JP2005162828A - Resin composition for profile extrusion molding, profile thin-gauge molded article and its molding method - Google Patents
Resin composition for profile extrusion molding, profile thin-gauge molded article and its molding method Download PDFInfo
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- 239000011342 resin composition Substances 0.000 title claims abstract description 71
- 238000001125 extrusion Methods 0.000 title claims abstract description 70
- 238000000465 moulding Methods 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 16
- 229920005989 resin Polymers 0.000 claims abstract description 62
- 239000011347 resin Substances 0.000 claims abstract description 62
- -1 polypropylene Polymers 0.000 claims abstract description 50
- 229920001155 polypropylene Polymers 0.000 claims abstract description 45
- 239000004743 Polypropylene Substances 0.000 claims abstract description 44
- 239000000155 melt Substances 0.000 claims abstract description 41
- 229920001038 ethylene copolymer Polymers 0.000 claims abstract description 38
- 239000000454 talc Substances 0.000 claims abstract description 34
- 229910052623 talc Inorganic materials 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 description 15
- 229920001903 high density polyethylene Polymers 0.000 description 8
- 239000004700 high-density polyethylene Substances 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 7
- 238000003856 thermoforming Methods 0.000 description 7
- 239000004711 α-olefin Substances 0.000 description 7
- 238000004898 kneading Methods 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 239000011256 inorganic filler Substances 0.000 description 4
- 229910003475 inorganic filler Inorganic materials 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920005672 polyolefin resin Polymers 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000012661 block copolymerization Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、異形押出成形用エチレン共重合体系樹脂組成物、及び該樹脂組成物を押出成形して得られた異形薄肉成形品とその成形法に関する。 The present invention relates to an ethylene copolymer-based resin composition for profile extrusion molding, a profile thin molded product obtained by extrusion molding of the resin composition, and a molding method thereof.
従来、ポリエチレン又はポリプロピレン系樹脂組成物から得られる異形成形品は、ポリエチレン又はポリプロピレン系樹脂組成物を押出成形して得たフィルム、シート又は板状成形物を加熱軟化させた後、更に熱成形、例えば真空成形または圧空成形などにより各種容器、カップ、トレー等の薄物容器、深絞容器等に成形されていた。
例えば、各種容器、カップ、トレー等を製造するための熱成形用ポリオレフィン系樹脂シートとして、メルトインデックス（ＭＩ）が０．１〜５．０ｇ／１０分のポリプロピレン系樹脂、ＭＩが０．０２〜１０．０ｇ／１０分の高密度ポリエチレン及びタルクからなる熱成形用の組成物が知られている（例えば特許文献１参照）。該樹脂組成物は、高密度ポリエチレンを用いることにより熱成形時の伸びの向上を図って、深物製品が得られるという特徴を有する。
Conventionally, a deformed product obtained from a polyethylene or polypropylene resin composition is heat-molded after heat-softening a film, sheet or plate-shaped product obtained by extrusion molding of a polyethylene or polypropylene resin composition, For example, it was formed into various containers, thin containers such as cups and trays, deep drawn containers, etc. by vacuum forming or pressure forming.
For example, as a polyolefin resin sheet for thermoforming for producing various containers, cups, trays and the like, a polypropylene resin having a melt index (MI) of 0.1 to 5.0 g / 10 min and an MI of 0.02 to A composition for thermoforming made of high-density polyethylene and talc of 10.0 g / 10 min is known (see, for example, Patent Document 1). The resin composition has a feature that a deep product can be obtained by using high-density polyethylene to improve elongation during thermoforming.
また、熱成形用ポリオレフィン系樹脂シートとして、ポリプロピレン、低密度ポリエチレン、高密度ポリエチレンとタルクとからなる樹脂組成物を溶融成形して得られるシートが知られている。従来のポリプロピレンシートに比べより薄肉化しても耐熱性、剛性を維持した上に熱成形性に優れ、ヒートシール性も良好であるという特徴を有する（例えば特許文献２参照）。 Further, as a polyolefin resin sheet for thermoforming, a sheet obtained by melt molding a resin composition comprising polypropylene, low density polyethylene, high density polyethylene and talc is known. Even if it is made thinner than a conventional polypropylene sheet, it maintains heat resistance and rigidity, is excellent in thermoformability, and has good heat sealability (see, for example, Patent Document 2).
更に、熱成形用シートとして、タルクを主成分とする無機充填剤、ポリプロピレン系樹脂、高密度ポリエチレン及びエチレン含有補助重合体からなる複合材料を押出成形したシートが開示されている。このシートを熱成形して得られる食品包装用容器は、良好な剛性と耐衝撃性のバランスを有しており、ワンウェイ流通の容器に好適に使用されることが開示されている（例えば特許文献３参照）。 Furthermore, as a sheet for thermoforming, a sheet obtained by extruding a composite material composed of an inorganic filler mainly composed of talc, a polypropylene resin, high-density polyethylene and an ethylene-containing auxiliary polymer is disclosed. It has been disclosed that a food packaging container obtained by thermoforming this sheet has a good balance between rigidity and impact resistance and is suitably used for a one-way distribution container (for example, Patent Documents). 3).
その他、異形押出成形用の樹脂組成物としては、ポリプロピレン、ポリテトラフルオロエチレンおよび無機フィラーからなる成形加工性を向上させた異形押出成形用の樹脂組成物（例えば、特許文献４参照）や、成形加工性が良く、金型ダイス口から押出された時の形状保持に優れたリグノセルロース系又はセルロース系物質を含有するポリオレフィン系樹脂組成物（例えば、特許文献５参照）が知られている。 In addition, as a resin composition for profile extrusion molding, a resin composition for profile extrusion molding with improved molding processability composed of polypropylene, polytetrafluoroethylene and an inorganic filler (for example, see Patent Document 4), molding A polyolefin-based resin composition containing a lignocellulosic or cellulosic material that has good processability and excellent shape retention when extruded from a die die is known (for example, see Patent Document 5).
