JPH07290551A - Molding of fluoroplastic - Google Patents
Molding of fluoroplasticInfo
- Publication number
- JPH07290551A JPH07290551A JP6088716A JP8871694A JPH07290551A JP H07290551 A JPH07290551 A JP H07290551A JP 6088716 A JP6088716 A JP 6088716A JP 8871694 A JP8871694 A JP 8871694A JP H07290551 A JPH07290551 A JP H07290551A
- Authority
- JP
- Japan
- Prior art keywords
- extrusion
- ptfe
- extrusion aid
- fluororesin
- molding
- 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.)
- Pending
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、フッ素樹脂成形方法に
関するものである。詳しくは、ポリテトラフルオロエチ
レンの成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluororesin molding method. Specifically, it relates to a method for molding polytetrafluoroethylene.
【０００２】[0002]
【従来の技術】ポリテトラフルオロエチレン（以下、Ｐ
ＴＦＥと略称する）は、耐熱性、耐薬性、耐候性、電気
的絶縁性等に優れた特性を有しているが、実用特性をそ
なえているものは、その溶融粘度が極めて高いため、通
常の熱可塑性樹脂で用いられている押出成形等の成形方
法が適用できない。2. Description of the Related Art Polytetrafluoroethylene (hereinafter referred to as P
(Abbreviated as TFE) has excellent properties such as heat resistance, chemical resistance, weather resistance, and electrical insulation. However, those with practical properties have a very high melt viscosity, so Molding methods such as extrusion molding that are used for the above thermoplastic resins cannot be applied.
【０００３】従って、この様なＰＴＦＥを成形するため
従来より種々の検討がなされてき、その成形法として
は、例えば特開平１−３０６２１９号公報、特開平３−
４２２２３号公報、特開平５−２８７１５１号公報、特
開平５−３０１２９４号公報等が開示されている。Therefore, various studies have been made in the past for molding such PTFE, and the molding method thereof is, for example, JP-A-1-306219 or JP-A-3-306219.
No. 42223, JP-A-5-287151, JP-A-5-301294 and the like are disclosed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
ＰＴＦＥ成形法においては、ＰＴＦＥに押出助剤を加え
てペースト状にしたコンパウンドを事前に円筒状に予備
成形した後、押出助剤が揮散しないように、できたビレ
ットを押出機に入れラム押出等で加圧状態下で押出す方
法であるが、この方法では原料が間欠的に押出機に供給
されるため、供給量によって成形品量が限られるため長
尺品が得にくく、しかも、非連続工程となることから生
産性にも劣るものであった。更に、ＰＴＦＥの押出助剤
がナフサ、石油系炭化水素等の有機溶剤が適用されて
い、しかも、押出成形品中にも残存していることから加
熱又は抽出等による除去工程、続いての焼成工程等で常
に引火や爆発の危険性があるのみならず、製造設備にお
いて防爆対策、排気対策等が必要になる等の問題があ
る。However, in the conventional PTFE molding method, the compound which is made into a paste by adding the extrusion aid to PTFE is preformed into a cylindrical shape in advance, and the extrusion aid is prevented from volatilizing. In this method, the resulting billet is put into an extruder and extruded under a pressurized state by ram extrusion or the like.However, in this method, the raw material is intermittently supplied to the extruder. Therefore, it is difficult to obtain a long product, and the productivity is poor because the process is a discontinuous process. Furthermore, since an organic solvent such as naphtha or petroleum hydrocarbon is applied as the extrusion aid of PTFE and remains in the extruded product, the removal process by heating or extraction, and the subsequent firing process. In addition to the danger of ignition and explosion, there is a problem that explosion-proof measures and exhaust measures are required in manufacturing equipment.
【０００５】本発明は、上述のような問題点を解消し、
作業環境の安全性が保たれ、しかも、ＰＴＦＥの連続押
出成形が可能で、かつ、その成形性に優れるフッ素樹脂
成形法を提供することを目的とする。The present invention solves the above problems,
An object of the present invention is to provide a fluororesin molding method which can maintain the safety of the working environment, can perform continuous extrusion molding of PTFE, and has excellent moldability.
【０００６】[0006]
【問題を解決するための手段】この目的に沿う本発明の
フッ素樹脂成形法は、ＰＴＦＥ及び水系押出助剤を主成
分とした組成物をスクリュ押出成形するフッ素樹脂成形
法において、該ＰＴＦＥがファインパウダーであって、
且つ、該水系押出助剤がフッ素系界面活性剤を含有して
いることを特徴とするものである。The fluororesin molding method of the present invention for this purpose is a fluororesin molding method in which a composition containing PTFE and an aqueous extrusion aid as a main component is screw-extruded, and the PTFE is fine. Powder,
In addition, the water-based extrusion aid contains a fluorine-based surfactant.
