JP2006131729A - Resin composition for manufacturing synthetic wood and synthetic wood molding - Google Patents
Resin composition for manufacturing synthetic wood and synthetic wood molding Download PDFInfo
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本発明は、合成木材製造用の樹脂組成物、およびその樹脂組成物を原料として製造された合成木材成形品に関する。さらに詳しくは、外観が木質に類似した成形品（合成木材製品）が得られる樹脂組成物、およびその樹脂組成物を原料として製造されてなる合成木材成形品に関する。 The present invention relates to a resin composition for producing synthetic wood, and a synthetic wood molded article produced using the resin composition as a raw material. More specifically, the present invention relates to a resin composition from which a molded article (synthetic wood product) having an appearance similar to wood can be obtained, and a synthetic wood molded article manufactured using the resin composition as a raw material.
従来、いわゆる合成木材は、天然木材チップ、木粉などを主原料とし結合剤によって結合したものから、合成樹脂のみを原料としたもの、など種々のものが提案されている。これら合成木材成形品（製品）の用途は、屋内用、屋外用など多様であるが、例えば、リフォーム用床材として使用可能な合成木材として、熱可塑性樹脂、木粉、酸変性ポリオレフィン樹脂からなる樹脂組成物を原料として、製造されたものが提案されている（特許文献１参照）。 Conventionally, various so-called synthetic timbers have been proposed, such as natural wood chips, wood flour, etc., which are combined with a binder, and those using only synthetic resin as a raw material. There are various uses of these synthetic wood molded products (products) such as indoor use and outdoor use. For example, as synthetic wood that can be used as a flooring material for renovation, it is composed of thermoplastic resin, wood powder, and acid-modified polyolefin resin. Produced using a resin composition as a raw material has been proposed (see Patent Document 1).
しかしながら、ここに提案されている合成木材は、その製品形状が複雑であったり、高い物性を要求される屋外で使用される製品であったり、木質に酷似した製品外観が要求される製品であったりするときには、材料の成形性、製品の物性・外観などの点で、十分満足すべきものではなかった。例えば、木質に酷似した外観の製品を得ることを目的として、原料組成物中の木粉量を組成物全体の３０重量％を超える割合とすると、原料組成物の成形性、得られる製品の物性が極端に低下するという不都合を生ずる。さらに、成形性についていえば、製品全体としては肉薄でありながら、部分的に肉厚部と肉薄部とを有する成形品にあっては、肉薄部を成形金型のとおりに成形することは困難となる。
本発明者らは、合成木材成形品(製品)にとっては木質に酷似した外観を呈することが極めて重要な要素であることに鑑み、木質に酷似した外観の製品を得ることを目的として、原料組成物中の木粉の量を増量しても、成形性が低下し難い原料樹脂組成物を提供すべく鋭意検討した結果、本発明に至ったものである。すなわち、本発明の目的は次の通りである。
１．成形性が良好で各種形状に成形可能で、かつ、木質に酷似した外観を呈する成形品（合成木材製品）が得られる合成木材用樹脂組成物を提供すること。
２．木質に酷似した外観を呈し、屋内、屋外で使用可能な各種形状の成形品（合成木材製品）を提供すること。
In view of the fact that it is a very important factor for synthetic wood molded products (products) to exhibit an appearance very similar to wood, the raw material composition is intended to obtain a product with an appearance very similar to wood As a result of intensive studies to provide a raw material resin composition in which the moldability is not easily lowered even when the amount of wood flour in the product is increased, the present invention has been achieved. That is, the object of the present invention is as follows.
1. To provide a resin composition for synthetic wood, which is capable of forming a molded product (synthetic wood product) that has good moldability, can be molded into various shapes, and has an appearance very similar to wood.
2. To provide molded products (synthetic wood products) of various shapes that have an appearance very similar to wood and can be used indoors and outdoors.
上記課題を解決するため、第一発明は、ポリオレフィン樹脂２０〜９５重量部と、木粉８０〜５重量部とからなる主体組成物１００重量部に対し、相溶化剤として酸変性ポリオレフィン樹脂を０．１〜１０重量部、滑剤を１〜２０重量部それぞれ配合されてなる、ことを特徴とする合成木材用樹脂組成物を提供する。 In order to solve the above problems, the first invention is based on 0 to 95 parts by weight of a polyolefin resin and 100 parts by weight of a main composition composed of 80 to 5 parts by weight of wood flour. Provided is a synthetic wood resin composition comprising 1 to 10 parts by weight and 1 to 20 parts by weight of a lubricant.
また、第二発明は、ポリオレフィン樹脂２０〜９５重量部と、木粉８０〜５重量部とからなる主体組成物１００重量部に対し、相溶化剤として酸変性ポリオレフィン樹脂を０．１〜１０重量部、滑剤を１〜２０重量部それぞれ配合されてなる、ことを特徴とする合成木材用樹脂組成物を用いて製造されたものである、ことを特徴とする合成木材成形品を提供する。 The second invention is based on 100 to 10 parts by weight of a main composition comprising 20 to 95 parts by weight of polyolefin resin and 80 to 5 parts by weight of wood flour, and 0.1 to 10 parts by weight of acid-modified polyolefin resin as a compatibilizer. Provided is a synthetic wood molded article characterized by being produced using a resin composition for synthetic wood, wherein 1 to 20 parts by weight of each part and lubricant are blended.
本発明は、次の様な特別に有利な効果を奏し、その産業上の利用価値は極めて大である。
１．本発明に係る合成木材用樹脂組成物は、ポリオレフィン樹脂に対する木粉の配合量を増量しても、相溶化剤が配合されているので、ポリオレフィン樹脂と木粉とのなじみを向上させ、これにより木粉をポリオレフィン樹脂に均一に分散させることができる。また、滑剤が配合されているので、成形品製造時に金型内面の滑りが向上するので、成形品を安定して製造できる。
２．本発明に係る樹脂組成物は、ポリオレフィン樹脂に対する木粉の配合量を増量できるので、木質に酷似した外観を呈する合成木材成形品（製品）が得られる。
３．本発明に係る合成木材用樹脂組成物は、射出成形法、押出成形法を適用して合成木材成形品（製品）の製造が可能であり、優れた成形性を有し、しかも木質様の外観を呈する合成木材成形品を得ることが可能である。
４．本発明に係る合成木材用樹脂組成物は成形性が優れているので、肉厚の薄い部分と厚い部分のある偏肉成形品、断面が上下または左右非対称形状の異型成形品、中空部を有する成形品などを、容易に製造することができる。
５．本発明に係る合成木材成形品は、ポリオレフィン樹脂に対し多量の木粉を含有させたときは、天然木材に酷似した外観を呈し、質感を発揮する。
６．本発明に係る合成木材成形品は、天然木材に酷似した外観を呈するので、屋内、屋外での各種用途に供される。
The present invention has the following particularly advantageous effects, and its industrial utility value is extremely large.
