JPS62247869A - Production of plastic tank having liquid impermeability - Google Patents
Production of plastic tank having liquid impermeabilityInfo
- Publication number
- JPS62247869A JPS62247869A JP9258786A JP9258786A JPS62247869A JP S62247869 A JPS62247869 A JP S62247869A JP 9258786 A JP9258786 A JP 9258786A JP 9258786 A JP9258786 A JP 9258786A JP S62247869 A JPS62247869 A JP S62247869A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- barrier layer
- nylon
- liquid
- plasma
- 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
- 239000004033 plastic Substances 0.000 title claims abstract description 22
- 229920003023 plastic Polymers 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 230000004888 barrier function Effects 0.000 claims abstract description 21
- 239000004677 Nylon Substances 0.000 claims abstract description 20
- 229920001778 nylon Polymers 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 238000009832 plasma treatment Methods 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 abstract description 5
- 239000011347 resin Substances 0.000 abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000003502 gasoline Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、液体不透過性を有するプラスチックタンクの
製造方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improvement in a method for manufacturing a liquid-impermeable plastic tank.
（従来の技術）
一般に、プラスチックは軽量でしかも成形の自由度が大
きいことから各種の産業分野において利用されているが
、反面、液体が透過し易いという欠点を有しており、そ
のため液体を貯蔵する容器例えば自動車等車両のガンリ
ンタンクをプラスデックで成形する場合には、ガソリン
の透過を阻止するためにタンク内面に例えばエポキシ樹
脂等を塗布して液体不透過性の膜つまりバリヤ層を形成
している。そして、通常、ガソリンタンクは強度剛性が
要求されるため機械的強度に優れたプラスチック例えば
高密度ポリエチレン、ポリプロピレン等のポリオレフィ
ン系の樹脂が使用されているが、ポリオレフィン系の樹
脂は極性か小さいため接着性に欠けるきらいがある。し
たがって、この欠点を改良すべく例えばタンク内面をフ
ッ素処理することによりバリヤ層の接着性を向上せしめ
るようにしている。一方、多層ブロー成形法によりナイ
ロン等不透過性に優れた樹脂を中間層として介在せしめ
てサンドイッヂ構造にする方法もある。(Prior art) Plastics are generally used in various industrial fields because they are lightweight and have a high degree of freedom in molding. However, on the other hand, they have the disadvantage of being easily permeable to liquids, so they cannot be used to store liquids. For example, when molding a Ganlin tank for a vehicle such as an automobile using Plus Deck, the inner surface of the tank is coated with, for example, epoxy resin to form a liquid-impermeable film or barrier layer to prevent gasoline from permeating. are doing. Gasoline tanks usually require strength and rigidity, so plastics with excellent mechanical strength, such as polyolefin resins such as high-density polyethylene and polypropylene, are used, but polyolefin resins are polar or small, so they cannot be bonded. I tend to lack sex. Therefore, in order to improve this drawback, for example, the inner surface of the tank is treated with fluorine to improve the adhesion of the barrier layer. On the other hand, there is also a method of creating a sandwich structure by interposing a resin with excellent impermeability such as nylon as an intermediate layer using a multilayer blow molding method.
ところが、上記の前者の方法ではフッ素カスを使用する
ため作業環境上好ましくなく、また、後者の方法では多
層成形であるため成形装置が複雑化するという問題があ
った。However, the former method uses fluorine sludge, which is unfavorable in terms of the working environment, and the latter method requires multilayer molding, making the molding equipment complicated.
そこで、上記のこれらの方法とは別の方法として、例え
ば特開昭５６−８１３４４号公報に開示されているよう
に、プラスチック製のガソリンタンクの内面をプラズマ
処理して、タンクを構成しているプラスチックの極性基
を活性化せしめ、これによりタンクに対するエポキシ樹
脂の接着性を良好ならしめてタンク内面にバリヤ層を形
成するようにする方法が知られている。Therefore, as a method different from the above-mentioned methods, for example, as disclosed in Japanese Patent Application Laid-Open No. 56-81344, the inner surface of a plastic gasoline tank is treated with plasma to construct the tank. It is known to activate the polar groups of the plastic, thereby improving the adhesion of the epoxy resin to the tank and forming a barrier layer on the inner surface of the tank.
（発明が解決しようとする問題点）
ところが、上記の従来の方法により製造されたガソリン
タンクのバリヤ層はエポキシ樹脂でもって形成されてい
るため可撓性に乏しく、外部から衝撃か加わるとバリヤ
層にクラックが生じてこのクラック発生箇所からガソリ
ンが染み込んでガソリンタンクに透過してしまうという
問題があった。(Problems to be Solved by the Invention) However, since the barrier layer of the gasoline tank manufactured by the above-mentioned conventional method is formed of epoxy resin, it has poor flexibility, and if an external impact is applied, the barrier layer will break. There was a problem in that cracks formed in the fuel tank and gasoline seeped through the cracks and permeated into the gasoline tank.
