JPH0525499A - Detergent composition for braking device - Google Patents

Abstract

PURPOSE:To obtain a detergent composition for braking device which can wash brake discs or brake drums safely, easily and quickly within a controlled period of drying time without scattering asbestos dust attached to the rotating body thereof and without causing depletion of the ozone layer. CONSTITUTION:The objective composition comprises 20-97wt.% of a 5C hydrocarbon, 3-60wt.% of a 1-3C aliphatic monohydric alcohol and 77wt.% or less of a 6-8C hydrocarbon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent composition used for cleaning a friction brake device, for example, an automobile disc brake device, a drum brake device, etc. The drying speed is adjusted without scattering adhered asbestos dust, etc., and it is safe, easy, and quick.
Furthermore, the present invention relates to a detergent composition that can be washed without destroying the ozone layer.

[0002]

2. Description of the Related Art A friction brake device, particularly an automobile friction brake device, usually has a structure in which a brake shoe having a brake lining acts on a rotating body such as a brake disc or a brake drum as a brake element.

Usually, asbestos is used for this brake lining, and as the brake is used, the asbestos becomes dust and adheres to the brake disc, etc., and eventually exerts a bad influence on the braking of the brake. . As a method of removing this asbestos dust,
Conventionally, the following has been adopted.

1. Spray asbestos with high pressure air to disperse asbestos. 2. Rinse with water. 3. Hydrocarbons such as toluene and xylene and carbon numbers 6-10
A mixture of the petroleum fraction containing hydrocarbon as a main component with an aliphatic monohydric alcohol or the like or an aliphatic dihydric alcohol mono-lower alkyl ether is washed as a washing liquid. (Japanese Patent Sho 58-
44118) 4.1.1.1-Washing with a mixture of a chlorinated hydrocarbon such as trichloroethane and an aliphatic monohydric alcohol as a washing liquid. (Japanese Patent Publication No. 58-44118) 5. A mixture of freon such as freon 113 and an aliphatic monohydric alcohol is washed as a washing liquid.

[0005]

Problems to be Solved by the Invention In the above method 1,
It is said that asbestos dust scatters, and if this asbestos dust pierces the inner wall of the lungs of the human body, it causes a high cancer rate, which is a problem in terms of occupational health. Therefore, the above-mentioned method 2 was considered, but this method has a problem that the working time becomes extremely long. Therefore, the above-mentioned methods 3, 4, and 5 are methods that have improved these problems. However, in methods 3 and 4, there are many cases in which there are problems in the working environment, such as the substances used in the cleaning liquid being subject to the organic solvent poisoning prevention regulations. Further, if this problem is cleared, it often takes 4 to 10 minutes or more for the drying time. In recent years, the brake device is immediately assembled after cleaning the brake device, which is a serious problem in work. Further, these substances often have a peculiar odor, which causes a problem in workability. Although the above-mentioned method 5 solved these problems, it was discovered from the results of recent research that CFCs released into the atmosphere destroy the ozone layer, and the production amount thereof has been regulated. There is. The above-mentioned method 4 has the same problem and is similarly regulated. Therefore, a new method for cleaning a brake device that solves these problems is desired.

The object of the present invention is to prevent the asbestos dust or the like adhering to the rotating body of the brake disc or the brake drum in the braking device from scattering, and to adjust the drying speed to be safe, simple and quick, and further, the ozone layer. SUMMARY OF THE INVENTION It is an object of the present invention to provide a cleaning composition for a brake device, which can be cleaned without destroying the above and improved the above-mentioned drawbacks of the known art.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, a saturated hydrocarbon having 5 carbon atoms 20 to 97 is used.
Weight percent, aliphatic monohydric alcohols having 1 to 3 carbon atoms 3 to 60 weight percent and hydrocarbons having 6 to 8 carbon atoms 77
It is characterized by comprising less than or equal to a weight percentage.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention is described in detail below. Table 1 shows typical properties of saturated hydrocarbons having 5 carbon atoms.

