JPS6221819B2 - - Google Patents
Info
- Publication number
- JPS6221819B2 JPS6221819B2 JP53075189A JP7518978A JPS6221819B2 JP S6221819 B2 JPS6221819 B2 JP S6221819B2 JP 53075189 A JP53075189 A JP 53075189A JP 7518978 A JP7518978 A JP 7518978A JP S6221819 B2 JPS6221819 B2 JP S6221819B2
- Authority
- JP
- Japan
- Prior art keywords
- tetrafluoroethylene resin
- fiber material
- porosity
- manufacturing
- porous
- 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
- 239000011347 resin Substances 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 22
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 10
- 239000002657 fibrous material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 3
- -1 filters Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Sealing Material Composition (AREA)
- Filtering Materials (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
本考案は優れた耐薬品性、耐熱性等を有するバ
ツキン、ガスケツト、ベアリング、防音、防振
材、フイルター、耐熱材等として巾広く利用でき
る多孔質四弗化エチレン樹脂からなる焼成体の製
造方法に関するものである。
従来、この種の多孔質物を製造する手段として
は一般に四弗化エチレン樹脂の粉末を加圧成形し
て焼結する方法や、四弗化エチレン樹脂の繊維を
不織布、フエルト等の製造法として知られている
方法（繊維をぬれた状態で加温しつつ反復圧縮作
用をあたえて繊維をからみ合わせて緻密にかため
るところのいわゆる抄紙法に似た方法）が知られ
ている。
しかし前者の方法による場合は四弗化エチレン
樹脂の粉末を焼結しているので、出来上つた製品
は硬くて弾性がなく、しかも多孔の度合を示す空
隙率のコントロールは不可能であり、利用範囲が
限られる等の欠点があつた。そのうえ粉末である
から焼結のために高い面圧例えば、300Kg／cm2を
発生させなければならず、強力な加圧装置が必要
であり、しかもそれにともない強度の高い金型を
必要とし、製造設備に費用が嵩み、製造コストが
高くつく欠点があつた。
また後者の方法による場合は、繊維をからみ合
せているだけであり、各繊維が一体的に結合して
いないから、得られる製品は軟弱で引張り強度並
びに圧縮強度が低い等の欠点があると共に、反復
工程を採るため繁雑な製法であり、前者と同様空
隙率をコントロールすることは不可能という致命
的な欠点があつた。
そこで本発明は主として未焼成の四弗化エチレ
ン樹脂の短繊維材を使用するとともに、この短繊
維材を従来のホツトコイニング法では考えられな
いところの非常識に思われる程、極めて、低面圧
状態で、且つ非結晶状態となる温度以上（焼成温
度）でホツトコイニングすることにより、前記欠
点を一挙に解決した多孔質四弗化エチレン樹脂か
らなる焼成体の製造方法を提供しようとするもの
である。
以下本発明の多孔質四弗化エチレン樹脂からな
る焼成体の製造工程を図面に基づいて説明する。
先ず、所望形状をした表面滑らかな金属製容器
１内に長さが１〜５mmの未焼成四弗化エチレン樹
脂の短繊維材２を均一に充填し、続いてその上面
に所望の密度となるようなデツドウエイトのおも
り４を表面の滑らかな金属製押板３を介して負荷
させる。
この場合のおもりの荷重は、製造する製品の空
隙率に合せて、例えば空隙率を大きくする場合は
軽く、空隙率を小さくする場合は重くするという
ように調節すればよく、そのおもり４の荷重の範
囲は０〜500Kg／m2即ち０〜50ｇ／cm2でよい。な
お、金属製押板３自体の重さは、１cm2当り１ｇ程
度のものである。
そして次に四弗化エチレン樹脂が非結晶状態を
好適に保つ温度350〜380度Ｃに保持した炉５内で
２時間に亘つてホツトコイニングを行なう。さら
にこれを放令すると多孔質四弗化エチレンからな
る焼成体６が得られ、これを金属製容器１より取
り出せばよい。
尚取り出した多孔質四弗化エチレン樹脂からな
る焼成体６は必要に応じて切断切削等の加工を行
なえばよい。
この製造工程において四弗化エチレン樹脂の短
繊維材２に加わる負荷荷重が金属製押板３とおも
り４とを合せても10〜500Kg／m2即ち１〜50ｇ／
cm2という非常識な程極めて低い荷重で済み、しか
もこの低い荷重を調整することによつて、多孔質
度合を示す空隙率ｅ（ｅ＝１−測定密度／真比
重）をコントロールできる。そのため加圧装置と
しては強力で大がかりなものを全く必要とせず、
しかも金属製容器１としても丈夫なものを必要と
せず、従つて製造設備に費用がかかることがな
い。
このようにして得られた製品は四弗化エチレン
樹脂の短繊維材２が多孔構造となつて互に強固に
結合した状態となつており高い弾性を有するとと
もに引張り、圧縮に対する強度もすぐれている。
因みに、前述した本発明の製法によつて得られ
る製品のホツトコイニング圧力と密度および空隙
率との関係を下表に示す。
This invention is a method for manufacturing a fired body made of porous tetrafluoroethylene resin that has excellent chemical resistance, heat resistance, etc. and can be widely used as bags, gaskets, bearings, sound insulation, vibration isolating materials, filters, heat resistant materials, etc. It is related to. Conventionally, methods for manufacturing this type of porous material include a method of press-molding and sintering tetrafluoroethylene resin powder, and a method of manufacturing nonwoven fabrics, felts, etc. from tetrafluoroethylene resin fibers. A method similar to the so-called paper-making method in which the fibers are heated in a wet state and repeatedly compressed to entangle the fibers and harden them is known. However, in the case of the former method, since the powder of tetrafluoroethylene resin is sintered, the finished product is hard and has no elasticity, and it is impossible to control the porosity, which indicates the degree of porosity. There were drawbacks such as limited range. Furthermore, since it is a powder, it