JPH07103397B2 - Brake device cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent for a brake device, and more particularly to cleaning a brake device for vehicles such as automobiles.

[0002]

2. Description of the Related Art Conventionally, a friction brake device for an automobile is generally braked by friction between a brake shoe and a brake drum or a brake disc. Then, dust and the like generated from the brake shoes and the like gradually adhere and accumulate and adversely affect the operation of the brake, so that it is necessary to clean the brake shoes at an appropriate time. Since dust is attached to oil and the like used around the brake device and asbestos is used in the brake shoes, a wet detergent having high fat solubility has been developed as a detergent.

Examples of such a wet cleaning agent include the following. (A) A cleaning agent containing 1,1,1-trichloro-1,2,2-trifluoroethane (hereinafter referred to as Freon 113) as a main component. (B) A cleaning agent containing 1,1,1-trichloroethane as a main component. (C) A cleaning agent in which an aromatic hydrocarbon and an alcohol solvent are mixed. (D) A detergent containing an aliphatic hydrocarbon as a main component.

[0004]

However, among these detergents, the detergents (a) to (c) are good in terms of detergency and quick-drying property, but have the following problems. It was First, the flon 113 and 1,1,1-trichloroethane used in the cleaning agents (a) and (b) have been determined to be completely abolished in recent years as causative substances of the ozone layer depletion, and cannot be used. In addition, since most of the (c) aromatic hydrocarbon-based cleaning agents are subject to the organic solvent poisoning prevention rules (hereinafter referred to as the organic rules), an exhaust system should be provided for cleaning the brake system. It is necessary to improve the working environment. Furthermore, it is a component that is difficult to use considering the health of workers. In addition, it has a great influence on rubber and plastics used as parts and is not desirable as a cleaning agent.

In view of the above, in recent years, the aliphatic hydrocarbon type cleaning agents shown in (d) have come to be used.
This aliphatic hydrocarbon solvent does not have the environmental problems described above and compatibility problems with parts, but when the hazardous substance category is No. 2 petroleum, the drying time is very slow because of low volatility. , It took time to clean and assemble the brake device, and the workability was poor. On the other hand, in the case of the first petroleum products, the drying point is fast, but the flash point is below room temperature, and there is a problem in terms of handling safety. It is only one-fifth of the type, and it is difficult to handle from the aspect of management of work processes such as purchase and storage. Therefore, an object of the present invention is to provide a cleaning agent for a brake device, which belongs to the second petroleum group and which is safe to handle and easy to manage, and which is also excellent in quick-drying property.

[0006]

In order to solve the above-mentioned technical problems, the inventors of the present invention have made extensive studies and as a result, can solve this problem only in a certain combination among many organic solvents. The present invention has been completed by investigating the above and confirming by various tests.

That is, in the present invention, 1-methoxy-2
By mixing propanol and 1,2-dichloropropane in a ratio within a certain range, the following means capable of solving the above problems were created. In order to solve the above technical problem, the invention according to claim 1 comprises 90 to 50% by weight of 1-methoxy-2-propanol and 10 to 50% by weight of 1,2-dichloropropane. The cleaning agent for the brake device is characterized in that The invention according to claim 2 has a flash point of 2
A cleaning agent for a brake device according to claim 1, wherein the flash point is 21 ° C or higher by adding an organic solvent of less than 1 ° C. The invention according to claim 3 uses a cleaning agent for a brake device according to claim 1 or 2, wherein a propellant is added to use as an aerosol agent.

The following characteristics are generally required as a cleaning agent for the brake device. Since dust is attached to the brake device, it must be possible to remove it in a liquid form (wet cleaning) so that it does not scatter. It has a high dissolving power for contaminants around the brake device such as brake fluid, oil and grease. There is little effect on rubber, paint, metal, etc. around the brake device. It has a fast drying speed and can be washed in a short working time. The operator should not feel uncomfortable due to the odor.

Further, considering the working environment, it is necessary to add the following conditions. It does not contain compounds that destroy the ozone layer and is not subject to CFC regulations. There is little effect on the human body that is not subject to the organic rules. The regulations of the Fire Service Act are gradual classification of dangerous goods. If possible, it is preferable to use a second petroleum product or higher that can handle a large amount.

The above-mentioned 1-methoxy-2-propanol is an alcohol solvent which is easy to handle because it is a second petroleum product and is not subject to the organic rule, but the drying speed is not so fast and the cleaning power is a little. Has the disadvantage of being inferior to. In addition, the other component, 1,2-dichloropropane, is a chlorine-based solvent that is not subject to CFC regulations and has a strong dissolving power but has an adverse effect on parts, etc. Is a good organic solvent. In this way, by themselves, they are unsuitable solvents as cleaning agents for brake devices, but by mixing these two components in a prescribed ratio, one of the resulting mixed liquids is used to make up for the drawbacks of the other. It becomes a cleaning agent for the brake device that satisfies each of the above conditions.

