JPH059764A - Cleaner composition for equipment appicable to in-refrigeration cycle - Google Patents

Abstract

PURPOSE:To provide a water soluble composition for equipment applicable in a refrigeration cycle substituted for a flon (freon) system cleaner. CONSTITUTION:This cleaner composition for equipments applicable an in- refrigeration cycle consists of a builder containing respectively at least one kind of a silicate, a phosphate and a chelating agent respectively and at least one kind of surfactant selected from a group of an anionic surfactant and a nonionic surfactant used at (2:1)-(90:1)wt. ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent effective for cleaning various metal parts and members incorporated in equipment applied in a refrigeration cycle.

[0002]

2. Description of the Related Art Conventionally, various metal parts such as a cylinder and a cylinder frame made of a sintered alloy, a rotor component made of aluminum and a cylinder made of copper, which are incorporated in a refrigeration cycle application device, particularly a compressor and the like. For cleaning various contaminants such as metal working oil, press oil, light oil, cutting metal powder, carbon residue, dust, etc. that adhere to the head, etc. Freon 1 is used because it does not deteriorate gas and refrigerating machine oil and is easy to dry.
Freon-based cleaning agents such as 13 are used.

However, since it has been found that the use of this type of CFC-based cleaning agent causes the destruction of the ozone layer surrounding the earth, it has been greatly regulated, and in the future it will be totally prohibited. , The development of alternatives is required.

[0004] Organic solvents such as methyl alcohol and isopropyl alcohol are highly flammable and not only pose a safety problem but also unfavorable in terms of work hygiene, so it is practical to use the solvent as a cleaning agent on a large scale. It is impossible.

Therefore, a water-soluble detergent composition is required, but in the case of a porous metal part such as a sintered alloy and a part having a complicated internal structure or a gap,
After the cleaning process, the water-soluble cleaning agent cannot be sufficiently removed from the parts to be processed, etc., and the remaining cleaning agent promotes deterioration of the refrigerating machine oil and decomposition of the refrigerant gas.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a water-soluble detergent composition which can substitute for a CFC-based detergent and does not cause corrosion deterioration of a base metal, and is also used for cooling and refrigerating equipment. It is intended to provide a detergent composition which does not promote deterioration of refrigerating machine oil or decomposition of refrigerant gas due to residual when used for cleaning various metal parts or members.

[0007]

That is, the present invention is selected from the group consisting of a builder containing at least one silicate, a phosphate and a chelating agent and an anionic surfactant and a nonionic surfactant. The present invention relates to a cleaning composition for a device for application in a refrigeration cycle, which contains at least one kind of a surfactant in a weight ratio of 2: 1 to 99: 1.

Examples of silicates include metasilicates, orthosilicates, disilicates and tetrasilicates. Examples of salts include alkali metal salts such as sodium salts and potassium salts, calcium salts and magnesium salts. Examples thereof include alkaline earth metal salts and the like.

Examples of the phosphate include phosphate, hydrogen phosphate, polyphosphate and metaphosphate,
Examples of the salt include alkali metal salts such as sodium salt and potassium salt, and alkaline earth metal salts such as calcium and magnesium.

Examples of the chelating agent used in the present invention include nitrilotriacetate, ethylenediaminetetraacetate, diethylenetriaminepentaacetate and hydroxyethylethylenediaminetriacetate.
Examples of the salt include alkali metal salts such as sodium salt and potassium salt, ammonium salt and amine salt.

In the detergent composition according to the present invention, at least one of the above-mentioned silicate, phosphate and chelating agent is used as a builder. The compounding ratio of these three components is not particularly limited.

Examples of suitable anionic surfactants for use in the present invention include sodium higher alcohol sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate and ammonium lauryl sulfate.

Suitable nonionic surfactants used in the present invention include polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene copolymers, polyoxyethylene alkylaryl ethers, sorbitan fatty acid esters and polyoxyethylene fatty acid esters. Are exemplified, but polyoxyethylene alkyl ether is particularly preferable.

The compounding ratio of the builder and these surfactants is the former: the latter = 2: 1 to 99: 1. If the compounding amount of the builder is more than this range, the detergency becomes poor and If it is less than this range, the deterioration of the refrigerating machine oil and the decomposition of the refrigerant gas are promoted.

The detergent composition according to the present invention usually contains about 1
Since it is used as an aqueous solution of at least 1% by weight, preferably an aqueous solution of 3 to 10% by weight, when a sparingly water-soluble surfactant is used, the following formula (I): R.COOM (I) (formula In the formula, R has 6 to 6 carbon atoms which may have a branched chain.
24 represents an aliphatic hydrocarbon residue or an aromatic hydrocarbon residue which may have a branched chain and may have an aliphatic hydrocarbon residue having 1 to 18 carbon atoms, and M represents a hydrogen atom. , An alkali metal atom, an alkaline earth metal atom, a lower amine residue, an ammonium group, or an alkanolamine residue having 2 to 10 carbon atoms). The compounding ratio (weight ratio) of the total amount of the surfactant, the solubilizing agent and the builder is preferably 1: 2 to 1:99.

Examples of such solubilizers include hexanoic acid, octanoic acid, decanoic acid, dodecanoic acid, octadecanoic acid, 2,3-dimethyloctanoic acid, 2-methylundecanoic acid, 2-methylheptadecanoic acid and benzoic acid. , P-t-butylbenzoic acid and salts thereof, for example, alkali metal salts (sodium salt, potassium salt, etc.), alkaline earth metal salts
(Calcium salt, magnesium salt, etc.), lower amine salt (methylamine salt, ethylamine salt, propylamine salt, butylamine salt, etc.), alkanolamine salt (monoethanolamine salt, diethanolamine salt, triethanolamine salt), ammonium salt, etc. , But pt
-Sodium butyl benzoate is particularly preferred.

