JP4104715B2 - Solvent composition for removing adhering water - Google Patents

Description

ＭＮＦＢＥ： メチルノナフルオロブチルエーテル
ＴＦＥＨＦＰＥ：テトラフルオロエチルヘプタフルオロプロピルエーテル
ノニオン活性剤：Ｎ−プロピル−Ｎ−ポリエトキシパーフルオロオクタンスルホンアミド
カチオン活性剤：（Ｃ₁₂Ｈ₂₅）₂ Ｎ（ＣＨ₃ ）₂ Ｃｌ
【００２２】
表１から明らかなように、ＨＦＥ（Ａ）、１，２−ジクロロエチレン（Ｂ）及び界面活性剤（Ｃ）を必須成分とする本発明の溶剤組成物は、付着水除去率が高く、特に界面活性剤（Ｃ）としてＲ¹ _mＮＲ² _nＣｌで表されるカチオン界面活性剤を用いた溶剤組成物は、付着水をほとんど完全に除去できる優れた付着水除去用溶剤である。
これに対しＨＦＥと１，２−ジクロロエチレンのみからなる溶剤は付着水除去率が０％であり、被洗浄物の付着水除去は不可能である。またＨＦＥに界面活性剤のみを添加したものは、界面活性剤を充分量添加することができず、そのため付着水除去率は低く十分な性能を持っているとは云えない。
【００２３】
【発明の効果】
ＨＦＥ、１，２−ジクロロエチレン及び界面活性剤からなる本発明の溶剤組成物は、付着水除去率が高く、洗浄液自体の除去が容易にできるので、精密機械工業、電子工業分野において、金属部品や光学部品を水洗した後の乾燥工程の際、被洗物を高温に加熱することなく付着残留した水を溶剤で置換することにより、短時間で乾燥ができ、しみのない製品が得られる。
またクロロフルオロカーボンを使用していないので、オゾン層破壊の恐れもなく、従来用いられていたクロロフルオロカーボン系洗浄剤と同様の使用方法で洗浄を行うことができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solvent composition for removing attached water using a hydrofluoroether. More specifically, the present invention relates to a composition suitable for removing water adhering to metal, plastic, glass parts and the like such as precision machines, optical machines and electronic devices.
[0002]
[Prior art]
Many precision metal parts, optical parts, and electronic parts use water in the middle of processing. For removal and drying of adhering residual water required as a post-treatment in this process, water should be used without corroding the object to be cleaned. A cleaning agent having an appropriate boiling point is used so that it can be washed off and the cleaning liquid itself can be easily removed. As such a cleaning agent, a composition obtained by mixing a surfactant with a chlorofluorocarbon-based cleaning agent (for example, CFC-113, boiling point 48 ° C.) has been used. However, with regard to chlorofluorocarbons, international regulations have been implemented based on the Vienna Convention and the Montreal Protocol from the viewpoint of protecting the ozone layer, and production has already been abolished in Japan.
[0003]
Therefore, without losing the low toxicity, nonflammability, and low corrosive properties of the solvent composition for removing chlorofluorocarbon-based adhering water such as CFC-113, water replacement performance is excellent and there is no risk of destroying the ozone layer. Development of a solvent composition for removing adhered water is desired.
[0004]
Accordingly, the inventors have previously searched for such a solvent, and as a result, proposed a solvent composition obtained by mixing a hydrofluoroether with a surfactant (Japanese Patent Application No. 8-122073).
The solvent composition using the hydrofluoroether (hereinafter referred to as HFE) according to the present invention as a main component has no fear of destroying the ozone layer, and can be substituted for chlorofluorocarbons such as CFC-113. However, a solvent composition that removes water adhering to metal, plastic, and glass parts such as precision machinery, optical machinery, and electronic equipment is desired with a smaller amount of solvent composition for removing adhering water. It is rare.
[0005]
[Problems to be solved by the invention]
Therefore, as a result of searching for a prescription for a solvent composition for removing adhering water that can remove adhering water in a smaller amount, the present inventor dissolved HFE alone in a surfactant by mixing 1,2-dichloroethylene with HFE. It has been found that the effect of removing the adhering water is further improved by supplementing the properties and sufficiently exerting the performance of the surfactant.
Moreover, when using the mixture of HFE and 1, 2- dichloroethylene as a solvent composition for adhesion water removal, it discovered that a specific quaternary ammonium salt was optimal as surfactant added to this.
[0006]
[Means for Solving the Problems]
That is, the present invention is a solvent composition for removing adhering water obtained by mixing hydrofluoroether (A) with 1,2-dichloroethylene (B) and surfactant (C). General formula
R ¹ _m NR ² _n Cl
(Wherein, m = 2 or 3, n = 1 or 2, m + n = 4, R 1 is C ₆ - alkyl group of _18, ^{R 2} represents an alkyl group of _{C 1-2)} represented by A cationic surfactant or N-propyl-N-polyethoxyperfluorooctanesulfonamide (nonionic surfactant) is preferably used, and methyl nonafluorobutyl ether or ethyl nonafluorobutyl ether is preferably used as the hydrofluoroether (A). is there.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
HFE (A) which is the main component of the solvent composition of the present invention is not particularly limited, but some or all of hydrogen atoms of ether, preferably aliphatic ether having 4 to 8 carbon atoms, are substituted with fluorine. Is.
When the carbon number is less than 2, the boiling point becomes too low and the HFE transpiration loss increases. When the carbon number is more than 8, the boiling point becomes too high, and the solvent composition for removing this adhering water from the article to be cleaned is removed. There is a tendency for energy consumption to be removed to increase. Further, from the viewpoint of flammability, a compound in which a majority of hydrogen atoms are substituted with fluorine atoms is preferred.
[0008]
Examples of such HFE include tetrafluoroethyl heptafluoropropyl ether, trifluoroethyl tetrafluoroethyl ether, methyl hexafluoropropyl ether, methyl nonafluorobutyl ether, and ethyl nonafluorobutyl ether.
