JPH03153799A - Detergent for brake - Google Patents

Abstract

PURPOSE:To obtain the title detergent which is free from problems of safety and hygienic viewpoints and dries rapidly by combining a specified aliphatic hydrocarbon with an aliphatic dihydric alcohol mono(lower alkyl) ether (acetate) and a lower aliphatic monohydric alcohol. CONSTITUTION:An 8-11C aliphatic hydrocarbon (e.g. Exesol D30, a product of Exxon Chemical Co.) is combined with an aliphatic dihydric alcohol mono(lower alkyl) ether (acetate) (e.g. propylene glycol monomethyl ether) and a 1-4C aliphatic monohydric alcohol (e.g. n-propyl alcohol) to form the title detergent.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a cleaning agent for brake equipment, and more specifically, it has excellent safety and cleaning properties, and is particularly suitable for cleaning rotating bodies of brake equipment of vehicles, etc. The present invention relates to a detergent for brake equipment suitable as a detergent.

(Prior Art) As a friction brake device for an automobile, 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 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 avoid this problem, detergents specifically designed for brake equipment have been developed and are no longer in use.

Toluene,
A mixed solvent of a hydrocarbon solvent such as xylene or 1.1.1-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-trichloro -1
, 2,2-trifluoroethane (hereinafter referred to as Freon 113) and methanol, isopropyl alcohol, etc. are known as mixed solvents.

(Problem to be solved by the invention) However, the use of the above-mentioned cleaning agent combinations is regulated by the organic solvent poisoning prevention regulations, and the storage location and storage quantity are strictly regulated by the Fire Service Act (Category 4 - Petroleum ), and even if they are not regulated by the Organic Solvent Poisoning Prevention Ordinance or the Fire Service Act, there are many products whose use is severely restricted, such as because they lead to global environmental damage due to ozone layer depletion.

Therefore, we provide a cleaning agent that has excellent cleaning properties for brake equipment, is not regulated by organic solvent poisoning prevention regulations, is regulated under the Fire Service Act, and is safe and non-polluting for use and storage. is requested.

In addition, in recent years, in addition to the regulations for the prevention of organic solvent poisoning,
Due to the tendency to shorten the work time required to assemble the brake equipment immediately after cleaning, the drying time of the cleaning agent has become a major problem.

Conventional cleaning agents often dry slowly in order to comply with organic solvent poisoning prevention regulations, and after installation, the cleaning agent remains in the brake system without completely drying, which is also the cause of brake squeal. . Therefore, there is a demand for cleaning agents that dry quickly.

(Means for Solving the Problems) As a result of intensive research to solve the problems of the prior art as described above, the present inventor found that the above needs could be met by combining certain organic solvents. The present invention was completed.

That is, the present invention is based on an aliphatic hydrocarbon having 8 to 11 carbon atoms, an aliphatic dihydric alcohol mono-lower alkyl ether, an aliphatic dihydric alcohol mono-lower alkyl ether acetate, and an aliphatic monovalent ether having 1 to 4 carbon atoms. This is a detergent for brake equipment made in combination with alcohol.

8 to 1 carbon atoms as the detergent component of the brake device of the present invention
Examples of the aliphatic hydrocarbons in No. 1 include isoparaffins (having 9 to 11 carbon atoms), normal paraffins (having 8 to 11 carbon atoms), and naphthenes such as ethylsiloxhexane.

Among these, there are many that do not fall under the organic solvent poisoning prevention regulations, have little effect on the human body, and have high solubility in oils and fats.

Examples of aliphatic monohydric alcohols that can be blended with such aliphatic hydrocarbons include methyl alcohol, ethyl alcohol, isopropyl alcohol, and normal propyl alcohol. The composition dissolves mineral grease and synthetic oil well, and if ethyl alcohol or n-propyl alcohol is used as the alcohol, it is not regulated by organic solvent poisoning prevention regulations. In this case, it is necessary to keep the alcohol content to less than 20% in order to make this composition a secondary petroleum.

The aliphatic dihydric alcohols constituting the aliphatic dihydric alcohol mono-lower alkyl ether or aliphatic dihydric alcohol mono-lower alkyl ether acetate blended with the above-mentioned paraffinic hydrocarbons include monoethylene glycol, diethylene glycol, propylene glycol, etc. be.

The lower alkyl group of the lower alkyl ether and lower alkyl ether acetate includes alkyl groups having 1 to 6 carbon atoms, such as methyl, ethyl, propyl, butyl, and the like.

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, monoethylene glycol monoethyl ether acetate, propylene glycol Examples include monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and compounds having a total carbon number of 5 to 10 are particularly preferably 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, have a flash point of 21°C or higher, belong to the second class of petroleum, and their evaporation rates are also compared. Quickly,
The mixed solvent obtained by blending with the paraffinic hydrocarbon mentioned above is a cleaning agent for brake equipment that thoroughly washes away dust and oil, has little effect on the human body, has a flash point of 21°C or higher, and is classified as a dangerous substance according to the Fire Service Act. It is a cleaning agent classified as class 2 petroleum.

