JP2965721B2 - Low hardness fluoro rubber vulcanizing composition - Google Patents

Low hardness fluoro rubber vulcanizing composition

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Publication number
JP2965721B2
JP2965721B2 JP3021891A JP3021891A JP2965721B2 JP 2965721 B2 JP2965721 B2 JP 2965721B2 JP 3021891 A JP3021891 A JP 3021891A JP 3021891 A JP3021891 A JP 3021891A JP 2965721 B2 JP2965721 B2 JP 2965721B2
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JP
Japan
Prior art keywords
weight
unit
fluororubber
less
present
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
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JP3021891A
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Japanese (ja)
Other versions
JPH04268357A (en
Inventor
文夫 菅野
廣 斉藤
圭一 戸田
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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Filing date
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Priority to JP3021891A priority Critical patent/JP2965721B2/en
Publication of JPH04268357A publication Critical patent/JPH04268357A/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明はフッ素ゴムの新規な加硫
組成物に関するものである。さらに詳しくいえば、本発
明は混練作業性及び加硫成形品の歩留まりの悪化を招か
ずにフッ素ゴム加硫物の優れた耐熱性、耐油性、耐圧縮
永久ひずみ性などを維持しつつ低硬度を達成したフッ素
ゴム加硫組成物に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel vulcanized composition of fluoro rubber. More specifically, the present invention provides a low hardness while maintaining excellent heat resistance, oil resistance, compression set resistance and the like of the vulcanized fluoro rubber without deteriorating the kneading workability and the yield of the vulcanized molded product. The present invention relates to a vulcanized fluororubber composition which achieves the above.

【0002】[0002]

【従来の技術】フッ素ゴム加硫物は、優れた耐熱性、耐
油性、耐圧縮永久ひずみ性などを有していることから、
各種の工業分野、例えば自動車、OA機器、船舶、航空
機、油圧機器、一般機械工業、公害関連部門などにおい
て、O−リング、ガスケット、オイルシール、ダイヤフ
ラム、ホース、ロール、シート材などに用いられてい
る。しかしながら、防振ゴム用途並びに弱い締め付け力
でシール性を要求されようなシール部品用途では硬度を
低くする必要があるが、硬度50゜(スプリング式硬度
JIS−A形)以下で実用性能を満足するものはない。
2. Description of the Related Art Fluorine rubber vulcanizates have excellent heat resistance, oil resistance, compression set resistance and the like.
Used for O-rings, gaskets, oil seals, diaphragms, hoses, rolls, sheet materials, etc. in various industrial fields such as automobiles, OA equipment, ships, aircraft, hydraulic equipment, general machinery industries, and pollution-related departments. I have. However, it is necessary to lower the hardness in applications such as vibration-proof rubber and sealing parts where sealing performance is required with a weak tightening force. However, practical performance is satisfied at a hardness of 50 ° (spring type JIS-A type) or less. There is nothing.

【0003】これまでにフッ素ゴム加硫物の低硬度化の
検討が種々行われている。改良方法の具体例としては、
低分子量の液状フッ素ゴムをブレンドする方法、フッ素
系オイル、フッ素化シリコンオイルを添加するなどの方
法が報告されている。具体的にはフッ素ゴムにフッ素化
ポリアミドや重合体過フッ素化ポリエーテルを添加する
方法(公告平1−29819号、公告平3−2382
号)が挙げられる。
[0003] Various studies have been made to reduce the hardness of vulcanizates of fluororubbers. As a specific example of the improvement method,
A method of blending a low molecular weight liquid fluororubber, a method of adding a fluorinated oil, and a fluorinated silicone oil have been reported. Specifically, a method of adding a fluorinated polyamide or a polymer perfluorinated polyether to a fluororubber (publication No. 1-29819, publication 3-2382)
No.).

【0004】しかし、何れの方法でも硬度50゜以下を
達成するためにはフッ素ゴムに対して多量の液状フッ素
ゴム、フッ素系オイル、フッ素化シリコンオイルを添加
しなければならず、混練性作業性の悪化、架橋密度不足
による成形品の発泡、加硫成形品の破断強度の大幅な低
下、耐溶剤性の悪化などを招き満足できるものではなか
った。
However, in order to achieve a hardness of 50 ° or less by any of the methods, a large amount of liquid fluororubber, fluorine-based oil and fluorinated silicon oil must be added to the fluororubber. Of the molded product due to insufficient cross-linking density, drastic reduction in the breaking strength of the vulcanized molded product, deterioration of the solvent resistance, etc., were not satisfactory.

