JPH0676579B2 - Aerosol agent for cleaning automobile brake equipment - Google Patents

Description

Description: [Industrial application] The present invention relates to an aerosol agent for cleaning an automobile brake device, and more specifically, it is used for cleaning a friction brake such as a drum brake and a disc brake of an automobile at the time of vehicle inspection and inspection. The present invention relates to an aerosol type cleaner.

[Prior Art] Brake devices for automobiles are washed and disassembled at the time of inspection and inspection to remove asbestos dust, which is abrasion powder of brake shoes, brake oil, and various brake greases. Asbestos dust is generated by friction between the brake lining on the surface of the brake shoe and the brake drum and brake disc, and gradually accumulates inside the brake device and the surface of the brake shoe as the brake is used. Poor performance. In addition, this asbestos dust mixes with brake grease used in brake equipment and leaked brake fluid, and adheres to rubber parts such as cylinder boots, which may contaminate the hands and fingers of workers or disperse grease when disassembling. It will reduce the performance.

When disassembling and checking the brake device, first remove the tires, wheels, brake drums, etc. to expose the brake shoes, and then use the asbestos dust,
Oil-based contaminants are removed, then the brake system is disassembled,
Inspection and replacement of parts are performed. The following performance is required for a cleaning agent for removing asbestos dust and oil-based contaminants. That is, (A) the brake shoe wear powder can be moistened and drained off, and the compatibility with both contaminants of alcohol-based brake fluids and oil-based gear oils and greases is great, and the cleaning power for these is great. (B) After cleaning and inspecting the brake device, check the braking force with a brake tester. If the brake device is assembled before drying, the braking force will be adversely affected, so the cleaning time for the braking device is 1 minute per car. The time required for assembly after cleaning is about 5 minutes on average, so it is necessary to dry within this time. (C) The worker is exposed to the vapor of the cleaning agent at the time of cleaning, which is toxic, It is desirable to have as little odor as possible. (D) The rubber parts such as cylinder boots installed as brake parts are damaged, the brake drum, It is necessary not to rust metal parts such as springs.

On the other hand, there are three general cleaning methods that are currently used.
There is a method.

A method of generating compressed air using a compressor to blow out dust.

Since dust is scattered in the air, the work environment is significantly contaminated. Further, asbestos dust may cause cancer, which is not preferable for the health of workers. Furthermore, it is difficult to remove oil-based contaminants.

A wet cleaning method using an aerosol agent containing a chlorine-based organic solvent as a main component.

Chlorine organic solvents (eg trichlorethylene, 1,1,1
-Trichloroethane, etc.) is a solvent that is highly toxic by steam in general, so it is a target substance of the Organic Solvent Poisoning Prevention Regulations based on the Industrial Safety and Health Act, and it is difficult to use because there are conditions at the workplace when using it. .

A wet cleaning method using an aerosol agent containing CFC 113 as a main component.

Although it has been the most general method in the past, it is easily estimated that it will be unusable in the near future in view of the recent CFC problem. That is, CFC 113, which is the main component, is a substance subject to CFC regulation, and the price is also rising.

[Problems to be Solved by the Invention] As described above, it is difficult to carry out the conventional method described above in the method for cleaning the automobile brake device. Therefore, it is an urgent need to develop a new method. ing. The present inventor has examined the non-CFC type aerosol agent for cleaning the brake device in consideration of the present situation. First, as a cleaning method, a wet method that does not scatter dust or the like is desirable, and tests and examinations were repeated on a cleaning solvent that can satisfy the above-mentioned necessary conditions. As a result, good knowledge was obtained and the present invention was achieved.

That is, the object of the present invention is to solve various problems in the conventional aerosol agent described above, does not scatter asbestos dust and oil-based contaminants into the atmosphere, and can be easily washed and dried in a short time. It does not damage resin parts and rubber parts, and has no adverse effect on the human body.
An object of the present invention is to provide an aerosol agent for cleaning automobile brake devices, which does not harm the working environment.

