JP2004203982A - Inorganic filler-containing resin composition - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は無機フィラー含有樹脂組成物に関するものである。
【０００２】
【従来の技術】
従来から種々の電気製品におけるケース等の材料として、熱可塑性樹脂に無機フィラーを混入した無機フィラー含有樹脂組成物が提供されている。このものは塩化ビニル樹脂、ＡＢＳ樹脂、ポリオレフィン樹脂のような熱可塑性樹脂に炭酸カルシウムやタルク等の無機フィラーを混入することで、熱膨張及び熱収縮を抑え、且つコストの低廉化を図っている（例えば特許文献１）。
【０００３】
また上記無機フィラー含有樹脂組成物とは別に熱可塑性樹脂に木粉を混入した木粉樹脂組成物も知られている。この木粉樹脂組成物は上記無機フィラー含有樹脂組成物に用いられる熱可塑性樹脂と同様の樹脂に木粉を５０質量％程度配合して調製されるものであって、このように木粉を高充填した木粉樹脂組成物を用いることで、木質感の表現、製材くずなどの木材資源の有効利用といった環境配慮、コストの低廉化、切削や釘打ちの容易さなどを実現している（例えば特許文献２）。
【０００４】
【特許文献１】
特開平９−６７２５２０号公報
【特許文献２】
特開２０００−３０３６７２号公報
【０００５】
【発明が解決しようとする課題】
ところで上記特許文献１に示す無機フィラー含有樹脂組成物は無機フィラーを添加することで、樹脂単体よりも熱膨張係数を幾分低下させることができるのだが、無機フィラーを４０質量％以上添加した場合、混練時の分散性及び成形性が低下してしまい、成形品が脆くなってしまったり、強度が低下してしまう。このため従来では無機フィラー樹脂組成物全量に対して４０質量％以上の多量の無機フィラーを配合することができなかった。そしてこのように４０質量％以上の無機フィラーを配合することができないことから、成形品の熱膨張量及び熱収縮量をわずかしか抑えることができず、このような成形品は高寸法精度が必要な箇所や、熱の影響を受ける箇所に用いられる建材として利用することができず、またコストの低廉化にも限界があった。
【０００６】
また特許文献２に示す木粉樹脂組成物から得られた成形品も木粉樹脂で固めたものであるにも関わらず、熱や水の影響を受け易い箇所に用いられる建材としては利用されていない。これは、樹脂と木粉とを混合することによって樹脂と木粉の双方の性質を併せ持つこととなり、熱による膨張・収縮が木材よりも大きく、且つ吸湿による膨張・収縮が樹脂よりも大きくなってしまい、高い寸法精度が得られないためである。
【０００７】
本発明は上記の点に鑑みてなされたものであり、その目的とするところは、混練時の分散性及び成形性を向上させることができ、これにより４０質量％以上の無機フィラーの配合を可能とし、そして４０質量％以上の無機フィラーを添加することで、成形品の膨張量・収縮量を大幅に抑え、従来にない高い寸法精度が得られ、コストの低廉化を実現できる無機フィラー含有樹脂組成物を提供することを課題とするものである。
【０００８】
【課題を解決するための手段】
上記課題を解決するために本発明に係る無機フィラー含有樹脂組成物は、熱可塑性樹脂と、組成物全量に対して４０質量％以上の無機フィラーとを含有する樹脂組成物において、木粉を混入することを特徴とするものである。
【０００９】
このように木粉を混入することで、組成物全量に対して４０質量％以上の無機フィラーを配合したにも関わらず、４０質量％未満の無機フィラーを配合した無機フィラー含有樹脂組成物と同様に混練時の分散性及び成形性を確保でき、且つこのように４０質量％以上の無機フィラーの配合を可能としたことで、得られた成形品の膨張量・収縮量を大幅に抑えることができ、従来にない高い寸法精度を得ることができる。
【００１０】
また請求項２記載の無機フィラー含有樹脂組成物は請求項１記載の無機フィラー含有樹脂組成物において、上記無機フィラーがアスペクト比１０以上の鱗片状であることを特徴とするものである。
【００１１】
無機フィラーとしてアスペクト比１０以上の鱗片状であるものを用いることで、その成形品に高寸法精度、低膨張・低収縮といった性能を与えることができる。