This mixing ratio is suitable such that 1-methoxy-2-propanol is 90 to 50% by weight and 1,2-dichloropropane is 10 to 50% by weight, and the former is 75% by weight.
It is desirable that the content is -60% by weight, and the latter is 25-40% by weight. That is, the cleaning agent prepared within the range of this blending ratio is a second petroleum having a flash point of 21 ° C or higher, regardless of the blending ratio, and has the detergency, quick drying property and safety. It is a cleaning agent provided. 1,2-
If the content of dichloropropane is less than 10% by weight, a sufficient cleaning effect cannot be obtained, and the drying speed will be slow. On the other hand, 50% by weight of 1,2-dichloropropane
If it exceeds, the flash point will be low (less than 21 ° C),
It is not preferable because it becomes the first petroleum.

That is, conventionally, a chlorinated aliphatic hydrocarbon and an aliphatic dihydric alcohol mono-lower alkyl ether were mixed and used as a cleaning agent for a brake device, but as a chlorinated aliphatic hydrocarbon, 1 , 2-dichloropropane is prepared by using 1-methoxy-2-propanol as an aliphatic dihydric alcohol mono-lower alkyl ether and using a predetermined compounding ratio,
It is a cleaning agent that has never been seen before. That is, while the prepared cleaning agent belongs to the second petroleum class, the drying property is also improved, which satisfies the function generally required as a cleaning agent for brake devices and is an environmental measure that is not subject to CFC regulations. It is an adapted cleaning agent.

It should be noted that within the range of this mixing ratio, the mixing ratio can be appropriately changed in accordance with the condition of use and the like to prepare a desired brake device cleaning agent.

Further, by adding a solvent (alcohol or primary petroleum) at a temperature of less than 21 ° C. to the detergent mixed in this composition so as not to become primary petroleum, various contaminants can be washed. This makes it possible to improve the drying speed.

Here, as the above-mentioned organic solvent having a flash point of less than 21 ° C., alcohols such as ethyl alcohol, n-propanol, isopropanol, and tert-butanol, n-octane, ethylcyclohexane, and a carbon number of 6 to 6 are used. About 11 aliphatic hydrocarbons, hydrocarbons such as toluene and xylene, ketones such as methyl butyl ketone, diethyl ketone and dipropyl ketone, esters such as butyl formate, propyl acetate, butyl propionate and methyl acetate, and Ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether and dipropyl ether can be used.
It is possible to use a mixture of two or more species. However, it is necessary to prevent adverse effects on materials around the brake device such as rubbers. That is, these compounding ratios are based on 100% by weight of a cleaning agent in which 1-methoxy-2-propanol and 1,2-dichloropropane are mixed in a predetermined amount,
1 to 50% by weight can be added so that the flash point of the entire liquid mixture does not fall below 21 ° C (not to be the first petroleum), and preferably 10 to 30% by weight. Then, depending on the case, it is possible to reduce the solvent odor by adding a fragrance.

Further, a spray gun, an airless gun, a hand spray pump, etc. can be used to use these cleaning agents, but an aerosol is preferable because it does not require equipment such as a device and is easy to handle. As the injection gas, liquefied petroleum gas (LPG), dimethyl ether (DME), carbon dioxide gas, etc. can be used. LPG and D compatible with detergent
In addition to ME, it is desirable to pressurize with carbon dioxide so as to give momentum at the time of injection in order to enhance the cleaning power.

[0017]

[Function] As described above, since the compounded cleaning agent is not subject to the organic rule, the large amount of consumers as well as the small amount of consumers do not need the equipment for maintenance of the working environment, and the cleaning work of the brake device can be performed. It can be done simply and quickly,
Work efficiency is improved. Moreover, since the dangerous goods category belongs to the second petroleum, the handling amount can be increased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below. In addition, in the following examples, the indication of% means% by weight.

First, the test method used in the present invention will be described below. 1. Detergency and Solubility 1 g of each of the oils and greases shown below was placed in a screw tube, 25 ml of the stock solution of the detergent composition shown in Examples and Comparative Examples was added, and after stirring for a while, the mixture was left standing to dissolve. It was visually determined whether or not there is any. Items to be washed 1) Brake fluid 2) Rubber grease 3) Non-melt lubricate 4) Disc brake grease Judgment that is transparently melted ・ ・ ・ ・ ○ (However, solid components such as metals are excluded.) Opaque but almost dissolved・ ・ △ Those that do not dissolve ...

