JP2002241796A - Solvent composition for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solvent composition for cleaning, having excellent cleaning power and containing 1,1,1,3,3-pentafluorobutane as a main component. SOLUTION: This solvent composition is produced by mixing 1,1,1,3,3- pentafluorobutane with n-propyl bromide, isopropyl bromide, nitromethane, nitroethane, d-limonene or 3-methoxy butyl acetate. The composition may further contain at least one kind of solvent selected from >=5C alkanes, >=5C cycloalkanes and alcohols.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to 1,1,1,3,
The present invention relates to a solvent composition for cleaning containing 3-pentafluorobutane as a main component, and more particularly to a technique for improving the cleaning ability.

[0002]

2. Description of the Related Art Conventionally, chlorine-based solvents and fluorine-based solvents have been widely used as flux cleaners, dry cleaning solvents, degreasing cleaners, buffing cleaners, resist strippers or solvents for removing adhering water. However,
The use of chlorinated solvents as a causative substance for groundwater pollution and of the fluorinated solvents as a causative substance for destruction of the ozone layer are being suppressed due to environmental problems. Therefore,
There is a demand for a new solvent in place of such a solvent.

One of them is 1,1,1,3,3-pentafluorobutane (365 mfc, chemical formula: C ₄ H ₅ F ₅ ).
(JP-A-5-171189, JP-A-5-171)
No. 190, JP-A-6-322394, JP-A-7-18
No. 8700). 1,1,1,3,3-pentafluorobutane does not contain chlorine in its molecular structure, has an ozone depletion potential (ODP) of 0, is less toxic, has a lower global warming potential (GWP), and is environmentally friendly. It has an excellent feature of being gentle and clean.

[0004]

However, 1,
1,1,3,3-pentafluorobutane (365 mf
In (c), there was a problem that the KB value (kauributanol value) was extremely low at about 14, and there was almost no degreasing ability. When the KB value is low, various cleaning agents cannot exhibit sufficient cleaning ability.

[0005] Therefore, 1,1,1,3,3-pentafluorobutane is compared with methylene chloride or 1,1-dichloro-1-fluoroethane (HCFC141b) having a degreasing detergency having a higher KB value than this. It has been proposed to improve the cleaning ability by mixing water (Japanese Patent Laid-Open No. 5-17 / 1993).
No. 1185 and JP-A-11-152236).

[0006] However, methylene chloride is not preferable in use because it is highly toxic and may cause a bad influence on the human body at the time of work, and its use is becoming more difficult in the future. In addition, 1,1-dichloro-1-fluoroethane (141b) has a high ozone depletion potential and may be subject to regulation in the future.

[0007] The present invention has been made in view of such circumstances, and an object thereof is to provide a cleaning ability containing 1,1,1,3,3-pentafluorobutane as a main component, particularly a degreasing cleaning ability. An object of the present invention is to provide a cleaning solvent composition which is excellent in cleaning.

[0008]

In order to achieve the above object, the first cleaning solvent composition according to the present invention comprises (a) 1,1,1,3,3-pentafluoro It is characterized by containing 30-80% by weight of butane and (b) 20-70% by weight of normal propyl bromide and / or isopropyl bromide (Claim 1).

Normal propyl bromide (alias: n-
Propyl bromide, 1-bromopropane. NPB) and isopropyl bromide (also known as isopropyl bromide or 2-bromopropane, hereinafter referred to as IPB) are suitable solvents for increasing the cleaning ability of 1,1,1,3,3-pentafluorobutane. It was found as. These NPB and IPB have a relatively high KB value of 125, and are excellent in degreasing and cleaning. Moreover,
Like 1,1,1,3,3-pentafluorobutane, it is nonflammable and has non-flammable or non-flammable properties. Contains no chlorine or fluorine and has an ozone depletion potential (O
DP) and global warming potential (GWP) are small, and have excellent characteristics of being environmentally friendly and clean.