【００１２】
また請求項３記載の樹脂組成物は請求項１又は請求項２記載の無機フィラー含有樹脂組成物において、上記無機フィラーが、マイカ、タルク、アルミナのうち１種類、あるいは二種類以上の混合物であることを特徴とするものである。
【００１３】
無機フィラーとして、マイカ、タルク、アルミナのうち１種類、あるいは二種類以上の混合物を用いることで、より一層その成形品に高寸法精度、低膨張・低収縮といった性能を与えることができる。
【００１４】
また請求項４記載の無機フィラー含有樹脂組成物は請求項１〜３のいずれかに記載の無機フィラー含有樹脂組成物において、上記木粉が１０〜１５０メッシュの平均粒径であることを特徴とするものである。
【００１５】
木粉として１０〜１５０メッシュの平均粒径であるものを用いることで、より一層混練時の分散性及び成形性を向上することができる。
【００１６】
また請求項５記載の樹脂組成物は請求項１〜４のいずれかに記載の無機フィラー含有樹脂組成物において、上記熱可塑性樹脂がオレフィン系樹脂であることを特徴とするものである。
【００１７】
熱可塑性樹脂がオレフィン系樹脂であるので、環境面に好ましい。
【００１８】
また請求項６記載の無機フィラー含有樹脂組成物は請求項１〜５のいずれかに記載の無機フィラー含有樹脂組成物において、マレイン酸変性オレフィン樹脂を含有して成ることを特徴とするものである。
【００１９】
マレイン酸変性オレフィン樹脂を含有することで、相溶化を高め、フィラーの分散性、成形性をより一層向上できる。
【００２０】
【発明の実施の形態】
以下、本発明について説明する。
【００２１】
本発明における無機フィラー含有樹脂組成物は、熱可塑性樹脂と、無機フィラーと、木粉とを含有するものであり、無機フィラーは組成物全量に対して４０質量％以上配合されるものである。
【００２２】
まず、熱可塑性樹脂及び無機フィラーについて説明する。
【００２３】
熱可塑性樹脂としては環境面よりオレフィン系樹脂を用いることが好ましく、なかでも性能やコストの面でポリプロピレン、ポリエチレンが良い。上記ポリプロピレン及びポリエチレンは一方を単独で用いても良いし、また両者を併用しても良い。なお、熱可塑性樹脂としては上記のものに限定されるものではない。
【００２４】
また無機フィラーとしては特に限定されるものではないが、アスペクト比が１０以上の鱗片状の無機物が好ましく、種類としてはマイカ、アルミナ、タルクが好ましい。この場合、マイカ、タルク、アルミナのうち、１種を単独で用いても良いし、二種以上の混合物を用いても良い。
【００２５】
このような無機フィラーを配合することによって、その成形品に高寸法精度、低膨張・低収縮といった性能を与えることができる。またアスペクト比を１０以上としたのは、アスペクト比が大きい程より良好な性能を得ることができるからである。なお、上記したアスペクト比とは鱗片状粒子の直径を厚みで除した値であり、また粒度分布のあるものは重量平均直径を平均厚みを用いて算出した値とする。
【００２６】
ところで、上記熱可塑性樹脂と無機フィラーは例えば混練・押出しをすることで成形が行われるのだが、上記のように組成物全量に対して４０質量％以上の多量の無機フィラーを添加した場合、分散性が低下してしまい、これにより熱可塑性樹脂と無機フィラーとの混練が困難となり、また押出し工程における成形性も悪くなってしまう。更にこのように組成物全量に対して４０質量％以上の多量の無機フィラーを添加した無機フィラー含有樹脂組成物は分散性及び成形性が不十分であるので、成形品が脆くなって割れや欠けが起こってしまったり、強度が低下する等、物性面へ影響が出てしまう。
【００２７】
そこで本発明においては、熱可塑性樹脂と、組成物全量に対して４０質量％以上の無機フィラーとを含有する無機フィラー含有樹脂組成物において、木粉を混入することで上記問題点を解決している。すなわち木粉を添加することで、混練時の分散性及び成形性を向上させることができ、延いては前述した物性を向上させることが可能となるのである。これは例えば２軸の混練機等で混練する場合、無機物量が大きくなると時間当たりに混練される材料の材積が小さくなるために混練が不十分になると考えられ、木粉を添加することで見かけの材積が増大することにより分散性が向上するからと考えられる。更に言うと上記のように木粉を添加することで、成形品に木粉（木質材料）のねばりが付与され、これによってより一層物性を向上させることができる。
