JPH02222495A - Chlorinated and fluorinated hydrocarbon based flux cleaning agent - Google Patents

Abstract

PURPOSE:To obtain a flux cleaning agent containing a specific chlorinated and fluorinated hydrocarbon as an active ingredient, having excellent cleaning and removing effect and exerting no bad influence upon a composite component consisting of metal, plastics and elastomer, etc. CONSTITUTION:The aimed flux cleaning agent containing 4C chlorinated and fluorinated hydrocarbon (preferred example; 1-chloro-1,1-difluorobutane, 3- chloro-1,1,1-trifluorobutane, 1-chloro-1,1,3,3-tetrafluorobutane, 2- chloro-1,1,1,4,4,4-hexafluorobutane, 4-chloro-1,1,1,2,2,3,3-heptafluorobutane, 1- chloro-2,2,3,3-tetrafluorocyclobutane, 1,1-dichloro-2,2,3,3-tetrafluorocyclobutane or 1-chloro-2,2,3,3,4,4-hexafluorocyclobutane) as an active ingredient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flux cleaning agent used for removing flux adhered to printed circuit boards and the like.

[Prior Art] Fluxes are used in the assembly process of printed circuit boards on which semiconductors, IC1 electronic components, etc. are mounted, but in many cases, the product cannot be produced if these substances remain attached.Therefore, fluxes are usually used for organic It is washed away using a solvent. As the organic solvent, 1,1°2-trichloro-1,2,2-)lifluoroethane (hereinafter referred to as R113) is widely used because of the following advantages.

R113 is nonflammable, has low toxicity, and has excellent stability.

Furthermore, it has the property of selectively dissolving and removing flux without damaging base materials such as metals, plastics, and elastomers.

In general, printed wiring boards are made of glass fiber reinforced plastic and copper, and are further mounted with various parts made of metal, plastic, elastomer, etc. Therefore, R113 was advantageous from this point as well.

[Problems to be solved by the invention] Despite the fact that conventionally used R113 has various advantages, it has a long lifetime in the troposphere and diffuses into the stratosphere, where it is decomposed by sunlight and becomes chlorine. The use of R113 has been regulated because it generates radicals that cause a chain reaction with ozone and destroy the ozone layer. Therefore, in response to this, it is an object of the present invention to provide a new flux cleaning agent that has various advantages similar to R113 and can wash and remove flux in the same manner.

[Means for Solving the Problems] The present invention has been made to achieve the above-mentioned objects, and
The chlorinated fluorinated hydrocarbon of the present invention, which provides a flux cleaning agent containing a chlorinated fluorinated hydrocarbon having 4 carbon atoms as an active ingredient, includes 1-chloro-
1,1-difluorobutane (b, p, 55.5°C)
, 3-chloro-1,1,1-trifluorobutane (b,
p, 66°C), 1-chloro-1,1,3,3-tetrafluorobutane (b, p, 70°C), 2-chloro-1,1,1,4,4,4-hexafluorobutane ( b
, p, 51°C), 4-chloro-1°1, 1.2.2.
3.3-Heptafluorobutane (b, p, 54°C)
, 3.4-dichloro-1,1,1,2,2,3-hexafluorobutane (b, p, 72°C), 2.3-dichloro-1,1,1,4,4,4-hexafluorobutane Fluorobutane (b, p, 78°C), 4,4-dichloro-1°1
, 1.2.2.3.3-heptafluorobutane (b,
p, 76, 5°C), 1-chloro-2,2,3,3-
Tetrafluorocyclobutane (b, 9.73°C), 1
．． 1-dichloro-2,2,3,3-tetrafluorocyclobutane (b, 9.84°C), 1-chloro-2,2
,3,3,4,4-hexafluorocyclobutane (b,
p.

One type or a mixture of two or more types selected from hydrogen-containing chlorinated fluorinated hydrocarbons such as 40°C) is preferred.

The flux cleaning agent of the present invention may contain various other components depending on various purposes. For example, in order to increase the dissolving power, hydrocarbons, alcohols, ketones, or halogenated carbon At least one kind selected from organic solvents such as hydrogens can be contained. The content ratio of these organic solvents in the flux cleaning agent is 0 to 5.
0% by weight, preferably 10 to 40% by weight, more preferably 20 to 30% by weight.0 When an azeotropic composition exists in the mixture of the chlorinated fluorinated hydrocarbons and organic solvent of the present invention, Particular preference is given to its use in its azeotropic composition.

The hydrocarbons are preferably linear or cyclic saturated or unsaturated hydrocarbons having 1 to 15 carbon atoms, such as n-pentane,
Isopentane, n-hexane, isohexane, neohexane, 2,3-dimethylbutane, 3-methylpentane,
n-hebutane, isohebutane, 3-methylhexane, 2
, 4-dimethylbencune, n-octane, 2-methylhebutane, 3-methylhebutane, 4-methylhebutane, 2
．． 2-dimethylhexane, 2.5-dimethylhexane,
3.3-dimethylhexane, 2-methyl-3-ethylpentane, 3-methyl-3-ethylpentane, 2.3.
3-) dimethylbenkune, 2.3.4-) dimethylbenkune, 2.2.3-trimethylpentane, isooctane, nonane, 2.2.5-) dimethylhexane,
decane, dodecane, 1-pentene, 2-pentene, 1
-hexene, 1-octene, 1-nonene, l-decene,
It is selected from cyclobencune, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, bicyclohexane, cyclohexene, α-pinene, dipentene, decalin, tetralin, amidino, amylnaphthalene, and the like. More preferably n-pentane, neohexane, 2,3-dimethylbutane, n-
Hexane, cyclobencune, cyclohexane, n-hebutane, etc.

