KR100896877B1 - Process of antistatic coating with aqueous two component and spectacle lens with coating layer by the process - Google Patents

Abstract

The present invention relates to a two-component antistatic protective coating method of the lens and the spectacle lens with a protective coating layer formed by the method, and more particularly to physically protect the spectacle lens and to prevent degradation of the super water-repellent function of the outermost layer In addition, it suppresses the generation of static electricity and prevents contamination from dust in the air, and it is a synthetic resin adhesive, solvent, and antistatic agent as a primer for the purpose of enabling good processing without axial deviation during post processing of the lens. Forming a primary coating film on the surface of the spectacle lens by dipping or spraying the spectacle lens into the primary coating solution, and drying the sprayed optical film; 2-component antistatic protection of the lens comprising the step of forming a secondary coating film on the surface of the primary coating film by dipping or spraying the spectacle lens formed with the primary coating film on the secondary coating solution composed of fluorocarbon resin, solvent A spectacle lens having a coating method and a protective coating layer formed thereon is proposed.

Description

A two-component antistatic protective coating method of a lens and an eyeglass lens having a protective coating layer formed thereon {PROCESS OF ANTISTATIC COATING WITH AQUEOUS TWO COMPONENT AND SPECTACLE LENS WITH COATING LAYER BY THE PROCESS}

The present invention physically protects the spectacle lens and prevents the super water repellent function of the outermost layer from being reduced while preventing static electricity from being contaminated and preventing the lens from being contaminated from dust or other foreign matter in the air, and without causing a shaft shift during the jade processing of the lens. It relates to a new lens coating packaging material that can be processed.

In general, a paper bag packaging material is used to protect the surface of the spectacle lens in the process of distributing the spectacle lens, but according to these methods, there is a problem such as a physical change of the spectacle lens surface in the process of distributing the spectacle lens for a long time. Frequent.

To this end, in recent years, in addition to a paper bag, a specific coating solution is applied to the lens surface in order to protect the surface of the spectacle lens and then circulated in a cured state. This is also used.

However, the coating film for protecting the surface of the conventional spectacle lens comprises a strong toxic solvent, and in particular, since the coating film is applied to the lens surface having a super water-repellent property, there is a disadvantage in that the coating film is easily dropped during distribution due to poor adhesiveness. In addition, as time passes, the fluorine resin contained in the one-component coating film migrates to the surface of the eyeglass lens protective film, and the adhesion decreases further. Also, due to the generation of static electricity on the surface, foreign matter such as dust adheres, thereby degrading the lens function. There is such a problem. As such, the use of a toxic solvent like the conventional lens coating film not only causes environmental pollution, but also adversely affects the function of the spectacle lens, resulting in a decrease in the super water-repellent function. For example, a conventional lens protective coating film is used by dissolving synthetic resin in an aromatic solvent such as toluene, xylene, or dipping coating by adding a small amount of fluorine-based hydrocarbon resin for the purpose of controlling water repellency and surface activity. Poor adhesion and poor compatibility with the base resin may cause a variety of problems in the coating film. Therefore, a large amount of fluorine resin cannot be added to the synthetic resin solution. Therefore, when a small amount of fluorine resin is added, there is a blind spot that cannot satisfy the pollution resistance and water repellency characteristics.

In addition, when the spectacle lens formed with the coating film is stored and distributed for a long time in an existing packaging paper bag, the protective coating film may be damaged by friction or pressure with the paper bag, and the pattern printed on the inside of the paper bag on the lens surface Markings, etc., deteriorate the transparency of the lens, and contaminate the surface, resulting in inaccurate results when measuring and confirming the characteristics of the lens.

As such, the method of using the protective coating film has the advantage of being able to mass produce and reduce the cost compared to the adhesive tape protection method, which has been used most in the past, but it is necessary to study further because it does not completely solve the above-mentioned problems. .

