A method and system for detecting the water resistance of an optical protective film

Abstract

The present invention relates to the technical field of optical protective films, and specifically discloses a waterproofness detection method and system for an optical protective film, including performing a water droplet contact angle test on the optical protective film, constructing a sealed test chamber, performing a differential pressure humidity penetration test, calculating to obtain the water permeability value of the optical protective film, then taking the optical protective film after the differential pressure humidity penetration test, performing a light transmittance refractive index test, calculating to obtain the light transmittance refractive loss rate of the optical protective film, and finally performing a moisture penetration conductivity test on the optical protective film, calculating to obtain the resistivity state performance value of the optical protective film, obtaining a qualified signal for the optical protective film, judging the waterproof and insulating performance of the optical protective film, and further evaluating the conductive performance of the optical protective film to avoid the situation that the resistivity decreases during the application of the optical protective film and affects the use.

Description

Technical Field

[0001] The present invention relates to the technical field of optical protective films, and particularly relates to a waterproof detection method and system for an optical protective film. Background Art

[0002] A protective film is a thin film used to protect a vulnerable surface. Its purpose is to prevent the surface of the protected substrate from being damaged or contaminated during transportation, assembly, or processing, and the protective film will always adhere to the surface of the protected substrate. As an important functional thin film, the optical protective film has a wide range of applications in the fields of photography, display, optical instruments, etc. With the continuous development of technology, the performance requirements for optical protective films are also getting higher and higher.

[0003] During the use of an optical thin film, in order to protect the surface of the thin film from being damaged, a special optical protective film is usually required for surface protection. The optical protective film needs to have certain performance requirements during use, such as waterproofing, resistance, etc. In the current production and detection process of optical protective films, the optical protective film cannot be detected synchronously from multiple aspects, and the detection effect and results are single. Summary of the Invention

[0004] The purpose of the present invention is to provide a waterproof detection method and system for an optical protective film to solve the problems in the above background.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A waterproof detection method for an optical protective film includes:

[0007] Step 1: Perform a water droplet contact angle test on the optical protective film, calculate the obtained water droplet contact angle SJA on the surface of the optical protective film through the test, compare the water droplet contact angle SJA with the qualified value SJhg of the water droplet contact angle, and obtain a hydrophobic qualified signal;

[0008] Step 2: Based on the hydrophobic qualified signal, construct a sealed test chamber, perform a differential pressure humidity penetration test, calculate the obtained water penetration rate value STA of the optical protective film, compare it with the water penetration rate threshold SThg, and obtain a water penetration rate qualified signal;

[0009] Step 3: Based on the water penetration rate qualified signal, take the optical protective film after the differential pressure humidity penetration test, perform a light transmittance refractive index test, calculate the obtained light transmittance refractive loss rate TGS of the optical protective film, compare it with the light transmittance refractive loss rate threshold TGhg, and obtain a penetration refraction qualified signal;

[0010] Step 4: Based on the qualified signal of penetration refraction, perform a moisture penetration conductivity test on the optical protection film, calculate the resistivity state performance value DZb of the optical protection film, and compare the resistivity state performance value DZb with the resistivity qualified value DZhg to obtain the qualified signal of the optical protection film.

[0011] As a further solution of the present invention: The process of testing and calculating the water droplet contact angle on the surface of the optical protection film includes:

[0012] A01: Place the optical protection film flat on a horizontal test bench, divide the surface of the optical protection film into grids with a unit length e, take any unit grid as the coordinate origin, then establish a grid coordinate system, and record the coordinates of each grid area as (x, y);

[0013] A02: Select several qualified test grid areas and mark the qualified test grid areas as r, where r is 1, 2, 3..., drop water droplets on each qualified test grid area on the optical protection film, measure and determine the contact angle between the water droplet and the optical protection film on each qualified test grid area, and record it as the contact angle value CTA r ;

[0014] A03: Calculate the mean value of the contact angle values CTA of all qualified test grid areas to obtain the water droplet contact angle SJA. r

[0015] As a further solution of the present invention: The selection method of the qualified test grid area is:

[0016] Obtain the surface height value of the optical protection film at the center point of the grid area (x, y), and record it as H （x，y） , and at the same time obtain the surface height values of the center points of the 8 adjacent grid areas of the grid area (x, y);

[0017] Calculate the height difference between the center point of the grid area (x, y) and the center points of the 8 adjacent grid areas respectively to obtain the maximum height difference, and record it as HCax （x，y） ;

[0018] If the maximum height difference HCax （x，y） is less than or equal to the height difference threshold, then the grid area (x, y) is a qualified test grid area.

