JP2014025053A - Vegetable-based resin pellet, method for manufacturing the same and molded article of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vegetable-based resin pellet that is excellent in processability and can give good external appearance approaching that of natural wood or the like, to provide a method for manufacturing the vegetable-based resin pellet and to provide a molded article of the vegetable-based resin pellet.SOLUTION: The vegetable-based resin pellet includes (1) vegetable powder, (2) a wax-based resin material having a melting point of 40-155°C, at least one kind selected from the group consisting of a lubricant and a dispersant and (3) a base resin having a melting point of 125-350°C. The vegetable powder has a coating layer including the wax-based resin material having a melting point of 40-155°C and at least one kind selected from the group consisting of a lubricant and a dispersant on the surface thereof and the vegetable powder having the coating layer is dispersed in the base resin having a melting point of 125-350°C.

Description

  The present invention relates to a plant-based resin pellet, a production method thereof, and a molded body thereof.

  In contributing to the reduction of carbon dioxide for protecting the global environment, it is effective to increase the plant powder rate in synthetic resin molded products.

  There has been proposed a method of manufacturing a building material or the like by molding a resin composition in which a vegetable powder is blended with a thermoplastic resin such as a polyolefin resin. According to such a method, it is possible to obtain a molded article having a high mechanical strength and having an appearance and feel close to that of wood, and a piece of wood produced as a by-product during lumbering, waste of coffee beans after extraction of coffee, If seeds, bran, etc. are pulverized as needed and used as plant powder, it will be possible to effectively use earth resources.

  Such a resin composition can obtain a wood texture closer to natural wood by increasing the blending amount of plant powder.

  Patent Document 1 discloses a plant-based resin pellet in which plant powder and a wax material are used in combination. However, when molded using this pellet, it is difficult to uniformly disperse the plant powder, so that physical properties such as strength and appearance are inferior. Since it is easy to become a product and it is difficult to uniformly disperse the colorant, it is difficult to color the desired color.

JP 2011-236410 A

  The present invention can be molded in the same manner as a resin using a molding machine such as an injection molding machine, an extrusion molding machine, a blow molding machine, an inflation molding machine, a sheet molding machine, a direct pressure molding machine, and a pneumatic molding machine. An object of the present invention is to provide a plant-based resin pellet having characteristics such as physical properties and easy coloring, a method for producing the pellet, and a molded product thereof.

The present invention provides the following plant-based resin pellets, production methods thereof, and molded articles thereof.
Item 1. (1) plant powder, (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and (3) a plant resin containing a base resin having a melting point of 125 to 350 ° C. A plant powder having a coating layer containing at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, on the surface of the plant powder, wherein the plant powder has the coating layer. Plant-based resin pellets dispersed in a base resin having a melting point of 125 to 350 ° C.
Item 2. (1) 70 to 95 parts by weight of plant powder, (2) 0.01 to 30 parts by weight of at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant; The plant-type resin pellet of claim | item 1 containing the base resin of melting | fusing point 125-350 degreeC by the ratio of plant powder: base resin = 70: 30-5: 95 by weight ratio.
Item 3. Item 3. The plant-based resin pellet according to Item 1 or 2, further comprising titanium oxide and having a natural color tone that is easily colored.
Item 4. The molded object formed by shape | molding the plant-type resin pellet in any one of claim | item 1-3 individually or in combination with another base resin.
Item 5. Item 4. A molded product obtained by blending and molding the other plant resin and the colorant into the plant-based resin pellet according to any one of Items 1 to 3.
Item 6. (1) plant powder and (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and mixing the plant powder with the melting point of 40 to 155 ° C. Coating with at least one selected from the group consisting of a resin-based resin material, a lubricant and a dispersing agent, and then (3) kneading with a base resin having a melting point of 125 to 350 ° C. to produce plant-based resin pellets The manufacturing method of the plant-type resin pellet in any one of claim | item 1 -3.

