JP3262829B2 - Cleaning agent for paste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent for removing various solder pastes, conductive pastes, resistive pastes and the like used in a process of manufacturing electric and electronic parts.

[0002]

2. Description of the Related Art Conventionally, in the electric and electronic industries, when mounting components on a substrate in a manufacturing process of a surface mount printed wiring board, various solder pastes are applied in advance using various printing screens or the like. , Heat fusion. In addition, in order to form a metal pattern such as various conductors, resistors, and derivatives on the substrate, pastes of various conductors, resistors, and derivatives (hereinafter, referred to as “printing screens”) using various printing screens or the like in advance.
A thick film paste is applied, and a process such as heating, baking, or exposure is performed, and components are mounted, or processes such as glass coating and plating are performed.

[0003] Unnecessary residues of various solder pastes and various thick film pastes printed on a substrate and subjected to heat fusion, baking, or exposure, etc., remain on a printed circuit or a printed wiring board, resulting in poor conductivity or poor conductivity. Because it causes corrosion,
Usually, after such a treatment, it is appropriately removed by washing. Known techniques for removing these include, for example, a chlorofluorocarbon-based solvent containing Freon 113 or the like disclosed in Japanese Patent Application Laid-Open No. 2-145698 or a methyl-chloroform solvent or the like described in Japanese Patent Application Laid-Open No. 3-97797. There is. Also, there is a method as disclosed in Japanese Patent Application Laid-Open No. 3-62895, in which a specific non-chlorine-based organic solvent is used for washing, followed by rinsing with warm water or another solvent.

[0004] With the advancement of science and technology, as the density of component mounting on the substrate has increased, the printing screen has been required to have minute holes. Therefore, various solder pastes and various thicknesses printed on the substrate have been required. It is becoming increasingly difficult to maintain the precision of the pattern dimensions and the like of the film paste. In order to maintain these precisions, various solder pastes and various thick film pastes, which have not been subjected to heating, baking, exposure, etc., on a screen or a substrate left by various printing operations. It is indispensable to wash and remove the residue of the unprocessed paste in a timely manner after each operation. (In the art, untreated paste is sometimes referred to as raw paste.) Untreated paste (raw paste)
Has a completely different composition from a paste that has been subjected to a treatment such as heating, baking, or exposure, so that its solubility in a solvent is significantly different. In addition, the chlorofluorocarbon-based solvent, the chlorinated solvent, or the specific non-chlorinated organic solvent mentioned in the above-mentioned known technique is for the purpose of removing the residue on the substrate that has been subjected to a treatment such as heating, baking, or exposure. For this reason, a sufficient effect has not been obtained in terms of the cleaning performance of the untreated paste (raw paste) and other performances, but it is currently used in practice.

[0005]

At present, with increasing awareness of social environmental problems, chlorofluorocarbon-based solvents such as chlorofluorocarbon-based solvents such as chlorofluorocarbon 113 and chlorofluorocarbons have been used worldwide as ozone depleting substances. , Because it has been agreed that its manufacture and use will be banned in the near future,
It has become necessary to radically change the cleaning agent using these solvents. Furthermore, the treatment of the rinse water discharged in the cleaning system has been raised as one of the environmental issues. Under such circumstances, in the industrial field where it is necessary to wash untreated paste (raw paste) on various screens or various substrates, there is a demand for environmental safety, cleanability, practicality, etc. No cleaning agent capable of completely satisfying the performance has been found yet, and as soon as possible, a cleaning agent completely satisfying the required performance has been demanded.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the state of the art as described above, and as a result, have found that a hydrocarbon ether having the boiling point range is added to a glycol ether represented by the general formula (1). When used together at a certain ratio, the cleaning property for untreated paste (raw paste) is excellent, the treatment of the contaminant cleaning agent is remarkably easy, the water rinsing is unnecessary, the drying property after cleaning is good, and The present inventors have found that they are safe and can be used as practical cleaning agents, and have completed the present invention.

That is, the present invention relates to (a) a method in which the boiling point is 160 ° C.
5 to 50% by weight of a saturated aliphatic hydrocarbon and / or a saturated alicyclic hydrocarbon in the range of 280 ° C, and (b) 5% by weight of a glycol ether represented by the general formula (1).
0 to 95% by weight, containing no surfactant
Use in electrical and electronic component manufacturing process, characterized in that
Paste for cleaning agent that is needed. R ₁ — (O—C _n H _2n ) _m —O—R ₂ (1) (wherein R ₁ and R ₂ represent H, a hydrocarbon group or an acyl group, and R ₁ and R the total number of carbon atoms of ₂ 1-2
0, n represents 2 or 3, and m represents an integer of 1 to 3. )Less than,
The present invention will be described in detail.

