Molding resin material and its manufacturing method

Abstract

The present invention addresses the problem of providing a resin material which is prepared by mixing a wood-based biomass with a thermoplastic resin homogeneously and can be molded easily.　According to the present invention, a resin material for molding use is provided, which contains 40 to 90% by mass of a pulverized product of a roasted wood-based biomass product having an average particle diameter of 100 μm or less and also contains a thermoplastic resin.

Description

[Technical field]

[0001] The present invention relates to a molding resin material and a manufacturing method thereof, and in particular to a thermoplastic molding material made from roasted wood biomass and a thermoplastic resin such as polypropylene or polylactic acid as raw materials, and a manufacturing method thereof. [Background technology]

[0002] Biomass materials are attracting attention as industrial resources. Biomass materials are materials derived from plants and other living organisms. Because biomass materials are organic, they emit carbon dioxide when burned. However, the carbon contained in them comes from carbon dioxide absorbed from the atmosphere by the biomass through photosynthesis during its growth, so it is safe to say that the use of biomass materials does not increase the amount of carbon dioxide in the atmosphere overall. This property is called carbon neutral.

[0003] Against the backdrop of global warming and other global environmental issues, there is an urgent need to conserve resources, recycle waste materials to turn them into raw materials, and promote environmental circulation, as typified by biodegradable plastics. In Japan, the revised Recycling Law and the Green Purchasing Law have been established, and the need for products that comply with these laws is also on the rise.

[0004] In this situation, blending biomass materials into resin molded products, which are widely used from materials for automobile parts to everyday items, will promote the practice of the carbon neutral concept. For example, Patent Document 1 describes a composite material containing carboxylmethylated cellulose nanofibers, a polymer compound having a primary amino group, an acid-modified polyolefin, and a polyolefin. Patent Document 2 describes a cellulose composite material containing wood pulp and a polymer matrix. Patent Document 3 describes a method of mixing wood flour and random polypropylene resin and manufacturing a wood flour-containing resin injection molded product using an injection molding machine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication WO2014 / 087767 [Patent Document 2] Special Publication No. 2019-512591 [Patent Document 3] JP 2010-138337 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when simply mixing "wood-based biomass" and "polypropylene," heating and melting them, and molding them, problems arose, such as the fact that the wood-based biomass is hydrophilic and therefore cannot be mixed uniformly with the polypropylene, the resin body being cut into small pieces at the outlet of the device that injects the mixture of wood-based biomass and polypropylene, and the surface of the resulting molded article not being smooth.

[0007] For example, Patent Document 1 describes the use of carboxymethylated cellulose nanofibers, but in order to carboxymethylate the cellulose and further increase the uniform dispersion with the polyolefin resin, it is necessary to add a polymer compound having a primary amino group and an acid-modified polyolefin, which increases costs.

[0008] Therefore, an object of the present invention is to provide a thermoplastic molding material mixed with wood-based biomass, in which wood-based biomass and thermoplastic resin are uniformly mixed and which is less likely to break during molding, such as injection, at low cost. [Means for solving the problem]

[0009] The present inventors discovered that a molding resin material with excellent moldability can be obtained by roasting wood biomass and then mixing it with a thermoplastic resin such as polypropylene or polyethylene, followed by heating and kneading, and thus completed the present invention.

[0010] The present invention includes, but is not limited to, the following: [1] A molding resin material containing 40 to 90 mass% of pulverized wood-based biomass roasted material having an average particle size of 100 μm or less, and further containing a thermoplastic resin. [2] The material according to [1], wherein the thermoplastic resin comprises a polyolefin-based resin, a polypropylene-based resin or a polylactic acid-based resin. [3] The material according to [1] or [2], further comprising a thermoplastic elastomer. [4] The material described in [3], wherein the thermoplastic elastomer includes any one of a styrene-butadiene block copolymer, an ethylene-octene copolymer, and a propylene-ethylene copolymer. [5] The material described in [3], wherein the thermoplastic resin comprises a polypropylene-based resin. [6] The material according to any one of [1] to [5], wherein the woody biomass torrefied product is obtained by torrefying woody biomass under conditions of an oxygen concentration of 10% or less and a temperature of 240 to 350°C. [7] A method for producing a molding resin material, comprising mixing 40 to 90 mass% of pulverized wood-based biomass roasted material having an average particle size of 100 μm or less with a thermoplastic resin. Effect of the Invention

[0011] According to the present invention, a molding resin material containing roasted wood biomass can be stably produced. In addition, by increasing the blending ratio of roasted wood biomass, a molding resin material with excellent carbon neutrality can be obtained. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The roasted product of the present invention can be obtained, for example, by roasting pulverized woody biomass having a size of 50 mm or less under conditions of an oxygen concentration of 10% or less and a material temperature of 240 to 350°C.

