阅读说明：本技术 漂洗剂以及漂洗剂的使用方法 (Rinse agent and method for using rinse agent ) 是由 堀薰夫 赤松悠纪 于 2019-01-31 设计创作，主要内容包括：本发明提供一种漂洗剂,其是至少含有水溶性二醇醚化合物和水,苄醇的溶解度为10vol％以上的漂洗剂,其中,相对于上述水溶性二醇醚化合物100重量份,上述水的配合量为50～1000重量份。(The present invention provides rinsing agents comprising at least a water-soluble glycol ether compound and water, wherein the solubility of benzyl alcohol is 10 vol% or more, and the amount of water is 50 to 1000 parts by weight based on 100 parts by weight of the water-soluble glycol ether compound.)

1, rinsing agents comprising at least a water-soluble glycol ether compound and water, wherein the solubility of benzyl alcohol is 10 vol% or more,

the amount of water is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

2. The rinse agent according to claim 1, having a light transmittance of 90% or more in a temperature range of room temperature to 80 ℃.

3. The rinse agent according to claim 1 or 2, which has a flash point of 50 ℃ or higher.

4. The rinse agent according to any of claims 1 to 3, wherein,

the initial contact angle of water with respect to the surface of the printed substrate whose surface is protected by the cured photosensitive solder resist is represented by θ₁，

Immersing the printed substrate in a 30 ℃ rinse agent for 10 minutes, drying the printed substrate at 100 ℃ for 5 minutes, and defining a contact angle of water with respect to the surface of the dried printed substrate as θ₂，

At this time, the contact angle θ₂And theta₁Absolute value of the difference | θ₂－θ₁And | is 3 ° or less.

5. The rinse agent according to any of claims 1 to 4, wherein,

the boiling point of the water-soluble glycol ether compound is 250 ℃ or lower.

6. The rinse agent according to any of claims 1 to 5, wherein,

the water-soluble glycol ether compound is at least compounds selected from the group consisting of ethylene glycol monopropyl ether, 3-methoxy-3-methyl butanol, 3-methoxy butanol, ethylene glycol monoisopropyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol monomethyl ether, diethylene glycol ethyl methyl ether, triethylene glycol dimethyl ether, and diethylene glycol dimethyl ether.

7. The rinse agent according to any of claims 1 to 6, wherein,

further contains an amine compound having a boiling point of 250 ℃ or lower,

the amine compound is incorporated in an amount of 0.1 to 10 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

8, a method for using kinds of rinse agents, comprising the following steps (1) to (2):

a step (1) of cleaning a flux adhering to an object to be cleaned with a cleaning agent containing either a benzyl alcohol or a hydrophobic glycol ether compound or a benzyl alcohol or a hydrophobic glycol ether compound;

and (2) rinsing the object to be cleaned in the step (1) with a rinsing agent, wherein the rinsing agent contains at least a water-soluble glycol ether compound and water, and the solubility of the benzyl alcohol is 10 vol% or more, and the amount of water is 50 to 1000 parts by weight based on 100 parts by weight of the water-soluble glycol ether compound.

Technical Field

The present invention relates to kinds of rinse agents and methods of using rinse agents, and more particularly, to kinds of rinse agents which are excellent in environmental safety (e.g., work environment safety) by containing a predetermined amount of water and which can exhibit excellent rinsing performance after washing an object to be washed with a specific cleaning agent (e.g., benzyl alcohol) and kinds of rinse agents and methods of using such rinse agents.

Background

After the electronic component as a cleaning object is bonded to the electrode of the printed wiring board using solder paste (solder paste), widely uses an industrial cleaning agent, for example, a cleaning agent for flux, in order to remove flux (flux) and flux residue.

Therefore, a cleaning agent for flux comprising a glycol-based cleaning agent containing various glycol-based compounds as a main component is used because of the low level of the cleaning property and environmental problems.

Disclosure of Invention

Problems to be solved by the invention

detergent compositions for lead-free solder flux removal are disclosed, which contain a non-halogen organic solvent (A) represented by a specific structural formula, an amine compound (B) represented by a specific structural formula, a chelating agent (C) containing no amino group, and, if necessary, a predetermined amount of water (see, for example, WO2009/020199 (patent document 1)).