【0005】[0005]

【発明が解決しようとする課題】本発明の目的は、混練
作業性及び加硫成形品の歩留まりの悪化、加硫成形品の
破断強度低下を招かずに従来のフッ素ゴム加硫物と同様
に耐熱性、耐油性、耐圧縮永久ひずみ性に優れた加硫物
特性を維持しつつ、硬さ50゜以下の低硬度を達成した
フッ素ゴム加硫組成物を提供することにある。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method similar to that of a conventional vulcanized rubber vulcanizate without deteriorating the workability of kneading, the yield of the vulcanized molded product, and reducing the breaking strength of the vulcanized molded product. It is an object of the present invention to provide a vulcanized fluororubber composition which achieves a low hardness of 50 ° or less while maintaining vulcanizates having excellent heat resistance, oil resistance and compression set resistance.

【0006】[0006]

【課題を解決するための手段】本発明者らは鋭意研究を
重ねた結果、特定のフッ素ゴムを使用する加硫組成物
が前記目的に適合することを見出し、この知見に基づい
て本発明を完成するに至った。すなわち、本発明は
(a)フッ化ビニリデン単位とヘキサフルオロプロピレ
ン単位、又はフッ化ビニリデン単位とヘキサフルオロプ
ロピレン単位と35重量%以下のテトラフルオロエチレ
ン単位から成り、極限粘度数(以下、[η]と称する)
が50〜200ml/gであり、分子量分布がモノモダ
ルであって分子量5万以下の成分比(以下、Mと称
す)が20〜70%かつ分子量100万以上の成分比
(以下、M100と称す)が2〜30%であるフッ素ゴ
ム、(b)架橋剤、(c)加硫促進剤、及び(d)二価
金属酸化物又は二価金属水酸化物又はそれらの混合物か
ら成ることを特徴とする50゜以下(JIS−A)の低
硬度フッ素ゴム加硫物を与える加硫性組成物を提供する
ものである。
The present inventors have SUMMARY OF THE INVENTION As a result of extensive research, found that vulcanization composition using a specific fluorine rubber to conform to the object, the present invention based on this finding Was completed. That is, the present invention comprises (a) a vinylidene fluoride unit and a hexafluoropropylene unit, or a vinylidene fluoride unit, a hexafluoropropylene unit, and 35% by weight or less of a tetrafluoroethylene unit, and has an intrinsic viscosity (hereinafter referred to as [η]). Is called)
There was 50~200ml / g, molecular weight 50,000 following component ratio molecular weight distribution a monomodal (hereinafter, referred to as M 5) 20 to 70% and a molecular weight of 1,000,000 or more component ratio (hereinafter, an M 100 fluororubber referred) is 2 to 30% in that it consists of (b) crosslinking agent, (c) a vulcanization accelerator, and (d) divalent metal oxide or divalent metal hydroxide or mixtures thereof Low characteristic of 50 ° or less (JIS-A)
There is provided a vulcanizable composition which gives hardness fluororubber vulcanized product.

【0007】本発明の(a)成分として用いるフッ素ゴ
ムを「構成するモノマー単位」、〔η〕、「分子量分
布」について詳細に説明する。本発明の(a)成分とし
て用いるフッ素ゴムを「構成するモノマー単位」は
(イ)フッ化ビニリデン単位と(ロ)ヘキサフルオロプ
ロピレン単位、又は(イ)単位と(ロ)単位と(イ)、
(ロ)、(ハ)単位の合計重量中35重量%以下の
(ハ)テトラフルオロエチレン単位から成る。(イ)、
(ロ)、(ハ)の3元からなるフッ素ゴムの場合は
(イ)単位と(ロ)単位の重量比は40:60ないし8
0:20好ましくは45:55ないし70:30、より
好ましくは50:50ないし60:40である。(イ)
単位がこの範囲にあるのは40重量%より少ないと重合
速度が極めて遅く、かつ高分子量のものが得られ難くな
る傾向、また、80重量%より多いと得られるフッ素ゴ
ムは樹脂状となりゴム弾性が低下する傾向があるためで
ある。
The "constituent monomer unit", [η], and "molecular weight distribution" of the fluororubber used as the component (a) of the present invention will be described in detail. The “monomer unit constituting” the fluororubber used as the component (a) of the present invention includes (a) a vinylidene fluoride unit and a (b) hexafluoropropylene unit, or (a) a unit, a (b) unit, and (a);
It is composed of (c) tetrafluoroethylene units in an amount of 35% by weight or less based on the total weight of (b) and (c) units. (I),
In the case of the fluorinated rubber composed of the ternary system (b) and (c), the weight ratio of the unit (a) to the unit (b) is from 40:60 to 8
0:20, preferably 45:55 to 70:30, more preferably 50:50 to 60:40. (I)
When the unit is less than 40% by weight, the polymerization rate is extremely slow when the amount is less than 40% by weight, and it tends to be difficult to obtain a polymer having a high molecular weight. Is likely to decrease.

