JPH069992A - Degreasing detergent composition - Google Patents

Abstract

PURPOSE:To obtain a degreasing detergent which is excellent in detergency and drying characteristics, is lowly toxic and lowly odorous, and scarcely impairs rubber parts by mixing a dimethyl-polysiloxane with a fluorinated hydrocarbon or an aliphatic saturated hydrocarbon. CONSTITUTION:The composition is obtained by mixing a dimethyl-polysiloxane with at least one of a fluorinated hydrocarbon and/or an aliphatic saturated hydrocarbon. The viscosity of the dimethylpolysiloxane to be used, which may vary depending on the degree of polymerization, is preferably 0.06-5cSt. If it is above 5cSt, drying characteristics will be poor and nonvolatile matter will remain; if below 0.06cSt, drying will be too fast and cleaning will be insufficient. The amount of the dimethyl-polysiloxane is preferably 20-95wt.%. If it is below 20wt.%, no improvement will be realized in the influence on rubber parts; if above 95wt.%, the detergency for oil or fat, such as grease, will be poor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degreasing method that uses dimethylpolysiloxane as an essential component, has excellent detergency and dryness, has a low poison and a low odor, and does not easily invade rubber parts. Detergent composition.

[0002]

2. Description of the Related Art Conventionally, fluorinated hydrocarbon compounds (hereinafter referred to as CFCs) and saturated aliphatic hydrocarbon compounds have been widely used as degreasing detergents.

Of these, 1,2-trichloro-1,2,2-trifluoroethane (R113) is used as the chlorofluorocarbon, but this compound has drawbacks such as swelling of rubber, but (1 ) Excellent in cleanability of oils and fats such as lubricating oil, wax, grease, etc. (2) Since it is excellent in drying property, it is possible to immediately proceed to the next step, (3) Since it completely volatilizes, it adversely affects the subsequent steps. It has excellent characteristics as a cleaning agent, such as: (4) low toxicity and low odor, (5) no corrosion on metal surface.

However, it is known that this compound is chemically stable and, when released into the atmosphere, diffuses into the stratosphere and destroys the ozone layer.

Therefore, for example, R113 may be mixed with 2,2-dimethylbutane (JP-A-2-215738), or
Mix 2-bromopropane and ethanol
No. 215736), a method of mixing another solvent with CFC has been attempted.

Further, in order to prevent ozone depletion of CFC itself, development of a substitute (alternative CFC) having a low ozone depletion potential is underway, and the ozone depletion potential of R113 is 20 to 20%.
It is reduced to 1/90 and other properties are similar to R113. As a detergent, 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R225ca), 1,3-dichloro- 1,2,2,
3,3-pentafluoropropane (R225cb) has been developed.

However, since the CFC substitutes still have ozone depletion ability, hydrocarbons (JP-A-2-
No. 204466), a surfactant and water (JP-A-2-204467), a surfactant (JP-A-2-204468), 1,1,3,
3-hexafluoro-2-propanol (JP-A-2-27328
Other techniques such as mixing (for example, Japanese Laid-Open Patent Publication) have been tried.

On the other hand, the aliphatic hydrocarbon compounds are excellent in cleaning oils and fats such as lubricating oils, waxes and greases, do not corrode metal surfaces, and do not have a risk of depleting the ozone layer like CFCs. Such detergents are disclosed in Japanese Examined Patent Publication No. 58-44118 and Japanese Unexamined Patent Publication No. 3-126794.

[0009]

However, since the cleaning agents disclosed in JP-A-2-215738 and JP-A-2-215738 each contain a hydrocarbon solvent, they are harmful to the human body. Yes, the low poisoning property of CFCs is impaired.

Further, since the cleaning agent disclosed in Japanese Patent Application Laid-Open No. 2-204467 uses water, the drying property is poor and the working speed is lowered, and further, there is a possibility of corrosion in cleaning the metal surface. The characteristics of are impaired.

Further, Japanese Patent Laid-Open Nos. 2-204467 and 2-20
The cleaning agent disclosed in Japanese Patent No. 4468 contains a surface active agent, but since this surface active agent is non-volatile, it may adversely affect the plating and coating processes after cleaning, and the cleaning solution is If it remains in the device, the device may not operate normally. To prevent this, if a rinsing process is added after cleaning, the number of working processes increases.