Furthermore, the present invention provides the following items 1A to 11A.
Item 1A. (1) plant powder, (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and (3) a plant resin containing a base resin having a melting point of 125 to 350 ° C. pellet.
Item 2A. (1) 70 to 95 parts by weight of plant powder, (2) 0.01 to 30 parts by weight of at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant; ) Plant-based resin pellets containing a base resin having a melting point of 125 to 350 ° C. in a weight ratio of plant powder: base resin = 70: 30 to 5:95.
Item 3A. Item 1. The plant resin pellet according to Item 1A or 2A, wherein the base resin is an amorphous plastic, a crystalline plastic, or a thermosetting resin.
Item 4A. Item 3. The plant-based resin pellet according to Item 3A, wherein the base resin is a polyolefin-based resin.
Item 5A. The base resin is polyvinyl chloride, polystyrene, acrylonitrile-styrene (AS) resin, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate, polyethylene, polypropylene, polybutylene, fluororesin, polyamide, polyacetal, ethylene-vinyl acetate copolymer Item 3. The plant-based resin pellet according to Item 3A, which is (EVA), a melamine resin, a polyester, a silicone resin, an epoxy resin, a phenol resin, a copolymer thereof, or an elastomer.
Item 6A. A composite material is prepared by mixing (1) plant powder and (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and coating the plant powder with the wax material. The plant-based resin pellet according to any one of Items 1A to 5A, which is obtained by kneading the composite material and (3) a base resin having a melting point of 125 to 350 ° C.
Item 7A. Item 6. The plant-based resin pellet according to any one of Items 1A to 6A, wherein the particle size of the plant powder is 30 to 2000 μm.
Item 8A. (1) has at least one coating layer selected from the group consisting of (2) a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant on the surface of the plant powder, and (3) a base resin on the outside thereof The plant-type resin pellet in any one of claim | item 1A-7A which has a skin layer containing.
Item 9A. The molded object formed by shape | molding the plant-type resin pellet in any one of claim | item 1A-8A independently or in combination with other base resin.
Item 10A. Obtained by extrusion molding or injection molding. Item 10. A molded article according to item 9A.
Item 11A. (1) plant powder and (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and mixing the plant powder with the melting point of 40 to 155 ° C. Coating with at least one selected from the group consisting of a resin-based resin material, a lubricant and a dispersing agent, and then (3) kneading with a base resin having a melting point of 125 to 350 ° C. to produce plant-based resin pellets The manufacturing method of the plant-type resin pellet in any one of claim | item 1A-8A.

  According to the present invention, a plant system that can be molded in the same manner as a resin using a molding machine such as an injection molding machine, an extrusion molding machine, a blow molding machine, an inflation molding machine, a sheet molding machine, a direct pressure molding machine, or a pressure molding machine. Resin pellets are obtained.

The plant-based resin pellet of the present invention can obtain a colored molded product by blending a further base resin and a colorant, kneading and molding.
By adding a white pigment such as titanium oxide together with the base resin that constitutes the plant resin pellet, or by producing a plant resin pellet using the base resin in which the white pigment is dispersed, the plant system has a natural texture. Resin pellets and molded articles using the same can be obtained.

  Plant-based resin pellets obtained by the present invention can easily adjust the physical properties such as tensile strength, bending strength, thermal deformation rate, thermal shrinkage rate, Charpy impact strength of molded products to desired physical property values, Good-quality molded products can be obtained.

  In the plant-based resin pellet according to the present invention, plant powder is treated with at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and then a base having a melting point of 125 to 350 ° C. It can be obtained by treating with a resin. The obtained plant-based resin pellet is obtained by coating the center plant powder with a coating layer containing at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and surrounding the base resin. And a layer having a structure covered with a skin layer or a matrix. By coating the plant powder with a coating layer before mixing it with the base resin, the plant powder is burnt (carbonized), colored, smelled, gas even when treated with a base resin with a melting point of 125-350 ° C. Generation | occurrence | production etc. are suppressed and it is excellent in coloring property, and deterioration of quality can be prevented.

  When the colorant is contained in the coating layer containing at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, good colorability cannot be obtained. On the other hand, blending and kneading another base resin and a colorant to the plant-based resin pellet of the present invention is preferable because a molded product (mixed product) having good colorability can be obtained.

