High-toughness colorful film as well as formula and manufacturing method of coating liquid of high-toughness colorful film

Abstract

The invention discloses a high-toughness colorful film and a formula and a manufacturing method of a coating liquid thereof, and the formula of the coating liquid comprises cholesteric liquid crystal epoxy resin, acetone, butyl glycidyl ether, a chiral dopant and triethylenetetramine. The invention aims to solve the problems of chemical corrosion resistance, flexibility and the like of an electroplated lens and easy cracking of an electroplated layer during large-angle bending, and provides an innovative formula of the coating liquid, and the coating liquid can be used for preparing a colorful film with high toughness and multi-angle color development. The colorful film is based on anisotropy of liquid crystal and based on the Bragg reflection principle, multiple layers are stacked to interfere with color development, all the beneficial effects of an electroplated lens can be met, and meanwhile the defects that an electroplated sheet is not resistant to chemical corrosion and insufficient in flexibility, and an electroplated layer is prone to cracking when bent at a large angle can be overcome; the flexible colorful film can provide a coiled material finished product, and the conditions of working procedure increase, production cost increase and resource waste caused by an electroplating process are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical materials, and particularly relates to a high-toughness colorful film and a formulation and manufacturing method of its coating solution. Background Art

[0002] At present, for TAC film spectacle lenses or other optical film spectacle lenses on the market, optical film materials are processed and then made into composite materials through a multi-layer composite technology. Then, these composite materials are cut into required small sizes and shaped into a specific curvature through a baking and bending process. After that, the formed lenses are sent for electroplating to obtain the required color effect. After electroplating, the lenses are trimmed to the size suitable for the spectacle frame. Finally, the trimmed lenses are assembled into the spectacle frame to complete the production of the spectacles.

[0003] The electroplating process is mainly divided into two types: wet electroplating and vacuum electroplating. The core purpose of both is to deposit a metal film on the surface of the lens to enhance the performance of the lens, protect the lens, and improve the appearance beauty. With the intensification of market competition and the diversification of demands, the design and processing technology of lenses have also undergone significant changes. Due to its characteristics, the electroplated layer is neither acid-alkali resistant nor scratch-resistant, which makes it extremely vulnerable to irreversible damage. This damage not only affects the wearing experience and appearance of the lens, but also the long-term wearing of damaged lenses may pose a threat to the eye health of users. In addition, the physical rigidity of the electroplated layer limits its application in the processing or design and development of new products involving large bending degrees, and it is easy to cause cracking of the electroplated layer. Summary of the Invention

[0004] The main purpose of the present invention is to provide a high-toughness colorful film and a formulation and manufacturing method of its coating solution, to solve the problems existing in the prior art, which can not only meet all the beneficial effects of electroplated lenses, but also make up for the shortcomings of electroplated lenses such as poor chemical corrosion resistance, insufficient flexibility, and easy cracking of the electroplated layer at large angles of bending.

[0005] To achieve the above object, one solution of the present invention is: A formulation of a coating solution, comprising cholesteric liquid crystal epoxy resin, acetone, butyl glycidyl ether, chiral dopant, and triethylenetetramine.

[0006] In the formulation, according to the requirement of the reflection wavelength, when adjusting the pitch, the ratio of one or both of acetone and butyl glycidyl ether to the chiral dopant is adjusted to achieve the adjustment of the concentration; the reflection wavelength The formula is 、 where represents the average refractive index of the liquid crystal, represents the ordinary refractive index, represents the extraordinary refractive index, represents the pitch, represents the angle between the incident light and the liquid crystal surface, represents the concentration of the chiral dopant, represents the helical twisting power.

[0007] Preferably, the specific mass ratio of the coating liquid formulation is as follows: 42% cholesteric liquid crystal epoxy resin, 33% acetone, 20% butyl glycidyl ether, 0.4% chiral dopant, 4.6% triethylenetetramine.

[0008] The chiral dopant is S811 dopant.

