CN112680969B - Light response intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, and preparation method and application thereof - Google Patents
Light response intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, and preparation method and application thereof Download PDFInfo
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Abstract
本发明属于光致变色材料技术领域，公开了一种具有紫外光强度检测及防护功能的光响应智能液晶变色纤维及其制备方法和应用。该光响应智能液晶变色纤维是将母体液晶、光响应性手性添加剂和非光响应性手性添加剂按比例混匀形成光响应液晶体系；将高分子聚合物与溶剂混匀得聚合物溶液；通过同轴涂覆的方法使纤维单丝先后经过光响应液晶体系和聚合物溶液，形成同轴的聚合物层、光响应液晶层和纤维单丝，构成三层皮芯结构；本发明的光响应智能液晶变色纤维变色层次丰富、色差明显、耐久性好、用于户外紫外光的检测与及紫外光与蓝光防护。The invention belongs to the technical field of photochromic materials, and discloses a light-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, and a preparation method and application thereof. The light-responsive intelligent liquid crystal color-changing fiber is formed by mixing the parent liquid crystal, the light-responsive chiral additive and the non-light-responsive chiral additive in proportion to form a light-responsive liquid crystal system; and mixing the high molecular polymer and the solvent to obtain a polymer solution; Through the coaxial coating method, the fiber monofilament passes through the light-responsive liquid crystal system and the polymer solution successively to form a coaxial polymer layer, a light-responsive liquid crystal layer and a fiber monofilament to form a three-layer skin-core structure; Responsive intelligent liquid crystal color-changing fiber has rich discoloration layers, obvious color difference, good durability, and is used for outdoor ultraviolet light detection and ultraviolet light and blue light protection.
Description
Technical Field
The invention belongs to the technical field of photochromic materials, relates to a photoresponse liquid crystal color-changing fiber, and particularly relates to a photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, and a preparation method and application thereof.
Background
Ultraviolet rays in sunlight and blue light emitted by common electronic equipment can cause different and irreversible damages to human retinas, and especially, the skin can be burnt and skin cancer can be caused by the high intensity of the ultraviolet rays in the sunlight. The harmful light which is abundantly existed in daily life is unconsciously harmful to the health of people. Therefore, it is urgent to develop a UV and blue light protective product that is easy to prepare, low in cost, portable, and capable of detecting the intensity of UV and blue light.
The photochromic material is widely applied in the aspects of light detection and protection, can generate reversible color change under illumination with specific wavelength or intensity, and is applied to a plurality of fields such as light indication, safety warning, anti-counterfeiting, fashion, military camouflage and the like. The traditional photochromic materials are divided into organic materials and inorganic materials, wherein the organic materials are spiropyran derivatives, azobenzene derivatives and the like, and the materials have the advantages of quick color change, complex preparation process, poor thermal stability and oxidation resistance, low fatigue resistance and large environmental influence; inorganic materials such as single crystal doped SrTiO3 overcome the disadvantages of organic photochromic materials, but have slow color development and decoloration, large particle size and single color change.
Therefore, the development of photochromic materials with simple preparation process, rich color change layers, obvious color difference, good durability and good cyclability, and the photoresponse intelligent liquid crystal photochromic fiber which can detect the light intensity of ultraviolet light and is used for outdoor ultraviolet light protection and blue light protection has important significance for popularizing the industrialization of the photochromic fiber.
Disclosure of Invention
The invention aims to provide a photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, so as to achieve the purposes of absorbing harmful ultraviolet light in outdoor sunlight, rapidly responding and reversibly changing color, rapidly returning to an initial structure to reflect harmful blue light after leaving the outdoor sunlight environment, detecting the ultraviolet intensity in sunlight and protecting ultraviolet light;
another object of the present invention is to provide a method for preparing the above-mentioned photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, which achieves the purposes of simple preparation and pattern editing by a coaxial coating method;
the invention also aims to provide an application of the light-response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions is characterized by comprising the following steps of:
I. preparation of photoresponsive liquid crystal systems and polymer solutions:
uniformly mixing the parent liquid crystal, the photoresponsive chiral additive and the non-photoresponsive chiral additive to obtain a photoresponsive liquid crystal system;
mixing and dissolving a high molecular polymer and a solvent to obtain a polymer solution;
the solvent is at least one of water, ethanol, acetone, dichloromethane and dimethylformamide;
II, preparing the liquid crystal color-changing fiber:
and (3) drafting the fiber monofilaments to enable the fiber monofilaments to pass through the photoresponse liquid crystal system and the polymer solution in sequence, and drying to obtain the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions.
