After-finishing process of multifunctional natural fiber interwoven composite fabric

Abstract

The invention relates to the field of textile fabrics and functional nano materials, in particular to an after-finishing process for a multifunctional natural fiber interwoven composite fabric. The after-finishing process comprises the following steps: (1) phytic acid flame-retardant finishing; (2) carrying out Fe3O4 (at) ZIF-8 finishing; (3) growing a NiAl-LDH layer in situ; and (4) carrying out PDMS (Polydimethylsiloxane) super-hydrophobic finishing. According to the after-finishing process, directional arrangement of particles is induced through a magnetic field, the binding strength is greatly improved, the LDH layer plays a role in physical blocking and endothermic decomposition, the fabric is endowed with excellent functions of flame retardance, magnetism, antibiosis, ultraviolet resistance, super-hydrophobicity, washing resistance and the like, and the application scene and value of the fabric are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric and functional nanomaterial technology, specifically relating to a finishing process for a multifunctional natural fiber interwoven composite fabric. Background Technology

[0002] Finishing is a technical process that imparts color effects, shape effects (smoothness, nap, crispness, etc.) and practical effects (waterproof, non-felt, wrinkle-free, mothproof, flame-retardant, etc.) to fabrics. Fabric finishing is a process that improves the appearance and feel of fabrics, enhances their performance, or endows them with special functions through chemical or physical methods. In essence, fabric finishing uses coatings or other technologies to add functions to textiles, such as shape stability, improved feel, improved appearance, and increased functionality. The aim is to improve the comfort, cleanliness, safety, and medical effects of textiles.

[0003] Fabric finishing can endow textiles with certain protective properties or other special functions, such as flame retardancy, antibacterial properties, water repellency, oil repellency, UV protection, and antistatic properties. Currently, multifunctional composite finishing is driving the development of textile products towards deeper and higher-end levels. It not only overcomes the inherent shortcomings of textiles but also endows them with multifunctionality. Multifunctional composite finishing is a technology that combines two or more functions into one textile to improve the product's grade and added value. However, multifunctional composite finishing still has shortcomings, such as weakening or loss of effectiveness after prolonged use or repeated washing. Summary of the Invention

[0004] The purpose of this invention is to provide a finishing process for multifunctional natural fiber interwoven composite fabrics to solve the technical problems in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a finishing process for multifunctional natural fiber interwoven composite fabrics, comprising the following steps:

[0007] Step (1) Phytic acid flame retardant finishing; Step (2) Fe3O4@ZIF-8 finishing; Step (3) In-situ growth of NiAl-LDH layer; Step (4) PDMS superhydrophobic finishing, to obtain multifunctional natural fiber interwoven composite fabric.

[0008] Preferably, the method of phytic acid flame retardant finishing in step (1) is as follows: phytic acid and penetrant are mixed, and citric acid is used to adjust the pH to obtain finishing solution A; the interwoven fabric is dipped and rubbed twice in finishing solution A, washed, pre-dried, and baked to obtain phytic acid finished interwoven fabric.

[0009] Preferably, the phytic acid concentration is 8-10% (owf); the penetrant is penetrant JFC with a concentration of 0.5 g / L; the pH value is adjusted to 5.5-6.0; the slurry yield of the two dips and two tumblers is 70-80%; the washing conditions are: washing temperature of 40℃ and washing time of 5 min; the pre-drying conditions are: pre-drying temperature of 100℃ and pre-drying time of 90 s; the baking conditions are: baking temperature of 150℃ and baking time of 120 s.

[0010] Preferably, the method for finishing Fe3O4@ZIF-8 in step (2) is as follows: Fe3O4@ZIF-8 is dispersed in an ethanol aqueous solution, and then ammonium polyacrylate is added to obtain a Fe3O4@ZIF-8 mixture. The phytic acid-finished interwoven fabric is placed in the NdFeB N52 grade permanent magnet array area for 3 seconds. Then, the Fe3O4@ZIF-8 mixture is sprayed onto the surface of the interwoven fabric and cured to obtain the Fe3O4@ZIF-8 finished interwoven fabric.

[0011] In the above process, when the magnetic field strength is 0.5T, the magnetic torque overcomes the Brownian motion energy, achieving a particle orientation degree of >90%. Magnetic particles are adsorbed to the depressions on the fiber surface, increasing mechanical locking and significantly improving binding energy and shear resistance.

