CN112895531B

CN112895531B - Preparation method of yellow-green night vision optical lens film

Info

Publication number: CN112895531B
Application number: CN202011632006.2A
Authority: CN
Inventors: 田巧云; 许春江; 朱虹; 李建红
Original assignee: Nanjing Hanqi New Materials Co ltd
Current assignee: Nanjing Hanqi New Materials Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2023-04-11
Anticipated expiration: 2040-12-31
Also published as: CN112895531A

Abstract

The invention relates to a preparation method of a yellow-green night vision optical lens film, which comprises the steps of sequentially carrying out swelling, washing, dyeing, color fixing, extending, drying, compounding and drying again on a polyvinyl alcohol (PVA) film to obtain the yellow-green night vision optical lens film. The yellow-green night vision optical lens film prepared by the method has the advantages that the monomer transmittance of the optical lens film is 77-78%, the polarization degree is 18.0% +/-1.0%, and the blue light transmittance ratio is high and can reach more than 0.7; not only can use also can be used for night daytime, especially when it is used for night time, when preventing the distance light, also can not cause visual fatigue, satisfy simultaneously the european standard LED signal lamp blue light and see through and be greater than 0.6, and the requirement that the australian standard LED signal lamp blue light is greater than 0.7 is passed through to australia standard LED signal lamp blue light.

Description

Preparation method of yellow-green night vision optical lens film

Technical Field

The invention belongs to the technical field of optical resin lens films, and particularly relates to a preparation method of a yellow-green night vision optical lens film.

Background

With the increase of income per capita as society progresses, most families buy automobiles, but the accompanying problems are increasingly prominent, especially light pollution. Although the society advocates civilized driving and reasonably uses the automobile lights in the traffic rules, the non-civilized driving behavior that some drivers abuse the high beam is not excluded, so the glasses capable of preventing the high beam are produced.

The glasses capable of preventing high beam in the current market can be divided into two types, one type is gray or black polarizer; the other is yellow night vision goggles. Both of these glasses have their own drawbacks, the gray or black polarizers cannot be used at night because they will completely weaken the light in the visible range, which is likely to cause invisible or unclear observation and cause traffic accidents; while the yellow glasses brighten the light within the visual range, and increase the night brightness beside the light to play the role of preventing distance light, but the yellow distance light-proof glasses have the disadvantage of easily causing visual fatigue to cause traffic accidents, because the glasses strengthen the brightness of the light, the eyes of people are stimulated for a long time under the strong light to easily cause visual fatigue to cause eye discomfort, and the glasses also have the defect that the transmittance requirements of export standards, particularly European and Australian LED signal lamps, cannot be met.

Therefore, it is necessary to prepare an optical lens film that can prevent high beam and meet the exit standard, and it is also in line with the needs of people.

Disclosure of Invention

The invention aims to provide a preparation method of a yellow-green night vision optical lens film on the basis of the prior art. The optical lens film prepared by the method has high blue light transmission ratio which can reach more than 0.7; the multifunctional glasses can be used not only in the day but also at night, and particularly when used at night, can prevent high beam and cannot cause visual fatigue.

The technical scheme of the invention is as follows:

the invention provides a preparation method of a yellow-green night vision optical lens film, which comprises the following steps: the polyvinyl alcohol (PVA) film is sequentially subjected to swelling, washing, dyeing, color fixing, extending, drying, compounding and drying again to obtain the LED traffic signal lamp blue light transmission and night-vision optical lens film meeting European standards, australian standards and American standards.

