JP2005112887A - Detergent composition for flux and method for washing using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent composition for flux having excellent detergency of the flux while consisting essentially of limonene and water which are natural components with a low content of VOC (volatile organic compounds) and having excellent handleability and treating properties by taking environmental problems into consideration and to provide a method for washing using the same. <P>SOLUTION: The detergent composition for the flux comprises the limonene, a surfactant and water and further contains an amine compound. The content of the limonene is regulated within the range of 1 to <40 wt.% based on the total amount. The content of the amine compound is a value within the range of 1-400 pts.wt. based on 100 pts.wt. of the limonene. The method for washing using the composition is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flux cleaning composition and a cleaning method using the same, and more particularly, to a flux cleaning composition excellent in cleaning properties and a cleaning method using the same while considering environmental issues.

Conventionally, a water-soluble resin treatment agent that contains a predetermined amount of limonene, water, and a surfactant and is emulsified is known because it is mainly composed of natural ingredients and has less environmental problems (for example, Patent Document 1).
In addition, as a terpene compound, a d-type limonene (d-limonene) or l-type limonene (l-limonene) is used, and a detergent composition for a printed wiring board is emulsified by adding a predetermined amount of a surfactant thereto. A thing is also known (for example, patent document 2).
Also, a cleaning composition containing a predetermined amount of a terpene compound, a specific surfactant, a fluorosurfactant, and water, or an electronic component including a predetermined amount of a terpene compound and a surfactant. A cleaning composition is known (for example, Patent Documents 3 and 4).
Furthermore, a flux cleaning agent containing 30% by weight or more of fully hydrogenated terpenes and 10 to 70% by weight of a surfactant is also known (for example, Patent Document 5).
Japanese Patent Laid-Open No. 10-219291 JP-T 63-501908 Japanese Patent Laid-Open No. 3-212497 JP-A-3-212498 JP-A-6-228595

However, in any of the cleaning compositions for fluxes disclosed in Patent Documents 1 to 5, the amount of limonene used is too large, or the cleaning performance for flux adhering to electronic parts, solder processing devices, etc. is insufficient. Therefore, while the soldering process cannot be performed with high accuracy, there are problems that there are many volatile organic compounds and that they must be handled carefully as dangerous materials under the Fire Service Law.
Further, in any of the cleaning compositions for fluxes disclosed in Patent Documents 1 to 5, since a surfactant must be added in a relatively large amount, the surfactant is an object to be cleaned. There was also a problem that the dielectric properties of the object to be cleaned deteriorated easily remaining on electronic parts and substrates.

Thus, as a result of intensive studies, the inventors of the present invention have used a predetermined amount of limonene and a predetermined amount of an amine compound in combination, so that the main components are limonene and water, which are natural components. However, the present invention has been completed by finding out that it exhibits not only sufficient cleaning properties with respect to the flux but also that the content of volatile organic compounds can be reduced.
That is, the present invention is most suitable for cleaning electronic parts and solder processing devices to which flux is adhered, and considering the environmental problems, the cleaning properties of the flux are also made with limonene and water as the main components. It is an object of the present invention to provide a flux cleaning composition that is excellent in handling and processing properties and has a low content of volatile organic compounds, and a cleaning method using the same.

  According to the present invention, a flux cleaning composition comprising limonene, a surfactant and water, further comprising an amine compound, and the content of limonene is 1 to Provided is a flux cleaning composition having a value in the range of less than 40% by weight and a content of the amine compound in the range of 1 to 400 parts by weight with respect to 100 parts by weight of the limonene. The problems described above can be solved.

  Further, in constituting the flux cleaning composition of the present invention, it is preferable that the flash cleaning composition has a flash point of 40 ° C. or higher and a combustion point of 60 ° C. or higher.

In constituting the flux cleaning composition of the present invention, the content of volatile organic compounds (VOC) in the flux cleaning composition is preferably 20% by weight or less.
Such a volatile organic compound can be calculated roughly by defining it as an organic compound having a boiling point of 400 ° C. or lower.

  Moreover, when comprising the cleaning composition for fluxes of this invention, it is preferable to make content of water into the value within the range of 60 to 98 weight% with respect to the whole quantity.

In constituting the flux cleaning composition of the present invention, the amine value of the amine compound is preferably 100 mgKOH / g or more.
The amine value of the amine compound can be measured as an amount of potassium hydroxide (mg) equivalent to the hydrochloric acid required for neutralization titration with hydrochloric acid with respect to 1 g of the amine compound.

  Moreover, when comprising the cleaning composition for fluxes of this invention, it is preferable to make content of surfactant into the value within the range of 0.1 to 10 weight% with respect to the whole quantity.

Moreover, when comprising the flux cleaning composition of this invention, it is preferable to make the HLB value of surfactant into the value within the range of 8-15.
In addition, the HLB value of this surfactant can be calculated by the HLB calculation method of Griffin.

