Biomass-based resin

Abstract

To manufacture a biomass-based resin that satisfies both of elastic modulus and extension.SOLUTION: A composite material contains (A) bioplastic and (B) an organic material having three or more glycidyl ethers in a molecule.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a biomass-based resin. [Background technology]

[0002] Non-patent document 1 discloses that bioplastics are desirable in terms of both reducing greenhouse gas emissions and fossil resource usage, and addressing the microplastic and waste issues.

[0003] Non-Patent Document 2 discloses that polylactic acid has a high elastic modulus but low impact strength and low tensile elongation. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Challenges and future prospects for biodegradable plastics; Mitsubishi Research Institute Technical Report (2019) [Non-patent document 2] PIONEER R&D Vol.16 No.1, 33-39 (2006) Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to produce a composite material containing a biomass-based resin that has both elastic modulus and elongation. [Means for solving the problem]

[0006] The present invention encompasses composite materials containing the following biomass-based resins:

[0007] Section 1. A composite material comprising: (A) a bioplastic; (B) an organic material having three or more glycidyl ethers in the molecule;

[0008] Section 2. Item 2. The composite material according to item 1, wherein the (B) organic material is an organic material having a sugar alcohol structure.

[0009] Section 3. Item 3. The composite material according to item 2, wherein the sugar alcohol is at least one sugar alcohol selected from the group consisting of glycerin, erythritol, threitol, arabinitol, xylitol, ribitol, iditol, galactitol, sorbitol, mannitol, volemitol, perseitol, and lactitol.

[0010] Section 4. 3. The composite material according to Item 2, wherein the (B) organic material is an organic material having a fatty acid structure in addition to a sugar alcohol.

[0011] Section 5. Item 2. The composite material according to Item 1, wherein the (B) organic material is at least one organic material selected from the group consisting of epoxidized oil, glycerin polyglycidyl ether, diglycerin polyglycidyl ether, triglycerin polyglycidyl ether, tetraglycerin polyglycidyl ether, and polyglycerin polyglycidyl ether.

[0012] Section 6. The (B) organic material is It is a glycidyl ether having a glycerin structure, The epoxy equivalent is an organic material of 100g / eq. or more and 250g / eq. or less. Item 1. The composite material according to item 1.

[0013] Section 7. The (B) organic material is an epoxidized oil, and The organic material contains 6.0% or more and 10% or less of oxirane oxygen. Item 1. The composite material according to item 1.

[0014] Section 8. Item 2. The composite material according to item 1, wherein the (A) bioplastic is polylactic acid.

[0015] Section 9. In composite materials, The content ratio of the (A) bioplastic and the (B) organic material is As a mass ratio, (A) Bioplastic:(B) Organic material = 99:1 to 70:30 Item 1. The composite material according to item 1.

[0016] Section 10. The (A) bioplastic is The melt flow rate (MFR) at 190°C is 3g / 10min. to 30g / 10min. Item 1. The composite material according to item 1.

[0017] Section 11. The (A) bioplastic is Item 1. The composite material according to item 1, having a melting point of 125°C to 180°C.

[0018] Section 12. The elastic modulus of the composite material is The elastic modulus of the (A) bioplastic is 0.8 to 1.1 times that of the (A) bioplastic alone. Item 1. The composite material according to item 1.

[0019] Section 13. Composite Materials The tensile modulus is 800 MPa or more, Item 1. The composite material according to item 1, wherein the tensile elongation is 100% or more.

[0020] Section 14. Item 1. The composite material according to item 1, further comprising (C) cellulose.

[0021] Section 15. In composite materials, The content ratio of the (C) cellulose is 10% by mass to 60% by mass. Item 15. The composite material according to item 14.

[0022] Section 16. In composite materials, Item 15. The composite material according to item 14, wherein the content of the (B) organic material is 3% by mass to 15% by mass with respect to the content of the (C) cellulose.

[0023] Section 17. The (A) bioplastic is Item 15. The composite material according to item 14, which is polylactic acid and has an optical purity (L-isomer ratio) of 98% or more.

[0024] Section 18. The (A) bioplastic is Item 15. The composite material according to item 14, which is polylactic acid and has a melting point of 169°C to 180°C.

