JPH059499A - Cleaning agent composition - Google Patents

Abstract

PURPOSE:To provide a cleaning agent compsn. which in excellent in cleaning acution as well as safety capable of substituting for chlorinated solvents causative of the ozone layer depletion and is used for removal of a solder flux adherent to a printed board. CONSTITUTION:A cleaning agent compsn. for electronic parts comprises an adduct of 2-4mol of ethylene oxide with a 2-4 C satd. aliph. alcohol, and an adduct of 1-3mol of ethylene oxide with a 6-8 C satd. aliph. alcohol.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition for electronic parts, and more particularly to a cleaning composition used for removing solder flux from a printed circuit board.

[0002]

2. Description of the Related Art As a conventional cleaning agent for cleaning a solder flux attached to a printed circuit board, for example, a Freon solvent represented by CFC-113 or a chlorine-based solvent represented by 1,1,1-trichloroethane is mainly used. It was

[0003]

However, in such a conventional CFC-113 or 1,1,1-trichloroethane, it is necessary to severely reduce the use as a causative substance that destroys the ozone layer. Since it has become impossible to use for cleaning, alternative cleaning agents have been widely demanded. For alternative cleaning, alternative CFCs with or without ozone depletion potential, water-based cleaning agents containing alcohol or hydrocarbon oil as a main component, or water-based cleaning agents containing alkali as a main component have been widely proposed. However, these CFC cleaning alternatives have not reached a level that is sufficiently satisfactory in terms of safety, cleaning performance, and economical efficiency, and alcohol (based) cleaning has a low flash point, and there is concern about operational safety. The water-based cleaning mainly composed of hydrocarbon oil or the water-based cleaning composition mainly composed of alkali has a problem that selectivity of the material to be cleaned, that is, the cleaning material itself may remain due to influence on the material to be cleaned. . Further, it has been proposed that an alkylene oxide having 2 to 4 carbon atoms is added to an alcohol having 6 to 22 carbon atoms as disclosed in JP-A-3-62895. The sufficient cleaning effect cannot be obtained.

[0004]

The present invention has been made in view of the above-mentioned conventional problems. That is, it is a detergent composition for electronic parts, which comprises an ethylene oxide 2-4 mol addition product of a C2-4 aliphatic saturated alcohol and an ethylene oxide 1-3 mol addition product of a C6-8 aliphatic saturated alcohol. .

Alcohols used in the aliphatic saturated alcohol having 2 to 4 carbon atoms and 2 to 4 moles of ethylene oxide of the present invention include ethyl alcohol, propyl alcohol and butyl alcohol. Alcohols used for 1 to 3 mol of aliphatic saturated alcohol ethylene oxide having 6 to 8 carbon atoms include hexyl alcohol, heptyl alcohol, and 2 ethylhexyl alcohol. Also, H
Examples of the nonionic surfactant of LB8 to 12 include alkylphenyl ether having an oxyalkylene chain having 2 to 4 carbon atoms, alkyl ether, polyoxyethylene polyoxypropylene block polymer, sorbitan fatty acid ester, sucrose fatty acid ester and the like. To be

In addition to the above-mentioned components, as an optional auxiliary component,
Amines such as alkanolamine and cyclohexylamine, anionic surfactants such as fatty acid salts, alkylbenzene sulfonates, and dialkylsulfosuccinic acid ester salts, and amphoteric surfactants such as alkylcarboxybetaines, alkylaminocarboxylic acids, and alkylimidazolines, or , Alkylpicolinium chloride, alkyltrimethylammonium chloride, and other cationic surfactants are added.

The ethylene oxide adducts of aliphatic saturated alcohols having 2 to 4 carbon atoms and the ethylene oxide adducts of aliphatic saturated alcohols having 6 to 8 carbon atoms exhibit excellent cleaning effect by combining the two groups. The former does not exhibit good effects except when the number of moles of ethylene oxide added is 2 to 4, and the latter is other than the number of moles of 1 to 3 added.
Further, as the blending amount of these two groups, in the total aliphatic saturated alcohol, ethylene oxide 2 to 4 mol adduct of aliphatic saturated alcohol having 2 to 4 carbon atoms is 70 to 95% by weight, and fat having 6 to 8 carbon atoms is used. Ethylene oxide of group saturated alcohol 1-
When the 3 mol adduct is 5 to 30% by weight, or the former is 5 to 3%
When the amount of the latter is 0% by weight and the amount of the latter is 70 to 95% by weight, particularly excellent detergency can be exhibited.

Further, 80 to 95 parts by weight of the above two detergent compositions and 0.1 to 5 of HLB 8 to 12 nonionic surfactants.
Even when the composition is composed of 5 parts by weight of water and 5 to 15 parts by weight of water, more excellent detergency can be exhibited. Nonionic surfactant is H
When the LB is 8 to 12, the cleaning effect is excellent, and when the HLB is less than 8, the cleaning property or the residual of the cleaning agent itself may be a problem, and when the HLB is more than 12, foaming occurs in the cleaning operation. When the amount of water exceeds 15 parts, the detergency is poor, and when the amount of water is less than 5 parts, the detergency of the cleaning composition is manifested and the handling becomes difficult.

The cleaning agent of the present invention is used as it is, or after being diluted with water, it is subjected to cleaning treatment of solder flux that adheres to or remains on the printed circuit board based on a cleaning method such as immersion (swing), ultrasonic waves or spraying. Can be done.