[0019] As a further solution of the present invention: The determination method of the contact angle value between the water droplet and the optical protection film in the grid area is:

[0020] Drop a water droplet on the qualified test grid area r of the optical protection film. Connect lines from the center point of the qualified test grid area r where the water droplet is located to the center points of the adjacent 8 grid areas to determine the contact angle measurement points of the water droplet, and measure 8 contact angle values of the water droplet in the qualified test grid area r;

[0021] Calculate the average value of the 8 contact angle values to obtain the average contact angle of the qualified test grid area r. Take the contact angle value closest to the average contact angle value among the 8 contact angle values and denote it as the contact angle value CTA of the qualified test grid area r r 。

[0022] As a further solution of the present invention: The test calculation steps of the water permeability value STA include:

[0023] B01: Construct a sealed test chamber, respectively obtain the air pressure values in the high-humidity test chamber and the dry test chamber at each detection time node, and denote them as the high-humidity air pressure value HYC i and the dry air pressure value LYC i ;

[0024] B02: Take the detection period T with the unit time t as the detection time interval, and mark each detection time node as i, where i is 1, 2, 3...;

[0025] Obtain the total water permeation amount at each detection time node and mark it as QW i ;

[0026] B03: Obtain the test basic data for the optical protection film test, including the protective film thickness value DH and the protective film area value SM;

[0027] Through Calculate the water permeability value SP at each detection time node i Obtain the set of water permeability values within the detection period T;

[0028] Obtain the maximum water permeability value in the set of water permeability values and denote it as the water permeability value STA.

[0029] As a further solution of the present invention: The construction method of the sealed test chamber is: Fix the optical protection film in the middle of the sealed chamber to divide the sealed test chamber into two test chambers. Inject humidity into any one of the test chambers and mark this test chamber as the high-humidity test chamber, and mark the other test chamber as the dry test chamber.

[0030] As a further solution of the present invention: The air pressure value in the high-humidity test chamber is higher than the air pressure value in the dry test chamber, and the temperatures in the high-humidity test chamber and the dry test chamber are the same.

[0031] As a further solution of the present invention: The calculation method of the light transmission and refraction loss rate of the optical protective film is as follows:

[0032] C01: Take the optical protective film after the differential pressure humidity penetration test, irradiate the center points of several qualified test grid areas on the protective film with a test light source with a light intensity of QR, and then obtain the transmitted light intensity of the center points of each qualified test grid area, denoted as TG r ;

[0033] Through Calculate the light transmittance value TL of the center point of each qualified test grid area r ;

[0034] C02: Obtain the initial light transmittance value TS of the optical protective film, and calculate the point light transmission and refraction loss rate value TDS of the optical protective film through r ;

[0035] C03: Perform an average value calculation on the point light transmission and refraction loss rate value TDS r To obtain the light transmission and refraction loss rate TGS of the optical protective film.

[0036] As a further solution of the present invention: The calculation method of the resistivity state performance value DZb of the optical protective film includes the following steps:

[0037] W1: Cut the optical protective film under the penetration and refraction qualified signal into several single strips of protective film with a length value of a and a width value of b, and mark the single strips of protective film as j, where j is 1, 2, 3...; Perform a conductivity test on each single strip of protective film, test the resistance value of each single strip of protective film, and mark it as R j ;

[0038] W2: Calculate the resistivity value DL of each single strip of protective film through j , where DH is the protective film thickness value;

[0039] W3: Perform an average value calculation on the resistivity values to obtain the average single-strip resistivity value DLZ, and then perform a standard deviation calculation on the resistivity values to obtain the resistivity standard deviation value DLC of the single strips of protective film;

[0040] Then calculate the resistivity state performance value DZb through

[0041] As a further solution of the present invention: A waterproof detection system for an optical protective film includes:

[0042] Hydrophobic detection module: It performs a water droplet contact angle test on the optical protection film, calculates the water droplet contact angle SJA on the surface of the optical protection film through the test, compares the water droplet contact angle SJA with the qualified value of the water droplet contact angle SJhg, and obtains a hydrophobic qualified signal;