【００２８】
木粉としては例えば製材工場より排出されるおがくずや、廃木材、合板、ＭＤＦ、パーチクルボード等のサンダー粉等を用いることができる。また分散性、成形性をより向上させるには、木粉として、その平均粒径が１０〜１５０メッシュのものを用い、５〜３０質量％添加配合することが好ましい。すなわち、熱可塑性樹脂と、組成物全量に対して４０質量％以上の無機フィラーとを含有する無機フィラー含有樹脂組成物において、１０〜１５０メッシュの平均粒径を有し且つ組成物全量に対して５〜３０質量％の木粉を混入するのである。なお、上記木粉の平均粒径及び配合量は限定されるものではない。
【００２９】
また、上記の無機フィラー含有樹脂組成物に相溶化剤としての酸変性のオレフィン樹脂、具体的にはマレイン酸変性オレフィン樹脂を添加配合することが好ましい。相溶化を高めることによりフィラーの分散性、成形性をより一層向上でき、強度を確保できるからである。なおこの場合、酸変性をマレイン酸変性としたのは、効果、入手等の観点で優れているからである。更に言うと、より一層相溶化を高めるためには、使用している熱可塑性樹脂と同種の樹脂の酸変性物を添加することが好ましい。すなわち熱可塑性樹脂としてポリプロピレンを用いた場合には相溶化剤としてマレイン酸変性ポリプロピレンを用いるのである。そして上記マレイン酸変性オレフィン樹脂の添加量としては組成物全量に対して１〜１０質量％が好ましい。１質量％未満であるとその効果を十分に得られず、また１０質量％を越えると逆に強度が低下し、コスト的にも高価なものとなってしまうからである。なお、相溶化剤としては上記のものに限定されるものではなく、また添加量も限定されない。
【００３０】
上記無機フィラー含有樹脂組成物を調製する方法は特に限定されず、例えば通常の混練機や、混練と押出しとを同時に行う装置によって行う方法、あるいは剪断発熱により樹脂とフィラーとを一体化する方法等が適用できる。この場合、生産性を向上させるには上記製法の中でも特に混練と押出しとを同時に行う製法が好ましく、また特に混練を十分に行うには２軸の混練・押出機を用いることが好ましい。ここで樹脂と、無機フィラーと、木粉とを混練して無機フィラー含有樹脂組成物を調製する際に加熱・脱気を行うと、樹脂や無機フィラーや木粉に含有される揮発性有機化合物（ＶＯＣ）を除去することができ、これによって得られた成形品の揮発性有機化合物量を厚生労働省の指針値以下にすることが可能となる。これは特にリサイクル材料としての木粉や、樹脂、無機フィラーを含んだ無機フィラー含有樹脂組成物によって成形品を成形する場合には非常に有効である。上記加熱・脱気を行う条件の一例を挙げると、例えば熱可塑性樹脂としてポリプロピレンを用いた場合、加熱１８０〜２１０℃、脱気０．１Ｐａ以下の条件に設定して２〜３分間加熱・脱気を行う。
【００３１】
このように熱可塑性樹脂と、組成物全量に対して４０質量％以上の無機フィラーとを含有する無機フィラー含有樹脂組成物において、木粉を混入することで、組成物全量に対して４０質量％以上の無機フィラーを配合したにも関わらず、４０質量％未満の無機フィラーを配合した無機フィラー含有樹脂組成物と同様に混練時の分散性及び成形性を確保でき、これによって成形品の物性も低下することがなく、且つこのように４０質量％以上の無機フィラーの配合を可能としたことで、得られた成形品の膨張量・収縮量を大幅に抑えることができ、従来にない高い寸法精度を得ることができ、またコストをより一層低廉化できる。
【００３２】
以下本発明の実施例を具体的に説明する。
【００３３】
（実施例１）
ポリプロピレン３７質量％、マレイン酸変性ポリプロピレン３質量％に無機フィラーとしてアスペクト比９０のマイカを５０質量％添加したものに、４５メッシュの木粉を１０質量％添加して２軸混練押出機にて１．３ｍｍの成形板を成形した。混練は各材料を同時に別々に２軸混練押出機に供給して混練と押出しを同時に実施した。
【００３４】
（実施例２）