is necessary to generate a high surface pressure of, for example, 300 kg/cm 2 for sintering, which requires a powerful pressurizing device and, in addition, a mold with high strength. The drawbacks were that the equipment was expensive and the manufacturing costs were high. In addition, in the case of the latter method, the fibers are only intertwined and the individual fibers are not bonded together, so the resulting product has disadvantages such as being weak and having low tensile strength and compressive strength. It is a complicated manufacturing method because it requires repeated steps, and like the former, it had the fatal drawback of being unable to control the porosity. Therefore, the present invention mainly uses short fiber material of unfired tetrafluoroethylene resin, and uses this short fiber material with extremely low surface pressure, which is unthinkable in the conventional hot coining method. The present invention aims to provide a method for producing a fired body made of porous tetrafluoroethylene resin that solves the above-mentioned drawbacks at once by hot-coining the porous polytetrafluoroethylene resin at a temperature higher than the temperature at which it becomes amorphous (firing temperature). be. Hereinafter, the manufacturing process of a fired body made of porous tetrafluoroethylene resin of the present invention will be explained based on the drawings. First, short fiber material 2 of unburned tetrafluoroethylene resin having a length of 1 to 5 mm is uniformly filled into a metal container 1 having a desired shape and a smooth surface, and then a desired density is formed on the upper surface thereof. A dead weight 4 like this is loaded via a metal press plate 3 with a smooth surface. In this case, the load of the weight may be adjusted according to the porosity of the product to be manufactured, for example, if the porosity is increased, it is lighter, and if the porosity is decreased, it is heavier. may range from 0 to 500 Kg/m 2 or from 0 to 50 g/cm 2 . Note that the weight of the metal push plate 3 itself is approximately 1 g per 1 cm 2 . Next, hot coining is carried out for 2 hours in a furnace 5 maintained at a temperature of 350 to 380 degrees Celsius, at which the tetrafluoroethylene resin preferably maintains an amorphous state. When this is further released, a fired body 6 made of porous tetrafluoroethylene is obtained, which can be taken out from the metal container 1. Note that the fired body 6 made of porous tetrafluoroethylene resin that has been taken out may be subjected to processing such as cutting as necessary. In this manufacturing process, the load applied to the short fiber material 2 of tetrafluoroethylene resin is 10 to 500 kg/m 2 even if the metal push plate 3 and weight 4 are combined, that is, 1 to 50 g/ m2 .
An extremely low load of cm 2 is required, and by adjusting this low load, the porosity e (e=1−measured density/true specific gravity), which indicates the degree of porosity, can be controlled. Therefore, there is no need for a powerful and large-scale pressurizing device.
Furthermore, the metal container 1 does not need to be durable, and therefore the manufacturing equipment does not require any expense. The product thus obtained has a porous structure in which the short fibers 2 of tetrafluoroethylene resin are firmly bonded to each other, and has high elasticity and excellent tensile and compressive strength. . Incidentally, the table below shows the relationship between the hot coining pressure, density and porosity of the product obtained by the above-mentioned manufacturing method of the present invention.
