JPH0768540B2 - Cleaning composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cleaning composition for electronic parts, and more particularly to a cleaning composition used for removing solder flux and flux residues from a printed circuit board.

[Conventional technology]

Generally, a printed circuit board used in electronic equipment is manufactured by forming a circuit on a laminated plate of glass, epoxy resin, etc., and soldering an electronic component such as an IC chip to this circuit. In order to perform the soldering completely and quickly, the flux treatment is performed before the soldering. However, since the flux and the flux residue deteriorate the electrical characteristics of the circuit, they are removed by using a cleaning agent after soldering.

As this cleaning agent, many water-based or solvent-based cleaning agents have been proposed so far, but in reality, there is no flash point,
A chlorine-based or chlorofluorocarbon-based solvent that does not change chemically is used.

Further, in recent years, as a cleaning agent with low environmental pollution and high safety, U.S. Pat. No. 4,511,488, 4,640,719.
Also proposed are terpenes such as limonene, pinene, dipentene and the like as found in Japanese Patent No. 4,740,247 and the like.

[Problems to be Solved by the Invention]

However, even if these cleaning agents are taken, they do not satisfy all the conditions required for the cleaning agent composition, such as the flux removing property, the rinsing property of the cleaning agent adhering to the printed circuit board and the low toxicity. It was In other words, cleaning agents using chlorine-based and CFC-based solvents are safe, toxic, and
The water-based cleaning agent has a large problem in environmental pollution and the like, and the water-based cleaning agent is preferable in that it is less dangerous and less toxic than the solvent-based cleaning agent, but is slightly inferior in flux removability. Further, terpenes typified by limonene are compounds that can achieve both safety and flux removability, but they are not only a problem that they have difficulty in rinsing and cannot be rinsed with warm water, and are derived from natural products. Therefore, it is difficult to obtain stable quality, it is expensive, and the supply amount is limited, which is not practical.

Therefore, the present invention improves the drawbacks of the prior art as described above, and is excellent in flux removability and is capable of rinsing with warm water as well as rinsing with a solvent. The purpose of the present invention is to provide a cleaning composition for removal.

[Means for Solving the Problems]

Under such circumstances, as a result of intensive studies, the present inventors have found that a detergent composition containing a specific alkylene oxide compound satisfies the above conditions, and completed the present invention.

That is, the present invention provides the following general formulas (I), (II) and (III) [In the formula, R ¹ represents a hydrocarbon residue having 6 to 22 carbon atoms, R ² and R ³ represent an alkylene group having 2 to 4 carbon atoms, and Y represents a hydrogen atom or a hydrocarbon having 1 to 4 carbon atoms. Represents a residue, m is 1 to 20,
n is 0 to 20, l is 0 to 20, p is 0 to 20 and m + n ≦ 20, l
And an integer of + p ≦ 20], a cleaning composition for electronic parts containing 50% by weight or more of an alkylene oxide compound selected from the group.

In the general formulas (I), (II) and (III), R ¹ needs to be a hydrocarbon residue having 6 to 22 carbon atoms. When the carbon number is less than 6, the volatility and flammability are increased and the safety during use is lowered, and when it exceeds 22, the flux removability is lowered with the increase in viscosity. R ¹ has 6 carbon atoms
.About.22 alkyl group or aromatic hydrocarbon residue, particularly preferably C8 to C14 alkyl group or allylalkyl group.
Further, m, n, l and p are m = 1 to 20, n = 0 to 20 and l = in order to secure the affinity and permeability to the flux.
It is necessary that 0 + 20, p = 0-20, and m + n ≦ 20, l + p ≦ 20 are integers, and in particular, those in which m + n and l + p are integers of 1-10 show excellent effects. Further, Y is particularly preferably an alkyl group having 1 to 4 carbon atoms.

Specific examples of such compounds include hexyl alcohol,
2-ethylhexyl alcohol, octyl alcohol,
Higher alcohols such as lauryl alcohol, oleyl alcohol, Guerbet alcohol having 18 carbon atoms, nonylphenol, phenols such as styrenated phenol, octylic acid, lauric acid, oleic acid, stearic acid, 22 carbon atoms
Higher fatty acids such as gerberic acid, hexylamine, laurylamine, oleylamine, and gerbereamine having 18 carbon atoms, and alkylene (ethylene, propylene, butylene) oxides alone or in admixture, and further, these alkylene oxides. Examples thereof include compounds in which the terminal hydroxyl group of the adduct is methylated, ethylated or butylated with alkyl chloride or the like. Also, the number of carbon atoms is 1
The compound which added the alkylene oxide individually or by compounding to the alcohol of 4 and esterified with the C6-C22 fatty acid is also mentioned.