NPB and / or IP having a high KB value
By mixing B with 1,1,1,3,3-pentafluorobutane, the cleaning performance, particularly the degreasing cleaning performance, can be significantly increased, and sufficient performance can be exhibited as various cleaning agents. . In addition, since it is not flammable as in the prior art, it does not correspond to a dangerous substance and is safe and easy to handle. In addition, it has low ozone depletion potential (ODP) and global warming potential (GWP), and is environmentally friendly and clean.

1,1,1,3,3-pentafluorobutane is 30 to 80% by weight, and NPB and / or IPB is 20% by weight.
NPB and / or IPB
If the content of is too small, the cleaning ability does not improve much,
This is because a sufficient cleaning effect cannot be obtained. Further, if the content of NPB and / or IPB is too large, the characteristics of NPB and / or IPB will appear significantly,
This is because the dissolving power is excessively improved, and the excellent characteristics of 1,1,1,3,3-pentafluorobutane cannot be fully utilized. By ensuring that the content of 1,1,1,3,3-pentafluorobutane is at least 30% by weight, it is possible to exhibit its characteristics.

In the second cleaning solvent composition according to the present invention, (a) 15-77% by weight of 1,1,1,3,3-pentafluorobutane and (b) normal propyl 20 parts of bromide and / or isopropyl bromide
(C) 3 to 15 weight% of one or more solvents selected from alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols.
% By weight (claim 2).

At least one solvent selected from alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols is mixed with 1,1,1,
This is for reducing the content of 3,3-pentafluorobutane and dissolving water-soluble inorganic substances and the like contained in fluxes and the like that cannot be sufficiently dissolved with normal propyl bromide and / or isopropyl bromide. 1,1,1,3,3-Pentafluorobutane is also very expensive, and if used in large quantities, could lead to a significant price increase. As a result, a significant price increase can be avoided.

The reason why the content of these solvents is 3% by weight or more is to sufficiently dissolve water-soluble inorganic substances and the like contained in the flux and the like. The reason why the content of these solvents is set to 15% by weight or less is that these solvents become flammable and correspond to dangerous substances, so that if they are mixed in a large amount, they become flammable substances.

In the third cleaning solvent composition according to the present invention, (a) 30 to 70% by weight of 1,1,1,3,3-pentafluorobutane, (b) nitromethane, nitroethane, One or more solvents selected from d-limonene and 3-methoxybutyl acetate or a mixture of two or more solvents are contained in an amount of 30 to 70% by weight (claim 3).

Nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate are suitable for the present inventors to enhance the cleaning ability of 1,1,1,3,3-pentafluorobutane with NPB and IPB. It was found as a solvent. Although these must be mixed more than NPB and IPB, sufficient performance can be obtained as the degreasing and cleaning ability.

1,1,1,3,3-pentafluorobutane in an amount of 30 to 70% by weight, nitromethane, nitroethane,
One or a mixture of two or more solvents selected from d-limonene and 3-methoxybutyl acetate
The reason why the content is set to 0 to 70% by weight is that, like NPB and IPB, if the content is too small, the cleaning ability is not sufficiently increased, so that a sufficient cleaning effect cannot be obtained and the content is too large. This is because the characteristics of nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate appear greatly, and the excellent characteristics of 1,1,1,3,3-pentafluorobutane cannot be utilized.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the cleaning solvent composition according to the present invention will be described below. The cleaning solvent composition according to the present invention is of the following three types.

[1] (a) 30 to 80% by weight of 1,1,1,3,3-pentafluorobutane and (b) 20 to 70% by weight of normal propyl bromide and / or isopropyl bromide.

[2] (a) 27 to 80% by weight of 1,1,1,3,3-pentafluorobutane, (b) 20 to 70% by weight of normal propyl bromide and / or isopropyl bromide, (c) One type of solvent selected from alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols or a mixed solvent of two or more types
-15% by weight.

[3] (a) 30% to 70% by weight of 1,1,1,3,3-pentafluorobutane, (b) selected from nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate 30 to 70% by weight of one type of solvent or a mixed solvent of two or more types.