  Another embodiment of the present invention is a cleaning method using a flux cleaning composition containing limonene, a surfactant, and water, further containing an amine compound, and 100 parts by weight of limonene. On the other hand, a predetermined flux cleaning composition, wherein solder flux is removed using a flux cleaning composition in which the amine compound content is in the range of 1 to 400 parts by weight. Is a cleaning method using

  According to the cleaning composition for flux of the present invention, in a limonene-based cleaning composition, a predetermined amount of limonene and an amine compound are used together in a predetermined ratio, so that environmental pollution is small and natural ingredients such as limonene and water are used. Even if the main component remains as a main component, it not only exhibits sufficient cleaning properties against the flux, but the content of volatile organic compounds is reduced, and furthermore, it can be easily handled and processed. Can do.

  Further, according to the flux cleaning composition of the present invention, by setting the flash point and the combustion point of the flux cleaning composition to a value equal to or higher than a predetermined temperature, it can be handled as a non-hazardous material in the Fire Service Act. . Moreover, if it is a cleaning composition for flux of such a flash point or a combustion point, it can be heated appropriately in a washing | cleaning process, or storage conditions can also be eased in a storage process.

  Moreover, according to the cleaning composition for flux of the present invention, by making the content of the volatile organic compound in the cleaning composition for flux below a predetermined value, it is possible to effectively prevent the occurrence of environmental problems, As the aqueous detergent composition, the rinsing step can be omitted.

  Further, according to the flux cleaning composition of the present invention, by limiting the content of water to a predetermined range, the cleaning properties and emulsification degree of the flux cleaning composition, or flash point, combustion point, viscosity, Not only is it easy to adjust the physical properties such as pH value, but it can be used as an aqueous detergent composition containing a predetermined amount of surfactant, omitting the rinsing step, and handling it as a non-hazardous material under the Fire Service Act. .

  Further, according to the flux cleaning composition of the present invention, by setting the amine value of the amine compound to be used to a predetermined value, the cleaning properties of the flux cleaning composition to be obtained, physical properties such as flash point, etc. Not only is the adjustment easy, but the handling property of the amine compound itself is also good.

  In addition, according to the flux cleaning composition of the present invention, the surfactant residual problem can be effectively solved by limiting the surfactant content to a predetermined range, and the flux cleaning composition It becomes easier to adjust the physical properties such as the detergency and flash point.

  In addition, according to the flux cleaning composition of the present invention, by limiting the HLB value of the surfactant to a predetermined range, the flux cleaning composition can be handled as a nonionic surfactant. It becomes easier to adjust the physical properties such as the detergency and flash point.

Further, according to the cleaning method using the flux cleaning composition of the present invention, environmental pollution is reduced by using the flux cleaning composition in which a predetermined amount of limonene and an amine compound are used in a predetermined ratio. Even if the main component is limonene or water, which is a natural component, sufficient detergency for the flux can be exhibited.
Further, according to the cleaning method using the flux cleaning composition of the present invention, it is easy to adjust physical properties such as a flash point and a combustion point of the flux cleaning composition to be used. The agent composition can be handled or treated as a non-dangerous material under the Fire Service Law.

[First embodiment]
1st Embodiment is a cleaning composition for flux containing limonene, a surfactant, and water, and further contains an amine compound, and the content of limonene is based on the total amount, A cleaning composition for fluxes having a value within a range of less than 1 to 40% by weight and a content of an amine compound within a range of 1 to 400 parts by weight with respect to 100 parts by weight of limonene. .
In the description of the first embodiment, the flux cleaning composition itself is specifically described, and the object to be cleaned to which the flux cleaning composition is applied is described in the second embodiment. The cleaning method which is a form will be described.

1. Limonene (1) Type Limonene used in the flux cleaning composition of the first embodiment is an oily substance contained in a large amount in citrus peels and is a kind of terpene compound in a broad sense.
In the case where such limonene is a natural product, it is d-form as optical activity, so that it may be expressed as d-limonene in order to emphasize that it is an extract as a natural product.
Moreover, carcinogenicity and mutagenicity are not recognized regarding d-limonene, and FDA (US Food and Drug Administration) has certified GRAS15 (generally recognized as safe) as a food additive. Therefore, such limonene is harmless to the human body, has no environmental damage problems such as environmental pollution and ozone layer destruction, and has good microbial degradability and excellent processability. .
Regarding the type of limonene, in order to ensure long-term usability, some of the fully hydrogenated products and partially hydrogenated products obtained by hydrogenating unsaturated bonds contained in the constituent molecules of limonene are partially used. It is also preferable to use it.

(2) Content Further, the content of limonene is set to a value within the range of 1 to less than 40% by weight with respect to the total amount.
The reason for this is that when the content of limonene is less than 1% by weight, the cleaning effect on the flux may be significantly reduced. On the other hand, if the content of limonene exceeds 40% by weight, the amount of flammable liquid exceeds a predetermined amount, and therefore, it may be necessary to handle it as a dangerous material under the Fire Service Law.
Therefore, in consideration of the balance between the cleanability and the handleability, the limonene content is more preferably 3 to 20% by weight with respect to the total amount, preferably 5 to 15% by weight. More preferably, the value is within the range of%.