[0013] The present invention uses the torrefied woody biomass. Both broad-leaved and coniferous trees can be used as the raw material of woody biomass. Specific examples of broad-leaved trees include, but are not limited to, eucalyptus, rubber tree, beech, chinaberry, white birch, poplar, acacia, oak, maple, elm, paulownia, magnolia, willow, ash, phillyraeoides, oak, sawtooth oak, horse chestnut, zelkova, beech, dogwood, and ash. Examples of coniferous trees include Japanese cedar, spruce, larch, black pine, Abies sachalinensis, Himekomatsu, yew, jew's sedge, and spruce. Examples include fir, Japanese yew, fir, Japanese sawara, Japanese cedar, asunaro, hiba, tsuga, kome tsuga, hinoki, yew, Japanese yew, spruce, yellow cedar, Lawson cypress, Douglas fir, Sitka spruce, radiata pine, eastern spruce, eastern white pine, western larch, western fir, western hemlock, and tamarack.

[0014] Among these, Eucalyptus wood and Hevea brasiliensis are preferred. Examples of Eucalyptus include Eucalyptus (hereinafter abbreviated as E.) calophylla, E. citriodora, E. diversicolor, E. globulus, E. grandis, E. urograndis, E. gummifera, E. marginata, E. nesophila, E. nitens, E. amygdalina, E. camaldulensis, E. delegatensis, E. gigantea, E. muelleriana, E. obliqua, E. regnans, E. sieberiana, E. viminalis, E. marginata, and the like.

[0015] In the present invention, the form of the woody biomass as the raw material is not limited, and for example, wood chips, bark, sawdust, sawdust, etc. can be suitably used. In a preferred embodiment, woody biomass having a size of 50 mm or less can be used as the raw material. For example, the woody biomass can be adjusted to a size of 50 mm or less by crushing, and it is preferable to use woody biomass crushed to a size of 1 mm or more and 50 mm or less as the raw material. In the present invention, the size of the woody biomass crushed product is sieved according to the size of the circular holes of a sieving device. When crushing the woody biomass, it is preferable to crush it with, for example, a hammer mill or a knife-cutting type biomass fuel chipper.

[0016] In the present invention, torrefaction of wood-based biomass is used. Torrefaction generally refers to a process of heating in a low-oxygen atmosphere at a temperature lower than that of so-called carbonization. The temperature of normal wood carbonization is 400 to 700°C, but in the present invention, torrefaction is performed at 240 to 350°C. By torrefaction, a solid fuel having a higher energy density than the starting material is obtained.

[0017] The roasting treatment conditions in the present invention are an oxygen concentration of 10% or less and a material temperature of 240 to 350°C. Here, the material temperature in roasting is the temperature of woody biomass near the outlet of the roasting treatment device. In the present invention, roasting is performed under conditions of an oxygen concentration of 10% or less, but if the oxygen concentration exceeds 10%, the material yield and heat yield may decrease. In addition, if the material temperature is less than 240°C, it is difficult to crush the roasted material to a small particle size, and if it exceeds 350°C, the material yield and heat yield decrease. The material temperature is preferably 240 to 330°C, and more preferably 250 to 320°C. Hemicellulose is significantly decomposed at around 270°C, while cellulose is significantly decomposed at around 355°C and lignin is significantly decomposed at around 365°C. Therefore, it is presumed that by setting the roasting treatment temperature to 170 to 350°C, hemicellulose is preferentially decomposed by heat, and a molding resin material that can achieve both material yield and crushability can be produced.

