JP2000119692A - Detergent for resin and cleaning method for resin discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a detergent excellent in deterging power against two-pack type curable resin components, safe to the human body, easy to handle and not corresponding to an ozone layer-depleting material by employing an alkylene oxide having blocked both ends with specific alkyl groups. SOLUTION: The objective detergent is one for two-pack type curable resin components in an uncured state and comprises a single compound of a component A represented by formula I. In the formula I, R1 and R3 are each independently a 1-3C alkyl; R2 is H or methyl; and (n) is an integer of 2-3. The detergent can further contain a compound (B) represented by formula II in addition to the component A. When the component B is jointly used, the content of the component A is preferably at least 50 wt.% and less than 100 wt.%, and the content of the component B is preferably more than 0 wt.% but not more than 50 wt.%. In the formula II, R1 is a 2-4C alkyl; R2 is H or methyl; and (n) is an integer of 2-3.

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 cleaning an uncured two-component curable resin component adhered to a mixing portion and a nozzle portion of a resin discharge device, and to use the cleaning agent. The present invention relates to a method for cleaning a resin discharge device.

[0002]

2. Description of the Related Art Conventionally, halogenated hydrocarbons such as methylene chloride have been used for cleaning a two-part curable resin discharge device. Halogenated hydrocarbons are substances causing ozone layer destruction. It is pointed out that its use is greatly restricted, and some halogenated hydrocarbons are concerned about safety to the human body. For this reason, mixed detergents containing cellosolves, carbitol solvents, petroleum hydrocarbons, N-methyl-2-pyrrolidone, organic acid esters, and the like have been used as substitutes for halogenated hydrocarbons. .

[0003]

Various substitutes as described above have been used as substitutes for halogenated hydrocarbons. However, some petroleum hydrocarbons have low flash points, such as cellosolves and the like. The pyrrolidone-based solvent needs to be handled with care because there is concern about safety to the human body. Further, in the waste liquid after cleaning using these cleaning agents, the cleaning agent and the resin liquid as a contaminant are mixed. Therefore, these waste liquids are usually treated and collected as industrial waste,
It is difficult to recover 100% of a highly volatile cleaning agent, and in many cases, it is released to the atmosphere as it is without being partially recovered. Further, the above-mentioned halogenated hydrocarbon substitute cleaning agent has a drawback that the cleaning power for a specific resin, for example, a silicone resin is low.

[0004] The present invention is a general-purpose cleaning method against contamination by a two-component curable resin component, and can exert an excellent detergency on a two-component curable resin component such as a silicone resin. An object of the present invention is to provide a cleaning agent which is safe and easy to handle and does not correspond to an ozone depleting substance.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such conventional problems, and is intended to provide a specific glycol ether and its acetate compound among various compounds having a detergency. It has been accomplished based on the finding that, when used, a detergency can be exerted on a wide range of two-component curable resin components including silicones.

That is, the resin detergent of the present invention is a detergent for an uncured two-component curable resin component, and the detergent has the following general formula (1):

[0007]

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Wherein R ¹ and R ³ are each independently an alkyl group having 1 to 3 carbon atoms, R ² is a hydrogen atom or a methyl group, and n is an integer of 2 to 3 (a) It is characterized by consisting of a single compound of the components.

The compound represented by the general formula (1) is excellent in cleaning properties against contamination by an uncured component of a silicone two-component curable resin in addition to urethane resin and epoxy resin, and It is safe for the human body and easy to handle, and does not fall under ozone depleting substances. Even if this compound is mixed into the resin component at the time of cleaning in a resin discharge device or the like, a small amount of the compound does not inhibit the curing of the resin. In addition, since this detergent is composed of a single compound of the component (a), it has the advantage that it can be reused for the above-mentioned applications simply by collecting waste liquid after use by distillation. Further, since the compound of the component (a) represented by the general formula (2) does not contain a hydroxyl group in the molecule,
Even if this compound is mixed into the resin component at the time of cleaning in a resin discharge device or the like, it does not adversely affect the curing of the resin.

[0010] Further, the resin detergent of the present invention comprises the above (a)
In addition to the components, the following general formula (2)

[0011]

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Wherein R ¹ is an alkyl group having 2 to 4 carbon atoms, R ² is a hydrogen atom or a methyl group, and n is an integer of 2 to 3). You may. Since the compound of the component (b) represented by the general formula (2) also does not contain a hydroxyl group in the molecule, even if this compound is mixed into the resin component during cleaning in a resin discharge device or the like, it adversely affects the curing of the resin. I will not give.

When the component (b) is used in combination, the content of the component (a) is 50% by weight or more and less than 100% by weight, and the content of the component (b) is more than 0% by weight and 50% by weight.
It is preferable that the content be not more than weight%. If the contents of the component (a) and the component (b) are out of this range, it is not preferable because the detergency for the silicone resin or the like cannot be exerted and the versatility as a detergent is reduced.