  The melting point of the wax-based resin material is 40 to 155 ° C, preferably 40 to 130 ° C.

  As the lubricant, an inorganic lubricant or an organic lubricant is used. Examples of inorganic lubricants include talc, silica, zeolite, mica, and organic lubricants include fatty acid amides and silicon compounds. The fatty acid amides include caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, arachidic acid amide, behenic acid amide, palmitoleic acid amide, oleic acid amide, eicosene Acid amide, erucic acid amide, elaidic acid amide, trans-11-eicosenoic acid amide, trans-13-docosenic acid amide, linoleic acid amide, linolenic acid amide, ricinoleic acid amide, ethylenebisstearic acid amide, erucic acid amide, etc. is there. As a lubricant, RIKEN Vitamin Riquemaster, Riquemar, etc. can be used.

  Dispersants include ethylene bisamide, calcium stearate, zinc stearate, magnesium stearate, aluminum stearate, barium stearate, lithium stearate, lead stearate, sodium oleate, barium laurate, zinc laurate, stearic acid Etc.

  The base resin having a melting point of 125 to 350 ° C. is preferably a base resin having a melting point of 125 to 230 ° C. This is because the plant powder is heated to a temperature higher than the melting point of the base resin. If the melting point of the base resin is 125 to 230 ° C., the skin layer or matrix containing the base resin is formed without coloring the plant powder. Because it can. If the melting point of the base resin is more than 230 ° C., particularly more than 300 ° C., the plant powder is carbonized and becomes brown or black. However, if the molded product (product) is such a dark color, the plant powder is carbonized. Even if the melting point is higher than 230 ° C., particularly higher than 300 ° C., it can be used without any problem as a base resin.

  In the plant-based resin pellet of the present invention, first, 70 to 95 parts by weight of plant powder is 0.01 to 30 parts by weight of at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant. Followed by treatment with a base resin having a melting point of 125-350 ° C. The amount of the base resin used is determined so that the weight ratio of plant powder: base resin = 70: 30 to 5:95. The plant-based resin pellet of the present invention is at least one selected from the group consisting of plant powder, a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and the base resin having a melting point of 125 to 350 ° C. is a plant powder 70 0.01 to 30 parts by weight, preferably 0.1 to 10 parts by weight, more preferably selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, to 95 parts by weight Contains 0.3 to 5 parts by weight, more preferably 0.4 to 3 parts by weight, particularly 0.5 to 2.5 parts by weight, and plant powder: base resin = 70: 30 to 5: The base resin is included in an amount of 95.

  At least one compounding amount selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersing agent with respect to 70 to 95 parts by weight of the plant powder is 40 to 95 parts by weight of the plant powder. In the case of a wax-based resin material at 155 ° C., preferably 0.1 to 5 parts by weight, more preferably 0.3 to 3 parts by weight, still more preferably 0.4 to 2.5 parts by weight, particularly 0.5 to 2 parts. Parts by weight. In the case of a lubricant with respect to 70 to 95 parts by weight of plant powder, preferably 0.1 to 5 parts by weight, more preferably 0.3 to 3 parts by weight, still more preferably 0.4 to 2.5 parts by weight, and particularly preferably 0. 5 to 2 parts by weight. In the case of a dispersant with respect to 70 to 95 parts by weight of plant powder, preferably 0.1 to 5 parts by weight, more preferably 0.3 to 3 parts by weight, still more preferably 0.4 to 2.5 parts by weight, particularly 0. 0.5 to 2 parts by weight.

  When at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant is used in a small amount of 0.01 parts by weight or close thereto, by using an emulsion type, Plant flour can be coated. In addition, the compounding quantity of at least 1 sort (s) chosen from the group which consists of a wax-type resin material of melting | fusing point 40-155 degreeC, a lubricant, and a dispersing agent and a base resin is computed by solid content.

