JPH0689215B2 - Bumper composition - Google Patents
Bumper compositionInfo
- Publication number
- JPH0689215B2 JPH0689215B2 JP61181909A JP18190986A JPH0689215B2 JP H0689215 B2 JPH0689215 B2 JP H0689215B2 JP 61181909 A JP61181909 A JP 61181909A JP 18190986 A JP18190986 A JP 18190986A JP H0689215 B2 JPH0689215 B2 JP H0689215B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- composition
- bumper
- block copolymer
- polymer blocks
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、特殊な水素添加ブロツク共重合体、ポリオレ
フイン及びエチレン・プロピレンゴムから成る熱可塑性
組成物からなり、容易に射出成形がかつポリウレタンバ
ンパーと同様の柔軟性その他特性を有するバンパーを得
んとするものである。DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention comprises a thermoplastic composition comprising a special hydrogenated block copolymer, polyolefin and ethylene-propylene rubber, which is easily injection molded and has a polyurethane bumper. It is intended to obtain a bumper having the same flexibility and other characteristics as described in.
（従来技術とその問題点） 近年自動車のバンパー素材には、軽量化、一体化による
工程簡略化等を目的にプラスチツクが採用されている。
一例として、特に高級車用の高柔軟性バンパーにはポリ
ウレタン等の熱硬化性樹脂が使用されているが、熱硬化
性であるが故に、素材のリワーク性、工程簡略性に問題
を有する。(Prior art and its problems) In recent years, plastics have been adopted as bumper materials for automobiles for the purpose of weight reduction and simplification of the process by integration.
As an example, a thermosetting resin such as polyurethane is used for a highly flexible bumper especially for high-class vehicles, but since it is thermosetting, it has problems in reworkability of the material and process simplification.
（問題点解決の手段） 本発明者は、従来技術の上述の問題点を解決すべく鋭意
研究した結果、下記組成物を発見し、本発明を完成し
た。すなわち、 （１） ビニル芳香族化合物を主体とする重合体ブロツ
クＡを少なくとも２個、共役ジエン化合物を主体とする
重合体ブロツクＢを少なくとも２個有し、重合体ブロツ
クＢの少なくとも１個は未端ブロツクであるブロツク共
重合体に水素添加して得られる水素添加ブロツク共重合
体30〜40重量％ （２） ポリオレフイン30〜55重量％ （３） エチレン・プロピレンゴム40〜５重量％ からなる組成物が、ポリウレタンバンパーと同様の柔軟
性、耐衝撃性、塗装性を有し、射出成形により容易にバ
ンパー成形が可能であることを見い出した。(Means for Solving Problems) As a result of earnest research to solve the above-mentioned problems of the prior art, the present inventor discovered the following composition and completed the present invention. That is, (1) at least two polymer blocks A containing a vinyl aromatic compound as a main component and at least two polymer blocks B containing a conjugated diene compound as a main component, and at least one of the polymer blocks B is not yet included. Hydrogenated block copolymer obtained by hydrogenating a block copolymer which is an end block 30 to 40% by weight (2) Polyolefin 30 to 55% by weight (3) Composition consisting of ethylene and propylene rubber 40 to 5% by weight It was found that the product has the same flexibility, impact resistance, and paintability as the polyurethane bumper, and that bumper molding can be easily performed by injection molding.
以下各成分について説明する。Each component will be described below.
水素添加ブロック共重合体を構成するＡ、Ｂ各成分の代
表的な例は下記の通りである。Ａ成分としては、スチレ
ン、α−メチルスチレン、ビニルトルエン、ｐ−tert−
ブチルスチレン等、Ｂ成分としては、ブタジエン、イソ
プレン、1,3−ペンタジエン、2,3−ジメチル−1,3−ブ
タジエン等があげられる。Representative examples of each of the components A and B constituting the hydrogenated block copolymer are as follows. As the component A, styrene, α-methylstyrene, vinyltoluene, p-tert-
Examples of the B component such as butylstyrene include butadiene, isoprene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene.
水素添加ブロツク共重合体における水素添加率はブロツ
クＡ部は25％以下、ブロツクＢ部は95％が好ましい。The hydrogenation rate of the hydrogenated block copolymer is preferably 25% or less in the block A portion and 95% in the block B portion.
Ａ部の水素添加率が25％を超えると組成物の機械強度、
耐衝撃性が低下する傾向が生じ、Ｂ部の水素添加率が95
％未満だと、耐熱、耐候性が悪化する傾向を生じる。When the hydrogenation rate of part A exceeds 25%, the mechanical strength of the composition,
The impact resistance tends to decrease, and the hydrogenation rate of part B is 95
If it is less than%, heat resistance and weather resistance tend to deteriorate.