[0043] Penetration detection module: Based on the hydrophobic qualified signal, it constructs a sealed test chamber, conducts a differential pressure humidity penetration test, calculates the water penetration rate value STA of the optical protection film, and compares it with the water penetration rate threshold SThg to obtain a water penetration rate qualified signal;

[0044] Light transmission detection module: Based on the water penetration rate qualified signal, it takes the optical protection film after the differential pressure humidity penetration test and conducts a light transmission refractive index test, calculates the light transmission refractive loss rate TGS of the optical protection film, and compares it with the light transmission refractive loss rate threshold TGhg to obtain a penetration refraction qualified signal;

[0045] Conductive detection module: Based on the penetration refraction qualified signal, it conducts a moisture penetration conductivity test on the optical protection film, calculates the resistivity state performance value DZb of the optical protection film, and compares the resistivity state performance value DZb with the resistivity qualified value DZhg to obtain an optical protection film qualified signal.

[0046] Advantages of the present invention:

[0047] In the present invention, by randomly sampling the optical protection films in a batch, first detecting the hydrophobicity of the surface of the optical protection film, measuring and calculating the contact angle of water droplets on the flat and stable surface of the optical protection film, and then judging whether the hydrophobicity of the surface of the optical protection film meets the requirements, the waterproof property of the surface of the optical protection film can be effectively evaluated. Then, by constructing a sealed test chamber for penetration testing and calculating the water penetration rate, the penetration performance of the optical protection film can be quantitatively measured, and the internal waterproof performance of the optical protection film can be accurately evaluated. In addition, after the penetration test, directly evaluate the loss during the light transmission process of the optical protection film through calculation, further measure and determine the influence of the optical protection film on light during the process of water penetration. Finally, for the optical protection film in the case of water penetration, conduct a resistivity test to judge the waterproof and insulating performance of the optical protection film, and further evaluate the conductive performance of the optical protection film, avoiding the situation that the resistivity decreases during the application of the optical protection film and affects its use. Description of the drawings

[0048] The present invention will be further described below with reference to the drawings.

[0049] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0050] Figure 2 It is a system block diagram of the present invention. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] Embodiment 1: Please refer to Figure 1 As shown, the present invention is a waterproof detection method for an optical protective film, including:

[0053] Step 1: Take the optical protective films in the same batch, perform a water droplet contact angle test on the optical protective films, test and calculate to obtain the water droplet contact angle SJA on the surface of the optical protective film, compare the water droplet contact angle SJA with the qualified value SJhg of the water droplet contact angle, and obtain a hydrophobic qualified signal;

[0054] Among them, the process of testing and calculating the water droplet contact angle on the surface of the optical protective film includes:

[0055] A01: Place the optical protective film flat on a horizontal test bench, divide the surface of the optical protective film into grids with a unit length e, take any unit grid as the coordinate origin, then establish a grid coordinate system, and record the coordinates of each grid area as (x, y);

[0056] A02: Select several qualified test grid areas and mark the qualified test grid areas as r, where r is 1, 2, 3..., drop water droplets on each qualified test grid area on the optical protective film, measure and determine the contact angle between the water droplets and the optical protective film on each qualified test grid area, and record it as CTA r ;

[0057] Regarding the selection method of the qualified test grid area:

[0058] Obtain the surface height value of the optical protective film at the center point of the grid area (x, y), and record it as H （x，y） , and at the same time obtain the surface height values of the center points of the 8 adjacent grid areas of the grid area (x, y), and record them as H （x-1，y+1） , H （x，y+1） , H （x+1，y+1） , H （x-1，y） , H （x+1，y） , H （x-1，y-1） , H （x，y-1） and H （x+1，y-1） ;

[0059] Calculate the height difference between the center point of the grid area (x, y) and the center points of the adjacent 8 grid areas respectively, and obtain the maximum height difference, denoted as HCax （x，y） ;

[0060] If the maximum height difference HCax （x，y） is less than or equal to the height difference threshold, then the grid area (x, y) is a qualified test grid area and can be used as a contact angle test area;

[0061] During the test, determine the qualified test grid area to avoid the situation that the surface is not on the same horizontal plane due to the shape characteristics of the optical protective film during the test, which may affect the test results, and ensure the accuracy during the contact angle measurement;

