JPH11199895A - Cleaning agent for molding frame for plastic lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cleaning agent excellent in detergency by formulating a mixture liquid containing amino-alcohols or the like, added to dimethyl sulfoxide with an aqueous solution of tetramethylammonium hydroxide. SOLUTION: This cleaning agent is obtained by including (C) an aqueous solution of tetramethylammonium hydroxide in a mixture prepared by adding (B) one or two kinds of compounds selected from amino-alcohols (e.g. N- methylethanolamine), ethanolamines (e.g. monoethanolamine) and N- methylpyrrolidone to (A) dimethyl sulfoxide as a main agent. In the cleaning agent, 35-80 wt.% ingredient A, 60-15 wt.% ingredient B and 0.01-5.0 wt.% ingredient C are preferably contained.

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 a plastic lens molding mold, and more particularly to a glass mold used for producing a plastic lens by a casting polymerization method. The present invention relates to a suitable plastic lens mold cleaning agent.

[0002]

2. Description of the Related Art Conventionally, plastic lenses have been widely used as glasses for eyesight correction because they are lighter in weight than glass lenses and have characteristics of being hardly damaged.

[0003] This plastic lens is generally manufactured by a casting polymerization method in which a lens material such as a monomer is injected into a mold (glass mold) and polymerized in the mold. Since the glass mold used here is used for manufacturing precision parts called lenses, high surface accuracy is required, and the glass mold itself is precise. In addition, since it is expensive, it is used repeatedly, so that it is required to completely remove the lens material attached to the glass mold after use.

In view of the above, since a diglycol bisallyl carbonate resin is generally used as a main component of a lens material, JP-A-58-119828 discloses a cleaning agent for cleaning a used glass mold. And the like, cleaning agents based on methylene chloride are mainly used. On the other hand, in recent years, the weight and thickness of plastic lenses have been further reduced, and accordingly, improvements have been made to lens materials, and the plastic materials themselves have also changed.

[0005] However, even after the lens is manufactured from these materials, even if the lens is cleaned with a conventional cleaning agent, the material remains attached to the glass mold, and it is difficult to sufficiently clean the lens. Therefore, the cleaning process tends to be complicated, for example, a manual operation such as preliminary cleaning and wiping is required.

On the other hand, in order to completely remove dirt adhering to the glass mold, the cleaning agent needs to have a dissolving power, a penetrating power, and a power for swelling and removing the dirt. To that end, it is effective to raise the liquid temperature to some extent. With the conventional methylene chloride-based cleaning agent, since the boiling point of methylene chloride itself is 40 ° C., it is impossible to raise the liquid temperature of the cleaning agent to 40 ° C. or higher. .

[0007] The present invention has been made in view of the above circumstances. That is, the present invention relates to a polymer made of a material improved with a reduction in the weight and thickness of a plastic lens,
The purpose is to provide a cleaning agent for plastic lens molding molds that can be effectively cleaned when it adheres to plastic lens molding molds (hereinafter referred to as "glass molds"), which cannot be removed with conventional methylene chloride-based cleaning agents. And Another object of the present invention is to provide a cleaning agent which can be used by raising the liquid temperature of the cleaning agent, and which can improve the dissolving power, the penetrating power, and the swelling / peeling power, thereby enhancing the cleaning effect. .

[0008]

SUMMARY OF THE INVENTION The present inventors have conducted intensive studies to achieve the above object, and as a result, as a cleaning agent for cleaning a glass mold, the above-mentioned JP-A-58-11 was used.
It has been concluded that the methylene chloride cleaning agent exemplified in Japanese Patent No. 9828 cannot completely clean a glass mold to which a polymer of a material used in recent years has adhered. Further investigation was performed.

As a result, a solution obtained by adding one or two kinds of compounds selected from the group consisting of amino alcohols, ethanolamines, and N-methylpyrrolidone to dimethyl sulfoxide is added to an aqueous solution of tetramethylammonium hydroxide (TMAH). The use of a cleaning agent obtained by blending with, the cleaning power is much better than conventional cleaning agents, eliminating the need for conventional pre-cleaning and manual wiping, and simplifying the processing after cleaning. I found The present invention has been completed from such a viewpoint.

