JPH08224740A - Washing agent for glass mold - Google Patents

Abstract

PURPOSE: To obtain a washing agent not applicable to an ozone layer destructing substance and having excellent washing capacity by preparing the washing agent for washing the polymer, oligomer or monomer bonded to a glass mold from one or more kind of glycol diether represented by a specific formula. CONSTITUTION: A washing agent for a glass mold is prepared from one or more kind of glycol diether represented by formula (wherein R<1> and R<2> are respectively independently a 1-2C alkyl group, R<3> is a hydrogen atom or a methyl group and m is an integer of 1-3). This washing agent can be prepared from one or more kind of glycol diether and ethylenic or propylene type glycol monoether and at this time, 30wt.% of glycol diether is pref. compounded and water is set to below 30wt.% and the residual part is ethylenic or propylene type glycol monoether.

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 glass molds, and more particularly to a cleaning agent for cleaning polymers, oligomers and monomers attached to glass molds.

[0002]

2. Description of the Related Art Halogenated hydrocarbon solvents such as CFC-113 and trichloroethane are widely used as conventional glass mold cleaning agents, and alcohols and ketones are widely used. Alternatively, hydrocarbon solvents have also been used.

However, in the above solvent,
As a substance causing the ozone layer to be destroyed, it is necessary to severely reduce its use, and most of them will not be usable in the future.

Although the above substances are not ozone-depleting substances, their cleaning power against pollutants of the polymers, oligomers, and monomers is much worse, and alcohols and ketones are safe due to their low flash points. We had to make a large capital investment in gender.

It should be noted that many alkaline detergents widely used as detergents or semi-aqueous detergents containing ethylene or propylene glycol monoether as a main component do not show practically good detergency at all. There was a problem.

[0006]

The present invention has been made by paying attention to such conventional problems. That is, the cleaning agent for glass molds according to claim 1 is composed of at least one glycol diether represented by the following general formula.

[0007]

[Chemical 4] (In the formula, R ¹ and R ² each independently have 1 or 2 carbon atoms.
Alkyl group, ^{R 3} is a hydrogen atom or a methyl group, m is an integer of 1 to 3).

The cleaning agent for glass molds according to claim 2 is composed of at least one glycol diether according to claim 1 and an ethylene or propylene glycol monoether.

According to a third aspect of the present invention, in the glass mold detergent of the second aspect, the glycol diether is added in an amount of 30% by weight (hereinafter simply referred to as "%") and water is added in an amount of 30%. It is characterized in that it is blended in a ratio of less than, and the balance is ethylene-based or propylene-based glycol monoether.

The cleaning agent for glass molds according to claim 4 is the cleaning agent according to claim 2 or 3, wherein at least one of the glycol diethers is diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether or polyethylene glycol. Dimethyl ether, wherein the ethylene glycol monoether is represented by the following general formula (2), and the propylene glycol monoether is a water-soluble glycol monoether represented by the following general formula (3). To do.

[0011]

Embedded image (In the formula, R ⁴ is an alkyl group having 1 to ⁴ carbon atoms)

[Chemical 6] (In the formula, R ⁵ is an alkyl group having 1 to 2 carbon atoms)

[Requirements Constituting Means] The glycol diether used in the present invention is a compound composed of an ethylene oxide or propylene oxide 1 to 3 mol adduct of an aliphatic alcohol having 1 or 2 carbon atoms, and the terminal hydrogen is methyl. Group substituted with a group or ethyl group,
For example, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether,
Examples thereof include diethylene glycol ethyl methyl ether, dipropylene glycol dimethyl ether, tripropylene glycol dimethyl ether, propylene glycol diethyl ether, dipropylene glycol diethyl ether, tripropylene glycol diethyl ether, dipropylene glycol ethyl methyl ether. Among them, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether, and polyethylene glycol dimethyl ether are preferable because they have excellent water rinsing properties because they are completely water-soluble.

The blending ratio of each component of the detergent of the present invention is preferably 30% or more, more preferably 40% or more, and more preferably 100% or more of glycol diether.
The closer to, the higher the cleaning power tends to be. If it is less than 30%, the detergency tends to be poor.

The mixing ratio of water is preferably less than 30%. If it is 30% or more, the detergency tends to be poor.
The amount of water blended is determined by the cleaning performance that depends on the type and molecular weight of the contaminants that adhere to the glass mold, and the handling safety. Further, it is preferable to use pure water, ion-exchanged water, or distilled water.

Other components constituting the detergent include various surfactants, paraffin hydrocarbons, terpene hydrocarbons, and further ethylene or propylene glycol monoethers from alcohols and ketones, N-methyl-2-pyrrolidone and the like are preferable. Among them, ethylene-based or propylene-based glycol monoethers are preferable in terms of excellent water solubility.

