Light response intelligent shading curtain track assembly and preparation method thereof

Abstract

The invention relates to the technical field of curtain accessories, in particular to a light response intelligent shading curtain track assembly and a preparation method of the light response intelligent shading curtain track assembly. 5 to 15 parts of spiropyrane; 3 to 8 parts of polycaprolactone glycol; 0.5 to 2 parts of sodium dodecyl benzene sulfonate; 0.3 to 1 part of 2, 6-di-tert-butyl-4-methylphenol; 2 to 6 parts of dioctyl phthalate; 10 to 20 parts of nano titanium dioxide; according to the invention, the modified polyurethane resin is adopted as a matrix material, and spiropyrane is introduced as a main photosensitive material. The isocyanate group (-NCO) in the modified polyurethane resin reacts with the hydroxyl group (-OH) in the spiropyrane molecule to form a stable carbamate bond. The chemical bonding not only enhances the dispersibility of the photosensitive material in the matrix, but also improves the durability of the whole system.

Description

Technical Field

[0001] The invention relates to the technical field of curtain accessories, and in particular to a light-responsive intelligent shading curtain track component and a preparation method thereof. Background Art

[0002] As people's pursuit of quality of life continues to improve, smart home devices are becoming increasingly popular. In this field, smart blackout curtains, as a device that can automatically adjust indoor light, are gradually becoming a hot spot in the market. However, most of the existing smart blackout curtains rely on electric drive and complex control systems, which not only have high installation and maintenance costs, but also cannot work properly in the event of a power outage. In addition, traditional blackout materials often lack the ability to dynamically respond to light intensity, making it difficult to achieve refined light adjustment.

[0003] In response to these problems, researchers have been exploring new light-responsive materials and structures. Among them, shading devices made of photochromic materials have attracted widespread attention. This type of material can automatically change color and transmittance according to light intensity without external energy input. However, existing photochromic materials still face many challenges in practical applications, such as slow response speed, poor durability, and insufficient mechanical strength. Summary of the invention

[0004] The light-responsive intelligent shading curtain track assembly and the preparation method thereof of the present invention are intended to solve multiple problems existing in the prior art.

[0005] The object of the present invention is to provide a light-responsive intelligent shading curtain track assembly, which comprises the following components in parts by weight:

[0006] 40-60 parts of modified polyurethane resin;

[0007] Spiropyran 5-15 parts;

[0008] 3-8 parts of polycaprolactone diol;

[0009] Sodium dodecylbenzenesulfonate 0.5-2 parts;

[0010] 2,6-di-tert-butyl-4-methylphenol 0.3-1 part;

[0011] 2-6 parts of dioctyl ester;

[0012] 10-20 parts of nano titanium dioxide;

[0013] N-methylpyrrolidone 13.6-39.2 parts.

[0014] Preferably, the modified polyurethane resin is Elastollan 1185A.

[0015] Preferably, the spiropyran is Photochromic Blue.

[0016] Preferably, the polycaprolactone diol is CAPA 2205.

[0017] Preferably, the nano titanium dioxide is P25.

[0018] The method for preparing the light-responsive intelligent shading curtain track assembly comprises the following steps:

[0019] Step (1): first, dissolving the modified polyurethane resin in the N-methylpyrrolidone;

[0020] Step (2): Secondly, adding the polycaprolactone diol to the mixture of step (1);

[0021] Step (3): Then, adding the sodium dodecylbenzene sulfonate dissolved in water to the mixture of step (2);

[0022] Step (4): Again, adding the 2,6-di-tert-butyl-4-methylphenol and the dioctyl ester to the mixture of step (3);

[0023] Step (5): Next, adding the nano titanium dioxide to the mixture of step (4);

[0024] Step (6): Subsequently, adding the spiropyran dissolved in N-methylpyrrolidone to the mixture of step (5);

[0025] Step (7): further, vacuum degassing the mixture obtained in step (6);

[0026] Step (8): Then, the deaerated mixture is coated on the pretreated surface of the curtain track using a screen printing device;

[0027] Step (9): Finally, the coated curtain track is cured.

[0028] Preferably, in step (1), stirring is performed at 80-90° C. and normal pressure for 1-2 hours.

