JPH07324200A - Mixed solvent composition - Google Patents

Abstract

PURPOSE:To obtain a mixed solvent compsn. which is effective in cleaning various staining substances without corroding a substrate such as a metal or a plastics and without affecting the ozone layer by compounding a specifics propanol deriv. with methanol and/or ethanol. CONSTITUTION:A mixed solvent compsn. contains 100 pts.wt. 2, 2, 3, 3, 3- pentafluoro-1-propanol and 0.1-20 pts.wt. methanol and/or ethanol. The compsn. may further contain 0.1-100 pts.wt. solvent such as a chlorohydrocarbon (e.g. dichloromethane), an alcohol (e.g. 1-propanol), or a ketone (e.g. acetone) to enhance the dissolving power and 0.001-10 pts.wt. compd. such as a nitro compd. (e.g. nitromethane) or an amine (e.g. diethylamine) mainly to enhance the safety.

Description

Detailed Description of the Invention

[0001]

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

[0002]

BACKGROUND OF THE INVENTION 1,1,2-Trichloro-1, which is excellent in non-combustibility, low toxicity and stability, for cleaning various oils, fluxes, etc.
2,2-trifluoroethane (hereinafter referred to as R113) or a mixed solvent composition of this R113 and a solvent soluble therein is widely used. R113 has a feature of selectively dissolving various stains without invading a base material such as metal, plastic, and elastomer, and therefore various precision machine parts and various electronic parts made of metal, plastic, elastomer, or the like, or A printed circuit board on which these electronic components are mounted,
It was most suitable for cleaning precision machine parts and optical parts.

[0003]

[Problems to be Solved by the Invention] Conventionally used R1
Despite having various advantages, 13 is extremely chemically stable, so it has a long life in the troposphere, diffuses and reaches the stratosphere, where it is decomposed by ultraviolet rays to generate chlorine radicals. Since chlorine radicals cause a chain reaction with ozone in the stratosphere and destroy the ozone layer, the production and use of the chlorine radicals are regulated.

Therefore, in place of the conventional R113, an alternative solvent that is less likely to destroy the ozone layer is being actively searched.
This alternative solvent includes 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro-1-fluoroethane and 3,3-dichloro-1,1,1,2,2-penta Fluoropropane, 1,3-dichloro-1,1,2,2,3-pentafluoropropane, etc. have been developed.

Similar to R113, these alternative solvents have excellent cleaning properties, and also have a very small effect on the ozone layer. However, these alternative solvents have a slight effect on the ozone layer because they contain chlorine atoms. Therefore, it is desired to develop a more excellent alternative solvent that does not affect the ozone layer at all.

It is an object of the present invention to provide a novel mixed solvent which can be used as an alternative solvent which does not affect the ozone layer at all while satisfying the excellent properties of conventional R113. .

[0007]

The present invention has been made to achieve the above-mentioned object. First, at least one of methanol and ethanol and 2,2,3,3,3-pentafluoro-1 are used. Second, a mixed solvent composition consisting of propanol (hereinafter referred to as 5FP) is a pseudo-azeotropic or azeotropic mixed solvent composition composed of 5FP and methanol.

The mixed solvent composition of the present invention contains 5FP as a main component, and is mixed with at least one of methanol and ethanol.

The mixing composition ratio of the mixed solvent composition of the present invention is not particularly limited, but preferably 0.1 to 20 parts by weight of at least one of methanol and ethanol, preferably 100 parts by weight of 5FP. It is a ratio of 1 to 10 parts by weight.

Further, a composition comprising 5FP and methanol was made into a pseudo-azeotropic solvent composition in the range of 5FP 93 to 97% by weight and methanol 3 to 7% by weight, and further 5FP 95.2.
Since an azeotropic composition is produced with wt% and 4.8 wt% of methanol, use within this range is preferable because the composition can be used with little or no change in composition.

To increase the solubility, for example, one or two or more of the compounds listed below are used in an amount of 0.1 to 100 parts by weight, preferably 0.1 to 100 parts by weight, relative to 100 parts by weight of 5FP in the composition of the present invention. 50 parts by weight, more preferably 0.1 to 20 parts by weight, can be contained in the composition of the present invention.

Dichloromethane, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene,
Chlorinated hydrocarbons such as tetrachlorethylene. Ethanol, 1-propanol, 2-propanol, 1-butanol,
Alcohols other than methanol, such as 2-butanol, isobutanol, and t-butanol.

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. 2,2-dichloro-1,
1,1-trifluoroethane, 1,1-dichloro-1-fluoroethane, 3,3-dichloro-1,1,1,2,2-pentafluoropropane, 1,3-dichloro-1,1,2 , 2,3-Pentafluoropropane, 1,1-dichloro-1,2,2,3,3-pentafluoropropane, 1,2-dichloro-1,1,3,3,3-pentafluoropropane, 1 , 2-Dichloro-1,1,2,3,3-pentafluoropropane, 2,3-dichloro-1,1,1,2,3-pentafluoropropane, 2,2-dichloro-1,1,1 Chlorinated fluorinated hydrocarbons such as 3,3,3-pentafluoropropane. Esters such as ethyl acetate, propyl acetate and butyl acetate.

Further, in order to mainly improve the stability, for example, one or more of the following compounds is added in an amount of 0.001 to 1 with respect to 100 parts by weight of 5FP in the composition of the present invention.
It can be contained in the composition of the present invention in a proportion of 0 parts by weight, preferably 0.01 to 5 parts by weight.

