TWI756511B - Cleaning agents and how to use them - Google Patents

Abstract

The present invention provides a cleaning agent comprising at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, and relative to 100 parts by weight of the water-soluble glycol ether compound, the preparation of the water The amount is 50 to 1000 parts by weight.

Description

Cleaning agents and how to use them

The present invention relates to a cleaning agent and a method of using the cleaning agent. In particular, it relates to a cleaning agent which is excellent in environmental safety (for example, work environment safety) by containing a specific amount of water, and a method for using the cleaning agent, and on the other hand, is used in the use of a specific cleaning agent. (Benzyl alcohol, etc.) can exhibit excellent cleaning properties after cleaning the object to be cleaned.

Industrial cleaners, such as flux cleaners, are widely used to remove flux and flux residues after bonding electronic components, which are objects to be cleaned, to electrodes of printed wiring boards using solder paste. Therefore, since good cleaning performance is exhibited and there are relatively few environmental problems, a cleaning agent for flux containing a glycol-based cleaning agent containing various glycol-based compounds as a main component is used. [Prior Art Literature] [Patent Literature]

[Patent Document 1] WO2009/020199 [Patent Document 2] Japanese Patent Laid-Open No. 7-080423 [Patent Document 3] Japanese Patent Laid-Open No. 5-175641

[Problems to be Solved by Invention]

Disclosed is a cleaning composition for removing lead-free solder flux, which comprises a non-halogen organic solvent (A) represented by a specific structural formula, an amine compound (B) represented by a specific structural formula, and an amine group-free solvent. A chelating agent (C), and water of a specific amount as needed (for example, refer to WO2009/020199 A (Patent Document 1)).

Furthermore, there is disclosed a cleaning method including a cleaning step of using water at 5 to 100° C. after the cleaning step is performed using a detergent composition containing a nonionic surfactant and/or a hydrocarbon compound, etc. (For example, refer to Japanese Patent Laid-Open No. 7-080423 (Patent Document 2)).

Furthermore, a method for cleaning a substrate is disclosed, wherein a cleaning agent containing a specific glycol ether-based compound is brought into contact with a substrate to which a rosin-based solder flux is attached, and the flux is cleaned and removed from the substrate. , and then a lower alcohol or an aqueous solution thereof as a rinsing agent is brought into contact with the substrate (for example, refer to Japanese Patent Laid-Open No. 5-175641 (Patent Document 3)).

However, there is a problem that the cleaning agent for fluxes disclosed in Patent Document 1 generally has a high boiling point and is difficult to dry in a short time. Furthermore, it was found that the cleaning agent for flux tends to lower the purity of the object to be cleaned. Therefore, the following problem has been found: it is necessary to provide a process of drying the object to be cleaned while replacing the cleaning agent for flux with a cleaning agent such as water and hydrous alcohol.

Furthermore, in the case of the cleaning method disclosed in Patent Document 2, there is a problem that the types of detergent compositions are excessively limited. Furthermore, it was found that in the case of this cleaning method, the water temperature in the cleaning step must be strictly controlled to a value within a specific range (5 to 100°C). Furthermore, it was found that when water is used as the cleaning agent, not only the drying property is poor, but also the solubility to a hydrophobic flux cleaning agent, such as benzyl alcohol, is also low, so that rinsing is likely to be poor.

In the case of the substrate cleaning treatment method disclosed in Patent Document 3, since a water-containing alcohol is used as the cleaning agent, the solubility in the cleaning agent for a hydrophobic flux is relatively good. However, it was found that the cleaning agent has a low flash point and insufficient environmental safety (eg, work environment safety).

Therefore, the inventors of the present invention have studied diligently and found that by setting the ratio of the preparation amount of the water-soluble glycol ether compound to the preparation amount of water as a cleaning agent in a specific ratio, and the solubility of benzyl alcohol in the cleaning agent is adjusted. Set above a certain value, and solve the previous problem. That is, an object of the present invention is to provide a cleaning agent that is used in an environment where an object to be cleaned is cleaned with a hydrophobic specific cleaning agent (benzyl alcohol, etc.) and a method of using the cleaning agent It is a water-based cleaning agent with excellent safety (such as work environment safety), and can exert excellent cleaning performance. [Technical means to solve problems]

According to the present invention, a cleaning agent is provided, which comprises at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, and the preparation of the water is relative to 100 parts by weight of the water-soluble glycol ether compound. The amount is 50 to 1000 parts by weight. According to the present invention, the above-mentioned problems can be solved. The present invention is a cleaning agent excellent in environmental safety (for example, work environment safety) by setting the ratio of the amount of the water-soluble glycol ether compound to the amount of water to be prepared within a specific range. Furthermore, by setting the solubility of benzyl alcohol per unit volume of the cleaning agent to a certain value or more, various cleaning agents such as hydrophobic compounds such as benzyl alcohol, which have been difficult to rinse with water, can be rinsed. Therefore, it is possible to provide a cleaning agent with very little residue of the specific cleaning agent in the object to be cleaned.

Moreover, when forming the cleaning agent of this invention, it is preferable that the light transmittance in the temperature range of room temperature to 80 degreeC is 90% or more. In this way, by having a specific light transmittance in a specific temperature range, it can be judged that there is no phase separation in the temperature range from room temperature to 80°C, and in fact it does not have a cloud point. Therefore, since it does not have a cloud point in a normal use temperature range, and maintains transparency, it can provide the cleaning agent which is easy to use.

Moreover, when forming the cleaning agent of this invention, it is preferable that the flash point of a cleaning agent is 50 degreeC or more. In this way, even when there is a flash point, by setting the value to a value above a specific temperature, it is possible to provide a cleaning agent that is more excellent in environmental safety (for example, work environment safety).

