WO2022174514A1

WO2022174514A1 - Sunglasses lens hardening liquid and preparation method for lens using said hardening liquid

Info

Publication number: WO2022174514A1
Application number: PCT/CN2021/088376
Authority: WO
Inventors: 肖泽渝; 黄惠峰; 谢飞; 黄久清; 唐统添
Original assignee: 深圳市晶联星科技有限公司
Priority date: 2021-02-20
Filing date: 2021-04-20
Publication date: 2022-08-25
Also published as: CN112939481A

Abstract

A sunglasses lens hardening liquid and a preparation method for a lens using the hardening liquid. The hardening liquid comprises the following components in percent by weight: 30% an organic silicone resin, 30% ethanol, 20% isopropanol, 10% acetic acid, and 10% water. The preparation method for a lens using said hardening liquid is: placing a lens into a sodium hydroxide solution and soaking; then placing then lens in pure water and washing clean; subsequently, placing the lens in a liquid state monohydric alcohol having 3 or fewer carbon atoms and soaking, taking the lens out, and drying by means of evaporation to remove water; then placing the lens in the hardening liquid and lifting out at a uniform speed, causing the hardening liquid to achieve a leveling effect and form a coating on a surface of the lens; and last, baking the lens, causing the coating and the lens to combine and form a hardened film layer, and thus obtaining a coated lens.

Description

Sunglass lens hardening liquid and preparation method of lens using the hardening liquid

technical field

The present application relates to the field of optical lens hardening materials, and more particularly, it relates to a sunglass lens hardening solution and a preparation method of a lens using the hardening solution.

Background technique

Traditional sun lenses are mostly glass lenses and resin lenses. Glass lenses are gradually eliminated because they are relatively heavy and fragile. Compared with glass lenses, resin lenses are light in weight, strong in impact resistance, not easy to break, good in light transmission, and transparent. The light rate can reach 84-90%, so it is more popular with consumers, and the manufacturing process of the resin lens is far less difficult than that of the glass lens, and the manufacturing cost is low.

With the improvement of people's requirements for the quality of sun lenses, Eastman has developed a copolyester Tritan. The light transmittance of Tritan material is higher than that of ordinary resins, the light transmittance is as high as 91%, the haze is less than 1%, and the The impact strength is excellent, comparable to PC resin, and the processing difficulty is low, so the application of Tritan material in sunglass lenses is gradually popularized.

However, Sunglasses made of Tritan and ordinary resin sunglasses have a common disadvantage: poor wear resistance, and the surface of the lens is easy to be scratched. Therefore, a layer of hard coating is usually coated on the surface of the sunglass to improve the wear resistance of the lens, so that the sunglass can well resist the damage of hard objects and prolong the life of the sunglass. At present, solar lenses are mostly hardened with silicon atoms. Through the hardening liquid containing organic matrix and inorganic ultra-fine particles including silicon elements, the hard film has both toughness and hardness.

However, lenses of different materials have different adhesion to the hardening fluid. When the hardening fluid has poor adhesion to the lens, the firmness of the hard coating layer will be poor, and the phenomenon of separation of the hard coating layer will occur. At present, the hardening fluid on the market will Most of them are suitable for ordinary resin sunglasses, and it is difficult to apply to the sun lenses made of Tritan.

SUMMARY OF THE INVENTION

In order to improve the problem that the hardening liquid on the market is difficult to apply to lenses made of Tritan material, the present application provides a hardening liquid for sunglasses lenses and a method for preparing a lens using the hardening liquid.

In a first aspect, the present application provides a sunglass lens hardening solution, which includes the following components: silicone resin, ethanol, isopropanol, acetic acid, and water.

In some specific embodiments, a sunglass lens hardening solution is provided, comprising the following components by weight:

Silicone resin 25-45%;

Ethanol 25-35%;

Isopropyl alcohol 15-25%;

Acetic acid 5-15%;

Water 5-15%.

In further specific embodiments, the following components by weight are included:

Silicone resin 30%;

Ethanol 30%;

Isopropyl alcohol 20%;

Acetic acid 10%;

Water 10%.

The hardening liquid prepared by using the above formula has good adhesion between the lens made of Tritan material, the formed reinforced film layer can be firmly connected with the lens, and is not easy to fall off, and the hard film layer has excellent wear resistance, resistance to Scratch performance, hardness, impact strength, high and low temperature resistance, aging resistance and corrosion resistance, can effectively protect the lens, in addition, the light transmittance of the hard coating layer is as high as 94.6%, and the haze is 0.7%, with excellent The light transmittance is good, and the optical performance is good and can be well matched with the Tritan material lens, which will not affect the wearer's vision.