Here, normal propyl bromide (N
One of PB) and isopropyl bromide (IPB) may be used alone, or both may be used. For NPB and IPB,
Since a metal reacts easily with aluminum or its alloys, at least one substance selected from the group consisting of nitroalkanes, ethers, epoxides and amines is added as a stabilizer in a trace amount or a small amount to prevent this reaction. Good to be. In the cleaning solvent, NP
In order to suppress the odor of B, a small amount or a small amount of a fragrance such as d-limonene is preferably added.

Similarly, when 1,1,1,3,3-pentafluorobutane is used for cleaning in a heated state or with steam, the object to be cleaned is iron, zinc, aluminum, copper, brass or the like. And nitro compounds, phenols, amines, ethers, amylenes, epoxides, or triazoles. It is preferred to add. Specific examples of the stabilizer include the following. Epoxides such as propylene oxide, 1,2-butylene oxide, and glycidol; phosphites such as dimethyl phosphite, diisopropyl phosphite and diphenyl phosphite; thiophosphites such as trilauryl trithiophosphite; triphenoxy phosphine sulfide; Phosphine sulfides such as trimethylphosphine sulfide; boric acid,
Boron compounds such as triethyl borate, triphenyl borate, phenylboronic acid, diphenylboronic acid;
Phenols such as 2,6-di-tert-butylparacresol; nitroalkanes such as nitromethane and nitroethane; acrylates such as methyl acrylate and ethyl acrylate; other dioxane and tert
-Butanol, pentaerythritol, paraisopropenyltoluene. The addition amount of these stabilizers is not particularly limited, but is preferably set to about 0.01 to 5% by weight of the total amount of the cleaning solvent composition.

On the other hand, the alkane having 5 or more carbon atoms and the cycloalkane having 5 or more carbon atoms mixed in the cleaning solvent composition [2] include pentane, 2-methylbutane,
2,2-dimethylpropane, hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane,
2,3-dimethylbutane, heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane,
2,4-dimethylpentane, octane, 2,2,3-trimethylpentane, 2,2,4-trimethylpentane,
Examples include, but are not limited to, cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, and the like. Moreover, as alcohols, methanol, ethanol, i-propanol,
n-propanol, n-butanol, i-butanol,
There are s-butanol, t-butanol and the like. These alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols may be mixed with one kind of solvent, or may be mixed with two or more kinds of mixed solvents.

Also, nitromethane, nitroethane, d-
As for limonene and 3-methoxybutyl acetate, at least one kind of solvent among them may be mixed, and of course, two or more kinds of these may be mixed.

The main uses of the solvent composition for cleaning according to the present invention are as follows: resist remover, flux cleaner, degreasing cleaner such as oils and fats, buffing cleaner, solvent for dry cleaning, grease, oil, wax・ Removing agent for ink etc.
Solvents for paints, extractants, various articles made of glass, ceramics, rubber, and metal, particularly, IC parts, electrical equipment, precision equipment, cleaning agents for optical lenses, etc., drainers, and the like.

The cleaning methods to which the cleaning solvent composition according to the present invention can be applied include hand wiping, dipping, spraying,
Rocking, ultrasonic cleaning, steam cleaning, etc.

Next, various tests performed to confirm the performance of the cleaning solvent composition according to the present invention will be described.

<< Mechanical oil washing test >> This test was conducted using SUS-
304 test pieces (length 25 mm x width 30 mm x thickness 2 mm) were prepared, and the test pieces were machined with machine oil (CQ-
30: manufactured by Nippon Oil Co., Ltd.), and then immersed in each cleaning solution for about 3 minutes. Thereafter, the test piece was subjected to a drying treatment, and the cleaning condition of the test piece was examined. As the cleaning liquid, 1,1,1,3,3-pentafluorobutane (36
5mfc) against normal propyl bromide (NP
B), isopropyl bromide (IPB), nitromethane, nitroethane, d-limonene and 3-methoxy.
A mixture of butyl acetate (3-MBA) was used. The following Tables 1 to 3 summarize the composition of the cleaning liquid and the cleaning results. Note that the washing liquid to which normal propyl bromide (NPB) or isopropyl bromide (IPB) is mixed contains a small amount of nitroethane as a stabilizer.