Further, the method for cleaning a resin discharge device of the present invention is a method for cleaning an uncured two-component curable resin component adhered to a mixing portion and a nozzle portion of a two-liquid curable resin discharge device. A method for cleaning a mixing section, a nozzle section, and the like of a resin discharge device using any of the above-described cleaning agents. If the cleaning is carried out by this method, even if the detergent is mixed into the two-component cured resin component, adverse effects such as inhibition of curing of the resin are less likely to occur, and therefore, no special consideration is required for the mixing of the detergent.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Contaminants to which the cleaning agent of the present invention is applied include, for example, urethane resins, epoxy resins,
It is a two-component curable resin component such as a silicone resin.

The cleaning agent of the present invention can clean metal parts, glass parts, mixing parts and nozzle parts of a resin discharge device to which these uncured resin components or each resin component before mixing adhere. .

The compound of the component (a) used in the detergent of the present invention is an alkylene oxide whose both ends are blocked with an alkyl group having 1 to 3 carbon atoms, that is, a compound represented by the general formula (1). As such a compound, specifically, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, dipropylene glycol dimethyl ether,
Examples thereof include dipropylene glycol diethyl ether, dipropylene glycol isopropyl ethyl ether, diethylene glycol isopropyl ethyl ether, triethylene glycol diethyl ether, and triethylene glycol isopropyl ethyl ether.

Even when these compounds are used in combination, the two-part curable resin has excellent detergency against contamination by uncured components, is excellent in safety to human bodies and the environment, is easy to handle, and is easy to handle. Although the advantage of the present invention that the possibility of inhibiting the curing of the resin is small even when the agent is mixed in the resin component is achieved, it is preferable to use these alone in view of the reusability by distillation recovery.

The compound of component (b) used in the detergent of the present invention is an alkylene oxide whose terminal is blocked with an alkyl group having 2 to 4 carbon atoms and an acetyl group, that is, a compound represented by the general formula (2). is there. As such a compound,
Specifically, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monoisopropyl ether acetate, diethylene glycol monobutyl ether acetate, triethylene glycol monoethyl ether acetate, triethylene glycol monopropyl ether acetate, triethylene glycol monoisopropyl ether acetate , Triethylene glycol monobutyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monopropyl ether acetate, dipropylene glycol monoisopropyl ether acetate, dipropylene glycol monobutyl ether acetate,
Examples thereof include tripropylene glycol monoethyl ether acetate, tripropylene glycol monopropyl ether acetate, tripropylene glycol monoisopropyl ether acetate, and tripropylene glycol monobutyl ether acetate.

In the above general formula (1), since the compound having n = 1 has a low flash point, there is concern about the safety in handling during washing, distillation, etc., the safety to the human body, and the like. Not preferred. On the other hand, when n is 4 or more, it is not preferable because the cleaning property is poor. When the number of carbon atoms in the alkyl group R ¹ is 5 or more, the flash point becomes higher, which may cause danger to the human body,
Although the possibility of an explosion or the like is reduced, the cleaning property is reduced, which is not preferable. In addition, the boiling point will be higher,
When used alone, it is not preferable because a great load is applied at the time of regeneration by distillation. When only the component (a) is used, the distillation for recovering and reusing the detergent is carried out by a vacuum distillation method or the like according to a known ordinary method, and conditions are appropriately set in view of the boiling point of the compound which is a component of the detergent. It is good to do it.

In the above general formula (2), too, the compound having n = 1 has a low flash point, so that safety in handling at the time of washing and the like, safety to the human body, and the like are not preferred. . On the other hand, when n is 4 or more, it is not preferable because the cleaning property is poor.

When cleaning is performed using the cleaning agent of the present invention, the cleaning effect can be obtained even when the cleaning liquid is used at room temperature. However, in some cases, the cleaning liquid is heated to about 40 ° C., brushing, ultrasonic waves, or the like. By using the physical operations described above in combination, it is expected that the cleaning property can be improved.

[0023]

EXAMPLES [Experimental Example 1] Solubility Experiment Urethane-based resin (Aimflex EF-243, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) which is a two-pack curable resin, epoxy-based resin (Nippon Pernox Co., Ltd.) And Epoxy Pernox ME) and 1 ml each of a silicone gel (SE-8019H, manufactured by Nippon Pernox Co., Ltd.) were prepared at the compounding ratios shown in Table 1.
After stirring for 1 minute, the solution was allowed to stand at room temperature for 1 day, and the dissolved state was observed. The dissolution state was evaluated visually. The results are shown in Table 1 below.