[Means for Solving the Problems] The means of the present invention for solving the above problems can be an aerosol agent having the following respective configurations (1) to (6). That is, (1) the aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
An aerosol agent used in an aspect of being dried as it is after washing, comprising an aliphatic dihydric alcohol lower alkyl ether having 1 to 6 carbon atoms and / or a derivative thereof, and a propellant gas for aerosolizing the above-mentioned components. An aerosol agent containing

(2) The aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
It is an aerosol agent used in the form of being dried as it is after washing, and has a flash point of 21 ° C or higher and lower than 70 ° C (belonging to the 4th category, 2nd petroleum category in the Fire Service Act and having about 7 to 12 carbon atoms)
As a main component, and a mixture of the above aliphatic saturated hydrocarbon with an aliphatic dihydric alcohol lower alkyl ether having 1 to 6 carbon atoms and / or a derivative thereof, and a propellant gas for aerosolizing the component. Aerosol agent.

(3) The aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
It is an aerosol agent used in a form of being dried as it is after washing, and has two hydrocarbon groups R and R '(where R and R'each represent an alkyl group having 2 to 6 carbon atoms) at an oxygen atom. ) Is bonded to an ether represented by an organic compound R-O-R 'and a propellant gas for aerosolizing the above components, which is a main component.

(4) The aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
It is an aerosol agent used in the form of being dried as it is after washing, and has a flash point of 21 ° C or higher and lower than 70 ° C (belonging to the 4th category, 2nd petroleum category in the Fire Service Act and having about 7 to 12 carbon atoms).
Saturated aliphatic hydrocarbons and two hydrocarbon groups on oxygen atom
R, R '(provided that R and R'each represent an alkyl group having 2 to 6 carbon atoms) are combined with an organic compound represented by R-O-R' and a mixture with the above-mentioned components. An aerosol agent whose main component is a propellant gas for forming an aerosol.

(5) The aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
An aerosol agent used in a mode of being dried as it is after cleaning, which is mainly composed of diethyl carbonate and a propellant gas for aerosolizing the diethyl carbonate.

(6) The aerosol can is filled and sprayed from the nozzle of the aerosol can onto the brake device to wash the brake device,
It is an aerosol agent used in the form of being dried as it is after washing, and has a flash point of 21 ° C or higher and lower than 70 ° C (belonging to the 4th category, 2nd petroleum category in the Fire Service Act and having about 7 to 12 carbon atoms).
An aerosol agent containing, as main components, a mixture of the aliphatic saturated hydrocarbon of 1. and diethyl carbonate, and a propellant gas for aerosolizing the components.

Is.

The cleaning liquid used as an aerosol has a high oil-fat solubility and requires the use of an organic solvent that dries quickly. Non-flammable organic solvents include methylene chloride, carbon tetrachloride, chloroform, etc. other than 1,1,1-trichloroethane, but usable solvents are organic solvent poisoning prevention regulations based on the Industrial Health Law. It is difficult to use because it is subject to.

In view of the current situation, flammable organic solvents have to be used. The flammable organic solvent is regulated in the amount handled as a Class 4 hazardous material under the Fire Service Law. This is the "specified quantity" and is specified by the flash point as shown in Table 1.

When handling more than the specified quantity of dangerous goods, it is necessary to set up a "reservoir" based on the Fire Service Law and store or handle them according to the technical standards specified by Cabinet Order. The first petroleum is a highly flammable solvent represented by gasoline, and penetrates and swells rubber parts of a brake device.
Further, since the first petroleum oil dries too quickly, contaminants are redeposited on the brake parts, and the designated quantity is small, so it is not preferable as a cleaning liquid for the brake device in consideration of physical distribution.

On the other hand, the third petroleum does not swell the rubber portion of the brake device, but on the other hand, it is extremely slow to dry, which is not preferable in terms of work.
However, the flash point belonging to No. 2 petroleum is 21 ℃ or higher 70
Aliphatic saturated hydrocarbons below ℃ (number of carbon atoms is about 7 ~
No. 12) does not swell rubber parts, does not dry slowly, and does not redeposit contaminants, so it is suitable as a cleaning liquid for brake equipment. For example, Exxsol D-30 (Exxon Chemical Company _{manufactured, C 7 1%, C 8} 14%, C 9 54%, consists C ₁₀ 30%, flash point 29 ° C.), Isopar G (Exxon Chemical Co. manufacturing, C ₉ 2%, C ₁₀ 73%, C ₁₁ or more 25%, with a flash point of 41 ° C), Exxon naphtha No. 5 (manufactured by Exxon Chemical Co., flash point of 42 ° C) and the like.

