Tungstate-based flexible composite material with multi-mode dynamic color changing characteristic and preparation method of tungstate-based flexible composite material

Abstract

The invention provides a tungstate-based flexible composite material with a multimode dynamic color change characteristic, which comprises an optical function material and a carrier material, the optical function material is tungstate-based fluorescent powder, and the tungstate-based fluorescent powder comprises Li (1-x) YW2O8: xEu (0% lt; xlt; 10%). According to the tungstate-based flexible composite material with the multimode dynamic color changing characteristic and the preparation method of the tungstate-based flexible composite material, a force-induced and light-induced multimode dynamic light-emitting composite material is prepared by mixing a polydimethylsiloxane solution A and a polydimethylsiloxane solution B in proportion and adding a certain amount of fluorescent powder LiYW2O8: Eu < 3 + >, and the tungstate-based flexible composite material with the multimode dynamic color changing characteristic can be obtained only through simple temperature change. According to the present invention, the change of the light emitting characteristic can be observed according to the temperature of the tungstate fluorescent powder, such as the hand temperature or the environment temperature, such that the temperature change photoluminescence material of the dynamic mechanoluminescence tungstate-based fluorescent powder has characteristics of large temperature change range, good stability, high light emitting efficiency and no environmental pollution, and most importantly, the mechanoluminescence does not need energy charging, and has the self-recovery effect.

Description

Technical Field

[0001] The invention relates to the field of luminous anti-counterfeiting, and in particular to a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof. Background Art

[0002] Optical anti-counterfeiting materials are considered to be one of the most ideal optical functional materials for information security. In an environment where counterfeit and shoddy products are posing a serious security threat to individuals, companies and even the entire country, optical anti-counterfeiting materials are selected for trademark anti-counterfeiting and information encryption due to their visibility, multicolor and simple design.

[0003] The existing photofunctional materials of mesoluminescent materials are mainly sulfides or afterglow-type oxides. Sulfides do not require charging and can self-recover, but sulfides are unstable and pollute the environment, and have a small variety of luminescent colors. Afterglow-type oxides are stable and pollution-free, but they need to be charged and do not have a self-recovery effect.

[0004] Therefore, it is necessary to provide a tungstate-based flexible composite material with multi-mode dynamic color-changing properties and a preparation method thereof to solve the above-mentioned technical problems. Summary of the invention

[0005] The present invention provides a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof, which solves the problems that the sulfide of the existing mechanoluminescent material is unstable and pollutes the environment, has a small variety of luminescent colors, and the afterglow oxide needs to be charged and has no self-recovery effect.

[0006] In order to solve the above technical problems, the present invention provides a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics, comprising:

[0007] Optical functional materials and carrier materials;

[0008] The optical functional material is a tungstate-based phosphor, and the tungstate-based phosphor includes Li (1-x) YW2O8:xEu(0% <x<10%);

[0009] The carrier materials are polydimethylsiloxane A liquid and B liquid.

[0010] A method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties, the method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties as claimed in claim 1, comprising the following steps:

[0011] S1: According to the chemical formula Li (1-x)The stoichiometric ratio of the corresponding elements in YW2O8:xEu is as follows: Weigh the raw materials: the compound containing lithium ions, the compound containing yttrium ions, the compound containing tungsten ions and the compound containing europium ions, put them into an agate mortar and grind them thoroughly until they are mixed evenly, of which 0% <x<10%;

[0012] S2: Mix the raw materials obtained in step 1 and place them in a crucible, then calcine them at a temperature of 800°C for 6 hours, and then cool them naturally to room temperature to obtain the phosphor LiYW2O8:Eu. 3+ ;

[0013] S3: putting the raw material obtained in step 2 into a stirring device, adding distilled water and stirring, adding the corresponding nitrate, slowly adding the fluoride salt / nitrate solution, filtering out the product after sufficient reaction, calcining the product and then naturally cooling it to room temperature;

[0014] S4: Mix polydimethylsiloxane A liquid and B liquid according to the proportion, with B liquid accounting for 5%-30%, and add a certain amount of phosphor LiYW2O8:Eu to the obtained polydimethylsiloxane mixed liquid 3+ , the mass ratio of phosphor to polydimethylsiloxane is 0.1-1:1;

[0015] S5: stirring the mixture of phosphor and polydimethylsiloxane evenly, preparing a precursor by screen printing technology, placing the precursor in an incubator, and keeping it incubated at a specific temperature for more than 2 hours to obtain a flexible composite material of tungstate-based dynamic luminescent phosphor;

[0016] S6: Take out the sample, and the preparation of the photoinduced multi-mode dynamic luminescent composite material is completed.

