JP4206802B2 - Wood resin foam molding and decorative material - Google Patents

Description

【００３８】
熱可塑性樹脂１０〜７０ｗｔ％、木質系充填剤５〜５０ｗｔ％、平均粒径２〜１０μｍのタルク５〜１０ｗｔ％、平均粒径０．３〜２μｍのタルク５〜４０ｗｔ％を含有し、且つセルカプロセスにより発泡していることを特徴とする木質樹脂発泡成形体の表面に、前記木質樹脂発泡成形体に含有される熱可塑性樹脂と同系の熱可塑性樹脂を主体とする化粧シートが積層されてなることを特徴とする化粧材は木質感があり、切削加工性が良く、衝撃性に優れ、且つ、優れた表面平滑性や意匠と木質感、リサイクル性、安定した発泡性とを併せ持つ化粧材であることが確認された。
【００３９】
【発明の効果】
本発明品化粧シートによる高意匠性を生かしてこれまで木質樹脂成形品の意匠では用いにくかった建築内装材、建具、家電品の表面材などにも使用しやすくなった。また公知の各種後加工がおこなえ、これまでのＭＤＦや合板と同等の使いやすさを実現した。また、衝撃性が向上したため複雑な形状でも細部の耐久性が高まり耐久性が増した。また同種の樹脂の発泡層を設けたものについては床材として不陸を吸収することや断熱効果の性能向上、遮音効果等もリサイクル性を犠牲にすることなく期待できる。
【図面の簡単な説明】
【図１】本発明の木質樹脂発泡成形体及び化粧材の実施の形態を示す側断面図である。
【符号の説明】
１ 木質樹脂発泡成形体
１１ 芯部
１２ 表面
１３ ポリオレフィン系樹脂
１４ 木質系充填剤
１５ タルク（大）
１６ タルク（小）
１７ 木質樹脂組成物
１８ 気泡
２ 化粧シート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood resin foam molded article and a decorative material used for building interior materials such as floor materials, wall materials, and ceiling materials, joinery, and surface materials of home appliances.
[0002]
[Prior art]
Conventionally, a decorative material is often used in which a decorative veneer or a decorative sheet with a design applied to a natural veneer, paper, or a synthetic resin sheet is bonded to a woody base material such as plywood or fiberboard. However, these decorative materials have problems in physical properties such as worm-eaten and corrosion of wooden base materials, and are difficult to recycle, and most of them are treated by landfill or incineration.
[0003]
In addition, some decorative sheets are pasted on a resin base material by profile extrusion, etc., but these decorative materials do not have a defect due to the wooden base material, and even if the appearance of the wood design decorative sheet is like wood, the specific gravity There are problems such as lack of wood texture in terms of rigidity and rigidity, and difficulty in workability such as cutting and nailing, and it can be used only in limited parts.
[0004]
In recent years, many attempts have been made to provide a wood resin molded article containing a thermoplastic resin and a wood filler for applications such as building interior materials, flooring materials, joinery, and surface materials for home appliances. However, these molded articles are excellent in recyclability, workability such as cutting and nailing, and wood texture, but the design is poor. It is also conceivable to attach a surface material such as natural veneer, decorative paper, or decorative sheet to these molded products. However, since it is difficult to separate the molded product from the surface material, the recyclability of the folded molded product is difficult. There was a concern that the problem of not being fully utilized.
[0005]
On the other hand, the inventors mainly have a thermoplastic resin similar to the thermoplastic resin contained in the wood resin molding on the surface of the wood resin molding containing the thermoplastic resin and the wood filler. A decorative material characterized in that a decorative sheet is laminated, and foaming the decorative material, and a decorative material and foam molding having good wood texture, workability such as cutting and nailing, etc., and having both excellent design and recyclability The inventor has invented a cosmetic material to be processed by the Celca process, but the non-foamed type has a higher specific gravity as the content of the wood powder increases, and the lightness and heat insulating properties, which are the advantages of the wood material, are impaired. In addition, for foaming types, when the molding method is sheet molding or when the resin is foamed after exiting the mold, it is molded into the normal sizing die, and the foaming variation due to outgassing from the surface or the rigidity of the molding itself There is a problem that the parts that can be used are limited due to lack of. Further, even in molding using the SELKA process, surface gloss unevenness due to a decrease in dimensional accuracy due to non-uniform foaming due to outgassing and a decrease in impact strength have been problems.