1. Since the resin composition for synthetic wood according to the present invention contains a compatibilizing agent even if the amount of the wood flour is increased relative to the polyolefin resin, it improves the familiarity between the polyolefin resin and the wood flour. Wood powder can be uniformly dispersed in a polyolefin resin. In addition, since the lubricant is blended, the slip of the inner surface of the mold is improved during the production of the molded product, so that the molded product can be produced stably.
2. Since the resin composition according to the present invention can increase the blending amount of the wood powder with respect to the polyolefin resin, a synthetic wood molded article (product) exhibiting an appearance very similar to wood is obtained.
3. The resin composition for synthetic wood according to the present invention is capable of producing a synthetic wood molded article (product) by applying an injection molding method or an extrusion molding method, has excellent moldability, and has a woody appearance. It is possible to obtain a synthetic wood molded product exhibiting
4). Since the resin composition for synthetic wood according to the present invention has excellent moldability, it has an uneven molded product having a thin portion and a thick portion, an atypical molded product having an up-down or left-right asymmetric shape, and a hollow portion. Molded articles and the like can be easily manufactured.
5. When the synthetic wood molded article according to the present invention contains a large amount of wood flour with respect to the polyolefin resin, it exhibits an appearance very similar to that of natural wood and exhibits a texture.
6). Since the synthetic wood molded article according to the present invention has an appearance very similar to natural wood, it is used for various uses indoors and outdoors.
以下、本発明を詳細に説明する。本発明に係る合成木材用樹脂組成物は、ポリオレフィン樹脂を基体樹脂とする。本発明においてポリオレフィン樹脂とは、ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリブテン系樹脂などが挙げられる。ポリエチレン系樹脂とは、ポリエチレン、エチレンを主成分としこれと共重合可能な単量体との共重合体をいう。ポリエチレンには、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、線状低密度ポリエチレンなどが挙げられる。エチレンと共重合可能な単量体として代表的なものとしては、α―オレフィン類であり、具体的には、ブテン、ヘキセン、オクテン、デセンなどが挙げられる。ポリプロピレン系樹脂とは、ポリプロピレン、プロピレンを主成分としこれと共重合可能な単量体との共重合体をいう。プロピレンと共重合可能な単量体として代表的なものとしては、エチレン、α―オレフィン類である。共重合体としては、エチレン・プロピレン共重合体、プロピレン・ブテン共重合体などが挙げられる。ポリオレフィン樹脂は、一種でも二種以上の混合物であってもよい。上記ポリオレフィン樹脂の中では、性能、コストなどの観点からポリエチレン、ポリプロピレンなどが好適である。 Hereinafter, the present invention will be described in detail. The resin composition for synthetic wood according to the present invention uses a polyolefin resin as a base resin. In the present invention, the polyolefin resin includes a polyethylene resin, a polypropylene resin, a polybutene resin, and the like. The polyethylene-based resin refers to a copolymer of polyethylene and ethylene as main components and a monomer copolymerizable therewith. Examples of polyethylene include high density polyethylene, medium density polyethylene, low density polyethylene, and linear low density polyethylene. Representative examples of monomers copolymerizable with ethylene include α-olefins, and specific examples include butene, hexene, octene, and decene. The polypropylene resin refers to a copolymer of polypropylene and propylene as main components and a monomer copolymerizable therewith. Typical monomers copolymerizable with propylene are ethylene and α-olefins. Examples of the copolymer include an ethylene / propylene copolymer and a propylene / butene copolymer. The polyolefin resin may be a single type or a mixture of two or more types. Among the polyolefin resins, polyethylene, polypropylene, and the like are preferable from the viewpoints of performance and cost.
本発明に係る合成木材用樹脂組成物は、上記基体樹脂に、木粉が組合せて配合される。木粉は、合成木材用樹脂組成物から成形品を製造する際に、製品の外観に天然木材に酷似した外観を付与する。本発明において木粉とは、製材工場から排出されるノコギリ屑（木屑、オガ屑）、木材チップ、廃木材の粉砕チップなどが挙げられる。木粉の粒度は、１０〜２００メッシュパス程度のもの、粒径にして２０〜１５０μｍのものが好ましい。 The resin composition for synthetic wood according to the present invention is blended with the base resin in combination with wood flour. When producing a molded product from a resin composition for synthetic wood, wood flour imparts an appearance very similar to natural wood to the appearance of the product. In the present invention, examples of the wood powder include sawdust (wood waste, sawdust), wood chips, waste wood ground chips, and the like discharged from a lumber mill. The particle size of the wood flour is preferably about 10 to 200 mesh pass, and preferably 20 to 150 μm.
本発明に係る合成木材用樹脂組成物は、上記基体樹脂と木粉に、相溶化剤と滑剤とを配合する。本発明において相溶化剤は、基体樹脂と木粉のなじみが悪く両者の界面に気泡が発生するので、極性を有する木粉と無極性の基体樹脂のなじみを持たせる（両者の密着性、接着性を向上させる）ように機能する。本相溶化剤としては、酸変性ポリオレフィン樹脂が挙げられる。変性ポリオレフィン樹脂とは、ポリエチレン系樹脂またはポリプロピレン系樹脂を、不飽和カルボン酸および／またはその誘導体（単量体）の一種または二種以上の混合物によって変性されたものをいう。不飽和カルボン酸および／またはその誘導体としては、アクリル酸、マレイン酸、フマール酸、イタコン酸、シトラコン酸などの不飽和カルボン酸、またはその誘導体、例えば、無水物、アミド、イミド、エステルなどが挙げられる。これらの中では、不飽和ジカルボン酸またはその酸無水物が好適であり、中でもマレイン酸またはその無水物が好適である。基体樹脂がポリエチレンであるときは、無水マレイン酸変性ポリエチレンが好ましく、基体樹脂がポリプロピレンであるときは、無水マレイン酸変性ポリプロピレンが好ましい。 The resin composition for synthetic wood according to the present invention contains a compatibilizing agent and a lubricant in the base resin and wood flour. In the present invention, the compatibilizer is poorly compatible with the base resin and the wood powder, and bubbles are generated at the interface between the two, so that the wood powder having polarity and the nonpolar base resin are compatible (adhesion and adhesion between the two). Function). Examples of the compatibilizing agent include acid-modified polyolefin resins. The modified polyolefin resin means a resin obtained by modifying a polyethylene resin or a polypropylene resin with one or a mixture of two or more of unsaturated carboxylic acid and / or its derivative (monomer). Examples of unsaturated carboxylic acids and / or derivatives thereof include unsaturated carboxylic acids such as acrylic acid, maleic acid, fumaric acid, itaconic acid, and citraconic acid, or derivatives thereof such as anhydrides, amides, imides, and esters. It is done. Of these, unsaturated dicarboxylic acids or acid anhydrides thereof are preferred, and maleic acid or anhydrides thereof are particularly preferred. When the base resin is polyethylene, maleic anhydride-modified polyethylene is preferable, and when the base resin is polypropylene, maleic anhydride-modified polypropylene is preferable.
