WO2019163465A1

WO2019163465A1 - Rinse agent and method for using rinse agent

Info

Publication number: WO2019163465A1
Application number: PCT/JP2019/003388
Authority: WO
Inventors: 堀　薫夫; 悠紀赤松
Original assignee: 化研テック株式会社
Priority date: 2018-02-26
Filing date: 2019-01-31
Publication date: 2019-08-29
Also published as: TW201940684A; CN110741738A; JP7320839B2; CN110741738B; TWI756511B; JPWO2019163465A1

Abstract

The present invention provides a rinse agent which contains at least a water-soluble glycol ether compound and water, and which is configured such that: the rinse agent has a solubility of benzyl alcohol of 10 vol% or more; and 50-1,000 parts by weight of water is blended per 100 parts by weight of the water-soluble glycol ether compound.

Description

Rinse agent and method of using rinse agent

The present invention relates to a rinse agent and a method of using the rinse agent. In particular, by including a predetermined amount of water, it is excellent in environmental safety (for example, safety in work environment), while rinsing that can exhibit excellent rinsing properties after washing the object to be cleaned with a specific cleaning agent (benzyl alcohol, etc.) And a method of using such a rinse agent.

Industrial cleaners, for example, flux cleaners, are widely used to remove flux and flux residue after solder paste is used to bond electronic components that are to be cleaned to the electrodes of the printed wiring board. ing.
For this reason, a cleaning agent for flux composed of a glycol-based cleaning agent composed mainly of various glycol-based compounds is used because it exhibits good cleaning properties and has relatively few environmental problems.

WO2009 / 020199 Japanese Patent Laid-Open No. 7-080423 Japanese Patent Laid-Open No. 5-175541

A non-halogen organic solvent (A) represented by the specific structural formula, an amine compound (B) represented by the specific structural formula, an amino group-free chelating agent (C), and, if necessary, a predetermined amount A cleaning composition for removing lead-free solder flux comprising water is disclosed (see, for example, WO2009 / 020199 (Patent Document 1)).

And a rinsing step using water at 5 to 100 ° C. after performing the cleaning step using a cleaning composition comprising a nonionic surfactant and / or a hydrocarbon compound. (See, for example, Japanese Patent Laid-Open No. 7-080423 (Patent Document 2)).

Furthermore, a cleaning agent containing a specific glycol ether compound is brought into contact with the substrate on which the rosin solder flux is adhered, and the flux is removed from the substrate, and then a lower alcohol or an aqueous solution thereof is contacted as a rinsing agent. A method for cleaning a substrate to be squeezed is disclosed (for example, see Japanese Patent Application Laid-Open No. 5-175541 (Patent Document 3)).

However, the flux cleaning agent itself disclosed in Patent Document 1 has a problem that it usually has a high boiling point and is difficult to dry in a short time. Further, the flux cleaning agent has a problem that the degree of cleanliness with respect to the object to be cleaned is likely to decrease.
For this reason, there has been a problem that it is necessary to provide a process for drying an object to be cleaned while rinsing agents such as water and hydrous alcohol are used to replace the flux cleaning agent.

Moreover, in the case of the cleaning method disclosed in Patent Document 2, there is a problem that the type of the cleaning composition is excessively limited. Further, in the case of the cleaning method, there has been a problem that the water temperature in the rinsing step must be strictly controlled to a value within a predetermined range (5 to 100 ° C.).
In addition, when water is used as a rinse agent, there is a problem that not only the drying property is bad, but also the hydrophobic flux cleaning agent such as benzyl alcohol has low solubility, and thus it is likely to cause poor rinsing.

In the substrate cleaning method disclosed in Patent Document 3, water-containing alcohol is used as the rinse agent, so that the solubility in the hydrophobic flux cleaning agent is relatively good. However, the rinse agent has a problem that the flash point is low and environmental safety (for example, work environment safety) is insufficient.

Therefore, as a result of intensive studies, the inventor of the present invention is a rinsing agent having a predetermined ratio of the blending amount of the water-soluble glycol ether compound and the blending amount of water, and the solubility of benzyl alcohol in the rinsing agent. It has been found that the conventional problem can be solved by setting the value to a predetermined value or more.
That is, the present invention is an aqueous rinsing agent excellent in environmental safety (for example, working environment safety) used after washing an object to be cleaned with a hydrophobic specific cleaning agent (benzyl alcohol or the like), and It aims at providing the rinse agent which can exhibit the outstanding rinse property, and the usage method of such a rinse agent.

According to the present invention, a rinsing agent containing at least a water-soluble glycol ether compound and water and having a solubility of benzyl alcohol of 10 vol% or more, and the amount of water is 100 parts by weight of the water-soluble glycol ether compound. A rinse agent is provided that is 50 to 1000 parts by weight. According to the present invention, the above-described problems can be solved.
Thus, it is a rinse agent excellent in environmental safety (for example, working environment safety) in which the ratio between the blending amount of the water-soluble glycol ether compound and the blending amount of water is a value within a predetermined range.
In addition, by setting the solubility of benzyl alcohol in the rinse agent per unit volume to a predetermined value or more, it is possible to rinse various cleaning agents including hydrophobic compounds such as benzyl alcohol, which have been difficult to rinse with water conventionally. . Therefore, it is possible to provide a rinse agent in which the predetermined cleaning agent remains very little in the object to be cleaned.

Further, in constituting the rinse agent of the present invention, the light transmittance in the temperature range from room temperature to 80 ° C. is preferably 90% or more.
Thus, by having a predetermined light transmittance in a predetermined temperature range, it can be judged that it has virtually no cloud point, without phase-separating in the temperature range from room temperature to 80 degreeC. Therefore, in a normal use temperature range, it has no cloud point and maintains transparency, so that it is possible to provide a rinse agent with good usability.

In constituting the rinse agent of the present invention, the flash point of the rinse agent is preferably 50 ° C. or higher.
Thus, even if it has a flash point, the rinse agent which is more excellent in environmental safety (for example, work environment safety) can be provided by setting it as the value more than predetermined temperature.

Further, in constituting the rinse agent of the present invention, the initial contact angle of water with respect to the resist surface of the printed circuit board whose surface is protected by the cured photosensitive solder resist is θ ₁ , and the printed circuit board is changed to a 30 ° C. rinse agent. When the contact angle of water with respect to the resist surface of the printed circuit board after being immersed for 10 minutes and dried at 100 ° C. for 5 minutes is θ ₂ , | θ ₂ −θ ₁ | is 3 ° or less. Is preferred.
Thus, by setting it as the absolute value of the difference of a predetermined contact angle, the rinse agent with little bad influence with respect to to-be-cleaned objects, such as a printed circuit board, can be provided quantitatively.