In the second aspect, the present application provides a method for preparing a lens using the above-mentioned hardening liquid, which adopts the following technical solutions:

A method for preparing a lens, comprising the following steps:

Activation: soak the lens in sodium hydroxide solution;

Cleaning: Wash the lenses soaked in sodium hydroxide solution in pure water;

Water removal: soak the cleaned lens in a liquid monohydric alcohol with less than 3 carbon atoms, take out the lens after soaking, and evaporate the residual isopropyl alcohol on the lens to dry;

Coating: Put the lens into the hardening solution, and pull it at a uniform speed to make the hardening solution achieve a leveling effect on the surface of the lens to form a coating;

Baking: Baking the lens to organically combine the coating with the lens to form a hard coat layer to obtain a coated lens.

By adopting the above preparation method and soaking the lens with sodium hydroxide solution, the impurities on the lens surface can be pre-separated from the lens, thereby reducing the adhesion between the impurities and the lens surface, thereby reducing the difficulty of subsequent lens cleaning, which is conducive to improving the quality of the lens. The effect of cleaning, in addition, soaking in sodium hydroxide solution can also improve the activity of the surface of the lens, so that the subsequent lens and the hardening solution can be better attached, which is conducive to improving the firmness between the hard coat layer and the lens. The cleaning step is used for Remove impurities on the surface of the lens to avoid affecting the subsequent coating. The water removal step is used to remove the moisture on the surface of the lens, so as to prevent the residual moisture from affecting the adhesion of the hardening solution and the lens, and reduce the loosening and separation of the hard coat layer and the lens. possibility.

Preferably, the concentration of the sodium hydroxide solution is 5%, and the soaking time is 5min.

After testing, the sodium hydroxide solution of this concentration can well reduce the adhesion between impurities and the lens, and can also effectively improve the activity of the surface of the lens, and can also avoid the corrosion of the lens caused by the high concentration of sodium hydroxide solution. .

Preferably, the temperature of the sodium hydroxide solution in the activation step is controlled at 50°C.

Tests show that the treatment effect of sodium hydroxide solution on the lens surface can be improved at 50°C, which is beneficial to improve the activity of the lens surface and facilitate the subsequent cleaning and coating steps.

Preferably, isopropyl alcohol is used to soak the lens in the water removal step.

After testing, isopropyl alcohol has better removal effect on water.

Preferably, in the baking step, the baking temperature is 95° C., and the baking time is 3 hours.

After testing, baking at 95 °C for 3 hours can not only ensure the hardening of the coating to form a hardened film, but also avoid damage to the hardened film caused by excessively high temperature or long baking time. higher production efficiency.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. There is good adhesion between the hardening liquid prepared by the formula of the present application and the lens made of Tritan material, the formed reinforced film layer can be firmly connected with the lens, and is not easy to fall off, and the hard film layer has excellent wear resistance. , scratch resistance, hardness, impact strength, high and low temperature resistance, aging resistance and corrosion resistance, can effectively protect the sun lens, in addition, the light transmittance of the hard coating layer is as high as 94.6%, and the haze is 0.7%. , has excellent light transmittance, good optical performance and can be well matched with Tritan material lenses, and will not affect the wearer's vision.

2. The application uses sodium hydroxide solution to soak the lens to pre-separate the impurities on the surface of the lens from the lens, which reduces the adhesion between the impurities and the surface of the lens, thereby reducing the difficulty of subsequent lens cleaning, which is conducive to improving the cleaning of the lens. In addition, soaking in sodium hydroxide solution can also improve the activity of the surface of the lens, so that the subsequent lens and the hardening solution can be better attached, which is conducive to improving the firmness between the hard coating layer and the lens. The cleaning step is used to remove The impurities on the surface of the lens can avoid affecting the subsequent coating. The water removal step is used to remove the moisture on the surface of the lens, so as to avoid the residual moisture from affecting the adhesion of the hardening solution and the lens, and reduce the possibility of loosening and separation of the hard coat layer and the lens. sex.

3. The sodium hydroxide solution is controlled at 50°C to improve the treatment effect of the sodium hydroxide solution on the lens surface, which is beneficial to improve the activity of the lens surface and facilitate the subsequent cleaning and coating steps.

Detailed ways

Traditional sun lenses are mostly glass lenses and resin lenses. Glass lenses are gradually eliminated because they are relatively heavy and fragile. Compared with glass lenses, resin lenses are light in weight, strong in impact resistance, not easy to break, and have good light transmittance. Therefore, The penetration rate is higher. With the improvement of people's requirements for the quality of sunglasses, Eastman has developed a copolyester Tritan. The light transmittance of Tritan is higher than that of ordinary resins, and its impact strength is excellent, which is comparable to PC resins. The processing difficulty is low, so the application of Tritan material in sunglass lenses is gradually popularized.

