JP2700922B2 - Cleaning agent for brake equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cleaning agent for a brake device, and more particularly to a brake excellent in safety and detergency, particularly suitable as a cleaning agent for a rotating body of a brake device such as a vehicle. The present invention relates to a cleaning agent for an apparatus.

2. Description of the Related Art Conventionally, as a friction brake device for an automobile, a device in which a brake shoe with a brake lining acts as a brake on a rotating body such as a brake disk or a brake drum has been generally used.

In order to prevent dust and the like generated from the brake lining material and the like from adhering to the brake disc and affecting the operation of the brake, dust of asbestos used in the brake lining does not adversely affect the worker. Conventionally, cleaning agents dedicated to brake devices have been developed and used. As a cleaning agent for such a brake device, a hydrocarbon-based solvent such as toluene, xylene or 1,1,1-trichloroethane or a mixed solvent of a chlorinated hydrocarbon-based solvent and an alcohol-based solvent such as methanol, ethanol, etc. No. 58-44118) and 1,1,2-trichloro-1,2,2-trifluoroethane (hereinafter CFC 113)
A mixed solvent of ethanol, methanol, isopropyl alcohol and the like is known.

(Problems to be Solved by the Invention) However, the use of the above-mentioned combination of cleaning agents is regulated by the Organic Solvent Poisoning Prevention Law, and the storage location and the storage quantity are strictly regulated by the Fire Service Law (Class 4 Daiichi Sekiyu) ), And even if not regulated by the Organic Solvent Poisoning Prevention Law or the Fire Service Law, the use of the ozone layer will lead to global environmental destruction due to the destruction of the ozone layer.

Therefore, the cleaning equipment is excellent in cleanability of brake equipment and is not regulated by the Organic Solvent Poisoning Prevention Law. Is required.

(Means for Solving the Problems) The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, have found that the above-mentioned demand can be satisfied by combining certain organic solvents. Thus, the present invention has been completed.

That is, the present invention relates to a brake device cleaning agent comprising a combination of an aliphatic dihydric alcohol mono-lower alkyl ether and / or an aliphatic dihydric alcohol mono-lower alkyl ether acetate based on a paraffinic hydrocarbon having 12 to 16 carbon atoms, and And a monolithic aliphatic monohydric alcohol having 1 to 6 carbon atoms.

C12 which is a main component of the cleaning agent for a brake device of the present invention.
~ 16 paraffinic hydrocarbons include triisobretin trimer (2,2,4,6,6-pentamethylheptane) and triisobretin tetramer (2,2,4,7,9,9-hexa). Methyldecane), 2-monoethyldicyclohexane, 2-monopropyldicyclohexane, etc., and especially 2,2,4,6,6-
Pentamethylheptane is preferred.

These are not regulated by the Organic Solvent Poisoning Prevention Law, have little effect on the human body, and have the property of dissolving mineral grease well.

Examples of the aliphatic dihydric alcohol constituting the aliphatic dihydric alcohol mono-lower alkyl ether or the aliphatic dihydric alcohol mono-lower alkyl ether acetate to be blended with the above-mentioned paraffin-based hydrocarbon include monoethylene glycol, diethylene glycol, propylene glycol and the like. is there.

Examples of the lower alkyl group of lower alkyl ether and lower alkyl ether acetate include an alkyl group having 1 to 6 carbon atoms, such as methyl, ethyl, propyl, and butyl. Mono-lower alkyl ethers or mono-lower alkyl ether acetates of the above aliphatic dihydric alcohols include monoethylene glycol monomethyl ether, monoethylene glycol monoethyl ether, monoethylene glycol monobutyl ether and monoethylene glycol monoethyl ether acetate, propylene glycol. There are monomethyl ether acetate, propylene glycol monoethyl ether acetate and the like, and compounds having a total of 5 to 10 carbon atoms are used. These aliphatic dihydric alcohol mono-lower alkyl ethers and aliphatic dihydric alcohol mono-lower alkyl ether acetates dissolve mineral oils and synthetic oils relatively well. As a result, the mixed solvent obtained by blending with the above-mentioned paraffinic hydrocarbons can be used as a cleaning agent for brake equipment, so that dusts and oils can be thoroughly washed away, there is little effect on the human body, and the flash point is 21 ℃ or more, which is dangerous under the Fire Service Law. It is a cleaning agent classified as Class 4 Class 2 Petroleum. The mixing ratio is 5 to 95 parts by weight of paraffinic hydrocarbon, aliphatic dihydric alcohol mono-lower alkyl ether and / or aliphatic dihydric alcohol mono-lower alkyl ether acetate 95.
To 5 parts by weight, especially paraffinic hydrocarbon 60 to
80 parts by weight, more preferably 20 to 40 parts by weight of aliphatic dihydric alcohol mono-lower alkyl ether and / or aliphatic dihydric alcohol mono-lower alkyl ether acetate.