ポリプロピレン３２質量％、マレイン酸変性ポリプロピレン３質量％に無機フィラーとしてアスペクト比８０のマイカを５５質量％添加したものに、４５メッシュの木粉を１０質量％添加して２軸混練押出機にて１．３ｍｍの成形板を成形した。作成方法は実施例１と同様に実施した。
【００３５】
（比較例１）
ポリプロピレン４７質量％、マレイン酸変性ポリプロピレン３質量％に無機フィラーとしてアスペクト比８０のマイカを５０質量％添加したものを実施例１、２と同様に作成しようとしたが混練、成形が困難であるため、別途バンバリミキサーに全原料を入れて予備混練し、混練物を粉砕して、２軸混練押出機に投入して混練・成形して１．３ｍｍの成形板を成形した。
【００３６】
そして上記実施例１、２及び比較例１において得られた成形板の曲げ強度と熱膨張係数を測定した。なお曲げ強度はＪＩＳ Ａ ７２０３に準じてスパン２４ｍｍにてヘッドスピード１ｍｍ／ｍｉｎ、サンプルサイズ 幅２５ｍｍ×長さ１００ｍｍ×厚み１．３ｍｍで実施した。また熱膨張係数は成形板表面に歪みゲージを貼り、温度２０℃と８０℃の繰り返しを１０回行ってその歪み変化量の平均値を温度変化にて換算して熱膨張係数を求めた。
【００３７】
以下に結果を示す。
【００３８】
【表１】
【発明の効果】
上記のように本発明の請求項１記載の発明にあっては、木粉を混入することで、組成物全量に対して４０質量％以上の無機フィラーを配合したにも関わらず、４０質量％未満の無機フィラーを配合した無機フィラー含有樹脂組成物と同様に混練時の分散性及び成形性を確保でき、これによって成形品の物性も低下することがなく、且つこのように４０質量％以上の無機フィラーの配合を可能としたことで、得られた成形品の膨張量・収縮量を大幅に抑えることができ、従来にない高い寸法精度を得ることができ、またコストをより一層低廉化できる。
【００４０】
また請求項２記載の発明にあっては、上記請求項１記載の発明の効果に加えて、アスペクト比１０以上の鱗片状である無機フィラーを用いることで、その成形品に高寸法精度、低膨張・低収縮といった性能を与えることができる。
【００４１】
また請求項３記載の発明にあっては、上記請求項１又は請求項２記載の発明の効果に加えて、その成形品に高寸法精度、低膨張・低収縮といった性能を与えることができる。
【００４２】
また請求項４記載の発明にあっては、上記請求項１〜３のいずれかに記載の発明の効果に加えて、木粉として１０〜１５０メッシュの平均粒径であるものを用いることで、より一層混練時の分散性及び成形性を向上することができる。
【００４３】
また請求項５記載の発明にあっては、上記請求項１〜４のいずれかに記載の発明の効果に加えて、熱可塑性樹脂がオレフィン系樹脂であるので、環境面において優れたものとなる。
【００４４】
また請求項６記載の発明にあっては、上記請求項１〜４のいずれかに記載の発明の効果に加えて、マレイン酸変性オレフィン樹脂を含有することで、相溶化を高め、フィラーの分散性、成形性をより一層向上できる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inorganic filler-containing resin composition.
[0002]
[Prior art]
BACKGROUND ART As materials for cases and the like of various electric products, there have been provided inorganic filler-containing resin compositions in which an inorganic filler is mixed into a thermoplastic resin. This is intended to reduce thermal expansion and thermal shrinkage and reduce cost by mixing inorganic fillers such as calcium carbonate and talc into thermoplastic resins such as vinyl chloride resin, ABS resin and polyolefin resin. (For example, Patent Document 1).