[0025] Section 19. Item 1. The composite material according to item 1, further comprising (D) a fatty acid amide.

[0026] Section 20. 1. A method for producing a composite material, comprising: (A) a bioplastic; (B) an organic material having three or more glycidyl ethers in the molecule; kneading the above (1) A method for producing a composite material, wherein the maximum cylinder temperature during kneading is 160°C to 220°C.

[0027] Section 21. 1. A method for producing a composite material, comprising: (A) a bioplastic; (B) an organic material having three or more glycidyl ethers in the molecule; kneading the above (2) A method for producing a composite material, wherein the cylinder temperature during kneading is a minimum of 150°C to 200°C.

[0028] Section 22. In the kneading step, (3) The peripheral speed V of the screw during kneading is 0.3 m / s or more when expressed by the following formula: 22. A method for producing the composite material according to claim 20 or 21. Screw peripheral speed V (m / s) = D x N x π / 60,000 Screw rotor diameter: D (mm) Screw rotation speed: N (min -1 )

[0029] The present invention makes it possible to provide a resin composite material that uses biodegradable biomass raw materials and that has both a high elastic modulus and high elongation. [Effects of the Invention]

[0030] The present invention makes it possible to provide a resin composite material that uses biodegradable biomass raw materials and that has both a high elastic modulus and high elongation. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention will be described in detail below.

[0032] The embodiments of the present invention are intended to provide a better understanding of the gist of the invention, and unless otherwise specified, do not limit the content of the invention.

[0033] In this specification, the terms "comprise" and "contain" are concepts that encompass all of "comprise," "consist essentially of," and "consist only of."

[0034] In this specification, when a numerical range is expressed as "A to B," it means "not less than A and not more than B."

[0035] In this specification, the expressions parts, % and the like are generally used.

[0036] In this specification, unless otherwise specified, all parts by mass or % by mass (wt%) are used.

[0037] [1] Biomass-based resin There is a desire to reduce greenhouse gas emissions, reduce the use of fossil resources, and solve the problem of microplastic waste, and attempts are being made to use bioplastics.

[0038] Bioplastics is a general term for plastics made from biomass (plants and microorganisms) and biodegradable plastics (in this specification, they will be referred to as "biomass-based resins," "bioplastics," or "biopla").

[0039] On the other hand, bioplastics with a high elastic modulus tend to have poor elongation and impact strength, while those with high elongation and impact strength tend to have a low elastic modulus and be soft. For example, polylactic acid is known to have a high elastic modulus but poor impact strength and low tensile elongation.

[0040] The inventors have made it possible to produce a bioplastic that combines elastic modulus and elongation by combining a bioplastic such as polylactic acid with a material having three or more glycidyl ether groups in its molecule.

[0041] The composite material of the present invention comprises: (A) Bioplastics (biomass-based resins), (B) an organic material having three or more glycidyl ethers (epoxy groups) in the molecule; Contains:

[0042] The composite material of the present invention may further contain cellulose.

[0043] (1-1)(A) Bioplastics (biomass-based resins) The composite material of the present invention contains (A) a bioplastic (biomass-based resin).

[0044] (A) Bioplastic is preferably polylactic acid. (A) Bioplastic may be other biomass resins (including non-biodegradable resins) or biodegradable resins (including non-biomass-derived resins), or may be a mixture of these.

[0045] The (A) bioplastic is preferably polylactic acid (PLA), and is polylactic acid with an optical purity (L-isomer ratio) of 98% or more.

[0046] The (A) bioplastic preferably has a melting point of 125°C to 180°C. The (A) bioplastic is preferably polylactic acid, and is a polylactic acid having a melting point of 169°C to 180°C.

[0047] (A) Bioplastic is preferably polyglycolic acid, polyhydroxybutyrate, polybutylene succinate, polyethylene succinate, polyamide 4, polyamide 11, biomass-derived polyethylene, biomass-derived polypropylene, copolymers thereof, etc. (A) Bioplastic may also be a resin that is chemically modified with a biomass material as the main component, such as cellulose acetate.

[0048] (A) Bioplastic may be added to other bioplastics either alone or in combination of two or more.

