JP2893497B2 - 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 cleaning composition for precision parts or jigs and tools. More particularly, the present invention is excellent in removing and rinsing dirt substances present on surfaces of precision parts or jigs and tools. Moreover, the present invention relates to a highly safe cleaning composition.

[0002]

2. Description of the Related Art
Trichloroethylene, tetrachloroethylene, etc. are used to remove contaminants mainly composed of organic substances such as oils and fats, machine oil, cutting oil, grease, liquid crystal, and rosin flux existing on the surface of precision parts or jigs and tools used in the assembly processing process. Chlorinated solvents; CFC-based solvents such as trichlorotrifluoroethane; and alkaline aqueous cleaning agents in which a surfactant or builder is mixed with sodium orthosilicate or caustic soda. However, chlorine-based and chlorofluorocarbon-based solvents have major problems in safety, toxicity, environmental pollution, etc., and alkaline aqueous cleaning agents remain on the surface of the cleaning object when used for precision parts. This has the problem of adversely affecting plastic parts and the like.

Recently, glycol ethers (JP-A-3-97792 and JP-A-3-227400) and non-terpene hydrocarbons (JP-A-3-243699) have been proposed as such detergents. ing. However, glycol ethers are inferior to cleaning agents for grease stains,
Non-terpene hydrocarbons have drawbacks in that they have a flash point, require the installation of explosion-proof equipment, and are limited in quantity handling.

Accordingly, there has been a demand for a cleaning composition which is excellent in the removal and rinsing properties of dirt substances present on the surfaces of precision parts or jigs and tools, and which has no risk of environmental pollution and is highly safe.

[0005]

Under these circumstances, the present inventors have conducted intensive studies and have found that specific hydrocarbons,
When a glycol ether compound, a nonionic surfactant and water are used in combination, the detergent composition is excellent in detergency and rinsing properties, and has no risk of environmental pollution, and is highly safe for precision parts or jigs and tools. It was found that a product was obtained, and the present invention was completed.

That is, the present invention provides the following components (a) to
(D): (a) 5 to 85% by weight of a hydrocarbon having 10 to 18 carbon atoms; (b) general formula (1)

[0007]

Embedded image

(Wherein, R ¹ represents an alkyl group or alkenyl group having 1 to 4 carbon atoms, R ² represents a hydrogen atom or an alkyl group or alkenyl group having 1 to 4 carbon atoms, and n represents 2 to 4 carbon atoms. indicates the number of, m represents a number of 1 to 4, m pieces of C _n H _2n O glycol ether compounds 1 to 80 wt%, represented by the but it may also be different from each); (c) mean HLB3 (D) 5 to 30% by weight of water; and a cleaning composition for precision parts or jigs and tools. It is.

The hydrocarbon of component (a) used in the present invention may be any of those having 10 to 18 carbon atoms, such as decane, dodecane, tetradecane, hexadecane, octadecane, decene, dodecene, tetradecene, and hexadecene. And octadecene, such as linear or branched saturated or unsaturated hydrocarbons; alkylbenzenes such as nonylbenzene and dodecylbenzene; naphthalene compounds such as methylnaphthalene and dimethylnaphthalene; cyclo-based compounds such as cyclodecane and cyclododecene. Of these, straight or branched chain saturated or unsaturated hydrocarbons having 12 to 18 carbon atoms are preferable, and particularly, detergency,
Considering handling and the like, olefinic hydrocarbons are preferred. These hydrocarbons constitute 5 to 85% by weight of the total composition (hereinafter simply referred to as%), preferably 10 to 80% by weight.
%, Particularly preferably 20 to 70%. If it is less than 5%, the cleaning property is poor, and if it exceeds 85%, the rinsing property is poor.

The glycol ether compound of the component (b) is represented by the above general formula (1), for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, diethylene glycol monomethyl ether, diethylene glycol Monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol methyl propyl ether; tri or tetraethylene glycol ethers corresponding thereto; di, tri or tetrapropylene glycol ethers corresponding thereto And the like.

These glycol ether compounds are
For example, an alkylene oxide having 2 to 4 carbon atoms (ethylene oxide, propylene oxide, butylene oxide, etc.) is added to a C1 to C4 alcohol in the presence of a catalyst such as caustic soda while heating, and the mixture is reacted by heating. can get. Further, when the terminal hydroxyl group of these alkylene oxide adducts is alkylated using an alkyl chloride or the like, a dialkyl ether can be obtained. When alkylene oxide is added, 2
Random addition polymerization in which at least one kind of alkylene oxide is mixed and reacted or block addition polymerization in which alkylene oxide is sequentially added may be performed. Among these glycol ether compounds, dialkyl ethers having alkylated terminals are more preferable than monoethers having hydroxyl groups at the terminals.