Moreover, when constituting the cleaning agent of the present invention, it is preferable to set the initial contact angle with respect to the water on the resist surface of the printed circuit board whose surface is protected by the photosensitive solder resist cured body as θ ₁ , and set the initial contact angle with respect to the above-mentioned After the printed circuit board was immersed in a cleaning agent at 30°C for 10 minutes, and then dried at 100°C for 5 minutes, when the contact angle of water on the surface of the resist of the printed circuit board was set to θ ₂ , |θ ₂ −θ ₁ | is 3° or less. Thus, by setting it as the absolute value of the difference of a specific contact angle, it becomes possible to quantitatively provide the cleaning agent which has little adverse effect on to-be-cleaned objects, such as a printed circuit board.

Moreover, when forming the cleaning agent of this invention, it is preferable that the boiling point (under atmospheric pressure) of a water-soluble glycol ether compound is 250 degrees C or less. In this way, by limiting the boiling point of the water-soluble glycol ether compound, the regeneration of the cleaning agent can be performed more easily, and the drying property is also more excellent.

Moreover, when constituting the cleaning agent of the present invention, the water-soluble glycol ether compound is preferably selected from the group consisting of ethylene glycol monopropyl ether, ethylene glycol mono-tertiary butyl ether, and 3-methoxy-3-methylbutanol , 3-methoxybutanol, ethylene glycol monoisopropyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol monomethyl ether, diethylene glycol ethyl methyl ether, triethylene glycol dimethyl ether and At least one compound in the group consisting of diethylene glycol dimethyl ether. By using such a water-soluble glycol ether compound, it is possible to provide a relatively inexpensive cleaning agent which is excellent in environmental safety (for example, work environment safety) and has less residue of the cleaning agent.

Moreover, when constituting the cleaning agent of the present invention, it is preferable that the cleaning agent further contains an amine compound having a boiling point of 250° C. or lower, and the compounding amount of the amine compound is 0.1 to 10 parts by weight relative to 100 parts by weight of the water-soluble glycol ether compound. share. In this way, by preparing a specific amount of an amine compound having a specific boiling point, the compatibility with the flux residue contained in the cleaning agent can be improved, the cleaning agent can be regenerated more easily, and the printing effect can be used. A cleaning agent that effectively cleans objects to be cleaned with less adverse effects on objects to be cleaned, such as substrates.

Another aspect of the present invention is a method of using a cleaning agent, which is characterized by having the following steps (1) to (2). (1) The step of cleaning the flux adhering to the object to be cleaned with a cleaning solution containing benzyl alcohol, a hydrophobic glycol ether compound, or any of them (2) The step of cleaning the object to be cleaned in the above step (1) with a cleaning agent, the cleaning agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, Furthermore, the amount of water to be formulated is 50 to 1000 parts by weight relative to 100 parts by weight of the water-soluble glycol ether compound. In this way, by using a cleaning agent in which the ratio of the amount of the water-soluble glycol ether compound and the amount of water to be prepared is within a specific range, and the solubility of benzyl alcohol is set to a specific value or more, a specific cleaning agent is used. After efficiently cleaning the object to be cleaned with an agent, a cleaning process excellent in environmental safety (for example, work environment safety) can also be performed. In addition, when a specific detergent is used in the washing step, the specific detergent in the object to be washed can also be washed with various detergents represented by hydrophobic compounds such as benzyl alcohol, which are difficult to be washed with water. The cleaning agent with very little residue of the cleaning agent is used for cleaning treatment. [Effect of invention]

According to the present invention, it is possible to provide a cleaning agent and a method for using the cleaning agent, which are environmentally safe to use after cleaning an object to be cleaned with a hydrophobic specific cleaning agent (benzyl alcohol, etc.). It is a water-based cleaning agent with excellent performance (such as work environment safety), and can exert excellent cleaning performance.

[1st Embodiment] The first embodiment is a cleaning agent, which is characterized in that it contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, relative to 100 parts by weight of the water-soluble glycol ether compound , and set the amount of water to a value within the range of 50 to 1000 parts by weight. In other words, the above-mentioned cleaning agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more, and relative to 100 parts by weight of the above-mentioned water-soluble glycol ether compound, the preparation amount of the above-mentioned water is 50% ~1000 parts by weight. Hereinafter, the cleaning agent of the 1st Embodiment of this invention is demonstrated concretely, referring drawings suitably. Furthermore, in this specification, the notation in the form of "A to B" refers to the upper limit and lower limit of the range (that is, A or more and B or less), and the case where the unit is not described in A but only in B. , the unit of A is the same as the unit of B.

1. Water-soluble glycol ether compounds Water-soluble glycol ether compounds are the main components of cleaning agents. Here, the "glycol ether compound" refers to a compound obtained by etherifying one or both of the hydroxyl groups of a glycol or its polycondensate. Furthermore, the glycol ether compound constituting the cleaning agent of the present invention is a water-soluble glycol ether, unlike the user (the hydrophobic glycol ether compound contained in the cleaning solution) in the first step (step (1)) described above. compound. The reason is that by using the water-soluble glycol ether compound, even if 100 ml of water is dissolved in 100 parts by weight of water, suspension or separation does not occur. Furthermore, the reason is that the object to be cleaned can be efficiently cleaned by removing the hydrophobic benzyl alcohol or the hydrophobic glycol ether compound remaining in the object to be cleaned. In addition, as the water-soluble glycol ether compound used here, it is preferable that the solubility in water (measurement temperature: 20 degreeC) shows the water solubility of more than 50weight%, for example.