本発明において滑剤は、成形品を製造する際に成形性、特に押出機口金や金型の金属壁面との滑りを向上させる。滑剤としては、脂肪族炭化水素系滑剤、脂肪酸アマイド系滑剤、金属石鹸系滑剤、などが挙げられる。脂肪族炭化水素系滑剤の具体例としては、マイクロクリスタリンワックス、天然パラフィン、合成パラフィン、ポリオレフィンワックスおよびこれらの部分酸化物、フッ化物、塩化物などが挙げられる。脂肪酸アマイド系滑剤の具体例としては、高級脂肪酸のアマイド、高級脂肪酸のビスアマイドなどが挙げられる。金属石鹸系滑剤としては、ステアリン酸バリウム、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸アルミニウム、ステアリン酸マグネシウムなどが挙げられる。 In the present invention, the lubricant improves the moldability, particularly the slippage between the extruder die and the metal wall surface of the mold when the molded product is produced. Examples of the lubricant include aliphatic hydrocarbon lubricants, fatty acid amide lubricants, metal soap lubricants, and the like. Specific examples of the aliphatic hydrocarbon lubricant include microcrystalline wax, natural paraffin, synthetic paraffin, polyolefin wax, and partial oxides, fluorides and chlorides thereof. Specific examples of fatty acid amide-based lubricants include higher fatty acid amides and higher fatty acid bisamides. Examples of the metal soap lubricant include barium stearate, calcium stearate, zinc stearate, aluminum stearate, magnesium stearate and the like.
本発明に係る合成木材用樹脂組成物は、上記ポリオレフィン樹脂２０〜９５重量部に対し、木粉８０〜５重量部を組合せ配合・混合し、主体組成物とする。主体組成物中の木粉が８０重量部を超えると成形性が不良となり、５重量部未満では成形品の表面の光沢が強く木質感が得られず、いずれも好ましくない。主体組成物の好ましい組合せは、ポリオレフィン樹脂４０〜６０重量部に対し、木粉６０〜４０重量部である。 In the synthetic wood resin composition according to the present invention, 80 to 5 parts by weight of wood flour is combined and mixed with 20 to 95 parts by weight of the polyolefin resin to obtain a main composition. If the wood powder in the main composition exceeds 80 parts by weight, the moldability is poor, and if it is less than 5 parts by weight, the gloss of the surface of the molded product is strong and the wood texture is not obtained, which is not preferable. A preferable combination of the main composition is 60 to 40 parts by weight of wood flour with respect to 40 to 60 parts by weight of the polyolefin resin.
上記主体組成物に組合せ配合・混合する相溶化剤、滑剤の配合割合は、主体組成物１００重量部に対し、相溶化剤を０．１〜１０重量部、滑剤を１〜２０重量部の範囲で選ぶものとする。相溶化剤が０．１重量部未満では、基体樹脂中で木粉の分散性が悪く、また得られる成形品の機械的強度向上が不十分となり、１０重量部を超えると、成形時の加熱により熱劣化を生じ、成形品の機械的強度低下や成形品表面へのブリードアウトを生じ、いずれも好ましくない。滑剤が１重量部未満では、樹脂組成物から成形品を製造する際、溶融樹脂と成形機の金属壁面との滑りが悪く成形性が向上せず、２０重量部を超えると、溶融樹脂と成形機の金属壁面との滑りが高くなりすぎ、押出機やミキサー内での混練が不十分となり成形品の物性が低下するので、いずれも好ましくない。 The mixing ratio of the compatibilizing agent and lubricant mixed and mixed in the main composition is in the range of 0.1 to 10 parts by weight of the compatibilizing agent and 1 to 20 parts by weight of the lubricant with respect to 100 parts by weight of the main composition. It shall be chosen by. If the compatibilizer is less than 0.1 parts by weight, the dispersibility of the wood flour is poor in the base resin, and the mechanical strength of the resulting molded product is insufficiently improved. This causes thermal degradation, resulting in a decrease in mechanical strength of the molded product and bleed-out to the surface of the molded product. If the lubricant is less than 1 part by weight, slippage between the molten resin and the metal wall of the molding machine does not improve when the molded product is produced from the resin composition, and the moldability is not improved. Since the sliding with the metal wall surface of the machine becomes too high, the kneading in the extruder or the mixer becomes insufficient, and the physical properties of the molded product are lowered.
本発明に係る合成木材用樹脂組成物は、上に説明した各成分を、上に説明した割合で配合・混合されたものであるが、樹脂組成物には、必要に応じて他の成分、例えば、溶融張力付与剤のほか、紫外線吸収剤、酸化防止剤、光安定剤、着色剤、熱安定剤、難燃剤、発泡剤、充填材などの各種樹脂添加剤を配合することができる。 The resin composition for synthetic wood according to the present invention is one in which the above-described components are blended and mixed in the proportions described above, but the resin composition includes other components as necessary. For example, in addition to a melt tension imparting agent, various resin additives such as an ultraviolet absorber, an antioxidant, a light stabilizer, a colorant, a heat stabilizer, a flame retardant, a foaming agent, and a filler can be blended.
