Search

CN-122018180-A - Photochromic dye grafted nanoparticle composite film layer photochromic lens and preparation method thereof

CN122018180ACN 122018180 ACN122018180 ACN 122018180ACN-122018180-A

Abstract

The invention relates to a photochromic dye grafted nanoparticle composite film layer photochromic lens and a preparation method thereof, and belongs to the technical field of optical lenses. The photochromic lens comprises a lens substrate, a bottom coating, a photochromic dye grafted nanoparticle composite film layer and a protective layer which are sequentially stacked from bottom to top, wherein the photochromic dye is grafted with the surface of the gold/silver nanoparticle through a mercapto group or a carboxyl group at the molecular end of the photochromic dye. The covalent grafting structure and the local surface plasma resonance effect of the nano particles cooperatively solve the bottlenecks of easy aggregation of dye, low loading capacity and slow response in the traditional technology. The invention has the characteristics of extremely fast color changing response, high color changing efficiency, high mechanical strength, good environmental stability and the like, and obviously improves the comprehensive performance and service life of the color changing lens.

Inventors

  • Qin yuhuan
  • WANG BIN
  • HE JIANYOU

Assignees

  • 上海康耐特光学有限公司
  • 江苏康耐特光学有限公司

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. The photochromic dye grafted nanoparticle composite film layer photochromic lens is characterized by comprising a lens substrate, an undercoat layer, a photochromic dye grafted nanoparticle composite film layer and a protective layer which are sequentially stacked from bottom to top; wherein, the photochromic dye forms chemical bond grafting with the surface of the nano particle through the sulfydryl or carboxyl at the molecular terminal.
  2. 2. The photochromic dye grafted nanoparticle composite film layer color-changing lens according to claim 1, wherein the photochromic dye is one or two of spiropyran dye and spirooxazine dye subjected to sulfhydryl or carboxylation treatment.
  3. 3. The photochromic dye-grafted nanoparticle composite film color-changing lens of claim 1 wherein the nanoparticles are one or both of gold nanoparticles or silver nanoparticles.
  4. 4. The photochromic dye grafted nanoparticle composite film layer photochromic lens of claim 1, wherein the lens substrate is one of polycarbonate, carboacrylic acid-acrylic acid or polyurethane, and has a thickness of 1.2-2.0 mm.
  5. 5. The photochromic dye grafted nanoparticle composite film layer photochromic lens of claim 1, wherein the coating of the base coat is prepared by mixing polyurethane and a silane coupling agent according to a mass ratio of 99:1, and the thickness of the base coat is 0.5-1.5 μm.
  6. 6. The photochromic dye grafted nanoparticle composite membrane layer color-changing lens according to claim 1 is characterized in that the formula of the photochromic dye grafted nanoparticle composite membrane layer coating liquid comprises, by weight, 5-15 parts of a photochromic dye grafted nanoparticle solution, 20-40 parts of polyether polyol, 15-35 parts of isocyanate, 0.1-1 part of a catalyst and 25-45 parts of a solvent; Wherein the photochromic dye grafted nanoparticle solution contains 0.5-1.5 wt% of nanoparticles; The polyether polyol is one or more of polytetrahydrofuran ether glycol (PTMEG), propylene glycol polyether, trimethylolpropane polyether and ethylene glycol Polyether (PEG); The isocyanate is one or more of Toluene Diisocyanate (TDI), dicyclohexylmethane diisocyanate (HMDI) and diphenylmethane diisocyanate (MDI); the catalyst is one or more of dibutyl tin dilaurate, dimethylaminoethyl ether, pentamethyl diethylenetriamine and stannous octoate; The solvent is one or more of dimethylformamide, methyl pyrrolidone, cyclohexanone and propylene glycol methyl ether; the thickness of the photochromic dye grafted nanoparticle composite film layer is 5-20 mu m.
  7. 7. The photochromic dye grafted nanoparticle composite membrane layer color-changing lens according to claim 1, wherein the preparation process of the photochromic dye grafted nanoparticle composite membrane layer coating liquid is characterized in that raw materials in a composite membrane layer coating liquid formula are stirred and mixed at 50 ℃ for 1h, then vacuum defoamation is carried out for 30min, and the viscosity of the coating liquid is controlled at 500-800 mPa.s, so that the composite membrane layer coating liquid is obtained.
  8. 8. The photochromic dye grafted nanoparticle composite membrane layer photochromic lens of claim 1, wherein the protective layer is made of polyurethane acrylate, and the thickness of the protective layer is 15-25 μm.
  9. 9. A method for preparing a photochromic dye grafted nanoparticle composite film layer photochromic lens according to any one of claims 1-8, which is characterized by comprising the following specific steps of, S9-1, preparing an undercoating layer, namely pretreating a lens substrate, coating the surface of the pretreated lens substrate with an undercoating layer coating through a dip-coating process, and curing for 1-3 hours at 110-130 ℃ to obtain the undercoating layer; s9-2, preparing a photochromic dye grafted gold nanoparticle composite membrane layer, namely coating a composite membrane layer coating solution on the surface of an undercoat layer through a spin coating process, wherein the spin coating rotating speed is 1500-2500 rpm, the time is 20-40S, and the photochromic dye grafted gold nanoparticle composite membrane layer is obtained through heat curing for 30-180 min at 95-135 ℃; S9-3, preparing a protective layer, namely coating polyurethane acrylic ester on the surface of the photochromic dye grafted gold nanoparticle composite film layer, and carrying out UV curing for 2-5S with the power of 400-600 mW/cm 2 to obtain the protective layer.
  10. 10. The method for preparing a photochromic dye grafted nanoparticle composite membrane layer photochromic lens according to claim 9, wherein the pretreatment step is alkaline washing or plasma treatment; The method comprises the steps of performing alkaline washing pretreatment, namely placing a lens substrate in a sodium hydroxide solution with the mass fraction of 20% -30% for ultrasonic washing for 5-20 min, wherein the ultrasonic power is 20-90W, the ultrasonic frequency is 30-80 kHz, then performing deionized water washing and drying to obtain the pretreated lens substrate, and placing the substrate in a plasma processor for 3-10 min, wherein the plasma power is 50-150W to obtain the pretreated lens substrate.

