JPH09323329A - Cleaning agent for plastic lens molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly clean a molding die for plastic lend using only a cleaning agent even when a material for lens is attached to the die by mixing methylene chloride being major component, formic acid, phenol, and surface-active agent. SOLUTION: A glass mold, which is used to mold plastic and to which plastic is attached, is put into a cleaning cage, which cage is out into an ultrasonic cleaning machine. The cleaning agent in the machine is mainly composed of methylene chloride. And forming acid, phenol, and surface-active agent are added to the methylene chloride. And forming acid of about 2wt.% phenol of about 2wt.%, dodecylbenzene sodium sulfonate of about 1wt.% and water of about 2wt.% respectively at inner percentage are added to the methylene chloride. Thus even if material for lens, which cannot be removed by means of cleaning agent, can be completely removed. Preliminary cleaning or wiping work after cleaning can be eliminated and hence a cleaning process can be simplified.

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 form, and is particularly suitable for cleaning a glass mold used in manufacturing a plastic lens by a cast polymerization method. The present invention relates to a cleansing agent for a plastic lens molding form.

[0002]

2. Description of the Related Art Conventionally, a plastic lens has been widely used as a lens for eyesight-correcting eyeglasses because it has characteristics such as being lighter in weight and less likely to be damaged than glass. .

This plastic lens is generally manufactured by a casting polymerization method in which a lens material such as a monomer is injected into a molding frame such as a glass mold and polymerization is performed in the frame. And the glass mold used here is
Since it is used to manufacture precision parts called lenses, high surface precision is required, and since it itself is precise and expensive, it is repeatedly used. Is required to be completely removed.

Therefore, since a diglycol bisallyl carbonate resin is generally used as the main material of the lens material, a cleaning agent for cleaning the glass mold after use is disclosed in JP-A-58-119828. As proposed in the gazette and the like, a methylene chloride-based detergent is mainly used.

On the other hand, in recent years, plastic lenses have been further reduced in weight and thickness, and along with this, improvements have been made in lens materials and the plastic materials themselves have changed.

However, even if the lens is manufactured using these materials and then cleaned with a conventional cleaning agent, the material remains attached to the glass mold, and it is difficult to perform sufficient cleaning. Therefore, the cleaning process tends to be complicated, for example, manual work such as preliminary cleaning and wiping is required.

The present invention has been made in view of the above circumstances,
Even if a material such as a polymer, which has been improved with the conventional cleaning agents used in lighter and thinner plastic lenses, is difficult to remove, even if it adheres to the molding frame of plastic lenses such as glass molds, only the cleaning agent It is an object of the present invention to provide a cleaning agent for a plastic lens molding form that can be satisfactorily washed with.

[0008]

Means for Solving the Problems and Modes for Carrying Out the Invention As a result of intensive studies aimed at achieving the above-mentioned objects, the present inventors first found that as a cleaning agent for cleaning a glass mold,
Chlorine-based solvents are considered to be suitable due to their strong dissolving power, and cleaning tests were conducted using various chlorine-based solvents, and it was concluded that methylene chloride is the most suitable in terms of detergency and safety. Obtained. However, even if methylene chloride is used, the above-mentioned JP-A-58 is used.
It was concluded that the methylene chloride-based cleaning agent exemplified in JP-A-1119828 is not sufficient to completely clean the materials used in recent years, and further studies are made on effective additives and combinations thereof. It was

As a result, when a detergent obtained by mixing methylene chloride as a main component with formic acid, phenols and a surfactant as an additive is used, surprisingly, the detergency is higher than that of a conventional detergent. The present invention is far superior to that of the prior art, and it has been found that the conventional pre-cleaning and wiping by hand are not required and the treatment after cleaning can be simplified, and the present invention has been completed.

Therefore, there is provided a detergent for a plastic lens molding frame, which comprises methylene chloride as a main component and formic acid, phenols and a surfactant.

