JPH0468097A - Detergent composition - Google Patents

Abstract

PURPOSE:To improve the adaptability to waste water treatment by incorporating a nonionic surfactant in a detergent composition so as to specify the cloud point of the composition. CONSTITUTION:A detergent composition is obtained by dissolving in water 2 - 90wt.% nonionic surfactant having a 4 - 22 C hydrocarbon residue and, if necessary, other surfactant, chelating agent, antiseptic, rust preventive, antifoaming agent, etc. The detergent composition is such that the cloud point of its 5wt.% aqueous solution is 5 - 100 deg.C and when the aqueous solution is maintained for 30 minutes or more at a temperature above the cloud point, 30wt.% or more of organic matter contained is separated from the aqueous system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cleaning composition, and more particularly, to a cleaning composition that cleanses oils, fats, and machine oils that exist on the solid surfaces of precision parts or jigs and tools used in the assembly process thereof. The present invention relates to a cleaning composition having excellent wastewater treatment properties and used for removing stains such as cutting oil, grease, liquid crystal, and rosin flux.

[Problems to be solved by conventional techniques and inventions] Conventionally,
Hydrocarbon solvents such as kerosene, benzene, xylene, etc.; ) Chlorinated solvents such as IJ chloroethylene, tetrachloroethylene; Freon-based solvents such as trichlorotrifluoroethane: Water-based cleaning agents containing sodium orthosilicate or caustic soda combined with surfactants and builders are used. In particular, fluorocarbon solvents or chlorinated solvents are used for electronic, electrical, mechanical, and other parts due to their high cleaning properties and flame retardant properties.

However, cleaning agents using chlorine-based and fluorocarbon-based solvents have major problems in terms of safety, toxicity, environmental pollution, and the like. In addition, hydrocarbon solvents, especially benzene and xylene, are highly toxic compounds and are designated as hazardous substances under the Industrial Safety and Health Act. It is not preferable to use it as an agent.

On the other hand, water-based cleaning agents are less dangerous and toxic than solvent-based cleaning agents, and are combined with appropriately selected cleaning ingredients such as nonionic surfactants that have excellent cleaning properties for oily stains and other substances. By doing so, it is possible to have excellent cleaning power.

However, aqueous cleaning agents containing various surfactants generally have good water solubility, and therefore have the disadvantage of poor wastewater treatment properties. Conventionally, treatment methods such as coagulation sedimentation, pressurized flotation, activated sludge treatment, and activated carbon treatment have been used singly or in combination to treat the cleaning solution itself or the rinse solution that is obtained by rinsing the cleaning solution attached to the material to be cleaned with water. However, this requires large processing costs and processing equipment.

Therefore, the object of the present invention is to provide easily drainable precision parts or jigs and tools used in the assembly process thereof, which improve the drawbacks of conventional water-based cleaning agents or cleaning agents of the type that require rinsing with water after cleaning. It is an object of the present invention to provide a cleaning composition used to remove dirt components such as oils and fats, machine oil, cutting oil, fleece, liquid crystal, and rosin-based flux existing on the surfaces of solid objects.

[Means to solve the problem]

Under these circumstances, the present inventors conducted intensive research to solve the above problems, and as a result, they added a nonionic surfactant to the composition and lowered the cloud point of a 5% by weight aqueous solution to 5 to 100°C.
The inventors have discovered that a cleaning composition that satisfies the above conditions can be obtained by doing so, and have completed the present invention.

That is, the present invention provides an easily drainable cleaning agent for precision parts or tools that contains a nonionic surfactant and has a cloud point of 5% by weight aqueous solution of the composition of 5 to 100°C. A composition is provided.

In addition, the cloud point as used in the present invention refers to an aqueous solution diluted to 5% by weight with ion-exchanged water, placed in a test tube for 10 to 30 minutes, and heated to
This is the temperature at which liquid begins to cloud when the temperature is raised at a rate of 1°C/minute after cooling to a certain temperature.

As the nonionic surfactant in the present invention, those classified as described in "Surfactant Handbook" published by Sangyo Tosho Co., Ltd., pages 37 to 45 are used, such as alkyl ether type, alkyl allyl ether type, etc. and ether type surfactants such as alkyl thioether type, ester type surfactants such as alkyl ester type and sorbitan alkyl ester type, condensation type surfactants with amines such as polyoxyalkylene alkyl amines, polyoxyalkylene alkyl esters, etc. Condensation type surfactant with amide such as amide,
Examples include pluronic or tetronic surfactants made by random or block condensation of polyoxyethylene and polyoxypropylene, and polyethyleneimine surfactants.