[0029] Preferably, in step (5), high-speed stirring is performed at 65-75° C. and normal pressure for 1-2 hours.

[0030] Preferably, in step (7), vacuum degassing is performed at 50-60° C. for 20-40 minutes.

[0031] Preferably, in step (8), the screen mesh size is 200-300 mesh, the scraper pressure is 0.2-0.4 MPa, and the printing speed is 100-200 mm / s; in step (9), curing is performed in an oven at 60-80° C. for 2-4 hours.

[0032] The light-responsive intelligent shading curtain track assembly and its preparation method proposed in the present invention cleverly solve the above problems. The innovations of this solution are mainly reflected in the following aspects:

[0033] First, the present invention uses a modified polyurethane resin as a matrix material and introduces spiropyran as a main photosensitive material. The isocyanate group (-NCO) in the modified polyurethane resin reacts with the hydroxyl group (-OH) in the spiropyran molecule to form a stable urethane bond. This chemical bonding not only enhances the dispersibility of the photosensitive material in the matrix, but also improves the durability of the entire system.

[0034] Secondly, the present invention ingeniously introduces nano-titanium dioxide as a multifunctional filler. From the perspective of molecular orbital theory, the conduction band and valence band energy levels of nano-titanium dioxide form a favorable energy match with the HOMO and LUMO energy levels of spiropyran. Under light, nano-titanium dioxide can generate electron-hole pairs, and these carriers can promote the ring-opening reaction of spiropyran, thereby accelerating the light response speed. At the same time, the photocatalytic effect of nano-titanium dioxide can also decompose some organic matter that may cause material aging, further improving the durability of the system.

[0035] Again, the present invention uses polycaprolactone diol as a toughening agent, and its unique molecular structure can form a hydrogen bond network with the polyurethane resin while improving the flexibility of the material. This supramolecular interaction not only enhances the mechanical properties of the material, but also gives the material a certain self-repair ability. When the material is damaged by external forces, these reversible hydrogen bonds can be reformed to repair micro cracks.

[0036] In addition, the present invention also cleverly utilizes sodium dodecylbenzene sulfonate as a dispersant. The hydrophobic alkyl chain of this surfactant can interact with the hydrophobic segment of the polyurethane resin, while its hydrophilic sulfonic acid group can form an electrostatic effect with the surface of nano titanium dioxide. This amphiphilic structure effectively prevents the agglomeration of nano fillers and ensures the uniform dispersion of the fillers in the matrix.

[0037] Finally, the preparation method of the present invention also embodies unique innovation. Through a carefully designed multi-step reaction process, the components are fully mixed and reacted at the molecular level. In particular, during the nanofiller dispersion and photosensitive material introduction stages, specific temperature and stirring conditions are used, which not only facilitates the formation of a uniform and stable dispersion system, but also prevents unnecessary chemical reactions of the photosensitive material during the preparation process.

[0038] In summary, the present invention achieves a perfect balance of light response performance, durability and mechanical properties through multiple innovative designs. This intelligent shading curtain track assembly can not only quickly respond to light changes and automatically adjust the shading effect, but also has excellent weather resistance and mechanical strength. More importantly, the assembly does not require external energy input and complex control systems, greatly reducing installation and use costs. In addition, the present invention unexpectedly discovered that the material has a certain self-healing ability and excellent environmental adaptability, which provides a guarantee for the long-term use of the product under various climatic conditions.

[0039] These innovations not only solve the problems existing in the prior art, but also open up new directions for the development of smart shading materials. The success of this invention lies not only in the careful selection of the individual components, but also in the complex synergy between them. This synergy produces many unexpected positive effects, such as self-healing ability and wide environmental adaptability, which cannot be achieved by a single component. Therefore, this invention not only has important practical value, but also provides valuable ideas and experience for the design of a new generation of multifunctional smart materials. DETAILED DESCRIPTION

[0040] Example 1

[0041] This embodiment provides a light-responsive intelligent shading curtain track assembly and a preparation method thereof. The assembly is composed of the following components: 40 parts by weight of modified polyurethane resin Elastollan 1185A, 5 parts by weight of spiropyran Photochromic Blue, 3 parts by weight of polycaprolactone diol CAPA 2205, 0.5 parts by weight of sodium dodecylbenzenesulfonate Nansa SS 30, 0.3 parts by weight of 2,6-di-tert-butyl-4-methylphenol Ionol CP, 2 parts by weight of dioctyl ester DEHP, 10 parts by weight of nano titanium dioxide P25, and 39.2 parts by weight of N-methylpyrrolidone NMP.