The mixing ratio of these components is 20 to 30 parts by weight of aliphatic hydrocarbon having 8 to 11 carbon atoms: 40 to 70 parts by weight of aliphatic dihydric alcohol mono-lower alkyl ether and/or aliphatic dihydric alcohol mono-lower alkyl ether acetate. : Aliphatic monohydric alcohol having 1 to 4 carbon atoms, preferably 5 to 20 carbon atoms.

If the proportion of aliphatic hydrocarbons having 8 to 11 carbon atoms used exceeds 30%, the erosivity to rubber increases, and if it does not exceed 20%, the detergency against oils and fats decreases. Further, in order to have appropriate drying properties, those having 8 to 11 carbon atoms are suitable.

Also, a ketone solvent having 5 to 9 carbon atoms or a ketone solvent having 5 to 9 carbon atoms
It is effective to mix this with an ether solvent. Specifically, methyl ethyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, methyl isobutyl ketone, methyl n-amyl ketone.

Examples include diethyl ketone, ethyl n-butyl ketone, diisobutyl ketone, di-n-butyl ketone, diisopropyl ketone, dipropyl ether, dibutyl ether, and diisopropyl ketone and dibutyl ether are preferred in terms of fire regulations and drying speed.

Ketone and ether solvents are advantageous in terms of increasing the evaporation rate, but if their blending amount exceeds 20%, they become more erosive to rubber, so they should be kept below that amount.

(Example) Next, the present invention will be explained with reference to Examples and Comparative Examples. Note that the blending ratio is in parts by weight.

Test method (1) Solubility (cleanability) Take 2.11 stock solutions of the various compositions shown in the Examples and Comparative Examples in a test tube, add 2.11 of each of the following oils to the stock solution, and check whether they are compatible. Visually observe.

Judgment Transparent and compatible ○ Compatible but cloudy Δ Not compatible at all Weighed a rubber test piece measuring 2 x 25 x 100 mm, immersed the test piece in the various composition stock solutions shown in Examples and Comparative Examples at room temperature (25°C) for 30 minutes, then took it out and wiped the stock solution completely with a rag. Weigh the test piece and calculate the weight change rate using the following formula.

Test piece weight after immersion - Initial test piece weight Initial test piece weight Test piece 1) Natural rubber (NR) 2) SPR 3) NBR 4) EPDM (3) The lining surface of the drying brake lining faces upward, 20 ml of stock solutions of various compositions are uniformly applied to the entire surface of the lining. Then, measure the time until the entire surface dries.

(4) Flash point (Fire Service Act classification) The flash point of various compositions of Examples and Comparative Examples was measured using a sealed tag flash point measuring device.

Examples 1-4. Comparative examples 1 to 5 A cleaning agent with the following composition was prepared.

Example 1 Exesol D30 30 parts by weight (Exxon Chemical Co., Ltd.) Mixture of naphthenes having 9 to 10 carbon atoms and isoparaffin) Propylene glycol monomethyl ether 60 parts normal propyl alcohol IC 3 parts by weight Example 2 Exesol D30 30 parts by weight (Exxon Chemical Co., Ltd.) (Mixture of naphthene having 9 to 10 carbon atoms and isobarafishi) Propylene glycol monomethyl ether 50 parts by weight Normal propyl alcohol 20 parts by weight Example 3 Normal paraffin (C=10) 20 parts by weight Propylene glycol monoethyl ether 60 parts by weight Normal Propyl alcohol 10 parts by weight Diisopropyl ketone 10 parts by weight Example 4 Ethylcyclohexane 20 parts by weight Propylene glycol monomethyl ether 60 parts by weight Normal propyl alcohol 10 parts by weight Normal butyl ether 10 parts by weight Comparative example 1 Ethylcyclohexane comparative example 2 Toluene Isopropyl alcohol comparative example 3 1.1.1-Trichloroethane Ethanol Comparative Example 4 Toluene xylene Comparative Example 5 Mineral spirit 100 parts by weight 20 parts by weight 80 parts by weight 65 parts by weight 35 parts by weight 50 parts by weight 50 parts by weight 100 parts by weight As is clear from Table (1) According to the present invention, the cleaning agent for brake equipment has good cleaning power, drying properties, is not applicable to the second petroleum class under the Fire Service Act, and is not subject to the Organic Solvent Poisoning Prevention Ordinance, and is therefore a safe cleaning agent, and its practical effects are Remarkable.

Claims (1)

[Scope of Claims] 1. An aliphatic hydrocarbon having 8 to 11 carbon atoms, an aliphatic dihydric alcohol mono-lower alkyl ether and/or an aliphatic dihydric alcohol mono-lower alkyl ether acetate, and an aliphatic hydrocarbon having 1 to 4 carbon atoms. Brake device cleaning agent made of monohydric alcohol. 2. The detergent for brake equipment according to claim 1, which contains a ketone solvent having 5 to 9 carbon atoms or an ether solvent having 5 to 9 carbon atoms.