Molding material, molded article, and method for producing molded article

Abstract

To provide a molding material containing cellulose fibers that can be suitably used for producing molded articles excellent in strength and impact resistance, and that exhibits excellent moldability during the production of molded articles.SOLUTION: The molding material comprises cellulose fibers and a specific cellulose derivative in which some of the hydrogen atoms constituting the hydroxyl groups of cellulose are substituted with a first chemical structure that is a chemical structure of the general formula of at least one of formula (A), -RA, and formula (B), -CO-RB, and others of the hydrogen atoms are substituted with a second chemical structure that is a chemical structure of the general formula of formula (C) in the figure. (In the formulas, RA is a monovalent hydrocarbon group having 1 to 8 carbon atoms, RB is a monovalent hydrocarbon group having 1 to 14 carbon atoms, n is 0 or 1, m is an integer from 0 to 4 inclusive, l is 0 or 1, and RC+ is a cationic chemical structure.)SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a molding material, a molded article, and a method for producing a molded article. [Background technology]

[0002] As a measure to combat oil depletion and global warming, attempts are being considered to replace conventional plastic materials with molding materials made from cellulose, a plant-derived, abundant natural material.

[0003] For example, a molded article containing natural cellulose fibers and cellulose esters such as cellulose acetate butyrate and cellulose acetate propionate has been proposed as a nonwoven web or composite structure that can be disposed of in a composting landfill (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2005-504184 Summary of the Invention [Problem to be solved by the invention]

[0005] However, such molded articles have problems in that they are inferior in strength and impact resistance, and are poor in moldability during production. [Means for solving the problem]

[0006] The present invention has been made to solve the above-mentioned problems, and can be realized as the following application examples.

[0007] The molding material according to an application example of the present invention comprises cellulose fibers and and a specific cellulose derivative in which some of the hydrogen atoms constituting the hydroxyl groups of cellulose are substituted with a first chemical structure which is a chemical structure of at least one of the following general formulas (A) and (B), and other hydrogen atoms are substituted with a second chemical structure which is a chemical structure of the following general formula (C).

[0008] [ka] (In formula (A), R A is a monovalent hydrocarbon group having 1 to 8 carbon atoms.

[0009] [ka] (In formula (B), R B is a monovalent hydrocarbon group having 1 to 14 carbon atoms.

[0010] [ka] (In formula (C), n is 0 or 1, m is an integer of 0 or more and 4 or less, l is 0 or 1, and R C + is a cationic chemical structure.)

[0011] Furthermore, a molded article according to an application example of the present invention is made of a material containing the molding material according to an application example of the present invention.

[0012] In addition, a method for producing a molded body according to an application example of the present invention includes: a molding material preparation step of preparing a molding material according to an application example of the present invention; and a heat molding step of heat molding the molding material. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a table summarizing the conditions for synthesizing the cellulose derivatives in Synthesis Examples 1 to 20. [Figure 2]FIG. 2 is a table summarizing the conditions for synthesizing the cellulose derivatives in Synthesis Examples 21 to 30. [Figure 3] FIG. 3 is a table summarizing the compositions and evaluation results of the molding materials of Examples 1 to 16. [Figure 4] FIG. 4 is a table summarizing the compositions and evaluation results of the molding materials of Examples 17 to 29 and Comparative Examples 1 to 6. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will be described in detail below. [1] Molding material First, the molding material of the present invention will be described.

[0015] The molding material of the present invention comprises cellulose fibers and a specific cellulose derivative in which some of the hydrogen atoms constituting the hydroxyl groups of the cellulose are substituted with a first chemical structure which is a chemical structure of at least one of the following general formulas (A) and (B), and other hydrogen atoms are substituted with a second chemical structure which is a chemical structure of the following general formula (C):

[0016] [ka] (In formula (A), R A is a monovalent hydrocarbon group having 1 to 8 carbon atoms.

[0017] [ka] (In formula (B), R B is a monovalent hydrocarbon group having 1 to 14 carbon atoms.

[0018] [ka] (In formula (C), n is 0 or 1, m is an integer of 0 or more and 4 or less, l is 0 or 1, and R C +is a cationic chemical structure.)

[0019] With this configuration, it is possible to provide a molding material that can be suitably used to produce molded articles that are excellent in strength and impact resistance, and that has excellent moldability when producing molded articles.

[0020] The reasons for such excellent effects are believed to be as follows. Specifically, by including a specific cellulose derivative that has excellent compatibility and affinity with cellulose fibers, excellent heat resistance and toughness, and excellent fluidity when melted, in addition to cellulose, which has high theoretical strength and excellent shape stability, the functions of these components can be prevented or suppressed from canceling out, allowing these components to fully exhibit their functions. More specifically, during the production of a molded article using the molding material, or in a molded article produced using the molding material, the functions of the cellulose fibers and the specific cellulose derivative can be fully exhibited, while the wettability of the specific cellulose derivative with the cellulose fibers can be increased, and interfacial delamination between the different components constituting the molded article can be suitably prevented or suppressed. As a result, the above-mentioned excellent effects are believed to be obtained. In particular, the specific cellulose derivative having a first chemical structure improves the strength of the molded article produced using the molding material, and the specific cellulose derivative having a second chemical structure improves the compatibility between the specific cellulose derivative and cellulose fibers, resulting in excellent impact resistance of the molded article produced using the molding material.

[0021] Furthermore, since interfacial peeling between different components constituting the molded body can be suitably prevented or suppressed, a molded body can be obtained in which problems such as dust generation are effectively prevented.

[0022] Furthermore, the inclusion of cellulose fiber, which is a plant-derived, abundant natural material, makes it possible to appropriately address environmental issues and conserve buried resources, etc., and is also advantageous from the viewpoints of stable supply of molding materials and molded articles produced using the same, cost reduction, etc. Furthermore, cellulose fiber is a component that is contained in large amounts not only in virgin pulp but also in waste paper, used cloth, etc., and is therefore advantageous from the viewpoint of promoting effective reuse of resources.

[0023] Furthermore, the specific cellulose derivatives can be suitably obtained from the above-mentioned cellulose as a raw material and are generally components with excellent biodegradability, which allows the molding material as a whole and the molded article produced using the molding material as a whole to suitably address environmental issues, etc.

