WO2007136086A1 - ポリ乳酸とセルロース繊維とを含有する材料 - Google Patents
ポリ乳酸とセルロース繊維とを含有する材料 Download PDFInfo
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- WO2007136086A1 WO2007136086A1 PCT/JP2007/060503 JP2007060503W WO2007136086A1 WO 2007136086 A1 WO2007136086 A1 WO 2007136086A1 JP 2007060503 W JP2007060503 W JP 2007060503W WO 2007136086 A1 WO2007136086 A1 WO 2007136086A1
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- polylactic acid
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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
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- 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
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- 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 present invention relates to a polylactic acid resin composition and a molded product thereof. More specifically, the present invention relates to a method for modifying a polylactic acid resin using cellulose nanofibers obtained by subjecting cellulose to an opposing collision treatment.
- Ultra-fine cellulose nanofibers with high strength, low thermal expansion coefficient, high heat resistance, width 50nm and thickness 10nm are produced by acetic acid bacteria, a kind of microorganism.
- the nanofibers produced from each cell form a three-dimensional network immediately and become a film-like material called a pellicle.
- the underwater facing collision treatment reported by the present inventors is a simple nano-fiber that cleaves only the interaction from the sample surface by applying a high pressure to the natural fiber sample in water and causing it to face and collide at high speed.
- This is a technique that enables miniaturization (Patent Document 1).
- the treatment itself is chemical-free and low energy.
- the network of the pellicles is first removed, and the bacterial cellulose (BC) nanofibers are dispersed in water.
- BC bacterial cellulose
- cellulose nanofibers nanocellulose
- bacterial cellulose (BC) nanofibers are being used to modify the substrate surface by coating the substrate surface with a cellulose nanofiber coating (Patent Document 2). .
- Patent Document 1 JP 2002-142796
- Patent Document 2 Japanese Patent Application No. 2006-25869
- Non-patent literature l Yano, H. and Nakahara, S .: J. Mater. Sci., 39, 1635 (2004)
- Non-patent literature 2 APMathew, K. Oksman, M. Sain, J Appl Polym Sci. 97 , 2014 (2005) Disclosure of invention
- Non-Patent Document 1 the material obtained by the former (Non-Patent Document 1) is considered to have low heat resistance. In the latter case (Non-Patent Document 2), sufficient mechanical strength is not obtained. This is thought to be because the interaction at the interface between cellulose fiber and PLA (polylactic acid) is not sufficient.
- Underwater collision-treated cellulose nanofibers studied by the present inventors are fibers having an improved specific surface area, which is another effect of the underwater collision, which is a small force of nano-size. is there. Therefore, Mikurofi Burirui spoon specific surface than cellulose has been used in former reports are presumed to 10 3 times higher.
- FIG. 1 is a graph showing an exothermic peak due to crystallization when held at 100 ° C.
- FIG. 2 is a graph showing an exothermic peak due to crystallization when kept at 120 ° C.
- FIG. 3 is a graph showing an exothermic peak due to crystallization when kept at 120 ° C.
- FIG. 4 is a polarizing micrograph showing the state of crystallization of a polylactic acid sample.
- FIG. 5 is a polarizing microscope photograph showing the crystallization of a polylactic acid sample to which cellulose nanofibers are added.
- the present invention relates to a degradable ⁇ composition comprising polylactic acid 75 wt% or more, 0.05 to 10% by weight relative to the polylactic acid (for example 0.1 to 5 weight 0/0, 0.5 to 2.5 weight 0/0) comprising cellulose nanofibers, provides ⁇ composition.
- Cellulose nanofibers are preferably obtained by opposing impact treatment of cellulose, and more preferably obtained by opposing impact treatment of nocteria cellulose! /.
- polylactic acid refers to a polymer containing repeating lactic acid units, and includes lactic acid homopolymers, lactic acid copolymers (for example, lactic acid-hydroxycarboxylic acid).
- Acid copolymer and a polymer blend or polymer alloy which is a mixture of lactic acid homopolymer and lactic acid copolymer.