[0030]

[Table 1]

[Table 2]

[Table 3]

From these results, it was found that 1,1,1,3,3-pentafluorobutane (36
5mfc), 20% by weight or more for normal propyl bromide and isopropyl bromide, and nitromethane, nitroethane, d-limonene and 3%
It was found that about 30% by weight of -methoxybutyl acetate was required to be contained.

<< Flux Cleaning Test >> In this test, a flux (Tamura FA) was applied to the entire surface of the test printed circuit board.
L-4, manufactured by Tamura Corporation) and applied for about 200
After baking for about 2 minutes in an electric furnace at
Soak for minutes. Thereafter, the printed circuit board was subjected to a drying treatment, and the cleaning state was examined. As the cleaning liquid, 1,1,1,
A mixture of 3,3-pentafluorobutane (365mfc) and normal propyl bromide (NPB), isopropyl bromide (IPB), nitromethane, nitroethane, d-limonene, and 3-methoxybutyl acetate (3-MBA) used. Table 4 below
Table 6 summarizes the composition of the cleaning liquid and the cleaning results. Note that the washing liquid to which normal propyl bromide (NPB) or isopropyl bromide (IPB) is mixed contains a small amount of nitroethane as a stabilizer.

[0033]

[Table 4]

[Table 5]

[Table 6]

From these results, in the cleaning of the flux, 35% by weight of 1,1,1,3,3-pentafluorobutane (365 mfc) and 35% by weight of normal propyl bromide (NPB) and isopropyl bromide (IPB) were used. As described above, it was found that nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate (3-MBA) had to be contained in an amount of 40% by weight or more.

<< Effects on Plastics, Rubbers, and the Like >> Tests were conducted to examine the effects on various plastics, rubbers, and the like. In this test, plastics such as soft vinyl chloride, hard vinyl chloride, polycarbonate (PC),
Acrylic resin, nylon 66 (registered trademark), polyacetal, polyurethane resin, phenol resin, epoxy resin, melamine resin, urea resin, polyethylene, and polypropylene are prepared. As rubber, fluorine rubber, chloroprene rubber, silicon rubber, urethane rubber, SBR,
Prepare natural rubber and butyl rubber, each at room temperature about 6
A test of immersion in the cleaning solution for a time was performed. Thereafter, a drying treatment was performed to check for the influence.

[0036]

[Table 7]

[Table 8]

[Table 9]

From these results, it was confirmed that soft and hard vinyl chloride and polycarbonate may have an adverse effect. When it is not desired to have an adverse effect on soft vinyl chloride, hard vinyl chloride, and polycarbonate, the content of normal propyl bromide and isopropyl bromide is 45% by weight of 1,1,1,3,3-pentafluorobutane (365 mfc). %, And the content of nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate (3-MBA) must be set to 50% by weight or less.

<< Flammability Test >> In this test, since alkane having 5 or more carbon atoms, cycloalkane or alcohol having 5 or more carbon atoms is flammable and combustible, these solvents are used. The relationship between the content when 1,1,1,3,3-pentafluorobutane (365 mfc) was contained and the flammability was examined. Ethyl alcohol (ethanol), methyl alcohol (methanol), and heptane were used as the mixed solvent. The test results are shown in Table 10 below.
Summarized in In addition, the flammability was examined by a tag sealing method.

[0039]

[Table 10]

From these results, it can be seen that, when the content of each of the solvents of ethyl alcohol, methyl alcohol and heptane is 18% by weight or more, the solvent becomes flammable. Therefore, in the cleaning solvent composition (type 2) according to the present invention, It has been found that the content of these solvents needs to be set to 15% by weight or less in order not to have flammability.

Further, nitromethane, nitroethane, d-
Limonene and 3-methoxybutyl acetate (3-M
Since BA) also has flammability, the relationship between the content and flammability of these solvents was examined. The test results are summarized in Table 11 below. In addition, the flammability was measured by a tag sealing method.