[0003]
In addition to the inorganic filler-containing resin composition, a wood powder resin composition in which wood powder is mixed into a thermoplastic resin is also known. This wood flour resin composition is prepared by blending wood flour with a resin similar to the thermoplastic resin used for the above-mentioned inorganic filler-containing resin composition in an amount of about 50% by mass. By using the filled wood flour resin composition, expression of wood texture, environmental consideration such as effective use of wood resources such as sawdust, cost reduction, ease of cutting and nailing, etc. are realized (for example, Patent Document 2).
[0004]
[Patent Document 1]
JP-A-9-672520 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-303672
[Problems to be solved by the invention]
By the way, the inorganic filler-containing resin composition disclosed in Patent Document 1 described above can reduce the thermal expansion coefficient to some extent by adding an inorganic filler, but when the inorganic filler is added by 40% by mass or more. In addition, the dispersibility and moldability during kneading decrease, and the molded product becomes brittle or the strength decreases. For this reason, conventionally, it was not possible to mix a large amount of inorganic filler of 40% by mass or more with respect to the total amount of the inorganic filler resin composition. Since the inorganic filler of 40% by mass or more cannot be blended in this manner, the amount of thermal expansion and the amount of thermal shrinkage of the molded product can be suppressed only slightly, and such a molded product requires high dimensional accuracy. It cannot be used as a building material for a location that is affected by heat or a location that is affected by heat, and there is a limit in reducing the cost.
[0006]
In addition, although a molded product obtained from the wood powder resin composition disclosed in Patent Document 2 is also hardened with wood powder resin, it is used as a building material used in a location susceptible to heat and water. Absent. This means that by mixing resin and wood flour, both the properties of resin and wood flour will be combined, and the expansion and shrinkage due to heat will be greater than wood, and the expansion and shrinkage due to moisture absorption will be greater than resin. This is because high dimensional accuracy cannot be obtained.
[0007]
The present invention has been made in view of the above points, and its object is to improve the dispersibility and moldability during kneading, thereby allowing the incorporation of 40% by mass or more of an inorganic filler. And by adding 40% by mass or more of an inorganic filler, the amount of expansion and shrinkage of the molded article can be greatly suppressed, an unprecedented high dimensional accuracy can be obtained, and an inorganic filler-containing resin can be realized at low cost. It is an object to provide a composition.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an inorganic filler-containing resin composition according to the present invention is obtained by mixing wood powder in a resin composition containing a thermoplastic resin and 40% by mass or more of an inorganic filler based on the total amount of the composition. It is characterized by doing.
[0009]
By mixing wood flour in this manner, the same as the inorganic filler-containing resin composition in which less than 40% by mass of the inorganic filler is blended in spite of blending 40% by mass or more of the inorganic filler with respect to the total amount of the composition. By ensuring the dispersibility and moldability at the time of kneading, and by allowing the incorporation of 40% by mass or more of an inorganic filler in this way, the amount of expansion and shrinkage of the obtained molded product can be significantly suppressed. It is possible to obtain high dimensional accuracy which has not been achieved in the past.
[0010]
In addition, the inorganic filler-containing resin composition according to claim 2 is characterized in that, in the inorganic filler-containing resin composition according to claim 1, the inorganic filler has a scale-like shape having an aspect ratio of 10 or more.
[0011]
By using a scaly material having an aspect ratio of 10 or more as the inorganic filler, it is possible to provide the molded article with performance such as high dimensional accuracy, low expansion and low shrinkage.
[0012]
The resin composition according to claim 3 is the inorganic filler-containing resin composition according to claim 1 or 2, wherein the inorganic filler is one of mica, talc, and alumina, or a mixture of two or more thereof. It is characterized by the following.
[0013]
By using one or a mixture of two or more of mica, talc, and alumina as the inorganic filler, the molded product can be given more performance such as high dimensional accuracy, low expansion and low shrinkage.
[0014]
The inorganic filler-containing resin composition according to claim 4 is the inorganic filler-containing resin composition according to any one of claims 1 to 3, wherein the wood powder has an average particle size of 10 to 150 mesh. Is what you do.
[0015]
By using a wood powder having an average particle size of 10 to 150 mesh, the dispersibility and moldability during kneading can be further improved.