In a preferred embodiment, the invention provides a method for preparing a yellow-green night vision optical lens film, which comprises the following more detailed steps:

(1) Swelling the PVA film at 29-32 ℃ for 60-200s, and extending the PVA film in the swelling process, wherein the extension multiplying power is 1.3-1.5 times;

(2) Washing the swelled PVA film with water at 29-32 ℃ for 60-300s, and extending the PVA film in the washing process, wherein the extension multiplying power is 1.0-1.1 times;

(3) Dyeing the washed PVA film at 40-50 ℃ for 115-125s, wherein the dye is a composite dye consisting of yellow dye and green dye, the concentration of the yellow dye is 2.55A-3.1A, and the concentration of the green dye is 1.5-2.0A; extending the PVA film in the dyeing process, wherein the extension multiplying power is 2.0-2.5 times;

(4) Fixing the dyed PVA film at the temperature of 30-35 ℃ for 20-80s, wherein the fixing agent is sodium salt solution, the sodium salt is sodium chloride, sodium sulfate or sodium thiosulfate, and the concentration of the sodium salt is 0.5-3 per mill; extending the PVA film in the color fixing process, wherein the extension multiplying power is 0.9-1.1 times;

(5) Extending the PVA film after color fixation at 40-50 ℃, wherein the extension multiplying power is 1.5-2.0 times, and in the extension process, adopting boric acid solution to strengthen the structure of the PVA film, wherein the concentration of boric acid in the boric acid solution is 2.0-3.0%;

(6) Drying the PVA film after the strengthening treatment at the temperature of 50-70 ℃, and then compounding the PVA film after the drying with the TAC film after the saponification treatment; and drying and rolling the compounded film again at the temperature of 50-70 ℃ to obtain the composite film.

The yellow-green night vision optical lens film prepared by the method has the monomer transmittance of 77-78%, preferably 77.7-77.9%.

Further, the optical lens film had a polarization degree of 18.0% ± 1.0%, L value of 91 ± 1,a × -15.5 ± 0.5, b value of 25.5 ± 0.5.

In the production of the optical lens film, the swelling and washing functions to soften the PVA film, homogenize the structure within the PVA film and wash out the plasticizer in the PVA film. Polyvinyl alcohol (PVA) films are polymeric films that form crystalline and amorphous regions during the molding process. The crystal zone mainly uses intramolecular hydrogen bonds as main components, the structural strength is high, the molecular gap is small, the dye molecules are not favorably entered, and the swelling and water washing just utilize the entry of water molecules to enable the water molecules and the water molecules to form intermolecular hydrogen bonds, so that the intermolecular gap is enlarged, the structural strength of the film is reduced, and the dye molecules are favorably entered. The temperature and time of swelling and washing with water are controlled because the polyvinyl alcohol (PVA) film itself, if it is too long in water, causes its tensile properties to be degraded and broken.

In the step (1), the swelling temperature of the PVA film is 29 to 32 ℃ when swelling is performed, and may be, but is not limited to, 29 ℃, 30 ℃, 31 ℃ or 32 ℃, and the swelling temperature is preferably 30 to 31 ℃ without affecting the effect of the present invention.

In the step (1), the swelling time of the PVA film is 60 to 200 seconds, but may be, but is not limited to, 60 seconds, 80 seconds, 90 seconds, 100 seconds, 110 seconds, 120 seconds, 130 seconds, 140 seconds, 150 seconds, 160 seconds, 180 seconds, or 200 seconds, and the swelling time is preferably 100 to 140 seconds without affecting the effect of the present invention.

In the step (1), the PVA film is stretched during swelling, and the stretching magnification is 1.3 to 1.5 times, but may be, but is not limited to, 1.3 times, 1.34 times, 1.38 times, 1.4 times, 1.42 times, 1.45 times, or 1.5 times, and the stretching magnification is 1.35 to 1.4 times without affecting the effect of the present invention.

The polyvinyl alcohol (PVA) film has a strong water absorption property and a temperature that can affect the brownian motion of molecules, so the temperature of water washing is set to 29-32 ℃, and may be, but is not limited to, 29 ℃, 30 ℃, 31 ℃ or 32 ℃. The washing temperature is preferably 30 to 31 ℃ without impairing the effect of the present invention. If the water washing temperature is too low, the speed of water molecules entering the PVA film is slowed, so that the softening time of the PVA film is prolonged; secondly, the solubility of the plasticizer in the PVA film in water is increased along with the increase of the temperature, the insufficient dissolution of the plasticizer can be caused by the excessively low washing temperature, and the entering of dye molecules in the subsequent dyeing can be influenced, so that the optical index does not reach the standard. If the water washing temperature is too high, the water molecules enter the PVA film in an accelerated manner, so that the PVA film is softened excessively, the tensile property is reduced, and meanwhile, dye molecules entering during subsequent dyeing are diluted, so that the optical index does not reach the standard.