2. Surfactant (1) Type The surfactant used in the flux cleaning composition of the first embodiment is added to emulsify or solubilize the above-described limonene in water. Is added to improve the affinity for the object to be cleaned and, as a result, improve the cleaning property.
Here, as preferable examples of the surfactant, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polypropylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene which are nonionic surfactants are used. A single type of glycol fatty acid ester, polyoxyethylene alkylamine, polyoxyethylene benzyl alcohol, polyglycerin fatty acid ester, or a combination of two or more types may be mentioned.
In order to further improve emulsification or solubilization, anionic surfactants in the range of 0.1 to 10 parts by weight, for example soap, higher alcohol sulfate, with respect to 100 parts by weight of these nonionic surfactants. Salts, higher alkyl ether sulfates, sulfated oils, sulfated fatty acid esters, sulfated olefins, alkylbenzene sulfonates, alkyl naphthalene sulfonates, paraffin sulfonates, sulfosuccinic acid diesters, Igepon type, phosphate ester salts, etc. It is also preferable to add.

(2) HLB
The HLB of the surfactant is not particularly limited, but is preferably a value within the range of 8 to 15 because it can be used as a nonionic surfactant.
That is, limonene can be emulsified or solubilized in water by adding such a nonionic surfactant as a surfactant.

(3) Content Further, the content of the surfactant is preferably determined in consideration of the degree of emulsification of limonene, etc., for example, a value within the range of 0.1 to 10% by weight with respect to the total amount. It is preferable that
This is because when the content of the surfactant is less than 0.1% by weight, the degree of emulsification of limonene becomes insufficient and it may be easily separated from water. On the other hand, when the content of such a surfactant exceeds 10% by weight, the residual amount in the object to be cleaned increases, and a rinsing step becomes essential, or the electrical characteristics of the object to be cleaned are deteriorated. Because there is.
Accordingly, in consideration of the balance between the emulsifiability and the persistence, the content of the surfactant is more preferably set to a value within the range of 0.5 to 8% by weight with respect to the total amount. More preferably, the value is in the range of 1 to 5% by weight.

3. Water used for the flux cleaning composition according to the first embodiment may be used for the cleaning properties and emulsification degree of the flux cleaning composition, or the physical properties such as flash point, combustion point, viscosity, pH value, etc. It is added for adjustment, for the omission and simplification of the rinsing process, and for ensuring handling as a non-hazardous material under the Fire Service Law.
Here, the content of water is preferably determined in consideration of the degree of emulsification of limonene, handleability, and the like. For example, the water content is preferably set to a value in the range of 60 to 98% by weight with respect to the total amount. .
The reason for this is that if the water content falls below 60% by weight, it may fall under the category of dangerous goods under the Fire Service Act, or the viscosity of the cleaning composition may increase, making handling difficult. Because there is. On the other hand, if the content of water exceeds 98% by weight, the cleaning performance of the flux as the object to be cleaned may be significantly reduced.
Therefore, in consideration of the balance between the handleability and the washability, the water content is more preferably set to a value within the range of 70 to 95% by weight, based on the total amount, 80 to 90 More preferably, the value is within the range of% by weight.

4). Type of amine compound (1) The amine compound is a compound added for the purpose of adjusting the detergency and emulsification degree of the flux cleaning composition, or the physical properties such as the flash point, combustion point, viscosity, and pH value.
Here, the type of amine compound is not particularly limited as long as it matches the purpose of addition, but preferred examples include 2-amino-2-methyl-1-propanol and 2-amino-2-ethyl. -1-propanol, aminomethylpropanediol, aminoethylpropanediol, aminobutanol, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylmonoethanolamine, N-ethylmonoethanolamine, N-propylmonoethanolamine, N-butylmonoethanolamine, N-cyclohexylmonoethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, N-propyldiethanolamine, N-butyldie Nolamine, N-cyclohexyldiethanolamine, N-cyclohexyldimethanolamine, N, N-dimethylmonoethanolamine, N, N-diethylmonoethanolamine, N, N-dipropylmonoethanolamine, N, N-dibutylmonoethanolamine N, N-dicyclohexylmonoethanolamine, lauryldimethylamine, myristyldimethylamine, coconut alkyldimethylamine, cetyldimethylamine, beef tallow alkyldimethylamine, stearyldimethylamine, stearyldihydroxyethylamine, N-lauroylamidopropyl-N′-dimethyl A single type of amine, N-myristoylamidopropyl-N′-dimethylamine, triethylamine, trimethylamine, or a combination of two or more types may be mentioned. The

In addition, it is more preferable to use an amino alcohol having a cyclo ring structure introduced, because the emulsification degree with respect to limonene is better and the odor is less. That is, N-cyclohexyldiethanolamine, N-cyclohexyldimethanolamine and the like are suitable.
Furthermore, among these amine compounds, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1-propanol, diethanolamine, triethanolamine, N-methyldiethanolamine, and N-cyclohexyldiethanolamine are: It is a more preferred aminoalcohol because it is relatively inexpensive and exhibits excellent detergency when the flux is washed only by adding a relatively small amount.