[0018] In the present invention, the apparatus for carrying out the roasting treatment is not particularly limited, but a rotary kiln and / or a vertical furnace is preferred. It is preferable to replace the inside of the apparatus with an inert gas such as nitrogen in order to adjust the oxygen concentration to 10% or less. The treatment time of the roasting treatment is not particularly limited, but is preferably, for example, 1 to 180 minutes, more preferably 5 to 120 minutes, and even more preferably 10 to 60 minutes. When a continuous type apparatus is used, the residence time in the roasting apparatus may be controlled.

[0019] In the present invention, an externally heated roasting device may be used as a device for performing the roasting treatment. For example, an externally heated rotary kiln has a structure in which a part or all of the kiln inner cylinder is covered with a kiln outer cylinder, and woody biomass is roasted in the inner cylinder, and fuel is burned in the outer cylinder to indirectly heat the woody biomass inside the inner cylinder. The temperature inside the kiln outer cylinder can be 400 to 800 ° C, and is preferably 450 to 750 ° C. If the temperature inside the kiln outer cylinder is less than 400 ° C, the pyrolysis of the woody biomass in the kiln inner cylinder becomes insufficient, and the crushability of the obtained solid fuel decreases. On the other hand, if the temperature exceeds 800 ° C, the temperature of the woody biomass in the kiln inner cylinder rises excessively, and the material yield and heat yield of the obtained solid fuel decrease.

[0020] The roasted product used in the present invention preferably has a material yield of 60 to 90% and a calorific yield of 70 to 95% relative to the raw wood biomass. The Hardgrove Crushability Index (HGI) as defined in JIS M 8801:2004, which is an index of crushability, is preferably 25 or more, more preferably 30 or more. The higher the HGI, the easier it is to crush. If the HGI is in the range of 25 to 70, it becomes easy to mix with a thermoplastic resin and mold it.

[0021] The roasted product used in the present invention may be in the form of a molded product. That is, the starting material (roasted product) in the form of a pulverized wood biomass is molded into a briquette or pellet shape. By molding the product, it becomes easier to handle and the transportation cost can be reduced because of the high density. The bulk density of the molded product after the high density treatment is 500 kg / m 3 More preferably, it is 600 kg / m or more. 3 The bulk density can be measured in accordance with JIS K 2151, Section 6, "Test method for bulk density."

[0022] In the present invention, the device for forming the roasted product into a molded product is not particularly limited, but for example, a briquette (manufactured by Kitagawa Iron Works), a ring die type pelletizer (manufactured by CPM), a flat die type pelletizer (manufactured by Kahl or Dalton), etc. are preferable.

[0023] In the present invention, when the roasted material is molded into a molded product, the moisture content of the roasted material is preferably 8 to 50%, more preferably 10 to 30%. If the moisture content is less than 8%, clogging occurs inside the briquette or pelletizer, making it impossible to produce a stable molded product. If the moisture content exceeds 50%, molding is difficult, and the roasted material is discharged in a powder or paste form.

[0024] In the present invention, a binder may be added to the roasted product. The binder is not particularly limited, but for example, organic polymers such as starch and lignin, inorganic polymers such as acrylic acid amide, and agricultural residues such as bran (residue generated during wheat flour production) can be suitably used. From the viewpoint of efficiently and effectively utilizing woody biomass, it is desirable to add a small number of binders, preferably 50 parts by mass or less, more preferably 20 parts by mass or less, per 100 parts by mass of the roasted product. However, adding 50 parts by mass or more does not mean that densification is impossible.

[0025] In the present invention, it is preferable to pulverize the roasted material before kneading it with the thermoplastic resin. It is necessary that the average particle size of the pulverized material is 100 μm or less, and more preferably 50 μm or less. If the average particle size of the pulverized material of the roasted material is larger than 100 μm, it becomes difficult to uniformly mix it with the resin, and problems such as the resin body being cut into small pieces at the outlet of the device that injects the mixture of the pulverized material and the resin, and the difficulty in conveying it to the cooling treatment device may occur. The average particle size is the volume 50% average particle size (D50) measured by the laser light scattering method (laser diffraction method), and can be measured by a laser diffraction / scattering type particle size distribution analyzer (manufactured by Malvern, device name: Mastersizer 2000) or the like.

[0026] The grinding machine used to grind the roasted material may be any machine capable of grinding organic materials, and examples of the machine that can be used include, but are not limited to, a ball mill, a rod mill, a bead mill, a conical mill, a disk mill, an edge mill, a hammer mill, a mortar, a pellet mill, a VSI mill, a Willy mill, a roller mill, a jet mill, and a mass colloider.