[0010]

The cleaning composition for electronic parts of the present invention has 2 to 2 carbon atoms.
By using both the ethylene oxide adduct of aliphatic saturated alcohol of 4 and the ethylene oxide adduct of aliphatic saturated alcohol of 6 to 8 carbon atoms in combination, an excellent cleaning effect is exhibited although the mechanism is not clear. If either of these is missing, the desired cleaning effect cannot be obtained.

[0011]

EXAMPLES The present invention will be described in detail with reference to examples. Example of effect-1 An IC chip mounted, oil-based flux adhesion model substrate is immersed in each of the cleaning agents shown in Tables 1 and 2 at 50 ° C for 20 seconds, and then spray washed at 1 ° C / cm ² pressure at 50 ° C for 40 seconds. To do. Then, after post-rinsing treatment and drying, the residual flux is measured by an ultraviolet spectrophotometric method, and the cleaning property (%) is determined by the following formula. The results are shown in Table 3. Detergency (%) = (Adhesive oily flux (mg) -Residual oily flux (mg)) / Adhesive oily flux (mg) x 100

Effect Example-2 A predetermined amount of cream solder material is applied on a copper plate and heat-treated to prepare a model contaminated plate. Ultrasonic cleaning is performed at 55 ° C. for 40 seconds with each of the cleaning agents in Tables 1 and 2, then post-rinse treatment is performed, and after drying, evaluation is performed by the residual flux ultraviolet spectrophotometry in the same manner as in Effect Example-1. The results are shown in Table 3.

Effect example-3 The same cleaning treatment as in effect example-2 is performed, and the rinse behavior in running water at 40 ° C is visually evaluated according to the following criteria. The results are shown in Table 3.
Shown in. ◎ Exhibits excellent rinsing property. ○ Good rinsing property is exhibited. Fairly inferior in rinsing property. × It shows almost no rinsing property.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

[Table 3]

All of the cleaning compositions 1 to 3 of the present invention exhibit excellent detergency and excellent rinsing behavior due to residual cleaning agent. On the other hand, in the comparative detergent composition, in A), the aliphatic saturated alcohol having 2 to 4 carbon atoms has 1 carbon atom.
Therefore, the cleaning power is inferior. Since B) is propylene oxide of an aliphatic saturated alcohol having 2 to 4 carbon atoms, it has poor detergency and rinse behavior. C) has a low ethylene oxide addition mole number of an aliphatic saturated alcohol having 2 to 4 carbon atoms and is poor in detergency. In D), the number of moles of ethylene oxide added to the aliphatic saturated alcohol having 6 to 8 carbon atoms is high and the detergency is poor. In E), the ethylene oxide of the aliphatic saturated alcohol contains only 2 to 4 carbon atoms and the surfactant has a low HLB, and the detergency and rinse behavior are poor. In F), the ethylene oxide of the aliphatic saturated alcohol contains only 6 to 8 carbon atoms, and the HLB of the surfactant is high, and the detergency is particularly poor. G) has a relatively high detergency, but is a substance that causes ozone layer depletion, and H) has a relatively high detergency, but has a low flash point and has a problem in its handling. I) is an ethylene oxide adduct having 6 to 8 carbon atoms of an aliphatic saturated alcohol, and is inferior in detergency and rinsing property. The cleaning composition of the present invention does not correspond to a causative substance that destroys the ozone layer, exhibits the same cleaning effect as CFC-113, and is safe in handling and exhibits excellent cleaning power.

[0018]

The cleaning composition of the present invention is CFC-113.
Alternatively, the water-soluble detergent composition used for washing rosin-based flux such as 1,1,1-trichloroethane does not contain any substance causing ozone layer depletion and has no flash point as compared with alcohol-based detergent. It is easy to handle and has an excellent cleaning effect. It has less effect on the material to be cleaned than water-based cleaning agents mainly composed of hydrocarbon oil or alkaline water-based cleaning agents, and the removability, that is, the cleaning agent itself remains. It is extremely low and exhibits an excellent cleaning effect.

Claims (3)

[Claims] 1. A cleaning composition for electronic parts, which comprises an adduct of 2 to 4 mol of ethylene oxide with a saturated aliphatic alcohol having 2 to 4 carbon atoms and an adduct of 1 to 3 mol of ethylene oxide with an aliphatic saturated alcohol having 6 to 8 carbon atoms. object. 2. Among the ethylene oxide adducts of the total aliphatic saturated alcohol, 70 to 70% of (a) an ethylene oxide 2 to 4 mol adduct of an aliphatic saturated alcohol having 2 to 4 carbon atoms is used.
95 wt% and 5 to 30 wt% of an ethylene oxide 1 to 3 mol adduct of an aliphatic saturated alcohol having 6 to 8 carbon atoms,
Or (b) 5 to 30% by weight of an ethylene oxide 2 to 4 mol adduct of an aliphatic saturated alcohol having 2 to 4 carbon atoms and 70 to 1 to 3 mol of an ethylene oxide adduct of an aliphatic saturated alcohol of 6 to 8 carbon atoms. The cleaning composition for electronic parts according to claim 1, which comprises ˜95% by weight. 3. The cleaning composition 80 according to claim 1 or 2.
To 95 parts by weight, 0.1 to 5 parts by weight of nonionic surfactant of HLB 8 to 12 and 5 to 15 parts by weight of water, a cleaning composition for electronic parts.