本発明はかかる点に鑑みてなされたものであり、その目
的とするところは、プラスチックタンク内面のバリヤ層
を構成する樹脂を特定することにより、塗布形成される
バリヤ層に不透過性および可撓性の双方の特性を備えせ
しめ、これにより上記バリヤ層はタンクに外部から衝撃
が加わってもこの衝撃を吸収緩和してクラックか生ずる
ことがなく、よって液体不透過性を長期に亘って安定し
て保持し得るプラスチックタンクを得んとすることにあ
る。The present invention has been made in view of these points, and its purpose is to provide impermeability and flexibility to the applied barrier layer by specifying the resin constituting the barrier layer on the inner surface of the plastic tank. As a result, even if the tank is subjected to an external impact, the barrier layer absorbs and alleviates the impact and does not cause cracks, thus maintaining stable liquid impermeability over a long period of time. The objective is to obtain a plastic tank that can be held in place.
（問題点を解決するための手段）
上記の目的を達成するため、本発明の解決手段は、まず
、プラスチックタンクの内面をプラズマ処理する。その
後、該プラスチックタンク内面に液体溶融ナイロンを塗
布し、しかる後、乾燥工程を経ることにより液体溶融ナ
イロン中の液体を揮発せしめて液体不透過性のバリヤ層
を形成したプラスデックタンクを得る方法にする。(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention first plasma-treats the inner surface of a plastic tank. Thereafter, liquid fused nylon is applied to the inner surface of the plastic tank, and then a drying process is performed to volatilize the liquid in the liquid fused nylon to form a liquid-impermeable barrier layer. do.
（作用）
上記の構成により、本発明では、プラスチックタンクの
内面はプラズマ処理により極性基が活性化され、これに
よりタンク内面に塗布形成される液体溶融ナイロンのバ
リヤ層の接着性が向上せしめられる。(Function) With the above configuration, in the present invention, the polar groups on the inner surface of the plastic tank are activated by plasma treatment, thereby improving the adhesion of the liquid-melted nylon barrier layer coated on the inner surface of the tank.
このバリヤ層は不透過性および可撓性の双方の特性を備
えていることから、タンクに外部から衝撃が加わっても
この衝撃を吸収緩和してクラックが生ずることかなく、
したがってバリヤ層を例えばエポキシ樹脂等の熱硬化性
樹脂で構成した場合に比べて液体不透過性を長期に亘っ
て安定して保持し得るプラスチックタンクが得られるこ
ととなる。This barrier layer is both impermeable and flexible, so even if an external impact is applied to the tank, it absorbs and cushions the impact, preventing cracks from forming.
Therefore, a plastic tank can be obtained that can stably maintain liquid impermeability over a long period of time compared to a case where the barrier layer is made of a thermosetting resin such as an epoxy resin.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図は本発明方法に使用するプラズマ処理装置を示し
、該装置はプラスチックタンクとしてのガソリンタンク
Ｗの内面を活性化してバリヤ層としての液体溶融ナイロ
ンの接着性を良好ならしめるための前処理工程に使用さ
れる。FIG. 1 shows a plasma treatment apparatus used in the method of the present invention, which is used for pretreatment to activate the inner surface of a gasoline tank W as a plastic tank to improve the adhesion of liquid-melted nylon as a barrier layer. used in the process.
まず、プラズマ処理すべき複数（図では３個）の高密度
ポリエチレン類のガソリンタンクＷ、Ｗ。First, a plurality (three in the figure) of high-density polyethylene gasoline tanks W, W are to be subjected to plasma treatment.
Ｗを第１コンベア１からチャンバ２内の第２コンベア３
に移載し、酸素ボンベ４のバルブ５および酸素供給通路
６に介設された流量調整バルブ７゜＝ ５−
７．７を開いてプラズマ発生炉８．８．８に酸素を供給
する。該各プラズン発生炉８にはマイクロ波発振器９が
並設されていて、該各マイクロ波発振器９から上記各プ
ラズマ発生炉８内に出力１゜２ＫＷ、周波数２．４５Ｇ
Ｈｚの条件下で発振されたマイクロ波により酸素をプラ
ズマ化させる。W from the first conveyor 1 to the second conveyor 3 in the chamber 2
The valve 5 of the oxygen cylinder 4 and the flow rate adjustment valve 7°=5-7.7 provided in the oxygen supply passage 6 are opened to supply oxygen to the plasma generation furnace 8.8.8. A microwave oscillator 9 is installed in parallel to each plasma generating furnace 8, and an output of 1°2 KW and a frequency of 2.45 G is transmitted from each microwave oscillator 9 into each plasma generating furnace 8.