- Polylactic acid can be produced using L-lactic acid, D-lactic acid, DL-lactic acid, lactide lactic acid, which is a cyclic dimer of lactic acid, or a mixture thereof as a raw material.
- the lactic acid copolymer includes the above-mentioned L-lactic acid and the like, hydroxycarboxylic acid, glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 5-hydroxyvaleric acid, 6-hydroxycarboxylic acid, It can be produced using a cyclic ester intermediate of hydroxycarboxylic acid (for example, glycolide, which is a dimer of glycolic acid, ⁇ -force prolatatone, which is a cyclic ester of 6-hydroxycarboxylic acid), and mixtures thereof. it can.
- a cyclic ester intermediate of hydroxycarboxylic acid for example, glycolide, which is a dimer of glycolic acid, ⁇ -force prolatatone, which is a cyclic ester of 6-hydroxycarboxylic acid
- the “polylactic acid” of the present invention is not particularly limited in the proportion, molecular structure, and molecular weight of polylactic acid used as long as it is biodegradable and can be molded.
- the weight average molecular weight of the resin component in the resin composition is 1 to 500,000, more preferably 30 to 400,000, and further preferably 5 to 30. Ten thousand. In the present invention, those having a weight average molecular weight of 130,000 can be suitably used.
- the polylactic acid having the molecular weight described above can be contained, for example, 75% by weight or more.
- a polylactic acid-containing ⁇ composition comprising only polylactic acid and cellulose nanofibers, 0.05 to 10% by weight relative to the polylactic acid (for example 0.1 to 5 weight 0/0, 0.5 to 2.5 weight 0/0) ⁇ composition comprising cellulose nanofibers are examples of the present invention.
- various additives such as those added to conventional rosin compositions may be added to the rosin composition of the present invention.
- a lactic acid homopolymer can be particularly preferably used as the polylactic acid.
- cellulose includes plant-derived cellulose, bacterial cellulose, animal-derived cellulose, cellulose fiber, crystalline cellulose and the like, which are not limited to origin, production method, properties, etc., except in special cases. .
- cellulose nanofiber refers to a cellulose fiber having an average width and an average thickness of 100 nm or less.
- the average width and average thickness of the cellulose fiber is light Measurements can be made by methods well known to those skilled in the art, such as scattering devices, laser microscopes, and electron microscopes.
- the average width is obtained by measuring several points, for example, 10 to 200 points, preferably 30 to 80 points, of the measured length, and taking the average value.
- the average thickness is obtained by measuring several points, for example, 10 to 200 points, preferably 30 to 80 points, of the measured length, and taking the average value.
- Preferred examples of the cellulose nanofibers used in the present invention have an average width and an average thickness equal to or less than that of nocteria cellulose (for example, an average width of 25 nm or less, preferably 20 nm or less, more preferably 15 nm or less, more preferably 8-12 nm) with an average thickness of 8-12 nm.
- / bacterial cellulose refers to a cellulose produced by microorganisms, except for special cases, and is a polysaccharide mainly composed of 1,4 dalcoside bonds (unless otherwise indicated). In the form of a gel film (pellicle). Nocteria cellulose can be produced by methods well known to those skilled in the art.
- opposite collision refers to a case where a polysaccharide dispersion is injected from a pair of nozzles at a high pressure of 70 to 250 MPa, respectively, except for special cases.
- a wet pulverization method in which cellulose fibers are pulverized by colliding with each other. Details of this method are disclosed in JP-A-2005-270891.
- Opposite collision treatment is a wet atomization method that uses the collision energy of ultra-high pressure water to ultrafine the material. Compared to other pulverization methods, bead mill, jet mill, stirrer, high-pressure homogenizer, etc., it has various excellent advantages. For example, since no grinding media is used, there is no mixing of wear powder in the media, and a more uniform and sharp particle size distribution than the media agitation method is obtained. Furthermore, continuous treatment, large capacity is easy, and treatment with less contact time with the atmosphere For example, the oxidation of the product can be suppressed as much as possible. [0018] As a device for the counter collision treatment, a high-pressure washing device or a high-pressure homogenizer device for pulverization / dispersion / emulsification can be used.