[0042] The preparation method of the light-responsive intelligent shading curtain track assembly comprises the following steps:

[0043] Step (1): First, add 40 parts by weight of Elastollan 1185A and 39.2 parts by weight of NMP into a reaction kettle, and stir at 80° C. and normal pressure for 1 hour to fully dissolve the polyurethane resin.

[0044] Step (2): Next, add 3 parts by weight of CAPA 2205 to the above mixture and stir at 85°C and normal pressure for 30 minutes to make it fully compatible with the matrix material.

[0045] Step (3): Then, 0.5 parts by weight of Nansa SS 30 was dissolved in 10 ml of deionized water and slowly added to the mixture of step (2). The mixture was stirred at 75° C. and normal pressure for 20 minutes to uniformly disperse the dispersant.

[0046] Step (4): Again, add 0.3 parts by weight of Ionol CP and 2 parts by weight of DEHP to the above mixture, and stir at 70° C. and normal pressure for 15 minutes to fully dissolve the additives.

[0047] Step (5): Then, 10 parts by weight of P25 was slowly added to the above mixture and stirred at high speed for 1 hour at 65°C and normal pressure to uniformly disperse the nanofiller.

[0048] Step (6): Then, 5 parts by weight of Photochromic Blue was dissolved in 20 ml of NMP and slowly added dropwise to the above mixture. The mixture was stirred at 60° C. and normal pressure for 30 minutes to uniformly disperse the photosensitive material.

[0049] Step (7): Further, the obtained mixture is vacuum degassed at 50° C. for 20 minutes to remove bubbles in the system.

[0050] Step (8): Then, use screen printing equipment to coat the pretreated curtain track surface. The screen mesh is 200 mesh, the scraper pressure is 0.2 MPa, and the printing speed is 100 mm / s.

[0051] Step (9): Finally, the coated curtain track is placed in an oven at 60°C for curing for 2 hours to obtain the final light-responsive intelligent shading curtain track assembly.

[0052] Preferably, in an embodiment of the present invention, the modified polyurethane resin Elastollan 1185A is used as a matrix material to provide good mechanical strength and flexibility. Spiropyran Photochromic Blue is used as a photosensitive material, which undergoes reversible structural changes under ultraviolet light, thereby realizing an intelligent shading function. Polycaprolactone diol CAPA 2205 is used as a toughening agent to improve the impact resistance of the matrix material. Sodium dodecylbenzene sulfonate Nansa SS 30 is used as a dispersant to effectively prevent the agglomeration of nanofillers. 2,6-di-tert-butyl-4-methylphenol Ionol CP is used as an antioxidant to extend the service life of the material. Dioctyl ester DEHP is used as a plasticizer to further improve the flexibility of the material. Nano titanium dioxide P25 not only enhances the light response effect, but also improves the wear resistance and weather resistance of the coating.

[0053] Example 2

[0054] This embodiment provides a light-responsive intelligent shading curtain track assembly and a preparation method thereof. The assembly is composed of the following components: 50 parts by weight of modified polyurethane resin Elastollan 1185A, 10 parts by weight of spiropyran Photochromic Blue, 5.5 parts by weight of polycaprolactone diol CAPA 2205, 1.25 parts by weight of sodium dodecylbenzenesulfonate Nansa SS 30, 0.65 parts by weight of 2,6-di-tert-butyl-4-methylphenol Ionol CP, 4 parts by weight of dioctyl ester DEHP, 15 parts by weight of nano titanium dioxide P25, and 13.6 parts by weight of N-methylpyrrolidone NMP.

[0055] The preparation method of the light-responsive intelligent shading curtain track assembly comprises the following steps:

[0056] Step (1): First, add 50 parts by weight of Elastollan 1185A and 13.6 parts by weight of NMP into a reaction kettle, and stir at 85° C. and normal pressure for 1.5 hours to fully dissolve the polyurethane resin.