In constituting the rinse agent of the present invention, the water-soluble glycol ether compound preferably has a boiling point (under atmospheric pressure) of 250 ° C. or lower.
Thus, by restricting the boiling point of the water-soluble glycol ether compound, the rinse agent can be regenerated more easily and the drying property is further improved.

In constituting the rinse agent of the present invention, the water-soluble glycol ether compound includes ethylene glycol monopropyl ether, ethylene glycol mono-tert-butyl ether, 3-methoxy-3-methylbutanol, 3-methoxybutanol, ethylene glycol mono It is preferably at least one compound selected from the group consisting of isopropyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol monomethyl ether, diethylene glycol ethyl methyl ether, triethylene glycol dimethyl ether and diethylene glycol dimethyl ether.
By using such a water-soluble glycol ether compound, it is possible to provide a rinse agent that is excellent in environmental safety (for example, safety in work environment), has little residual cleaning agent, and is relatively inexpensive. .

Further, in constituting the rinse agent of the present invention, the rinse agent further contains an amine compound having a boiling point of 250 ° C. or less, and the compounding amount of the amine compound is 0 with respect to 100 parts by weight of the water-soluble glycol ether compound. It is preferably 1 to 10 parts by weight.
By blending a predetermined amount of the amine compound having a predetermined boiling point as described above, compatibility with the flux residue contained in the cleaning agent can be increased, and the rinse agent can be regenerated more easily, and In addition, it is possible to provide a rinse agent that can efficiently clean an object to be cleaned with a rinse agent that has little adverse effect on the object to be cleaned such as a printed circuit board.

Another aspect of the present invention is a method of using a rinse agent characterized by having the following steps (1) to (2).
(1) A step of cleaning the flux adhering to the object to be cleaned with a cleaning liquid containing benzyl alcohol and a hydrophobic glycol ether compound or one of them (2) At least the object to be cleaned cleaned in the above step (1) A rinsing agent containing a water-soluble glycol ether compound and water and having a solubility of benzyl alcohol of 10 vol% or more, and the amount of water is 50 to 1000 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound. Rinsing step using a rinsing agent Rinse with the ratio of the blending amount of the water-soluble glycol ether compound and the blending amount of water being within a predetermined range and the solubility of benzyl alcohol being not less than a predetermined value. By using the agent, environmental safety is ensured even after the object to be cleaned is efficiently cleaned using the specified cleaner. A rinse process excellent in (for example, work environment safety) can be performed.
In addition, even in the case where a predetermined cleaning agent is used in the cleaning process, various cleaning agents can be rinsed, including hydrophobic compounds such as benzyl alcohol, which have been difficult to rinse with water. The rinsing process can be performed with a rinsing agent in which the predetermined cleaning agent remains very little in the object.

According to the present invention, it is an aqueous rinsing agent excellent in environmental safety (for example, working environment safety) used after washing an object to be cleaned with a hydrophobic specific cleaning agent (benzyl alcohol or the like), and It becomes possible to provide a rinsing agent capable of exhibiting excellent rinsing properties and a method of using such a rinsing agent.

FIG. 1 is a diagram provided to explain the relationship between the solubility (vol%) of benzyl alcohol and the evaluation point (relative value) of compatibility (rinsability) with respect to the unit volume (100 ml) of the rinse agent.

[First embodiment]
The first embodiment is a rinsing agent containing at least a water-soluble glycol ether compound and water, and having a solubility of benzyl alcohol of 10 vol% or more, and the blending amount of water with respect to 100 parts by weight of the water-soluble glycol ether compound Is a rinse agent characterized by having a value within the range of 50 to 1000 parts by weight.
In other words, the rinse agent is a rinse agent containing at least a water-soluble glycol ether compound and water, and having a solubility of benzyl alcohol of 10 vol% or more,
The water content is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.
Hereinafter, the rinse agent of the first embodiment of the present invention will be specifically described with reference to the drawings as appropriate. In the present specification, the notation in the form of “A to B” means the upper and lower limits of the range (that is, A or more and B or less), and the unit is not described in A, but the unit is described only in B The unit of A and the unit of B are the same.

1. Water-soluble glycol ether compound The water-soluble glycol ether compound is the main component of the rinse agent. Here, the “glycol ether compound” means a compound in which one or both of the hydroxyl groups of the diol or its condensate are etherified.
And the glycol ether compound which comprises the rinse agent of this invention is different from what was used at said 1st process (process (1)) (hydrophobic glycol ether compound contained in a washing | cleaning liquid), and a water-soluble glycol ether compound It is.
This is because by using such a water-soluble glycol ether compound, even if 100 ml is dissolved in 100 parts by weight of water, no suspension or separation occurs.
This is because it is possible to remove the hydrophobic benzyl alcohol or hydrophobic glycol ether compound remaining in the object to be cleaned and to efficiently rinse the object to be cleaned.
In addition, as a water-soluble glycol ether compound used here, the thing which shows the water solubility whose solubility (measurement temperature: 20 degreeC) in water exceeds 50 weight% is preferable, for example.

The water-soluble glycol ether compound used in the present invention preferably has a boiling point (under atmospheric pressure) usually at a value of 250 ° C. or lower. That is, the water-soluble glycol ether compound preferably has a boiling point (under atmospheric pressure) of 250 ° C. or lower. In this embodiment, “atmospheric pressure” is 1013.25 hPa.
The reason for this is that by using a water-soluble glycol ether compound having such a boiling point, the rinse agent can be more easily regenerated, and the resulting rinse agent is no longer flammable, and environmental safety ( This is because, for example, the working environment safety is further improved.
Therefore, even if the rinse agent of this invention has a flash point, it is preferable that it is 50 degreeC or more, or does not have a flash point.
That is, during the operation of the cleaning apparatus, there is no danger of igniting the rinse agent, and a cleaning operation including a very stable rinsing process can be performed.
Therefore, the boiling point of the water-soluble glycol ether compound is more preferably set to a value within the range of 120 to 230 ° C., and further preferably set to a value within the range of 140 to 220 ° C.

