JPH09241685A - Industrial cleaner for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cleaner satisfying requisite performances such as for environmental protection, odor and ignitability, and excellent in cleanup power against adhesives and protective films as well as petroleum-based pitch, comprising a hydrocarbon-based solvent and a specific compound. SOLUTION: This industrial cleaner for lens comprises (A) pref. 50-80wt.% of a 6-30C hydrocarbon-based solvent with a flash point of pref. >=70 deg.C (e.g. dodecylbenzene, hexadecane) and (B) 20-50wt.% of a compound of the formula R<1> COO-(AO)n -R<2> (R<1> is a 1-2C alkyl; R<2> is a 1-8C alkyl; A is a 2-3C alkylene; (n) is 1-5) (e.g. diethylene glycol monomethyl ether, dipropylene glycol monobutyl ether acetate), and pref. furthermore, 3-20wt.% of a nonionic surfactant (pref. of polyethylene glycol ether type with a HLB number of 10-15).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial cleaning agent for lens cleaning, and more particularly to an industrial cleaning agent useful for removing petroleum pitch, adhesive, protective film, etc. adhering to lenses. Regarding

[0002]

2. Description of the Related Art Generally, the polishing process in the processing of lenses is carried out with the lenses stuck to a petroleum pitch and fixed. If this is done, the performance of the lenses in the final product will be adversely affected, so it is necessary to quickly remove the petroleum-based pitch after the polishing step.
If petroleum-based pitch or polishing powder remains,
It is necessary to completely remove petroleum pitch and the like because the precision of the lenses deteriorates.

In recent years, lenses have been used in the polishing process.
In order to avoid direct contact with the petroleum-based pitch, the fixing surface of the lenses is first protected by an adhesive, and then the lenses are attached and fixed to the petroleum-based pitch. Further, a protective film may be applied to the polishing surface for the purpose of protecting the polishing surface after the polishing step. Therefore, in such a case, in addition to the petroleum-based pitch, after the polishing step,
It is also necessary to completely remove the adhesive and the protective film.

Conventionally, a chlorine-containing hydrocarbon solvent has been used as an industrial cleaning agent for removing petroleum-based pitch adhering to such lenses. However, although the chlorine-containing hydrocarbon solvent has the advantage that it is nonflammable and has excellent drying property, it cannot be used because of environmental pollution such as ozone depletion. Under such circumstances, an industrial cleaning agent for cleaning petroleum pitch, such as that found in Japanese Patent Application Laid-Open No. 7-150192, has been proposed.

[0005]

However, although the cleaning agent described in the above publication has a certain level of cleaning power for petroleum pitch, it lacks cleaning power for adhesives and protective films, so that it has been used in recent years. It is difficult to use as an industrial cleaning agent for lenses protected with a chemical or protective film.

Therefore, in the present invention, industrial cleaning for lens cleaning which can satisfy the required performances such as environmental characteristics, odor and flammability and is excellent in cleaning power for adhesives and protective films in addition to petroleum pitch. The purpose is to provide an agent.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that (a) a hydrocarbon solvent having 6 to 30 carbon atoms as an industrial cleaning agent for lens cleaning, And (b) general formula (1): R ¹ COO- (AO)
_n -R ² (R ¹ is an alkyl group having 1 to 2 carbon atoms, R ² is an alkyl group having 1 to 8 carbon atoms, A is an alkylene group having 2 to 3 carbon atoms, n is an integer of 1-5. The inventors have found that the above problems can be solved by using a composition containing a compound represented by the formula (4) as a main component, and have completed the present invention.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION (a) The hydrocarbon solvent having 6 to 30 carbon atoms has 6 to 30 carbon atoms, preferably 6 to 30 carbon atoms.
There is no particular limitation as long as it has 20, and various aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons or those in which these hydrocarbons are bonded can be used. The various hydrocarbons may be linear or branched and may have unsaturated bonds. The flash point of these compounds is preferably 70 ° C. or higher.

Specific examples of the hydrocarbon solvent having 6 to 30 carbon atoms include dodecylbenzene, diisopropylbenzene, tetraamylbenzene, dodecane,
Hexadecane, tetradecane, tetradecene, decalin, dimethyldecalin, diisopropylcyclohexane, butylcyclohexane, dodecylcyclohexane,
Examples include petroleum solvents such as dicyclohexylmethane, and terpenes such as paramenthane and pinane.

The above-mentioned (b) general formula (1): R ¹ CO
O- (AO) _n -R ² (R ¹ is an alkyl group having 1 to ² carbon atoms, R ² is an alkyl group having 1 to 8 carbon atoms, and A is 2 to 2 carbon atoms.
3 is an alkylene group, and n is an integer of 1 to 5. The compound represented by (4) is selected in consideration of required properties such as environmental characteristics, odor, and flammability, and excellent cleaning power for adhesives and protective films in addition to petroleum pitch. From these viewpoints, R ¹ in the general formula (1) is preferably a methyl group. A is an adduct of ethylene group or propylene group, or a mixed adduct thereof. Specific examples of the compound represented by the general formula (1) include diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monobutyl ether acetate, dipropylene glycol monoethyl ether acetate, and diethylene glycol monoethyl ether acetate. Examples include propylene glycol monobutyl ether acetate. In the general formula (1), when R ¹ and R ² are hydrogen atoms or when n is 6 or more, the hydrophilicity becomes too strong and the solubility in the adhesive or the protective film is insufficient. When n is 0, problems such as odor and flammability remain, and when R ¹ has more than 3 carbon atoms, it may become solid, which is not preferable in handling.