[0016]
A resin composition according to a fifth aspect is the resin composition containing an inorganic filler according to any one of the first to fourth aspects, wherein the thermoplastic resin is an olefin-based resin.
[0017]
Since the thermoplastic resin is an olefin resin, it is environmentally preferable.
[0018]
Further, the inorganic filler-containing resin composition according to claim 6 is characterized in that it comprises a maleic acid-modified olefin resin in the inorganic filler-containing resin composition according to any one of claims 1 to 5. .
[0019]
By containing the maleic acid-modified olefin resin, compatibilization can be enhanced, and the dispersibility and moldability of the filler can be further improved.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described.
[0021]
The inorganic filler-containing resin composition of the present invention contains a thermoplastic resin, an inorganic filler, and wood flour, and the inorganic filler is compounded in an amount of 40% by mass or more based on the total amount of the composition.
[0022]
First, the thermoplastic resin and the inorganic filler will be described.
[0023]
As the thermoplastic resin, it is preferable to use an olefin-based resin from the viewpoint of the environment. Among them, polypropylene and polyethylene are preferable in terms of performance and cost. One of the above polypropylene and polyethylene may be used alone, or both may be used in combination. The thermoplastic resin is not limited to the above.
[0024]
The inorganic filler is not particularly limited, but a scaly inorganic substance having an aspect ratio of 10 or more is preferable, and mica, alumina, and talc are preferable as the type. In this case, one of mica, talc and alumina may be used alone, or a mixture of two or more thereof may be used.
[0025]
By blending such an inorganic filler, the molded product can be given performances such as high dimensional accuracy, low expansion and low shrinkage. The aspect ratio is set to 10 or more because better performance can be obtained as the aspect ratio increases. The above aspect ratio is a value obtained by dividing the diameter of the flaky particles by the thickness, and those having a particle size distribution are values calculated by using the average thickness of the weight average diameter.
[0026]
By the way, the thermoplastic resin and the inorganic filler are molded by, for example, kneading and extrusion. However, when a large amount of the inorganic filler of 40% by mass or more based on the total amount of the composition is added as described above, dispersion Therefore, the kneading of the thermoplastic resin and the inorganic filler becomes difficult, and the moldability in the extrusion step also deteriorates. Further, since the inorganic filler-containing resin composition to which a large amount of the inorganic filler of 40% by mass or more with respect to the total amount of the composition is added has insufficient dispersibility and moldability, the molded article becomes brittle and cracks or chipping occurs. , Or the strength is reduced, which affects the physical properties.
[0027]
Therefore, in the present invention, in the inorganic filler-containing resin composition containing a thermoplastic resin and an inorganic filler of 40% by mass or more based on the total amount of the composition, the above problem is solved by mixing wood powder. I have. That is, by adding the wood flour, the dispersibility and the moldability during kneading can be improved, and thus the above-mentioned physical properties can be improved. For example, when kneading with a biaxial kneader or the like, it is considered that if the amount of the inorganic substance is large, the volume of the material to be kneaded per hour becomes small, so that kneading becomes insufficient. It is considered that the dispersibility is improved by increasing the volume of the material. More specifically, by adding wood flour as described above, the stickiness of wood flour (woody material) is imparted to the molded product, whereby the physical properties can be further improved.
[0028]
As the wood powder, for example, sawdust discharged from a sawmill, waste wood, plywood, MDF, sander powder such as particle board, and the like can be used. In order to further improve the dispersibility and moldability, it is preferable to use wood powder having an average particle size of 10 to 150 mesh and to add and mix 5 to 30% by mass. That is, in an inorganic filler-containing resin composition containing a thermoplastic resin and 40% by mass or more of an inorganic filler based on the total amount of the composition, the resin composition has an average particle size of 10 to 150 mesh and is based on the total amount of the composition. 5 to 30% by mass of wood flour is mixed. The average particle size and the amount of the wood flour are not limited.
