JP4273639B2 - Cleaning method - Google Patents

Cleaning method Download PDF

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Publication number
JP4273639B2
JP4273639B2 JP2000203741A JP2000203741A JP4273639B2 JP 4273639 B2 JP4273639 B2 JP 4273639B2 JP 2000203741 A JP2000203741 A JP 2000203741A JP 2000203741 A JP2000203741 A JP 2000203741A JP 4273639 B2 JP4273639 B2 JP 4273639B2
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Japan
Prior art keywords
cleaning
solvent
jig
raw material
thioepoxy
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Expired - Fee Related
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JP2000203741A
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Japanese (ja)
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JP2002018863A (en
JP2002018863A5 (en
Inventor
克彦 宮本
賢一 登内
徹 斉藤
修二 内藤
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Seiko Epson Corp
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Seiko Epson Corp
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  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Detergent Compositions (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は洗浄用の溶剤及び方法に関する。詳しくは、チオエポキシ系プラスチック原料が付着した治具等を洗浄する溶剤及び洗浄方法に関する。更に詳しくは、プラスチックの注型成形を行う工程において、原料の調合・注入を行ったタンク・配管・治具等を洗浄する溶剤及び洗浄方法に関する。
【0002】
【従来の技術】
プラスチック原料は、プラスチックとしての性能を得るため、各種成分を混合し(調合)、調合された原料を必要な形状の型(注型)に流し込み(注入)、冷却、加熱またはエネルギー照射によって成形される。
【0003】
プラスチックの原料は、調合、注入の工程の中でさまざまな、調合用のタンク、配管、治具、注入用の配管、ノズル、あるいはドラフトチャンバー等(以下治具等)に付着してしまう。治具等に付着した原料は、放置するとモノマーの反応が起こりゲル化がはじまり、最終的には硬化してしまう。
【0004】
治具等に付着したプラスチックの原料を硬化させずに治具等を繰り返し使用するためには洗浄が必要となる。
【0005】
また、洗浄に使用する溶剤が原料に混入してしまった場合、プラスチックとしての性能を損なう可能性がある。原料への溶剤の混入を防ぐため、速やかかつ残渣なく乾燥する必要がある。洗浄される治具等は、構造が複雑であったり配管として固定されてしまっているため、乾燥炉等で乾燥することができない。したがって、洗浄に使用する溶剤は、乾燥性も要求される。
【0006】
前述の洗浄性、乾燥性を満足するプラスチック原料付着治具の洗浄に使用される溶剤は、ハロゲン系溶剤のジクロロメタン(塩化メチレン)、トリクロロエチレン(トリクレン)、フロンおよび、N−メチル−2−ピロリドリン(NMP)、ジメチルホルムアミド(DMF)、メチルエチルケトン、アセトン、シンナーなどである。
【0007】
【発明が解決しようとする課題】
しかしながら、上述した溶剤を使用する従来の洗浄方法にはいくつかの問題点がある。
【0008】
ジクロロメタンやトリクロロエチレン、フロン等のハロゲン系有機溶剤は、分子中に塩素をはじめとしたハロゲンを含み、引火性が無く、安定した物質である。
【0009】
