JP2004204198A - Polypropylene alloy having improved impact resistance - Google Patents

Polypropylene alloy having improved impact resistance Download PDF

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Publication number
JP2004204198A
JP2004204198A JP2002383542A JP2002383542A JP2004204198A JP 2004204198 A JP2004204198 A JP 2004204198A JP 2002383542 A JP2002383542 A JP 2002383542A JP 2002383542 A JP2002383542 A JP 2002383542A JP 2004204198 A JP2004204198 A JP 2004204198A
Authority
JP
Japan
Prior art keywords
rubber
sebs
butadiene
ethylene
impact strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002383542A
Other languages
Japanese (ja)
Inventor
Masafumi Emoto
雅文 江本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MASSTECH KK
Mastec Ltd
Original Assignee
MASSTECH KK
Mastec Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MASSTECH KK, Mastec Ltd filed Critical MASSTECH KK
Priority to JP2002383542A priority Critical patent/JP2004204198A/en
Publication of JP2004204198A publication Critical patent/JP2004204198A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To improve impact strength of PP (polypropylene) alloy prepared by using RTPO (copolymer of PP and EP rubber (ethylene-propylene rubber) reacted therebetween). <P>SOLUTION: The impact strength of the starting material is improved by increasing the concentration of butadiene in SEBS (styrene-ethylene-butadiene-styrene block copolymer) to be added to 60% or more, by allowing SEBS to function as a compatibilizing material between PP and EP rubber of the RTPO, and by finely dispersing the EP rubber. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は自動車内外装用材料に係わるものであり、詳しくは自動車のダッシュボード、ドアトリムおよびバンパー等の機能向上に関するものである。
【0002】
【従来の技術】
自動車用内外装材は、ポリプロピレン(以下、PPという)とエチレンプロピレンラバー(以下、EPラバーという)を反応共重合したコポリマー(以下、RTPOという)を主原料として、剛性確保の為にタルクを添加し、衝撃強度向上のためにエチレンプロピレンラバー(EPM)、エチレンブテンラバー(EBM)およびエチレンオクテンラバー(EOM)等のゴムを添加したものをコンパウンド工程でアロイ化し、それを射出成形用にペレタイズしたものが知られている。
【0003】
【発明が解決しようとする課題】
主原料であるPPとEPラバーを重合したコポリマーは、EPラバー量を増加させ、RTPO化すると、分散したEPラバーのサイズが大きくなり、十分な衝撃力を得ること出来なくなる問題点があった。
【0004】
本発明は、従来の技術に有するこのような問題点を鑑みてなされたものであり、その目的とするところは、素材衝撃強度を向上させることである。
【0006】
【課題を解決するための手段】
上記目的を達成させるために、本考案で添加した60%以上のブタジエン濃度が60%以上のスチレンエチレンブタジエンスチレンブロックコポリマー(以下、SEBSという)またはスチレンエチレンブタジエンオレフィン結晶ブロックコポリマー(以下、SEBCという)はPPコポリマー内のPPとEPラバー双方に対して相溶性があるため、分散しているEPラバーを更に微分散化させ、素材の衝撃強度を向上させる働きをする。
【0007】
【発明実施の形態】
考案の実施の形態について図面を参照して説明する。
図1はアロイのモロフォロジーをベースにしたPPすなわちポリプロピレン、SEBSおよびEPラバーの構造図である。
【0008】
SEBCの場合はポリスチレンの一方のドメインがオレフィン結晶のドメインに置き換わるだけで、基本的な働きは同様である。
【0009】
PP1マトリックスの海の中にEPラバードメイン2がSEBS相溶化作用のため、微分散化され、浮かんでいる状態にある。その際SEBSはポリスチレンドメイン3をEPラバードメイン2の周囲に形成し、そのEBチェイン5がEPラバードメイン2に食い込む一方、PPアモルファスチェイン4ともからみ合っている状態にある。
【0010】
SEBSはPP1とEPラバードメイン2の中間で両者を強く結び付ける作用を行っている。衝撃が加わった場合でも、中間弾性材として作用し材料に亀裂を入れにくくする。
【0011】
EPラバーはそれ自体衝撃性に優れた素材であることは一般に知られており、また、EPラバーをPPに加え、その特性によりPPの衝撃性を向上させることも一般に知られている。
【0012】
EPラバーはSEBSまたはSEBCで微分散化されてEPラバードメイン2になっても分子構造そのものは変化しないため、その特性は維持される。したがって、微分散化したEPラバーのPPに対する総接触面積が向上し、更にSEBSまたはSEBCにより結合力が向上した分だけ、衝撃性は改善されることになる。
【0013】
図2の示す通り、ブタジエン濃度が60%を超えると素材の衝撃値(Izod衝撃値)が飛躍的に向上することが分かる。
【0014】
【発明の効果】
本考案は、上述のとおり構成され機能しているので、次に記載する効果を奏する。
【0015】
従来と同等の剛性を持つ内外装用素材であるが、十分な耐衝撃強度を有する。
【0016】
従来材と同様に射出成形により自動車のダッシュボード、ドアトリムおよびバンパーを成形できる。
【図面の簡単な説明】
【図1】PP、EPラバー、SEBSアロイの構造図
【符号の説明】
1 PP
2 EPラバードメイン
3 ポリスチレンドメイン
4 PPアモルファスチェイン
5 EBチェイン
【図2】
ブタジエン濃度とIZOD衝撃強度のグラフ
【符号の説明】
1 ブタジエン濃度
2 IZOD衝撃強度(23℃)Kg.cm/cm
3 材料の構成 RTPO/SEBS/タルク=70/10/20
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle interior / exterior material, and more particularly, to a function improvement of a dashboard, a door trim, a bumper, and the like of a vehicle.
[0002]
[Prior art]
The interior and exterior materials for automobiles are mainly made of a copolymer (hereinafter referred to as RTPO) obtained by reaction copolymerization of polypropylene (hereinafter referred to as PP) and ethylene propylene rubber (hereinafter referred to as EP rubber), and talc is added for securing rigidity. Then, rubbers such as ethylene propylene rubber (EPM), ethylene butene rubber (EBM) and ethylene octene rubber (EOM) were added to improve the impact strength, alloyed in a compounding process, and pelletized for injection molding. Things are known.
[0003]
[Problems to be solved by the invention]
Copolymers obtained by polymerizing PP and EP rubber, which are main raw materials, have a problem that when the amount of EP rubber is increased and RTPO is used, the size of dispersed EP rubber becomes large, and sufficient impact force cannot be obtained.
[0004]
The present invention has been made in view of such problems in the conventional technology, and an object of the present invention is to improve material impact strength.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a styrene-ethylene-butadiene-styrene block copolymer (hereinafter referred to as SEBS) or a styrene-ethylene-butadiene olefin crystal block copolymer (hereinafter referred to as SEBC) having a butadiene concentration of 60% or more added in the present invention. Is compatible with both PP and EP rubber in the PP copolymer, so that the dispersed EP rubber can be further finely dispersed to improve the impact strength of the material.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a structural drawing of PP, ie, polypropylene, SEBS and EP rubber based on alloy morphology.
[0008]
In the case of SEBC, the basic function is the same, except that one domain of polystyrene is replaced with a domain of an olefin crystal.
[0009]
EP rubber domain 2 is finely dispersed and floating in the sea of the PP1 matrix due to the SEBS compatibilizing action. At that time, the SEBS forms the polystyrene domain 3 around the EP rubber domain 2, and its EB chain 5 bites into the EP rubber domain 2, while being intertwined with the PP amorphous chain 4.
[0010]
SEBS acts to strongly link the two between PP1 and EP rubber domain 2. Even if an impact is applied, it acts as an intermediate elastic material, making it difficult for the material to crack.
[0011]
It is generally known that EP rubber itself is a material having excellent impact properties, and it is also generally known that EP rubber is added to PP to improve the impact properties of PP by its properties.
[0012]
Even if EP rubber is finely dispersed in SEBS or SEBC to become EP rubber domain 2, the molecular structure itself does not change, so that its characteristics are maintained. Therefore, the total contact area of the finely dispersed EP rubber with PP is improved, and the impact strength is improved by the improvement of the bonding force by SEBS or SEBC.
[0013]
As shown in FIG. 2, it can be seen that when the butadiene concentration exceeds 60%, the impact value (Izod impact value) of the material is dramatically improved.
[0014]
【The invention's effect】
Since the present invention is configured and functions as described above, it has the following effects.
[0015]
It is a material for interior and exterior that has the same rigidity as before, but has sufficient impact strength.
[0016]
Car dashboards, door trims and bumpers can be formed by injection molding in the same manner as conventional materials.
[Brief description of the drawings]
FIG. 1 is a structural diagram of PP, EP rubber, and SEBS alloy.
1 PP
2 EP rubber domain 3 Polystyrene domain 4 PP amorphous chain 5 EB chain [Fig. 2]
Graph of butadiene concentration and IZOD impact strength [Explanation of symbols]
1 Butadiene concentration 2 IZOD impact strength (23 ° C) Kg. cm / cm
3 Material composition RTPO / SEBS / talc = 70/10/20