In addition, it is preferable that the water-soluble glycol ether compound used in the present invention has a boiling point (under atmospheric pressure) of usually a value of 250°C or lower. That is, the above-mentioned water-soluble glycol ether compound preferably has a boiling point (under atmospheric pressure) of 250°C or lower. In this embodiment, the "atmospheric pressure" is 1013.25 hPa. The reason is that by using a water-soluble glycol ether compound having such a boiling point, the regeneration of the cleaning agent can be carried out more easily, and the obtained cleaning agent is no longer flammable and becomes environmentally safe (for example, a safe working environment). sex) is also better. Therefore, even when the cleaning agent of the present invention has a flash point, it is preferable that the flash point is 50° C. or higher, or it does not have a flash point. That is, during the operation of the cleaning apparatus, the risk of ignition of the cleaning agent is eliminated, and the cleaning operation including a very stable cleaning step can be performed. Therefore, it is more preferable to set the boiling point of the water-soluble glycol ether compound to a value within a range of 120 to 230°C, and more preferably to a value within a range of 140 to 220°C.

Moreover, as a specific example of such a water-soluble glycol ether compound, one selected from ethylene glycol monopropyl ether (PS), ethylene glycol monotertiary butyl ether (ETB), 3-methoxy-3-methyl ether can be mentioned. butanol (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) at least one compound. The said water-soluble glycol ether compound may be used individually by 1 type, and may be used in combination of a plurality of types. Examples of combinations of the above 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 and DMTG. Furthermore, of course, three or more of the above-mentioned water-soluble glycol ether compounds may be combined.

In one aspect of this embodiment, the water-soluble glycol ether compound may also 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 with 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 with 1 or 2 carbon atoms. In Formula 3, among R ⁵ and R ⁷ One of them represents a hydrogen atom, and the other represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms).

In Formula 1, as a 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 is preferably a group represented by -[CH ₂ CH(CH ₃ )-O] ₂ -.

Moreover, among these water-soluble glycol ether compounds, if it is ethylene glycol monopropyl ether, ethylene glycol mono-tertiary butyl ether, 3-methoxy-3-methyl butanol, dipropylene glycol monomethyl ether, tripropylene glycol Glycol dimethyl ether or the like can be used as a more preferable water-soluble glycol ether compound from the viewpoint of safety, compatibility with hydrophobic compounds (rinsing properties), and drying properties.

2. Water When constituting a cleaning agent, it is characterized in that the mixing amount of water is set to a value within the range of 50 to 1000 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound. In other words, the mixing amount of the water is 50 to 1000 parts by weight relative to 100 parts by weight of the water-soluble glycol ether compound. The reason for this is that, if the amount of water to be prepared is too small, the flammability of the obtained cleaning agent may become high, or an adverse effect (change in contact angle) on the resist may occur. On the other hand, when the preparation amount of water is too large, the cleaning property by the cleaning agent or the re-adhesion prevention property of the flux may be remarkably lowered.

Therefore, when the cleaning agent is constituted, it is preferable to set the compounding amount of water to a value within the range of 80 to 600 parts by weight, more preferably 100 to 400 parts by weight, relative to 100 parts by weight of the water-soluble glycol ether compound. value within the range. In other words, with respect to 100 parts by weight of the above water-soluble glycol ether compound, the amount of water to be formulated is preferably 80 to 600 parts by weight, and more preferably 100 to 400 parts by weight. In addition, as the water for preparing the water-soluble glycol ether compound, pure water (ion-exchanged water, distilled water, etc.) is preferable, and it is preferable to have a purity of about 10 μS/cm of conductivity, more preferably 1 μS The purity of about /cm. In other words, the above-mentioned water preferably has a conductivity of 1 to 10 μS/cm, more preferably 1 to 5 μS/cm.

3. Solubility Moreover, regarding the characteristic of a cleaning agent, it is characterized in that the solubility of benzyl alcohol with respect to the unit volume (100 ml) of this cleaning agent is set to the value of 10 vol% or more. In other words, the solubility of benzyl alcohol relative to the unit volume (100 ml) of the above cleaning agent is 10 vol% or more. That is, the cleaning agent used in the present invention has the above-mentioned configuration in order to also clean the object to be cleaned to which the same is adhered even when a specific cleaning agent such as benzyl alcohol or a hydrophobic glycol ether compound is used. Here, the reason for using the solubility of benzyl alcohol as an index is that among benzyl alcohol and the hydrophobic glycol ether compound, the one with the lowest solubility in the cleaning agent is benzyl alcohol. The reason for this is that as long as the solubility of benzyl alcohol relative to the unit volume (100 ml) of the cleaning agent is 10 vol% or more, the change in the turbidity value during cleaning can be reduced as much as possible. Maintain the state of a transparent cleaning agent.

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

Here, referring to FIG. 1 , the relationship between the solubility (vol%) of benzyl alcohol per unit volume (100 ml) of the cleaning agent and the score (relative value) of compatibility (rinsing property or cleaning property) will be described. That is, the horizontal axis in FIG. 1 represents the solubility (vol%) of benzyl alcohol per unit volume of the cleaning agent, and the vertical axis represents the compatibility (rinsing property or cleaning property) score (relative value). Here, the scores of 0, 1, 2, 3, 4, and 5 on the vertical axis correspond to the evaluations E, D, C, B, A', and A of the cleaning properties in the following examples, respectively. Moreover, according to the characteristic curve in Figure 1, when the solubility of benzyl alcohol is about 5 vol%, the score is still low, but when the solubility of benzyl alcohol exceeds 10 vol%, the score tends to increase sharply. Furthermore, when the solubility (vol%) of benzyl alcohol exceeds about 15 vol% to at least about 25 vol%, the highest score can be obtained. Therefore, it was found that by appropriately adjusting the solubility of benzyl alcohol in the cleaning agent to 10 vol% or more, good results can be obtained in the evaluation of compatibility (rinsing property or cleaning property).

4. Amine compounds with specific boiling point Moreover, in the cleaning agent used by this invention, it is preferable to mix|blend the amine compound whose boiling point in atmospheric pressure is 250 degrees C or less. That is, it is preferable that the said cleaning agent further contains the amine compound whose boiling point is 250 degrees C or less. The reason for this is that the solubility of the flux can be increased without hindering the regeneration of the cleaning agent by preparing the amine compound having the boiling point, thereby improving the cleaning performance. Furthermore, the reason is that the re-adhesion of the flux can be effectively prevented by preparing the amine compound, and the cleaning agent can also function as a cleaning agent. Therefore, it is more preferable to set the boiling point of this amine compound to the value within the range of 120-230 degreeC, and it is more preferable to set it as the value within the range of 140-220 degreeC.