However, Sunglasses made of Tritan and ordinary resin sunglasses have a common disadvantage: poor wear resistance, and the surface of the lens is easy to be scratched. Therefore, a hard coating is usually coated on the surface of the sun lens to improve the wear resistance of the lens. At present, the sun lens is mostly hardened with silicon atoms. liquid, so that the hard coating has both toughness and hardness. However, lenses of different materials have different adhesion to the hardening fluid. When the hardening fluid has poor adhesion to the lens, the firmness of the hard coating layer will be poor, and the phenomenon of separation of the hard coating layer will occur. At present, the hardening fluid on the market will Most of them are suitable for ordinary resin sunglasses, and it is difficult to apply to the sun lenses made of Tritan.

The present application has developed a hardening solution, which can be well applied to the sun lenses made of Tritan.

In order to make it easier to understand the technical solutions of the present application, the present application will be described in further detail below with reference to the tables, drawings and examples, but it is not regarded as the protection scope limited by the present application.

Example

Example 1

A sunglass lens hardening liquid, comprising the following components by weight:

Silicone Resin 25%

Ethanol 35%

Isopropyl Alcohol 20%

Acetic acid 10%

Water 10%.

Applying the hardener to the lens involves the following steps:

Activation: soak the lens in 5% sodium hydroxide solution at 50°C for 5min;

Cleaning: After activation, place the lens in an ultrasonic cleaner and clean it with pure water;

Water removal: soak the cleaned lens in isopropyl alcohol, take out the lens after soaking, and let the residual isopropyl alcohol on the lens evaporate to dryness;

Coating: The lens after dewatering is completely immersed in the hardening liquid, and the uniform speed is pulled to make the hardening liquid achieve a leveling effect on the surface of the lens to form a coating;

Baking: Put the coated lens into an oven and bake at 95°C for 3 hours to organically combine the coating and the lens to form a hard coat layer to obtain a coated lens.

Example 2

The difference from Example 1 is that the weight percent ratio of each component of the sunglass lens hardening solution is as follows:

Silicone Resin 30%

Ethanol 30%

Isopropyl Alcohol 20%

Acetic acid 10%

Water 10%.

Example 3

Silicone Resin 45%

Ethanol 25%

Isopropyl Alcohol 20%

Acetic acid 5%

Water 5%.

Comparative ratio

Comparative Example 1

The difference from Example 1 is that no activation step is performed.

performance test

The following performance testing tests were performed on the coated sunglass lenses prepared in Example 1 and Example 2, respectively. For each performance testing test, 5 coated sunglass lenses prepared in Example 1 and Example 2 were used for testing. The results are averaged.

Surface hardness test: take a 3H pencil (the top of the pencil is rounded and ground) at 45° to the outer surface of the lens, and push the pencil to stroke at different positions on the outer surface of the lens, with a pressure of 500g.

Eraser abrasion test: Use an eraser to rub the outer surface of the lens at ±2mm, the pressure is 5±1N, the friction length is 30±5mm, test standard: GB 10810.5-2012, test equipment: friction tester.

Cheesecloth abrasion resistance test: Put the lens on a white cloth and press and rub it back and forth for 30 times. Test standard: ISO 8980-5:2005(e), test tool: glasses cloth.

Steel wool abrasion resistance test: use steel wool to rub back and forth on the outer surface of the lens for 300 times, the pressure is 300g, the steel wool friction surface is flat and the plane size is larger than the diameter of the die, the new steel wool friction surface should be run in once, the test standard : GB 10810.5-2012, test equipment: friction tester.

100 grid test: Use a blade to cut 10 parallel lines in the horizontal and vertical directions of the lens, and the distance between each parallel line is 1mm to form 100 small squares, sweep the grid area with a soft brush, and stick it with transparent tape. Put it on the grid area and flatten it so that the tape is in good contact with the film layer. Quickly tear off the tape at an angle close to 90° upward, and check whether the film layer is peeled off on the tape and the lens. Test standard: ISO R1514, ISO 2808.

Low temperature test: put the lens in the refrigerator at -18℃±3℃ for 2h, then take it out and place it at room temperature for 30min, check the surface appearance, test standard: GB 10810.4-2012, test equipment: constant temperature and humidity testing machine.

High temperature test: put the lens in an oven at 55℃±2℃ for 2h, then take it out and place it at room temperature for 30min, check the surface appearance, test standard: GB 10810.4-2012, test equipment: constant temperature and humidity testing machine.

Salt water test: Dissolve 45g of sodium chloride in 1L of pure water and stir to dissolve, immerse the lens in salt water and keep it at 37℃±2℃ for 7h, take out the sample, wash it with pure water and dry it with a soft clean cloth After checking the appearance, test standard: GB 10810.4-2012, test equipment: constant temperature and humidity testing machine.

