daicel Chemical Industries) Electron micrograph of cellulose nanofiber obtained in Comparative Example 3
- Example 1 A slurry of unbleached kraft pulp (NUKP) of conifers (water suspension with a pulp slurry concentration of 2% by weight) is passed through a single disc refiner (manufactured by Kumagai Riki Kogyo Co., Ltd.), and the Canadian standard freeness (CSF) value becomes 100 mL or less. Until then, the refiner treatment was repeated. Next, the obtained slurry was drained using a centrifugal dehydrator (manufactured by Kokusan Co., Ltd.) under the conditions of 2000 rpm and 15 minutes, and the pulp concentration was concentrated to 25% by weight. The obtained hydrous pulp was put into a twin-screw kneader (KZW manufactured by Technobel), and defibrated. The defibrating conditions by the biaxial kneader are as follows.
- Filtration area about 200 cm 2
- Decompression degree -30 kPa
- Filter paper 5A filter paper manufactured by Advantech Toyo Co., Ltd.
- Filtration amount 600 mL of slurry having a cellulose nanofiber concentration of 0.33% by weight.
- the time from the start of vacuum filtration to the formation of a dehydrated sheet was defined as the filtrate time Y (seconds).
- the obtained wet web was heated and compressed at 110 ° C. and a pressure of 0.003 MPa for 10 minutes to prepare a dry sheet of 100 g / m 2 .
- the tensile strength of the obtained dry sheet was measured.
- Table 1 shows the physical property values of the obtained dry sheet. Note that when the moisture remains, the dry sheet appears to shine due to light reflection. On the other hand, when the dehydrated sheet is obtained, the reflection of the light disappears. Therefore, the time when the reflection of the light disappears was set as the filtering time.
- the drainage time is obtained by performing the measurement several times and calculating an average value thereof.
- the method for measuring the tensile strength is as described above.
- Example 2 A sheet was produced in the same manner as in Example 1 except that the number of times of defibration treatment was changed to 4 times (4 passes). The physical properties of the obtained sheet are shown in Table 1.
- Example 3 A sheet was prepared in the same manner as in Example 1 except that the pulp subjected to the defibrating treatment was softwood bleached kraft pulp (NBKP) instead of softwood unbleached kraft pulp (NUKP). Table 1 shows physical property values of the obtained sheet.
- NNKP softwood bleached kraft pulp
- NUKP softwood unbleached kraft pulp
- Example 4 A sheet was produced in the same manner as in Example 3 except that the number of times of defibration treatment was changed to 4 times (4 passes). Table 1 shows physical property values of the obtained sheet.
- Comparative Example 1 A sheet was produced in the same manner as in Example 1 except that the peripheral speed of the screw was changed to 18.8 m / min instead of 94.2 m / min. The physical properties of the obtained sheet are shown in Table 1.
- Comparative Example 2 A sheet was produced in the same manner as in Comparative Example 1 except that the number of damming structures was changed to one instead of zero. The physical properties of the obtained sheet are shown in Table 1.
- Comparative Example 3 A sheet was produced in the same manner as in Comparative Example 1 except that the number of damming structures was changed to 2 instead of 0. The physical properties of the obtained sheet are shown in Table 1.
- Comparative Example 4 Softwood unbleached kraft pulp (NUKP) and water were mixed and sufficiently stirred to adjust the pulp concentration to 2% by weight.
- the obtained suspension is put into a single disc refiner, beaten so that Canadian Standard Freeness (CSF) becomes 50 mL, water is added to the obtained slurry, and the concentration of cellulose nanofiber is adjusted to 0.33% by weight. did. Thereafter, a sheet was produced in the same manner as in Example 1.
- the physical properties of the obtained sheet are shown in Table 1.
- Comparative Example 5 A sheet was produced in the same manner as in Comparative Example 4 except that serisch manufactured by Daicel Chemical Industries, Ltd. (pulp concentration: 10%) was used. The physical properties of the obtained sheet are shown in Table 1.
- Example 5 Cellulose nanofiber slurry was obtained from an aqueous suspension of softwood unbleached kraft pulp (NUKP) under the same defibrating conditions as in Example 2. The obtained slurry was filtered to obtain a cellulose nanofiber sheet. The filtration conditions were filtration area: about 200 cm 2 , degree of vacuum: ⁇ 30 kPa, filter paper: 5A manufactured by Advantech Toyo Co., Ltd. Next, the obtained sheet was cut into a width of 30 mm and a length of 40 mm, dried at 105 ° C. for 2 hours, and the weight was measured.
