Lens pressurized high temperature dyeing process

Abstract

The present application relates to a kind of lens pressurization high-temperature dyeing processes, comprising the following steps: S1, prepare dyeing solution, add in dyeing cavity;S2, clean lens is placed in the dyeing solution, the dyeing cavity is sealed pressurization and temperature is raised, in the condition that temperature is 101 DEG C-120 DEG C, pressure is 1.0-3.0 standard atmosphere, 1-30 minutes are treated in pressure and temperature preservation;S3, the dyeing cavity is cooled and depressurized, then lens is taken out and cleaned.This process can improve dyeing efficiency and effect, the coloring depth of dyed lens can be up to 0.1mm or more, dyeing time is shortened, color is deepened, dyeing layer is more uniform, not easy to discolor, with wide market prospect.

Description

Technical Field

[0001] This invention relates to the field of lens dyeing technology, and in particular to a high-temperature pressure dyeing process for lenses. Background Technology

[0002] With the improvement of living standards, colored lenses are becoming increasingly popular. Regular lenses are colorless and transparent, while colored lenses are made by coloring regular lenses. The principle is that resin and nylon lenses can withstand high temperatures of 120-150℃. At temperatures of 80-100℃, the resin lens is heated, causing the intermolecular gaps to widen. Dye particles dissolved in water can then enter these gaps, causing the color. When the lens cools, the intermolecular gaps narrow, the color fixes, and the coloring process is complete.

[0003] Currently, domestic lens dyeing processes all employ a water bath heating dyeing technique under normal atmospheric pressure. This involves heating the dyeing solution to a specific temperature at one standard atmosphere before dyeing the lenses. This process typically only heats the water to a maximum of 100°C, controlling the temperature below 100°C to avoid defects such as lens vibration and scratches, uneven dyeing, and inaccurate dyeing caused by boiling water.

[0004] For example, patent application CN112895531B discloses a method for preparing a yellow-green night vision optical lens film, including the following steps:

[0005] (1) The PVA film is swollen at 30-31°C for 100-140 seconds. During the swelling process, the PVA film is stretched by 1.35-1.4 times.

[0006] (2) The swollen PVA membrane is washed with water at 30-31°C for 80-240 seconds. During the washing process, the PVA membrane is stretched by 1.01-1.05 times. The water used for washing is ultrapure water with a resistance ≥12MΩ and a pH of 7.

[0007] (3) The PVA film after washing is dyed at 45-47℃ for 115-120s. The dye is a composite dye composed of yellow and green dyes. The concentration of yellow dye is 2.92-3.0A and the concentration of green dye is 1.75-1.80A. During the dyeing process, the PVA film is stretched by 2.1-2.3 times.

[0008] (4) The dyed PVA film is fixed at 31-33°C for 50-70 seconds. The fixing agent is sodium chloride solution with a concentration of 0.5‰-1.5‰. During the fixing process, the PVA film is stretched by 0.95-1.05 times.

[0009] (5) The fixed PVA film is stretched at 45-47°C, and the stretching ratio is 1.7-1.9 times. During the stretching process, the structure of the PVA film is strengthened by boric acid solution, and the concentration of boric acid in the boric acid solution is 2.3%-2.6%.

[0010] (6) The reinforced PVA film is dried at 50-70°C, and then the dried PVA film is combined with the saponified TAC film; the combined film is dried again at 50-70°C and wound up to obtain the final product; wherein, the monomer transmittance of the optical lens film is 77%-78%; the polarization degree is 18.0%±1.0%, the L* value is 91±1, the a* value is -15.5±0.5, and the b* value is 25.5±0.5.

[0011] In the above scheme, the dyeing step is carried out at 45-47℃, followed by color fixing at 31-33℃, both under normal pressure. However, the coloring process is slow, making it difficult to improve production efficiency. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of existing lens dyeing processes and provide a pressurized high-temperature lens dyeing process. The inventors employ a unique process that departs from the conventional understanding of dyeing under normal pressure. By adjusting the pressure inside the dyeing container to 1.0–3.0 atmospheres, and controlling the dyeing temperature between 101–120 degrees Celsius, the resulting lenses exhibit excellent dyeing properties. This method is suitable for high-temperature resistant lenses before or after hardening, and the dye can be a conventional water-soluble pigment, making it widely applicable and possessing broad market prospects.

