Preparation process of coating type color-changing TPU color-changing film

Abstract

The application discloses a preparation process of a coating type color-changing TPU color-changing film, and adopts microcapsule repair technology, specifically, through the addition of a repair agent and microcapsule material, the TPU film has self-repairing function, can repair itself when damaged, and prolongs the service life and stability of the film; the TPU film prepared by the preparation process can dynamically change color according to the stimulating environment, and has self-repairing performance, and is suitable for various application scenarios, such as temperature, illumination or pressure change monitoring and display; the preparation device used in the process has self-adaptive adjustment function, specifically, through the use of adjusting connecting rods, sensors and other devices, the thickness of the paint, the scraping force and the suction force can be monitored and adjusted in real time, and the flexibility and accuracy of the production process are improved; through the adoption of a continuous process, the thickness of the paint is detected and adjusted through circulation, and efficient production and quality control are realized.

Description

Technical Field

[0001] This invention relates to the field of technology, and in particular to a process for preparing a coating-type color-changing TPU film. Background Technology

[0002] Patent CN109868073A discloses a color-changing film with self-healing function, which is composed of a pressure-sensitive adhesive layer, a color coating layer, a thermoplastic polyurethane film, and a thermosetting polyurethane coating layer stacked from bottom to top. Patent CN114163940A discloses a thermoplastic polyurethane elastomer color-changing film and its preparation method, which includes a first release film layer, a pressure-sensitive adhesive layer, a first substrate layer, a color layer, and a second substrate layer from top to bottom. In the color-changing films of the above patents, the color adhesive layer and the TPU film are directly bonded, but the bonding effect between the two is relatively weak, and they are prone to detachment, which affects the overall performance of the color-changing film.

[0003] In the existing TPU color-changing film manufacturing process, the coating equipment mostly uses a scraper to remove excess coating from the film surface to solve the problem of uneven coating. However, over long-term use, residual material gradually accumulates on the scraper, requiring periodic shutdowns for cleaning to ensure the machine remains clean, thus reducing production efficiency and continuous operating time. Furthermore, due to the uneven coating problem, the scraping force also needs to be adjusted accordingly. Existing equipment struggles to monitor waste accumulation in real time and automatically adjust the scraping force as needed, hindering intelligent waste handling and equipment management. Improvements are needed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Therefore, to solve the above-mentioned technical problems, the present invention provides the following technical solution: a coating-type color-changing TPU film preparation process, which uses a preparation device including a main body, a thickness measuring mechanism, a scraping mechanism, and a suction mechanism, and the preparation process includes the following steps:

[0006] S1: TPU precursor is synthesized by polymerizing diisocyanate and polyether polyol, and the synthesized TPU precursor is dissolved in solvent to form TPU solution;

[0007] S2: Mix the repair agent and microcapsule material, add emulsifier, and stir; disperse the mixture in the aqueous phase during stirring to form a microcapsule suspension; filter, wash the microcapsule suspension, and dry it to obtain microcapsules encapsulated with the repair agent;

[0008] S3: Add color-changing molecules and microcapsules to the TPU solution, unwind the TPU film through the unwinding roller, and then coat the TPU solution evenly on the flat film through the coating nozzle; the coated film is pressed by the unwinding pressure roller and then conveyed to the drying guide roller, and then enters the drying oven for drying and curing.

[0009] S31: When the film passes between the unwinding pressure roller and the drying guide roller, the measuring roller comes into contact with the coating on the film surface. When the coating is thick, the measuring roller moves backward and pushes the adjusting linkage to rotate through the measuring push rod.

[0010] S32: While the top of the adjusting rod rotates, it pushes the scraper rod to press down the first spring. The scraper rod drives the adaptive scraper to slide horizontally on the scraper guide rail and gradually approach the film. The scraping force is adjusted, and the scraper part scrapes the coating on the film to the receiving part.