【０００７】本発明におけるＰＴＦＥは、公知の乳化重
合法で得られるＰＴＦＥのファインパウダーである。Ｐ
ＴＦＥはテトラフルオロエチレンの単独重合体、或いは
他の共重合可能な単量体との共重合体、それらの混合体
等が挙げられる。かかる共重合可能な単量体としては、
例えばヘキサフルオロプロピレン、クロロトリフルオロ
エチレン、パーフルオロ（アルキルビニルエーテル）、
パーフルオロ（アルコキシビニルエーテル）トリフルオ
ロエチレン、パーフルオロアルキルエチレン等が挙げら
れ、共重合体量はＰＴＦＥに溶融流動性を付与しない
量、好ましくは０〜１０重量％の範囲であることが望ま
しい。ＰＴＦＥの分子量は、特に限定されるものではな
いが、本発明においては、その目安となる最大リダクシ
ョン比が３００以上、好ましくは５００以上にあるもの
が成形性等の面から好適である。最大リダクション比が
３００以下では細孔ノズル、間隙の狭いスリット等から
の安定吐出が難しくなる場合がある。本発明でいうリダ
クション比とは以下のように定義される。すなわち、フ
ァインパウダーの物性であって、押出可能な時の押出シ
リンダーと押出物の断面積の比である。なお、ファイン
パウダーとはフッ素樹脂ハンドブック（日刊工業新聞社
発行）などに定義されており、乳化重合で得られたＰＴ
ＦＥ水性分散体を凝集、乾燥して粒径約３００〜６００
μｍに調整した形態のものである。The PTFE in the present invention is a fine PTFE powder obtained by a known emulsion polymerization method. P
Examples of TFE include a homopolymer of tetrafluoroethylene, a copolymer with another copolymerizable monomer, and a mixture thereof. Examples of such a copolymerizable monomer include
For example, hexafluoropropylene, chlorotrifluoroethylene, perfluoro (alkyl vinyl ether),
Examples thereof include perfluoro (alkoxy vinyl ether) trifluoroethylene and perfluoroalkyl ethylene. The amount of the copolymer does not impart melt flowability to PTFE, and is preferably in the range of 0 to 10% by weight. The molecular weight of PTFE is not particularly limited, but in the present invention, it is preferable that the maximum reduction ratio as a guideline is 300 or more, preferably 500 or more from the viewpoint of moldability and the like. If the maximum reduction ratio is 300 or less, stable ejection from a fine nozzle, a slit having a narrow gap, or the like may be difficult. The reduction ratio in the present invention is defined as follows. That is, it is the physical property of fine powder and is the ratio of the cross-sectional area of the extruding cylinder and the extrudate when it is extrudable. Fine powder is defined in the Fluororesin Handbook (published by Nikkan Kogyo Shimbun) and the like, and PT obtained by emulsion polymerization
FE aqueous dispersion is aggregated and dried to a particle size of about 300-600
It is in a form adjusted to μm.
【０００８】本発明における水系押出助剤は、フッ素系
界面活性剤を含む水溶液である。特に、水系押出助剤は
ＰＴＦＥを湿潤し、加圧下、容易に塑性変形を誘起させ
ると共に成形品に残存しにくい、しないものが好適であ
る。かかるフッ素系界面活性剤としては、水溶性を示す
陰イオン系界面活性剤、陽イオン系界面活性剤、両イオ
ン系界面活性剤、非イオン系界面活性剤の中から選ばれ
た少なくとも１種以上が適応されるが、フッ素系界面活
性剤は加熱により昇華、或いは分解し成形品に残存しな
いものがより好ましい。具体例としては、例えばパーフ
ルオロアルキルカルボン酸塩、パーフルオロアルキルリ
ン酸エステル、パーフルオロアルキルトリメチルアンモ
ニウム塩、パーフルオロアルキルベタイン、パーフルオ
ロアルキルアミンオキサイド、パーフルオロアルキルス
ルホン酸塩、パーフルオロアルキルＥＯ付加物等が挙げ
られる。水系押出助剤中でのフッ素系界面活性剤の量
は、０．５〜５０重量％が好ましく、５〜２０重量％の
範囲にあるものが湿潤性や押出成形性、更にはコスト面
でより好ましい。The aqueous extrusion aid in the present invention is an aqueous solution containing a fluorosurfactant. In particular, the water-based extrusion aid is preferably one that does not wet the PTFE and easily induce plastic deformation under pressure and does not easily remain in the molded product. As the fluorine-based surfactant, at least one selected from water-soluble anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants. However, it is more preferable that the fluorine-based surfactant does not remain in the molded product by being sublimated or decomposed by heating. Specific examples include perfluoroalkylcarboxylic acid salts, perfluoroalkylphosphoric acid esters, perfluoroalkyltrimethylammonium salts, perfluoroalkylbetaines, perfluoroalkylamine oxides, perfluoroalkylsulfonic acid salts, perfluoroalkylEO additions. Things etc. are mentioned. The amount of the fluorosurfactant in the water-based extrusion aid is preferably 0.5 to 50% by weight, and the amount in the range of 5 to 20% by weight is more preferable in terms of wettability, extrusion moldability, and cost. preferable.
