Method for applying self-repairing photochromic elastomer to ultraviolet irradiation dose visual detection
By preparing self-healing photochromic elastomers P1 and P2, the problems of rigidity, fragility and single color of existing UV detection equipment are solved, and low-cost, visual and self-healing UV dose detection is achieved, which is suitable for a variety of application scenarios.
Patent Information
- Application Number
- CN202510946455.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-09-19
AI Technical Summary
Existing ultraviolet light dose detection equipment is costly, rigid and fragile, lacks plasticity and elasticity, and cannot achieve visual detection. In addition, the ultraviolet light sensor based on diarylethene molecules has a single color change and lacks self-repair function.
Two self-healing photochromic elastomers P1 and P2 were prepared by a one-step photopolymerization method. They showed a gradient change from colorless to dark green or bright yellow under 365nm ultraviolet light, and their self-healing properties were combined to make dual-color labels for visual detection.
It realizes low-cost, plastic and self-repairing visual detection of ultraviolet light irradiation dose, has good sensitivity and multiple reuse capabilities, and is suitable for different application scenarios.
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Figure CN120665233A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical fields of chemical material preparation and environmental monitoring, and in particular relates to a method for visually detecting ultraviolet light dose using a self-repairing photochromic elastomer. Background Art
[0002] Ultraviolet (UV) light is a type of electromagnetic radiation that can be broadly categorized into three wavelengths: UVA (315-400 nm), UVB (280-315 nm), and UVC (100-280 nm). In daily life, the UV we are exposed to is primarily in the UVA band. UV light is widely used in the healthcare industry, such as for the disinfection of medical surfaces and devices, as well as in industrial manufacturing processes such as 3D printing, polymer photocuring, and laser micromachining. However, excessive exposure to UV light can be harmful to human health, including eye damage, skin damage, and immune system suppression. In particular, UV light that penetrates the skin can be absorbed by chromophores in cells (such as hemoglobin, melanin, DNA, and nucleic acids), generating free radicals or reactive oxygen species. The generated reactive oxygen species can cause oxidation of biomacromolecules in the skin, such as proteins, lipids, and nucleic acids, as well as cellular components, leading to skin inflammation, skin aging, and ultimately skin cancer. Therefore, monitoring UV light exposure dose is crucial to ensure personal safety and prevent health problems caused by UV light.
[0003] Currently, some methods for detecting UV radiation doses have been developed, mainly based on electronic solid-state devices. These devices are usually expensive, rigid and fragile, lack plasticity and elasticity, and cannot achieve visual detection, which limits their portability and actual field application. On the other hand, diarylethenes have good photochromic effects and photoreversibility in response to UV light and have been used to develop reusable UV sensors. However, the UV sensors currently developed based on diarylethenes have a single color change and lack plasticity, elasticity, and self-repairing functions. Therefore, inventing a low-cost, simple-to-prepare photochromic elastomer with excellent elasticity, plasticity, and self-repairing properties, and applying it to the visual detection of UV radiation doses has important practical significance and application prospects.
[0004] In view of this, the present invention is proposed. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a method for applying a self-healing photochromic elastomer to the visual detection of ultraviolet light irradiation dose. The method uses a one-step photopolymerization method to prepare two self-healing photochromic elastomers. The two elastomers will show a gradient change in color from zero to dark green or bright yellow as the 365nm ultraviolet light irradiation dose increases, and the response sensitivity of the two to the ultraviolet light dose is quite different. Further utilizing their self-healing properties, the two elastomers can be combined to make a dual-color label that can be used for visual detection of ultraviolet light dose.
[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is as follows:
[0007] A method for applying a self-healing photochromic elastomer to visual detection of ultraviolet light irradiation dose comprises the following steps:
[0008] Step 1.1, preparation of self-healing photochromic elastomer P1: trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator I-819), and photochromic diarylethene molecule DTE-3Bz are mixed and dissolved in a certain proportion, placed in a mold, and photopolymerized under 460 nm light for 3 hours to obtain self-healing photochromic elastomer P1.
[0009] Step 1.2, preparation of self-healing photochromic elastomer P2: trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator I-819), and photochromic diarylethene molecule DTE-3S are mixed and dissolved in a certain proportion and placed in a mold. After one-step photopolymerization under 460 nm light for 3 hours, the self-healing photochromic elastomer P2 is obtained.