[0006]
[Patent Document 1]
JP 2001-098114 A
[0007]
[Patent Document 2]
JP 2001-260292 A
[0008]
[Patent Document 3]
JP 2001-353815 A
[0009]
[Patent Document 4]
JP 2002-120347 A
[0010]
[Problems to be solved by the invention]
The subject of the present invention is that the wood texture, heat insulation, workability such as cutting and nailing is good, and it has light weight and excellent recyclability, and also has excellent surface smoothness and gloss unevenness. An object of the present invention is to provide a wood resin foam molded article and a decorative material.
[0011]
[Means for Solving the Problems]
Means for solving the problem according to claim 1 of the present application is that at least a part of the surface is non-foamed or low-foamed, the core is highly foamed, and the non-foamed or low-foamed surface is the same as the core. What is claimed is: 1. A wood resin foam molded article characterized by having a cerca structure comprising a resin containing 10 to 70 wt% of a thermoplastic resin having a composition, 5 to 50 wt% of a wood filler and 5 to 50 wt% of talc. It is to provide.
[0012]
Means for solving the problem according to claim 2 of the present application is the same as the thermoplastic resin contained in the wood resin foam molded body on part or all of the surface of the wood resin foam molded body according to claim 1. The present invention provides a decorative material in which a decorative sheet mainly composed of a thermoplastic resin is laminated.
[0014]
Claims of the present application 3 Means for solving the problem relating to the above is characterized in that an average particle size of the wood-based filler is 1 to 200 μm. Claim 1 Wood resin foam molding Or according to claim 2 A cosmetic material is provided.
[0015]
Claims of the present application 4 Means for solving the problem according to the present invention is characterized in that the thermoplastic resin is a polyolefin resin. Claim 1 or 3 Wood resin foam molding Or according to claim 2 or 3 A cosmetic material is provided.
[0016]
Claims of the present application 5 Means for solving the problem relating to the above is characterized in that the expansion ratio in the core portion of the wood resin foam molded article is 1.4 to 4.0 times. Claim in any one of Claim 1, 3, 4 Wood resin foam molding Or any one of claims 2-4 A cosmetic material is provided.
[0017]
Claims of the present application 6 The means for solving the problem according to claim is characterized in that the decorative sheet has a wood grain design. 2-5 A cosmetic material according to any one of the above is provided.
[0018]
Claims of the present application 7 The means for solving the problem according to claim is characterized in that the decorative sheet has transparency. 2-5 A cosmetic material according to any one of the above is provided.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
First, at least a part of the surface is non-foamed or low-foamed, the core is highly foamed, and the non-foamed or low-foamed surface and the core have the same composition of 10 to 70 wt% of a thermoplastic resin and a wood-based filler A woody resin foam molded article having a selka structure made of a resin containing 5 to 50 wt% and talc 5 to 50 wt% will be described.
Cosmetics with excellent cutting and nailing properties due to the inclusion of wooden fillers, cosmetics with high surface smoothness and high designability due to the inclusion of talc, and a decorative sheet mainly composed of similar resins The material can be reused as a material for the wood resin molding without separating the decorative sheet and the wood resin molding during recycling, and the recycled product does not impair the wood texture.
In addition, because the wood resin molding contains a wood-based filler, if the decorative sheet is a wood grain design, there is a wood texture in the mouth that can be seen by cutting or grooving, and because it is a foam, It is lightweight and has high heat insulating properties, and since it is molded by the SELKA process, it has a feature that a skin layer is formed and the surface is smooth and scratched.
