JPH0860191A - Water substituent - Google Patents

Abstract

PURPOSE: To obtain a water substituent capable of removing the moisture attached to precision parts without the need of using any special device and without causing environmental disruptions. CONSTITUTION: This water substituent has, as non-aqueous solvent, a hydrocarbon solvent <=180 deg.C in 50% running point and >=41 deg.C in flash point, with the viscosity of the remaining components including at least surfactant other than the non-aqueous solvent totaling <=11mm<2> /s (40 deg.C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water displacing agent for displacing water adhering on a metal surface with a non-aqueous solvent, and more particularly, it is used for cleaning precision parts such as rolling bearings to be cleaned. The present invention relates to a water displacing agent used for drying washed products.

[0002]

2. Description of the Related Art Conventionally, as a method for cleaning precision parts such as rolling bearings, after cleaning the precision parts with a water-soluble cleaning agent, water adhering to the parts in the rinsing step is removed by a fluorine-based solvent such as fluorocarbon. It has been removed by using a mixed solvent in which a surfactant is mixed with a chlorine-based solvent such as 1,1,1-trichloroethane.

However, the above-mentioned fluorine-based solvents such as CFCs and chlorine-based solvents such as 1,1,1-trichloroethane have the property of depleting the ozone layer in the atmosphere, and therefore their use in recent years from the viewpoint of global environmental protection. Are regulated, and their use will be totally prohibited in the future.

From this point of view, therefore, a cleaning method has been proposed in which the water-soluble solvent is rinsed with water containing an anticorrosive, the water is drained with an oil draining agent, and then the oil draining agent is dried. (For example, Japanese Patent Laid-Open No. 4-1104)
No. 83).

In the above-mentioned cleaning method, by drying the precision parts with hot air or vacuum drying, it is possible to remove the moisture adhering after cleaning without using an organic solvent harmful to the environment.

[0006]

However, in the above-mentioned conventional cleaning method (Japanese Patent Laid-Open No. 4-110483), the adhering water content after cleaning is removed by hot air drying or vacuum drying. There is a problem that a device is required, the device becomes complicated, and the price of the device rises.

The present invention has been made in view of the above problems, and it is possible to remove moisture adhering to an article to be cleaned such as precision parts without using a special device and without causing environmental damage. It is an object to provide a water displacing agent that can be used.

[0008]

To achieve the above object, the present invention provides a water displacing agent containing at least a non-aqueous solvent and a surfactant, wherein the non-aqueous solvent is 50
% Of a hydrocarbon solvent having a distillation point of 180 ° C. or lower and a flash point of 41 ° C. or higher, and the total viscosity of the residual components other than the non-aqueous solvent at a temperature of 40 ° C. is 11 mm ² / s or less. It has a feature.

The structure of the present invention will be described in detail below together with its operation.

As a water displacing agent for removing water adhering to precision parts after cleaning precision parts such as rolling bearings,
Not only is it excellent in water displacement, it is also excellent in dryability, and it can be quickly taken out one by one when taken out after drying because a large number of precision parts are washed at one time (that is, It is required that the items to be cleaned do not stick to each other) and that the precision parts after cleaning have rust prevention.

That is, as the water displacing agent, it is desired to form an anticorrosive film having good water displacing property, quick drying and non-stickiness on the surface of the article to be cleaned.

By the way, the water displacing agent replaces the water adhering on the metal surface with the non-aqueous solvent, and it is needless to say that the main component thereof is the non-aqueous solvent. It is known that no substitution with water is made and a small amount of surfactant must be added to the non-aqueous solvent in order to carry out water substitution successfully (eg, Koike Mosei et al. Interface Properties of Agents ”; Metal Surface Technology, Vol 15,
No. 10, 1964, pp. 5-11).

Therefore, the applicant of the present invention conducted extensive studies on a water displacement agent in which a surfactant was added to a non-aqueous solvent, and as a result, a hydrocarbon having a 50% distillation point of 180 ° C. or less and a flash point of 41 ° C. or more was obtained. The system solvent is a non-aqueous solvent, and the viscosity of the remaining components (surfactant etc.) excluding the non-aqueous solvent is 11 mm ² / s.
It has been found that a water displacing agent having a temperature of (40 ° C.) or lower has a property of forming a rust preventive film which is quick to dry and has no “stickiness”.

That is, when a hydrocarbon solvent having a 50% distillation point of more than 180 ° C. is used as a non-aqueous solvent, the drying time becomes long and the drying property is poor, resulting in a decrease in productivity. If the flash point is 40 ° C or lower, it may cause a fire or an explosion, which increases the risk. That is, 50%
By using a hydrocarbon solvent with a distillation point of 180 ° C or lower and a flash point of 41 ° C or higher as a non-aqueous solvent, it is possible to avoid a danger in handling, and the product to be cleaned without causing environmental damage. Can be dried early.