It is also preferable to select the type of amine compound from the amine value. That is, it is preferable to select an amine compound having an amine value of 100 mgKOH / g or more.
This is because when the amine value of the amine compound to be used is less than 100 mgKOH / g, when the cleaning composition for flux is constituted, the cleaning property is extremely lowered, and the flux is sufficiently cleaned in a short time. This may be difficult.
On the other hand, if the amine value of the amine compound is excessively high, the flammability becomes high, and it may be difficult to handle the resulting flux cleaning composition or the cleaning temperature may be excessively decreased. is there.
Therefore, it is more preferable to select an amine compound having an amine value of 150 to 1000 mgKOH / g, and it is more preferable to select an amine compound having an amine value of 200 to 800 mgKOH / g.

It is also preferable to select the type of amine compound from its boiling point. That is, it is preferable to select an amine compound having a boiling point of 120 to 400 ° C.
The reason for this is that when the boiling point of such an amine compound is less than 120 ° C., the flammability becomes high and handling of the resulting flux cleaning composition becomes difficult or the cleaning temperature is not excessively lowered. This is because there is a case where it is not possible.
On the other hand, when the boiling point of the amine compound exceeds 400 ° C., it may be difficult to sufficiently wash the flux in a short time.
Therefore, it is more preferable to select an amine compound having a boiling point of 160 to 370 ° C.

(2) Content 1
Moreover, it is preferable to make content of an amine compound into the value within the range of 0.1 to 35 weight% with respect to the whole quantity.
The reason for this is that when the content of the amine compound is less than 0.1% by weight, the reactivity with the acid substance contained in the flux or the like decreases, and as a result, the cleaning effect on the flux decreases remarkably. Because there is. On the other hand, if the content of the amine compound exceeds 35% by weight, the cleaning effect on the flux may be reduced, or the substrate of the electronic component that is the adherend of the object to be cleaned may be eroded. It is.
Therefore, in consideration of the balance between the detergency and the erodibility, the content of the amine compound is more preferably set to a value within the range of 0.5 to 20% by weight with respect to the total amount. More preferably, the value is within the range of 1 to 15% by weight.

Here, with reference to FIGS. 1-2, the influence of the content of the amine compound on the pH value and the detergency evaluation in the cleaning composition for flux will be described in detail. In addition, 2-amino-2-methyl-1-propanol will be described as an example of an amine compound.
FIG. 1 is a diagram for explaining the influence of the amine compound content on the pH value in the flux cleaning composition. The horizontal axis shows the amine compound content (% by weight) relative to the total amount. The pH value (-) is shown on the vertical axis. As can be easily understood from FIG. 1, the higher the amine compound content, the higher the pH value tends to be obtained, and the change is particularly large in the range of 0.1 to 10% by weight. After that, the pH value tends to increase little by little. More specifically, when the amine compound content is 1% by weight, the pH value is about 10.8, and when 5% by weight, the pH value is about 11.6 and 10% by weight. In some cases, the pH value is about 11.9, and at 20% by weight, the pH value is about 12.2.
Therefore, it is understood that the pH value in the flux cleaning composition can be changed by appropriately changing the content of the amine compound.
In addition, it is clear from the result of FIG. 3 mentioned later that the pH value in the cleaning composition for flux is closely related to the evaluation of cleaning properties.

FIG. 2 is a diagram illustrating the influence of the amine compound content on the number of cleanings in the flux cleaning composition. The horizontal axis represents the amine compound content (wt%) relative to the total amount. ), And the vertical axis indicates the number of times of cleaning (−) until two types of fluxes (flux 1 and flux 2) can be completely cleaned. As can be easily understood from FIG. 2, as the content of the amine compound is larger, the number of times of washing with respect to the two kinds of fluxes tends to be reduced, particularly in the range of 0.1 to 5% by weight. The change is large, and after that, the number of washings tends to decrease little by little. More specifically, when the amine compound content is 0.5% by weight, the number of cleaning times for the flux 1 is 180 times and the number of cleaning times for the flux 2 is 110 times. When the content of the amine compound is 5% by weight, the number of cleaning times for the flux 1 is 90 times, and the number of cleaning times for the flux 2 is 60 times.
Therefore, it is understood that the number of cleanings with respect to the flux, that is, the cleaning property, can be greatly changed by appropriately changing the content of the amine compound in the flux cleaning composition.
The amine compound content affects the pH value or amine value of the flux cleaning composition, and as a result, affects the cleaning properties of the flux cleaning composition, as shown in FIGS. It is clear that you are doing.