Further, kinds of cleaning methods have been disclosed, which comprise a rinsing step in which water of 5 to 100 ℃ is used after a cleaning step is carried out using a cleaning agent composition containing a nonionic surfactant and/or a hydrocarbon compound (see, for example, japanese patent laid-open No. 7-080423 (patent document 2)).

Further, -type substrate cleaning treatment methods have been disclosed, in which a substrate to which rosin-based solder flux has adhered is brought into contact with a cleaning agent containing a specific glycol ether compound, the flux is cleaned and removed from the substrate, and then the substrate is brought into contact with a lower alcohol or an aqueous solution thereof as a rinsing agent (see, for example, japanese patent application laid-open No. 5-175641 (patent document 3)).

However, the cleaning agent for flux disclosed in patent document 1 has a problem that it is difficult to dry the cleaning agent itself in a short time because it generally has a high boiling point. Moreover, the cleaning agent for flux has been found to have a problem that the cleanliness of the object to be cleaned is liable to be lowered.

Therefore, the following problems were found: it is necessary to provide a process of replacing the flux cleaning agent with a rinsing agent such as water and aqueous alcohol and drying the object to be cleaned.

Further, in the case of the cleaning method disclosed in patent document 2, there is a problem that the kind of the cleaning agent composition is excessively limited. Moreover, the following problems have been found: in this cleaning method, the water temperature in the rinsing step must be strictly controlled to a value within a predetermined range (5 to 100 ℃).

Also, the following problems have been found: when water is used as the rinsing agent, the drying property is poor, and the solubility to a hydrophobic flux cleaning agent, for example, benzyl alcohol, is low, so that poor rinsing is likely to occur.

In the case of the substrate cleaning method disclosed in patent document 3, since aqueous alcohol is used as a rinsing agent, the solubility of the cleaning agent for hydrophobic flux is relatively good. However, the rinse agent has a low flash point, and thus has a problem of insufficient environmental safety (e.g., working environment safety).

Therefore, the inventors of the present invention conducted intensive studies and, as a result, found that: the conventional problems are solved by using a rinsing agent in which the ratio of the amount of water-soluble glycol ether compound to the amount of water is a predetermined ratio, and by setting the solubility of benzyl alcohol in the rinsing agent to a predetermined value or more.

That is, an object of the present invention is to provide kinds of aqueous rinsing agents which are used after cleaning an object to be cleaned with a specific hydrophobic cleaning agent (e.g., benzyl alcohol) and which are excellent in environmental safety (e.g., work environment safety) and which can exhibit excellent rinsing performance, and a method of using such rinsing agents.

Means for solving the problems

The present invention provides rinsing agents containing at least a water-soluble glycol ether compound and water, wherein the solubility of benzyl alcohol is 10 vol% or more, and the amount of water is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

The present invention is a rinse agent which has excellent environmental safety (e.g., working environment safety) and in which the ratio of the amount of water-soluble glycol ether compound to the amount of water is within a predetermined range.

Furthermore, by setting the solubility of benzyl alcohol per unit volume of the rinsing agent to a predetermined value or more, various cleaning agents can be rinsed, including hydrophobic compounds such as benzyl alcohol, which have been difficult to rinse with water in the past. Therefore, a rinsing agent with a very small amount of residual cleaning agent in the object to be cleaned can be provided.

In addition, in constituting the rinse agent of the present invention, it is preferable that the light transmittance in a temperature range of room temperature to 80 ℃ is 90% or more.

By having a predetermined light transmittance within a predetermined temperature range in this way, it can be determined that: no phase separation occurs in the temperature range from room temperature to 80 c and virtually no cloud point is present. Therefore, the rinse agent does not have a cloud point in a normal use temperature range, and can maintain transparency, thereby providing a rinse agent which is convenient to use.

In the case of constituting the rinse agent of the present invention, the flash point of the rinse agent is preferably 50 ℃ or higher.

By setting the temperature to a value equal to or higher than the predetermined temperature even when the flash point is present, it is possible to provide a rinsing agent having more excellent environmental safety (e.g., work environment safety).