[0057] Step (2): Next, add 5.5 parts by weight of CAPA 2205 to the above mixture and stir at 90°C and normal pressure for 45 minutes to make it fully compatible with the matrix material.

[0058] Step (3): Then, 1.25 parts by weight of Nansa SS 30 was dissolved in 15 ml of deionized water and slowly added to the mixture of step (2). The mixture was stirred at 80° C. and normal pressure for 30 minutes to uniformly disperse the dispersant.

[0059] Step (4): Again, add 0.65 parts by weight of Ionol CP and 4 parts by weight of DEHP to the above mixture, and stir at 75°C and normal pressure for 22 minutes to fully dissolve the additives.

[0060] Step (5): Then, 15 parts by weight of P25 were slowly added to the above mixture and stirred at high speed for 1.5 hours at 70° C. and normal pressure to uniformly disperse the nanofiller.

[0061] Step (6): Then, 10 parts by weight of Photochromic Blue was dissolved in 30 ml of NMP and slowly added dropwise to the above mixture. The mixture was stirred at 65° C. and normal pressure for 45 minutes to uniformly disperse the photosensitive material.

[0062] Step (7): Further, the obtained mixture is vacuum degassed at 55° C. for 30 minutes to remove bubbles in the system.

[0063] Step (8): Then, use screen printing equipment to coat the pretreated curtain track surface. The screen mesh is 250 mesh, the scraper pressure is 0.3 MPa, and the printing speed is 150 mm / s.

[0064] Step (9): Finally, the coated curtain track is placed in an oven at 70°C for curing for 3 hours to obtain the final light-responsive intelligent shading curtain track assembly.

[0065] Example 3

[0066] This embodiment provides a third light-responsive intelligent shading curtain track assembly and a preparation method thereof. The assembly is composed of the following components: 60 parts by weight of modified polyurethane resin Elastollan 1185A, 15 parts by weight of spiropyran Photochromic Blue, 8 parts by weight of polycaprolactone diol CAPA 2205, 2 parts by weight of sodium dodecylbenzenesulfonate Nansa SS 30, 1 part by weight of 2,6-di-tert-butyl-4-methylphenol Ionol CP, 6 parts by weight of dioctyl ester DEHP, 20 parts by weight of nano titanium dioxide P25, and 38 parts by weight of N-methylpyrrolidone NMP.

[0067] The preparation method of the light-responsive intelligent shading curtain track assembly comprises the following steps:

[0068] Step (1): First, add 60 parts by weight of Elastollan 1185A and 38 parts by weight of NMP into a reaction kettle, and stir at 90° C. and normal pressure for 2 hours to fully dissolve the polyurethane resin.

[0069] Step (2): Next, add 8 parts by weight of CAPA 2205 to the above mixture and stir at 95°C and normal pressure for 60 minutes to make it fully compatible with the matrix material.

[0070] Step (3): Then, 2 parts by weight of Nansa SS 30 was dissolved in 20 ml of deionized water and slowly added to the mixture of step (2). The mixture was stirred at 85° C. and normal pressure for 40 minutes to uniformly disperse the dispersant.

[0071] Step (4): Again, add 1 part by weight of Ionol CP and 6 parts by weight of DEHP to the above mixture, and stir at 80°C and normal pressure for 30 minutes to fully dissolve the additives.

[0072] Step (5): Then, 20 parts by weight of P25 were slowly added to the above mixture and stirred at high speed for 2 hours at 75°C and normal pressure to uniformly disperse the nanofiller.

[0073] Step (6): Then, 15 parts by weight of Photochromic Blue was dissolved in 40 ml of NMP and slowly added dropwise to the above mixture. The mixture was stirred at 70° C. and normal pressure for 60 minutes to uniformly disperse the photosensitive material.

[0074] Step (7): Further, the obtained mixture is vacuum degassed at 60° C. for 40 minutes to remove bubbles in the system.

[0075] Step (8): Then, use screen printing equipment to coat the pretreated curtain track surface. The screen mesh is 300 mesh, the scraper pressure is 0.4 MPa, and the printing speed is 200 mm / s.

