JP2004307839A - Azeotrope-like detergent composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an azeotrope-like detergent composition suitable for deterging lead-free solder flux without using a halogen-based solvent, having excellent deterging power to a smudge in a partly denatured or carbonized state because of reflowing the lead-free solder flux at a high temperature, requiring no rinsing, and capable of using even under conditions of being repeatedly recovered by distillation. <P>SOLUTION: This azeotrope-like detergent composition comprises 3-methoxy-3-methyl-1-butanol and at least one kind of saturated alicyclic hydrocarbons selected among methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides at least one kind of saturation selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. The present invention relates to an azeotropic detergent composition comprising an alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol.

  More specifically, it has excellent detergency against fluxes remaining during soldering work of automobiles, electric appliances, electronics, machinery, precision equipment, etc., and is particularly suitable for cleaning lead-free solder flux that requires reflow at high temperatures. The present invention relates to an azeotrope-like composition which does not require rinsing and can be used even under conditions of repeated distillation and recovery.

  2. Description of the Related Art Sn-Pb eutectic solder has been used for many years when soldering automobiles, electric machines, electronics, machines, precision instruments, and the like. However, in recent years, the elution of lead from waste substrates of electronic devices and the like due to acid rain has an adverse effect on human bodies as well as water pollution, and has thus attracted much attention as a social problem. In view of such environmental problems, lead-free solders that do not use lead are being actively developed along with worldwide lead regulations, and have already been put to practical use.

  Except for some alloys, lead-free solder has a higher melting point by 30 ° C. or more than lead-containing solder. Therefore, when using lead-free solder, reflow must be performed at a temperature (250 ° C. or higher) higher than the reflow temperature (normally 230 ° C. or lower) of lead-containing solder. When the reflow is performed at such a high temperature, the flux is partially altered or carbonized, and the detergency that can be satisfied with any of the 1,1,1-trichloroethane and CFC-113 alternative cleaning agents that have been proposed so far, The required items such as safety and economy cannot be satisfied.

  In other words, the water-based cleaning agent has the advantage of not being flammable, but has low cleaning power, and is liable to cause stains and corrosion problems on metal parts, and has ancillary facilities for rinsing, drying, wastewater treatment and the like and space therefor. There are many problems, such as the need for

  Hydrochlorofluorocarbons such as HCFC-225 and HCFC-141b can be treated as non-aqueous nonflammable solvents, but they have been additionally specified as ozone depleting substances, and their total abolition time has been decided. Hydrofluorocarbons also have zero ozone depletion potential, but have a higher global warming potential than HCFCs and halogenated solvents, and are likely to be regulated in the future in terms of global warming. Can not be.

  Alcohol-based solvents and glycol ether-based solvents do not have the above-mentioned major problems such as global environmental problems and facilities, but alcohol-based solvents do not have very good detergency and have a low flash point at room temperature. There is a danger of catching fire, and glycol ether-based solvents are also poor in detergency, and furthermore, in terms of thermal stability, both of them are significantly degraded by heating and have a risk of adversely affecting cleaning performance and the like.

Hydrocarbon solvents exhibit excellent detergency against dirt such as processing oils and mineral oils, but have very poor detergency against polar substances such as solder flux or rosin flux, so alcohols, ethers, ketones, Non-aqueous detergents containing a polar compound such as glycol ether have been proposed (for example, Patent Documents 1 to 4).

  However, in the technology disclosed in these patents, the solder flux or rosin-based flux that has been reflowed at a normal temperature can be washed, but a part of the flux for lead-free solder is deteriorated or deteriorated by reflowing at a high temperature. The detergency against carbonized soil is inadequate.

  In addition, the technology (for example, Patent Document 5) proposed by the present inventors discloses that it shows sufficient detergency against dirt reflowed at a high temperature, but the main component is aromatic. There are concerns about the effects on health due to being hydrocarbons, and it cannot be said that the cleaning agent satisfies the requirements in terms of safety.

  Therefore, at present, chlorinated solvents such as dichloromethane, trichloroethylene, and tetrachloroethylene, which are strictly regulated, are used for such stains.

