A rapid method for testing the debonding performance of polymer-dispersed liquid crystal films

Abstract

This invention discloses a rapid method for testing the delamination performance of polymer-dispersed liquid crystal films. The method includes: cutting the polymer-dispersed liquid crystal film into a rectangular sample film; placing electrodes on the two short sides of the sample film; rolling the sample film into a cylindrical shape along the short sides and placing it in a circular testing container; leaving it at room temperature for at least 12 hours; removing the sample film, laying it flat, and measuring the delamination length and width at the electrodes. In this invention, the polymer-dispersed liquid crystal film is cut into a rectangular sample film, then rolled into a cylindrical shape along the short side electrodes and placed in a testing container. After leaving it at room temperature for at least 12 hours, the sample film is removed, laid flat, and the delamination length and width at the electrodes are measured and recorded. This invention utilizes the stretching tension during film rolling to change the adhesion between the liquid crystal layer and the conductive layer of the polymer-dispersed liquid crystal film in a short time, achieving rapid detection.

Description

Technical Field

[0001] This invention relates to a method for detecting delamination of liquid crystal films, and more specifically, to a rapid method for testing the delamination performance of polymer-dispersed liquid crystal films. Background Technology

[0002] US Patent 4671618 discloses a method for fabricating a phase-separated polymer-dispersed liquid crystal (PDLC). This method can be used to fabricate polymer-dispersed liquid crystal films and PALC films, collectively referred to as PDLC films. A PDLC film includes a liquid crystal-plastic core layer and two transparent conductive film surface layers, which are disposed on both sides of the liquid crystal-plastic core layer. PDLC films can be used to fabricate a series of derivative products such as smart glass, magic glass, electrochromic liquid crystal frosted glass, and smart glass. PDLC films and their derivatives are a novel material. These products can adjust the change between transmission and scattering of incident light by controlling the on / off state of the applied voltage, thereby controlling the product's state between transparent and frosted (frosted glass state). They possess a dual function of transparency and concealment, and have increasingly wide applications. During long-term use and transportation, PDLC films and their derivative products may experience delamination between the liquid crystal-plastic core layer and the transparent conductive film layer. This delamination manifests as long strips or dots at the edges, approximately 2mm wide; one side is white, while the other is reflective; under electrical conditions, it appears semi-transparent or even fogged. With continued use and storage, this delamination can further extend inwards. This defect severely impacts the product's lifespan and appearance, and while it is currently somewhat unavoidable, it remains a significant problem.

[0003] Chinese Patent 201010136040 discloses a method for detecting the delamination performance of polymer-dispersed liquid crystal films. This method uses a damp heat aging process to accelerate changes in the properties of the polymer-dispersed liquid crystal film, accelerating the aging of the adhesive layer and moisture penetration. Then, the delamination phenomenon of the polymer-dispersed liquid crystal film is examined under specified conditions to determine its weather resistance in a damp heat environment. The method uses a steady-state damp heat chamber, placing the polymer-dispersed liquid crystal film sample or its derivatives in the chamber for aging treatment. After aging, the sample is removed, and the length and width of the delamination at the edge of the sample are manually measured. The aging time is 45-50 hours, the temperature is 55℃-65℃, and the humidity is 90%-99%. This method can partially detect delamination problems in polymer-dispersed liquid crystal films, but it cannot completely detect them. Furthermore, the process is time-consuming, and simultaneous comparative testing of liquid crystal film and dimming glass samples is required, making it cumbersome and subject to stringent conditions. Therefore, it is not suitable for detecting the delamination of polymer-dispersed liquid crystal films.

[0004] With the in-depth development and widespread application of polymer-dispersed liquid crystal films and their derivative products such as dimming glass, manufacturers and users are paying increasing attention to the severity of delamination. Therefore, a method is needed to quickly detect the delamination performance of polymer-dispersed liquid crystal films, so that manufacturers can verify the delamination problem in advance when designing formulations, improve formulations, ensure that the formulations put into use are free of delamination problems, and ensure that the products produced are free of delamination risk in subsequent processing, thereby improving the product yield, reducing costs and reducing product risks for enterprises. Summary of the Invention

[0005] To address the aforementioned deficiencies in the prior art, this invention provides a rapid method for testing the delamination performance of polymer-dispersed liquid crystal films.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a rapid testing method for the delamination performance of polymer-dispersed liquid crystal films, the testing method comprising:

[0007] The polymer-dispersed liquid crystal film was cut into rectangular sample films;

[0008] Electrodes are placed on the two short sides of the sample membrane;

[0009] Starting from the short side of the sample membrane, roll it up into a cylindrical shape and place it inside the circular detection container;

[0010] After being left at room temperature for more than 12 hours, the sample membrane was removed, laid flat, and the length and width of the delamination at the electrode were measured.

[0011] In the rapid testing method for the delamination performance of polymer-dispersed liquid crystal films described in this invention, the width of the sample film is 50mm-2000mm, and the length of the sample film is 50mm-3000mm.

