High-performance photochromic composite fabric and preparation process thereof

Abstract

The invention discloses a high-performance photochromic composite fabric and a preparation process thereof, and relates to the technical field of photochromic composite fabrics, the high-performance photochromic composite fabric is composed of a longitudinal fiber layer, a waterproof layer, combed cotton, cool fibers and a photochromic fiber layer; the longitudinal fiber layer is formed by interweaving chinlon and spandex, a waterproof layer is sprayed on the top of the longitudinal fiber layer, a photochromic fiber layer is connected to the top of the waterproof layer in a hot-pressing mode, combed cotton is connected to the bottom of the longitudinal fiber layer in a knitted mode, and cool fibers are connected to the bottom of the combed cotton in a knitted mode; and the surface of the photochromic fiber layer is coated with an ultraviolet light absorber. According to the photochromic composite fabric, the ultraviolet light absorber is sprayed on the surface of the photochromic composite fabric to fill gaps among the photochromic fiber layers, so that the number of ultraviolet rays reaching the photochromic material is reduced in the subsequent use process, the damage degree of the photochromic material due to photodegradation is reduced, and the service life of the fabric is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of photosensitive color-changing composite fabrics, and in particular to a high-performance photosensitive color-changing composite fabric and a preparation process thereof. Background Art

[0002] As a new type of high-tech fabric, photochromic composite fabric has attracted widespread attention in the textile industry and science and technology field in recent years. This type of fabric can change color when exposed to light. This unique property gives it broad application prospects in many fields. However, the existing photochromic composite fabric is prone to damage to the photochromic material due to photodegradation when used for a long time, and has certain defects.

[0003] The defects of existing photosensitive color-changing composite fabrics are: 1. In the patent document CN113737294B, the main consideration is how to improve the photochromic effect of the fabric, but it does not take into account that the existing photochromic composite fabric is easily damaged due to photodegradation when used for a long time; 2. In the patent document CN209666511U, the main consideration is how to improve the warmth retention of the fabric, but it does not take into account that the existing photochromic composite fabric cannot arbitrarily add a shading layer according to the needs of use to improve the shading effect of the fabric; 3. In the patent document CN214164346U, the main consideration is how to increase the comfort of the fabric, and the poor chemical environment resistance and fatigue resistance of the photosensitive color-changing dyes of the existing photosensitive color-changing composite fabrics are not taken into account; 4. In the patent document CN209722568U, the main consideration is how to improve the washability of the fabric, and it does not take into account that the existing photochromic composite fabric has a relatively single function. Summary of the invention

[0004] The purpose of the present invention is to provide a high-performance photosensitive color-changing composite fabric and a preparation process thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a high-performance photochromic composite fabric, the high-performance photochromic composite fabric consisting of a longitudinal fiber layer, a waterproof layer, combed cotton, cool fibers and a photochromic fiber layer; The longitudinal fiber layer is interwoven with nylon and spandex, a waterproof layer is sprayed on the top of the longitudinal fiber layer, a photosensitive color-changing fiber layer is hot-pressed on the top of the waterproof layer, combed cotton is knitted on the bottom of the longitudinal fiber layer, and cool fiber is knitted on the bottom of the combed cotton; The surface of the photochromic fiber layer is coated with an ultraviolet absorber.

[0006] Preferably, polyester cloth is knitted and connected to the surfaces of both sides of the composite fabric, a female buckle is connected to the bottom of the polyester cloth, a male buckle is engaged with the bottom of the female buckle, and a blackout cloth is connected to the top of the male buckle. When the male buckle is engaged with the female buckle, the surface of the polyester cloth is flush with the surface of the blackout cloth and the thickness is consistent.

[0007] Preferably, the interweaving ratio of nylon and spandex is 1:0.15.

[0008] Preferably, the preparation process of the high-performance photosensitive color-changing composite fabric is as follows: S1. Raw material preparation; S2, first prepare a photochromic slurry, add it to a spinning solution, then weave it into silk, then mix it with synthetic fibers and send it into a loom for spinning to obtain a photochromic fiber layer, and coat the surface of the photochromic fiber layer with a layer of ultraviolet absorber; S3, preparing a longitudinal fiber layer by interweaving nylon and spandex, and preparing combed cotton and cool fiber; S4, preparing a waterproof layer, spraying polyurethane on the top surface of the longitudinal fiber layer, and then drying and curing to form a waterproof film, that is, obtaining a waterproof layer; S5, laminating the waterproof layer between the longitudinal fiber layer and the photochromic fiber layer by heat pressing to obtain a partial composite fabric; S6, knitting part of the composite fabric obtained in S5 with the prepared combed cotton and the cool fiber in sequence to form a complete composite fabric; S7. Then, a polyester cloth is knitted on the outer surface of the composite fabric, and a female buckle is sewn on the bottom of the polyester cloth. When the prepared photochromic composite material is used to produce curtains or car seat fabrics, the blackout cloth can be fixed on the composite fabric by engaging the male buckle and the female buckle.