Similarly, when a polyvinyl alcohol (PVA) film is washed with water, the washing time is too long, and a plasticizer in the PVA film can be sufficiently dissolved out, but the PVA film is excessively softened, the tensile property is reduced, and the PVA film is broken during subsequent stretching, so that the production efficiency is affected. If PVA membrane washing time is too short, then the plasticizer in the PVA membrane can not be washed out by fully, hinders the entering of dye molecule when follow-up dyeing and causes optical index not up to standard, in addition, because the time is short, leads to the membrane softening degree not enough, fracture when can cause follow-up drawing, influences production efficiency. In the step (2), when the PVA film is washed with water, the washing time is 60 to 300s, but may be, but not limited to, 60s, 80s, 90s, 100s, 110s, 120s, 130s, 140s, 150s, 160s, 180s, 200s, 240s, 260s, 280s, or 300s, and is preferably 80 to 240s without affecting the effect of the present invention.

In a preferred embodiment, the PVA film is washed with water, and the water used is ultrapure water with a resistance value of 12M omega or more and a pH value of 7.

In the step (2), the PVA film is stretched in the water washing process, and the stretching magnification is 1.0 to 1.1 times, but may be, but is not limited to, 1.0 time, 1.01 times, 1.02 times, 1.03 times, 1.04 times, 1.05 times, 1.08 times, or 1.1 times, and the stretching magnification is 1.01 to 1.05 times without affecting the effect of the present invention.

In the step (3), the invention adopts bicolor dye to dye, namely, the yellow dye and the green dye are dissolved according to the proportion and then dyed. After the PVA film is dyed, the color of the PVA film is changed from colorless transparency to yellow green, and the PVA film has certain transmittance. However, if the dyeing time of the PVA film is too long, the monomer transmittance of the whole product is reduced even less than 76%, and if the dyeing time is too short, the dyeing effect is reduced, so that the monomer transmittance of the whole product is too high or even more than 78%, therefore, the dyeing time is 110-125s during dyeing, which can be, but is not limited to, 110s, 113s, 115s, 118s, 120s, 123s or 125s, and the dyeing time is preferably 115-120s without affecting the effect of the invention.

During dyeing, the structure of the PVA film is not reinforced, and if the temperature is too high, the following two adverse conditions occur: firstly, the PVA film can be further swelled and softened, so that the structural strength of the PVA film is greatly reduced, and the PVA film is broken during subsequent stretching; secondly, the molecular Brownian motion is accelerated due to the over-high temperature, so that the coloring rate is increased, and finally, the transmittance of the product is reduced and the product is not qualified. Therefore, the dyeing temperature is set to be 40-50 ℃ during dyeing, the dyeing temperature can be, but is not limited to, 40 ℃, 41 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃ or 50 ℃, and the dyeing temperature is preferably 45-47 ℃ under the condition that the effect of the invention is not influenced.

In the step (3), the PVA film is stretched during dyeing, and the stretching magnification is 2.0 to 2.5 times, but may be, but is not limited to, 2.0 times, 2.1 times, 2.2 times, 2.3 times, 2.4 times, or 2.5 times, and the stretching magnification is 2.1 to 2.3 times without affecting the effect of the present invention.