  In one embodiment, the present invention provides two types of natural pellets: (i) natural plant resin pellets with a woody texture and (ii) plant resin pellets with easy coloration and natural color. . Natural plant-based resin pellets with a woody texture are pellets obtained without adding colorants or titanium oxide to change the woody texture derived from plants, and are generally light brown or brown Or it is a pellet of dark brown color. The difference in color depends on the color of the plant powder and the temperature at which the plant resin pellets are produced. When plant resin pellets are produced at a low temperature (for example, 125 to 150 ° C.), the color becomes pale, and as the temperature rises from 150 to 200 ° C., further 250 ° C. or 300 ° C., the color of the plant powder increases. Tend to be. Plant-based resin pellets that are easy to color and have a natural color tone, the color of the plant powder is lightened by the action of titanium oxide, and the color becomes particularly whitish, so when mixing with other base resins to produce molded products or mixed products By using a colorant, any color can be easily colored. When titanium oxide was used, the temperature rose from 150 to 200 ° C., further to 250 ° C. or 300 ° C., as well as when the temperature when producing plant resin pellets was low (for example, 125 to 150 ° C.). Even in this case, a plant resin pellet having a thin and whitish color can be obtained, which is particularly preferable. The amount of titanium oxide used at this time is about 0.1 to 5% by weight, preferably about 0.3 to 4% by weight, more preferably about 0.5 to 3% by weight, based on the total weight of the plant-based resin pellets. Generally, when the plant powder is dark or the final product (molded product, mixed product) is lightly colored, it is preferable to use a large amount of titanium oxide to make the pellet color as close to white as possible.

  Examples of the colorant include white pigments such as titanium dioxide; black pigments such as carbon black, acetylene black, lamp black, bone black, graphite, iron black, and aniline black; yellow iron oxide, titanium yellow, monoazo yellow, condensed azo yellow, Yellow pigments such as azomethine yellow, bismuth vanadate, benzimidazolone, isoindolinone, isoindoline, quinophthalone, benzidine yellow, permanent yellow; orange pigments such as permanent orange; red iron oxide, naphthol AS azo red, ansanthrone, anthra Red pigments such as quinonyl red, perylene maroon, quinacridone red pigment, diketopyrrolopyrrole, watching red, permanent red; cobalt purple, quinacridone violet, dioxazine violet Purple pigments such as cobalt blue; Blue pigments such as cobalt blue, phthalocyanine blue and selenium blue; Green pigments such as phthalocyanine green; Metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphide and zinc powder; Metal Oxide-coated mica powder, pearlescent pigments such as mica-like iron oxide; barita powder, precipitated barium sulfate, barium carbonate, calcium carbonate, gypsum, clay, silica, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, Body pigments such as gloss white, monoazo dyes, polyazo dyes, metal complex azo dyes, azo dyes such as pyrazolone azo dyes, stilbene azo dyes and thiazolazo dyes; anthraquino dyes such as anthraquinone derivatives and anthrone derivatives; indigo derivatives and thioindigo derivatives Indigo Dye; phthalocyanine dye; carbonium dye such as diphenylmethane dye, triphenylmethane dye, xanthene dye, acridine dye; quinone imine dye such as azine dye, oxazine dye, thiazine dye; methine dye such as polymethine (or cyanine) dye, adimethine dye; Examples thereof include quinoline dyes; nitro dyes; nitrone dyes; benzoquinone and naphthyquinone dyes; naphthalimide dyes; perinone dyes, and the like. Colorants can include pigments and dyes.

  Although the compounding quantity of a coloring agent is not specifically limited, For example with respect to a plant-type resin pellet or a molded object 0.001 to 6 weight%, Preferably it is 0.05 to 4 weight%, More preferably, it is 0.5 to 2 weight% %. The colorant is preferably blended with the base resin.

  The blending amount of the colorant when blended with the plant-based resin pellet is 0.1 to 8 weights based on the weight of the plant-based resin pellet with the base resin having a melting point of 125 to 350 ° C. blended with the plant-based resin pellet. %, Preferably about 0.5 to 6% by weight, more preferably about 1 to 4% by weight, especially about 1 to 3% by weight.

  The blending amount of the colorant blended when producing the molded body from the plant resin pellet is about 0.05 to 6% by weight, preferably about 0.2 to 4% by weight, more preferably based on the molded body. It is about 0.6 to 3% by weight, particularly about 1 to 2% by weight.