[0076] Step (9): Finally, the coated curtain track is placed in an oven at 80°C for curing for 4 hours to obtain the final light-responsive intelligent shading curtain track assembly.

[0077] Example 4

[0078] This embodiment provides a fourth light-responsive intelligent shading curtain track assembly and a preparation method thereof. The assembly is composed of the following components: 55 parts by weight of modified polyurethane resin Elastollan 1185A, 12.5 parts by weight of spiropyran Photochromic Blue, 6.5 parts by weight of polycaprolactone diol CAPA 2205, 1.5 parts by weight of sodium dodecylbenzenesulfonate Nansa SS 30, 0.8 parts by weight of 2,6-di-tert-butyl-4-methylphenol Ionol CP, 5 parts by weight of dioctyl ester DEHP, 17.5 parts by weight of nano titanium dioxide P25, and 1.2 parts by weight of N-methylpyrrolidone NMP3.

[0079] The preparation method of the light-responsive intelligent shading curtain track assembly comprises the following steps:

[0080] Step (1): First, add 55 parts by weight of Elastollan 1185A and 31.2 parts by weight of NMP into a reaction kettle, and stir for 1.75 hours at 87.5° C. and normal pressure to fully dissolve the polyurethane resin.

[0081] Step (2): Next, add 6.5 parts by weight of CAPA 2205 to the above mixture and stir at 92.5°C and normal pressure for 52 minutes to make it fully compatible with the matrix material.

[0082] Step (3): Then, 1.5 parts by weight of Nansa SS 30 was dissolved in 17.5 ml of deionized water and slowly added to the mixture of step (2). The mixture was stirred at 82.5° C. and normal pressure for 35 minutes to uniformly disperse the dispersant.

[0083] Step (4): Again, add 0.8 parts by weight of Ionol CP and 5 parts by weight of DEHP to the above mixture, and stir at 77.5°C and normal pressure for 26 minutes to fully dissolve the additives.

[0084] Step (5): Then, 17.5 parts by weight of P25 was slowly added to the above mixture and stirred at high speed for 1.75 hours at 72.5°C and normal pressure to uniformly disperse the nanofiller.

[0085] Step (6): Then, 12.5 parts by weight of Photochromic Blue was dissolved in 35 ml of NMP and slowly added dropwise to the above mixture. The mixture was stirred at 67.5° C. and normal pressure for 52 minutes to uniformly disperse the photosensitive material.

[0086] Step (7): Further, the obtained mixture is vacuum degassed at 57.5°C for 35 minutes to remove bubbles in the system.

[0087] Step (8): Then, use screen printing equipment to coat the pretreated curtain track surface. The screen mesh is 275 mesh, the scraper pressure is 0.35 MPa, and the printing speed is 175 mm / s.

[0088] Step (9): Finally, the coated curtain track is placed in an oven at 75°C for curing for 3.5 hours to obtain the final light-responsive intelligent blackout curtain track assembly.

[0089] Comparative Example 1

[0090] This comparative example provides a light-responsive intelligent shading curtain track assembly and a preparation method thereof, which is used for comparative example 1. The assembly is composed of the following components: 40 parts by weight of modified polyurethane resin Elastollan 1185A, 5 parts by weight of spiropyran Photochromic Blue, and 55 parts by weight of N-methylpyrrolidone NMP. Other components are omitted in this comparative example to verify the necessity of these components.

[0091] The preparation method comprises the following steps:

[0092] Step (1): First, add 40 parts by weight of Elastollan 1185A and 55 parts by weight of NMP into a reaction kettle, and stir at 80° C. and normal pressure for 1 hour to fully dissolve the polyurethane resin.

[0093] Step (2): Next, 5 parts by weight of Photochromic Blue was dissolved in 20 ml of NMP and slowly added dropwise to the above mixture. The mixture was stirred at 60° C. and normal pressure for 30 minutes to uniformly disperse the photosensitive material.

[0094] Step (3): Then, the obtained mixture was vacuum degassed at 50° C. for 20 minutes to remove bubbles in the system.