JP-A-7-268391

JP-A-7-331291 JP-A-9-59680 JP-A-2002-12895 JP 2001-220598 A

  An object of the present invention is to provide an excellent cleaning method for dirt that has been partially altered or carbonized by reflowing a lead-free solder flux at a high temperature without using a halogen-based solvent such as dichloromethane, trichloroethylene, and perchlorethylene. It is an object of the present invention to provide an azeotropic detergent composition which has power, does not require rinsing, and can be used even under conditions where it is repeatedly distilled and recovered.

  Under these circumstances, the present inventors have conducted various studies to solve the above-mentioned problems, and as a result, have found the desired azeotropic composition and completed the present invention.

  That is, the present invention is at least one or more selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. The present invention provides an azeotropic detergent composition comprising a saturated alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol.

  Hereinafter, the present invention will be described in more detail.

  The azeotropic-like cleaning composition of the present invention provides an azeotropic-like cleaning exhibiting excellent cleaning power for stains that have been partially altered or carbonized by reflowing a flux for lead-free solder at a high temperature of 250 ° C. or higher. Agent composition comprising at least one selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. A composition composed of at least one kind of saturated alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol, and whose composition and properties hardly change even when washing and distillation are repeated. Ah .

  The composition of the azeotropic composition for cleaning a lead-free solder flux in the present invention is such that the content of at least one or more saturated alicyclic hydrocarbons selected from methyldecalin, pentylcyclohexane and hexylcyclohexane is 35 to 50% by weight. %, The content of 3-methoxy-3-methyl-1-butanol is preferably 50 to 65% by weight.

  In the case of at least one or more kinds of saturated alicyclic hydrocarbons selected from propylcyclohexane, ethylmethylcyclohexane, and methylpropylcyclohexane, the content is 60 to 80% by weight, and the content of 3-methoxy-3-methyl-1-butanol is Preferably, the amount is from 20 to 40% by weight.

  In the case of trimethylcyclohexane, an azeotropic composition having a content of 75 to 80% by weight and a content of 3-methoxy-3-methyl-1-butanol of 20 to 25% by weight is preferable.

  In the case of ethyldimethylcyclohexane, an azeotropic composition having a content of 65 to 70% by weight and a content of 3-methoxy-3-methyl-1-butanol of 30 to 35% by weight is preferred.

  In the case of diethylcyclohexane, an azeotropic composition having a content of 60 to 65% by weight and a content of 3-methoxy-3-methyl-1-butanol of 35 to 40% by weight is preferred.

  In the case of tetrahydrodicyclopentadiene, an azeotropic composition in which the content is 55 to 60% by weight and the content of 3-methoxy-3-methyl-1-butanol is 40 to 45% by weight is preferred.

  Table 1 shows typical examples of these azeotropic compositions.

