JPH04136099A - Cleaning agent for brake - Google Patents

Abstract

PURPOSE:To obtain a cleaning agent for a brake which can prevent rubber and a coating film from deteriorating, can suppress odor, has improved cleaning power and can dry quickly by compounding a specific aliphatic hydrocarbon with ethylcyclohexane. CONSTITUTION:30-60 parts by weight, preferably 40-50 parts by weight aliphatic hydrocarbon having 8 to 10 carbon atoms and containing a fraction boiling at 145 to 165 deg.C is compounded with 40-70 parts by weight, preferably 50-60 parts by weight, ethylcyclohexane to obtain a cleaning agent for a brake.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a detergent for a brake device, and particularly to a detergent for a brake device suitable as a detergent for a rotating body of a brake device of a vehicle or the like.

[Prior Art] As a friction brake device for an automobile, a device in which a brake shoe with a brake lining is actuated as a brake on a rotating body such as a brake disc or a brake drum has been generally used.

In order to prevent dust generated from this brake lining material etc. from adhering to brake discs etc. and having a negative effect on brake operation, we also prevent dust from asbestos used in brake lining from having a negative impact on workers. To prevent this from happening, cleaning agents specifically designed for brake equipment have been developed and used.

Such cleaning agents for brake equipment include hydrocarbon solvents such as toluene, xylene or 1.1.1-trichloroethane, or chlorinated reconstituted hydrogen solvents,
Mixed solvents with alcoholic solvents such as methanol and ethanol (Japanese Patent Publication No. 58-44118) and 1.1.2-trichloro-1,2,2-trifluoroethane (Freon 11)
Mixed solvents of 3) and methanol, isopropyl alcohol, etc. are known.

[Problems to be Solved by the Invention] However, the above combination of cleaning agents has the following problems.

1. Regulation of use by Organic Solvent Poisoning Prevention Ordinance 2. Regulation of storage location and quantity by Fire Service Act (Category 4 - Petroleum) 3. Global environmental destruction due to ozone layer destruction 4. Unique odor and irritation Deterioration of the working environment due to odor 5. This can cause deterioration of the rubber parts and paint around the brake system.

In addition, in recent years, since the brake device is assembled immediately after cleaning, it is required that the cleaning agent be dried within a certain period of time.

Therefore, it is desired to provide a cleaning agent that solves the above five problems without reducing the drying rate.

[Means for Solving the Problems] As a result of research, the inventor of the present application discovered that the above-mentioned needs could be met by combining certain organic solvents,
The invention has been completed.

That is, the present invention has 8 to 10 carbon atoms and 14 fractional components.
The conventional problems were solved by using a composition consisting of an aliphatic hydrocarbon and ethylcyclohexane having a temperature of 5°C to 165°C as a detergent for brake equipment.

Ethylcyclo\xane, which is the main component of the detergent for brake equipment of the present invention, is a naphthenic hydrocarbon having 8 carbon atoms.
It has the following characteristics.

1. It does not fall under the Organic Solvent Poisoning Prevention Ordinance and has little effect on the human body. 2. It does not destroy the ozone layer. 3. The odor is weaker than other solvents. 4. The drying speed is higher than other solvents. However, on the other hand, Ethylcyclohexane has a flash point of 19° C. and has the disadvantage of belonging to the first class of petroleum.

On the other hand, the number of carbon atoms that can be blended in ethylcyclohexane is 8 to 1.
Aliphatic hydrocarbons whose fractional components are 145°C to 165°C include isoparaffins, naphthenes, etc.
These also have the above-mentioned first to third characteristics like ethylcyclohexane, and many of them belong to the second class of petroleum.

However, these aliphatic hydrocarbons have the disadvantage of slow drying rates.

In the present invention, the ethylcyclohexane and the carbon number 8 to 10 are
and an aliphatic hydrocarbon whose fractionated component is 145°C to 165°C are blended in a predetermined ratio, and the resulting mixed solvent compensates for the shortcomings of both components.A cleaning product that overcomes the shortcomings of conventional brake cleaning agents. It was discovered that it can be used as a drug.

