CN100432750C - Manufacturing method of composite photochromic optical resin lens - Google Patents

Abstract

The invention is a manufacturing method of composite photochromic optical resin lens, which includes preparing the base layer lens, surface treatment, and clamping the glass mold with a tape machine; weighing the chemical monomer added with the chain transfer agent, and then adding the discoloration Dyes, additives and initiators containing tert-butyl peroxyneodecanoate and tert-butyl peroxy-2-ethylhexanoate, stirred evenly, vacuum defoaming; and chemical monomers, color-changing dyes, chain transfer agents, initiators The weight ratio of the agent is: 1900: 0.03: 98.77: 1.2 or 1800: 0.05: 100: 0.8; the prepared monomer is injected into the combined base lens and mold, molded and demolded, and secondary cured after cleaning. The present invention solves the defects that most of the photochromic resin lenses are fully dye-added, and has uneven discoloration layer and insensitive response, and improves the optical precision; a chain transfer agent is added in the batching section to make the polymer structure more Uniform and stable, the pass rate of the product is greatly increased.

Description

Manufacturing method of composite photochromic optical resin lens

technical field

The invention relates to a manufacturing process of an optical resin lens, in particular to a manufacturing method of a composite photochromic optical resin lens.

Background technique

Photochromic optical resin lenses are high-grade resin lenses newly developed at home and abroad in recent years. It is a special material for making spectacle lenses among polymer materials at present. It has the unique advantages of light texture, compact molecular structure, good optical performance, and high dispersion coefficient, especially the ability to effectively prevent ultraviolet rays from changing with the intensity and color of ultraviolet rays in sunlight. . The manufacture of photochromic optical resin lenses contains high technical content, and is a high-tech domestically and internationally. At present, the production of such lenses in China has just started. At present, most of the photochromic resin lenses are fully dye-added, and there are defects such as uneven color-changing layer and insensitive response.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for manufacturing a composite photochromic optical resin lens with uniform discoloration and quick response.

The present invention is achieved like this: it comprises the steps:

1) Prepare the base lens, and after the surface treatment and inspection are qualified, the mold is closed with a tape machine together with the glass mold;

2) Weighing chemical monomers, adding color-changing dyes, additives and initiators, stirring evenly, and vacuum defoaming;

3) Inject the prepared monomer into the assembled base lens and mold, form and demould, and perform secondary curing after cleaning;

It is characterized by:

1) A chain transfer agent is added to the chemical monomer: 2,4-diphenyl-4-methyl-1-pentene;

2) The surface treatment of the base lens includes alkali etching, cleaning, drying, ion beam, and gluing;

3) The initiator is tert-butyl peroxyneodecanoate and tert-butyl peroxy-2-ethylhexanoate in a ratio of 1:1;

4) The main components of chemical monomers are benzyl methacrylate and 2,4-bis[4-(formylpolyethoxy)phenyl]propane, the ratio of the two is 6:4, and the chemical monomer The weight ratio of body, color changing dye, chain transfer agent and initiator is: 1900: 0.03: 98.77: 1.2 or 1800: 0.05: 100: 0.8;

Add the chain transfer agent, color-changing dye and initiator in sequence while the chemical monomer is stirring at room temperature, then stir for 2 to 5 hours, pressurize and inject the assembled base lens through 5A filter paper into the mold for temperature-controlled polymerization, demoulding After cleaning, the lens is subjected to secondary curing, the maximum temperature is controlled at 80-90°C, and the time is 2-4 hours.

In the present invention, the base lens is molded and subjected to alkali etching, cleaning, drying, ion beam, and gluing surface treatment, so that the color-changing layer and the base are firmly combined to form a uniform thin layer, eliminating the dispersion of the layer bonding surface; The thin color-changing layer achieves the best color-changing effect without affecting the processing of the base layer, which greatly reduces the cost of raw materials. Optical resin materials with high purity, high light transmittance, and low flexural modulus can effectively cooperate with color-changing dyes to achieve the best color-changing sensitivity. A chain transfer agent is added during the batching, which makes the polymer structure more uniform and stable, eliminates the lens defects that occur under special light sources, and makes the qualified rate of the lens more than 90%.

Description of drawings

The accompanying drawing is a flow chart of the manufacturing process of the composite photochromic optical resin lens.

Detailed ways

According to the accompanying drawings, 1. The preparation of the primary lens:

According to the production requirements, prepare base lenses of different varieties, different curvatures, and different specifications, and undergo alkali etching, cleaning, drying, ion beam, and gluing surface treatment. After passing the inspection, the mold is closed with a tape machine, and the thickness is controlled at 0.5 ～1.2mm±0.2mm, according to different varieties, the amount of tape should be controlled within 30cm～35cm.

2. Ingredients:

Take 90-98% chemical monomers whose main components are benzyl methacrylate and 2,4-bis[4-(formylpolyethoxy)phenyl]propane, of which benzyl methacrylate, 2 , the ratio of 4-bis[4-(formylpolyethoxy)phenyl]propane is 6:4; stir at room temperature, and add 1 to 8% of 2,4-diphenyl-4 -Methyl-1-pentene; then add 0.01~0.05% color-changing dye; after stirring evenly, add 0.6~1.0% initiator, among which tert-butyl peroxyneodecanoate, 2-ethylhexyl peroxide The ratio of parts to tert-butyl acid is 1:1; after stirring for 2 to 5 hours, vacuumize for 5 to 15 minutes at a vacuum of -0.09MPa to -0.1MPa and wait for pouring.

3. Filling material:

Pour the prepared material into the combined base lens and mold, the normal pouring pressure is between 0.05MPa and 0.1MPa, and the pouring material is filtered with 5A filter paper.