The preparation method is a coaxial coating method; the drafting speed of the fiber monofilament can be constant speed or variable speed, so that the prepared photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can be subjected to thickness and pattern editing.
As a limitation of the present invention, the raw materials constituting the polymer layer include a transparent, bendable and fiberizable high molecular polymer and a solvent;
the solvent is at least one of water, ethanol, acetone, dichloromethane and dimethylformamide;
the fiber monofilament is a spinnable fiber monofilament.
Wherein the high molecular polymer is one of polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), alginate fiber, carboxymethyl cellulose fiber, waterborne polyurethane, polymethyl methacrylate (PMMA), Polystyrene (PS), Polyacrylonitrile (PAN), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), Polyethylene (PE), polyvinyl chloride (PVC), Polyurethane (PU) or Polyimide (PI);
the fiber monofilament is one of polyester fiber, polypropylene fiber or polyamide fiber, and can select various colors including black, white, red, orange, yellow, green, blue, purple or transparent.
As a second limitation of the present invention, the ratio of the parent liquid crystal, the photo-responsive chiral additive and the non-photo-responsive chiral additive is 60-99: 1-15: 0-45.
Wherein the parent liquid crystal is one or two of 5CB, E7, E8, SCL1717 or BLO 38.
As a third limitation of the present invention, the mother liquid crystal is a nematic liquid crystal monomer and/or a cholesteric liquid crystal monomer, and the temperature range of the mother liquid crystal is-50 to 250 ℃.
As a fourth limitation of the present invention, the light-responsive chiral additive is a diarylethene-based ultraviolet light-responsive chiral compound, a fulgide-based ultraviolet light-responsive chiral compound, a spiropyran-based ultraviolet light-responsive chiral compound, a spirooxazine-based ultraviolet light-responsive chiral compound, an azobenzene-based ultraviolet light-responsive chiral compound, a schiff base-based ultraviolet light-responsive chiral compound, a dithienylethene-based ultraviolet light-responsive chiral compound, or a spiroalkene-based ultraviolet light-responsive chiral compound.
As a fifth limitation of the present invention, the non-photoresponsive chiral additive is R5011, S5011, R811, S811, R1011, S1011, R3011, S3011 or CB 15.
As a further limitation, the non-photoresponsive chiral additive is one of R5011, S5011, R811, S811, R1011, S1011, R3011, S3011 and CB 15.
The invention also provides the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions, which is prepared by the preparation method and is a three-layer skin-core structure formed by a coaxial polymer layer, a photoresponse liquid crystal layer and fiber monofilaments; the fiber monofilaments are used as core filaments, the photoresponse liquid crystal layer covers the periphery of the core filaments, and the polymer layer covers the periphery of the photoresponse liquid crystal layer.
Wherein the fiber monofilament cross-section may be circular or non-circular.
As a definition of the invention, the ratio between the radial thickness of the polymer layer, the radial thickness of the photoresponsive liquid crystal layer and the diameter of the fiber monofilaments is between 1 and 100: 1-100: 50-2000.