[0012] Preferably, the concentration of Fe3O4@ZIF-8 is 8-12% (w / v); the volume ratio of ethanol to water in the ethanol-water solution is 1:1; the mass fraction of ammonium polyacrylate is 0.1wt%; the nozzle diameter of the spray gun is 0.3mm, the spraying air pressure is 0.3MPa, and the liquid coverage is controlled at 40-50%; the curing conditions are: curing temperature of 80℃, curing time of 10min; the magnetic field strength of the array area is 0.45-0.55T, the magnetic pole spacing is 50mm, and the angle between the magnetic lines of force and the fiber axis is ≤15°.

[0013] Preferably, the preparation method of Fe3O4@ZIF-8 includes the following steps:

[0014] Fe3O4 was dispersed in methanol, sonicated, and then 2-methylimidazole was added and stirred to dissolve to obtain a dispersion. Zn(NO3)2·6H2O was dissolved in methanol and added dropwise to the dispersion. The mixture was allowed to stand for reaction, separated by magnetic field, washed, and dried under vacuum to obtain Fe3O4@ZIF-8.

[0015] Preferably, the average particle size of Fe3O4 is 20-30 nm; the ratio of Fe3O4, methanol, 2-methylimidazole, Zn(NO3)2·6H2O, and methanol is 1 g:80 mL:5.8-7.2 g:2.8-3.1 g:40 mL; the ultrasonic treatment conditions are: ultrasonic power of 250-350 W, ultrasonic treatment time of 20-40 min; the dropping rate is 0.8-1.2 mL / min; the static reaction conditions are: static reaction temperature of 23-27℃, static reaction time of 10-14 h; the washing method is: washing with methanol 2-4 times; the vacuum drying temperature is 60℃; and the particle size of Fe3O4@ZIF-8 is 80-120 nm.

[0016] Preferably, the method for in-situ growth of NiAl-LDH layer in step (3) is as follows: Fe3O4@ZIF-8 treated interwoven fabric is immersed in a mixed solution composed of Ni(NO3)2·6H2O, Al(NO3)3·9H2O and urea, treated, washed, dried and ultrasonically reinforced to obtain in-situ grown NiAl-LDH sheet interwoven fabric.

[0017] Preferably, in the mixed solution, Ni 2+ With Al 3+ The molar ratio is 2:1 to 3:1, and the molar ratio of urea is Ni. 2+ Add Al 3+ The molar ratio is 3 times that of the total; the immersion bath ratio is 1:30; the treatment conditions are: treatment temperature of 79-81℃ and treatment time of 5.5-6.5h; the washing method is: cold water 3-5 times; the drying temperature is 60℃; the ultrasonic strengthening method is: ultrasonic strengthening at 40kHz and 100W for 5min; the thickness of the NiAl-LDH sheet is 30-40nm and the interlayer spacing is 0.76-0.78nm.

[0018] In the above process, the NiAl-LDH sheets are two-dimensional sheet structures arranged parallel to the fiber surface.

[0019] Preferably, the method for PDMS superhydrophobic finishing in step (4) is as follows: dilute silicone oil (PDMS) with heptane solvent, atomize and spray, perform one drying, two drying, and three drying to obtain a multifunctional natural fiber interwoven composite fabric.

[0020] Preferably, the PDMS concentration after dilution is 6-10 g / L; the liquid carry-over rate is controlled at 40-45% by atomization spraying; the first drying method is to dry at 80℃ for 5 min; the second drying method is to dry at 120℃ for 5 min; and the third drying method is to dry at 125℃ for 3 min.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The finishing process in this invention improves the flame retardancy of the composite fabric through the synergistic effect of the LDH layer and phytic acid; the pyrolysis of phytic acid generates polyphosphoric acid, which catalyzes dehydration and carbonization; during the combustion of the NiAl-LDH sheets, a "maze effect" is formed, and the LDH layer undergoes high-temperature endothermic decomposition, extending the heat / oxygen diffusion path, and the Al of the LDH layer... 3+ It reacts with phosphate ions of phytic acid to form a thermally stable AlPO4 ceramic layer that isolates oxygen, and forms a NiO / Al2O3 framework in the residual carbon, increasing the degree of graphitization of the carbon layer.