[0020]
The material for the wood filler and talc can be selected without any particular limitation, but the average particle diameter of the wood filler is preferably 1 to 200 μm, particularly preferably 5 to 100 μm. When the average particle size is less than 1 μm, it is difficult to handle, and particularly when the amount of the wood-based filler is large, if the dispersion into the resin is poor, the mechanical strength is lowered. Moreover, it is because the uniformity, planarity, and mechanical strength of a molded product will fall when larger than 200 micrometers.
Moreover, it is preferable to mix talc 5-10 wt% with an average particle diameter of 2-10 micrometers and talc 5-40 wt% with an average particle diameter 0.3-2 micrometers of talc. Talc with an average particle size of 2 to 10 μm is mixed with 5 to 10 wt% to stabilize foaming, and the effect of keeping the surface smooth is obtained. Also, talc with an average particle size of 0.3 to 2 μm is mixed with 5 to 40 wt%. This is because the impact strength is improved.
[0021]
The amount of the wood filler is 5 to 50 wt%, the amount of talc having an average particle size of 2 to 10 μm is 5 to 10 wt%, and the amount of talc having an average particle size of 0.3 to 2 μm is 5 to 40 wt%. However, in order to improve moldability and homogeneity, the total amount of the wood filler and talc is preferably 20 to 80 wt%, more preferably 25 to 60 parts by weight.
Furthermore, it is preferable that the blending weight ratio of the wood filler is greater than that of talc in order to maintain the wood texture due to the wood filler and particularly to maintain good machinability.
In addition, it is preferable to increase the blending weight ratio of talc having an average particle size of 0.3 to 2 μm for applications requiring higher impact strength.
[0022]
The thermoplastic resin can be selected as appropriate from resins such as polyolefin, polystyrene, polycarbonate, polyester, polyamide, polyvinyl alcohol, acrylic, polyvinyl chloride, etc., but dioxins are generated during incineration and outflow of environmental hormones during landfill. In order to satisfy performance such as weather resistance and heat resistance as a member and resistance to chemicals and solvents, the thermoplastic resin is preferably a polyolefin resin.
[0023]
Polyolefin used here is polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-ethyl. Acrylate copolymers, those obtained by acid modification for the purpose of improving adhesiveness, ionomers and the like can be selected as appropriate, and they may be single or mixed.
However, in order to maintain the physical properties after recycling, the better compatibility shows the better results. For example, in the case of polyethylene and polypropylene, when incompatible resins such as lamination are mixed, these are compatible. More preferably, for example, an ethylene-propylene copolymer is added. In particular, in order to increase the adhesiveness, it is desirable to increase the compounding ratio of the acid-modified resin so that the resin itself has polarity and to improve the adhesiveness with the wood filler.
Further, in order to improve foamability, it is desirable that the melt tension is high. However, in the Selka process, it is possible to foam well even with a resin having a low melt tension as compared with sheet molding or ordinary profile foam extrusion molding. However, if you are worried about outgassing, especially when high loading of wood powder, use of grades with long chain branching by electron beam crosslinking, control of molecular weight distribution, and fluorine additives that increase melt tension It is desirable to adjust the melt tension as necessary by a known method such as blending.
In addition, heat stabilizers, acid neutralizers, UV absorbers, light stabilizers, colorants such as pigments and dyes, fillers, antistatic agents, lubricants, nucleating agents, flame retardants, antiblocking agents as necessary Further, a light scattering agent, a gloss adjusting agent, etc. for making translucent can be added.