[0009]

[Table 1]

From Table 1, the characteristics of the hydrocarbon having 5 carbon atoms are as follows. 1. Low boiling point at room temperature. (Closest to Freon 113) 2. High ignition point. Other features include the following. 3. Since it is a paraffin hydrocarbon and a naphthene hydrocarbon, it has little effect on the human body. 4. Does not destroy the ozone layer. 5. There is almost no odor. 6. Drying time is very short.

Here, since rubber parts are used in the brake device, the influence on rubber was examined using the samples of Example 1 and Comparative Example 8 described later. It was found to be about the degree (see Table 2). However, these hydrocarbons could not dissolve the dedicated oils and fats (brake fluid) used in the brake system. As a result of further research, it was found that this problem can be solved by adding about 1% by weight or more of alcohol. However, when the effects on rubber were examined using cleaning solutions with various alcohol concentrations, Fig. 1
Got the result. FIG. 1 is a graph showing the relationship between the alcohol content in the cleaning liquid and the rubber swelling rate, and
5 and Comparative Examples 1 to 3 are based on the same test method as the rubber resistance. From this result, it was found that the cleaning liquid having an alcohol concentration of 3% by weight or less had a greater effect on the rubber than in the case where no alcohol was added. The alcohol added there must be at least 3 weight percent.

Next, the relationship between the detergency against oils and fats and the concentration of alcohol was examined (see FIG. 2). FIG. 2 is a graph showing the relationship between the solubility of oils and fats and the alcohol concentration of the cleaning liquid. From Examples 1 to 5 and Comparative Examples 1 to 3, the same test method as the solubility was used until suspension. The amount of oil and fat was measured. In FIG. 2, curve 1 is brake fluid, and curve 2 is normal oil and fat. As a result, the concentration of alcohol is 60
It has been found that when it exceeds the weight percentage, ordinary fats and oils are not dissolved. Therefore, the concentration of alcohol needs to be 60% by weight or less. Further, taking the drying rate into consideration, the alcohol needs to be an aliphatic monohydric alcohol having 1 to 3 carbon atoms. From FIG. 2, the concentration of alcohol is more preferably 25 to 40 percent. When these mixed liquids are used as a cleaning liquid, the drying time may be slightly too fast depending on the operating temperature and the size of the brake device to be cleaned. In such a case, the drying time can be adjusted without changing other properties by reducing the ratio of the saturated hydrocarbon having 5 carbon atoms and adding the hydrocarbon having 6 to 8 carbon atoms in its place. At this time, the ratio of hydrocarbons having 5 carbon atoms is set to a minimum of 20% by weight due to the problems of drying time and ignition point.

The saturated hydrocarbon having 5 carbon atoms used herein is cyclopentane, isopentane, n-pentane, or a mixture thereof, and it is preferable that the saturated hydrocarbon has 20 to 97 percent, and the hydrocarbon having 6 to 8 carbon atoms. Is isohexane, isooctane, 2 methyl pentane, 3 methyl pentane, cyclohexane, 2,3 dimethyl butane or a mixture thereof, and it is preferable that the content thereof is 77% by weight or less. Further, the alcohol has 1 to 3 carbon atoms. Aliphatic monohydric alcohol, specifically methyl alcohol, ethyl alcohol, n-propyl alcohol,
Isopropyl alcohol, or a mixture thereof, preferably containing 3 to 60 weight percent.

The cleaning method of the present invention is suitable not only for the brake device but also for the pretreatment of the flange surface and the adhesive surface, the cleaning of electronic parts, machine parts, metal products and the like.

[0015]

【Example】

Test method With the lining surface of the dry brake lining facing upward, 20 ml of each composition stock solution is uniformly applied to the entire surface of the lining.
After that, the time until the entire surface is dried is measured.