The invention also provides an application of the light-response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions, and the light-response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can be applied to ultraviolet light detection and ultraviolet light/blue light protection, and can be used for preparing anti-counterfeiting identification elements and fashion design materials through pattern editing and weaving.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
(1) when the light response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions is in a natural environment, the ultraviolet light in sunlight can regulate and control the color change, and the intelligent color change that the initial color is recovered when the fiber leaves the ultraviolet light environment is realized; the color-changing layer is rich, the color-changing range is wide, the color-changing layer covers the whole visible light range, and the color-changing layer can be red, orange, yellow, green, cyan, blue, purple or colorless; the color change can be repeatedly cycled for at least 1000 times;
(2) the color of the light response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can be changed along with the ultraviolet light intensity, so that the light response intelligent liquid crystal color-changing fiber can detect the ultraviolet light intensity according to the color change sensitivity, and can respond to weak ultraviolet light intensity; wherein, the light-responsive chiral additive can absorb ultraviolet light, thereby realizing the ultraviolet light protection function;
(3) the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can enable the initial structure of the color-changing fiber to reflect harmful blue light by adjusting the raw material proportion of the photoresponse liquid crystal layer and the fiber monofilament structure, and realizes certain indoor blue light detection and protection functions; the initial color and the light stable color of the photoresponse intelligent liquid crystal color-changing fiber can be adjusted by adjusting the raw material proportion and matching different fiber monofilaments;
(4) the preparation method of the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions adopts a coaxial coating method, has simple preparation process and good output effect, and can be produced in batch;
(5) the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can form various patterns through pattern editing and weaving, has good mechanical strength and fastness, and can be applied to the fields of protection, anti-counterfeiting marks, fashion design and the like.
Drawings
The invention will be described in more detail with reference to the following figures and embodiments:
the accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention;
fig. 1 is a schematic diagram of the operating principle of an initial state and a light excitation steady state of a photo-responsive intelligent liquid crystal color-changing fiber X1 with ultraviolet intensity detection and protection functions, which is manufactured in embodiment 1 of the present invention;
fig. 2 is a schematic cross-sectional structure view of a photo-responsive intelligent liquid crystal color-changing fiber X1 with ultraviolet light intensity detection and protection functions, which is manufactured in embodiment 1 of the present invention;
fig. 3 is a structural photograph of a photo-responsive intelligent liquid crystal color-changing fiber X1 with ultraviolet light intensity detection and protection functions, which is obtained in example 1 of the present invention, after being magnified at different magnifications;
fig. 4 is a graph showing the color change result of the photo-responsive intelligent liquid crystal color-changing fiber X9 with ultraviolet light intensity detection and protection functions in sunlight, which is prepared in example 9 of the present invention;
fig. 5 is a color change diagram of the photo-responsive intelligent liquid crystal color-changing fiber X1 with ultraviolet light intensity detection and protection functions according to embodiment 11 of the present invention under different ultraviolet light intensities;
fig. 6 is a diagram showing a result of detecting the blue light protection performance of the photo-responsive intelligent liquid crystal color-changing fiber X2 having ultraviolet light intensity detection and protection functions in embodiment 12 of the present invention;
fig. 7 is a diagram showing a result of detecting the blue light protection performance of the photo-responsive intelligent liquid crystal color-changing fiber X2 having ultraviolet light intensity detection and protection functions in embodiment 12 of the present invention;
in the figure, 1, nylon fiber monofilament; 2. a light responsive liquid crystal layer; 3. a PU polymer layer.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description of the preferred embodiment is only for purposes of illustration and understanding, and is not intended to limit the invention.