しかし、塩素系の溶剤は、毒性が強く、一部では発癌性の疑いもあり、人体に対する安全性に問題がある。また、ハロゲン系有機溶剤全体の傾向として安定な物質が多く、大気中や地中においても分解されにくい。地下浸透や排水中に混入したものについては、土壌や河川に残留し、環境破壊を起こす。一方、大気中に放出したものは、大気中に長期間存在し、分解されずに成層圏に達し、オゾン破壊や温暖化の原因になっており、社会問題となっている。
【0010】
プラスチック原料付着治具の洗浄においては、被洗浄物のサイズが大きかったり、作業を手で行っているため、密閉式の洗浄装置等で洗浄することが不可能であり、開放状態で使用している限り、人体への吸収や大気等への放出につながり、健康や環境に対する影響が生じてしまう。
【0011】
N−メチル−2−ピロリドリン(NMP)、ジメチルホルムアミド(DMF)等の溶剤は、洗浄性には問題ないが、チオエポキシ系原料の洗浄においては、触媒として作用してしまうため、洗浄剤としては使用できない。
【0012】
アセトン、イソプロピルアルコール等の溶剤は、チオエポキシ系プラスチック原料の洗浄においては洗浄性に問題があり、洗浄剤としては使用できない。
【0013】
【課題を解決するための手段】
本発明者らは上記課題を解決すべく鋭意研究を行った結果、チオエポキシ系原料の洗浄においては、環境に影響が無く、洗浄性を満足し、触媒として作用しない洗浄方法を発明した。
【0014】
請求項1記載の発明は、チオエポキシ系プラスチック原料が付着した治具を、テトラヒドロフランからなる洗浄用溶剤で洗浄することを特徴とする洗浄方法を提供する。
【0015】
請求項2記載の発明は、前記チオエポキシ系プラスチック原料が付着した治具を、前記テトラヒドロフランからなる洗浄用溶剤に浸漬することを特徴とする請求項1記載の洗浄方法を提供する。
【0016】
請求項3記載の発明は、前記チオエポキシ系プラスチック原料が付着した治具に、前記テトラヒドロフランからなる洗浄用溶剤を掛け流し洗浄することを特徴とする請求項1記載の洗浄方法を提供する。
【0017】
請求項4記載の発明は、前記チオエポキシ系プラスチック原料が付着した治具を、前記テトラヒドロフランからなる洗浄用溶剤を染込ませたウエスまたはスポンジで拭き取りを行うことを特徴とする請求項1記載の洗浄方法を提供する。
【0024】
本発明においては、ハロゲン原子を含まない分子構造を持つ溶剤を使用するため、オゾン破壊がほとんど無い。地球温暖化への影響が無く、地球環境にやさしい洗浄が可能になる。
【0025】
蒸気圧が30mmHg以上にすることによって、乾燥が容易になり、さらに望ましくは40mmHg以上にすると、乾燥がより容易になり、残渣の無い洗浄が可能になる。
【0026】
上記洗浄用溶剤を使用すると、洗浄方法として、被洗浄物の形状により異なるが、洗浄用溶剤に浸漬したり、洗浄用溶剤を掛け流したり、洗浄用溶剤をウエス等に染み込ませて拭き取りすることにより被洗浄汚れの洗浄が可能となる。また、洗浄用溶剤の浸漬洗浄に超音波を印加することにより、洗浄効果が上がる。
【0027】
【発明の実施の形態】
以下本発明の実施の形態について説明するが、本発明は、下記の実施の形態に制限されるものではない。
【0028】
[実施例1]
チオエポキシ系プラスチックメガネレンズの原料調合、注入工程を例に説明する。
【0029】
図1に示すような調合装置を用いて、プラスチックメガネレンズの原料を調合する。原料タンク1に主原料と添加剤を別々に貯え、配管2を通して、調合タンク3内で混合し、攪拌器4で攪拌を行う。調合後の原料を図2に示すような注入装置の送液タンク5に移送し、加圧することにより注入用配管6を通して、ドラフトチャンバー9内で注入ノズル7を使用し成形用注型8に原料を注入する。これら一連の工程において、調合に使用する調合タンク3をはじめ、注入用配管6等をテトラヒドロフランで洗浄を行った。
【0030】
洗浄方法:調合タンク3は、タンク内に洗浄用溶剤を溜め攪拌器4で攪拌後、液を抜き取る。その後、調合タンク3内の側壁や攪拌器4等は、液をかけ流し、乾燥エアを導入し1時間放置する。注入装置は、送液タンク5に洗浄用溶剤を入れ、溶剤を圧空にて送液し、注入用配管6を通し、注入ノズル7の出口にて洗浄用溶剤を回収する。送液洗浄後、乾燥エアを送液タンク5と注入用配管6内に通し、1時間放置する。ドラフトチャンバー9内の汚れは、ウエス等に洗浄用溶剤を染み込ませ、拭き取りで洗浄する。
【0031】
[比較例1]
洗浄溶剤として、アセトンを用いて、実施例1と同様の方法で洗浄を行った。
【0032】
[比較例2]
洗浄溶剤として、イソプロピルアルコールを用いて、実施例1と同様の方法で洗浄を行った。
【0033】
[比較例3]
洗浄溶剤として、 N−メチル−2−ピロリドリン(NMP)を用いて、実施例1と同様の方法で洗浄を行った。
【0034】
[比較例4]
洗浄溶剤として、 ジクロロメタン(塩化メチレン)を用いて、実施例1と同様の方法で洗浄を行った。
【0035】
実施例及び比較例の結果は表1のとおり。表中の◎は、使用上極めて良好な状態を示し、○は、使用上良好な状態を示し、×は、使用不可を示す。
【0036】
【表1】