[0027] The molding resin material of the present invention can be obtained by heating and kneading the roasted product with a thermoplastic resin. The compounding ratio of the roasted product in the molding resin material is preferably high in order to achieve a high level of carbon neutrality, but is preferably 10% by mass or more and 90% by mass or less, more preferably 30% by mass or more and 80% by mass or less, in consideration of the production and strength of the resulting resin material and molded article.

[0028] The thermoplastic resin used in the present invention is preferably molded into granules for ease of handling, but may be in any form. Two or more types of thermoplastic resins may be used simultaneously. Biodegradable resins having thermoplastic properties are also included. Furthermore, when kneading with the roasted product, a compatibilizing resin (compatibilizing agent) that is also a thermoplastic resin may be added for the purpose of improving uniformity and adhesion.

[0029] Examples of thermoplastic resins include, but are not limited to, polyethylene and polypropylene, and any resin that can be plasticized and molded by heat can be used. Among them, polyethylene such as LDPE (low density polyethylene) and polypropylene are preferred from the viewpoint of moldability.

[0030] In the present invention, a biodegradable resin may be used as the thermoplastic resin. Examples of the biodegradable resin having thermoplasticity include, but are not limited to, polylactic acid (PLA), polybutylene succinate, polyethylene succinate, polyglycol, polycaprolactone, polyvinyl alcohol, and the like.

[0031] As the compatibilizing resin, a known one can be used, and examples thereof include, but are not limited to, maleic acid modified polypropylene (UMEX 1010, manufactured by Sanyo Chemical Industry Co., Ltd.) and Modic (registered trademark) P908 (manufactured by Mitsubishi Chemical Industry Co., Ltd.). The compatibilizing resin acts to improve the uniform mixing and adhesion between the roasted product and the thermoplastic resin. The compatibilizing resin does not have to be used, but when used, it is used in an amount of up to about 15 mass% in the molding resin material obtained by kneading.

[0032] In the present invention, by adding a thermoplastic elastomer, it is possible to stably produce a molding resin material with high viscosity that does not cut, crack, or the like during injection molding, even when ground wood biomass roasted material is blended.

[0033] The thermoplastic elastomer used in the present invention may be a styrene-based thermoplastic elastomer. More specifically, it may be a block copolymer such as a styrene-butadiene-styrene (SBS) copolymer, a styrene-isoprene-styrene (SIS) copolymer, a styrene-ethylene-butylene-styrene (SEBS) copolymer, a styrene-ethylene-propylene-styrene (SEPS) copolymer, or a styrene-butadiene-butylene-styrene (SBBS) copolymer. These may be used alone or in combination of two or more.

[0034] The thermoplastic elastomer used in the present invention may be a polyolefin-based elastomer. More specifically, it may be an ethylene-butene copolymer, EPR (ethylene-propylene copolymer), modified ethylene-butene copolymer, EEA (ethylene-ethyl acrylate copolymer), modified EEA, modified EPR, modified EPDM (ethylene-propylene-diene terpolymer), ionomer, α-olefin copolymer, modified IR (isoprene rubber), modified SEBS (styrene-ethylene-butylene-styrene copolymer), halogenated isobutylene-paramethylstyrene copolymer, ethylene-acrylic acid modified product, ethylene-vinyl acetate copolymer, and acid modified product thereof, and mixtures containing them as main components. These may be used alone or in combination of two or more.

[0035] Preferred thermoplastic elastomers for use in the present invention include styrene-butadiene block copolymers, ethylene-octene copolymers, propylene-ethylene copolymers, etc. They may also be modified with maleic anhydride, fumaric anhydride, etc. In the styrene-butadiene block copolymers, the styrene content is preferably 15 to 30% by mass.

[0036] The blending ratio of the thermoplastic elastomer is preferably 1 to 20 mass%, and more preferably 3 to 10 mass%. That is, the blending ratio of the pulverized wood biomass roasted material, the thermoplastic resin, and the thermoplastic elastomer is preferably 40-90:59-10:1-20.