[0024] On the other hand, if the above conditions are not met, satisfactory results will not be obtained. For example, even if a molding material contains cellulose fibers, if it does not contain a specific cellulose derivative, the molded article produced using the molding material will have significantly poorer impact resistance, etc., and will also have poor moldability during production.

[0025] Furthermore, if other cellulose derivatives are used in place of the specific cellulose derivatives and the specific cellulose derivatives are not included, the strength and impact resistance of the molded body produced using the molding material may be inferior, and the moldability during production of the molded body may be inferior.

[0026] For example, if a cellulose derivative having a first chemical structure but not a second chemical structure is used instead of the specific cellulose derivative, the impact resistance of the molded body produced using the molding material will be inferior.

[0027] Furthermore, if a cellulose derivative having the second chemical structure but not the first chemical structure is used instead of the specific cellulose derivative, the heat resistance and flexural modulus of the molded body produced using the molding material will be inferior.

[0028] Furthermore, if a cellulose derivative having a second chemical structure but not having the first chemical structure, and having a chemical structure in which the hydrocarbon group in the above formula (A) has 9 or more carbon atoms instead of the first chemical structure, or a cellulose derivative having a chemical structure in which the hydrocarbon group in the above formula (B) has 15 or more carbon atoms instead of the first chemical structure, is used instead of the specific cellulose derivative, the flexural modulus of the molded body produced using the molding material will be inferior.

[0029] Furthermore, if a cellulose derivative having a first chemical structure but not a second chemical structure, in which m in the above formula (C) is an integer of 5 or greater, is used instead of the specific cellulose derivative, the flexural modulus of the molded body produced using the molding material will be inferior.

[0030] Furthermore, if a cellulose derivative having a first chemical structure but not a second chemical structure, in which the second chemical structure is replaced by a chemical structure in which l in the above formula (C) is an integer of 2 or greater, is used instead of the specific cellulose derivative, the molding material will have poor moldability.

[0031] [1-1] Cellulose fiber The molding material of the present invention contains cellulose fibers.

[0032] Cellulose fiber is the main component of the molding material of the present invention, and is a component that contributes greatly to maintaining the shape of the molded body produced using the molding material of the present invention, as well as having a significant impact on the properties of the molded body, such as its strength.

[0033] Cellulose is a naturally occurring material derived from plants and is abundant in nature. Therefore, the use of cellulose fibers can effectively address environmental issues and conserve buried resources, and is also preferable from the viewpoints of stable supply of molding materials and molded articles produced using the same, cost reduction, etc. Furthermore, among various fibers, cellulose fibers have particularly high theoretical strength, and are advantageous from the viewpoint of improving the strength of molded articles.

[0034] As the cellulose fiber, virgin pulp may be used, or recycled waste paper, waste cloth, etc. may be used.

[0035] Cellulose fibers are generally composed mainly of cellulose, but may contain components other than cellulose, such as hemicellulose and lignin.

[0036] Furthermore, the cellulose fibers used may be those that have been subjected to a treatment such as bleaching. Examples of cellulose fibers include cotton, hemp, rayon, and cupra.

[0037] The content of cellulose fibers in the molding material is not particularly limited, but is preferably 35% by mass or more and 80% by mass or less, more preferably 50% by mass or more and 78% by mass or less, and even more preferably 55% by mass or more and 75% by mass or less.

[0038] This results in the material containing a larger amount of cellulose fiber, which is a plant-derived, abundant natural material, which can more appropriately address environmental issues and conserve buried resources, and is more preferable from the standpoint of stable supply of molding materials and molded articles produced using them, cost reduction, etc. It is also more preferable from the standpoint of improving the strength of molded articles, and the moldability of the molding material will be better.

[0039] When the molding material contains a cellulose ester resin described below, the value of [XF / (XF+XD1+XD2)]×100, where XF is the cellulose fiber content in the molding material (mass%), XD1 is the specific cellulose derivative content (mass%), and XD2 is the cellulose ester resin content (mass%), is preferably 40 or more and 90 or less, more preferably 50 or more and 80 or less, and even more preferably 55 or more and 75 or less.

[0040] This results in the material containing a larger amount of cellulose fiber, which is a plant-derived, abundant natural material, which can more appropriately address environmental issues and conserve buried resources, and is more preferable from the standpoint of stable supply of molding materials and molded articles produced using them, cost reduction, etc. It is also more preferable from the standpoint of improving the strength of molded articles, and the moldability of the molding material will be better.

[0041] The average length of the cellulose fibers is not particularly limited, but is preferably 500 μm or less, more preferably 1 μm or more and 400 μm or less, and even more preferably 1 μm or more and 50 μm or less.

[0042] This improves the affinity and compatibility of the cellulose fibers with specific cellulose derivatives and cellulose ester resins (described later), thereby improving the shape stability and strength of molded articles produced using the molding material. Furthermore, dust generation in molded articles produced using the molding material can be more effectively prevented or suppressed. Furthermore, the occurrence of undesired irregularities on the surface of molded articles produced using the molding material can be more effectively prevented. The fiber length of the cellulose fibers is determined by a method conforming to ISO 16065-2:2007.

[0043] The average thickness of the cellulose fibers is not particularly limited, but is preferably 0.1 μm or more and 100 μm or less, and more preferably 0.2 μm or more and 20 μm or less.

[0044] This makes it possible to improve the shape stability, strength, etc. of a molded article produced using the molding material, and also makes it possible to more effectively prevent the occurrence of undesired irregularities on the surface of a molded article produced using the molding material.

[0045] The average aspect ratio of the cellulose fibers, that is, the average length to the average thickness, is not particularly limited, but is preferably 10 or more and 1,000 or less, and more preferably 15 or more and 100 or less.

[0046] This makes it possible to improve the shape stability, strength, etc. of a molded article produced using the molding material. Also, dust generation in a molded article produced using the molding material can be more effectively prevented or suppressed. Also, it is possible to more effectively prevent the occurrence of undesired irregularities on the surface of a molded article produced using the molding material.

[0047] [1-2] Specific cellulose derivatives The molding material of the present invention contains a specific cellulose derivative.

[0048] The specific cellulose derivative is a compound in which some of the hydrogen atoms constituting the hydroxyl groups of cellulose are substituted with a first chemical structure which is a chemical structure of at least one of the general formulas (A) and (B) above, and other hydrogen atoms are substituted with a second chemical structure which is a chemical structure of the general formula (C) above.