Figure 0004273639
【0037】
実施例1に関しては、残渣なく汚染物の除去ができ、乾燥ができ、触媒作用がないため、洗浄に使用できる。
【0038】
比較例1に関しては、 汚染物の除去ができず、また触媒としても作用するため、洗浄には使用できない。
【0039】
比較例2に関しては、汚染物の除去ができず、洗浄には使用できない。
比較例3に関しては残渣なく汚染物の除去ができるものの、乾燥できず、また触媒としても作用するため、洗浄には使用できない。
比較例4に関しては残渣なく汚染物の除去ができるものの、安全性(環境への影響)に問題があり使用できない。
【0040】
【発明の効果】
本発明の洗浄方法によれば、塩素系溶剤を使用せずに、チオエポキシ系プラスチック原料付着治具の洗浄品質を保ちながら、環境にやさしい洗浄を行うことができる。
【図面の簡単な説明】
【図1】調合装置の概要図を示している。
【図2】注入装置の概要図を示している。
【符号の説明】
1 原料タンク
2 配管
3 調合タンク
4 攪拌器
5 送液タンク
6 注入用配管
7 注入ノズル
8 成形用注型
9 ドラフトチャンバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to cleaning solvents and methods. Specifically, the present invention relates to a solvent and a cleaning method for cleaning a jig or the like to which a thioepoxy plastic material is attached. More specifically, the present invention relates to a solvent and a cleaning method for cleaning a tank, a pipe, a jig, and the like in which raw materials are mixed and injected in a plastic casting process.
[0002]
[Prior art]
In order to obtain plastic performance, plastic raw materials are formed by mixing various components (preparation), pouring the prepared raw materials into a mold of the required shape (casting), cooling, heating or energy irradiation. The
[0003]
Plastic raw materials adhere to various tanks, pipes, jigs, pipes for injection, nozzles, draft chambers, etc. (hereinafter referred to as jigs) during the blending and pouring processes. If the raw material adhering to the jig or the like is left as it is, the reaction of the monomer occurs, gelation starts, and eventually it hardens.
[0004]
In order to repeatedly use the jig or the like without curing the plastic material attached to the jig or the like, cleaning is required.
[0005]
Moreover, when the solvent used for washing | cleaning mixes with a raw material, the performance as a plastic may be impaired. In order to prevent mixing of the solvent into the raw material, it is necessary to dry quickly and without residue. Since the jig to be cleaned has a complicated structure or is fixed as a pipe, it cannot be dried in a drying furnace or the like. Therefore, the solvent used for cleaning is also required to be dry.
[0006]
Solvents used for cleaning the plastic raw material adhesion jig satisfying the above-described detergency and dryness are halogen solvents such as dichloromethane (methylene chloride), trichlorethylene (trichlene), chlorofluorocarbon, and N-methyl-2-pyrrolidolin ( NMP), dimethylformamide (DMF), methyl ethyl ketone, acetone, thinner and the like.
[0007]
[Problems to be solved by the invention]
However, there are some problems in the conventional cleaning method using the above-mentioned solvent.
[0008]
Halogen-based organic solvents such as dichloromethane, trichlorethylene, and chlorofluorocarbon contain a halogen such as chlorine in the molecule, are not flammable, and are stable materials.
[0009]
However, chlorinated solvents are highly toxic and in some cases are suspected to be carcinogenic, thus posing a problem for human safety. In addition, there are many stable substances as a whole of the halogen-based organic solvents, and they are not easily decomposed in the air or in the ground. Any material mixed in underground infiltration or drainage will remain in the soil and rivers, causing environmental damage. On the other hand, those released into the atmosphere exist in the atmosphere for a long time, reach the stratosphere without being decomposed, causing ozone destruction and global warming, which is a social problem.
[0010]
When cleaning plastic material attachment jigs, the size of the object to be cleaned is large or the work is done by hand, so it is impossible to clean with a closed type cleaning device, etc. As long as it is absorbed into the human body and released into the atmosphere, the health and the environment are affected.
[0011]
Solvents such as N-methyl-2-pyrrolidolin (NMP) and dimethylformamide (DMF) have no problem in cleaning properties, but they act as a catalyst in cleaning thioepoxy raw materials and are therefore used as cleaning agents. Can not.
[0012]
Solvents such as acetone and isopropyl alcohol have a problem in cleaning properties when cleaning thioepoxy plastic raw materials and cannot be used as cleaning agents.
[0013]
[Means for Solving the Problems]
As a result of diligent research to solve the above problems, the present inventors have invented a cleaning method that does not affect the environment, satisfies the cleanability, and does not act as a catalyst in cleaning the thioepoxy raw material.
[0014]
The invention described in claim 1 provides a cleaning method characterized in that a jig to which a thioepoxy plastic raw material is adhered is cleaned with a cleaning solvent made of tetrahydrofuran.
[0015]
According to a second aspect of the present invention, there is provided the cleaning method according to the first aspect, wherein the jig to which the thioepoxy plastic raw material is attached is immersed in the cleaning solvent made of tetrahydrofuran.
[0016]