Specific examples of such water-soluble glycol ether compounds include ethylene glycol monopropyl ether (PS), ethylene glycol mono-tert-butyl ether (ETB), 3-methoxy-3-methylbutanol (MMB), 2- Methoxybutanol (2MB), 3-methoxybutanol (3MB), ethylene glycol monoisopropyl ether (iPG), diethylene glycol isopropyl methyl ether (IPDM), dipropylene glycol monomethyl ether (DPM), diethylene glycol ethyl methyl ether (MEDG), triethylene List at least one compound selected from the group consisting of glycol dimethyl ether (DMTG) and diethylene glycol dimethyl ether (DMDG). It can be.
The said water-soluble glycol ether compound may be used individually by 1 type, and may be used in combination of multiple types. Examples of combinations of the plurality of water-soluble glycol ethers include PS and MMB, PS and 3MB, PS and IPDM, PS and DPM, PS and DMTG, ETB and MMB, ETB and DPM, MMB and DPM, and MMB. DMTG is mentioned. Needless to say, three or more of the above water-soluble glycol ether compounds may be combined.

In one aspect of the present embodiment, the water-soluble glycol ether compound may be a compound having a structure represented by the following formula 1, formula 2, or formula 3.
HO— [C ₃ H ₆ —O] ₂ —R ¹ (Formula 1)
R ² —O — [(CH ₂ ) ₂ —O] ₃ —R ³ (Formula 2)
CH ₃ —CR ⁴ R ⁵ —CR ⁶ R ⁷ —CH ₂ —OH (Formula 3)
(In Formula 1, R ¹ represents an alkyl group having 1 to 3 carbon atoms. In Formula 2, R ² represents an alkyl group having 1 or 2 carbon atoms, and R ³ represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms. In formula 3, one of R ⁴ and R ⁶ represents a hydrogen atom and the other represents an alkoxy group having 1 or 2 carbon atoms, and in formula 3, one of R ⁵ and R ⁷ is a hydrogen atom. And the other represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms.)

In formula 1, as the group represented by — [C ₃ H ₆ —O] ₂ —, for example, a group represented by — [(CH ₂ ) ₃ —O] ₂ —, — [CH ₂ CH (CH ₃ ) a group represented by —O] ₂ — and a group represented by — [CH (CH ₃ ) CH ₂ —O] ₂ —. In this embodiment, the group represented by — [C ₃ H ₆ —O] ₂ — in Formula 1 may be a group represented by — [CH ₂ CH (CH ₃ ) —O] ₂ —. preferable.

If these water-soluble glycol ether compounds are ethylene glycol monopropyl ether, ethylene glycol mono-tert-butyl ether, 3-methoxy-3-methylbutanol, dipropylene glycol monomethyl ether, triethylene glycol dimethyl ether, etc., they are safe. It can be used as a more suitable water-soluble glycol ether compound because of its compatibility (rinseability) with a hydrophobic compound and a reason for drying.

2. Water The water rinse agent is characterized in that the amount of water is within the range of 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound. In other words, the water content is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.
The reason for this is that if the amount of water is excessively reduced, the rinsing agent obtained may increase the flammability or adversely affect the resist (change in contact angle).
On the other hand, if the amount of water is excessively large, the rinsing property by the rinse agent or the re-adhesion prevention property of the flux may be remarkably lowered.

Therefore, in constituting the rinse agent, the amount of water is preferably set to a value within the range of 80 to 600 parts by weight, and within the range of 100 to 400 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound. More preferably, the value of In other words, the amount of water is preferably 80 to 600 parts by weight, and more preferably 100 to 400 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound.
And as water to mix | blend with respect to a water-soluble glycol ether compound, a pure water (ion-exchange water, distilled water, etc.) is preferable, and it is preferable to have a cleanliness | conductivity whose electrical conductivity is about 10 microsiemens / cm. It is more preferable to have cleanliness of about cm. In other words, the water has an electric conductivity of preferably 1 to 10 μS / cm, and more preferably 1 to 5 μS / cm.

3. Solubility Moreover, regarding the characteristics of the rinse agent, the solubility of benzyl alcohol with respect to the unit volume (100 ml) of the rinse agent is set to a value of 10 vol% or more. In other words, the solubility of benzyl alcohol with respect to the unit volume (100 ml) of the rinse agent is 10 vol% or more.
That is, the rinsing agent used in the present invention is configured as described above in order to rinse the object to be cleaned even when a specific cleaning agent such as benzyl alcohol or a hydrophobic glycol ether compound is used. Is provided.
Here, the reason why the solubility of benzyl alcohol is used as an index is that benzyl alcohol has the lowest solubility in the rinse agent among benzyl alcohol and hydrophobic glycol ether compounds.
Moreover, if the solubility of benzyl alcohol with respect to the unit volume (100 ml) of the rinsing agent is a value of 10 vol% or more, the change in turbidity value at the time of washing can be reduced as much as possible, and the rinsing is rich in transparency. This is because the state of the agent can be maintained.

However, when the solubility of benzyl alcohol with respect to the unit volume (100 ml) of the rinse agent becomes excessively large, the types of water-soluble glycol ether compounds that can be used may be excessively limited.
Therefore, the solubility of benzyl alcohol with respect to the unit volume (100 ml) of the rinse agent is preferably set to a value within the range of 15 vol% to 40 vol%, and more preferably set to a value within the range of 20 vol% to 30 vol%. .

Here, with reference to FIG. 1, the relationship between the solubility (vol%) of benzyl alcohol and the evaluation point (relative value) of compatibility (rinse or rinse) with respect to the unit volume (100 ml) of the rinse agent. Will be explained.
That is, the horizontal axis of FIG. 1 shows the solubility (vol%) of benzyl alcohol with respect to the unit volume of the rinsing agent, and the vertical axis shows the evaluation point (relative to the compatibility (rinsing property or rinsing property)). Value). Here, the evaluation points 0, 1, 2, 3, 4, and 5 on the vertical axis respectively correspond to the evaluations E, D, C, B, A ′, and A of rinse properties in examples described later.
Judging from the characteristic curve in FIG. 1, when the solubility of benzyl alcohol is about 5 vol%, the evaluation point is still low, but when the solubility of benzyl alcohol exceeds 10 vol%, the evaluation point tends to increase rapidly. is there.
The highest evaluation score is obtained when the solubility (vol%) of benzyl alcohol exceeds about 15 vol% and is at least about 25 vol%.
Therefore, it is understood that good results can be obtained with respect to the evaluation of compatibility (rinsing property or rinsing property) by appropriately adjusting the solubility of benzyl alcohol in the rinsing agent to 10 vol% or more.