[0011] S33: When the measuring roller moves backward, the adjusting rod moves away from the film, and the length of the second spring is extended, causing the suction rod to push the piston cylinder to move in the same direction. At the same time, the sensor sends a signal to the controller to start the first motor, which drives the eccentric wheel to rotate. The eccentric wheel drives the telescopic rod to rotate, and the third spring on the telescopic rod pushes the movable rod to move upward in the telescopic cylinder, so that the displacement of the telescopic rod in the piston cylinder becomes longer, the suction force increases, and it can meet the needs of scraping off excessively thick coatings. The longer telescopic rod pushes the telescopic piston rod to move in the piston cylinder, creating a negative pressure environment in the piston cylinder, and then sucking the coating on the receiving part into the collection tank through the suction hole.

[0012] S34: Repeat the above steps to detect the thickness of the coating, and adjust the scraping force and suction force of the coating in real time to improve the flexibility and practicality of the equipment.

[0013] S35: After the film processing is completed, turn on the power of the second motor so that the second motor drives the ball screw to rotate. The ball screw is connected to the adjusting slide through mechanical transmission to control the adaptive bracket to move backward, so that the scraping mechanism and the suction mechanism are moved backward and the thickness measuring mechanism is exposed.

[0014] S4: Place the TPU film in various stimulating environments such as temperature, light, or pressure to test and characterize the TPU film and evaluate its dynamic color change and self-healing properties.

[0015] The main structure includes an unwinding roller, an unwinding pressure roller, a drying guide roller, and a take-up roller connected to the TPU film;

[0016] The thickness measuring mechanism is arranged between the unwinding pressure roller and the drying guide roller. The thickness measuring mechanism includes a measuring roller, a measuring push rod and an adjusting link. The measuring push rod is arranged on the rear side of the measuring roller. One end of the measuring push rod is movably connected to the measuring roller and the other end is movably connected to the adjusting link.

[0017] The scraping mechanism is arranged on the feed side of the drying guide roller. The scraping mechanism includes an adaptive scraper, a scraper guide rail and a scraper connecting rod. The adaptive scraper is horizontally slidably connected to the scraper guide rail and movably connected to the top end of the scraper connecting rod. The scraper connecting rod is sleeved on the top end of the adjusting connecting rod and is slidably connected to the adjusting connecting rod up and down through a first spring.

[0018] The suction mechanism includes a vacuum suction assembly and a suction rod. The bottom end of the suction rod is movably connected to the vacuum suction assembly, and the top end of the suction rod is sleeved on the bottom of the adjusting rod. The suction rod is slidably connected to the adjusting rod up and down by a second spring.

[0019] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: two sets of drying guide rollers are provided, a drying box is arranged between the two sets of drying guide rollers, and a paint spray head is arranged between the unwinding roller and the unwinding pressure roller.

[0020] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, the adaptive scraper includes an integrated scraper part and a receiving part, the scraper part is arranged at the top of the receiving part, and the bottom of the receiving part is connected to the suction component through a pipe.

[0021] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: the receiving part is a hollow structure design, the side of the receiving part near the drying guide roller is an arc-shaped structure, and a suction-density hole is opened on the arc surface.

[0022] As a preferred embodiment of the coating-type color-changing TPU film preparation process of the present invention, the vacuum suction assembly includes a telescopic connecting rod, a telescopic piston rod, and a piston cylinder. The upper and lower ends of the telescopic connecting rod are respectively movably connected to the telescopic piston rod and an eccentric wheel, and the eccentric wheel is connected to a first motor. The other end of the telescopic piston rod is connected to a piston head, which is arranged inside the piston cylinder and is slidably connected to the piston cylinder. The feed end of the piston cylinder is connected to a scraper through a pipe, and the discharge port of the piston cylinder is connected to a collection tank through a pipe.

[0023] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, the telescopic connecting rod includes a telescopic cylinder, a movable connecting rod and a third spring. One end of the movable connecting rod is movably connected to the telescopic piston rod, and the other end is fixedly connected to the third spring. The third spring is fixed inside the telescopic cylinder, and the piston connecting rod is slidably connected to the telescopic cylinder up and down.