しかし、例えば特許文献１では、ポリプロピレン系樹脂の欠点である、二次成形の際のドローダウンや、シワや偏肉となるのを防ぐために、高密度ポリエチレン、ポリプロピレン及びタルクからなる組成物を開示しているが、密度が０．９４０〜０．９７０ｇ／ｃｍ３程度の高密度ポリエチレンを異形押出成形用の樹脂組成物に使用すると、密度が高いこと及び冷却部位の不均一と冷却速度のばらつきによる成形収縮の差に起因する波打ち現象が生じやすくなり、異形押出成形する際に実用上支障を生ずる。
また、例えば特許文献２に開示されている樹脂組成物も高密度ポリエチレンが配合されているので、剛性は高くなるが、同様に波打ち現象が生じやすくなり、異形押出成形する際に実用上支障を生ずる。
However, for example, Patent Document 1 discloses a composition comprising high-density polyethylene, polypropylene, and talc in order to prevent drawdown, wrinkles, and uneven thickness during secondary molding, which is a drawback of polypropylene resins. However, when high-density polyethylene having a density of about 0.940 to 0.970 g / cm 3 is used for the resin composition for profile extrusion molding, the density is high, the cooling part is uneven, and the cooling rate varies. As a result, the corrugation phenomenon due to the difference in molding shrinkage due to the above becomes easy to occur, and this causes a practical problem when performing profile extrusion molding.
Further, for example, since the resin composition disclosed in Patent Document 2 is also blended with high-density polyethylene, the rigidity becomes high, but similarly, the undulation phenomenon is likely to occur, and there is a practical impediment when performing profile extrusion molding. Arise.
さらに、特許文献３に開示されているタルクを主成分とする無機充填剤、ポリプロピレン系樹脂、高密度ポリエチレン及びエチレン含有補助重合体からなる組成物は、組成物中のタルクの含有量が５０重量％以上と極端に多いため、強度が低下するという問題点がある。 尚、上記した特許文献４及び５に開示の異形押出用樹脂組成物は、それぞれポリテトラフルオロエチレン、リグノセルロース系又はセルロース系物質等のポリエチレン及びポリプロピレン以外のポリオレフィン等を含有している。 従って、ポリマーとしてポリエチレン系樹脂及びポリプロピレン系樹脂とタルクからなる樹脂組成物で、異形押出成形に適用した際に強度、剛性、表面外観性、及び成形加工性に優れ、かつドロ−ダウンや波打が少ないという特徴を有する樹脂組成物は知られておらず、その成形法も知られていない。 Furthermore, a composition comprising an inorganic filler mainly composed of talc, a polypropylene resin, high-density polyethylene and an ethylene-containing auxiliary polymer disclosed in Patent Document 3 has a talc content of 50% by weight in the composition. There is a problem that the strength decreases because it is extremely large, such as% or more. In addition, the resin composition for profile extrusion disclosed in Patent Documents 4 and 5 described above contains polyethylene such as polytetrafluoroethylene, lignocellulose-based or cellulose-based material, and polyolefin other than polypropylene, respectively. Therefore, it is a resin composition comprising a polyethylene resin and a polypropylene resin and talc as a polymer, and is excellent in strength, rigidity, surface appearance, and molding processability when applied to profile extrusion molding, and is drawn down and corrugated. There is no known resin composition having such a feature that there is little, and the molding method is not known.
本発明者らは鋭意検討した結果、成形加工性、及び剛性と柔軟性のバランスを確保するために、特定の密度とメルトフローレート値を有するエチレン共重合体に、特定のメルトフローレート値を有するポリプロピレン系樹脂を一定割合配合し、更に強度低下を最小限に抑えて表面外観性を維持するために、タルクを一定割合配合した樹脂組成物を、異形押出成形に使用すると、強度、剛性、表面外観性、及び成形加工性に優れ、かつドロ−ダウンや波打ちが大幅に改良されることを見出し、本発明を完成させた。 As a result of intensive studies, the present inventors have determined that a specific melt flow rate value is given to an ethylene copolymer having a specific density and a melt flow rate value in order to ensure a balance between moldability and rigidity and flexibility. In order to maintain a surface appearance by minimizing a decrease in strength and maintaining a surface appearance with a certain proportion of polypropylene-based resin having, a strength, rigidity, The present invention has been completed by finding that the surface appearance and molding processability are excellent and the drawdown and undulation are greatly improved.
すなわち、本発明は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）、及びタルクからなる樹脂組成物であって、エチレン共重合体（Ａ）６０〜９５重量％とポリプロピレン系樹脂（Ｂ）５〜４０重量％からなる樹脂混合物（Ｃ）１００重量部に対し、タルクを１〜４０重量部配合して得られる異形押出成形用樹脂組成物（Ｄ）に関する発明である。
本発明の異形押出成形用樹脂組成物（Ｄ）においては更に、
（１）エチレン共重合体（Ａ）の密度が０．８６０〜０．９１５ｇ／ｃｍ３の範囲であること、
（２）エチレン共重合体（Ａ）のメルトフローレート値が０．１〜２．０ｇ／１０分の範囲であること、
（３）ポリプロピレン系樹脂（Ｂ）のメルトフローレート値が０．５〜２．０ｇ／１０分の範囲であること、
（４）前記樹脂組成物中の樹脂混合物（Ｃ）がエチレン共重合体（Ａ）６０〜８０重量％とポリプロピレン系樹脂（Ｂ）２０〜４０重量％からなる樹脂混合物であること、
（５）前記樹脂組成物中のタルクの配合割合が樹脂混合物（Ｃ）１００重量部に対し、タルクが２０〜４０重量部であること、
（６）異形押出成形用樹脂組成物（Ｄ）のメルトフローレート値（ＡＳＴＭ Ｄ１２３８による１９０℃、２．１６ｋｇ荷重で測定したＭＦＲ）が０．１〜１０．０ｇ／１０分の範囲であることが望ましい。
That is, the present invention has a density in the range of 0.860 to 0.920 g / cm 3 and a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg is 0.1 to 10 g / An ethylene copolymer (A) in the range of 10 minutes, a polypropylene having a melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and a load of 2.16 kg of 0.2 to 3.0 g / 10 minutes Resin resin (B) and resin composition comprising talc, resin mixture (C) comprising ethylene copolymer (A) 60 to 95% by weight and polypropylene resin (B) 5 to 40% by weight 100% It is the invention regarding the resin composition for profile extrusion molding (D) obtained by mix | blending 1-40 weight part of talc with respect to a part.