4. Amine compound having a predetermined boiling point The rinse agent used in the present invention preferably contains an amine compound having a boiling point of 250 ° C. or lower under atmospheric pressure. That is, the rinse agent preferably further contains an amine compound having a boiling point of 250 ° C. or lower.
This is because by adding an amine compound having such a boiling point, it is possible to increase the solubility of the flux without greatly hindering the regeneration of the rinse agent, thereby improving the cleaning property.
In addition, by adding such an amine compound, it is possible to effectively prevent re-adhesion of the flux, and to make the rinse agent also function as a cleaning agent.
Accordingly, the boiling point of such an amine compound is more preferably set to a value within the range of 120 to 230 ° C., and further preferably set to a value within the range of 140 to 220 ° C.

In the present embodiment, the “amine compound” means a compound in which a hydrogen atom of ammonia is substituted with a hydrocarbon group or an aromatic atomic group. The amine compound includes a primary amine, a secondary amine, and a tertiary amine. In another aspect, the amine compound includes an aliphatic amine and an aromatic amine. In yet another aspect, the amine compound includes monoamines, diamines, and polyamines.

In addition, the compounding amount of the amine compound having such a boiling point is usually within a range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound contained in the rinse agent. Is preferred. In other words, the compounding amount of the amine compound is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound.
That is, it is because the compounding effect of an amine compound may not be acquired when mix | blending too little.
On the other hand, when it mix | blends excessively, it is because the metal which comprises a washing | cleaning apparatus, the conductor in a board | substrate, etc. may be corroded, or an odor may become strong.
Therefore, the compounding amount of the amine compound is more preferably 0.2 to 5 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound contained in the rinse agent. More preferably, the value is in the range of ˜3 parts by weight.

The flash point of an amine compound having a boiling point of 250 ° C. or lower is preferably set to a value within the range of 30 to 100 ° C. That is, the amine compound preferably has a flash point of 30 to 100 ° C.
This is because, with an amine compound having such a flash point, even if a relatively large amount is added, the flash point of the rinse agent hardly fluctuates.

Accordingly, preferred examples of amine compounds having a boiling point of 250 ° C. or lower include N, N, N ′, N′-tetramethyl-1,6-hexamethylenediamine (TMHMDA), N, N, N ′, N′— Tetramethyl-1,4-diaminobutane (TMDAB), N, N, N ′, N′-tetramethyl-1,3-diaminopropane (TMDAP), dibutylamine (DBA), N, N-diethylhydroxyamine ( DEHA) and N-ethylethanolamine (MEM) may be used singly or in combination of two or more. Examples of the combination of two or more of the above amine compounds include DBA and DEHA.

In one aspect of this embodiment, the amine compound having a boiling point of 250 ° C. or lower may be a compound having a structure represented by any of the following formulas 4 to 7. In Formula 7, the group represented by —C _q H _2q — may be linear (when q is an integer of 1 to 4) or branched (q is 2). For integers of ~ 4). In Formula 7, the group represented by —C _r H _2r — may be linear (when r is an integer of 1 to 4) or branched (r is 2). For integers of ~ 4).
(CH ₃ ) ₂ —N— (CH ₂ ) _n —N— (CH ₃ ) ₂ (Formula 4)
(H— (CH ₂ ) _m ) ₂ —NH (Formula 5)
(H— (CH ₂ ) _p ) ₂ —N—OH (Formula 6)
H—C _q H _2q —NH—C _r H _2r —OH (Formula 7)
(In Formula 4, n represents an integer of 3 to 6. In Formula 5, m represents an integer of 4 or 5. In Formula 6, p represents an integer of 2 to 4. In Formula 7, q is 1. Represents an integer of ˜4, and r represents an integer of 1 to 4.)

5. Other compounding components As other components to be blended in the rinse agent, at least one of an antioxidant, an antistatic agent, a surfactant, a viscosity modifier, and the like can be given.
The blending amount of these components can be appropriately determined according to the blending purpose, but it is usually set to a value within the range of 0.01 to 10% by weight with respect to the total amount of the rinse agent. preferable.

6). Flash point It is preferable to set the flash point of the rinse agent measured according to JIS K 2265-1 and 4 (how to determine the flash point) to a value of 50 ° C or higher. That is, the rinsing agent preferably has a flash point of 50 ° C. or higher.
The reason for this is that even if the rinse agent has a flash point, if the value is 50 ° C. or higher, handling is further facilitated and safety can be further improved.
However, when the rinse agent has a flash point, if the value exceeds 120 ° C., the types of the rinse agent compounding components that can be used for regeneration are excessively limited, and the cost increases, which is economically disadvantageous. It may become.
Accordingly, the flash point of the rinsing agent is preferably set to a value within the range of 60 to 120 ° C., and more preferably set to a value within the range of 70 to 100 ° C.

7. Light transmittance In addition, it is preferable that the light transmittance (visible light transmittance) of the rinse agent in the temperature range from room temperature to 80 ° C. is 90% or more. That is, the rinsing agent preferably has a light transmittance of 90% or more in a temperature range from room temperature to 80 ° C.
This is because, in such a temperature range (room temperature to 80 ° C.), by having a predetermined light transmittance, it can be determined that there is virtually no cloud point without phase separation. . Accordingly, it is possible to provide a rinse agent that is easy to use as long as it does not have a cloud point within a predetermined temperature range.
That is, as long as the rinse agent is not phase-separated and is transparent, the benzyl alcohol, the hydrophobic glycol ether compound, etc. used in the previous washing step can be effectively dissolved. At the same time, flux re-adhesion does not occur, and it can sufficiently function as a rinse agent.
Therefore, the light transmittance of the rinse agent in the temperature range from room temperature to 80 ° C. is more preferably 95% or more, and even more preferably 98% or more. Although the upper limit of the said light transmittance is not restrict | limited in particular in the range which does not impair the effect of this invention, For example, 100% or less is mentioned.
The light transmittance was measured using a spectrophotometer (manufactured by JASCO Corporation, product name: UV-visible spectrophotometer V-530), visible light (wavelength 660 nm), room temperature (25 ° C.) to 80 ° C. Perform under the conditions of