[0013] The specific plan is as follows:

[0014] A high-temperature pressure-increasing staining process for lenses includes the following steps:

[0015] S1, Prepare the staining solution and add it to the staining chamber;

[0016] S2, place the clean lens in the staining solution, seal and pressurize the staining chamber, and keep it heated and kept at a temperature of 101℃~120℃ and a pressure of 1.0~3.0 standard atmospheres for 1-30 minutes;

[0017] S3, the staining chamber is cooled and depressurized, and then the lens is removed for cleaning.

[0018] Furthermore, the dyeing solution described in S1 is an aqueous solution containing water-soluble dye.

[0019] Furthermore, the concentration of the water-soluble pigment in the dyeing solution in S1 is 0.1-30 wt%, preferably 1-15 wt%.

[0020] Furthermore, the clean lens mentioned in S2 is the lens before or after hardening treatment, and the lens can withstand 120°C without deformation.

[0021] Furthermore, in S2, a clamp for fixing the lens is provided inside the staining cavity.

[0022] Furthermore, the insulation temperature in S2 is 103–115°C, preferably 105–110°C.

[0023] Furthermore, the pressure for maintaining pressure in S2 is 1.5 to 2.5 standard atmospheres, preferably 1.5 to 2.0 standard atmospheres.

[0024] Furthermore, the heat preservation and pressure holding process described in S2 takes 5-25 minutes, preferably 5-15 minutes.

[0025] Furthermore, the cooling mentioned in S3 refers to the temperature dropping to 100°C or below, and the pressure reduction refers to the pressure dropping to 1.0 to 1.1 standard atmospheres.

[0026] Furthermore, the cleaning described in S3 is ultrasonic cleaning.

[0027] Beneficial effects: The high-temperature pressure dyeing process for lenses provided by this invention can improve the dyeing effect of lenses, reduce the dyeing defects of lenses, and avoid problems such as lens vibration scratches, uneven dyeing, and inaccurate dyeing caused by water vapor evaporation under normal pressure.

[0028] Furthermore, by adjusting the temperature of the dyeing solution and the pressure inside the dyeing container, the present invention enables the obtained lenses to have excellent dyeing properties, including shorter dyeing time, deeper color, increased dyeing depth, uniform dyeing layer, and less fading.

[0029] Furthermore, the high-temperature dyeing process for lenses provided by this invention can be flexibly applied to lenses before and after hardening. The lenses are required to be made of materials that can withstand heating to 120°C without deformation. It has a good dyeing effect on hardened lenses that are not easy to dye, and can solve the problem of difficult dyeing of hardened lenses.

[0030] In summary, this process can achieve excellent coloring effects on lenses of different materials, as well as lenses before and after hardening, and has broad application prospects. Detailed Implementation

[0031] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products. In the following embodiments, unless otherwise specified, "%" refers to weight percentage.

[0032] Comparative Example 1

[0033] A standard lens staining process includes the following steps:

[0034] S1. Prepare the dyeing solution. Use a resin lens dyeing kit (brand CHEACO) to prepare the dyeing solution. The water-soluble pigment content in the dyeing solution is 1 wt%.

[0035] S2, clean and dry the resin substrate, then place the clean lens on a fixture and immerse it in the staining solution. Heat the staining solution to 85°C under normal pressure and maintain the temperature for 20 minutes.

[0036] S3, Remove the lens for ultrasonic cleaning and drying.

[0037] The stained lenses obtained using the above method have a blue appearance. The entire process takes approximately 30 minutes per batch, with a staining depth of approximately 0.03-0.04 mm. The appearance of the stained lenses from different batches was checked, and samples with scratches or uneven staining were discarded. The average yield rate was 80%.