Among these additives, hindered phenols, sulfurs, phosphoruss, etc. as heat stabilizers, stearic acid metal salts, hydrotalcite, etc. as acid neutralizers, benzotriazoles, benzoates as ultraviolet absorbers, etc. -Based, benzophenone-based, triazine-based, light stabilizer as hindered amine-based, flame retardant as halogen-based flame retardant, phosphorus-based flame retardant, chlorine-based flame retardant, etc., filler as calcium carbonate, silica, titanium oxide, Barium sulfate, zinc oxide, alumina, talc, mica, magnesium silicate, potassium titanate, magnesium sulfate, aluminum hydroxide, magnesium hydroxide, iron oxide, carbon black, metal powder, etc., lubricants include hydrocarbon lubricants, fatty acids, Higher alcohol, fatty acid amide, metal soap, ester, fluorine, etc. Nucleating agents include carboxylic acid metal salt, sorbitol, and phosphate ester metal salts, and pigments include condensed azo, insoluble azo, quinacridone, isoindolinone, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide There are pearl pigments such as iron oxide and mica, and these additives are generally used in any combination.
[0024]
Any known technique can be used for the foaming technique.
Generally, it can be classified into chemical foaming that generates gas by thermal decomposition or chemical reaction, and physical foaming that vaporizes by applying heat to a low boiling point liquid. Chemical foaming agents include inorganic sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, ammonium nitrite, sodium borohydride, light metals, azide compounds, and organic foaming agents include azo, nitroso, hydrazide, etc. Can be used in any combination. In particular, physical foaming is mainly used for foaming at a high foaming ratio exceeding 2 times, and carbon dioxide gas and aliphatic hydrocarbons are mainly used as foaming agents. In addition, a chemical foaming agent is often used in combination with physical foaming to adjust the cell shape of the foam.
[0025]
In the present invention, it is preferable that recycling is possible without significant change in physical properties even when mixed with a similar thermoplastic resin. Specific examples include polyolefin-based, polystyrene-based, polycarbonate-based, polyester-based, polyamide-based, polyvinyl alcohol-based, acrylic-based, and polyvinyl chloride-based resins. For example, polyolefin resins include polyethylene, polypropylene, polybutene, polyisoprene, Ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-ethyl acrylate copolymer and acid modification for the purpose of improving adhesion The same or different resins selected from these can be used for woody resin moldings and decorative sheets.
[0026]
The important points about the decorative sheets to be laminated are mainly the use of a thermoplastic resin similar to the molded product and the printing of designs such as wood grain, stone grain, cloth pattern, abstract pattern, etc. There are no restrictions on the configuration. For example, a single-layer decorative sheet printed on a colored sheet, a reverse-layer decorative sheet in which a transparent sheet is bonded to a sheet printed on a colored sheet by a dry lamination method, an extrusion lamination method, a thermal lamination method, or the like A back-printed single-layer decorative sheet or the like printed on the back surface can be appropriately selected depending on the application. At this time, if the decorative sheet has sufficient concealment, a stable design can be reproduced, and conversely, if the decorative sheet has transparency, it is possible to express the design using the wood texture of the wooden resin molded body.
The ink used for printing may be appropriately selected from nitrified cotton, cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, acrylic, polyester and the like alone or each modified product. These may be any of aqueous, solvent-based and emulsion types, and can be arbitrarily selected from a one-component type or a two-component type using a curing agent. Further, the ink can be made effective by irradiation with ultraviolet rays or electron beams. Among them, the most common method is a method of curing with an isocyanate using a urethane-based ink.
In addition to these binders, colorants such as pigments and dyes, extender pigments, solvents, and various additives contained in ordinary inks are added. Particularly frequently used pigments include condensed azo, insoluble azo, quinacridone, isoindolinone, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide, iron oxide, mica and other pearl pigments.
In any decorative sheet, the primer coat for bonding to the molded body, the top coat for surface protection and gloss adjustment, the conduit expression by the embossing method and the gloss mat method, etc. may be reduced to a small extent. Absent. Moreover, the additive used for a thermoplastic resin layer can use the same thing as a molded object.
[0027]
The kneading of the wood filler, talc and thermoplastic resin is not particularly limited, but the kneading with a Banbury mixer or Henschel mixer, pelletizing with a pelletizer, and mixing and pelletizing with a twin screw extruder kneader are common. Is. Further, if the wood filler and talc have a high water content, foaming may be caused during molding. Therefore, it is desirable to suppress the water content to 8% or less with a dryer or a hopper dryer before kneading. Also, the wood filler and talc may be kneaded and pelletized separately and blended appropriately during molding.