[0009] Preferably, the synthetic fibers include polyester and nylon.

[0010] Preferably, in S2, the preparation method of the photosensitive color-changing slurry is as follows: S2-1. Prepare a thickener, a binder, cellulose, photochromic dye capsule powder and water; S2-2. Mix the materials prepared in S2-1 in a mass ratio of 1:2:1.5:2:4.5 to form a photosensitive color-changing slurry.

[0011] Preferably, the photochromic dye capsule powder is prepared by encapsulating the photochromic dye in capsules using microencapsulation technology to obtain microcapsules, and the microcapsules are filtered, washed and dried to obtain the photochromic dye capsule powder.

[0012] Preferably, in S3, the combed cotton is knitted together with the elastic polyester fiber and the cotton fiber using a double-sided weaving process.

[0013] Preferably, the cooling fiber is introduced into the mineral masterbatch using polyester or nylon as a carrier.

[0014] Preferably, the thickener is sodium alginate, the adhesive is a polyurethane adhesive, and the cellulose is cotton cellulose.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sprays ultraviolet absorbers on the surface of the photochromic composite fabric to fill the gaps between the photochromic fiber layers, so that in the subsequent use process, the ultraviolet absorbers can preferentially absorb ultraviolet rays and convert them into harmless heat energy or other low-energy forms, thereby reducing the amount of ultraviolet rays reaching the photochromic material and reducing the degree of damage to the photochromic material due to light degradation, thereby extending the service life of the fabric.

[0016] 2. The present invention arranges detachable polyester cloth on both sides of the composite fabric, and adds male buckles and female buckles as needed, so that the shading cloth can be conveniently fixed on the composite fabric through the engagement of the male buckles and the female buckles, thereby improving the shading performance of the fabric.

[0017] 3. The present invention uses microcapsule technology to encapsulate the photochromic dye in capsules to isolate the chemical environment such as acid, alkali, mixed colors, air, etc., increase the chemical environment resistance and fatigue resistance of the photosensitive color-changing dye, and improve its light stability and the service life of the textile.

[0018] 4. The present invention combines the advantages of cotton fiber and elastic polyester fiber through a double-sided weaving process, so that the fabric is not easy to wrinkle, shrink, and pilling, thereby improving the elasticity and quick-drying properties of the fabric. The introduction of mineral masterbatch into the cool fiber can improve the thermal conductivity and cooling durability of the fabric. After the mineral masterbatch is introduced into the cool fiber, since the mineral itself has a high thermal conductivity coefficient, tiny heat conduction channels can be formed inside the fiber. In addition, the mineral masterbatch plays a stable physical structural support role in the cool fiber, which can maintain the structural integrity of the fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the assembly structure of the composite fabric and the blackout cloth of the present invention; Figure 3 This is a diagram showing the composition of the composite fabric of the present invention; Figure 4 It is a schematic diagram of the planar assembly structure of the composite fabric and the blackout cloth of the present invention.

[0020] In the figure: 1. Longitudinal fiber layer; 2. Waterproof layer; 3. Combed cotton; 4. Cool fiber; 5. Photochromic fiber layer; 6. Polyester cloth; 7. Female buckle; 8. Male buckle; 9. Blackout cloth. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1 and Figure 3 An embodiment of the present invention is: a high-performance photochromic composite fabric, the high-performance photochromic composite fabric is composed of a longitudinal fiber layer 1, a waterproof layer 2, combed cotton 3, a cool fiber 4 and a photochromic fiber layer 5, the longitudinal fiber layer 1 is interwoven with nylon and spandex, the top of the longitudinal fiber layer 1 is sprayed with a waterproof layer 2, the top of the waterproof layer 2 is hot-pressed and connected with the photochromic fiber layer 5, the bottom of the longitudinal fiber layer 1 is knitted and connected with the combed cotton 3, the bottom of the combed cotton 3 is knitted and connected with the cool fiber 4, the surface of the photochromic fiber layer 5 is coated with an ultraviolet absorber, and the interweaving ratio of nylon and spandex is 1:0.15.