(3) Content 2
Moreover, it is preferable to determine the content of the amine compound in consideration of the content of limonene. That is, it is preferable to set the content of the amine compound to a value within the range of 1 to 400 parts by weight with respect to 100 parts by weight of limonene.
This is because when the content of the amine compound is less than 1 part by weight, the cleaning properties of the flux cleaning composition may be significantly reduced. On the other hand, if the content of the amine compound exceeds 400 parts by weight, it may be necessary to handle it as a hazardous material under the Fire Service Law, or the viscosity of the cleaning composition may increase, making it difficult to handle. Because there is.
Accordingly, the content of the amine compound is more preferably set to a value within the range of 10 to 350 parts by weight, and further preferably set to a value within the range of 30 to 300 parts by weight with respect to 100 parts by weight of limonene. .

5). Additives In addition, the detergent composition for flux in the first embodiment has higher alcohols, glycol ethers, rust preventives, antiseptics, antioxidants, antifoaming agents, etc., as long as the effects are not impaired. Can be added.

6). Physical Properties (1) Flash Point and Combustion Point It is preferable that the flash point of the flux cleaning composition is 40 ° C. or higher.
The reason for this is that when the flash point of such a flux cleaning composition is less than 40 ° C., it must be handled with care as a hazardous material under the Fire Service Law.
However, if the flash point of the flux cleaning composition is excessively high, the amount of limonene that can be used and the type of amine compound may be excessively limited.
Accordingly, the flash point of the flux cleaning composition is more preferably set to a value within the range of 45 to 200 ° C, and further preferably set to a value within the range of 50 to 100 ° C.
Moreover, it is preferable that the combustion point of the flux cleaning composition is 60 ° C. or higher.
The reason for this is that when the burning point of such a cleaning composition for flux is less than 60 ° C., it must be carefully handled as a dangerous substance under the Fire Service Law.
However, if the burning point of the flux cleaning composition is excessively high, the amount of limonene that can be used and the type of amine compound may be excessively limited.
Therefore, the burning point of the flux cleaning composition is more preferably set to a value within the range of 80 to 250 ° C, and further preferably set to a value within the range of 100 to 150 ° C.

(2) Volatile organic compound Moreover, it is preferable that content of the volatile organic compound (VOC) in the cleaning composition for fluxes shall be 20 weight% or less.
The reason for this is that if the content of the volatile organic compound in the cleaning composition for flux exceeds 20% by weight, an environmental problem occurs, a specific processing device is required, and further, an aqueous cleaning is performed. This is because it may be difficult to handle as an agent composition.
However, if the content of the volatile organic compound in the flux cleaning composition is excessively reduced, the type and content of usable amine compounds may be excessively limited.
Accordingly, the content of the volatile organic compound in the flux cleaning composition is more preferably set to a value within the range of 0.5 to 15% by weight, and the value within the range of 1 to 10% by weight. Is more preferable.

(3) pH value Moreover, it is preferable to make pH value of the cleaning composition for flux into 10 or more values.
This is because when the pH value is less than 10, the cleaning effect on the flux may be significantly reduced.
However, if the pH value of the flux cleaning composition becomes excessively large, the substrate of the electronic component that is the object to be cleaned may be affected.
Accordingly, the pH value of the flux cleaning composition is more preferably set to a value within the range of 10.5 to 13, and more preferably set to a value within the range of 11 to 12.

Here, with reference to FIG. 3, the relationship between the pH value in the cleaning composition for flux and the cleaning performance evaluation (number of cleanings) for each of the two types of fluxes (flux 1 and flux 2) is specifically described. To do.
FIG. 3 is based on data of Examples and Comparative Examples described later. The horizontal axis indicates the pH value (−) in the flux cleaning composition, and the vertical axis indicates two values. The cleaning performance evaluation (number of times) until the types of fluxes (flux 1 and flux 2) can be completely cleaned is shown. As can be easily understood from FIG. 3, the higher the pH value of the flux cleaning composition, the smaller the number of times of cleaning with respect to the two types of flux, and in particular, the pH value ranges from 10 to 11. , The number of cleanings is significantly reduced, and thereafter the number of cleanings tends to decrease little by little.
Therefore, it is understood that the number of cleanings with respect to the flux, that is, the cleaning property can be greatly changed by appropriately changing the pH value in the flux cleaning composition.
One means for changing the pH value in the flux cleaning composition is the content of the amine compound and the type of amine compound used (amine value).

(4) Amine value Moreover, it is preferable to make the amine value of the cleaning composition for flux into the value of 1 mgKOH / g or more.
This is because when the amine value is less than 1 mg KOH / g, the cleaning effect on the flux may be significantly reduced.
However, if the amine value of such a cleaning composition for flux becomes excessively large, it may damage the substrate of electronic parts that are the objects to be cleaned, and the cost will increase. This is because it may fall under.
Accordingly, the amine value of the flux cleaning composition is more preferably set to a value within the range of 10 to 250 mgKOH / g, and further preferably set to a value within the range of 20 to 200 mgKOH / g.