The industrial cleaning agent for lens cleaning according to the present invention generally comprises about 30 to 95% by weight of the component (a) and (b).
The main component is about 5 to 70% by weight. It is preferably about 50 to 80% by weight of the component (a) and about 20 to 50% by weight of the component (b).
When the content of the component (a) is less than 30% by weight, the detergency for petroleum pitch is insufficient, and when it exceeds 95% by weight, the detergency for the adhesive and the protective film is insufficient, which is not preferable. . On the other hand, if the content of the component (b) is less than 5% by weight, the detergency for the adhesive or the protective film is insufficient, and if it exceeds 70% by weight, the detergency for the petroleum pitch is lowered. Not preferable.

The industrial cleaning agent for lens cleaning according to the present invention comprises (c) in addition to the components (a) and (b).
By including the surfactant, the stability and the water rinsing property of the detergent can be improved. (C) As the surfactant, one of various types of anionic surfactant, cationic surfactant, amphoteric surfactant and nonionic surfactant is selected singly or in appropriate combination of two or more. However, in the present invention, it is preferable to use a nonionic surfactant.

Specific examples of the nonionic surfactant include:
Polyoxyalkylene alkyl (alkyl group having 6 carbon atoms
Above) Polyalkylene glycol ether type nonionic surfactants such as ethers, polyoxyalkylene phenol ethers and polyoxyalkylene alkylphenol ethers; polyalkylene glycol ester type nonionic interfaces such as polyalkylene glycol monoesters and polyalkylene glycol diesters Activator;
Examples thereof include alkylene oxide adducts of fatty acid amides; polyhydric alcohol type nonionic surfactants such as sorbitan fatty acid esters and sucrose fatty acid esters; fatty acid alkanolamides and polyoxyalkylene alkylamines. Here, the alkylene refers to ethylene, propylene or butylene, and the polyoxyalkylene refers to polyoxyethylene, polyoxypropylene, polyoxybutylene or a copolymer thereof.

Among these nonionic surfactants, polyethylene glycol ether type nonionic surfactants are preferred from the viewpoint of detergency. More preferred is general formula (2): R ¹ —O— (CH ₂ CH ₂ O) _m —H (wherein R ¹ is a linear or branched alkyl group or alkenyl group having 6 to 20 carbon atoms). , Phenyl group, or 7 to 7 carbon atoms
12 represents a phenyl group substituted with 12 linear or branched alkyl groups, and m represents an integer of 2 to 20. ). Particularly, R ¹ is an alkyl group having 8 to 16 carbon atoms, and m is preferably an integer of 3 to 16. Moreover,
Among these nonionic surfactants, HLB is 10 to 1
5 is particularly preferable in terms of water rinsing property.

In the industrial cleaning agent for lens cleaning of the present invention,
When the surfactant (c) is contained, its content is usually about 30% by weight or less. It is preferably 3 to 20% by weight. If it exceeds 30% by weight, the detergency of the petroleum pitch is lowered, which is not preferable. Even when the surfactant (c) is contained, the contents of the components (a) and (b) are in the same range as described above.

Furthermore, the industrial cleaning agent for cleaning lenses according to the present invention generally contains (d) water in addition to the above-mentioned components (a), (b) and (c) to give the cleaning agent. The non-flammability of can be secured.

The content of (d) water in the detergent is usually about 15% by weight or less, preferably 5 to 10% by weight. If it exceeds 15% by weight, the detergency is deteriorated, which is not preferable. When (d) water is contained, it is preferable to use a nonionic surfactant having an HLB of 7 to 10 from the viewpoint of stability of the detergent. Further, it goes without saying that nonionic surfactants (especially those having HLB of 10 to 15) other than those exemplified above can be used in consideration of the water rinsing property. Even when water is contained, the content ratios of the component (a) and the component (b) and the content ratio of the component (c) are in the same range as described above.

Further, the industrial cleaning agent for lens cleaning of the present invention may contain a glycol ether compound, an organic solvent, an inorganic builder, etc. within a range not impairing the characteristics of the cleaning agent of the present invention.

The temperature at which the industrial cleaning agent for lens cleaning of the present invention is brought into contact with lenses to wash and remove the petroleum pitch, the adhesive, the protective film and the like adhering to the lenses is not particularly limited. However, the cleaning agent is usually at room temperature to
Used in the range of 95 ° C. Also, the cleaning time is usually
It takes about 10 seconds to 30 minutes.