[0024] Furthermore, nylon has high strength and wear resistance, which can make the fabric as a whole stronger and more durable, and not easy to be damaged in daily use. Spandex has excellent elasticity. After being interwoven with nylon, it gives the longitudinal fiber layer 1 good elastic recovery ability, so that it can quickly return to its original shape after being stretched, greatly improving the wearing comfort. The waterproof layer 2 is attached to the longitudinal fiber layer 1 by top spraying to form a continuous waterproof barrier. The combed cotton 3 is connected to the longitudinal fiber layer 1 by knitting. The knitting process makes the two tightly connected and have a certain degree of elasticity. While ensuring a firm connection, it will not affect the overall elasticity and comfort of the fabric, and the function of rapid heat conduction is achieved through the cool fiber 4. The photosensitive color-changing fiber layer 5 is connected to the waterproof layer 2 by hot pressing. Hot pressing can make the two layers fit tightly to form a stable composite structure, ensuring that they will not easily delaminate during use, and the surface is coated with an ultraviolet absorber, which can effectively protect the photosensitive color-changing fiber from excessive damage by ultraviolet rays, maintain the stability and durability of its color-changing performance, and enable the fabric to still accurately change color after multiple light changes.

[0025] See also Figure 2 and Figure 4 An embodiment of the present invention is: a high-performance photosensitive color-changing composite fabric, wherein polyester cloth 6 is knitted and connected on both sides of the composite fabric, a female buckle 7 is connected to the bottom of the polyester cloth 6, a male buckle 8 is engaged with the bottom of the female buckle 7, and a shading cloth 9 is connected to the top of the male buckle 8. When the male buckle 8 is engaged with the female buckle 7, the surface of the polyester cloth 6 is flush with the surface of the shading cloth 9 and the thickness is consistent.

[0026] Furthermore, when it is necessary to increase the light-shielding property of the fabric, the blackout cloth 9 is attached to the bottom of the composite fabric, and then the polyester cloth 6 is pressed downward in an arc shape so that the female buckle 7 on the polyester cloth 6 can be aligned with the male buckle 8 at the bottom of the blackout cloth 9, and then the blackout cloth 9 is fixed to the composite fabric by engaging the female buckle 7 and the male buckle 8, thereby improving the light-shielding property of the fabric.

[0027] See also Figure 3 and Figure 4 The present invention provides an embodiment: a high-performance photosensitive color-changing composite fabric preparation process, the high-performance photosensitive color-changing composite fabric preparation process is as follows: S1. Raw material preparation; S2, first prepare a photochromic slurry, add it to a spinning solution, then weave it into silk, then mix it with synthetic fibers and send it into a loom for spinning to obtain a photochromic fiber layer 5, and coat a layer of ultraviolet absorber on the surface of the photochromic fiber layer 5, the synthetic fibers include polyester and nylon; S3, preparing a longitudinal fiber layer 1 by interweaving nylon and spandex, and preparing combed cotton 3 and cool fiber 4; In S3, the combed cotton 3 is knitted together with elastic polyester fiber and cotton fiber by double-sided weaving process, and the cooling fiber 4 is introduced into the mineral masterbatch by using polyester or nylon as carrier.

[0028] S4, preparing the waterproof layer 2, spraying polyurethane on the top surface of the longitudinal fiber layer 1, and then drying and curing to form a waterproof film, that is, obtaining the waterproof layer 2; S5, pressing the waterproof layer 2 between the longitudinal fiber layer 1 and the photochromic fiber layer 5 by hot pressing to obtain a partial composite fabric; S6, knitting the part of the composite fabric obtained in S5 with the prepared combed cotton 3 and the cool fiber 4 in sequence to form a complete composite fabric; S7, then knit a polyester cloth 6 on the outer surface of the composite fabric, and sew a female buckle 7 on the bottom of the polyester cloth 6. When the prepared photochromic composite material is used to produce curtains or car seat fabrics, the blackout cloth 9 can be fixed on the composite fabric by the engagement of the male buckle 8 and the female buckle 7.