溶融張力付与剤は、本発明に係る合成木材用樹脂組成物の溶融時の溶融張力を適度に調節するように機能する。溶融張力付与剤としては、ポリテトラフルオロエチレン含有アクリルゴムが挙げられる。合成木材用樹脂組成物に対する溶融張力付与剤の配合量は、主体樹脂１００重量部に対し０．１〜２０重量部の範囲で選ぶのが好ましい。溶融張力付与剤の配合量が０．１重量部未満であると、合成木材用樹脂組成物は十分な溶融張力が得られず高速成形ができず、２０重量部を超えると成形時に溶融樹脂が流動しにくくなり、成形機内での樹脂圧が極端に上昇し、高押出量での成形が困難になる。 The melt tension imparting agent functions to appropriately adjust the melt tension at the time of melting of the synthetic wood resin composition according to the present invention. Examples of the melt tension imparting agent include polytetrafluoroethylene-containing acrylic rubber. The blending amount of the melt tension imparting agent to the synthetic wood resin composition is preferably selected in the range of 0.1 to 20 parts by weight with respect to 100 parts by weight of the main resin. When the blending amount of the melt tension imparting agent is less than 0.1 parts by weight, the resin composition for synthetic wood cannot obtain a sufficient melt tension and cannot be molded at high speed. It becomes difficult to flow, the resin pressure in the molding machine rises extremely, and molding at a high extrusion rate becomes difficult.
紫外線吸収剤としては、ベンゾトリアゾール系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、シアノアクリレート系紫外線吸収剤などが挙げられる。酸化防止剤としては、フェノール系酸化防止剤、硫黄系酸化防止剤、リン系酸化防止剤、アミン系酸化防止剤などが挙げられる。光安定剤としてはヒンダードアミン系光安定剤が挙げられ、着色剤としては染料、顔料などが挙げられる。各耐候助剤は主体樹脂１００重量部に対し０．０５〜５重量部配合することが好ましい。これら樹脂添加剤の配合量は、上記主体組成物１００重量部に対し、０．０１〜５重量部の範囲で選ぶことができる。 Examples of ultraviolet absorbers include benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers. Examples of the antioxidant include phenol-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and amine-based antioxidants. Examples of the light stabilizer include hindered amine light stabilizers, and examples of the colorant include dyes and pigments. Each weathering assistant is preferably added in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of the main resin. The compounding quantity of these resin additives can be selected in the range of 0.01 to 5 parts by weight with respect to 100 parts by weight of the main composition.
本発明に係る合成木材用樹脂組成物を調製するには、まず、上記ポリオレフィン樹脂、木粉、相溶化剤および滑剤、要すれば溶融張力付与剤、樹脂添加剤それぞれ所定量秤量し、ブレンダー、タンブラー、ミキサーなどの従来から知られている配合、混合装置を使用して混合する。ついで、溶融混練機を使用して溶融混練してペレット（粒状）化する。使用できる溶融混練機としては、押出機、加熱ロール、バンバリーミキサーなどが挙げられる。混練して得られたペレットは、相溶化剤の作用によりポリオレフィン樹脂と木粉とは相互に均一に分散した形態となる。このため、本発明に係る合成木材用樹脂組から得られる合成木材成形品は、機械的物性が優れたものとなる。 In order to prepare the resin composition for synthetic wood according to the present invention, first, the polyolefin resin, wood powder, compatibilizer and lubricant, if necessary, a melt tension imparting agent and a resin additive are weighed in a predetermined amount, blender, It mixes using the mixing | blending and mixing apparatuses conventionally known, such as a tumbler and a mixer. Next, it is melt-kneaded using a melt-kneader to form pellets (granular). Examples of the melt kneader that can be used include an extruder, a heating roll, and a Banbury mixer. The pellets obtained by kneading are in a form in which the polyolefin resin and the wood flour are uniformly dispersed by the action of the compatibilizing agent. For this reason, the synthetic wood molded product obtained from the synthetic wood resin set according to the present invention has excellent mechanical properties.
本発明に係る合成木材用樹脂組成物は、通常の熱可塑性樹脂と同様に、射出成形法、押出成形法を適用して、合成木材成形品（製品）を製造することができる。押出成形法では、長さ方向に対し直角に切断した断面が、円形、多角形、環状、コ字型を呈するものなどの外、同じ断面に肉厚部と肉薄部とを有する異型押出し成形品、上下や左右の形状や肉厚が異なる異型押出し成形品などが製造できる。異型押出し成形品を製造する際、成形品の形状によっては、金型内で溶融樹脂の流速差を生じることから、押出量を抑えて低速成形しなければならない場合がある。そのため、樹脂組成物に溶融張力付与剤を配合することが好ましい。合成木材成形品は、木質様の外観を有し、天然木材に近い質感を与え、屋内、屋外において、天然木材の製品に代えて使用できる。合成木材成形品（製品）の用途は、床材、化粧床材、天井材、壁材、デッキ材（浴室、屋外の洗濯物干し場、廊下、靴脱ぎ場、水切り場など、後記図１参照）、浴槽蓋材、目隠し材、ベンチ台、ベンチ背もたれ、牧場杭、牧場柵などが挙げられる。 The synthetic wood resin composition according to the present invention can produce a synthetic wood molded article (product) by applying an injection molding method and an extrusion molding method in the same manner as a normal thermoplastic resin. In the extrusion molding method, the profile cut in a direction perpendicular to the length direction is a profile extrusion molded product having a thick portion and a thin portion in the same cross section, other than a circular, polygonal, annular, or U-shaped cross section. It is possible to manufacture a profile extrusion molded product having different shapes and thicknesses on the upper and lower sides and the right and left sides. When manufacturing a profile extrusion molded product, depending on the shape of the molded product, a flow rate difference of the molten resin occurs in the mold, and thus it may be necessary to perform low speed molding while suppressing the extrusion amount. Therefore, it is preferable to add a melt tension imparting agent to the resin composition. Synthetic wood molded articles have a wood-like appearance, give a texture close to that of natural wood, and can be used in place of natural wood products indoors and outdoors. Synthetic wood molded products (products) are used for flooring, decorative flooring, ceiling materials, wall materials, deck materials (bathrooms, outdoor laundry drying places, corridors, shoe take-off places, drainage places, etc., see Figure 1 below) Tub cover, blindfold, bench stand, bench back, ranch pile, ranch fence.