[0049] R in the above formula (A) A is a monovalent hydrocarbon group having 1 to 8 carbon atoms, but is preferably an alkyl group having 1 to 6 carbon atoms, and more preferably an alkyl group having 2 to 5 carbon atoms.

[0050] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0051] When the specific cellulose derivative has a chemical structure represented by the above formula (A), the specific cellulose derivative may have two or more chemical structures with different conditions as the chemical structure represented by the above formula (A).

[0052] R in the above formula (B) B is a monovalent hydrocarbon group having 1 to 14 carbon atoms, but is preferably an alkyl group or aryl group having 1 to 12 carbon atoms, and more preferably an alkyl group or aryl group having 2 to 10 carbon atoms.

[0053] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0054] When the specific cellulose derivative has a chemical structure represented by the above formula (B), the specific cellulose derivative may have two or more chemical structures with different conditions as the chemical structure represented by the above formula (B).

[0055] In the specific cellulose derivative, the DS value of the first chemical structure, i.e., the degree of substitution, which is the value corresponding to the number of hydrogen atoms of all hydroxyl groups in cellulose that are substituted with the first chemical structure divided by the number of glucose atoms that constitute the cellulose, is preferably 1.2 or more and 2.5 or less, more preferably 1.2 or more and 2.3 or less, and even more preferably 1.3 or more and 2.1 or less.

[0056] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0057] In the above formula (C), n may be 0 or 1. In the above formula (C), m may be an integer of 0 or more and 4 or less, and is preferably an integer of 0 or more and 2 or less.

[0058] This allows the shape stability, flexural modulus, etc. of a molded article produced using the molding material to be improved.

[0059] In the above formula (C), l may be 0 or 1. R in the above formula (C) C + is not particularly limited as long as it has a cationic chemical structure, but is preferably at least one of the following formulas (6) to (12).

[0060] [ka] (In formula (6), n is an integer of 1 or more and 18 or less.)

[0061] [ka] (In formula (7), n is an integer of 1 or more and 18 or less.)

[0062] [ka] (In formula (8), n is an integer of 1 or more and 18 or less.)

[0063] [ka] (In formula (9), n is an integer of 1 or more and 18 or less.)

[0064] [ka] (In formula (10), n is an integer of 1 or more and 18 or less.)

[0065] [ka] (In formula (11), n is an integer of 1 or more and 18 or less.)

[0066] [ka]

[0067] This improves the moldability of the molding material, and also improves the strength of the molded article produced using the molding material.

[0068] In the above formula (6), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less. This makes the above-mentioned effects more pronounced.

[0069] In the above formula (7), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less. This makes the above-mentioned effects more pronounced.

[0070] In the above formula (8), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less. This makes the above-mentioned effects more pronounced.

[0071] In the above formula (9), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less. This makes the above-mentioned effects more pronounced.

[0072] In the above formula (10), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less. This makes the above-mentioned effects more pronounced.

[0073] In the above formula (11), n may be an integer of 1 or more and 18 or less, preferably an integer of 1 or more and 15 or less, and more preferably an integer of 2 or more and 12 or less.

[0074] This allows the aforementioned effects to be more significantly exhibited, more specifically, the specific cellulose derivative can be more effectively prevented from separating, the dispersibility of the specific cellulose derivative in the surrounding resin can be improved, and the mechanical properties can also be improved.

[0075] The specific cellulose derivative may have the chemical structure represented by the above formula (C), that is, two or more chemical structures with different conditions as the second chemical structure.

[0076] The DS value of the second chemical structure in the specific cellulose derivative, i.e., the degree of substitution, which is the value corresponding to the number of hydrogen atoms of all hydroxyl groups in cellulose that are substituted with the second chemical structure divided by the number of glucose atoms that constitute the cellulose, is preferably 0.1 or more and 1.6 or less, more preferably 0.2 or more and 1.5 or less.

[0077] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0078] In the specific cellulose derivative, the sum of the DS value of the first chemical structure and the DS value of the second chemical structure is preferably 2.0 or more and 3.0 or less, more preferably 2.1 or more and 2.7 or less, and even more preferably 2.2 or more and 2.7 or less.

[0079] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0080] In particular, for a specific cellulose derivative, the above-mentioned effects are more pronounced when the DS value of the first chemical structure, the DS value of the second chemical structure, and the sum of the DS value of the first chemical structure and the DS value of the second chemical structure all satisfy the above-mentioned conditions.

[0081] In the specific cellulose derivative, the total DS value of all the substituents is preferably 2.0 or more and 3.0 or less, more preferably 2.1 or more and 2.8 or less, and even more preferably 2.2 or more and 2.7 or less.

[0082] This makes it possible to further improve the strength and impact resistance of a molded article produced using the molding material, and to further improve the moldability during production of the molded article.

[0083] The number average molecular weight of the specific cellulose derivative is preferably 5,000 or more and 400,000 or less, more preferably 7,000 or more and 300,000 or less, and even more preferably 10,000 or more and 200,000 or less.

[0084] This makes it possible to improve the affinity and compatibility of the specific cellulose derivative with cellulose fibers, thereby improving the strength and impact resistance of molded bodies produced using the molding material and improving the moldability during production of the molded bodies.

[0085] The content of the specific cellulose derivative in the molding material is preferably 4% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 45% by mass or less, and even more preferably 15% by mass or more and 40% by mass or less.

[0086] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0087] In particular, when the content of the cellulose fiber and the content of the specific cellulose derivative in the molding material both satisfy the above-mentioned conditions, the above-mentioned effects are more significantly exhibited.

[0088] When the molding material contains a cellulose ester resin described below, the value of [XD1 / (XF+XD1+XD2)] × 100, where XF is the cellulose fiber content in the molding material (mass%), XD1 is the specific cellulose derivative content (mass%), and XD2 is the cellulose ester resin content (mass%), is preferably 5 or more and 55 or less, more preferably 10 or more and 50 or less, and even more preferably 15 or more and 44 or less.

[0089] This makes it possible to more effectively prevent an increase in the cost of the molding material, while improving the plasticity and moldability of the molding material.

[0090] When the content of cellulose fiber in the molding material is XF [mass%] and the content of the specific cellulose derivative is XD1 [mass%], it is preferable to satisfy the relationship 0.10≦XD1 / XF≦0.80, it is more preferable to satisfy the relationship 0.12≦XD1 / XF≦0.70, and it is even more preferable to satisfy the relationship 0.13≦XD1 / XF≦0.60.