[0012] In the rapid testing method for the delamination performance of polymer-dispersed liquid crystal films described in this invention, the diameter of the testing barrel is 30-150 mm, and the depth of the testing barrel is greater than the width of the sample film.

[0013] In the rapid testing method for the delamination performance of polymer-dispersed liquid crystal films described in this invention, the testing barrel is made of PVC material, or the testing barrel is made of paper material, or the testing barrel is made of metal material, or the testing barrel is made of plastic material.

[0014] In the rapid testing method for the delamination performance of polymer-dispersed liquid crystal films described in this invention, the wall thickness of the testing container is greater than or equal to 0.1 mm.

[0015] In the rapid testing method for the delamination performance of polymer-dispersed liquid crystal films described in this invention, the width of the electrode is 3-20 mm.

[0016] The rapid testing method for the delamination performance of polymer-dispersed liquid crystal films according to the present invention has the following beneficial effects: When using the testing method of the present invention, the polymer-dispersed liquid crystal film is cut into a rectangular sample film. Then, the sample film is rolled into a cylindrical shape along the short side electrode and placed in a testing container. It is left at room temperature for more than 12 hours. The sample film is then removed, laid flat, and the length and width of the delamination at the electrode are measured and recorded, thus achieving rapid detection of delamination in the polymer-dispersed liquid crystal film. The present invention employs a manual rolling and placement method, utilizing the stretching tension during film rolling to change the adhesion between the liquid crystal layer and the conductive layer of the polymer-dispersed liquid crystal film in a short time, achieving rapid detection. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a sample film in a polymer-dispersed liquid crystal film for rapid testing according to the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the sample film and detection container in the rapid testing of polymer-dispersed liquid crystal films according to the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] like Figure 1-2 As shown, in the first embodiment of the rapid testing method for the debonding performance of polymer-dispersed liquid crystal films of the present invention, the testing method includes:

[0022] Step S101: Cut the polymer-dispersed liquid crystal film into a rectangular sample film;

[0023] Step S102: Electrodes 11 are placed on the two short sides of the sample film;

[0024] Step S103: Start rolling up the sample membrane along its short side and roll it into a cylindrical shape and place it in the circular detection container 12;

[0025] Step S104: After placing the sample film at room temperature for more than 12 hours, take it out, lay it flat, and measure the length and width of the delamination at electrode 11.

[0026] When using the detection method of this invention, the polymer-dispersed liquid crystal film is cut into a rectangular sample film. Then, the sample film 10 is rolled into a cylindrical shape along the short side electrode 11 and placed in the detection container 12. It is left at room temperature for more than 12 hours. The sample film is then taken out, laid flat, and the length and width of the delamination at the electrode 11 are measured and recorded, thus achieving rapid detection of delamination of the polymer-dispersed liquid crystal film. This invention uses a manual rolling and placement method, utilizing the stretching tension during film rolling, which can change the adhesion between the liquid crystal layer and the conductive layer of the polymer-dispersed liquid crystal film in a short time, achieving rapid detection.

[0027] This invention rapidly assesses the delamination performance of polymer-dispersed liquid crystal films based on their delamination status, providing a reference for their use and storage. This allows for targeted measures to be taken to improve product lifespan.

[0028] In this embodiment, the sample membrane 10 has a width of 600mm-1000mm and a length of 600mm-1000mm. Preferably, the sample membrane 10 has a width of 600mm and a length of 800mm.

[0029] Furthermore, the diameter of the detection barrel 12 is 30-150 mm, and the depth of the detection barrel 12 is greater than the width of the sample membrane 10. Preferably, the smaller the diameter of the detection barrel 12, the faster the adhesive separation time, the larger the separation size, and the simpler, more convenient, and more effective the experiment.

[0030] Furthermore, the testing barrel 12 may be made of PVC material, or the testing barrel 12 may be made of paper material, or the testing barrel 12 may be made of metal material, or the testing barrel 12 may be made of plastic material.

[0031] Specifically, the wall thickness of the testing barrel 12 is greater than or equal to 0.1 mm. The width of the electrode 11 is 3-20 mm.

[0032] Furthermore, in this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for rapidly testing the debonding performance of a polymer dispersed liquid crystal film, characterized in that, The detection method includes: The polymer-dispersed liquid crystal film was cut into rectangular sample films; Electrodes are disposed on the two short sides of the sample membrane; Starting from the short side of the sample membrane, roll it up into a cylindrical shape and place it inside the circular detection container; After being left at room temperature for more than 12 hours, the sample membrane was removed, laid flat, and the length and width of the delamination at the electrodes were measured. The sample membrane has a width of 50mm-2000mm and a length of 50mm-3000mm. The diameter of the detection barrel is 30-150mm, and the depth of the detection barrel is greater than the width of the sample membrane; The testing barrel is made of PVC material, or the testing barrel is made of paper material, or the testing barrel is made of metal material, or the testing barrel is made of plastic material.

2. The method of claim 1, wherein the method is characterized by, The wall thickness of the testing barrel is greater than or equal to 0.1 mm.

3. The method of claim 1, wherein the method is characterized by, The width of the electrode is 3-20 mm.

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