In this embodiment, the "amine compound" refers to a compound obtained by substituting a hydrocarbon group or an aromatic atomic group for the hydrogen atom of ammonia. The above-mentioned amine compound includes a primary amine, a secondary amine, and a tertiary amine. Moreover, in another aspect, the said amine compound contains an aliphatic amine and an aromatic amine. In yet another aspect, the above-mentioned amine compounds include monoamines, diamines, and polyamines.

Moreover, it is preferable to make the compounding quantity of the amine compound which has such a boiling point into the value within the range of 0.1-10 weight part normally with respect to 100 weight part of water-soluble glycol ether compounds contained in a cleaning agent. In other words, it is preferable that the compounding quantity of this amine compound is 0.1-10 weight part with respect to 100 weight part of said water-soluble glycol ether compounds. That is, the reason for this is that when the amount of the compound is too small, the compounding effect of the amine compound may not be obtained. On the other hand, the reason for this is that, if the mixture is excessively mixed, the metal constituting the cleaning device, the conductors in the substrate, and the like may be corroded, or the odor may become stronger. Therefore, the compounding amount of the above-mentioned amine compound is more preferably a value within the range of 0.2 to 5 parts by weight with respect to 100 parts by weight of the water-soluble glycol ether compound contained in the cleaning agent, and more preferably 0.5 to 3 parts by weight Values within the range of parts by weight.

Moreover, it is preferable to set the flash point of the amine compound whose boiling point is 250 degrees C or less into the value within the range of 30-100 degreeC. That is, the above-mentioned amine compound preferably has a flash point of 30 to 100°C. The reason for this is that in the case of an amine compound having such a flash point, even if it is mixed in a relatively large amount, the flash point of the cleaning agent hardly changes.

Therefore, as a preferable example of the amine compound whose boiling point is 250 ℃ or less, 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), N-ethylethanolamine (MEM) alone or a combination of two or more. As a combination of the said amine compound of 2 or more types, DBA and DEHA are mentioned, for example.

In an aspect of this embodiment, the amine compound whose boiling point is 250 degrees C or less may be a compound having a structure represented by any one of the following formulae 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 (when q is an integer of 2 to 4) Time). 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 (when r is an integer of 2 to 4) Time). (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) HC _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 represents an integer of 1 to 4, and r represents an integer of 1 to 4).

5. Other ingredients Moreover, as another component mix|blended with a cleaning agent, at least 1 sort(s) of antioxidant, an antistatic agent, a surfactant, a viscosity modifier, etc. are mentioned. Moreover, the compounding amount of these components can be suitably determined according to the compounding purpose, respectively, but it is generally preferable to set it as the value within the range of 0.01-10weight% with respect to the whole quantity of a cleaning agent.

6. Ignition point Preferably, the flash point of the cleaning agent measured in accordance with JIS K 2265-1 and 4 (method for obtaining flash point) is set to a value of 50° C. or higher. That is, it is preferable that the above-mentioned cleaning agent has a flash point of 50° C. or higher. The reason for this is that even when the cleaning agent has an ignition point, as long as the value is 50° C. or higher, it is easier to handle, and the safety can be further improved. However, when the cleaning agent has a flash point, if the value exceeds 120° C., the types of ingredients that can be used in the cleaning agent for regeneration are excessively limited, or the cost increases, which is economically disadvantageous. Therefore, it is preferable to set the flash point of the cleaning agent to a value within a range of 60 to 120°C, and more preferably to a value within a range of 70 to 100°C.

7. Light transmittance Moreover, it is preferable to set the light transmittance (visible light transmittance) of the cleaning agent in the temperature range of room temperature to 80 degreeC to the value of 90% or more. That is, the above-mentioned cleaning agent preferably has a light transmittance of 90% or more in a temperature range from room temperature to 80°C. The reason for this is that by having a specific light transmittance in such a temperature range (room temperature to 80° C.), it can be judged that there is no phase separation, and in fact, there is no cloud point. Therefore, since it does not have a cloud point in a specific temperature range, a cleaning agent with good ease of use can be provided. That is, the reason is that the benzyl alcohol, the hydrophobic glycol ether compound, etc. used in the cleaning step which is the previous step can be effectively compatible with each other while the cleaning agent is transparent without phase separation. In addition, the reason for this is that the re-adhesion of the flux does not occur at this time, and it can sufficiently function as a cleaning agent. Therefore, it is more preferable to set the light transmittance of the cleaning agent in a temperature range of room temperature to 80° C. to a value of 95% or more, and more preferably to a value of 98% or more. The above-mentioned light transmittance is not particularly limited as long as the effect of the present invention is not impaired, and for example, 100% or less can be mentioned. Furthermore, the light transmittance was measured using a spectrophotometer (manufactured by JASCO Corporation, product name: UV-Vis Spectrophotometer V-530) under visible light (wavelength 660 nm) and room temperature (25°C) ~ 80 ℃ conditions.