In the case of forming the rinse agent of the present invention, it is preferable that the initial contact angle of water with respect to the solder resist surface of the printed circuit board whose surface is protected by the cured photosensitive solder resist is θ₁The printed circuit board was immersed in a 30 ℃ rinse agent for 10 minutes, then dried at 100 ℃ for 5 minutes, and the contact angle of water with respect to the solder resist surface of the dried printed circuit board was defined as θ₂At this time, | θ₂－θ₁And | is 3 ° or less.

By providing the absolute value of the difference between the predetermined contact angles in this manner, it is possible to quantitatively supply the rinsing agent with less adverse effect on the object to be cleaned such as the printed board.

In the case of constituting the rinse agent of the present invention, the boiling point (atmospheric pressure) of the water-soluble glycol ether compound is preferably 250 ℃ or lower.

By limiting the boiling point of the water-soluble glycol ether compound in this way, the rinse agent can be more easily regenerated, and the drying property is more excellent.

In addition, in the case of constituting the rinse agent of the present invention, it is preferable that the water-soluble glycol ether compound is at least compounds selected from the group consisting of ethylene glycol monopropyl ether, 3-methoxy-3-methyl butanol, 3-methoxy butanol, ethylene glycol monoisopropyl 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, a rinsing agent which is excellent in environmental safety (e.g., working environment safety), has a small residue of a cleaning agent, and is relatively inexpensive can be provided.

In addition, in the case of constituting the rinse agent of the present invention, it is preferable that the rinse agent further contains an amine compound having a boiling point of 250 ℃ or lower, and the amount of the amine compound is 0.1 to 10 parts by weight based on 100 parts by weight of the water-soluble glycol ether compound.

By thus blending a predetermined amount of an amine compound having a predetermined boiling point, the following rinse agent can be provided: the rinse agent can be more easily regenerated while improving compatibility with flux residue contained in the cleaning agent, and the object to be cleaned such as a printed board can be efficiently cleaned with the rinse agent having less adverse effect on the object to be cleaned.

Another of the present invention is a method for using kinds of rinse agents, which is characterized by comprising the following steps (1) to (2).

And (1) cleaning the flux adhering to the object with a cleaning liquid containing of either benzyl alcohol or a hydrophobic glycol ether compound or both.

And (2) rinsing the object to be cleaned in the step (1) with a rinsing agent, wherein the rinsing agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, and the amount of water added is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

By using a rinsing agent in which the ratio of the amount of water-soluble glycol ether compound to the amount of water is within a predetermined range and the solubility of benzyl alcohol is at least a predetermined value, a rinsing treatment with excellent environmental safety (e.g., working environment safety) can be performed even after an object to be cleaned is efficiently cleaned with a predetermined cleaning agent.

Further, even when a predetermined cleaning agent is used in the cleaning step, the following rinsing agent can be used to perform the rinsing treatment: various cleaning agents can be washed out, including hydrophobic compounds such as benzyl alcohol, which have been difficult to wash out with water in the past, and the specified cleaning agents have very little residue in the objects to be cleaned.

Effects of the invention

According to the present invention, kinds of aqueous rinsing agents which are used after cleaning an object to be cleaned with a specific hydrophobic cleaning agent (e.g., benzyl alcohol) and are excellent in environmental safety (e.g., work environment safety) and which can exhibit excellent rinsing performance, and a method for using such rinsing agents can be provided.

Drawings

Fig. 1 is a graph provided for explaining the relationship between the solubility (vol%) of benzyl alcohol and the evaluation fraction (relative value) of compatibility (washability) per unit volume (100ml) of the rinsing agent.

Detailed Description

[ th embodiment ]

Embodiment is the rinsing agent characterized by containing at least a water-soluble glycol ether compound and water, and by having a solubility of benzyl alcohol of 10 vol% or more, wherein the amount of water blended is in 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 rinsing agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, wherein the amount of water added is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

In the present specification, the expression "a to B" means the upper limit or lower limit of the range (i.e., a to B), and when no unit is described in a and only a unit is described in B, the unit of a is the same as the unit of B.

1. Water-soluble glycol ether compound

Here, the "glycol ether compound" means a compound in which or both of the hydroxyl groups of the glycol or its condensate are etherified.

