JP7380969B2 - Method for producing plant fiber reinforced resin composition - Google Patents
Method for producing plant fiber reinforced resin composition Download PDFInfo
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- JP7380969B2 JP7380969B2 JP2019186073A JP2019186073A JP7380969B2 JP 7380969 B2 JP7380969 B2 JP 7380969B2 JP 2019186073 A JP2019186073 A JP 2019186073A JP 2019186073 A JP2019186073 A JP 2019186073A JP 7380969 B2 JP7380969 B2 JP 7380969B2
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- 239000011342 resin composition Substances 0.000 title claims description 53
- 239000000835 fiber Substances 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000000203 mixture Substances 0.000 claims description 37
- 229920005989 resin Polymers 0.000 claims description 37
- 239000011347 resin Substances 0.000 claims description 37
- 238000004898 kneading Methods 0.000 claims description 22
- 235000013311 vegetables Nutrition 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 229920003043 Cellulose fiber Polymers 0.000 claims description 4
- 229920005672 polyolefin resin Polymers 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- -1 polypropylene Polymers 0.000 description 12
- 239000004743 Polypropylene Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 229920001155 polypropylene Polymers 0.000 description 11
- 239000000654 additive Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 101000837308 Homo sapiens Testis-expressed protein 30 Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 102100028631 Testis-expressed protein 30 Human genes 0.000 description 1
- 125000004018 acid anhydride group Chemical group 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Landscapes
- Reinforced Plastic Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulding By Coating Moulds (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Description
本発明は、植物繊維強化樹脂組成物の製造方法に関する。 The present invention relates to a method for producing a plant fiber reinforced resin composition.
セルロース等の植物繊維を配合して強度を高めた樹脂組成物は、多分野で利用されている。このような樹脂組成物は、植物繊維及び樹脂に加え、利用目的に応じて物性を改善するための添加剤を用いて製造される場合がある。例えば、特許文献１には、ゴム含有ポリマーを添加した樹脂組成物が記載されている。 BACKGROUND ART Resin compositions with increased strength by blending vegetable fibers such as cellulose are used in many fields. Such a resin composition may be manufactured using, in addition to plant fibers and resin, additives for improving physical properties depending on the purpose of use. For example, Patent Document 1 describes a resin composition to which a rubber-containing polymer is added.
特許文献１に記載の樹脂組成物に添加されるゴム含有ポリマーは、樹脂組成物の柔軟性を向上させる一方で、剛性を低下させるおそれがある。
本発明は上記事情に鑑み、添加物を用いる以外の方法で力学的物性を改善する植物繊維強化樹脂組成物の製造方法を提供することを課題とする。
The rubber-containing polymer added to the resin composition described in Patent Document 1 may improve the flexibility of the resin composition, but may reduce the rigidity.
In view of the above circumstances, it is an object of the present invention to provide a method for producing a plant fiber-reinforced resin composition that improves mechanical properties by a method other than using additives.
上記課題を解決するための具体的手段には、以下の実施態様が含まれる。
＜１＞樹脂と植物繊維とを含む混合物を押出機を用いて混練する工程を有し、前記樹脂は少なくとも２つの投入口から前記押出機に投入される、植物繊維強化樹脂組成物の製造方法。
＜２＞前記少なくとも２つの投入口のうち、最も上流側の投入口と最も下流側の投入口との間における混合物に含まれる植物繊維の含有率が最終的に得られる樹脂組成物に含まれる植物繊維の含有率よりも大きい、＜１＞に記載の植物繊維強化樹脂組成物の製造方法。
＜３＞前記少なくとも２つの投入口のうち、最も上流側の投入口と最も下流側の投入口との間における前記混合物に含まれる前記植物繊維の含有率が３０質量％以上である、＜１＞又は＜２＞に記載の植物繊維強化樹脂組成物の製造方法。
＜４＞前記少なくとも２つの投入口のうち、最も下流側の投入口が前記押出機の中央部又は中央部よりも下流部に位置する、＜１＞～＜３＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
＜５＞前記押出機の中央部から上流部及び中央部から下流部のそれぞれに、輸送能力のないニーディングディスクが配置されたスクリューセグメントを備える、＜１＞～＜４＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
＜６＞前記混合物は樹脂を５５質量％～９５質量％及び植物繊維を５質量％～４５質量％含む、＜１＞～＜５＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
＜７＞前記樹脂はポリオレフィン樹脂を含む、＜１＞～＜６＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
＜８＞前記植物繊維はセルロース繊維を含む、＜１＞～＜７＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
＜９＞前記押出機のスクリュー長Ｌ／スクリュー径Ｄ（Ｌ／Ｄ）が３６以上である、＜１＞～＜８＞のいずれか１項に記載の植物繊維強化樹脂組成物の製造方法。
Specific means for solving the above problems include the following embodiments.
