JP2007284608A - Nonadhesive/low friction fluororubber composition - Google Patents
Nonadhesive/low friction fluororubber composition Download PDFInfo
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Abstract
Description
本発明は非粘着性・低摩擦性フッ素ゴム組成物に関する。 The present invention relates to a non-adhesive and low-friction fluororubber composition.
フッ素ゴムは圧縮永久歪性、耐熱性、耐薬品性が良好で、種々の分野で用いられており、ハードディスクのディスクドライバーを覆うガスケットあるいはプリント配線シールに用いられるシールコネクタ、Ｏ−リング等のシール材、自動車用部品などの用途が知られている。 Fluororubber has good compression set, heat resistance, and chemical resistance, and is used in various fields. Seals such as gaskets that cover hard disk disk drivers or printed wiring seals, seals such as O-rings Applications such as materials and automotive parts are known.
フッ素ゴムは、一般に架橋時にフッ素ゴム表面にカルボニル基が酸化反応によって生じ、このため粘着性が大きいという欠点がある。このため、たとえばバルブのシール材などに使用する場合には、ゴム表面に結合力を抑制する表面処理（非粘着層を形成する）を行なうのが一般的である。 Fluoro rubber generally has a drawback that a carbonyl group is generated on the surface of the fluoro rubber by an oxidation reaction at the time of crosslinking. For this reason, when used, for example, as a sealing material for a valve, surface treatment (forming a non-adhesive layer) that suppresses the bonding force on the rubber surface is generally performed.
しかしながら、このような表面処理は、耐久性の観点で欠点がある。
本発明は上述の欠点を解決することを課題とする。すなわちフッ素ゴム単独の非粘着性、低摩擦性のフッ素ゴム組成物を提供することを課題としている。 An object of the present invention is to solve the above-mentioned drawbacks. That is, it is an object to provide a non-adhesive, low-friction fluororubber composition composed of fluororubber alone.
上記課題を解決するため、本発明による非粘着性・低摩擦性フッ素ゴム組成物は、３元系フッ素ゴム１００重量部に対し、受酸剤として、酸化亜鉛２〜１０重量部および酸化マグネシウム１〜５重量部を配合したことを特徴とする。 In order to solve the above-mentioned problems, the non-adhesive and low-friction fluororubber composition according to the present invention comprises 2 to 10 parts by weight of zinc oxide and magnesium oxide 1 as an acid acceptor with respect to 100 parts by weight of the ternary fluororubber. It is characterized by blending ˜5 parts by weight.
本発明の非粘着性・低摩擦性フッ素ゴム組成物によれば、上述のようなフッ素ゴムは、粘着性及び摩擦係数を低減できるという利点を生じる。 According to the non-adhesive / low-friction fluororubber composition of the present invention, the above-described fluororubber has the advantage that the tackiness and friction coefficient can be reduced.
本発明による非粘着性・低摩擦性フッ素ゴム組成物は、前述のように３元系フッ素ゴム１００重量部に対し、受酸剤として、酸化亜鉛２〜１０重量部および酸化マグネシウム１〜５重量部を配合したことを特徴としている。 As described above, the non-adhesive and low-friction fluororubber composition according to the present invention comprises 2 to 10 parts by weight of zinc oxide and 1 to 5 parts by weight of magnesium oxide as an acid acceptor with respect to 100 parts by weight of the ternary fluororubber. It is characterized by blending parts.
本発明による３元系フッ素ゴムとしては、たとえばフッ化ビニリデン−６フッ化プロピレン−４フッ化エチレン等を挙げることができ、ポリオール架橋のものが好ましい。３元系フッ素ゴムは圧縮永久歪性、耐熱性、耐薬品性が優れており、Ｏ−リングなどのシール材として最適である。 Examples of the ternary fluororubber according to the present invention include vinylidene fluoride-6-propylene-propylene-tetrafluoroethylene, and polyol-crosslinked ones are preferred. Ternary fluororubber is excellent in compression set, heat resistance, and chemical resistance, and is optimal as a sealing material for O-rings and the like.
本発明においては、受酸剤として酸化亜鉛と酸化マグネシウムを配合している。受酸剤はポリオール架橋時に発生するフッ化水素を吸収するために使用され、ポリオール架橋の場合には必須の成分である。従来はこのような受酸剤として、水酸化カルシウムと酸化マグネシウムを使用していた。本発明においては水酸化カルシウムに代わって酸化亜鉛を使用している。 In the present invention, zinc oxide and magnesium oxide are blended as acid acceptors. The acid acceptor is used to absorb hydrogen fluoride generated during polyol crosslinking, and is an essential component in the case of polyol crosslinking. Conventionally, calcium hydroxide and magnesium oxide have been used as such acid acceptors. In the present invention, zinc oxide is used in place of calcium hydroxide.
