JP2973379B2 - Aqueous liquid detergent composition for cleaning electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based cleaning agent which is useful for cleaning electronic components and which can be used instead of a chlorofluorocarbon-based solvent and a chlorofluorocarbon-based solvent.

[0002]

2. Description of the Related Art Solder flux used for liquid crystal cells and printed circuit boards, precision parts, metal parts for electronic parts such as jigs and tools used in the assembling process, printed wiring, integrated circuits, corrosion processed parts such as shadow masks and the like. For electronic components such as these, a high degree of cleaning finish is pursued, and from the viewpoint of economy and the like, it is required to highly clean many components with a certain cleaning agent.

For example, in manufacturing a liquid crystal cell, the upper and lower substrates are bonded together with an adhesive at their peripheral edges, leaving a part of an opening, in order to fill the liquid crystal between two substrates on which transparent electrodes are formed. To form an empty liquid crystal cell. In this empty cell, the opening is immersed in a liquid crystal substance in a vacuumed injection chamber, and then the injection chamber is opened to the atmosphere, whereby the liquid crystal substance is sucked between the substrates (liquid crystal chamber) and the opening is sealed. As a result, a liquid crystal cell in which a liquid crystal substance is sealed is formed between the substrates.

[0004] However, it is inevitable that a gap portion where the liquid crystal cell substrates oppose each other with a small gap is formed outside the bonding portion between the two liquid crystal cell substrates. Therefore, at the time of injecting the liquid crystal into the empty cell, the liquid crystal enters the gap due to capillary action. Since electrode terminals for applying a signal to the transparent electrode are formed at high density while maintaining insulation in each of the voids, if the liquid crystal in this portion is left as it is, the liquid crystal is exposed to the air. Dissolve contaminants and easily cause insulation failure. Therefore, it is necessary to wash and remove the liquid crystal. However, since the gap of the void is as narrow as 10 μm or less, a high degree of cleaning performance is required for cleaning and removing the entered liquid crystal.

In the electronics industry, a rosin-based solder flux is used for soldering a printed circuit board. Such a flux is used to maintain high quality of a printed circuit board and a final product. After completion of the attaching work, it is required to wash with high cleanliness.

Furthermore, precision metal parts used in the manufacture of electronic equipment cannot be contaminated with oils, fats, machine oils, grease, etc. during processing, processing and assembly. Since these stains greatly affect the performance of the final product, advanced degreasing and cleaning are required. The same applies to jigs and tools used for assembling and processing metal parts.

[0007] In the fields where a high cleaning ability is required as described above, a CFC-based solvent and a chlorine-based solvent have been mainly used. However, while these solvents have excellent cleaning performance, they have a serious problem in environmental safety, and in recent years, demands for aqueous cleaning agents have been increasing.

JP-A-3-62896 discloses a detergent composition containing 70% by weight or more of a cyclic saturated hydrocarbon, and further contains 0.1 to 30% by weight of an aliphatic alcohol and / or a surfactant. It is described that an agent can be added. However, this detergent composition is a non-aqueous detergent mainly composed of an organic solvent, and has problems in safety and working environment.

JP-A-3-146597 reports a cleaning composition for printed circuit boards containing an aliphatic hydrocarbon having 8 to 20 carbon atoms and an organic compound having a polar group. Alcohols, ethers, esters, ketones, and the like are shown as the organic compounds. It also describes that 0.001 to 10% by weight of a surfactant can be blended. However, this detergent composition is also a non-aqueous detergent mainly composed of an aliphatic hydrocarbon, and has the same problems as described above.

Further, JP-A-3-153799 discloses an aliphatic hydrocarbon having 8 to 11 carbon atoms, a monohydric alcohol, an aliphatic dihydric alcohol mono-lower alkyl ether and / or an aliphatic dihydric alcohol monohydric alcohol. A cleaning agent for a brake device comprising a lower alkyl ether acetate has been reported.