[0017] Preferably, in step 2, the sintering temperature ranges from 600 to 1000°C.

[0018] Preferably, the fluoride salt in step S3 includes raw materials such as ammonium fluoride and ammonium bifluoride.

[0019] Preferably, the nitrate in step S3 includes raw materials such as aluminum nitrate, barium nitrate, and calcium nitrate.

[0020] Preferably, in step S3, the optimal mass ratio of the polydimethylsiloxane solution A to the polydimethylsiloxane solution B is 10:1, and the optimal mass ratio of the phosphor to the polydimethylsiloxane is 0.5:1.

[0021] Preferably, in step S4, the temperature of the precursor placed in the incubator is 60° C. and the incubation time is 2 hours.

[0022] Preferably, the stirring device in step S3 comprises a tank body, a stirring motor is fixedly installed on the top of the tank body, an output end of the stirring motor is connected to a stirring rod via a coupling, and a plurality of stirring blades are fixedly connected to the surface of the stirring rod;

[0023] A filter is fixedly installed inside the tank, and a scraper ring is arranged on the top of the filter;

[0024] A rotating groove is provided inside the tank body, a rotating rod is rotatably connected inside the rotating groove, a rotating block is threadedly connected to the surface of the rotating rod, and a rotating motor is provided at one end of the rotating rod;

[0025] A collecting box is arranged at the bottom of the tank body, a delivery pipe is fixedly installed at the bottom of the tank body, and a valve is fixedly installed on the surface of the delivery pipe.

[0026] Preferably, the bottom of the tank body is fixedly connected to a support plate, a movable groove is opened inside the support plate, a movable plate is slidably connected inside the movable groove, the top of the movable plate is fixedly connected to a limited position frame, a fixing hole is opened inside the movable plate, and a fixing pin is slidably connected inside the fixing hole.

[0027] Preferably, two sliding grooves are provided inside the support plate, and sliding blocks are slidably connected inside the two sliding grooves.

[0028] Compared with the related art, the tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and the preparation method thereof provided by the present invention have the following beneficial effects:

[0029] The present invention provides a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof. The multi-mode dynamic luminescent composite material is prepared by mixing polydimethylsiloxane A liquid and B liquid according to a certain proportion and adding a certain amount of phosphor LiYW2O8:Eu3+. The change of the luminescent characteristics can be observed through a simple temperature change, such as hand temperature or ambient temperature, so that the temperature-variable photoluminescent material of the dynamic mechanoluminescent tungstate-based phosphor has a large temperature change range, good stability, high luminous efficiency, and no pollution to the environment. Most importantly, the mechanoluminescence does not require charging and has a self-recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a first embodiment of a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof provided by the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of a sectional view of the tank body shown;

[0032] Figure 3 for Figure 2 An enlarged schematic diagram of part A is shown;

[0033] Figure 4 is the emission spectra of different doping concentrations;

[0034] Figure 5 It is the temperature-dependent photoluminescence of the force-induced photoinduced multi-mode dynamic luminescent composite material;

[0035] Figure 6 A schematic structural diagram of a second embodiment of a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof provided by the present invention;

[0036] Figure 7 for Figure 4 An enlarged schematic diagram of part B is shown.

[0037] Numbers in the figure: 1. tank body, 2. stirring motor, 21. stirring rod, 22. stirring blade, 3. filter, 4. scraper ring, 5. rotating groove, 6. rotating rod, 7. rotating block, 8. rotating motor, 9. collecting box, 10. conveying pipe, 11. valve, 12. support plate, 13. moving groove, 14. moving plate, 15. limit frame, 16. sliding groove, 17. sliding block, 18. fixing hole, 19. fixing pin. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0039] First embodiment

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic structural diagram of a first embodiment of a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of a sectional view of the tank body shown; Figure 3 for Figure 2 An enlarged schematic diagram of part A is shown; Figure 4 is the emission spectra of different doping concentrations; Figure 5 The invention relates to a temperature-dependent photoluminescence of a force-induced photoinduced multi-mode dynamic luminescent composite material. A tungstate-based flexible composite material with multi-mode dynamic color-changing properties comprises:

[0041] Optical functional materials and carrier materials;

[0042] The optical functional material is a tungstate-based phosphor, and the tungstate-based phosphor includes Li(1-x) YW2O8:xEu(0% <x<10%);

[0043] The carrier materials are polydimethylsiloxane A liquid and B liquid.