  In the present specification, the “other base resin” may be the same as the base resin having a melting point of 125 to 350 ° C. blended with the plant resin pellet, and the melting point blended with the other base resin and the plant resin pellet. The base resin at 125 to 350 ° C. may be the same resin or different resins.

  When a molded product is produced, a colorant is blended with other base resin, or a colorant dispersed in another base resin is blended, so that the molded product (mixed product) is light or dark. It can be colored in various colors such as red, blue, brown, yellow, orange, purple, green, yellow-green, amber, light blue, and pink.

  The plant powder may be treated with a wax-based resin material having a melting point of 40 to 155 ° C., separated once, and then processed into a pellet by treatment with a base resin having a melting point of 125 to 350 ° C. The plant powder has a melting point of 40 to 155. After processing with a wax-based resin material at ℃ and coating the surface of the plant powder with a wax-based resin material with a melting point of 40-155 ° C, the same equipment (for example, mixer, heating high speed mixer, kneader, heating kneader, pelletizer, etc.) ) May be pelletized by treatment with a base resin having a melting point of 125 to 350 ° C. continuously or sequentially. By processing with a base resin having a melting point of 125 to 350 ° C., it is possible to perform injection molding under the same conditions as the resin with a conventional injection molding machine.

  The temperature during the treatment may be a temperature equal to or higher than the melting point, and in the case of at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C, a lubricant and a dispersant, about 40 to 160 ° C, In the case of a base resin having a melting point of 125 to 350 ° C., a temperature of about 125 to 250 ° C. is mentioned. Such temperature may be raised by frictional heat during stirring / kneading by a mixer or kneader, and may be heated to a predetermined temperature by a heater in the case of a heating mixer or kneader.

  It is preferable to add water, hot water or hot water into the system when kneading at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and plant powder. If the plant powder has a certain amount of water, it is not necessary to add water, but if the water is added so that the plant powder has a predetermined moisture, then a base resin having a melting point of 125 to 350 ° C. is used. In addition, it is because pelletization becomes easy when obtaining plant-based resin pellets.

  In the case of a base resin having a melting point of 125 to 350 ° C., the target plant-based resin pellet is obtained by heating and pelletizing a mixture containing the plant powder coated with the base resin and the wax-based resin material in the pelletizer above the melting point. Can be obtained.

  The wax-based resin material is not particularly limited. For example, plant waxes such as candelilla wax, carnauba wax, rice wax, wax wax, jojoba oil wax, animal waxes such as beeswax and whale wax; montan waxes, etc. Mineral wax, paraffin wax, petroleum wax such as microcrystalline wax, Fischer-Tropsch wax, low molecular weight polyethylene wax, polyolefin wax such as low molecular weight polypropylene wax, oxidation type polyethylene wax and oxidation type polypropylene wax Type polyolefin wax, higher fatty acid wax, higher fatty acid ester wax, castor oil, vegetable oil and the like. These waxes may be used alone or in combination of two or more. A wax resin material having a melting point of 40 to 155 ° C. can be used, but a wax resin material having a softening point of 40 to 155 ° C. may be used.

  In the plant-based resin pellet of the present invention, since the base resin is already dispersed, even if another base resin is added, unevenness is difficult to occur. When a colorant is added to the base resin, the flow length of the wood flour, the base resin and the colorant can be easily adjusted, and a color excellent in appearance can be achieved.

  As the base resin, either a thermosetting resin or a thermoplastic resin may be used, and as the thermoplastic resin, either an amorphous plastic or a crystalline plastic may be used. Specifically, polyvinyl chloride, polystyrene, acrylonitrile-styrene (AS) resin, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate, polyethylene, polypropylene, polybutylene, fluororesin, polyamide, polyacetal, ethylene-vinyl acetate copolymer Examples include coalesce (EVA), melamine resin, polyester, silicone resin, epoxy resin, phenol resin, copolymers thereof, and elastomers. The polyethylene may be any of high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (L-LDPE), and the polypropylene includes metallocene polypropylene. Polyester includes polyethylene terephthalate (PET) and polybutylene terephthalate. Examples of elastomers include styrene elastomers, urethane elastomers, olefin elastomers, and vinyl chloride elastomers. Blend polymers may be used.