【０００９】本発明では、ＰＴＦＥに充填材を含有させ
た時、その分散性を良化させたり、より押出成形性を良
化せしめるために、本発明の効果を損なわない量で、前
記水系押出助剤に有機溶剤を少量添加してもよい。かか
る有機溶剤としては、１種以上の混合体であってもよ
く、例えばソルベントナフサ、ホワイトオイル、石油エ
ーテル、アセトン、メチルエチルケトン、エチレングリ
コール、グリセリン、エチルアルコール、メチルアルコ
ール、イソプロピルアルコール、エチレングリコールモ
ノブチルエーテル等が挙げられるが、中では水溶性有機
溶剤が好ましく、特にイソプロピルアルコール、エチル
アルコールの適用が望ましい、有機溶剤の添加量は、好
ましくは水系押出助剤量の１〜４０重量％、より好まし
くは５〜２０重量％である。有機溶剤の量が少ないと添
加効果が小さく、多すぎると水系押出助剤の不燃性が損
なわれやすい。In the present invention, when the PTFE contains a filler, in order to improve the dispersibility of the PTFE and the extrusion moldability, the amount of the water-based extrusion is not impaired so as not to impair the effects of the present invention. A small amount of organic solvent may be added to the auxiliary agent. The organic solvent may be a mixture of one or more kinds, for example, solvent naphtha, white oil, petroleum ether, acetone, methyl ethyl ketone, ethylene glycol, glycerin, ethyl alcohol, methyl alcohol, isopropyl alcohol, ethylene glycol monobutyl ether. Among them, water-soluble organic solvents are preferable, and isopropyl alcohol and ethyl alcohol are particularly preferably applied. The amount of the organic solvent added is preferably 1 to 40% by weight, more preferably the amount of the water-based extrusion aid. It is 5 to 20% by weight. If the amount of the organic solvent is small, the effect of addition is small, and if it is too large, the noncombustibility of the water-based extrusion aid is likely to be impaired.
【００１０】本発明では、ＰＴＦＥ及び水系押出助剤を
主成分とした組成物を成形するが、ここで主成分とは、
前記ＰＴＦＥ及び水系押出助剤が組成物中５０重量％以
上、好ましくは７０重量％以上であるものを指し、適
宜、他の物質を含有していてもよい。添加する物質は特
に限定されないが、例えば含フッ素系重合体微粒子、Ｐ
ＴＦＥ水系ディスパージョン、ＰＴＦＥモールディング
パウダー等を挙げることが可能である。In the present invention, a composition containing PTFE and a water-based extrusion aid as main components is molded.
The PTFE and the water-based extrusion aid are used in the composition in an amount of 50% by weight or more, preferably 70% by weight or more, and may optionally contain other substances. The substance to be added is not particularly limited, but for example, fluorine-containing polymer fine particles, P
Examples thereof include TFE water-based dispersion and PTFE molding powder.