[0091] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0092] [1-3] Cellulose ester resin The molding material of the present invention preferably further contains, in addition to the cellulose fibers and specific cellulose derivatives described above, a cellulose ester resin in which at least a portion of the hydroxyl groups of cellulose have been esterified.

[0093] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0094] When the molding material of the present invention contains a cellulose ester resin, the cellulose ester resin preferably has a structure in which an alkyl group having 1 to 18 carbon atoms is bonded to an ester group.

[0095] This makes it possible to further improve the affinity and compatibility between the specific cellulose derivative and the cellulose ester resin, thereby further improving the strength and impact resistance of molded articles produced using the molding material and further improving the moldability during production of the molded articles.

[0096] The cellulose ester resin may have, for example, a plurality of different modifying groups. More specifically, the cellulose ester resin may have, for example, a plurality of ester groups in the molecule, and may have a plurality of alkyl groups with different carbon numbers as alkyl groups bonded to these ester groups.

[0097] Preferred specific examples of the cellulose ester resin include cellulose acetate propionate, cellulose acetate butyrate, and cellulose acetate, and the molding material of the present invention preferably contains at least one selected from these.

[0098] These cellulose ester resins have particularly excellent affinity and compatibility with the specific cellulose derivatives described above, and by including such cellulose ester resins, the strength and impact resistance of the molded body produced using the molding material can be made particularly excellent, and the moldability during production of the molded body can be made particularly excellent.

[0099] The content of the cellulose ester resin in the molding material is preferably 3% by mass to 45% by mass, more preferably 5% by mass to 40% by mass, and even more preferably 10% by mass to 30% by mass.

[0100] This makes it possible to improve the strength and impact resistance of a molded article produced using the molding material, and to improve the moldability during production of the molded article.

[0101] [1-4] Flame retardants The molding material of the present invention may further contain a flame retardant.

[0102] This makes it possible to improve the flame retardancy of a molded article produced using the molding material of the present invention.

[0103] Examples of the flame retardant include bromine-based flame retardants, chlorine-based flame retardants, phosphorus-containing flame retardants, silicon-containing flame retardants, nitrogen compound-based flame retardants, and inorganic flame retardants.

[0104] Among these, phosphorus-containing flame retardants and silicon-containing flame retardants are preferred because they do not generate hydrogen halides through thermal decomposition during mixing / kneading with other components or during molding processing, which may corrode processing machinery or molds or worsen the working environment, and they are less likely to have adverse effects on the environment through the release of halogens or the generation of dioxins and other compounds through decomposition when incinerated.

[0105] Examples of phosphorus-containing flame retardants include organic phosphorus compounds such as phosphate esters, phosphate condensed esters, and polyphosphates.

[0106] Examples of phosphate esters include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri(2-ethylhexyl) phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tris(isopropylphenyl) phosphate, tris(phenylphenyl) phosphate, trinaphthyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, diphenyl(2-ethylhexyl) phosphate, di(isopropylphenyl) phosphate, Examples of suitable acryloyloxyethyl phosphate include diphenyl-2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, diphenyl-2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, melamine phosphate, dimelamine phosphate, melamine pyrophosphate, triphenylphosphine oxide, tricresylphosphine oxide, diphenyl methanephosphonate, and diethyl phenylphosphonate.

[0107] Examples of the phosphoric acid condensed ester include aromatic phosphoric acid condensed esters such as resorcinol polyphenyl phosphate, resorcinol poly(di-2,6-xylyl) phosphate, bisphenol A polycresyl phosphate, hydroquinone poly(2,6-xylyl) phosphate, and condensates thereof.

[0108] Further examples include polyphosphates formed from salts of phosphoric acid or polyphosphoric acid with metals of Groups 1 to 14 of the periodic table, ammonia, aliphatic amines, and aromatic amines. Representative polyphosphate salts include metal salts such as lithium salt, sodium salt, calcium salt, barium salt, iron (II) salt, iron (III) salt, and aluminum salt; aliphatic amine salts such as methylamine salt, ethylamine salt, diethylamine salt, triethylamine salt, ethylenediamine salt, and piperazine salt; and aromatic amine salts such as pyridine salt and triazine.

[0109] In addition to the above, examples include halogen-containing phosphate esters such as trischloroethyl phosphate, trisdichloropropyl phosphate, and tris(β-chloropropyl) phosphate, phosphazene compounds having a structure in which a phosphorus atom and a nitrogen atom are linked by a double bond, and phosphate ester amides.

[0110] Examples of silicon-containing flame retardants include organosilicon compounds with a two-dimensional or three-dimensional structure, polydimethylsiloxanes, and polydimethylsiloxanes in which the methyl groups on the side chains or ends are substituted or modified with hydrogen atoms, substituted or unsubstituted aliphatic hydrocarbon groups, or aromatic hydrocarbon groups, so-called silicone oils or modified silicone oils.

[0111] Examples of substituted or unsubstituted aliphatic hydrocarbon groups and aromatic hydrocarbon groups include alkyl groups, cycloalkyl groups, phenyl groups, benzyl groups, amino groups, epoxy groups, polyether groups, carboxyl groups, mercapto groups, chloroalkyl groups, alkyl higher alcohol ester groups, alcohol groups, aralkyl groups, vinyl groups, and trifluoromethyl groups.

[0112] Furthermore, as flame retardants other than the phosphorus-containing flame retardants and silicon-containing flame retardants, for example, inorganic flame retardants such as magnesium hydroxide, aluminum hydroxide, antimony trioxide, antimony pentoxide, sodium antimonate, zinc hydroxystannate, zinc stannate, metastannic acid, tin oxide, tin oxide salts, zinc sulfate, zinc oxide, ferrous oxide, ferric oxide, stannous oxide, stannic oxide, zinc borate, ammonium borate, ammonium octamolybdate, metal salts of tungstic acid, composite oxides of tungsten and metalloid, ammonium sulfamate, ammonium bromide, zirconium-based compounds, guanidine-based compounds, fluorine-based compounds, graphite, and expandable graphite can be used.

[0113] When the molding material contains a flame retardant, the content of the flame retardant can be 1 part by mass or more and 30 parts by mass or less, when the total content of the cellulose fiber and the specific cellulose derivative is 100 parts by mass.