このような酸化亜鉛はフッ素ゴム１００重量部に対して、２〜１０重量部添加される。この範囲を逸脱すると非粘着性及び摩擦係数の低減が実現できない恐れがある。好ましくは４〜８重量部である。 Such zinc oxide is added in an amount of 2 to 10 parts by weight with respect to 100 parts by weight of the fluororubber. If it deviates from this range, there is a possibility that reduction of non-adhesiveness and friction coefficient cannot be realized. Preferably it is 4-8 weight part.
この酸化亜鉛とともに使用される酸化マグネシウムは、フッ素ゴム１００重量部に対し１〜５重量部、好ましくは２〜４重量部、さらに好ましくは３重量部前後である。酸化マグネシウムは酸化亜鉛と協働して非粘着性の改善及び摩擦係数の低減を行うが、この範囲を逸脱すると、同様に非粘着性及び摩擦係数の低減が実現できない恐れがある。 The magnesium oxide used together with this zinc oxide is 1 to 5 parts by weight, preferably 2 to 4 parts by weight, and more preferably around 3 parts by weight with respect to 100 parts by weight of the fluororubber. Magnesium oxide cooperates with zinc oxide to improve non-stickiness and reduce the coefficient of friction, but if it deviates from this range, there is a possibility that non-stickiness and reduction of the coefficient of friction cannot be realized.
本発明による非粘着性・低摩擦性フッ素ゴム組成物は、好ましくは芳香族ポリオールなどのようなポリオール系加硫剤を含み、さらに従来この種のフッ素ゴムに含まれる配合剤を配合することが可能である。たとえば４級オニウム塩などの加硫促進剤、高級脂肪酸類、天然ワックス類などの加工助剤（フッ素ゴム１００重量部に対し２重量部以下）、カーボンブラック、硫酸バリウム、シリカ、珪藻土、タルクなどの充填剤（フッ素ゴム１００重量部に対し６０重量部以下）、滑剤などを添加することができる。 The non-adhesive and low-friction fluororubber composition according to the present invention preferably contains a polyol vulcanizing agent such as an aromatic polyol, and further contains a compounding agent conventionally contained in this type of fluororubber. Is possible. For example, vulcanization accelerators such as quaternary onium salts, processing aids such as higher fatty acids and natural waxes (2 parts by weight or less per 100 parts by weight of fluororubber), carbon black, barium sulfate, silica, diatomaceous earth, talc, etc. Filler (60 parts by weight or less with respect to 100 parts by weight of fluororubber), a lubricant and the like can be added.
実施例１
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
酸化亜鉛 ６重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
実施例２
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
酸化亜鉛 ４重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
実施例３
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
酸化亜鉛 ８重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
比較例１
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
水酸化カルシウム ６重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
比較例２
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
水酸化カルシウム ４重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
比較例３
フッ素ゴム（ダイエル Ｇ−６７１；商標名） １００重量部
水酸化カルシウム ８重量部
酸化マグネシウム ３重量部
カーボンブラック（Ｎ９９０；商標名） ５重量部
滑剤（ストラクトールＷＳ２８０；商標名） ０．３重量部
上述のダイエル Ｇ−６７１中には、ポリオール系架橋剤が含まれている。上記の配合のフッ素ゴム組成物を一次加硫１８０℃、１０分、二次加硫２３０℃、１６時間行って架橋させ、フッ素ゴムを製造した。このようなフッ素ゴムの物性を測定した結果を、下記の表１に示す。
表１
Example 1
Fluoro rubber (Daiel G-671; trade name) 100 parts by weight Zinc oxide 6 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
Example 2
Fluoro rubber (Daiel G-671; trade name) 100 parts by weight Zinc oxide 4 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
Example 3
Fluororubber (Daiel G-671; trade name) 100 parts by weight Zinc oxide 8 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
Comparative Example 1
Fluororubber (Daiel G-671; trade name) 100 parts by weight Calcium hydroxide 6 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
Comparative Example 2
Fluororubber (Daiel G-671; trade name) 100 parts by weight Calcium hydroxide 4 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
Comparative Example 3
Fluororubber (Daiel G-671; trade name) 100 parts by weight Calcium hydroxide 8 parts by weight Magnesium oxide 3 parts by weight Carbon black (N990; trade name) 5 parts by weight Lubricant (Strectol WS280; trade name) 0.3 parts by weight
The above-mentioned Daiel G-671 contains a polyol-based crosslinking agent. The fluororubber composition having the above composition was subjected to crosslinking by performing primary vulcanization at 180 ° C. for 10 minutes and secondary vulcanization at 230 ° C. for 16 hours to produce fluororubber. The results of measuring the physical properties of such fluororubber are shown in Table 1 below.