<1> A method for producing a plant fiber-reinforced resin composition, comprising the step of kneading a mixture containing a resin and plant fibers using an extruder, and the resin is introduced into the extruder from at least two input ports. .
<2> Of the at least two input ports, the content of plant fibers contained in the mixture between the most upstream side input port and the most downstream side input port is included in the resin composition finally obtained. The method for producing a plant fiber-reinforced resin composition according to <1>, wherein the content is higher than the content of plant fibers.
<3> Of the at least two input ports, the content of the plant fibers contained in the mixture between the most upstream side input port and the most downstream side input port is 30% by mass or more, <1 > or the method for producing a plant fiber-reinforced resin composition according to <2>.
<4> According to any one of <1> to <3>, the most downstream input port of the at least two input ports is located at a central portion of the extruder or a downstream portion of the central portion. A method for producing a plant fiber reinforced resin composition.
<5> Any one of <1> to <4>, wherein the extruder includes a screw segment in which a kneading disk without transport capacity is arranged in an upstream part from the center and a downstream part from the center. A method for producing a plant fiber-reinforced resin composition according to .
<6> The vegetable fiber reinforced resin composition according to any one of <1> to <5>, wherein the mixture contains 55% to 95% by mass of resin and 5% to 45% by mass of vegetable fibers. Production method.
<7> The method for producing a plant fiber reinforced resin composition according to any one of <1> to <6>, wherein the resin includes a polyolefin resin.
<8> The method for producing a plant fiber reinforced resin composition according to any one of <1> to <7>, wherein the plant fibers include cellulose fibers.
<9> The method for producing a plant fiber reinforced resin composition according to any one of <1> to <8>, wherein the extruder has a screw length L/screw diameter D (L/D) of 36 or more.
本発明によれば、添加物を用いる以外の方法で力学的物性を改善する植物繊維強化樹脂組成物の製造方法が提供される。 According to the present invention, there is provided a method for producing a plant fiber-reinforced resin composition that improves mechanical properties by a method other than using additives.
以下、本発明を実施するための形態について詳細に説明する。但し、本発明は以下の実施形態に限定されるものではない。以下の実施形態において、その構成要素（要素ステップ等も含む）は、特に明示した場合を除き、必須ではない。数値及びその範囲についても同様であり、本発明を制限するものではない。
本明細書において「～」を用いて示された数値範囲には、「～」の前後に記載される数値がそれぞれ最小値及び最大値として含まれる。
EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail. However, the present invention is not limited to the following embodiments. In the following embodiments, the constituent elements (including elemental steps and the like) are not essential unless otherwise specified. The same applies to numerical values and their ranges, and they do not limit the present invention.
In this specification, the numerical range indicated using "~" includes the numerical values written before and after "~" as the minimum value and maximum value, respectively.
本開示の植物繊維強化樹脂組成物（以下、単に樹脂組成物もいう）の製造方法は、樹脂と植物繊維とを含む混合物を押出機を用いて混練する工程を有し、前記樹脂は少なくとも２つの投入口から前記押出機に投入される。 A method for producing a plant fiber-reinforced resin composition (hereinafter also simply referred to as a resin composition) of the present disclosure includes a step of kneading a mixture containing a resin and a plant fiber using an extruder, and the resin has at least two The material is charged into the extruder through two input ports.