[0044] A method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties, the method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties as claimed in claim 1, comprising the following steps:

[0045] S1: According to the chemical formula Li (1-x) The stoichiometric ratio of the corresponding elements in YW2O8:xEu is as follows: Weigh the raw materials: the compound containing lithium ions, the compound containing yttrium ions, the compound containing tungsten ions and the compound containing europium ions, put them into an agate mortar and grind them thoroughly until they are mixed evenly, of which 0% <x<10%;

[0046] S2: Mix the raw materials obtained in step 1 and place them in a crucible, then calcine them at a temperature of 800°C for 6 hours, and then cool them naturally to room temperature to obtain the phosphor LiYW2O8:Eu. 3+ ;

[0047] S3: putting the raw material obtained in step 2 into a stirring device, adding distilled water and stirring, adding the corresponding nitrate, slowly adding the fluoride salt / nitrate solution, filtering out the product after sufficient reaction, calcining the product and then naturally cooling it to room temperature;

[0048] S4: Mix polydimethylsiloxane A liquid and B liquid according to the proportion, with B liquid accounting for 5%-30%, and add a certain amount of phosphor LiYW2O8:Eu to the obtained polydimethylsiloxane mixed liquid 3+ , the mass ratio of phosphor to polydimethylsiloxane is 0.1-1:1;

[0049] S5: stirring the mixture of phosphor and polydimethylsiloxane evenly, preparing a precursor by screen printing technology, placing the precursor in an incubator, and keeping it incubated at a specific temperature for more than 2 hours to obtain a flexible composite material of tungstate-based dynamic luminescent phosphor;

[0050] S6: Take out the sample, and the preparation of the photoinduced multi-mode dynamic luminescent composite material is completed.

[0051] In the step 2, the sintering temperature ranges from 600 to 1000°C.

[0052] The fluoride salt in step S3 includes raw materials such as ammonium fluoride and ammonium bifluoride.

[0053] The nitrate in step S3 includes raw materials such as aluminum nitrate, barium nitrate, and calcium nitrate.

[0054] In the step S3, the optimal mass ratio of the polydimethylsiloxane liquid A to the polydimethylsiloxane liquid B is 10:1, and the optimal mass ratio of the phosphor to the polydimethylsiloxane is 0.5:1.

[0055] In step S4, the temperature of the precursor in the incubator is 60° C. and the incubation time is 2 hours.

[0056] The optical functional material can be a fluoride-coated lithium yttrium tungstate phosphor (LiYW2O8), and a product obtained by partially replacing cations (Y3+) with europium elements (Eu3+).

[0057] The carrier material can also be acrylic, natural rubber, silicone, PU, ​​PET, TPE or TPR material.

[0058] The advantages of the force-induced photoinduced multi-mode dynamic luminescent composite material are no pollution, no need for charging, self-recovery, and high luminescence efficiency;

[0059] Only after the carrier material and the coated tungstate-based phosphor are combined can a significant mechanoluminescence effect be achieved;

[0060] The raw materials required for the Lizhi photoinduced multi-mode dynamic luminescent composite material are simple, the process is convenient, no large-scale equipment is required, mass production is convenient, and the performance is stable;

[0061] The mechanoluminescent multi-mode dynamic luminescent composite material has a wide temperature range (-140℃—180℃), good elasticity, flexibility, thermal stability and water stability. It has a good mechanoluminescent effect in an environment of 300℃.

[0062] The force-induced photoinduced multi-mode dynamic luminescent composite material can respond to actions such as stretching, scratching, bending, and tearing under the action of force, and convert them into visible light. The luminescence intensity is positively correlated with the degree of deformation.