[0024] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: a guide slide is connected to the piston cylinder, the guide slide is horizontally slidably connected to the guide slide rail, the guide slide rail is fixed on the adaptive bracket, and a movable connecting seat is also arranged on the adaptive bracket, and the adjusting connecting rod is rotatably connected to the movable connecting seat.

[0025] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: the first motor is connected to a motor base, the motor base is fixed on one side of the collection tank, the other side of the collection tank is connected to an adaptive bracket, the adaptive bracket is also fixedly connected to the scraper guide rail, a sensor for detecting and measuring the displacement of the push rod is arranged on the adaptive bracket, the sensor is connected to a controller, and the controller is connected to the first motor.

[0026] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: the adaptive bracket is arranged on the front side of the main body, an adjusting slide is connected to the adaptive bracket, the adjusting slide is slidably connected to an adaptive slide rail, and the adaptive slide rail is arranged below the adaptive bracket.

[0027] As a preferred embodiment of the coating-type color-changing TPU color-changing film preparation process of the present invention, wherein: the adjusting slide is connected to a ball screw, the ball screw is rotatably installed in an adaptive slide rail, and the ball screw is connected to a second motor.

[0028] The beneficial effects of this invention are:

[0029] 1. The coating-type color-changing TPU film preparation process proposed in this invention adopts microcapsule repair technology. Specifically, by adding repair agents and microcapsule materials, the TPU film has a self-healing function, which can repair itself when damaged, thus extending the service life and stability of the film. The TPU film prepared by this process can dynamically change color according to the stimulation environment and has self-healing properties, making it suitable for various application scenarios, such as monitoring and displaying changes in temperature, light, or pressure.

[0030] 2. The coating-type color-changing TPU film preparation process proposed in this invention utilizes a preparation device with adaptive adjustment capabilities. Specifically, by using adjusting linkages and sensors, real-time monitoring and adjustment of coating thickness, scraping force, and suction force are achieved, improving the flexibility and accuracy of the production process. Through a continuous process, the coating thickness is repeatedly detected and adjusted, achieving efficient production and quality control. These technological advantages and effects enable this preparation process to achieve high-quality, high-efficiency production, producing color-changing TPU films with multifunctional properties suitable for a wide range of applications. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the specific structure of the present invention.

[0034] Figure 3 This is a partial front view structural diagram of the present invention.

[0035] Figure 4 This is a schematic diagram of the installation structure of the thickness measuring mechanism of the present invention.

[0036] Figure 5 This is a schematic diagram of the scraping mechanism of the present invention.

[0037] Figure 6 This is a cross-sectional view of the suction mechanism of the present invention.

[0038] In the diagram: 100, main structure; 101, unwinding roller; 102, unwinding pressure roller; 103, drying guide roller; 104, winding roller; 105, drying box; 106, paint nozzle;

[0039] 200. Thickness measuring mechanism; 201. Measuring roller; 202. Measuring push rod; 203. Adjusting connecting rod;

[0040] 300. Scraping mechanism; 301. Adaptive scraper; 3011. Scraper section; 3012. Receiving section; 3013. Suction well; 302. Scraper guide rail; 303. Scraper connecting rod; 304. First spring;

[0041] 400. Suction mechanism; 401. Suction connecting rod; 402. Second spring; 403. Telescopic connecting rod; 4031. Telescopic cylinder; 4032. Movable connecting rod; 4033. Third spring; 404. Telescopic piston rod; 4041. Piston head; 405. Piston cylinder; 406. Eccentric wheel; 407. First motor; 408. Collection tank; 409. Motor base; 410. Guide rail; 411. Guide slide block;

[0042] 500, Adaptive bracket; 501, Adaptive slide rail; 502, Second motor; 503, Ball screw. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0046] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0047] Reference Figures 1-6 As an embodiment of the present invention, a coating-type color-changing TPU color-changing film preparation process is provided. The preparation process uses a preparation device, which includes a main body 100, a thickness measuring mechanism 200, a scraping mechanism 300, and a suction mechanism 400.