- NUKP softwood unbleached kraft pulp
- the sheet is immersed in a resin solution obtained by adding 1 part by weight of benzoyl peroxide (“NIPER FF” manufactured by NOF Corporation) to 100 parts by weight of unsaturated polyester resin (“SANDMER FG283” manufactured by DH Material Co., Ltd.). I let you. Immersion was carried out under reduced pressure (degree of vacuum 0.01 MPa, time 30 minutes) to obtain an unsaturated polyester resin-impregnated sheet. Next, 12 sheets of the same unsaturated polyester resin impregnated sheet were stacked. After excess resin was expelled, it was put in a mold and subjected to overheating press (temperature: 90 ° C., time: 30 minutes) to obtain a molded article of cellulose nanofiber unsaturated polyester composite. The weight of the obtained molded product was measured, and the fiber content (% by weight) was calculated from the difference from the dry weight of the sheet.
- NIPER FF benzoyl peroxide
- SANDMER FG283 unsaturated polyester resin
- the length and width of the molded product were accurately measured with calipers (manufactured by Mitutoyo Corporation). The thickness was measured with several micrometers (manufactured by Mitutoyo Corporation), and the volume of the molded product was calculated. Separately, the weight of the molded product was measured. The density was calculated from the obtained weight and volume.
- a sample having a thickness of 1.2 mm, a width of 7 mm, and a length of 40 mm was prepared from the molded product, and the bending elastic modulus and bending strength were measured at a deformation rate of 5 mm / min (load cell 5 kN).
- a universal material testing machine Instron 3365 type (Instron Japan Company Limited) was used as a measuring machine.
- Table 2 shows the fiber content, density, and bending strength of the resin composite obtained in Example 5.
- Comparative Example 6 A cellulose nanofiber slurry was obtained from an aqueous suspension of softwood unbleached kraft pulp (NUKP) under the same defibrating conditions as in Comparative Example 3. A molded product of a composite of unsaturated polyester and cellulose nanofiber was produced from the resulting slurry in the same manner as in Example 5. Table 2 shows the fiber content, density, and bending strength of the molded product of the resin composite obtained in Comparative Example 6.