The glycol ether compound constituting the rinse agent of the present invention is a water-soluble glycol ether compound, unlike the glycol ether compound (hydrophobic glycol ether compound contained in the cleaning liquid) used in the step (1)) described above.

This is because: by using the water-soluble glycol ether compound, suspension or separation does not occur even when 100ml of the water-soluble glycol ether compound is dissolved in 100 parts by weight of water.

And, because: the method can remove the hydrophobic benzyl alcohol or hydrophobic glycol ether compound remained in the object to be cleaned and rinse the object to be cleaned efficiently.

The water-soluble glycol ether compound used herein is preferably a water-soluble glycol ether compound having a solubility in water (measurement temperature: 20 ℃) of more than 50% by weight.

The boiling point (atmospheric pressure) of the water-soluble glycol ether compound used in the present invention is preferably 250 ℃. That is, the boiling point (atmospheric pressure) of the water-soluble glycol ether compound is preferably 250 ℃ or lower. In the present embodiment, "atmospheric pressure" is 1013.25 hPa.

This is because: by using a water-soluble glycol ether compound having such a boiling point, the rinse agent can be regenerated more easily, and the obtained rinse agent is not flammable and is more excellent in environmental safety (for example, working environment safety).

Therefore, it is preferable for the rinsing agent of the present invention to be 50 ℃ or higher or to have no flash point even in the case of having a flash point.

That is, during the operation of the washing apparatus, the washing operation including the rinsing step in which the risk of ignition of the rinsing agent is eliminated and which is very stable can be performed.

Accordingly, the boiling point of the water-soluble glycol ether compound is more preferably set to a value within the range of 120 to 230 ℃, and further preferably set to a value within the range of 140 to 220 ℃ in the step .

Specific examples of such water-soluble glycol ether compounds include at least compounds selected from the group consisting of ethylene glycol monopropyl ether (PS), ethylene glycol monopropyl 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 glycol dimethyl ether (DMTG), and diethylene glycol dimethyl ether (DMDG).

As combinations of plural kinds of the above water-soluble glycol ethers, for example, 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 and DMTG.

In aspects of the present embodiment, the water-soluble glycol ether compound may be a compound having a structure represented by formula 1, formula 2, or formula 3 below.

HO－[C₃H₆－O]₂－R¹(formula 1)

R²－O－[(CH₂)₂－O]₃－R³(formula 2)

CH₃－CR⁴R⁵－CR⁶R⁷－CH₂-OH (formula 3)

(in formula 1, R¹Represents an alkyl group having 1 to 3 carbon atoms. In the formula 2, R²Represents an alkyl group having 1 or 2 carbon atoms, R³Represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms. In the formula 3, R⁴And R⁶Wherein the side represents a hydrogen atom, and the side represents an alkoxy group having 1 or 2 carbon atoms, wherein R in the formula 3⁵And R⁷Wherein the th formula represents a hydrogen atom, and the th formula represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms.)

In formula 1, as represented by- [ C ]₃H₆－O]₂Examples of the group represented by-are: from- [ (CH)₂)₃－O]₂A group represented by- [ CH ]₂CH(CH₃)－O]₂A group represented by- [ CH (CH) ]₃)CH₂－O]₂-a group represented by (a). In this embodiment, the group of formula 1 is represented by- [ C ]₃H₆－O]₂The group represented by- [ CH ] is preferably represented by₂CH(CH₃)－O]₂-a group represented by (a).

Among these water-soluble glycol ether compounds, ethylene glycol monopropyl ether, ethylene glycol mono-t-butyl ether, 3-methoxy-3-methylbutanol, dipropylene glycol monomethyl ether, triethylene glycol dimethyl ether, and the like are more preferable as the water-soluble glycol ether compound from the viewpoint of safety, compatibility with a hydrophobic compound (rinsing property), and drying property.

2. Water (W)

The rinsing agent is characterized in that the amount of water is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound. In other words, the amount of water is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

This is because: if the amount of water is too small, the flammability of the resulting rinse agent may be improved, or adverse effects (change in contact angle) may be exerted on the solder resist.

In addition, , the reason is that when the amount of water added is too large, the rinsing performance of the rinsing agent and the prevention of the reattachment of flux may be remarkably reduced.