Oxygen is turned into plasma by microwaves oscillated under Hz conditions.
このプラズマ化した酸素を上記チャンバ２内に臨む各プ
ラズマ発生炉８下端に接続されたテフロン製のプラズマ
導入ホース１０を介して上記各ガソリンタンクＷのフロ
ート孔よりタンクＷ内に導入する。この際、真空ポンプ
１１およびブースタポンプ１２に通じる減圧用配管１３
に介設された流量調整バルブ１４．’１４．１４を開い
て上記両ポンプ１１，１２の作動により上記チャンバ２
内の気圧が０．５〜５ｉｏｒｒになるよう真空引きし、
この状態で６０秒間に亘って上記ガソリンタンクＷの内
面をプラズマ処理する。なお、この真空引きの要領は、
まず、バイパス通路１６に介設されたバルブ１７を開い
て真空ポンプ１１のみで真空引ぎし、真空度が所定値に
達すると、今度は真空ポンプ１１およびブースタポンプ
１２の両ポンプの作動により真空引きするようにする。This plasma-formed oxygen is introduced into the tank W through the float hole of each gasoline tank W via a Teflon plasma introduction hose 10 connected to the lower end of each plasma generating furnace 8 facing into the chamber 2. At this time, the pressure reduction piping 13 leading to the vacuum pump 11 and the booster pump 12
A flow rate adjustment valve 14. '14.14 is opened and the chamber 2 is activated by the operation of both the pumps 11 and 12.
Vacuum the inside to a pressure of 0.5 to 5 iorr,
In this state, the inner surface of the gasoline tank W is subjected to plasma treatment for 60 seconds. The details of this vacuuming process are as follows:
First, the valve 17 installed in the bypass passage 16 is opened to draw a vacuum using only the vacuum pump 11. When the degree of vacuum reaches a predetermined value, the vacuum is drawn by operating both the vacuum pump 11 and the booster pump 12. I'll do what I do.
その後、プラズマ処理済の各ガソリンタンクＷを上記チ
ャンバ２から第３コンベア１５により搬出し、今度は各
タンクＷ内面に例えばアルコール可溶の濃度２０％に設
定された液体溶融ナイロン（商品名 Ａ−５７２０東し
く株））を塗布し、肉厚５簡のナイロン層を形成する。Thereafter, each plasma-treated gasoline tank W is carried out from the chamber 2 by the third conveyor 15, and this time, the inner surface of each tank W is coated with liquid melted nylon (trade name A-) with a concentration of 20% alcohol-soluble, for example. 5720 Toshiku Co., Ltd.)) to form a nylon layer with a thickness of 5 strips.
このナイロン層の形成要領は、例えばタンクＷ内に上記
液体溶融ナイロンを注入し、フロート孔およびガソリン
注入口をシールした状態で上記タンクＷを揺り動かすこ
とにより、液体溶融ナイロンのタンクＷ内面への付着を
均一化せしめる。The procedure for forming this nylon layer is, for example, by injecting the liquid molten nylon into the tank W and rocking the tank W with the float hole and gasoline inlet sealed, so that the liquid molten nylon adheres to the inner surface of the tank W. to make it uniform.
このようにしてタンクＷ内面に肉厚の均一なナイロン層
が形成されると、このタンクＷを乾燥炉に導き、乾燥温
度８０℃、乾燥時間１０分の条件下で加熱乾燥し、これ
により上記タンクＷ内面に形成されたナイロン層中のア
ルコールを揮発せしめて液体不透過性のナイロン層のバ
リヤ層を形成する。When a nylon layer with a uniform thickness is formed on the inner surface of the tank W in this way, the tank W is led to a drying oven and heated and dried under the conditions of a drying temperature of 80°C and a drying time of 10 minutes. The alcohol in the nylon layer formed on the inner surface of the tank W is volatilized to form a liquid-impermeable nylon barrier layer.
このようにして得られたガンリンタンクＷのカッリン透
過度を、従来のガソリンタンクと比較すると、第２図に
示すように、従来例のものでは常温で２１日後にはカッ
リン透過度が約１２３になったか、本実施例のものでは
ほとんど透過度に変化はみられなかった。また、その後
、引き続いて今度は雰囲気温度４０’Ｃの条件下で１日
８時間放置すると、従来例のものでは透過度が２９日後
には約２４９になったが、この場合においても本実施例
のものではほとんど透過度に変化はみられず、約０．０
１〜０．０２ｇＬか透過しなかった。Comparing the Karin permeability of the Ganlin Tank W obtained in this manner with that of a conventional gasoline tank, as shown in Fig. 2, the Karrin permeability of the conventional example was approximately 123 after 21 days at room temperature. There was almost no change in transmittance in the case of this example. Furthermore, when the conventional example was left for 8 hours a day under the condition of an ambient temperature of 40'C, the transmittance was about 249 after 29 days, but in this case as well, the present example There was almost no change in the transmittance, about 0.0
Only 1 to 0.02 gL did not pass through.