[0037] A molded article can be obtained by heat-treating the molding resin material of the present invention. The temperature at which the molding resin material of the present invention is heat-treated (heated, melted, kneaded, etc.) is usually about 100 to 300° C., preferably about 110 to 250° C., and particularly preferably about 120 to 220° C. The molded article obtained by heat treatment can be molded into a desired shape by a conventionally known resin molding method.

[0038] In the method for producing a molding resin material of the present invention, the roasted product and the thermoplastic resin can be heated and kneaded using an apparatus generally used for resin molding. For example, a general extruder can be used.

[0039] The molding resin material of the present invention can be used to produce various molded articles. For molding, a method commonly used for molding thermoplastic resins can be used, such as, but not limited to, injection molding, extrusion molding, blow molding, mold molding, hollow molding, and foam molding.

[0040] The molding resin material of the present invention or the molded article obtained by molding it may contain organic and / or inorganic substances other than the thermoplastic resin and the roasted product. Examples of other components include alkalis such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, etc.; inorganic fillers such as clay, talc, calcium carbonate, myca, titanium dioxide, zinc oxide, etc.; organic fillers such as carbon black, graphite, glass flakes, etc.; dyes or pigments such as red iron oxide, azo pigments, phthalocyanines, etc.; and additives for modification such as dispersants, lubricants, plasticizers, release agents, flame retardants, antioxidants (phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants), antistatic agents, light stabilizers, ultraviolet absorbers, metal deactivators, crystallization promoters (nucleating agents), foaming agents, crosslinking agents, and antibacterial agents.

[0041] The molding resin material of the present invention can be molded for various purposes and can be used as a substitute for plastic products. Molded articles obtained from the molding resin material of the present invention can be widely applied to, for example, trays, automobile parts, interiors such as automobile dashboards, luggage compartments for airplanes, structural members for transport equipment, housings for home appliances, electrical appliance members, cards, various containers such as toner containers, building materials, seedling pots, agricultural sheets, writing implements, wooden products, household appliances, straws, cups, toys, sports goods, harbor members, building members, generators, tools, fishing gear, packaging materials, 3D printer models, pallets, food containers, tableware, cutlery (spoons, forks, etc.), chopsticks, various sheets, etc. When these products are no longer needed, they will be disposed of, but even if they are incinerated and carbon dioxide is emitted, the roasted wood biomass that is mixed in can be treated as not increasing the amount of carbon dioxide in the atmosphere. EXAMPLES

[0042] The present invention will be described in more detail below with reference to experimental examples of the present invention, but the present invention is not limited to these experimental examples. Unless otherwise specified, parts and % refer to parts by mass and % by mass, and numerical ranges are described as including their endpoints.

[0043] Experiment 1 (1) Manufacturing of molding resin (Sample 1-1) Eucalyptus eurograndis wood chips were crushed using a disc chipper. After crushing, the crushed chips with sizes of 1 to 50 mm were dried for 3 hours at 70°C using a conveyor dryer (manufactured by Alvan Blanch) to adjust the moisture content to 10%.

[0044] Next, using a large rotary kiln-type carbonization furnace, roasting was performed with an oxygen concentration of 1% or less, and a material temperature of the chip crushed material in the carbonization furnace of 260°C, with a residence time of 12 minutes, to obtain a roasted product of woody biomass. After cooling the obtained roasted product, it was pulverized to an average particle size of 50 μm using a Lab Mill (manufactured by Osaka Chemical Co., Ltd.).

[0045] Next, the crushed roasted material and polypropylene (product name: J106G, manufactured by Prime Polymer, melt flow rate: 15 g / 10 min) were mixed in a compounding ratio of 50:50, and the mixture was heated and kneaded at 175°C, 45 rpm, and 5 minutes in a Labo Plastomill (R100, manufactured by Toyo Seiki) to produce a molding resin material (weight ratio of crushed roasted material:polypropylene = 50:50).

[0046] The average particle size of the pulverized roasted product was measured using a laser diffraction particle size measuring device (Mastersizer 3000, manufactured by Malvern), and the 50% particle size based on volume was taken as the average particle size.

[0047] (Sample 1-2) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polypropylene were mixed in a compounding ratio of 60:40 (weight ratio of ground roasted material:polypropylene=60:40).

[0048] (Sample 1-3) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polypropylene were mixed in a compounding ratio of 70:30 (weight ratio of ground roasted material:polypropylene=70:30).