[0049] (A) Bioplastic is preferably biodegradable from the viewpoint of biodegradation or biogas production. (A) Bioplastic is preferably non-biodegradable from the viewpoint of long-term durability.

[0050] The (A) bioplastic preferably has a melt flow rate (MFR) at 190°C of 3 g / 10 min. to 30 g / 10 min.

[0051] (1-2)(B) Organic materials having three or more glycidyl ethers in the molecule The composite material of the present invention contains (B) an organic material having three or more glycidyl ethers (epoxy groups) in the molecule.

[0052] (B) The organic material has three or more glycidyl ethers in its molecule, and the presence of three or more glycidyl ethers allows it to react with the ends of (A) the bioplastic to form a crosslinked structure, and the composite material maintains its elastic modulus while improving its tensile elongation, impact strength, etc.

[0053] It is desirable for the organic material to have a sugar alcohol structure. By having a flexible sugar alcohol structure, it is easy to achieve both tensile elongation, impact strength, and elastic modulus.

[0054] The (B) organic material is preferably an organic material having a sugar alcohol structure. Any sugar alcohol can be used. The sugar alcohol is preferably at least one sugar alcohol selected from the group consisting of glycerin, erythritol, threitol, arabinitol, xylitol, ribitol, iditol, galactitol, sorbitol, mannitol, volemitol, perseitol, and lactitol.

[0055] The sugar alcohol is preferably a sugar alcohol having a flexible and minimal glycerin structure, and from the viewpoint of maintaining elastic modulus, is preferably at least one organic material selected from the group consisting of glycerin polyglycidyl ether, diglycerin polyglycidyl ether, triglycerin polyglycidyl ether, tetraglycerin polyglycidyl ether, and polyglycerin polyglycidyl ether.

[0056] The (B) organic material is preferably an organic material having a fatty acid structure in addition to a sugar alcohol. The (B) organic material is preferably an epoxidized oil. A material having a fatty acid structure in addition to a sugar alcohol structure may also be used. In this case, an epoxidized oil in which a glycidyl ether structure is formed by oxidizing the double bond of the fatty acid can be used. The epoxidized oil is preferably epoxidized soybean oil or epoxidized linseed oil.

[0057] The (B) organic material is preferably a glycidyl ether having a glycerin structure, and is an organic material having an epoxy equivalent of 100 g / eq. or more and 250 g / eq. or less.

[0058] With an epoxy equivalent of 100g / eq or more, the epoxy equivalent is high and the epoxy density is low, so the composite material does not become rigid and has excellent elongation and impact strength.With an epoxy equivalent of 250g / eq or less, the epoxy equivalent is low and the epoxy density is high, so the composite material has a high crosslink density and maintains an excellent elastic modulus.

[0059] (B) When the organic material is an epoxidized oil, the epoxy equivalent can be calculated, and generally, the oxirane oxygen, which represents the oxygen ratio of the glycidyl ether, is used.

[0060] The (B) organic material is preferably an epoxidized oil and an organic material having oxirane oxygen of 6.0% or more and 10% or less.

[0061] In the composite material, the content ratio of the (A) bioplastic to the (B) organic material is preferably, in terms of mass ratio, (A) Bioplastic: (B) Organic material = 99:1 to 70:30.

[0062] (1-3)(C) Cellulose The composite material of the present invention may further contain (C) cellulose.

[0063] (C) Cellulose derived from broad-leaved trees, coniferous trees, herbaceous plants, cotton, microorganisms, etc. can be used.

[0064] (C) Any cellulose can be used, and it may contain other components such as hemicellulose, lignin, and inorganic substances. The more hemicellulose there is, the more flexible the material may be. If there is too much hemicellulose, the strength tends to decrease. If lignin is included, the strength may increase. If lignin is included, it is inevitable that the material will turn dark brown during kneading and molding.

[0065] (C) Cellulose is added when strength and elastic modulus are desired, rather than flexibility.

[0066] The content of (C) cellulose in the composite material is adjusted depending on the purpose, and is preferably adjusted to 10% by mass to 60% by mass of the total weight of the composite material.