[0010]

That is, the present invention comprises dimethyl sulfoxide as a main ingredient, amino alcohols,
A mixture of one or two compounds selected from the group consisting of ethanolamines and N-methylpyrrolidone is added to tetramethylammonium hydroxide (T
MAH) Provided is a cleaning agent for a plastic lens molding form, which is mixed with an aqueous solution. In addition, the present invention relates to 35 to 80% by weight of dimethyl sulfoxide, 60 to 15% by weight of one or two kinds of compounds selected from the group consisting of amino alcohols, ethanolamines and N-methylpyrrolidone;
Further, the present invention provides a plastic lens molding mold cleaning agent comprising an aqueous solution of tetramethylammonium hydroxide in an amount of 0.05 to 5.0% by weight. Hereinafter, the present invention,
This will be described in detail.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The plastic lens mold cleaning agent of the present invention uses a glass mold which is used as a mold for plastic lenses such as a lens for correcting vision with the recent reduction in weight and thickness. This will be used later for cleaning. The lens material adhered to the glass mold can be washed and removed well, the treatment after the washing is simple, and it can be suitably used when an expensive glass mold is repeatedly used.

Each component of the cleaning agent of the present invention will be described. First, the cleaning agent of the present invention contains dimethyl sulfoxide (hereinafter, referred to as “DMSO”) as a main component. DMSO is preferably 35 to 80% by weight, more preferably 55 to 75% by weight, and particularly preferably. 60 or 70% by weight of 1 or 2 selected from the group consisting of amino alcohols, ethanolamines and N-methylpyrrolidone.
Tetramethylammonium hydroxide (hereinafter referred to as “TMAH”)
It is a detergent containing an aqueous solution.

The amino alcohols include, for example, N-methylethanolamine, N-methyl-N, N-diethanolamine, N, N-diethylethanolamine, N, N-dimethylethanolamine,
Examples include aminoethylethanolamine or N, N-dibutylethanolamine. Specific examples of ethanolamines include monoethanolamine, diethanolamine, and triethanolamine.

In the cleaning agent of the present invention, one or two compounds selected from the group consisting of amino alcohols, ethanolamines and N-methylpyrrolidone as described above are used in a mixture with DMSO. The mixing ratio is
It is preferably 60 to 15% by weight based on 35 to 80% by weight of DMSO in the detergent.

The purpose of adding amino alcohols, ethanolamines and the like to DMSO is to increase the detergency.
Further, since the melting point of DMSO itself is relatively high at 18.7 ° C., the melting point of the detergent is reduced by using a mixture to prevent freezing of the detergent even when the temperature falls during winter. The mixing amount of amino alcohols, ethanolamines and the like is preferably 60 to 15% by weight in the detergent.
More preferably 50 to 25% by weight, particularly preferably 40 to 25% by weight.
３０30% by weight. Even if it is added in excess of 60% by weight, a sufficient washing effect cannot be obtained, and if it is less than 15% by weight, the effect of preventing freezing of the detergent cannot be expected, which is not preferable.

Next, an aqueous solution of TMAH is mixed with a mixture of DMSO and amino alcohols, ethanolamines, etc. to obtain a cleaning agent for a plastic lens mold. The TMAH aqueous solution is an organic strong alkaline aqueous solution. The purpose of adding and blending TMAH is to obtain a cleaning effect of swelling and peeling off dirt substances adhered to the glass mold.

The effect of swelling and peeling removal can be obtained to some extent even with a KOH or NaOH aqueous solution as another alkaline aqueous solution. However, KOH is added to a mixed solution of DMSO and amino alcohols, ethanolamines and the like.
Alternatively, when an aqueous solution of NaOH is added, precipitates and precipitates are generated, which may cause inconveniences such as blockage in the cleaning system. In this regard, in the case of TMAH used in the present invention, no precipitate or precipitate is generated, a transparent liquid is obtained, and the washing effect is improved.

Therefore, as the alkaline aqueous solution, TM
AH aqueous solution is excellent, and the compounding amount is from
It is preferably 5.0% by weight, more preferably 0.1 to 2.0% by weight, and particularly preferably 0.2 to 1.0% by weight. If the amount is less than 0.01% by weight, no cleaning effect can be expected, while 5.0% by weight
If it exceeds, the cleaning power cannot be sufficiently increased,
It is not preferable because the cost may be too high or a bad effect of eroding the glass mold may occur. Where TM
As the AH aqueous solution, the conversion is based on the case where an aqueous solution containing 15% by weight of TMAH is used. However, the concentration of the aqueous solution is not limited at all, and any aqueous solution containing the same amount of TMAH can be used. . However, an aqueous solution containing 10 to 20% by weight of TMAH is preferable from the viewpoint of the preparation and the like.