【００１１】本発明では、成形品の機械的特性や電気的
特性をより良化せしめるため、押出成形性に悪影響を及
ぼさない範囲で充填材を含有させてもよい。充填材は、
無機系、有機系の中から選ばれた少なくとも１種以上の
適用が可能であり、その形態は粉末状或いは繊維状であ
ってもよい。具体的には、例えばカーボンブラック、グ
ラファイト、二硫化モリブデン、ガラス、カーボン繊
維、ガラス繊維、シリカ、アルミナ、酸化チタン、窒化
炭素、硫酸バリウム、窒化アルミナ、炭化ケイ素、炭化
ジルコニヤ、金属酸化物等の粉末、ポリイミド樹脂、ポ
リフェニレンオキサイド樹脂、ポリサルホン樹脂、ポリ
エーテルイミド樹脂、ポリエーテルケトン樹脂、ポリア
ミドイミド樹脂、ポリフェニレンサルファイト樹脂、ポ
リエーテルスルホン樹脂等が挙げられる。充填材の平均
粒径は０．０１〜１０００μｍが好ましく、０．１〜５
００μｍの範囲にあるものが分散性、取扱い性等の点で
より好ましい。また、充填材の含有量は０．１〜５０重
量％が好ましく、含有量がこの範囲外では成形性等など
が悪化し易い。In the present invention, in order to further improve the mechanical properties and electrical properties of the molded product, a filler may be contained within a range that does not adversely affect the extrusion moldability. The filler is
It is possible to apply at least one kind selected from an inorganic type and an organic type, and the form thereof may be powdery or fibrous. Specifically, for example, carbon black, graphite, molybdenum disulfide, glass, carbon fiber, glass fiber, silica, alumina, titanium oxide, carbon nitride, barium sulfate, alumina nitride, silicon carbide, zirconium carbide, metal oxide, etc. Examples thereof include powder, polyimide resin, polyphenylene oxide resin, polysulfone resin, polyetherimide resin, polyetherketone resin, polyamideimide resin, polyphenylene sulfite resin, and polyethersulfone resin. The average particle size of the filler is preferably 0.01 to 1000 μm, and 0.1 to 5 μm.
Those in the range of 00 μm are more preferable in terms of dispersibility, handleability and the like. Further, the content of the filler is preferably 0.1 to 50% by weight, and if the content is out of this range, the moldability and the like are likely to deteriorate.
【００１２】次に、本発明の成形方法についてより具体
的に説明する。Next, the molding method of the present invention will be described more specifically.
【００１３】押出用組成物は、ＰＴＦＥファインパウダ
ー１００重量部当り水系押出助剤を好ましくは２０〜５
０重量部、より好ましくは２５〜３５重量部添加する。
添加量がこの範囲外では湿潤不良によって流動性の低下
から成形性が悪化しやすいのみならず、成形中に余分な
水系助剤が加圧時に滲み出したり、圧力不足となること
から十分な塑性変形が起りにくい。ＰＴＦＥに水系押出
助剤を添加し均一混合体を得る時、ＰＴＦＥには極力、
機械的剪断力を与えないようにするのが望ましい。ＰＴ
ＦＥに剪断力が加わると繊維化が進むため、押出圧力の
上昇をまねき成形性が悪化し易い。このため、混合には
タンブラーシェーカーミキサ等で緩慢に行なうことが望
ましい。また、充填材を添加するに当っては、事前にＰ
ＴＦＥ粉末と充填材を十分撹拌する方法、ＰＴＦＥの乳
化重合後に添加し均一混合体として得る方法等が適応で
きる。The composition for extrusion preferably comprises 20 to 5 water-based extrusion aids per 100 parts by weight of PTFE fine powder.
0 parts by weight, more preferably 25 to 35 parts by weight is added.
If the amount added is outside this range, not only the moldability tends to deteriorate due to poor fluidity due to poor wetting, but also excessive water-based auxiliaries ooze out during pressurization during molding, or the pressure becomes insufficient, resulting in sufficient plasticity. Deformation is unlikely to occur. When adding a water-based extrusion aid to PTFE to obtain a homogeneous mixture,
It is desirable not to apply mechanical shearing forces. PT
When a shearing force is applied to the FE, the fiberization progresses, so that the extrusion pressure is increased and the moldability is likely to deteriorate. Therefore, it is desirable that the mixing is carried out slowly with a tumbler shaker mixer or the like. In addition, before adding the filler, P
A method in which TFE powder and a filler are sufficiently stirred, a method in which PTFE is added after emulsion polymerization to obtain a homogeneous mixture, and the like can be applied.