In the resin composition for profile extrusion molding (D) of the present invention,
(1) The density of the ethylene copolymer (A) is in the range of 0.860 to 0.915 g / cm 3 ,
(2) The melt flow rate value of the ethylene copolymer (A) is in the range of 0.1 to 2.0 g / 10 minutes,
(3) The melt flow rate value of the polypropylene resin (B) is in the range of 0.5 to 2.0 g / 10 minutes,
(4) The resin mixture (C) in the resin composition is a resin mixture comprising 60 to 80% by weight of the ethylene copolymer (A) and 20 to 40% by weight of the polypropylene resin (B),
(5) The blending ratio of talc in the resin composition is 20 to 40 parts by weight of talc with respect to 100 parts by weight of the resin mixture (C).
(6) The melt flow rate value of the resin composition for profile extrusion molding (D) (MFR measured at 190 ° C. under 2.16 kg load according to ASTM D1238) is in the range of 0.1 to 10.0 g / 10 min. Is desirable.
また本発明は、前記異形押出成形用樹脂組成物（Ｄ）を押出成形して得られる、厚みが０．２〜２．０ｍｍの範囲であり、かつ成形品全体の厚みがほぼ均一であることを特徴とする異形薄肉成形品に関する発明である。
本発明の異形薄肉成形品においては、更に、
（１）異形薄肉成形品が少なくとも２つの薄肉面の接合部を有すること、
（２）異形薄肉成形品の押出方向と直交する方向の幅が３ｃｍ以上であること
が望ましい。
Further, in the present invention, the thickness obtained by extruding the profile extrusion molding resin composition (D) is in the range of 0.2 to 2.0 mm, and the thickness of the entire molded product is substantially uniform. It is invention regarding the unusual thin-walled molded product characterized by this.
In the modified thin-walled molded product of the present invention,
(1) The deformed thin-walled molded product has at least two thin-walled joints,
(2) It is desirable that the width in the direction orthogonal to the extrusion direction of the deformed thin molded product is 3 cm or more.
更に、本発明は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）６０〜９５重量％と、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）５〜４０重量％からなる樹脂混合物（Ｃ）１００重量部に対しタルクを１〜４０重量部配合して得られる樹脂組成物を使用して、厚みが０．２〜２．０ｍｍで、且つ成形品全体の厚みがほぼ均一の異形薄肉成形品を押出成形する際に、該樹脂組成物の溶融粘度が１０３〜１０６（Ｐa・s）となる条件下で異形押出成形後、直ちに急冷することを特徴とする異形薄肉成形品の成形法に関する発明である。
本発明の異形薄肉成形品の成形法においては更に、
（１）前記樹脂組成物のメルトフローレート値（ＡＳＴＭ Ｄ１２３８による２００℃、２．１６ｋｇ荷重で測定したＭＦＲ）が０．１〜１０．０ｇ／１０分の範囲であること、
（２）急冷が水による直接冷却であること、
（３）異形薄肉成形品が少なくとも２つの薄肉面の接合部を有すること、
（４）異形薄肉成形品が３ｃｍ以上の押出方向と直交する方向の幅を有することが望ましい。
Furthermore, the present invention has a density in the range of 0.860 to 0.920 g / cm 3 and a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg of 0.1 to 10 g / 60-95% by weight of ethylene copolymer (A) in the range of 10 minutes and a melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and 2.16 kg load is 0.2-3.0 g / 10 Using a resin composition obtained by blending 1 to 40 parts by weight of talc with respect to 100 parts by weight of a resin mixture (C) consisting of 5 to 40% by weight of a polypropylene resin (B) in a range of minutes, the thickness is When extruding an irregularly thin molded product having a thickness of 0.2 to 2.0 mm and a substantially uniform thickness, the resin composition has a melt viscosity of 10 3 to 10 6 (Pa · s). Under conditions After the shape extrusion molding, an invention relating to molding of profiled thin-wall molded article, characterized by rapidly cooling.
In the molding method of the thin profile molded product of the present invention,
(1) The melt flow rate value (200 ° C., MFR measured at 2.16 kg load according to ASTM D1238) of the resin composition is in the range of 0.1 to 10.0 g / 10 min.
(2) The rapid cooling is direct cooling with water,
(3) The deformed thin-walled molded product has at least two thin-walled joints,
(4) It is desirable that the modified thin-walled molded product has a width in a direction orthogonal to the extrusion direction of 3 cm or more.
本発明の異形押出成形用樹脂組成物（Ｄ）は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）、及びタルクからなる樹脂組成物であって、エチレン共重合体（Ａ）６０〜９５重量％とポリプロピレン系樹脂（Ｂ）５〜４０重量％からなる樹脂混合物（Ｃ）１００重量部に対し、タルクを１〜４０重量部配合して得られることを特徴とする。 これまで熱可塑性樹脂にフィラーを配合してなる異形押出成形用の樹脂組成物で、特に強度、剛性、表面外観性、及び成形加工性に優れ、かつドローダウンや波打ちの極めて少ない薄肉の異形押出成形品を製造するための樹脂組成物は知られておらず、その応用分野は大きく制限されていた。 The resin composition for profile extrusion molding (D) of the present invention has a density in the range of 0.860 to 0.920 g / cm 3 and a melt flow rate value measured according to ASTM D1238 at 190 ° C. and a load of 2.16 kg. An ethylene copolymer (A) having a MFR) in the range of 0.1 to 10 g / 10 min, a melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and a load of 2.16 kg is 0.2 to 3. A resin composition comprising a polypropylene resin (B) in the range of 0 g / 10 min, and talc, comprising an ethylene copolymer (A) 60 to 95% by weight and a polypropylene resin (B) 5 to 40% by weight It is obtained by blending 1 to 40 parts by weight of talc with respect to 100 parts by weight of the resin mixture (C). Up to now, it is a resin composition for profile extrusion molding in which a filler is blended with a thermoplastic resin, and it is particularly excellent in strength, rigidity, surface appearance and molding processability, and has a thin profile extrusion with extremely little drawdown and undulation. A resin composition for producing a molded article is not known, and its application field has been greatly limited.
