JPS61249261A - Working method for optical glass - Google Patents

Abstract

PURPOSE:To make peeling work after working in an easy manner, by using an adhesive agent, which is made up of adding a solvent to a composition being hardened by ultraviolet rays and capable of giving a hardened resin film, for adhesion between optical glass and a working jig. CONSTITUTION:An adhesive agent made up of adding a solvent to a composition being hardened by ultraviolet rays and capable of giving a hardened resin film is applied, while optical glass is stuck to a working jig together with this adhesive agent and, after the ultraviolet ray is irradiated on it and hardened, working for this optical glass if carried out. And, it is heated after working, and the optical glass is peeled from the working jig. This composition is made up of adding a photopolymerization starter of benzophenone or the like in 0.5-30wt.p. and surther, if necessary, a thermal polymerization inhibitor, a chain transfer agent and a plasticizer to 100wt.p. of an simple of a bifunctional or multifunctional monomer or its mixture, in addition to a monofunctional monomer of ethylene unsaturated compound. Thus, stable adhesive capacity is securable and, what is more, operation is easily performable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for processing optical glass, and more specifically,
Improved the moisture resistance stability of the adhesive when adhering optical parts such as optical prism parts to processing jigs (grinding, polishing, etc.) and making it easier to peel them off after processing. This invention relates to a method for processing optical glass.

[Prior art] In recent years, when processing optical glass such as optical prism parts, optical glass is bonded to a processing jig using a quick-curing adhesive as a temporary adhesive, and glass cutting and polishing are performed. A method is adopted in which the material is processed as follows, and then peeled off after processing. As such adhesives, alpha cyanoacrylate instant adhesives are most often used as instant curing adhesives because of their shortening of processing time.

However, when using alpha cyanoacrylate,
There was a problem with the glass processing surface where a large amount of adhesive peeled off at certain times (during the humid summer months). This kind of adhesive peeling is caused by: ■ The cyano group (-ON) of alpha cyanoacrylate, which is an instant adhesive, is caused by the hydroxyl group (OH-) present at the glass interface.
), causing a depolymerization reaction and destroying the connective tissue that has once been made into a polymer.Due to the high humidity in summer, a large amount of water is adsorbed to the glass surface, and this adsorbed water reacts with the alpha cyanoacrylate monomer. However, a unitary structure polymer is generated, whitening occurs on the entire adhesive interface, and the adhesive action at the interface is extremely low f.
This is thought to be caused by, for example,・As shown above, alpha cyanoacrylate has excellent instant curing and is effective in terms of work efficiency, but it has major defects in adhesion to glass, making it difficult to obtain stable adhesive strength.
This has become a major problem in field work.

In addition, the criteria for use of adhesives for temporary fixing is that they must be durable against the pressure of grinding and polishing during glass processing, and that they can be easily peeled off after processing. Acrylates could not be said to be sufficient in this respect either.

[Steps and effects for solving the problems] According to the present invention, optical glass is cured for processing by applying an adhesive made by adding a solvent to a composition that can be cured by ultraviolet rays to form a cured resin film. 1. Processing of optical glass, which is characterized in that the optical glass is laminated onto a tool, cured by irradiation with ultraviolet rays, processed, and then heated after processing and peeled off from the processing jig.
A method is provided.

In the present invention, the composition (I) that can be cured by ultraviolet rays and destroys the cured resin film basically includes (a) Nanatsumer-1 (b) a photopolymerization initiator, and (C) as necessary. A composition consisting of a thermal polymerization inhibitor, a chain transfer agent, and a plasticizer that can be added depending on the purpose is used. As the heptamer component (a) in the composition, in addition to a monofunctional hetamine of an ethylenically unsaturated compound, difunctional or polyfunctional monomers may be used alone or in combination.

Examples of monofunctional monomers include styrene, vinyltoluene, N-vinylpyrrolidone, lauryl (meth)acrylate, cellosolve (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, polyethylene glycol mono(
meth)acrylate, ethylene glycol (meth)acrylate phthalate, ethylene glycol (meth)acrylate succinate, ethylene glycol (meth)acrylate hydroxyphthalate, acrylamide, diacetone acrylamide, dimethyl (meth)acrylamide, dimethylaminoethyl (meth)acrylate, Diethylaminoethyl (meth)acrylate, (meth)acryloyloxyethyl monophthalate, (meth)acryloyloxypropyl monophthalate, (meth)acryloyloxyethyl monosuccinate, (meth)acryloyloxyethylmonotetrahydrophthalate, (
Examples include meth)acryloyloxypropylmonotetrahydrophthalate, (meth)acryloyloxyethylmonohexahydrophthalate, and (meth)acryloyloxypropylmonohexahydrophthalate.

Examples of difunctional polymers include diallyl ketone, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, and hexanediol di(meth)acrylate.
Examples of polyfunctional monomers include trimethylolpropane tri(meth)acrylate,
Examples include pentaerythritol tri(meth)acrylate and pentaerythritol hexa(meth)acrylate.

(b) Examples of the photopolymerization initiator include benzophenone and its derivatives, benzoin, benzoin alkyl ether, benzylmethyl ketal, benzylmethylaminoacetophenone, dimethylaminoacetophenone, 2-dithylanthraquinone, ketone/amine mixture 1, etc. .

By using a chain transfer agent, the degree of polymerization of the polymer produced by photopolymerization can be appropriately suppressed and the adhesive strength can be adjusted. The chain transfer agent is preferably a compound having a mercapto group, such as a ketone diester having a mercapto group such as dodecylmercaptan 2-ethylhexylmercaptopropionate.