For the invention, when the PVA film is dyed, if the concentration of yellow dye is too high, the whole color of the product is yellow, although the night vision effect can be achieved, the brightness of the product to light is increased due to the too high yellow dye component, the visual fatigue is easy to cause, and the transmission ratio of blue light is less than 0.6 under the spectrum within the range of 475nm-650nm, so that the standards that the transmission ratio of blue light under LED traffic lights in Australian standards and Europe standards is more than 0.7 and 0.6 cannot be met; if the concentration of the green dye is too high, the color of the whole product is green, although the standards that the blue light transmission ratio is more than 0.7 and 0.6 under the LED traffic signal lamps in the Australian standard and the European standard can be met, the night vision effect is greatly weakened, and even the night vision effect is not achieved. Therefore, in the step (3), the concentration of the yellow dye is controlled to be 2.55A-3.1A, preferably 2.75A-3.03A, and more preferably 2.92A-3.03A under the condition of not influencing the product effect during dyeing; the concentration of the green dye is controlled to be 1.5-2.0A, preferably 1.7-1.9A, and more preferably 1.75A-1.80A under the condition of not influencing the effect of the product.

The PVA film needs to be fixed after dyeing, otherwise, dye molecules dyed in the PVA film fall off again, so that the transmittance of the product is increased and the product does not meet the requirement. For the purposes of the present invention, dye shedding during fixation can be caused by several reasons: firstly, the molecular Brownian motion is accelerated due to the overhigh temperature, so that the dye molecules are accelerated to fall off; secondly, electrostatic force on the surface of the PVA film and electrostatic force on the surface of the dye molecule are mutually repelled and fall off; third, there is no dye molecule in the color fixing tank, the PVA film is full of a large amount of dye molecules, and the molecules are diffused from high concentration to low concentration all the time to make the dye molecules fall off. That is, if the fixing temperature is too low, the PVA film may shrink seriously and cause product appearance defects, so in the step (4), the fixing temperature is set to 30 ℃ to 35 ℃ during fixing, which may be, but is not limited to, 30 ℃, 31 ℃, 33 ℃, 34 ℃ or 35 ℃, and is preferably 31 ℃ to 33 ℃ without affecting the effect of the present invention.

In the step (4), in the fixing, the fixing time is 20-80s, but can be, but is not limited to, 20s, 30s, 40s, 50s, 60s, 70s or 80s, and the dyeing time is preferably 50-70s without affecting the effect of the invention.

Because the surfaces of the dye molecules and the PVA film are both anions and have negative charges, the addition of a cation with positive charges can slow down the mutual repulsion force of the dye molecules and the PVA film surface. Aiming at the problem, the sodium salt solution is finally determined to be selected as the color fixing agent during color fixing through a large amount of experimental exploration. Wherein the sodium salt is sodium chloride, sodium sulfate or sodium thiosulfate. Under the condition of not influencing the product effect and the economic and environmental protection, the sodium salt is further preferably sodium chloride.

In the color fixing process, the color fixing agent with too low concentration cannot play a color fixing role, and the color fixing agent with too high concentration causes waste and cost increase, so in the step (4), the color fixing agent is a sodium salt solution, the concentration of sodium salt in the sodium salt solution is 0.5-3%, but not limited to 0.5, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5 or 3.0%, and under the condition of not affecting the color fixing effect and economic and environmental protection, the sodium salt is sodium chloride, and the concentration of sodium chloride in the sodium chloride solution is 0.5-1.5%, and particularly preferably 1.0%.

In the step (4), the PVA film is stretched during the fixation process, and the stretching magnification is 0.9 to 1.1 times, but may be, but is not limited to, 0.9 times, 0.95 times, 0.98 times, 1.0 times, 1.02 times, 1.05 times or 1.1 times, and the stretching magnification is 0.95 to 1.05 times without affecting the effect of the present invention.

For the present invention, in the step (5), the fixed PVA film is stretched at 40 to 50 ℃, and the stretching temperature is set to 40 ℃ to 50 ℃, which may be, but is not limited to, 40 ℃, 41 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃ or 50 ℃, and is preferably 45 to 47 ℃ without affecting the effect of the present invention. In the extending process, the structure of the PVA film is strengthened, a borax solution or a boric acid solution is generally adopted, and the boric acid solution is preferably used for strengthening the structure under the condition of not influencing the product effect. Since the dyes used change color under alkaline conditions, borax solutions are strongly alkaline. The boric acid can be complexed with hydroxyl in the PVA film, so that the structural strength of the PVA film can be enhanced, the hydrophilicity of the PVA film can be reduced, and a waterproof effect is achieved, but the too high concentration of the boric acid can greatly reduce the hydrophilicity of the PVA film, influence subsequent bonding fastness, and cause folding and shrinkage of the PVA film due to too low concentration of the boric acid, so that appearance defects are caused, when the PVA film is enhanced by adopting the boric acid solution, the concentration of the boric acid in the boric acid solution is 2.0% -3.0%, but not limited to 2.0%, 2.1%, 2.2%, 2.3%, 2.5%, 2.6%, 2.8% or 3.0%, and under the condition of not influencing the product effect, the concentration of the boric acid in the boric acid solution is preferably 2.3% -2.6%, and particularly preferably 2.5%.

