JPH0463897A - Flux cleaning agent - Google Patents

Abstract

PURPOSE:To obtain the title cleaning agent with a low b.p. which does not destroy ozone and to improve degreasing and finishing performances by incorporating a 3-4C alcohol, n-octane, ethylcyclohexane and/or n-nonane. CONSTITUTION:One or more 3-4C alcohols (e.g. n-propanol) and one or more compd. selected from n-octane, ethylcyclohexane and n-nonane are mixed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flux cleaning agent for removing flux applied during soldering to strengthen the bonding force between the solder and a base material after soldering. It is.

[Conventional technology]

Conventionally, in the field of electrical and electronic industries, flux is applied in advance in order to firmly bond solder and base material in the manufacturing process of printed circuits or printed wiring boards. If this flux remains on the printed circuit or printed wiring board, it will cause poor conductivity or corrosion, so it is usually washed off with an organic cleaning agent after soldering. Freon 113 or methyl chloroform has conventionally been used as this cleaning agent. These solvents have a great ability to dissolve flux and are nonflammable, so they are widely used.

[Problem that the invention is trying to solve]

However, as society's awareness of environmental issues increases, there is a movement to regulate the discharge of environmentally destructive substances into the atmosphere and water systems. For example, fluorocarbon solvents (5 types of specified fluorocarbons:
CFCll, CFCl2, CFCll3, CFCll4
, CFCll5) and methyl chloroform are being restricted in their use as ozone layer depleting substances.

Under such circumstances, industries that use Freon 113 or methyl chloroform are in need of a flux cleaning agent that can replace the solvent as soon as possible.

[Means to solve problems]

The present inventors have discovered that Freon 1 used in flux cleaning agents.
13, or as a result of repeated research on cleaning agents to replace methyl chloroform, we found that one or more types of alcohols having 3 to 4 carbon atoms, N-octane, ethylcyclohexane, n-
A composition containing one or more types selected from nonane as an essential component is a conventional flux cleaning agent (Freon 1).
The present inventors have discovered that the present invention is a cleaning agent that exhibits high cleaning performance and finish quality comparable to those of 13 and methyl chloroform), and based on this knowledge, the present invention has been completed.

That is, the present invention essentially includes (1) one or more alcohols having 3 to 4 carbon atoms, and (2) one or more selected from n-octane, ethylcyclohexane, and n-nonane. This is a flux cleaning agent characterized by containing it as a component.

In the present invention, the composition of the alcohol having 3 to 4 carbon atoms and one or more of n-octane, ethylcyclohexane, and n-nonane is such that the concentration of both forms an azeotropic composition. This is very preferable because it prevents changes in the liquid and the liquid can be easily regenerated.

Examples of the alcohol having 3 to 4 carbon atoms used in the present invention include n-propanol, isopropanol, n-butanol, S-butanol, isobutanol, and t-butanol. These may be used alone or in combination of two or more.

Normally, hydrocarbon solvents alone have high degreasing performance for oil, but hydrocarbon solvents that meet the physical properties (low boiling point) necessary to use conventional equipment without any modification. All have low flash points and are not practical.

On the other hand, substances with high flash points also have high boiling points, and the reality is that they cannot be used as is in conventional equipment. - The composition of the present invention is characterized by containing as essential components one or more alcohols having 3 to 4 carbon atoms and one or more selected from n-octane, ethylcyclohexane, and n-nonane. Therefore, this composition forms an azeotropic composition in the boiling state, so that a sufficient amount of hydrocarbons can exist even in the vapor layer, and therefore, sufficient cleaning ability can be obtained. It is a composition that can be used with conventional equipment almost without modification.

The combination of essential components in the present invention can be arbitrarily changed depending on the material and form of the object to be washed and the type of dirt.

Furthermore, various stabilizers and additives can be added to the composition of the present invention in order to maintain the stability of the liquid, improve the stability against the objects to be washed, or improve the dissolving power. Examples of stabilizers and additives include hydrocarbons, alcohols, ethers, acetals, esters, ketones, fatty acids, nitroalkanes, amines, amides, glycols, and aminoethanols. , benzotriazoles, and the like.

〔Example〕

Hereinafter, the present invention will be specifically explained using Examples and Comparative Examples. The cleaning methods in Examples and Comparative Examples are as follows.

Cleaning method - ■ A capacity 1.00 (W) equipped with a cooling pipe as shown in Figure 1.
3 hard glass cleaners (1st tank, 2nd tank, 3rd tank)
The composition of the present invention or the comparative solvent 30 (W
The first tank was a boiling tank, the second tank was a cooling tank (room temperature), and the third tank was a steam tank.

■ Apply various oils to the items to be washed (50 mm x 50 mm square SUS plates) [press oil (manufactured by Nippon Oil Co., Ltd. (AT), product name: Unipres ER-500), drawing oil (manufactured by Idemitsu Sekiyu Co., Ltd. (made by Kiki, product name: Daphne) Master Draw 522WD):]
0. A sample was prepared in which 10g was uniformly applied.

■ The items to be washed were immersed in each type for one minute (however,
In the third tank, the items to be washed are simply put into the steam layer).

■ The weight of the items to be washed was measured, the amount of residual oil was measured, and the cleanliness of the appearance was visually judged.

Examples 1-7 A cleaning experiment was conducted on the compositions shown in Table 1.

The results are shown in Table 3.

Comparative examples 1 to 6 Cleaning experiments were conducted using the solvents shown in Table 2.

The results are shown in Table 3.

Table 1 [Effects of the Invention] The composition of the present invention has degreasing performance and good finishing properties comparable to conventional fluorocarbon-based and chlorinated solvents, and furthermore,
Does not destroy ozone. Furthermore, since the composition of the present invention can be easily recovered by boiling or distillation in the washing machines and distillers used for conventional fluorocarbon and chlorine solvents, conventional equipment can be used almost as is. You can.

Furthermore, since the composition of the present invention has a low boiling point, it is easy to dry the items to be washed, so there is no need for steps such as water rinsing to remove the cleaning agent from the items to be washed during the work process. . Therefore, there is no fear that the water environment will be contaminated by wastewater.

Therefore, the composition of the present invention is practically an excellent degreasing detergent that can replace conventional fluorocarbon-based and chlorinated solvents.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a method of cleaning objects to be washed using cleaning agents of Examples and Comparative Examples. Part ■ Rhinoceros - Tank Kudan Atsumisu Procedural Amendments Voluntary September 1990 Tsunodate

Claims (2)

[Claims] 1. (1) One or more types of alcohols having 3 to 4 carbon atoms, and (2) A flux cleaning agent characterized by containing one or more selected from n-octane, ethylcyclohexane, and n-nonane as an essential component.