[0048] The main structure 100 includes an unwinding roller 101, an unwinding pressure roller 102, a drying guide roller 103, and a take-up roller 104 connected to a TPU film; the drying guide roller 103 is provided in two sets, and a drying box 105 is arranged between the two sets of drying guide rollers 103; a paint spray nozzle 106 is arranged between the unwinding roller 101 and the unwinding pressure roller 102.

[0049] The thickness measuring mechanism 200 is arranged between the unwinding pressure roller 102 and the drying guide roller 103. The thickness measuring mechanism 200 includes a measuring roller 201, a measuring push rod 202, and an adjusting connecting rod 203. The measuring push rod 202 is arranged behind the measuring roller 201, with one end movably connected to the measuring roller 201 and the other end movably connected to the adjusting connecting rod 203. At the feeding side of the drying guide roller 103, the scraping mechanism 300 includes an adaptive scraper 301, a scraper guide rail 302, and a scraper connecting rod 303. The adaptive scraper 301 is horizontally slidably connected to the scraper guide rail 302. 01 is movably connected to the top of the scraper connecting rod 303, which is sleeved on the top of the adjusting connecting rod 203. The scraper connecting rod 303 is slidably connected to the adjusting connecting rod 203 via the first spring 304. The adaptive scraper 301 includes an integral scraper part 3011 and a receiving part 3012. The scraper part 3011 is arranged at the top of the receiving part 3012, and the bottom of the receiving part 3012 is connected to the suction assembly via a pipe. The receiving part 3012 has a hollow structure design. The side of the receiving part 3012 near the drying guide roller 103 is an arc-shaped structure, and a suction well hole 3013 is opened on the arc surface.

[0050] The suction mechanism 400 includes a vacuum suction assembly and a suction rod 401. The bottom end of the suction rod 401 is movably connected to the vacuum suction assembly, and the top end of the suction rod 401 is sleeved on the bottom of the adjusting rod 203. The suction rod 401 is slidably connected to the adjusting rod 203 via a second spring 402. The vacuum suction assembly includes a telescopic rod 403, a telescopic piston rod 404, and a piston cylinder 405. The upper and lower ends of the telescopic rod 403 are movably connected to the telescopic piston rod 405. The piston rod 404 and the eccentric wheel 406 are connected, with the eccentric wheel 406 connected to a first motor 407; the other end of the telescopic piston rod 404 is connected to a piston head 4041, which is arranged inside the piston cylinder 405 and is slidably connected to the piston cylinder 405; the feed end of the piston cylinder 405 is connected to a scraper through a pipe, and the discharge port of the piston cylinder 405 is connected to a collection tank 408 through a pipe; the telescopic connecting rod 403 includes a telescopic cylinder 4031, a movable connecting rod 4032, and a third... Spring 4033, one end of movable connecting rod 4032 is movably connected to telescopic piston rod 404, and the other end is fixedly connected to third spring 4033. Third spring 4033 is fixed inside telescopic cylinder 4031. Piston connecting rod and telescopic cylinder 4031 are slidably connected up and down. Guide slide 411 is connected to piston cylinder 405. Guide slide 411 is horizontally slidably connected to guide slide rail 410. Guide slide rail 410 is fixed on adaptive bracket 500. Adaptive bracket 500 is also provided with movable connecting seat. Adjusting connecting rod 203 is rotatably connected to movable connecting seat. First motor 407 is connected to motor base 409. Motor base 409 is fixed on one side of collection tank 408. The other side of collection tank 408 is connected to adaptive bracket 500. Adaptive bracket 500 is also fixedly connected to scraper guide rail 302. Sensor for detecting and measuring displacement of push rod 202 is arranged on adaptive bracket 500. Sensor is connected to controller. Controller is connected to first motor 407.

[0051] The adaptive bracket 500 is arranged on the front side of the main body 100. An adjusting slide is connected to the adaptive bracket 500. The adjusting slide is slidably connected to the adaptive slide rail 501, which is arranged below the adaptive bracket 500. The adjusting slide is connected to a ball screw 503, which is rotatably installed in the adaptive slide rail 501. The ball screw 503 is connected to a second motor 502.