In the step (5), when the PVA film is stretched, the stretching magnification is 1.5 to 2.0 times, but may be, but not limited to, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.82 times, 1.84 times, 1.9 times, 1.95 times, or 2.0 times, and the stretching magnification is 1.7 to 1.9 times without affecting the effect of the present invention.

For the present invention, in step (6), the PVA film after the strengthening treatment is dried at 50 to 70 ℃, and the drying temperature may be, but is not limited to, 50 ℃, 55 ℃, 60 ℃, 65 ℃ or 70 ℃, and is preferably 55 to 65 ℃ without affecting the effect of the present invention. The drying time is 60-120 s, but not limited to 60s, 70s, 80s, 90s, 100s, 110s or 120s.

In the step (6), the TAC film is saponified with an alkali solution having a concentration of 8.0%, which is generally an alkali solution commonly used in the art, such as sodium hydroxide solution, potassium hydroxide solution or sodium carbonate solution.

Further, in the step (6), the TAC film is saponified in a sodium hydroxide solution with a concentration of 8.0% at 45 ℃, and then the dried PVA film and the saponified TAC film are compounded, so that the TAC film is attached to two side surfaces of the PVA film, and a TAC-PVA-TAC three-layer film structure is formed.

Further, the film after the compounding is dried again under the condition of 50-70 ℃, the temperature of the second drying can be but not limited to 50 ℃, 55 ℃, 60 ℃, 65 ℃ or 70 ℃, and the temperature of the second drying is preferably 55-65 ℃ under the condition of not influencing the effect of the invention. The drying time is 200-400 s, but not limited to 200s, 250s, 300s, 350s or 400s.

By adopting the technical scheme of the invention, the advantages are as follows:

the yellow-green night vision optical lens film prepared by the method has the advantages that the monomer transmittance of the optical lens film is 77-78%, the polarization degree is 18.0% +/-1.0%, and the blue light transmittance ratio is high and can reach more than 0.7; not only can use also can be used for night daytime, especially when it is used for night time, when preventing the distance light, also can not cause visual fatigue, satisfy simultaneously the european standard LED signal lamp blue light and see through and be greater than 0.6, and the requirement that the australian standard LED signal lamp blue light is greater than 0.7 is passed through to australia standard LED signal lamp blue light.

Detailed Description

The preparation of the yellow-green night vision optical lens film of the present invention is further illustrated by the following examples, which are not intended to limit the invention in any way.

Example 1

The materials used were determined before start-up: a Wanwei polyvinyl alcohol (PVA) film with a thickness of 75 μm; lekeka cellulose Triacetate (TAC) film, its thickness is 80 μm; according to the characteristics of each membrane material, relevant parameters such as swelling temperature and time, dyeing temperature and time, dye concentration, fixation temperature and the like are determined, and the machine can be started after the parameters meet the starting requirements.

A yellow-green night vision optical lens film is prepared by the following steps:

(1) The PVA film is placed in a swelling tank to swell for 120s at 30 ℃, and the PVA film is stretched in the swelling process, wherein the stretching magnification is 1.38 times.

(2) Placing the swelled PVA film in a washing tank, washing for 110s at 31 ℃, and extending the PVA film in the washing process, wherein the extension multiplying power is 1.01 times; when washing with water, the water is ultrapure water with resistance value more than or equal to 12 MOmega and pH value of 7.