Therefore, in the case of forming the rinsing agent, the amount of water to be added is preferably in the range of 80 to 600 parts by weight, more preferably 100 to 400 parts by weight in the step , per 100 parts by weight of the water-soluble glycol ether compound, in other words, the amount of water to be added is preferably 80 to 600 parts by weight, and more preferably 100 to 400 parts by weight in the step , per 100 parts by weight of the water-soluble glycol ether compound.

The water to be added to the water-soluble glycol ether compound is preferably pure water (ion-exchanged water, distilled water, or the like), and preferably has a cleaning property with an electrical conductivity of about 10 μ S/cm, and more preferably has a cleaning property with an electrical conductivity of about 1 μ S/cm. In other words, the conductivity of the water is preferably 1 to 10. mu.S/cm, more preferably 1 to 5. mu.S/cm.

3. Solubility in water

Further, the characteristic of the rinsing agent is characterized in that the solubility of benzyl alcohol per unit volume (100ml) of the rinsing agent is set to a value of 10 vol% or more. In other words, the solubility of benzyl alcohol per unit volume (100ml) of the rinsing agent is 10 vol% or more.

That is, the rinsing agent used in the present invention has the above-described configuration because it rinses an object to be cleaned to which a specific cleaning agent, for example, benzyl alcohol or a hydrophobic glycol ether compound adheres even when the cleaning agent is used.

Here, the solubility of benzyl alcohol is used as an index because: among benzyl alcohol and hydrophobic glycol ether compounds, benzyl alcohol is the most soluble in the rinse agent.

Furthermore, this is because: when the solubility of benzyl alcohol is 10 vol% or more per unit volume (100ml) of the rinsing agent, the change in turbidity value during washing can be greatly reduced, and the state of the rinsing agent rich in transparency can be maintained.

However, if the solubility of benzyl alcohol per unit volume (100ml) of the rinsing agent is too high, the type of water-soluble glycol ether compound that can be used may be excessively limited.

Therefore, the solubility of benzyl alcohol per unit volume (100ml) of the rinsing agent is preferably set to a value within a range of 15 vol% to 40 vol%, and further, the solubility of benzyl alcohol per unit volume () is preferably set to a value within a range of 20 vol% to 30 vol%.

Here, referring to fig. 1, a relationship between solubility (vol%) of benzyl alcohol and evaluation fraction (relative value) of compatibility (washability, or rinsing property) with respect to a unit volume (100ml) of a rinsing agent will be described.

That is, in fig. 1, the horizontal axis represents the solubility (vol%) of benzyl alcohol per unit volume of the rinse agent, and the vertical axis represents the evaluation fraction (relative value) of compatibility (washability or rinsing property). Here, the evaluation scores 0, 1, 2, 3, 4 and 5 on the vertical axis correspond to evaluation E, D, C, B, A' and a of the bleaching property in the examples described later, respectively.

Further, as judged from the characteristic curve in fig. 1, the evaluation score was still low when the solubility of benzyl alcohol was about 5 vol%, but when the solubility of benzyl alcohol exceeded 10 vol%, the evaluation score tended to increase sharply.

The highest evaluation score was obtained when the solubility (vol%) of benzyl alcohol exceeded about 15 vol% and reached at least about 25 vol%.

Thus, it can be understood that: by appropriately adjusting the solubility of benzyl alcohol in the rinse agent to 10 vol% or more, favorable results were obtained with respect to evaluation of compatibility (rinse property, or rinse property).

4. Amine compound having a predetermined boiling point

In addition, in the rinse agent used in the present invention, it is preferable to blend an amine compound having a boiling point of 250 ℃ or lower under atmospheric pressure. That is, the rinsing agent preferably further contains an amine compound having a boiling point of 250 ℃ or lower.

This is because: by blending an amine compound having such a boiling point, the solubility of the flux can be increased without greatly hindering the regeneration of the rinsing agent, and the cleaning performance can be improved.

And, because: by blending the amine compound, reattachment of the flux can be effectively prevented, and the rinse agent can also function as a cleaning agent.

Therefore, the boiling point of the amine compound is more preferably set to a value within the range of 120 to 230 ℃, and further is preferably set to a value within the range of 140 to 220 ℃.