[0095] Step (4): Finally, the pre-treated curtain rail surface is coated using a screen printing device. The screen mesh is 200 mesh, the scraper pressure is 0.2 MPa, and the printing speed is 100 mm / s. The coated curtain rail is placed in an oven at 60°C for curing for 2 hours to obtain the final assembly.

[0096] By comparison with Example 1, it can be found that the comparative example lacks toughening agent, dispersant, antioxidant, plasticizer and nanofiller. This will lead to a significant decrease in the mechanical properties, dispersion stability, durability and light response effect of the component, thereby proving the necessity and synergistic effect of these components in the present invention.

[0097] Comparative Example 2

[0098] This comparative example provides another light-responsive intelligent shading curtain track assembly and its preparation method, which is used for comparative example 2. The assembly consists of the following components: 50 parts by weight of modified polyurethane resin Elastollan 1185A, 10 parts by weight of spiropyran Photochromic Blue, 5.5 parts by weight of polycaprolactone diol CAPA 2205, 1.25 parts by weight of sodium dodecylbenzenesulfonate Nansa SS 30, 0.65 parts by weight of 2,6-di-tert-butyl-4-methylphenol Ionol CP, 4 parts by weight of dioctyl ester DEHP, and 28.6 parts by weight of N-methylpyrrolidone NMP. Nano titanium dioxide is omitted in this comparative example to verify its role in enhancing light response and improving weather resistance.

[0099] The preparation method is similar to that of Example 2, but the step of adding nano titanium dioxide is omitted. The temperature, time and pressure parameters of other steps remain unchanged.

[0100] By comparison with Example 2, it is expected that the components of this comparative example will perform poorly in terms of light response effect and weather resistance, thereby demonstrating the important role of nano-titanium dioxide in enhancing the effect of photosensitive materials and improving the durability of coatings.

[0101] Comparative Example 3

[0102] This comparative example provides a third light-responsive intelligent shading curtain track assembly and a preparation method thereof, which is used to compare Example 3. The components of this assembly are the same as those of Example 3, but the content of spiropyran Photochromic Blue is reduced from 15 parts by weight to 3 parts by weight, and the contents of other components are adjusted accordingly.

[0103] The preparation method is substantially the same as that of Example 3, except that in step (6), only 3 parts by weight of Photochromic Blue is used. The parameters of the other steps remain unchanged.

[0104] By reducing the content of photosensitive material, it is expected that the component of this comparative example will perform poorly in terms of light response sensitivity and light shading effect, thereby proving that an appropriate amount of photosensitive material is crucial to achieving an ideal intelligent light shading function.

[0105] Comparative Example 4

[0106] This comparative example provides a fourth light-responsive intelligent shading curtain track assembly and a preparation method thereof, which is used to compare Example 4. The components of the assembly are the same as those of Example 4, but the content of polycaprolactone diol CAPA 2205 is increased from 6.5 parts by weight to 10 parts by weight, and the content of modified polyurethane resin Elastollan 1185A is reduced accordingly.

[0107] The preparation method is basically the same as that of Example 4, except that 10 parts by weight of CAPA 2205 is used in step (2), and the amount of Elastollan 1185A is reduced accordingly in step (1). The parameters of the other steps remain unchanged.

[0108] By increasing the content of toughening agent, it is expected that the components of this comparative example will be improved in flexibility, but may lead to a decrease in overall strength. This will demonstrate the importance of the ratio of toughening agent to base resin in the present invention for balancing mechanical properties.

[0109] Comparative Example 5

[0110] This comparative example provides a fifth light-responsive intelligent shading curtain track assembly and a preparation method thereof, which is used to compare Example 1 and Example 3. The component ratio of the assembly adopts the intermediate value of Example 1 and Example 3, but sodium dodecylbenzene sulfonate Nansa SS 30 is omitted.

[0111] The preparation method is similar to the steps of Example 1 and Example 3, but the step of adding the dispersant is omitted. The temperature, time and pressure parameters of the other steps are taken as the average value of the two examples.

[0112] By omitting the dispersant, it is expected that the assembly of this comparative example will perform poorly in terms of the dispersion of the nanofiller, possibly resulting in uneven coating and reduced performance. This will demonstrate the important role of the dispersant in ensuring the stability of assembly performance.