[0049] (Sample 1-4) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polypropylene were mixed in a compounding ratio of 80:20 (weight ratio of ground roasted material:polypropylene=80:20).

[0050] (Sample 1-5) A molding resin material was produced in the same manner as Sample 1-1, except that the ground roasted material and polyethylene (product name: Novatec HD HJ490, manufactured by Japan Polyethylene, melt flow rate: 20 g / 10 min) were mixed in a compounding ratio of 50:50 (weight ratio of ground roasted material:polyethylene=50:50).

[0051] (Sample 1-6) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polyethylene were mixed in a compounding ratio of 60:40 (weight ratio of ground roasted material:polyethylene=60:40).

[0052] (Sample 1-7) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polyethylene were mixed in a compounding ratio of 70:30 (weight ratio of ground roasted material:polyethylene=70:30).

[0053] (Sample 1-8) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polyethylene were mixed in a compounding ratio of 80:20 (weight ratio of ground roasted material:polyethylene=80:20).

[0054] (Sample 1-9) A molding resin material was produced in the same manner as Sample 1-1, except that the ground roasted material and polylactic acid (product name: Ingeo Biopolymer 3001D, NatureWorks, melt flow rate: 22 g / 10 min) were mixed in a mixing ratio of 50:50 (weight ratio of ground roasted material:polylactic acid=50:50).

[0055] (Sample 1-10) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polylactic acid were mixed in a compounding ratio of 60:40 (weight ratio of ground roasted material:polylactic acid=60:40).

[0056] (Sample 1-11) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polylactic acid were mixed in a compounding ratio of 70:30 (weight ratio of ground roasted material:polylactic acid=70:30).

[0057] (Sample 1-12) A molding resin material was produced in the same manner as in Sample 1-1, except that the ground roasted material and polylactic acid were mixed in a compounding ratio of 80:20 (weight ratio of ground roasted material:polylactic acid=80:20).

[0058] (Samples 1-13, Comparative Examples) A molding resin material was produced in the same manner as Sample 1-1, except that cellulose powder (product name: KC Flock W-50, manufactured by Nippon Paper Industries Co., Ltd.)) and polypropylene (J106G, manufactured by Prime Polymer, melt flow rate: 15 g / 10 min) were mixed in a ratio of 30:70 (weight ratio of cellulose powder:polypropylene = 30:70).

[0059] (Samples 1-14, Comparative Examples) A molding resin material was produced in the same manner as in Sample 1-1, except that the cellulose powder and polypropylene were mixed in a compounding ratio of 50:50 (weight ratio of cellulose powder:polypropylene=50:50).

[0060] (Samples 1-15, Comparative Examples) A molding resin material was produced in the same manner as Sample 1-1, except that fluff pulp (product name: Eucafluff, manufactured by Suzano) and polypropylene were mixed in a compounding ratio of 10:90 (weight ratio of fluff pulp:polypropylene=30:70).

[0061] (Samples 1-16, Comparative Examples) A molding resin material was produced in the same manner as in Sample 1-1, except that fluff pulp and polypropylene were mixed in a compounding ratio of 20:80 (weight ratio of fluff pulp:polypropylene=20:80).

[0062] (2) Evaluation of molding resin The kneadability of the above molding resin was evaluated using a Labo Plastomill (R100, manufactured by Toyo Seiki Seisakusho). ◎: The fluidity of the kneaded material is very good (uniformly kneaded and has good fluidity) ○: The kneaded product has good fluidity (it is kneaded uniformly, but the molded product is easily broken) △: Poor fluidity of the kneaded material (uneven kneading) ×: Cannot be kneaded

[0063] [Table 1]

[0064] As shown in Table 1, the molding resin material of the present invention had better kneadability than molding resin materials containing cellulose powder or fluff pulp. According to the present invention, it is possible to produce a molding resin material that has excellent flowability and can be injection molded.

[0065] Experiment 2 (1) Manufacturing of molding resin (Sample 2-1) Eucalyptus eurograndis wood chips were crushed using a disc chipper. After crushing, the crushed chips with sizes of 1 to 50 mm were dried for 3 hours at 70°C using a conveyor dryer (manufactured by Alvan Blanch) to adjust the moisture content to 10%.