Therefore, the means of the present invention is the aerosol agent having the above-mentioned configuration (2).

Examples of the aliphatic dihydric alcohol lower alkyl ether having 1 to 6 carbon atoms and / or its derivative include propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol diethyl ether, and propylene glycol monomethyl ether acetate.

The cleaning liquid in the present invention is turned into an aerosol by the jet gas. That is, the cleaning liquid according to the present invention is filled with a necessary amount of injection gas for aerosolization to form an aerosol agent. The propellant gas to be filled is, for example, liquefied petroleum gas (LPG) having substantially 3 to 4 carbon atoms, dimethyl ether (DMG).
E), carbon dioxide, etc. The cleaning liquid and the spray gas are used by being filled in an aerosol can. A usual aerosol can can be used.

The ether represented by the organic compound R-O-R 'has R and R'having 2 to 6 carbon atoms, that is, any of ethyl group, propyl group, butyl group, pentyl group (aluminum group) and hexyl group. An alkyl group, for example n
-Butyl ether, aluminum ether, n-hexyl ether and the like.

In addition, diethyl carbonate (ethyl carbonate) or a mixture of diethyl carbonate with an aliphatic saturated hydrocarbon of Class 4 and 2 petroleum under the Fire Service Law has great cleaning properties, drying properties, and safety for rubber and resins. It is a solvent and can be made into a good aerosol by mixing with a propellant gas.

A mixture of an aliphatic saturated hydrocarbon and an aliphatic dihydric alcohol lower alkyl ether and / or a derivative thereof, a mixture of an aliphatic saturated hydrocarbon and an ether represented by R—O—R ′, or an aliphatic saturated carbon The mixing ratio of the two main agent components in the mixture of hydrogen and diethyl carbonate is not particularly limited, and can be freely set in consideration of cleaning property, drying property and the like.

Incidentally, the cleaning liquid of each of the above-mentioned aerosol agents is such that the rubber parts of the brake device are not swollen, and the wet detergency is not impaired, and other components such as the handling of the Fire Service Act are not changed. Aliphatic hydrocarbons, aromatic hydrocarbons, alcohols and the like can be mixed.

[Examples] Examples of the present invention will be described below. In the examples,% is used to mean% by weight.

Example 1 A rear wheel of a small passenger car and a brake drum were removed to expose a brake shoe. Dark brown asbestos dust was accumulated on the inside of the brake drum and on the surface of the brake lining, and dirt in a state where asbestos dust and oil-based contaminants were mixed adhered to the brake boot portion and the driving metal portion.

Propylene glycol monomethyl ether, an aliphatic dihydric alcohol lower alkyl ether (trade name: Kuraray
PGM, Kuraray Isoprene Chemical Co., Ltd.) 100% and LPG
36 g of gas and 13 g of carbon dioxide gas were filled in an aerosol can (can of can specification AE420), and a button with a nozzle (about 10 cm) was attached to the prepared aerosol agent (see Table 2). After placing the saucer on the lower part of the washing part, spraying the brake lining surface, brake boots, drive metal parts, etc. with this aerosol agent, as a result, the mixture of asbestos dust and cleaning liquid flows down to the saucer, and the brake lining surface and No dirt remained on the surface of the brake boots. After drying, the surface of the brake lining was rubbed with a cloth, but nothing was attached to the cloth. The drying time after the work was about 1 minute and 40 seconds, and there was no hindrance to the work (No. 3
Table, refer to the section of Example 1 in Table 4).

Example 2 Propylene glycol monomethyl ether which is an aliphatic dihydric alcohol lower alkyl ether (trade name: Kuraray
PGM) 50%, n-propyl alcohol 15%, Isopar G, which is an aliphatic saturated hydrocarbon (Exxon Chemical Co., Ltd.) 30
%, Toluene 5%, 357 ml, LPG gas 36 g, carbon dioxide gas 13 g are filled in an aerosol can, and a button with a nozzle (about 10 cm) is attached to the prepared aerosol agent (see Table 2).

The brake device was washed in the same manner as in Example 1 by using the aerosol agent of the aerosol can. As a result of the cleaning, a mixture of asbestos dust and cleaning liquid flowed down into the saucer, and no stain remained on the brake lining surface or the brake boot surface. After drying, the surface of the brake lining was rubbed with a cloth, but nothing was attached to the cloth. The drying time after the work is about 2 minutes,
There was no hindrance to the work (see Example 2 in Tables 3 and 4).

