JPH01132694A - flux detergent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a flux cleaning agent used for removing flux from IC parts, precision machine parts, etc.

[Prior Art] Flux is used in the assembly process of IC parts, precision machine parts, etc., but in many cases, these products cannot be made into products if they are left hanging. Therefore, in the finishing process of such parts, organic solvents are usually used for cleaning. As an organic solvent, it has various advantages as listed below: 1.1.
2-Trichloro-1,2,2-trifluoroethane (hereinafter referred to as R1) is widely used. R1)3 is nonflammable, non-exposed, has low toxicity, and has excellent stability. Furthermore, it does not attack base materials such as metals, plastics, and elastomers, and has the property of selectively dissolving various stains. In general, many of the objects to be cleaned when flux cleaning are composite parts made of metals, plastics, elastomers, etc. Therefore, the old No. 13 was advantageous in this respect as well.

[Problems to be solved by the invention] The present invention solves the problem that although R1)3, which has been used conventionally, has various advantages, it destroys stratospheric ozone and causes skin cancer. In response to this doubt, the objective is to provide a new flux cleaning agent that has various advantages similar to R1)3 and can perform equivalent cleaning.

[Means for solving the problems] The present invention has been made to achieve the above-mentioned objects,
A flux cleaning agent containing 1,2-difluoroethane as an active ingredient is provided.

1,2-difluoroethane (hereinafter referred to as RI52), which is an active ingredient of the flux cleaning agent of the present invention, is an excellent solvent that has the same advantages as conventional R1)3, such as having a suitable dissolving power.

The flux cleaning agent of the present invention can contain various other components depending on various purposes. For example, in order to increase the dissolving power, at least one kind selected from organic solvents such as hydrocarbons, alcohols, ketones, or chlorinated hydrocarbons can be included. The content of these organic solvents in the flux cleaning agent is 0 to 50% by weight, preferably 10 to 40% by weight, and more preferably 20 to 30% by weight. When the mixture of 1,2-difluoroethane and the organic solvent has an azeotropic composition, it is preferable to use the 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, 2-methylpentane, 2,2-dimethylbutane, 2.3-dimethylbutane, n-hebutane, isohebutane, 3-methylhexane, 2.4-dimethylpentane, n-octane, 2-
Methylpentane, 3-methylpentane, 4-methylhebutane, 2.2-dimethylhexane, 2.5-dimethylhexane, 3.3-dimethylhexane, 2-methyl-3-
Ethylbencune, 3-methyl-3-ethylpentane, 2
, 3.3-trimethylpentane, 2.3.4-trimethylpentane, 2.2.3-trimethylpentane,
Isooctane, nonane, 2.2.5-trimedelhexane, decane, dodencane, 1-pentene, 2-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene, cyclobencune, methylcyclopencune, cyclohexane , methylcyclohexane, ethylcyclohexane, bicyclohexane, cyclohexene, α-pinene, dipentene, decalin, tetralin, amidino, amylnaphthalene, and the like. More preferably,
n-pen'? n-hexane, n-hebutane, etc.

The alcohols are preferably linear or cyclic saturated or unsaturated alcohols having from I to 17 carbon atoms, such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, 5ec-butyl alcohol, isobutyl alcohol, ter L-butyl alcohol, pentyl alcohol, 5ec-amyl alcohol, 1-ethyl-1-propatol, 2-methyl-
1-Butanol, isopentyl alcohol, Lert-
Pendel alcohol, 3-methyl-2-butanol, neopentyl alcohol, l-hexanol, 2-methyl-1-pentanol, 4-methyl-2-pentanol,
2-ethyl-1-butanol, 1-heptatool, 2-
heptatool, 3-heptatool, l-octanol,
2-octanol, 2-ethyl-1-hexanol, l
-nonanol, 3.5.5-trimethyl-1-hexanol, I-decanol, 1-undecanol, 1-dodecanol, allyl alcohol, propargyl alcohol, benzyl alcohol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclohexanol , 3-methylcyclohexanol, 4-methylcyclohexanol, α-terpineol, avinitinol, 2
．． It is selected from 6-dimethyl-4-heptatool, trimethylnonyl alcohol, tetradecyl alcohol, heptadecyl alcohol, and the like. More preferred are methanol, ethanol, isopropyl alcohol and the like.

Ketones include R-CO-R', R-Co,
R-Co-R'-, r-C1),.

Any general formula of C0-R", R-CD-R', R-CO-R' (where R, i+', R" is a saturated or unsaturated hydrocarbon group having 1 to 9 carbon atoms) Preferably, those shown are acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, methyl rope tyl ketone, methyl butyl ketone, 2-heptanone, 4
-heptanone, diisobutyl ketone, acetonylacetone, mesityl oxide, holon, methyl-〇-amyl ketone, ethyl butyl ketone, methylhexyl ketone, cyclohexanone, methylcyclohexanone, isophorone, 2,4-pentanedione, diacetone alcohol, acetophenone, It is selected from Feng Chong et al. More preferred are acetone, methyl ethyl ketone and the like.

The chlorinated hydrocarbons are preferably saturated or unsaturated chlorinated hydrocarbons having 1 to 2 carbon atoms, such as methylene chloride, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, 1,1 ．． ! Trichloroethane, 1,1.2-
Trichloroethane, 1.1. selected from l,2-tetrachloroethane, 1.1,2,2-tetrachloroethane, pentachloroethane, 1.1-dichloroethylene, 1,2-dichloroethylene, trichlorethylene, tetrachlorethylene, etc. It is something. More preferably methylene chloride.

! , I, l-trichloroethane, trichlorethylene, tetrachlorethylene, etc.

The flux cleaning agent of the present invention may further be mixed with various cleaning aids, stabilizers, or hydrogen-containing chlorinated fluorinated hydrocarbons that have little effect on ozone destruction.

As the cleaning method, usual methods such as hand wiping, dipping, spraying, shaking, ultrasonic cleaning-1 steam cleaning, etc. can be adopted.

[Examples] Examples 1 to 5 Flux cleaning tests were conducted using flux cleaning agents shown in Table 1 below.

Apply flux (Tamura F-AI-4.■ Tamura Seisakusho) to the entire surface of the printed circuit board (copper-clad laminate) and heat at 200°C.
After baking in an electric furnace for 2 minutes, the sample was immersed in a flux cleaning agent for 1 minute. Table 1 shows the degree of flux removal.

Table 1' () shows the mixing ratio [wt%] O: Good removal △: Small amount remaining ×: Significant amount remaining [Effects of the invention] As is clear from the examples, the flux cleaning agent of the present invention cleans flux. It is highly effective. In addition, since it has an appropriate dissolving power like the old 13 used conventionally, it can be flux cleaned without adversely affecting composite parts made of metal, plastic deck, elastomer, etc.

Claims (2)

[Claims] (1) A flux cleaning agent containing 1,2-difluoroethane as an active ingredient. (2) The flux cleaning agent according to claim 1, wherein the flux cleaning agent contains at least one selected from hydrocarbons, alcohols, ketones, and chlorinated hydrocarbons.