8). Contact angle Moreover, it is preferable to reduce the surface modification with respect to a to-be-cleaned object about the rinse agent used by this invention.
That is, even if the rinse agent used in the present invention comes into contact with the object to be cleaned, the change in the contact angle of water after drying the object to be cleaned is very small, and the rinse agent of the present invention has an effect on the object to be cleaned. It can be said that there are very few.
More specifically, the initial contact angle of water with respect to the resist surface of the printed circuit board whose surface is protected by the cured photosensitive solder resist is θ _1, and the resist surface after being immersed in a rinsing agent at 30 ° C. for 10 minutes is used. When the contact angle of water is θ ₂ , the absolute value | θ ₂ −θ ₁ | of the difference between these contact angles is preferably set to a value of 3 ° or less.
In other words, the initial contact angle of water with respect to the resist surface of the printed circuit board whose surface is protected by the cured photosensitive solder resist is θ ₁ , and the printed circuit board is immersed in a rinse agent at 30 ° C. for 10 minutes, and then 100 ° C. The absolute value of the difference between the contact angles θ ₂ and θ ₁ | θ ₂ −θ ₁ | is 3 where θ ₂ is the contact angle of water with the resist surface of the printed circuit board dried for 5 minutes under the above conditions. It is preferable that the angle is not more than °.
This is because if the absolute value of the difference in contact angle exceeds 3 °, the adhesion of the resist to the sealing resin or the electrical insulation, and further the mechanical strength may be excessively lowered.
Therefore, the absolute value | θ ₂ −θ ₁ | of the contact angle difference is more preferably 2 ° or less, and further preferably 1 ° or less. The lower limit of the absolute value | θ ₂ −θ ₁ | of the contact angle difference is not particularly limited, and examples thereof include 0 ° or more.

9. Manufacturing method The manufacturing method of the rinse agent which concerns on this embodiment includes the process of mixing components, such as the water-soluble glycol ether compound mentioned above and water. As the mixing step, any method may be used as long as the above-described water-soluble glycol ether compound and water are uniformly mixed. Examples of the mixing step include adding a predetermined component to the flask and stirring and mixing with a magnetic stirrer. Moreover, in a chemical plant etc., you may mix components, such as the water-soluble glycol ether compound mentioned above on an industrial scale, and water.

[Second Embodiment]
The second embodiment is a method of using a rinse agent characterized by having the following steps (1) to (2).
(1) A step of cleaning the flux adhering to the object to be cleaned with a cleaning liquid containing benzyl alcohol and a hydrophobic glycol ether compound or one of them.
(2) The washing object washed in the above step (1) is a rinse agent containing at least a water-soluble glycol ether compound and water, and having a solubility of benzyl alcohol of 10 vol% or more, wherein the water-soluble glycol ether compound 100 A step of rinsing with a rinsing agent in which the blending amount of water is 50 to 1000 parts by weight with respect to parts by weight. That is, the second embodiment is characterized by having steps (1) to (2). It is also a flux cleaning method using the specified cleaning agent and rinse agent.

In another aspect of the second embodiment, the method of using the rinse agent is a method of using the rinse agent including the following steps (1) to (2).
(1) A step of cleaning the flux adhering to the object to be cleaned using a cleaning agent containing benzyl alcohol and a hydrophobic glycol ether compound or one of them (2) The above-described cleaning target cleaned in the above step (1) A rinsing agent containing at least a water-soluble glycol ether compound and water, wherein the solubility of the benzyl alcohol is 10 vol% or more, and the amount of water added is 100 parts by weight of the water-soluble glycol ether compound. Rinsing with a rinse agent that is 50 to 1000 parts by weight

1. Process (1)
Step (1) includes soldered semiconductor elements, for example, semiconductor components such as BGA (ball grid array), CSP (chip size package), PGA (pin grid array), LGA (land grid array), and semiconductor-mounted TAB. (Tape automated bonding) This is a step of cleaning an object to be cleaned such as a tape, a semiconductor-mounted lead frame, a semiconductor-mounted capacitor, a semiconductor-mounted resistor, a semiconductor element substrate using a cleaning agent.
That is, since flux is used for soldering these objects to be cleaned, the flux is attached to the soldered portion.
Such a flux contains rosin as a main component and contains an organic acid salt, a glycidyl ether compound, an oxyacid, a (di) carboxylic acid, and the like.
Moreover, since it solders under heating, the said flux will also contain heat-transformed bodies, such as rosin.
Therefore, since it is very difficult to remove the flux using a water-soluble glycol ether compound, a hydrophobic glycol ether compound or benzyl alcohol is preferably used for removing the flux.

Accordingly, preferred examples of benzyl alcohols to be used (sometimes simply referred to as “benzyl alcohol”) include ethyl benzyl alcohol, methyl benzyl alcohol, benzyl alcohol and the like. It will be used in a combination of two or more.
In the present invention, it is most preferable to use benzyl alcohol.
This is because benzyl alcohol can exhibit excellent detergency even for a relatively short time.

Examples of the hydrophobic glycol ether compound used in the present invention include propylene glycol monobutyl ether (BFG), dipropylene glycol dimethyl ether (DMFDG), dipropylene glycol monobutyl ether (BFDG), dipropylene glycol monopropyl ether (PFDG). ), Diethylene glycol monohexyl ether (HeDG), ethylene glycol monophenyl ether (PhG), diethylene glycol monophenyl ether (PhDG), ethylene glycol monobenzyl ether (BzG), propylene glycol monophenyl ether (PhFG), diethylene glycol dibutyl ether (DBDG) )) Or a combination of two or more. In addition, as a hydrophobic glycol ether compound used here, the thing which shows the hydrophobicity whose solubility (measurement temperature: 20 degreeC) in water is 50 weight% or less is preferable, for example.

Furthermore, in the present invention, benzyl alcohol and a hydrophobic glycol ether compound can be used in combination.
Moreover, other components can also be mix | blended with benzyl alcohol or a hydrophobic glycol ether compound.
In addition, as other components blended in the cleaning agent, at least one of a water-soluble glycol ether compound, an amine compound, an antioxidant, an antistatic agent, a surfactant, a rust inhibitor, a viscosity modifier, and the like can be given. be able to.

2. Step (2)
Step (2) is a step of rinsing the object to be cleaned, which has been cleaned using a predetermined cleaning agent in step (1), using a predetermined rinsing agent.
And in process (2), by using the rinse agent demonstrated in 1st Embodiment, the solubility of benzyl alcohol etc. which were used in the washing | cleaning process of process (1) can be adjusted to a high value with 10 vol% or more. it can.
Therefore, even if a relatively large amount of benzyl alcohol flows into the rinsing agent in step (2) due to the specific cleaning agent in step (1), the rinsing agent remains between room temperature and 80 ° C. Phase separation does not occur, turbidity does not decrease, and predetermined transparency can be maintained.