本発明に係る合成木材成形品（製品）は、木粉の含有量が多い場合には、ポリオレフィン樹脂が紫外線劣化したり、成形品中の木粉が劣化し変色したりする場合があるので、成形品の種類、使用目的によっては、紫外線吸収剤、酸化防止剤、光安定剤、着色剤の群から選ばれる一種または複数の耐候助剤を配合し、成形品に種々の機能を付与することが好ましい。本発明に係る合成木材成形品（製品）は、その表面を、平均粗さ１０〜５００μｍに不規則にサンドブラストなどにより研磨し、より天然木材に近い質感を与え、外観的にも、また触感的にも木質様に酷似させることができる。 When the synthetic wood molded product (product) according to the present invention has a large amount of wood powder, the polyolefin resin may be deteriorated by ultraviolet rays, or the wood powder in the molded product may be deteriorated and discolored. Depending on the type and purpose of use of the molded product, one or more weathering assistants selected from the group consisting of UV absorbers, antioxidants, light stabilizers and colorants may be blended to impart various functions to the molded product. Is preferred. The surface of the synthetic wood molded product (product) according to the present invention is irregularly polished to an average roughness of 10 to 500 μm by sand blasting to give a texture closer to that of natural wood. But it can be made to resemble wood.
以下、本発明を実施例に基づいて詳細に説明するが、本発明はその趣旨を超えない限り、以下に記載した例に限定されるものではない。なお、実施例、比較例中に「部」とあるは「重量部」を意味する。 EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to the example described below, unless the meaning is exceeded. In the examples and comparative examples, “parts” means “parts by weight”.
以下の実施例、比較例において、樹脂組成物の成形性（流速差比率、幅高さ比率、肉厚比率、引落し率、目やに）、得られた成形品（製品）についての物性（耐候性、耐衝撃性）、木肌感、総合判定は次の方法、および基準に従って行った。図１は実施例、比較例において製造した成形品（デッキ材、寸法は後記する。）の一例の斜視図、図２は図１に示した成形品の長さ方向に対して直角方向の断面図、図３は以下に記述する「幅高さ比率」の測定方法を示す説明図である。 In the following examples and comparative examples, the moldability of the resin composition (flow rate difference ratio, width-height ratio, wall thickness ratio, pulling rate, corner), physical properties (weather resistance) of the obtained molded product (product) , Impact resistance), wood texture, and overall judgment were performed according to the following methods and standards. FIG. 1 is a perspective view of an example of a molded product (deck material, dimensions will be described later) manufactured in Examples and Comparative Examples, and FIG. 2 is a cross section perpendicular to the length direction of the molded product shown in FIG. FIG. 3 and FIG. 3 are explanatory views showing a measuring method of “width-height ratio” described below.
（１）流速差比率： 図１に示した左右非対称編肉異型の成形品（上面肉厚：２．５ｍｍ、下面肉厚：１．５ｍｍ）を押出機ダイから押出し、押出機ダイから押出された直後にナイフによって、押出し方向に対して直角方向に、６０秒間隔で６回切り取り、切り取った各成形品上面側の長さと、下面側の長さを測定した。上面側の平均長さ／下面側の平均長さの比率を、流速比率とした。流速比率が３／１以下のものを○、流速比率が３／１を超えるものを×と表示した。
（２）幅高さ比率：図１に示した成形品につき、幅と高さ（図３参照）の比率で評価した。評価結果は、比率が１０／１以上のものを○、比率が１０／１未満から５／１以上のものを△、比率が５／１未満のものを×と表示した。
(1) Flow rate difference ratio: A left-right asymmetric knitted-shaped molded product (top wall thickness: 2.5 mm, bottom wall thickness: 1.5 mm) shown in FIG. 1 is extruded from an extruder die and extruded from an extruder die. Immediately after that, the knife was cut six times at intervals of 60 seconds in a direction perpendicular to the extrusion direction, and the length of the upper surface side and the length of the lower surface side of each cut molded product were measured. The ratio of the average length on the upper surface side / the average length on the lower surface side was defined as the flow rate ratio. A sample having a flow rate ratio of 3/1 or less was indicated by ◯, and a sample having a flow rate ratio exceeding 3/1 by ×.
(2) Width / height ratio: The molded product shown in FIG. 1 was evaluated by the ratio of width to height (see FIG. 3). The evaluation results are indicated as ◯ when the ratio is 10/1 or more, Δ when the ratio is less than 10/1 to 5/1 or more, and × when the ratio is less than 5/1.
(３)引落し率：押出機ダイから樹脂温度１７０℃で押出された成形品を、冷却機を通過させて引取りロールで引取る際に、押出機からの樹脂押出速度よりも速い速度で引取ったときに、押出機ダイと引取りロールの間にある成形品表面にヒビ割れが発生する。このヒビ割れが発生する引取り速度増加分を、引落し率とした。評価結果は、伸び率が４％以上のものを○、伸び率が４％未満から２％未満のものを△、２％未満のものを×と表示した。
(４)目やに：成形品の製造の金型、成形品での目やに（成形時間の経過とともに付着蓄積する焼け樹脂、低分子量物、添加剤等）の発生の有無を目視観察した。評価結果は、目やにの発生が認められないものを○、目やにの発生が認められないものを×と表示した。
(3) Pulling rate: When a molded product extruded from the extruder die at a resin temperature of 170 ° C. is passed through a cooler and taken up by a take-up roll, at a speed faster than the resin extrusion speed from the extruder. When taken, cracks occur on the surface of the molded product between the extruder die and the take-up roll. The increase in the take-up speed at which this cracking occurs was taken as the draw-down rate. The evaluation results are indicated by ○ when the elongation is 4% or more, Δ when the elongation is less than 4% to less than 2%, and × when the elongation is less than 2%.
(4) Eyes: The presence or absence of the occurrence of molds (molded resin, low molecular weight substances, additives, etc. that adhere and accumulate with the lapse of molding time) in the molds and molds of the molded products was visually observed. The evaluation results were indicated as “◯” when no occurrence was observed in the eyes and “X” when no occurrence was observed in the eyes.