When the product of the present invention is recycled, the crushed invention product is added with a wood filler, talc, thermoplastic resin, various additives, etc. as necessary, and pelletized again. In this case, the method is not particularly limited.
Further, the wood-based filler and the resin may be kneaded simultaneously with the molding of the wood resin molded body.
[0028]
The selka structure is a structure obtained by the selka method or a structure equivalent thereto.
The Celca method is a state in which an extrusion mold having an exit dimension that is almost the same as or slightly smaller than the entrance dimension of the cooling sizing mold is used, and the exit of the extrusion mold and the entrance of the cooling sizing mold are almost in close contact with each other. Then, by extruding the foamable resin composition from the extrusion mold, the foamable resin composition is introduced into the cooling sizing mold in a state where the foaming hardly proceeds, and the cooling sizing mold is mainly used. This is a foam extrusion method in which foaming is performed inside.
The SELKA structure is not limited to the structure by the above method, and at least a part of the surface is non-foamed or low-foamed, the core is highly foamed, and the non-foamed or low-foamed surface and the core have the same composition. It is made of resin and is characterized in that the core and the surface have a continuous structure.
In the case of the case obtained by the Celca method, as shown in FIG. 1, as the structure, polyolefin resin 13 such as polypropylene, woody filler 14 such as wood powder, talc (large) 15, talc (Small) A woody resin composition 17 containing 16 as a main component is molded into a desired shape while appropriately foaming (forming bubbles 18 in the core) by adding a foaming agent or the like.
In FIG. 1, the surface and the core are expressed so as to form separate layers, but the core and the surface are actually continuous and there is no interface.
In the example shown in FIG. 1, the surface 12 is provided so as to surround the entire surface of the core portion 11. However, the multi-layer structure is not limited to this, and the surface 12 is made of wood resin foam. What is necessary is just to be formed at least in the part by which the rigidity in the surface of the molded object 1 and surface strength are requested | required. For example, in the case of a flat wall material or floor material, the surface 12 may be formed only on the indoor side surface (upper surface) of the core portion 11 or from the indoor side surface (upper surface) to a part or all of the end surface.
As a molding method that can be molded continuously and stably in a single process using a single type of expandable wood resin composition 15, the Selca method is most preferred.
[0029]
For this, depending on the thickness of the molded body and the expansion ratio, an extrusion mold in which a torpedo (also called a mandrel or a core) is attached to the inside of the extrusion mold, or a resin from a hole provided in the torpedo is used. In some cases, a method of extruding is used.
In addition, since the core part in this case has a continuous structure up to the surface as a whole, it is difficult to clearly distinguish from other parts, but the foaming rate that is substantially away from the surface is high. It refers to the part and the part with the same expansion ratio.
[0030]
In this Celca method, the surface layer portion of the molded body is pressed against the inner surface of the cooling sizing mold immediately after being extruded from the extrusion mold, and is therefore rapidly cooled. The surface layer part of non-foaming or low foaming ratio is automatically formed on the surface and the core part of high foaming ratio is automatically formed inside, which is also called the inward forming process. .
[0031]
In the Celca method, the difference between the outlet shape of the extrusion mold and the inlet shape of the cooling sizing mold is made different depending on the cross section, and the surface of the foamable resin composition extruded from the extrusion mold is cooled and sized. By changing the cooling rate according to the surface part, such as by changing the timing of contact with the inner surface of the mold depending on the surface part, the surface of the non-foamed or low-foaming ratio only on a part of the surface of the foam molded product It is also possible to form
[0032]
In many cases, a fitting structure such as male and female for connecting the decorative materials to each other is provided on the side surface of the wood resin foam molded article as the base material of the decorative material. Since the combined structure portion is a thin-walled portion with an intricate structure, the contact area with the cooling sizing mold is increased by the SELKA method, and there is an advantage that a non-foamed or low-foamed fitting structure portion can be easily formed. is there.