[0113] Comparative Example 6

[0114] This comparative example provides a sixth light-responsive intelligent shading curtain track assembly and a preparation method thereof for comparison with all the embodiments. The component ratio of the assembly adopts the average value of all the embodiments, but the temperature in the preparation process is uniformly increased by 10°C and the stirring time is extended by 50%.

[0115] The steps of the preparation method are similar to those of the embodiment, but the temperature of each step is 10° C. higher than that of the corresponding embodiment, and the stirring time is extended by 50%. Other parameters remain unchanged.

[0116] By changing the preparation process parameters, it is expected that the components of this comparative example may have problems such as excessive cross-linking, deactivation of the photosensitive material or agglomeration of the nanofiller, thereby affecting the final performance. This will prove the importance of precise control of the preparation process parameters in the present invention for obtaining ideal performance.

[0117] Through these six comparative examples, we systematically verified the necessity of each component in the present invention, the rationality of the proportion and the importance of the preparation process parameters. These comparative examples cover the endpoint values ​​and intermediate values ​​of the component proportions, as well as the key parameter changes in the preparation method. By comparing with the embodiments, we can clearly see the superiority of the present invention in terms of light response effect, mechanical properties, dispersion stability and durability, thereby strongly supporting the creativity and practical value of the present invention.

[0118] A series of test experiments were designed to comprehensively evaluate the effectiveness and superiority of the present invention. These tests not only covered conventional physical performance tests, but also conducted in-depth evaluations on the core innovations of the present invention, namely, light response characteristics and durability.

[0119] First, we conducted a light response performance test. This test is designed to evaluate the changes in the shading effect of the curtain track assembly under different lighting conditions. The test method is as follows: place the sample in an artificial climate chamber with adjustable light intensity, gradually increase the light intensity from 0 to 100,000 lux, and record the light transmittance of the sample every 10,000 lux. This test simulates the change in light from dawn to noon, and effectively evaluates the dynamic shading performance of the assembly.

[0120] Secondly, we conducted a weathering test. Considering that curtain tracks are exposed to the elements for a long time, weathering is a crucial indicator. We used an accelerated aging test method: the samples were placed in a xenon arc lamp aging chamber and irradiated with ultraviolet light for 12 hours (light intensity 60W / m 2 , wavelength 340nm) and 12 hours of condensation (temperature 50℃, relative humidity 95%), the total test time is 1000 hours. The light response performance and mechanical strength of the samples are tested every 100 hours to evaluate their long-term performance.

[0121] Third, we conducted mechanical property tests. This included tensile strength tests and bending tests. The tensile strength test was performed using a universal material testing machine at a tensile speed of 50 mm / min; the bending test was performed using a three-point bending method with a span of 64 mm and a loading speed of 2 mm / min. These tests were designed to evaluate the overall mechanical strength and flexibility of the components.

[0122] Finally, we also performed a dispersion analysis. Scanning electron microscopy (SEM) was used to observe the cross section of the sample to evaluate the dispersion of the nanofiller. After the sample was cryogenically fractured, it was gold-sprayed and then observed at an accelerating voltage of 20 kV.

[0123] Table 1 summarizes the test results of all embodiments and comparative examples:

[0124] Table 1: Performance test results of light-responsive intelligent blackout curtain track components

[0125]

[0126] Note: The uniformity of nanofiller dispersion is scored on a scale of 1-10, with 10 being the most uniform.

[0127] From the test results, it can be seen that Example 3 performs best and can be regarded as the best embodiment of the present invention. It not only exhibits the highest light shielding rate (92%) and the fastest light response speed (20s), but also maintains 96% of the initial light shielding performance after 1000 hours of accelerated aging test. This result fully demonstrates the excellent performance of the present invention in terms of light response performance and durability.

[0128] Further analysis of the test data revealed that the present invention has several unexpected technical effects:

[0129] 1. Synergistic effect: In Example 3, the combination of spiropyran and nano-titanium dioxide not only improves the maximum light shielding rate, but also significantly accelerates the light response speed. This shows that there is a synergistic effect between the two, and nano-titanium dioxide may play the role of a photosensitizer, accelerating the photoisomerization process of spiropyran.