[0114] This makes it possible to more effectively exhibit the effects of the present invention described above, while also making it possible to improve the flame retardancy of a molded article produced using the molding material of the present invention.

[0115] [1-5] Antioxidants The molding material of the present invention may further contain an antioxidant. This improves the resin's stability against heating during the kneading and molding processes.

[0116] Examples of antioxidants include phosphorus-based antioxidants and hindered phenol-based antioxidants (e.g., "Irganox 1010," "Irganox 1076," and "Irganox 3114" manufactured by Ciba Specialty Chemicals, and "Sumilizer GP" manufactured by Sumitomo Chemical Co., Ltd.).

[0117] When the molding material contains an antioxidant, the content of the antioxidant can be 0.05 parts by mass or more and 2.0 parts by mass or less when the total content of the cellulose fiber and the specific cellulose derivative is 100 parts by mass.

[0118] This makes it possible to more suitably improve scratch resistance and stain resistance while more suitably suppressing the deterioration of the impact resistance, moldability, rigidity, bending strength, heat resistance, etc., which are inherent to the specific cellulose derivative.

[0119] [1-6] Other ingredients The molding material of the present invention may contain components other than those described above. Hereinafter, in this section, such components will also be referred to as "other components."

[0120] Examples of other components include colorants, insect repellents, mildew inhibitors, antibacterial agents, antistatic agents, flame retardant assistants, ultraviolet absorbers, aggregation inhibitors, release agents, processing aids, anti-drip agents, cellulose derivatives other than the above-mentioned specific cellulose derivatives and cellulose ester resins, resin materials, and plasticizers.

[0121] However, the content of other components in the molding material of the present invention is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.

[0122] [2] Manufacturing method of molding material Next, a method for producing the molding material of the present invention will be described.

[0123] The molding material of the present invention can be produced, for example, by mixing the above-mentioned components. In this case, the timing of mixing the components may be the same or different.

[0124] The molding material of the present invention may be produced by kneading the above-mentioned components, for example. The components can be kneaded using, for example, a single-screw kneader, a twin-screw kneader, a multi-screw kneader, a mixer, or a roll Banbury mixer.

[0125] The strand-shaped molding material obtained by kneading may be pelletized using a pelletizer such as a strand type or a watering hot cut type to form a pellet-shaped molding material.

[0126] The following method may also be used as a method for producing a molding material. That is, a kneaded mixture of the above-mentioned components may be formed into a sheet, and then cut into a desired shape using, for example, a shredder to produce pellet-shaped molding material. The method for forming the kneaded mixture into a sheet is not particularly limited, but examples include a method in which the kneaded mixture is first deposited in air to form a sheet-like deposit, the deposit is compressed using a calendar device to remove air and increase density, and then heated in a heating furnace without contact, and then hot-pressed using a heat press. The shape and size of the pellets obtained by cutting are not particularly limited, but they can be, for example, approximately rectangular parallelepipeds with a side length of 2 mm to 5 mm.

[0127] The cellulose fibers used in the production of the molding material of the present invention may be those that have been previously subjected to a defibration treatment. In particular, cellulose fiber sources containing cellulose fibers, such as waste paper, may be defibrated.

[0128] [3] Molded body Next, the molded article of the present invention will be described.

[0129] The molded article of the present invention is made of a material containing the molding material of the present invention described above. In other words, the molded article of the present invention is made of a material containing cellulose fibers and a specific cellulose derivative in which some of the hydrogen atoms constituting the hydroxyl groups of cellulose are substituted with a first chemical structure that is a chemical structure of at least one of the general formulas (A) and (B) above, and other hydrogen atoms are substituted with a second chemical structure that is a chemical structure of the general formula (C) above. This makes it possible to provide a molded article having excellent strength and impact resistance.

[0130] Furthermore, since interfacial peeling between different components constituting the molded body can be suitably prevented or suppressed, problems such as dust generation can be effectively prevented.

[0131] Furthermore, the inclusion of cellulose fibers, which are naturally abundant and plant-derived materials, makes it possible to appropriately address environmental issues and conserve buried resources, and is also advantageous from the viewpoints of stable supply of molded products, cost reduction, etc. Furthermore, cellulose fibers are a component that is contained in large amounts not only in virgin pulp but also in waste paper, used cloth, etc., and is therefore advantageous from the viewpoint of promoting effective reuse of resources.

[0132] Furthermore, the specific cellulose derivatives can be suitably obtained from the above-mentioned cellulose as a raw material and are generally components with excellent biodegradability, which allows the molded article as a whole to suitably address environmental issues and the like.

[0133] Each component constituting the molded body preferably satisfies the conditions described above in [1-1] to [1-6].

[0134] The shape of the molded product is not particularly limited, and may be any shape, such as a sheet, a block, a sphere, or a three-dimensional shape.

[0135] The molded article may be used for any purpose, and examples thereof include various housings such as housings for printers, ink cartridges, various containers, and the like.

[0136] In particular, the molded body of the present invention has a high affinity between the cellulose fibers and the specific cellulose derivative, and dust generation is effectively prevented, making it suitable for use in ink cartridges and the like where dust generation is a particular problem.

[0137] [4] Manufacturing method for molded body Next, a method for producing the molded article of the present invention will be described.

[0138] The method for producing a molded article of the present invention includes a molding material preparation step of preparing the molding material of the present invention, and a heat molding step of heat molding the molding material. This makes it possible to suitably produce a molded article having excellent strength and impact resistance.

[0139] Furthermore, since interfacial peeling between different components constituting the molded body can be suitably prevented or suppressed, problems such as dust generation can be effectively prevented.

[0140] Furthermore, the inclusion of cellulose fibers, which are naturally abundant and plant-derived materials, makes it possible to appropriately address environmental issues and conserve buried resources, and is also advantageous from the viewpoints of stable supply of molded products, cost reduction, etc. Furthermore, cellulose fibers are a component that is contained in large amounts not only in virgin pulp but also in waste paper, used cloth, etc., and is therefore advantageous from the viewpoint of promoting effective reuse of resources.

[0141] Furthermore, the specific cellulose derivatives can be suitably obtained from the above-mentioned cellulose as a raw material and are generally components with excellent biodegradability, which allows the molded article as a whole to suitably address environmental issues and the like.

