JP3346960B2 - Solvent composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board,
The present invention relates to a solvent composition used for degreasing cleaning, flux cleaning, draining cleaning, etc. of electronic parts such as C, precision machine parts, glass substrates and the like.

[0002]

2. Description of the Related Art Various types of oil and fat washing, flux washing, etc.
1,1,2-Trichloro-1,2,2-trifluoroethane (hereinafter referred to as R113) having excellent nonflammability, low toxicity, and excellent stability
Or a mixed solvent composition of R113 and a solvent soluble therein, 1,1,1-trichloroethane, and the like are widely used. R113 has the feature of selectively dissolving various kinds of dirt without invading precision machine parts or base materials such as metals, plastics and elastomers. Therefore, R113 has various electronic components made of metals, plastics, elastomers, etc. It was most suitable for cleaning parts and optical parts.

[0003]

SUMMARY OF THE INVENTION Conventionally used R
Although 113 and 1,1,1-trichloroethane have various advantages, they are chemically very stable, have a long life in the troposphere, diffuse to reach the stratosphere, where they are decomposed by ultraviolet light to generate chlorine radicals. It is said that these chlorine radicals cause a chain reaction with stratospheric ozone and destroy the ozone layer. Therefore, the production and consumption of the chlorine radicals are regulated. For this reason, the conventional R113, 1,1,1
-The search for alternative solvents that are less likely to destroy the ozone layer instead of trichloroethane is being actively conducted.

[0004] US Pat. No. 5,116,525 describes:
An azeotropic composition of dichloropentafluoropropane (hereinafter abbreviated as R225), trans-1,2-dichloroethylene (hereinafter abbreviated as t-DE), methanol (hereinafter abbreviated as MeOH), ethanol, or isopropanol is used. It is shown.

[0005] Among them, the composition comprising MeOH is 1,1 - dichloro - 2,2,3,3,3 - pentafluoropropane (hereinafter, abbreviated as R225ca) 50 to 75
% And 1,3-dichloro-1,1,2,2,3-
Pentafluoropropane (hereinafter abbreviated as R225cb)
47 to 57% by weight of R225 consisting of 25 to 50% by weight, 38 to 48% by weight of t-DE and 3 to 48% by weight of MeOH.
An azeotropic composition containing 9% by weight and having a boiling point of 43.7 ° C. at atmospheric pressure of 760 mmHg is disclosed.

However, it has been confirmed by the present inventors that the azeotropic composition has a large effect on the material of the article to be cleaned and has flammability. The object of the present invention is R225, t
A solvent composition comprising DE and MeOH, wherein R1
Solvent composition that satisfies the excellent properties of 13 and 1,1,1-trichloroethane and can be used as an alternative solvent that has a very small effect on the ozone layer, has no effect on the material of articles to be washed, and has no flammability The purpose is to provide.

[0007]

According to the present invention, there is provided (a) R22.
5, comprising (b) t-DE and (c) MeOH;
(A) to the sum of (a), (b) and (c),
(B) and the ratio, respectively 61-67 wt% of (c), a solvent composition is 2 7-3 2 wt% and 6-7 wt%.

[0008] In the present invention, R225 is represented by the chemical formula C ₃
It means one or a mixture of two or more dichloropentafluoropropanes represented by HCl ₂ F ₅ . R225
Is preferably at least one selected from R225ca and R225cb. Particularly preferred R22
5 is a mixture of R225ca and R225cb. A preferred mixing ratio is R225ca / R225cb.
= 1 to 99% by weight / 1 to 99% by weight, more preferably R225ca / R225cb = 40 to 75% by weight
/ 25 to 60% by weight.

The solvent composition of the present invention comprises (a) R225,
(B) comprising t-DE and (c) MeOH;
(B) and to the sum of (c) (a), ( b) and 6 1 to 67% by weight ratio respectively are of (c), 27~3
2% by weight and 6-7% by weight.

The solvent composition of the present invention may contain a compound other than the above (a), (b) and (c) as long as the object of the present invention is not impaired.

In order to mainly adjust the solubility, for example, one or more of the following compounds may be used in an amount of 0.1 to 5
0% by weight, preferably 0.1 to 30% by weight, more preferably 0.1 to 20% by weight can be incorporated into the composition of the present invention.

N-pentane, 2-methylbutane, 2,2
-Dimethylpropane, n-hexane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 2, Hydrocarbons such as 4-dimethylpentane, n-octane, 2,2,3-trimethylpentane, 2,2,4-trimethylpentane, cyclopentane, cyclohexane, methylcyclohexane and ethylcyclohexane.

Chlorinated hydrocarbons such as dichloromethane, cis-1,2-dichloroethylene, trichloroethylene and tetrachloroethylene.

Ketones such as acetone, methyl ethyl ketone, methyl butyl ketone and methyl isobutyl ketone;

Ethers such as diethyl ether, methyl cellosolve, tetrahydrofuran and 1,4-dioxane;

Chlorinated fluorinated hydrocarbons such as 2,2-dichloro-1,1,1-trifluoroethane and 1,1-dichloro-1-fluoroethane.

Methyl acetate, ethyl acetate, propyl acetate,
Esters such as butyl acetate.

Alcohols other than methanol, such as ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol and t-butanol.