【００１４】次いで、均一混合体をスクリュ押出機で連
続的に押出す。スクリュ押出機は、一般に使用されてい
る一軸或いは多軸押出機の適用が可能である。スクリュ
形状は、特に限定されず、より混合・混練効果を高めた
ミキシング型スクリュ等が適用可能であるが、一般的な
フルフライトスクリュを用いるのが好ましい。スクリュ
押出で重要なことは、スクリュの圧縮比と有効長、スク
リュ山頂とシリンダ壁との隙間である。本発明では、ス
クリュの圧縮比が１．０〜４．０、有効長が２０〜３
０、隙間が０．０５〜５．０ｍｍの範囲にあるものが成
形性、成形品の形態保持性等の点でより好ましい。ま
た、押出機シリンダーは、組成物の押出性を考慮し加熱
してもよいが、加熱する場合は好ましくは９０℃以下、
より好ましくは７０℃以下である。押出温度が９０℃以
上では、組成物中の水系押出助剤の分離が著しくなり、
可塑化効果がなくなることから押出圧力が上昇し、押出
性が悪化し易い。Next, the homogeneous mixture is continuously extruded by a screw extruder. As the screw extruder, a generally used single-screw or multi-screw extruder can be applied. The screw shape is not particularly limited, and a mixing type screw or the like having a more effective mixing / kneading effect can be applied, but it is preferable to use a general full flight screw. What is important in screw extrusion is the compression ratio and effective length of the screw, and the clearance between the screw crest and the cylinder wall. In the present invention, the screw compression ratio is 1.0 to 4.0, and the effective length is 20 to 3
It is more preferable that the gap is 0 and the gap is in the range of 0.05 to 5.0 mm in terms of moldability, shape retention of the molded product, and the like. The extruder cylinder may be heated in consideration of the extrudability of the composition, but when heated, it is preferably 90 ° C. or lower,
More preferably, it is 70 ° C. or lower. When the extrusion temperature is 90 ° C or higher, the separation of the water-based extrusion aid in the composition becomes remarkable,
Since the plasticizing effect disappears, the extrusion pressure rises and the extrudability tends to deteriorate.
【００１５】押出成形品は、必要により水系押出助剤を
除去させる。除去は、工程上、通常、連続工程内で押出
後、或いは延伸後に行なわれ、除去方法は、１００〜２
５０℃で加熱乾燥させる方法、或いは水系媒体等に浸漬
しフッ素系界面活性剤を抽出させた後、加熱乾燥する方
法等により実施することができる。抽出する場合の水系
媒体としては、例えば水とエチルアルコール、イソプロ
ピルアルコール、アセトン等との混合体が挙げられる。In the extrusion molded article, the water-based extrusion aid is removed if necessary. The removal is performed on the process, usually after extrusion in a continuous process or after stretching. The removal method is 100 to 2
It can be carried out by a method of heating and drying at 50 ° C., or a method of immersing in a water-based medium or the like to extract the fluorosurfactant and then heating and drying. Examples of the aqueous medium for extraction include a mixture of water and ethyl alcohol, isopropyl alcohol, acetone, or the like.
【００１６】また、本発明では、特にシート、フィル
ム、テープ等の押出成形品を必要により延伸させたり、
続いて焼成してもよい。延伸は一軸或いは二軸であって
もよく、公知の手法である圧延法、逐次延伸法、同時二
軸延伸法、更にはこれらを組合せた方法等が採用可能で
ある。中でも、圧延ロールで処理後、逐次二軸延伸する
方法が薄膜均一化を計れるのでより好ましい。延伸は加
温下の方が延伸性が好ましく、その温度は３０〜２５０
℃の範囲である。焼成する場合は、通常、３５０〜４０
０℃であり、焼成時間は成形品の物性を鑑み適宜に設定
できる。焼成は焼成炉でバッチ方式或いは連続方式等で
行なわれるが、本発明では連続方式を適用するのがより
好ましい。Further, in the present invention, in particular, extruded products such as sheets, films and tapes may be stretched if necessary,
It may be fired subsequently. The stretching may be uniaxial or biaxial, and known methods such as a rolling method, a sequential stretching method, a simultaneous biaxial stretching method, and a method combining these may be employed. Above all, a method of sequentially biaxially stretching after treatment with a rolling roll is more preferable because it can make the thin film uniform. The stretching is preferably performed under heating and the temperature is 30 to 250.
It is in the range of ° C. When firing, it is usually 350-40
It is 0 ° C., and the firing time can be appropriately set in consideration of the physical properties of the molded product. Firing is performed in a firing furnace in a batch system, a continuous system, or the like, but it is more preferable to apply the continuous system in the present invention.
【００１７】[0017]
【特性の測定方法および評価方法】本発明の特性値は、
次の測定方法、評価基準による。[Characteristic measuring method and evaluation method] The characteristic values of the present invention are
According to the following measurement methods and evaluation criteria.