[0029] Furthermore, the silk spun from the photochromic dye is mixed with synthetic fibers such as polyester and nylon and then fed into a loom for spinning. Through this mixing, the advantages of different fibers, such as the strength and stiffness of synthetic fibers, can be comprehensively utilized to improve the overall mechanical properties and stability of the photochromic fiber layer 5, while ensuring that it still retains the core function of photochromic. A layer of ultraviolet absorber is coated on the surface of the photochromic fiber layer 5, which can effectively protect the photochromic fiber from excessive damage by ultraviolet rays. By absorbing ultraviolet rays and converting them into low-energy forms for release, the stability and durability of the color-changing performance of the photochromic fiber layer 5 during subsequent use are maintained, so that the fabric can accurately and durably achieve the color-changing effect under different lighting environments. The longitudinal fiber layer 1 is prepared by interweaving nylon and spandex. The longitudinal fiber layer 1 meets the expected strength, elasticity and other performance requirements through interweaving nylon and spandex, providing good basic support and elastic recovery ability for the entire composite fabric. Then, polyurethane is sprayed on the top surface of the longitudinal fiber layer 1 to prepare the waterproof layer 2. The spraying of polyurethane must ensure uniformity to avoid local excessive thickness or If the fabric is too thin, it will affect the waterproof effect. After drying and curing, the two key post-processing steps, polyurethane can form a continuous, dense and firm waterproof film on the surface of the longitudinal fiber layer, thereby giving the fabric reliable waterproof performance and blocking the infiltration of external moisture. The waterproof layer 2 is pressed between the longitudinal fiber layer 1 and the photochromic fiber layer 5 by hot pressing to ensure that the waterproof layer 2 can fit tightly with the upper and lower layers of fibers to form a stable composite structure to avoid problems such as stratification and degumming during subsequent use. In this way, a partial composite fabric is obtained. The prepared partial composite fabric is then knitted together with the combed cotton 3 and the cool fiber 4 in turn, and a polyester cloth 6 is knitted on the outer surface of the composite fabric, and a female buckle 7 is sewn on the bottom of the polyester cloth 6. Through the engagement of the male buckle 8 and the female buckle 7, when the composite fabric is used to produce curtains or car seat fabrics, the blackout cloth 9 can be conveniently fixed on the composite fabric. This design increases the functionality and flexibility of the product, and is convenient for meeting the adjustment of the blackout requirements of different users and improving the overall aesthetics of the fabric.

[0030] An embodiment provided by the present invention is a process for preparing a high-performance photochromic composite fabric. In S2, the preparation method of the photochromic slurry is as follows: S2-1. Prepare a thickener, a binder, cellulose, photochromic dye capsule powder and water; S2-2. Mix the materials prepared in S2-1 in a mass ratio of 1:2:1.5:2:4.5 to form a photosensitive color-changing slurry.

[0031] The photochromic dye capsule powder adopts microcapsule technology to encapsulate the photochromic dye in capsules to obtain microcapsules, and the microcapsules are filtered, washed and dried to obtain the photochromic dye capsule powder. The thickener is sodium alginate, the adhesive is polyurethane adhesive, and the cellulose is cotton cellulose.

[0032] Furthermore, the use of microcapsule technology to encapsulate the photochromic dye can effectively protect the dye molecules and isolate the dye from some factors in the external environment that may cause it to deteriorate, such as oxygen, moisture, and other chemicals. For example, during storage, the dye is prevented from losing its color-changing function due to oxidation reactions, thereby improving the stability of the photochromic dye and extending its service life. At the same time, the microcapsule can also fix the dye in a certain position to ensure the uniformity and repeatability of the color change. Then, sodium alginate, polyurethane adhesive, cotton cellulose, photochromic dye capsule powder and water are mixed together in a certain mass ratio to prepare a photochromic slurry, which is added to the spinning solution and then spun into silk.

[0033] When mixing photochromic dye capsule powder, cellulose, etc., sodium alginate can make them evenly suspended in the solution, ensuring the uniformity of the various components of the fabric. The polyurethane adhesive can firmly bond different fiber materials together. When the fabric is subjected to external forces such as stretching and friction, it can prevent peeling between fibers and ensure the structural integrity of the fabric. At the same time, the polyurethane molecular chain contains flexible segments, which makes the adhesive itself have good flexibility and elasticity, so that the adhesive can deform without breaking during the deformation of the fabric such as bending and stretching, thereby maintaining the overall performance of the fabric.

[0034] The photochromic performance is evaluated as follows: UV transmittance (%): In the 280-400mm band, the transmittance of the composite fabric is 0.18%-0.39%.

[0035] Composite fabric absorbance: According to GB / T18830-2009 standard, the UV transmittance of the composite fabric is measured using a textile anti-UV performance tester. The absorbance curve of the UV absorber has an obvious absorption band in the 200-400nm band, and has strong absorption peaks near the 220nm and 293nm UV bands.

[0036] The color difference (photochromicity) of the composite fabric is ≤3, and the Q-max value of the composite fabric is 0.29; Composite fabric resistance to simulated sunlight test: The composite fabric was placed under a 300W xenon lamp to simulate the composite fabric's resistance to simulated sunlight fatigue test during daily use. After 6 hours of continuous irradiation with the xenon lamp, the composite fabric had almost the same change as when it was first exposed to sunlight, indicating that the composite fabric had good fatigue resistance under simulated sunlight.