The present invention has been made to solve the above problems, in particular, considering that the outermost layer of the lens has a super water-repellent feature, it is possible to improve the adhesion of the coating solution when forming the primary coating solution according to the lens primary dipping, Contamination can be prevented, and the surface coating and antifouling property are provided through water repellent when forming the secondary coating solution according to the secondary deposition, and in the chemical composition of the solution, only pure water is used instead of toxic organic solvents to form an eco-friendly coating film. Furthermore, it is an object of the present invention to provide a two-component antistatic protective coating method of a lens that can prevent the appearance and function characteristics from deteriorating even during long-term storage, and a spectacle lens having a protective coating layer formed thereon.

In the method of forming the protective coating layer of the present invention for achieving the above object, a primary coating film is formed on the surface of the spectacle lens by dipping or spraying the spectacle lens in a primary coating solution composed of a synthetic resin adhesive, a solvent, and an antistatic agent as a primer. Making a step; Forming a secondary coating film on the surface of the primary coating film by dipping or spraying the spectacle lens in which the primary coating film is formed on the secondary coating solution composed of a fluorine resin and a solvent.

Here, the synthetic resin of the primary coating solution may be selected from the group consisting of urethane, epoxy, acrylic, vinyl acetate-based adhesive, the solvent in the group consisting of water, methanol, isopropyl alcohol, methyl ethyl ketone (MEK) It may be one or two selected liquid mixture.

According to this method, a primary coating film having excellent adhesion and stain resistance and antifouling properties is formed on the surface, and a spectacle lens having a secondary coating film having water repellency as a water film on the surface of the primary coating film is laminated.

The present invention is to use a toxic solvent, including problems that may occur during the production and distribution of super water-repellent spectacle lenses, that is, peeling problems due to poor adhesion of the coating film, pollution problems in which dust is introduced by static electricity generation. It is possible to provide more stable products by solving environmental hazards and the like, thereby providing more stable products.

This advantage is in line with a variety of international standards, so exports also have a very favorable effect, such as the ability to compete with other countries' products.

The spectacle lens surface protective coating layer according to the present invention is a two-component type, and the primary coating layer is an adhesive primer to be adhered to the surface of the spectacle lens without water repellency without being peeled off. Based on acrylic and vinyl acetate resins, methanol or water may be used as the solvent, and a mixed solvent of methyl ethyl ketone (MEK) and isopropyl alcohol may be used.

In addition to the resin and the solvent, the primary coating film may include an antistatic agent for antistatic and an additive for coating uniformity and stabilization, and a curing agent may be included according to the type of the selected resin.

The preferred composition ratio of the primary coating solution is urethane, epoxy, acrylic, vinyl acetate-based resin 15-30% by weight, water or methanol or 70-85% mixed solvent of MEK and isopropyl alcohol, antistatic agent 0.2-5% %, Various additives such as stabilizers, curing agents, etc. may be added in the range of 1 to 3% by weight, and the MEK and isopropyl alcohol may be used independently as well as their mixed solution.

In order to coat the primary coating solution made of such a composition on the surface of the spectacle lens, the prepared primary coating solution is dipped out, and then dried in a 40 to 60 ° C. environment for 2 to 10 minutes.

The water-soluble adhesive formed as described above has a viscosity of 20 to 30 cps / sec (20 ° C.), and has excellent adhesion to the surface of the spectacle lens having water repellent properties, and does not produce a film even when stored for a long time and has a fast curing speed.

In the case where the antistatic agent is mixed at 5 wt% or more, since the coating liquid is clouded and hinders the light transmission after the coating film is formed, the antistatic agent is preferably 5 wt% or less, and more preferably 0.5 to 2 wt%.

While the primary coating solution prepared as described above has the advantage of having pollution resistance and antifouling properties by an antistatic agent without deteriorating light transmittance, there is a disadvantage in that the water repellency is deteriorated. It can be solved by coating.

In the lens protective coating layer according to the present invention, a secondary coating layer having sufficient water repellency and antifouling property is laminated on the surface of the primary coating layer, and the material used for the secondary coating layer includes a fluorine resin, that is, a fluorine surfactant using fluorine. Examples include, but are not limited to, a water film of Japan Daikin Corporation or Viton A of DuPont Corporation.