【００１８】（１）成形性 スクリュ押出機に設置したスリット口金からの吐出性及
び吐出物の外観を肉眼観察し、以下の如く判定した。(1) Formability The discharge property from the slit mouthpiece installed in the screw extruder and the appearance of the discharge product were visually observed and judged as follows.
【００１９】○：良好（連続吐出が可能、表面状態も良
い） △：やや不良（連続吐出が不安定、表面粗れがやや多
い） ×：不良（連続吐出が不可） （２）成形品の特性 ＪＩＳ−Ｃ−２３１８に準じて引張強度、引張伸度を測
定した。◯: Good (continuous discharge possible, good surface condition) Δ: Slightly poor (continuous discharge unstable, surface roughness a little) ×: Bad (continuous discharge not possible) (2) Molded product Properties Tensile strength and tensile elongation were measured according to JIS-C-2318.
【００２０】[0020]
【実施例】本発明を以下の実施例、比較例を用いて説明
するが、本発明はこれらに限定されているものではな
い。The present invention will be described with reference to the following examples and comparative examples, but the present invention is not limited thereto.
【００２１】実施例１ ＰＴＦＥとして最大リダクション比が３５００のＰＴＦ
Ｅファインパウダー“ＣＤ−４”（旭硝子（株）製）１
００重量部とフッ素界面活性剤“フタージェント”１１
０（（株）ネオス製）の１０重量％水溶液３０重量部を
タンブラーシェカーミキサで混合後、８時間熟成させ均
一組成物を作製した。Example 1 A PTFE having a maximum reduction ratio of 3500 as PTFE
E fine powder "CD-4" (manufactured by Asahi Glass Co., Ltd.) 1
00 parts by weight and fluorosurfactant "Fugent" 11
30 parts by weight of a 10% by weight aqueous solution of 0 (manufactured by Neos Co., Ltd.) was mixed with a tumbler shaker mixer and aged for 8 hours to prepare a uniform composition.
【００２２】一方、スクリュ押出装置としては、シリン
ダー内径３０ｍｍの一軸押出機で、そのスクリュは外径
２８ｍｍ、圧縮比１．４、有効長２６のフルフライトス
クリュを適用し、更に押出機には先端に組成物の押出圧
力を考慮したスリット間隙２．５ｍｍ、幅２００ｍｍの
口金を取り付け前記組成物を連続的に押出後、５０℃に
加熱した圧延ロールで延伸し、未焼成の成形品を得た。On the other hand, as the screw extruder, a uniaxial extruder having a cylinder inner diameter of 30 mm, a full flight screw having an outer diameter of 28 mm, a compression ratio of 1.4 and an effective length of 26 is applied, and the extruder has a tip. A die with a slit gap of 2.5 mm and a width of 200 mm was attached in consideration of the extrusion pressure of the composition, the composition was continuously extruded, and then stretched by a rolling roll heated to 50 ° C. to obtain an unfired molded product. .
【００２３】次いで、得られた成形品を１００℃で乾燥
させつつ焼成炉に通し３８０℃で１０分間焼成後、直ち
に３５０℃でカレンダリングし、厚さ０．６ｍｍのフィ
ルム成形品とした。該成形品の成形性、特性は表１に示
した通りであり、各特性に優れていた。Then, the obtained molded product was dried at 100 ° C., passed through a baking furnace, baked at 380 ° C. for 10 minutes, and immediately calendered at 350 ° C. to obtain a film molded product having a thickness of 0.6 mm. The moldability and characteristics of the molded product are as shown in Table 1 and were excellent in each characteristic.
【００２４】実施例２，３ 実施例１に基づき、実施例１の全組成物１００重量部に
対して平均粒径０．３μｍのシリカを１０重量部加えた
ものを適用した組成物（実施例２）、実施例１の水系押
出助剤としてフッ素系界面活性剤“サーフロン”Ｓ−１
４１（旭硝子（株）製）を水／イソプロピルアルコール
混合液（混合比；７：３）で調整した１０重量％のもの
適用した組成物（実施例３）の各々を、以下、同施例１
と同一手法で成形品を得た。表１に成形品の特性を示
す。各特性に優れていることが判る。Examples 2 and 3 Based on Example 1, a composition obtained by adding 10 parts by weight of silica having an average particle size of 0.3 μm to 100 parts by weight of the entire composition of Example 1 (Examples 2), a fluorosurfactant "Surflon" S-1 as the aqueous extrusion aid of Example 1
Each of the applied compositions (Example 3) of 41 (manufactured by Asahi Glass Co., Ltd.) prepared by a water / isopropyl alcohol mixed solution (mixing ratio; 7: 3) at 10% by weight was used as in Example 1 below.