(５)耐衝撃性：ＪＩＳ Ｋ７１１１に準拠し、２３℃で測定した成形体のシャルピー衝撃値（ＫＪ／ｍｍ２）を測定した。評価結果は、３ＫＪ／ｍｍ２以上のものを○、３ＫＪ／ｍｍ２未満から２ＫＪ／ｍｍ２以上のものを△、２ＫＪ／ｍｍ２未満のものを×と表示した。
(６)耐候性：サンシャイン型ウェザーメーター（スガ試験機社製、型式：ＷＥ−ＳＵＮ−ＨＣ・Ｂ・ＢＲ）を使用し、５００ｈｒ暴露後の暴露前との色差ΔＥを測定した。評価結果は、ΔＥが１０未満のものを○、ΔＥが１１〜２０のものを△、ΔＥが２０を超えるものを×と表示した。
(5) Impact resistance: Based on JIS K7111, the Charpy impact value (KJ / mm 2 ) of the molded body measured at 23 ° C. was measured. The evaluation results, 3 kJ / mm 2 or more of the ○, those from less than 3 kJ / mm 2 of 2 kJ / mm 2 or more △, displayed as × of less than 2 kJ / mm 2.
(6) Weather resistance: A sunshine type weather meter (manufactured by Suga Test Instruments Co., Ltd., model: WE-SUN-HC / B / BR) was used to measure the color difference ΔE after exposure for 500 hours. The evaluation results are indicated as ◯ when ΔE is less than 10, Δ when ΔE is 11 to 20, and × when ΔE exceeds 20.
（８)木肌感：光沢計（スガ試験機社製、型式：ＵＧＶ−５Ｄ）成形品表面に入射角６０°で光を照射し、その反射量（％）で評価した。評価結果は、光沢度３０％以下のものを○、光沢度３０％を超えるものを×と表示した。
（９）総合判定：上記（１）〜（８）の評価項目で、×が一個もないものを○、一個でも×があるものを×と判定した。
(8) Wood texture: Gloss meter (manufactured by Suga Test Instruments Co., Ltd., model: UGV-5D) The surface of the molded product was irradiated with light at an incident angle of 60 °, and the reflection amount (%) was evaluated. The evaluation results are indicated as “◯” when the gloss is 30% or less, and “X” when the gloss exceeds 30%.
(9) Comprehensive determination: In the evaluation items (1) to (8) above, a case where there was no x was judged as ◯, and a case where there was at least one x was judged as x.
［実施例１］
ポリオレフィン樹脂として、ポリプロピレン（出光石油化学社製、銘柄名：Ｂ−７８０）４８部、木粉（カジノ社製、商品名：セルロシンＮ０１００）５２部の主体組成物１００部に対し、相溶化剤として無水マレイン酸変性ポリプロピレン（三洋化成工業社製、商品名：ユーメックス１０１０）２部、滑剤としてステアリン酸亜鉛（日東化成社製）８部、溶融張力付与剤としてポリテトラフルオロエチレン含有アクリルゴム（三菱レイヨン社製、商品名：メタブレンＡ３０００）５部、紫外線吸収剤としてベンゾトリアゾール系紫外線吸収剤（チバ・スペシャリティケミカルズ社製、商品名：チヌビン３２６）０．１部、酸化防止剤として有機リン系酸化防止剤（三洋化成工業社製、商品名：サノールＬＳ７７０）０．５部、および着色剤（茶色顔料）３部をそれぞれ秤量し、ヘンシェルミキサー（三井三池社製）によって撹拌混合して樹脂組成物を得た。
[Example 1]
As a polyolefin resin, as a compatibilizer for 100 parts of a main composition of 48 parts of polypropylene (made by Idemitsu Petrochemical Co., Ltd., brand name: B-780) and 52 parts of wood flour (product name: Cellulosin N0100) 2 parts of maleic anhydride modified polypropylene (manufactured by Sanyo Chemical Industries, trade name: Yumex 1010), 8 parts of zinc stearate (manufactured by Nitto Kasei) as a lubricant, polytetrafluoroethylene-containing acrylic rubber (Mitsubishi Rayon) as a melt
得られた樹脂組成物の成分を表−１に、コニカル異方向２軸押出機（シンシナティエクストルージョン社製、型式：タイタン５８）によって溶融混練し、幅３００ｍｍ、高さ３０ｍｍ、肉厚２．５ｍｍの一方の端部が雄形状で、他方の端部が雌形状の左右非対称形状のデッキ材用成形品（製品）が得られるように設計された金型（成形品の斜視図を図１に、長さ方向に対して直角方向の断面図を図２に、それぞれ示した。）を使用して押出し、冷却して、デッキ材用の成形品を製造した。得られた成形品について上記方法で評価し、その評価結果を表−２に示した。 The components of the obtained resin composition are shown in Table 1 and melt-kneaded by a conical different-direction twin screw extruder (manufactured by Cincinnati Extrusion Co., Ltd., model: Titan 58), width 300 mm, height 30 mm, wall thickness 2.5 mm FIG. 1 shows a mold (a perspective view of a molded product) designed to obtain a molded article (product) for a deck material having one end of a male shape and the other end of a female shape. A cross-sectional view perpendicular to the longitudinal direction is shown in FIG. 2, respectively, and extruded and cooled to produce a molded article for a deck material. The obtained molded product was evaluated by the above method, and the evaluation results are shown in Table-2.
［実施例２］
実施例１に記載した例において、ポリプロピレンをポリエチレン（日本ポリエチレン社製、ノバテックＨＤ ＨＢ４２２ＲＰ）に代えた外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について上記方法で同様に評価し、その評価結果を表−２に示した。
[Example 2]
In the example described in Example 1, except that polypropylene was changed to polyethylene (Nippon Polyethylene, Novatec HD HB422RP) (see Table-1 for details), the same procedure as in Example 1 was used for the deck material. A molded article was produced. The obtained molded product was similarly evaluated by the above method, and the evaluation results are shown in Table 2.
［実施例３］
実施例１に記載した例において、ポリオレフィン樹脂をポプロピレン３３．６部とポリエチレン（日本ポリエチレン社製、商品名：ノバテックＨＤ ＨＢ４２２ＲＰ）１４．４部の混合物に代えた外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形体を製造した。得られた成形品について上記方法で同様に評価し、その評価結果を表−２に示した。
[Example 3]
In the example described in Example 1, except that the polyolefin resin was replaced with a mixture of 33.6 parts of polypropylene and 14.4 parts of polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name: Novatec HD HB422RP) (for details, see Table- 1), a molded article for a deck material was produced in the same procedure as in Example 1. The obtained molded product was similarly evaluated by the above method, and the evaluation results are shown in Table 2.