しかし、上記異形押出成形用樹脂組成物（Ｄ）を使用することにより、異形押出成形の際に樹脂の固化時と溶融時の比容積の差が大きいときに生じ易い波打ち現象を有効に抑制する対策の１つとなり、また、成形品の曲げ弾性率が低いと剛性が低いという問題、更にドローダウンの問題解決が可能となる。 また、上記エチレン共重合体（Ａ）に、ポリプロピレン系樹脂（Ｂ）とタルクを適当量配合することにより、表面外観性の向上を図れ、かつ強度の低下を抑制することが可能となる。 However, by using the profile extrusion molding resin composition (D), it is possible to effectively suppress the undulation phenomenon that is likely to occur when the difference in specific volume between the resin solidification and the melt is large during profile extrusion. This is one of the measures, and if the flexural modulus of the molded product is low, the problem that the rigidity is low and the problem of drawdown can be solved. Further, by blending an appropriate amount of the polypropylene resin (B) and talc into the ethylene copolymer (A), it is possible to improve the surface appearance and to suppress a decrease in strength.
また、本発明の異形薄肉成形品の成形法は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）６０〜９５重量％と、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ
Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）５〜４０重量％からなる樹脂混合物（Ｃ）１００重量部に対しタルクを１〜４０重量部配合して得られる樹脂組成物を、押出成形する際の溶融樹脂の粘度が１０３〜１０６（Ｐa・s）となる条件下で異形押出成形後、急冷して得られる、成形品の厚みが０．２〜２．０ｍｍの範囲にあり、且つ全体の厚みがほぼ均一であることを特徴とする。
In addition, the molding method of the deformed thin-walled molded article of the present invention has a density in the range of 0.860 to 0.920 g / cm 3 and a melt flow rate value measured at 190 ° C. and a load of 2.16 kg (MFR according to ASTM D1238). ) Of ethylene copolymer (A) in the range of 0.1 to 10 g / 10 min, and melt flow rate value (ASTM) measured at 230 ° C. and 2.16 kg load
1 to 40 parts by weight of talc is added to 100 parts by weight of a resin mixture (C) consisting of 5 to 40% by weight of a polypropylene resin (B) having an MFR of D1238 in the range of 0.2 to 3.0 g / 10 min. The thickness of the molded product obtained by rapid cooling after profile extrusion molding under conditions where the viscosity of the molten resin when extrusion molding is 10 3 to 10 6 (Pa · s) is obtained. It is in the range of 0.2 to 2.0 mm, and the entire thickness is substantially uniform.
異形薄肉成形品を異形成形により押出成形する際に、樹脂の固化時と溶融時の比容積の差が大きいときに生じ易い波打ち現象を有効に抑制するには、前記樹脂組成物の選択と共に、更に成形条件の選択が重要である。 すなわち、異形押出成形の際に本発明の樹脂組成物と成形条件を選択することによりドローダウンが防止でき、また成形後の急冷によりシワや偏肉となるのを防ぎ、かつ波打ちも防ぐことが可能となる。 In order to effectively suppress the undulation phenomenon that is likely to occur when the difference in specific volume between the solidification and melting of the resin is large when extruding the deformed thin-walled molded product with the deformed shape, along with the selection of the resin composition, Furthermore, selection of molding conditions is important. That is, it is possible to prevent drawdown by selecting the resin composition and molding conditions of the present invention at the time of profile extrusion molding, and prevent wrinkles and uneven thickness due to rapid cooling after molding, and also prevent undulations. It becomes possible.
本発明の異形押出成形用樹脂組成物（Ｄ）を用いて、異形押出成形を行うことにより強度、剛性、表面外観性、及び成形加工性に優れ、かつ波打ちの少ない異形押出成形品が得られる。また、本発明の異形押出成形用樹脂組成物（Ｄ）を使用することにより、熱成形を行わなくとも一度の異形押出成形で所望形状の成形品が得られる。
更に、本発明の異形薄肉成形品の成形法を採用することにより、ドロ−ダウンや波打ちが大幅に改良される。
By performing the profile extrusion molding using the profile extrusion molding resin composition (D) of the present invention, a profile extrusion molded product excellent in strength, rigidity, surface appearance and molding processability and having few undulations can be obtained. . Moreover, by using the resin composition for profile extrusion molding (D) of the present invention, a molded product having a desired shape can be obtained by one profile extrusion molding without performing thermoforming.
Further, by adopting the method for forming a deformed thin-walled molded product of the present invention, the drawdown and undulation are greatly improved.
以下に本発明を詳述する。
本発明の異形押出成形用樹脂組成物（Ｄ）は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）、及びタルクからなる樹脂組成物であって、エチレン共重合体（Ａ）６０〜９５重量％とポリプロピレン系樹脂（Ｂ）５〜４０重量％からなる樹脂混合物（Ｃ）１００重量部に対し、タルクを１〜４０重量部配合して得られることを特徴とする。
The present invention is described in detail below.
The resin composition for profile extrusion molding (D) of the present invention has a density in the range of 0.860 to 0.920 g / cm 3 and a melt flow rate value measured according to ASTM D1238 at 190 ° C. and a load of 2.16 kg. An ethylene copolymer (A) having a MFR) in the range of 0.1 to 10 g / 10 min, a melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and a load of 2.16 kg is 0.2 to 3. A resin composition comprising a polypropylene resin (B) in the range of 0 g / 10 min, and talc, comprising an ethylene copolymer (A) 60 to 95% by weight and a polypropylene resin (B) 5 to 40% by weight It is obtained by blending 1 to 40 parts by weight of talc with respect to 100 parts by weight of the resin mixture (C).
本発明の樹脂混合物（Ｃ）は、密度が０．８６０〜０．９２０ｇ／ｃｍ３の範囲であり、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜１０ｇ／１０分の範囲であるエチレン共重合体（Ａ）、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分の範囲であるポリプロピレン系樹脂（Ｂ）からなる。 The resin mixture (C) of the present invention has a density in the range of 0.860 to 0.920 g / cm 3 , and a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg is 0.00. 1 to 10 g / 10 min ethylene copolymer (A), melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and 2.16 kg load is 0.2 to 3.0 g / 10 min It consists of the polypropylene resin (B) which is the range.