[0042]

[Table 11]

From these results, it is found that nitromethane and nitroethane are flammable at 80% by weight or more, and d-limonene and 3-methoxybutyl acetate (3-MBA) at 95% by weight or more, respectively. Therefore, in order to make the cleaning solvent composition (type 3) according to the present invention nonflammable, the content of nitromethane and nitroethane should be reduced to 70% by weight or less, and d-limonene and 3-methoxybutyl were used. It was found that the content of acetate (3-MBA) had to be set to 90% by weight or less.

<< Metal Corrosion Test >> In this test, JIS-
In accordance with K1600, an aluminum piece (JIS-H-4000, JIS-H-4000,
A1100P) was placed, and the state of corrosion of the metal after about 48 hours was examined.

[0045]

[Table 12]

[Table 13]

As a result, it was confirmed that none of the cleaning solvent compositions according to the present invention had any adverse effect such as corroding metals.

<< Summary >> The results of these tests are summarized as follows. (1) For use in machine oil washing, at least 20% by weight or more for normal propyl bromide or isopropyl bromide, and at least 30% for nitromethane, nitroethane, d-limonene or 3-methoxybutyl acetate (3-MBA). It must be contained in an amount of at least% by weight. (2) For use in flux washing, at least 35% by weight or more for normal propyl bromide or isopropyl bromide, and at least 40% by weight for nitromethane, nitroethane, d-limonene or 3-methoxybutyl acetate (3-MBA). %
Above, it is necessary to contain.

(3) In order to avoid adverse effects on soft vinyl chloride, hard vinyl chloride and polycarbonate, the content of normal propyl bromide or isopropyl bromide is set to 45% by weight or less, and nitromethane, nitroethane, d- The content of limonene or 3-methoxybutyl acetate (3-MBA) is suppressed to 50% by weight or less. (4) In order to prevent flammability from occurring even when an alkane having 5 or more carbon atoms, a cycloalkane or an alcohol having 5 or more carbon atoms is mixed, the content is reduced to 15% by weight or less. Set. (5) Nitromethane and nitroethane are 80% by weight or more, and d-limonene and 3-methoxybutyl acetate (3-MBA) are flammable even when mixed within the range specified in the present invention. Does not occur. (6) With the cleaning solvent composition according to the present invention, there is no fear of affecting metals such as corrosion.

Taking these matters into consideration, the more preferable range of the content of each component is as follows. [1 ′] (a) 55 to 65% by weight of 1,1,1,3,3-pentafluorobutane, and (b) 35 to 45% of normal propyl bromide and / or isopropyl bromide.
A solvent composition for cleaning characterized by containing by weight. [2 ′] (a) 40 to 62% by weight of 1,1,1,3,3-pentafluorobutane, and (b) 35 to 45% of normal propyl bromide and / or isopropyl bromide.
Weight%, (c) alkanes having 5 or more carbon atoms, 5 carbon atoms
A cleaning solvent composition comprising 3 to 15% by weight of one or more solvents selected from cycloalkanes and alcohols or a mixture of two or more solvents. [3 ′] (a) 50 to 60% by weight of 1,1,1,3,3-pentafluorobutane; (b) 1 selected from nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate A cleaning solvent composition comprising 40 to 50% by weight of a kind of solvent or a mixed solvent of two or more kinds.

[0050]

According to the first cleaning solvent composition of the present invention, 1,1,1,3,3-pentafluorobutane is mixed with normal propyl bromide and / or isopropyl bromide. In addition, the cleaning ability, especially the degreasing cleaning ability, can be greatly improved, and sufficient performance can be exhibited in various cleanings. Moreover, since it is not flammable and does not correspond to a dangerous substance, it is safe and easy to handle, and has a small ozone depletion potential (ODP) and a low global warming potential (GWP).