8. Contact Angle In addition, the cleaning agent used in the present invention is preferably to reduce surface modification of the object to be cleaned. That is, even if the cleaning 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 cleaning agent of the present invention has very little influence on the object to be cleaned. . More specifically, it is preferable to set the initial contact angle with respect to the water on the resist surface of the printed circuit board whose surface is protected by the photosensitive solder resist cured body as θ ₁ , and set the initial contact angle with respect to the water in the cleaning agent at 30° C. When the contact angle of water on the surface of the resist after immersion for 10 minutes is set to θ ₂ , the absolute value |θ ₂ -θ ₁ | of the difference between the contact angles is set to a value of 3° or less. In other words, it is preferable to set the initial contact angle with respect to the water on the resist surface of the printed circuit board whose surface is protected by the photosensitive solder resist cured body as θ ₁ , and set the initial contact angle with respect to the cleaning agent of the printed circuit board at 30° C. The absolute value _{of the difference between the contact angles θ 2 and θ 1 | θ 2} −θ ₁ | is 3° or less. The reason for this is that when the absolute value of the difference between the contact angles exceeds 3°, the adhesion between the resist and the sealing resin, the electrical insulating properties, and the mechanical strength may be excessively lowered. Therefore, it is more preferable to set the absolute value |θ ₂ −θ ₁ | of the difference between the contact angles to a value of 2° or less, and more preferably to set it to a value of 1° or less. The lower limit of the absolute value |θ ₂ −θ ₁ | of the difference between the contact angles is not particularly limited, and for example, it is 0° or more.

9. Manufacturing method The manufacturing method of the cleaning agent of this embodiment includes the step of mixing components such as the above-mentioned water-soluble glycol ether compound and water. Regarding the step of mixing, any method can be used as long as the components such as the water-soluble glycol ether compound and water are uniformly mixed. As a step of mixing, for example, adding a specific component to a flask, and stirring and mixing with a magnetic stirrer can be mentioned. Moreover, in a chemical facility etc., components, such as the said water-soluble glycol ether compound and water, can also be mixed on an industrial scale.

[Second Embodiment] The second embodiment is a method of using a cleaning 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 solution containing benzyl alcohol, a hydrophobic glycol ether compound, or any of them. (2) The step of cleaning the object to be cleaned in the above step (1) with a cleaning agent, the cleaning agent contains at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is 10 vol% or more. , and relative to 100 parts by weight of the water-soluble glycol ether compound, the preparation amount of water is set to 50 to 1000 parts by weight. That is, the second embodiment is a cleaning method characterized by the steps (1) to (2) using a specific cleaning agent and a flux of the cleaning agent.

In another aspect of the above-mentioned second embodiment, the method of using the cleaning agent includes the following steps (1) to (2) of the method of using the cleaning agent. (1) Step of cleaning the flux adhering to the object to be cleaned using a cleaning agent containing benzyl alcohol, a hydrophobic glycol ether compound, or any of them (2) The step of cleaning the above-mentioned object to be cleaned in the above-mentioned step (1) with a cleaning agent, the cleaning agent contains at least a water-soluble glycol ether compound and water, and the solubility of the above-mentioned benzyl alcohol is 10 vol% The above, and with respect to 100 parts by weight of the water-soluble glycol ether compound, the amount of the water to be formulated is 50 to 1000 parts by weight.

1. Step (1) Step (1) is to solder semiconductor components, such as BGA (ball grid array, ball grid array), CSP (chip size package, chip size package), PGA (pin grid array, pin grid array), LGA (land grid array) , contact grid array) and other semiconductor parts, semiconductor mounting TAB (tape automated bonding, tape and tape automatic bonding) tape, semiconductor mounting lead frames, semiconductor mounting capacitors, semiconductor mounting resistors, semiconductor element substrates, etc. cleaning steps. That is, since the flux is used in the soldering of the objects to be cleaned, the flux adheres to the soldered portion. Moreover, this type of 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. In addition, since the soldering is performed under heating, the flux also contains thermally denatured substances such as rosin. Therefore, since it is very difficult to use a water-soluble glycol ether compound to remove the flux, it is preferable to use a hydrophobic glycol ether compound or benzyl alcohol for the removal of the flux.

Therefore, preferable examples of the benzyl alcohols to be used (sometimes abbreviated as "benzyl alcohol") include ethyl benzyl alcohol, methyl benzyl alcohol, benzyl alcohol, etc., which are used alone or in combination of two or more kinds. used in combination. Moreover, especially in this invention, it is preferable to use benzyl alcohol. The reason for this is that in the case of benzyl alcohol, even for a relatively short period of time, excellent detergency can be exhibited.

Further, 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), and 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), etc. alone or in combination of two or more. In addition, as the hydrophobic glycol ether compound used here, it is preferable that the solubility in water (measurement temperature: 20 degreeC) shows the hydrophobicity of 50 weight% or less, for example.

Furthermore, in this invention, you may mix and use both benzyl alcohol and a hydrophobic glycol ether compound. Moreover, other components can also be mix|blended with benzyl alcohol or a hydrophobic glycol ether compound. In addition, as other components mix|blended with a detergent, at least one of a water-soluble glycol ether compound, an amine compound, antioxidant, an antistatic agent, a surfactant, a rust inhibitor, a viscosity modifier, etc. is mentioned.

2. Step (2) The step (2) is a step of using a specific cleaning agent to clean the object to be cleaned using the specific cleaning agent in the step (1). Furthermore, in the step (2), by using the cleaning agent described in the first embodiment, the solubility of the benzyl alcohol or the like used in the cleaning step in the step (1) can be adjusted to be as high as 10 vol% or more value. Therefore, even if a relatively large amount of benzyl alcohol flows into the cleaning agent of step (2) due to the specific cleaning agent of step (1), the cleaning agent will not phase-separate between room temperature and 80°C, and the turbidity will not be reduced. will decrease while maintaining a certain level of transparency.

In addition, the cleaning agent used in the present invention can maintain the solubility of benzyl alcohol at 10 vol% or more by mixing a specific amount of water with the water-soluble glycol ether compound as described above. Therefore, the benzyl alcohol or the hydrophobic glycol ether compound mixed into the cleaning agent due to the cleaning agent can be easily compatible with each other. Furthermore, according to the cleaning agent of the present invention, the re-adhesion of the flux dissolved in the cleaning agent can be effectively suppressed, and the cleaning agent can also function as a cleaning liquid, so that a cleaning object with a very high degree of purity can be obtained.