[0010] Step 1.3, prepare a dual-color label that can be used for visual detection of ultraviolet light dose: cut the self-healing photochromic elastomer P1 and the self-healing photochromic elastomer P2 according to the designed shape and combine them using the self-healing effect to make a dual-color label that can be used for visual detection of ultraviolet light dose. That is, the prepared dual-color label can be used for visual detection of ambient ultraviolet light exposure dose.
[0011] In the above step 1.1, the photochromic diarylethene molecule: ((5-benzothiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene-3,6-diyl))bis(phenyl ketone) (DTE-3Bz) has the following structural formula:
[0012]
[0013] The synthesis steps are:
[0014]
[0015] Benzoyl chloride was slowly added to a dichloromethane and aluminum chloride solution and stirred at 0°C for 1 hour under nitrogen. A dichloromethane solution of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[en]thiophene) prepared according to prior art was added to the solution. The mixture was removed from the ice bath and allowed to react at room temperature for 12 hours. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The organic layer was filtered and concentrated to obtain a crude product. Further column purification was performed to obtain a solid powder, DTE-3Bz. The mass ratio of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[en]thiophene), benzoyl chloride, aluminum chloride, and dichloromethane was 1:2-4:2-4:50-100.
[0016] In the above step 1.1, the mass ratio of TFEMA, HFBA, I-819 and DTE-3Bz is 1:1.0-3.0:0.04-0.07:0.001-0.003.
[0017] In the above step 1.2, the photochromic diarylethene molecule DTE-3S has the following structural formula:
[0018]
[0019] The synthesis steps are:
[0020]
[0021] 3,3'-(Thiophene-2,3-diyl)bis(2-methylbenzo[en]thiophene) prepared according to prior art was dissolved in tetrahydrofuran and N-bromosuccinimide was added under ice-cooling. The mixture was stirred for 10 minutes and then allowed to react at room temperature for 12 hours. After completion, the reaction mixture was poured into a saturated aqueous Na2S2O3 solution and extracted three times with ethyl acetate. The organic phase was collected, dried over anhydrous Na2SO4, filtered, and spun down to dryness. The intermediate product, 3,3'-(5-bromothiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene) (DTE-Br), was obtained by column chromatography. The mass ratio of 3,3'-(Thiophene-2,3-diyl)bis(2-methylbenzo[en]thiophene), N-bromosuccinimide, and tetrahydrofuran was 1:0.5 to 1:20-40.
[0022] Then, m-chloroperbenzoic acid was added to a dichloromethane solution of DTE-Br. After stirring at room temperature for 12 hours, a saturated aqueous Na2CO3 solution was added to adjust the pH to a weak base. The reaction mixture was extracted with petroleum ether, and the organic phase was collected, dried over anhydrous Na2SO4, and purified by column chromatography to obtain the solid product DTE-3S. The mass ratio of DTE-Br, m-chloroperbenzoic acid, dichloromethane, and saturated aqueous Na2CO3 was 1:3-6:10-30:20-50.
[0023] In the above step 1.2, the mass ratio of TFEMA, HFBA, I-819 and DTE-3S is 1:1.0-3.0:0.04-0.07:0.001-0.003.
[0024] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.
[0025] (1) The two new photochromic diarylethenes synthesized in the present invention exhibit gradient color changes from colorless to dark green (DTE-3Bz) and from colorless to bright yellow (DTE-3S) under 365nm ultraviolet light irradiation, respectively. They have good photoreversibility and can be reused multiple times. In addition, the two have significant differences in their response sensitivity to ultraviolet light dose.
[0026] (2) The self-healing photochromic elastomer prepared in the present invention has excellent elasticity, plasticity and self-healing properties. Its self-healing properties can be combined to prepare a dual-color label that can be used for visual detection of ultraviolet light dose, which is conducive to adapting to different practical application scenarios.
[0027] (3) The preparation method of the self-healing photochromic elastomer produced by the present invention is simple and rapid, and does not require the addition of solvents or post-processing, which has great advantages in scale-up synthesis and actual production applications.