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-performance photosensitive color-changing composite fabric, characterized in that: The high-performance photochromic composite fabric is composed of a longitudinal fiber layer (1), a waterproof layer (2), combed cotton (3), cool fibers (4) and a photochromic fiber layer (5); The longitudinal fiber layer (1) is interwoven with nylon and spandex, a waterproof layer (2) is sprayed on the top of the longitudinal fiber layer (1), a photosensitive color-changing fiber layer (5) is hot-pressedly connected to the top of the waterproof layer (2), a combed cotton (3) is knitted and connected to the bottom of the longitudinal fiber layer (1), and a cool fiber (4) is knitted and connected to the bottom of the combed cotton (3); The surface of the photochromic fiber layer (5) is coated with an ultraviolet absorber.

2. The high-performance photosensitive color-changing composite fabric according to claim 1, characterized in that: The surfaces of both sides of the composite fabric are knitted with polyester cloth (6), the bottom of the polyester cloth (6) is connected with a female buckle (7), the bottom of the female buckle (7) is engaged with a male buckle (8), and the top of the male buckle (8) is connected with a blackout cloth (9). When the male buckle (8) is engaged with the female buckle (7), the surface of the polyester cloth (6) is flush with the surface of the blackout cloth (9) and has the same thickness.

3. The high-performance photochromic composite fabric according to claim 1, characterized in that: The interweaving ratio of nylon and spandex is 1:0.

15.

4. A process for preparing a high-performance photochromic composite fabric, used for preparing a high-performance photochromic composite fabric according to any one of claims 1 to 3, characterized in that: The preparation process of high-performance photosensitive color-changing composite fabric is as follows: S1. Raw material preparation; S2, first preparing a photochromic slurry, adding it to a spinning solution, then spinning it into silk, then mixing it with synthetic fibers and sending it into a loom for spinning to obtain a photochromic fiber layer (5), and coating the surface of the photochromic fiber layer (5) with a layer of ultraviolet absorber; S3, preparing a longitudinal fiber layer (1) by interweaving nylon and spandex, and preparing combed cotton (3) and cool fiber (4); S4, preparing a waterproof layer (2), spraying polyurethane on the top surface of the longitudinal fiber layer (1), and then drying and curing to form a waterproof film, thereby obtaining a waterproof layer (2); S5, pressing the waterproof layer (2) between the longitudinal fiber layer (1) and the photochromic fiber layer (5) by hot pressing to obtain a partial composite fabric; S6, then knitting the part of the composite fabric obtained in S5 with the prepared combed cotton (3) and the cool fiber (4) in sequence to form a complete composite fabric; S7, a polyester cloth (6) is then knitted onto the outer surface of the composite fabric, and a female buckle (7) is sewn onto the bottom of the polyester cloth (6). When the prepared photochromic composite material is used to produce curtains or car seat fabrics, the blackout cloth (9) can be fixed to the composite fabric by engaging the male buckle (8) and the female buckle (7).

5. A process for preparing a high-performance photosensitive color-changing composite fabric according to claim 4, characterized in that: The synthetic fibers include polyester and nylon.

6. A process for preparing a high-performance photosensitive color-changing composite fabric according to claim 4, characterized in that: In S2, the photosensitive color-changing paste is prepared as follows: S2-1. Prepare a thickener, a binder, cellulose, photochromic dye capsule powder and water; S2-2. Mix the materials prepared in S2-1 in a mass ratio of 1:2:1.5:2:4.5 to form a photosensitive color-changing slurry.

7. A process for preparing a high-performance photosensitive color-changing composite fabric according to claim 6, characterized in that: The photochromic dye capsule powder adopts microcapsule technology to encapsulate the photochromic dye in capsules to obtain microcapsules, and the microcapsules are filtered, washed and dried to obtain the photochromic dye capsule powder.

8. The process for preparing a high-performance photosensitive color-changing composite fabric according to claim 4, characterized in that: In S3, the combed cotton (3) is knitted together with elastic polyester fiber and cotton fiber using a double-sided weaving process.

9. A process for preparing a high-performance photosensitive color-changing composite fabric according to claim 4, characterized in that: The cooling fiber (4) is introduced with mineral masterbatch using polyester or nylon as a carrier.

10. The process for preparing a high-performance photosensitive color-changing composite fabric according to claim 6, characterized in that: The thickener is sodium alginate, the adhesive is polyurethane adhesive, and the cellulose is cotton cellulose.

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