A molded product was obtained by the same method as described above. Table 1 shows the characteristics of the molded product. It can be seen that each property is excellent.
【００２５】実施例４ 実施例１に基づき、実施例１のＰＴＦＥとして最大リダ
クション比が２００のものを用いたほかは、実施例１と
同一手法で成形を行ない、その結果を表１に示した。こ
のようにＰＴＦＥの最大リダクション比が低いと連続吐
出が不安定となる傾向にあることが判る。Example 4 Molding was carried out in the same manner as in Example 1 except that the PTFE of Example 1 having a maximum reduction ratio of 200 was used, and the results are shown in Table 1. . It can be seen that continuous discharge tends to be unstable when the maximum reduction ratio of PTFE is low.
【００２６】比較例１，２ 実施例１に基づき、実施例１の水系押出助剤としてアニ
オン系界面活性剤のドデシルベンゼンスルホン酸ナトリ
ウムを適用した組成物（比較例１）、非イオン系界面活
性剤の“ノニオン”ＮＳ−２０８（日本油脂工業（株）
製）を適用した組成物（比較例２）の各々を実施例１と
同一手法で成形を行なった。結果を表１に示す。共にＰ
ＴＦＥへの湿潤性に欠け、スクリュ押出成形が不可であ
った。Comparative Examples 1 and 2 Based on Example 1, a composition (Comparative Example 1) in which anionic surfactant sodium dodecylbenzenesulfonate was applied as the aqueous extrusion aid of Example 1 (Comparative Example 1), nonionic surfactant Agent "NONION" NS-208 (Nippon Yushi Kogyo Co., Ltd.)
Each of the compositions (Comparative Example 2) to which (Production) was applied was molded in the same manner as in Example 1. The results are shown in Table 1. Both P
It lacked wettability to TFE and screw extrusion was impossible.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】本発明のフッ素樹脂成形方法において
は、特定のフッ素樹脂、特定の水系押出助剤を用いるこ
とにより、スクリュ押出成形が可能となったので、次の
ような優れた効果を得ることができた。In the fluororesin molding method of the present invention, screw extrusion molding is possible by using a specific fluororesin and a specific water-based extrusion aid, and thus the following excellent effects are obtained. I was able to.
【００２９】まず、本発明のフッ素樹脂成形方法は、成
形物を連続的に押出すことができるので長尺品が得られ
ると共に、従来の工程が簡略化できるのでコスト面で有
利となる。First, the fluororesin molding method of the present invention is advantageous in terms of cost because a molded product can be continuously extruded to obtain a long product and the conventional process can be simplified.
【００３０】また、本発明のフッ素樹脂成形方法は、水
系押出助剤であるため従来の有機溶剤の使用にともなう
引火や爆発の危険性を低減でき、作業環境の安全が確保
できる。製造設備においても、従来、必要であった防爆
対策、排気ガス処理対策等にかかるコストも低減でき
る。Further, since the fluororesin molding method of the present invention is a water-based extrusion aid, it is possible to reduce the risk of ignition and explosion associated with the use of conventional organic solvents, and to ensure the safety of the working environment. Also in the manufacturing facility, the cost required for the conventional explosion-proof measures and exhaust gas treatment measures can be reduced.
【００３１】更に、本発明のフッ素樹脂成形方法は、水
系押出助剤であるため、その揮発量が少なく、しかも、
静電気の帯電が少ないので後加工性に優れている。Further, in the fluororesin molding method of the present invention, since it is a water-based extrusion aid, its volatilization amount is small, and
Since it is less charged with static electricity, it has excellent post-processability.
【００３２】本発明のフッ素樹脂成形方法は、上記のよ
うな優れた特性を有しているのでシート、フィルム、チ
ューブ、パイプ、ホース、テープ、糸、多孔膜等の製法
に適用できる。Since the fluororesin molding method of the present invention has the above-mentioned excellent properties, it can be applied to a method for manufacturing sheets, films, tubes, pipes, hoses, tapes, threads, porous membranes and the like.