Among the HFE, alkyl perfluoroalkyl ethers _{(C m H 2m + 1 OC} n F 2n + 1) are preferred, especially methyl nonafluorobutyl ether (MNFBE) and, boiling point, such as ethyl nonafluorobutyl ether (ENFBE) An alkyl perfluoroalkyl ether having a temperature of 30 to 80 ° C. or lower is an HFE suitable for the present invention because it can reduce energy consumption for evaporation and removal. The above-mentioned HFE can be used alone or in combination.
[0009]
When adding a surfactant to HFE and using it as a solvent composition for removing adhering water, it is necessary to add an organic solvent to supplement the solubility of HFE alone in the surfactant and to further improve the adhering water removing effect. Although effective, such an organic solvent that is mixed with HFE and dissolves the surfactant is compatible with HFE, and if it is compatible with water, it is extracted by the mixed water and causes a composition change. It is necessary to have no compatibility with water because of the danger. From these points, it was found that 1,2-dichloroethylene is particularly effective for the solvent composition for removing adhering water of the present invention.
[0010]
As 1,2-dichloroethylene (B), either trans-1,2-dichloroethylene or cis-1,2-dichloroethylene can be used, or a mixture of both may be used.
[0011]
The content of 1,2-dichloroethylene (B) is preferably 1% by weight to 50% by weight, particularly preferably 10% by weight to 40% by weight, based on the total amount of HFE (A) and 1,2-dichloroethylene (B). . If the blending amount of 1,2-dichloroethylene is small, the effect of improving the solubility of HFE in the surfactant is small, so that the effect of removing adhering water cannot be improved. This is not preferable because physical properties may be impaired.
[0012]
The surfactant to be blended with the HFE and 1,2-dichloroethylene of the present invention includes the following general formula R ¹ _m NR ² _n Cl
(Wherein, m = 2 or 3, n = 1 or 2, m + n = 4, R 1 is C ₆ - alkyl group of _18, ^{R 2} represents an alkyl group of _{C 1-2)} represented by Surfactants, ie quaternary ammonium salt cationic surfactants where the cationic moiety is [R ¹ _m NR ² _n ] ⁺ and the anionic moiety is [Cl] ⁻ or N-propyl-N-polyethoxyperfluorooctane Sulfonamide (nonionic surfactant) is used.
[0013]
The content of the surfactant (C) is 0.01% to 10% by weight, particularly 0.1% to 5% by weight, based on the mixture of HFE (A) and 1,2-dichloroethylene (B). Is preferred. If the amount of the surfactant is small, the effect of removing adhering water is reduced. If the amount is too large, the surfactant is not sufficiently rinsed.
[0014]
In addition, nitroalkanes, epoxides, furans, benzotriazoles, phenols, amines and the like can be added as stabilizers to the solvent composition for adhesion removal.
[0015]
Furthermore, organic liquids such as hydrocarbons, alcohols, ketones, ethers and esters can be mixed in order to improve the ability to remove adhering water and improve the solubility of the surfactant.
[0016]
In order to remove water adhering to an article using the solvent composition of the present invention, the most common method is to immerse in a composition for removing adhering water in a boiling state. Other methods such as rocking can also be used. The surfactant adhering to the object to be cleaned after removing water can be rinsed off with HFE or a mixed solution of HFE and dichloroethylene.
[0017]
【Example】
[Example 1]
Methyl nonafluorobutyl ether and cis-1,2-dichloroethylene are blended at 60 wt% and 40 wt%, respectively, and N-propyl-N-polyethoxyperfluorooctanesulfonamide (trade name) is used as a nonionic surfactant. Ftop EF-122B, manufactured by Mitsubishi Materials) was mixed at 0.5% by weight with respect to the mixture to prepare a solvent composition for removing adhering water.
3 ml of pure water was placed in a 25 ml graduated cylinder, and glass beads having a diameter of 0.4 mm were placed up to a marked line of 8 mm. Next, the above adhering water removing solvent composition was poured up to the 25 ml mark of a graduated cylinder containing glass beads, and the amount of water floating on the top of the solution was measured immediately after injection and 5 minutes later. Further, the water removal rate was determined.
The results are shown in Table 1.
Adherent water removal rate = (amount of water floating up to 5 minutes later / amount of pure water (3 ml)) × 100
[0018]
[Example 2]
In Example 1, instead of a nonionic surfactant, 0.5 wt. Of a cationic surfactant, # 621 (structural formula; (C ₁₂ H ₂₅ ) ₂ N (CH ₃ ) ₂ Cl) is used as the surfactant. The adhering water removal rate was determined in the same manner as in Example 1 except that the adhering water removing solvent was used as a solvent for removing adhering water. The results are shown in Table 1.
[0019]
[Comparative Example 1]
Adhering in the same manner as in Example 1, except that the surfactant was not added in Examples 1 and 2, and a mixed liquid consisting only of methyl nonafluorobutyl ether and cis-1,2-dichloroethylene was used as a solvent for removing adhering water. The water removal rate was determined. The results are shown in Table 1.
[0020]
[Comparative Example 2]
A mixture of cis-1,2-dichloroethylene, tetrafluoroethyl heptafluoropropyl ether as HFE, and the same nonionic surfactant as used in Example 1 was used as a solvent for removing adhering water. It was. However, in a solvent not containing 1,2-dichloroethylene, the solubility of the surfactant is small and it cannot be added in a large amount, so the addition amount of the surfactant was set to 0.1% by weight (vs. HFE). Using this adhesion water removal solvent, the adhesion water removal rate was determined in the same manner as in the example. The results are shown in Table 1.
[0021]
[Table 1]