The cleaning agent of the present invention has a boiling point of 160 ° C.
Among the saturated aliphatic hydrocarbons and saturated alicyclic hydrocarbons in the range of 280 ° C., the saturated aliphatic hydrocarbons may be linear or branched, and the saturated alicyclic hydrocarbons It may be a ring alone or a ring in which a linear or branched hydrocarbon group is bonded. Each of these may be used alone or as a mixture of two or more.

The boiling point is preferably in the range of 160 ° C. to 280 ° C., more preferably 180 ° C. to 2 ° C.
40 ° C. Within this range, there is a low risk of ignition at a normal washing temperature, and an appropriate viscosity as a detergent is maintained, which is practical. Its boiling point is 160
If the temperature is lower than ℃, the danger of ignition becomes extremely high, and furthermore, it is not practical because the use conditions are extremely limited. When the boiling point exceeds 280 ° C., the viscosity as a detergent increases, so that not only the incomplete removal of the detergent from the object to be washed but also the drying property after the washing is deteriorated, Again, this is not practical.

Further, the content of the saturated aliphatic hydrocarbon and the saturated alicyclic hydrocarbon having the same boiling point is preferably 5 to 50% by weight, more preferably 10 to 30% by weight. Within this range, the dirt dissolves in the vehicle (the state in which some components in the untreated paste are uniformly dissolved in the detergent, and other components are dispersed or precipitated in the detergent is called vehicle dissolution). When the cleaning agent is filtered, it can be easily operated, the stains (hereinafter referred to as "filtrate") that have been collected can be easily discarded, and the filtrate can be reused as the cleaning agent again. It is possible. If the content is less than 5% by weight, when filtering the cleaning agent in which the dirt is dissolved in the vehicle, the filter substance has a remarkably high viscous tone, a considerably fine mesh is required for the filtration filter, and the filtration pressure is high. In addition, the operation becomes extremely difficult, and such highly viscous dirt adheres and accumulates in a washing tank or a pipe of the washing machine, causing a failure of the washing machine, which is not practical. In addition, 50% by weight
If it exceeds, the removal of dirt from the article to be washed may be incomplete, and in this case too, it is not practical.

The saturated aliphatic hydrocarbons and saturated alicyclic hydrocarbons having a boiling point in the range of 160 ° C. to 280 ° C. include, for example, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, menthan, bicyclohexyl, cycloalkyl Dodecane, decalin, 2,2,4
4,6,8,8-heptamethylnonane, 2,6,10,
There are 14-tetramethylpentadecane and the like, and in terms of trade names, for example, trade name 0 Solvent (Nippon Oil Co., Ltd.)
L) (boiling point: 182.5 ° C to 212 ° C; hereinafter, the terms of boiling point are abbreviated); M (219 ° C to 247 ° C); H (244 ° C)
-262 ° C), trade name Fukull High Solvent (manufactured by Fujikosan Co., Ltd.) 160 (160 ° C-202 ° C), 200
(202 ° C to 240 ° C), 240 (241 ° C to 268 ° C)
° C), trade name Exol (manufactured by Exxon Chemical Co., Ltd.) D6
0 (186 ° C to 216 ° C), D80 (204 ° C to 232 ° C)
° C), D100 (235 ° C to 262 ° C) and the like.

The glycol ether represented by the general formula (1) may be used alone or as a mixture of two or more kinds. R ₁ and R _{2 each} represent H, a hydrocarbon group or an acyl group. And the total number of carbon atoms of R ₁ and R ₂ is from 1 to 2
Compounds in which 0 and n are 2 or 3 and m is an integer of 1 to 3 are used. R ₁ and / or R ₂ is a hydrocarbon group and / or an acyl group, and a total of 4 to 12 carbon atoms of R ₁ and R ₂ is a compound, or a mixture of two or more compounds. It is more effective and preferable in terms of detergency and the like.