In the present embodiment, the "amine compound" refers to a compound obtained by substituting a hydrogen atom of ammonia with a hydrocarbon group or an aromatic atomic group, and the amine compound includes a primary amine, a secondary amine, and a tertiary amine.

The amount of the amine compound having such a boiling point is preferably in the range of 0.1 to 10 parts by weight per 100 parts by weight of the water-soluble glycol ether compound contained in the rinse agent. In other words, the amount of the amine compound to be blended is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the water-soluble glycol ether compound.

Namely, it is because: if the amount is too small, the effect of blending the amine compound may not be obtained.

On the other hand, is because excessive mixing may corrode metals constituting the cleaning apparatus, conductors on the substrate, and the like, or cause strong odor.

Therefore, the amount of the amine compound to be added is preferably in the range of 0.2 to 5 parts by weight, and more preferably in the range of 0.5 to 3 parts by weight in the step , based on 100 parts by weight of the water-soluble glycol ether compound contained in the rinse agent.

Further, it is preferable that the flash point of the amine compound having a boiling point of 250 ℃ or lower is in the range of 30 to 100 ℃. That is, the flash point of the amine compound is preferably 30 to 100 ℃.

The reason is that: in the case of an amine compound having such a flash point, the flash point of the rinse agent hardly changes even when a relatively large amount of the compound is added.

Thus, as preferable examples of the amine compound having a boiling point of 250 ℃ or lower, kinds or more of N, N, N ', N' -tetramethyl-1, 6-hexanediamine (TMHMDA), N, N, N ', N' -tetramethyl-1, 4-diaminobutane (TMDAB), N, N, N ', N' -tetramethyl-1, 3-diaminopropane (TMDAP), Dibutylamine (DBA), N, N-Diethylhydroxylamine (DEHA) and N-ethylethanolamine (MEM) are listed, and as the combination of two or more of the above-mentioned amine compounds, DBA and DEHA are listed, for example.

In aspects of the present embodiment, the amine compound having a boiling point of 250 ℃ or lower may be a compound having a structure represented by any one of in the following formulae 4 to 7, wherein-C in formula 7_qH_2qThe group represented by (a) may be linear (when q is an integer of 1 to 4) or branched (when q is an integer of 2 to 4). In formula 7, represented by formula-C_rH_2rThe group represented by (a) may be linear (when r is an integer of 1 to 4) or branched (when r is an integer of 2 to 4).

(CH₃)₂－N－(CH₂)_n－N－(CH₃)₂(formula 4)

(H－(CH₂)_m)₂-NH (formula 5)

(H－(CH₂)_p)₂-N-OH (formula 6)

H－C_qH_2q－NH－C_rH_2r-OH (formula 7)

(in the formula 4, n represents an integer of 3-6. in the formula 5, m represents an integer of 4 or 5. in the formula 6, p represents an integer of 2-4. in the formula 7, q represents an integer of 1-4, and r represents an integer of 1-4.)

5. Other compounding ingredients

Further, as other components to be blended with the rinse agent, at least kinds of antioxidants, antistatic agents, surfactants, viscosity modifiers, and the like can be cited.

The amount of these components to be blended may be appropriately determined depending on the purpose of blending, and is usually preferably in the range of 0.01 to 10 wt% with respect to the total amount of the rinsing agent.

6. Flash point

The flash point of the rinse agent measured in accordance with JIS K2265-1 and 4 (determination of flash point) is preferably 50 ℃ or higher. That is, the flash point of the rinsing agent is preferably 50 ℃ or higher.

This is because, even when the rinse agent has a flash point, if the value is 50 ℃ or higher, the treatment becomes easier and the safety can be further improved .

However, when the rinse agent has a flash point, if the value exceeds 120 ℃, the kind of usable rinse agent components may be excessively limited in terms of regeneration, or the cost may increase, which is economically disadvantageous.

Therefore, the flash point of the rinsing agent is preferably in the range of 60 to 120 ℃ and further in the range of 70 to 100 ℃ in step .

7. Light transmittance

Further, it is preferable that the light transmittance (visible light transmittance) of the rinse agent is 90% or more in a temperature range of room temperature to 80 ℃. That is, the light transmittance of the rinse agent is preferably 90% or more in a temperature range of room temperature to 80 ℃.

