JPH02302500A - Aerosol agent for cleaning of brake device of automobile - Google Patents

Abstract

PURPOSE:To obtain the subject aerosol agent harmless for human body without scattering of asbestos dust or oil-based contaminant nor damaging resin or rubber part material and readily able to be washed in a short time containing aliphatic saturated hydrocarbon having specific physical properties and injecting gas as principal ingredients. CONSTITUTION:(A) Aliphatic saturated hydrocarbon having 21 to 70 deg.C flash point such as kerosene (petroleum of second group in fourth species in the Fire Services Act) is mixed with (B) injecting gas composed of LPG, dimethyl ether and carbon dioxide gas, etc., and (C) 1 to 6C aliphatic monohydric alcohol, as necessary, then contained in the aimed aerosol agent as principal ingredients.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cleaning agent for cleaning automobile brake systems, and more particularly to an aerosol agent for cleaning friction brakes of automobiles.

[Prior Art] In general, a friction brake device for an automobile is composed of brake shoes and a brake drum or brake disc, etc., and applies braking force by hydraulically pressing the brake shoes against the brake drum or the like that rotates with the tires. It is a system for giving. The surface of the brake shoe is covered with a brake lining, which is usually made of asbestos bonded with resin, rubber, etc. to ensure wear resistance and noncombustibility.

This brake lining gradually wears out as the brake gear is used. As a result, asbestos dust is generated and adheres to the brake lining surface, brake drum, etc., and adversely affects brake performance. In addition to replacing brake oil, removing asbestos dust S is an important item during vehicle inspections. In addition, the dust and oil-based contaminants of brake devices adhere to rubber parts such as cylinder boots, etc., and this obstructs the work of operators by staining their hands during disassembly and inspection. During a vehicle inspection, the tires and brake drums are first removed, and after removing asbestos dust and oil-based contaminants using some cleaning method, the brake system is disassembled, inspected, and parts replaced, etc., but this cleaning method requires the following: It is as follows. In other words, (1) asbestos dust etc. should not be scattered during cleaning work, (2) after cleaning brake parts, dry them promptly so that you can move on to the next work, (3) after cleaning brake parts, especially No residue of cleaning ingredients will remain on brake linings, brake drums, etc. (4) No damage to rubber parts such as cylinder boots installed as brake parts, (5) No damage to metal parts such as brake drums or springs. (6) It must not cause any harmful effects on the human body (not be subject to organic solvent poisoning prevention regulations).

On the other hand, there are three common cleaning methods currently in use:
There are several methods.

■ One method is to use a compressor to generate compressed air and blow away dust.

Dust is scattered into the air, resulting in significant pollution of the working environment. Furthermore, asbestos dust is said to have the ability to induce cancer, so it is not good for the health of workers. Furthermore, it is difficult to remove oil-based contaminants.

■ Wet cleaning method using an aerosol agent whose main ingredient is a chlorinated organic solvent.

Chlorinated organic solvents (e.g. trichlorethylene, 1.1
．． 1-)-Dichloroethane, etc.) are generally highly toxic solvents due to their vapors, and therefore are subject to the Organic Solvent Poisoning Prevention Regulations based on the Industrial Safety and Health Act. For this reason, each workplace must satisfy the following requirements when using the product.

・Installation of local exhaust 8M or emission source secret equipment ・Selection of organic solvent work chief ・Working environment measurement ・Health examination ・Use of protective equipment ・Signboard installation ■ Wet type using an aerosol agent mainly composed of Freon 113 Cleaning method.

This was the most common method, but considering the recent problems with fluorocarbons, it is easy to assume that it will become unusable in the near future. In other words, the main component, fluorocarbon 113, is a substance subject to fluorocarbon regulations, and its price is also rising.

[Problems to be Solved by the Invention] As described above, since it has become difficult to actually implement the above-mentioned method for cleaning a brake device of an automobile, there is an urgent need to develop a new method.

In view of the current situation, the present inventor investigated a fluorocarbon-free aerosol agent for cleaning brake equipment. First, as a cleaning method, a wet method that does not scatter dust is preferable, and a cleaning solvent that satisfies the above-mentioned requirements was tested and investigated. As a result, we obtained good knowledge and achieved the present invention.

That is, the object of the present invention is to solve the various problems with the conventional aerosol agents mentioned above, and to provide a product that does not scatter asbestos dust and oil-based contaminants, can be easily cleaned in a short time, and can be used to clean resin parts. without damaging or rubber parts.
The object of the present invention is to provide an aerosol agent for cleaning automobile brake equipment which has no adverse effects on the human body and does not harm the working environment.