In addition, when the fitting structure portion is provided in this way, it is continuous from the decorative surface over the surface of the portion of the wood resin foam molded body that can be seen from the decorative surface (surface exposed to the outside) side at least in the connected state. It is desirable to laminate a decorative sheet.
[0033]
The expansion ratio of the core of the wood resin foam molded body is arbitrary depending on the intended use. For example, if it is a flooring material for indoor use such as a house, the rigidity, surface strength, scratch resistance, and pressure scar Considering the balance of various aspects such as property, heat insulation, flexibility, tactile sensation, walking sensation, flexibility, and workability, the foaming ratio of the core is preferably 1.4 to 4.0 times.
[0034]
【Example】
70 parts by weight of homopolypropylene resin, 30 parts by weight of homopolypropylene modified with maleic acid, 60 parts by weight of a wood-based filler having an average particle size of 20 μm, which was crushed by a ball mill and pulverized with a ball mill. A wood resin composition was prepared by mixing and pelletizing 10 parts by weight of talc having an average particle diameter of 8 μm and 30 parts by weight of talc having an average particle diameter of 1 μm by a twin-screw extrusion kneader. This wood resin composition is foamed 1.4 times by chemical foaming with a baking soda-citric acid-based foaming agent, formed into a rectangular parallelepiped shape having a cross section of 5 mm × 300 mm by the SELKA process, and further subjected to corona discharge treatment on the surface. A virgin woody resin foam molding was prepared.
On the other hand, 100 μm colored polypropylene sheet formed by blending pigments such as iron oxide and titanium oxide with random polypropylene was printed with grain of urethane ink, and homo PP was embossed with a thickness of 100 μm by extrusion lamination method. A decorative sheet laminated at the same time was prepared, and a primer coat was applied to the back surface and a top coat was applied to the surface to prepare a polyolefin resin decorative sheet.
After that, a polyolefin resin decorative sheet was bonded to the surface of the wood polyolefin resin foamed molded article by a lapping method to produce a virgin cosmetic material of the example.
In addition, after crushing this virgin cosmetic material, it was pelletized again with a single screw extruder, and this was again foamed 1.4 times by chemical foaming with a baking soda-citric acid-based foaming agent, and the cross section was obtained by the Celca process. The molded product was formed into a rectangular parallelepiped shape of 5 mm × 300 mm, and further subjected to corona discharge treatment on the surface to produce a recycled wood resin foam molded product.
After that, a polyolefin resin decorative sheet was bonded to the surface of the recycled woody polyolefin resin molded body by a lapping method to prepare a recycled decorative material of the example.
[0035]
(Comparative Example 1)
70 parts by weight of homopolypropylene resin, 30 parts by weight of homopolypropylene modified with maleic acid, 60 parts by weight of a wood-based filler having an average particle diameter of 20 μm, which is crushed by a ball mill and pulverized with a ball mill. 40 parts by weight of talc having an average particle diameter of 8 μm was mixed and pelletized by a twin-screw extruder kneader to prepare a wood resin composition. This resin composition is foamed 1.4 times by chemical foaming with a baking soda-citric acid-based foaming agent, formed into a rectangular parallelepiped shape having a cross section of 5 mm × 300 mm by the Celca process, and further subjected to corona discharge treatment on the surface. Thus, a virgin resin foam molded article was prepared.
On the other hand, 100 μm colored polypropylene sheet formed by blending pigments such as iron oxide and titanium oxide with random polypropylene is printed with a grain of urethane ink, and homo PP is embossed with a thickness of 100 μm by the extrusion laminating method. A decorative sheet laminated simultaneously was prepared, and a polyolefin resin decorative sheet was prepared by applying a primer coat on the back surface and a top coat on the surface.