The secondary coating solution further includes a solvent for dispersing or dissolving the fluororesin, and the solvent for forming the secondary coating solution may be water in consideration of environmental friendliness, alcohol less harmful to the human body as a substitute for water Can be used.

Although the mixing ratio of the fluororesin and the solvent is preferably mixed in a ratio of 1: 4, the applicable range can be adjusted within the range of 1: 3 to 1: 5.

After dipping the spectacle lens in which the primary coating film was formed on the secondary coating solution prepared as described above, and taking out and drying for 15 to 40 minutes in a 50-65 ° C. environment, the initial water repellency characteristics of the spectacle lens were maintained together with the characteristics of the primary coating solution. I can keep it.

Herein, the coating film forming process described above illustrates a method of dipping the spectacle lenses in the first and second coating liquids, but in addition, the coating film may be formed by spraying.

Example 1

To prepare the primary coating solution on the surface of the spectacle lens, 15% by weight of polyvinyl butylal resin (PVB), 80% by weight of methanol as a solvent, 3% by weight of additives for stabilization and coating uniformity As an antistatic agent for antistatic, 0.5 wt% of JISTAT 2000NT of Sino-Japan Emulsion Co., Ltd. was mixed and stirred for 24 hours to prepare the primary coating solution (primer) of the spectacle lens, and the primer lens was water-repellent on the surface. After dipping, and dried for 5 minutes in a 50 ℃ environment to prepare a primary coated spectacle lens.

Next, in order to prepare the secondary coating solution of the spectacle lens, Dyneon ^TM 220 (trade name) of Dyneon of Germany as a fluorine resin currently commercially available as an aqueous dispersion solution in water at a ratio of 1: 4 (water: fluorine resin = 4). After diluting to 1), the secondary coating solution of the spectacle lens was prepared by sufficiently stirring the above, and after dipping the spectacle lens having the above-mentioned first coating solution in the coating solution in a second manner, the second coating was dried at 60 ° C. for 30 minutes. Eyeglass lenses were used.

Example 2

In order to prepare the primary coating solution on the surface of the spectacle lens, 18% by weight of commercially available water-soluble polyurethane, 76% by weight of water as a solvent, 2% by weight of a urethane curing agent, and antistatic agent for urethane for antistatic The primary coating liquid (primer) of the spectacle lens was prepared by mixing 0.5% by weight of JISTAT 2000NT and 2% by weight of additives for stabilization and coating uniformity of these mixed solutions and stirring for 24 hours. The spectacle lens with the surface water repellent was dipped and dried at 50 ° C. for 5 minutes.

Thereafter, the secondary coating solution was prepared and the coating was carried out in the same manner as in Example 1 to prepare a secondary coated spectacle lens.

Example 3

In order to prepare the primary coating solution on the surface of the spectacle lens, 20 wt% of ethylene vinyl acetate (EVA) and 80 wt% of a mixed solvent of methyl ethyl ketone (MEK) and isopropyl alcohol were mixed. To prepare a resin solution by dissolving so that the solid content was 10%, and adding 2% by weight of an additive for coating uniformity and 2% by weight of an antistatic agent for urethane antistatic agent JISTAT 2000NT to 94% by weight of the resin solution, respectively. After preparing the primary coating solution by stirring for 24 hours, the spectacle lens with the surface water repellent was dipped and dried at 50 ° C. for 5 minutes.

Thereafter, Viton A, commercially available as a fluorine resin, was mixed and diluted with methyl ethyl ketone (MEK) in a 4: 1 ratio (MEK: fluorine resin = 4: 1), and The spectacle lens on which the primary coating solution was formed was secondly dipped and then dried at 60 ° C. for 30 minutes.

[Comparative Object 1]

Eyeglass lenses treated with a water repellent coating not treated with the coating solution were used as they were.

[Comparative Object 2]

Only the primary coating liquid (primer) used in Example 2 was dip-coated to the spectacle lens, and the spectacle lens which was not used as the coating liquid to which the secondary coating liquid fluorine resin and the antistatic agent were added was used.