The above-mentioned aliphatic dihydric alcohol mono-lower alkyl ether and the aliphatic dihydric alcohol mono-lower alkyl ether acetate may be independently blended with the above-mentioned paraffinic hydrocarbon, but a combination of two or more kinds, particularly as described below The combination of various aliphatic monohydric alcohols and aliphatic dihydric alcohols mono-lower alkyl ethers and / or aliphatic dihydric alcohols mono-lower alkyl ether acetates allows the introduction of each component, and the type and blending amount of each component should be appropriately adjusted. When selected, a cleaning agent that can satisfy various conditions such as better cleaning properties, mild odor, an appropriate evaporation rate, and a flash point of 21 ° C. or higher can be obtained.

As the aliphatic monohydric alcohol preferably blended as the above-mentioned additional component, methyl alcohol,
There are aliphatic monohydric alcohols having 1 to 6 carbon atoms such as ethyl alcohol, isopropyl alcohol, and normal propyl alcohol, and a composition containing these aliphatic monohydric alcohols can dissolve mineral grease and synthetic oil well, If ethyl alcohol or normal propyl alcohol is used, the method is not regulated by the organic solvent poisoning prevention law.

The mixing ratio is 50 to 80 parts by weight of paraffinic hydrocarbon,
5 to 25 parts by weight of an aliphatic monohydric alcohol, 10 to 40 parts by weight of an aliphatic dihydric alcohol mono-lower alkyl ether acetate and / or an aliphatic dihydric alcohol mono-lower alkyl ether acetate give a cleaning agent having particularly good properties and performance. .

In addition, it is also possible to add a surfactant or another organic solvent in addition to the above-described components to the brake device cleaning agent of the present invention, but when the other organic solvent falls under the organic solvent poisoning prevention rule. Should be less than 5%. Also, it is necessary that water is not substantially present.

The cleaning agent of the present invention is mainly used for cleaning a rotating body of a brake device, but can also be used for a degreasing cleaning agent for mechanical parts.

(Examples) Next, the present invention will be described with reference to Examples and Comparative Examples. The mixing ratio is part by weight.

Test method (1) Solubility (detergency) Take 20 ml of the stock solution of each composition shown in Examples and Comparative Examples into a test tube, add 2 ml of each of the following oils to the stock solution, and visually check if they are compatible. Observe at

Judgment Transparently compatible ○ Compatible but turbid △ Not compatible at all × Specimen 1) Engine oil mineral 2) Engine oil synthetic oil 3) Brake fluid 4) Gear oil 5) Differential oil (2) ) Effect of stock solution on rubber A test piece of rubber was weighed 2 x 25 x 100 mm, immersed in a stock solution of each composition shown in Examples and Comparative Examples at room temperature (25 ° C) for 30 minutes, and then taken out. The stock solution is completely wiped off with a waste cloth, the test piece is weighed, and the weight change rate is calculated by the following equation.

Specimen weight after immersion-Initial specimen weight x 100 Initial specimen weight (3) Specimen (1) Natural rubber (NR) (2) SPR (3) NBR (4) EPDM (4) Flash point ( The fire points of the various compositions of Examples and Comparative Examples were measured with a tag-closed flash point measuring device.

Reference Example 1, Examples 1 and 2, Comparative Examples 1 to 5 A cleaning agent having the following composition was prepared.

(Reference Example 1) 100 parts by weight of 2,2,4,6,6-pentamethylheptane (Example 1) Isoparaffin (C = 12, Nippon Oil Corporation Isosol 3)
00) 65 parts by weight Propylene glycol monomethyl ether 35 parts by weight (Example 2) Naphthene (Nippon Petrochemical Naphthesol M) 50 parts by weight Propylene glycol monomethyl ether acetate 3
0 parts by weight Normal propyl alcohol 20 parts by weight (Comparative Example 1) Isopropyl alcohol 80 parts by weight Toluene 20 parts by weight (Comparative Example 2) 1,1,1-trichloroethane 65 parts by weight Ethanol 35 parts by weight (Comparative Example 3) Toluene 50 parts by weight Parts xylene 50 parts by weight (Comparative Example 4) Methanol 100 parts by weight (Comparative Example 5) Ethylcyclohexane 100 parts by weight Table 1 shows the results of testing these in accordance with the above test method.

As is apparent from Table 1, the cleaning agent for the brake device according to the present invention is a safe cleaning agent for second petroleums having good detergency, low toxicity and fire protection law, and its practical effect is remarkable.

Claims (2)

(57) [Claims] An aliphatic dihydric alcohol mono-lower alkyl ether having 5 to 10 carbon atoms and an aliphatic dihydric alcohol mono-lower alkyl ether acetate having 5 to 10 carbon atoms and a paraffinic hydrocarbon having 12 to 16 carbon atoms. A non-aqueous cleaning agent for a brake device, comprising at least one compound selected from the group consisting of: 2. A monovalent lower alkyl ether of an aliphatic dihydric alcohol having 5 to 10 carbon atoms and a mono-lower alkyl ether acetate of an aliphatic dihydric alcohol having 5 to 10 carbon atoms and a paraffinic hydrocarbon having 12 to 16 carbon atoms. A non-aqueous detergent for a brake device, comprising at least one compound selected from the group consisting of and an aliphatic monohydric alcohol having 1 to 6 carbon atoms.