[0029]
Further, it is preferable to add and mix an acid-modified olefin resin as a compatibilizer, specifically, a maleic acid-modified olefin resin, to the above-mentioned inorganic filler-containing resin composition. By increasing the compatibilization, the dispersibility and moldability of the filler can be further improved, and the strength can be secured. In this case, the reason why the acid modification is maleic acid modification is that it is excellent in terms of effects, availability, and the like. In addition, in order to further enhance the compatibility, it is preferable to add an acid-modified resin of the same kind as the thermoplastic resin used. That is, when polypropylene is used as the thermoplastic resin, maleic acid-modified polypropylene is used as the compatibilizer. The addition amount of the maleic acid-modified olefin resin is preferably 1 to 10% by mass based on the total amount of the composition. If the amount is less than 1% by mass, the effect cannot be sufficiently obtained. If the amount exceeds 10% by mass, the strength is reduced, and the cost becomes high. The compatibilizer is not limited to the above, and the amount of the compatibilizer is not limited.
[0030]
The method of preparing the above-mentioned inorganic filler-containing resin composition is not particularly limited. For example, a method in which the resin and the filler are integrated by a conventional kneader or a device that simultaneously performs kneading and extrusion, or a method in which the resin and the filler are integrated by shearing heat generation, and the like. Can be applied. In this case, in order to improve the productivity, among the above-mentioned production methods, a production method in which kneading and extrusion are performed at the same time is preferable, and in order to perform kneading sufficiently, it is preferable to use a biaxial kneading / extruder. Here, the resin, the inorganic filler, and wood powder are kneaded and heated and degassed when preparing an inorganic filler-containing resin composition, and volatile organic compounds contained in the resin, the inorganic filler and the wood powder (VOC) can be removed, thereby making it possible to reduce the amount of volatile organic compounds in the obtained molded article to the guide value of the Ministry of Health, Labor and Welfare. This is very effective especially when a molded article is formed from wood powder as a recycled material, or an inorganic filler-containing resin composition containing a resin and an inorganic filler. As an example of the conditions for performing the above heating and degassing, for example, when polypropylene is used as the thermoplastic resin, heating and degassing are set at 180 to 210 ° C. and degassing of 0.1 Pa or less for 2 to 3 minutes. Do care.
[0031]
As described above, in the inorganic filler-containing resin composition containing the thermoplastic resin and the inorganic filler in an amount of 40% by mass or more based on the total amount of the composition, the wood flour is mixed, so that 40% by mass based on the total amount of the composition. Despite blending the above inorganic filler, dispersibility and moldability at the time of kneading can be ensured in the same manner as the inorganic filler-containing resin composition blended with less than 40% by mass of the inorganic filler. By allowing the addition of an inorganic filler of 40% by mass or more without lowering, the amount of expansion and shrinkage of the obtained molded product can be greatly suppressed, and a higher dimension than ever before Accuracy can be obtained and cost can be further reduced.
[0032]
Hereinafter, examples of the present invention will be specifically described.
[0033]
(Example 1)
To a mixture of 37% by mass of polypropylene and 3% by mass of maleic acid-modified polypropylene and 50% by mass of mica having an aspect ratio of 90 as an inorganic filler, 10% by mass of 45-mesh wood flour was added. A molded plate of 0.3 mm was formed. For kneading, the respective materials were simultaneously and separately supplied to a twin-screw kneading extruder, and kneading and extrusion were performed simultaneously.
[0034]
(Example 2)
To a mixture of 32% by mass of polypropylene and 3% by mass of maleic acid-modified polypropylene and 55% by mass of mica having an aspect ratio of 80 as an inorganic filler, 10% by mass of 45-mesh wood flour was added. A molded plate of 0.3 mm was formed. The preparation method was the same as in Example 1.
[0035]
(Comparative Example 1)
An attempt was made to produce a mixture obtained by adding 50% by mass of mica having an aspect ratio of 80 as an inorganic filler to 47% by mass of polypropylene and 3% by mass of maleic acid-modified polypropylene in the same manner as in Examples 1 and 2, but kneading and molding were difficult. Separately, all the raw materials were put into a Banbury mixer and preliminarily kneaded. The kneaded material was pulverized, and then put into a twin-screw kneading extruder to knead and mold to form a 1.3 mm molded plate.