2. Effect on rubber NBR (nitrile butadiene rubber), SBR (styrene butadiene rubber) and natural rubber are immersed in the undiluted solution of the cleaning composition for 30 minutes and then left for 5 minutes to determine the weight change rate before and after immersion. It was calculated from the formula.

Formula ₁ ΔW = (W ₁ −W ₀ ) / W ₀ × 100 where ΔW: weight change rate (%) W ₀ : weight before immersion W ₁ : weight after immersion

3. Flash point measurement The undiluted solution of the cleaning composition was measured with a tag closed flash point measuring device, which is a test method based on the Fire Service Act, and classified according to the Fire Service Act.

4. Dryability A stock solution of the cleaning composition is uniformly sprayed for 5 seconds on a brake lining for a drum brake with a hand-jet pump. Then, the time until the entire surface of the brake lining is dried is measured. Further, the aerosolized cleaning agent was uniformly sprayed for 5 seconds, and the time was measured in the same manner.

5. Odor Sensory determination of odor was performed on 10 stock solutions of the detergent composition. Judgment Criteria I don't care about odors .... ○ I'm worried about odors but I can put up with it. △

According to the above test method, Examples 1 to 6 in Table 1 were performed.
Of cleaning agents were tested. Further, for comparison, the same tests were performed on Comparative Examples 1 to 5 in Table 2.

[0026]

[Table 1]

[0027]

[Table 2]

The test results of Examples and Comparative Examples are shown in Tables 3 to 6.

[0029]

[Table 3]

[0030]

[Table 4]

[0031]

[Table 5]

[0032]

[Table 6]

As is clear from the results shown in Tables 3 and 4,
In all of the examples, it was confirmed that good cleaning properties were confirmed and that there was no adverse effect on the parts around the brake device. Furthermore, within this blend range, the flash point is 21 ° C or higher, and it belongs to the second petroleum group under the Fire Service Law classification. Further, the drying time was between 3 minutes and 10 seconds and 4 minutes, and it was found from this result that the actual work has a drying property within a range that does not hinder the work. In addition, since the general drying time of the conventional cleaning agents belonging to the second petroleum group is about 5 minutes to 6 minutes or more, the efficiency of the cleaning operation of the brake device is within the range of the invention. It was confirmed to be improved.

Further, in Example 4, by adding n-propanol to the mixed liquid of 1-methoxy-2-propanol and 1,2-dichloropropane, the drying time can be shortened without deteriorating the washing property. it can. Also,
In Example 5, the same effect could be obtained by adding ethylene glycol diethyl ether. Furthermore, in Example 6, it was possible to improve usability by forming an aerosol.

It is also similarly confirmed that all of Examples 1 to 6 have detergency, compatibility with rubber and the like, and property of sufficiently functioning as a detergent in odor.

On the other hand, as is apparent from the test results of Comparative Examples in Tables 5 and 6, in Comparative Example 1, since the compounding ratio of 1,2-dichloropropane was 70% by weight, the fat solubility was high, As well as having an adverse effect on rubber, etc., it is the result of belonging to Daiichi Petroleum. Further, in Comparative Example 2, when n-propanol was used instead of 1-methoxy-2-propanol, detergency, flammability, odor and the like deteriorate.

Furthermore, in Comparative Example 3, when Isopar G (isoparaffin having 10 to 11 carbon atoms, manufactured by Exxon Chemical Co.) was used instead of 1,2-dichloropropane, there was no particularly remarkable blending effect, and comparison was made. Example 4 and Comparative Example 5
In Comparative Example 4, compatibility with rubber etc., flammability, drying property, and odor were adversely affected, and in Comparative Example 4, it belongs to Daiichi Petroleum, and in Comparative Example 5, it is a non-dangerous substance. However, it is a solvent that has a great adverse effect on the human body, and is subject to CFC regulations.

[0038]

As explained above, according to the present invention, 1-methoxy-2-propanol, which is the second petroleum, and 1,2-dichloropropane, which is the chlorine-based solvent for the first petroleum, are blended in a certain amount. By mixing within the range of the ratio, it becomes a cleaning agent for a brake device that has quick drying properties and second oils, which are contradictory attributes of the cleaning agent, without impairing the function as the cleaning agent. Therefore, the cleaning work of the brake device can be performed promptly, and the practical effect thereof is remarkable.

Claims (3)

[Claims] 1. A cleaning agent for a brake device comprising 90 to 50% by weight of 1-methoxy-2-propanol and 10 to 50% by weight of 1,2-dichloropropane. 2. The cleaning agent for a brake device according to claim 1, wherein an organic solvent having a flash point of less than 21 ° C. is added and the flash point is 21 ° C. or more. 3. The cleaning agent for a brake device according to claim 1, which is used as an aerosol by adding a propellant.