If desired, the detergent composition according to the present invention may contain a builder other than those mentioned above, such as borate and carbonate.
Alternatively, metal corrosion inhibitors such as alkylamines (methylamine, propylamine, butylamine, etc.), alkanolamines (monoethanolamine, diethanolamine, triethanolamine, etc.), 3-aminotriazole, benzotriazole, tolyltriazole, etc. are appropriately used. You may mix.

The detergent composition according to the present invention is useful for cleaning various metal parts and members, and in particular, various metal parts incorporated in the equipment for cooling and refrigerating equipment such as compressors. , Various contaminants such as sintered alloy cylinders and cylinder frames, aluminum rotor components and copper cylinder heads, such as metal working oil, press oil, light oil, cutting metal powder, carbon residue and dust It is effective in cleaning processing such as. In this case, as a cleaning method, a spray cleaning method and an ultrasonic cleaning method are generally used.

[0019]

EXAMPLES The present invention will be described below with reference to examples.Examples 1-5 and Comparative Examples 1-4   Prepared according to the formulation shown in Table 1 (compounding amount:% by weight)
Cleaning agents 1-5 or 1'-4 'diluted in 3% by weight aqueous solution
The contaminants (cutting oil, cutting chips,
Sound from the compressor cylinder with dust and dirt)
It was washed by wave (washing temperature: 55 ° C., washing time: 1.5 minutes).
The washed cylinder was washed with running water for 30 seconds.
After that, the residual oily matter was extracted with 1 liter of carbon tetrachloride,
The oil content was measured using an oil content meter. Display measurement results
Shown in 1. Also, whether carbon and dust remain
Were visually examined, and the results are shown in Table 1.

Further, a sample obtained by evaporating the water content of the cleaning agents 1 to 5 or 1'to 3'or the cleaning agent 4'was mixed with 1% by weight of a mineral oil type refrigerating machine oil, and the mixture was mixed with the refrigerant CFC-12 and 1. : 1
The test solutions 1 to 5 or 1'to 3'or 4'where Al, Cu and Fe are added as a catalyst to the mixture are sealed in a glass tube and the glass tube is heated to 175 ° C for 1 hour.
Heated for 4 days. The deterioration degrees of the refrigerating machine oil and the refrigerant gas in the glass tube were examined as follows, and the results are shown in Table 2.

Deterioration degree of refrigerating machine oil: Since the refrigerating machine oil has a characteristic of discoloring red with deterioration, the degree of the discoloring is AS
The deterioration degree of the test liquid was evaluated by comparing with TM color number [color sample in which the degree of coloring of oil was divided into 0 (no coloring) to 8 (black) in 17 steps). That is, the color of fresh refrigerator oil (AST
M color number: 0) when strongly colored by 2 or more was evaluated as oxidative deterioration. Degradation degree of refrigerant gas : The gas in the glass tube was analyzed by gas chromatography, and the concentrations of Freon-12 and Freon-22 produced by its decomposition were measured.
When the content concentration of 12 was 99.5% or less, it was evaluated as oxidative deterioration.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

The cleaning composition according to the present invention is a water-soluble cleaning agent that can substitute for CFC-based cleaning agents, and does not cause corrosion deterioration of the base metal, and is also used for equipment applied in the refrigeration cycle. Even when it is used for cleaning various metal parts, members, etc., the residue does not accelerate deterioration of refrigerating machine oil or decomposition of refrigerant gas.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location C11D 3:30) (72) Inventor Hiroshi Wada 1-1 Oike-cho, Kosai-cho, Koga-gun, Shiga Prefecture Stock Association Company Neos (72) Inventor Ryoji Harai 3-25-9 Meieki, Nakamura-ku, Aichi Prefecture Neos Nagoya Sales Office (72) Inventor Takao Kawamoto 3-18-1 Oka Shizuoka-shi Shizuoka Mitsubishi Electric Engineering Co., Ltd. Shizuoka Works In-house Development Group Technical Group (72) Inventor Mitsuru Ikegaya 3-181-1, Oga Shizuoka City, Shizuoka Prefecture Mitsubishi Electric Co., Ltd. Shizuoka Manufacturing Development Group Technical Group (72) Hideki Mori 3-18-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Plant Internal Development Department Technical Group (72) Inventor Iwao Yokoyama 3--18, Oka, Shizuoka-shi, Shizuoka No. 1 Mitsubishi Electric Corporation Shizuoka Works in the Development Department Technology Group

Claims (2)

[Claims] 1. A builder containing at least one silicate, a phosphate and a chelating agent, and at least one surfactant selected from the group consisting of an anionic surfactant and a nonionic surfactant. A cleaning composition for equipment applied in a refrigeration cycle, which is contained in a weight ratio of 2: 1 to 99: 1. 2. A compound represented by the general formula (I): R.COOM (wherein R may have a branched chain having 6 to 6 carbon atoms).
24 represents an aliphatic hydrocarbon residue or an aromatic hydrocarbon residue which may have a branched chain and may have an aliphatic hydrocarbon residue having 1 to 18 carbon atoms, and M represents a hydrogen atom. , An alkali metal atom, an alkaline earth metal atom, a lower amine residue, an ammonium group or an alkanolamine residue having 2 to 10 carbon atoms), and a surfactant and the solubilizing agent. The detergent composition according to claim 1, wherein the total ratio of the agents and the compounding ratio (weight ratio) of the builders are 1: 2 to 1:99.