Claims (1)

エチレンプロピレンラバーが20%以上入った反応共重合によるポリプロピレンコポリマーとブタジエン濃度が60%以上のスチレンエチレンブタジエンスチレンブロックコポリマーまたはスチレンエチレンブタジエンオレフィン結晶ブロックコポリマーを主原料としたポリプロピレンのアロイAlloys of polypropylene based on a reaction copolymer containing 20% or more of ethylene propylene rubber and a styrene ethylene butadiene styrene block copolymer or a styrene ethylene butadiene olefin crystal block copolymer having a butadiene concentration of 60% or more.
JP2002383542A 2002-12-25 2002-12-25 Polypropylene alloy having improved impact resistance Pending JP2004204198A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002383542A JP2004204198A (en) 2002-12-25 2002-12-25 Polypropylene alloy having improved impact resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002383542A JP2004204198A (en) 2002-12-25 2002-12-25 Polypropylene alloy having improved impact resistance

Publications (1)

Publication Number Publication Date
JP2004204198A true JP2004204198A (en) 2004-07-22

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Family Applications (1)

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JP2002383542A Pending JP2004204198A (en) 2002-12-25 2002-12-25 Polypropylene alloy having improved impact resistance

Country Status (1)

Country Link
JP (1) JP2004204198A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100608138B1 (en) 2005-02-25 2006-08-02 삼성토탈 주식회사 Polypropylene resin compositions with high flow and high impact resistance for automotive exterior part
WO2018079621A1 (en) 2016-10-26 2018-05-03 株式会社Adeka Novel compound, composition including same, olefin-based resin composition, molded article thereof, and method for improving impact resistance of molded article

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100608138B1 (en) 2005-02-25 2006-08-02 삼성토탈 주식회사 Polypropylene resin compositions with high flow and high impact resistance for automotive exterior part
WO2018079621A1 (en) 2016-10-26 2018-05-03 株式会社Adeka Novel compound, composition including same, olefin-based resin composition, molded article thereof, and method for improving impact resistance of molded article
KR20190077427A (en) 2016-10-26 2019-07-03 가부시키가이샤 아데카 Novel compound, composition using the same, olefin resin composition, method for improving impact resistance of molded articles and molded articles thereof

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