The present invention will be described in more detail below. The cleaning agent for a plastic lens molding form of the present invention comprises:
A lens material adhered to a glass mold, which is used as a mold for a plastic lens such as a lens for correcting visual acuity due to recent weight reduction and thinning, after the glass mold is used. In addition to satisfactorily washing and removing, the treatment after washing is simple and can be suitably used when an expensive glass mold is repeatedly used.

Here, each component of the detergent of the present invention will be described. First, the detergent of the present invention contains methylene chloride as a main component.

Further, the cleaning agent of the present invention is one in which three components of formic acid, phenols and a surfactant are added to methylene chloride. If any one of these components is lacking, the cleaning effect becomes insufficient, The object of the present invention is not achieved.

Here, the concentration of formic acid is 0.
From the viewpoint of detergency, 1% by weight or more is preferable. On the other hand, if the concentration is too high, not only the detergency is not improved, but also the cost is increased, so 10% by weight or less is preferable for practical use. More preferably, it is 1 to 5% by weight.

Next, examples of the phenols include phenol, cresol, xylenol, naphthol, hydroquinone and the like. These can be used alone or in combination of two or more. Considering cost and detergency, phenol is preferable. From the viewpoint of detergency, the concentration of phenols is preferably 0.1% by weight or more of the total detergent. Further, when it exceeds 5% by weight,
Since the cleaning power cannot be sufficiently increased, the cost may be too high, and the work during the rinse after cleaning may be burdened, the content is preferably 5% by weight or less. It is more preferably 1 to 3% by weight.

As the surface active agent, for example, an anionic surface active agent, a nonionic surface active agent, a cationic surface active agent or the like can be used. Even if these surface active agents are used alone, they are nonionic. It is also possible to use a surfactant in combination with an anionic surfactant or a cationic surfactant.

In this case, various surfactants are exemplified as follows.
First, examples of the anionic surfactant include higher fatty acid salts, alkylbenzene sulfonates, alkyl sulfonates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl phenyl ether sulfates, dialkyl sulfosuccinates, and nonionic surfactants. Examples of surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, fatty acid monoglyceride, polyoxyethylene fatty acid ester, and the like. Examples include chain alkyl trimethyl ammonium chloride, di long chain alkyl dimethyl ammonium chloride, alkyl ammonium chloride, benzalkonium chloride, etc.

From the viewpoint of detergency, the concentration of the surfactant is preferably 0.01% by weight or more, more preferably 0.05% by weight or more, based on the whole detergent. On the other hand, if the amount exceeds 10% by weight, it is not possible to sufficiently increase the detergency, and it may be too costly or the work during the rinsing after cleaning may be burdened. More preferably, it is 0.05 to 2% by weight.

Depending on the combination of the kind and the addition amount of the surfactant, the surfactant may not be completely dissolved in methylene chloride as the main component. In this case, a small amount of a good solvent for the surfactant may be added. Good. As this good solvent,
It is sufficient to use one that does not impair the properties of the entire detergent by adding it, and for example, water can be used.

When a solvent is added for the purpose of dissolving the surfactant, the solvent and methylene chloride may not be compatible with each other and may be separated into two liquids. In this case, methylene chloride is used. In the case where the above components are contained within the above concentration range, the detergency is not lowered, and the effect of the present invention is sufficiently achieved.

In order to use the cleaning agent for a plastic lens molding form of the present invention, a conventionally known method can be adopted,
For example, it is possible to follow an ordinary method of immersing a used glass mold in a cleaning agent, performing ultrasonic cleaning, rinsing and removing additives in the cleaning agent adhering to the mold, and then drying. it can.

Incidentally, other treatment may be carried out as needed during or before or after the washing step as long as the effect of the detergent according to the present invention is not impaired.
As the washing machine, the washing machine which has been conventionally used can be used as it is as long as it has resistance to formic acid, phenols, surfactants and the like.

[0023]

According to the cleaning agent for a plastic lens molding form of the present invention, even if the lens material, which cannot be removed by the conventional cleaning agent, adheres to the form, it can be completely removed. Therefore, the pre-cleaning and the wiping work after cleaning, which have been conventionally performed, are unnecessary, and the cleaning process is simplified.