[0063] The force-induced photoluminescent multi-mode dynamic luminescent composite material solves the key problems that "existing sulfide force-induced photoluminescent materials are unstable, polluted and have few types of luminescent colors", "existing afterglow-type oxide force-induced photoluminescent materials need to be charged and cannot self-recover", and "existing temperature-variable force-induced photoluminescent materials are limited to above room temperature".

[0064] more Figure 5It can be seen that at low temperature of -140℃, green mechanoluminescence is emitted. As the temperature rises to +180℃, the color of the material gradually changes from green to red. At the same time, yellow and orange luminescence also exist. When the rare earth europium ion doping rate is 0, the luminescence of lithium yttrium tungstate coated with matrix fluoride salt also changes with the increase of temperature, from green to blue. The raw materials required for preparing the product are simple, the process used is convenient, the preparation process does not require large-scale equipment, and is convenient for mass production. The present invention has excellent elasticity, strong thermal stability, good water stability, and is sensitive to temperature. The thermochromic effect is obvious. Therefore, the LiYW2O8:Eu3+ / PDMS composite material has potential application value in the fields of multi-mode dynamic mechanoluminescence, photoluminescent optical trademark anti-counterfeiting and information encryption.

[0065] The stirring device in step S3 comprises a tank body 1, a stirring motor 2 is fixedly mounted on the top of the tank body 1, an output end of the stirring motor 2 is connected to a stirring rod 21 via a coupling, and a plurality of stirring blades 22 are fixedly connected to the surface of the stirring rod 21;

[0066] A filter element 3 is fixedly installed inside the tank body 1, and a scraper ring 4 is arranged on the top of the filter element 3;

[0067] A rotating groove 5 is provided inside the tank body 1, a rotating rod 6 is rotatably connected inside the rotating groove 5, a rotating block 7 is threadedly connected to the surface of the rotating rod 6, and a rotating motor 8 is provided at one end of the rotating rod 6;

[0068] A collecting box 9 is disposed at the bottom of the tank body 1 , a delivery pipe 10 is fixedly installed at the bottom of the tank body 1 , and a valve 11 is fixedly installed on the surface of the delivery pipe 10 .

[0069] The filter element 3 is a filter screen, which is used to filter the liquid inside the tank body 1 .

[0070] The rotating block 7 is a rectangular block, the rotating groove 5 is a rectangular groove adapted to the rotating block 7, the rotating rod 6 is a threaded rod, the rotating block 7 is a threaded block adapted to the rotating rod 6, the rotating motor 8 is fixedly installed on one side of the tank body 1, the output end of the rotating motor 8 is connected to one end of the rotating rod 6 through a coupling, and one side of the rotating block 7 is fixedly connected to the surface of the scraper ring 4.

[0071] A discharge port is provided inside the tank body 1, and a collecting box 9 is used to collect the product discharged from the discharge port.

[0072] The delivery pipe 10 is used to discharge the waste water in the tank body 1 .

[0073] When in use, the stirring motor 2 is started to drive the stirring rod 21 to drive multiple stirring blades 22 to rotate to one side to stir the mixture inside the tank body 1. After the reaction is completed, the valve 11 is opened, and the liquid inside the tank body 1 is filtered through the filter element 3. The waste liquid is discharged and the product produced by the reaction is filtered and retained on the top of the filter element 3. When the filtration is completed.

[0074] By starting the rotating motor 8, the rotating rod 6 is driven to rotate to one side, so that the rotating block 7 moves to one side inside the rotating groove 5 and moves to one side on the surface of the rotating rod 6, thereby driving the scraper ring 4 to move to one side, scraping the reaction product of the filter element 3 and driving it to move to one side, so that the reaction product falls into the interior of the collecting box 3 through the discharge port of the tank body 1.

[0075] By starting the rotating motor 8 to reverse, the rotating rod 6 is driven to reverse, so that the rotating block 7 connected to the scraper ring 4 moves to one side to reset.