  Examples of the MFR (melt flow rate) of the base resin include 5 to 2200. Here, the melt flow rate (MFR) of the polyolefin resin is measured in accordance with JISK 7210.

  The plant powder is not particularly limited. For example, cedar, bamboo, pine, firewood, lauan, teak, and other coniferous and hardwood timber pieces, sawdust, sawdust, bamboo, plum fruit seeds, bamboo, fir, palm, coffee A dried product or non-dried product such as coffee beans, straw, rice, corn cobmeal, and tea leaves after extraction can be used after being pulverized as necessary to obtain an appropriate average particle size.

  The average particle diameter of the plant powder is preferably 30 to 2000 μm, more preferably 50 to 1500 μm, further preferably 100 to 1000 μm, particularly preferably 250 to 1000 μm, and most preferably 300 to 700 μm.

  If the average particle size is large, nozzle clogging can be avoided by using extrusion molding.

  Here, the average particle diameter of the above-mentioned plant powder means a value of an opening corresponding to 50% by weight of the plant powder classified by a sieve to create a cumulative weight% curve with respect to the opening. A method for obtaining a plant powder having such an average particle size is not particularly limited, and examples thereof include a method of making a plant or a dried product thereof into a powder using a pulverizer.

  In the present invention, it is preferable to use a plant powder having a moisture content of 10% by weight or less by drying the plant powder at, for example, 50 to 60 ° C. for 30 to 40 hours. If the water content of the plant powder exceeds 10% by weight, when molding is performed using synthetic resin pellets, bubbles may be generated in the molded product, resulting in a decrease in mechanical strength and a loss of appearance. There is. A more preferable water content is 2% by weight or less.

  In addition, additives such as compatibilizing agents, melt-up agents, flame retardants, antistatic agents, heat-resistant agents, weathering agents, antioxidants, nucleating agents, maleic anhydride and the like are appropriately added to the plant-based resin pellets of the present invention. Mix. These can be blended with at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and one or both of the base resins, and is preferably blended with the base resin. The antioxidant can be preferably blended in the coating layer because it can prevent oxidation of the plant powder.

  Furthermore, in the present invention, an adhesive such as CMC (carboxymethyl cellulose resin) or polyvinyl alcohol (for example, poval) can be mixed as appropriate as an additive.

  As additives, antioxidants, light stabilizers, nucleating agents, heavy metal deactivators, flame retardants, PVA, peroxides, reducing agents, surfactants, emulsifiers, foaming agents, organic peroxides, dehydrating agents Etc.

  Organic peroxide decomposes thermally at a relatively low temperature, or reacts with a reducing substance to easily generate free radicals (free radicals). Examples of the properties of the generated free radicals include addition reactions to unsaturated double bonds and abstraction reactions such as hydrogen.

  In one embodiment, the method for producing the plant resin pellet of the present invention is selected from the group consisting of 70 to 95 parts by weight of plant powder, a wax resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant. At least one kind of 0.01 to 30 parts by weight, and if necessary, nucleating agent or maleic anhydride, an additive such as a binder, water or hot water / heat (about 200 ° C. or less) is further added and mixed, and a mixer, kneader The vegetable powder coated with at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant is taken out as pellets or powder from a pelletizer or the like. The extracted powdery or pelletized mixture can be used as a molding compound as it is, but may be further melt-kneaded with an extruder or a pelletizer to be pelletized. The temperature can be heated to at least one melting point or softening point selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, for example, a melting point or a softening point of about + 20 ° C. . This temperature may be set by a heater when a heating type apparatus is used, or heat may be generated by friction during mixing or kneading, and the temperature may be raised to a necessary temperature.

  Next, a plant powder coated with at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and a melting point of 125 to 350 ° C. with respect to 70 to 95 parts by weight of the plant powder. Base resin (by weight ratio plant powder: base resin = 70: 30 to 5:95, preferably 70:30 to 10:90, more preferably 70:30 to 20:80, more preferably 70:30 to 30: 70, particularly preferably 70:30 to 40:60), and melt-kneaded with a pelletizer to obtain plant resin pellets. The temperature can be heated by the heater to a temperature equal to or higher than the melting point or softening point of the base resin, for example, the melting point or softening point + 20 ° C.