After that, a polyolefin resin decorative sheet was bonded to the surface of the polyolefin resin molded body by a lapping method to prepare a virgin cosmetic material of Comparative Example 1.
In addition, after crushing this virgin cosmetic material, it is re-pelletized by a single screw extruder, and again foamed 1.4 times by chemical foaming with a baking soda-citric acid-based foaming agent, and the cross section is obtained by the Celca process. The product was molded into a rectangular parallelepiped shape having a rectangle of 5 mm × 300 mm, and further subjected to corona discharge treatment on the surface to prepare a resin foam molded product of a recycled product.
After that, a polyolefin resin decorative sheet was bonded to the surface of the recycled polyolefin resin molded article by a lapping method to prepare a recycled decorative material of Comparative Example 1.
[0036]
The virgin products and recycled products of Examples and Comparative Examples 1 to 3 were evaluated for cutting workability, variation in foaming ratio of molded products, impact strength by drop test, and moldability of recycled products. In addition, the design and wood texture were also evaluated visually and by touch.
The evaluation results are shown in Table 1.
[0037]
[Table 1]

[0038]
Contains 10 to 70 wt% thermoplastic resin, 5 to 50 wt% wood filler, 5 to 10 wt% talc with an average particle size of 2 to 10 µm, 5 to 40 wt% talc with an average particle size of 0.3 to 2 µm, and A decorative sheet mainly composed of a thermoplastic resin similar to the thermoplastic resin contained in the wood resin foam molded body is laminated on the surface of the wood resin foam molded body characterized by being foamed by a process. This decorative material has a wood texture, good machinability, excellent impact, and has a combination of excellent surface smoothness, design, wood texture, recyclability, and stable foaming. It was confirmed that there was.
[0039]
【The invention's effect】
Taking advantage of the high designability of the decorative sheet of the present invention, it has become easy to use it for building interior materials, fittings, and surface materials for household electrical appliances that have been difficult to use in the design of wooden resin molded products. In addition, various known post-processing was performed, and the ease of use equivalent to conventional MDF and plywood was realized. In addition, because of improved impact properties, the durability of details increased and the durability increased even in complex shapes. In addition, in the case where a foam layer of the same kind of resin is provided, it can be expected to absorb unevenness as a flooring material, to improve the performance of the heat insulation effect, and the sound insulation effect without sacrificing the recyclability.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a woody resin foam molded article and a decorative material of the present invention.
[Explanation of symbols]
1 Wood resin foam molding
11 core
12 Surface
13 Polyolefin resin
14 Wood filler
15 Talc (Large)
16 Talc (small)
17 Woody resin composition
18 bubbles
2 Makeup sheet

Claims (7)

At least a part of the surface is non-foamed or low-foamed, the core is highly foamed, and the non-foamed or low-foamed surface and the core have the same composition of 10 to 70 wt% and wood filler 5 It has a cerca structure composed of a resin containing 50 wt%, 5-10 wt% talc having an average particle diameter of 2-10 μm, and 5-40 wt% talc having an average particle diameter of 0.3-2 μm. Wood resin foam molding. A decorative sheet mainly composed of a thermoplastic resin similar to the thermoplastic resin contained in the wood resin foam molded body is laminated on a part or all of the surface of the wood resin foam molded body according to claim 1. A cosmetic material characterized by The woody resin foam molded article according to claim 1 or the cosmetic material according to claim 2, wherein the woody filler has an average particle diameter of 1 to 200 µm. 4. The woody resin foam molded article according to claim 1 or 3 , or the decorative material according to claim 2 or 3, wherein the thermoplastic resin is a polyolefin resin. The woody resin foamed molded woody resin foam-molded body according to any claims 1, 3 and 4 expansion ratio in the core portion, characterized in that a 1.4 to 4.0 times the, or claim Cosmetic material in any one of 2-4 . The decorative material according to any one of claims 2 to 5 , wherein the decorative sheet has a wood grain design. The decorative material according to any one of claims 2 to 5 , wherein the decorative sheet has transparency.

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