Claims (5)
出助剤を主成分とした組成物をスクリュ押出成形するフ
ッ素樹脂成形方法において、該ポリテトラフルオロエチ
レンがファインパウダーであって、且つ、該水系押出助
剤がフッ素系界面活性剤を含有していることを特徴とす
るフッ素樹脂成形方法。1. A fluororesin molding method for screw extrusion molding a composition comprising polytetrafluoroethylene and an aqueous extrusion aid as main components, wherein the polytetrafluoroethylene is fine powder, and the aqueous extrusion aid is used. A fluororesin molding method, wherein the agent contains a fluorosurfactant.
リダクション比が３００以上であることを特徴とする請
求項１に記載のフッ素樹脂成形方法。2. The fluororesin molding method according to claim 1, wherein the maximum reduction ratio of the polytetrafluoroethylene is 300 or more.
ことを特徴とする請求項１又は請求項２に記載のフッ素
樹脂成形方法。3. The fluororesin molding method according to claim 1, wherein the composition is made to contain a filler.
重量％含有させることを特徴とする請求項１乃至請求項
３のいずれかに記載のフッ素樹脂成形方法。4. An organic solvent is added to the water-based extrusion aid in an amount of 1 to 40.
The fluororesin molding method according to any one of claims 1 to 3, wherein the fluororesin molding method comprises:
の成形をした後、次いで延伸及び／又は焼成することを
特徴とするフッ素樹脂成形方法。5. A method for molding a fluororesin, which comprises performing the molding according to any one of claims 1 to 4 and then stretching and / or firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6088716A JPH07290551A (en) | 1994-04-26 | 1994-04-26 | Molding of fluoroplastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6088716A JPH07290551A (en) | 1994-04-26 | 1994-04-26 | Molding of fluoroplastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07290551A true JPH07290551A (en) | 1995-11-07 |
Family
ID=13950633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6088716A Pending JPH07290551A (en) | 1994-04-26 | 1994-04-26 | Molding of fluoroplastic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07290551A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08208931A (en) * | 1995-02-02 | 1996-08-13 | Tokyo Gas Furoro Material Kk | Production of steel sheet laminated with patterned fluororesin film |
| WO1999043723A1 (en) * | 1998-02-27 | 1999-09-02 | Asahi Glass Company Ltd. | Process for producing aqueous dispersion containing polytetrafluoroethylene |
| WO2007126087A1 (en) * | 2006-05-01 | 2007-11-08 | Nitto Denko Corporation | Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape |
| JP2008114582A (en) * | 2006-05-01 | 2008-05-22 | Nitto Denko Corp | Manufacturing process of polytetrafluoroethylene sheet and manufacturing process of seal tape made of polytetrafluoroethylene |
| JP2009292115A (en) * | 2008-06-09 | 2009-12-17 | Yazaki Corp | Resin molding machine |
| US8105515B2 (en) | 2005-05-12 | 2012-01-31 | Nitto Denko Corporation | Method of manufacturing polytetrafluoroethylene particle aggregate and method of manufacturing polytetrafluoroethylene product |
-
1994
- 1994-04-26 JP JP6088716A patent/JPH07290551A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08208931A (en) * | 1995-02-02 | 1996-08-13 | Tokyo Gas Furoro Material Kk | Production of steel sheet laminated with patterned fluororesin film |
| WO1999043723A1 (en) * | 1998-02-27 | 1999-09-02 | Asahi Glass Company Ltd. | Process for producing aqueous dispersion containing polytetrafluoroethylene |
| US8105515B2 (en) | 2005-05-12 | 2012-01-31 | Nitto Denko Corporation | Method of manufacturing polytetrafluoroethylene particle aggregate and method of manufacturing polytetrafluoroethylene product |
| US8226864B2 (en) | 2005-05-12 | 2012-07-24 | Nitto Denko Corporation | Method of manufacturing polytetrafluoroethylene particle aggregate and method of manufacturing polytetrafluoroethylene product |
| WO2007126087A1 (en) * | 2006-05-01 | 2007-11-08 | Nitto Denko Corporation | Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape |
| JP2008114582A (en) * | 2006-05-01 | 2008-05-22 | Nitto Denko Corp | Manufacturing process of polytetrafluoroethylene sheet and manufacturing process of seal tape made of polytetrafluoroethylene |
| US8268221B2 (en) | 2006-05-01 | 2012-09-18 | Nitto Denko Corporation | Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape |
| US8440127B2 (en) | 2006-05-01 | 2013-05-14 | Nitto Denko Corporation | Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape |
| JP2009292115A (en) * | 2008-06-09 | 2009-12-17 | Yazaki Corp | Resin molding machine |
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