- cellulose is suspended in water.
- Cellulose may be pulverized in advance if necessary.
- the dispersion concentration of the suspension is preferably 0.1 to 10% by mass, preferably a concentration suitable for passing through the piping as the dispersion slurry.
- the dispersion liquid is ejected from a pair of nozzles at a high pressure of 70 to 250 MPa, and the jet flow collides with each other to be pulverized.
- the angle of the high-pressure jet flow of the dispersion injected from the pair of nozzles is adjusted so that the jet flows collide at an appropriate angle at one point ahead of each nozzle outlet.
- the average particle length of the cell mouth fibers can be pulverized to 1Z4 or less or 10 ⁇ m. The decrease can also be suppressed.
- the collision angle ⁇ can be 95 to 178 °, for example, 100 to 170 °. If it is smaller than 95 °, for example, if it is made to collide at 90 °, structurally, the collision dispersion liquid tends to generate a portion that directly collides with the wall of the chamber, and cellulose polymerization occurs in one collision. Degradation often exceeds 10%. On the other hand, when the angle is larger than 178 °, for example, when the collision is 180 °, that is, when the collision is made in the face-to-face relationship, the degree of polymerization in one collision may be severely reduced when the collision energy is large.
- the number of collisions may be 1 to 200 times, for example, 5 to 120 times, -60 times, -30 times, -15 times, -10 times. If the number of pulverization is large, the decrease in the degree of polymerization of cellulose may exceed 10%.
- the collision angle and Z or the number of collisions can be appropriately designed in consideration of the decomposition efficiency of cellulose and the like.
- the average particle length of cellulose after the collision treatment can be made 1Z4 or less, 1Z5 to 1Z100, 1Z6 to 1Z50, 1 to 1Z20 before the treatment.
- the average particle length can be 10 m or less, 0.01 to 9 ⁇ ⁇ , 0.1 to 8 m, or 0.1 to 5 ⁇ m.
- Cellulose fibers have a particle width in a direction perpendicular to the average particle length. This width is referred to as the average particle width. This is also adjusted to 10 m or less, 0.01 to 9 / ⁇ ⁇ , and 0.1 to 8 / ⁇ ⁇ by adjusting the collision angle and Z or the number of collisions. be able to.
- the processed object once subjected to the collision process is, for example, 4 to 20 ° C, or 5 as necessary. It may be cooled to ⁇ 15 ° C. Equipment for cooling can be incorporated in the opposing collision processing apparatus.
- centrifugation as a method for taking out only a portion where the processed fiber strength is particularly strong in the cellulose fiber, for example, centrifugation may be mentioned.
- Cellulose particles with an average particle length of less than 1 ⁇ m can be obtained by centrifuging the treated product and collecting the supernatant.
- Bacterial cellulose itself forms a strong film (pelicle) on the gel in which fibers are networked and cannot be mixed with PLA.
- the cellulose nanofibers may be tens of nanosize fibers.
- the fiber width in nano order can be controlled easily and quickly.
- cellulose fibers are usually refined to nano-size by 5 or more opposing collisions, and more collisions contribute to surface condition modification in addition to refinement. If the size of the fiber is the same as that of the nanoorder, not only the size but also the fluffing of the fiber surface due to underwater collision, that is, the increase of the specific surface area of the fiber surface is good molding processability in the resulting resin composition, This is considered to bring about a combination of heat resistance and strength.
- cellulose fibers of various origins having different widths in the nanoorder can be applied to the present invention.
- I-alpha triclinic
- the molecular morphology of plant-derived surfaces takes the form of monoclinic crystals called (beta). Therefore, the surface properties of the nanofibers are different.
- the resin composition of the present invention can be produced by mixing (blending) polylactic acid and cellulose nanofibers. Disperse cellulose nanofibers uniformly against polylactic acid For this purpose, it is usually necessary to add water. If mixed at the stage of underwater oncoming collision, nano dispersion becomes possible. If the suspension suspension of bacterial cellulose and PLA is nano-dispersed at the same time as fragmentation in a collision, it can be visually confirmed whether a uniform mixture is obtained.