[0062] The determination method of the water droplet contact angle between the water droplet and the optical protective film in the grid area is as follows:

[0063] A021: Drop a water droplet on the qualified test grid area r on the optical protective film. Connect the center point of the qualified test grid area r where the water droplet is located to the center points of the adjacent 8 grid areas to determine the contact angle measurement points of the water droplet, and measure 8 contact angle values of the water droplet in the qualified test grid area r;

[0064] A022: Calculate the average value of the 8 contact angle values to obtain the average contact angle of the qualified test grid area r. Take the contact angle value closest to the average contact angle among the 8 contact angle values, denoted as the contact angle value CTA of the qualified test grid area r r ;

[0065] A03: Calculate the average value of the contact angle values CTA of all qualified test grid areas r to obtain the water droplet contact angle SJA;

[0066] By measuring the contact angles at multiple angles of the water droplet and calculating to obtain the water droplet contact angle, the accuracy of the water droplet contact angle measurement is further improved;

[0067] In addition, compare the water droplet contact angle SJA with the qualified value SJhg of the water droplet contact angle:

[0068] If the water droplet contact angle SJA is greater than or equal to the qualified value SJhg of the water droplet contact angle, generate a hydrophobic qualified signal; at this time, it indicates that the hydrophobicity of the water droplet on the surface of the optical protective film can meet the requirements;

[0069] If the water droplet contact angle SJA is less than the qualified value SJhg of the water droplet contact angle, generate a hydrophobic unqualified signal;

[0070] Step 2: Based on the hydrophobicity qualified signal, construct a sealed test chamber, conduct a differential pressure humidity penetration test, calculate the water permeability value STA of the optical protective film, and compare it with the water permeability threshold SThg to obtain the water permeability qualified signal;

[0071] The test calculation steps of the water permeability value STA include:

[0072] B01: Construct a sealed test chamber, fix the optical protective film in the middle of the sealed chamber to divide the sealed test chamber into two test chambers, inject humidity into any one of the test chambers, mark this test chamber as the high-humidity test chamber, and mark the other test chamber as the dry test chamber; obtain the air pressure values in the high-humidity test chamber and the dry test chamber at each detection time node, and record them as the high-humidity air pressure value HYC i and the dry air pressure value LYC i ; In this step, since the water permeability of the optical protective film is measured, the air pressure value in the high-humidity test chamber should be higher than that in the dry test chamber. At this time, the water penetration volume at each detection time node can be accurately measured. At the same time, to avoid liquefaction in the air and affect the detection accuracy, it is necessary to ensure that the temperatures in the two test chambers are the same;

[0073] B02: Take the detection period T with the unit time t as the detection time interval, and mark each detection time node as i, where i is 1, 2, 3...;

[0074] Obtain the total water penetration volume at each detection time node and mark it as QW i It should be noted that: the total water penetration volume at each detection time node is the total water penetration volume from the initial moment to the current detection time node;

[0075] B03: Obtain the test basic data for the optical protective film test, including the protective film thickness value DH and the protective film area value SM;

[0076] Through Calculate the water permeability value SP at each detection time node i Obtain the water permeability value set within the detection period T;

[0077] Obtain the maximum water permeability value in the water permeability value set and mark it as the water permeability value STA;

[0078] Among them, compare the water permeability value STA with the water permeability threshold SThg:

[0079] If the water permeability value STA is less than or equal to the water permeability threshold SThg, generate a water permeability qualified signal;

[0080] If the water permeability value STA is greater than the water permeability threshold SThg, generate a water permeability unqualified signal;

[0081] By constructing a sealed test chamber, adjusting the humidity difference on both sides of the optical protective film, testing the permeation performance of the optical protective film, and calculating the water permeability based on the test results, the quantitative calculation of the water permeability is realized, which has certain reference significance in evaluating the permeation performance of the optical protective film;

[0082] Compared with the hydrophobicity test, it not only realizes the external waterproof test of the optical protective film, but also accurately measures the internal waterproofness of the optical protective film;

[0083] Step 3: Based on the qualified signal of water permeability, take the optical protective film after the differential-pressure humidity permeation test, conduct a light transmittance refractive index test, calculate the light transmittance refractive loss rate TGS of the optical protective film, and compare it with the light transmittance refractive loss rate threshold Tghg to obtain a qualified permeation refraction signal;