4. Curing and forming:

The polymerization curing curve is used to directly control the polymerization process of monomers. During the polymerization process of raw materials, on the one hand, the volume expands when heated, and on the other hand, the volume shrinks with the increase of polymerization. Curing curve, and using computer temperature control, the temperature control curve is as follows:

The starting temperature is 35°C for 6-10 hours, then rises to 40-45°C after 12-16 hours, rises to 50-55°C after 8-12 hours, rises to 80-85°C after 6-10 hours, and then keeps warm for 2 ～6 hours, after 2～6 hours, it will drop to 30～60℃, for a total of 44～50 hours.

5. Release cleaning:

Remove the tape from the mold out of the oven at 30-60°C, put it in room temperature water, quickly remove it from the mold, and then clean the lens.

6. Secondary curing inspection:

The maximum temperature of the secondary curing is controlled at 80-90°C, and the time is 2-4 hours. Inspection after curing.

Embodiment one:

Prepare 350 base-layer lenses, after surface treatment by alkali etching, cleaning, drying, ion beam, and gluing, inspect and close the mold, and the thickness of the mold is 1.0 mm. Take 1.9Kg of chemical monomer benzyl methacrylate and 2,4-bis[4-(formylpolyethoxy)phenyl]propane in a ratio of 6:4, and add 98.77g of 2 in turn while stirring, 4-diphenyl-4-methyl-1-pentene, then add 30mg of graying dye, after stirring evenly, add 0.6g of tert-butyl peroxyneodecanoate and 0.6g of tert-butyl peroxy-2-ethyl For tert-butyl hexanoate, after stirring for 3 hours, vacuumize at -0.095Mpa for 15 minutes. Filter casting under pressure 0.05MPa, and cure with the following curing curve:

Start temperature at 35°C for 8 hours, rise to 40°C after 14 hours, rise to 50°C after 8 hours, rise to 85°C after 10 hours, then keep warm for 4 hours, drop to 50°C after 2 hours, and then furnace after 46 hours When the temperature is 50°C, take out the tape and put it in normal temperature water, remove the mold, take out the lens and then clean it. After cleaning, carry out secondary curing at a temperature of 90°C. After 2 hours, pass the inspection and put it into the warehouse.

Embodiment two:

Prepare 200 base-layer lenses, after surface treatment, check the mold closing, the thickness of the mold closing is 1.2mm. Take 1.8Kg chemical monomers benzyl methacrylate and 2,4-bis[4-(formylpolyethoxy)phenyl]propane in a ratio of 6:4, and add 100g of 2,4 -diphenyl-4-methyl-1-pentene, then add 50mg of graying dye, after stirring well, add 0.4g of tert-butyl peroxyneodecanoate and 0.4g of 2-ethylhexyl peroxide Acetate tert-butyl ester, after stirring for 4 hours, vacuumize for 15 minutes under the vacuum degree of -0.090MPa. Filter casting under pressure 0.05MPa, and cure with the following curing curve:

Start temperature at 35°C for 10 hours, rise to 40°C after 12 hours, rise to 50°C after 10 hours, rise to 85°C after 6 hours, then keep warm for 4 hours, drop to 50°C after 2 hours, and then furnace after 44 hours When the temperature is 50°C, take out the adhesive tape and put it in normal temperature water, remove the mold, take out the lens and then clean it. After cleaning, carry out secondary curing at a temperature of 90°C. After 4 hours, pass the inspection and put it into the warehouse.

Claims (3)

1. A method for manufacturing a composite photochromic optical resin lens, comprising the following steps: 1) Prepare the base lens, and after the surface treatment and inspection are qualified, the mold is closed with a tape machine together with the glass mold; 2) Weighing chemical monomers, adding color-changing dyes, additives and initiators, stirring evenly, and vacuum defoaming; 3) Inject the prepared monomer into the assembled base lens and mold, form and demould, and perform secondary curing after cleaning; It is characterized by: 1) A chain transfer agent is added to the chemical monomer: 2,4-diphenyl-4-methyl-1-pentene; 2) The surface treatment of the base lens includes alkali etching, cleaning, drying, ion beam, and gluing; 3) The initiator is tert-butyl peroxyneodecanoate and tert-butyl peroxy-2-ethylhexanoate, and the ratio of the two is 1:1; 4) The main components of chemical monomers are benzyl methacrylate and 2,4-bis[4-(formylpolyethoxy)phenyl]propane, the ratio of the two is 6:4, and the chemical monomer The weight ratio of body, color-changing dye, chain transfer agent and initiator is successively: 1900:0.03:98.77:1.2 or 1800:0.05:100:0.8; Add the chain transfer agent, color-changing dye and initiator in sequence while the chemical monomer is stirring at room temperature, then stir for 2 to 5 hours, pressurize and inject the assembled base lens through 5A filter paper into the mold for temperature-controlled polymerization, demoulding After cleaning, the lens is subjected to secondary curing, the maximum temperature is controlled at 80-90°C, and the time is 2-4 hours. 2. The manufacturing method of the composite photochromic optical resin lens according to claim 1, characterized in that: the temperature control curve during the temperature-controlled polymerization molding is as follows: the starting temperature is 35°C and the temperature is kept for 6-10 hours. Rise to 40-45°C in 12-16 hours, rise to 50-55°C in 8-12 hours, rise to 80-85°C in 6-10 hours, keep warm for 2-6 hours, and drop to 30°C in 2-6 hours ~60°C, 44-50 hours in total. 3. The manufacturing method of the composite photochromic optical resin lens according to claim 1 or 2, characterized in that: the adhesive tape machine closes the mold, the thickness is controlled at 0.5-1.2mm±0.2mm, and the amount of adhesive tape is controlled at 30cm- 35cm; take it out of the oven at 30-60°C, remove the tape, and put it in room temperature water for demoulding.

Images