JP3415071B2 - Composite molding method of ultra high molecular weight polyethylene and synthetic rubber - Google Patents
Composite molding method of ultra high molecular weight polyethylene and synthetic rubberInfo
- Publication number
- JP3415071B2 JP3415071B2 JP15847699A JP15847699A JP3415071B2 JP 3415071 B2 JP3415071 B2 JP 3415071B2 JP 15847699 A JP15847699 A JP 15847699A JP 15847699 A JP15847699 A JP 15847699A JP 3415071 B2 JP3415071 B2 JP 3415071B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- molecular weight
- weight polyethylene
- high molecular
- synthetic rubber
- 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 - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は、超高分子量ポリ
エチレンと合成ゴムとの接着を、射出成形機を用いて両
者を複合成形することにより行う方法に関する。
【０００２】
【従来の技術】ポリオレフィン系樹脂と合成ゴムとの接
着は、一般に加熱接着方法が用いられている。例えば、
特公昭６２−２４２４９号公報記載の「超高分子量ポリ
エチレンとゴムとの接着方法」がこれである。
【０００３】
【発明が解決しようとする課題】しかしながら、従来の
加熱接着方法では製品を得るのに３０分以上の長時間を
要するため、極めて生産性が低い欠点があった。又、接
着物はシート状のものに限られて、複雑な形状の製品が
得られない欠点があった。
【０００４】この発明が解決しようとする課題は、短時
間で接着を完了させるとともに、複雑な形状の製品を得
られるようにすることにある。
【０００５】
【課題を解決するための手段】この発明は、合成ゴムの
ポリマーにカーボンブラックと加硫剤とを配合して形成
したゴムパウンドを、ゴム金型内で加熱して半加硫状態
で成形したのち、射出成形金型内にインサートし、超高
分子量ポリエチレンを前記射出成形金型内に射出して圧
縮成形後、前記射出成形金型から取り出して加硫状態に
加温することを特徴とする。
【０００６】この発明で使用される超高分子量ポリエチ
レンは、通常分子量が１５０万〜６５０万程度で、融点
が約１２０℃〜約２３０℃である。
【０００７】この発明で用いられる合成ゴムは、まず半
加硫状態で成形される。即ち、天然ゴム、イソプレンゴ
ム、ブタジェンゴム、スチレンブタジェンゴム、アクリ
ロニトリルブタジェンゴム、エチレンプロピレンゴム、
クロロプレンゴム、ブチルゴム等のうちから選択される
天然ゴムを除く１のポリマー、或いは天然ゴムを含む２
〜３のブレンドポリマーに、カーボンブラックを配合し
てベースとする。
【０００８】このベースに、加硫剤として硫黄と有機過
酸化物のパーオキサイトとを併用し、ゴムパウンド作成
する。次いで前記ゴムパウンドを、ゴム金型内で１２０
℃〜１９０℃で加熱して半加硫状態のゴム成形品とす
る。半加硫状態はＴ１０〜Ｔ６０が最適であり、これよ
り低いとゴム形状が保持できなくなり、反対にこれより
高いと界面剥離がおきる。パーオキサイトは、ジ−ｔブ
チルパーオキサイド、ジクミルパーオキサイド、ｔ−ブ
チルパーオキシイソプロビルカーボネート等から選択す
ることができる。
【０００９】超高分子量ポリエチレンと半加硫状態の合
成ゴム成形品との複合成形は、次のようにして行われ
る。前記した半加硫状態のゴム成形品を射出成形機の射
出成形金型内にインサートして、金型温度を１００℃〜
１５０℃に維持しながら、超高分子量ポリエチレンを射
出成形温度１２０℃〜２３０℃、好ましくは１３０℃〜
２３０℃で射出成形機で射出して圧縮成形する。なお、
射出成形温度が２３５℃以上であれば、成形時に超高分
子量ポリエチレンが分解し、又合成ゴムとの接着面に気
体が発生して剥離しやすくなる。
【００１０】複合成形が完了すると金型から製品を取り
出し、オーブン、熱風乾燥機などの加熱装置で１００℃
〜１５０℃で加温して最適加硫状態にする。これら射
出、加圧、加温に要する成形時間は、約１８０秒〜３０
０秒である。なお成形時間は、製品の形状、厚み、大き
さ等に応じて、前記範囲内で変化する。
【００１１】
【実施例】融点１２０℃以上の超高分子量ポリエチレン
と合成ゴムとの複合成形を行う実施例について説明す
る。ゴムパウンドの配合（重量比）は次のとおりであ
る。
天然ゴム ７０部
ＳＢＲ ３０部
亜鉛華 ５部
ステアリン産 １部
カーボンブラック（Ｎ−２２） ９５部
プロセスオイル ２０部
老化防止剤 ２部
加硫促進剤 ２部
硫黄 ２部
パーオキサイド １．５部
なお、このパーオキサイドには、１．１−ビスｔ−ブチ
ルパーオキシン３３．５トリメチルシクロヘキサンを用
いるが、公知のパーオキサイド、例えば、ジ−ｔブチル
パーオキサイド、ジクミルパーオキサイド、ｔ−ブチル
パーオキシイソプロビルカーボネート等も使用できる。
【００１２】このゴムパウンドをゴム金型内で１２０℃
〜１９０℃で半加硫状態で成形したのち、射出成形金型
（油圧機構付き）内にインサートし、超高分子量ポリエ
チレンを射出成形温度１３０℃〜２３０℃、金型温度１
００℃〜１５０℃で射出圧縮成形する。成形が完了する
と射出成形金型から取り出し、オーブンで１００℃〜１
５０℃で再加硫する。
【００１３】
【発明の効果】超高分子量ポリエチレンと合成ゴムとの
複合成形が２分〜５分の短時間で行えるため、従来の接
着方法に比べて量産が可能になり、コストダウンの効果
が大である。
【００１４】射出成形金型を使用するので、複雑な形状