[0009] The second solution of the present invention is: A manufacturing method of a coating liquid, which is implemented in a constant temperature, constant pressure and dust-free environment of 23°C ± 1°C, and includes the following steps: Step 1: Place the cholesteric liquid crystal epoxy resin in a stirrer according to the formulation of the coating liquid, and rotate and stir it clockwise at a constant speed of 35 r / min; Step 2: Keep the rotation speed of the stirrer unchanged, add acetone and butyl glycidyl ether thereto, and continue stirring for 30 minutes; Step 3: Keep the rotation speed of the stirrer unchanged, add the chiral dopant thereto, and continue stirring for 30 minutes; Step 4: Keep the rotation speed of the stirrer unchanged, add triethylenetetramine thereto, continue stirring for 60 minutes until the liquid crystal phase is uniformly dispersed, and then stop the stirrer; finally, let it stand and evacuate the air to obtain the finished coating liquid.

[0010] The third solution of the present invention is: A high-toughness colorful film, including at least one substrate layer stacked, and a colorful coating obtained by spraying the coating liquid prepared according to the formulation of the coating liquid on the surface of the substrate layer by a nano-spraying process.

[0011] The substrate layer is a glass material, or at least one of plastic materials such as TAC, PC, PA, and PMMA.

[0012] The manufacturing method of the high-toughness colorful film includes the following steps: Step 1: Preset the startup parameters on the main control screen; Step 2: Set the distance between the nozzle and the substrate layer at 5 - 25 cm; Step 3: Prepare the coating liquid in advance according to the formulation of the coating liquid; Step 4: Inject the coating liquid into the material storage tank, quantitatively transport the coating liquid to the atomization surface through a metering pump to achieve ultrasonic atomization spray coating; the ultrasonic atomization frequency is 80 - 120 kHz, and the power is 50 - 200 W; Step 5: The spray-coated substrate enters an oven to achieve a fixed structure; the oven temperature is greater than 60°C and less than 245°C; the fixed structure time is not less than 24 hours; Step 6: Obtain at least one layer of the colorful coating layer superimposed on the surface of the substrate layer, and the total thickness of the colorful coating layer is 1 nm to 50 μm.

[0013] Preferably, when adjusting the color wavelength of the colorful coating, the color is changed by adjusting its pitch, and the adjustment of the pitch is achieved by adjusting at least one of the helical twisting force, the concentration of the chiral dopant, the average refractive index of the liquid crystal, and the temperature of the coating liquid.

[0014] After adopting the above technical solution, the present invention has the following technical effects: The present invention aims to solve the deficiencies of electroplated lenses in terms of chemical corrosion resistance and flexibility, as well as the problem that the electroplated layer is prone to cracking when bent at large angles. It provides an innovative coating liquid formula that can be used to prepare a colorful film with high toughness and multi-angle color display. The colorful film is based on the anisotropy of liquid crystal and utilizes the principle of Bragg reflection, with multi-layer superposition interference color display. It can not only meet all the beneficial effects of electroplated lenses, but also make up for the shortcomings of electroplated sheets such as chemical corrosion resistance, insufficient flexibility, and easy cracking of the electroplated layer when bent at large angles. The flexible colorful film can provide a finished roll product, which improves the situation of increased process steps, increased production costs and waste of resources caused by the electroplating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the layer structure of the third embodiment of the present invention.

[0016] Description of Figure Numbers: 1- Colorful coating; 2- Base material layer. DETAILED DESCRIPTION

[0017] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0018] The first embodiment of the present invention discloses a coating liquid formulation comprising the following components: a cholesteric liquid crystal epoxy resin (R / L), acetone (solvent), butyl glycidyl ether (solvent), a chiral dopant, and triethylenetetramine (aliphatic polyamine thermosetting curing agent). The mixture of acetone and butyl glycidyl ether allows for rapid viscosity adjustment and reduces curing defects. The R / L ratio represents the optical properties of the liquid crystal, with R representing right-handed and L representing left-handed.