[0024]

[Table 1]

As is clear from Examples 1 to 3 in Table 1,
Dipropylene glycol dimethyl ether: diethylene glycol monobutyl ether acetate = 50:50
Also, it can be seen that when the mixing ratio of the dipropylene glycol dimethyl ether of the component (a) is more than 50% by weight, good detergency is exhibited not only for urethane resins and epoxy resins, but also for silicone gels. Example 4
As is clear from FIGS. 5 and 5, the detergent of dipropylene glycol dimethyl ether or diethylene glycol diethyl ether alone as the component (a) also shows good detergency not only for urethane resins and epoxy resins but also for silicone gels. You can see that.

On the other hand, Comparative Examples 1 and 2 using the monoether are inferior in cleaning properties, especially for silicone gel. Further, although the detergents of Comparative Examples 3 and 4 contain the component (a) and the component (b),
Since the ratio of the component (a) is less than 50% by weight, it can be seen that the detergency to silicone gel is particularly poor.

[Experimental Example 2] The two-liquid urethane resin component used in Experimental Example 1 was mixed and discharged at a rate of once every 3 seconds for one hour using a cleaning dispenser. Each cleaning liquid according to the example and the comparative example shown in FIG.
1 to wash the inside of the dispenser. After the washing, the inside of the resin liquid transport tube was observed, and the remaining state was evaluated based on the amount of the residue inside. Table 2 shows the results.

[0028]

[Table 2]

As is clear from Table 2, Examples 1 and 4
When a detergent is used, almost no residual amount of the two-component urethane resin component remains, which indicates that these detergents have good detergency. In contrast, the detergent of Comparative Example 1 had a large amount of residue, and the detergents of Comparative Examples 5 and 3 also had a small amount of residue.

[Experimental Example 3] Curing inhibition test Two-part urethane resin (UF-820 manufactured by Sanyuresin Co., Ltd.)
Each of the detergents shown in Table 3 was added to 15 g of the resin component liquid (oligomer) in 0.5% by weight (75 mg) based on the resin.
And after stirring for 1 minute, heated to 60 ° C. and cured to observe the state of the resin. Table 3 shows the results.

[0031]

[Table 3]

As shown in Table 3, the cleaning agents of Examples 6 and 4 had less influence on the curing of the resin than the alcohols and glycol monoethers having a hydroxyl group in the molecule according to Comparative Examples. Therefore, it has been clarified that even if a considerable amount is mixed in the resin component, the cleaning agent of the present invention does not cause inhibition of resin curing.

[0033]

As described above, the resin cleaner of the present invention is excellent in cleaning performance against contamination by the uncured components of the two-pack curable resin. In addition, it is safe for the human body and easy to handle, and does not fall under the category of ozone depleting substances. Further, since a compound containing no hydroxyl group in the molecule is used, there is very little possibility that curing inhibition will be caused even if this compound is mixed into a resin component during cleaning in a resin discharge device or the like.

Further, since the detergent comprising only the component (a) of the present invention can be recovered only by distillation at a predetermined temperature, the recovery rate is good, and the cost and cost for the distillation treatment are remarkable. This is advantageous in that no equipment is required. The recovered cleaning agent can be expected to have the same cleaning effect as the original cleaning agent, so that it can be used repeatedly, thus reducing the amount of industrial waste causing environmental pollution.

Further, since the cleaning agent of the present invention does not adversely affect the curing of the resin even when mixed into the two-component cured resin component, no special consideration is required for mixing the cleaning agent.

In addition, according to the method for cleaning a resin discharge device of the present invention, since the above-mentioned cleaning agent is used, the uncured two-liquid curing type adhered to the mixing portion and the nozzle portion of the resin discharge device. The resin component can be efficiently washed.

Claims (3)

[Claims] 1. A cleaning agent for a two-component curable resin component in an uncured state, wherein the cleaning agent has the following general formula (1): [Wherein, R ¹ and R ³ are each independently an alkyl group having 1 to 3 carbon atoms, R ² is a hydrogen atom or a methyl group, and n is 2 to 3
Which represents an integer of the formula (a). 2. A compound of the component (a) according to claim 1 and a compound represented by the following general formula (2): Wherein R ¹ is an alkyl group having 2 to 4 carbon atoms, R ² is a hydrogen atom or a methyl group, and n is an integer of 2 to 3). A) a cleaning agent, wherein the content of the component is 50% by weight or more and less than 100% by weight, and the content of the component (b) is more than 0% by weight and 50% by weight or less. 3. A method for cleaning an uncured two-liquid curable resin component adhered to a mixing portion and a nozzle portion of a two-liquid curable resin discharge device, the method comprising:
Or a cleaning method for cleaning a mixing section, a nozzle section, and the like of the resin discharge device using the cleaning agent according to 2.