【0008】(ハ)単位を含む3元系フッ素ゴムにおい
ては(ハ)単位の含有量は(イ)、(ロ)、(ハ)の全
重量中35重量%以下、好ましくは5〜25重量%の範
囲である。(ハ)単位がこの範囲にあるのは35重量%
を超えると得られるフッ素ゴムのゴム弾性が低下するた
めである。なお、(イ)単位と(ロ)単位からなる2元
系フッ素ゴムでは(イ)単位と(ロ)単位の重量比が5
5:45ないし75:25好ましくは60:40ないし
70:30の範囲である。
In the tertiary fluororubber containing the unit (c), the content of the unit (c) is 35% by weight or less, preferably 5 to 25% by weight based on the total weight of (a), (b) and (c). % Range. (C) Units in this range are 35% by weight
This is because the rubber elasticity of the obtained fluoro rubber is reduced when the ratio exceeds the above range. In the case of the binary fluororubber composed of the units (a) and (b), the weight ratio between the units (a) and (b) is 5
The range is from 5:45 to 75:25, preferably from 60:40 to 70:30.

【0009】更に、本発明の(a)成分として用いるフ
ッ素ゴムでは分子量の指標となる〔η〕は50〜200
ml/gの範囲である。好ましくは60〜150ml/
gの範囲である。〔η〕が50ml/g未満では破断強
度や耐圧縮永久ひずみ性が低下するとともにプレス加硫
時の金型離型性が悪化する。一方、200ml/gを越
えるとロール混練作業が困難になる。
Further, in the fluororubber used as the component (a) of the present invention, [η] which is an index of the molecular weight is 50 to 200.
It is in the range of ml / g. Preferably 60 to 150 ml /
g. When [η] is less than 50 ml / g, the breaking strength and the compression set resistance are reduced, and the mold release property during press vulcanization is deteriorated. On the other hand, if it exceeds 200 ml / g, roll kneading becomes difficult.

【0010】加えて、本発明の(a)成分として用いる
フッ素ゴムの「分子量分布」に関してM5 の成分比が2
0〜70%好ましくは30〜65%、M100 の成分比が
2〜30%好ましくは5〜25%である。フッ素ゴム加
硫物の硬度はM5 に大きく依存しM5の成分比が20%
未満では本発明の目的を達成できない。またM5 の成分
比が70%以上ではロール混練作業性、プレス加硫時の
金型離型性に悪影響を及ぼす。さらにM100 の成分比が
2〜30%の範囲にあるのは、2%未満では破断強度の
不足及び耐圧縮永久ひずみ性の低下を招き、30%を越
えると本発明の目的を達成し難いばかりかロール混練作
業性の悪化をもたらすからである。
In addition, regarding the “molecular weight distribution” of the fluororubber used as the component (a) of the present invention, the component ratio of M 5 is 2
0% to 70% preferably 30 to 65% ratio of components M 100 is 2 to 30%, preferably 5 to 25%. Component ratio of the fluororubber vulcanizate hardness greatly depends on the M 5 M 5 20%
If less than the above, the object of the present invention cannot be achieved. The kneading workability in component ratio of M 5 is at least 70%, adversely affect the mold release properties of press vulcanization. Even more component ratio of M 100 is in the range from 2 to 30 percent, is less than 2% leads to insufficient and a decrease in compression set of the breaking strength, it is difficult to achieve the object of the present invention exceeds 30% This is because the workability of the roll kneading is deteriorated.