This is because, by having a predetermined light transmittance in such a temperature range (room temperature to 80 ℃), it can be judged that: no phase separation occurs and virtually no cloud point is present. Therefore, since the cloud point is not present in a predetermined temperature range, a rinse agent having excellent usability can be provided.

That is, the reason is that benzyl alcohol, hydrophobic glycol ether compound, etc. used in the cleaning step of the previous step can be effectively dissolved while the rinse agent is transparent without phase separation, and that the rinse agent can sufficiently function as a rinse agent without causing reattachment of flux.

Therefore, the light transmittance of the rinse agent in the temperature range of room temperature to 80 ℃ is more preferably set to a value of 95% or more, and further preferably set to a value of 98% or more in the step , and the upper limit of the light transmittance is not particularly limited within the range not impairing the effects of the present invention, and may be, for example, 100% or less.

The light transmittance was measured using a spectrophotometer (product name: ultraviolet-visible spectrophotometer V-530, manufactured by Nippon spectral Co., Ltd.) under conditions of visible light (wavelength: 660nm) and room temperature (25 ℃ C.) to 80 ℃.

8. Contact angle

In addition, the rinse agent used in the present invention is preferably reduced in surface modification of the object to be cleaned.

Namely, it can be said that: even if the rinse agent used in the present invention comes into contact with the object to be cleaned, the change in contact angle of water after drying of the object to be cleaned is very small, and the influence of the rinse agent of the present invention on the object to be cleaned is very small.

More specifically, it is preferable that the initial contact angle of water with respect to the solder resist surface of the printed circuit board whose surface is protected by the cured photosensitive solder resist is θ₁The contact angle of water with respect to the surface of the solder resist after immersion in a 30 ℃ rinse agent for 10 minutes was defined as θ₂At this time, the absolute value | θ of the difference between these contact angles is determined₂－θ₁And | is a value of 3 ° or less.

In other words, it is preferable that water is made of a photosensitive solder resist with respect to the surfaceThe initial contact angle of the solder resist surface of the cured-body-protected printed board is represented by θ₁The printed circuit board was immersed in a 30 ℃ rinse agent for 10 minutes, then dried at 100 ℃ for 5 minutes, and the contact angle of water with respect to the solder resist surface of the dried printed circuit board was defined as θ₂At this time, the contact angle θ₂And theta₁Absolute value of the difference | θ₂－θ₁And | is 3 ° or less.

This is because: if the absolute value of the difference in the contact angles exceeds 3 °, the adhesion of the solder resist to the sealing resin, the electrical insulation, and the mechanical strength may be excessively reduced.

Therefore, the absolute value | θ of the difference in the contact angle is more preferably set₂－θ₁| is a value of 2 ° or less, preferably 1 ° or less at step , and the absolute value | θ of the difference between the contact angles₂－θ₁The lower limit of |, which is not particularly limited, may be, for example, 0 ° or more.

9. Manufacturing method

The method for producing the rinse agent of the present embodiment includes a step of mixing the above-described water-soluble glycol ether compound and water or other components. In this mixing step, any method may be used as long as the above-mentioned components such as the water-soluble glycol ether compound and water are uniformly mixed. Examples of the mixing step include: the flask was charged with the specified ingredients, and stirred and mixed with a magnetic stirrer. In addition, the above-mentioned water-soluble glycol ether compound and water may be mixed on an industrial scale in a chemical plant or the like.

[ second embodiment ]

A second embodiment is a method for using kinds of rinse agents, including the following steps (1) to (2).

And (1) cleaning the flux adhering to the object with a cleaning liquid containing of either benzyl alcohol or a hydrophobic glycol ether compound or both.

And (2) rinsing the object to be cleaned in the step (1) with a rinsing agent, wherein the rinsing agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, and the amount of water added is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

That is, the second embodiment is also kinds of cleaning methods of flux using specific cleaning agents and rinsing agents, and is characterized by having steps (1) to (2).

In another aspect of the second embodiment, the method of using the rinse agent includes the following steps (1) to (2).

And (1) cleaning the flux adhering to the object to be cleaned with a cleaning agent containing either a benzyl alcohol or a hydrophobic glycol ether compound or a benzyl alcohol or a hydrophobic glycol ether compound.