[0036]
Then, the bending strength and the coefficient of thermal expansion of the molded plates obtained in Examples 1 and 2 and Comparative Example 1 were measured. The bending strength was measured according to JIS A 7203 at a span of 24 mm, a head speed of 1 mm / min, and a sample size of 25 mm width × 100 mm length × 1.3 mm thickness. The coefficient of thermal expansion was determined by attaching a strain gauge to the surface of the molded plate, repeating the temperature at 20 ° C. and 80 ° C. ten times, and converting the average value of the amount of change in strain into the change in temperature to obtain the coefficient of thermal expansion.
[0037]
The results are shown below.
[0038]
[Table 1]
【The invention's effect】
As described above, in the invention according to claim 1 of the present invention, by mixing wood flour, 40 mass% or more of the inorganic filler is blended with respect to the total amount of the composition. Dispersibility and moldability at the time of kneading can be ensured in the same manner as the inorganic filler-containing resin composition in which less than the inorganic filler is blended, whereby the physical properties of the molded article do not decrease, and thus, the content of 40% by mass or more is obtained. By allowing the addition of an inorganic filler, the amount of expansion and shrinkage of the obtained molded article can be greatly suppressed, a higher dimensional accuracy than before can be obtained, and the cost can be further reduced. .
[0040]
Further, in the invention of claim 2, in addition to the effects of the invention of claim 1, by using a flaky inorganic filler having an aspect ratio of 10 or more, high dimensional accuracy and low Performance such as expansion and low shrinkage can be provided.
[0041]
According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the molded article can be provided with high dimensional accuracy, low expansion and low shrinkage.
[0042]
In the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, by using wood powder having an average particle size of 10 to 150 mesh, The dispersibility and moldability during kneading can be further improved.
[0043]
In the invention according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 4, since the thermoplastic resin is an olefin resin, it is excellent in environmental aspects. .
[0044]
In the invention of claim 6, in addition to the effects of the invention of any one of claims 1 to 4, the addition of a maleic acid-modified olefin resin enhances compatibilization and disperses the filler. Properties and moldability can be further improved.
Claims (6)
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| JP2002373143A JP4001012B2 (en) | 2002-12-24 | 2002-12-24 | Inorganic filler-containing resin composition |
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| JP2002373143A JP4001012B2 (en) | 2002-12-24 | 2002-12-24 | Inorganic filler-containing resin composition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102329514A (en) * | 2011-08-15 | 2012-01-25 | 江苏福瑞森塑木科技有限公司 | High-strength plastic wood dalle and preparation method thereof |
| CN104405075A (en) * | 2014-11-11 | 2015-03-11 | 南京工业职业技术学院 | Composite wall sheet material and preparation method thereof |
| JP2020083951A (en) * | 2018-11-19 | 2020-06-04 | 共同印刷株式会社 | Manufacturing method of fine particle dispersion resin composition and fine particle dispersion resin composition |
| JP2020083952A (en) * | 2018-11-19 | 2020-06-04 | 共同印刷株式会社 | Manufacturing method of fine particle dispersion resin composition and fine particle dispersion resin composition |
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- 2002-12-24 JP JP2002373143A patent/JP4001012B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102329514A (en) * | 2011-08-15 | 2012-01-25 | 江苏福瑞森塑木科技有限公司 | High-strength plastic wood dalle and preparation method thereof |
| CN104405075A (en) * | 2014-11-11 | 2015-03-11 | 南京工业职业技术学院 | Composite wall sheet material and preparation method thereof |
| CN104405075B (en) * | 2014-11-11 | 2016-07-06 | 南京工业职业技术学院 | A kind of composite wall board and preparation method thereof |
| JP2020083951A (en) * | 2018-11-19 | 2020-06-04 | 共同印刷株式会社 | Manufacturing method of fine particle dispersion resin composition and fine particle dispersion resin composition |
| JP2020083952A (en) * | 2018-11-19 | 2020-06-04 | 共同印刷株式会社 | Manufacturing method of fine particle dispersion resin composition and fine particle dispersion resin composition |
| JP7190878B2 (en) | 2018-11-19 | 2022-12-16 | 共同印刷株式会社 | Method for producing fine particle-dispersed resin composition, and fine particle-dispersed resin composition |
| JP7190877B2 (en) | 2018-11-19 | 2022-12-16 | 共同印刷株式会社 | Method for producing fine particle-dispersed resin composition, and fine particle-dispersed resin composition |
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