- the mixing ratio of the polylactic acid and the cellulose nanofiber in the rosin composition of the present invention can be various, but 0.05 to 10% by weight (for example, 0.1 to 5% by weight, 0.5
- a 2.5% by weight of cellulose nanofibers By adding ⁇ 2.5% by weight of cellulose nanofibers, it is possible to exert the effects as described later.
- Cellulose nanofiber surfaces obtained by colliding with each other have fluff of molecular size (sub-nanometer size) in addition to fluff of nanosize, so that the specific surface area combined with them shows a strong adsorbing power. Yes. Therefore, it seems that a large amount of addition is not necessary in the first place for the effect of nanofibers to appear.
- the resin composition does not completely melt at 200 ° C., which may increase the difficulty in molding.
- a large amount of additive only partially melts the region of polylactic acid that does not interact with cellulose nanofibers, and the region that interacts with fibers has compatibility due to its strong interaction. It is speculated that this is a region that can no longer be crystallized with high polylactic acid alone. In other words, it is presumed that increasing the amount added depends more on the properties of cellulose nanofibers (thermal stability up to 300 ° C). Considering these points, the strength (structure thermal stability, Young's modulus, etc.) from a viewpoint different from that of conventional polylactic acid can be proposed by adding a large amount of nanofibers.
- Molded products manufactured using the rosin composition of the present invention have good moldability due to the effect of promoting the crystallization of polylactic acid in cellulose nanofibers, and also have heat resistance and strength. Excellent in.
- the time to the exothermic peak due to crystallization of polylactic acid when held at 100 ° C. was 5.8 minutes for polylactic acid alone.
- An annealing treatment after molding is necessary, and there is a problem that productivity is low.
- the crystallization of polylactic acid is very slow and slow, and even at the stage of commercialization after molding, the crystallization is not actually finished, and as a result, it shows the expected heat resistance. It wasn't. However, if crystallization progresses rapidly with cellulose nanofibers, crystallization is promoted more than before in the molding process, and it is possible to obtain a resin product with higher heat resistance. Become.
- the heat resistance of a molded product produced using the resin composition of the present invention can be evaluated by the tensile strength under heating and the deflection temperature under load.
- the tensile strength of the melt-molded product of the resin composition of the present invention was inferior to that of general-purpose plastics (see Examples). Although it has been reported that the tensile strength decreased as the mixing ratio of microcrystalline cellulose to polylactic acid increased (see Non-Patent Document 2), in the present invention, cellulose nanofibers are added to polylactic acid. As a result, the tensile strength can be increased. This difference is considered to be due to the fact that cell mouth nanofibers have different interactions with polylactic acid than microcrystalline cellulose, even for the same cellulose.
- a molded product produced using the rosin composition of the present invention is excellent in degradability.
- Degradability (sometimes referred to as “biodegradable”) refers to organic materials that retain material properties that meet the purpose for the period in which they are used for a specific purpose, and after the end of the purpose or after disposal Refers to a function that weakens in the natural or in vivo environment. A person skilled in the art can appropriately evaluate the degradability.
- JIS K 6950 (ISO 14851) Determination of aerobic ultimate biodegradability in plastic monohydrate culture (method of measuring oxygen consumption using a closed respirometer), JIS K 6951 (ISO 14852) , Aerobic studies in plastic monohydrate cultures How to determine the degree of extreme biodegradation (method by measuring the amount of carbon dioxide generated), JIS K 6953 (ISO 1485 5) plastics under controlled composting conditions It can be evaluated by the method of obtaining the ultimate degree of ultimate biodegradation and disintegration (method by measuring the amount of carbon dioxide generated).
- the present invention relates to a method for promoting crystallization of a polylactic acid-containing resin composition characterized by adding 0.05 to 5% by weight of cellulose nanofibers to polylactic acid; Characterized by adding 0.05 to 10% by weight of cellulose nanofibers to acid, A method for improving the heat resistance of a lactic acid-containing coffin composition; a method for improving the strength of a polylactic acid-containing resin composition, characterized by adding 0.05 to 10% by weight of cellulose nanofibers to polylactic acid; Also provided is a method for improving the moldability of a polylactic acid-containing rosin composition, characterized in that 0.05 to 10% by weight of cellulose nanofibers is added to polylactic acid.