上記方法によれば、添加物を用いる以外の方法で樹脂組成物の力学的物性を向上させることができる。その理由は必ずしも明らかではないが、下記のように考えられる。
上記方法では樹脂が２回以上に分割して投入されるため、混練初期の混合物は植物繊維を相対的に多く含み粘度が高い。このため、混合物に充分なせん断応力を与えることが可能になり、植物繊維の開繊が促進される結果、樹脂組成物の力学的物性が向上すると考えられる。
さらに上記方法によれば、従来の方法よりも少ない混練回数で優れた力学的物性を有する樹脂組成物が得られる。このため、生産性向上及び樹脂組成物の劣化（熱による着色等）抑制の点でも有利である。
According to the above method, the mechanical properties of the resin composition can be improved by a method other than using additives. Although the reason is not necessarily clear, it is thought to be as follows.
In the above method, since the resin is added in two or more portions, the mixture at the initial stage of kneading contains a relatively large amount of vegetable fibers and has a high viscosity. Therefore, it is possible to apply sufficient shear stress to the mixture, promoting the opening of the vegetable fibers, and as a result, it is thought that the mechanical properties of the resin composition are improved.
Further, according to the above method, a resin composition having excellent mechanical properties can be obtained with fewer kneading times than conventional methods. Therefore, it is advantageous in terms of improving productivity and suppressing deterioration of the resin composition (coloring due to heat, etc.).
上記方法で使用する二軸押出機の種類は特に制限されない。例えば、樹脂組成物の混練に一般的に使用される二軸押出機、単軸押出機などから選択できる。
押出機のスクリュー長Ｌ（材料の最初の投入口から取出口までの長さ）は特に制限されず、例えば、６００ｍｍ～１６，０００ｍｍであってもよい。
押出機のスクリュー径Ｄは特に制限されず、例えば、１５ｍｍ～４００ｍｍであってもよい。スクリュー径が一定でない場合は、その最小値をスクリュー径Ｄとする。
The type of twin screw extruder used in the above method is not particularly limited. For example, it can be selected from twin-screw extruders, single-screw extruders, etc. that are commonly used for kneading resin compositions.
The screw length L of the extruder (the length from the initial material input port to the material output port) is not particularly limited, and may be, for example, 600 mm to 16,000 mm.
The screw diameter D of the extruder is not particularly limited, and may be, for example, 15 mm to 400 mm. If the screw diameter is not constant, the minimum value is taken as the screw diameter D.
混合物を充分に混練する観点からは、Ｌ／Ｄは３６以上であることが好ましい。生産性及び混合物の劣化抑制の観点からは、Ｌ／Ｄは１２０以下であることが好ましい。 From the viewpoint of sufficiently kneading the mixture, L/D is preferably 36 or more. From the viewpoint of productivity and suppression of deterioration of the mixture, L/D is preferably 120 or less.
樹脂が投入される投入口の押出機における位置は、特に制限されない。混合物に充分なせん断応力を与える観点からは、少なくとも２つの投入口のうち、最も下流側の投入口が押出機の中央部又は中央部よりも下流部に位置することが好ましく、最も下流側の投入口が押出機の中央部と、中央部及び材料の取出口を等分する位置との間に位置することがより好ましい。 The position of the inlet into which the resin is introduced in the extruder is not particularly limited. From the viewpoint of imparting sufficient shear stress to the mixture, it is preferable that the most downstream inlet of at least two inlets be located in the center of the extruder or in a downstream part of the center; More preferably, the input port is located between the center of the extruder and a position that equally divides the center and the material outlet.
混合物に充分なせん断応力を与える観点からは、少なくとも２つの投入口のうち、最も上流側の投入口と最も下流側の投入口との間における混合物に含まれる植物繊維の含有率が、最終的に得られる樹脂組成物に含まれる植物繊維の含有率よりも大きいことが好ましい。具体的には、例えば、３０質量％以上であることが好ましく、４０質量％以上であることがより好ましく、５０質量％以上であることがさらに好ましい。混合物の粘度が高すぎて混練できなくなるのを回避する観点からは、上記含有率は８０質量％以下であることが好ましく、７０質量％以下であることがより好ましく、６０質量％以下であることがさらに好ましい。 From the viewpoint of imparting sufficient shear stress to the mixture, the content of vegetable fibers contained in the mixture between the most upstream input port and the most downstream input port of at least two input ports should be It is preferable that the content is higher than the content of plant fibers contained in the resin composition obtained in . Specifically, for example, it is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more. From the viewpoint of avoiding the viscosity of the mixture being too high to be kneaded, the content is preferably 80% by mass or less, more preferably 70% by mass or less, and 60% by mass or less. is even more preferable.