Furthermore, among these ethylene-based or propylene-based glycol monoethers, the ones represented by the above-mentioned general formulas (2) and (3) are completely water-soluble, and thus are excellent in water rinsing property. Is preferred.

Specific examples of these glycol monoethers include diethylene glycol monomethyl ether,
Examples thereof include diethylene glycol monoethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol mononormal propyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mononormal butyl ether, dipropylene glycol monomethyl ether and dipropylene glycol monoethyl ether.

It is also effective in some cases to add a nonionic surfactant to improve the rinsability of the cleaning agent.
In the case of efficiently removing contaminants such as oils and fats such as fingerprints and fine particles, the combined use of a fluorine-based surfactant, tetraalkylammonium hydroxide and the like is also effective.

The cleaning material targeted by the present invention is a glass mold, and is mainly a glass mold used at the time of molding an optical plastic lens.

The pollutants to which the present invention is applied are mainly polymer residues of optical plastic lenses and unreacted monomers, and the materials for the plastic lenses are methacrylic resin, polycarbonate, polystyrene and CR39 (commercial products of PPG Co., USA) The chemical name of the monomer is diethylene glycol bisallyl carbonate.), Polymethylpentene, etc. are exemplified.

In use, the cleaning agent of the present invention is immersed in a stock solution or washed with an ultrasonic cleaning apparatus, and then rinsed with water which is a rinsing step, and then dried.

In some cases, non-rinse washing can be performed by drying only by washing and eliminating the rinsing operation.

[0023]

EXAMPLES Examples 1 to 17 and Comparative Examples 1 to 7 Cleaning agents of the following [Table 1], [Table 2], and [Table 3] were prepared, and each of the effect examples 1 to 3 was evaluated.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

Effect Example 1 (Glass resin for molding methacrylic resin
Ultrasonic cleaning of the resin ) The glass mold to which the methacrylic resin residue and unreacted methyl methacrylate monomer are attached is kept at room temperature of 20 ° C. for 6 minutes.
Ultrasonic cleaning of 40 KHz and 600 W was performed for 0 seconds. Next, post-rinse treatment was performed, and after drying, the finishability of the surface of the component was visually evaluated. The results are shown in [Table 4] below.

Effect Example 2 (CR39 molding glass mold)
Ultrasonic Cleaning Property of) The glass mold having the CR39 resin residue and the unreacted diethylene glycol bisallyl carbonate monomer adhered thereto was ultrasonically cleaned at 40 ° C. for 60 seconds at 40 KHz and 600 W. Next, post-rinse treatment was performed, and after drying, the finishability of the surface of the component was visually evaluated. The results are shown in [Table 4].

Effect Example 3 (Glass resin for methacrylic resin molding
Ultrasonic non-rinse cleaning of resin ) Unreacted methyl methacrylate monomer of methacrylic resin,
The glass mold on which the polymer fine particles and fingerprints were attached was subjected to ultrasonic cleaning at room temperature of 20 ° C. for 30 seconds at 40 KHz and 600 W. Next, after sufficient blow treatment, it was dipped in the same new cleaning solution for 30 seconds, blown again, dried at 120 ° C. for 10 minutes, and the finish of the surface of the component was visually evaluated. The results are shown in [Table 4].

[0030]

[Table 4]

[0031]

Industrial Applicability The cleaning agent of the present invention is excellent in the cleaning property of the polymer residue of the optical plastic lens resin adhered to the glass mold and the unreacted monomer, and has an ozone layer like CFC-113 or 1,1,1-trichloroethane. It is not a destructive substance, has superior cleaning properties compared to alcohol or hydrocarbon solvents or alkaline cleaners and conventional semi-aqueous cleaners, and is easy to handle.

Claims (4)

[Claims] 1. A cleaning agent for a glass mold, comprising at least one glycol diether represented by the following general formula. Embedded image (In the formula, R ¹ and R ² each independently have 1 or 2 carbon atoms.
Alkyl group, ^{R 3} is a hydrogen atom or a methyl group, m is an integer of 1-3. ) 2. A glycol diether according to claim 1
A glass mold cleaning agent comprising at least one kind and an ethylene-based or propylene-based glycol monoether. 3. The glycol diether is blended in an amount of 30% by weight or more, water is blended in a proportion of less than 30% by weight, and the balance is the ethylene-based or propylene-based glycol monoether. The cleaning agent according to claim 2. 4. At least one of the glycol diethers.
The seed is diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether or polyethylene glycol dimethyl ether, the ethylene glycol monoether is represented by the following general formula (2), and the propylene glycol monoether is the following general formula. The cleaning agent according to claim 2 or 3, which is a water-soluble glycol monoether represented by (3). Embedded image (In the formula, R ⁴ is an alkyl group having 1 to ⁴ carbon atoms) (In the formula, R ⁵ is an alkyl group having 1 to 2 carbon atoms)