本発明で用いるメチルデカリンとしては、例えば、１−メチルデカリン、２−メチルデカリン等、プロピルシクロヘキサンとしては、例えば、ｎ−プロピルシクロヘキサン、イソプロピルシクロヘキサン等、エチルメチルシクロヘキサンとしては、例えば、１−エチル−２−メチルシクロヘキサン、１−エチル−３−メチルシクロヘキサン、１−エチル−４−メチルシクロヘキサン、１−エチル−１−メチルシクロヘキサン等、トリメチルシクロヘキサンとしては、例えば、１，２，３−トリメチルシクロヘキサン、１，２，４−トリメチルシクロヘキサン、１，２，５−トリメチルシクロヘキサン、１，３，５−トリメチルシクロヘキサン、１，１，２−トリメチルシクロヘキサン、１，１，３−トリメチルシクロヘキサン、１，１，４−トリメチルシクロヘキサン等、ブチルシクロヘキサンとしては、例えば、ｎ−ブチルシクロヘキサン、イソブチルシクロヘキサン、ｓｅｃ−ブチルシクロヘキサン、ｔｅｒｔ−ブチルシクロヘキサン等、メチルプロピルシクロヘキサンとしては、例えば、１−メチル−２−プロピルシクロヘキサン、１−メチル−３−プロピルシクロヘキサン、１−メチル−４−プロピルシクロヘキサン、１−メチル−２−イソプロピルシクロヘキサン、１−メチル−３−イソプロピルシクロヘキサン、１−メチル−４−イソプロピルシクロヘキサン、１−メチル−１−イソプロピルシクロヘキサン等、エチルジメチルシクロヘキサンとしては、例えば、１−エチル−２，６−ジメチルシクロヘキサン、１−エチル−３，５−ジメチルシクロヘキサン、１−エチル−２，３−ジメチルシクロヘキサン、１−エチル−２，４−ジメチルシクロヘキサン、１−エチル−２，５−ジメチルシクロヘキサン、１−エチル−３，４−ジメチルシクロヘキサン、１−エチル−４，４−ジメチルシクロヘキサン、１−エチル−１，３−ジメチルシクロヘキサン、１−エチル−１，４−ジメチルシクロヘキサン等、ジエチルシクロヘキサンとしては、例えば、１、２−ジエチルシクロヘキサン、１、３−ジエチルシクロヘキサン、１、４−ジエチルシクロヘキサン等、ペンチルシクロヘキサンとしては、例えば、ｎ−ペンチルシクロヘキサン、（３−メチルブチル）シクロヘキサン、（２−メチルブチル）シクロヘキサン、（１−メチルブチル）シクロヘキサン、（２，２−ジメチルプロピル）シクロヘキサン、（１，２−ジメチルプロピル）シクロヘキサン等及びヘキシルシクロヘキサンとしては、例えば、ｎ−ヘキシルシクロヘキサン、（４−メチルペンチル）シクロヘキサン、（３−メチルペンチル）シクロヘキサン、（２−メチルペンチル）シクロヘキサン、（１−メチルペンチル）シクロヘキサン、（３，３−ジメチルブチル）シクロヘキサン、（２，２−ジメチルブチル）シクロヘキサン、（１，１−ジメチルブチル）シクロヘキサン、（１，２−ジメチルブチル）シクロヘキサン、（１，３−ジメチルブチル）シクロヘキサン、（２，３−ジメチルブチル）シクロヘキサン、（１，２，２−トリメチルプロピル）シクロヘキサン、（１，１，２−トリメチルプロピル）シクロヘキサン、（１−エチル−２−メチルプロピル）シクロヘキサン等が挙げられる。

As methyldecalin used in the present invention, for example, 1-methyldecalin, 2-methyldecalin and the like, as propylcyclohexane, for example, n-propylcyclohexane and isopropylcyclohexane, and as ethylmethylcyclohexane, for example, 1-ethyl- Examples of trimethylcyclohexane such as 2-methylcyclohexane, 1-ethyl-3-methylcyclohexane, 1-ethyl-4-methylcyclohexane and 1-ethyl-1-methylcyclohexane include 1,2,3-trimethylcyclohexane, , 2,4-trimethylcyclohexane, 1,2,5-trimethylcyclohexane, 1,3,5-trimethylcyclohexane, 1,1,2-trimethylcyclohexane, 1,1,3-trimethylcyclohexane, 1,1,4- Examples of butylcyclohexane such as lmethylcyclohexane include, for example, n-butylcyclohexane, isobutylcyclohexane, sec-butylcyclohexane, and tert-butylcyclohexane.Examples of methylpropylcyclohexane include 1-methyl-2-propylcyclohexane and 1-methylcyclohexane. Methyl-3-propylcyclohexane, 1-methyl-4-propylcyclohexane, 1-methyl-2-isopropylcyclohexane, 1-methyl-3-isopropylcyclohexane, 1-methyl-4-isopropylcyclohexane, 1-methyl-1-isopropyl Examples of ethyldimethylcyclohexane such as cyclohexane include 1-ethyl-2,6-dimethylcyclohexane, 1-ethyl-3,5-dimethylcyclohexane, 1-e 2,3-dimethylcyclohexane, 1-ethyl-2,4-dimethylcyclohexane, 1-ethyl-2,5-dimethylcyclohexane, 1-ethyl-3,4-dimethylcyclohexane, 1-ethyl-4,4- Examples of diethylcyclohexane such as dimethylcyclohexane, 1-ethyl-1,3-dimethylcyclohexane, 1-ethyl-1,4-dimethylcyclohexane and the like include 1,2-diethylcyclohexane, 1,3-diethylcyclohexane, 1,4 Examples of pentylcyclohexane such as -diethylcyclohexane include n-pentylcyclohexane, (3-methylbutyl) cyclohexane, (2-methylbutyl) cyclohexane, (1-methylbutyl) cyclohexane, (2,2-dimethylpropyl) cyclohexane, (1 , Examples of 2-dimethylpropyl) cyclohexane and the like and hexylcyclohexane include, for example, n-hexylcyclohexane, (4-methylpentyl) cyclohexane, (3-methylpentyl) cyclohexane, (2-methylpentyl) cyclohexane, and (1-methylpentyl) Cyclohexane, (3,3-dimethylbutyl) cyclohexane, (2,2-dimethylbutyl) cyclohexane, (1,1-dimethylbutyl) cyclohexane, (1,2-dimethylbutyl) cyclohexane, (1,3-dimethylbutyl) Cyclohexane, (2,3-dimethylbutyl) cyclohexane, (1,2,2-trimethylpropyl) cyclohexane, (1,1,2-trimethylpropyl) cyclohexane, (1-ethyl-2-methylpropyl) cyclohexane, etc. It is below.