少なくとも２つの投入口から投入される樹脂の量の割合は、特に制限されない。混合物に充分なせん断応力を与える観点からは、最初に投入される樹脂の量が樹脂全体の２０質量％～８０質量％であることが好ましく、３０質量％～７０質量％であることがより好ましく、４０質量％～６０質量％であることがさらに好ましい。 There is no particular restriction on the ratio of the amounts of resin input from at least two input ports. From the viewpoint of imparting sufficient shear stress to the mixture, the amount of resin initially added is preferably 20% to 80% by mass of the entire resin, more preferably 30% to 70% by mass. , more preferably 40% by mass to 60% by mass.
少なくとも２つの投入口のうち、最も上流側の投入口以外の投入口から投入される樹脂は、溶融状態であっても、固体の状態であってもよい。具体的には、例えば、最も上流側の投入口以外の投入口から昇温機能を備える単軸押出機を用いて溶融状態の樹脂を投入してもよく、昇温機能を備えていないサイドフィーダー等を用いて固体状態の樹脂を投入してもよい。 Of the at least two input ports, the resin input from the input ports other than the most upstream input port may be in a molten state or in a solid state. Specifically, for example, the molten resin may be introduced using a single-screw extruder equipped with a temperature raising function from an input port other than the most upstream input port, and a side feeder without a temperature raising function may be used. A solid state resin may also be introduced using, for example.
少なくとも２つの投入口から投入される植物繊維の量の割合は、特に制限されない。混合物に充分なせん断応力を与える観点からは、最初に投入される植物繊維の量が植物繊維全体の８０質量％～１００質量％であることが好ましい。 There is no particular restriction on the ratio of the amounts of vegetable fibers input from at least two input ports. From the viewpoint of imparting sufficient shear stress to the mixture, it is preferable that the amount of vegetable fiber initially added is 80% by mass to 100% by mass of the total vegetable fibers.
押出機は、中央部から上流部及び中央部から下流部のそれぞれに、輸送能力のないニーディングディスクが配置されたスクリューセグメントを備えていることが好ましい。 Preferably, the extruder is equipped with screw segments in which kneading discs without transport capacity are arranged upstream from the center and downstream from the center, respectively.
押出機にニーディングディスクが配置される場合、その数は特に制限されず、任意の数に設定できる。隣接するニーディングディスクの長軸がなす角度（ずらし角度）は特に制限されず、例えば、３０°～９０°の範囲から選択してもよい。ニーディングディスクの主面のアスペクト比（長軸の長さ／短軸の長さ）は特に制限されず、例えば、１．２～２．０の範囲から選択してもよい。 When kneading disks are arranged in the extruder, the number is not particularly limited and can be set to any number. The angle (shift angle) formed by the long axes of adjacent kneading disks is not particularly limited, and may be selected from the range of 30° to 90°, for example. The aspect ratio (long axis length/short axis length) of the main surface of the kneading disk is not particularly limited, and may be selected from the range of 1.2 to 2.0, for example.
本開示の方法は、樹脂と植物繊維とを含む混合物を、樹脂の投入を２回以上に分割して混練する工程を有するのであれば特に制限されず、その他の条件は一般的な混練方法に準じて設定できる。例えば、混練時のシリンダー温度は１５０℃～２５０℃の範囲から選択してもよい。 The method of the present disclosure is not particularly limited as long as it includes a step of kneading a mixture containing a resin and vegetable fibers by dividing the injection of resin into two or more times, and other conditions are set according to a general kneading method. It can be set accordingly. For example, the cylinder temperature during kneading may be selected from the range of 150°C to 250°C.