MNFBE: methyl nonafluorobutyl ether TFEHFPE: tetrafluoroethyl heptafluoropropyl ether nonionic activator: N-propyl-N-polyethoxyperfluorooctanesulfonamide cationic activator: (C ₁₂ H ₂₅ ) ₂ N (CH ₃ ) ₂ Cl
[0022]
As is apparent from Table 1, the solvent composition of the present invention containing HFE (A), 1,2-dichloroethylene (B) and surfactant (C) as essential components has a high adhesion water removal rate, particularly at the interface. A solvent composition using a cationic surfactant represented by R ¹ _m NR ² _n Cl as the activator (C) is an excellent solvent for removing adhering water that can almost completely remove adhering water.
On the other hand, the solvent consisting only of HFE and 1,2-dichloroethylene has a removal rate of adhering water of 0%, and it is impossible to remove adhering water from the object to be cleaned. In addition, when only the surfactant is added to the HFE, a sufficient amount of the surfactant cannot be added, and therefore, it cannot be said that the adhesion water removal rate is low and the performance is sufficient.
[0023]
【The invention's effect】
The solvent composition of the present invention consisting of HFE, 1,2-dichloroethylene and a surfactant has a high adhesion water removal rate and can easily remove the cleaning liquid itself. In the drying process after washing the optical parts with water, the water that remains attached is replaced with a solvent without heating the object to be washed at a high temperature, so that the product can be dried in a short time and free from stains.
Moreover, since no chlorofluorocarbon is used, there is no fear of ozone layer destruction, and cleaning can be performed by the same method of use as conventionally used chlorofluorocarbon-based cleaning agents.

Claims (3)

Hydrofluoroether (A) with 1,2-dichloroethylene (B) and the following general formula
R ¹ _m NR ² _n Cl
(Wherein, m = 2 or 3, n = 1 or 2, m + n = 4, R 1 is C ₆ - alkyl group of _18, ^{R 2} represents an alkyl group of _{C 1-2)} represented by A solvent composition for removing adhering water obtained by mixing a cationic surfactant and a surfactant (C) selected from N-propyl-N-polyethoxyperfluorooctanesulfonamide .   The solvent composition for removing attached water according to claim 1, wherein the hydrofluoroether (A) is an alkylperfluoroalkylether.   The solvent composition for removing attached water according to claim 2, wherein the alkyl perfluoroalkyl ether is methyl nonafluorobutyl ether or ethyl nonafluorobutyl ether or a mixture of both.