JP4063345B2 - Cleaning agent for resin discharge device - Google Patents

Description

【００１９】
【発明の効果】
本発明の洗浄剤は、各種電気・電子部品、医療器部品、自動車部品等をエポキシ、ウレタン、シリコーン、ポリエステルなどの樹脂で接合、充填、又は封止するために使用した樹脂吐出装置の洗浄剤として、優れた洗浄力を有すると共に引火点が高く、パッキンなどへの悪影響の少ない画期的なものである。しかも、ハロゲン原子を含まないのでオゾン層破壊の恐れが全くなく、環境への悪い影響も少ないため、１，１，１−トリクロロエタンの代替洗浄剤として極めて有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning agent suitable for cleaning a mixing portion and a nozzle portion of a resin discharge device.
[0002]
[Prior art]
In recent years, resin discharge devices have been widely used for joining, filling, or sealing various electric / electronic parts, medical device parts, automobile parts, and the like with resins such as epoxy, urethane, silicone, and polyester. The resin used in this application is often a two-component type (main agent and curing agent) that crosslinks and cures at around room temperature. The two components are automatically ratio-measured, mixed, stirred and discharged continuously. It can be done. However, when using a two-component type resin, when the work is interrupted, such as at lunch break or at the end of a day's work, the mixing unit and nozzle unit should be installed before the resin is cured in the discharge device. Need to be cleaned.
[0003]
For these cleanings, 1,1,1-trichloroethane has been widely used because it has many characteristics such as nonflammability, low toxicity and excellent solubility.
However, it is an excellent cleaning agent, but it has been found that it will destroy the ozone layer in the stratosphere.
[0004]
Under such circumstances, there is an increasing expectation for a non-halogen-based alternative cleaning agent that is safe and has little impact on the environment, but the present situation is that a product that satisfies all the required performances has not yet been obtained. For example, acetone has an excellent detergency, but has a low flash point, and is dangerous to use for washing resin discharge devices having many ignition sources such as heaters. Further, although adipic acid, succinic acid and / or dimethyl ester of glutaric acid has a high flash point of around 100 ° C., the detergency of some resins, particularly resins with a large amount of filler added, is still one step.
[0005]
[Problems to be solved by the invention]
The present invention provides a non-halogen-based cleaning agent for a resin discharge device that has excellent cleaning power, has a low risk of ignition, and has little adverse effect on the environment.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above-mentioned problems, the present inventor is suitable as a resin discharge device by adding an appropriate amount of N-methylpyrrolidone to adipic acid, succinic acid, or dialkyl ester of glutaric acid. The present inventors have found that a cleansing agent can be obtained, and have made the present invention.
[0007]
That is, the present invention is a cleaning agent for a resin discharge device, which is a mixed solvent composed only of the following components (a) and (b).
(A) at least one selected from the group consisting of adipic esters of adipic acid, succinic acid, or glutaric acid alkyl groups having 1 to 4 carbon atoms (excluding diethyl succinate) 50 to 90% by weight
(B) N-methylpyrrolidone 10-50% by weight
When the cleaning agent of the present invention is used for cleaning the resin adhering to the resin discharge device, the resin discharge device is superior in cleaning power, has no fear of environmental pollution that destroys the ozone layer, and is safer (fire). As a cleaning agent, it is particularly suitable for cleaning a resin with a large amount of filler added, and the present invention will be described in detail below.
[0008]
The adipic acid, succinic acid, or dialkyl ester of glutaric acid used in the present invention can be used alone or as a mixture. As the alkyl group, those having 1 to 4 carbon atoms, that is, methyl, ethyl, normal propyl, isopropyl, normal butyl, isobutyl and the like are preferable. The blending amount of N-methylpyrrolidone is preferably 10 to 50% by weight in the total composition. If the blending amount is less than 10% by weight, the detergency is not sufficient, and if it exceeds 50% by weight, the elution of packings used in the resin discharge device is undesirably increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.
[0011]
[Example 1]
A sample was prepared by thoroughly mixing 1 g each of two-part epoxy resin ME-268 (filler added) manufactured by Nippon Pernox Co., Ltd. and curing agent HV-110. After standing for 10 minutes, a mixture of dimethyl ester of adipic acid, glutaric acid and succinic acid {trade name: DBE, manufactured by DuPont, hereinafter simply referred to as DBE (component (A))} to 70% by weight of this resin When 50 ml of a mixed solvent (cleaning agent) consisting of 30% by weight of N-methyl-2-pyrrolidone {hereinafter abbreviated as NMP (component (B))} was added and shaken for 10 minutes, the resin was completely dispersed.
[0012]
[Example 2]
Except for using Super (commercial grade / epoxy resin) manufactured by Cemedine Co., Ltd. instead of the two-component epoxy resin of Example 1, the same operation as in Example 1 was performed, but most of the resin was dissolved.
[0013]
[Example 3]
When the same operation as in Example 1 was performed except that DBE {component (A)} was changed to diisopropyl succinate in the solvent (cleaning agent) of Example 1, the resin was completely dispersed.
[0014]
[Comparative Example 1]
When the solvent (cleaning agent) of Example 1 was changed to only DBE {component (A)} and the same operation as in Example 1 was performed, the resin was hardly dispersed.
[0015]
[Comparative Example 2]
When the same operation as in Example 2 was performed by changing the solvent (cleaning agent) in Example 1 only to DBE {component (A)}, the resin was hardly dissolved.
[0016]
[Example 4]
A cleaning agent in which the mixing ratio of DBE {(A) component} and NMP {(B) component} is changed as shown in Table 1, fluoro rubber (trade name Viton, manufactured by DuPont) and ethylene propylene rubber (hereinafter referred to as EP rubber) (Abbreviated) was added to each sample, and the dissolution rate after immersion for 24 hours at 50 ° C. was measured. The dissolution rate was a value obtained by dividing the amount of evaporation residue eluted in the solvent by the weight before immersion.
[0017]
The results are shown in Table 1. When the amount of NMP added exceeded 50% by weight, the rubber elution amount increased rapidly.
[0018]
[Table 1]

[0019]
【The invention's effect】
The cleaning agent of the present invention is a cleaning agent for a resin discharge device used for joining, filling, or sealing various electrical / electronic parts, medical device parts, automobile parts, etc. with a resin such as epoxy, urethane, silicone, polyester, etc. As well as having excellent detergency and a high flash point, it is an epoch-making product with little adverse effect on packing and the like. In addition, since it does not contain a halogen atom, there is no risk of ozone layer destruction and there is little adverse effect on the environment, so it is extremely useful as an alternative cleaning agent for 1,1,1-trichloroethane.

Claims (1)

A cleaning agent for a resin discharge device, which is a mixed solvent composed of only the following components (a) and (b)
(A) At least one selected from the group consisting of adipic acid, succinic acid, or dialkyl esters of alkyl groups having 1 to 4 carbon atoms of glutaric acid (excluding diethyl succinate), 50 to 90% by weight
(B) N-methylpyrrolidone, 10-50% by weight.