In order to mainly improve the stability, for example, one or more of the following compounds are added in an amount of 0.001 to
10% by weight, preferably in the range of 0.001 to 5% by weight, can be incorporated into the composition of the present invention.

Nitro compounds such as nitromethane, nitroethane, nitropropane and nitrobenzene.

Diethylamine, triethylamine, i-
Amines such as propylamine, n-butylamine and i-butylamine.

Phenol, o-cresol, m-cresol, p-cresol, thymol, pt-butylphenol, t-butylcatechol, catechol, isoeugenol, o-methoxyphenol, bisphenol A, isoamyl salicylate, benzyl salicylate, salicylic acid Phenols such as methyl and 2,6-di-t-butyl-p-cresol.

2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, Triazoles such as 2,3-benzotriazole and 1-[(N, N-bis-2-ethylhexyl) aminomethyl] benzotriazole.

The solvent composition of the present invention comprises R225, tD
Since it contains E and MeOH in a specific ratio, the material of the article to be washed, such as hard vinyl chloride, polystyrene, polycarbonate, polyphenylene oxide, ABS resin,
It has no effect on plastics and rubbers such as EPDM rubber, and has excellent flammability.

Further, the solvent composition of the present invention can be prepared using a conventional R
It has the same dissolving power as the 113 series and 1,1,1-trichloroethane series, and can be suitably used for various applications. Specific examples of such uses include removers for grease, oil, flux, wax, ink, etc., solvents for paints, and extractants. Further, there may be mentioned a detergent for removing various articles made of glass, ceramics, plastic, rubber, and metal, and a dust remover. In particular, it is suitable as a cleaning agent for IC components, electric equipment, precision instruments, optical lenses, and the like, and a dust removing agent. As a cleaning method, hand wiping, dipping, spraying, rocking, ultrasonic cleaning, steam cleaning, a method combining these, or the like may be employed.

[0026]

【Example】

"Examples 1 to 2 (Reference Example) and Examples 3 to 5 (Examples)" Using the solvent composition shown in Table 1, a washing test of machine oil was performed.
That is, a SUS-304 test piece (25 mm ×
30 mm x 2 mm) was immersed in a machine oil (Daphne cut AS-40H manufactured by Idemitsu Oil Co., Ltd.), and 5
Minutes. Degree of removal of machine oil (◎: good removal possible, △:
Table 1 shows the results of the determination of “remaining in a trace amount, ×: considerably remaining”.
Column.

Similarly, a flux cleaning test was performed using the solvent compositions shown in Table 1. That is, a printed board made of glass epoxy (50 mm × 100 mm × 1.6 mm)
Flux (speedy flux AGF-J-
I: manufactured by Asahi Chemical Laboratories), soldered at 260 ° C. using a wave solder machine, and immersed in the solvent composition shown in Table 1 for 3 minutes for washing. The results of determination of the degree of flux removal (（: good removal possible, Δ: trace remaining, ×: considerable remaining) are shown in column B of Table 1.

"Examples 6 to 7 (Reference Examples), Examples 8 to 10 (Examples) and Examples 11 to 12 (Comparative Examples)" Using the solvent compositions shown in Table 2, an effect test on the materials was carried out. That is, test pieces (25 mm) of hard vinyl chloride (C), polystyrene (D), polycarbonate (E), polyphenylene oxide (F), ABS resin (G), and EPDM rubber (H)
× 30 mm × 2 mm) in the solvent composition of Table 2 at 50 ° C.
For 5 minutes. The results of determining the rate of change of the material (◎: no change, ：: slight swelling is observed but no significant change, Δ: swelling is observed, ×: dissolution or cracking) are shown in each column of Table 2. Show.

Examples 13 to 14 (Reference Examples), Examples 15 to 17
(Example) and Example 18 (Comparative Example) A flammability test was conducted using the solvent compositions shown in Table 3. That is, Table 3 shows the results of determination of the flash point of the solvent composition in Table 3 using a Cleveland open flash point measuring device.

In Tables 1 to 3, R225 (ca:
cb) indicates a mixture of R225ca and R225cb. In addition, the number in parenthesis of% by weight indicates R225 with respect to R225.
The ratio (%) of each of 225ca and R225cb is shown.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

The solvent composition of the present invention satisfies the excellent properties of conventional R113 and 1,1,1-trichloroethane, has no effect on the material of the article to be washed, and has good flammability. And has the advantage that it hardly affects the ozone layer.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Special Table Hei 5-505183 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C11D 7/30 C23G 5/028 C23G 5 / 032 H01L 21/304 H05K 3/26

Claims (2)

(57) [Claims] (1) dichloropentafluoropropane (a),
(B) comprising trans-1,2-dichloroethylene and (c) methanol, wherein (a), (b) and (c)
To the sum of (a), (b) and the ratio, respectively 61-67 wt% of (c), 2 7 ~3 2 wt% and 6 ~
A solvent composition that is 7 % by weight. 2. The method according to claim 1, wherein the dichloropentafluoropropane is 1,1.
1-99% by weight of dichloro-2,2,3,3,3-pentafluoropropane and 1,3-dichloro-1,1,
2. The solvent composition according to claim 1, comprising 1 to 99% by weight of 2,2,3-pentafluoropropane.