Here, with reference to FIG. 4, the relationship between the amine value (mgKOH / g) in the cleaning composition for flux and the detergency evaluation (number of times) for two types of fluxes (flux 1 and flux 2) is concrete. Explained.
FIG. 4 is based on data of Examples and Comparative Examples described later, and the horizontal axis indicates the amine value (mgKOH / g) in the flux cleaning composition, and the vertical axis indicates. The cleaning performance evaluation (number of times) until two types of fluxes (flux 1 and flux 2) can be completely cleaned is shown. As can be easily understood from FIG. 4, the higher the amine value of the flux cleaning composition, the smaller the number of cleaning times for the two types of flux, and in particular, the amine value ranges from 10 to 50. , The number of cleanings is remarkably reduced, and thereafter, there is a tendency that the number of cleanings is almost constant.
Therefore, it is understood that by changing the amine value in the cleaning composition for flux within a predetermined range, the number of cleanings with respect to the flux, that is, the cleaning property, can be greatly changed.
One means for changing the amine value in the flux cleaning composition is the content of the amine compound and the type of amine compound used (amine value).

(5) Electric conductivity Moreover, it is preferable to make the electric conductivity (room temperature) of the cleaning composition for flux into a value within the range of 10 to 2,000 μS / cm.
The reason for this is that when the electrical conductivity is less than 10 μS / cm, the cleaning effect on the flux may be significantly reduced. On the other hand, if the electrical conductivity exceeds 2,000 μS / cm, the electronic component or the substrate that is the object to be cleaned may be affected.
Therefore, the electric conductivity of the flux cleaning composition is more preferably set to a value within the range of 50 to 1,500 μS / cm, and further preferably set to a value within the range of 100 to 1,000 μS / cm. .

[Second Embodiment]
The second embodiment is a cleaning method using a cleaning composition for flux containing limonene, a surfactant, and water, further containing an amine compound, and 100 parts by weight of limonene. A predetermined flux cleaning composition characterized in that solder flux is removed using a flux cleaning composition in which the amine compound content is in the range of 1 to 400 parts by weight. Cleaning method.

1. Cleaning method In carrying out the cleaning method using the flux cleaning composition, the cleaning method is not particularly limited. For example, a dipping method, a rocking method, an ultrasonic vibration method, a shower cleaning method, Various means such as a jet method can be employed. It is also preferable to clean the flux in a state where the cleaning composition for flux is impregnated or adhered to a brush, a cleaning roll or the like.
In carrying out the cleaning method using the flux cleaning composition, more specifically, it is preferable to use a cleaning device described later.

2. Cleaning conditions Moreover, when implementing the cleaning method using the flux cleaning composition, it is preferable to perform cleaning under conditions of, for example, 5 to 80 ° C. and 1 second to 30 minutes.
The reason for this is that if a predetermined cleaning effect is obtained under such conditions, it is possible to effectively prevent thermal deterioration and oxidation deterioration of the flux cleaning composition itself.
In particular, when the cleaning composition for flux contains a predetermined amount of limonene, cleaning is performed under conditions of 5 to 45 ° C. and 1 second to 30 minutes, considering that the flash point of limonene is 47.5 ° C. It is preferable to do.

3. Rinsing Step Further, in carrying out the cleaning method using the flux cleaning composition, it is preferable to provide a further rinsing step to rinse the cleaned electronic component or substrate.
This is because, when the flux cleaning composition remains, electrical corrosion or the like may occur in the electronic component or the substrate.
Here, it is preferable to use an alcohol solvent as the rinse liquid. This is because, compared with water, it can be dried quickly, and limonene and amine compounds can be sufficiently removed.
More specifically, as alcohol solvents, methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, t-butyl alcohol, s-butyl alcohol, amyl alcohol, 1-methoxy-2- It is preferable to use one kind of alcohol such as propanol or two or more kinds of alcohols.
In addition, it is preferable to use an alcohol solvent in which a predetermined amount of water is added to these alcohols, and more specifically, water is added so as to be 40% by weight to 70% by weight with respect to the total amount. It is preferable to use an added alcohol solvent.
In addition, as rinse conditions, it is more preferable to carry out the rinse process in two steps within the range of 5-40 degreeC and 1 second-30 minutes. The reason for this is to reduce the amount of surfactant and amine compound residue.
However, when removing the flux adhering to the solder processing equipment, etc., there is no problem of corrosion of electronic parts and substrates due to the remaining surfactant, etc., so that the rinsing process may be omitted or simplified. it can.