[Means for Solving the Problems] The means of the first invention for solving the above-mentioned problems has a flash point of 21°C or more and less than 70°C (Class 4, Class 2 under the Fire Service Act).
It is said to be an aerosol agent for cleaning automobile brake systems whose main components are aliphatic saturated hydrocarbons (such as petroleum) and propellant gas.

Under the Fire Service Act, the amount of flammable and flammable solvents that can be handled is regulated as a Class 4 hazardous substance. This is a "specified quantity" and is specified by flash point as shown in Table 1 below.

When handling hazardous substances that exceed the discharge rate specified in Table 1, please use the "
It is necessary to set up a "storage facility" and store or handle it based on technical standards specified by government ordinance. The first petroleum is a highly flammable solvent, typified by gasoline, and penetrates into the rubber parts of the brake device, causing them to swell. In addition, the first petroleum type dries too quickly, causing contaminants to re-adhere to brake parts, and the specified quantity is also small, so it is not preferred as a cleaning fluid for player equipment from a logistics standpoint.

On the other hand, while No. 3 petroleum does not swell the rubber part of the brake system, it dries extremely slowly, making it difficult to work with.

Undesirable. However, aliphatic saturated hydrocarbons, which belong to the second class of petroleum and have a flash point of 21°C or higher and lower than 70°C, do not swell rubber parts, dry slowly, and do not re-deposit contaminants, so they can be used as cleaning fluids for brake equipment. Are suitable. For example, Fsol D-30 (Exxon Chemical Co., Ltd.),
Examples include IP Solvent 1620 (Idemitsu Oil Co., Ltd.).

Roughly speaking, similar effects were obtained when an aliphatic monohydric alcohol was mixed with this aliphatic saturated hydrocarbon.

Therefore, the means of the second invention has a flash point of 21°C or higher and 70°C.
An automobile brake device whose main components are a mixture of a non-J (Class 4 Class 2 Ishiura Class under the Fire Service Act) aliphatic saturated hydrocarbon and an aliphatic monohydric alcohol having 1 to 6 carbon atoms, and an injection gas. It is considered to be an aerosol agent for cleaning.

A third aspect of the invention for solving the problems mentioned above is an aerosol agent composed of an aliphatic monohydric alcohol having 1 to 6 carbon atoms and a propellant gas. Number of carbon atoms: 1~
Examples of the aliphatic monohydric alcohol of No. 6 include methanol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, and tert-butanol.

The means of the fourth invention is an aerosol agent whose main components are a mixture of an aliphatic monohydric alcohol having 1 to 6 carbon atoms, water, and a propellant gas. An aqueous solution containing 60 parts by weight or less of an aliphatic monohydric alcohol having 1 to 3 carbon atoms is treated as a non-hazardous substance under the Fire Service Act, and has the feature that there is no restriction on the specified quantity.

The cleaning liquid of the present invention is aerosolized by a propellant gas. V, each cleaning liquid according to the present invention is filled with a necessary amount of propellant gas for aerosolization to form an aerosol agent. The injection gas to be filled is, for example, liquefied petroleum gas (LPG).
), dimethyl ether (DME), carbon dioxide gas, etc.

The cleaning liquid and propellant gas are used by filling them into a spray container.

A conventional spray container can be used.

The cleaning fluids of the above-mentioned inventions may contain other components, such as ester, to the extent that the rubber parts of the brake device do not swell, the wet cleaning properties are not impaired, and the handling of the Fire Service Act does not change. There is no problem even if it contains some amount of ketones.

[Example] The present invention will be explained in detail below.

Example 1 The rear wheel and brake drum of a small passenger car were removed to expose the brake shoes. Brown asbestos dust had accumulated on the inside of the brake drum and on the surface of the brake lining, and the brake boots and drive metal parts were stained with a mixture of asbestos dust and subsystem contaminants.

A button with a nozzle (approximately 101) is attached to an aerosol (see Example 1 in Table 2) made by formulating 357d of Fsol D-30 (Exxon Chemical Co., Ltd.), which is a second class petroleum, 35 g of LPG, and 13 g of carbon dioxide. After placing a tray under the brake shoe, the entire brake system including the surface of the brake lining and the brake drum were cleaned.