On the other hand, in addition to the problem that an aliphatic hydrocarbon compound is likely to cause swelling of rubber parts, like freon,
Since the cleaning agents disclosed in Japanese Patent Publication No. 58-44118 and Japanese Patent Application Laid-Open No. 3-126994 contain an aliphatic hydrocarbon as a main component, they are harmful to the human body and at the same time have a peculiar odor and dryness. Cleaning agents that use good hydrocarbons are highly flammable,
In addition, since the latent heat of vaporization is high, a large amount of heat is taken from the surface to be cleaned, and in some cases dew condensation may cause metal corrosion.

On the other hand, dimethylpolysiloxane is a compound having a chain or cyclic structure having a siloxane bond, and this compound is a liquid substance at room temperature, and (1) is chemically stable, (2) It is less toxic and less odorous than hydrocarbon compounds, (3) has less effect on plastics and rubber, (4) has a smaller latent heat of vaporization than organic compounds, and takes less energy from the surface to be cleaned, so metal surfaces It has features such as not corroding.

Of these compounds, those having a high viscosity are not completely volatilized and are used as a cleaning polish (Japanese Patent Laid-Open Nos. 3-192199 and 3-29632). Since the non-volatile component remains, there is a problem that it may adversely affect the subsequent processes and nearby devices.

The present inventors have dimethylpolysiloxane as an essential component, and by mixing one or more of fluorinated hydrocarbons and / or aliphatic saturated hydrocarbons with it, they have good detergency, It has been found that a degreasing detergent composition having excellent drying property, low toxicity and low odor, less likely to damage rubber parts, and capable of reducing the use amount of CFCs and saturated aliphatic hydrocarbons can be obtained.

[0016]

Based on the above findings, the present invention has dimethylpolysiloxane as an essential component, and one or more of fluorinated hydrocarbons and / or aliphatic saturated hydrocarbons is added thereto. It proposes a greasy detergent composition.

The dimethylpolysiloxane used in the present invention has various viscosities depending on its degree of polymerization, but in the present invention, the viscosity is preferably 0.06 to 5 cS, and when it is 5 cS or more, the drying property is poor and a non-volatile component is present. If it is less than 0.06cS, it will dry quickly and will not be washed sufficiently.

The compounding amount of dimethylpolysiloxane is 20 to 95
% Is preferable, and if it is 20% by weight or less, the effect on the rubber parts is not improved, and if it is 95% by weight or more, the cleaning property of oils and fats such as grease is poor.

The fluorine compound used in the present invention is, for example, 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R225ca), 1,3-dichloro-1,2,2,3, 3-pentafluoropropane (R225cb) with a compounding amount of 5
80% by weight is preferable, and if it is 5% by weight or less, oily dirt such as grease cannot be washed sufficiently, and if it is 80% by weight or more, the effect on rubber parts is not improved.

The saturated aliphatic hydrocarbon used in the present invention preferably has 5 to 10 carbon atoms, and when it has 4 or less carbon atoms, it is a gas at room temperature and has high flammability. When the carbon number is 11 or more, the drying property becomes poor.

The amount of the saturated aliphatic hydrocarbon blended is 5 to 80% by weight.
% Is preferable, and if it is 5% by weight or less, oily dirt such as grease cannot be sufficiently washed, and if it is 80% by weight or more, the effect on rubber parts is not improved.

[0022]

EXAMPLES Examples of the present invention will be shown below. The following compounds were used in Examples and Comparative Examples. Chain structure dimethylpolysiloxane (Product name: SH200 oil, viscosity 0.65cS, SH200 oil
Viscosity 3.0cS, SH200 oil viscosity 5.0cS, manufactured by Toray Dow Corning Silicone Co., Ltd.)

Cyclic structure dimethylpolysiloxane (trade name: SH344 oil, viscosity 2.5cS, manufactured by Toray Dow Corning Silicone Co., Ltd.)

1,1-dichloro-2,2,3,3,3-pentafluoropropane 1,3-dichloro-1,2,2,3,3-pentafluoropropane (trade name: ASAHIKLIN AK-225 (Made by Asahi Glass Co., Ltd.)

N-Pentane (Kanto Chemical Co., Ltd.) n-Heptane (Kanto Chemical Co., Ltd.) n-Decane (Kanto Chemical Co., Ltd.) n-Dodecane (Kanto Chemical Co., Ltd.)