前記エチレン共重合体（Ａ）は、低圧法で重合されたエチレン／α−オレフィン共重合体であり、その共重合に使用されるα−オレフィンは、その炭素数が３〜１０、好ましくは４〜８のα−オレフィンであり、該α−オレフィンに由来する単位が共重合体中で３〜２５重量％、好ましくは５〜２０重量％である。α−オレフィンとしては例えば、ｎ−ブテン−１、ｎ−ヘキセン−１、ｎ−オクテン−１等が挙げられる。
エチレン共重合体（Ａ）の密度は、０．８６０〜０．９２０ｇ／ｃｍ３、好ましくは０．８６０〜０．９１５ｇ／ｃｍ３である。エチレン共重合体（Ａ）の密度を前記０．８６０ｇ／ｃｍ３以上で０．９２０ｇ／ｃｍ３以下とすることにより、熱成形性、ヒートシール性などが改善される。
また、エチレン共重合体（Ａ）の１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）は、０．１〜１０ｇ／１０分、好ましくは０．１〜２．０ｇ／１０分である。ＭＦＲが前記０．１ｇ／１０分以上で成形時の溶融性とシール性が向上し、またＭＦＲが１０ｇ／１０分以下で成形加工性をより良好に維持できる。
The ethylene copolymer (A) is an ethylene / α-olefin copolymer polymerized by a low pressure method, and the α-olefin used for the copolymerization has 3 to 10 carbon atoms, preferably 4 carbon atoms. The α-olefin of ˜8, and the unit derived from the α-olefin is 3 to 25% by weight, preferably 5 to 20% by weight in the copolymer. Examples of the α-olefin include n-butene-1, n-hexene-1, n-octene-1 and the like.
The density of the ethylene copolymer (A) is 0.860 to 0.920 g / cm 3 , preferably 0.860 to 0.915 g / cm 3 . When the density of the ethylene copolymer (A) is 0.860 g / cm 3 or more and 0.920 g / cm 3 or less, thermoformability, heat sealability, and the like are improved.
The melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. under a 2.16 kg load of the ethylene copolymer (A) is 0.1 to 10 g / 10 min, preferably 0.1 to 2.0 g. / 10 minutes. When the MFR is 0.1 g / 10 min or more, the meltability and the sealing performance at the time of molding are improved, and when the MFR is 10 g / 10 min or less, the moldability can be maintained better.
ポリプロピレン系樹脂（Ｂ）は、ポリプロピレンのホモポリマーでもよく、また共重合体でもよい。共重合体としては、プロピレンにオレフィンをランダム又はブロック共重合させたプロピレン共重合体、その他の変性ポリプロピレン樹脂等が包含される。共重合に使用されるオレフィンは、エチレンや炭素数が４〜１２、好ましくは４〜８のα−オレフィンが挙げられ、該α−オレフィンに由来する単位が共重合体中で０．５〜１２モル％、好ましくは１〜８モル％である。尚、エチレン−プロピレン共重合体中のプロピレンに由来する単位が８５モル％以上であれば、エチレン−プロピレン共重合体の使用も可能である。
ポリプロピレン系樹脂（Ｂ）は、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．２〜３．０ｇ／１０分、好ましくは０．５〜２．０ｇ／１０分である。ＭＦＲを０．２ｇ／１０分以上とすることにより異形押出成形時の押出性を良好に維持することができ、また、ＭＦＲを３．０ｇ／１０分以下とすることにより成形時のドローダウンを効果的に防止することができる。
The polypropylene resin (B) may be a polypropylene homopolymer or a copolymer. Examples of the copolymer include a propylene copolymer obtained by random or block copolymerization of olefin with propylene, and other modified polypropylene resins. Examples of the olefin used for copolymerization include ethylene and α-olefins having 4 to 12 carbon atoms, preferably 4 to 8 carbon atoms, and units derived from the α-olefin are 0.5 to 12 in the copolymer. It is mol%, preferably 1 to 8 mol%. In addition, if the unit derived from propylene in the ethylene-propylene copolymer is 85 mol% or more, the ethylene-propylene copolymer can be used.
The polypropylene resin (B) has a melt flow rate value (MFR according to ASTM D1238) measured at 230 ° C. and a load of 2.16 kg of 0.2 to 3.0 g / 10 minutes, preferably 0.5 to 2.0 g / 10 minutes. By making MFR 0.2g / 10min or more, extrudability at the time of profile extrusion molding can be maintained well, and by making MFR 3.0g / 10min or less, drawdown at molding can be reduced. It can be effectively prevented.
異形押出成形用樹脂組成物（Ｄ）中の樹脂混合物（Ｃ）は、エチレン共重合体（Ａ）６０〜９５重量％とポリプロピレン系樹脂（Ｂ）５〜４０重量％、好ましくはエチレン共重合体（Ａ）６０〜８０重量％とポリプロピレン系樹脂（Ｂ）２０〜４０重量％からなる。
エチレン共重合体（Ａ）の配合量が前記６０重量％未満では必要な柔軟性が得られない。一方、エチレン共重合体（Ａ）の配合量が前記９５重量％を超えると異形押出成形で得られる成形品の収縮率が大きくなり、また成形品が柔らかすぎて必要な剛性が得られない。
また、ポリプロピレン系樹脂（Ｂ）の配合量が前記５重量％未満では剛性が不足し、一方、前記４０重量％を超えると成形加工性が低下し、更に波打ち現象を防止するのが難しくなり、また成形品が柔らかすぎて必要な剛性が得られない。
The resin mixture (C) in the profile extrusion molding resin composition (D) is composed of 60 to 95% by weight of an ethylene copolymer (A) and 5 to 40% by weight of a polypropylene resin (B), preferably an ethylene copolymer. (A) It consists of 60 to 80% by weight and polypropylene resin (B) 20 to 40% by weight.
If the blending amount of the ethylene copolymer (A) is less than 60% by weight, necessary flexibility cannot be obtained. On the other hand, when the blending amount of the ethylene copolymer (A) exceeds 95% by weight, the shrinkage rate of the molded product obtained by the profile extrusion molding increases, and the molded product is too soft to obtain the required rigidity.
Further, if the blending amount of the polypropylene resin (B) is less than 5% by weight, the rigidity is insufficient, whereas if it exceeds 40% by weight, the moldability is deteriorated, and further, it becomes difficult to prevent the wavy phenomenon, Also, the molded product is too soft to obtain the required rigidity.