[0024]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Example 1] A glass mold used for molding a plastic lens, to which plastic is adhered, was placed in a washing basket, which was placed in a seven-tank ultrasonic cleaner, and each was placed in a liquid tank shown below. It was washed for 1 minute. First tank to third tank (cleaning) 2% by weight of formic acid, 2% by weight of phenol, 1% by weight of sodium dodecylbenzene sulfonate with respect to methylene chloride,
Detergent with 2% by weight of water added internally ( 4th tank (rinse) Drinking water 5th tank (rinse) Pure water 6th tank (dehydration) 2-Propanol 7th tank (steam cleaning) Methylene chloride After that, the plastic state of the washed glass mold was visually observed and evaluated. Table 1 shows the results
Shown in

Example 2 As a cleaning agent in the first to third tanks, formic acid 2% by weight, phenol 2% by weight, dodecyltrimethylammonium chloride 1% by weight, and water 2% by weight were contained in methylene chloride. Cleaning was performed and evaluation was performed in the same manner as in Example 1 except that the cleaning agent added by splitting was used. The results are shown in Table 1.

[Example 3] As a cleaning agent in the first tank to the third tank, formic acid 2% by weight, phenol 2% by weight, polyoxyethylene nonylphenyl ether 0.5% by weight, dodecylbenzene, relative to methylene chloride. Cleaning was carried out in the same manner as in Example 1 except that a cleaning agent obtained by adding 0.5% by weight of sodium sulfonate and 2% by weight of water in an internal ratio was used.
An evaluation was made. The results are shown in Table 1.

[Example 4] As a cleaning agent in the first tank to the third tank, formic acid 2% by weight, phenol 2% by weight, polyoxyethylene nonylphenyl ether 0.5% by weight, dodecylmethyl, relative to methylene chloride. Washing was performed in the same manner as in Example 1 except that a cleaning agent obtained by adding 0.5% by weight of ammonium chloride and 2% by weight of water in an internal ratio was used.
An evaluation was made. The results are shown in Table 1.

[Comparative Example 1] Cleaning was carried out and evaluated in the same manner as in Example 1 except that methylene chloride was used alone as the cleaning agent in the first tank to the third tank. The results are shown in Table 1.

[Comparative Example 2] As a cleaning agent in the first tank to the third tank, a cleaning agent obtained by adding formic acid 2% by weight and phenol 2% by weight to methylene chloride was used. It was washed and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 3] As a cleaning agent in the first tank to the third tank, formic acid 2% by weight, dodecyltrimethylammonium chloride 1% by weight, and water 2% by weight with respect to methylene chloride.
Cleaning was carried out and evaluated in the same manner as in Example 1 except that a cleaning agent obtained by adding the above was used. Table 1 shows the results
Shown in

[Comparative Example 4] As a cleaning agent in the first to third tanks, 2% by weight of phenol, 1% by weight of sodium dodecylbenzenesulfonate and 2% by weight of water were added in proportion to methylene chloride. Cleaning was performed and evaluation was performed in the same manner as in Example 1 except that the cleaning agent obtained as described above was used. The results are shown in Table 1.

The materials used in the above examples and comparative examples are as follows. Methylene chloride: Shin-Etsu Chemical Co., Ltd., methylene chloride A-10 Formic acid: primary reagent Phenol: primary reagent Sodium dodecylbenzenesulfonate: NOF Corporation, Nurex R dodecyltrimethylammonium chloride: NOF Corporation Cation BB polyoxyethylene nonyl phenyl ether: manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Neugen EA-120

[0034]

[Table 1]

From the results shown in Table 1, it was confirmed that an excellent cleaning effect was achieved by adding formic acid, phenols and a surfactant to methylene chloride (Example). On the other hand, if any one of formic acid, phenols and surfactants was not added (comparative example), the detergency was lowered and the plastic remained.

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Claims (1)

[Claims] 1. A cleaning agent for a plastic lens molding form, which comprises methylene chloride as a main component, and is mixed with formic acid, phenols and a surfactant.