混合物に含まれる樹脂の種類は特に制限されない。例えば、ポリプロピレン、ポリエチレン等のポリオレフィン樹脂、ＡＢＳ（アクリロニトリル－ブタジエン－スチレン）樹脂、アクリル樹脂、ポリエステル樹脂、ポリウレタン樹脂、ポリスチレン樹脂、ポリアミド樹脂、ポリ塩化ビニル樹脂、ポリカーボネート樹脂等の熱可塑性樹脂、及びオレフィン系エラストマー、スチレン系エラストマー、ポリアミド系エラストマー、ポリエステル系エラストマー、ポリウレタン系エラストマー等の熱可塑性エラストマーが挙げられる。これらの中でもポリオレフィン樹脂が好ましい。
混合物に含まれる樹脂は、１種のみでも２種以上であってもよい。
The type of resin contained in the mixture is not particularly limited. For example, polyolefin resins such as polypropylene and polyethylene, thermoplastic resins such as ABS (acrylonitrile-butadiene-styrene) resins, acrylic resins, polyester resins, polyurethane resins, polystyrene resins, polyamide resins, polyvinyl chloride resins, and polycarbonate resins, and olefins. Examples of thermoplastic elastomers include thermoplastic elastomers, styrene-based elastomers, polyamide-based elastomers, polyester-based elastomers, and polyurethane-based elastomers. Among these, polyolefin resins are preferred.
The number of resins contained in the mixture may be one or two or more.
樹脂としては、官能基を有するものを用いてもよい。官能基としてはカルボキシ基、無水マレイン酸等の酸無水物基、エポキシ基などが挙げられる。官能基を有する樹脂を用いることで、樹脂と植物繊維との密着性が向上する効果が期待できる。
官能基を有する樹脂を用いる場合、その量は混合物に含まれる樹脂全体の１０質量％以下であることが好ましい。
As the resin, one having a functional group may be used. Examples of the functional group include a carboxy group, an acid anhydride group such as maleic anhydride, and an epoxy group. By using a resin having a functional group, the effect of improving the adhesion between the resin and the plant fibers can be expected.
When using a resin having a functional group, the amount thereof is preferably 10% by mass or less of the total resin contained in the mixture.
植物繊維としては、セルロース繊維が挙げられる。セルロース繊維の寸法は特に制限されない。例えば、平均繊維長を１μｍ～１００μｍの範囲から選択してもよく、平均繊維径を１μｍ～５０μｍの範囲から選択してもよい。
混合物に含まれる植物繊維は、１種のみでも２種以上であってもよい。
Examples of plant fibers include cellulose fibers. The dimensions of the cellulose fibers are not particularly limited. For example, the average fiber length may be selected from the range of 1 μm to 100 μm, and the average fiber diameter may be selected from the range of 1 μm to 50 μm.
The number of plant fibers contained in the mixture may be one or two or more.
混合物に含まれる樹脂及び植物繊維の含有率は特に制限されず、樹脂組成物の利用目的等に応じて設定できる。
混合物に含まれる樹脂の含有率は、混合物全体の３０質量％～９９質量％の範囲から選択してもよく、５５質量％～９５質量％の範囲から選択してもよい。
混合物に含まれる植物繊維の含有率は、混合物全体の１質量％～７０質量％の範囲から選択してもよく、５質量％～４５質量％の範囲から選択してもよい。
The contents of the resin and vegetable fibers contained in the mixture are not particularly limited, and can be set depending on the purpose of use of the resin composition.
The content of the resin contained in the mixture may be selected from the range of 30% by mass to 99% by mass of the entire mixture, or may be selected from the range of 55% by mass to 95% by mass.
The content of plant fibers contained in the mixture may be selected from the range of 1% to 70% by weight, or may be selected from the range of 5% to 45% by weight of the entire mixture.