According to the second cleaning solvent composition of the present invention, in addition to 1,1,1,3,3-pentafluorobutane, normal propyl bromide and / or isopropyl bromide, It contains one or more solvents selected from among five or more alkanes, cycloalkanes having five or more carbon atoms, and alcohols, and is water-soluble contained in flux and the like. Washing of inorganic substances and the like can also be performed. In addition, since these solvents are very inexpensive, expensive 1,1,
By mixing instead of 1,3,3-pentafluorobutane, a significant cost reduction can be achieved and the price can be reduced (claim 2).

Further, according to the third cleaning solvent composition of the present invention, nitromethane, nitroethane, d-limonene, 3-methoxy. By containing butyl acetate, the cleaning ability can be improved in the same manner as normal propyl bromide or isopropyl bromide, and sufficient performance can be exhibited in various types of cleaning (claim 3).

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[Procedure amendment]

[Submission Date] September 13, 2001 (2001.9.1)
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[0008]

In order to achieve the above object, a cleaning solvent composition according to the present invention comprises:
(A) 1,1,1,3,3-pentafluorobutane
0-70% by weight, (b) nitromethane, nitroethane,
In d-limonene and 3-methoxybutyl acetate
One or a mixture of two or more solvents selected from
It is characterized by containing 0 to 70% by weight.

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[0016] Nitromethane, nitroethane, d-limonene and 3-methoxybutyl acetate have been disclosed by the present inventors.
Has been found as a suitable solvent for improving the cleaning ability of 1,1,1,3,3-pentafluorobutane . These have sufficient degreasing and cleaning performance.
can get.

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1,1,1,3,3-pentafluorobutane in an amount of 30 to 70% by weight, nitromethane, nitroethane,
One or a mixture of two or more solvents selected from d-limonene and 3-methoxybutyl acetate
The reason for setting the amount to 0 to 70% by weight is that if the content is too small, the cleaning ability is not sufficiently increased, and a sufficient cleaning effect cannot be obtained. If the content is too large, nitromethane and nitroethane are used. , D-limonene and 3
-The characteristics of methoxy butyl acetate appear greatly,
This is because the excellent properties of 1,1,1,3,3-pentafluorobutane cannot be fully utilized.

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[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the cleaning solvent composition according to the present invention will be described below. The cleaning solvent composition according to the present invention comprises: (a) 1,1,1,3,3-pentaf
30-70% by weight of luorobutane, (b) nitrometa
Nitroethane, d-limonene and 3-methoxybutane
One solvent or two solvents selected from tilacetate
The above mixed solvent is contained in an amount of 30 to 70% by weight. this
In addition, the following two types of cleaning solvent compositions
As in the case of the present invention, it is possible to obtain a composition having excellent cleaning ability.
it can.