本発明に使用するタルクとしては特に制限はないが、平均粒径が０．１〜３０μｍ、特に２〜１５μｍのものが望ましい。
本発明の異形押出成形用樹脂組成物（Ｄ）は、樹脂混合物（Ｃ）１００重量部に、タルクを１〜４０重量部、好ましくは２０〜４０重量部配合して得られる。
タルクの配合量を前記１〜４０重量部の範囲とすることにより、成形品の剛性と耐熱性が改善される。尚、タルク配合量が前記２０重量部以上で充填の効果が顕著となり、一方、４０重量部を超えると通常の異形押出機での成形が困難になるおそれがある。
尚、異形押出成形用樹脂組成物（Ｄ）を得る際に、エチレン共重合体（Ａ）、ポリプロピレン系樹脂（Ｂ）、及びタルクの配合の順序に特に制限はなく、エチレン共重合体（Ａ）とポリプロピレン系樹脂（Ｂ）の混合物にタルクを添加してもよく、エチレン共重合体（Ａ）とタルクの混合物にポリプロピレン系樹脂（Ｂ）を添加してもよく、ポリプロピレン系樹脂（Ｂ）とタルクの混合物にエチレン共重合体（Ａ）を添加してもよい。
Although there is no restriction | limiting in particular as a talc used for this invention, The thing with an average particle diameter of 0.1-30 micrometers, especially 2-15 micrometers is desirable.
The resin composition (D) for profile extrusion molding of the present invention is obtained by blending 1 to 40 parts by weight, preferably 20 to 40 parts by weight of talc with 100 parts by weight of the resin mixture (C).
By setting the blending amount of talc in the range of 1 to 40 parts by weight, the rigidity and heat resistance of the molded product are improved. In addition, when the amount of talc is 20 parts by weight or more, the effect of filling becomes remarkable. On the other hand, when it exceeds 40 parts by weight, there is a possibility that molding with a normal profile extruder becomes difficult.
In addition, there is no restriction | limiting in particular in the order of a mixing | blending of an ethylene copolymer (A), a polypropylene resin (B), and a talc when obtaining the resin composition for profile extrusion molding (D), and ethylene copolymer (A ) And polypropylene resin (B) may be added to talc, or polypropylene resin (B) may be added to the mixture of ethylene copolymer (A) and talc, and polypropylene resin (B). The ethylene copolymer (A) may be added to a mixture of talc and talc.
本発明の異形押出成形用樹脂組成物（Ｄ）は、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が好ましくは０．１〜３０ｇ／１０分、特に好ましくは０．１〜１０ｇ／１０分の範囲である。
前記メルトフローレート値を０．１ｇ／１０分以上とすることにより成形加工性が向上して、また３０ｇ／１０分以下とすることにより、ドローダウンを防止でき、押出成形を可能にしている。
The resin composition (D) for profile extrusion molding of the present invention preferably has a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg, preferably 0.1 to 30 g / 10 min, particularly preferably. The range is 0.1 to 10 g / 10 minutes.
By setting the melt flow rate value to 0.1 g / 10 min or more, molding processability is improved, and by setting the melt flow rate value to 30 g / 10 min or less, drawdown can be prevented and extrusion molding can be performed.
本発明の異形押出成形用樹脂組成物（Ｄ）には、無機系の他の充填剤、例えば炭酸カルシウム、マイカ、ガラス繊維等、あるいは有機系の充填剤、例えばポリエステル、ポリアミド繊維等、その他に難燃剤、安定剤、紫外線吸収剤、酸化防止剤、可塑剤、滑剤等の各種添加剤や染料、顔料等の着色剤などの添加剤を添加することができる。 In the profile extrusion molding resin composition (D) of the present invention, other inorganic fillers such as calcium carbonate, mica, glass fiber, etc., or organic fillers such as polyester, polyamide fiber, etc. Various additives such as flame retardants, stabilizers, ultraviolet absorbers, antioxidants, plasticizers and lubricants, and additives such as colorants such as dyes and pigments can be added.
本発明の異形薄肉成形品は、異形押出成形用樹脂組成物（Ｄ）を押出成形して得られる、厚みが０．２〜２．０ｍｍの範囲であり、かつ成形品全体の厚みがほぼ均一であることを特徴とする。
異形押出成形用樹脂組成物（Ｄ）を使用して押出成形することにより、厚みが０．２〜２．０ｍｍの範囲であり、かつ成形品全体の厚みがほぼ均一である異形薄肉成形品を得ることができる。
従来、ポリエチレン系樹脂組成物、またはポリプロピレン系樹脂組成物を用いて、成形して得られる厚みが０．２〜２．０ｍｍ程度の異形薄肉成形品は、電気絶縁材料、工業用部品材料、建築用材料等の分野への用途が期待されていたが、ソリや波打ちの少ないものを成形することは困難であった。しかし、異形押出成形用樹脂組成物（Ｄ）を使用して成形条件を選択することにより、ソリや波打ちの少ない、厚みが０．２〜２．０ｍｍ程度の異形薄肉成形品を成形することが可能となったのである。
また、成形品全体の厚みをほぼ均一とすることにより、薄肉の異形押出成形品に生ずるソリを有効的に防ぐことができる。
The deformed thin-walled molded product of the present invention is obtained by extruding the resin composition (D) for profile extrusion molding, the thickness is in the range of 0.2 to 2.0 mm, and the thickness of the entire molded product is almost uniform. It is characterized by being.
By performing extrusion molding using the resin composition (D) for profile extrusion molding, a profile thin molded product having a thickness in the range of 0.2 to 2.0 mm and a substantially uniform thickness of the entire molded product is obtained. Can be obtained.
Conventionally, a deformed thin molded product having a thickness of about 0.2 to 2.0 mm obtained by molding using a polyethylene resin composition or a polypropylene resin composition is an electrically insulating material, an industrial part material, an architecture. Although it was expected to be used in the field of materials, etc., it was difficult to mold a product with little warping or undulation. However, by selecting the molding conditions using the profile extrusion molding resin composition (D), it is possible to mold a profile thin molded product having a thickness of about 0.2 to 2.0 mm with little warpage and undulation. It became possible.
In addition, by making the thickness of the entire molded product substantially uniform, warping generated in a thin profile extrusion-molded product can be effectively prevented.
本発明の異形薄肉成形品は少なくとも２つの薄肉面の接合部を有する異形薄肉成形品を成形可能なことにとしたことに特徴がある。また、押出方向と直交する方向の幅が３ｃｍ以上の成形品を成形可能なことにとしたことに特徴がある。 The deformed thin-walled molded product of the present invention is characterized in that it can form a deformed thin-walled molded product having at least two thin-walled joints. Further, the present invention is characterized in that a molded product having a width of 3 cm or more in a direction orthogonal to the extrusion direction can be formed.