Description

Photochromic dye grafted nanoparticle composite film layer photochromic lens and preparation method thereof Technical Field The invention belongs to the technical field of optical lenses, and relates to a photochromic dye grafted nanoparticle composite film layer photochromic lens and a preparation method thereof. Background Photochromic lenses provide visual comfort and protection to the user by changing the light transmittance under light conditions. Currently, the mainstream technical paths for realizing the photochromic function of the lens include a substrate doping method, a surface coating method and a nano-composite technology developed on the basis of the substrate doping method and the surface coating method, but the methods still have certain limitations. The substrate doping method is to disperse spiropyran and spirooxazine photochromic dye directly in resin monomer to form homogeneous color changing substrate through polymerization. Chinese patent CN 116224622B improves overall performance by constructing a bilayer structure of the substrate and the coating. However, this method has inherent bottlenecks such as difficulty in precisely controlling the dispersion uniformity of the dye in the polymer network, insufficient color-changing depth, limited difference in indoor and outdoor light transmittance, and poor compatibility of the dye with the high refractive index resin, which is liable to cause unstable performance or material defects. The surface coating method generally adopts a film transformation technology (such as a full line of sight Trans-bondingTM technology), coats a coating containing photochromic dye on the surface of a lens substrate, and cures the coating into a film through a cross-linking agent such as isocyanate, for example, chinese patent CN 115521495A, and has the challenges that the combination between the coating and the substrate depends on physical adsorption or limited chemical bonding, the adhesion is insufficient, the coating is easy to peel off under mechanical friction or severe environment, the thickness of the coating is often required to be increased (usually more than or equal to 5 mu m) in order to obtain a sufficient color change effect, but the optical quality and mechanical property of the lens can be influenced, and in addition, the dye in the coating is directly exposed to the environment, and is easy to undergo photo-chemical degradation under high temperature or ultraviolet long-term irradiation, so that the durability is reduced. Researchers have explored the incorporation of nanomaterials into color-changing systems. However, most of the nano particles and dye molecules in the nano composite technology are simply and physically blended, and the nano particles and dye molecules lack stable chemical connection, so that the nano particles are easy to agglomerate in the long-term use process, the performance cannot be effectively enhanced, the isomerization process of the dye molecules is possibly hindered, and the color-changing response speed is slow. In summary, the existing photochromic lens mainly realizes the color change function through substrate doping or surface coating, but has the technical bottlenecks that the adhesion between the photochromic dye and the substrate in the traditional coating technology is insufficient, the photochromic dye is easy to fall off after long-term use, the color change depth is insufficient, the dye concentration is limited, the indoor and outdoor light transmittance difference is limited, the color change response speed is slower, the performance attenuation is obvious especially on the substrate with high refractive index, the durability is poor, the coating is easy to be influenced by the environmental temperature and humidity, and the performance is attenuated after long-term use. The single coating structure results in a difficult compromise between color depth and fade rate. Therefore, development of a photochromic lens composite film layer with strong binding force, high response speed, good environmental adaptability and lasting performance and a preparation method thereof are needed. Disclosure of Invention The invention aims to provide a photochromic dye grafted nanoparticle composite membrane layer photochromic lens and a preparation method thereof, wherein the photochromic dye is covalently grafted on the surface of gold or silver nanoparticles through sulfydryl or carboxyl, so that a composite functional unit with a stable structure is constructed, and the bottleneck of the traditional photochromic lens in terms of performance and environmental adaptability is fundamentally solved. The photochromic dye grafted nanoparticle composite film layer photochromic lens comprises a lens substrate, an undercoat layer, a photochromic dye grafted nanoparticle composite film layer and a protective layer which are sequentially stacked from bottom to top; wherein, the photochromic dye forms chemical bond grafting wi