JPH0422177B2 - - Google Patents
Info
- Publication number
- JPH0422177B2 JPH0422177B2 JP11009484A JP11009484A JPH0422177B2 JP H0422177 B2 JPH0422177 B2 JP H0422177B2 JP 11009484 A JP11009484 A JP 11009484A JP 11009484 A JP11009484 A JP 11009484A JP H0422177 B2 JPH0422177 B2 JP H0422177B2
- Authority
- JP
- Japan
- Prior art keywords
- molecular weight
- ultra
- high molecular
- parts
- weight polyethylene
- 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
Links
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 18
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 18
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000000344 soap Substances 0.000 claims description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 238000000465 moulding Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000001993 wax Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 125000001931 aliphatic group Chemical group 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
〔発明の技術分野〕
本発明は超高分子量ポリエチレンのもつ耐摩耗
性などを維持しつつ流れ性を付与し成形を容易に
した超高分子量ポリエチレン組成物に関する。
〔従来技術〕
超高分子量ポリエチレンはその平均分子量が
100万以上であり、現在では平均分子量が600万の
樹脂も製造されている。このような超高分子量ポ
リエチレンは高硬度を有し、耐摩耗性に優れてい
る。しかし、分子間凝集力が強いために流れ性が
悪く、成形が非常に困難なので、一般には、加圧
高温下で成型が行なわれているが特殊な形状の樹
脂を必要とする場合には、切削による加工が行な
われているため製品が安価に供給されない。又上
記の加圧プレス法に加えて、ラム押出や１軸、２
軸の特殊装置による押出成形も誠みられているが
生産性が悪くコスト的にはプレス切削方式と同程
度となり実用性に乏しい。特開昭51−90360号公
報には混練・成形過程におけるスクリユーが開示
されている。しかし、この開示技術によつても、
樹脂の流れ性が本質的に改善されることはなく、
成形機での溶融樹脂の流動性が依然として悪いた
めに少量ずつゆつくりとしか成形することができ
ず生産性が悪くコスト高となる。そのうえ、この
樹脂の成形には、上記の加圧プレス法や押出法と
同様に240〜250℃の高温が必要であるため樹脂の
熱分解が起こり分子量が低下するので耐摩耗性が
低下する。さらに特開昭58−59243号公報には脂
肪族環式炭化水素重合体を30％前後添加して成形
を容易にした例が開示されている。添加物により
樹脂が希釈されて流れ性がやや改善されるものの
なお充分ではないため、この方式による成形は押
出成形機など特定の成形装置にしか適用されえな
いし、超高分子量ポリエチレン自体の濃度が薄く
なるため、耐薬品性、耐摩耗性が低下する。
〔発明の目的〕
本発明の目的は、超高分子量ポリエチレンの耐
摩耗性・耐薬品性を低下させることなく流れ性を
もたせて成形易易とした超高分子量ポリエチレン
組成物を提供することにある。
〔発明の構成〕
本発明の要旨な、平均分子量100万以上の超高
分子量ポリエチレン100重量部と、スチレンオリ
ゴマー３〜10重量部と、炭化水素系ワツクス又は
脂肪酸金属石けん0.5〜５重量部よりなる超高分
子量ポリエチレン組成物に存する。
本発明で使用されるスチレンオリゴマーはスチ
レンの低重合体であつて、平均分子量が300〜
5000のものが好適に使用され、平均分子量100万
以上の超高分子量ポリエチレン100重量部に対し
３〜10重量部添加される。
本発明で使用されるワツクスは炭化水素系のも
のであつて、たとえばパラフインワツクス、マイ
クロワツクス、ポリエチレンワツクス等があげら
れ、融点が100〜120℃のものが好適に使用され
る。
又脂肪族金属石けんとしては、たとえばステア
リン酸、モンタン酸などの有機カルボン酸のマグ
ネシウム、カルシウム、ストロンチウム、バリウ
ム、亜鉛、カドミウム、鉛などの金属の塩があげ
られる。
上記炭化水素系ワツクス又は脂肪族金属石けん
は超高分子量ポリエチレン100重量部に対し、0.5
〜５重量部添加されるのであり、好ましくは１〜
３重量部である。
〔発明の効果〕
本発明の超高分子量ポリエチレン組成物の構成
は上述の通りであり、平均分子量100万以上の超
高分子量ポリエチレンにスチレンオリゴマーと炭
化水素系ワツクス又は脂肪族金属石けんが添加さ
れているので、超高分子量ポリエチレンのもつ耐
摩耗性などのすぐれた性質を損なうことなく流れ
性を向上させることができその結果成形を容易に
行なうことができる。このため成形品の生産性が
向上し、低価格で成形品を供給することができ
る。
〔実施例〕
次に本発明の実施例を説明する。
実施例１〜３、比較例１〜３平均分子量200万
の超高分子量ポリエチレン、平均分子量300のス
チレンオリゴマー（エクソンケミカル社製、ピコ
ラスチツク300）及び炭化水素系ワツクス（三井
石油化学社製、ハイワツクス220MP）よりなり、
第１表に示した組成の配合物をスパーミキサーに
供給し、常温〜80℃の範囲で15分間混合して混合
物を得た。得られた混合物を直径40cmの２軸押出
機（Ｌ／D26.6）に供給し、幅15cm、厚さ1.0mmの
シートを得た。押出機のスクリユー先端部を260
℃に設定し押出し速度（押出口の線速度）を測定
した。又得られたシートの耐摩耗性を測定し、結
果を第１表に示した。耐摩耗性は厚さ1.0mm、巾
５cm、長さ７cmの試料シートにノズルから噴射す
る100メツシユの鋳物砂を垂直に３分間あて、シ
ート100ｇあたりの摩耗量を測定した。
[Technical Field of the Invention] The present invention relates to an ultra-high molecular weight polyethylene composition that maintains the wear resistance of ultra-high molecular weight polyethylene while imparting flowability and facilitating molding. [Prior art] Ultra-high molecular weight polyethylene has an average molecular weight of