When the total number of carbon atoms of R ₁ and R ₂ is less than 1, or more than 20, or n and m exceed 3, the melting point becomes high. Because the stability becomes worse and the viscosity as a detergent increases,
Either case is not preferable because the cleaning property is deteriorated or the drying property after cleaning is significantly deteriorated. Further, the glycol ether represented by the general formula (1)
0 to 95% by weight is preferable, and a more preferable range is 70 to 95% by weight.
90% by weight. When the glycol ether represented by the general formula (1) is more than 95% by weight or less than 50% by weight, the saturated aliphatic hydrocarbon and the saturated alicyclic hydrocarbon in the boiling range are not more than 5% by weight. If it is less than 50% by weight or exceeds 50% by weight, it is not practical.

As the glycol ether represented by the general formula (1), for example, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol dibutyl ether, ethylene glycol dihexyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl Ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monohexyl ether acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol Dibutyl ether, diethylene glycol dihexyl ether, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monohexyl ether acetate, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol Monoethyl ether, propylene glycol diethyl ether, dipropylene glycol diethyl ether, tripropylene glycol dimethyl ether, ethylene glycol monobutyl ether butyrate, diethylene glycol monobutyl ether hexylate, diethylene glycol Monoethyl ether octoate, ethylene glycol diacetate,
Diethylene glycol diacetate, triethylene glycol diacetate, ethylene glycol dipropionate, dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, ethylene glycol monoisoamyl ether, ethylene glycol diisoamyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monomethyl Ether, tripropylene glycol monoethyl ether,
And the like.

(A) a saturated hydrocarbon having a boiling point in the range of 160 ° C. to 280 ° C. and / or
Or, saturated alicyclic hydrocarbons and (b) glycol ethers represented by the general formula (1) are compounds which are environmentally safe and have no influence such as destruction of the ozone layer and the like. For the first time when it is used as an essential component at this content ratio, it has both excellent cleaning properties and easy treatment of a contaminated cleaning agent, furthermore, it does not require water rinsing, has good drying properties after cleaning, and is a practical cleaning agent. It can be.

The articles to be washed using the cleaning agent of the present invention include, for example, various printing screens such as a metal screen and a mesh screen, accessories of various printing screens such as a squeegee, and crow epoxy. There are various printed boards such as boards, paper epoxy boards, paper phenol boards, ceramic boards, and alumina boards, and electronic components mounted on them. The material is metal (stainless steel, iron, copper, zinc, brass, bronze, Aluminum, nickel, etc.) and resins (epoxy resin, phenolic resin, polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polyacetal, polyvinyl chloride, nylon 6,
Nylon 66, polymethyl methacrylate, silicone rubber, fluorine rubber, urethane rubber, neoprene rubber, styrene-butadiene rubber, etc.).

In the cleaning agent of the present invention, various kinds of stability may be used as necessary, for example, in order to maintain the liquid stability of the cleaning agent or to improve the workability, as long as the effect is not impaired. Agent,
Additives, defoamers and the like can be added. As stabilizers, additives, defoamers, etc., alcohols, ethers, esters, acetals, ketones, fatty acids, nitroalkanes, amines, amides, ethanolamines, benzotriazoles, Examples include unsaturated hydrocarbons and silicon compounds.

When a screen or printed circuit board to which a solder paste or a thick film paste is adhered using the cleaning agent of the present invention, for example, it is cleaned in a cleaning tank containing the cleaning agent of the present invention. Next, rinsing with a rinsing tank containing the cleaning agent of the present invention, and finally, a method such as drying with warm air such as nitrogen or air, etc., can be carried out effectively for continuous cleaning. It is. In the cleaning tank and the rinsing tank, not only immersion cleaning and immersion rinsing but also a combination of rocking, ultrasonic wave, spray in liquid, shower and the like is more effective in cleaning performance and the like.

In the cleaning system using the cleaning agent of the present invention, the rinsing liquid in the rinsing tank may be alcohol, for example, methanol, ethanol, isopropyl alcohol or the like instead of using the cleaning agent of the present invention. . When alcohol is used as the rinsing liquid, drying may be performed by warm air or the like, but drying may be performed by exposing the object to be washed to such steam.

[0020]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to only these Examples.

[0021]

Example 1 Evaluation of Solder Paste Detergency; a. Two-tank type washing machines equipped with an ultrasonic oscillator were charged with cleaning agents 1 to 10 shown in Table 1, and the first tank was used as a cleaning tank.
The second tank was a rinsing tank, and the temperature of each tank was 40 ° C.