本発明の異形薄肉成形品の成形法は、異形押出成形用樹脂組成物（Ｄ）を使用して、厚みが０．２〜２．０ｍｍで、且つ成形品全体の厚みがほぼ均一の異形薄肉成形品を押出成形する際に、該樹脂組成物の溶融粘度が１０３〜１０６（Ｐa・s）となる条件下で異形押出成形後、直ちに急冷することを特徴とする。
本発明において、押出成形する際の溶融樹脂の粘度は、１０３〜１０６（Ｐa・s）、好ましくは１０４〜１０５（Ｐa・s）である。
溶融粘度を前記１０３（Ｐa・s）以上とすることにより、ドローダウンを防止して押出成形が可能となり、また前記１０６（Ｐa・s）以下とすることにより、溶融樹脂の流動性を維持して押出成形を可能にしている。
更に、溶融樹脂を押出後、急冷することにより生ずる冷却ムラによって発生する収縮差を吸収し、波打ち現象を有効に防止できる。尚、押し出された成形品を徐冷すると、成形品の結晶化度が大きなって、大きく収縮し、寸法変化も大となり平面の垂直方向に大きく波打ち現象が生ずる。
また、従来、成形が困難であった厚みが０．２〜２．０ｍｍで、且つ成形品全体の厚みがほぼ均一である異形薄肉成形品を異形押出成形可能としたことに本発明の成形法の特徴がある。
The method for molding an irregularly thin molded product according to the present invention uses an irregularly shaped resin composition (D) for extrusion molding, and has an irregularly thin wall with a thickness of 0.2 to 2.0 mm and a substantially uniform thickness of the entire molded product. When extruding a molded article, the resin composition is characterized by being rapidly cooled immediately after profile extrusion under conditions where the melt viscosity of the resin composition is 10 3 to 10 6 (Pa · s).
In the present invention, the viscosity of the molten resin during extrusion molding is 10 3 to 10 6 (Pa · s), preferably 10 4 to 10 5 (Pa · s).
By making the melt viscosity 10 3 (Pa · s) or more, it becomes possible to perform extrusion molding while preventing drawdown, and by making the melt viscosity 10 6 (Pa · s) or less, the fluidity of the molten resin is improved. Maintain and enable extrusion.
Further, the difference in shrinkage caused by uneven cooling caused by rapid cooling after extrusion of the molten resin can be absorbed, and the wavy phenomenon can be effectively prevented. When the extruded molded product is gradually cooled, the crystallinity of the molded product is increased, the molded product is greatly contracted, the dimensional change is increased, and a wavy phenomenon is generated in the vertical direction of the plane.
Further, the molding method according to the present invention has made it possible to form a modified thin-walled molded product having a thickness of 0.2 to 2.0 mm, which has conventionally been difficult to mold, and a substantially uniform thickness of the entire molded product, by the profile extrusion molding. There are features.
本発明の成形法において、急冷手段は、水による直接冷却が望ましい。水を使用した冷却は冷却速度が早く、複雑な冷却装置も必要でない。尚、使用する水は温度制御してリサイクルするのが望ましい。 In the molding method of the present invention, the rapid cooling means is preferably direct cooling with water. Cooling using water has a high cooling rate and does not require a complicated cooling device. In addition, it is desirable to recycle the water used by controlling the temperature.
本発明の成形法において、異形薄肉成形品が少なくとも２つの薄肉面の接合部を有することを特徴とすること、及び異形薄肉成形品が３ｃｍ以上の押出方向と直交する方向の幅を有することは前記した通りである。 In the molding method of the present invention, the modified thin-walled molded product has at least two thin-walled joints, and the modified thin-walled molded product has a width in a direction perpendicular to the extrusion direction of 3 cm or more. As described above.
本発明の異形押出成形用樹脂組成物（Ｄ）は、エチレン共重合体（Ａ）、ポリプロピレン系樹脂（Ｂ）、及びタルクに必要により安定剤、滑剤、着色剤等を添加して１６０〜２１０℃、好ましくは１７０〜２０５℃で、３０秒〜３０分間、好ましくは１〜２０分間、加熱下に溶融混練して得ることができる。
加熱下での混練に用いられる装置としては、前記条件で加熱混練が可能なものであれば特に限定されず、例えばブレンダー、ニーダー、ミキシングロール、バンバリーミキサー、１軸もしくは２軸の押出機などが挙げられる。
The resin composition (D) for profile extrusion molding according to the present invention has a stabilizer, a lubricant, a colorant and the like added to the ethylene copolymer (A), the polypropylene resin (B), and talc as necessary. It can be obtained by melting and kneading with heating at 170 ° C., preferably 170 to 205 ° C., for 30 seconds to 30 minutes, preferably 1 to 20 minutes.
The apparatus used for kneading under heating is not particularly limited as long as it can be kneaded under the above conditions. For example, a blender, kneader, mixing roll, Banbury mixer, monoaxial or biaxial extruder, etc. Can be mentioned.
好ましい製造方法としては、例えば、各成分を重量フィーダーにより2軸押出機のホッパー部へ直接投入し、２軸押出機で混練ゾーンの設定温度を前記温度に設定して混練し、組成物を混練状態で反応させて複合材を得る。なお、温度が２１０℃以上では樹脂の分解によるガスが発生するため、混練温度が２１０℃を超えないように注意する必要がある。そのため、冷却コントロールの効く押出機等を使用するのが好ましい。
このようにして得られた本発明の異形押出成形用樹脂組成物（Ｄ）は、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が０．１〜３０ｇ／１０分、好ましくは０．１〜１０ｇ／１０分の範囲となり、異形薄肉成形品を押出成形する際に、該樹脂組成物の溶融粘度も１０３〜１０６（Ｐa・s）に制御することが可能となる。 前記溶融混練して得られた異形押出成形用樹脂組成物（Ｄ）を押出機のダイの温度を約２００℃として押出し、得られた異形成形品を水により直接急冷して成形品を得るのが好ましい。成形により得られた成形品は、適度な剛性を有し、引張強度、伸び、引裂き強度に優れ、かつそりと波打ちの極めて少ないものである。
As a preferable production method, for example, each component is directly fed into a hopper part of a twin-screw extruder by a weight feeder, and the composition is kneaded by setting the set temperature of the kneading zone to the above temperature with the twin-screw extruder. It reacts in a state, and a composite material is obtained. In addition, since the gas by decomposition | disassembly of resin will generate | occur | produce when temperature is 210 degreeC or more, it needs to be careful so that kneading | mixing temperature may not exceed 210 degreeC. Therefore, it is preferable to use an extruder or the like that is effective in cooling control.