These alkylene oxide compounds can be blended alone or in combination of two or more, and the blending amount is 50% by weight of the cleaning composition of the present invention in order to maintain the flux removing property and ensure the sustainability. It is necessary to be above, and especially 60% by weight or more is preferable.

Incidentally, the cleaning composition of the present invention, in addition to the above essential components,
Alkylbenzene, butylcyclohexane, olefins having 8 to 18 carbon atoms, kerosene, hydrocarbon solvents such as high boiling aromatic solvents or branched hydrocarbons, ketones, dibutyl ether for the purpose of improving the fluidity and homogeneity of the liquid. An organic solvent such as ethers such as ethyl cellosolve, butyl diglycol, propyl propylene diglycol, dimethyl triglycol and dibutyl diglycol can be added. Water can also be used as long as it does not impair the uniformity as a detergent. Further, if necessary, other surfactants, rust preventives, antiseptics, antifoaming agents, phenolic antioxidants such as BHT, and amine antioxidants may be added.

In the present invention, the electronic parts are, for example, printed wiring boards used for computers and their peripheral devices, home appliances, communication devices, OA devices, other electronic application devices, etc .; IC lead frames, resistors, capacitors, contacts such as relays. Hoop materials used for members; Liquid crystal displays used for OA equipment, watches, computer equipment, toys, home appliances, etc .; Magnetic recording parts used for video / audio recording / reproducing parts and related parts; Silicon and ceramics Semiconductor materials such as wafers; electrostrictive parts such as crystal oscillators; photoelectric conversion parts used in CDs, PDs, copying machines, optical recording machines, etc. Among these, the cleaning composition of the present invention exhibits suitable cleaning performance particularly for flux or flux residue attached to the printed circuit board.

The cleaning composition of the present invention can be used in various cleaning methods such as a dipping method, an ultrasonic cleaning method, a rocking method, and a spray method,
And a desirable result can be obtained.

When the cleaning agent of the present invention is used in the step of cleaning a printed circuit board to which flux is attached, for example, first, ultrasonic cleaning is performed in an ultrasonic cleaning tank containing the cleaning composition of the present invention, and then the cleaning composition of the present invention. It is possible to perform efficient cleaning by continuously performing a method such as dipping and cleaning in a liquid bath filled with water, and finally rinsing with a solvent or warm water.

〔Example〕

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

Examples 1 to 22 and Comparative Examples 1 to 5 A printed wiring board having an IC chip mounted thereon was subjected to a flux treatment and then a solder treatment to obtain test pieces. This test piece was dipped in a cleaning liquid kept at 80 ° C., and after cleaning for 5 minutes, the flux removability from the printed wiring board and the rinsing property of the cleaning liquid were visually evaluated. The results are shown in Table 1.

(Evaluation Criteria) Flux Removability ◎: Very good with no flux residue.

◯: Flux is hardly left and is good.

Δ: Flux residue is slightly present, which is rather bad.

X: Flux remains and is bad.

Rinseability ◎: Very good.

○: Good.

Δ: Somewhat inferior

×: Bad

[Advantages of the Invention] As described above, the cleaning composition of the present invention has excellent flux removing property and rinsing property, and also has high safety and no concern about environmental pollution. It can be advantageously used in the flux cleaning process.

Claims (2)

[Claims] 1. The following general formulas (I), (II) and (III): [In the formula, R ¹ represents a hydrocarbon residue having 6 to 22 carbon atoms, R ² and R ³ each represent an alkylene group having 2 to 4 carbon atoms, and Y
Represents a hydrogen atom or a hydrocarbon residue having 1 to 4 carbon atoms, m is 1 to 20, n is 0 to 20, l is 0 to 20, p is 0 to 20 and m + n.
≦ 20, 1 + p ≦ 20 is an integer], and a cleaning composition for electronic parts, containing 50% by weight or more of an alkylene oxide compound selected from the group: 2. R ^{1 in the} general formulas (I), (II) and (III)
The cleaning composition according to claim 1, wherein is an aliphatic hydrocarbon residue having 6 to 22 carbon atoms.