Although the use of aliphatic hydrocarbons in detergents has been reported as described above, any of them is a non-aqueous detergent that uses itself as a main solvent component, and its properties are poor. It only shows that improvement can be achieved with alcohol or a surfactant.

[0012]

SUMMARY OF THE INVENTION The present invention provides a liquid crystal material,
An object of the present invention is to provide a water-based cleaning agent for electronic components, which has a high cleaning performance for solder flux and the like.

[0013]

DISCLOSURE OF THE INVENTION The present invention is for cleaning electronic parts .
The aqueous liquid detergent composition comprises the following components (a) and (b)
It contains a component (c).

(A) A compound represented by the following formula:

Embedded image (R ₁ : hydrogen or an alkyl or alkenyl group having 1 to 5 carbon atoms; p: a number of 2 to 4 q: an average number of moles of alkylene oxide added;
Number of ~ 20. However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture (r: the number of 1-3)

(B) a surfactant;

(C) Paraffinic hydrocarbons represented by Chemical Formula 4.

Embedded image

[0017]

DETAILED DESCRIPTION OF THE INVENTION The component (a) of the present invention is an alkylene oxide adduct of phenol or a short-chain alkyl or alkenyl phenol in which a phenolic hydroxyl group is substituted with 1 to 3 benzene rings. Chemical 5
The compound represented by formula (7).

[0018]

Embedded image (R ₁ : hydrogen or an alkyl or alkenyl group having 1 to 5 carbon atoms; p: a number of 2 to 4 q: an average number of moles of alkylene oxide added;
Number of ~ 20. However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture.)

[0019]

Embedded image (R ₁ : hydrogen or an alkyl or alkenyl group having 1 to 5 carbon atoms; p: a number of 2 to 4 q: an average number of moles of alkylene oxide added;
Number of ~ 20. However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture.)

[0020]

Embedded image (R ₁ : hydrogen or an alkyl or alkenyl group having 1 to 5 carbon atoms; p: a number of 2 to 4 q: an average number of moles of alkylene oxide added;
Number of ~ 20. However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture.)

(CpH ₂ pO) in the component (a) indicates that ethylene oxide, propylene oxide or butylene oxide is added alone or as a mixture. In the case of mixed addition, block addition or random addition may be used. .
In particular, a single adduct of ethylene oxide and a block adduct of ethylene oxide and propylene oxide are preferred.
The average addition mole number q of the alkylene oxide is from 1 to 20, preferably from 1 to 10.

The component (a) is preferably incorporated in the detergent composition of the present invention in an amount of 0.1 to 60% by weight, more preferably 0.5 to 40% by weight. As the surfactant of the component (b), anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants are used alone or in combination of two or more. Particularly, anionic surfactants are used. Alternatively, a nonionic surfactant is preferred.

Examples of the anionic surfactant include the following. 1) a linear alkylbenzene sulfonate having an alkyl group having an average of 8 to 16 carbon atoms,

2) an α-olefin sulfonate having an average of 10 to 20 carbon atoms; 3) an alkyl or alkenyl group having 4 to 1 carbon atoms.
0 dialkyl sulfosuccinate

4) A sulfonate of a lower alkyl ester of a fatty acid represented by Chemical formula 8 or a disalt of a sulfonated fatty acid

Embedded image (R: alkyl group or alkenyl group having 8 to 20 carbon atoms Y: alkyl group having 1 to 3 carbon atoms or counter ion Z: counter ion)

5) an alkyl sulfate having an average of 10 to 20 carbon atoms, 6) an ethylene oxide having a linear or branched alkyl or alkenyl group having an average of 10 to 20 carbon atoms and an average of 0.5 to 8 mol. 7) saturated or unsaturated fatty acid salts having an average of 10 to 22 carbon atoms.

As the counter ion in these anionic surfactants, alkali metal salts such as sodium and potassium are usually used. Further, examples of the nonionic surfactant include the following. Here, p indicates the average number of moles of alkylene oxide added. As the alkylene oxide, ethylene oxide, propylene oxide, butylene oxide or a mixed adduct thereof is used.