[0084] Specifically, the calculation method for the light transmittance refractive loss rate of the optical protective film is as follows:

[0085] C01: Take the optical protective film after the differential-pressure humidity permeation test, irradiate the center points of several qualified test grid areas on the protective film with a test light source with a light intensity of QR, and then obtain the transmitted light intensity of the center points of each qualified test grid area, denoted as TG r ;

[0086] Through Calculate the light transmittance value TL of the center point of each qualified test grid area r ;

[0087] C02: Obtain the initial light transmittance value TS of the optical protective film, and calculate the point light transmittance refractive loss rate value TDS of the optical protective film through ; r ;

[0088] C03: Calculate the average value of the point light transmittance refractive loss rate value TDS r to obtain the light transmittance refractive loss rate TGS of the optical protective film;

[0089] Then, compare the light transmittance refractive loss rate TGS with the light transmittance refractive loss rate threshold Tghg:

[0090] If the light transmittance refractive loss rate TGS is greater than or equal to the light transmittance refractive loss rate threshold Tghg, generate an unqualified permeation refraction signal;

[0091] If the light transmittance refractive loss rate TGS is less than the light transmittance refractive loss rate threshold Tghg, generate a qualified permeation refraction signal;

[0092] After detecting the waterproof properties of the optical protection film both inside and outside, when water penetration occurs in the optical protection film, further measure whether the light transmission and refraction performance is abnormal to avoid changes in the light transmission and refraction performance caused by water penetration during the use of the optical protection film;

[0093] Step 4: Based on the penetration and refraction qualified signal, conduct a moisture penetration conductivity test on the optical protection film, calculate and obtain the resistivity state performance value DZb of the optical protection film, and compare the resistivity state performance value DZb with the resistivity qualified value DZhg to obtain the optical protection film qualified signal;

[0094] Among them, the calculation method of the resistivity state performance value DZb of the optical protection film includes the following steps:

[0095] W1: Cut the optical protection film under the penetration and refraction qualified signal into several single strips of protection film with a length value of a and a width value of b, and mark the single strips of protection film as j, where j is 1, 2, 3...; Conduct a conductivity test on each single strip of protection film, measure the resistance value of each single strip of protection film, and mark it as R j ;

[0096] W2: Calculate and obtain the resistivity value DL of each single strip of protection film through ; j ;

[0097] W3: Calculate the average value of the resistivity values to obtain the average resistivity value DLZ of the single strip, and then calculate the standard deviation of the resistivity values to obtain the resistivity standard deviation DLC of the single strip of protection film;

[0098] Then calculate and obtain the resistivity state performance value DZb through ;

[0099] Compare the resistivity state performance value DZb with the resistivity qualified value DZhg:

[0100] If the resistivity state performance value DZb is greater than the resistivity qualified value DZhg, generate an optical protection film qualified signal;

[0101] If the resistivity state performance value DZb is less than or equal to the resistivity qualified value DZhg, generate an optical protection film unqualified signal;

[0102] By randomly sampling the optical protective films in a batch, first detecting the hydrophobicity of the surface of the optical protective film, measuring and calculating the contact angle of water droplets on the flat and stable surface of the optical protective film, and then judging whether the hydrophobicity of the surface of the optical protective film meets the requirements, the waterproof property of the surface of the optical protective film can be effectively evaluated. Then, by constructing a sealed test chamber for penetration testing and calculating the water penetration rate, the quantification of the penetration performance of the optical protective film can be achieved, and the internal waterproof performance of the optical protective film can be accurately evaluated. In addition, after the penetration test, directly evaluate the loss during the light transmission process of the optical protective film and calculate it, further measure and determine the influence of the optical protective film on light during the process of water penetration. Finally, when water penetration occurs in the optical protective film, conduct a resistivity test to judge the waterproof and insulating performance of the optical protective film, and further evaluate the conductivity of the optical protective film to avoid the situation that the resistivity decreases during the application of the optical protective film and affects its use.