  The present invention is at least one selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. An azeotrope-like detergent composition of a saturated alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol exerts an excellent effect, and a saturated alicyclic hydrocarbon, 3-methoxy-3 -Methyl-1-butanol alone cannot achieve the effects of the present invention.

  Saturated alicyclic ring selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene used in the present invention. Even if a saturated aliphatic hydrocarbon such as nonane, decane, undecane, dodecane, 2,2,4,6,6-pentamethylheptane, etc. is used in place of the formula hydrocarbon, a good cleaning effect can be obtained. Can not.

  As shown in the prior art, in a flux cleaning composition based on a hydrocarbon solvent, various glycol ether compounds are used to dissolve polar substances in the flux. As the glycol ether compound used, only 3-methoxy-3-methyl-1-butanol is effective in the present invention, and other glycol ether compounds such as ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, When diethylene glycol dimethyl ether, propylene glycol t-butyl ether, propylene glycol dimethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, and the like are used in the present invention, the desired effects are obtained. It can not be achieved to.

  That is, the present invention relates to at least one selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene. By using a saturated alicyclic hydrocarbon of the formula (1) in combination with 3-methoxy-3-methyl-1-butanol, a remarkable effect appears only for the first time. can get.

  The azeotropic detergent composition of the present invention includes methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclo. Decane, 2,2,4,6,6-pentamethyl as long as the azeotropic composition of a saturated alicyclic hydrocarbon selected from pentadiene and 3-methoxy-3-methyl-1-butanol is not hindered Saturated aliphatic hydrocarbons such as heptane; glycol ethers such as 3-methoxy-1-butanol and 1-acetoxy-3-methoxy-3-methylbutane; aliphatic alcohols such as n-heptanol and n-octanol; Ketones such as cyclohexanone, may also include esters such as ethyl lactate.

  The azeotropic detergent composition of the present invention includes antioxidants such as 2,6-di-tert-butyl-p-cresol (BHT), thymol and pyrocatechin, and copper such as benzotriazoles and benzothiazoles. And a zinc corrosion inhibitor.

  The azeotrope-like cleaning composition of the present invention is a liquid contaminated in cleaning such as partially deteriorated or carbonized soil by reflowing a flux for lead-free solder at a high temperature of 250 ° C. or higher. It is possible to regenerate and recover with a batch type or continuous type distillation machine without deteriorating the washing performance and the like. The distillation machine used is not particularly limited, but a vacuum (reduced pressure) distillation machine is usually used, and the system is a vacuum such as a kettle system, a propeller system, a thin film falling system, and a jet stirring system. A (reduced pressure) distillation machine can be used as appropriate.