According to a third aspect of the present invention, there is provided the cleaning method according to the first aspect, wherein the cleaning solvent made of tetrahydrofuran is poured over the jig to which the thioepoxy plastic raw material is adhered.
[0017]
Fourth aspect of the present invention, the jig the thioepoxy plastic material is attached, according to claim 1, characterized in that the wiping by the weather scan or sponge soaked with cleaning solvent consisting of the tetrahydrofuran A cleaning method is provided.
[0024]
In the present invention, since a solvent having a molecular structure not containing a halogen atom is used, there is almost no ozone destruction. There is no impact on global warming, and cleaning that is friendly to the global environment is possible.
[0025]
When the vapor pressure is 30 mmHg or more, drying becomes easy, and more desirably 40 mmHg or more, drying becomes easier and cleaning without residue becomes possible.
[0026]
When the above cleaning solvent is used, the cleaning method varies depending on the shape of the object to be cleaned, but it can be immersed in the cleaning solvent, sprayed with the cleaning solvent, or soaked in a waste cloth. This makes it possible to clean the dirt to be cleaned. Moreover, the cleaning effect is improved by applying ultrasonic waves to the immersion cleaning of the cleaning solvent.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.
[0028]
[Example 1]
The raw material preparation and injection process of a thioepoxy plastic eyeglass lens will be described as an example.
[0029]
The raw material of a plastic spectacle lens is prepared using a preparation apparatus as shown in FIG. The main raw material and the additive are separately stored in the raw material tank 1, mixed in the preparation tank 3 through the pipe 2, and stirred by the stirrer 4. The mixed raw material is transferred to a liquid feeding tank 5 of an injection apparatus as shown in FIG. 2 and pressurized to pass through an injection pipe 6 and then into a molding casting mold 8 using an injection nozzle 7 in a draft chamber 9. Inject. In these series of steps, the preparation tank 3 used for the preparation, the injection pipe 6 and the like were washed with tetrahydrofuran.
[0030]
Cleaning method: The preparation tank 3 stores a cleaning solvent in the tank, and after stirring with the stirrer 4, drains the liquid. Thereafter, the side walls in the preparation tank 3, the stirrer 4 and the like are poured with liquid, introduced with dry air, and left for 1 hour. The injection device puts a cleaning solvent into the liquid supply tank 5, sends the solvent by compressed air, passes the injection pipe 6, and collects the cleaning solvent at the outlet of the injection nozzle 7. After liquid feeding cleaning, dry air is passed through the liquid feeding tank 5 and the injection pipe 6 and left for 1 hour. The dirt in the draft chamber 9 is cleaned by wiping the cloth with a cleaning solvent.
[0031]
[Comparative Example 1]
Cleaning was performed in the same manner as in Example 1 using acetone as the cleaning solvent.
[0032]
[Comparative Example 2]
Cleaning was performed in the same manner as in Example 1 using isopropyl alcohol as the cleaning solvent.
[0033]
[Comparative Example 3]
Cleaning was performed in the same manner as in Example 1 using N-methyl-2-pyrrolidolin (NMP) as the cleaning solvent.
[0034]
[Comparative Example 4]
Washing was performed in the same manner as in Example 1 using dichloromethane (methylene chloride) as a washing solvent.
[0035]
Table 1 shows the results of Examples and Comparative Examples. In the table, ◎ indicates a very good state for use, ○ indicates a good state for use, and × indicates unusable.
[0036]
[Table 1]
Figure 0004273639
[0037]
Regarding Example 1, since contaminants can be removed without residue, drying is possible, and there is no catalytic action, it can be used for washing.
[0038]
As for Comparative Example 1, it cannot be used for cleaning because it cannot remove contaminants and also acts as a catalyst.
[0039]
Regarding Comparative Example 2, contaminants cannot be removed and cannot be used for cleaning.
In Comparative Example 3, although contaminants can be removed without residue, they cannot be dried and cannot be used for washing because they also act as a catalyst.
Regarding Comparative Example 4, although contaminants can be removed without residue, there is a problem in safety (influence on the environment) and it cannot be used.
[0040]
【The invention's effect】
According to the cleaning method of the present invention, it is possible to perform environmentally friendly cleaning without using a chlorine-based solvent while maintaining the cleaning quality of the thioepoxy-based plastic material adhesion jig.
[Brief description of the drawings]
FIG. 1 shows a schematic diagram of a compounding device.
FIG. 2 shows a schematic diagram of an injection device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Raw material tank 2 Piping 3 Preparation tank 4 Stirrer 5 Liquid feeding tank 6 Injection piping 7 Injection nozzle 8 Molding casting 9 Draft chamber