[0103] Example Two: Refer to Figure 2 As shown, this example provides a waterproof detection system for an optical protective film, including:

[0104] Hydrophobic Detection Module: Conduct a water droplet contact angle test on the optical protective film, measure and calculate to obtain the water droplet contact angle SJA on the surface of the optical protective film, compare the water droplet contact angle SJA with the qualified value SJhg of the water droplet contact angle, and obtain a hydrophobic qualified signal;

[0105] Penetration Detection Module: Based on the hydrophobic qualified signal, construct a sealed test chamber for differential pressure humidity penetration testing, calculate to obtain the water penetration rate value STA of the optical protective film, compare it with the water penetration rate threshold SThg, and obtain a water penetration rate qualified signal;

[0106] Light Transmittance Detection Module: Based on the water penetration rate qualified signal, take the optical protective film after differential pressure humidity penetration testing, conduct a light transmittance refractive index test, calculate to obtain the light transmittance refractive loss rate TGS of the optical protective film, compare it with the light transmittance refractive loss rate threshold TGhg, and obtain a penetration refraction qualified signal;

[0107] Conductivity Detection Module: Based on the penetration refraction qualified signal, conduct a moisture penetration conductivity test on the optical protective film, calculate to obtain the resistivity state performance value DZb of the optical protective film, compare the resistivity state performance value DZb with the resistivity qualified value DZhg, and obtain an optical protective film qualified signal.

[0108] The above has described in detail an embodiment of the present invention, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A method for detecting the water resistance of an optical protective film, characterized in that: include: Step 1: Perform a water drop contact angle test on the optical protective film, calculate and obtain the water drop contact angle SJA on the surface of the optical protective film, compare the water drop contact angle SJA with the qualified value SJhg of the water drop contact angle, and obtain a hydrophobic qualified signal; The process of testing and calculating the water drop contact angle on the surface of the optical protective film includes: A01: Place the optical protective film flat on a horizontal test bench, divide the surface of the optical protective film into grids with unit length e, take any unit grid as the coordinate origin, then establish a grid coordinate system, and mark the coordinates of each grid area as (x, y); A02: Select several qualified test grid areas and mark them as r, where r is 1, 2, 3, etc., drop water on each qualified test grid area on the optical protective film, measure and determine the contact angle between the water drop on each qualified test grid area and the optical protective film, and record it as the contact angle value CTA r ; A03: All the contact angle values ​​of the qualified test grid area CTA r Perform mean calculation to obtain the water drop contact angle SJA; The qualified test grid area is selected in the following manner: Get the surface height value of the optical protective film at the center point of the grid area (x, y), recorded as H （x，y） , and simultaneously obtain the surface height values ​​of the center points of the eight adjacent grid areas of the grid area (x, y); Calculate the height difference between the center point of the grid area (x, y) and the center points of the eight adjacent grid areas respectively, and obtain the maximum height difference, which is recorded as HCax （x，y） ; If the maximum height difference HCax （x，y） If the height difference is less than or equal to the height difference threshold, the grid area (x, y) is a qualified test grid area; Step 2: Based on the hydrophobic qualified signal, a sealed test chamber is constructed to perform a differential pressure humidity penetration test, the water permeability value STA of the optical protective film is calculated, and compared with the water permeability threshold SThg to obtain a water permeability qualified signal; Step 3: Based on the qualified water permeability signal, take the optical protective film after the different pressure and humidity permeability test, perform a transmittance refractive index test, calculate the transmittance refractive index loss rate TGS of the optical protective film, and compare it with the transmittance refractive index loss rate threshold TGhg to obtain a permeability refractive index qualified signal; Step 4: Based on the qualified penetration refraction signal, perform a moisture penetration conductivity test on the optical protective film, calculate the resistivity state performance value DZb of the optical protective film, and compare the resistivity state performance value DZb with the qualified resistivity value DZhg to obtain a qualified signal for the optical protective film.

2. The method for detecting the water resistance of an optical protective film according to claim 1, characterized in that: The contact angle between the water droplet and the optical protective film in the grid area is determined as follows: A water drop is dropped on the qualified test grid area r on the optical protective film, and a line is drawn from the center point of the qualified test grid area r where the water drop is located to the center points of the eight adjacent grid areas to determine the contact angle measurement point of the water drop, and eight contact angle values ​​of the water drop in the qualified test grid area r are measured; The eight contact angle values ​​are averaged to obtain the average contact angle of the qualified test grid area r. The contact angle value closest to the average contact angle among the eight contact angle values ​​is taken and recorded as the contact angle value CTA of the qualified test grid area r. r .