3. Drying step It is preferable to perform the step of drying the object to be washed after the washing process (step (2)). The drying conditions can be appropriately set, but the drying temperature is preferably set to a value within a range of 60 to 120°C, more preferably within a range of 80 to 100°C. Moreover, at the 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 this can be dried in a short time is that the cleaning agent of the present invention is water-based and has a relatively high boiling point, but a small amount of a specific glycol ether is added. Therefore, by drying in the above-described manner, the preparation components of the cleaning agent are almost completely removed, and the surface of the object to be cleaned is in a state where almost no excess components remain except for the components intentionally remaining such as the rust inhibitor. [Example]

Next, although the Example of this invention is shown and this invention is demonstrated in detail, this invention is not limited to these. In addition, in the following table, the names of the compounds used to constitute the cleaning agents of the examples, their abbreviations and their physical properties are shown.

[Table 1]

[Example 1] 1. Step (1) As a cleaning device, a micro cleaner MC3USHD-1.5E (manufactured by Kaken Tech Co., Ltd.) was used, and benzyl alcohol as a cleaning solution was accommodated in the cleaning tank. Next, the cleaning device is operated to clean the substrate with the semiconductor element as the object to be cleaned. That is, using benzyl alcohol as a cleaning solution contained in a cleaning tank, the object to be cleaned was immersed in it, and ultrasonic cleaning was performed under the conditions of 70° C. for 5 minutes.

2. Step (2) Next, the to-be-cleaned object washed in the washing tank is moved to the washing tank using a conveying device. That is, in the cleaning tank which accommodated the cleaning liquid, under the conditions of 30 degreeC and 5 minutes, the to-be-cleaned object was immersed in the cleaning agent, and the cleaning process was further performed. The composition and characteristics of this cleaning agent are shown in Table 2. Furthermore, a specific distillation device is installed in the cleaning tank for storing the cleaning agent, and the cleaning solution is distilled to separate the compatible benzyl alcohol.

3. Drying step The object to be cleaned subjected to the cleaning treatment in the above manner was taken out from the cleaning tank, and was dried with hot air under the drying conditions of 100° C. and 5 minutes. As a result, it was visually confirmed that the cleaning agent and the like were completely removed from the surface of the object to be washed.

4. Evaluation of physical properties (1) (1) Determination method of the solubility of benzyl alcohol Weigh 100 ml of detergent into a 200 ml graduated cylinder. 1 ml of benzyl alcohol was added dropwise thereto and stirred. If the solution is uniform and transparent after stirring, add 1 ml of benzyl alcohol dropwise again and stir. Then, the above-mentioned dropwise addition and stirring were repeated, and the total volume (ml) of benzyl alcohol added dropwise at the point when cloudiness/separation occurred after stirring was measured, and finally how much ml of benzyl alcohol dissolved in the cleaning agent was measured. From this, the dissolved amount (vol%) of benzyl alcohol was calculated, and it was set as the solubility of benzyl alcohol in a cleaning agent.

(2) Evaluation method of cleaning property (rinsing property) 200 g each of benzyl alcohol and cleaning agent were placed in a beaker with a capacity of 300 ml. After that, the temperature of the benzyl alcohol system was maintained at 60°C, and the temperature of the cleaning agent system was maintained at 30°C. Next, the epoxy glass substrate was accommodated in the beaker in which the benzyl alcohol was placed, and in this state, the magnetic stirrer in the beaker in which the benzyl alcohol was placed was rotated, and immersion was performed for 10 minutes. Then, the rotation of the magnetic stirrer was stopped, and the glass epoxy substrate was taken out from the benzyl alcohol, and then the glass epoxy substrate was accommodated in the beaker containing the cleaning agent, and in this state, the cleaning agent was placed in the glass epoxy substrate. The magnetic stirrer in the beaker rotates to carry out the immersion for a specific time. Then, the rotation of the magnetic stirrer was stopped, the glass epoxy substrate was taken out from the cleaning agent, and dried for 10 minutes using a circulating oven maintained at 100°C. After that, the dried epoxy glass substrate was taken out from the circulation oven, the surface was visually observed, and the cleaning property (rinsing property) of the cleaning agent was evaluated against the following criteria. A: The cleaning time is 5 minutes and there is no liquid residue of benzyl alcohol. A': The cleaning time was 7 minutes and no liquid of benzyl alcohol remained. B: The cleaning time was 10 minutes and no liquid of benzyl alcohol remained. C: The cleaning time was 10 minutes and a little liquid of benzyl alcohol remained. D: The cleaning time was 10 minutes and a large amount of liquid of benzyl alcohol remained. E: The cleaning time was 15 minutes and a large amount of liquid of benzyl alcohol remained.

(3) Evaluation method of dryness After storing 200 g of the cleaning agent in a beaker with a capacity of 300 ml, the temperature was maintained at 30°C. Next, the epoxy glass substrate was accommodated in a beaker containing 200 g of cleaning agent, and in this state, the magnetic stirrer in the beaker was rotated to perform immersion for 10 minutes. Then, the rotation of the magnetic stirrer was stopped, the glass epoxy substrate was taken out from the cleaning agent, and dried for a specific time using a circulating oven maintained at 100°C. Then, the dried epoxy glass substrate was taken out from the circulation oven, the surface was visually observed, and the drying property of the cleaning agent was evaluated against the following criteria. A: It can be dried within 5 minutes. A': It can be dried within 7 minutes. B: It can be dried within 10 minutes. C: 10 minutes of drying with a little liquid remaining. D: 10 minutes of drying with a large amount of liquid remaining.

(4) Measurement method of ion-exchanged water contact angle 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. Relative to the surface of the solder resist before cleaning, and the surface of the resist that was cleaned with various cleaning agents under the condition of stirring and immersing at 30°C/10 minutes and then dried under the condition of hot air at 100°C/5 minutes, the ionic Changes in the contact angle of exchange water (|θ ₂ −θ ₁ |). Here, θ ₁ represents the contact angle (initial contact angle) with respect to the ion-exchanged water on the surface of the solder resist before cleaning, and θ ₂ represents the contact angle with respect to the ion-exchanged water on the surface of the resist after performing the above-mentioned cleaning treatment and drying treatment. Contact angle.