［実施例４］
実施例１に記載した例おいて、ポリオレフィン樹脂をポプロピレン４８部とエチレンプロピレンゴム（出光石油化学社製、商品名：ＴＰＯ Ｊ−５７１０）０．１部の混合物に代え、また木粉の量を５１．９部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について上記方法で同様に評価し、その評価結果を表−２に示した。
[Example 4]
In the example described in Example 1, the polyolefin resin was replaced with a mixture of 48 parts of propylene and 0.1 part of ethylene propylene rubber (manufactured by Idemitsu Petrochemical Co., Ltd., trade name: TPO J-5710), and the amount of wood flour Was changed to 51.9 parts (see Table 1 for details), and a molded article for deck material was produced in the same procedure as in Example 1. The obtained molded product was similarly evaluated by the above method, and the evaluation results are shown in Table-2.
［実施例５］
実施例１に記載した例おいて、ポリオレフィン樹脂をポプロピレン４８部とエチレンプロピレンゴム（出光石油化学社製、商品名：ＴＰＯ Ｊ−５７１０）５部の混合物に代え、また木粉の量を４７部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形体を製造した。得られた成形体について上記方法で同様に評価し、その評価結果を表−２に示した。
[Example 5]
In the example described in Example 1, the polyolefin resin was replaced with a mixture of 48 parts of propylene and 5 parts of ethylene propylene rubber (manufactured by Idemitsu Petrochemical Co., Ltd., trade name: TPO J-5710), and the amount of wood flour was 47. Except for the change to the part (see Table 1 for details), a molded article for deck material was produced in the same procedure as in Example 1. The obtained molded body was similarly evaluated by the above method, and the evaluation results are shown in Table-2.
［実施例６］
実施例１に記載した例において、ポリオレフィン樹脂をポプロピレン４８部とエチレンプロピレンゴム（出光石油化学社製、商品名：ＴＰＯ Ｊ−５７１０）１５部の混合物に代え、また木粉の量を３７部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について上記方法で同様に評価を行い、その結果を表−２に示した。
[Example 6]
In the example described in Example 1, the polyolefin resin was replaced with a mixture of 48 parts of propylene and 15 parts of ethylene propylene rubber (manufactured by Idemitsu Petrochemical Co., Ltd., trade name: TPO J-5710), and the amount of wood flour was 37 parts. Except for the change to (see Table 1 for details), a molded article for a deck material was produced in the same procedure as in Example 1. The obtained molded product was similarly evaluated by the above method, and the results are shown in Table-2.
［実施例７］
実施例１に記載した例において、ポリプロピレンの量を９５部に、また木粉の量を５部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について上記方法で同様の評価を行い、その結果を表−２に示した。
[Example 7]
In the example described in Example 1, except that the amount of polypropylene was changed to 95 parts and the amount of wood flour was changed to 5 parts (for details, refer to Table-1), the deck was processed in the same procedure as in Example 1. A molded product for the material was produced. The obtained molded product was evaluated in the same manner as described above, and the results are shown in Table-2.
［実施例８］
実施例１に記載した例おいて、ポリプロピレンの量を２０部に、また木粉の量を８０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順出デッキ材用の成形体を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 8]
In the example described in Example 1, except that the amount of polypropylene was changed to 20 parts and the amount of wood flour was changed to 80 parts (see Table-1 for details), the same procedure as in Example 1 was started. A molded body for a deck material was produced. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例９］
実施例１に記載した例において、無水マレイン酸変性ポリプロピレンの量を０．１部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 9]
In the example described in Example 1, except that the amount of maleic anhydride-modified polypropylene was changed to 0.1 part (for details, see Table 1), molding for deck material was performed in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１０］
実施例１に記載した例において、無水マレイン酸変性ポリプロピレンの量を１０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形体を得た。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 10]
In the example described in Example 1, except that the amount of maleic anhydride-modified polypropylene was changed to 10 parts (for details, see Table 1), a molded article for deck material was prepared in the same procedure as in Example 1. Obtained. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１１］
実施例１に記載した例において、ステアリン酸亜鉛の量を１部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 11]
In the example described in Example 1, except that the amount of zinc stearate was changed to 1 part (see Table 1 for details), a molded article for deck material was manufactured in the same procedure as in Example 1. . The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１２］
実施例１に記載した例において、ステアリン酸亜鉛の量を２０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表２−に示した。
[Example 12]
In the example described in Example 1, except that the amount of zinc stearate was changed to 20 parts (see Table 1 for details), a molded article for a deck material was manufactured in the same procedure as in Example 1. . The same evaluation was performed on the obtained molded product, and the results are shown in Table 2-.
［実施例１３］
実施例１に記載した例において、ポリテトラフルオロエチレン含有アクリルゴムの量を０．１部に変更した外は（詳細は、表−１参照）、実施例１と同様にしてデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 13]
In the example described in Example 1, except that the amount of the polytetrafluoroethylene-containing acrylic rubber was changed to 0.1 part (for details, see Table 1), the molding for the deck material was performed in the same manner as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１４］
実施例１に記載した例において、ポリテトラフルオロエチレン含有アクリルゴムの量を２０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 14]
In the example described in Example 1, except that the amount of the polytetrafluoroethylene-containing acrylic rubber was changed to 20 parts (for details, refer to Table-1), molding for deck material was performed in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１５］
実施例１に記載した例において、ポリテトラフルオロエチレン含有アクリルゴムの量を０部に変更した以外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 15]
In the example described in Example 1, except that the amount of the polytetrafluoroethylene-containing acrylic rubber was changed to 0 part (for details, refer to Table 1), molding for deck material was performed in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１６］
実施例１に記載した例において、ポリテトラフルオロエチレン含有アクリルゴムの量を２５部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 16]
In the example described in Example 1, except that the amount of the polytetrafluoroethylene-containing acrylic rubber was changed to 25 parts (for details, refer to Table-1), molding for deck material was performed in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［実施例１７］
実施例１に記載した例において、紫外線吸収剤、酸化防止剤、着色剤の各量を０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Example 17]
In the example described in Example 1, except that the amounts of the ultraviolet absorber, the antioxidant, and the colorant were changed to 0 parts (for details, refer to Table 1), the deck was processed in the same procedure as in Example 1. A molded product for the material was produced. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例１］
実施例１に記載した例において、ポリプロピレンの量を１００部に、また木粉の量を０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 1]
In the example described in Example 1, the deck was changed in the same procedure as in Example 1 except that the amount of polypropylene was changed to 100 parts and the amount of wood flour was changed to 0 parts (for details, see Table 1). A molded product for the material was produced. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例２］
実施例１に記載した例において、ポリプロピレンの量を１０部に、また木粉の量を９０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 2]
In the example described in Example 1, the deck was changed in the same procedure as in Example 1 except that the amount of polypropylene was changed to 10 parts and the amount of wood flour was changed to 90 parts (see Table 1 for details). A molded product for the material was produced. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例３］
実施例１に記載した例において、無水マレイン酸変性ポリプロピレンの量を０．０５部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 3]
In the example described in Example 1, except that the amount of the maleic anhydride-modified polypropylene was changed to 0.05 part (for details, see Table 1), the molding for the deck material was performed in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例４］
実施例１に記載した例において、無水マレイン酸変性ポリプロピレンの量を１０部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 4]
In the example described in Example 1, except that the amount of maleic anhydride-modified polypropylene was changed to 10 parts (for details, see Table-1), a molded article for deck material was prepared in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例５］
実施例１に記載した例において、ステアリン酸亜鉛の量を０．１部に変更した外は（詳細は、表−１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 5]
In the example described in Example 1, except that the amount of zinc stearate was changed to 0.1 part (see Table 1 for details), a molded article for deck material was prepared in the same procedure as in Example 1. Manufactured. The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
［比較例６］
実施例１に記載した例において、ステアリン酸亜鉛の量を３０部に変更した外は（詳細は、表１参照）、実施例１におけると同様の手順でデッキ材用の成形品を製造した。得られた成形品について同様の評価を行い、その結果を表−２に示した。
[Comparative Example 6]
In the example described in Example 1, a molded article for a deck material was produced in the same procedure as in Example 1 except that the amount of zinc stearate was changed to 30 parts (see Table 1 for details). The obtained molded product was evaluated in the same manner, and the results are shown in Table-2.