[0038] Comparative Example 2

[0039] The standard lens staining process includes the following steps:

[0040] S1. Prepare the dyeing solution. Use a resin lens dyeing kit (brand CHEACO) to prepare the dyeing solution. The water-soluble pigment content in the dyeing solution is 1 wt%.

[0041] S2. Clean and dry the resin substrate. Then place the clean lens on the fixture and immerse it in the hardening solution (8wt% titanium dioxide, 7wt% propylene glycol methyl ether, 9wt% antimony pentoxide, 2wt% silicon dioxide, 25wt% silane coupling agent, and the remainder being alcohol solvent) for 1 minute. After slow lifting, it is pre-cured at 60°C. After the lens is removed, it is post-cured at 125°C to obtain the hardened resin lens.

[0042] The hardened resin lens is immersed in the dyeing solution, and the dyeing solution is heated to 85°C under normal pressure and kept at that temperature for 20 minutes.

[0043] S3, Remove the lens for ultrasonic cleaning and drying.

[0044] The stained lenses obtained using the above method are nearly colorless with a slight bluish tint, indicating difficulty in coloring. The entire process takes approximately 60 minutes per batch. The appearance of the stained lenses from different batches was verified, and samples with scratches or uneven coloring were discarded. The average yield was 50%.

[0045] Example 1

[0046] A high-temperature pressure-increasing staining process for lenses includes the following steps:

[0047] S1. Prepare the staining solution. Use a resin lens staining kit (brand CHEACO) to prepare the staining solution. The water-soluble pigment content in the staining solution is 1wt%. Then add it to the staining chamber.

[0048] S2, the ordinary resin substrate is cleaned and dried, and then the clean lens is placed on the fixture and immersed in the staining solution. Next, the staining chamber is sealed, pressurized and heated, and kept at 101°C and 1.25 atmospheres for 8 minutes.

[0049] S3. Cool and depressurize the staining chamber. After the chamber is cooled to 99°C, depressurize it to normal pressure, remove the lens, and perform ultrasonic cleaning and drying.

[0050] The stained lenses obtained using the above method have a deep blue appearance. Compared to Comparative Example 1, the staining time is shortened, and the lens color is deepened, with a staining depth reaching over 0.1 mm. The increased staining depth results in a more uniform staining layer and reduces the likelihood of fading. The appearance of different batches of stained lenses was verified, and samples with scratches or uneven staining were discarded. The average yield rate was 85%.

[0051] Example 2

[0052] A high-temperature pressure-increasing staining process for lenses includes the following steps:

[0053] S1. Prepare the staining solution. Use a resin lens staining kit (brand CHEACO) to prepare the staining solution. The water-soluble pigment content in the staining solution is 2wt%. Then add it to the staining chamber.

[0054] S2, the ordinary resin substrate is cleaned and dried, and then the clean lens is placed on the fixture and immersed in the staining solution. Next, the staining chamber is sealed, pressurized and heated, and kept at 105°C and 1.5 atmospheres for 9 minutes.

[0055] S3. Cool and depressurize the staining chamber. After the chamber is cooled to 99°C, depressurize it to normal pressure, remove the lens, and perform ultrasonic cleaning and drying.

[0056] The stained lenses obtained using the above method have a deep blue appearance. Compared to Comparative Example 1, the staining time is shortened, and the lens color is deepened, with a staining depth reaching over 0.1 mm. The increased staining depth results in a more uniform staining layer and reduces the likelihood of fading. The appearance of different batches of stained lenses was verified, and samples with scratches or uneven staining were discarded. The average yield rate was 90%.

[0057] Example 3

[0058] A high-temperature pressure-increasing staining process for lenses includes the following steps:

[0059] S1. Prepare the staining solution. Use a resin lens staining kit (brand CHEACO) to prepare the staining solution. The water-soluble pigment content in the staining solution is 1wt%. Then add it to the staining chamber.

[0060] S2, the ordinary resin substrate is cleaned and dried, and then the clean lens is placed on the fixture and immersed in the staining solution. Next, the staining chamber is sealed, pressurized and heated, and kept at 120°C and 1.5 atmospheres for 10 minutes.