[0023] 2. The finishing process in this invention forms a stable biomimetic papillary structure through the orderly arrangement of magnetron particles. PDMS and magnetron synergistically endow the interwoven fabric with superhydrophobicity. The interwoven fabric has built-in magnetic tags, which can quickly locate trapped personnel in extreme environments or load MXene or TiO2 on the LDH layer to trigger the fabric's self-heating function through the magnetic field, absorbing light energy and converting it into heat energy to maintain body temperature. In the future, it is expected to play a role in intelligent response and safety protection in extreme environments.

[0024] 3. In this invention, a post-finishing process enables metal ions to synergistically impart antibacterial properties to the interwoven fabric. Zn released by ZIF-8... 2+ Damage to cell membranes, Ni in LDH lamina 2+ Catalytic activity is generated; and the LDH layer reflects UV and the PDMS total reflection interface endows the interwoven fabric with UV protection properties. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of the finishing process for the multifunctional natural fiber interwoven composite fabric of the present invention.

[0027] Figure 2 This is a schematic diagram illustrating the flame-retardant properties of the multifunctional natural fiber interwoven composite fabric of the present invention.

[0028] Figure 3 This is a schematic diagram illustrating the antibacterial properties of the multifunctional natural fiber interwoven composite fabric of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the UV protection performance of the multifunctional natural fiber interwoven composite fabric of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] See Figure 1 As shown, this embodiment discloses a finishing process for a multifunctional natural fiber interwoven composite fabric, including the following steps:

[0033] 1 g of Fe3O4 with an average particle size of 20 nm was dispersed in 80 mL of methanol and sonicated at 250 W for 20 min. Then, 5.8 g of 2-methylimidazole was added and stirred to dissolve. 2.8 g of Zn(NO3)2·6H2O was dissolved in 40 mL of methanol and then added dropwise at a rate of 0.8 mL / min. The reaction was allowed to stand at 23 °C for 10 h. The mixture was separated by magnetic field, washed twice with methanol, and dried under vacuum at 60 °C to obtain Fe3O4@ZIF-8.

[0034] Step (1) Mix 8% (owf) phytic acid and 0.5 g / L penetrant JFC, adjust the pH to 5.5 with citric acid to obtain finishing solution A; dip and rub the interwoven fabric twice in finishing solution A, control the rub rate to 70%, wash with warm water at 40℃ for 5 min to remove free acid, then pre-dry at 100℃ for 90 s, and finally bake at 150℃ for 120 s to obtain phytic acid finished interwoven fabric;

[0035] Step (2) Disperse 8% (w / v) Fe3O4@ZIF-8 in an ethanol-water solution with a volume ratio of 1:1, add 0.1wt% ammonium polyacrylate to obtain Fe3O4@ZIF-8 mixture, place the phytic acid-treated interwoven fabric in the N52 grade permanent magnet array area for 3s, the magnetic field strength is 0.45T, the magnetic pole spacing is 50mm, and the angle between the magnetic lines of force and the fiber axis is 0°; then spray the Fe3O4@ZIF-8 mixture onto the surface of the interwoven fabric, the spray gun nozzle diameter is 0.3mm, the air pressure is 0.3MPa, the liquid rate is controlled at 40%, and it is cured at 80℃ for 10min to obtain Fe3O4@ZIF-8 treated interwoven fabric;

[0036] Step (3) involves immersing the Fe3O4@ZIF-8 treated interwoven fabric in a mixed solution composed of Ni(NO3)2·6H2O, Al(NO3)3·9H2O, and urea. 2+ With Al 3+ The molar ratio is 2:1, and the molar ratio of urea is Ni. 2+ Add Al3+ The molar ratio is 3 times that of the liquid, the liquor ratio is 1:30, and then it is treated at 79℃ for 5.5h. After being washed with cold water, it is dried at 60℃ and finally ultrasonically reinforced at 40kHz and 100W for 5min to obtain in-situ grown NiAl-LDH sheet interwoven fabric.

[0037] Step (4) Dilute PDMS to 6 g / L using heptane solvent, atomize and spray, control the liquid rate to 40%, dry at 80℃ for 5 min, then dry at 120℃ for 5 min, and finally dry at 125℃ for 3 min to obtain a multifunctional natural fiber interwoven composite fabric.