表−１および表−２より、次のことが明らかとなる。
１．本発明に係る合成木材用樹脂組成物は、成形性が優れているので、肉厚の薄い部分と厚い部分のある偏肉成形品、断面が左右非対称形状の異型成形品を、容易に製造することができる（実施例１〜実施例１７参照）。
２．本発明に係る合成木材用樹脂組成物は、ポリオレフィン樹脂に対し多量の木粉が配合されているので、得られる成形品は天然木材に酷似した外観を呈し、天然木材と同等の質感を発揮する。
３．これに対して、木粉を添加しない比較例１の樹脂組成物か得られる成形品は、表面光沢が高く、天然木材の木肌感が得られない。
４．また、比較例２の樹脂組成物は請求項１で規定する量よりも多い木粉が配合されているので、得られる成形品は耐衝撃性が低い。
５．さらに比較例３の樹脂組成物は、相溶化剤の配合量が請求項１で規定する量より少ないので、各成分は均一に分散されず、得られる成形品は耐衝撃性が低い。
６．比較例４の樹脂組成物は、相溶化剤の配合量が請求項１で規定する量より多いので、得られる成形品は耐衝撃性が低い。
７．比較例５の樹脂組成物は、滑剤のステアリン酸亜鉛の量が少ないので、溶融樹脂は成形機の金属面との滑りが低下し、口金表面に目やにが生じた。
８．比較例６の樹脂組成物は、滑剤のステアリン酸亜鉛の量が多すぎるので押出機内部での充分な溶融混練が行われず、樹脂組成物各成分の分散性の低下を生じ、得られる成形品は耐衝撃性が低い。
From Table-1 and Table-2, the following becomes clear.
1. Since the resin composition for synthetic wood according to the present invention is excellent in moldability, it is easy to produce an uneven molded product having a thin portion and a thick portion, and an atypical molded product having an asymmetrical cross section. (See Example 1 to Example 17).
2. Since the resin composition for synthetic wood according to the present invention contains a large amount of wood flour with respect to the polyolefin resin, the obtained molded product has an appearance very similar to that of natural wood and exhibits the same texture as natural wood. .
3. On the other hand, the molded product obtained from the resin composition of Comparative Example 1 to which no wood powder is added has a high surface gloss and does not provide a natural wood texture.
4). Further, since the resin composition of Comparative Example 2 contains more wood flour than the amount specified in
5. Furthermore, since the resin composition of Comparative Example 3 has a smaller amount of compatibilizer than the amount specified in
6). In the resin composition of Comparative Example 4, since the blending amount of the compatibilizing agent is larger than the amount specified in
7). In the resin composition of Comparative Example 5, since the amount of the zinc stearate as the lubricant was small, the slip of the molten resin with the metal surface of the molding machine was reduced, and eyes were formed on the die surface.
8). In the resin composition of Comparative Example 6, since the amount of zinc stearate as a lubricant is too large, sufficient melt-kneading is not performed inside the extruder, resulting in a decrease in dispersibility of each component of the resin composition, and a molded product obtained. Has low impact resistance.
本発明に係る合成木材用樹脂組成物は、通常の熱可塑性樹脂と同様に、射出成形法、押出成形法を適用して、合成木材成形品（製品）を製造することができる。合成木材成形品は、木質様の外観を有し、天然木材に近い質感を与え、屋内、屋外において、天然木材の製品に代えて使用できる。合成木材成形品（製品）の用途は、床材、化粧床材、天井材、壁材、デッキ材（浴室、屋外の洗濯物干し場、廊下、靴脱ぎ場、水切り場など）、浴槽蓋材、目隠し材、ベンチ台、ベンチ背もたれ、牧場杭、牧場柵などが挙げられる。 The synthetic wood resin composition according to the present invention can produce a synthetic wood molded article (product) by applying an injection molding method and an extrusion molding method in the same manner as a normal thermoplastic resin. Synthetic wood molded articles have a wood-like appearance, give a texture close to that of natural wood, and can be used in place of natural wood products indoors and outdoors. Synthetic wood molded products (products) can be used for flooring, decorative flooring, ceiling materials, wall materials, deck materials (bathrooms, outdoor laundry drying places, corridors, shoe take off places, drainage grounds, etc.), bathtub lids, These include blindfolds, benches, bench backs, ranch piles, and ranch fences.
１：上面側
２：下面側
３：中空部
４：雄型結合部
５：雌型結合部
６：厚さ測定箇所
1: upper surface side 2: lower surface side 3: hollow portion 4: male coupling portion 5: female coupling portion 6: thickness measurement location
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