【0011】本発明の(b)成分として用いる架橋剤と
しては、ビスフェノールA、ビスフェノールAF、ハイ
ドロキノン、ビスフェノールS、4, 4' −ジヒドロキ
シベンゾフェノン、4, 4' −チオジフェノール、1,
3, 5−トリヒドロキシベンゼン、1,7−ジヒドロキ
シナフタレン、2,6−ジヒドロキシアントラセン、C
2 (CF2 CH2 OH)2 などのポリヒドロキシ化合
物、1,3,5−トリアジン−2,4,6−トリチオー
ルなどのトリアジンチオール誘導体などが挙げられ、特
に好ましいのはビスフェノールAFであり、またこれら
はアルカリ金属塩又はアルカリ土類金属塩であっても良
い。さらに、これらの化合物はそれぞれ単独で用いても
よいし、2種以上組み合わせてもよい。
The crosslinking agent used as the component (b) in the present invention includes bisphenol A, bisphenol AF, hydroquinone, bisphenol S, 4,4′-dihydroxybenzophenone, 4,4′-thiodiphenol,
3,5-trihydroxybenzene, 1,7-dihydroxynaphthalene, 2,6-dihydroxyanthracene, C
Examples thereof include polyhydroxy compounds such as F 2 (CF 2 CH 2 OH) 2 and triazine thiol derivatives such as 1,3,5-triazine-2,4,6-trithiol. Particularly preferred is bisphenol AF, These may be alkali metal salts or alkaline earth metal salts. Further, these compounds may be used alone or in combination of two or more.

【0012】本発明の(c)成分として用いる加硫促進
剤としては、例えば第四級アンモニウム塩、第四級ホス
ホニウム塩、イミニウム塩、スルホニウム塩、アミノホ
スフィン酸誘導体及び8−アルキル(又はアラルキル)
−1,8−ジアザビシクロ〔5,4,0〕−7−ウンデ
センの第四級アンモニウム塩、5−アルキル(又はアラ
ルキル)−1,5−ジアザビシクロ〔4,3,0〕−5
−ノネンの第四級アンモニウム塩などが挙げられる。
Examples of the vulcanization accelerator used as the component (c) in the present invention include quaternary ammonium salts, quaternary phosphonium salts, iminium salts, sulfonium salts, aminophosphinic acid derivatives and 8-alkyl (or aralkyl).
Quaternary ammonium salt of -1,8-diazabicyclo [5,4,0] -7-undecene, 5-alkyl (or aralkyl) -1,5-diazabicyclo [4,3,0] -5
-Quaternary ammonium salts of nonene.

【0013】特に好ましいのはベンジルトリフェニルホ
スホニウムクロライド、テトラブチルアンモニウムブロ
マイド、ビス(ベンジルジフェニルホスフィン)イミニ
ウムクロライド、及び8−ベンジル−1,8−ジアザ−
ビシクロ〔5,4,0〕−7−ウンデセニウムクロライ
ドである。これらの化合物はそれぞれ単独で用いてもよ
いし、2種以上組み合わせてもよい。
Particularly preferred are benzyltriphenylphosphonium chloride, tetrabutylammonium bromide, bis (benzyldiphenylphosphine) iminium chloride, and 8-benzyl-1,8-diaza-chloride.
Bicyclo [5,4,0] -7-undecenium chloride. These compounds may be used alone or in combination of two or more.

【0014】本発明の(d)成分として用いる二価金属
酸化物又は二価金属水酸化物としては、酸化マグネシウ
ム、酸化カルシウム、酸化鉛、酸化亜鉛、水酸化マグネ
シウム、水酸化カルシウムなどが挙げられる。本発明の
フッ素ゴム加硫組成物における前記各成分の配合割合に
ついては、通常(a)成分100重量部に対して、
(b)成分0.5〜3重量部、好ましくは1〜2.5重
量部、(c)成分0.05〜2重量部、好ましくは0.
1〜1.5重量部、(d)成分1〜20重量部、好まし
くは2〜10重量部である。
The divalent metal oxide or divalent metal hydroxide used as the component (d) of the present invention includes magnesium oxide, calcium oxide, lead oxide, zinc oxide, magnesium hydroxide, calcium hydroxide and the like. . About the compounding ratio of each component in the fluororubber vulcanizing composition of the present invention, the component (a) is usually 100 parts by weight with respect to the component (a).
Component (b) 0.5 to 3 parts by weight, preferably 1 to 2.5 parts by weight, and component (c) 0.05 to 2 parts by weight, preferably 0.1 to 2 parts by weight.
1 to 1.5 parts by weight, 1 to 20 parts by weight of component (d), preferably 2 to 10 parts by weight.