Example 1 SH200 Oil Viscosity 0.65cS 97% by weight Asahi Klin AK-225 3% by weight

Example 2 SH200 oil Viscosity 0.65 cS 95 wt% Asahi Klin AK-225 5 wt%

Example 3 SH200 Oil Viscosity 0.65 cS 50% by weight Asahi Klin AK-225 50% by weight

Example 4 SH200 oil Viscosity 0.65 cS 20% by weight Asahi Klin AK-225 80% by weight

Example 5 SH200 oil Viscosity 0.65 cS 5% by weight Asahi Klin AK-225 95% by weight

Example 6 SH200 oil Viscosity 3.0 cS 50% by weight Asahi Klin AK-225 50% by weight

Example 7 SH200 oil viscosity 5.0 cS 50% by weight Asahi Kulin AK-225 50% by weight

Comparative Example 1 50% by weight of purified water Asahi Klin AK-225 50% by weight

Example 8 SH200 oil viscosity 0.65 cS 97% by weight n-pentane 3% by weight

Example 9 SH200 Oil Viscosity 0.65 cS 95 wt% n-Pentane 5 wt%

Example 10 SH200 oil viscosity 0.65 cS 50% by weight n-pentane 50% by weight

Example 11 SH200 oil viscosity 0.65 cS 20% by weight n-pentane 80% by weight

Example 12 SH200 Oil Viscosity 0.65 cS 5% by weight n-Pentane 95% by weight

Example 13 SH200 oil viscosity 0.65 cS 50% by weight n-heptane 50% by weight

Example 14 SH200 oil viscosity 0.65 cS 50% by weight n-dodecane 50% by weight

The following tests were carried out on the above compounds. 1. Detergency test JIS G 3141 was immersed in lubricating oil or grease was uniformly applied to prepare test pieces. This test piece was immersed in a detergent for 30 minutes, and the degreased state was visually observed. The lubricating oil and grease used are as follows. Lubricating oil ThreeBond 1804 (manufactured by ThreeBond Co., Ltd.) Grease 1 ThreeBond 1805 (manufactured by ThreeBond Co., Ltd.) Grease 2 ThreeBond 1855 (manufactured by ThreeBond Co., Ltd.)

2. Effect on rubber The rubber was immersed in a detergent for 30 minutes, dried for 5 minutes, weighed, and the mass change rate was calculated from the following formula.

Mass change rate = (B−A) / A × 100 A: mass of test piece before immersion B: mass of test piece after immersion

The rubber used is as follows. Styrene butadiene rubber (SBR) SBR-400 (made by Irumagawa Rubber) Chloroprene rubber (CR) NeO-180 (made by Irumagawa Rubber) Natural rubber (NR) B-1000 (made by Irumagawa Rubber)

3. Drying property test At 25 ° C., 0.1 g of a cleaning agent was appropriately applied on JIS G 3141 and the time until the cleaning agent was completely dried was examined. Those that dried within 30 minutes were accepted. The test results are shown below. In addition, the test result showed the pass as O and the fail as X.

[0046]

[Table 1]

[0047]

In summary, according to the present invention, it has good detergency, excellent drying property, low poison and low odor, does not easily invade rubber parts, and reduces the use amount of CFCs and saturated aliphatic hydrocarbons. Then, degreasing cleaning can be performed.

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Claims (5)

[Claims] 1. A degreasing detergent composition comprising dimethylpolysiloxane as an essential component, and any one or more of a fluorinated hydrocarbon and / or an aliphatic saturated hydrocarbon added thereto. 2. The viscosity of dimethylpolysiloxane is 0.06 to.
The degreasing detergent composition according to claim 1, which is 5 cS. 3. The compounding amount of dimethylpolysiloxane is 20 to.
The degreasing detergent composition according to claim 1, which comprises 95% by weight. 4. The fluorinated hydrocarbon is 1,1-dichloro-2,2,
The degreasing detergent composition according to claim 1, which comprises 3,3,3-pentafluoropropane and / or 1,3-dichloro-1,2,2,3,3-pentafluoropropane. 5. The degreasing detergent composition according to claim 1, wherein the saturated aliphatic hydrocarbon is a compound having 5 to 10 carbon atoms.