(5) Determination method of cloud point The liquid temperature of the sample (cleaning agent) was set to 20° C., the temperature was gradually increased while measuring the appearance, and the temperature at which the sample started to become cloudy or separated was set as the cloud point. However, the cloud point is preferably absent in a temperature range of at least room temperature to 80°C. That is, since it does not have a cloud point in such a use temperature range (room temperature - 80 degreeC), and maintains transparency, it is because it can provide the cleaning agent with favorable usability. Therefore, it is practically convenient to have a specific light transmittance due to transparency in a specific temperature range, so that no phase separation occurs in a temperature range from room temperature to 80°C. In addition, the evaluation of "None" of the cloud point in the following Tables 2 to 4 means that the cleaning agent does not become cloudy or separate in the range of 20°C to 80°C.

(6) Measurement method of turbidity, evaluation of re-adhesion of flux A commercially available post-flux (model: SPARKLE FLUX PO-Z-7 (manufactured by Sento Metal Industry Co., Ltd.) was used, and after the solvent was distilled off from the post-flux, the recovered solid residue (flux) was used as a sample . And flux was added so that it might become 3 weight% with respect to benzyl alcohol. 1% by weight of the flux-mixed benzyl alcohol solution obtained in this way was added to each cleaning agent, and the turbidity was measured using a water quality meter WA-1 (manufactured by Nippon Denshoku Kogyo Co., Ltd.). The haze was used as an index of the re-adhesion of the flux. In addition, it can be said that the closer the turbidity is to 0, the more transparent and uniform it is, and the more difficult it is to reattach.

(7) Determination method of ignition point The flash point of the cleaning agent was measured in accordance with JIS K 2265-1 and 4 (method for obtaining flash point). In addition, it is preferable that a flash point does not have a flash point, but even if there is a flash point, the temperature of 50 degreeC or more is preferable. Here, "having no flash point" means that there is no flash point in the range above room temperature and below the boiling point of the cleaning agent.

[Example 2] In Example 2, the same amount of ETB was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was performed in the same manner. The obtained results are shown in Table 2.

[Example 3] In Example 3, the same amount of MMB was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

[Example 4] In Example 4, the same amount of iPG was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

[Example 5] In Example 5, the same amount of DPM was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was performed in the same manner. The obtained results are shown in Table 2.

[Example 6] In Example 6, the same amount of MEDG was used instead of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was performed in the same manner. The obtained results are shown in Table 2.

[Example 7] In Example 7, the same amount of DMTG was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

[Example 8] In Example 8, the same amount of DMDG was used in place of the ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the treatment of the object to be washed was carried out in the same manner. 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 set to 20 parts by weight, and the amount of water was changed to 80 parts by weight. Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 2.

[Example 10] In Example 10, in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, 15 parts by weight of PS and 15 parts by weight of MMB were used in the same manner. Carry out the treatment of the cleaned objects. The obtained results are shown in Table 2.

[Example 11] In Example 11, instead 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 1 part by weight of TMHMDA as an amine compound was used, and water Except that the amount was changed to 69 parts by weight, the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

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

[Example 13] In Example 13, 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 MMB were used, and then the amount of water was changed to 60 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 2.

[Example 14] In Example 14, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 30 parts by weight of ETB was used, and then 1 part by weight of TMHMDA as an amine compound was used, and then Except that the amount of water was changed to 69 parts by weight, the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

[Example 15] In Example 15, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 30 parts by weight of DPM was used, and 0.5 parts by weight of DBA and 0.5 parts by weight of DEHA were used as amine compounds Parts by weight, and the amount of water was changed to 69 parts by weight, and the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 2.

[Example 16] In Example 16, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 30 parts by weight of PS and 5 parts by weight of DPM were used, and then the amount of water was changed to 65 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 3.

[Example 17] In Example 17, instead of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, 10 parts by weight of PS and 30 parts by weight of DMTG were used, and then the amount of water was changed to 60 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 3.

[Example 18] In Example 18, in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, 10 parts by weight of ETB and 20 parts by weight of MMB were used in the same manner. Carry out the treatment of the cleaned objects. 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 the step (2) of Example 1, 10 parts by weight of ETB and 15 parts by weight of DPM were used, and then the amount of water was changed to 75 parts by weight. Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. 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, and then the amount of water was changed to 60 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. 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 then TMHMDA 1 as an amine compound was used Parts by weight, and the amount of water was changed to 64 parts by weight, and the treatment of the object to be washed was carried out in the same manner. 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 then TMDAP 1 as an amine compound was used Parts by weight, and the amount of water was changed to 69 parts by weight, and the treatment of the object to be washed was carried out in the same manner. 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, and then the amount of water was changed to 70 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. 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 the step (2) of Example 1, 20 parts by weight of PS and 20 parts by weight of IPDM were used, and then the amount of water was changed to 60 Parts by weight, other than this, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 3.

[Comparative Example 1] In Comparative Example 1, 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 changed to 80 parts by weight, and the amount of water was changed to 20 parts by weight, other than that, the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 4.

[Comparative Example 2] In Comparative Example 2, 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 3 parts by weight of BFG were used, and then the amount of water used was changed to 82 parts by weight, other than that, the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 4.

[Comparative Example 3] In Comparative Example 3, instead of 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 changed to 60 parts by weight, in addition to this Otherwise, the treatment of the object to be washed is carried out in the same manner. The obtained results are shown in Table 4.

[Comparative Example 4] In Comparative Example 4, 25 parts by weight of DMFDG was used to replace 30 parts by weight of ethylene glycol monopropyl ether (PS) used in step (2) of Example 1, and the amount of water was changed to 75 parts by weight, except that , in the same way to deal with the objects to be cleaned. The obtained results are shown in Table 4.