- the present invention provides a molded product comprising the resin composition of the present invention.
- the molding process can be performed by various processes such as inflation molding, calendar molding, balloon molding, blow molding, compression molding, injection molding, and extrusion molding.
- the resin composition of the present invention can be molded by a conventional molding cycle applied to a conventional general-purpose resin without using a special process such as annealing.
- the obtained molded product has excellent heat resistance and sufficient strength. Therefore, the molded product of the present invention can be used as an interior material, an impact absorbing material, a general-purpose plastic, and a food container.
- the composition of the present invention using the cellulose cellulose nanofibers can be expected to be applied to biomaterials (such as regenerative medical scaffolds) utilizing the biocompatibility of bacterial cellulose.
- Acetobactor xylinum 3 ⁇ Gluconacetobactor xvnnus (producing strain: ATCC 53582) was cultured (the preparation method for bacterial cellulose culture is described in Hestrin, S. & Schramm, M. ( 1954) According to Biochem. T. 58, 345— 352.) The obtained cellulose pellicle was cut into lcm square size as it was, suspended in water, and then subjected to counter collision (equipment used: Optimizer 1 (Sugino Machine). Manufactured), pressure 200MPa, number of collisions
- the obtained suspension was freeze-dried and used as cellulose nanofibers in the following tensile experiments and thermal analysis (procedure 1).
- cellulose cellulose was obtained by the same method as described above except that the number of collisions was 60 times.
- a fiber suspension was prepared and used for thermal analysis (Procedure 2).
- Powdered polylactic acid having a number average molecular weight of 90,000 and a weight average molecular weight of 130,000 was used.
- Cellulose nanofibers (1% by weight based on polylactic acid) obtained by the counter collision treatment are added to powdered polylactic acid.
- Cellulose nanofiber suspension was added to 2 g of polylactic acid powder so that the weight of nanocellulose fiber was 0.2 g or 0.02 g.
- 400 mL of deionized water was added to each, and suspended with a high-speed homogenizer at 20000 rpm for 1 minute. This suspension is centrifuged at 3000 rpm for 10 minutes, the precipitate is collected, dried at 40 ° C, and the ratio (weight) of polylactic acid to nanocellulose is 10: 1 and 100: 1 ( A sample of polylactic acid: nanocellulose) was obtained.
- 0.2 g or 0.02 g of Tackle (manufactured by Wako Pure Chemical Industries, Ltd.) was added to 2 g of polylactic acid powder. Next ⁇ In each, 400 mL of deionized water was added and suspended in a high-speed homogenizer at 20000 rpm for 1 minute. The resulting suspension is centrifuged at 3000 rpm for 10 minutes, the precipitate is collected, dried at 40 ° C, and the ratio of polylactic acid to tackle is 10: 1 or 100: 1 (polylactic acid: Two comparative samples were prepared.
- the tensile strength of the test piece was measured using Strograph E-S (manufactured by Toyo Seiki Seisakusho). The tensile rate of the sample was 5 mm / min.
- the sample prepared in step 1 above was held at 200 ° C for 5 minutes, then cooled to 100 ° C at 200 ° C / min, and the crystallization induction time at 100 ° C was measured (Fig. 1). reference).
- the crystallization induction time refers to the time until an exothermic peak due to crystallization appears when isothermal crystallization is performed. The shorter the crystallization induction time is, the more easily polylactic acid is crystallized, and the low crystallization will lead to improvement in the molding speed and heat resistance of polylactic acid.
- Table 1 compares the tensile strengths of the polylactic acid and polylactic acid / cellulose nanofiber composites used in this experiment with general-purpose plastic and polylactic acid / micro microcrystalline cellulose composites.
- Table 1 shows, the tensile strength decreases as the mixing ratio of microcrystalline cellulose to polylactic acid increases.
- tensile strength was increased by adding cellulose nanofibers to polylactic acid. This is different from micro-microcrystalline cellulose for cellulose nanofibers, even with the same cellulose. This suggests that there is an interaction with polylactic acid.