水素添加ブロツク共重合体の数平均分子量は5,000〜1,0
00,000好ましくは30,000〜500,000が適当である。数平
均分子量が5,000未満では、組成物の機械強度、耐衝撃
性を低下せしめ、又、1,000,000を超えると組成物の流
動特性を著しく低下せしめる。Number average molecular weight of hydrogenated block copolymer is 5,000 to 1,0
00,000, preferably 30,000 to 500,000 is suitable. When the number average molecular weight is less than 5,000, the mechanical strength and impact resistance of the composition are lowered, and when it exceeds 1,000,000, the flow characteristics of the composition are remarkably lowered.
末端ブロツク共重合体Ｂの含有量は、ブロツク共重合体
Ａの全量に対して0.1〜1.0重量比が好ましい。末端ブロ
ツク共重合Ｂが全くないか、あつても0.1未満の場合、
本願発明組成物の各成分の相溶状態が好ましくなく、耐
衝撃性や塗装性に劣る。また該重量が1.0重量比を越え
ると、組成物の機械的強度が劣る。The content of the terminal block copolymer B is preferably 0.1 to 1.0 weight ratio with respect to the total amount of the block copolymer A. If there is no end block copolymerization B or if it is less than 0.1 at all,
The compatible state of each component of the composition of the present invention is not preferable, and the impact resistance and paintability are poor. On the other hand, when the weight exceeds 1.0 weight ratio, the mechanical strength of the composition becomes poor.
組成物中での水素添加ブロツク共重合成分の含有量は30
〜40重量％が好ましい。30重量％未満では柔軟性及び耐
衝撃性に劣り、40重量％を越えると柔軟性が良過ぎ寸法
安定性がなくなる。ポリオレフインとしては、プロピレ
ンのホモポリマーやエチレンとの共重合体（ランダム
型、あるいはブロツク型）、ポリエチレン等が好適であ
る。その他特願昭59−155434号、第23頁、下から第５行
目以降に記載のポリオレフインが用いられる。The content of hydrogenated block copolymerization component in the composition was 30
-40% by weight is preferred. If it is less than 30% by weight, the flexibility and impact resistance are poor, and if it exceeds 40% by weight, the flexibility is too good and the dimensional stability is lost. As the polyolefin, a homopolymer of propylene, a copolymer with ethylene (random type or block type), polyethylene and the like are preferable. In addition, the polyolefins described in Japanese Patent Application No. 59-155434, page 23, line 5 from the bottom are used.
ポリオレフインの含有量は30〜55重量％が好ましい。30
重量％未満では、柔軟性が良過ぎ寸法安定性に劣る。55
重量％を越えると、柔軟性及び耐衝撃性が悪くなる。The content of polyolefin is preferably 30 to 55% by weight. 30
If it is less than wt%, the flexibility is too good and the dimensional stability is poor. 55
When it exceeds the weight%, flexibility and impact resistance deteriorate.
エチレン・プロピレンゴムとしては、加硫ゴム用とされ
るジエン系第三成分を全く有しないタイプが好ましく、
いわゆるプラスチツクブレンド用の熱可塑性ペレツトと
して市販されているものが最適である。その中でもメル
トフローインデツクスが0.5g/10分（230℃で2.16kg荷
重）以上のものが流動性の点で好ましい。As the ethylene / propylene rubber, a type having no diene-based third component used for vulcanized rubber is preferable,
What is commercially available as a thermoplastic pellet for so-called plastic blends is most suitable. Among them, those having a melt flow index of 0.5 g / 10 minutes (2.16 kg load at 230 ° C.) or more are preferable in terms of fluidity.
エチレン・プロピレンゴムの含有量は40〜５重量％が好
ましい。40重量％を超えると耐衝撃性や塗装性が低下す
る。５重量％未満では組成物の機械的強度が低くなる。The content of ethylene / propylene rubber is preferably 40 to 5% by weight. If it exceeds 40% by weight, impact resistance and paintability are deteriorated. If it is less than 5% by weight, the mechanical strength of the composition tends to be low.
本願組成物としては、その他に可塑剤、安点剤、顔料、
発泡剤、充填剤等、ゴム、プラスチツク分野で一般に用
いられるものを必要に応じて配合しても良い。Examples of the composition of the present application include a plasticizer, an eye drop, a pigment,
A foaming agent, a filler and the like, which are generally used in the field of rubber and plastics, may be blended as necessary.
（実施例） 下表に示す配合物をヘンシエルミキサーでブレンドし押
出機（65mmφ２軸押出機）にて混合、ペレタイズした。
このペレツトを用い射出成型機にて斜視図第１図に示し
たバンパー状成形物を得た。１は本体、２は補強用リブ
である。(Example) The compounds shown in the following table were blended with a Henschel mixer, mixed with an extruder (65 mmφ twin-screw extruder), and pelletized.
Using this pellet, an injection molding machine was used to obtain a bumper-shaped molded product shown in FIG. Reference numeral 1 is a main body, and 2 is a reinforcing rib.