[0038] Example 2

[0039] See Figure 1 As shown, this embodiment discloses a finishing process for a multifunctional natural fiber interwoven composite fabric, including the following steps:

[0040] 1 g of Fe3O4 with an average particle size of 25 nm was dispersed in 80 mL of methanol and sonicated at 300 W for 30 min. Then, 6.5 g of 2-methylimidazole was added and stirred to dissolve. 3.0 g of Zn(NO3)2·6H2O was dissolved in 40 mL of methanol and then added dropwise at a rate of 1 mL / min. The reaction was allowed to stand at 25 °C for 12 h. The mixture was separated by magnetic field, washed three times with methanol, and dried under vacuum at 60 °C to obtain Fe3O4@ZIF-8.

[0041] Step (1) Mix 9% (owf) phytic acid and 0.5 g / L penetrant JFC, adjust the pH to 5.8 with citric acid to obtain finishing solution A; dip and rub the interwoven fabric twice in finishing solution A, control the rub rate to 75%, wash with warm water at 40℃ for 5 min to remove free acid, then pre-dry at 100℃ for 90 s, and finally bake at 150℃ for 120 s to obtain phytic acid finished interwoven fabric;

[0042] Step (2) Disperse 10% (w / v) Fe3O4@ZIF-8 in an ethanol-water solution with a volume ratio of 1:1, add 0.1wt% ammonium polyacrylate to obtain Fe3O4@ZIF-8 mixture, place the phytic acid-treated interwoven fabric in the N52 grade permanent magnet array area for 3s, the magnetic field strength is 0.5T, the magnetic pole spacing is 50mm, and the angle between the magnetic lines of force and the fiber axis is 8°, then spray the Fe3O4@ZIF-8 mixture onto the surface of the interwoven fabric, the spray gun nozzle diameter is 0.3mm, the air pressure is 0.3MPa, the liquid rate is controlled at 45%, and it is cured at 80℃ for 10min to obtain Fe3O4@ZIF-8 treated interwoven fabric;

[0043] Step (3) The Fe3O4@ZIF-8 treated interwoven fabric is immersed in a mixed solution composed of Ni(NO3)2·6H2O, Al(NO3)3·9H2O, and urea. 2+ With Al 3+ The molar ratio is 3:1, and the molar ratio of urea is Ni. 2+ Add Al 3+ The molar ratio is 3 times that of the liquor ratio, the bath ratio is 1:30, the treatment is carried out at 80℃ for 6 hours, the product is washed with cold water and dried at 60℃, and finally ultrasonically reinforced at 40kHz and 100W for 5 minutes to obtain the in-situ grown NiAl-LDH sheet interwoven fabric.

[0044] Step (4) Dilute PDMS to 8 g / L using heptane solvent, atomize and spray, control the liquid carry-over rate to 42%, dry at 80℃ for 5 min, then dry at 120℃ for 5 min, and finally dry at 125℃ for 3 min to obtain a multifunctional natural fiber interwoven composite fabric.

[0045] Example 3

[0046] See Figure 1 As shown, this embodiment discloses a finishing process for a multifunctional natural fiber interwoven composite fabric, including the following steps:

[0047] 1 g of Fe3O4 with an average particle size of 30 nm was dispersed in 80 mL of methanol and sonicated at 350 W for 40 min. Then, 7.2 g of 2-methylimidazole was added and stirred to dissolve. 3.1 g of Zn(NO3)2·6H2O was dissolved in 40 mL of methanol and then added dropwise at a rate of 1.2 mL / min. The reaction was allowed to stand at 27 °C for 14 h. The mixture was separated by magnetic field, washed 4 times with methanol, and dried under vacuum at 60 °C to obtain Fe3O4@ZIF-8.

[0048] Step (1) Mix 10% (owf) phytic acid and 0.5 g / L penetrant JFC, adjust the pH to 6 with citric acid to obtain finishing solution A; dip and rub the interwoven fabric twice in finishing solution A, control the rub rate to 80%, wash with warm water at 40℃ for 5 min to remove free acid, then pre-dry at 100℃ for 90 s, and finally bake at 150℃ for 120 s to obtain multifunctional natural fiber interwoven composite fabric.