The profile extrusion molding resin composition (D) of the present invention thus obtained has a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg of 0.1 to 30 g / 10. Minutes, preferably in the range of 0.1 to 10 g / 10 minutes, and when extruding a deformed thin-walled molded product, the melt viscosity of the resin composition can be controlled to 10 3 to 10 6 (Pa · s). It becomes possible. The resin composition for profile extrusion molding (D) obtained by melt-kneading is extruded at an extruder die temperature of about 200 ° C., and the profile-shaped product obtained is directly quenched with water to obtain a molded product. Is preferred. A molded product obtained by molding has moderate rigidity, excellent tensile strength, elongation and tear strength, and extremely little warpage and undulation.
本発明の異形押出成形用樹脂組成物（Ｄ）の利用分野は特に制限されず、従来から熱可塑性樹脂の押出成形品が用いられている多くの分野に使用することができるが、電気絶縁材料、工業用部品材料、建築用材料等の分野に好適に利用でき、中でも住宅部材、建築材料、家電製品の材料として特に好適に利用できる。 具体的には、巾木、ドア材、外壁材、カウンター材、基礎受け板、窓枠、壁材、廻り縁木、建具天井材、下地材、遮蔽板、遮音板、前板裏板、棚板、袖板、幕板、背板、座板、厨房部材、防水材、雨戸板、腰板、側板、バス壁、などの材料として、特にバルコニー廻りの防水部材に好適に利用できる。 以下、実施例、比較例により本発明を更に具体的に説明する。 The field of application of the profile extrusion molding resin composition (D) of the present invention is not particularly limited, and can be used in many fields where thermoplastic resin extruded products have been used. It can be suitably used in the fields of industrial part materials, building materials, and the like, and can be particularly suitably used as materials for housing members, building materials, and home appliances. Specifically, baseboards, door materials, outer wall materials, counter materials, foundation backing plates, window frames, wall materials, surrounding wood, joinery ceiling materials, base materials, shielding plates, sound insulation plates, front plate back plates, shelves As a material such as a board, a sleeve board, a curtain board, a back board, a seat board, a kitchen member, a waterproof material, a shutter board, a waist board, a side board, and a bus wall, it can be suitably used particularly for a waterproof member around a balcony. Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
密度が０．９００ｇ／ｃｍ３で、１９０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が１．０ｇ／１０分であるエチレン共重合体（三井化学（株）製、商品名：エボリューＳＰ０５１０）７０重量％と、２３０℃、２．１６ｋｇ荷重で測定したメルトフローレート値（ＡＳＴＭ Ｄ１２３８によるＭＦＲ）が１．５ｇ／１０分であるポリプロピレン系樹脂（三井化学（株）製、商品名：三井ポリプロＪ６０２ＷＡ）３０重量％からなる樹脂混合物１００重量部に対し、タルクを２５重量部となるように配合して、単軸押出機（Ｌ／Ｄ：２８、スクリュー径：６５ｍｍφ）を用いて、１８０〜２００℃に加熱して溶融混練した。
次に、押出機のダイの温度を約２００℃にして、幅が１５０ｍｍの面の端部から上方に直角方向に４０ｍｍ伸びた面を有し、更に該面の他端部から、幅が１５０ｍｍの面の反対方向に直角方向に１０ｍｍに伸びた、全体の厚みが０．５ｍｍの異形成形品を連続的に押出した。押し出された成形品はガイドに固定された状態で水より直接急冷させて、３０℃以下とした。
得られた成形品は、適度な剛性と柔軟性のバランスを有し、引張強度、伸び、引裂き強度に優れ、かつそりと波打ちの極めて少ないものであった。
An ethylene copolymer having a density of 0.900 g / cm 3 and a melt flow rate value (MFR according to ASTM D1238) measured at 190 ° C. and a load of 2.16 kg of 1.0 g / 10 min (manufactured by Mitsui Chemicals, Inc.) , Trade name: Evolue SP0510) Polypropylene resin (Mitsui Chemical Co., Ltd.) having a melt flow rate value (MFR according to ASTM D1238) of 1.5 g / 10 min measured at 70% by weight, 230 ° C. and 2.16 kg load Manufactured and trade name: Mitsui Polypro J602WA) 100 parts by weight of a resin mixture consisting of 30% by weight, talc is blended to 25 parts by weight, single screw extruder (L / D: 28, screw diameter: 65 mmφ) ) To 180-200 ° C. and melt-kneaded.
Next, the temperature of the die of the extruder is set to about 200 ° C., and the surface has a surface extending 40 mm perpendicularly upward from the end of the surface having a width of 150 mm, and further, the width is 150 mm from the other end of the surface. An irregularly shaped product having an overall thickness of 0.5 mm and extending 10 mm in a direction perpendicular to the opposite direction of the surface was continuously extruded. The extruded molded product was directly cooled from water while being fixed to the guide, and was adjusted to 30 ° C. or lower.
The obtained molded product had an appropriate balance between rigidity and flexibility, was excellent in tensile strength, elongation and tear strength, and had very little warpage and undulation.
［比較例１］
実施例１で使用したエチレン共重合体の代わりに、低密度ポリエチレン（ＬＤＰＥ）（密度：０．９２５ｇ／ｃｍ３）を使用して押出成形した以外は、実施例１と同様にして成形品を得た。得られた成形品は、柔軟性は確保できたが、剛性が低く波打ち現象が大であった。
[Comparative Example 1]
A molded article was obtained in the same manner as in Example 1, except that low-density polyethylene (LDPE) (density: 0.925 g / cm 3 ) was used instead of the ethylene copolymer used in Example 1. Obtained. The obtained molded product was able to secure flexibility, but had low rigidity and a large waviness phenomenon.
本発明の異形押出成形用樹脂組成物を成形して得られた異形薄肉成形品は、住宅部材、建築材料、家電製品の材料として特に好適に利用でき、特に建築材料の中でバルコニー廻りの防水部材に好適に利用できる。 The shaped thin molded product obtained by molding the resin composition for profile extrusion molding of the present invention can be particularly suitably used as a material for housing members, building materials, and home appliances, and is particularly waterproof around the balcony among building materials. It can utilize suitably for a member.
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