As a result, a mixture of asbestos dust and cleaning fluid flowed down into the tray, and dust on the surface of the brake lining and self-contaminated substances adhering to other parts were removed. After drying, I tried rubbing the surface of the brake lining with a cloth, but nothing stuck to the cloth. The drying time after the work was about 3 minutes and 30 seconds, which caused no particular problem in the work (see the section of Example 1 in Tables 3 and 4).

Comparative Examples 1 and 2 After removing the wheels of the small passenger car of Example 1, 355 g of Freon 113, 20 g of 1-lichlorethylene, n
- A fluorocarbon aerosol agent filled with 14 g of propyl alcohol as a cleaning liquid and 13 g of carbon dioxide gas (brake cleaner: Comparative Example 1, see Table 2), 1.1.1-trichloroethane 86.1%, xylene 8 .7%, isopropyl alcohol 4.6% as cleaning liquid, LPG 35g
The Play V device was cleaned in the same manner as in Example 1 using a chlorinated solvent aerosol (brake cleaner; Comparative Example 2, see Table 2) filled with chlorine-based solvent.

As a result, asbestos dust and self-contaminated substances adhering to the parts of both brake devices were removed, and no problems were observed with the cleaning effects of the brake cleaners of Comparative Examples 1 and 2 (Table 3 and Comparative Example 1 and Comparative Example 2 in Table 4
(see section). However, in Comparative Example 1, the drying time was fast, about 15 seconds, and the dirt dried before it fell onto the tray, so it was necessary to use a lot of cleaning liquid.

Example 2.3.4 Alcohol type (
Example 2.3) and water according to the formulation of Example 4 in Table 2.
Each alcohol type aerosol (Example 4) was prepared, and a brake device was cleaned in the same manner as in Example 1.

As a result, asbestos dust did not fly up during use with all three brake systems, asbestos dust and self-contaminated substances adhering to the parts were removed, and a mixture of the contaminants and cleaning liquid was confirmed on the receiver plate. The cleaning effects of each of the aerosol agents in Examples 2 and 3.4 were good. The drying time was approximately 1 minute for Example 2, approximately 1 minute and 30 seconds for Example 3, and approximately 10 minutes for Example 4, but there were no problems in actual work (according to the implementation of Tables 3 and 4). (See Example 2.3.4).

The adverse effects on rubber and resin materials were determined by immersing each material in an aerosol cleaning solution for 30 minutes at room temperature and then leaving it for 5 minutes to determine the rate of weight change.

At the same time, the presence or absence of any change in appearance was confirmed. The test results were as shown in Table 5. As is clear from Table 5, Examples 1 to 4 and Comparative Example 1 were all good.

(The following continues on the next page.) [Effects of the Invention] Since the first to fourth inventions are all aerosol agents, the cleaning fluid has a lot of force when used in brake equipment, and it physically prevents contamination. It is effective in removing and cleaning objects, can be dried quickly, and is as easy to handle as a conventional spray gun. The cleaning liquid components used in the first to fourth inventions all satisfy the provisions of the Fire Service Act and have no adverse effect on the human body, and are convenient for practical use.

Further, according to the first to fourth inventions, the above-mentioned (1) is required as a method for cleaning a brake device of an automobile.
It satisfies all of the items (6) to (6). That is,
Cleaning can be done quickly and easily without scattering asbestos dust and oil-based contaminants, and by using a cleaning solvent that does not have any negative effects on the human body, it can significantly improve the working environment. Disposal of removed contaminants is also easy. Naturally, the brake system will not be given the green light.

Claims (4)

[Claims] (1) A product for cleaning automobile brake equipment characterized by containing an aliphatic saturated hydrocarbon with a flash point of 21°C or higher and lower than 70°C (Class 4, Class 2 petroleum according to the Fire Service Act) and injection gas as the main components. Aerosol agent. (2) A mixture and injection of an aliphatic saturated hydrocarbon with a flash point of 21°C or more and less than 70°C (Class 4, 2nd petroleum under the Fire Service Act) and an aliphatic monohydric alcohol having 1 to 6 carbon atoms. An aerosol agent for cleaning automobile brake equipment characterized by containing gas as a main component. (3) An aerosol agent for cleaning automobile brake equipment, characterized by comprising an aliphatic monohydric alcohol having 1 to 6 carbon atoms and a propellant gas. (4) An aerosol agent for cleaning automobile brake systems, characterized in that the main components are a mixture of an aliphatic monohydric alcohol having 1 to 6 carbon atoms and water, and a propellant gas.