[0142] [4-1] Molding material preparation process In the molding material preparation step, the molding material of the present invention described above is prepared.

[0143] In this step, for example, the molding material of the present invention may be prepared by mixing a plurality of different compositions.

[0144] [4-2] Heat forming process In the heat molding step, the molding material of the present invention is heat molded.

[0145] The heating temperature in this step is not particularly limited, but is preferably 150°C or higher and 210°C or lower, and more preferably 170°C or higher and 190°C or lower.

[0146] This effectively prevents undesired denaturation, deterioration, etc. of the constituent components of the molding material, while improving the moldability in this process, and more reliably improving the dimensional accuracy, mechanical strength, etc. of the molded body produced.

[0147] Examples of molding methods in the heat molding step include injection molding, press molding, extrusion molding, etc. Also, a molding method using a so-called 3D printer can be applied.

[0148] [4-3] Other processes The method for producing a molded article of the present invention may further include other steps in addition to the molding material preparation step and the heat molding step described above. Such steps include a pre-treatment step, an intermediate treatment step, and a post-treatment step.

[0149] Examples of intermediate treatment steps include a step of mixing the molding material of the present invention with a composition other than the molding material of the present invention, and a step of mixing a plurality of types of molding materials of the present invention.

[0150] Examples of post-processing processes include processes in which the molded product obtained in the heat molding process is subjected to chemical treatment, mechanical processing, etc., and an assembly process in which the molded product obtained in the heat molding process is assembled with other components.

[0151] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these.

[0152] For example, the molded article of the present invention may be any article made of a material containing the molding material of the present invention, and is not limited to articles produced by the above-mentioned method. [Example]

[0153] Next, specific examples of the present invention will be described. [5] Synthesis of cellulose derivatives

[0154] (Synthesis Example 1) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, and 224 mg of lithium chloride, and the mixture was stirred at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 317 mg of sodium hydride (60% dispersion in liquid paraffin) was added, followed by stirring at room temperature for 3 hours. The internal temperature was cooled to below 0°C, and 0.98 g of 1-bromopropane was added dropwise, followed by stirring at room temperature for 16 hours. The reaction was quenched with 250 mL of water, and 1 N hydrochloric acid was added until the mixture was neutral, and the precipitate was filtered off.

[0155] The resulting solid and 25.4 mL of N-methyl-2-pyrrolidinone were added to a 200 mL three-neck flask and stirred for 1 hour. The internal temperature was cooled to below 0°C, and 777 mg of 4-(chlorocarbonyl)benzenesulfonic acid was added, followed by stirring at an internal temperature of 110°C for 20 hours. After cooling to room temperature, the reaction solution was added to 300 mL of water, and triethylamine was added until the pH reached 8 or higher. The precipitate was filtered and washed three times with 25 mL of water. The mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0156] (Synthesis Example 2) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, and 224 mg of lithium chloride, and the mixture was stirred at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 317 mg of sodium hydride (60% dispersion in liquid paraffin) was added, followed by stirring at room temperature for 3 hours. The internal temperature was cooled to below 0°C, and 1.45 g of 1-bromobutane was added dropwise, followed by stirring at room temperature for 16 hours. The reaction was quenched with 250 mL of water, and 1 N hydrochloric acid was added until the mixture was neutral, and the precipitate was filtered off.

[0157] The resulting solid and 25.4 mL of N-methyl-2-pyrrolidinone were added to a 200 mL three-neck flask and stirred for 1 hour. The internal temperature was cooled to below 0°C, and 777 mg of 4-(chlorocarbonyl)benzenesulfonic acid was added, followed by stirring at an internal temperature of 110°C for 20 hours. After cooling to room temperature, the reaction solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water.

[0158] The resulting solid, 300 mg of 1-Ethyl-3-methylimidazolium Acetate, and 25 mL of ethanol were added to a 200 mL three-neck flask and stirred for 1 hour. The solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water. The resulting mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0159] (Synthesis Examples 3 to 6, 10, and 14) A cellulose derivative was synthesized in the same manner as in Synthesis Example 2, except that the structure of the cellulose derivative was changed as shown in Figure 1 by changing the types and amounts of the components reacting with cellulose as a raw material.

[0160] (Synthesis Example 7) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, and 224 mg of lithium chloride, and the mixture was stirred at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 317 mg of sodium hydride (60% dispersion in liquid paraffin) was added, followed by stirring at room temperature for 3 hours. The internal temperature was cooled to below 0°C, and 1.09 g of 1-bromobutane was added, followed by stirring at room temperature for 16 hours. The internal temperature was further cooled to below 0°C, and 1.21 g of sodium chloromethanesulfonate was added, followed by stirring at room temperature for 16 hours. The reaction was quenched with 250 mL of water, and 1 N hydrochloric acid was added until the mixture was neutral. The precipitate was filtered and then washed three times with 25 mL of water.

[0161] The resulting solid, 300 mg of 1-Ethyl-3-methylimidazolium Acetate, and 25 mL of ethanol were added to a 200 mL three-neck flask and stirred for 1 hour. The solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water. The resulting mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0162] (Synthesis Examples 8, 9, 11 to 13) A cellulose derivative was synthesized in the same manner as in Synthesis Example 7, except that the structure of the cellulose derivative was changed as shown in Figure 1 by changing the types and amounts of the components reacting with cellulose as a raw material.

[0163] (Synthesis Example 15) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, 3.3 mL of pyridine, and 224 mg of lithium chloride, followed by stirring at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 977 mg of propanoic acid chloride was added. The mixture was stirred at an internal temperature of 110°C for 20 hours. The internal temperature was cooled to below 0°C, and 777 mg of 4-(chlorocarbonyl)benzenesulfonic acid was added. The mixture was stirred at an internal temperature of 110°C for 20 hours. The reaction solution was added to 300 mL of water, and triethylamine was added until the pH reached 8 or higher. The precipitate was then filtered and washed three times with 25 mL of water. The mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0164] (Synthesis Example 16) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, 3.3 mL of pyridine, and 224 mg of lithium chloride, followed by stirring at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 2.75 g of pentadecanoic acid chloride was added, followed by stirring at an internal temperature of 110°C for 20 hours. The internal temperature was cooled to below 0°C, and 777 mg of 4-(chlorocarbonyl)benzenesulfonic acid was added, followed by stirring at an internal temperature of 110°C for 20 hours. The reaction solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water.