4). Cleaning Device When performing the cleaning method using the flux cleaning composition, the flux cleaning device 10 used is a cleaning device including an ultrasonic vibrator 29 for ultrasonic cleaning as shown in FIG. It is preferable to include a tank 12, a circulation path 22, a liquid feed pump 24, a rinse tank 14, and a drying tank 16.
More specifically, the cleaning tank 12 includes a container (cleaning liquid) 20 for the object to be cleaned 23, an ultrasonic vibrator 29, a cleaning liquid stirring device (not shown), a heater 19 with a thermostat, and a cleaning liquid. It is preferable that the object to be cleaned 23 is efficiently cleaned by applying ultrasonic vibration to the cleaning liquid 21 which is constituted by a circulation path 22 for circulating the gas 21 and is stirred and circulated. Next, in the rinsing tank 14, it is preferable to further remove the flux and the like from the object 23 to be cleaned, remove the cleaning liquid 21, and further evaporate the rinsing liquid 15 and the like in the drying tank 16.
That is, by using such a cleaning apparatus 10, the flux cleaning agent composition of the present invention is used to clean soldered electronic components and substrates and efficiently remove the flux adhering to them. Can be removed.

5). Object to be cleaned 1
In carrying out the cleaning method using the flux cleaning composition, the type of the object to be cleaned to which the flux cleaning composition is applied is not particularly limited, but soldered electronic components and substrates are not limited. Of course, even if the soldering process is not performed, a component having an influence of flux can be suitably used. Therefore, for example, printed circuit boards, ceramic wiring boards, semiconductor elements (including semiconductor parts such as BGA, CSP, PGA, LGA), semiconductor element mounting boards, TAB tapes with bumps, TAB tapes without bumps, TABs with semiconductor elements Specific examples include a tape, a lead frame, a capacitor, and a resistor.
In these objects to be cleaned, the type of flux used is not particularly limited. For example, not only ordinary solder flux but also low VOC flux, lead-free solder flux, or high melting point solder. It is preferably a flux or a no-clean solder flux. That is, these solder fluxes usually have rosin as a main component, and include organic acid salts, glycidyl ether compounds, oxyacids, carboxylic acids (including dicarboxylic acids), anilides and thermosetting resins (for example, epoxy resins and This is because at least one compound of thermosetting acrylic resin) is often added. Therefore, if it is the cleaning composition for fluxes of this invention, it can show the outstanding washing | cleaning property also to these solder fluxes as well as normal solder flux.
There are no particular restrictions on the types of solder such as ordinary solder, high melting point solder, lead-free solder, and no-clean solder to which flux is added. For example, Sn-Ag, Sn-Ag-Cu Typical examples include Sn, Sn—Cu, Sn—Zn, Sn—Bi, and Pb—Sn.

6). Object to be cleaned 2
In addition to the electronic components and substrates described above, the type of the object to be cleaned includes the solder processing apparatus itself in a state where the flux adheres.
For example, the solder processing apparatus 100 shown in FIG. 6 and the spray fluxer 103 included in the solder processing apparatus 100 may be mentioned. As shown in a partially enlarged view in FIG. 7, the spray fluxer 103 includes a spray processing unit (not shown) for spraying the flux on the substrate 108 and a belt for transporting the substrate 108 while gripping it. Nail 106 arranged in a shape, a plurality of rolls 112a, 112b, 112c, 112d for driving and controlling the direction of the nail 106, and a flux for cleaning the nail 106 The cleaning unit 114 is preferably configured.
In the spray fluxer 103, as shown by an arrow in FIG. 8, the claw portion 106 is normally rotated while holding the substrate 108, and the flux cleaning composition is applied in the middle thereof. It is preferable that a brush 110 is provided. In the example of the spray fluxer 103, a plurality of brushes 110 are arranged, and the upper brush is used to clean the flux by sufficiently applying the flux cleaning composition to the front and back surfaces of the claw portion 106. 110a and a lower brush 110b are provided.

  Hereinafter, the present invention will be described in detail with reference to examples. Needless to say, the scope of the present invention is not limited to the following description.

[Example 1]
1. Adjustment and Evaluation of Cleaning Agent (1) pH Value As shown in the composition of Example 1 in Table 1, limonene (d-limonene) and N-cyclohexyldiethanolamine (amine value: 300 mgKOH / g) , 2-amino-2-methyl-1-propanol (amine value: 630 mg KOH / g, concentration: 90 wt%), polyoxyethylene oleyl ether, and water are contained in predetermined amounts and stirred sufficiently to be uniform. After adjusting the flux cleaning composition, the pH value was measured using a pH meter.

(2) Amine value As described above, the flux cleaning composition having the composition of Example 1 was prepared, and the amine value was measured by a titration method.

(3) Detergency evaluation One drop of each of two types of fluxes (flux 1 and flux 2) was dropped on the prepared glass. Subsequently, it heated for 10 minutes using 105 degreeC oven, and produced two types of test pieces. Next, 20 g of the flux cleaning composition of Example 1 was placed in a 50 ml beaker, and then the test pieces were immersed therein. In this state, the beaker was swung back and forth, and the number of times until the flux adhering to the test piece could be completely cleaned was measured to evaluate the cleaning performance.