Among these, nonionic surfactants having a hydrocarbon residue having 4 to 22 carbon atoms are particularly preferred. Such nonionic surfactants have a high affinity for oil-based stains and improve cleaning power, and cleaning compositions containing these nonionic surfactants exhibit a clear clouding point when heated. Effluent treatment performance is further improved.

These nonionic surfactants are preferably blended in the detergent composition of the present invention in an amount of 2 to 90% by weight. If the blending amount is less than 2% by weight, the cleaning power against oily stains etc. will decrease,
Moreover, even if it exceeds 90% by weight, the detergency is difficult to increase.

The above-mentioned nonionic surfactants lose water solubility when the temperature of the composition rises above the clouding point and are excluded from water. As a result, oily dirt that has been emulsified or solubilized in the cleaning solution is no longer retained in the water and precipitates out, floating or sinking on the water depending on its specific gravity.
These stains can be easily removed by skimming off the oily components.

In this way, cleaning compositions that have a cloud point within a specific temperature range can remove oily dirt and nonionic surfactants that are emulsified or solubilized in water simply by raising the temperature above the cloud point. It can remove itself from the water, bringing great benefits such as simplifying wastewater treatment equipment, shortening wastewater treatment time, and reducing wastewater treatment costs.

The cloud point of a 5% by weight aqueous solution of the cleaning composition of the present invention is 5 to 1.
It is necessary that the temperature is in the range of 00℃, especially 20 to 9
Preferably, the temperature is in the range of 0°C. If the red-black color is less than 5°C, the rinsing performance will be significantly reduced when rinsing with water after washing. This is because rinsing with water is usually performed at room temperature (5°C) or higher to ensure rinsing efficiency, so if the temperature of the rinsing water is lower than the temperature of the rinsing water, the cleaning liquid adhering to the surface to be cleaned will be dissolved. This is because it becomes difficult to remove. Additionally, if the red-black temperature exceeds 100°C, it will be necessary to use means such as pressurization to raise the temperature above the red-black level during drainage treatment of the cleaning solution, which requires special equipment and costs. disadvantageous in terms of

Further, in the cleaning composition of the present invention, when a 5% by weight aqueous solution of the composition is kept at a temperature of red and black or higher for 30 minutes or more, the organic content in the cleaning composition is 30% by weight or more, more preferably 50% by weight. It is preferable that the above is separated from the aqueous system. The degree of separation of this organic matter can be easily determined by comparing the COD (chemical oxygen demand) value of water before and after red and black heating treatment, and the greater the degree of separation of organic matter, the more nonionic interfaces. This indicates that the activator has lost its effectiveness, improving wastewater treatment properties.

The cleaning composition of the present invention may contain other surfactants, organic or inorganic compounds with chelating power, preservatives, and preservatives that are commonly used in cleaning agents, as long as they do not impair the effects of the present invention. Rust agents, antifoaming agents, antioxidants, hydrocarbon solvents,
Amine additives, alcohols, water, etc. can be added.

The cleaning agent of the present invention has a particularly excellent effect when cleaning precision parts and jigs and tools used in the assembly process thereof. Refers to resin processed parts, optical parts, etc. Here, electronic components include, for example, contact members such as printed wiring boards, IC lead frames, resistors, capacitor relays, etc. used in computers and their peripheral equipment, home appliances, communication equipment, office automation equipment, and other electronic application equipment. Hoop materials used; Liquid crystal displays used in OA type equipment, watches, computer equipment, toys, home appliances, etc.; Magnetic recording parts used in video/audio recording/playback parts and related parts; silicon and ceramic wafers, etc. semiconductor materials; electrostrictive parts such as crystal resonators; photoelectric conversion parts used in CDs, PDs, copying equipment, optical recording equipment, etc. Electrical parts include motor parts such as brushes, rotors, stators, housings, etc.
Ticket issuing parts used in vending machines and various equipment; coin inspection parts used in vending machines, cash dispensers, etc. Precision mechanical parts include, for example, bearings used in precision drive equipment, video recorders, etc., and machining parts such as carbide tips. Resin processed parts refer to precision resin processed parts used for cameras, automobiles, etc., for example. Further, optical parts include lenses used in cameras, glasses, optical instruments, etc., and other parts include glasses frames, watch cases, watch straps, etc.