なお、上記実施例では、プラスデックタンクがカッリン
タンクＷである場合を示したが、これに限らず、例えば
薬用ビン等芳＠族系の溶剤を収納するプラスチックタン
ク等にも適用てぎるものである。In addition, in the above embodiment, the case where the Plus Deck tank is Karin Tank W is shown, but the present invention is not limited to this, and can also be applied to, for example, plastic tanks for storing aromatic solvents such as medicinal bottles. .
（発明の効果）
以上説明したように、本発明方法によれば、プラスチッ
クタンクの内面をプラズマ処理し、次いで該プラスチッ
クタンク内面に液体溶融ナイロンを塗布したのち乾燥工
程を経ることにより液体溶融ナイロン中の液体を揮発せ
しめてバリヤＭを形成するようにしたので、該バリヤ層
は不透過性および可撓性の双方の特性を備えたものとな
り、よってタンクに外部から衝撃が加わってもクラック
が生ずことがなく、したがって例えばエポキシ樹脂等の
熱硬化性樹脂で構成した場合に比べて液体不透過性を長
期に亘って安定して保持し得るプラスチックタンクを得
ることができる。(Effects of the Invention) As explained above, according to the method of the present invention, the inner surface of a plastic tank is subjected to plasma treatment, the inner surface of the plastic tank is coated with liquid molten nylon, and then a drying process is performed. Since the liquid in the tank is volatilized to form the barrier M, the barrier layer is both impermeable and flexible, so even if an impact is applied to the tank from the outside, no cracks will occur. Therefore, it is possible to obtain a plastic tank that can stably maintain liquid impermeability over a long period of time, compared to a case where the plastic tank is made of a thermosetting resin such as an epoxy resin.
【図面の簡単な説明】
第１図は本発明方法に使用するプラズマ処理装置を示す
概略構成図、第２図は本実施例のガソリンタンクと従来
例のガソリンタンクとのガソリン透過度を比較するグラ
フである。
Ｗ・・・ガソリンタンク。[Brief Description of the Drawings] Figure 1 is a schematic configuration diagram showing a plasma processing apparatus used in the method of the present invention, and Figure 2 compares the gasoline permeability between the gasoline tank of this embodiment and a conventional gasoline tank. It is a graph. W...Gasoline tank.
Claims (1)
いで該プラスチックタンク内面に液体溶融ナイロンを塗
布したのち乾燥工程を経ることにより液体溶融ナイロン
中の液体を揮発せしめて液体不透過性のバリヤ層を形成
することを特徴とする液体不透過性を有するプラスチッ
クタンクの製造方法。(1) Plasma treat the inner surface of the plastic tank, then apply liquid fused nylon to the inner surface of the plastic tank, and then go through a drying process to volatilize the liquid in the liquid fused nylon to form a liquid-impermeable barrier layer. A method for producing a liquid-impermeable plastic tank, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9258786A JPS62247869A (en) | 1986-04-22 | 1986-04-22 | Production of plastic tank having liquid impermeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9258786A JPS62247869A (en) | 1986-04-22 | 1986-04-22 | Production of plastic tank having liquid impermeability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62247869A true JPS62247869A (en) | 1987-10-28 |
Family
ID=14058572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9258786A Pending JPS62247869A (en) | 1986-04-22 | 1986-04-22 | Production of plastic tank having liquid impermeability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62247869A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005185889A (en) * | 2003-12-24 | 2005-07-14 | Mitsubishi Gas Chem Co Inc | Method for manufacturing fuel container, fuel system component and/or joint part excellent in gasoline barrier |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6169843A (en) * | 1984-09-13 | 1986-04-10 | Isuzu Motors Ltd | Method for coating resin molding |
| JPS6175546A (en) * | 1984-09-21 | 1986-04-17 | Toshiba Corp | Marking pre-processing method of semiconductor plastic package |
-
1986
- 1986-04-22 JP JP9258786A patent/JPS62247869A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6169843A (en) * | 1984-09-13 | 1986-04-10 | Isuzu Motors Ltd | Method for coating resin molding |
| JPS6175546A (en) * | 1984-09-21 | 1986-04-17 | Toshiba Corp | Marking pre-processing method of semiconductor plastic package |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005185889A (en) * | 2003-12-24 | 2005-07-14 | Mitsubishi Gas Chem Co Inc | Method for manufacturing fuel container, fuel system component and/or joint part excellent in gasoline barrier |
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