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Abstract
Description
(1)20℃
(2)ろ過面積200cm3
(3)-30kPa減圧度
(4)メッシュサイズ7μm、厚み0.2mmのろ紙
でろ過して脱水シートが得られるまでのろ水時間X(秒)と、
該脱水シートを温度110℃、圧力0.003MPaで10分間、加熱圧縮して得られる100g/m2の乾燥シートの引っ張り強度Y(MPa)
との関係が、下式(1):
Y>0.1339X+58.299 (1)
を満たすセルロースナノファイバー。
(1)20℃
(2)ろ過面積200cm3
(3)-30kPa減圧度
(4)メッシュサイズ7μm、厚み0.2mmのろ紙
でろ過して脱水シートが得られるまでのろ水時間X(秒)と、
該脱水シートを温度110℃、圧力0.003MPaで10分間、加熱圧縮して得られる100g/m2の乾燥シートの引っ張り強度Y(MPa)
との関係が、下式(1):
Y>0.1339X+58.299 (1)
を満たすセルロースナノファイバー。
本発明のセルロースナノファイバーの製造方法は、水の存在下、パルプを一軸又は多軸混練機で解繊してセルロースナノファイバーを製造するに際して、該混練機のスクリューの周速を45m/分以上にして解繊を行うことを特徴とする。
本発明において、解繊に供されるパルプとしては、クラフトパルプ、サルファイトパルプ、ソーダパルプ、炭酸ソーダパルプなどの化学パルプ、機械パルプ、ケミグランドパルプ、古紙から再生された再生パルプなどが使用できる。これらのパルプは1種単独で又は2種以上混合して使用することができる。これらのパルプの中でも、強度の点から、クラフトパルプが特に好ましい。
本発明においては、前記原料パルプを一軸又は多軸混練機(以下、単に「混練機」ということがある)で解繊してセルロースナノファイバーを製造する。混練機(混練押出機)には、一軸混練機、二軸以上の多軸混練機があり、本発明においては、何れを使用してもよい。多軸混練機を用いた場合、原料パルプの分散性、ナノファイバー化の程度をより向上させることができるので好ましい。多軸混練機の中でも、入手のしやすさ等の観点から、二軸混練機が好ましい。
本発明のセルロースナノファイバーは、以下の特性を有することを特徴とする。
(1)20℃
(2)ろ過面積200cm3
(3)-30kPa減圧度
(4)メッシュサイズ7μm、厚み0.2mmのろ紙でろ過して脱水シートが得られるまでのろ水時間X(秒)と、
該脱水シートを温度110℃、圧力0.003MPaで10分間、加熱圧縮して得られる100g/m2の乾燥シートの引っ張り強度Y(MPa)
との関係が、下式(1):
Y>0.1339X+58.299 (1)
を満たす。
Y=0.1339X+58.299 (1c)
で表される直線よりもYの値が大きい範囲にあることを特徴とする。
Y=0.1339X + 47.871 (1a)
Y=0.1339X + 68.727 (1b)
前記の通り、本発明のセルロースナノファイバーは、シート状に成形した成形体とすることができる。成形方法は特に限定されないが、例えば、前記の解繊によって得られたセルロースナノファイバーと水との混合液(スラリー)を吸引ろ過し、フィルター上にシート状になったセルロースナノファイバーを乾燥、加熱圧縮等することによって、セルロースナノファイバーをシートに成形することができる。
本発明のセルロースナノファイバーは、種々の樹脂と混合して樹脂複合体とすることができる。
針葉樹未漂白クラフトパルプ(NUKP)のスラリー(パルプスラリー濃度2重量%の水懸濁液)をシングルディスクリファイナー(熊谷理機工業製)に通液させ、カナディアンスタンダードフリーネス(CSF)値が100mL以下になるまで、繰返しリファイナー処理を行った。次に、得られたスラリーを遠心脱水機(株式会社コクサン製)を用いて2000rpm、15分の条件で脱液し、パルプ濃度を25重量%にまで濃縮した。得られた含水パルプを二軸混練機(テクノベル社製のKZW)に投入し、解繊処理を行った。二軸混練機による解繊条件は以下の通りである。
スクリュー直径15mm
スクリュー回転数:2000rpm(スクリュー周速:94.2m/分)
解繊時間:150gの針葉樹未漂白クラフトパルプを500g/hr~600g/hrの処理条件で解繊した。原料を投入してからセルロースナノファイバーが得られる迄の時間は15分であった。
解繊処理に供した回数:1回(1パス)
せき止め構造:0個。
ろ過面積:約200cm2
減圧度:-30kPa
ろ紙:アドバンテック東洋株式会社製の5Aろ紙
ろ過量:セルロースナノファイバー濃度0.33重量%のスラリー600mL。
解繊処理に供した回数を4回(4パス)とした以外は、実施例1と同様にして、シートを作製した。得られたシートの物性値を表1に示す。
解繊処理に供したパルプを針葉樹未漂白クラフトパルプ(NUKP)の代わりに針葉樹漂白クラフトパルプ(NBKP)とした以外は、実施例1と同様にして、シートを作製した。得られたシートの各物性値を表1に示す。
解繊処理に供した回数を4回(4パス)とした以外は、実施例3と同様にして、シートを作製した。得られたシートの各物性値を表1に示す。
スクリューの周速を94.2m/分とする代わりに18.8m/分とした以外は、実施例1と同様にして、シートを作製した。得られたシートの物性値を表1に示す。
せき止め構造を0個の代わりに1個とした以外は、比較例1と同様にして、シートを作製した。得られたシートの物性値を表1に示す。