(3) Placing the washed PVA film in a dyeing tank for dyeing at 46 ℃ for 120s; extending the PVA film in the dyeing process, wherein the extension multiplying power is 2.2 times; wherein, the dye is a composite dye composed of yellow dye and green dye, the concentration of the yellow dye is 3.0A, and the concentration of the green dye is 1.8A.

(4) Placing the dyed PVA film in a color fixing tank for color fixing at 32 ℃, and extending the PVA film in the color fixing process, wherein the extension multiplying power is 1.0 time; wherein the color fixing agent is sodium chloride solution, the concentration of sodium chloride in the sodium chloride solution is 1 per mill, and the color fixing time is 60s.

(5) And (3) placing the fixed PVA film in an extension tank for extension at 46 ℃, wherein the extension rate is 1.82 times, and in the extension process, adopting a boric acid solution to strengthen the structure of the PVA film, wherein the concentration of boric acid in the boric acid solution is 2.5%.

(6) Drying the reinforced PVA film for 90s at 60 ℃, saponifying the TAC film at 45 ℃ by using alkali liquor (sodium hydroxide solution) with the concentration of 8.0%, and compounding the dried PVA film and the saponified TAC film to ensure that the TAC film is attached to two side surfaces of the PVA film to form a three-layer film structure; and drying the compounded film again for 300s at the temperature of 60 ℃, and rolling to obtain the film.

The transmittance of the optical lens film was measured by a UV2600 UV spectrophotometer from shimadzu, japan, and the data was processed by Color Analysis software. The specific test method is as follows: the film sample to be tested is cut into a sample with the size of 4cm multiplied by 6cm, the light absorption axis and the 0-degree edge are kept to form an angle of 45 degrees in the testing process, and parameters of the Japanese Shimadzu UV2600 ultraviolet spectrophotometer are set as follows: the width of the slit is 5nm, the scanning speed is medium speed, and the scanning wavelength is 380nm-780nm. In calculating the degree of polarization (P), the colorimeter standard is: l is 90.88, a is-15.5, b is 25.4.

The optical indexes mainly adopt Australian and European standards at present. The standard of the European standard LED signal lamp is that blue light penetrates through the signal lamp more than 0.6, and the standard of the Australian standard LED signal lamp is that blue light penetrates through the signal lamp more than 0.7. Blue light transmission is the ratio between the transmission measured at 475nm and the average transmission measured in the wavelength range from 475nm to 650 nm.

Appearance of the finished product: visual inspection was carried out.

The splinter test method was as follows: saponifying and drying a sample to be detected, attaching TAC (TAC) with the thickness of four layers of 270 mu m to two sides of the sample to be detected to thicken the sample, then drying the sample for 1 hour at the temperature of 90 ℃, then splitting the sample by a knife, and determining the film falling area of the sample to be detected, wherein the film falling area meets the requirement when the film falling area is less than 80%.

The optical lens film produced in example 1 and a commercially available product were tested, and the test results are shown in table 1.

TABLE 1 Effect data

Note: in the table, "√" indicates passage and "X" indicates no passage.

As can be seen from table 1, compared with the commercially available product, the optical lens film prepared in example 1 of the present invention has better blue light transmittance, and the blue light transmittance ratio is 0.7239, and simultaneously meets the requirements that the blue light transmittance of the european standard LED signal lamp is greater than 0.6 and the blue light transmittance of the australian standard LED signal lamp is greater than 0.7, so that the blue object can be more easily seen at night, and the safety is increased. The finished product of the optical lens film prepared by the invention is yellow-green in appearance, and the green can effectively block strong light, so that the optical lens film can be used not only in the daytime but also at night, and different glasses can be prevented from being switched back and forth; especially when it is used at night, it can prevent high beam and can not cause visual fatigue. The commercial products can only be used for night vision and are easy to cause visual fatigue.

