JP2878862B2 - Cleaning composition for precision parts or jigs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detergent composition, and more particularly, to oils and fats, machine oils, cutting oils, greases and the like present on the surface of precision parts or jigs and tools used in the assembly and processing steps thereof.
The present invention relates to a cleaning composition that is excellent in removing contaminants such as liquid crystal and rosin-based flux and is excellent in rinsing properties.

[0002]

2. Description of the Related Art Conventionally, for removing contaminants mainly composed of organic substances such as oils and fats present on surfaces of precision parts and jigs, hydrocarbon-based solvents such as kerosene, benzene and xylene; trichloroethylene, tetrachloroethylene, etc. Chlorinated solvents; CFC-based solvents such as trichlorotrifluoroethane; and aqueous cleaning agents in which a surfactant or a builder is mixed with sodium orthosilicate or caustic soda.
In particular, fluorocarbon-based solvents or chlorine-based solvents are used for components such as electronics, electricity, and machines, taking advantage of their high cleaning properties and flame retardancy.

[0003]

However, cleaning agents using chlorine-based and chlorofluorocarbon-based solvents are safe, toxic,
It has a major problem in environmental pollution. On the other hand, water-based detergents are preferable in that they have low toxicity, but are several times inferior in detergency.

In the case of cleaning agents used for precision parts and the like, if the cleaning agent remains on the surface of the object to be cleaned after cleaning, the cleaning parts may have an adverse effect on plastic parts and the like. ing.

Accordingly, an object of the present invention is to remove contaminants such as oils and fats, machine oil, cutting oil, grease, liquid crystal, and rosin-based flux present on the surface of precision parts or jigs and tools used in the assembling process thereof. An object of the present invention is to provide a detergent composition which is excellent in detergency and rinsing properties, has no fear of environmental pollution, and is highly safe.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have combined a specific compound having a specific viscosity with a nonionic surfactant having an average HLB within a specific range. It has been found that a detergent composition having a specific viscosity achieves the above object.

The present invention has been made based on the above-mentioned findings, and (A) is represented by the following Chemical Formula 2 (same as Chemical Formula 1).
5 to 95% by weight of a compound having a viscosity at 0.5 ° C of 0.5 to 10 cp and (B) 5 to 95% by weight of a nonionic surfactant having an average HLB of 4 to 15; ~ 20
The present invention provides a cleaning composition for jigs and tools used in precision parts or assembling processes thereof, which is cp.

[0008]

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Hereinafter, the cleaning composition of the present invention will be described in detail.

As the component (A) of the present invention, for example, the following compounds can be mentioned.

Compounds in which X in the above formula (2) is the following formula (3): dodecane and hexadecane; olefins such as octene, dodecene, tetradecene, tetrapropylene and tetraisobutylene; olefin polymers such as propylene And dimers of 1-decene and the like.

[0012]

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Compounds in which X in the above formula (2) is -COO- include methyl cocoate, isopropyl myristate, 2-ethylhexyl stearylate, methyl laurate, methyl oleate, isobutyl oleate and the like. Butyl acrylate and 2-ethylhexyl acrylate.

The compound in which X in the above formula (2) is --CO-- includes, for example, methylhexyl ketone, diisobutyl ketone, 2,6,8, trimethyl-4-nonanone, and the like. Examples of the compound in which X is -O- include diisoamyl ether and dihexyl ether.

Examples of the compound in which X in the above chemical formula 2 is the following chemical formula 4 include dimethyllaurylamine, dimethylmyristylamine, dilaurylmonomethylamine,
Trioctylamine and the like.

[0016]

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Of these compounds, particularly preferred are:
X in the above chemical formula 2 is an olefin having a hydrocarbon unsaturated bond and a branched paraffin, wherein X is the chemical formula 3 above. Also,
Compounds such as methyl laurate and methyl oleate in which X in the above formula (2) is -COO- are also particularly preferred.

The component (A) has a viscosity at 20 ° C. of 0.5
10 cp, preferably 0.5-8 cp, particularly preferably 0.5-5 cp. When the viscosity at 20 ° C. is less than 0.5 cp, the flammability of the detergent composition is high, and safety during washing becomes a problem. On the other hand, if it is more than 10 cp, the cleaning property is not sufficient for the contaminants in a narrow gap portion, which is not preferable.

The above-mentioned component (A) may be used alone or in combination of two or more kinds.
5% (% by weight, hereinafter the same), preferably 20 to 90%,
More preferably, it is 30 to 80%. If the amount is less than 5%, the washing property is insufficient, and if it exceeds 95%, the water rinsing property is inferior.

The component (A) is excellent in solubility in organic dirt substances, but is poor in solubility in water, so that poor rinsing is likely to occur when rinsing with water. Further, when the cleaning composition contains water, the water dissolving power is low,
For example, there may be a problem that product stability becomes poor such as occurrence of liquid separation.

The detergent composition of the present invention has an average HLB of 4 to 1 as a component (B) together with the compound of the component (A).
In this case, the problem of the component (A) is improved, and the desired detergent composition is obtained.

Examples of the nonionic surfactant (B) include polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenol ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene allyl phenol ethers, and polyoxyalkylene sorbitan fatty acid esters. , Polyoxyalkylenealkylamines, sorbitan fatty acid esters, polyoxyalkylenes and the like are preferably used, and among these, nonionic surfactants of HLB 4 to 15 exhibit particularly excellent effects. Here, polyoxyalkylene refers to a polymer of ethylene oxide, propylene oxide, or butylene oxide.