Embodiment 1 preparation method of photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions
The embodiment prepares a photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions, and the specific steps are as follows:
I. preparation of photoresponsive liquid-crystal layer systems and polymer layer solutions:
uniformly mixing 95.4kg of mother liquid crystal BLO38 (temperature range of-50-250 ℃), 2.5kg of light-responsive chiral additive M10 and 2.6kg of non-light-responsive chiral additive R5011 to obtain a light-responsive liquid crystal layer system;
uniformly mixing 20kg of high molecular polymer PU with 100kg of ethanol serving as a solvent to obtain a polymer layer solution;
II, preparing the liquid crystal color-changing fiber:
selecting black nylon with a circular section with the diameter of 200 mu m as a fiber monofilament, drawing at the speed of 2mm/s, enabling the fiber monofilament to pass through a photoresponse liquid crystal layer system and a polymer layer solution in sequence, and drying for 30min at the temperature of 60 ℃ to obtain the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions, wherein the label is X1;
FIG. 1 is a schematic diagram of the operating principle of photo-responsive intelligent liquid crystal color-changing fiber X1 in initial state and photo-excited steady state with ultraviolet light intensity detection and protection functions, wherein under indoor conditions, X1 is in initial state, and reflects indoor blue light to realize blue light protection; under outdoor sunlight conditions, X1 is in a light excitation stable state and absorbs outdoor ultraviolet light to realize ultraviolet light protection;
x1 has a three-layer sheath-core structure, as in fig. 2, comprising a polymer layer having a coaxial structure, a light responsive liquid crystal layer, and fiber monofilaments; the fiber monofilaments are core layers with the thickness of 200 mu m, the fiber monofilaments are wrapped with a photoresponse liquid crystal layer with the thickness of 20 mu m, and the photoresponse liquid crystal layer is wrapped with a polymer layer with the thickness of 10 mu m; observing X1 under the condition of magnification of a scanning electron microscope, wherein the structure is shown in FIG. 3, and X1 has a three-layer core-skin structure;
wherein the structural formula of the light-responsive chiral additive M10 is as follows:
the photo-responsive intelligent liquid crystal color-changing fiber X1 with the ultraviolet light intensity detection and protection functions can be applied to ultraviolet light detection and protection, anti-counterfeiting identification elements and fashion design through pattern editing and weaving.
Embodiment 2-8 preparation method of photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions
Examples 2 to 8 are methods for preparing photo-responsive intelligent liquid crystal color-changing fibers with ultraviolet light intensity detection and protection functions, respectively, and the preparation methods are similar to example 1, except that fine adjustment and process parameters of common knowledge in the art are combined in the preparation process, and the different process parameters are shown in table 1:
table 1 examples 2-8 process parameters
Wherein the temperature range of the mother liquid crystal is-50-250 ℃.
Embodiment 9 a method for preparing a photo-responsive smart liquid crystal color-changing fiber with editable patterns and ultraviolet light intensity detection and protection functions
The specific steps of preparing the photoresponse intelligent liquid crystal color-changing fiber with the pattern editable and having the ultraviolet light intensity detection and protection functions, wherein the thickness of the liquid crystal fiber coating layer is in gradient change, are basically the same as those of the embodiment 1, except that in the step II, the drafting rate of fiber monofilaments passing through a photoresponse liquid crystal layer system and a polymer layer solution is different, the drafting rate is uniformly increased from 2mm/s to 20mm/s, and the prepared photoresponse intelligent liquid crystal color-changing fiber is marked as X9; the thickness of the photoresponse liquid crystal layer and the thickness of the polymer layer are in gradient change, and the color change is shown as the color change shown in figure 4 under the irradiation of outdoor sunlight, namely the color can be recovered to the initial color after leaving the outdoor sunlight environment, the color change is rapid, and the color change is obvious only 20 s; the fiber prepared by the method can form a fabric with abundant patterns by weaving.
Example 10 light response experiment of light response Intelligent liquid Crystal color changing fiber with ultraviolet light intensity detection and protection function
The embodiment prepares 7 photoresponse intelligent liquid crystal color-changing fibers with ultraviolet light intensity detection and protection functions, which are sequentially marked as X10-X16, and the specific steps are basically the same as the embodiment 1, except that the proportions of the raw materials of the photoresponse liquid crystal layer are different, and the specific proportions are shown in Table 2;
at ultraviolet light intensity of 0.5mW/cm2Under the conditions, the photoresponse color change conditions of X10-X16 are detected by measuring the initial state color and the light steady state color of X10-X16, and the specific results are shown in Table 2:
TABLE 2X10-X16 ratio of raw materials for photoresponsive liquid crystal layer and photoresponsive color change
The result shows that the initial color and the light stable color of the light response intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can be controlled by adjusting the proportion of the raw materials of the light response liquid crystal layer.