Nitro compounds such as nitromethane, nitroethane, nitropropane and nitrobenzene. Amines such as diethylamine, triethylamine, i-propylamine, butylamine and i-butylamine. Phenol, o-cresol, m-cresol, p-cresol, thymol, p-
Phenols such as t-butylphenol, t-butylcatechol, catechol, isoeugenol, o-methoxyphenol, bisphenol A, isoamyl salicylate, benzyl salicylate, methyl salicylate, and 2,6-di-t-butyl-p-cresol.

2- (2'-hydroxy-5'-methyl-phenyl)
Benzotriazole, 2- (2'-hydroxy-3'-t-butyl-
5'-methylphenyl) -5-chlorobenzotriazole, 1,
2,3-benzotriazole, 1-[(N, N-bis-2-ethylhexyl) aminomethyl] benzotriazole triazoles.

The mixed solvent of the present invention has a dissolving power equal to or higher than that of the conventional R113 system, forms an azeotropic or pseudo-azeotropic composition with little or no change in composition, and is suitable for various uses. Can be used. Such specific applications include flux, grease, oil, wax, ink and other removers, paint solvents, extractants, glass, ceramics, plastics, rubber, various metal articles, especially electronic components such as ICs, electronic -Electrical equipment, precision machinery, cleaning agents for optical lenses, etc. can be mentioned.

As a cleaning method, hand-wiping, dipping, spraying, shaking, ultrasonic cleaning, steam cleaning or a combination thereof may be adopted.

[0019]

EXAMPLES Examples of the present invention will be shown below.

[Example 1] 5FP (boiling point 80.7 ° C) 9
A distillation flask was charged with 1000 g of a mixed solvent composition consisting of 5.2% by weight and 4.8% by weight of methanol (boiling point 64.5 ° C.) and attached to a rectification column having 5 theoretical plates. Next, the mixed solvent composition is heated and totally refluxed for 2 hours, and after reaching an equilibrium state, a fraction is collected with time and analyzed by a gas chromatograph. The results are shown in Table 1.

[Example 2] 5FP / methanol = 93.
Mixed solvent composition 100 having a composition of 0 / 7.0% by weight
0 g was placed in a distillation flask and attached to a rectification column having 5 theoretical plates. Next, the mixed solvent composition was heated and totally refluxed for 2 hours, and after reaching an equilibrium state, fractions were collected with time and analyzed by gas chromatography. The results are shown in Table 2.

[Embodiment 3] 5 FP / methanol = 97.
Mixed solvent composition 100 having a composition of 0 / 3.0% by weight
0 g was placed in a distillation flask and attached to a rectification column having 5 theoretical plates. Next, the mixed solvent composition was heated and totally refluxed for 2 hours, and after reaching an equilibrium state, fractions were collected with time and analyzed by gas chromatography. The results are shown in Table 2.

Examples 4 to 11 Flux cleaning tests are carried out using the mixed solvent compositions shown in Table 3 below. That is, a printed circuit board made of glass epoxy (50 mm x 1
Apply flux (Speedy Flux AGF-JI: manufactured by Asahi Chemical Research Institute) on the entire surface (00 mm x 1.6 mm),
After soldering using a wave soldering machine at a soldering temperature of 260 ° C., 5 was added to the mixed solvent composition of the present invention shown in Table 3 below.
Soak and wash for a minute. The degree of flux removal was determined, and the result is shown in Table 3 below as the removal degree. ⊚: Can be removed satisfactorily, △: Trace amount remains, ×: Remains considerably.

[Examples 12 to 19] Adhesive water removal tests are conducted using the mixed solvent compositions shown in Table 4 below. That is, a 30 mm × 18 mm × 5 mm glass plate was dipped in pure water and then added to the mixed solvent composition of the present invention shown in Table 4 below.
The glass plate is immersed in 0 second for draining, and the taken out glass plate is immersed in anhydrous methanol to determine the removal state of adhering water from the increased amount of water. The degree of removal of the adhered water is shown in Table 4 below as the degree of removal. ◎: Can be removed well, △: Small amount remains,
×: Remains considerably.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

The mixed solvent composition of the present invention has a conventional R113
Has the advantages of satisfying the excellent characteristics of, and not affecting the stratospheric ozone layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C11D 7:26 7:28) (72) Inventor Shuichi Okamoto 1160 Matsubara, Hazawa-machi, Kanagawa-ku, Yokohama, Kanagawa Address: A-G Technology Co., Ltd. (72) Inventor Keiichi Onishi 1150, Hazawa-machi, Kanagawa-ku, Yokohama, Kanagawa Prefecture Asahi Glass Co., Ltd. Central Research Laboratory

Claims (4)

[Claims] 1. A mixed solvent composition comprising 2,2,3,3,3-pentafluoro-1-propanol containing at least one of methanol and ethanol. 2. The composition according to claim 1, which contains 0.1 to 20 parts by weight of at least one of methanol and ethanol with respect to 100 parts by weight of 2,2,3,3,3-pentafluoro-1-propanol. Composition. 3. A pseudoazeotropic mixed solvent composition comprising 93 to 97% by weight of 2,2,3,3,3-pentafluoro-1-propanol and 3 to 7% by weight of methanol. 4. An azeotropic solvent mixture composition comprising 95.2% by weight of 2,2,3,3,3-pentafluoro-1-propanol and 4.8% by weight of methanol.