3. The method for detecting the water resistance of an optical protective film according to claim 1, characterized in that: The test calculation steps of the water permeability value STA include: B01: Construct a sealed test chamber, obtain the air pressure values ​​in the high humidity test chamber and the dry test chamber at each detection time node, and record them as the high humidity air pressure value HYC i And dry air pressure value LYC i ; B02: The detection period T is set to the unit time t as the detection time interval, and each detection time node is marked as i, where i is 1, 2, 3, etc.; Get the total water permeability value at each detection time node and mark it as QW i ; B03: Obtain the basic test data of the optical protective film test, including the protective film thickness value DH and the protective film area value SM; pass Calculate the water permeability value SP at each detection time node i Obtain a water permeability value set within a detection period T; The maximum water permeability value in the water permeability value set is obtained and recorded as the water permeability value STA.

4. The method for detecting the water resistance of an optical protective film according to claim 3, characterized in that: The sealed test chamber is constructed by fixing an optical protective film in the middle of the sealed chamber to divide the sealed test chamber into two test chambers, injecting humidity into any one of the test chambers, and marking the test chamber as a high-humidity test chamber, and marking the other test chamber as a dry test chamber.

5. The method for detecting the water resistance of an optical protective film according to claim 4, characterized in that: The air pressure value in the high humidity test chamber is higher than the air pressure value in the dry test chamber, and the temperatures in the high humidity test chamber and the dry test chamber are the same.

6. The method for detecting the water resistance of an optical protective film according to claim 1, characterized in that: The calculation method of the light transmission refraction loss rate of the optical protective film is: C01: Take the optical protective film after the differential pressure humidity penetration test, use the test light source with light intensity QR to illuminate the center points of several qualified test grid areas on the protective film, and then obtain the transmitted light intensity of the center point of each qualified test grid area, recorded as TG r ; pass Calculate the transmittance value TL of the center point of each qualified test grid area r ; C02: Obtain the initial transmittance value TS of the optical protective film by Calculate the point transmittance refraction loss value TDS of the optical protective film r ; C03: Point transmittance refraction loss value TDS r The average value is calculated to obtain the light transmission refraction loss rate TGS of the optical protective film.

7. The method for detecting the water resistance of an optical protective film according to claim 1, characterized in that: The calculation method of the resistivity state performance value DZb of the optical protective film includes the following steps: W1: Cut the optical protective film with qualified penetration refraction signal with length a and width b to obtain several protective film strips, and mark the protective film strips as j, where j is 1, 2, 3, etc.; test the conductivity of each protective film strip, test the resistance value of each protective film strip, and mark it as R j ; W2: Pass Calculate the resistivity value DL of each protective film strip j , DH is the thickness of the protective film; W3: Calculate the average value of the resistivity value to obtain the single strip resistivity mean value DLZ, and then calculate the standard deviation of the resistivity value to obtain the resistivity standard deviation value DLC of a single strip of the protective film; Then pass The resistivity state performance value DZb is obtained by calculation.

8. A waterproofness detection system for an optical protective film, characterized in that: The system is used to perform the waterproof detection method as described in any one of claims 1 to 7, comprising: Hydrophobic detection module: Perform water drop contact angle test on the optical protective film, calculate and obtain the water drop contact angle SJA on the surface of the optical protective film, compare the water drop contact angle SJA with the qualified value SJhg of the water drop contact angle, and obtain a hydrophobic qualified signal; Permeation detection module: Based on the hydrophobic qualified signal, a sealed test chamber is constructed to perform a differential pressure humidity penetration test, the water permeability value STA of the optical protective film is calculated, and compared with the water permeability threshold SThg to obtain a water permeability qualified signal; Light transmission detection module: Based on the qualified water permeability signal, take the optical protective film after the different pressure and humidity permeability test, perform the light transmission and refractive index test, calculate the light transmission and refractive index loss rate TGS of the optical protective film, and compare it with the light transmission and refractive index loss rate threshold TGhg to obtain the permeability and refractive index qualified signal; Conductive detection module: Based on the qualified penetration refraction signal, the optical protective film is tested for moisture penetration conductivity, the resistivity state performance value DZb of the optical protective film is calculated, and the resistivity state performance value DZb is compared with the resistivity qualified value DZhg to obtain the qualified signal of the optical protective film.

Images