[0165] The resulting solid, 300 mg of 1-Ethyl-3-methylimidazolium Acetate, and 25 mL of ethanol were added to a 200 mL three-neck flask and stirred for 1 hour. The solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water. The resulting mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0166] (Synthesis Examples 17-19, 22-26, 29) Cellulose derivatives were synthesized in the same manner as in Synthesis Example 16, except that the types and amounts of the reaction components with cellulose as a raw material were changed to produce the structures of the cellulose derivatives as shown in Figures 1 and 2.

[0167] (Synthesis Example 20) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, and 224 mg of lithium chloride, and the mixture was stirred at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 317 mg of sodium hydride (60% dispersion in liquid paraffin) was added, followed by stirring at room temperature for 3 hours. The internal temperature was cooled to below 0°C, and 325 mg of sodium 2-chloroethanesulfonate was added, followed by stirring at room temperature for 16 hours. The reaction was quenched with 250 mL of water, and 1 N hydrochloric acid was added until the mixture was neutral, and the precipitate was filtered off.

[0168] The resulting solid and 25.4 mL of N-methyl-2-pyrrolidinone were added to a 200 mL three-neck flask and stirred for 1 hour. The internal temperature was cooled to 0°C or below, and 1.69 g of butanoic acid chloride was added, followed by stirring at an internal temperature of 110°C for 20 hours. The mixture was cooled to room temperature, and the reaction solution was added to 300 mL of water. The precipitate was filtered and washed three times with 25 mL of water.

[0169] The resulting solid, 398 mg of N,N-Diethyl-N-methyl-N-(2-methoxyethyl)ammonium bromide, and 25 mL of ethanol were added to a 200 mL three-neck flask and stirred for 1 hour. The solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water. The product was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0170] (Synthesis Examples 21, 27, and 28) A cellulose derivative was synthesized in the same manner as in Synthesis Example 20, except that the structure of the cellulose derivative was changed as shown in Figure 2 by changing the types and amounts of the components reacting with cellulose as a raw material.

[0171] (Synthesis Example 30) A 200 mL three-neck flask was charged with 1.90 g of cellulose (Nippon Paper KC Flock W50), 25.4 mL of N-methyl-2-pyrrolidinone, and 224 mg of lithium chloride, and the mixture was stirred at 60°C for 8 hours. The internal temperature was cooled to below 0°C, and 1.75 g of 4-(chlorocarbonyl)benzenesulfonic acid was added, followed by stirring at an internal temperature of 110°C for 20 hours. The mixture was cooled to room temperature, and the reaction solution was added to 300 mL of water. The precipitate was filtered and washed three times with 25 mL of water.

[0172] The resulting solid, 300 mg of 1-Ethyl-3-methylimidazolium Acetate, and 25 mL of ethanol were added to a 200 mL three-neck flask and stirred for 1 hour. The solution was added to 300 mL of water, and the precipitate was filtered and washed three times with 25 mL of water. The resulting mixture was freeze-dried for 72 hours to obtain the desired cellulose derivative.

[0173] The conditions for synthesizing the cellulose derivatives in each synthesis example are summarized in Figures 1 and 2. In Figures 1 and 2, the cationic chemical structure represented by the following formula (5) is indicated as "Formula (5)," the cationic chemical structure represented by the above formula (6) is indicated as "Formula (6)," the cationic chemical structure represented by the above formula (7) is indicated as "Formula (7)," the cationic chemical structure represented by the above formula (8) is indicated as "Formula (8)," the cationic chemical structure represented by the above formula (9) is indicated as "Formula (9)," the cationic chemical structure represented by the above formula (10) is indicated as "Formula (10)," the cationic chemical structure represented by the above formula (11) is indicated as "Formula (11)," and the cationic chemical structure represented by the above formula (12) is indicated as "Formula (12)." Furthermore, the cellulose derivatives obtained in each synthesis example all had number-average molecular weights in the range of 10,000 to 400,000.

[0174] [ka]

[0175] [6] Preparation of molding material Example 1 The following were weighed: 50 parts by mass of cellulose fiber (manufactured by CMPC, Guaiba BEKP), 20 parts by mass of the cellulose derivative synthesized in Synthesis Example 1, 30 parts by mass of cellulose acetate propionate (manufactured by Eastman Chemical Co., CAP-482-20), 10 parts by mass of triphenyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) as a flame retardant, and 0.5 parts by mass of Irganox (registered trademark) 1010 (manufactured by BASF) as an antioxidant. These were then charged into a twin-screw kneader (manufactured by Technovel Co., Ltd., KZW15TW-45MG) and kneaded. The kneading conditions were a maximum heating temperature of 180°C and an extrusion discharge rate of 1 kg / hr. The strands were then processed into strands and pelletized into a molding material in a pelletizer.

[0176] Examples 2 to 29 Pellets of molding material were prepared in the same manner as in Example 1, except that the types of components to be kneaded and the compounding ratio of each component were changed as shown in FIGS.

[0177] (Comparative Examples 1 to 6) A pellet-shaped molding material was prepared in the same manner as in Example 1, except that the types of components to be kneaded and the compounding ratio of each component were changed as shown in FIG.

[0178] [7] Manufacturing of molded bodies The molding materials of each of the examples and comparative examples were injection molded using an injection molding machine (THX40-5V, manufactured by Nissei Plastic Industrial Co., Ltd.) to produce molded articles for evaluating flexural modulus, flexural strength, and Charpy impact strength, as described below. The heating temperature of the molding materials during injection molding was 200°C. The molded articles for evaluating flexural modulus and flexural strength were rectangular plate-shaped molded articles with long sides of 80 mm ± 2 mm, short sides of 10.0 mm ± 0.2 mm, and thicknesses of 4.0 mm ± 0.2 mm. The molded article for evaluating Charpy impact strength was a rectangular plate-shaped molded article with long sides of 80 mm ± 2 mm, short sides of 4.0 mm ± 0.2 mm, and thicknesses of 10.0 mm ± 0.2 mm.

[0179] [8] Evaluation The molded articles according to the above-mentioned Examples and Comparative Examples were evaluated as follows.

[0180] [8-1] Flexural modulus The flexural modulus of each molded article for evaluating the flexural modulus of each of the Examples and Comparative Examples, which was produced as described in [7] above, was measured using an Instron 68TM-30 in accordance with ISO 178 (JIS K7171), and evaluated according to the following criteria: The distance between supports was 64 mm in the measurement of the flexural modulus.