耐衝撃エネルギーの測定： レオメトリツクス社、Drop Weight Tester−40℃、11m/
sec 塗装性の判定： プライマー処理無のウレタン塗装（関西ペイント レタ
ンPG−80）60×15分焼付後、ゴバン目テスト。○ 100
％剥離なし、△ 50％剥離有り 押出条件： 温 度 ホツパー部 170℃ ダイ部 180℃ 回転数 50rpm 射出成形条件： 温 度 ホツパー部 230℃ ノズル部 250℃ 金型部 65℃ 冷却時間 25秒 サイクル 40秒 （効果） 本願発明の組成物を用いると、容易にバンパーが成形で
きかつ、得られたバンパーはウレタンバンパー並の柔軟
性その他特性を有する。Impact energy measurement: Rheometrics, Drop Weight Tester-40 ° C, 11m /
sec Judgment of coatability: Urethane coating without primer treatment (Kansai Paint Retan PG-80) 60 x 15 minutes after baking, goggles eye test. ○ 100
% No peeling, △ 50% peeling Extrusion conditions: Temperature Hopper part 170 ℃ Die part 180 ℃ Rotation speed 50rpm Injection molding conditions: Temperature Hopper part 230 ℃ Nozzle part 250 ℃ Mold part 65 ℃ Cooling time 25 seconds Cycle 40 seconds (effect) Composition of the present invention By using, the bumper can be easily molded, and the obtained bumper has the flexibility and other characteristics comparable to those of the urethane bumper.
第１図は本願組成物を用いて成形した自動車用バンパー
の１例の斜視図である。 １……本体 ２……補強用リブFIG. 1 is a perspective view of an example of an automobile bumper formed by using the composition of the present invention. 1 ... Main body 2 ... Reinforcing rib
Claims (1)
重合体ブロツクＡを少なくとも２個、共役ジエン化合物
を主体とする重合体ブロツクＢを少なくとも２個有し、
重合体ブロツクＢの少なくとも１個は末端ブロツクであ
るブロツク共重合体に水素添加して得られる水素添加ブ
ロツク共重合体30〜40重量％ （２） ポリオレフイン30〜55重量％ （３） エチレン・プロピレンゴム40〜５重量％から成
り、室温での曲げ弾性率が2,000〜4,000Kg f/cm2のバン
パー用組成物。(1) At least two polymer blocks A mainly containing a vinyl aromatic compound and at least two polymer blocks B mainly containing a conjugated diene compound,
At least one of the polymer blocks B is a terminal block. Hydrogenated block copolymer obtained by hydrogenating a block copolymer 30-40% by weight (2) Polyolefin 30-55% by weight (3) Ethylene propylene A bumper composition comprising 40 to 5% by weight of rubber and having a bending elastic modulus at room temperature of 2,000 to 4,000 Kg f / cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61181909A JPH0689215B2 (en) | 1986-08-04 | 1986-08-04 | Bumper composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61181909A JPH0689215B2 (en) | 1986-08-04 | 1986-08-04 | Bumper composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6339950A JPS6339950A (en) | 1988-02-20 |
| JPH0689215B2 true JPH0689215B2 (en) | 1994-11-09 |
Family
ID=16109015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61181909A Expired - Lifetime JPH0689215B2 (en) | 1986-08-04 | 1986-08-04 | Bumper composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0689215B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100506756B1 (en) * | 2002-09-13 | 2005-08-08 | 현대자동차주식회사 | Composition for automobile interior materials with a high scratch-resistance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141233A (en) * | 1982-02-16 | 1983-08-22 | Asahi Chem Ind Co Ltd | Thermoplastic polymer composition |
| JPS6065044A (en) * | 1983-09-20 | 1985-04-13 | Asahi Chem Ind Co Ltd | Styrene polymer composition |
| JPS6114248A (en) * | 1984-06-30 | 1986-01-22 | Mitsubishi Petrochem Co Ltd | Thermoplastic resin composition |
| JPS61155446A (en) * | 1984-07-26 | 1986-07-15 | Asahi Chem Ind Co Ltd | Hydrogenated block copolymer composition |
-
1986
- 1986-08-04 JP JP61181909A patent/JPH0689215B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141233A (en) * | 1982-02-16 | 1983-08-22 | Asahi Chem Ind Co Ltd | Thermoplastic polymer composition |
| JPS6065044A (en) * | 1983-09-20 | 1985-04-13 | Asahi Chem Ind Co Ltd | Styrene polymer composition |
| JPS6114248A (en) * | 1984-06-30 | 1986-01-22 | Mitsubishi Petrochem Co Ltd | Thermoplastic resin composition |
| JPS61155446A (en) * | 1984-07-26 | 1986-07-15 | Asahi Chem Ind Co Ltd | Hydrogenated block copolymer composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6339950A (en) | 1988-02-20 |
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