Example 11 ultraviolet light intensity detection experiment of photo-responsive Intelligent liquid Crystal color-changing fiber with ultraviolet light intensity detection and protection function
The light-responsive intelligent liquid crystal color-changing fibers X1-X8 with the functions of detecting and protecting ultraviolet light intensity, prepared in examples 1-8, are respectively placed at 0-0.8mW/cm2Under the condition of ultraviolet light with different light intensities, the color change is recorded, and the result shows that:
examples 1-8 the photo-responsive smart liquid crystal color-changing fibers X1-X8 with uv intensity detection and protection functions, all of which can achieve protection against harmful blue light by reflecting blue light and have sensitive color change of 0.05mW/cm2The color of the light source is obviously changed under the ultraviolet light intensity, the color change is various, and the displayed color covers the whole visible light area; meanwhile, the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions can be used for detecting the ultraviolet light intensity and is sensitive to different light intensity indications; for example:
the experimental result of the photo-response intelligent liquid crystal color-changing fiber X1 with the ultraviolet light intensity detection and protection functions, which is prepared by the embodiment, is shown in figure 5, harmful blue light in a reflecting chamber before being irradiated by ultraviolet light is blue-purple; under the ultraviolet light intensity of 0.05-0.1mW/cm2I.e. appear green; the ultraviolet intensity is 0.12-0.2mW/cm2Presenting a yellow-green color; under the ultraviolet intensity of 0.22-0.4mW/cm2The color is yellow; the ultraviolet intensity is 0.42-0.6mW/cm2The color is orange yellow; under the ultraviolet light intensity of 0.05-0.1mW/cm2I.e. appears red.
Example 12 ultraviolet light and blue light protection performance test of photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions
One) detection of ultraviolet protection factor
The photoresponse intelligent liquid crystal color-changing fibers X1-X8 with the ultraviolet intensity detection and protection functions, prepared in the embodiments 1-8, are respectively woven into fabrics Y1-Y8 with the thickness of 1 mm; in addition, the photoresponse intelligent liquid crystal color-changing fiber X2 with the ultraviolet light intensity detection and protection functions, prepared in the embodiment 2 of the invention, is woven into a fabric Y22 with the thickness of 2 mm.
The ultraviolet protection coefficients (namely UPF values) of the fabrics Y1-Y8 and Y22 are detected according to a conventional method;
the detection result is as follows: fabric Y1 had a UPF value of 4259.12; fabric Y2 had a UPF value of 4830.57; fabric Y22 had a UPF value of 7932; fabric Y3 had a UPF value of 4152.73; fabric Y4 had a UPF value of 4126.15; fabric Y5 had a UPF value of 4378.47; fabric Y6 had a UPF value of 4145.86; fabric Y7 had a UPF value of 4164.3; fabric Y8 had a UPF value of 4252.73.
The above results indicate that the fabrics made from the photo-responsive intelligent liquid crystal color-changing fibers X1-X8 with ultraviolet intensity detection and protection functions prepared in examples 1 to 8 have high ultraviolet protection coefficient and good ultraviolet protection effect, and the ultraviolet protection effect is remarkably enhanced with the increase of the thicknesses of the liquid crystal layer and the fiber fabrics.
II) blue light protection Performance detection
The light-responsive intelligent liquid crystal color-changing fibers X1-X8 with ultraviolet light intensity detection and protection functions prepared in examples 1-8 were tested for light emission and absorption properties according to a conventional test method. The result proves that the blue-light-absorbing material can reflect 40% of harmful blue light, has good blue light protection performance and has an absorption effect on ultraviolet light; for example:
by detecting the absorption and reflection conditions of the photo-responsive intelligent liquid crystal color-changing fiber X2 with the ultraviolet light intensity detection and protection functions, which is prepared in embodiment 2 of the invention, to different wavelengths of light, the blue light protection performance of X2 is indicated, and the result is shown in the data diagram of reflexion in FIGS. 6-7; as can be seen from fig. 6 to 7, the photo-responsive intelligent liquid crystal color-changing fiber X2 with ultraviolet light intensity detection and protection functions prepared in example 2 can reflect 40% of harmful blue light, has good blue light protection performance, and has an absorption effect on ultraviolet light.