Example 3 100% dibutyl ether, 36 g LPG gas, and 13 g carbon dioxide gas
Aerosol can prepared by filling the aerosol can with
A button with a nozzle is attached to (see table).

The brake device was washed in the same manner as in Example 1 by using the aerosol agent of the aerosol can. Asbestos dust did not rise during cleaning, the asbestos dust and oil-based contaminants adhering to the parts were removed, and a mixture of the contaminant and the cleaning liquid was confirmed in the pan, and the cleaning effect of this aerosol was good. It was The drying time was about 1 minute and 30 seconds, but there was no problem in the actual work (see Example 3 in Tables 3 and 4).

Example 4 86% dibutyl ether, 9% Isopar G and 5 xylene
%, LPG gas 36 g and carbon dioxide gas 13 g were filled in an aerosol can, and a button with a nozzle was attached to prepare an aerosol agent (see Table 2).

The brake device was washed in the same manner as in Example 1 by using the aerosol agent of the aerosol can. Asbestos dust did not rise during cleaning, asbestos dust and oil-based contaminants adhering to the parts were removed, and a mixture of the contaminant and its cleaning liquid was confirmed in the pan, and the cleaning effect of this aerosol was good. there were. The drying time was about 1 minute and 40 seconds, but there was no problem in actual work (Tables 3 and 4).
See the Example 4 section of the table).

Example 5 100% diethyl carbonate, 36 g of LPG gas and 13 g of carbon dioxide gas were filled in an aerosol can, and a button with a nozzle was attached to prepare an aerosol agent (see Table 2).

The brake device was similarly washed using the aerosol agent of this aerosol can. Asbestos dust did not rise during cleaning, the asbestos dust and oil-based contaminants adhering to the parts were removed, and a mixture of the contaminant and the cleaning liquid was confirmed in the pan, and the cleaning effect of this aerosol was good. It was The drying time was about 1 minute and 20 seconds, but there was no problem in the actual work (see Example 5 in Tables 3 and 4).

Example 6 Diethyl carbonate 60%, Isopar G 35% and toluene 5%
Then, 36 g of LPG gas and 13 g of carbon dioxide gas were filled in an aerosol can, and a button with a nozzle was attached to prepare an aerosol agent (see Table 2).

The brake device was similarly washed using the aerosol agent of this aerosol can. Asbestos dust did not rise during cleaning, the asbestos dust and oil-based contaminants adhering to the parts were removed, and a mixture of the contaminant and the cleaning liquid was confirmed in the pan, and the cleaning effect of this aerosol was good. It was The drying time was about 3 minutes, but there was no problem in actual work.

Comparative Example 1 and Comparative Example 2 After removing the other wheels of a small passenger car of the same type as Example 1, Freon 113 was 355 g, trichlorethylene was 20 g, and n-
13g carbon dioxide in a cleaning solution consisting of 14g propyl alcohol
CFC-based aerosol agent (brake cleaner; see Comparative Example 1, Table 2), 1,1,1-trichloroethane 86.7%, xylene 8.7%, isopropyl alcohol 4.6
% Was used as the cleaning liquid, and the brake device was cleaned in the same manner as in Example 1 with the chlorine-based solvent aerosol agent (brake cleaner; see Comparative Example 2 and Table 2) filled with 40 g of LPG.

As a result, asbestos dust and oil-based contaminants adhering to the parts of both brake devices were removed, and no problem was found in the cleaning effect of the brake cleaners of Comparative Examples 1 and 2 (Tables 3 and 4). (See Comparative Example 1 and Comparative Example 2 in the table). However, in Comparative Example 1, the drying time was as fast as about 15 seconds, and the stain was dried before it fell on the tray, so it was necessary to use a large amount of cleaning liquid.

Next, the effect of each aerosol agent of Examples 1 to 6 and Comparative Examples 1 and 2 on the rubber material and the resin material was tested. This test was carried out by immersing each material in an aerosol cleaning solution for 30 minutes at room temperature and then leaving it for 5 minutes to obtain the weight change rate. At the same time, it was confirmed whether or not there was a change in appearance. The test results are shown in Table 5. As is clear from Table 5, Examples 1 to 6 and Comparative Example 1
Was good.