[0052] The preparation process of the coating-type color-changing TPU film prepared by the above-mentioned preparation apparatus includes the following steps:

[0053] S1: TPU precursor is synthesized by polymerizing diisocyanate and polyether polyol, and the synthesized TPU precursor is dissolved in solvent to form TPU solution;

[0054] S2: Mix the repair agent and microcapsule material, add emulsifier, and stir; disperse the mixture in the aqueous phase during stirring to form a microcapsule suspension; filter, wash the microcapsule suspension, and dry it to obtain microcapsules encapsulated with the repair agent;

[0055] S3: Add color-changing molecules and microcapsules to the TPU solution, unwind the TPU film through the unwinding roller 101, and then uniformly coat the TPU solution onto the flat film through the coating nozzle 106; the coated film is rolled by the unwinding pressure roller 102 and then conveyed to the drying guide roller 103, and then enters the drying box 105 for drying and curing.

[0056] S31: When the film passes between the unwinding pressure roller 102 and the drying guide roller 103, the measuring roller 201 contacts the coating on the film surface. When the coating is thick, the measuring roller 201 moves backward and pushes the adjusting linkage 203 to rotate through the measuring push rod 202.

[0057] S32: While the top of the adjusting rod 203 rotates, the scraper rod 303 is pushed down to press the first spring 304. The scraper rod 303 drives the adaptive scraper 301 to slide horizontally on the scraper guide rail 302 and gradually approach the film. The scraping force is adjusted, and the coating on the film is scraped off to the receiving part 3012 through the scraper part 3011.

[0058] S33: When the measuring roller 201 moves backward, the adjusting rod 203 moves away from the film, and the length of the second spring 402 is extended, so that the suction rod 401 pushes the piston cylinder 405 to move in the same direction. At the same time, the sensor sends a signal to the controller to start the first motor 407, so that the first motor 407 drives the eccentric wheel 406 to rotate, the eccentric wheel 406 drives the telescopic rod 403 to rotate, and the third spring 4033 on the telescopic rod 403 pushes the movable rod 4032 to move upward in the telescopic cylinder 4031, so that the displacement of the telescopic rod 403 in the piston cylinder 405 becomes longer, the suction force becomes greater, and it can meet the needs of scraping off excessively thick coatings. The longer telescopic rod 403 pushes the telescopic piston rod 404 to move in the piston cylinder 405, creating a negative pressure environment in the piston cylinder 405, and then sucking the coating on the receiving part 3012 into the collection tank 408 through the suction hole 3013.

[0059] S34: Repeat the above steps to detect the thickness of the coating, and adjust the scraping force and suction force of the coating in real time to improve the flexibility and practicality of the equipment.

[0060] S35: After the film processing is completed, turn on the power of the second motor 502, so that the second motor 502 drives the ball screw 503 to rotate, so that the ball screw 503 controls the adaptive bracket 500 to move backward through the mechanical transmission connection with the adjusting slide, so that the scraping mechanism 300 and the suction mechanism 400 are moved backward, and the thickness measuring mechanism 200 is exposed.

[0061] S4: Place the TPU film in various stimulating environments such as temperature, light or pressure to test and characterize the TPU film and evaluate its dynamic color change and self-healing properties.

[0062] S41: TPU film was tested using a temperature-controlled chamber, with a temperature range from -20°C to 80°C.

[0063] S42: TPU film was tested using a UV lamp with a light intensity range from 100mW / cm². 2 Up to 500mW / cm 2 ;

[0064] S43: Test the TPU membrane using a pressure testing machine, with a pressure range from 0.1 MPa to 10 MPa;

[0065] S44: Measure the color change response time of the TPU film using a spectrophotometer;