[Comparative Example 5] In Comparative Example 5, instead of 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, and MEM 1 as an amine compound was used Except for changing the amount of water to 69 parts by weight, the treatment of the object to be washed was carried out in the same manner. The obtained results are shown in Table 4.

[Comparative Example 6] In Comparative Example 6, 30 parts by weight of DEDG was used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, and the cleaning was carried out in the same manner. processing. The obtained results are shown in Table 4.

[Comparative Example 7] In Comparative Example 7, except that 30 parts by weight of iBG was used in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2) of Example 1, the cleaning was carried out in the same manner. processing. The obtained results are shown in Table 4.

[Comparative Example 8] In Example 1, in place of 30 parts by weight of ethylene glycol monopropyl ether (PS) used in the step (2), 60 parts by weight of ethanol was used, and the amount of water was changed to 40 parts by weight. The way to carry out the treatment of the object to be cleaned. The obtained results are shown in Table 4.

[Table 2]

[table 3]

[Table 4]

5. Evaluation of physical properties (2) (1) Measurement method of light transmittance The light transmittances of the cleaning agents of Examples 1 to 24 and Comparative Examples 1 to 8 were measured by the following method. First, put 200 g of cleaning agent in a beaker with a capacity of 300 ml. Then, maintaining at a specific temperature (20, 40 or 80° C.), using a magnetic stirrer, the stirring member in the beaker is rotated to stir the cleaning agent. Immediately after the stirring cleaning agent was stored in the tank of the spectrophotometer, the light transmittance was measured under the following conditions. The measurement results are shown in Table 5. From the results in Table 5, it was confirmed that the cleaning 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-Vis Spectrophotometer V-530 (manufactured by JASCO Corporation) Measurement wavelength: visible light (660 nm)

[產業上之可利用性][table 5]

[Industrial Availability]

As described above, according to the present invention, by setting the ratio of the compounding amount of the water-soluble glycol ether compound to the compounding amount of water to a value within a specific range, and setting the solubility of benzyl alcohol to a specific value or more, it is possible to Significantly improve environmental safety (eg work environment safety). Furthermore, according to the present invention, not only the conventional water-soluble glycol ether compounds but also the cleaning properties and drying properties of the objects to be cleaned by hydrophobic solvents such as benzyl alcohol and hydrophobic glycol ether compounds can be improved.

Furthermore, according to the present invention, since the cleaning property after cleaning is also excellent, and the cleaning property and the re-adhesion prevention property of the flux are also improved, it can be used as both a cleaning agent and a cleaning agent.

Furthermore, since the present invention is a method of using a specific cleaning agent, after the object to be cleaned is efficiently washed with the specific cleaning agent, environmental safety (for example, work environment safety) and excellent reproducibility can be efficiently obtained. , and the object to be cleaned with less residue of detergent. Therefore, according to the cleaning agent of the present invention and a method of using the same, industrially, safe, efficient and inexpensive cleaning or cleaning of objects to be cleaned is greatly expected.

As described above, the embodiments and examples of the present invention have been described, but it is also intended to appropriately combine the configurations of the above-described embodiments and examples from the beginning.

It should be understood that the embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown by the scope of the patent application rather than the above-described embodiments and examples, and is intended to include the meaning equivalent to the scope of the patent application and all changes within the scope.

FIG. 1 is a graph for explaining the relationship between the solubility (vol%) of benzyl alcohol relative to the unit volume (100 ml) of the cleaning agent and the score (relative value) of compatibility (rinsing property).

Claims (8)

A cleaning agent comprising at least a water-soluble glycol ether compound and water, and the solubility of benzyl alcohol is more than 10 vol%, and The compounding quantity of the said water is 50-1000 weight part with respect to 100 weight part of said water-soluble glycol ether compounds. For the cleaning agent of claim 1, its light transmittance in the temperature range from room temperature to 80°C is more than 90%. If the cleaning agent of claim 1 or 2, its ignition point is above 50 ℃. The cleaning agent according to claim 1 or 2, wherein the initial contact angle with respect to water on the surface of the printed circuit board whose surface is protected by the photosensitive solder resist cured body is set to θ ₁ , and the initial contact angle with respect to the surface of the printed circuit board with respect to the above-mentioned printed circuit board is set at 30 The absolute value of the difference between the contact angles θ ₂ and θ ₁ when the contact angle of water on the surface of the printed circuit board dried at 100° C. for 5 minutes after being immersed in a cleaning agent at 100° C. for 5 minutes is θ ₂ |θ ₂ −θ ₁ | is 3° or less. The cleaning agent according to claim 1 or 2, wherein the boiling point of the water-soluble glycol ether compound is 250°C or lower. The cleaning agent according to claim 1 or 2, wherein the above water-soluble glycol ether compound is selected from ethylene glycol monopropyl ether, ethylene glycol monotertiary butyl ether, 3-methoxy-3-methylbutanol, 3-Methoxybutanol, ethylene glycol monoisopropyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol monomethyl ether, diethylene glycol ethyl methyl ether, triethylene glycol dimethyl ether, and At least one compound in the group consisting of diethylene glycol dimethyl ether. The cleaning agent according to claim 1 or 2, further comprising an amine compound with a boiling point of 250°C or less, and The compounding quantity of this amine compound is 0.1-10 weight part with respect to 100 weight part of said water-soluble glycol ether compounds. A method of using a cleaning agent, comprising 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 any of them; (2) The step of cleaning the object to be cleaned in the above step (1) with a cleaning agent, the cleaning agent contains at least a water-soluble glycol ether compound and water, and the solubility of the benzyl alcohol is 10 vol% or more Moreover, the compounding quantity of the said water is 50-1000 weight part with respect to 100 weight part of said water-soluble glycol ether compounds.

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