Moreover, the rinse agent used by this invention can maintain the solubility of benzyl alcohol to 10 vol% or more by mix | blending a specific amount of water with a water-soluble glycol ether compound as mentioned above.
Therefore, due to the cleaning agent, benzyl alcohol or hydrophobic glycol ether compound mixed in the rinse agent can be easily compatible.
Moreover, according to the rinse agent of the present invention, the re-adhesion of the flux dissolved in the cleaning agent can be effectively suppressed, and the function as a cleaning liquid is also exhibited, so that an object to be cleaned having a very high cleanliness can be obtained. it can.

3. Drying step After performing the rinse treatment (step (2)), it is preferable to carry out a step of drying the object to be cleaned.
Such drying conditions can be set as appropriate, but the drying temperature is usually preferably in the range of 60 to 120 ° C., more preferably in the range of 80 to 100 ° C.
Then, at a drying temperature within this range, drying is usually performed by blowing hot air for 1 to 20 minutes, preferably 5 to 10 minutes.
The reason why the drying can be performed in such a short time is that the rinsing agent of the present invention is made into an aqueous system, and although a boiling point is relatively high, a configuration in which a small amount of a predetermined glycol ether is added is adopted.
Therefore, by drying as described above, the blending component of the rinsing agent is almost completely removed, and most of the surplus components remain on the surface of the object to be cleaned other than the components intended to remain such as a rust inhibitor. It will be in a state that does not.

EXAMPLES Next, the present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited thereto.
In addition, the name of the compound used for comprising the rinse agent of an Example, its symbol, and its physical property are described in the following table.

[Example 1]
1. Process (1)
Microcleaner MC3USHD-1.5E (manufactured by Kaken Tech Co., Ltd.) was used as a cleaning device, and benzyl alcohol was accommodated as a cleaning solution in the cleaning tank.
Next, the cleaning apparatus was operated to clean the substrate with a semiconductor element as an object to be cleaned.
That is, the object to be cleaned was immersed in benzyl alcohol, which is a cleaning liquid stored in a cleaning tank, and ultrasonic cleaning was performed at 70 ° C. for 5 minutes.

2. Step (2)
Subsequently, the to-be-cleaned object wash | cleaned in the washing tank was moved to the rinse tank using the conveying apparatus.
That is, in the rinse tank which accommodated the rinse liquid, the immersion process with respect to the rinse agent was performed with respect to the to-be-washed object on the conditions for 5 minutes at 30 degreeC, and also the rinse process was performed. Table 2 shows the composition and characteristics of this rinse agent.
The rinsing tank in which the rinsing agent was stored was provided with a predetermined distillation apparatus, and the rinsing liquid was distilled to separate the compatible benzyl alcohol.

3. Drying Step The object to be cleaned that had been rinsed as described above was taken out of the rinsing tank and dried with hot air under drying conditions at 100 ° C. for 5 minutes.
As a result, it was visually confirmed that the rinse agent and the like were completely removed from the surface of the object to be cleaned.

4). Physical property evaluation (1)
(1) Measuring method of solubility of benzyl alcohol 100 ml of rinsing agent is weighed into a measuring cylinder having a capacity of 200 ml. 1 ml of benzyl alcohol is added dropwise thereto and stirred. If the solution is homogeneous and transparent by stirring, 1 ml of benzyl alcohol is again added dropwise and stirred.
Then, repeating the above dropping and stirring, measuring the total volume (ml) of the dropped benzyl alcohol at the time of clouding / separation after stirring, and finally, how many ml of benzyl alcohol is dissolved in the rinse agent Was measured.
Then, the amount of benzyl alcohol dissolved (vol%) was calculated and used as the solubility of benzyl alcohol in the rinse agent.

(2) Rinse (Rinse) Evaluation Method Each 200 g of benzyl alcohol and a rinse agent were accommodated in a beaker having a capacity of 300 ml. Thereafter, the temperature of benzyl alcohol was maintained at 60 ° C, and the temperature of the rinse agent was maintained at 30 ° C.
Next, the glass epoxy substrate was housed in a beaker containing benzyl alcohol, and in that state, the magnetic stirrer in the beaker containing benzyl alcohol was rotated and immersed for 10 minutes.
Next, after stopping the rotation of the magnetic stirrer and taking out the glass epoxy substrate from the benzyl alcohol, the glass epoxy substrate is accommodated in the beaker containing the rinse agent, and in that state, the magnetic in the beaker containing the rinse agent is contained. The stirrer was rotated and immersed for a predetermined time.
Next, the rotation of the magnetic stirrer was stopped, the glass epoxy substrate was taken out from the rinse agent, and drying was performed for 10 minutes using a circulation oven maintained at 100 ° C.
Thereafter, the dried glass epoxy substrate was taken out from the circulation oven, visually observed on the surface, and rinsed (rinsed) of the rinse agent was evaluated in light of the following criteria.
A: No benzyl alcohol remaining after rinsing time of 5 minutes.
A ': No benzyl alcohol remaining in the rinse time of 7 minutes.
B: No benzyl alcohol remaining after rinsing time of 10 minutes.
C: There is a little liquid residue of benzyl alcohol after a rinsing time of 10 minutes.
D: There is a lot of liquid residue of benzyl alcohol after a rinsing time of 10 minutes.
E: There is much liquid residue of benzyl alcohol after rinsing time of 15 minutes.

(3) Drying Evaluation Method After rinsing 200 g in a 300 ml capacity beaker, the temperature was maintained at 30 ° C.
Next, the glass epoxy substrate was accommodated in a beaker containing 200 g of a rinse agent, and in that state, the magnetic stirrer in the beaker was rotated and immersed for 10 minutes. Next, the rotation of the magnetic stirrer was stopped, the glass epoxy substrate was taken out of the rinse agent, and drying was performed for a predetermined time using a circulation oven maintained at 100 ° C. Then, the dried glass epoxy board | substrate was taken out from the circulation oven, the surface was observed visually, and the dryness evaluation of the rinse agent was performed in light of the following references | standards.
A: It can be dried within 5 minutes.
A ′: Drying is possible within 7 minutes.
B: Drying is possible within 10 minutes.
C: There is a little liquid residue after drying for 10 minutes.
D: There is a lot of liquid residue after drying for 10 minutes.

(4) Measuring method of contact angle of ion-exchanged water A printed wiring board whose surface was protected by a photosensitive solder resist (SR series manufactured by Hitachi Chemical Co., Ltd.) was used as a contact angle measurement standard sample. Contact with ion-exchanged water on the surface of the solder resist before washing and the resist surface that has been rinsed with various rinsing agents under conditions of 30 ° C / 10 minutes of stirring and then dried under conditions of hot air 100 ° C / 5 minutes The change in angle (| θ ₂ −θ ₁ |) was measured. Here, θ ₁ represents the contact angle (initial contact angle) of ion-exchanged water with respect to the surface of the solder resist before cleaning, and θ ₂ represents the contact angle of ion-exchanged water with respect to the resist surface subjected to the rinsing process and the drying process described above. Indicates.