[0076] The working principle of a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof provided by the present invention is as follows:

[0077] When used, according to the chemical formula Li (1-x) The stoichiometric ratio of the corresponding elements in YW2O8:xEu is as follows: Weigh the raw materials: the compound containing lithium ions, the compound containing yttrium ions, the compound containing tungsten ions and the compound containing europium ions, put them into an agate mortar and grind them thoroughly until they are mixed evenly, of which 0% <x<10%;

[0078] The raw materials obtained in step 1 are mixed and placed in a crucible, and then calcined at a temperature of 800°C for 6 hours, and then naturally cooled to room temperature to obtain the phosphor LiYW2O8:Eu. 3+ ;

[0079] Put the raw material obtained in step 2 into a stirring device, add distilled water and stir, add the corresponding nitrate, slowly add the fluoride salt / nitrate solution, filter out the product after sufficient reaction, calcine the product and then naturally cool it to room temperature;

[0080] Mix polydimethylsiloxane A liquid and B liquid according to the proportion, with B liquid accounting for 5%-30%. Add a certain amount of phosphor LiYW2O8:Eu into the obtained polydimethylsiloxane mixed liquid. 3+ , the mass ratio of phosphor to polydimethylsiloxane is 0.1-1:1;

[0081] The mixture of phosphor and polydimethylsiloxane is stirred evenly, and a precursor is prepared by screen printing technology, and the precursor is placed in an incubator and kept at a specific temperature for more than 2 hours to obtain a flexible composite material of tungstate-based dynamic luminescent phosphor;

[0082] The sample is taken out and the preparation of the photoinduced multi-mode dynamic luminescent composite material is completed.

[0083] Compared with the related art, the tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and the preparation method thereof provided by the present invention have the following beneficial effects:

[0084] The present invention provides a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof. The multi-mode dynamic luminescent composite material is prepared by mixing polydimethylsiloxane A liquid and B liquid according to a certain proportion and adding a certain amount of phosphor LiYW2O8:Eu3+. The change of the luminescent characteristics can be observed through a simple temperature change, such as hand temperature or ambient temperature, so that the temperature-variable photoluminescent material of the dynamic mechanoluminescent tungstate-based phosphor has a large temperature change range, good stability, high luminous efficiency, and no pollution to the environment. Most importantly, the mechanoluminescence does not require charging and has a self-recovery effect.

[0085] Second embodiment

[0086] Please refer to Figure 6 and Figure 7 Based on the tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and its preparation method provided in the first embodiment of the present application, the second embodiment of the present application proposes another tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and its preparation method. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0087] Specifically, the second embodiment of the present application provides a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof. The difference is that, in a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof, the bottom of the tank body 1 is fixedly connected to a support plate 12, a movable groove 13 is opened inside the support plate 12, a movable plate 14 is slidably connected inside the movable groove 13, a limited position frame 15 is fixedly connected to the top of the movable plate 14, a fixing hole 18 is opened inside the movable plate 14, and a fixing pin 19 is slidably connected inside the fixing hole 18.

[0088] The two limiting frames 15 are used to limit the collection box 9 .

[0089] Two fixing holes 18 adapted to the fixing pins 19 are provided inside the support plate 12 for limiting the movable plate 14 after the movable plate 14 is moved to one side to a suitable position and the fixing pins 19 are inserted into the fixing holes 18 .

[0090] Two sliding grooves 16 are formed inside the support plate 12 , and sliding blocks 17 are slidably connected inside the two sliding grooves 16 .

[0091] One side of the two sliding grooves 16 is respectively connected to the two sides of the inner wall of the moving groove 13, and the two sliding blocks 17 are respectively fixedly connected to the two sides of the moving plate 14 to facilitate the separation of the moving plate 14 from the moving groove 13 when moving to one side.

[0092] The working principle of a tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and a preparation method thereof provided by the present invention is as follows:

[0093] During use, when a collection box 9 is full, the fixing pin 19 is moved upward, thereby moving it upward and separating inside the fixing hole 18, and then the collection box 9 is pushed to one side, driving the movable plate 14 to move to one side inside the movable groove 13, while driving the two sliding blocks 17 to move to one side inside the two sliding grooves 16 respectively, so that the collection box 9 below the discharge port of the tank body 1 is moved to one side and separated, and the empty collection box 9 is moved to the bottom of the discharge port for collection, and then the fixing pin 19 is inserted into the fixing hole 18.

[0094] Compared with the related art, the tungstate-based flexible composite material with multi-mode dynamic color-changing characteristics and the preparation method thereof provided by the present invention have the following beneficial effects:

[0095] The present invention provides a tungstate-based flexible composite material with multi-mode dynamic color change characteristics and a preparation method thereof. The two collecting boxes 9 placed on the moving plate 14 can be quickly replaced by cooperating with the moving groove 13 and the moving plate 14.