【表】
このように本発明に従えば、多孔質の度合を示
す空隙率ｅを自由にコントロールできる。しかも
得られた製品自体も本発明者が知り得る範囲で
は、従来に全くない性状をしており、丁度軽石の
如く外観を有しスポンジのような弾性をもつとこ
ろの多孔質四弗化エチレン樹脂である。
また疎水性を有し吸水率の小さいものとなつて
いる。
しかも、本発明では、１〜５mmという短繊維を
用いているので、前述したホツトコイニングの圧
力に極めて敏感に応答するため、空隙率を完全に
コントロールできる重要な要因となしている。
尚、短繊維材２としては短繊維でよいから四弗
化エチレン樹脂の廃材を解砕したものが使用でき
るので、簡便な製造工程に加えて、安価な原材料
にも適用でき、製造コストを著しく低減できる。
尚、上記実施例では繊維材として四弗化エチレ
ン樹脂のみを使用した場合について説明したが、
四弗化エチレン樹脂に石綿等の無機繊維を添加し
たものを使用してもよい。
この場合製造された製品は強度及び耐熱性等に
すぐれたものとなる。
以上実施例に示すように本発明の製造方法によ
れば四弗化エチレン樹脂の短い繊維材を焼成する
ようにしたので１〜50ｇ／cm2という驚く程の低い
圧力での製造ができ大型の製品を作る場合でも大
きな加圧装置を必要とせず、しかも容器自体も大
きな圧力が付加されないので高強度のものを全く
必要とせず、従つて製造設備に費用が嵩まず安価
に製造できる。[Table] According to the present invention, the porosity e indicating the degree of porosity can be freely controlled. Moreover, the obtained product itself, to the best of the inventor's knowledge, has properties that are completely unprecedented, and is a porous tetrafluoroethylene resin that has an appearance exactly like pumice and has elasticity like a sponge. It is. It is also hydrophobic and has a low water absorption rate. Moreover, in the present invention, since short fibers of 1 to 5 mm are used, they respond extremely sensitively to the pressure of hot coining, which is an important factor in completely controlling the porosity. In addition, as the short fiber material 2, short fibers can be used, such as crushed waste materials of tetrafluoroethylene resin, so in addition to the simple manufacturing process, it can be applied to inexpensive raw materials, and the manufacturing cost can be significantly reduced. Can be reduced. In addition, in the above example, the case where only tetrafluoroethylene resin was used as the fiber material was explained.
A tetrafluoroethylene resin to which inorganic fibers such as asbestos are added may also be used. In this case, the manufactured product will have excellent strength, heat resistance, etc. As shown in the examples above, according to the production method of the present invention, short fibers of tetrafluoroethylene resin are fired, so production can be performed at surprisingly low pressures of 1 to 50 g/ cm2 , and large-sized Even when manufacturing a product, a large pressurizing device is not required, and since the container itself is not subjected to large pressure, there is no need for a high-strength product at all, and therefore manufacturing equipment can be manufactured at low cost without increasing costs.
図面は本発明の多孔質四弗化エチレン樹脂から
なる焼成体の製造工程を示す説明図である。
１……金属製容器、２……四弗化エチレン樹脂
の繊維材。
The drawings are explanatory diagrams showing the manufacturing process of a fired body made of porous tetrafluoroethylene resin of the present invention. 1...Metal container, 2...Tetrafluoroethylene resin fiber material.
Claims (1)
樹脂の短繊維材を容器に充填し、該繊維材に１〜
50ｇ／cmの低面圧を負荷した状態で且つ350〜380
度Ｃの非結晶状態下の温度でホツトコイニングす
ることを特徴とする多孔質四弗化エチレン樹脂か
らなる焼成体の製造方法。1 Fill a container with short fiber material of unfired tetrafluoroethylene resin with a fiber length of 1 to 5 mm, and fill the fiber material with 1 to 5 mm of short fiber material.
350 to 380 while applying a low surface pressure of 50g/cm
1. A method for producing a fired body made of porous tetrafluoroethylene resin, characterized by hot coining at a temperature in an amorphous state of degrees Celsius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7518978A JPS552060A (en) | 1978-06-20 | 1978-06-20 | Porous tetrafluoroethylene resin and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7518978A JPS552060A (en) | 1978-06-20 | 1978-06-20 | Porous tetrafluoroethylene resin and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS552060A JPS552060A (en) | 1980-01-09 |
| JPS6221819B2 true JPS6221819B2 (en) | 1987-05-14 |
Family
ID=13568995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7518978A Granted JPS552060A (en) | 1978-06-20 | 1978-06-20 | Porous tetrafluoroethylene resin and its preparation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS552060A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0000712D0 (en) | 2000-01-14 | 2000-03-08 | Flexitallic Ltd | Gasket |
| GB0114669D0 (en) | 2001-06-15 | 2001-08-08 | Btg Int Ltd | Amorphous polymer articles |
| GB0116441D0 (en) * | 2001-07-05 | 2001-08-29 | Flexitallic Ltd | Process for production of vermiculite foil |
| GB0500470D0 (en) | 2005-01-11 | 2005-02-16 | Flexitallic Ltd | A gasket material and its process of production |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51132277A (en) * | 1976-03-08 | 1976-11-17 | Nippon Oil Seal Ind Co Ltd | Method of forming water repellent porous film and film having substantially no pinhole on substrate |
-
1978
- 1978-06-20 JP JP7518978A patent/JPS552060A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51132277A (en) * | 1976-03-08 | 1976-11-17 | Nippon Oil Seal Ind Co Ltd | Method of forming water repellent porous film and film having substantially no pinhole on substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS552060A (en) | 1980-01-09 |
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