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Normal propyl bromide (alias: n-
Propyl bromide, 1-bromopropane. Hereinafter simply referred to as NPB
Isopropyl bromide (also called bromide)
Sopropyl or 2-bromopropane, hereinafter referred to as IPB
) Is 1,1,1,3,3-pentafluorobutane
Found as a suitable solvent to improve cleaning performance
It is a thing. These NPB and IPB have KB values.
Relatively high at 125, excellent in degreasing and cleaning. Moreover,
Like 1,1,1,3,3-pentafluorobutane,
It is non-flammable and has non-combustible or non-flammable properties.
It is not a rugged material and is safe and easy to handle.
Ozone depletion coefficient (O
DP) and global warming potential (GWP) are small and environmentally friendly
It has the excellent property of being clean. these
NPB and / or IPB with a high KB value are 1,1,1,
Washing by mixing with 3,3-pentafluorobutane
The capacity, especially the degreasing cleaning capacity, can be greatly increased,
As a cleaning agent, sufficient performance can be exhibited.
Also, since it is not flammable as before, it is not classified as dangerous.
It is safe and easy to handle. In addition, the ozone depletion potential (OD
P) and global warming potential (GWP) are small and environmentally friendly
It is clean. 1,1,1,3,3-pentafluoro
30-80% by weight of butane, NPB and / or IPB
The NPB and / or I was set at 20 to 70% by weight.
If the content of PB is too small, the cleaning ability is not much improved.
This is because a sufficient cleaning effect cannot be obtained.
Further, the content of NPB and / or IPB is too high.
If too large, the characteristics of NPB and / or IPB become large and appear.
And the dissolving power is too high, and 1,1,1,3,3
-Pentafluorobutane's excellent properties cannot be fully utilized
Because it becomes. 1,1,1,3,3-pentafluoro
Ensure at least 30% by weight of butane
Thus, the characteristics can be exhibited. Also charcoal
Alkanes with 5 or more prime numbers, cycloalkyls with 5 or more carbon atoms
At least one selected from lucans and alcohols
The solvent is mixed with 1,1,1,3,3-pentaf
While reducing the content of luorobutane,
Propyl bromide and / or isopropyl bromide
Water contained in flux etc.
This is for dissolving soluble inorganic substances and the like. 1,
1,1,3,3-pentafluorobutane is very expensive
Expensive, large quantities can lead to significant price increases
Because there is no such solvent, the above-mentioned solvent which is much cheaper
Instead it can be mixed to avoid significant price increases
it can. The content of these solvents was adjusted to 3% by weight or more.
Is to remove water-soluble inorganic substances contained in flux etc.
This is for sufficiently dissolving. In addition, the content of these solvents
The reason why the amount is set to 15% by weight or less is that these solvents are flammable.
Mix too much to have dangerous goods
This is because it becomes flammable. Here, normal propyl bromide (NPB) and isopropyl bromide (I
As for PB), either one of them may be blended alone, or both may be blended. NPB and IP
As for B, since a metal reaction with aluminum or an alloy thereof is easy, at least one substance selected from the group consisting of nitroalkanes, ethers, epoxides and amines is used as a stabilizer in order to prevent this reaction. It is good to add a trace amount or a small amount. Further, in the present cleaning solvent, a small amount or a small amount of a fragrance such as d-limonene may be added in order to suppress the odor of NPB.

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

On the other hand, alkanes having 5 or more carbon atoms and cycloalkanes having 5 or more carbon atoms include pentane, 2-
Methylbutane, 2,2-dimethylpropane, hexane,
2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, heptane,
-Methylhexane, 3-methylhexane, 2,3-dimethylpentane, 2,4-dimethylpentane, octane,
Examples include, but are not limited to, 2,2,3-trimethylpentane, 2,2,4-trimethylpentane, cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, and the like. In addition, as alcohols, methanol, ethanol,
Examples include i-propanol, n-propanol, n-butanol, i-butanol, s-butanol, t-butanol and the like. These alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols may be mixed with one kind of solvent, or may be mixed with two or more kinds of mixed solvents.

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050]

According to the cleaning solvent composition of the present invention,
For example, for 1,1,1,3,3-pentafluorobutane
Nitromethane, nitroethane, d-limonene, 3-
Containing methoxy butyl acetate, the cleaning performance
Power, especially the degreasing and cleaning capacity
Performance can be demonstrated in various cleaning
it can. Moreover, they are not flammable and do not fall under dangerous goods
, Safe and easy to handle, and ozone depletion potential
(ODP) and global warming potential (GWP)
Gentle and clean.

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Deleted

[Procedure amendment 18]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Deleted

Claims (3)

[Claims] (1) 30 to 80% by weight of (a) 1,1,1,3,3-pentafluorobutane, and (b) 20% of normal propyl bromide and / or isopropyl bromide.
A solvent composition for cleaning, comprising about 70% by weight. 2. (a) 15-77% by weight of 1,1,1,3,3-pentafluorobutane, and (b) 20% of normal propyl bromide and / or isopropyl bromide.
(C) 3 to 15 weight% of one or more solvents selected from alkanes having 5 or more carbon atoms, cycloalkanes having 5 or more carbon atoms, and alcohols.
A solvent composition for cleaning characterized by containing by weight. 3. (a) 30 to 70% by weight of 1,1,1,3,3-pentafluorobutane, (b) nitromethane,
A cleaning solvent composition comprising 30 to 70% by weight of one kind of solvent selected from nitroethane, d-limonene and 3-methoxybutyl acetate or a mixed solvent of two or more kinds.