A rubber-resistant rubber test piece of 2 × 25 × 100 mm was weighed, and the test piece was dipped in various composition stock solutions shown in Examples and Comparative Examples at room temperature (25 ° C.) for 30 minutes, and thereafter, Take it out, wipe the undiluted solution completely with a waste cloth, weigh the test piece, and calculate the weight change rate by the following formula. X = (B−A) / A × 100 where X: mass change rate A: mass of test piece before immersion B: mass of test piece after immersion

Solubility (detergency) 50 ml of stock solutions of various compositions shown in Examples and Comparative Examples are taken, 1 ml of various oils and fats are added, and whether or not they are compatible is visually observed. Judgment Transparently compatible 〇 Almost dissolved (suspended) △ Not dissolved ×

[0018]   Example 1 97 parts by weight of cyclopentane             3 parts by weight of ethanol   Example 2 95 parts by weight of cyclopentane             5 parts by weight of ethanol   Example 3 75 parts by weight of cyclopentane             25 parts by weight of ethanol   Example 4 60 parts by weight of cyclopentane             40 parts by weight of ethanol   Example 5 40 parts by weight of cyclopentane             60 parts by weight of ethanol   Example 6 Marcazole F 82 parts by weight             (Maruzen Petrochemical Co., Ltd. cyclopentane about 65 parts by weight and carbon number 6 para               Mixtures with fine hydrocarbons)             Marcazole 8 15 parts by weight             (Maruzen Petrochemical Co., Ltd. C8 isoparaffin hydrocarbons               100 percent)             Solmix A-11 3 parts by weight             (Nippon Kasei Co., Ltd. ethanol, methanol, IPA mixture)   Example 7 Marcazole F 30 parts by weight             Marcazole 8 10 parts by weight             Solmix A-11 60 parts by weight

[0019]   Comparative Example 1 Cyclopentane 99 parts by weight             1 part by weight of ethanol   Comparative Example 2 98 parts by weight of cyclopentane             2 parts by weight of ethanol   Comparative Example 3 Cyclopentane 100 parts by weight   Comparative Example 4 40 parts by weight of Exesol D30             (Exxon Chemical Co., Ltd. mixes naphthenes and paraffins having 9 to 10 carbon atoms.               Compound)             IPA 20 parts by weight             (Isopropyl alcohol)             Propylene glycol               40 parts by weight of monomethyl ether   Comparative Example 5 Toluene 20 parts by weight             IPA 80 parts by weight   Comparative Example 6 1.1.1-Trichloro 95 parts by weight                         Ethane             5 parts by weight of ethanol   Comparative Example 7 Toluene 50 parts by weight             Xylene 50 parts by weight   Comparative Example 8 Freon 113 97 parts by weight             IPA 3 parts by weight

[0020]

[Table 2]

Using the samples of the above-mentioned Examples and Comparative Examples, experiments were conducted on the items of solubility, rubber resistance, drying property, organic solvent poisoning prevention rule, and CFC regulation, and the results are shown in Table 3. As a result, it can be seen that the samples according to the present invention (Examples 1, 3, 4, 6, 7) are totally superior to those of the comparative examples.

[0022]

[Table 3]

[0023]

The above-mentioned composition of the present invention has the same excellent cleaning effect as the cleaning using the non-CFC cleaning liquid and the cleaning using the CFC which have been developed in recent years, while it is a non-CFC and does not damage the global environment, It is toxic and has the same dryness and low odor as CFCs while protecting the working environment, and is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a graph showing a relationship between an alcohol content in a cleaning liquid and a rubber swelling rate.

FIG. 2 is a graph showing the relationship between the solubility of oils and fats and the alcohol concentration of the cleaning liquid.

[Explanation of symbols] 1 brake fluid 2 Normal fats and oils

Claims (4)

[Claims] 1. A brake comprising 20 to 97% by weight of a saturated hydrocarbon having 5 carbon atoms, 3 to 60% by weight of an aliphatic monohydric alcohol having 1 to 3 carbon atoms and 77% by weight or less of a hydrocarbon having 6 to 8 carbon atoms. Cleaning composition for equipment. 2. The cleaning composition for a brake device according to claim 1, wherein the saturated hydrocarbon having 5 carbon atoms is cyclopentane, isopentane, n-pentane or a mixture thereof. 3. The cleaning composition for a brake device according to claim 1, wherein the aliphatic monohydric alcohol having 1 to 3 carbon atoms is methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol or a mixture thereof. 4. The detergent composition for a brake device according to claim 1, wherein the hydrocarbon having 6 to 8 carbon atoms is isohexane, 2 methylpentane, 3 methyl pentane, cyclohexane, 2,3 dimethylbutane, isooctane or a mixture thereof. .