[0181] A: The flexural modulus is 2.0 GPa or more. B: The flexural modulus is 1.5 GPa or more and less than 2.0 GPa. C: The flexural modulus is 1.0 GPa or more and less than 1.5 GPa. D: The flexural modulus is less than 1.0 GPa.

[0182] [8-2] Bending strength The flexural strength of each molded article for evaluation of flexural strength according to the examples and comparative examples, which were produced as described in [7] above, was measured using an Instron 68TM-30 in accordance with ISO 178 (JIS K7171), and evaluated according to the following criteria: The flexural strength was measured with a support distance of 64 mm.

[0183] A: The bending strength is 60 MPa or more. B: The bending strength is 40 MPa or more and less than 60 MPa. C: The bending strength is 20 MPa or more and less than 40 MPa. D: The bending strength is less than 20 MPa.

[0184] [8-3] Charpy impact strength The Charpy impact strength of each of the molded articles for Charpy impact strength evaluation according to each of the Examples and Comparative Examples, which were produced as described in [7] above, was measured in accordance with ISO 179 (JIS K7111) using an Impact Tester IT manufactured by Toyo Seiki Seisaku-sho, Ltd., and evaluated according to the following criteria: The hammer weight was 4J (WR 2.14 N / m), the lifting angle was 150°, the remaining notch width was 8.0 mm ± 0.2 mm, and the notch angle was 45°.

[0185] A: Charpy impact strength is 10kJ / m 2 That's all. B: Charpy impact strength is 8kJ / m 2 More than 10kJ / m 2 is less than. C: Charpy impact strength is 6kJ / m 2 More than 8kJ / m 2 is less than. D: Charpy impact strength is 6kJ / m 2 is less than.

[0186] [8-4] Melt flow rate The melt flow rate of each molding material in each of the Examples and Comparative Examples was determined by measuring at 190°C and a load of 21.2 N in accordance with ISO 1133, and evaluated according to the following criteria: The higher the melt flow rate, the better the moldability.

[0187] A: The melt flow rate is 20g / 10min or more. B: The melt flow rate is 10 g / 10 min or more and less than 20 g / 10 min. C: The melt flow rate is 5 g / 10 min or more and less than 10 g / 10 min. D: The melt flow rate is less than 5 g / 10 min.

[0188] These results are shown together in FIGS. 3 and 4, along with the compositions of the molding materials obtained in the above-mentioned Examples and Comparative Examples.

[0189] In Figures 3 and 4, cellulose fiber (CMPC, Guaiba BEKP) is referred to as "cellulose fiber," cellulose acetate propionate (Eastman Chemical Co., CAP-482-20) as "CAP," cellulose acetate butyrate (Eastman Chemical Co., CAB-381-20) as "CAB," cellulose acetate (Daicel Millize, DAC:L-70) as "DAC," ethyl cellulose (Fujifilm Wako Pure Chemical Industries, Ethyl Cellulose (approximately 49% ethoxy) 100) as "EC," triphenyl phosphate (Daihachi Chemical Industry Co., Ltd.) as "flame retardant," Irganox (registered trademark) 1010 (BASF) as "antioxidant," and melt flow rate as "MFR." The numerical values for each component in Figures 3 and 4 indicate the content in parts by mass.

[0190] As is clear from Figures 3 and 4, excellent results were obtained in each of the Examples, whereas satisfactory results were not obtained in each of the Comparative Examples.

Claims

1. Cellulose fibers, and a specific cellulose derivative in which some of the hydrogen atoms constituting the hydroxyl groups of cellulose are substituted with a first chemical structure which is a chemical structure of at least one of the following general formulas (A) and (B), and other hydrogen atoms are substituted with a second chemical structure which is a chemical structure of the following general formula (C). 【Chemical 1】 (In formula (A), R Ａ is a monovalent hydrocarbon group having 1 to 8 carbon atoms. 【Chemistry 2】 (In formula (B), R Ｂ is a monovalent hydrocarbon group having 1 to 14 carbon atoms. 【Chemistry 3】 (In formula (C), n is 0 or 1, m is an integer of 0 to 4, l is 0 or 1, and R Ｃ ＋ is a cationic chemical structure.)

2. The R Ｃ ＋ The molding material according to claim 1, wherein is at least one of the following formulas (6) to (12): 【Chemistry 4】 (In formula (6), n is an integer of 1 or more and 18 or less.) 【Chemistry 5】 (In formula (7), n is an integer of 1 or more and 18 or less.) 【Chemistry 6】 (In formula (8), n is an integer of 1 or more and 18 or less.) 【Chemistry 7】 (In formula (9), n is an integer of 1 or more and 18 or less.) 【Chemistry 8】 (In formula (10), n is an integer of 1 or more and 18 or less.) 【Chemistry 9】 (In formula (11), n is an integer of 1 or more and 18 or less.) 【Chemistry 10】

3. The content of the cellulose fiber in the molding material is 35% by mass or more and 80% by mass or less, and The molding material according to claim 1 or 2, wherein the content of the specific cellulose derivative in the molding material is 4% by mass or more and 50% by mass or less.

4. The R Ａ The molding material according to claim 1 or 2, wherein is an alkyl group having 1 to 6 carbon atoms.

5. The R Ｂ The molding material according to claim 1 or 2, wherein is an alkyl group or an aryl group having 1 to 12 carbon atoms.

6. Regarding the specific cellulose derivative, the DS value of the first chemical structure is 1.2 or more and 2.5 or less; The DS value of the second chemical structure is 0.1 or more and 1.6 or less, and The molding material according to claim 1 or 2, wherein the sum of the DS value of the first chemical structure and the DS value of the second chemical structure is 2.0 or more and 3.0 or less.

7. The molding material further contains, in addition to the cellulose fibers and the specific cellulose derivative, a cellulose ester resin in which at least a portion of hydroxyl groups of cellulose are esterified, 3. The molding material according to claim 1, wherein the cellulose ester resin has a structure in which an alkyl group having 1 to 18 carbon atoms is bonded to an ester group.

8. A molded article made of a material containing the molding material according to claim 1.

9. a molding material preparation step of preparing the molding material according to claim 1; and a heat molding step of heat molding the molding material.

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