[0061] S3. Cool and depressurize the staining chamber. After the chamber is cooled to 99°C, depressurize it to normal pressure, remove the lens, and perform ultrasonic cleaning and drying.

[0062] The stained lenses obtained using the above method have a deep blue appearance. Compared to Comparative Example 1, the staining time is shortened, and the lens color is deepened, with a staining depth reaching over 0.1 mm. The increased staining depth results in a more uniform staining layer and reduces the likelihood of fading. The appearance of different batches of stained lenses was verified, and samples with scratches or uneven staining were discarded. The average yield rate was 90%.

[0063] Example 4

[0064] A high-temperature pressure-increasing staining process for lenses includes the following steps:

[0065] S1. Prepare the staining solution. Use a resin lens staining kit (brand CHEACO) to prepare the staining solution. The water-soluble pigment content in the staining solution is 1wt%. Then add it to the staining chamber.

[0066] S2. Clean and dry the resin substrate. Then place the clean lens on the fixture and immerse it in the hardening solution (8wt% titanium dioxide, 7wt% propylene glycol methyl ether, 9wt% antimony pentoxide, 2wt% silicon dioxide, 25wt% silane coupling agent, and the remainder being alcohol solvent) for 1 minute. After slow lifting, it is pre-cured at 60°C. After the lens is removed, it is post-cured at 125°C to obtain the hardened resin lens.

[0067] The hardened resin lens is placed on a clamp and immersed in the dyeing solution. The dyeing chamber is then sealed, pressurized, and heated, and maintained at 101°C and 1.25 atmospheres for 8 minutes.

[0068] S3. Cool and depressurize the staining chamber. After the chamber is cooled to 99°C, depressurize it to normal pressure, remove the lens, and perform ultrasonic cleaning and drying.

[0069] The stained lenses obtained using the above method have a deep blue appearance. Compared to Comparative Example 2, the staining time is shortened, and the lens color is deepened, with a staining depth reaching over 0.1 mm. The increased staining depth results in a more uniform staining layer and reduces the likelihood of fading. The appearance of different batches of stained lenses was verified, and samples with scratches or uneven staining were discarded. The average yield rate was 92%.

[0070] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0071] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0072] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A high-temperature pressure-increasing dyeing process for lenses, characterized in that: Includes the following steps: S1, Prepare the dyeing solution and add it to the dyeing chamber; the dyeing solution is an aqueous solution containing water-soluble pigment, prepared using a resin lens dyeing kit (CHEACO brand), and the concentration of the water-soluble pigment in the dyeing solution is 1 wt%. S2. Clean and dry the resin lens, then place the clean lens on a fixture and immerse it in a hardening solution. The hardening solution consists of: 8 wt% titanium dioxide, 7 wt% propylene glycol methyl ether, 9 wt% antimony pentoxide, 2 wt% silicon dioxide, 25 wt% silane coupling agent, and the remainder being an alcohol solvent. Soak for 1 minute, then slowly lift and pre-cur at 60°C. After the lens is removed, it is post-cured at 125°C to obtain a hardened resin lens. The hardened lens can withstand 120°C without deformation. Place the hardened resin lens on a fixture and immerse it in the dyeing solution. Then, seal and pressurize the dyeing chamber and heat it. Maintain the temperature and pressure at 101°C and 1.25 atmospheres for 8 minutes. S3, the dyeing chamber is cooled and depressurized, and then the lens is taken out for cleaning. The lens coloring depth is above 0.1mm, and the average yield rate is 92%.

2. The lens pressurization high-temperature dyeing process according to claim 1, characterized in that: The cooling mentioned in S3 refers to the temperature dropping to 100℃ or below, and the pressure reduction refers to the pressure dropping to 1.0 to 1.1 standard atmospheres.

3. The lens pressurization high-temperature dyeing process according to claim 2, characterized in that: The cleaning described in S3 is ultrasonic cleaning.