Claims (4)

チオエポキシ系プラスチック原料が付着した治具を、テトラヒドロフランからなる洗浄用溶剤で洗浄することを特徴とする洗浄方法。A cleaning method, wherein a jig to which a thioepoxy plastic raw material is attached is cleaned with a cleaning solvent made of tetrahydrofuran. 前記チオエポキシ系プラスチック原料が付着した治具を、前記テトラヒドロフランからなる洗浄用溶剤に浸漬することを特徴とする請求項1記載の洗浄方法。The cleaning method according to claim 1, wherein the jig to which the thioepoxy plastic material is attached is immersed in a cleaning solvent made of tetrahydrofuran. 前記チオエポキシ系プラスチック原料が付着した治具に、前記テトラヒドロフランからなる洗浄用溶剤を掛け流し洗浄することを特徴とする請求項1記載の洗浄方法。The cleaning method according to claim 1, wherein the cleaning solvent made of tetrahydrofuran is sprinkled on the jig to which the thioepoxy plastic raw material is attached. 前記チオエポキシ系プラスチック原料が付着した治具を、前記テトラヒドロフランからなる洗浄用溶剤を染込ませたウエスまたはスポンジで拭き取りを行うことを特徴とする請求項1記載の洗浄方法。The method of cleaning according to claim 1, wherein the performing wiping the jig the thioepoxy plastic material is attached, on the scan or sponge soaked with cleaning solvent consisting of the tetrahydrofuran.
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US8103313B2 (en) 1992-11-09 2012-01-24 Adc Technology Inc. Portable communicator

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JP5423943B2 (en) * 2008-02-26 2014-02-19 三菱瓦斯化学株式会社 Cleaning agent and cleaning method for composition containing sulfur and selenium atoms
CN109158387B (en) * 2018-09-28 2023-11-17 中核四川环保工程有限责任公司 Dredging device and dredging control system

Cited By (1)

* Cited by examiner, † Cited by third party
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US8103313B2 (en) 1992-11-09 2012-01-24 Adc Technology Inc. Portable communicator

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