[0067] By adjusting the content of (C) cellulose to 10% by mass or more of the total weight of the composite material, the composite material can maintain its elastic modulus and strength well. By adjusting the content of (C) cellulose to 60% by mass or less of the total weight of the composite material, the viscosity does not become too high, and the composite material can be kneaded and molded well.

[0068] In the composite material of the present invention, (C) cellulose is not an essential component. When (C) cellulose is used to adjust the elastic modulus, it may be added in an amount of less than 10 mass% of the total weight of the composite material, and when cellulose nanofibers are used, the composite material will have sufficient strength when the amount of (C) cellulose is 1 mass% to 30 mass% of the total weight of the composite material. When producing a film using the composite material of the present invention, if the amount of (C) cellulose is too large, it tends to be difficult to form a film.

[0069] (C) The longer the cellulose fiber, the stronger it is. (C) The shorter the cellulose fiber, the lower the viscosity and the easier it is to process.

[0070] (C) The higher the degree of polymerization of cellulose, the greater the strength. Preferably, cellulose with a degree of polymerization of 300 or more is used.

[0071] In the composite material, the mass of the (B) organic material having three or more glycidyl ether groups in its molecule relative to the content (mass) of the (C) cellulose (the mass % of the (B) organic material having three or more glycidyl ether groups in its molecule when the (C) cellulose is taken as 100 mass %) is preferably 3 mass % to 15 mass %. By adjusting the mass ratio of the (B) organic material having three or more glycidyl ether groups in its molecule relative to the mass of the (C) cellulose to an appropriate ratio, the tensile strength and flexural strength of the composite material can be maximized.

[0072] When the impact strength of the composite material is important, it is preferable to increase the content of (B) the organic material having three or more glycidyl ether groups in the molecule in the composite material. If the content of (B) the organic material having three or more glycidyl ether groups in the molecule in the composite material is increased, the tensile strength and flexural strength of the composite material will decrease.

[0073] The elastic modulus of the composite material is preferably 0.8 to 1.1 times the elastic modulus of the (A) bioplastic alone.

[0074] The tensile modulus of the composite material is preferably 800 MPa or more.

[0075] The tensile elongation of the composite material is preferably 100% or greater.

[0076] (1-4)(D) Fatty acid amides The composite material of the present invention may further contain (D) a fatty acid amide.

[0077] Although the fatty acid amide (D) is not an essential component of the composite material of the present invention, the addition of the fatty acid amide (D) improves the mold releasability and blocking resistance of the composite material of the present invention.

[0078] When the composite material of the present invention contains (C) cellulose, (D) fatty acid amide does not need to be added. Fatty acid amide is preferably added for the purpose of preventing blocking of the (soft) film and improving mold releasability. When a film contains (C) cellulose, it acts to prevent blocking of the film, so (D) fatty acid amide may be added as needed.

[0079] When the composite material of the present invention contains (D) a fatty acid amide, (C) cellulose may not be added.

[0080] [2] Manufacturing methods for composite materials The method for producing a composite material of the present invention includes the steps of: (A) a bioplastic; (B) an organic material having three or more glycidyl ethers in the molecule; kneading the above mixture; (1) The maximum cylinder temperature during kneading is 160°C to 220°C.

[0081] The method for producing a composite material of the present invention includes the steps of: (A) a bioplastic; (B) an organic material having three or more glycidyl ethers in the molecule; kneading the above mixture; (2) The minimum cylinder temperature during kneading is 150°C to 200°C.

[0082] The method for producing a composite material of the present invention includes the steps of: (A) a bioplastic; (B) When kneading with an organic material having three or more glycidyl ethers in the molecule, Additionally, (C) cellulose, and / or Additionally, (D) fatty acid amides may be added and kneaded.

[0083] The kneading step is preferably carried out using a twin-screw kneader, a kneader, a roll mill, a super mixer, or the like, and more preferably carried out using a twin-screw kneader.

[0084] In the kneading step, the maximum cylinder temperature during kneading using a twin-screw kneader is preferably 160°C to 220°C. By setting the maximum cylinder temperature to 160°C or higher, (A) bioplastic (resin) and (B) organic material having three or more glycidyl ether groups in the molecule are sufficiently crosslinked. By setting the maximum cylinder temperature to 220°C or lower, (A) bioplastic and (B) organic material having three or more glycidyl ether groups in the molecule do not decompose, the composite material maintains its strength, and blocking of (A) bioplastic (resin) and the composite material (molded product) can be suppressed.