1) Polyoxyalkylene (p = 3-4)
0) alkyl or alkenyl (C ₁₀ -C ₂₂ ) ether 2) polyoxyalkylene (p = 3-40) alkyl or alkenyl (C ₅ -C ₁₂ ) phenyl ether

3) Polyoxyalkylene (p = 0.5
40) alkyl or alkenyl (C ₁₀ -C ₂₂₎ amine 4) polyoxyalkylene (p = 0.5 to 50) alkyl or alkenyl (C ₁₀ -C ₂₂₎ amide 5) ethylene oxide / propylene oxide block adduct (Pluronic Type surfactant)

The surfactant (b) is preferably incorporated in the detergent composition of the present invention in an amount of 0.1 to 60% by weight, more preferably 0.5 to 40% by weight.

The paraffinic hydrocarbon of the component (c) has a linear or branched C6-C18 (C = 6-1).
8) a chain saturated hydrocarbon, preferably having 8 to 8 carbon atoms.
Sixteen. These paraffinic hydrocarbons may be used alone or as a mixture.

The paraffinic hydrocarbon as the component (c) is preferably incorporated in the detergent composition of the present invention in an amount of 0.1 to 60% by weight, more preferably 0.5 to 40% by weight. . The components (a) and (b) are present in the detergent composition of the present invention in a weight ratio of (a) / (b) = 1/1.
It is preferable to mix in the range of 100 to 100/1, more preferably 1/10 to 10/1.

Further, the above components (a) and (c) are in a weight ratio of (a) / (c) = 100/1 to 1/3, more preferably 10/1 to 1/1. And (a),
It is desirable to mix both components (c) or three components (a), (b) and (c).

By blending each component in these ranges, a water-based cleaning agent having higher cleaning performance can be realized.

In the cleaning composition of the present invention, (a)
Although excellent cleaning performance can be obtained by the components (b) and (c) , the cleaning performance is further improved by adding the solvent of the following formula (d) as the component (d), and the cleaning performance is more improved especially with the same cleaning liquid. The so-called stamina washability, which can highly wash the articles of the present invention, is improved.

[0036]

Embedded image (R ₁ : an alkyl group or alkenyl group having 1 to 8 carbon atoms, p: a number of 2 to 4, q: an average number of added moles of alkylene oxide, and 1
Number from 10 to 10. However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture.)

The solvent of the component (d) is an alkylene oxide adduct of a saturated or unsaturated alcohol having 1 to 8, preferably 3 to 6 carbon atoms. (CpH ₂ pO) in Chemical formula 9 indicates that ethylene oxide, propylene oxide and butylene oxide are added alone or in combination. In the case of mixed addition, block addition or random addition may be used.
In particular, a single adduct of ethylene oxide and a block adduct of ethylene oxide and propylene oxide are preferred.
The average addition mole number q of the alkylene oxide is from 1 to 10, preferably from 2 to 6. In the case of a block adduct of ethylene oxide and propylene oxide, one having an average addition of 1 to 3 mol of ethylene oxide and 1 to 5 mol of propylene oxide on average is preferable.

The component (d) is preferably incorporated in the detergent composition of the present invention in an amount of 0.1 to 60% by weight, more preferably 0.5 to 40% by weight.

[0039] The cleaning composition of the present invention may optionally contain other optional components. These optional components include: alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; builders such as citrate, phosphate, and ethylenediaminetetraacetate; ethylene glycol for maintaining liquid stability;
Glycols such as propylene glycol, methanol,
Hydrotropes such as lower alcohols such as ethanol, toluenesulfonate and xylenesulfonate; and rust preventives such as benzotriazole and preservatives such as benzoate can be added according to the purpose. .

The cleaning composition of the present invention comprises the component (a)
The component (b), component (c), component (d), or a mixture of these components and optional components and water can be prepared as an aqueous liquid detergent composition.