The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. The technical equivalents of the modifications and equivalents of the features of the present invention, which may be introduced into the technical scope of the present invention or partially substituted, are also included in the scope of the claims of the present invention.
Claims (6)
1. A preparation method of a photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions is characterized by comprising the following steps of:
I. preparation of photoresponsive liquid crystal systems and polymer solutions:
uniformly mixing the parent liquid crystal, the photoresponsive chiral additive and the non-photoresponsive chiral additive to obtain a photoresponsive liquid crystal system;
mixing and dissolving a high molecular polymer and a solvent to obtain a polymer solution;
II, preparing the liquid crystal color-changing fiber:
drafting the fiber monofilament to pass through the photoresponse liquid crystal system and the polymer solution in sequence, and drying to obtain the photoresponse intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions;
step II is a coaxial coating method; the drawing speed of the fiber monofilament is variable speed, so that the prepared photoresponse intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions is subjected to thickness and pattern editing;
the weight part ratio of the parent liquid crystal, the light-responsive chiral additive and the non-light-responsive chiral additive is 60-99: 1-15: 0 to 45 parts;
the parent liquid crystal is a nematic liquid crystal monomer and/or a cholesteric liquid crystal monomer, and the temperature range of the parent liquid crystal is-50-250 ℃;
the light-responsive chiral additive is a diaryl ethylene ultraviolet light-responsive chiral compound, a fulgide ultraviolet light-responsive chiral compound, a spiropyran ultraviolet light-responsive chiral compound, a spirooxazine ultraviolet light-responsive chiral compound, an azobenzene ultraviolet light-responsive chiral compound, a Schiff base ultraviolet light-responsive chiral compound, a dithioethylene ultraviolet light-responsive chiral compound or a spiroalkene ultraviolet light-responsive chiral compound.
2. The method for preparing the photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet intensity detection and protection functions as claimed in claim 1,
the raw material of the high molecular polymer is transparent high molecular polymer;
the solvent is at least one of ethanol, acetone, dichloromethane and dimethylformamide;
the fiber monofilament is a spinnable fiber monofilament.
3. The method for preparing the photo-responsive intelligent liquid crystal color-changing fiber with the functions of detecting the ultraviolet light intensity and protecting the ultraviolet light intensity as claimed in claim 1 or 2, wherein the non-photo-responsive chiral additive is R5011, S5011, R811, S811, R1011, S1011, R3011, S3011 or CB 15.
4. The light-responsive intelligent liquid crystal color-changing fiber with the ultraviolet light intensity detection and protection functions is characterized by being prepared by the preparation method of any one of claims 1 to 3, and is of a three-layer sheath-core structure formed by a polymer layer, a light-responsive liquid crystal layer and fiber monofilaments which are coaxial, wherein the fiber monofilaments are core filaments, the light-responsive liquid crystal layer covers the periphery of the core filaments, and the polymer layer covers the periphery of the light-responsive liquid crystal layer.
5. The photo-responsive intelligent liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions as claimed in claim 4, wherein the ratio of the radial thickness of the polymer layer, the radial thickness of the photo-responsive liquid crystal layer and the diameter of the fiber monofilament is 1-100: 1-100: 50-2000.
6. The use of the photo-responsive smart liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions as claimed in claim 4 or 5, wherein the photo-responsive smart liquid crystal color-changing fiber with ultraviolet light intensity detection and protection functions is subjected to pattern editing and weaving, and is used for ultraviolet light detection and ultraviolet light/blue light protection, the preparation of anti-counterfeiting identification elements and fashion design materials.
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| CN114908575B (en) * | 2022-06-21 | 2023-06-16 | 江南大学 | A liquid crystal anti-ultraviolet finishing agent and its application on textiles |
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