[0085] In the kneading step, the minimum cylinder temperature during kneading using a twin-screw kneader is preferably 150°C to 200°C. By setting the minimum cylinder temperature to 150°C or higher, (A) bioplastic (resin) and (B) organic material having three or more glycidyl ether groups in the molecule are sufficiently crosslinked. By setting the minimum cylinder temperature to 200°C or lower, (A) bioplastic and (B) organic material having three or more glycidyl ether groups in the molecule do not decompose, the composite material maintains its strength, and blocking of (A) bioplastic (resin) and the composite material (molded product) can be suppressed.

[0086] In the method for producing a composite material of the present invention, the cylinder temperature during kneading is an important feature, particularly in systems that do not contain cellulose (C). By setting the cylinder temperature during kneading, it is possible to suppress the bleeding out of organic materials from the kneaded product (composite material). .

[0087] The method for producing a composite material of the present invention includes the steps of: (A) a bioplastic; (B) When kneading with an organic material having three or more glycidyl ethers in the molecule, In particular, in systems in which (C) cellulose is not added, the kneading temperature is particularly important.

[0088] Polylactic acid (PLA) is prone to hydrolysis, so a lower mixing temperature is preferable. However, when a large amount of organic components are mixed into the PLA-containing reaction system (material to be mixed), mixing at an appropriate temperature range is important because too low a mixing temperature can result in insufficient compatibility of the components, while too high a mixing temperature can cause hydrolysis of the resin and bleeding out of the components. This method can also be applied to systems containing cellulose that do not contain many organic components in the reaction system.

[0089] In the method for producing a composite material of the present invention, the kneading step preferably includes: (3) The peripheral speed V of the screw during kneading is 0.3 m / s or more when expressed by the following formula. Screw peripheral speed V (m / s) = D x N x π / 60,000 Screw rotor diameter: D (mm) Screw rotation speed: N (min -1 )

[0090] The peripheral speed V of the screw during kneading is preferably set to 0.3 m / s or more.

[0091] The present invention makes it possible to provide a resin composite material that uses biodegradable biomass raw materials and that has both a high elastic modulus and high elongation.

[0092] The present invention can be implemented in various forms without departing from the gist of the present invention. [Example]

[0093] The present invention will be specifically described below with reference to examples.

[0094] The present invention is not limited to the following specific examples.

[0095] (1) Example of a composite material containing (A) a bioplastic and (B) an organic material having three or more glycidyl ethers in its molecule (MFR of PLA: 3g / 10min.) Example 1 170 g of polylactic acid (PLA) (melting point 155°C, MFR 3 g / 10 min.) and 30 g of epoxidized linseed oil (oxirane oxygen (%) 8.5 or more) were mixed in a twin-screw mixer to produce pellets. The resulting pellets were injection molded to obtain translucent molded products.

[0096] The molded product had a tensile modulus of 1,000 MPa and a tensile elongation of 397%.

[0097] Example 2 170 g of polylactic acid (melting point 155°C, MFR 3 g / 10 min.) and 30 g of tetraglycerin polyglycidyl ether were kneaded in a twin-screw kneader to prepare pellets. The obtained pellets were injection molded to obtain a translucent molded product.

[0098] The molded product had a tensile modulus of 967 MPa and a tensile elongation of 434%.

[0099] (Comparative Example 1, (B) Example not including an organic material having three or more glycidyl ethers in the molecule) 200 g of polylactic acid (PLA) (melting point 155°C, MFR 3 g / 10 min.) was kneaded in a twin-screw kneader to prepare pellets, which were then injection molded to obtain a nearly transparent molded product.

[0100] The molded product had a tensile modulus of 1,085 MPa and a tensile elongation of 10%.

[0101] The molded product of Comparative Example 1 had an elastic modulus equal to or less than those of the molded products of Examples 1 and 2, and was inferior in tensile strength.