Example 2

In example 2, the temperature of the PVA film during swelling was set at 31 ℃ and the swelling time was set at 100 seconds; the temperature during washing is set to be 30 ℃, and the swelling time is 120s; other steps referring to example 1, the obtained optical lens film was tested according to the same test method as in example 1, and as a result, it was found that the optical index monomer transmittance, blue light transmittance and split test results are similar to example 1, and the blue light transmittance is greater than 0.7, and at the same time, the requirements of the european standard and the australian standard were satisfied.

Example 3

In example 3, the temperature of the PVA film during swelling was set at 32 ℃ and the swelling time was set at 180s; the temperature during washing is set to 29 ℃, and the swelling time is 180s; other steps, referring to example 1, the obtained optical lens film is tested according to the same test method in example 1, and as a result, the optical index monomer transmittance, blue light transmittance ratio and splinter test results are similar to example 1, and the blue light transmittance ratio is greater than 0.7, and simultaneously meets the requirements of the european standard and the australian standard.

Example 4

In example 4, the temperature of the PVA film during swelling was set at 29 ℃ and the swelling time was set at 140 seconds; the temperature during water washing is set as 32 ℃, and the swelling time is 250s; other steps, referring to example 1, the obtained optical lens film is tested according to the same test method in example 1, and as a result, the optical index monomer transmittance, blue light transmittance ratio and splinter test results are similar to example 1, and the blue light transmittance ratio is greater than 0.7, and simultaneously meets the requirements of the european standard and the australian standard.

Example 5

In example 5, the PVA film was dyed at 45 ℃ for 115 seconds, and the other steps were performed according to the same test method as in example 1 with reference to example 1, and it was found that the optical index monomer transmittance, blue light transmittance, and split test results were similar to example 1, and the blue light transmittance was greater than 0.7, and satisfied the requirements of the european standard and the australian standard.

Example 6

In example 6, the PVA film was dyed at a temperature of 43 ℃ for a dyeing time of 110 seconds, and the optical lens film obtained in the other steps was examined by the same test method as in example 1 with reference to example 1, and as a result, it was found that the optical indices monomer transmittance, blue light transmittance, and split test results were similar to example 1, and the blue light transmittance was greater than 0.7, and the requirements of the european standard and the australian standard were satisfied.

Example 7

In example 7, the PVA film was dyed at a temperature of 48 ℃ for 123 seconds, and the other steps were performed according to the same test method as in example 1 except that the PVA film was used in the same manner as in example 1, and it was found that the optical index monomer transmittance, blue light transmittance, and split test results were similar to those of example 1, and the blue light transmittance was greater than 0.7, and the requirements of the european standard and the australian standard were satisfied.

Example 8

In example 8, the temperature of the PVA film at the fixation time is set to 30 ℃, the fixation time is 70s, the other steps are performed according to the same test method as in example 1, and the obtained optical lens film is tested according to the test method in example 1, and as a result, the optical index monomer transmittance, the blue light transmittance and the splinter test result are similar to those in example 1, and the blue light transmittance is greater than 0.7, and the requirements of the european standard and the australian standard are met.

Example 9

In example 9, the temperature of the PVA film at the fixation time is set to 34 ℃, the fixation time is 80s, the other steps are performed according to the same test method as in example 1, and the obtained optical lens film is tested according to the test method in example 1, and as a result, the optical index monomer transmittance, the blue light transmittance and the splinter test result are similar to those of example 1, and the blue light transmittance is greater than 0.7, and the requirements of the european standard and the australian standard are met.

Example 10

In example 10, the PVA film was reinforced with a boric acid solution (boric acid concentration of 2.8%) at a temperature of 41 ℃ during stretching, and the optical lens film obtained in the other steps was examined by the same test method as in example 1 with reference to example 1, and as a result, it was found that the optical indices monomer transmittance, blue light transmittance and split sheet test results were similar to example 1, and the blue light transmittance was greater than 0.7, while satisfying the requirements of the european and australian standards.

Example 11

In example 11, the PVA film was stretched at a temperature of 48 ℃, and the structure of the PVA film was reinforced with a boric acid solution (boric acid concentration of 3.2%), and the optical lens film obtained in the other steps was examined by the same test method as in example 1 with reference to example 1, and as a result, it was found that the optical indices monomer transmittance, blue light transmittance and split sheet test results were similar to example 1, and the blue light transmittance was greater than 0.7, and the requirements of the european and australian standards were satisfied.