In the present invention, the jigs and tools used in the assembly processing process are used to manufacture precision parts such as those shown in the various parts examples above.
Refers to jigs and tools used in various processes such as molding, processing, assembly, and finishing, as well as various equipment and parts that handle these precision parts.

The cleaning composition of the present invention exhibits suitable performance particularly when cleaning liquid crystals adhered to printed wiring boards and glass substrates with residual flux among the above-mentioned items. Jigs and tools are not limited to these examples, but during the assembly process, they are contaminated with substances that interfere with subsequent processes such as various processing oils and fluxes, or various oil-based contaminants that degrade the characteristics of the product. The cleaning composition of the present invention can be applied to precision parts and jigs and tools that have a solid surface of a certain shape.

When these contaminants are mainly organic oil stains such as fats and oils, machine oil, cutting oil, grease, liquid crystal, and rosin flux, the characteristics of the cleaning composition of the present invention are particularly exhibited. Furthermore, it is also effective for dirt containing metal powder, inorganic powder, etc.

The cleaning composition of the present invention can be used in various cleaning and rinsing methods such as a dipping method, an ultrasonic cleaning method, a shaking method, a spray method, and a water displacement drying method, and can obtain favorable results.

When the cleaning agent of the present invention is used, for example, in the process of cleaning a printed wiring board to which flux has adhered, ultrasonic cleaning may be performed using, for example, an ultrasonic cleaning tank containing the cleaning agent composition of the present invention.

After cleaning, the cleaning composition of the present invention can be easily removed by rinsing with water or the like. In addition, dirt or nonionic surfactants in the water can be easily separated by simply heating the rinsing wastewater to a temperature above red, making wastewater treatment very easy.

〔Example〕

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

Examples 1 to 15 and Comparative Examples 1 to 5 Cleaning compositions having the compositions shown in Table 1 were prepared, and each
The red and black color when made into a wt % aqueous solution was measured. The results are shown in Table 1.

In addition, the cleaning solutions of Examples 1 to 5, Comparative Examples 1 and 4 were coated with rosin-based flux, and the cleaning solutions of Examples 6 to 10 and Comparative Example 2 were coated with naphthenic mineral oil. The copper plates were immersed in the cleaning solutions of Examples 11-15, Comparative Example 3, and Comparative Example 5, in which ten glass substrates each coated with a liquid crystal containing nematic liquid crystal as the main component were immersed, and ultrasonic waves were applied at 40°C for 3 minutes. I washed it while doing so. Next, rinsing treatment was performed with ion-exchanged water at 20° C., and the quality of rinsing performance was evaluated. The results are shown in Table 1.

Furthermore, the above-mentioned rinsing process was repeated until 5% by weight of the cleaning liquid was mixed in, and for the 100 rinsing liquids obtained,
The COO value of the aqueous layer after being maintained at a temperature above red/black in the range of 5 to 100°C was compared with the COO value of the aqueous layer at a temperature below red/black to evaluate the separability of organic substances. The results are shown in Table 1.

(Evaluation criteria for rinsing properties) ◎ Very good rinsing properties ○ Good rinsing properties △ Slight adhesion of cleaning liquid that cannot be rinsed × A large amount of cleaning liquid that cannot be rinsed adhered (Evaluation criteria for separation of organic substances) ◎ Very good separation of organic substances (separation rate of 60% by weight or more) ) ○ Good separation of organic substances (separation degree of 30% by weight or more) △ Insufficient separation of organic substances Because it has excellent wastewater treatment properties, it can be advantageously used for cleaning precision parts or jigs and tools used in the assembly process thereof.

that's all

Claims (2)

[Claims] 1. Contains a nonionic surfactant, 5% by weight of the composition
An easily drainable cleaning composition for precision parts or jigs and tools, characterized in that an aqueous solution has a cloud point of 5 to 100°C. 2. The cleaning composition according to claim 1, characterized in that when a 5% by weight aqueous solution of the composition is kept at a temperature above the clouding point for 30 minutes or more, 30% by weight or more of the organic matter in the composition is separated from the aqueous system. .