【0015】本発明の(b)成分を前記範囲とするのは
0.5重量部未満では十分な加硫度が得られず、3重量
部を超えると硬度の大幅上昇を招くためである。(c)
成分を前記範囲とするのは0.05重量部未満では十分
な加硫速度が得られず、2重量部を超えると耐圧縮永久
ひずみ性の大幅な悪化を招くためである。(d)成分を
前記範囲とするのは1重量部未満では十分な加硫速度が
得られず、20重量部を超えると耐圧縮永久ひずみ性が
大幅に悪化するためである。
The reason that the component (b) of the present invention falls within the above range is that if the amount is less than 0.5 part by weight, a sufficient degree of vulcanization cannot be obtained, and if it exceeds 3 parts by weight, the hardness is greatly increased. (C)
If the component is in the above range, a sufficient vulcanization rate cannot be obtained if the content is less than 0.05 part by weight, and if the content exceeds 2 parts by weight, the compression set resistance is greatly deteriorated. If the component (d) is in the above range, a sufficient vulcanization rate cannot be obtained if the amount is less than 1 part by weight, and if it exceeds 20 parts by weight, the compression set resistance is greatly deteriorated.

【0016】更に、本発明のフッ素ゴム加硫組成物にお
いては、必要に応じ、他の成分、例えばカーボンブラッ
ク、グラファイト、シリカ、クレー、ケイソウ土、タル
ク、炭酸カルシウム、フッ化カルシウム、硫酸バリウ
ム、スルホン化合物などの充填剤、加工助剤、可塑剤、
着色剤等を配合することができるし、本発明の主旨を逸
脱しない範囲であれば、従来公知の加硫剤や加硫促進剤
を1種又は2種配合してもよい。
Further, in the vulcanized fluororubber composition of the present invention, if necessary, other components such as carbon black, graphite, silica, clay, diatomaceous earth, talc, calcium carbonate, calcium fluoride, barium sulfate, Fillers such as sulfone compounds, processing aids, plasticizers,
A coloring agent or the like can be blended, and one or two types of conventionally known vulcanizing agents and vulcanization accelerators may be blended within a range not departing from the gist of the present invention.

【0017】このようにして得られたフッ素ゴム加硫組
成物は、常法に従って加硫される。この加硫方法として
は、例えば開放型練りロール又は密閉式練りロール(バ
ンバリーミキサー、加圧式ニーダー等)で混練後、型に
入れ加圧して一次加硫し、次いで二次加硫する方法が挙
げられる。一般に、一次加硫の条件として温度120〜
200℃、時間1〜180分、圧力20〜150kg/
2の範囲が、二次加硫の条件としては、温度120〜
250℃、時間0〜48時間の範囲が採用される。
The fluororubber vulcanized composition thus obtained is vulcanized according to a conventional method. As the vulcanization method, for example, a method of kneading with an open kneading roll or a closed kneading roll (Banbury mixer, pressurized kneader, etc.), placing the mixture in a mold, pressurizing, performing primary vulcanization, and then performing secondary vulcanization. Can be Generally, the primary vulcanization condition is a temperature of 120 to
200 ° C, time 1-180 minutes, pressure 20-150kg /
range of m 2 is, as a condition of the secondary vulcanization, temperature 120 to
A range of 250 ° C. for a time of 0 to 48 hours is employed.

【0018】また、他の加硫手段として、射出又は押出
しなどの予備成形をした後に加硫する方法、あるいはメ
チルエチルケトン、アセトンなどのケトン類、エチルエ
ーテル、テトラヒドロフランなどのエーテル類などの1
種又は2種以上を媒体とする溶液もしくは分散液を調整
し、これで紙、繊維、フィルム、シート、板、チュー
ブ、パイプ、タンク、大型容器その他の成形品の表面上
を被覆し加硫する方法などを用いることもできる。
As another vulcanization means, a method of vulcanization after preforming such as injection or extrusion, or a method of vulcanization such as ketones such as methyl ethyl ketone and acetone, and ethers such as ethyl ether and tetrahydrofuran.
Prepare a solution or dispersion using a seed or two or more kinds as a medium, and coat and vulcanize the surface of paper, fiber, film, sheet, plate, tube, pipe, tank, large container or other molded product with this. A method or the like can also be used.