Comparative example 1

In this comparative example 1, the temperatures of the PVA film at swelling and washing were set to 25 ℃, respectively, and the other steps were performed according to the same test method as in example 1, and it was found that the optical index monomer transmittance and the blue light transmittance ratio were satisfactory, but the film falling area was about 90% at the splitting test, which was not satisfactory, and thus did not pass the optical index monomer transmittance and the blue light transmittance ratio.

Comparative example 2

In this comparative example 2, when the PVA film was dyed while the dyeing time was shortened from 120s to 100s, and the other steps were performed with reference to example 1, the obtained optical lens film was examined according to the same test method as in example 1, and as a result, it was found that: the transmittance measured at 475nm is 50.05%, the average transmittance measured in the wavelength range of 475nm-650nm is 77.56%, and the blue light transmittance is calculated to be 0.65 and can not reach the Australian standard (0.7).

Comparative example 3

In this comparative example 3, when the PVA film was dyed while the dyeing time was extended from 120s to 130s, and the other steps were performed with reference to example 1, the obtained optical lens film was examined according to the same test method as in example 1, and as a result, it was found that: the transmittance measured at 475nm is 56.56%, the average transmittance measured in the wavelength band range of 475nm-650nm is 75.85%, the blue light transmittance ratio is 0.75, the monomer transmittance (Ts) is 76.05%, and the monomer transmittance (Ts) does not meet the requirement of 77-78%.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications of the technical solutions described in the foregoing embodiments are still possible, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation method of a yellow-green night vision optical lens film is characterized by comprising the following steps:

(1) Swelling the PVA film at the temperature of 30-31 ℃ for 100-140s, and extending the PVA film in the swelling process, wherein the extension multiplying power is 1.35-1.4 times;

(2) Washing the swelled PVA film with water at 30-31 ℃ for 80-240s, and extending the PVA film in the washing process, wherein the extension multiplying power is 1.01-1.05 times; the water used in the water washing is ultrapure water with the resistance value more than or equal to 12 MOmega and the pH value of 7;

(3) Dyeing the washed PVA film at the temperature of 45-47 ℃ for 115-120s, wherein the dye is a composite dye consisting of yellow dye and green dye, the concentration of the yellow dye is 2.92-3.0A, and the concentration of the green dye is 1.75-1.80A; extending the PVA film in the dyeing process, wherein the extension multiplying power is 2.1 to 2.3 times;

(4) Fixing the dyed PVA film at 31-33 ℃ for 50-70s, wherein the fixing agent is a sodium chloride solution, and the concentration of the sodium chloride is 0.5-1.5 per mill; extending the PVA film in the color fixing process, wherein the extension multiplying power is 0.95 to 1.05 times;

(5) Extending the PVA film after color fixation at the temperature of 45-47 ℃, wherein the extension multiplying factor is 1.7-1.9 times, and in the extension process, adopting a boric acid solution to reinforce the structure of the PVA film, wherein the concentration of boric acid in the boric acid solution is 2.3-2.6%;

(6) Drying the PVA film after the strengthening treatment at 50-70 ℃, and then compounding the PVA film after the drying and the TAC film after the saponification treatment; drying the compounded film again at 50 to 70 ℃, and rolling to obtain the film; wherein the monomer transmittance of the optical lens film is 77% -78%; the degree of polarization was 18.0% + -1.0%, the L value was 91 + -1,a the value-15.5 + -0.5, and the b value was 25.5 + -0.5.

2. The method for preparing a yellowish green night vision optical lens film as claimed in claim 1, wherein the optical lens film has a monomer transmittance of 77.7 to 77.9%.

3. The method for preparing a yellowish green night vision optical lens film as claimed in claim 1, wherein in the step (6), the first drying is carried out at a temperature of 55 to 65 ℃ for 60 to 120s; and during the second drying, the drying temperature is 55 to 65 ℃, and the drying time is 200 to 400s.