The means for bringing the industrial cleaning agent for lens cleaning of the present invention into contact with lenses is not particularly limited, and various known means can be adopted. For example, a method of directly immersing an article to be cleaned in the cleaning agent, a method of flushing the cleaning agent using a spray device, a method of brushing by a mechanical means, an ultrasonic cleaning method, a submerged jet cleaning method. Various methods such as a rocking method, a direct cleaning method (for example, a method using a direct cleaning apparatus “Direct Path”, manufactured by Arakawa Chemical Industry Co., Ltd.) can be appropriately selected and employed. In particular, the direct cleaning method enables cleaning in a short time even when the content of the active ingredient in the cleaning agent is extremely low.

The lenses from which the petroleum-based pitch and the like have been washed and removed in this way are optionally rinsed and then dried. As a rinse treatment agent, water or a petroleum solvent,
Examples thereof include glycol ethers and alcohols.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 An industrial detergent comprising 80% by weight of tetradecene and 20% by weight of diethylene glycol monoethyl ether acetate was prepared.

Example 2 65% by weight of octadecene, 25% by weight of diethylene glycol monoethyl ether acetate and polyoxyethylene (9 moles added) nonyl ether (HLB value 1
3) An industrial detergent consisting of 10% by weight was prepared.

Example 3 Octadecene 60% by weight, diethylene glycol monobutyl ether acetate 20% by weight, polyoxyethylene (8 moles added) oleyl ether (HLB number 8) 1
An industrial detergent consisting of 5% by weight and 5% water was prepared.

Example 4 55% by weight of tetradecene, 20% by weight of diethylene glycol monoethyl ether acetate, 10% by weight of polyoxyethylene (9 moles of addition) and 10% by weight of oleyl ether of polyoxyethylene (8 moles of addition) and An industrial detergent consisting of 5% water was prepared.

Comparative Example 1 An industrial detergent containing 70 parts by weight of octadecene and 30% by weight of ethylene glycol monoacetate was prepared.

Comparative Example 2 An industrial detergent comprising 80% by weight of tetradecene, 15% by weight of polyoxyethylene (8 moles added) oleyl ether and 5% by weight of water was prepared.

Comparative Example 3 An industrial detergent comprising 70 parts by weight of octadecene, 10 parts by weight of diethylene glycol monohexyl ether, 10% by weight of polyoxyethylene (8 moles added) nonyl ether and 10% of water was prepared.

Comparative Example 4 70% by weight of diethylene glycol monobutyl ether,
Polyoxyethylene (7 moles added) Nonyl ether 2
An industrial detergent comprising 5 parts by weight and 5% by weight of water was prepared.

Cleaning Test 1 Optical lens (30 mmφ) 50 with petroleum pitch attached
The individual pieces are placed in a basket-like container having a hole of 10 cm × 10 cm × 10 cm, and the container is cleaned with an ultrasonic cleaning device (28 k
Hz, 600 W) and washed with the industrial detergent prepared in Examples and Comparative Examples at 60 ° C. for 2 minutes,
A rinse treatment was performed twice with water for 2 minutes × 2 times. In addition, 8
It was dried with hot air at 0 ° C. for 10 minutes.

Cleaning Test 2 The cleaning test 1 was carried out in the same manner as the cleaning test 1 except that an optical lens, which was an object to be cleaned, had an adhesive and a protective film attached thereto in addition to the petroleum pitch.

The degree of removal of the petroleum pitch, the adhesive and the protective film adhered to the optical lens that had been subjected to the cleaning treatment in the cleaning test was judged based on the following criteria to evaluate the cleaning property. Table 1 shows the evaluation results. ○ ---- No petroleum pitch, adhesive, or protective film remained on the optical lens. Δ ---- Petroleum pitch, adhesive or protective film remains on less than 3% of the optical lens. × −−− Petroleum pitch, adhesive, or protective film remained on 3% or more of the optical lens.

[0034]

[Table 1]

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C11D 7/24 C11D 7/24 7/26 7/26

Claims (8)

[Claims] 1. A hydrocarbon solvent having 6 to 30 carbon atoms, and (b) a general formula (1): R ¹ COO- (AO).
_n -R ² (R ¹ is an alkyl group having 1 to 2 carbon atoms, R ² is an alkyl group having 1 to 8 carbon atoms, A is an alkylene group having 2 to 3 carbon atoms, n is an integer of 1-5. ) An industrial cleaning agent for lens cleaning, which comprises a compound represented by 2. The cleaning agent according to claim 1, which comprises 30 to 95% by weight of the component (a) and 5 to 70% by weight of the component (b). 3. The cleaning agent according to claim 1, further comprising (c) a surfactant. 4. The (c) surfactant has an HLB value of 10 to 1.
The cleaning agent according to claim 3, which is the nonionic surfactant of No. 5. 5. Further, (c) a surfactant and (d)
The cleaning agent according to claim 1 or 2, which contains water. 6. The (c) surfactant has an HLB value of 7 to 10.
6. The cleaning agent according to claim 5, which is the nonionic surfactant. 7. The cleaning agent according to claim 3, which contains the component (c) in an amount of 30% by weight or less. 8. The cleaning agent according to claim 5, which contains the component (d) in a proportion of 15% by weight or less.