- the tensile strength of polylactic acid / cellulose nanofiber composites is inferior to those of general-purpose plastics.
- PET Polyethylene terephthalate
- PS Polystyrene
- PP Polypropylene
- PE Polyethylene
- the crystallization induction time when held at 120 ° C is 1.9 minutes on average for the sample added with 1% by weight cellulose nanofibers relative to polylactic acid, and 10% by weight. The average of 1.5 minutes was obtained for the sample to which% cellulose nanofiber was added. This was shorter than the talc-added sample for comparison.
- (1) to (3) show the exothermic behavior of the cellulose nanofiber-added sample
- (4) to (6) show the exothermic behavior of the talc-added sample, respectively. It is a thing.
- a sample of polylactic acid alone and cellulose nanofibers obtained by drying a cellulose nanofiber suspension prepared by the same method as above except that the pressure was 100 MPa and the number of collisions was 5) The crystallization behavior of a sample prepared by adding 1% by weight to polylactic acid was observed.
- FIG. 4 A sample containing only polylactic acid and a sample added with cellulose nanofibers were melted at 200 ° C, respectively, and then isothermally crystallized at 120 ° C. Then, the isothermal crystallization started and the state of crystallization was photographed with a polarizing microscope every minute.
- Figures 4 and 5 show the photographs taken (in the figure, the bar on the lower right of each photograph is a 100 m scale). As shown in Figs. 4 and 5, the sample added with cellulose nanofibers (Fig. 5) forms crystals faster than the sample containing only polylactic acid (Fig. 4). This means that the cellulose nanofiber functions as a crystal nucleating agent for polylactic acid and improves the crystallization rate of polylactic acid.
- cellulose nanofibers obtained by facing collision treatment with polylactic acid By blending cellulose nanofibers obtained by facing collision treatment with polylactic acid, the tensile strength of polylactic acid is improved, and cellulose nanofibers become polylactic acid nucleating agents to improve the crystallization rate of polylactic acid. I was strong. Thus, cellulose nanofibers improve the heat resistance and strength of polylactic acid, which is important as a structural material, while maintaining the biodegradability of polylactic acid. From the above, it can be said that blending with cellulose nanofibers is a very effective means in expanding the application field of polylactic acid.
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Abstract
Description
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/301,977 US20100240806A1 (en) | 2006-05-23 | 2007-05-23 | Materials containing polyactic acid and cellulose fibers |
| JP2008516715A JPWO2007136086A1 (ja) | 2006-05-23 | 2007-05-23 | ポリ乳酸とセルロース繊維とを含有する材料 |
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|---|---|---|---|
| JP2006-143091 | 2006-05-23 | ||
| JP2006143091 | 2006-05-23 |
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| WO2007136086A1 true WO2007136086A1 (ja) | 2007-11-29 |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008016351A1 (de) | 2008-03-29 | 2009-10-01 | Teijin Monofilament Germany Gmbh | Bioabbaubare Monofilamente und deren Verwendung im Feld- und Gartenbau |
| DE102008016350A1 (de) | 2008-03-29 | 2009-10-01 | Teijin Monofilament Germany Gmbh | Bioabbaubare profilierte Monofilamente und deren Verwendung |
| WO2010016619A1 (en) * | 2008-08-08 | 2010-02-11 | Kao Corporatioin | Biodegradable resin composition |
| EP2194174A1 (de) | 2008-12-06 | 2010-06-09 | Teijin Monofilament Germany GmbH | Bündel aus bioabbaubaren Monofilamenten und deren Verwendung in Wasserbauwerken |
| JP2010270289A (ja) * | 2008-07-22 | 2010-12-02 | Kao Corp | 生分解性樹脂組成物 |
| JP2011153297A (ja) * | 2009-12-28 | 2011-08-11 | Kao Corp | 生分解性樹脂組成物 |
| JP2011153296A (ja) * | 2009-12-28 | 2011-08-11 | Kao Corp | 生分解性樹脂組成物 |
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| US20100240806A1 (en) | 2010-09-23 |
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