The use of the plastic lens mold cleaning agent of the present invention containing the above-mentioned components makes it possible to completely remove dirt such as material polymers which could not be removed by the conventional methylene chloride-based cleaning agent. In addition, the pre-cleaning and the wiping work after the cleaning, which have been conventionally performed, become unnecessary, and the simplification of the cleaning process is achieved.

The components of the detergent of the present invention, such as DMSO, amino alcohols and ethanolamines, all have a boiling point of 135 ° C. or higher. Therefore, it becomes possible to raise the temperature of the liquid of the cleaning agent before use. By improving the dissolving power, penetrating power, and swelling peeling power,
The cleaning effect can be enhanced.

The temperature of the used solution of the cleaning agent of the present invention is 40 to 8
The range of 0 degreeC is preferable, the range of 50-70 degreeC is more preferable, and the range of 55-65 degreeC is especially preferable. The cleaning agent of the present invention is used for molding and manufacturing of plastic lenses, and a glass mold to which dirt such as a material polymer is adhered is immersed in the cleaning agent solution, and is subjected to ultrasonic irradiation cleaning to achieve a superfluous temperature effect. The sound wave oscillation effect is added, and the cleaning effect can be further enhanced. Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0022]

EXAMPLES Examples 1 to 8 and Comparative Examples 1 to 5 The glass molds used for cleaning were those used in the production of plastic lens moldings, to which plastic materials such as polymers were adhered. The attached plastic material is trade name “MR-7” manufactured by Mitsui Toatsu Co., Ltd. Table 1 shows the composition of the prepared detergent.

Washing was performed under the following conditions and procedures, and the surface state of the glass mold after washing was evaluated by visual observation. The temperature of the liquid in the 1 liter beaker containing the cleaning agent was 58
Set to ~ 63 ° C. A glass mold for a sample was set in a jig in this liquid, and cleaning by ultrasonic irradiation was performed for 5 minutes. Here, the oscillation frequency of the ultrasonic oscillator is 42 kHz.
z, the maximum output is 300W. After the above washing, rinse with running pure water for 3 minutes, replace with water for 3 minutes with dehydration washing with ethanol, and wash with steam for 1 minute with methylene chloride. This steam cleaning was performed for the purpose of drying by removing ethanol and minute water adhering to the surface of the glass mold. After the surface of the glass mold was dried, the cleaning effect was evaluated by visual observation under a fluorescent lamp.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

As described above, the use of the plastic lens mold cleaning agent of the present invention makes it possible to completely remove dirt such as material polymers which could not be removed with the conventional methylene chloride-based cleaning agent. In addition, the pre-cleaning and the wiping work after the cleaning, which have been conventionally performed, become unnecessary, and the cleaning process can be simplified. Further, according to the cleaning agent of the present invention, it is possible to raise the liquid temperature of the cleaning agent and use it,
By improving the dissolving power, the penetrating power, and the swelling / peeling power, the cleaning effect can be enhanced. Further, by performing the ultrasonic irradiation cleaning using the cleaning agent of the present invention, the ultrasonic oscillation effect is added to the liquid temperature effect, and the cleaning effect can be further enhanced. Is very significant.

Claims (3)

[Claims] 1. A mixture of dimethyl sulfoxide and one or two compounds selected from the group consisting of aminoalcohols, ethanolamines and N-methylpyrrolidone, mixed with an aqueous solution of tetramethylammonium hydroxide. Cleaner for plastic lens molds. 2. Dimethyl sulfoxide 35-80% by weight, amino alcohols, ethanolamines and N-
60 to 15% by weight of one or two kinds of compounds selected from the group consisting of methylpyrrolidone, and 0.05 to 5.0% by weight of an aqueous solution of tetramethylammonium hydroxide
Cleaning agent for plastic lens molds consisting of: 3. The amino alcohols are N-methylethanolamine, N-methyl-N, N-diethanolamine, N, N-diethylethanolamine, N, N-
2. The plastic lens mold according to claim 1, wherein the ethanolamine is dimethylethanolamine, aminoethylethanolamine or N, N-dibutylethanolamine, and the ethanolamine is monoethanolamine, diethanolamine or triethanolamine. Cleaning agent for frames.