【0019】本発明のフッ素ゴム加硫組成物は、混練作
業性及び加硫成形品の歩留まりの悪化、加硫成形品の破
断強度低下を招かずに従来のフッ素ゴム加硫物と同様に
耐熱性、耐油性、耐圧縮永久ひずみ性に優れた加硫物特
性を維持しつつ、硬さ50°以下の低硬度を達成してい
る。従って、本発明のフッ素ゴム加硫物は各種工業分
野、例えば自動車、OA機器、船舶、航空機、油圧機
器、一般機械工業、公害関連部門などにおいて、O−リ
ング、ガスケット、オイルシール、ダイヤフラム、ホー
ス、ロール、シート材などとして広く使用できるばかり
でなく、防振ゴム用途、弱い締め付け力でシール性を要
求されようなシール部品にも使用可能であり工業的価値
は極めて高い。
The vulcanized fluororubber composition of the present invention has the same heat resistance as a conventional vulcanized rubber vulcanizate without deteriorating the workability of kneading, the yield of the vulcanized molded product, and reducing the breaking strength of the vulcanized molded product. It achieves a low hardness of 50 ° or less while maintaining vulcanizate properties excellent in heat resistance, oil resistance and compression set resistance. Therefore, the fluororubber vulcanizates of the present invention can be used in various industrial fields such as automobiles, OA equipment, ships, aircraft, hydraulic equipment, general machinery industry, pollution-related departments, etc., for O-rings, gaskets, oil seals, diaphragms, hoses and the like. Not only can it be widely used as rolls, sheets, etc., it can also be used for vibration-proof rubber applications and for sealing parts that require sealing properties with a weak tightening force, and are extremely high in industrial value.

【0020】なお、本発明のフッ素ゴムの極限粘度及び
5、M100の算出基準となる分子量分布は、以下の条件
で測定して得られた数値がベースとなっている。極限粘
度 メチルエチルケトンを溶媒とする0.1g/100
mlの濃度溶液を毛細管粘度計を用いて35℃で測定し
た。 分子量分布 液体クロマトグラフ:LC−3A型(島津製作所(株) 製) カラム:KF−80M(2本)+KF−800P(プレ カラム)(昭和電工(株)) 検出器:ERC−7510S(エマル光学(株)製) インテグレーター:7000A(システムインスツルメ ンツ社製) 展開溶媒:テトラヒドロフラン 濃度:0.1重量% 温度:35℃ 分子量検量線用標準ポリマー:単分散ポリスチレン各種 (東洋曹達(株)製)(Mw/Mn= 1.2(max))
The intrinsic viscosity of the fluororubber of the present invention and the molecular weight distribution used as a reference for calculating M 5 and M 100 are based on numerical values measured under the following conditions. Intrinsic viscosity 0.1 g / 100 using methyl ethyl ketone as a solvent
ml of the concentration solution was measured at 35 ° C. using a capillary viscometer. Molecular weight distribution Liquid chromatograph: LC-3A (manufactured by Shimadzu Corporation) Column: KF-80M (2 present) + KF-800P (precolumn) (Showa Denko KK) detector: ERC-7510S (Emar Optical Co., Ltd.) Integrator: 7000A (manufactured by System Instruments) Developing solvent: tetrahydrofuran Concentration: 0.1% by weight Temperature: 35 ° C. Standard polymer for molecular weight calibration curve: Monodisperse polystyrene (Toyo Soda Co., Ltd.) (Mw / Mn = 1.2 (max))

【0021】[0021]

【実施例】次ぎに実施例により本発明をさらに詳細に説
明するが、本発明はこれらの例によってなんら限定され
るものではない。なお、ムーニー粘度はJIS K63
00、加硫物の硬さ[JIS-A ]、100%引張応力、引
張強さ、伸び、圧縮永久ひずみはJIS K6301に
準じて測定した。
EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The Mooney viscosity is JIS K63.
The hardness of the vulcanizate [JIS-A], 100% tensile stress, tensile strength, elongation, and compression set were measured according to JIS K6301.