  As the pelletization method, for example, a single screw extruder or a twin screw extruder is used, the cylinder temperature and the die temperature are set to the melting point or more, and the pelletization method is adopted while eliminating the residual moisture in the plant powder from the holes. The Thus, the plant resin pellet of the present invention is obtained. Moreover, as a pelletizing method, for example, a method of pelletizing by injection molding or extrusion molding can be employed.

  Water blended with at least one selected from the group consisting of plant powder and a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant is a step of kneading and pelletizing the coating step and the next base resin. Furthermore, since the resulting plant-based resin pellet is gradually evaporated after molding, the desired plant-based resin pellet can be obtained even when a large amount of water is used.

  In the present invention, the skin layer or matrix containing at least one coating layer selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant and / or a base resin having a melting point of 125 to 350 ° C. is white. If a white colorant such as a pigment (titanium oxide) is added, the plant-based resin pellets become white or a light color close to white, which is advantageous when the molded product is colored.

  The plant-based resin pellet of the present invention can be molded as it is, the base resin exemplified above (which may be the same as or different from the base resin of the pellet), a colorant, a further compatibilizing agent, Add additives such as melt-up agents, flame retardants, antistatic agents, heat-resistant agents, weathering agents, antioxidants, and knead to reduce the proportion of plant powder and increase the proportion of base resin to produce molded products May be.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples of the present invention.

  The present invention is not limited to the following examples.

Example 1
(1) Manufacture of masterbatch 93% by weight of wood flour (average particle size 700 μm), L-Crysta (wax resin material, manufactured by Idemitsu Kosan Co., Ltd.) 3.5% by weight, additive 3.5% by weight, 15 parts by weight of water with respect to 100 parts by weight of the mixture is put into a heating high-speed mixer, heated to a temperature of about 80 ° C. and stirred to coat the wood flour with a wax-based resin material, and the “masterbatch” Got.
(2) Manufacture of premixed product The polypropylene and the masterbatch obtained in (1) above are charged into a twin screw extruder at a weight ratio of 1: 1, and further flame retardants, weathering agents, heat resistance agents, compatibilizing agents, and melt adjustments. An appropriate amount of the agent was added and kneaded to obtain a compound (plant-based resin pellet of the present invention, hereinafter referred to as “premix product”).
(3) Manufacture of mixed product Polypropylene (PP) was mixed with the premixed product obtained in (2) above at a weight ratio of premixed product: PP = 6: 4, and injection molded to obtain a mixed product. .

  The obtained mixed product had a good physical property value and was a high-quality product.

Examples 2-7
Each component was mix | blended in the ratio shown in the following Table 1, the pellet was manufactured similarly to Example 1 (1)-(2), and also the mixed article was obtained similarly to Example 1 (3). The obtained mixed product was a high-quality product having good physical property values and dimensional stability, sinking, warping, shrinkage and the like being in an acceptable range and excellent weather resistance and light resistance.

Example 8
In Example 1, it was carried out except that titanium oxide (white pigment) was used for the polypropylene used for the production of the premixed product at 1.67% by weight (1% by weight based on the mixed product) with respect to the premixed product. A mixture was obtained in the same manner as in Example 1. The obtained mixed product had a whitish (easy coloring) natural texture. In the obtained mixture, a whitish color was not sufficiently recognized, and it was not easy to add a colorant to other colors. Table 2 shows the evaluation of the appearance (unevenness, colorability) of the obtained mixed product.

Examples 9-14
In Table 1, instead of 90% by weight of wood flour, 88.33% by weight of wood flour and 1.67% by weight of titanium oxide (1% by weight with respect to the mixed product) were used, and the total weight of the mixed product Except that 1% by weight of red, blue, yellow, green, orange or pink pigment was used with polypropylene (PP) used for the manufacture of the mixture, the same as in Examples 2-7. A mixed product was obtained. Table 2 shows the evaluation of the appearance (unevenness, colorability) of the obtained mixed product.