  Using the azeotropic cleaning composition of the present invention, a method for cleaning metals, electrons, precision parts, etc. is not particularly limited. For example, immersion cleaning, ultrasonic cleaning, warming cleaning, shower cleaning, vacuum cleaning, etc. A washing method or the like is effective, and drying can be performed by warm air, suction, vacuum drying (drying under reduced pressure), or the like. In addition, a steam drying method under reduced pressure that combines rinsing and drying is also possible.

  The azeotrope-like cleaning composition of the present invention, in addition to the soil in which the flux for lead-free solder is partially altered or carbonized by performing reflow at a high temperature, a general soil, for example, a normal soil, It can also be applied to solder flux or rosin-based flux that has been reflowed at a temperature, or to stains such as wax, pitch, machine oil, and grease.

  The azeotropic cleaning composition of the present invention has excellent detergency against oils such as machine oil, grease, flux, wax, pitch, etc., and is particularly useful for cleaning fluxes for lead-free solder, which has been considered difficult to clean. It is a practical cleaning agent that is suitable and can be used under conditions where rinsing is unnecessary and repeated distillation and recovery are required. By using the azeotrope-like composition of the present invention, it has become possible to substitute a chlorinated solvent or the like in a field which was difficult due to insufficient cleaning ability.

  In each of the following examples, determination and confirmation of each azeotropic composition were performed by the following means.

<Determination of azeotropic composition>
In a 500 ml flask equipped with a reflux condenser, 300 g of a previously prepared mixture of a saturated alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol was placed, and while boiling in an oil bath, the temperature was raised after 30 minutes. When became constant, the compositions of the liquid phase and the gas phase in the flask were analyzed by gas chromatography, and the temperatures of the gas phase and the liquid phase at that time were measured.

  A vapor-liquid equilibrium curve of the mixed composition was created from the measurement results, and the azeotropic-like composition ratio was determined by confirming the composition ratio at which the composition of the gas phase and the composition of the liquid phase were almost the same.

<Confirmation of azeotropic composition>
300 g of a mixture of a saturated alicyclic hydrocarbon and 3-methoxy-3-methyl-1-butanol prepared based on the azeotrope-like composition ratio determined above was placed in a 500 ml distillation flask, and the number of theoretical plates was 20 Was distilled with a distillation apparatus. The distillate was collected while measuring the vapor temperature, and analyzed by gas chromatography to determine whether there was a change in the azeotropic composition ratio determined above.

  Hereinafter, typical examples of the present invention will be described, but the present invention is not limited thereto.

Example 1
Based on the above means, the azeotropic detergent composition was adjusted so that 2-methyldecalin was 40% by weight and 3-methoxy-3-methyl-1-butanol was 60% by weight. The lead-free solder flux was washed by Method 1 and Washing Method 2. Table 2 shows the results.

<Cleaning method 1>
A glass epoxy substrate (manufactured by Sanhayato Co., Ltd.) coated with copper on both sides of a 75 × 50 × 1 mm glass epoxy material is immersed in a lead-free solder flux (trade name: EC-19S-8, Tamura Seisakusho) at room temperature. After the solution was drained at room temperature for 30 minutes, reflow was performed in an oven at 250 ° C. for 2.5 minutes, and the product was further cooled at room temperature for 30 minutes to obtain an object to be washed.

  As shown in FIG. 1, 500 ml of a washing container 5 and a rinsing container 6 to which 300 ml of a detergent composition 7 has been added are filled with water provided with an ultrasonic oscillator (39 kHz / 200 W) 2 and a heater 3. The container was placed on a mesh-like mounting table 4 in the washing tank 1, and both containers were kept at 40 ° C.

First, the object to be cleaned was placed in the cleaning container 5 and subjected to ultrasonic cleaning for 0.5 minutes. The object to be cleaned after the cleaning was rinsed in the rinse container 6 by the same operation as the above-described cleaning method. After the rinsing, the object to be cleaned was taken out and dried with hot air, and the appearance of the object to be cleaned was visually observed.
[Criteria for visual observation]
：: No flux residue or white residue is observed at all.

