JPH02247300A - Cleanser for brake device - Google Patents

Abstract

PURPOSE:To provide the subject cleanser not having any rubber-eroding property and having a sufficient cleansing power and excellent handling property and workability by containing an aliphatic dihydric alcohol monoalkyl ether (acetate) and an aliphatic monohydric alcohol as main components. CONSTITUTION:The objective cleanser contains (A) 10-90 pts.wt. (preferably 30-70 pts.wt.) of a 2-12C (preferably 5-10C) aliphatic dihydric alcohol mono lower alkyl ether (acetate) and (B) 90-10 pts.wt. (preferably 70-30 pts.wt.) of a 1-6C aliphatic monohydric alcohol (preferably 3-methyl-3-methoxybutanol or ethanol) as main components.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cleaning agent for spray equipment of automobiles and the like.

(Prior art and its problems) Generally used as a friction brake device for a motor vehicle is one in which a brake shoe with a brake lining acts as a brake on a rotating body such as a brake disc or a brake drum. In order to prevent dust generated from brake lining materials from adhering to brake discs and the like and adversely affecting brake operation, detergents specifically designed for brake equipment have been used in the past.

Toluene,
Xylene or 1.1.2- A mixed solvent of a hydrocarbon solvent such as trichloroethane or a chlorinated hydrocarbon solvent and an alcohol solvent such as methanol or ethanol (Japanese Patent Publication No. 58-44118) or 1.1.2- ) Lichloro-1,2,2-trifluoroethane (hereinafter referred to as Freon 113
), methanol, and isopropyl alcohol are known.

Although the former has good cleaning properties, it has a large effect on rubber, and both systems fall under the Organic Solvent Poisoning Prevention Regulations (hereinafter referred to as organic regulations), leading to the problem of contaminating the working environment. . The latter system, which uses a combination of fluorocarbon solvent and alcohol, has excellent cleaning power and has little effect on rubber and resin, and is currently the most widely used system. However, one of its main components, Freon 113, destroys the ozone layer, so restrictions on its use or discontinuation of its use have recently been considered on a global scale.

An object of the present invention is to provide a detergent for brake equipment that is not corrosive to rubber, has sufficient cleaning power for brake equipment, and is easy to select from a system that does not fall under organic rules.

(Means for Solving the Problems) The present invention mainly uses a mono-lower alkyl ether or mono-lower alkyl ether acetate of an aliphatic dihydric alcohol having 2 to 12 carbon atoms and an aliphatic monohydric alcohol having 1 to 6 carbon atoms. It is found in detergents for brake equipment as an ingredient.

Examples of the aliphatic dihydric alcohols constituting the mono-lower alkyl ether or mono-lower alkyl ether acetate of aliphatic dihydric alcohols, which are one of the main components of the detergent for brake equipment of the present invention, include monoethylene glycol and furopylene gellicol. , diethylene glycol, etc. The lower alkyl of the lower alkyl ether and lower alkyl ether acetate includes alkyl having 1 to 6 carbon atoms, such as methyl, propyl, butyl, and the like. Among the mono-lower alkyl ethers or mono-lower alkyl ether acetates of the above-mentioned aliphatic dihydric alcohols, those that are volatile and have monoethylene glycol monoethyl ether, monoethylene glycol monobutyl ether, monoethylene glycol monomethyl ether, and monoethylene glycol Compounds other than monoethyl ether acetate having a total carbon number of 5 to 10 are particularly preferably used.

The other main component, aliphatic monohydric alcohol, has 1 to 1 carbon atoms.
6, methanol, isobutyl alcohol, isopropyl alcohol, isopentyl alcohol,
Compounds other than 1-butanol and 2-butanol, such as 3-methyl-3-methoxybutanol and ethanol, are particularly preferably used.

The proportion of these two products used is 10 to 90 parts by weight = 90
-10 parts by weight, especially 30-70 parts by weight; a range of 70-30 parts by weight is preferred. If the proportion of mono-lower alkyl ether or mono-lower alkyl ether acetate of aliphatic dihydric alcohol used exceeds 90 parts by weight, the corrosivity to rubber increases;
When the amount exceeds 0 parts by weight, the cleaning power decreases.

The detergent of the present invention has the remarkable effect of suppressing the erosivity to rubber and exhibiting sufficient detergency due to the combination of the above two main components. It also has moderate evaporability and is excellent in handling and workability.

In addition, the above two main components include compounds that fall under the organic rule, such as monoethylene glycol monoethyl ether and methanol, but they also include many compounds that do not fall under the organic rule, such as propylene glycol monoethyl ether and ethanol. By combining these, it is possible to easily prepare a cleaning agent that not only has the above-mentioned effects but is also not regulated by organic regulations.

In addition to the above two main components, it is also possible to add surfactants and other organic solvents to the brake cleaning agent of the present invention.
If other organic solvents comply with the organic rule, the amount added should be 5% by weight or less.

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

Next, the present invention will be explained with reference to Examples and Comparative Examples. The blending ratio is in parts by weight.

Test method (1) Cleaning properties 200 ml stock solutions of various compositions shown in Examples and Comparative Examples
was aerosolized with 150 mj of LPG and used as a test specimen, sprayed on the grease coated with a uniform film thickness on a tin plate for a certain period of time, and the amount of grease removed at that time was measured.

Removal amount 200mg or more: 0100+n
g or more and 19'Jng or less: Δ99■ or less
:× As the grease, synthetic oil-based lithium soap was used.

(2) Rubber erodibility natural rubber test piece 2 x 25 x 100+ll
111 is immersed in the various composition stock solutions shown in Examples and Comparative Examples in room a (25° C.) for 2 hours, and then completely dried.

Rubber erodibility is measured by the difference in hardness before immersion and after immersion and complete drying.

(3) Drying property A certain amount of each of the covering materials shown in Examples and Comparative Examples was sprayed onto the surface of a vertical tin plate, and the drying time was measured.

25℃ 50%RH 5 minutes or less 206 minutes or more and 10 minutes or less: Δ 11 minutes or more: × Large flow! "Gotomi, Comparative Examples 1 to 4 The following components were blended in the following proportions, and the results shown in Table 1 were obtained.

Example 1 3-Methyl-3-methoxybutanol monoethyl ether 20 ethanol
80 Example 2 Propylene glycol monomethyl ether acetate-1.
60 ethanol
40 Example 3 Propylene Glycol Monoethyl Ether n-Proper Tool Example 4 Propylene Glycol Monoethyl Ethanol 1.1.1-) Lichloroethane Surfactant Thilacetate Example 5 Propylene Glycol Monomethyl Ether Acetate 6
01-Butanol
40 Comparative Example 1 3-Methyl-3-methoxybutanol monoethyl ether acetate Comparative Example 2 Ethanol Comparative Example 3 Toluene Methanol Comparative Example 4 1゜1.1-Trichloroethane Ethanol v (・4mi;'

Claims (1)

[Claims] A detergent for brake equipment, the main components of which are mono-lower alkyl ether or mono-lower alkyl ether acetate of aliphatic dihydric alcohol having 2 to 12 carbon atoms and aliphatic monohydric alcohol having 1 to 6 carbon atoms.