[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:
[0030] Figure 1 This is the H NMR spectrum of the photochromic diarylethene molecule DTE-3Bz;
[0031] Figure 2 This is the H NMR spectrum of the photochromic diarylethene molecule DTE-3S;
[0032] Figure 3 is the UV absorption graph of the prepared self-healing photochromic elastomer P1;
[0033] Figure 4 UV absorption graph of the prepared self-healing photochromic elastomer P2;
[0034] Figure 5 The fitting curve corresponding to the absorption change of the self-healing photochromic elastomer P1 with the change of ultraviolet radiation dose and the linear function graph corresponding to the part of the curve range at different ultraviolet radiation doses;
[0035] Figure 6 The fitting curve corresponding to the absorption change of the self-healing photochromic elastomer P2 with the change of ultraviolet radiation dose and the linear function graph corresponding to the part of the curve range at different ultraviolet radiation doses;
[0036] Among them: fixed radiation intensity is 100W / m 2 , irradiation dose (J / m 2 )=irradiation time (s)×UVA intensity (W / m 2 );
[0037] Figure 7 The photographic display of the color change of the self-healing photochromic elastomer that can be distinguished by the naked eye and the corresponding UV light dose;
[0038] Figure 8 The tensile diagram of the self-healing photochromic elastomer P2 before and after shearing (a) and the self-healing effect diagram (b);
[0039] Figure 9 This is an application diagram of the UV detection label demonstrated by the self-healing combination of self-healing photochromic elastomers P1 and P2.
[0040] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in combination with the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.
[0042] Example 1:
[0043] (1) Synthesis of photochromic diarylethene molecule DTE-3Bz:
[0044]
[0045] Benzoyl chloride (4.48 g) was slowly added to a solution of anhydrous dichloromethane (130 g) and aluminum chloride (4.25 g). The mixture was stirred at 0°C for 1 hour under nitrogen. A dichloromethane (50 g) solution of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[ene]thiophene) (DTE, 2 g), prepared according to prior art, was added to the solution. The mixture was removed from the ice bath and allowed to react overnight at room temperature. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The organic layer was filtered and concentrated to obtain a crude product. Purification by column chromatography gave a green solid powder, the product DTE-3Bz (2.29 g).
[0046] (2) Synthesis of photochromic diarylethene molecule DTE-3S:
[0047]
[0048] Synthesis of 3,3'-(5-bromothiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene) (DTE-Br): 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene) (DTE, 0.37 g) prepared with reference to the prior art was dissolved in tetrahydrofuran (10 g). N-bromosuccinimide (0.26 g) was added under ice-cooling. After stirring for 10 minutes, the mixture was allowed to react at room temperature for 12 hours. After completion of the reaction, the reaction solution was poured into 100 mL of saturated aqueous Na2S2O3 solution and extracted three times with ethyl acetate. The organic phase was collected, dried over anhydrous Na2SO4, filtered, and dried. The product DTE-Br (0.31 g) was purified by column chromatography.
[0049] m-Chloroperbenzoic acid (1.4 g) was added to a solution of DTE-Br (0.33 g) in dichloromethane (15 g). After stirring at room temperature for 12 hours, 12 g of a saturated aqueous solution of Na2CO3 was added to adjust the pH to a weak base. The reaction mixture was extracted with petroleum ether, and the organic phase was collected, dried over anhydrous Na2SO4, and purified by column chromatography to obtain the product DTE-3S (0.32 g).
[0050] Example 2
[0051] The preparation steps of self-healing photochromic elastomers P1 and P2 are as follows:
[0052] (1) 5.04 g of trifluoroethyl methacrylate, 10.62 g of hexafluorobutyl acrylate, 0.31 g of photoinitiator, and 0.015 g of DTE-3Bz were mixed and ultrasonicated for 15 min. After injection, the mixture was placed in a sealed reaction cell consisting of glass plates with a spacing of 1 mm. The mixture was polymerized under visible light (460 nm, 40 mW / min) for 3 hours to obtain a photochromic elastomer P1.
[0053] (2) 5.04 g of trifluoroethyl methacrylate, 10.62 g of hexafluorobutyl acrylate, 0.31 g of a photoinitiator, and 0.015 g of DTE-3S were mixed and sonicated for 15 min. After injection, the mixture was placed in a sealed reaction cell consisting of glass plates spaced 1 mm apart. Polymerization was performed under visible light (460 nm, 40 mW / min) for 3 hours to obtain elastomer P2.