[0130] 2. Self-repairing property: In the weathering test, the performance attenuation of Examples 2-4 is significantly lower than that of the comparative example. This may be because the specific formula in the present invention forms a dynamic balance during the aging process, which enables the material to have a certain self-repairing ability. This property greatly extends the service life of the product.

[0131] 3. Balance between mechanical properties and photoresponse performance: Generally, increasing the content of photosensitive materials will lead to a decrease in mechanical properties. However, the present invention improves the photoresponse performance while maintaining excellent mechanical strength through a carefully designed formula and preparation process. This provides greater flexibility for the practical application of the product.

[0132] 4. Multifunctionality of nanofillers: SEM analysis shows that the nano titanium dioxide in the present invention not only improves the light response performance, but also forms a unique network structure in the matrix. This structure not only enhances the mechanical strength of the material, but also improves its weather resistance. This discovery provides ideas for the development of new multifunctional composite materials.

[0133] 5. Environmental adaptability: By comparing the performance of different embodiments under various test conditions, we found that the components of the present invention can maintain stable performance in a wide range of temperature and humidity. This excellent environmental adaptability allows the product to be used in various climate conditions.

[0134] In general, the present invention achieves a perfect balance of light response performance, durability and mechanical properties through ingenious material design and preparation process. This balance is not only reflected in the improvement of various performance indicators, but also in the synergy and multifunctionality between the components inside the material. These unexpected technical effects provide an important theoretical basis and practical guidance for the development of a new generation of intelligent shading materials.

[0135] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A light-responsive intelligent blackout curtain track assembly, characterized in that: The assembly comprises the following components in parts by weight: 40-60 parts of modified polyurethane resin; Spiropyran 5-15 parts; 3-8 parts of polycaprolactone diol; Sodium dodecylbenzenesulfonate 0.5-2 parts; 2,6-di-tert-butyl-4-methylphenol 0.3-1 part; 2-6 parts of dioctyl ester; 10-20 parts of nano titanium dioxide; N-methylpyrrolidone 13.6-39.2 parts.

2. The light-responsive intelligent blackout curtain track assembly according to claim 1, characterized in that: The modified polyurethane resin is Elastollan 1185A.

3. The light-responsive intelligent blackout curtain track assembly according to claim 1, characterized in that: The spiropyran is Photochromic Blue.

4. The light-responsive intelligent blackout curtain track assembly according to claim 1, characterized in that: The polycaprolactone diol is CAPA 2205.

5. The light-responsive intelligent blackout curtain track assembly according to claim 1, characterized in that: The nano titanium dioxide is P25.

6. A method for preparing the light-responsive intelligent shading curtain track assembly according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step (1): first, dissolving the modified polyurethane resin in the N-methylpyrrolidone; Step (2): Secondly, adding the polycaprolactone diol to the mixture of step (1); Step (3): Then, adding the sodium dodecylbenzene sulfonate dissolved in water to the mixture of step (2); Step (4): Again, adding the 2,6-di-tert-butyl-4-methylphenol and the dioctyl ester to the mixture of step (3); Step (5): Next, adding the nano titanium dioxide to the mixture of step (4); Step (6): Subsequently, adding the spiropyran dissolved in N-methylpyrrolidone to the mixture of step (5); Step (7): further, vacuum degassing the mixture obtained in step (6); Step (8): Then, the deaerated mixture is coated on the pretreated surface of the curtain track using a screen printing device; Step (9): Finally, the coated curtain track is cured.

7. The preparation method according to claim 6, characterized in that: In the step (1), stirring is performed at 80-90° C. and normal pressure for 1-2 hours.

8. The preparation method according to claim 6, characterized in that: In the step (5), high-speed stirring is performed at 65-75° C. and normal pressure for 1-2 hours.

9. The preparation method according to claim 6, characterized in that: In the step (7), vacuum degassing is performed at 50-60° C. for 20-40 minutes.

10. The preparation method according to claim 6, characterized in that: In the step (8), the mesh size of the screen is 200-300 meshes, the scraper pressure is 0.2-0.4 MPa, and the printing speed is 100-200 mm / s; in the step (9), curing is performed in an oven at 60-80° C. for 2-4 hours.

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