(5) Measuring method of cloud point Set the liquid temperature of the sample (rinse agent) to 20 ° C., gradually increase the temperature while measuring the appearance, and the temperature when the sample starts to become cloudy or separated is taken as the cloud point. .
However, such a cloud point is preferably absent at least in the temperature range of room temperature to 80 ° C.
That is, in such a use temperature range (from room temperature to 80 ° C.), since it has no cloud point and maintains transparency, it is possible to provide a rinse agent with good usability.
Therefore, it is practically convenient to have transparency in such a predetermined temperature range and not to cause phase separation in the temperature range from room temperature to 80 ° C. by having a predetermined light transmittance. is there.
In Tables 2 to 4, which will be described later, the evaluation of “None” for the cloud point means that the rinse agent was not clouded or separated in the range of 20 ° C. to 80 ° C.

(6) Turbidity measurement method, flux re-adhesion evaluation Using a commercially available post-flux (model number: Sparkle Flux PO-Z-7 (manufactured by Senjo Metal Industry Co., Ltd.)), the solvent component is extracted from the post-flux. After the distillation, the collected solid residue (flux) was used as a sample.
And the flux was added so that it might become 3 weight% with respect to benzyl alcohol.
The flux-mixed benzyl alcohol solution thus obtained was added to each rinse agent in an amount of 1% by weight, and the turbidity was measured using a water quality meter WA-1 (manufactured by Nippon Denshoku Industries Co., Ltd.). This turbidity was used as an index of flux reattachment. It can be said that the closer the turbidity is to 0, the clearer, more uniform and less likely to reattach.

(7) Measuring method of flash point The flash point of the rinse agent was measured according to JIS K2265-1 and 4 (how to determine the flash point).
In addition, although it is preferable not to have a flash point, even if it exists, it is preferable that it is the temperature of 50 degreeC or more. Here, “having no flash point” means that there is no flash point in the range from room temperature to the boiling point of the rinse agent.

[Example 2]
In Example 2, the object to be cleaned was treated in the same manner except that the same amount of ETB was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 3]
In Example 3, the object to be cleaned was treated in the same manner except that the same amount of MMB was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 4]
In Example 4, the object to be cleaned was treated in the same manner except that the same amount of iPG was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 5]
In Example 5, the object to be cleaned was treated in the same manner except that the same amount of DPM was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 6]
In Example 6, the object to be cleaned was treated in the same manner except that the same amount of MEDG was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 7]
In Example 7, the object to be cleaned was treated in the same manner except that the same amount of DMTG was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 8]
In Example 8, the object to be cleaned was treated in the same manner except that the same amount of DMDG was used instead of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. The obtained results are shown in Table 2.

[Example 9]
In Example 9, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, the amount of PS used was 20 parts by weight and the amount of water was 80 parts by weight. The object to be cleaned was treated in the same manner except that it was changed. The obtained results are shown in Table 2.

[Example 10]
In Example 10, it was cleaned in the same manner except that 15 parts by weight of PS and 15 parts by weight of MMB were used instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1. The product was processed. The obtained results are shown in Table 2.

[Example 11]
In Example 11, 15 parts by weight of PS and 15 parts by weight of MMB were used in place of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, and 1 part by weight of TMHMDA was used as the amine compound. The object to be cleaned was treated in the same manner except that it was used and the amount of water was changed to 69 parts by weight. The obtained results are shown in Table 2.

[Example 12]
In Example 12, 15 parts by weight of PS and 15 parts by weight of MMB were used in place of the ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, and 0.5 parts by weight of DBA was used as the amine compound. The object to be cleaned was treated in the same manner except that 0.5 parts by weight of DEHA was used and the amount of water was changed to 69 parts by weight. The obtained results are shown in Table 2.

[Example 13]
In Example 13, 20 parts by weight of PS and 20 parts by weight of MMB were used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, and the amount of water was further changed to 60 parts. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 2.

[Example 14]
In Example 14, 30 parts by weight of ETB was used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, and 1 part by weight of TMHMDA was used as an amine compound. Further, the object to be cleaned was treated in the same manner except that the amount of water was changed to 69 parts by weight. The obtained results are shown in Table 2.

[Example 15]
In Example 15, 30 parts by weight of DPM was used instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, and 0.5 weight of DBA was added as an amine compound. And 0.5 parts by weight of DEHA were used, and further, the object to be cleaned was treated in the same manner except that the amount of water was changed to 69 parts by weight. The obtained results are shown in Table 2.

[Example 16]
In Example 16, 30 parts by weight of PS and 5 parts by weight of DPM were used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, and the amount of water was 65%. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Example 17]
In Example 17, 10 parts by weight of PS and 30 parts by weight of DMTG were used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, and the amount of water was further changed to 60 parts. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Example 18]
In Example 18, it was cleaned in the same manner except that 10 parts by weight of ETB and 20 parts by weight of MMB were used instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1. The product was processed. The obtained results are shown in Table 3.

[Example 19]
In Example 19, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 10 parts by weight of ETB and 15 parts by weight of DPM were used, and the amount of water was 75%. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Example 20]
In Example 20, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 25 parts by weight of MMB and 15 parts by weight of DPM were used. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Example 21]
In Example 21, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, 15 parts by weight of MMB and 20 parts by weight of DMTG were used, and TMHMDA was added as an amine compound. The objects to be cleaned were treated in the same manner except that parts by weight were used and the amount of water was changed to 64 parts by weight. The obtained results are shown in Table 3.

[Example 22]
In Example 22, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, 15 parts by weight of PS and 15 parts by weight of MMB were used, and TMDAP was added as an amine compound. The objects to be cleaned were treated in the same manner except that parts by weight were used and the amount of water was changed to 69 parts by weight. The obtained results are shown in Table 3.

[Example 23]
In Example 23, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 15 parts by weight of PS and 15 parts by weight of 3MB were used. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Example 24]
In Example 24, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 20 parts by weight of PS and 20 parts by weight of IPDM were used, and the amount of water was changed to 60 parts. The object to be cleaned was treated in the same manner except that the parts were changed to parts by weight. The obtained results are shown in Table 3.