の製品を容易に得られる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding an ultra-high molecular weight polyethylene and a synthetic rubber by composite molding of both using an injection molding machine. 2. Description of the Related Art In general, a heat bonding method is used for bonding a polyolefin resin and a synthetic rubber. For example,
This is the "method of bonding ultra-high molecular weight polyethylene and rubber" described in JP-B-62-24249. However, the conventional heat bonding method requires a long time of 30 minutes or more to obtain a product, and thus has a disadvantage in that the productivity is extremely low. Further, the adhesive is limited to a sheet-like one, and there is a disadvantage that a product having a complicated shape cannot be obtained. An object of the present invention is to complete bonding in a short time and to obtain a product having a complicated shape. According to the present invention, a rubber compound formed by compounding a synthetic rubber polymer with carbon black and a vulcanizing agent is heated in a rubber mold to a semi-vulcanized state. After being molded in the injection molding die, ultra high molecular weight polyethylene is injected into the injection molding die, compression molded, taken out of the injection molding die and heated to a vulcanized state. Features. The ultrahigh molecular weight polyethylene used in the present invention usually has a molecular weight of about 1.5 to 6.5 million and a melting point of about 120 ° C. to about 230 ° C. The synthetic rubber used in the present invention is first molded in a semi-vulcanized state. That is, natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, ethylene propylene rubber,
1 polymer excluding natural rubber selected from chloroprene rubber, butyl rubber, etc., or 2 containing natural rubber
Carbon black is blended with the blend polymers of Nos. 1 to 3 as a base. [0008] A rubber compound is prepared by using sulfur and an organic peroxide as a vulcanizing agent in combination with the base. Next, the rubber compound is placed in a rubber mold for 120 minutes.
It is heated at a temperature of from 190C to 190C to obtain a semi-vulcanized rubber molded product. Semi-vulcanized state is optimal T 10 through T 60, which is lower than the rubber shape will not be able to hold a high interfacial peeling occurs than this in the opposite. The peroxide can be selected from di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxyisopropyl carbonate and the like. [0009] Composite molding of ultra-high molecular weight polyethylene and a semi-vulcanized synthetic rubber molded product is performed as follows. The above semi-vulcanized rubber molded product is inserted into an injection mold of an injection molding machine, and the mold temperature is set to 100 ° C or more.