(B) A solder paste printing screen (comprising a metal part and a resin part, having a minimum opening of 0.2 mm, 200 mm × 200 mm) is coated with various solder pastes (trade name: HRS-7010, manufactured by Tamura Corporation).
N, trade name: HQ-1025SH] was prepared by uniformly adhering about 10 g, and used as an object to be washed. C. The object to be washed was immersed in a washing tank and washed while applying ultrasonic waves.

(2) After removing dirt, the object to be washed was immersed in a rinsing bath and rinsed while applying ultrasonic waves. (E) Air was dried by sending air to the object to be washed at room temperature. F. The washability of the object to be washed was evaluated by the washing time in the washing tank. Table 2 shows the results.

[0024]

[Comparative Example 1] Evaluation of solder paste cleaning property; cleaning agents 11 to 17 shown in Table 1 were charged into a two-tank type cleaning machine equipped with an ultrasonic oscillator, and the same procedure as in Example 1 was performed. did. Table 2 shows the results.

[0025]

Example 2 Evaluation of treatment of solder paste contamination cleaning agent; In each of the prepared cleaning agents 1 to 10, each of the solder pastes used in the evaluation of the solder paste cleaning property was dissolved in a 50% by weight vehicle, and this was used using a glass filter (standard maximum pore diameter: 10 to 15 μm). The solution was suction-filtered, and its filterability (processability) was evaluated. Table 2 shows the results.

[0026]

Comparative Example 2 Evaluation of Treatment of Solder Paste Contaminant Cleaning Agent; The cleaning was carried out in the same manner as in Example 2 using the cleaning agents prepared in each of Examples 11 to 17. Table 2 shows the results.

[0027]

Example 3 Evaluation of Detergency of Thick Film Paste; 1
A screen for printing thick film paste (comprising a metal part and a resin part, having a minimum opening of 0.1 mm, 200 mm × 200 m)
m) various thick film pastes [Asahi Chemical Laboratory Co., Ltd.
[Trade name: LS-500, trade name: ACP-020J] The same thing as in Example 1 was used except that about 10 g was uniformly adhered, and the washing property of the article to be washed was evaluated. Table 3 shows the results.

[0028]

Comparative Example 3 Evaluation of Detergency of Thick Film Paste; 1
The cleaning was performed in the same manner as in Example 3 using the cleaning agents prepared in each of Examples 1 to 17. Table 3 shows the results.

[0029]

Example 4 Evaluation of Treatment of Thick Film Paste Contaminated Cleaning Agent; Example 3 was applied to each of the prepared cleaning agents 1 to 10.
The same procedure as in Example 2 was carried out except that the thick film paste used in Example 2 was used, and its filterability (processability) was evaluated. Table 3 shows the results.

[0030]

Comparative Example 4 Evaluation of Treatment of Thick Film Paste Contaminant Cleaning Agent; The cleaning was carried out in the same manner as in Example 4 using the cleaning agents prepared in each of Examples 11 to 17. Table 3 shows the results.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

The cleaning agent of the present invention is safe for the environment and has no problem in occupational health.
It is a practical cleaning agent that has the easiness of treating a contaminated cleaning agent, does not require water rinsing, and has good drying properties after cleaning. In practice, it can be a cleaning agent that replaces conventional cleaning agents that use fluorocarbon or chlorine solvents.

Continuation of the front page (56) References JP-A-4-59898 (JP, A) JP-A-61-293274 (JP, A) JP-A-57-202399 (JP, A) JP-A-59-176398 (JP, A) JP-A-4-63897 (JP, A) JP-A-3-62896 (JP, A) JP-A-3-97792 (JP, A) JP-A-3-152197 (JP, A) 4-341592 (JP, A) JP-A-5-98294 (JP, A) JP-A-6-49493 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C11D 1/00 -17/08 C23G 5/02-5/036

Claims (1)

(57) [Claims] (1) 5 to 50% by weight of a saturated aliphatic hydrocarbon and / or a saturated alicyclic hydrocarbon having a boiling point in the range of 160 ° C. to 280 ° C., and (b) a compound represented by the general formula (1) A cleaning agent for paste used in the production process of electric and electronic parts , which contains 50 to 95% by weight of the glycol ether represented by the formula (1) and does not contain a surfactant . R ₁ — (O—C _n H _2n ) _m —O—R ₂ (1) (wherein R ₁ and R ₂ represent H, a hydrocarbon group or an acyl group, and R ₁ and R the total number of carbon atoms of ₂ 1-2
0, n represents 2 or 3, and m represents an integer of 1 to 3. )