JP3146548B2 - Surface cleaning / modification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning and modifying the surface of a plastic lens in hard coating of the lens.

[0002]

2. Description of the Related Art A conventional method of cleaning and modifying the surface of a plastic lens in hard coating is generally performed by dissolving or removing dirt adhering to the lens surface using an immersion type cleaning device. Had been
In addition, dirt firmly adhered or a plurality of different types of dirt have been dealt with by using ultrasonic waves, megasonics and the like and using various kinds of organic solvents and surfactants.

[0003]

In the above prior art, dirt firmly adhered to the surface of the lens, and a heterogeneous layer on the surface formed by the deterioration of the lens at the molding stage or after molding are sufficiently removed. However, there is a problem that this may cause a defect in appearance of the hard coat film, a decrease in adhesion, and a decrease in dyeing characteristics such as color unevenness. Further, in the prior art, there are problems that the number of processes is 13 to 15 and the size of the apparatus is large, and a long time is required for processing.

[0004] The present invention solves such a problem, and performs a surface modification such as complete cleaning and homogenization / activation of the lens surface, and at the same time, enhances an anchoring effect and improves the appearance of the hard coat film. For lens substrates that can improve the quality and adhesion between the hard coat film and the surface to be coated, that is, the lens surface, and that can be dyed, improve and improve the dyeing characteristics. It aims to provide a method.

[0005]

The surface cleaning / modifying method of the present invention is to clean the surface to be coated by scrubbing the surface of the plastic lens before applying the hard coat liquid to the plastic lens. At the same time as performing surface modification such as homogenization and activation, the anchor effect enhances the appearance quality of the hard coat film and the adhesion between the hard coat film and the surface to be coated, that is, the surface of the lens, and enables dyeing. The lens is characterized in that its dyeing characteristics are improved.

[0006]

In the present invention, the surface layer on the surface to be coated of the lens substrate is physically peeled and removed by using an abrasive, so that the dirt adhering to the surface and the lens forming step or after forming the lens are obtained. The heterogeneous surface layer formed due to deterioration or the like is removed.

[0007] Therefore, appearance defects such as "cissing" due to dirt can be completely prevented, and the hard coat layer and the lens surface can be sufficiently adhered and bonded without being hindered by the heterogeneous layer, thereby improving the adhesion. I do. In addition to this effect, the adhesion is further improved by the activation of the surface by polishing and the anchor effect by fine polishing flaws.

[0008] The fine abrasive scratches improve the wettability of the substrate, prevent "sink" and improve the appearance quality.

Furthermore, in the case of a lens that can be dyed, since the surface layer that determines the dyeing properties is homogenized, uneven dyeing or the like is less likely to occur, and the dyeing characteristics can be improved at the same time.

[0010]

【Example】

(Embodiment 1) FIG. 1 shows an example of a surface polishing apparatus used for surface cleaning / modification. The plastic lens 1 is fixed by the suction pad 2 and about 800 rpm around the geometric center.
Rotate with. A urethane sponge 3 for polishing containing an abrasive (alumina-based abrasive Polypla 103 (Fujimi Sangyo Co., Ltd.)) was pressed against the surface of the plastic lens with a load of about 400 g while rotating at about 80 rpm. The abrasive is moved from the center to the outer periphery at a rate of about 0.4 cm / sec.
/ Min.

The surface of a plastic lens (CR-39) containing diethylene glycol bisallyl carbonate as a main component was polished by using the polishing apparatus having the above structure. Thereafter, the abrasive on the lens surface was washed away with pure water, and dried by a spin method. On this lens surface,
87 parts by weight of butyl cellosolve, 45 parts by weight of colloidal silica, α-glycidoxypropyltrimethoxysilane 1
9 parts by weight, 0.05 part by weight of a silicone surfactant,
A hard coat solution consisting of 5.35 parts by weight of 0.05N hydrochloric acid, 1.0 part by weight of magnesium perchlorate, 0.05 part by weight of an ultraviolet absorber, and 21 parts by weight of Denacol EX313 (Nagase & Co., Ltd.) was spin-coated. Then, it was baked at 135 ° C. for 3 hours to obtain a hard coat lens (A).

Next, the same plastic lens (CR-39) as described above was immersed in a solvent such as a surfactant, an aqueous alkali solution, or salt solution under the same conditions as in the prior art multi-tank cleaning liquid apparatus, and then subjected to the same conditions as above. To obtain a hard-coated lens (B).

Further, the same plastic lens (CR-39) as described above was wiped by hand with acetone, and hard-coated under the same conditions as described above to obtain a hard-coated lens (C).
I got

As a result, the hard coat lens (A),
In (B), no appearance defect was recognized, but in the hard-coated lens (C), many appearance defects such as “repelling” and “sinking” occurred. (Example 2) Hard coat lens (A) obtained in Example 1
(B) and (C) were subjected to two types of durability tests of warm water resistance and moisture resistance. The durability was evaluated based on the degree of film peeling caused by the Nichiban tape at the cross-cut flaws.

The results are shown in Table 1 together with the time required for each surface cleaning / reforming.

[Table 1] The hard-coated lens (A), in which the plastic lens substrate has been cleaned and modified by surface polishing, has been cleaned and modified using the conventional solvent immersion method, despite the extremely short time required for cleaning and modification. Durability equivalent to that of the quality hard-coated lens (B) was obtained. Example 3 A plastic lens containing styrene and 22-bis- [3,5-dibromo-4-(-2-methacryloxyethoxy) -phenyl] propane as main components was
After polishing the surface under the same conditions as in Example 1, it was dyed with a disperse dye to obtain a color lens (D).

On the other hand, after the plastic lens substrate was cleaned and modified by the solvent immersion method under the same conditions as in Example 1,
Dyeing was performed under the same conditions as above to obtain a color lens (E).

As a result, the color lens (D) was uniformly dyed without any uneven dyeing or the like. on the other hand,
In the color lens (B), uneven dyeing occurred on the entire surface.

[0018]

As described above, according to the surface cleaning / modifying method of the present invention, the surface modification such as cleaning, homogenization / activation and the like of the plastic lens surface can be performed with a simple and short-time treatment. While improving the quality, the anchor effect can be enhanced, the appearance quality of the hard coat film and the adhesion between the hard coat film and the plastic lens can be enhanced, and the dyeing characteristics of the plastic lens that can be dyed can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a surface polishing apparatus used for surface cleaning / modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic lens 2 Suction pad 3 Urethane sponge for polishing 4 Abrasive discharge port 5 Plastic lens rotating shaft 6 Urethane sponge fixing arm for polishing 7 Urethane sponge drive belt for polishing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08J 7/00 C08J ⁷ /04-7/06 G02C 7/02-7/08 G02B 1/10-1 / 12

Claims (1)

(57) [Claims] 1. A method for cleaning and modifying a surface of a plastic lens, wherein the surface of the plastic lens is scrubbed before applying a hard coat liquid to the plastic lens.