High temperature water resistance test: boil 5% salt water to 90℃, put the lens into the lens and cook for 30min, wash it with pure water and dry it with a soft clean cloth to check the appearance, test equipment: constant temperature water bath.

QUV accelerated aging test: irradiance 0.78J/㎡, test at 60℃ for 4h, 4h at 70℃, alternate cycle test for 25h, test standard: GB/T16422, ASTM G154, test equipment: QUV accelerated aging test machine.

Drop ball test: use a steel ball weighing 16g to fall freely against the lens at a height of 1.27m, repeat 3 times, test standard: ISO 12312-1/ANSI Z80.3/AS NZS1067.1/FDA, test equipment: drop tester .

Light transmittance test: Test standard: ISO 12312-1\ANSI Z80.3\AS NZS1067.1, test equipment: light transmittance tester.

Haze test: Test standard: ISO 12312-1\ANSI Z80.3\AS NZS1067.1, test equipment: haze measuring instrument.

Spherical degree astigmatism test: Test standard: ISO 12312-1\ANSI Z80.3\AS NZS1067.1, test equipment: focimeter.

The data of the above performance testing test are shown in Table 1.

Table 1: Performance testing test data

Combined with the data of Examples 1-3 and Table 1, the reinforced film layer prepared in Example 1-3 has good adhesion to the sunglass made of Tritan material, can be firmly connected with the lens, is not easy to fall off, and The reinforced film layer has excellent wear resistance, hardness, impact strength, high and low temperature resistance, aging resistance and corrosion resistance, light transmittance can reach 94.6%, haze can reach 0.7%, with excellent light transmittance . However, the reinforced film layers prepared in Example 1 and Example 3 will have a very small amount of non-visual scratches in the surface hardness test, but they can reach the product qualification standard, while the reinforced film layer prepared in Example 2 is in No scratches appeared in the surface hardness test, and it can be seen that the ratio of the hardening liquid in Example 2 is better.

Combined with the data in Example 1, Comparative Example 1 and Table 1, the reinforced film layer prepared in Comparative Example 1 and the Sunglasses made of Tritan will be tested in high/low temperature test, salt water test, high temperature water resistance test and QUV accelerated aging test. A small amount of wrinkling and demoulding appeared, indicating that the adhesion between the reinforced film layer prepared in Comparative Example 1 and the sunglass made of Tritan material was worse than that in Example 1, and it can be concluded that sodium hydroxide solution was used to soak the lens. The activation step is beneficial to the better adhesion of the lens and the hardening solution, and is beneficial to improve the firmness between the hard coating layer and the lens, and the reinforced coating layer is not easy to fall off during use.

However, the reinforced film layer prepared in Comparative Example 1 is basically the same as the reinforced film layer prepared in Example 1 in terms of wear resistance, hardness and impact strength, and the test results are not unqualified. Therefore, it can be seen that the hardening solution formulated in the present application The prepared reinforced film layer has excellent wear resistance, hardness and impact strength, and can effectively protect the lens.

This specific embodiment is only an explanation of the application, and it does not limit the application. Those skilled in the art can make modifications to the embodiment without creative contribution as needed after reading this specification, but as long as the rights of the application are All claims are protected by patent law.

Claims

A sunglass lens hardening solution, characterized in that it comprises the following components by weight:

Silicone resin 30%;

Ethanol 30%;

Isopropyl alcohol 20%;

Acetic acid 10%;

Water 10%.
The preparation method of the lens that is applied with the sunglass lens hardening liquid of claim 1, is characterized in that, comprises the following steps:

Activation: soak the lens in sodium hydroxide solution;

Cleaning: Wash the lenses soaked in sodium hydroxide solution in pure water;

Water removal: soak the cleaned lens in a liquid monohydric alcohol with less than 3 carbon atoms, take out the lens after soaking, and evaporate the residual isopropyl alcohol on the lens to dry;

Coating: Put the lens into the hardening solution, and pull it at a uniform speed to make the hardening solution achieve a leveling effect on the surface of the lens to form a coating;

Baking: Baking the lens to organically combine the coating with the lens to form a hard coat layer to obtain a coated lens.
The method for preparing a lens according to claim 2, wherein the concentration of the sodium hydroxide solution is 5%, and the soaking time is 5min.
The method for preparing a lens according to claim 2, wherein the temperature of the sodium hydroxide solution in the activation step is controlled at 50°C.
The preparation method of lens according to claim 2, is characterized in that: in the step of removing water, isopropyl alcohol is used to soak the lens.
The method for preparing a lens according to claim 2, wherein in the baking step, the baking temperature is 95°C, and the baking time is 3 hours.
A sunglass lens hardening solution, characterized in that, comprises the following components by weight:

Silicone resin 25-45%;

Ethanol 25-35%;

Isopropyl alcohol 15-25%;

Acetic acid 5-15%;

Water 5-15%.