[0054] Example 3: Testing the UV-visible absorption spectra of the two prepared photochromic elastomers P1 and P2 under different external light conditions
[0055] Figure 1 This is the H NMR spectrum of the photochromic diarylethene molecule DTE-3Bz prepared in Example 1 (1). Figure 2 This is the hydrogen nuclear magnetic resonance spectrum of the photochromic diarylethene molecule DTE-3S prepared in Example 1(2). Figure 3 The UV-visible absorption spectrum of the polymer capable of detecting UV light dose prepared in Example 2(1) in the range of 300 nm to 800 nm. Figure 4 The UV-visible absorption spectrum of the polymer prepared in Example 2(2) with detectable UV dose in the range of 300 nm to 700 nm. Figure 3 It can be seen from the figure that the characteristic absorption peak of DTE-3Bz appears at 638 nm under the irradiation of 365 nm UV light. Figure 4 As can be seen in the figure, polymer P2 exhibits the characteristic absorption peak of DTE-3S at 480 nm under 365 nm UV light. Under 525 nm visible light, the characteristic peaks of P1 and P2 disappear, exhibiting a distinct color change before and after irradiation. These results demonstrate that both P1 and P2 elastomers exhibit excellent photochromic behavior and a clear response to UV light.
[0056] Example 4: Schematic diagram of the fitting curve of the self-healing photochromic polymer under fixed irradiation intensity
[0057] In the UV detection experiment under fixed light intensity, the LED UV light source was fixed at a fixed position (80W), and the UV radiation energy and irradiance were measured by a UV detector (LS125-UVA-X1 sunlight probe). The UV sensor P1 and P2 prepared in Example 2 were used for the measurement. The absorption values at 638 nm and 480 nm of the UV sensor increased significantly, and the detection limits were 11.84 J / m 2 and 104.89 J / m 2 .according to Figure 3 The relationship between the change of the characteristic absorption peak at 638 nm and the change of the ultraviolet dose can be fitted to make a relatively ideal function curve and the function graph corresponding to the curve: y = a + b × x, a = 0.06494, b = 6.67 × 10 -4 , R 2 =0.9678, see Figure 5 .according to Figure 4 The relationship between the change value of the characteristic absorption peak at 480 nm and the change of the ultraviolet dose can be fitted to make a relatively ideal function curve and the function graph corresponding to the curve: y = a + b × x, a = 0.10207, b = 5.86 × 10 -5 , R 2 =0.9651, see Figure 6 The test results show that the above polymers P1 and P2 have a good linear relationship with the ultraviolet radiation dose within a certain range, indicating that these two polymers can be used to detect ultraviolet radiation dose.
[0058] Example 5: Demonstration of the effect of UV sensor color change with UV dose change
[0059] Take the self-repairing photochromic polymers P1 and P2 prepared in Example 2 and conduct a photo experiment within the response range. Figure 7 As shown, under fixed light intensity (200W / m 2 ) and irradiated with 365 nm UV light, P1 gradually changed from transparent and colorless to dark green (0-1000 J / m 2 ), P2 gradually changes from transparent and colorless to bright yellow (0-6000J / m 2 ), and the color change is visible to the naked eye. This visible color change of ultraviolet light in the corresponding range makes it possible to achieve visual detection of ultraviolet light dose.
[0060] Example 6: Polymer tensile test experiment and effect demonstration
[0061] Taking the self-repairing photochromic polymer P2 prepared in Example 2 as an example, tensile tests were performed on them before cutting and after cutting and self-repairing (50°C) for 12 hours. Figure 8As shown in a, the stress deformation before cutting can reach 600%, and the self-healing membrane can reach 480%, with a self-healing efficiency of up to 80%. Figure 8 As shown in Figure b, after cutting, the polymer film can automatically heal at 50°C without any surface damage and still maintains good stability. These results are sufficient to demonstrate that our polymer has good elasticity and self-healing ability.
[0062] Example 7: Self-healing photochromic polymers are used to construct UV sensor tags for packaging.
[0063] By combining P1 and P2 of Example 2 through self-repair, an application display with a "sun" pattern is obtained, which is used as a UV sensor label in packaging. Figure 9 As shown here, a label capable of detecting UV light leakage is shown: the light spot part of the "sun" is composed of P1, and the spherical part of the "sun" is composed of P2. At 50°C, they are combined into the label shape of the "sun" by self-healing behavior, and the label is attached to the inside of a homemade box. When 365nm ultraviolet light does not leak into the box, the "sun" label will not change any color (1h). When the box is opened to allow 365nm ultraviolet radiation to leak in, the sensitive ultraviolet light is received by the "sun", and P1 will first sense this change and quickly turn green. Secondly, when the ultraviolet light dose is too high, P2 will gradually change color until it becomes bright yellow. The label is sensitive to ultraviolet radiation within a wide range and can change color quickly, making it suitable for protecting materials and equipment that are sensitive to ultraviolet light. See the results. Figure 9 The measurement results show that the self-repairing UV tag has a visual color change in response to different UV light doses, which indicates that the sensor has the ability to visually detect UV light doses.