[0019] Furthermore, in the formulation, the ratio of one or two of acetone and butyl glycidyl ether to the chiral dopant can be adjusted to achieve concentration adjustment according to the reflection wavelength requirement. The formula is , , where represents the average refractive index of the liquid crystal, represents the ordinary refractive index, represents the extraordinary refractive index, represents the pitch, represents the angle between the incident light and the liquid crystal surface, represents the concentration of the chiral dopant, represents the helical twisting power.

[0020] Furthermore, the mass ratio of the formulation is as follows: Cholesteric liquid crystal epoxy resin 42%, acetone 33%, butyl glycidyl ether 20%, chiral dopant 0.4%, triethylenetetramine 4.6%.

[0021] The above chiral dopant may be the S811 dopant.

[0022] The second embodiment of the present invention discloses a manufacturing method of a coating liquid, which is implemented in a constant temperature, constant pressure and dust-free environment of 23°C ± 1°C, and includes the following steps: Step 1: Place the cholesteric liquid crystal epoxy resin in a stirrer according to the above formulation, and rotate and stir it clockwise at a constant speed of 35 r / min; Step 2: Keep the rotation speed of the stirrer unchanged, add acetone and butyl glycidyl ether thereto, and continue stirring for 30 minutes; Step 3: Keep the rotation speed of the stirrer unchanged, add the chiral dopant thereto, and continue stirring for 30 minutes; Step 4: Keep the rotation speed of the stirrer unchanged, add triethylenetetramine thereto, continue stirring for 60 minutes, and then stop the stirrer until the liquid crystal phase is uniformly dispersed; finally, let it stand and evacuate the air to obtain the finished coating liquid.

[0023] The third embodiment of the present invention discloses a high-toughness colorful film, which uses a nano-spraying process, and its manufacturing method includes the following steps: Step 1: Preset the startup parameters on the main control screen; Step 2: Set the distance between the nozzle and the substrate layer 2 to be 5 - 25 cm, and the optimal distance is 21 cm; Step 3: Prepare the coating liquid in advance according to the above formulation; Step 4: Inject the coating liquid into the material storage tank, quantitatively transport the coating liquid to the atomization surface through a metering pump to achieve ultrasonic atomization spray coating; the ultrasonic atomization frequency is 80 - 120 kHz, preferably 120 kHz; the power is 50 - 200 W, preferably 150 W; Step 5: The spray-coated substrate enters an oven to achieve a fixed structure. The oven temperature can be set for a single oven or multiple ovens as needed, and the temperature setting must be greater than 60°C and less than 245°C. The fixed structure time is not less than 24 hours. Step 6: Obtain at least one layer of colorful coating 1 superimposed on the surface of the substrate layer 2 (refer to Figure 1 As shown in FIG, the total thickness of the colorful coating 1 is 1 nm to 50 μm. In actual production, the colorful coating 1 can be stacked in two, three, or even more layers.

[0024] Furthermore, the substrate layer 2 can be made of glass, or one or more plastic materials such as TAC, PC, PA, and PMMA. When the substrate layer comprises multiple materials, the various materials are stacked sequentially. When the substrate layer 2 is made of TAC, it must undergo an activation treatment to increase the film surface activity and enhance the bonding between the colorful coating 1 and the substrate layer 2.

[0025] At the same time, when adjusting the color wavelength of the colorful coating 1, the color is changed by adjusting its pitch, and the adjustment of the pitch is achieved by adjusting at least one of the spiral twisting force, the concentration of the chiral dopant, the average refractive index of the liquid crystal, and the temperature of the coating liquid.

[0026] Through the above scheme, the present invention aims to solve the deficiencies of electroplated lenses in terms of chemical corrosion resistance and flexibility, as well as the problem that the electroplated layer is prone to cracking when bent at large angles. It provides an innovative coating liquid formula, which can be used to prepare a colorful film with high toughness and multi-angle color display. The colorful film is based on the anisotropy of liquid crystal and utilizes the principle of Bragg reflection, with multi-layer superposition interference color display. It can not only meet all the beneficial effects of electroplated lenses, but also make up for the shortcomings of electroplated sheets such as chemical corrosion resistance, insufficient flexibility, and easy cracking of the electroplated layer when bent at large angles; the flexible colorful film can provide a finished roll product, which improves the situation of increased processes, increased production costs and waste of resources caused by the electroplating process.