The nonionic surfactant (B) is used alone or in combination of two or more.
It is necessary to use those having an HLB of 4 to 15, and when two or more HLBs are used in combination, it is necessary to use them together so that their average HLB is 4 to 15. If the (average) HLB is less than 4, the water rinsing property is not sufficient, and the (average) HL
If B is more than 15, the compatibility with the component (A) is poor, and the storage stability of the product is poor.

The amount of the nonionic surfactant (B) is 5 to 95%, preferably 5 to 40%, more preferably 5 to 30% in the detergent composition. If the amount is less than 5%, the rinsing property is poor, and the washed object may float in the rinsing tank. Also, 95
%, The detergency deteriorates.

The detergent composition of the present invention containing the above components (A) and (B) has a viscosity at 40 ° C. of 0.5
-20 cp, preferably 0.5-10 cp. When the viscosity is less than 0.5 cp, safety such as flammability is poor, and when it is more than 20 cp, there is a tendency that cleaning properties are poor for contaminants in narrow gaps.

The cleaning composition of the present invention can contain water as appropriate from the viewpoint of safety and workability. The blending amount of water is preferably 5 to 50% in the detergent composition.

The detergent composition of the present invention may further contain, if necessary, other surfactants as long as the effect is not impaired.
An antifoaming agent such as silicone, an amine or phenolic antioxidant, a rust inhibitor, an alkanolamine, or the like may be added.

The detergent composition of the present invention can be produced by mixing the above-mentioned components (A) and (B) and the like by a conventional method.

The method of cleaning using the cleaning composition of the present invention is not particularly limited. For example, ultrasonic cleaning or immersion cleaning using the cleaning composition of the present invention, and finally rinsing with a solvent or hot water. And the like are continuously performed as an efficient cleaning method. Further, various cleaning methods such as a vibration method and a spray method may be used.

[0030]

The cleaning composition of the present invention is used for cleaning precision parts or jigs and tools used in the assembling process of the precision parts. At this time, the components (A) and (B) act to clean the surface of the object to be cleaned. To remove contaminants present in After the cleaning, the cleaning composition of the present invention remaining on the surface of the object to be cleaned is washed away by rinsing the object to be cleaned with water or the like.

[0031]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Examples 1 to 8 and Comparative Examples 1 to 9

Each of the cleaning compositions having the compositions shown in Tables 1 and 2 below was prepared, and for each of the cleaning compositions, the removal property (detergency) of dirt substances, the rinsing property (rinsing property), and the product stability. Was evaluated as follows. The results are shown in Tables 1 and 2 below.

(Evaluation Method of Soil Removal and Rinsing Properties)

A rosin-based flux-treated printed circuit board, a copper plate coated with a naphthenic mineral oil, or a glass substrate coated with a liquid crystal containing a nematic liquid crystal as a main component were immersed in each of the detergent compositions, 10 sheets each. 3 at 40 ° C
Washing was performed while applying ultrasonic waves for one minute, and the removability of contaminants at that time was evaluated. Next, the above-mentioned printed circuit board, copper plate or glass substrate washed with the detergent composition was subjected to a rinsing treatment with ion-exchanged water at 20 ° C., and the rinsing property was visually evaluated. The evaluation criteria for the removability and rinsing properties of the contaminants are as follows.

Evaluation criteria for removal of dirt substances A: Dirt substances (flux, naphthenic mineral oil or liquid crystal)
Very good with no residue. ；: Good with almost no residual dirt. Δ: Slight residue of dirt substance was slight and slightly poor. X: Soil substance remains and is bad.

Evaluation criteria of rinsing property A: very good. ；: Good. Δ: slightly inferior. ×: Bad.

(Method of evaluating product stability)

The appearance of each detergent composition was visually observed at room temperature according to the following evaluation criteria.

Evaluation criteria for product stability ○: Uniform and transparent. Δ: slight separation or turbidity. X: completely separated.

[0041]

[Table 1]

[0042]

[Table 2]

In Tables 1 and 2, (POE) represents polyoxyethylene, and (POP) represents polyoxypropylene.

The cleaning composition of the present invention has excellent detergency and rinsing properties as a cleaning composition for jigs and tools used in precision parts or assembling processes thereof, and has a high degree of chlorofluorocarbon and the like. Since it is not used, it does not pollute the environment and has high safety.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ identification symbol FI // H05K 3/26 H05K 3/26 (58) Investigated field (Int.Cl. ⁶ , DB name) C11D 3/18-3 / 30 C11D 7/22-7/32 B23K 1/00 C11D 1/66-1/80 WPI / L (QUESTEL)

Claims (2)

(57) [Claims] 1. A nonionic surfactant represented by the following formula (1): 5-95% by weight of a compound having a viscosity at 20 ° C. of 0.5 to 10 cp and (B) an average HLB of 4 to 15. 5
~ 95% by weight, viscosity at 40 ° C 0.5 ~ 20c
A cleaning composition for jigs and tools used in precision parts or assembling processes thereof, which is p. Embedded image 2. The cleaning composition according to claim 1, comprising 5 to 50% by weight of water.