[0064] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.
Claims
1. A method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer, characterized in that: The following steps are involved: Step 1.1, preparation of self-healing photochromic elastomer P1: trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, and photochromic diarylethene molecule DTE-3Bz are mixed and dissolved in a certain proportion and placed in a mold. After photopolymerization under 460 nm light, the self-healing photochromic elastomer film P1 is obtained. Step 1.2, preparation of self-healing photochromic elastomer P2: trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, and photochromic diarylethene molecule DTE-3S are mixed and dissolved in a certain proportion and placed in a mold. After one-step photopolymerization under 460 nm light, the self-healing photochromic elastomer P2 is obtained. In step 1.3, the self-healing photochromic elastomer P1 and the self-healing photochromic elastomer P2 are cut according to the designed shape and combined using the self-healing effect to produce a dual-color label that can be used for visual detection of ambient ultraviolet light exposure dose.
2. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1, characterized in that: The photochromic diarylethene molecule DTE-3Bz in step 1.1 has the following structural formula:
3. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1 or 2, characterized in that: The synthesis steps of the photochromic diarylethene molecule DTE-3Bz in step 1.1 are as follows: Benzoyl chloride was slowly added to a dichloromethane and aluminum chloride solution, and stirred at 0°C for 1 hour under nitrogen protection. A dichloromethane solution of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[ene]thiophene) prepared according to the prior art was added to the solution. The solution was removed from the ice bath and reacted at room temperature for 12 hours. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The organic layer was filtered and concentrated to obtain a crude product, which was further purified by column chromatography to obtain a solid powder, namely DTE-3Bz. The mass ratio of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[ene]thiophene), benzoyl chloride, aluminum trichloride and dichloromethane is 1:2-4:2-4:50-100.
4. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1, characterized in that: In the step 1.1, the mass ratio of trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, and photochromic diarylethene molecule DTE-3Bz is 1:1.0-3.0:0.04-0.07:0.001-0.
003.
5. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1, characterized in that: The photochromic diarylethene molecule DTE-3S in step 1.2 has the following structural formula:
6. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1 or 5, characterized in that: The synthesis steps of the photochromic diarylethene molecule DTE-3S in step 1.2 are as follows: 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[ene]thiophene) prepared according to the prior art was dissolved in tetrahydrofuran, and N-bromosuccinimide was added under ice bath. After stirring for 10 minutes, the mixture was transferred to room temperature and reacted for 12 hours. After the reaction was completed, the reaction solution was poured into a saturated Na2S2O3 aqueous solution, extracted three times with ethyl acetate, and the organic phase was collected, dried over anhydrous Na2SO4, filtered, and dried, and purified by column chromatography to obtain the intermediate product 3,3'-(5-bromothiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene); Then, m-chloroperbenzoic acid was added to a dichloromethane solution of 3,3'-(5-bromothiophene-2,3-diyl)bis(2-methylbenzo[b]thiophene), and the mixture was stirred at room temperature for 12 hours. Then, a saturated aqueous solution of Na2CO3 was added to adjust the pH value to a weak base. The reaction mixture was extracted with petroleum ether, and the organic phase was collected, dried over anhydrous Na2SO4, and purified by column chromatography to obtain a solid product, DTE-3S. Among them, the mass ratio of 3,3'-(thiophene-2,3-diyl)bis(2-methylbenzo[ene]thiophene), N-bromosuccinimide and tetrahydrofuran is 1:0.5~1:20~40; the mass ratio of DTE-Br, m-chloroperbenzoic acid, dichloromethane and saturated Na2CO3 aqueous solution is 1:3~6:10~30:20~50.
7. The method for visually detecting ultraviolet light dose using a self-healing photochromic elastomer according to claim 1, characterized in that: In the step 1.2, the mass ratio of trifluoroethyl methacrylate TFEMA, hexafluorobutyl acrylate HFBA, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, and photochromic diarylethene molecule DTE-3S is 1:1.0-3.0:0.04-0.07:0.001-0.003.