[Examples 2 to 10]
In Examples 2 to 7, the cleaning composition shown in Table 1 was prepared by changing the blending ratio of 2-amino-2-methyl-1-propanol as an amine compound with respect to limonene, and the same as in Example 1 The pH value and the detergency were measured and evaluated.
Further, in Examples 8 to 10, the blending ratio of N-cyclohexyldiethanolamine as an amine compound with respect to limonene was changed, and 2-amino-2-methyl-1-propanol was not added, and further, a polysiloxane as a surfactant was added. A cleaning composition having a composition as shown in Table 1 was prepared by changing the blending ratio of oxyethylene ether, and the pH value and detergency were measured and evaluated in the same manner as in Example 1.

[Example 11]
In Example 11, the addition ratio of 2-amino-2-methyl-1-propanol and polyoxyethylene ether as a surfactant was changed without adding N-cyclohexyldiethanolamine as an amine compound. A cleaning composition having a composition as shown in FIG. 1 was prepared, and in the same manner as in Example 1, the pH value and the detergency were measured and evaluated.

[Comparative Example 1]
In Comparative Example 1, a cleaning composition shown in Table 1 was prepared and added without adding N-cyclohexyldiethanolamine and 2-amino-2-methyl-1-propanol as amine compounds to limonene. In the same manner as in Example 1, the pH value and detergency were measured and evaluated.
As a result, in Comparative Example 1, since a predetermined amount of the amine compound was not added, an evaluation result that the detergency was extremely insufficient was obtained.

According to the flux cleaning composition and the cleaning method using the same according to the present invention, the combination of a predetermined amount of limonene and an amine compound while containing mainly natural components of limonene and water, While excellent detergency can be exhibited with respect to the flux adhering to parts, solder processing equipment, etc., the handleability and disposability of the flux cleaning composition are significantly improved.
Therefore, not only can soldering be performed accurately and inexpensively on electronic components that require high reliability, substrates such as high-frequency circuit boards, etc., but also for the flux after cleaning while considering environmental issues. The cleaning composition can be processed economically and easily.

It is a figure provided in order to demonstrate the influence which it has on the pH value in the cleaning composition for fluxes of an amine compound (2-amino-2-methyl-1-propanol). It is a figure provided in order to demonstrate the influence which it has on the cleaning property evaluation in the cleaning composition for fluxes of an amine compound (2-amino-2-methyl-1-propanol). It is a figure provided in order to demonstrate the relationship between pH value in a cleaning composition for fluxes, and cleaning property evaluation. It is a figure provided in order to demonstrate the relationship between the amine value in a cleaning composition for fluxes, and cleaning property evaluation. It is a figure provided in order to demonstrate an example of a washing | cleaning apparatus. It is a figure provided in order to demonstrate an example of a solder processing apparatus. It is an enlarged view provided in order to demonstrate the spray plaquer in a solder processing apparatus. It is a figure provided in order to demonstrate the motion of the nail | claw part in the spray plaquer in a solder processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Cleaning apparatus 12: Cleaning tank 14: Rinse tank 15: Rinse liquid 16: Drying tank 21: Cleaning liquid 22: Circulation path 28: Filter 100: Solder processing apparatus 102: Work table 103: Spray fluxer 103
104: Solder processing unit 106: Claw unit 108: Substrate 110: Brush 112: Roll 114: Cleaning unit

Claims (8)

  A flux cleaning composition comprising limonene, a surfactant, and water, further comprising an amine compound, and the content of the limonene is less than 1 to 40% by weight based on the total amount A flux cleaning composition characterized by having a value within the range and a content of the amine compound within a range of 1 to 400 parts by weight with respect to 100 parts by weight of the limonene.   The flux cleaning composition according to claim 1, wherein the flash cleaning composition has a flash point of 40 ° C or higher and a combustion point of 60 ° C or higher.   The flux cleaning composition according to claim 1 or 2, wherein the content of the volatile organic compound (VOC) in the cleaning composition for flux is 20% by weight or less.   The flux cleaning composition according to any one of claims 1 to 3, wherein the water content is set to a value within a range of 60 to 98 wt% with respect to the total amount.   The flux cleaning composition according to any one of claims 1 to 4, wherein the amine value of the amine compound is 100 mgKOH / g or more.   The flux cleaning according to any one of claims 1 to 5, wherein the content of the surfactant is set to a value within a range of 0.1 to 10 wt% with respect to the total amount. Agent composition.   The flux cleaning composition according to any one of claims 1 to 6, wherein the surfactant has an HLB value in the range of 8 to 15.   A cleaning method using a flux cleaning composition comprising limonene, a surfactant, and water, further containing an amine compound, and the content of the amine compound relative to 100 parts by weight of the limonene A cleaning method using a flux cleaning composition, wherein solder flux is removed using a flux cleaning composition having a value in the range of 1 to 400 parts by weight.