    Δ: Flux residue or white residue is slightly observed.

    X: A flux residue or a white residue is remarkably observed.

<Cleaning method 2>
A lead-free solder flux (trade name: Alloy 305 OL213 88.5-3-M20, manufactured by Nippon Afa Metal Co., Ltd.) ) Was applied in six places in a size of about 2 mmφ, and then reflowed in an oven at 280 ° C. for 2.5 minutes, and further cooled at room temperature for 30 minutes to obtain an object to be cleaned.

A 500 ml washing container and a rinsing container were prepared, and 300 ml of the detergent composition was added to each container, and each was kept at 40 ° C. First, an object to be washed was placed in a washing container and washed with a magnetic stirrer for 20 minutes. The object to be washed after washing was placed in a rinsing container, and rinsed by the same operation as the above-described washing method. After the rinsing, the object to be cleaned was taken out and dried with hot air, and the appearance of the object to be cleaned was visually observed.
[Criteria for visual observation]
：: No flux residue or white residue is observed at all.

    Δ: Flux residue or white residue is slightly observed.

    X: A flux residue or a white residue is remarkably observed.

Examples 2 to 14 and Comparative Examples 1 to 30
The azeotropic composition of 2-methyldecalin and 3-methoxy-3-methyl-1-butanol of Example 1 was added to the detergent compositions of Examples 2 to 14 and Comparative Examples 1 to 30 shown in Table 1. Washing was carried out under the same operation and conditions as in Example 1 except for changing. Table 2 shows the cleaning test results.

FIG. 2 is a schematic diagram illustrating a cleaning system used in <cleaning method 1> of the first embodiment.

Explanation of reference numerals

1: Cleaning tank 2: Ultrasonic oscillator 3: Heater 4: Reticulated installation table 5: Cleaning container 6: Rinse container 7: Cleaning composition

Claims (8)

At least one type of saturated alicyclic carbon selected from methyldecalin, propylcyclohexane, ethylmethylcyclohexane, trimethylcyclohexane, butylcyclohexane, methylpropylcyclohexane, ethyldimethylcyclohexane, diethylcyclohexane, pentylcyclohexane, hexylcyclohexane and tetrahydrodicyclopentadiene An azeotropic detergent composition comprising hydrogen and 3-methoxy-3-methyl-1-butanol. The content of at least one or more kinds of saturated alicyclic hydrocarbons selected from methyldecalin, pentylcyclohexane and hexylcyclohexane is 35 to 50% by weight, and the content of 3-methoxy-3-methyl-1-butanol is 50 to 65%. 2. The azeotropic detergent composition according to claim 1, which is in weight percent. The content of at least one kind of saturated alicyclic hydrocarbon selected from propylcyclohexane, ethylmethylcyclohexane and methylpropylcyclohexane is 60 to 80% by weight, and the content of 3-methoxy-3-methyl-1-butanol is 20%. The azeotropic detergent composition according to claim 1, wherein the amount is from 40 to 40% by weight. The azeotropic cleaning composition according to claim 1, wherein the content of trimethylcyclohexane is 75 to 80% by weight, and the content of 3-methoxy-3-methyl-1-butanol is 20 to 25% by weight. The azeotropic detergent composition according to claim 1, wherein the content of ethyl dimethylcyclohexane is 65 to 70% by weight, and the content of 3-methoxy-3-methyl-1-butanol is 30 to 35% by weight. The azeotropic detergent composition according to claim 1, wherein the content of diethylcyclohexane is 60 to 65% by weight, and the content of 3-methoxy-3-methyl-1-butanol is 35 to 40% by weight. The azeotropic cleaning composition according to claim 1, wherein the content of tetrahydrodicyclopentadiene is 55 to 60% by weight and the content of 3-methoxy-3-methyl-1-butanol is 40 to 45% by weight. . The azeotropic cleaning composition according to any one of claims 1 to 7, which is for cleaning a lead-free solder flux.

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