It is more than 1 million, and resins with an average molecular weight of 6 million are currently being manufactured. Such ultra-high molecular weight polyethylene has high hardness and excellent wear resistance. However, due to strong intermolecular cohesive forces, flowability is poor and molding is extremely difficult.Generally, molding is performed under pressure and high temperature, but when a special shape of resin is required, Since processing is performed by cutting, products cannot be supplied at low prices. In addition to the above-mentioned pressure press method, ram extrusion, single screw, double screw
Extrusion molding using special equipment for the shaft has been tried, but productivity is poor and the cost is comparable to press cutting, making it impractical. JP-A-51-90360 discloses a screw in the kneading and molding process. However, even with this disclosure technology,
There is no substantial improvement in the flowability of the resin.
Because the fluidity of the molten resin in the molding machine is still poor, it is only possible to mold it slowly in small quantities, resulting in poor productivity and high costs. Furthermore, molding of this resin requires a high temperature of 240 to 250° C., similar to the above-mentioned pressure pressing method or extrusion method, which causes thermal decomposition of the resin, resulting in a decrease in molecular weight and a decrease in wear resistance. Further, JP-A-58-59243 discloses an example in which approximately 30% of an aliphatic cyclic hydrocarbon polymer is added to facilitate molding. Although the additive dilutes the resin and improves the flowability slightly, it is still not sufficient, so molding using this method can only be applied to specific molding equipment such as extrusion molding machines, and the concentration of the ultra-high molecular weight polyethylene itself As it becomes thinner, chemical resistance and abrasion resistance decrease. [Object of the Invention] An object of the present invention is to provide an ultra-high molecular weight polyethylene composition that has flowability and is easily molded without reducing the abrasion resistance and chemical resistance of the ultra-high molecular weight polyethylene. . [Structure of the Invention] The gist of the present invention consists of 100 parts by weight of ultra-high molecular weight polyethylene with an average molecular weight of 1 million or more, 3 to 10 parts by weight of styrene oligomer, and 0.5 to 5 parts by weight of hydrocarbon wax or fatty acid metal soap. Ultra-high molecular weight polyethylene composition. The styrene oligomer used in the present invention is a low polymer of styrene, and has an average molecular weight of 300 to 300.
5000 is preferably used, and is added in an amount of 3 to 10 parts by weight per 100 parts by weight of ultra-high molecular weight polyethylene having an average molecular weight of 1 million or more. The wax used in the present invention is a hydrocarbon wax, such as paraffin wax, micro wax, polyethylene wax, etc., and those having a melting point of 100 to 120°C are preferably used. Examples of aliphatic metal soaps include salts of organic carboxylic acids such as stearic acid and montanic acid with metals such as magnesium, calcium, strontium, barium, zinc, cadmium, and lead. The above hydrocarbon wax or aliphatic metal soap is 0.5 parts by weight per 100 parts by weight of ultra-high molecular weight polyethylene.
~5 parts by weight is added, preferably 1~5 parts by weight.