必要に応じ、混合物は樹脂及び植物繊維以外の成分を含んでもよい。例えば、植物繊維強化樹脂組成物の添加剤として一般的に用いられる成分を含んでもよい。
上述したように、本開示の方法で製造される樹脂組成物は、添加剤を用いる以外の方法で力学的物性が改善される。このため、例えば、樹脂組成物の何らかの物性を低下させるおそれのある成分であっても、従来の樹脂組成物に比べて使用量を増やしたり、従来の樹脂組成物には使用に適しない成分を使用することが可能になる。
混合物が樹脂及び植物繊維以外の成分を含む場合、その含有率は混合物全体の１０質量％以下であってもよい。
If necessary, the mixture may contain components other than resin and vegetable fibers. For example, it may contain components commonly used as additives for plant fiber reinforced resin compositions.
As described above, the mechanical properties of the resin composition produced by the method of the present disclosure are improved by methods other than the use of additives. For this reason, for example, even if there is a risk of deteriorating some physical properties of the resin composition, the amount used may be increased compared to conventional resin compositions, or ingredients that are unsuitable for use in conventional resin compositions may be added. becomes possible to use.
When the mixture contains components other than resin and vegetable fibers, the content may be 10% by mass or less of the entire mixture.
以下、実施例に基づいて本発明を詳細に説明する。ただし、本発明はこれらの実施例に限定されるものではない。 Hereinafter, the present invention will be explained in detail based on Examples. However, the present invention is not limited to these examples.
＜樹脂組成物の作製＞
図１に示すように、樹脂の投入口を上流側（位置１）と中央部付近（位置２）にそれぞれ配置した押出機を用いて実施例及び比較例の樹脂組成物を作製した。
押出機としては、株式会社日本製鋼所の二軸押出機（ＴＥＸ３０、Ｌ／Ｄ＝７７、Ｄ＝３０ｍｍ）を使用した。
<Preparation of resin composition>
As shown in FIG. 1, resin compositions of Examples and Comparative Examples were produced using an extruder in which the resin inlet was placed on the upstream side (position 1) and near the center (position 2).
As the extruder, a twin screw extruder (TEX30, L/D=77, D=30 mm) manufactured by Japan Steel Works, Ltd. was used.
上記押出機を用いて、ポリプロピレン（株式会社プライムポリマー、Ｊ１０８Ｍ）７１．７質量％、針葉樹パルプ繊維２５質量％、及び無水マレイン酸変性ポリプロピレン（Ａｄｄｉｖａｎｔ社、ポリボンド３２００）３．３質量％の組成となる樹脂組成物を作製した。 Using the above extruder, a composition of 71.7% by mass of polypropylene (Prime Polymer Co., Ltd., J108M), 25% by mass of softwood pulp fiber, and 3.3% by mass of maleic anhydride-modified polypropylene (Polybond 3200, manufactured by Addivant) was prepared. A resin composition was prepared.
実施例１では、押出機の位置１からポリプロピレンを１．０８５ｋｇ／ｈ、針葉樹パルプ繊維を１．２５ｋｇ／ｈ、無水マレイン酸変性ポリプロピレンを０．１６５ｋｇ／ｈの供給速度で投入し、位置２からポリプロピレンを２．５ｋｇ／ｈの供給速度で投入して、ペレット状の樹脂組成物を得た。位置１と位置２との間における混合物に含まれるパルプ繊維の含有率は、５０質量％であった。混練はシリンダー温度１７０℃、スクリュー回転数１３６ｒｐｍの条件で行い、位置２からのポリプロピレンの投入は１７０℃に設定した単軸押出機を通して行った。 In Example 1, polypropylene was fed from position 1 of the extruder at a feed rate of 1.085 kg/h, softwood pulp fiber was fed at a feed rate of 1.25 kg/h, and maleic anhydride-modified polypropylene was fed at a feed rate of 0.165 kg/h, and from position 2. Polypropylene was fed at a feed rate of 2.5 kg/h to obtain a pelletized resin composition. The content of pulp fibers contained in the mixture between position 1 and position 2 was 50% by mass. The kneading was carried out under the conditions of a cylinder temperature of 170°C and a screw rotation speed of 136 rpm, and the polypropylene was introduced from position 2 through a single screw extruder set at 170°C.