[0066] S45: Use a scratch tester to measure the self-healing efficiency of the TPU film.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A process for preparing a coating-type color-changing TPU film, characterized in that: The preparation process uses a preparation apparatus, which includes a main body (100), a thickness measuring mechanism (200), a scraping mechanism (300), and a suction mechanism (400). The preparation process includes the following steps: S1: TPU precursor is synthesized by polymerizing diisocyanate and polyether polyol, and the synthesized TPU precursor is dissolved in solvent to form TPU solution; S2: Mix the repair agent and microcapsule material, add emulsifier, and stir; disperse the mixture in the aqueous phase during stirring to form a microcapsule suspension; filter, wash the microcapsule suspension, and dry it to obtain microcapsules encapsulated with the repair agent; S3: Add color-changing molecules and microcapsules to the TPU solution, unwind the TPU film through the unwinding roller (101), and then uniformly coat the TPU solution onto the flat film through the coating nozzle (106); the coated film is rolled by the unwinding pressure roller (102) and then conveyed to the drying guide roller (103), and then enters the drying box (105) for drying and curing; S31: When the film passes between the unwinding pressure roller (102) and the drying guide roller (103), the measuring roller (201) contacts the coating on the surface of the film. When the coating is thick, the measuring roller (201) moves backward and pushes the adjusting linkage (203) to rotate through the measuring push rod (202). S32: While the top of the adjusting rod (203) rotates, the scraper rod (303) is pushed down to press the first spring (304). The scraper rod (303) drives the adaptive scraper (301) to slide horizontally on the scraper guide rail (302) and gradually approach the film. The scraping force is adjusted, and the coating on the film is scraped off to the receiving part (3012) through the scraper part (3011). S33: When the measuring roller (201) moves backward, the adjusting rod (203) moves away from the film, and the length of the second spring (402) is extended, causing the suction rod (401) to push the piston cylinder (405) to move in the same direction; at the same time, the sensor sends a signal to the controller to start the first motor (407), which drives the eccentric wheel (406) to rotate, and the eccentric wheel (406) drives the telescopic rod (403) to rotate, and the third spring (402) on the telescopic rod (403) rotates. 33) The movable connecting rod (4032) is pushed to move upward in the telescopic cylinder (4031), so that the telescopic connecting rod (403) in the piston cylinder (405) becomes longer, the suction force increases, and it can meet the needs of scraping off thick paint. The longer telescopic connecting rod (403) pushes the telescopic piston rod (404) to move in the piston cylinder (405), creating a negative pressure environment in the piston cylinder (405), and then the paint on the receiving part (3012) is sucked into the collection tank (408) through the suction hole (3013); S34: Repeat the above steps to detect the thickness of the coating, and adjust the scraping force and suction force of the coating in real time to improve the flexibility and practicality of the equipment. S35: After the film processing is completed, the power supply of the second motor (502) is turned on, so that the second motor (502) drives the ball screw (503) to rotate, so that the ball screw (503) controls the adaptive support (500) to move to the rear side through the mechanical transmission connection with the adjusting slide, moves the scraping mechanism (300) and the suction mechanism (400) to the rear, and exposes the thickness measuring mechanism (200); S4: Place the TPU film in various stimulating environments, test and characterize the TPU film, and evaluate its dynamic color-changing and self-repairing performance; The main mechanism (100) comprises a unwinding roller (101), a unwinding pressure roller (102), a drying guide roller (103) and a winding roller (104) connected with the TPU film. The thickness measuring mechanism (200) is arranged between the unwinding pressure roller (102) and the drying guide roller (103), and comprises a measuring roller (201), a measuring push rod (202) and an adjusting connecting rod (203). The measuring push rod (202) is arranged at the rear side of the measuring roller (201), one end of the measuring push rod (202) is movably connected with the measuring roller (201), and the other end is movably connected with the adjusting connecting rod (203). The scraping mechanism (300) is arranged at the inlet of the drying guide roller (103), and comprises an adaptive scraper (301), a scraper guide rail (302) and a scraper connecting rod (303). The adaptive scraper (301) is horizontally slidably connected with the scraper guide rail (302), the adaptive scraper (301) is movably connected with the top end of the scraper connecting rod (303), the scraper connecting rod (303) is sleeved at the top end of the adjusting connecting rod (203), and the scraper connecting rod (303) is slidably connected with the adjusting connecting rod (203) through the first spring (304). The suction mechanism (400) comprises a vacuum suction assembly and a suction connecting rod (401). The bottom end of the suction connecting rod (401) is movably connected with the vacuum suction assembly, the top end of the suction connecting rod (401) is sleeved at the bottom of the adjusting connecting rod (203), and the suction connecting rod (401) is slidably connected with the adjusting connecting rod (203) through the second spring (402).