While maintaining the temperature at 150 ° C, the ultra-high molecular weight polyethylene is injected at an injection molding temperature of 120 ° C to 230 ° C, preferably 130 ° C to
Injection is performed at 230 ° C. using an injection molding machine to perform compression molding. In addition,
If the injection molding temperature is 235 ° C. or higher, the ultra-high molecular weight polyethylene is decomposed during molding, and gas is generated on the surface to be bonded to the synthetic rubber, which makes it easy to peel off. When the composite molding is completed, the product is taken out of the mold and heated at 100 ° C. by a heating device such as an oven or a hot air dryer.
Heat to ~ 150 ° C to achieve optimal vulcanization. The molding time required for injection, pressurization and heating is about 180 seconds to 30 seconds.
0 seconds. The molding time varies within the above range according to the shape, thickness, size, etc. of the product. A description will be given of an embodiment in which composite molding of ultrahigh molecular weight polyethylene having a melting point of 120 ° C. or higher and synthetic rubber is performed. The compounding (weight ratio) of the rubber compound is as follows. Natural rubber 70 parts SBR 30 parts Zinc flower 5 parts Stearin produced 1 part Carbon black (N-22) 95 parts Process oil 20 parts Antioxidant 2 parts Vulcanization accelerator 2 parts Sulfur 2 parts Peroxide 1.5 parts As this peroxide, 1.1-bis-t-butylperoxin 33.5 trimethylcyclohexane is used, and known peroxides such as di-t-butyl peroxide, dicumyl peroxide, and t-butylperoxyisopro- Bill carbonate and the like can also be used. This rubber compound is placed in a rubber mold at 120 ° C.
After molding in a semi-vulcanized state at ~ 190 ° C, it is inserted into an injection mold (with a hydraulic mechanism), and ultra-high molecular weight polyethylene is injected at a temperature of 130 ° C to 230 ° C and a mold temperature of 1
Injection compression molding is performed at 00 ° C to 150 ° C. When the molding is completed, take it out of the injection mold and put it in an oven at 100 ° C ~ 1
Re-vulcanize at 50 ° C. The composite molding of ultrahigh molecular weight polyethylene and synthetic rubber can be performed in a short time of 2 to 5 minutes, so that mass production is possible as compared with the conventional bonding method, and the effect of cost reduction is achieved. Is big. Since an injection mold is used, a product having a complicated shape can be easily obtained.
Claims (1)
と加硫剤とを配合して形成したゴムパウンドを、ゴム金
型内で加熱して半加硫状態で成形したのち、射出成形金
型内にインサートし、超高分子量ポリエチレンを前記射
出成形金型内に射出して圧縮成形後、前記射出成形金型
から取り出して加硫状態に加温する超高分子量ポリエチ
レンと合成ゴムとの複合成形方法。(57) [Claims 1] A rubber compound formed by blending carbon black and a vulcanizing agent with a synthetic rubber polymer is heated in a rubber mold and molded in a semi-vulcanized state. After that, the ultra-high molecular weight polyethylene is inserted into the injection mold, the ultra-high molecular weight polyethylene is injected into the injection mold, compression molded, removed from the injection mold and heated to a vulcanized state. Composite molding method of rubber and synthetic rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847699A JP3415071B2 (en) | 1999-04-27 | 1999-04-27 | Composite molding method of ultra high molecular weight polyethylene and synthetic rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847699A JP3415071B2 (en) | 1999-04-27 | 1999-04-27 | Composite molding method of ultra high molecular weight polyethylene and synthetic rubber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000309034A JP2000309034A (en) | 2000-11-07 |
| JP3415071B2 true JP3415071B2 (en) | 2003-06-09 |
Family
ID=15672584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15847699A Expired - Fee Related JP3415071B2 (en) | 1999-04-27 | 1999-04-27 | Composite molding method of ultra high molecular weight polyethylene and synthetic rubber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3415071B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4236213B2 (en) * | 2007-05-02 | 2009-03-11 | 作新化成株式会社 | Compound molding method of ultra high molecular weight polyethylene and rubber |
-
1999
- 1999-04-27 JP JP15847699A patent/JP3415071B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000309034A (en) | 2000-11-07 |
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