比較例１では、押出機の位置１からポリプロピレンを３．５８５ｋｇ／ｈの供給速度で投入したことと、位置２からのポリプロピレンの投入を行わなかったこと以外は実施例１と同様にして、ペレット状の樹脂組成物を得た。 In Comparative Example 1, pellets were produced in the same manner as in Example 1, except that polypropylene was fed from position 1 of the extruder at a feeding rate of 3.585 kg/h, and polypropylene was not fed from position 2. A resin composition was obtained.
比較例２では、押出機の位置１からポリプロピレンを３．５８５ｋｇ／ｈの供給速度で投入したことと、位置２からのポリプロピレンの投入を行わなかったこと以外は実施例１と同様にして、ペレット状の樹脂組成物を得た。その後、得られた樹脂組成物を位置１から５ｋｇ／ｈの供給速度で投入して混練する工程をさらに２回実施した。 In Comparative Example 2, pellets were produced in the same manner as in Example 1, except that polypropylene was fed from position 1 of the extruder at a feeding rate of 3.585 kg/h, and polypropylene was not fed from position 2. A resin composition was obtained. Thereafter, the step of introducing and kneading the obtained resin composition from position 1 at a feeding rate of 5 kg/h was performed two more times.
＜力学的物性の評価＞
得られた樹脂組成物から、射出成型機を用いてＪＩＳ １Ａ型多目的試験片を作製し、万能型試験機（インストロン社、モデル５５６６）を用いて変位速度２ｍｍ／ｍｉｎ、支点間距離６４ｍｍの条件で曲げ試験を行い、曲げ弾性率及び曲げ強度を測定した。結果を表１に示す。
<Evaluation of mechanical properties>
A JIS 1A type multipurpose test piece was prepared from the obtained resin composition using an injection molding machine, and a multipurpose test piece of JIS 1A type was prepared using a universal testing machine (Instron, model 5566) at a displacement rate of 2 mm/min and a distance between fulcrums of 64 mm. A bending test was conducted under the following conditions, and the bending elastic modulus and bending strength were measured. The results are shown in Table 1.
表１に示すように、樹脂の投入を分割して行った実施例１の樹脂組成物は、樹脂の投入を一括して行った比較例１の樹脂組成物に比べて曲げ弾性率及び曲げ強度に優れていた。また、混練工程を３回実施した比較例２の樹脂組成物と比べて同等の曲げ弾性率及び曲げ強度を有していた。 As shown in Table 1, the resin composition of Example 1, in which the resin was added in parts, had a higher flexural modulus and bending strength than the resin composition in Comparative Example 1, in which the resin was added all at once. It was excellent. Moreover, it had the same bending elastic modulus and bending strength as the resin composition of Comparative Example 2, which was subjected to the kneading process three times.
Claims (8)
前記混練する工程は、樹脂と植物繊維とを混合してなる混合物を混練する工程と、前記混合物に樹脂を混合してなる混合物を混練する工程と、を連続して実施することを含み、
前記少なくとも２つの投入口のうち、最も上流側の投入口と最も下流側の投入口との間における前記混合物に含まれる前記植物繊維の含有率が３０質量％以上である、
植物繊維強化樹脂組成物の製造方法。 A step of kneading a mixture containing a resin and a vegetable fiber using an extruder, the resin being introduced into the extruder from at least two input ports,
The kneading step includes successively performing a step of kneading a mixture formed by mixing a resin and a vegetable fiber, and a step of kneading a mixture formed by mixing a resin with the mixture,
Of the at least two input ports, the content of the vegetable fibers contained in the mixture between the most upstream input port and the most downstream input port is 30% by mass or more.
A method for producing a plant fiber reinforced resin composition.
The method for producing a plant fiber reinforced resin composition according to any one of claims 1 to 7 , wherein the extruder has a screw length L/screw diameter D (L/D) of 36 or more.
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| JP2001288342A (en) | 2000-04-04 | 2001-10-16 | Sumitomo Chem Co Ltd | Liquid crystal polyester resin composition, method for producing the same and its molded product |
| JP2006510505A (en) | 2002-12-20 | 2006-03-30 | メカニケ・モデルネ・ソチエタ・ペル・アチオニ | Method for producing a composite material such as a mineral and / or vegetable filled thermoplastic resin |
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