Specific examples of the hydrocarbon solvent having a 50% distillation point of 180 ° C. or lower and a flash point of 40 ° C. or higher include Isopar G (manufactured by Exxon Chemical Co., Ltd.) and Exol D40 (Exxon Chemical). (Manufactured by Co., Ltd.), Solvesso 10
0 (manufactured by Exxon Chemical Co., Ltd.), Shell Sol A (manufactured by Shell Chemical Co., Ltd.), K Solvent (manufactured by Nippon Oil Co., Ltd.),
Nisseki Hyalom 2S (manufactured by Nippon Oil Co., Ltd.) or the like can be used.

As the surface active agent having a water-displacing action, generally, a cationic surface active agent, a higher amine or a carboxylate thereof can be used. Specifically, oleyl imidazoline, polyoxyethylene stearylamine, stearyl propylenediamine, amines such as lauryl propylene diamine, or octoate these amines, nonanoic acid, C ₉ ~ ₁₁ tertiary carboxylic acid, cis-9
-Octadecenoate and the like can be used.

Further, when the viscosity of the residual components such as the surfactant except the non-aqueous solvent exceeds 11 mm ² / s (40 ° C.), “stickiness” occurs, so that the articles to be cleaned are adhered to each other after water replacement. If they do not come off, or if minute parts such as miniature bearings become sticky, they will stop on the carry-in guide to the next process, and the workability will be impaired.

Therefore, the viscosity of the remaining components such as surfactants other than the non-aqueous solvent is specified to be 11 mm ² / s (40 ° C.) or less.

In the water displacing agent of the present invention, it is preferable to add a predetermined amount of spindle oil as the residual component in order to further improve the stickiness resistance, and the above water displacing property and drying property. It is also preferable to mix other rust preventives, non-ferrous metal anticorrosives, etc., if necessary, within the range where stickiness resistance and rust preventive properties are not hindered.

[0020]

Embodiments of the present invention will be described below.

First, a water displacing agent shown in Table 3 was prepared by mixing a predetermined amount of a surfactant having a viscosity shown in Table 2 with a non-aqueous solvent having a 50% distillation point and a flash point shown in Table 1. (Hereinafter, margin)

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3] As shown in Table 1, in this example, as the non-aqueous solvent, 5
Exol D40 (manufactured by Exxon Chemical Co., Ltd.) and K solvent (manufactured by Exxon Chemical Co., Ltd.) having 0% distillation point and flash point within the scope of the present invention, and the above 50% distillation point and flash point are within the scope of the present invention. White kerosene (made by Nippon Oil Co., Ltd.) outside was used.

Further, Table 2 shows a surfactant that contributes to water displacement, and a spindle oil (RC spindle oil, E spindle oil (both manufactured by Cosmo Oil Co., Ltd.) added to further improve the stickiness resistance. It shows the viscosity of
In Table 2, for lauryl propylene diamine, the absolute viscosity measured by a B-type rotational viscometer is shown.

Then, the non-aqueous solvent, the surfactant and the like were prepared so as to have the contents shown in Table 3 to prepare a water displacing agent. In Table 3, No. Nos. 1 to 7 represent the water displacement agent of the present invention, and No. 8-11 has shown the water displacement agent of a comparative example.

That is, the present invention No. Comparative Examples Nos. 1 to 7 used Exol D40 (manufactured by Exxon Chemical Co., Ltd.) or K Solvent (manufactured by Exxon Chemical Co., Ltd.) as the non-aqueous solvent. White kerosene (manufactured by Nippon Oil Co., Ltd.) was used for Nos. 8 and 9, and Comparative Example Nos. 10 and 11 use Exol D40 (manufactured by Exxon Chemical Co., Ltd.).

The remaining components other than the non-aqueous solvent consisting of the surfactant and the spindle oil are mixed in the non-aqueous solvent in the proportions (% by weight) shown in Table 3, and JIS is used.
It was measured by the kinematic viscosity test method according to K2283-1980.

As is clear from Table 3, the present invention N
o. 1 to 7 all have a viscosity of 11 mm ² / s or less, which satisfies the range of the present invention, while Comparative Example N
o. 8, 10, and 11 are outside the scope of the present invention.

Then, these No. For 1 to 11,
Tests were carried out for water displacement, dryability, stickiness resistance, and rust resistance.

Water displacement 60 × 80 × 1.2 mm cold rolled steel sheet (material: SPCC-
SB) was polished with # 240 polishing paper (sandpaper), and then washed with xylene, warm methanol, and water in this order.
Then, with the washed test piece still wet with water, the water displacing agent No. It was dipped in 1 to 11 and then the time until the water droplets adhering to the surface of the test piece dropped and were replaced with water was measured. As a criterion, when the water replacement was completed within 10 seconds, it was judged as good (◯), and when the water replacement was not completed within 10 seconds, it was judged as unacceptable (x).