[0102] (Comparative Example 2, (B) Example not including an organic material having three or more glycidyl ethers in the molecule) 170 g of polylactic acid (PLA) (melting point 155°C, MFR 3 g / 10 min.) and 30 g of polyethylene glycol diglycidyl ether were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a nearly transparent molded product.

[0103] The molded product had a tensile modulus of elasticity of 7.4 MPa and a tensile elongation of 379%.

[0104] The molded product of Comparative Example 2 was inferior to the molded products of Examples 1 and 2 in modulus of elasticity and tensile strength.

[0105] (2) Examples of composite materials containing (A) bioplastics, (B) organic materials with three or more glycidyl ethers in the molecule, and (C) cellulose (MFR of PLA: 3g / 10min.) Example 3 139.4 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 0.6 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0106] The molded product had a tensile modulus of 1,881 MPa and a tensile strength of 82.7 MPa.

[0107] Example 4 138.2 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 1.8 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0108] The tensile modulus of the molded product was 1,868 MPa and the tensile strength was 88.5 MPa.

[0109] Example 5 137.0 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 3.0 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The obtained pellets were injection molded to obtain a white molded product.

[0110] The molded product had a tensile modulus of 1,973 MPa and a tensile strength of 96.9 MPa.

[0111] Example 6 135.8 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 4.2 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0112] The tensile modulus of the molded product was 2,018 MPa and the tensile strength was 81.1 MPa.

[0113] Example 7 134.6 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 5.4 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0114] The tensile modulus of the molded product was 1,909 MPa and the tensile strength was 81.8 MPa.

[0115] Example 8 133.4 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 6.6 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0116] The tensile modulus of the molded product was 1,814 MPa and the tensile strength was 79.0 MPa.

[0117] (Comparative Example 3, (B) Example of not including an organic material having three or more glycidyl ethers in the molecule) 140 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.) and 60 g of cellulose were kneaded in a twin-screw kneader to prepare pellets, which were then injection molded to obtain a white molded product.

[0118] The tensile modulus of the molded product was 1,818 MPa and the tensile strength was 71.8 MPa.

[0119] The molded product of Comparative Example 3 had an elastic modulus equal to or less than those of the molded products of Examples 3 to 8, and was inferior in tensile strength.

[0120] (Comparative Example 4, (B) Example of not including an organic material having three or more glycidyl ethers in the molecule) 138.2 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 3.0 g of linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0121] The molded product had a tensile modulus of 1,785 MPa and a tensile strength of 66.1 MPa.

[0122] The molded product of Comparative Example 4 was inferior to the molded products of Examples 3-8 in modulus of elasticity and tensile strength.

[0123] (Comparative Example 5, (B) Example of not including an organic material having three or more glycidyl ethers in the molecule) 138.2 g of polylactic acid (melting point 175°C, MFR 3 g / 10 min.), 60 g of cellulose, and 3.0 g of tung oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0124] The tensile modulus of the molded product was 1,685 MPa and the tensile strength was 67.8 MPa.

[0125] The molded product of Comparative Example 5 was inferior to the molded products of Examples 3-8 in modulus of elasticity and tensile strength.

[0126] (3) Examples of composite materials containing (A) bioplastics, (B) organic materials with three or more glycidyl ethers in the molecule, and (C) cellulose (PLA MFR: 30g / 10min.) Example 9 137.0 g of polylactic acid (melting point 175°C, MFR 30 g / 10 min), 60 g of cellulose, and 3.0 g of epoxidized linseed oil were mixed in a twin-screw mixer to prepare pellets. The resulting pellets were injection molded to obtain a white molded product.

[0127] The molded product had a tensile modulus of elasticity of 2,050 MPa and a tensile strength of 78.5 MPa.

[0128] (Comparative Example 6, (B) Example of not including an organic material having three or more glycidyl ethers in the molecule) 140 g of polylactic acid (melting point 175°C, MFR 30 g / 10 min.) and 60 g of cellulose were kneaded in a twin-screw kneader to prepare pellets. The obtained pellets were injection molded to obtain a white molded product.

[0129] The tensile modulus of the molded product was 1,822 MPa and the tensile strength was 68.0 MPa.