The glycol ether compound of the component (b) is blended in an amount of 1 to 80%, preferably 5 to 60%, particularly preferably 10 to 40% in the whole composition. If it is less than 1%, the rinsing properties are poor, and if it exceeds 80%, the cleaning properties are poor.

The nonionic surfactant of component (c) has an average HLB of 3 to 18, and is used for improving the rinsing property with water and the product stability. Such nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenol ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene allyl phenol ethers,
Polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkylamine, sorbitan fatty acid ester, polyoxyalkylene and the like are preferably used,
Among these, polyoxyalkylene oleyl ethers having an average HLB of 4 to 18 exhibit particularly excellent effects. Here, polyoxyalkylene refers to a polymer such as ethylene oxide, propylene oxide, or butylene oxide.

These nonionic surfactants are incorporated in the entire composition in an amount of 0.5 to 35%, preferably 3 to 30%. If it is less than 0.5%, no compounding effect is observed, and if it exceeds 35%, the viscosity of the composition is undesirably high.

The water of the component (d) accounts for 5 to 30%, preferably 7 to 20% in the total composition in view of safety and detergency.
%.

The detergent composition of the present invention may further contain, if necessary, a surfactant other than those described above, an aminocarboxylic acid salt such as hydroxyethylaminoacetic acid or ethylenediaminotetraacetic acid as long as the effect is not impaired. Compounds having chelating power, esters such as coconut fatty acid methyl and benzyl acetate, amine-based and phenol-based antioxidants, antifoaming agents such as silicon, and rust preventives can be appropriately compounded.

[0017] The cleaning composition of the present invention comprises the above (a) to
It can be produced by mixing the component (c) and optional components in a conventional manner. Further, in order to clean precision parts or jigs and tools using the cleaning composition of the present invention thus obtained, for example, ultrasonic cleaning or immersion cleaning using the cleaning composition of the present invention, And a method of continuously rinsing with a solvent or hot water. In addition, cleaning can be performed by various cleaning methods such as a vibration method and a spray method.

[0018]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited thereto.

Example 1 Detergent compositions having the compositions shown in Tables 2 and 3 were produced by a conventional method, and the removability (cleaning power) of dirt substances and the rinsing property (rinsing property) of each composition were determined as follows. The method was evaluated. In addition, the flash point was measured. Table 2 and Table 3 show the results.
Shown in (Evaluation method) A rosin-based flux-treated printed 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 was immersed in 10 pieces of each of the detergent compositions. 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 rinsed with ion-exchanged water at 40 ° C., and the rinsability was visually evaluated. The evaluation criteria for the removability and rinsing properties of the contaminants are as follows. The flash point is JIS K-
It was measured according to 2265.

[0020]

[Table 1] Removal of dirt substances ◎; 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. Rinsing ◎: very good. ；: Good. Δ: slightly inferior. ×: Bad.

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

The cleaning composition for precision parts or jigs and tools of the present invention is excellent in removing and rinsing dirt substances such as oils and fats, machine oil, cutting oil, grease, liquid crystal and rosin flux. There is no risk of environmental pollution and it is highly safe. In addition, by combining the components (a) to (c) with the water of the component (d), the flash point disappears, so that there is no need to install explosion-proof equipment, cost reduction is achieved, and there is no limit on the quantity in handling. There is also an advantage.

Continuation of the front page (56) References JP-A-4-68096 (JP, A) JP-A-3-146597 (JP, A) JP-A-3-9999 (JP, A) JP-A-3-97792 (JP) JP-A-4-122800 (JP, A) JP-A-4-57899 (JP, A)

Claims (1)

(57) [Claims] 1. The following components (a) to (d): (a) 5 to 85% by weight of a hydrocarbon having 10 to 18 carbon atoms; (b) a general formula (1) (In the formula, R ¹ represents an alkyl group or alkenyl group having 1 to 4 carbon atoms, R ² represents a hydrogen atom or an alkyl group or alkenyl group having 1 to 4 carbon atoms, and n represents a number of 2 to 4 indicates, m is a number of 1 to 4, m pieces of C _n H _2n O glycol ether is represented by each but it may also be different) compounds 1 to 80 wt%; (c) average HLB3~18 (D) 5 to 30% by weight of water; a cleaning composition for precision parts or jigs and tools.