2. The preparation process of the coated color-changing TPU color-changing film according to claim 1, characterized in that: The drying guide roller (103) is provided with two groups, and a drying box (105) is arranged between the two groups of drying guide rollers (103). A coating nozzle (106) is arranged between the unwinding roller (101) and the unwinding pressure roller (102).

3. The preparation process of the coated color-changing TPU color-changing film according to claim 2, characterized in that: The adaptive scraper (301) comprises an integral scraper part (3011) and a material receiving part (3012). The scraper part (3011) is arranged at the top end of the material receiving part (3012), and the bottom of the material receiving part (3012) is communicated with the suction assembly through a pipeline.

4. The preparation process of the coated color-changing TPU color-changing film according to claim 3, characterized in that: The material receiving part (3012) is designed as a hollow structure, one side of the material receiving part (3012) close to the drying guide roller (103) is a circular arc structure, and a suction hole (3013) is formed in the circular arc surface. 5.The preparation process of the coated color-changing TPU color-changing film according to claim 4, characterized in that: The vacuum suction assembly comprises a telescopic connecting rod (403), a telescopic piston rod (404) and a piston cylinder (405), the upper and lower ends of the telescopic connecting rod (403) are movably connected with the telescopic piston rod (404) and an eccentric wheel (406) respectively, the eccentric wheel (406) is connected with a first motor (407); the other end of the telescopic piston rod (404) is connected with a piston head (4041), the piston head (4041) is arranged in the piston cylinder (405) and is slidably connected with the piston cylinder (405) in front and back, the feeding end of the piston cylinder (405) is communicated with the scraper through a pipeline, and the discharging port of the piston cylinder (405) is connected with a material collecting tank (408) through a pipeline. 6.The preparation process of the coated color-changing TPU color-changing film according to claim 5, characterized in that: The telescopic connecting rod (403) comprises a telescopic cylinder (4031), a movable connecting rod (4032) and a third spring (4033), one end of the movable connecting rod (4032) is movably connected with the telescopic piston rod (404), the other end is fixedly connected with the third spring (4033), the third spring (4033) is fixed in the telescopic cylinder (4031), and the piston connecting rod is slidably connected with the telescopic cylinder (4031) in up and down directions.

7. The coating type color conversion TPU color conversion film preparation process according to claim 6, characterized in that: The piston cylinder (405) is connected with a guide sliding seat (411), the guide sliding seat (411) is slidably connected with a guide sliding rail (410), the guide sliding rail (410) is fixed on the self-adaptive support (500), and the self-adaptive support (500) is also provided with a movable connecting seat, and the adjusting connecting rod (203) is rotatably connected with the movable connecting seat.

8. The coating type color conversion TPU color conversion film preparation process according to claim 7, characterized in that: The first motor (407) is connected with a motor base (409), the motor base (409) is fixed on one side of the material collecting tank (408), the other side of the material collecting tank (408) is connected with the self-adaptive support (500), the self-adaptive support (500) is also fixedly connected with the scraper guide rail (302), the self-adaptive support (500) is provided with a sensor for detecting displacement of the measuring push rod (202), the sensor is connected with a controller, and the controller is connected with the first motor (407).

9. The coating type color conversion TPU color conversion film preparation process according to claim 8, characterized in that: The self-adaptive support (500) is arranged on the front side of the main body mechanism (100), the self-adaptive support (500) is connected with an adjusting sliding seat, the adjusting sliding seat is slidably connected with a self-adaptive sliding rail (501), and the self-adaptive sliding rail (501) is arranged below the self-adaptive support (500).

10. The coating type color conversion TPU color conversion film preparation process according to claim 9, characterized in that: The adjusting sliding seat is connected with a ball screw (503), the ball screw (503) is rotatably installed in the self-adaptive sliding rail (501), and the ball screw (503) is connected with a second motor (502).

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