[Comparative Example 1]
In Comparative Example 1, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, the amount of PS used was changed to 80 parts by weight, and the amount of water used was changed. The object to be cleaned was treated in the same manner except that the amount was changed to 20 parts by weight. Table 4 shows the obtained results.

[Comparative Example 2]
In Comparative Example 2, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 15 parts by weight of PS and 3 parts by weight of BFG were used. The object to be cleaned was treated in the same manner except that the amount of water used was changed to 82 parts by weight. Table 4 shows the obtained results.

[Comparative Example 3]
In Comparative Example 3, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1, 40 parts by weight of BFG was used and the amount of water was 60 parts by weight. The object to be cleaned was treated in the same manner except that it was changed. Table 4 shows the obtained results.

[Comparative Example 4]
In Comparative Example 4, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 25 parts by weight of DMFDG was used and the amount of water was changed to 75 parts by weight. Except for the above, the object to be cleaned was treated in the same manner. Table 4 shows the obtained results.

[Comparative Example 5]
In Comparative Example 5, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 20 parts by weight of DMFDG and 10 parts by weight of MMB were used. The object to be cleaned was treated in the same manner except that 1 part by weight of MEM was used as the compound and the amount of water was changed to 69 parts by weight. Table 4 shows the obtained results.

[Comparative Example 6]
In Comparative Example 6, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, 30 parts by weight of DEDG was used. Processed. Table 4 shows the obtained results.

[Comparative Example 7]
In Comparative Example 7, the object to be cleaned was similarly prepared except that 30 parts by weight of iBG was used instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in Step (2) of Example 1. Processed. Table 4 shows the obtained results.

[Comparative Example 8]
In Example 1, instead of using 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2), 60 parts by weight of ethanol was used and the amount of water was changed to 40 parts by weight. In the same manner, the object to be cleaned was processed. Table 4 shows the obtained results.

5. Physical property evaluation (2)
(1) Measuring method of light transmittance The light transmittance of the rinse agents of Examples 1 to 24 and Comparative Examples 1 to 8 was measured by the following method. First, 200 g of the rinse agent was accommodated in a 300 ml capacity beaker. Subsequently, it maintained at predetermined | prescribed temperature (20, 40, or 80 degreeC), the stirrer in a beaker was rotated using the magnetic stirrer, and the rinse agent was stirred. The rinse agent after stirring was immediately accommodated in a spectrophotometer cell, and the light transmittance was measured under the following conditions. Table 5 shows the measurement results. From the results in Table 5, it was confirmed that the rinse agents of Examples 1 to 24 had a light transmittance of 90% or more in the temperature range from room temperature to 80 ° C.
Spectrophotometer: UV-visible spectrophotometer V-530 (manufactured by JASCO Corporation)
Measurement wavelength: Visible light (660 nm)

As described above, according to the present invention, the ratio between the blending amount of the water-soluble glycol ether compound and the blending amount of water is set to a value within a predetermined range, and the solubility of benzyl alcohol is set to a predetermined value or more. As a result, environmental safety (for example, work environment safety) can be remarkably improved. Further, according to the present invention, not only the conventional water-soluble glycol ether compound but also the rinsing property and the drying property with respect to the object to be cleaned by a hydrophobic solvent such as benzyl alcohol and hydrophobic glycol ether compound can be improved. became.

In addition, according to the present invention, the rinsing property after cleaning is excellent, and the cleaning property and the anti-reattachment property of the flux are also improved. Therefore, both the rinse agent and the cleaning agent can be used for both purposes. It has become possible.

Furthermore, since the present invention is a method of using a predetermined rinse agent, after the object to be cleaned is efficiently cleaned using the predetermined cleaning agent, environmental safety (for example, work environment safety) and reproducibility In addition, it is possible to efficiently obtain an object to be cleaned with little residual cleaning agent.
Therefore, according to the rinsing agent of the present invention and the method of using the same, it is highly expected that the object to be cleaned is cleaned and rinsed safely and efficiently at a low cost.

Although the embodiments and examples of the present invention have been described as described above, it is also planned from the beginning to appropriately combine the configurations of the above-described embodiments and examples.

It should be considered that the embodiments and examples disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is shown not by the above-described embodiments and examples but by the scope of claims, and is intended to include meanings equivalent to the scope of claims and all modifications within the scope.

Claims

A rinse agent comprising at least a water-soluble glycol ether compound and water, and having a solubility of benzyl alcohol of 10 vol% or more,
A rinse agent in which the water content is 50 to 1000 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound.
The rinse agent according to claim 1, wherein the light transmittance in a temperature range from room temperature to 80 ° C is 90% or more.
The rinse agent of Claim 1 or 2 whose flash point is 50 degreeC or more.
The initial contact angle of water with respect to the surface of the printed circuit board whose surface is protected by a cured photosensitive solder resist is θ 1 ,
When the contact angle of water with respect to the surface of the printed circuit board, which was dried at 100 ° C. for 5 minutes, was immersed in a rinse agent at 30 ° C. for 10 minutes, and θ 2 ,
The rinse agent according to any one of claims 1 to 3, wherein an absolute value | θ 2 -θ 1 | of a difference between the contact angles θ 2 and θ 1 is 3 ° or less.
The rinsing agent according to any one of claims 1 to 4, wherein the water-soluble glycol ether compound has a boiling point of 250 ° C or lower.
The water-soluble glycol ether compound includes ethylene glycol monopropyl ether, ethylene glycol mono-tert-butyl ether, 3-methoxy-3-methylbutanol, 3-methoxybutanol, ethylene glycol monoisopropyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol The rinsing agent according to any one of claims 1 to 5, which is at least one compound selected from the group consisting of monomethyl ether, diethylene glycol ethyl methyl ether, triethylene glycol dimethyl ether, and diethylene glycol dimethyl ether.
An amine compound having a boiling point of 250 ° C. or lower,
The rinse agent according to any one of claims 1 to 6, wherein the compounding amount of the amine compound is 0.1 to 10 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound.
A method of using a rinse agent comprising the following steps (1) to (2).
(1) A step of cleaning the flux adhering to an object to be cleaned using a cleaning agent containing benzyl alcohol and a hydrophobic glycol ether compound or one of them (2) The target to be cleaned cleaned in the step (1) A rinsing agent containing at least a water-soluble glycol ether compound and water, wherein the solubility of the benzyl alcohol is 10 vol% or more, and the amount of the water is 100 parts by weight of the water-soluble glycol ether compound. Rinsing with a rinse agent that is 50 to 1000 parts by weight