[0027] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A formulation of a coating liquid, characterized in that include: Cholesteric liquid crystal epoxy resin, acetone, butyl glycidyl ether, chiral dopant and triethylenetetramine.

2. The coating liquid formulation according to claim 1, characterized in that: In the formulation, according to the requirements of the reflection wavelength, when adjusting the pitch, the ratio of one or both of acetone and butyl glycidyl ether to the chiral dopant is adjusted to achieve the adjustment of the concentration; the reflection wavelength is given by the formula , , where represents the average refractive index of the liquid crystal, represents the ordinary refractive index, represents the extraordinary refractive index, represents the pitch, represents the angle between the incident light and the liquid crystal surface, represents the concentration of the chiral dopant, represents the helical twisting power.

3. The formulation of the coating liquid according to claim 2, characterized in that The specific quality ratio is as follows: Cholesteric liquid crystal epoxy resin 42%, acetone 33%, butyl glycidyl ether 20%, chiral dopant 0.4%, triethylenetetramine 4.6%.

4. The coating liquid formulation according to claim 1, wherein: The chiral dopant is an S811 dopant.

5. A method for preparing a coating liquid, carried out in a constant temperature and pressure dust-free environment at 23°C ± 1°C, and comprising the following steps: Step 1: According to the coating liquid formulation of any one of claims 1 to 3, a cholesteric liquid crystal epoxy resin is placed in a stirrer and stirred in a clockwise rotation at a constant speed of 35 rpm; Step 2: adding acetone and butyl glycidyl ether while maintaining the stirrer speed, and continuing stirring for 30 minutes; Step 3: adding the chiral dopant while maintaining the stirrer speed constant, and continuing stirring for 30 minutes; Step 4: adding triethylenetetramine while maintaining the stirrer speed constant, and continuing stirring for 60 minutes until the liquid crystal phase is evenly dispersed, and then stopping the stirrer; finally, allowing the mixture to stand and evacuate the air in a vacuum to obtain a finished coating solution.

6. A high-toughness colorful film, characterized by: The invention comprises at least one stacked substrate layer, and a colorful coating obtained by spraying a coating liquid prepared by the coating liquid formula of any one of claims 1 to 4 onto the surface of the substrate layer through a nano-spraying process.

7. The high-toughness colorful film according to claim 6, wherein: The substrate layer is made of glass material or at least one of plastic materials such as TAC, PC, PA, and PMMA.

8. The high-toughness colorful film according to claim 6, wherein The method for manufacturing the high-toughness colorful film comprises the following steps: Step 1. Pre-set the startup parameters on the main control screen; Step 2: Set the distance between the nozzle and the substrate layer to 5-25 cm; Step 3: Pre-prepare the coating liquid according to the coating liquid formula; Step 4: inject the coating liquid into the material storage tank, and quantitatively deliver the coating liquid to the atomization surface through a metering pump to achieve ultrasonic atomization spray coating; the ultrasonic atomization frequency is 80~120kHz, and the power is 50~200W; Step 5: The spray-coated substrate enters an oven to achieve a fixed structure; the oven temperature is greater than 60°C and less than 245°C; the fixed structure time is not less than 24 hours; Step 6: Obtain at least one layer of the colorful coating layer superimposed on the surface of the substrate layer, and the total thickness of the colorful coating layer is 1 nm to 50 μm.

9. The high-toughness colorful film according to claim 7, wherein: When adjusting the color wavelength of the colorful coating, the color is changed by adjusting its pitch, and the pitch is adjusted by adjusting at least one of the helical twisting force, the concentration of the chiral dopant, the average refractive index of the liquid crystal, and the temperature of the coating liquid.

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