[0130] The molded product of Comparative Example 6 had an elastic modulus equal to or less than that of the molded product of Example 9, and was inferior in tensile strength.

[0131] [Industrial Applicability] The present invention makes it possible to produce a bioplastic that has both elastic modulus and elongation by combining a bioplastic such as polylactic acid with a material having three or more glycidyl ether groups in its molecule.

Claims

1. A composite material comprising: (A) bioplastics; (B) an organic material having three or more glycidyl ethers in its molecule; A composite material comprising:

2. 2. The composite material according to claim 1, wherein the organic material (B) is an organic material having a sugar alcohol structure.

3. 3. The composite material of claim 2, wherein the sugar alcohol is at least one sugar alcohol selected from the group consisting of glycerin, erythritol, threitol, arabinitol, xylitol, ribitol, iditol, galactitol, sorbitol, mannitol, volemitol, perseitol, and lactitol.

4. 3. The composite material according to claim 2, wherein the (B) organic material is an organic material having a fatty acid structure in addition to a sugar alcohol.

5. 2. The composite material according to claim 1, wherein the (B) organic material is at least one organic material selected from the group consisting of epoxidized oil, glycerin polyglycidyl ether, diglycerin polyglycidyl ether, triglycerin polyglycidyl ether, tetraglycerin polyglycidyl ether, and polyglycerin polyglycidyl ether.

6. The organic material (B) is It is a glycidyl ether having a glycerin structure, The epoxy equivalent is an organic material of 100g / eq. or more and 250g / eq. or less.

2. The composite material of claim 1.

7. The organic material (B) is an epoxidized oil, and The organic material contains 6.0% or more and 10% or less of oxirane oxygen.

2. The composite material of claim 1.

8. 2. The composite material according to claim 1, wherein the (A) bioplastic is polylactic acid.

9. In composite materials, The content ratio of the (A) bioplastic and the (B) organic material is The mass ratio is (A) bioplastic: (B) organic material = 99:1 to 70:

30.

2. The composite material of claim 1.

10. The (A) bioplastic is The melt flow rate (MFR) at 190°C is 3g / 10min. to 30g / 10min.

2. The composite material of claim 1.

11. The (A) bioplastic is The melting point is 125℃ to 180℃.

2. The composite material of claim 1.

12. The elastic modulus of the composite material is The elastic modulus of the (A) bioplastic is 0.8 to 1.1 times that of the bioplastic alone.

2. The composite material of claim 1.

13. Composite Materials The tensile modulus is 800 MPa or more, The tensile elongation is 100% or more.

2. The composite material of claim 1.

14. Furthermore, (C) cellulose 2. The composite material of claim 1, comprising:

15. In composite materials, The content ratio of the (C) cellulose is 10% by mass to 60% by mass.

15. The composite material of claim 14.

16. In composite materials, The content ratio of the (B) organic material is 3% by mass to 15% by mass relative to the content of the (C) cellulose.

15. The composite material of claim 14.

17. The (A) bioplastic is It is polylactic acid with an optical purity (L-isomer ratio) of 98% or more.

15. The composite material of claim 14.

18. The (A) bioplastic is It is polylactic acid and has a melting point of 169°C to 180°C.

15. The composite material of claim 14.

19. Furthermore, (D) fatty acid amides 2. The composite material of claim 1, comprising:

20. 1. A method for producing a composite material, comprising: (A) bioplastics; (B) an organic material having three or more glycidyl ethers in its molecule; kneading the above mixture; (1) The maximum cylinder temperature during kneading is 160°C to 220°C. Composite material manufacturing methods.

21. 1. A method for producing a composite material, comprising: (A) bioplastics; (B) an organic material having three or more glycidyl ethers in its molecule; kneading the above mixture; (2) The minimum cylinder temperature during kneading is 150°C to 200°C. Composite material manufacturing methods.

22. In the kneading step, (3) The peripheral speed V of the screw during kneading is 0.3 m / s or more when expressed by the following formula:

22. A method for producing the composite material according to claim 20 or 21. Screw peripheral speed V (m / s) = D x N x π / 60,000 Screw rotor diameter: D (mm) Screw rotation speed: N (min -1 )