せき止め構造を0個の代わりに2個とした以外は、比較例1と同様にして、シートを作製した。得られたシートの物性値を表1に示す。
針葉樹未漂白クラフトパルプ(NUKP)と水を混合し、十分に攪拌して、パルプ濃度を2重量%に調製した。得られた懸濁液をシングルディスクリファイナーに投入し、カナディアンスタンダードフリーネス(CSF)が50mLになるように叩解し、得られたスラリーに水を加え、セルロースナノファイバーの濃度を0.33重量%に調製した。その後は実施例1と同様にして、シートを作製した。得られたシートの物性値を表1に示す。
ダイセル化学工業社製セリッシュ(パルプ濃度10%)を用いた以外は比較例4と同様にしてシートを作製した。得られたシートの物性値を表1に示す。
実施例2と同じ解繊条件で針葉樹未漂白クラフトパルプ(NUKP)の水懸濁液からセルロールナノファイバーのスラリーを得た。得られたスラリーをろ過してセルロースナノファイバーのシートを得た。なお、ろ過条件は、ろ過面積:約200cm2、減圧度:-30kPa、ろ紙:アドバンテック東洋株式会社製の5Aとした。次に、得られたシートを幅30mm×長さ40mmにカットして105℃で2時間乾燥させ、重量を測定した。さらに、不飽和ポリエステル樹脂(ディーエイチ・マテリアル株式会社製「サンドマーFG283」)100重量部にベンゾイルパーオキサイド(日油株式会社製「ナイパーFF」)1重量部を加えた樹脂液に該シートを浸漬させた。浸漬は減圧下(真空度0.01MPa、時間30分)で行い、不飽和ポリエステル樹脂含浸シートを得た。次に、該不飽和ポリエステル樹脂含浸シートを、それぞれ同じものを12枚重ねた。余分な樹脂をはき出した後、金型に入れ、過熱プレス(温度:90℃、時間:30分)を行って、セルロースナノファイバー不飽和ポリエステル複合体の成形物を得た。なお、得られた成形物の重量を測定し、前記シートの乾燥重量との差から繊維含有率(重量%)を算出した。
比較例3と同じ解繊条件で針葉樹未漂白クラフトパルプ(NUKP)の水懸濁液からセルロールナノファイバーのスラリーを得た。得られたスラリーから、実施例5と同様にして不飽和ポリエステルとセルロールナノファイバーとの複合体の成形物を作製した。比較例6で得られた樹脂複合体の成形物の繊維含有率、密度及び曲げ強度を表2に示す。
Claims (7)
- 水の存在下、パルプを一軸又は多軸混練機で解繊してセルロースナノファイバーを製造する方法であって、前記一軸又は多軸混練機のスクリューの周速が45m/分以上であるセルロースナノファイバーの製造方法。
- 前記一軸又は多軸混練機が二軸混練機である請求項1に記載の製造方法。
- 請求項1又は2の製造方法によって得られるセルロースナノファイバー。
- 請求項1又は2の製造方法によって得られるセルロースナノファイバーであって、該セルロースナノファイバーと水との混合物中のセルロースナノファイバーの濃度が0.33重量%であるスラリー600mLを下記条件:
(1)20℃
(2)ろ過面積200cm3
(3)-30kPa減圧度
(4)メッシュサイズ7μm、厚み0.2mmのろ紙
でろ過して脱水シートが得られるまでのろ水時間X(秒)と、
該脱水シートを温度110℃、圧力0.003MPaで10分間、加熱圧縮して得られる100g/m2の乾燥シートの引っ張り強度Y(MPa)
との関係が、下式(1):
Y>0.1339X+58.299 (1)
を満たすセルロースナノファイバー。 - セルロースナノファイバーと水との混合物中のセルロースナノファイバーの濃度が0.33重量%であるスラリー600mLを下記条件:
(1)20℃
(2)ろ過面積200cm3
(3)-30kPa減圧度
(4)メッシュサイズ7μm、厚み0.2mmのろ紙
でろ過して脱水シートが得られるまでのろ水時間X(秒)と、
該脱水シートを温度110℃、圧力0.003MPaで10分間、加熱圧縮して得られる100g/m2の乾燥シートの引っ張り強度Y(MPa)
との関係が、下式(1):
Y>0.1339X+58.299 (1)
を満たすセルロースナノファイバー。 - 請求項3~5のいずれかに記載のセルロースナノファイバーからなるシート。
- 請求項3~5のいずれかに記載のセルロースナノファイバーを含有する樹脂複合体。
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EP2508671B8 (en) | 2015-04-08 |
EP2508671A4 (en) | 2013-05-22 |
CA2782485C (en) | 2017-10-24 |
EP2508671A1 (en) | 2012-10-10 |
US8974634B2 (en) | 2015-03-10 |
EP2508671B1 (en) | 2014-07-16 |
CN102656316A (zh) | 2012-09-05 |
US20120277351A1 (en) | 2012-11-01 |
JPWO2011068023A1 (ja) | 2013-04-18 |
CN102656316B (zh) | 2015-04-15 |
JP5638001B2 (ja) | 2014-12-10 |
CA2782485A1 (en) | 2011-06-09 |
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