In the present invention, the composition that can be cured by ultraviolet rays to give a cured resin film includes (a) 100 parts by weight of monomer, and (b) 0.5 to 30 parts by weight, preferably 5 to 15 parts by weight of photopolymerization initiator. parts, most preferably in the range of 6 to 10 parts by weight. The photopolymerization initiator can be used alone or as a mixture of several types.

In addition, (C) among the components added as necessary, the chain transfer agent adjusts the degree of polymerization of the polymer generated during photopolymerization, and adjusts the adhesive strength (easiness of peeling from another side) of the polymer. The use of chain transfer agents gives particularly favorable results in achieving the objects of the present invention. The amount of the chain transfer agent to be used is preferably 0.01 to 4 parts by weight, more preferably 0.02 to 3 parts by weight, based on 100 parts by weight of (a) 7mer.

Properties that an adhesive for laminating and temporarily fixing optical glass to a processing jig should have are: 1) The adhesive layer can be made to 1 to 3 JL with finger pressure (i.e., low viscosity); 2) It must be durable against cutting conditions (pressure, heat, mechanical impact, wrapping, etc.), 3) Instant curing type, 4) Easy to peel off after processing, 5) Adhesion The agent must be easy to clean.

6) The adhesive itself should be little or not affected by moisture or water ugliness during the curing process or after curing.

However, in order to satisfy the above properties, a composition (I
) requires the addition of a solvent.

The type and amount of the solvent to be used are determined depending on the type and blending ratio of each component in composition (I), but in any case, the solvent should be blended so as to meet the requirements 1) to 8) above. be done.

Examples of solvents include hydrocarbon compounds, heterocyclic compounds, alcohols, esters, and ethers.

Ketones and the like can be used alone or in combination as long as they do not impair the properties 1) to 6) above. From the viewpoint of safety and hygiene, toluene is particularly preferred as it satisfies various conditions such as not having an extremely low boiling point, low toxicity, low flammability, and low explosiveness. It is a solvent.

In the method for processing optical glass of the present invention, first, the optical glass is bonded to a processing jig by applying an adhesive prepared by adding a solvent to the above-mentioned composition (I). is UV-curable and does not react easily under normal environments, so unlike conventional alpha cyanoacrylate, it does not react immediately after coming out of the adhesive container, and it is difficult to apply the adhesive. No skill is required to paste.

Next, it is cured by irradiating it with ultraviolet light. The intensity and irradiation time of the ultraviolet rays are determined as appropriate. Here, the composition CI) is cured while containing the solvent. When polymerized by ultraviolet irradiation, it is stable and substantially insoluble in solvents.

The optical glass is bonded to the processing jig by curing.

After adhering, the optical glass is subjected to processing such as grinding and polishing while being adhered to the processing jig, and then heated and peeled off from the processing jig. The heating is preferably carried out so that the temperature at the interface where the adhesive is present is approximately 80 to 110°C. The solvent encapsulated in the adhesive expands when heated, promoting the peeling action of the processing jig and the optical glass, making the peeling operation easier.

[Example] Next, the present invention will be explained with reference to Examples.

Example 1 7,100 parts by weight of diallyl ketone, 1 part by weight of a ketone diester having a mercapto group represented by the following formula, and 3 parts by weight of benzophenone were mixed, and 123 parts by weight of toluene was added thereto to produce a uniform 0.9 cps (at 25°C). Refractive index 1.49
4 (25°C) solution was obtained. This solution is applied to optical glass at a rate of 0.08 g/am2 and bonded to a processing jig. The bonding conditions at this time were to suppress the adhesive layer by approximately 0.2 kg/c layer 2 against the 6C 2-layer optical glass, and to reduce the adhesive layer thickness to 1.
- 3 ends (adhesion surface Newton number 1-3).

Next, the distance from the ultraviolet generator tube to the adhesive layer is 130 inches,
UV illuminance 5.2mW/c■2 (on top of optical glass)
, irradiated with ultraviolet rays under the conditions of 52 seconds of ultraviolet irradiation time,
hardened.

Next, the optical glass bonded to the processing jig was processed by grinding and polishing. There was no peeling of the adhesive during optical glass processing, and the processing was performed well.

After processing, the interface between the optical glass and the processing jig is 100%
The optical glass was peeled off from the processing jig by heating to a temperature of .degree. The force required for peeling off was small, and the peeling work was very easy.

[Effects of the Invention] In the present invention, an adhesive made by adding a solvent to a composition that can be cured by ultraviolet rays to form a cured resin film is used to bond optical glass and a processing jig. The adhesive can be easily cured, and during processing, it will not peel off even under processing pressure such as grinding and polishing.
After processing, the solvent sealed in the adhesive layer is expanded by heating to promote the peeling action of the optical glass and the processing jig, and the peeling action can be performed very easily. In addition, the composition, which can be cured by ultraviolet rays to form a cured resin film, is not affected by moisture or hydroxyl groups during the curing process or after curing, and can ensure stable adhesive performance even at high temperatures such as in the summer, and does not require any skill to work. It has excellent characteristics.

Claims (1)

[Claims] (1) Apply an adhesive made by adding a solvent to a composition that can be cured by ultraviolet rays to form a cured resin film, bond the optical glass to a processing jig, and cure it by irradiating it with ultraviolet rays. A method for processing optical glass, which comprises processing, heating after processing, and peeling off the optical glass from a processing jig.