The alcohols are preferably chain or cyclic saturated or unsaturated alcohols having 1 to 17 carbon atoms, such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, and 5ec- Butyl alcohol, tert-butyl alcohol, pentyl alcohol, 5ec-amyl alcohol, 1-ethyl-1-propanol, 2-methyl-
1-butanol, isopentyl alcohol, tert-
Pentyl alcohol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 4-methyl-2-pentanol,
2-ethyl-1-butanol, 1-heptatool, 2-
heptatool, 3-heptatool, 1-octanol,
2-octatool, 2-ethyl-1-hexanol, l
-nonanol, 3.5.5-)dimethyl-1-hexanol, 1-decanol, 1-undecanol, 1-dodecanol, allyl alcohol, propargyl alcohol, benzyl alcohol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclo Hexanol, 3-methylcyclohexanol, 4-methylcyclohexanol, α-terpineol, atonitinol, 2
．． It is selected from 6-dimethyl-4-heptatool, trimethylnonyl alcohol, tetradecyl alcohol, heptadecyl alcohol, and the like. More preferably,
Examples include methanol, ethanol, alcohol, and isopropyl alcohol.

1 to 9 saturated or unsaturated hydrocarbon groups) are preferred, including acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, methyl butyl ketone, methyl isobutyl ketone,
2-heptanone, 4-heptanone, diisobutyl ketone, acetonylacetone, mesityl oxide, holon, methyl-n-amyl ketone, ethyl butyl ketone, methylhexyl ketone, cyclohexanone, methylcyclohexanone, isophorone, 2,4-bentanedione, di It is selected from acetone alcohol, acetophenone, fenchen, etc. More preferred are acetone, methyl ethyl ketone and the like.

The halogenated hydrocarbons are preferably saturated or unsaturated halogenated hydrocarbons having 1 to 4 carbon atoms, such as dichloromethane, carbon tetrachloride, chloroform, 1.1-dichloroethane, 1.2-dichloroethane, 1, 1.1-trichloroethane, 1.1.2-trichloroethane, 1.1.
1.2-tetrachloroethane, 1.1.2.2-tetrachloroethane, pentachloroethane, 1.1-dichloroethylene, trans-1,2-dichloroethylene, c
It is selected from is-1,2-dichloroethylene, trichlorethylene, tetrachloroethylene, 1-chloropropane, 2-chloropropane, 1-bromopropane, 2-bromopropane, and the like. More preferably dichloromethane, 1.1.1-trichloroethane, trans
-1,2-dichloroethylene, cis-1,2-dichloroethylene, trichlorethylene, tetrachlorethylene, 2-bromopropane, etc.

The flux cleaning agent of the present invention may further be mixed with various cleaning aids and stabilizers, or hydrogen-containing chlorinated fluorinated hydrohydrogens that have little effect on ozone destruction.
Cleaning methods include hand wiping, dipping, spraying, shaking,
Conventional methods such as ultrasonic cleaning and steam cleaning can be used.

[Examples] Examples 1 to 27 Flux cleaning and removal tests were conducted using flux cleaning agents shown in Table 1 below.

Glass epoxy printed circuit board (50mm x 100
Flux on the entire surface (Tamura F
-AI-4 (manufactured by Tamura Manufacturing Co., Ltd.) was applied, baked for 2 minutes in an electric furnace at 200°C, and then immersed in a flux cleaning agent for 1 minute.

Table 1 shows the degree of flux removal.

Table 1 [Effects of the Invention] As is clear from the Examples, the flux cleaning agent of the present invention has an excellent cleaning and removal effect on fluxes. In addition, since it has an appropriate dissolving power like R113 that has been used conventionally, flux can be washed and removed without adversely affecting composite parts made of metals, plastics, elastomers, etc.

Table 1 (continued)

Claims (1)

[Claims] 1. A flux cleaning agent containing a chlorinated fluorinated hydrocarbon having 4 carbon atoms as an active ingredient. 2. The chlorinated fluorinated hydrocarbon is 1-chloro-1,1-difluorobutane, 3-chloro-1,1,1-trifluorobutane, 1-chloro-1,1,3,3-tetrafluorobutane, 2-chloro-1,1,1,4,4,4-hexafluorobutane, 4-chloro-1,1,1,2,2,3
, 3-heptafluorobutane, 3,4-dichloro-1,
1,1,2,2,3-hexafluorobutane, 2,3-
Dichloro-1,1,1,4,4,4-hexafluorobutane, 4,4-dichloro-1,1,1,2,2,3,3
-heptafluorobutane, 1-chloro-2,2,3,3
-tetrafluorocyclobutane, 1,1-dichloro-2
, 2,3,3-tetrafluorocyclobutane, and 1-chloro-2,2,3,3,4,4-hexafluorocyclobutane. 3. The flux cleaning agent according to claim 1, wherein the flux cleaning agent contains at least one selected from hydrocarbons, alcohols, ketones, and halogenated hydrocarbons.