EFFECTS OF THE INVENTION Since the present invention is an aerosol agent, the cleaning liquid has momentum when used in an automobile brake device, is physically effective in removing and cleaning contaminants, and can be dried quickly. Moreover, it is easier to handle than the conventional spray gun. Further, according to the present invention, all the items (A) to (D) described above, which are required as a method for cleaning a brake device of an automobile, are satisfied. That is, asbestos dust, and can be easily washed in a short time without scattering oil-based contaminants, and further, by using a cleaning solvent that does not adversely affect the human body, it is useful for significantly improving the working environment, It is easy to dispose of the washed-out contaminants.

Further, since the aerosol agent of the present invention comprises a component that does not adversely affect the braking device, it does not cause any trouble to the braking device itself during and after use.

In particular, each of the present invention is an aerosol agent that is used in such a manner that it is filled in an aerosol can, sprayed from a nozzle of the aerosol can to a brake device, the brake device is washed, and then dried as it is after cleaning. By using the cleaning agent and the spray gas, it is possible to spray the cleaning liquid component directly to the cleaning without the need for further special spraying means of the cleaning liquid component, and after cleaning,
Since it can be dried as it is in a short time of, for example, 3 minutes or less, it is not necessary to spray compressed air for drying as in the conventional case, and the usability is good.

Claims (6)

[Claims] 1. An aerosol agent, which is used in such a manner that it is filled in an aerosol can and sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and after the cleaning, the product is dried as it is, the carbon atom having 1 to 1 carbon atoms. An aerosol agent for cleaning an automobile brake device, which comprises an aliphatic dihydric alcohol lower alkyl ether of 6 and / or a derivative thereof and a propellant gas for aerosolizing the above-mentioned components as main components. 2. An aerosol agent which is used in such a manner that it is filled in an aerosol can and sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and after drying, it is dried as it is, and has a flash point of 21 ° C. Above 70 ℃ (under the Fire Service Act
A mixture of an aliphatic saturated hydrocarbon having a carbon number of about 7 to 12) belonging to petroleum and an aliphatic dihydric alcohol lower alkyl ether having a carbon number of 1 to 6 and / or a derivative thereof, and the above-mentioned components. An aerosol agent for cleaning an automobile brake device, which is characterized in that a main component is a propellant gas for forming an aerosol. 3. An aerosol agent which is filled in an aerosol can, sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and then dried as it is after cleaning. An organic compound represented by R-O-R 'to which the hydrocarbon groups R and R' (wherein R and R'each represent an alkyl group having 2 to 6 carbon atoms) are bonded, and the above-mentioned components. An aerosol agent for cleaning an automobile brake device, which is characterized in that a main component is a propellant gas for forming an aerosol. 4. An aerosol agent which is used in such a manner that it is filled in an aerosol can and sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and after drying, it is dried as it is, and has a flash point of 21 ° C. Above 70 ℃ (under the Fire Service Act
Aliphatic saturated hydrocarbons belonging to petroleum and having about 7 to 12 carbon atoms, and two hydrocarbon groups R and R'on the oxygen atom (provided that R and R'each have 2 to 6 carbon atoms). A vehicle comprising a mixture of an organic compound R-O-R 'represented by an alkyl group) and an ether represented by R-O-R', and a propellant gas for aerosolizing the above-mentioned components as main components. Aerosol agent for cleaning brake equipment. 5. An aerosol agent, which is used in such a manner that it is filled in an aerosol can and sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and after drying, it is dried as it is. An aerosol agent for cleaning an automobile brake device, which comprises, as a main component, a propellant gas for converting diethyl into an aerosol. 6. An aerosol agent which is used in such a manner that it is filled in an aerosol can and sprayed from a nozzle of the aerosol can to a brake device to wash the brake device, and after drying, it is dried as it is, and has a flash point of 21 ° C. Above 70 ℃ (under the Fire Service Act
A vehicle brake characterized by being a mixture of an aliphatic saturated hydrocarbon having a carbon number of about 7 to 12) belonging to petroleum and diethyl carbonate, and a propellant gas for aerosolizing the above components and a main component. Aerosol agent for cleaning equipment.