As is clear from Table 3, the water substitution property of No. 1 of the present invention. 1 to 7 and Comparative Example No. All of 8 to 11 obtained the result of "good". It is considered that this is because the surfactant having a water-displacing action was added to all the test pieces, so that the water-displacing property was satisfactory regardless of the characteristics of the non-aqueous solvent.

Dryability 60 × 80 × 1.2 mm cold rolled steel sheet (material: SPCC-
SB) was washed with xylene and warm methanol in this order, and then the water displacing agent No. It was dipped in 1 to 11 and left in an atmosphere of a temperature of 40 ° C. to determine whether or not it was dried by touching with a finger. The criteria were judged to be good (∘) when dried within 10 minutes, acceptable (∘) when dried within 10 to 60 minutes, and unacceptable (x) when it took 60 minutes or more to dry.

As is clear from Table 3, white kerosene is 50%
The distillation point was 180 ° C (228 ° C) or higher, and it took a long time to dry.

Stickiness resistance Five ball bearing inner rings having an inner diameter of 6 mm were washed in the order of xylene and warm methanol, and then the water displacing agent No. The ball bearing inner rings were vertically piled and left standing for 24 hours. The criterion for stickiness resistance is 1 from the top test piece using tweezers.
The resistance at the time of picking up one by one was qualitatively evaluated, and it was judged as good (◯) when it could be taken without resistance one by one, and as bad (x) when it was taken in the state of two or more closely adhering.

As is clear from Table 3, when the viscosity of the residual components other than the non-aqueous solvent in the water displacing agent, that is, the surfactant, etc., becomes high at 11 mm ² / s (40 ° C.) or more, the stickiness resistance is high. It turns out that the sex deteriorates.

Anticorrosion 5 ball bearing outer rings with an outer diameter of 15 mm were washed in the order of xylene and warm methanol, and then the water displacing agent No. After being immersed in 1 to 11, these ball bearing outer rings were exposed to a temperature of 30 ° C. and a humidity of 80% for 3 days to observe the rust generation state. The criteria for rust prevention were judged to be good (∘) when no rust was generated on all the test pieces, and unacceptable (x) when rust was generated on one or more test pieces.

As is clear from Table 3, the rust preventive property of the present invention No. 1 to 7 and Comparative Example No. All of 8 to 11 obtained the result of "good".

From the above results, as the water displacing agent, in order to satisfy the desired drying property, the 50% distillation point of the non-aqueous solvent is 1%.
It has a flash point of 41 ° C. or higher in order to ensure the handling safety at 80 ° C. or lower, and the residual components excluding the non-aqueous solvent in order to maintain the stickiness resistance (in this example, the surface activity is It has been found that the necessary and sufficient condition is that the viscosity of the agent and the spindle oil) be 11 mm ² / s or less. Moreover, the water displacing agent of the present invention comprises a non-aqueous solvent composed of a hydrocarbon solvent, and does not use a fluorine-based solvent such as CFCs or 1,1,1-trichloroethane or another chlorine-based solvent,
It does not lead to environmental damage, and it is possible to remove the attached water after cleaning without using a large-scale device such as hot air drying or vacuum drying.

[0040]

As described in detail above, according to the water displacing agent of the present invention, the water displacing property is excellent and the article to be cleaned can be dried early without causing environmental damage.

Further, the film formed on the surface of the article to be cleaned after water replacement is excellent in rust prevention and is not sticky so that workability is not impaired.

Moreover, unlike the conventional case, a special device such as a hot air drying device or a vacuum drying device is not required for the drying process, and the water adhering to the article to be cleaned can be removed easily and quickly.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location // B08B 3/10 Z 2119-3B (72) Inventor Emiko Shiraishi 1-5-50 Kunmuma, Kugenuma, Fujisawa-shi, Kanagawa No. Nippon Seiko Co., Ltd. (72) Inventor Michiharu Naka, 1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa NIPPON SEIKO CO., LTD. (72) Inventor Takatoshi Ishikawa 1541 Nishikubo, Chigasaki City, Kanagawa Prefecture (72) Inventor Tatsumi Harada 757-1 Nishikubo, Chigasaki City, Kanagawa Prefecture

Claims (1)

[Claims] 1. A water displacing agent containing at least a non-aqueous solvent and a surfactant, wherein the non-aqueous solvent is a hydrocarbon solvent having a 50% distillation point of 180 ° C. or lower and a flash point of 41 ° C. or higher. And the total viscosity of the remaining components other than the non-aqueous solvent at a temperature of 40 ° C. is 11 mm ² / s or less in total.