The mixing ratio of these components is appropriately 30 to 60 parts by weight of aliphatic hydrocarbons having 8 to 10 carbon atoms and fractionated components of 145 to 165 degrees Celsius, and 40 to 70 parts by weight of ethylcyclohexane, and more preferably the former. It is preferable to mix the former in an amount of 40 to 50 parts by weight, and the latter in an amount of 50 to 60 parts by weight.

If the proportion of ethylcyclohexane used is less than 40 parts by weight, the drying rate will be low, and if it is more than 70 parts by weight, it will belong to the first petroleum class.

Furthermore, if aromatic hydrocarbons are used instead of aliphatic hydrocarbons, the rubber and paint film will deteriorate, and the organic solvent poisoning prevention regulations will apply.

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

Test method (1) Solubility (cleanability) Take 20 ml of the stock solutions of the various compositions shown in the Examples and Comparative Examples in a test tube, add 21 of each of the oils shown below to the stock solution, and check whether they are compatible. Visually observe.

Judgment Transparent and compatible ○ Approximately dissolved (suspension or sedimentation) Test specimen 1) Mineral engine oil 2) Synthetic engine oil 3) Brake fluid 4) Gear oil (2) Effect of undiluted solution on rubber Weigh a test piece of 2 x 25 x 100 mm, immerse the test piece in the various composition stock solutions shown in Examples and Comparative Examples at room temperature (25°C) for 30 minutes, then take it out and wipe off the stock solution completely with a rag. Measure the weight and calculate the weight change rate using the following formula.

X= (B-A)/AX100 However, X: Mass change rate A: Mass of test piece before immersion B; Mass of test piece after immersion Test specimen 1) Natural rubber 2) S B R 3) NBR (3) Paint film resistance A tM resin ring with an inner diameter of about 38 mrx is fixed to a predetermined painted plate in a room at a room temperature of 25° C. and a humidity of 60% to prevent liquid from leaking. Drop 5ml of the sample into the ring.

After heating in this state for 4 hours in an atmosphere of 60°C, the coated board was taken out and washed with water.

Wipe off the water and check for any abnormalities in appearance. In addition, the adhesion force was observed by the change in gloss rate and the board grain test (2 mm intervals).

(4) With the lining surface of the dry brake lining facing upward, apply 20 ml of various composition sources evenly over the entire surface of the lining. Then, measure the time until the entire surface dries.

(5) Flash point (Fire Service Act classification) Flash point tags of various compositions of Examples and Comparative Examples are measured using a closed type flash point measuring device.

Examples 1-4. Comparative examples 1 to 3 A cleaning agent with the following composition was prepared.

Example 1 Exesol D30 (Mixture of Exxon Chemical Co., Ltd. with 9 to 1 carbon atoms and isoparaffin) Ethylcyclohexane Example 2 Exesol D30 Ethylcyclohexane Example 3 Exesol D30 Ethylcyclohexane Example 4 Exesol D30 Ethylcyclohexane Comparative Example 1 Toluene Isopropyl alcohol Comparative Example 2 60 parts by weight O naphthene 40 parts by weight 50 parts by weight 50 parts by weight 40 parts by weight 60 parts by weight 30 parts by weight 70 parts by weight 20 parts by weight 80 parts by weight 1.1.1. - Trichloroethane ethanol Comparative Example 3 Toluene xylene 65 parts by weight 35 parts by weight 50 parts by weight 50 parts by weight [Effect of the invention 1 As is clear from the above explanation, the detergent for brake equipment according to the present invention has good cleaning properties. It has strong strength and drying properties, does not deteriorate rubber or paint films, has a weak odor, and is classified as a class 2 petroleum under the Fire Service Act, so it is not subject to the Organic Solvent Poisoning Prevention Ordinance, and its practical effects are remarkable. It is.

It is also possible to add some fragrance and less than 5% alcohol to the above formulation.

Claims (1)

[Claims] A detergent for brake equipment comprising an aliphatic hydrocarbon having 8 to 10 carbon atoms and a fractional distillation component of 145°C to 165°C and ethylcyclohexane.