【0022】[0022]

【実施例1】組成がフッ化ビニリデン単位63重量%、
ヘキサフルオロプロピレン単位37重量%、ML
1+10(121℃)が40、[η]が100ml/
g、Mが44%、M100が10%であるフッ素ゴム
100重量部を開放型練りロールに巻付け、ビスフェノ
ールAF2重量部、ビス(ベンジルジフェニルホスフィ
ン)イミニウムクロライド0.45重量部を練り込み、
Cancarb社製カーボンブラック「サーマックスN
−990」3重量部、水酸化カルシウム3重量部、協和
化学工業株式会社製高活性酸化マグネシウム「キョーワ
マグ150」3重量部を練り込んだ後、そのまま一夜放
置して熟成させた。
Example 1 A composition having a vinylidene fluoride unit of 63% by weight,
Hexafluoropropylene unit 37% by weight, ML
1 + 10 (121 ° C.) is 40, [η] is 100 ml /
g, M 5 44%, winding the fluorine rubber 100 parts by weight of open mill rolls M 100 is 10%, of bisphenol AF2 parts by kneading bis (benzyldiphenylphosphine) iminium chloride 0.45 parts by weight Including
Carbon black "Thermax N" manufactured by Cancarb
After mixing 3 parts by weight of "-990", 3 parts by weight of calcium hydroxide, and 3 parts by weight of highly active magnesium oxide "Kyowa Mag 150" manufactured by Kyowa Chemical Industry Co., Ltd., the mixture was left to stand overnight and aged.

【0023】その後、再練りを行ってから金型に入れ、
温度170℃でプレス加硫を15分間行いシート並びに
温度170℃でプレス加硫を20分間行いJIS円柱に
成形した。次いで金型から取り出し、温度232℃の空
気循環式炉内で24時間加熱して二次加硫を完結させ各
種試験を行った。
Then, after re-kneading, put in a mold,
Press vulcanization was performed at a temperature of 170 ° C. for 15 minutes, and press vulcanization was performed at a temperature of 170 ° C. for 20 minutes to form a JIS cylinder. Next, the mold was taken out of the mold and heated in an air circulation furnace at a temperature of 232 ° C. for 24 hours to complete secondary vulcanization, and various tests were performed.

【0024】このようにして得られた加硫成形物の常態
物性、耐圧縮永久ひずみ性(200℃×70時間)を表
1に示す。
Table 1 shows the physical properties of the vulcanized molded article thus obtained and the compression set resistance (200 ° C. × 70 hours).

【0025】[0025]

【比較例1】フッ素ゴムを組成がフッ化ビニリデン単位
63重量%、ヘキサフルオロプロピレン単位37重量
%、ML1+10(121℃)が65、[η]が90
l/g、Mが16%、M100が2.5%であるフッ
素ゴムにする以外は実施例1と同様にして加硫成形物を
調整し各種試験を行った。結果を表1に示す。
COMPARATIVE EXAMPLE 1 A fluororubber was composed of 63% by weight of vinylidene fluoride units, 37% by weight of hexafluoropropylene units, ML 1 + 10 (121 ° C.) of 65, and [η] of 90 m.
l / g, M 5 16%, was adjusted to various tests a vulcanized molded article in the same manner as in Example 1, except that M 100 is a fluorine rubber is 2.5%. Table 1 shows the results.

【0026】実施例1と比較例1を比較すると、大幅な
破断強度の低下並びに圧縮永久ひずみの悪化を招かずに
加硫成形品の硬度が低下していることが分かる。
Comparing Example 1 with Comparative Example 1, it can be seen that the hardness of the vulcanized molded article is reduced without causing a significant decrease in breaking strength and deterioration of compression set.

【0027】[0027]

【0028】[0028]

【0029】[0029]

【実施例2】ビスフェノールAFを1重量部にする以外
は実施例1と同様にして加硫成形物を調整し、各種試験
を行なった、結果を表1に示す。
Example 2 A vulcanized molded product was prepared and subjected to various tests in the same manner as in Example 1 except that the amount of bisphenol AF was changed to 1 part by weight. The results are shown in Table 1.

【0030】[0030]

【実施例3】ビスフェノールAFを1重量部に「サーマ
ックスN−990」に代わり日本シリカ社製「Nips
il−ES」を3重量部にする以外は、実施例1と同様
にして加硫成形物を調整し、各種試験を行なった。結果
を表1に示す。
Example 3 Bisphenol AF was replaced by "Nipps" Nippon Silica Co., Ltd.
A vulcanized molded product was prepared and subjected to various tests in the same manner as in Example 1 except that "il-ES" was changed to 3 parts by weight. Table 1 shows the results.