[0066] Next, using a large rotary kiln-type carbonization furnace, roasting was performed with an oxygen concentration of 1% or less, and a material temperature of the chip crushed material in the carbonization furnace of 260°C, with a residence time of 12 minutes, to obtain a roasted product of woody biomass. After cooling the obtained roasted product, it was pulverized to an average particle size of 50 μm using a Lab Mill (manufactured by Osaka Chemical Co., Ltd.).

[0067] Next, the crushed roasted material, polypropylene (product name: J107G, Prime Polymer, melt flow rate: 30 g / 10 min), and a styrene-butadiene block copolymer as a thermoplastic elastomer (product name: H1052, styrene content 23%, Asahi Kasei Corporation) were mixed in a mixing ratio of 50:40:10 and heated and kneaded in a Labo Plastomill (R100, Toyo Seiki) at 175°C, 45 rpm, and 5 minutes to produce a resin material for molding.

[0068] The average particle size of the pulverized roasted product was measured using a laser diffraction particle size measuring device (Mastersizer 3000, manufactured by Malvern), and the 50% particle size based on volume was taken as the average particle size.

[0069] (Sample 2-2) A molding resin material was produced in the same manner as Sample 2-1, except that a styrene-butadiene block copolymer (product name: H1062, styrene content 21%, manufactured by Asahi Kasei Corporation) was used as the thermoplastic elastomer.

[0070] (Sample 2-3) A molding resin material was produced in the same manner as Sample 2-1, except that a styrene-butadiene block copolymer (product name: H1221, styrene content 18%, manufactured by Asahi Kasei Corporation) was used as the thermoplastic elastomer.

[0071] (Sample 2-4) A molding resin material was produced in the same manner as Sample 2-1, except that a propylene-ethylene copolymer (product name: V4301, manufactured by Dow Chemical) was used as the thermoplastic elastomer.

[0072] (Sample 2-5) A molding resin material was produced in the same manner as Sample 2-1, except that the ground roasted product, polypropylene (product name: J107G, manufactured by Prime Polymer, melt flow rate: 30 g / 10 min), a styrene-butadiene block copolymer (product name: H1052, styrene content 23%, manufactured by Asahi Kasei Corporation) as a thermoplastic elastomer, and a compatibilizer (product name: UMEX 1010, manufactured by Sanyo Chemical Industries) were mixed in a ratio of 50:39.5:10:0.5.

[0073] (Sample 2-6) A molding resin material was produced in the same manner as in Sample 2-1, except that the thermoplastic elastomer was not added and the ground roasted material and polypropylene were mixed in a compounding ratio of 50:50.

[0074] (2) Evaluation of molding resin The tensile strength of the produced molding resin material was measured. Specifically, a JIS 6251 dumbbell was made using a DSM Xplore Compounder 15 (manufactured by Leo Labs), and the measurement was performed at a tensile speed of 1 mm / min in accordance with JIS K 7161: Plastics - Test method for tensile properties.

[0075] [Table 2]

[0076] As shown in the above table, the molding resin material to which the thermoplastic elastomer is added has a higher breaking strain and higher tenacity than the molding resin material to which the thermoplastic elastomer is not added, and therefore has excellent moldability.

Claims

1. A molding resin material containing ground wood-based biomass roasted material having an average particle size of 100 μm or less, a thermoplastic resin, and a thermoplastic elastomer, The material has a content of 40 to 90 mass% of pulverized wood biomass roasted material and a content of 1 to 20 mass% of thermoplastic elastomer.

2. The material of claim 1 , wherein the thermoplastic resin comprises a polyolefin-based resin or a polylactic acid-based resin.

3. The material according to claim 1 or 2, wherein the thermoplastic elastomer comprises any one of a styrene-butadiene block copolymer, an ethylene-octene copolymer, and a propylene-ethylene copolymer.

4. The material according to any one of claims 1 to 3, wherein the thermoplastic resin comprises a polypropylene-based resin.

5. The material according to any one of claims 1 to 4, wherein the woody biomass roasted product is obtained by roasting woody biomass under conditions of an oxygen concentration of 10% or less and a temperature of 240 to 350°C.

6. A method for producing the molding resin material according to any one of claims 1 to 5, comprising the steps of: The above method includes mixing a pulverized product of wood-based biomass roasted product having an average particle size of 100 μm or less with a thermoplastic resin.

Images