The cleaning composition of the present invention can be used for cleaning at the same concentration as the composition, or can be diluted with water (for example, as an aqueous solution of 5 to 70% by weight). .

[0042]

According to the present invention, the detergent (a)
By using the components (b) and (c) to form a detergent composition, high cleaning performance can be exhibited for electronic components.

By using a surfactant and / or a paraffinic hydrocarbon, the cleaning performance can be further improved.

The detergent composition of the present invention is a water-based detergent, has no problem of environmental destruction such as a chlorofluorocarbon-based solvent or a chlorine-based solvent, and is mainly composed of an organic solvent such as an aliphatic hydrocarbon. There is no flame or work environment problem unlike non-aqueous cleaning agents.

The cleaning composition of the present invention is suitable for use in fields requiring high cleaning performance, especially as a cleaning agent for electronic parts. For example, a cleaning agent for liquid crystal cells and a cleaning agent for solder flux such as rosin. It is used as a cleaning agent for degreasing metal parts, jigs and tools.

Example 1: Use as a detergent for liquid crystal cells A detergent composition having the composition shown in Tables 1 to 4 below (100 W with water)
(balance to t%) was prepared, and its performance was evaluated as follows, and the results are shown in Tables 1 to 4.

Method for Evaluating Detergency of Liquid Crystal Cell A liquid crystal material is applied to the gaps of the liquid crystal cell and left at room temperature for 10 minutes. Ultrasonic cleaning is performed at 40 ° C. for 2 minutes in the stock solution of each prepared cleaning agent, and after rinsing sufficiently with pure water, the cleaning property is determined by a polarizing microscope.

The evaluation criteria for cleaning properties are shown below. ○ The above is a pass. ◎: The void portion was completely cleaned. ：: The void portion was almost cleaned. Δ: A large amount of liquid crystal remained in the void portion.

Example 2: Use as a cleaning agent for solder flux A cleaning composition having the composition shown in Tables 2 to 4 below (100 W with water)
(balance to t%) was prepared and its performance was evaluated as follows, and the results are shown in Tables 2 to 4.

Method for Evaluating Washability of Printed Board A rosin-based solder flux is placed on a board manufactured from a copper-clad laminate, and sintering is performed at 210 ° C. for 5 minutes.

In the stock solution of each prepared detergent,
Perform spray cleaning at 40 ° C. for 3 minutes. This spray cleaning is performed using one full cone type nozzle under the conditions of 5 liters of a detergent and a spray pressure of 1 kg / cm ² using a laboratory spray washer. Then, after rinsing sufficiently with pure water, the flux washing rate is calculated from the difference in weight before and after washing, and evaluated according to the following evaluation criteria. ○ The above is a pass.

A: Cleaning rate 90 to 100% O: Cleaning rate 70 to 89% C: Cleaning rate 50 to 69% X: Cleaning rate less than 50%

[0053]

[0054]

[0055]

[Table 2] Example Sample No. 12 13 14 15 16 17 18 19 Composition (wt%): (a) component * ¹ ; R ₁ = H, p = 3, q = 1 55 55 55 55 55 5 (b) Ingredients: ASS-Na * ² 5 5 5 5 5 5 5 5 AE (p = 8) * ³ − − − − − − − − 10 APE (p = 8) * ⁴ 10 10 10 10 10 10 10 − (c) Component * ⁵ ; C = 6 2 − − − − − − − C = 8 − 2 − − − − − − − C = 10 − − 2 − − − − − C = 12 − − − 2 − − − 2 C = 14 − − − − 2 − − − C = 16 − − − − − 2 − − C = 18 − − − − − − − 2 − Evaluation: Detergency of liquid crystal cell ○ ○ 〜 ◎ ○ 〜 ◎ ○ 〜 ◎ ○ 〜 ◎ ○ 〜 ◎ ○ ○ 〜 ◎ Cleaning properties of printed circuit board ○ ○ ○ ○ ○ ○ ○ ○ * 1) (a) component:

Embedded image * 2) ASS-Na: sodium dioctyl sulfosuccinate * 3) AE (p = 8): polyoxyethylene (p = 8) dodecyl ether * 4) APE (p = 8): polyoxyethylene (p = 8) nonyl Phenyl ether * 5) Indicated as C number of paraffinic hydrocarbon (for example, C ₁₂ indicates C ₁₂ H ₂₅ )

[0056]

[Table 3] Example Sample No. 20 21 22 23 24 25 26 Composition (wt%): (a) component * ¹ ; R ₁ = H, p = 3, q = 1 55 55 55 55 5 (b) component; ASS-Na * ² 5 5 5 5 − − − APE (p = 8) * ³ 10 10 10 10 − − − (c) component * ⁴ ; C = 12 0.5 0.5 0.5 0.5 0.5 − 0.5 C = 14 0.5 0.5 0.5 0.5 0.5 - 0.5 C = 16 0.5 0.5 0.5 0.5 0.5 - 0.5 (d) component _{^{* 5; C 2 H 5 O}} (EO) 2 H 5 - - - - - - C 4 H 9 O (EO) 3 H - 5 − − − − − C ₄ H ₉ O (EO) ₁ (PO) ₂ H − − 5 − − − − C ₈ H ₁₇ O (EO) ₃ H − − − 55 5 − − Evaluation: Liquid crystal cell cleaning ○ ◎ ◎ ◎ ◎ ◎ ○ 〜 ◎ ○ ○ 〜 ◎ Cleaning performance of printed circuit board ○ ○ ◎ ◎ ○ ○ ○ * 1-4) Same as the margins of the above tables * 5) EO is ethylene oxide and PO is propylene oxide Show

[0057]

[Table 4] Comparative sample No. 27 28 29 30 31 32 33 34 Composition (wt%): (a) component or similar * ¹ ; R ₁ = H, p = 2, q = 30 − 5 − − − − 55 _{R 1 = C 8 H 17,} p = 2, q = 1 - - 5 5 5 5 - 5 (b) ^{component; LAS-Na * 2 5 5} 5 5 5 5 - - ASS-Na * 3 5 5 5 5 5 5 − − APE (p = 8) * ⁴ 5 5 5 5 5 5 − − APE (p = 15) * ⁵ 5 5 5 5 5 5 − − (c) component * ⁶ ; C = 6 − − − 2 22−2 C = 18 − − − − 22−2 (d) component analog * ⁷ ; C ₄ H ₉ O (EO) ₁₂ H − − − − − 5 −5 Evaluation: Detergency of liquid crystal cell × × × △ △ △ × △ Printed circuit board washability × × × × △ △ × × * 1-7) Same as the margins of the above tables * 2) LAS-Na: linear alkyl (C ₁₂ ) sodium benzenesulfonate

Continuation of the front page (72) Inventor Naoko Masuda 1-3-7 Honjo, Sumida-ku, Tokyo Inside Rion Co., Ltd. (56) References JP-A-5-51599 (JP, A) JP-A-3-111496 (JP, A) JP-A-1-263200 (JP, A) JP-A-59-176398 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C11D 3/20 C11D 10 / 02 C23G 5/032 H01L 21/304

Claims (1)

(57) [Claims] (1) (a) a compound represented by the following formula: (R ₁ : hydrogen or an alkyl or alkenyl group having 1 to 5 carbon atoms; p: a number of 2 to 4 q: an average number of moles of alkylene oxide added;
Number of ~ 20. However, the same alkylene oxide may be added singly, or two or more alkylene oxides may be mixed and added. R: Number of 1-3) (b) Surfactant (c) paraffinic hydrocarbons [2 reduction] represented by _{2 C n H 2n + 2 (} n: number of 6 to 18) the electronic component washing aqueous liquid detergent composition containing a.