Comparative Example 1
In Example 1, instead of the L-crystallizer in the production of the master batch, polypropylene as the base resin was used, and titanium oxide was used for the polypropylene used for the production of the premix product. A mixed product was obtained in the same manner as in Example 1 except that 1% by weight (1% by weight based on the mixed product) was used. Table 2 shows the evaluation of the appearance (unevenness, colorability) of the obtained mixed product.

Comparative Examples 2-7
In Table 1 (Examples 2 to 4), 88.33% by weight of wood flour and 1.67% by weight of titanium oxide (1% by weight based on the mixture) were used instead of 90% by weight of wood flour, and a lubricant. (2% by weight) and other base resins using PP powder (3% by weight) or PE powder (3% by weight) instead of the dispersant (1% by weight) and used for the production of the mixture The mixed products of Comparative Examples 2 to 4 were prepared in the same manner as in Examples 2 to 4 except that 1% by weight of the pigment of red, blue, or yellow was used for the polypropylene. Obtained.

  In Table 1 (Examples 5 to 7), instead of 90% by weight of wood flour, 88.33% by weight of wood flour and 1.67% by weight of titanium oxide (1% by weight based on the mixture) were used and dispersed. Instead of the agent (3% by weight), ABS powder (3% by weight) or styrene powder (3% by weight) is used, and polypropylene, which is another base resin used for manufacturing the mixture, is green, orange A mixed product of Comparative Examples 5 to 7 was obtained in the same manner as in Examples 5 to 7 except that 1% by weight of any one of the pigments of pink was used with respect to the total weight of the mixed product.

  Table 2 shows the results of evaluating the appearance and unevenness of the mixed products obtained in Comparative Examples 2 to 7.

  As shown in Table 2, the plant-based resin pellets of the present invention (Examples 8 to 14) are composed of only titanium oxide (Example 8) or titanium oxide + other colored pigments (red, blue, yellow, green, orange, (Pink) (Examples 9 to 14) were not colored unevenly in the mixed product and colored well. Further, shrinkage of the resin, sink of the mixed product, and warpage did not substantially occur.

  On the other hand, in the mixed products of Comparative Examples 1 to 7, unevenness occurs in the mixed product due to the blending of titanium oxide and the colorant, and the coloring is poor, and a whitish natural texture due to titanium oxide cannot be obtained (Comparative Example 1). In addition, even when colored pigments were blended, the colors of these colored pigments were dull and uneven in coloring, and could not be recognized sufficiently.

  From these results, it became clear that the plant-based resin pellet of the present invention is very excellent in colorability.

Claims (6)

(1) plant powder, (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and (3) a plant resin containing a base resin having a melting point of 125 to 350 ° C. A plant powder having a coating layer containing at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, on the surface of the plant powder, wherein the plant powder has the coating layer. Plant-based resin pellets dispersed in a base resin having a melting point of 125 to 350 ° C. (1) 70 to 95 parts by weight of plant powder, (2) 0.01 to 30 parts by weight of at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant; The plant-based resin pellet according to claim 1, comprising a base resin having a melting point of 125 to 350 ° C in a weight ratio of plant powder: base resin = 70: 30 to 5:95. The plant-based resin pellet according to claim 1 or 2, further comprising titanium oxide and having a natural color tone that is easily colored. The molded object formed by shape | molding the plant-type resin pellet in any one of Claims 1-3 individually or in combination with other base resin. The molded object formed by mix | blending other base resin and a coloring agent with the plant-type resin pellet in any one of Claims 1-3, and shape | molding. (1) plant powder and (2) at least one selected from the group consisting of a wax-based resin material having a melting point of 40 to 155 ° C., a lubricant and a dispersant, and mixing the plant powder with the melting point of 40 to 155 ° C. Coating with at least one selected from the group consisting of a resin-based resin material, a lubricant and a dispersing agent, and then (3) kneading with a base resin having a melting point of 125 to 350 ° C. to produce plant-based resin pellets The manufacturing method of the plant-type resin pellet in any one of Claims 1-3.