[0096] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A tungstate-based flexible composite material with multi-mode dynamic color-changing properties, characterized in that: include: Optical functional materials and carrier materials; The optical functional material is a tungstate-based phosphor, and the tungstate-based phosphor includes Li (1-x) YW2O8:xEu(0% <x<10%); The carrier materials are polydimethylsiloxane A liquid and B liquid.

2. A method for preparing a tungstate-based flexible composite material having multi-mode dynamic color-changing properties, the method for preparing a tungstate-based flexible composite material having multi-mode dynamic color-changing properties as claimed in claim 1, characterized in that: The following steps are involved: S1: According to the chemical formula Li (1-x) The stoichiometric ratio of the corresponding elements in YW2O8:xEu is as follows: Weigh the raw materials: the compound containing lithium ions, the compound containing yttrium ions, the compound containing tungsten ions and the compound containing europium ions, put them into an agate mortar and grind them thoroughly until they are mixed evenly, of which 0% <x<10%; S2: Mix the raw materials obtained in step 1 and place them in a crucible, then calcine them at a temperature of 800°C for 6 hours, and then cool them naturally to room temperature to obtain the phosphor LiYW2O8:Eu. 3+ ; S3: putting the raw material obtained in step 2 into a stirring device, adding distilled water and stirring, adding the corresponding nitrate, slowly adding the fluoride salt / nitrate solution, filtering out the product after sufficient reaction, calcining the product and then naturally cooling it to room temperature; S4: Mix polydimethylsiloxane A liquid and B liquid according to the proportion, with B liquid accounting for 5%-30%, and add a certain amount of phosphor LiYW2O8:Eu to the obtained polydimethylsiloxane mixed liquid 3+ , the mass ratio of phosphor to polydimethylsiloxane is 0.1-1:1; S5: stirring the mixture of phosphor and polydimethylsiloxane evenly, preparing a precursor by screen printing technology, placing the precursor in an incubator, and keeping it incubated at a specific temperature for more than 2 hours to obtain a flexible composite material of tungstate-based dynamic luminescent phosphor; S6: Take out the sample, and the preparation of the photoinduced multi-mode dynamic luminescent composite material is completed.

3. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: In the step 2, the sintering temperature ranges from 600 to 1000°C.

4. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: The fluoride salt in step S3 includes raw materials such as ammonium fluoride and ammonium bifluoride.

5. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: The nitrate in step S3 includes raw materials such as aluminum nitrate, barium nitrate, and calcium nitrate.

6. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: In the step S3, the optimal mass ratio of the polydimethylsiloxane liquid A to the polydimethylsiloxane liquid B is 10:1, and the optimal mass ratio of the phosphor to the polydimethylsiloxane is 0.5:

1.

7. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: In step S4, the temperature of the precursor in the incubator is 60° C. and the incubation time is 2 hours.

8. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 2, characterized in that: In step S3, the stirring device comprises a tank body, a stirring motor is fixedly installed on the top of the tank body, an output end of the stirring motor is connected to a stirring rod via a coupling, and a plurality of stirring blades are fixedly connected to the surface of the stirring rod; A filter is fixedly installed inside the tank, and a scraper ring is arranged on the top of the filter; A rotating groove is provided inside the tank body, a rotating rod is rotatably connected inside the rotating groove, a rotating block is threadedly connected to the surface of the rotating rod, and a rotating motor is provided at one end of the rotating rod; A collecting box is arranged at the bottom of the tank body, a delivery pipe is fixedly installed at the bottom of the tank body, and a valve is fixedly installed on the surface of the delivery pipe.

9. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 8, characterized in that: The bottom of the tank body is fixedly connected to a support plate, a movable groove is provided inside the support plate, a movable plate is slidably connected inside the movable groove, a limited position frame is fixedly connected to the top of the movable plate, a fixing hole is provided inside the movable plate, and a fixing pin is slidably connected inside the fixing hole.

10. The method for preparing a tungstate-based flexible composite material with multi-mode dynamic color-changing properties according to claim 9, characterized in that: Two sliding grooves are arranged inside the support plate, and sliding blocks are slidably connected inside the two sliding grooves.

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