Table 1
結果を図１に示す。図１より明らかなように、本発明によるフッ素ゴムは、比較例１に比較して１／６程度低くなっており、著しく改良された。 The results are shown in FIG. As is clear from FIG. 1, the fluororubber according to the present invention is about 1/6 lower than that of Comparative Example 1 and is remarkably improved.
次に、実施例２，実施例３，比較例２及び比較例３として上記の組成のフッ素ゴム組成物を作製し、実施例１と同様な条件で加硫してフッ素ゴムを製造した。 Next, fluororubber compositions having the above compositions were prepared as Example 2, Example 3, Comparative Example 2 and Comparative Example 3, and vulcanized under the same conditions as in Example 1 to produce fluororubber.
上述の実施例１から３及び比較例１から３の試料片を使用して張り付き状態を測定した。 The sticking state was measured using the sample pieces of Examples 1 to 3 and Comparative Examples 1 to 3 described above.
測定法は、株式会社レスカ製のタッキング試験機ＴＡＣ−ＩＩを使用して行った。すなわち、試料ゴム片を１００ｇｆの荷重で荷重時間３秒間押し付け、６００ｍｍ／分の速度で引き離した。試料の厚さは２ｍｍ、測定時の温度は２３℃であった。試料数は５個である。結果を下記の表２及び表３に示す。
表２
The measurement method was performed using a tacking tester TAC-II manufactured by Reska Co., Ltd. That is, the sample rubber piece was pressed at a load of 100 gf for a load time of 3 seconds and separated at a speed of 600 mm / min. The thickness of the sample was 2 mm, and the measurement temperature was 23 ° C. The number of samples is five. The results are shown in Tables 2 and 3 below.
Table 2
本発明の非粘着性・低摩擦性フッ素ゴム組成物によれば、上述のようなフッ素ゴムの特性を損なうことなく、粘着性及び摩擦係数を低減できるという利点を生じる。特に摺動用のＯ−リングに最適に使用できる。 According to the non-adhesive / low-friction fluororubber composition of the present invention, there is an advantage that the adhesiveness and the friction coefficient can be reduced without impairing the characteristics of the fluororubber as described above. In particular, it can be used optimally for sliding O-rings.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009113193A1 (en) | 2008-03-11 | 2009-09-17 | Nok株式会社 | Process for producing rotating/sliding seal and rotating/sliding seal |
| JP2013007355A (en) * | 2011-06-27 | 2013-01-10 | Fujikura Rubber Ltd | Heater unit with ptc heater and manufacturing method thereof |
| WO2013123156A1 (en) | 2012-02-15 | 2013-08-22 | 3M Innovative Properties Company | Fluoropolymer composition comprising a cross - linkable fluorinated elastomer and a ptfe of low melting point |
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| JP2007169512A (en) * | 2005-12-22 | 2007-07-05 | Nok Corp | Rubber composition and method for producing crosslinked fluororubber |
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| JPH04108845A (en) * | 1989-12-06 | 1992-04-09 | E I Du Pont De Nemours & Co | Improved fluorinated thermoplastic elastomer containing polymeric additive and method of manufacturing elastomer of this kind |
| JPH0693125A (en) * | 1992-05-29 | 1994-04-05 | Ausimont Spa | Composition based on elastomeric polymer made from vinylidene fluoride, hexafluoropropene, and, if desired, tetrafluoroethylene and suitable for producing microporous foam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009113193A1 (en) | 2008-03-11 | 2009-09-17 | Nok株式会社 | Process for producing rotating/sliding seal and rotating/sliding seal |
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| JP2013007355A (en) * | 2011-06-27 | 2013-01-10 | Fujikura Rubber Ltd | Heater unit with ptc heater and manufacturing method thereof |
| WO2013123156A1 (en) | 2012-02-15 | 2013-08-22 | 3M Innovative Properties Company | Fluoropolymer composition comprising a cross - linkable fluorinated elastomer and a ptfe of low melting point |
| US9458314B2 (en) | 2012-02-15 | 2016-10-04 | 3M Innovative Properties Company | Fluoropolymer composition |
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