It is 3 parts by weight. [Effects of the Invention] The composition of the ultra-high molecular weight polyethylene composition of the present invention is as described above, in which a styrene oligomer and a hydrocarbon wax or an aliphatic metal soap are added to ultra-high molecular weight polyethylene with an average molecular weight of 1 million or more. Therefore, the flowability can be improved without impairing the excellent properties of ultra-high molecular weight polyethylene such as abrasion resistance, and as a result, molding can be performed easily. Therefore, the productivity of molded products is improved, and molded products can be supplied at low prices. [Example] Next, an example of the present invention will be described. Examples 1 to 3, Comparative Examples 1 to 3 Ultra-high molecular weight polyethylene with an average molecular weight of 2 million, styrene oligomer with an average molecular weight of 300 (manufactured by Exxon Chemical Co., Ltd., Picolastic 300), and hydrocarbon wax (manufactured by Mitsui Petrochemical Company, Ltd., Hiwax 220MP) ),
A mixture having the composition shown in Table 1 was supplied to a spar mixer and mixed for 15 minutes at a temperature ranging from room temperature to 80°C to obtain a mixture. The obtained mixture was fed to a twin-screw extruder (L/D 26.6) with a diameter of 40 cm to obtain a sheet with a width of 15 cm and a thickness of 1.0 mm. Set the extruder screw tip to 260 mm.
The extrusion speed (linear speed of the extrusion port) was measured. The abrasion resistance of the obtained sheet was also measured and the results are shown in Table 1. Abrasion resistance was measured by applying 100 meshes of foundry sand vertically from a nozzle to a sample sheet 1.0 mm thick, 5 cm wide, and 7 cm long for 3 minutes, and measuring the amount of wear per 100 g of the sheet.
【表】
実施例４〜６、比較例４〜７
平均分子量600万の超高分子量ポリエチレン、
平均分子量300、1000及び5000のスチレンオリゴ
マー（エクソンケミカル社製、ピコラスチツク
300、1000及び5000）及びステアリン酸カルシウ
ムよりなり、第２表に示した組成の配合物を用
い、実施例１で行つたと同様にして混合物を得、
押出機で押出した。押出し速度と摩耗量を測定し
第２表に示した。[Table] Examples 4 to 6, Comparative Examples 4 to 7 Ultra-high molecular weight polyethylene with an average molecular weight of 6 million,
Styrene oligomers with average molecular weights of 300, 1000, and 5000 (manufactured by Exxon Chemical Co., Ltd., Picolastic)
300, 1000 and 5000) and calcium stearate and having the composition shown in Table 2, a mixture was obtained in the same manner as in Example 1,
Extruded using an extruder. The extrusion speed and amount of wear were measured and shown in Table 2.
Claims (1)
レン100重量部と、スチレンオリゴマー３〜10重
量部と、炭化水素系ワツクス又は脂肪酸金属石け
ん0.5〜５重量部よりなる超高分子量ポリエチレ
ン組成物。1. An ultra-high molecular weight polyethylene composition comprising 100 parts by weight of ultra-high molecular weight polyethylene with an average molecular weight of 1 million or more, 3 to 10 parts by weight of styrene oligomer, and 0.5 to 5 parts by weight of a hydrocarbon wax or fatty acid metal soap.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11009484A JPS60252645A (en) | 1984-05-30 | 1984-05-30 | Ultra-high molecular weight polyethylene composition |
| CA000464500A CA1247772A (en) | 1983-10-07 | 1984-10-02 | Ultrahigh-molecular-weight polyethylene composition |
| DE8484111981T DE3479811D1 (en) | 1983-10-07 | 1984-10-05 | Ultrahigh-molecular-weight polyethylene composition |
| EP84111981A EP0146704B1 (en) | 1983-10-07 | 1984-10-05 | Ultrahigh-molecular-weight polyethylene composition |
| US07/377,158 US4952625A (en) | 1983-10-07 | 1989-07-10 | Process for improving the flowability of ultrahigh-molecular-weight polyethylene composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11009484A JPS60252645A (en) | 1984-05-30 | 1984-05-30 | Ultra-high molecular weight polyethylene composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60252645A JPS60252645A (en) | 1985-12-13 |
| JPH0422177B2 true JPH0422177B2 (en) | 1992-04-15 |
Family
ID=14526873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11009484A Granted JPS60252645A (en) | 1983-10-07 | 1984-05-30 | Ultra-high molecular weight polyethylene composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60252645A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7214764B2 (en) | 2003-06-30 | 2007-05-08 | Depuy Products, Inc. | Free radical quench process for irradiated ultrahigh molecular weight polyethylene |
| US7335697B2 (en) | 2004-12-23 | 2008-02-26 | Depuy Products, Inc. | Polymer composition comprising cross-linked polyethylene and methods for making the same |
| US8343230B2 (en) | 2005-09-22 | 2013-01-01 | Depuy Products, Inc. | Orthopaedic bearing material |
| US7812098B2 (en) | 2006-03-31 | 2010-10-12 | Depuy Products, Inc. | Bearing material of medical implant having reduced wear rate and method for reducing wear rate |
| ES2350708T3 (en) | 2006-08-25 | 2011-01-26 | Depuy Products, Inc. | MEDICAL IMPLANT SUPPORT MATERIAL. |
-
1984
- 1984-05-30 JP JP11009484A patent/JPS60252645A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60252645A (en) | 1985-12-13 |
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