And (2) rinsing the object to be cleaned in the step (1) with a rinsing agent, wherein the rinsing agent contains at least a water-soluble glycol ether compound and water, the solubility of the benzyl alcohol is 10 vol% or more, and the amount of water is 50 to 1000 parts by weight per 100 parts by weight of the water-soluble glycol ether compound.

1. Step (1)

The step (1) is a step of cleaning a cleaning object such as a semiconductor device to be soldered, for example, a semiconductor component such as BGA (ball grid array), CSP (chip size package), PGA (pin grid array), LGA (land grid array), a semiconductor tape TAB (tape automated bonding), a semiconductor lead frame, a semiconductor capacitor, a semiconductor resistor, or a substrate for a semiconductor device, with a cleaning agent.

That is, when soldering these objects to be cleaned, flux is used, and therefore, flux adheres to the soldered portion.

Such a flux contains rosin as a main component, and contains an organic acid salt, a glycidyl ether compound, an oxo acid, a (di) carboxylic acid, and the like.

Further, since soldering is performed under heating, the flux also contains a thermally-denatured product such as rosin.

Therefore, it is very difficult to remove the flux using a water-soluble glycol ether compound, and thus it is preferable to remove the flux using a hydrophobic glycol ether compound or benzyl alcohol.

Therefore, preferable examples of the benzyl alcohol (which may be simply referred to as "benzyl alcohol") to be used include: ethyl benzyl alcohol, methyl benzyl alcohol, and the like, and they may be used alone or in combination of two or more.

And, particularly in the present invention, benzyl alcohol is most preferably used.

This is because: in the case of benzyl alcohol, excellent cleaning performance can be exhibited even in a relatively short period of time.

Examples of the hydrophobic glycol ether compound used in the present invention include alone or a combination of two or more of 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), and the like.

In the present invention, both benzyl alcohol and the hydrophobic glycol ether compound may be used in combination.

In addition, other components may be blended with the benzyl alcohol or the hydrophobic glycol ether compound.

The other components to be blended in the cleaning agent include at least kinds of water-soluble glycol ether compounds, amine compounds, antioxidants, antistatic agents, surfactants, rust inhibitors, viscosity modifiers, and the like.

2. Step (2)

The step (2) is a step of rinsing the object to be cleaned, which has been cleaned with the predetermined cleaning agent in the step (1), with a predetermined rinsing agent.

By using the rinsing agent described in embodiment in step (2), the solubility of benzyl alcohol or the like used in the cleaning step of step (1) can be adjusted to a value of 10 vol% or more.

Therefore, even if a relatively large amount of benzyl alcohol is poured into the rinse agent of step (2) by the specific cleaning agent of step (1), the rinse agent does not undergo phase separation between room temperature and 80 ℃, turbidity does not decrease, and predetermined transparency can be maintained.

In addition, the rinse agent used in the present invention can maintain the solubility of benzyl alcohol at 10 vol% or more by adding a specific amount of water to the water-soluble glycol ether compound as described above.

Therefore, the benzyl alcohol or the hydrophobic glycol ether compound mixed into the rinsing agent by the cleaning agent can be easily dissolved.

Further, according to the rinsing agent of the present invention, reattachment of the flux dissolved in the cleaning agent can be effectively suppressed, and the rinsing agent also functions as a cleaning liquid, so that an object to be cleaned having extremely high cleanliness can be obtained.

3. Drying step

After the rinsing treatment (step (2)), the step of drying the object to be cleaned is preferably performed.

The drying conditions may be appropriately set, and the drying temperature is usually preferably in the range of 60 to 120 ℃, more preferably in the range of 80 to 100 ℃.

The drying is performed by blowing hot air at a drying temperature within this range, and the drying time is usually 1 to 20 minutes, preferably 5 to 10 minutes.

This enables drying in a short time because the following constitution is adopted: the rinse agent of the present invention is an aqueous rinse agent having a relatively high boiling point, and a small amount of a predetermined glycol ether is added.

Therefore, by drying as described above, the components contained in the rinsing agent are almost completely removed, and the remaining components other than the components to be left, such as the rust inhibitor, are almost not left on the surface of the object to be cleaned.