[Test Methods]

For the spectacle lenses according to Examples 1 to 3 and the spectacle lenses of Comparative Objects 1 and 2, the transmittances before and after coating of the coating solution were measured using a spectrometer, S-3100 (model name) of SINCO Corporation. In order to measure the contact angle after the coating liquid was applied using a contact angle measuring device, which is a DSA-100 (model name), and to determine whether the residues were generated, each contact angle before the coating liquid was applied and after the peeling of the coating liquid was measured. The result was obtained.

TABLE 1

division Example 1 Example 2 Example 3 Comparison 1 Comparison 2 Transmittance (%) 98% before application 98% before application 98% before application 98% before application 98% before application 93% after application 93% after application 93% after application - 93% after application Contact angle after coating (°) 110 ° 110 ° 105 ° - 88 ° Axis deviation rate (%) 0% 0% 0% 0% 0% Residue generation (contact angle) 112 ° before application 111 ° before application 113 ° before application 112 ° before application 112 ° before application 112 ° after peeling 111 ° after peeling 113 ° after peeling - 111 ° after peeling

The transmittance is an important factor in confirming lens information after coating liquid application, and even if the coating liquid is applied, the transmittance should be as close as possible to the transmittance before coating liquid coating. In other words, when checking the center point (focal point), focal point of the spectacle lens, and the diffraction axis in the case of astigmatism lens, it is measured by measuring equipment such as lens meter based on transmission.If the transmittance is low after coating liquid coating, it is difficult to measure. Because.

Looking at the transmittance after coating liquid coating in Table 1, in the case of Examples 1 to 3 and Comparative Object 2, all of the transmittances after coating liquid coating were measured at 93%, and it was confirmed that a good state was achieved.

On the other hand, the contact angle is a numerical value indicating the degree of water repellency due to the surface tension, indicating that the water repellency is relatively low when the contact angle is 90 degrees or less, and the water repellency is good when the contact angle is 90 degrees or more.

However, an excessively large contact angle is such that the surface tension is so large that water hardly gets wet. In this case, since the processing of the spectacle lens is difficult, the proper contact angle in the spectacle lens is in the range of 90 to 120 °.

In consideration of this, in the case of Examples 1 to 3, the contact angle of the surface to which the coating liquid was applied was measured to be in a range of 105 to 110 °, thereby achieving a good state, while the contact angle after the application of Comparative Object 2 to which only the first coating liquid was applied was 88. Measured by °, it can be confirmed that the water repellency is reduced.

On the other hand, the incidence of axial displacement was all in good condition except for Comparative Example 1, in which the coating solution was not applied at all, and after processing the spectacle lens in the state in which the primary and secondary coating solutions were applied to measure the occurrence of residues, Also in the contact angle measurement after peeling off each coating liquid, in the case of Examples 1 to 3, the contact angle was almost the same as before the coating liquid was applied, showing a good state in which no residue remained.

Claims (6)

15-30% by weight of a synthetic resin adhesive selected from the group consisting of urethane, epoxy, acrylic and vinyl acetate adhesives as primers, 70 to 85% by weight of one or two solvents selected from the group consisting of water, methanol, methyl ethyl ketone (MEK) and isopropyl alcohol, Forming a primary coating film on the surface of the spectacle lens by dipping or spraying the spectacle lens in a primary coating solution composed of 0.2 to 5% by weight of an antistatic agent; Fluorine resin, The primary coating film was formed in the secondary coating solution in which one or two solvents selected from the group consisting of water, methanol, methyl ethyl ketone (MEK), and isopropyl alcohol were formed at a ratio of 1: 3 to 1: 5, respectively. Forming a secondary coating film on the surface of the primary coating film by dipping or spraying the spectacle lens to dry; a two-component antistatic protective coating method of a lens comprising a. delete delete delete delete The method of claim 1, wherein the primary coating film having a stain resistance and antifouling properties is formed on the surface of the spectacle lens, the secondary coating film having a water-repellent property is laminated on the surface of the primary coating film 2 Glasses lens with a liquid antistatic protective coating layer formed.