【0031】[0031]

【表1】 [Table 1]

【0032】[0032]

【発明の効果】本発明のフッ素ゴム加硫組成物は、混練
作業性及び加硫成形品の歩留まりの悪化、加硫成形品の
破断強度低下を招かずに従来のフッ素ゴム加硫物と同様
に耐熱性、耐油性、耐圧縮永久ひずみ性に優れた加硫物
特性を維持しつつ、硬さ50゜以下の低硬度を達成して
いる。
The vulcanized fluororubber composition of the present invention has the same properties as the conventional vulcanized vulcanizate without deteriorating the workability of kneading, the yield of the vulcanized molded product, and reducing the breaking strength of the vulcanized molded product. In addition, while maintaining the vulcanizate properties excellent in heat resistance, oil resistance, and compression set resistance, a low hardness of 50 ° or less is achieved.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 斉藤 廣 神奈川県川崎市川崎区夜光1丁目3番1 号 旭化成工業株式会社 (72)発明者 戸田 圭一 神奈川県川崎市川崎区夜光1丁目3番1 号 旭化成工業株式会社 (56)参考文献 特開 平2−160810(JP,A) 特開 昭63−277217(JP,A) (58)調査した分野(Int.Cl.6,DB名) C08L 27/00,27/16 C08K 3/00,3/22 A23B 7/00,7/10 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Saito, 1-3-1, Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Kasei Kogyo Co., Ltd. No. Asahi Kasei Kogyo Co., Ltd. (56) References JP-A-2-160810 (JP, A) JP-A-63-277217 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C08L 27 / 00,27 / 16 C08K 3 / 00,3 / 22 A23B 7 / 00,7 / 10

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】(a)フッ化ビニリデン単位とヘキサフル
オロプロピレン単位、又はフッ化ビニリデン単位とヘキ
サフルオロプロピレン単位と35重量%以下のテトラフ
ルオロエチレン単位から成り、極限粘度数が50〜20
0ml/gであり、分子量分布がモノモダルであって分
子量5万以下の成分比が20〜70%かつ分子量100
万以上の成分比が2〜30%であるフッ素ゴム、(b)
架橋剤、(c)加硫促進剤、及び(d)二価金属酸化物
又は二価金属水酸化物又はそれらの混合物から成ること
を特徴とする50゜以下(JIS−A)の低硬度フッ素
ゴム加硫物を与える加硫性組成物。
(A) a vinylidene fluoride unit and a hexafluoropropylene unit, or a vinylidene fluoride unit, a hexafluoropropylene unit and 35% by weight or less of a tetrafluoroethylene unit, having an intrinsic viscosity of 50 to 20;
0 ml / g, the molecular weight distribution is monomodal, the ratio of components having a molecular weight of 50,000 or less is 20 to 70%, and the molecular weight is 100%.
A fluororubber having a component ratio of 10,000 or more of 2 to 30%, (b)
Crosslinking agent, (c) a vulcanization accelerator, and (d) be formed of a divalent metal oxide or divalent metal hydroxide or mixtures thereof
50 ° or less, wherein (JIS-A) of low hardness fluorine rubber vulcanization was giving vulcanizable composition.
JP3021891A 1991-02-25 1991-02-25 Low hardness fluoro rubber vulcanizing composition Expired - Lifetime JP2965721B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3021891A JP2965721B2 (en) 1991-02-25 1991-02-25 Low hardness fluoro rubber vulcanizing composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3021891A JP2965721B2 (en) 1991-02-25 1991-02-25 Low hardness fluoro rubber vulcanizing composition

Publications (2)

Publication Number Publication Date
JPH04268357A JPH04268357A (en) 1992-09-24
JP2965721B2 true JP2965721B2 (en) 1999-10-18

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Country Link
JP (1) JP2965721B2 (en)

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Publication number Priority date Publication date Assignee Title
EP0796877B1 (en) * 1994-12-06 1999-03-10 Daikin Industries, Ltd. Elastic fluorocopolymer excellent in processability in molding, process for the preparation thereof, and vulcanizable composition excellent in processability in molding
JP4316937B2 (en) 2003-06-09 2009-08-19 ヤマウチ株式会社 Cushioning material for heat press with vulcanized fluoro rubber layer
JP5291608B2 (en) * 2009-12-11 2013-09-18 オムロン株式会社 Rubber composition and use thereof
JP5067466B2 (en) * 2010-11-02 2012-11-07 ユニマテック株式会社 Fluorine-containing elastomer blend
WO2013141253A1 (en) * 2012-03-19 2013-09-26 ダイキン工業株式会社 Fluorine rubber composition
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