[0049] Step (2) Disperse 12% (w / v) Fe3O4@ZIF-8 in an ethanol-water solution with a volume ratio of 1:1. Then add 0.1wt% ammonium polyacrylate to obtain a Fe3O4@ZIF-8 mixture. Place the phytic acid-treated interwoven fabric in a N52 grade permanent magnet array area for 3s with a magnetic field strength of 0.55T, a magnetic pole spacing of 50mm, and an angle of 15° between the magnetic lines of force and the fiber axis. Spray the Fe3O4@ZIF-8 mixture onto the surface of the interwoven fabric with a spray gun nozzle diameter of 0.3mm, an air pressure of 0.3MPa, and control the liquid coverage rate at 40-50%. Cure at 80℃ for 10min to obtain the Fe3O4@ZIF-8 treated interwoven fabric.

[0050] Step (3) The Fe3O4@ZIF-8 treated interwoven fabric is immersed in a mixed solution composed of Ni(NO3)2·6H2O, Al(NO3)3·9H2O, and urea. 2+ With Al 3+ The molar ratio is 3:1, and the molar ratio of urea is Ni. 2+ Add Al 3+ The molar ratio is 3 times that of the liquor ratio, the liquor ratio is 1:30, the treatment is carried out at 81℃ for 6.5h, the product is washed with cold water and dried at 60℃, and finally ultrasonically reinforced at 40kHz and 100W for 5min to obtain in-situ grown NiAl-LDH sheet interwoven fabric.

[0051] Step (4) Dilute PDMS to 10 g / L using heptane solvent, atomize and spray, control the liquid content to 45%, dry at 80℃ for 5 min, then dry at 120℃ for 5 min, and finally dry at 125℃ for 3 min to obtain a multifunctional natural fiber interwoven composite fabric.

[0052] Comparative Example 1

[0053] Comparative Example 1 is an unprocessed interwoven fabric.

[0054] Comparative Example 2

[0055] Compared with the post-processing process of Example 2, Comparative Example 2 only omits the magnetic field treatment step.

[0056] Experimental Example

[0057] The properties of the fabrics from Examples 1-3 and Comparative Examples 1-2 were tested, and the test results are shown in Tables 1 and 2:

[0058] Table 1. Performance comparison of unfinished fabric and fabrics from Examples 1-3

[0059]

[0060] Table 2 Comparison of performance of interwoven fabrics with and without magnetic field treatment.

[0061]

[0062]

[0063] Based on Tables 1 and 2, and from Examples 1-3 and Comparative Examples 1-2, the multifunctional natural fiber interwoven composite fabric prepared by the present invention through post-processing exhibits excellent flame retardant, waterproof, antibacterial, magnetic response, washability, and UV protection properties. Comparative Example 2 shows that without a magnetic field, particle shedding resulted in a particle shedding rate as high as 42% after 50 washes, with an LOI retention rate of only 75%. The shed particles disrupted the continuity of the PDMS film, causing the WCA to drop from 151° to 132°, resulting in the loss of superhydrophobicity. This is because without magnetic field treatment, randomly distributed particles are bound only by van der Waals forces, and the shear force of the water flow during washing can easily detach the particles. After 50 washes, the fabric surface showed obvious pits and marks from particle shearing, while the surface of the magnetically treated area remained intact.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0065] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A finishing process for a multifunctional natural fiber interwoven composite fabric, characterized in that, The finishing process includes the following steps: step (1) phytic acid flame retardant finishing; step (2) Fe3O4@ZIF-8 finishing; step (3) in-situ growth of NiAl-LDH layer; step (4) PDMS superhydrophobic finishing to obtain a multifunctional natural fiber interwoven composite fabric.

2. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 1, characterized in that, The method of phytic acid flame retardant finishing in step (1) is as follows: phytic acid and penetrant are mixed, and citric acid is used to adjust the pH to obtain finishing solution A; the interwoven fabric is dipped and rubbed twice in finishing solution A, washed, pre-dried, and baked to obtain phytic acid finished interwoven fabric.

3. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 2, characterized in that, The phytic acid concentration is 8-10% (owf); the penetrant is penetrant JFC with a concentration of 0.5 g / L; the pH value is adjusted to 5.5-6.0; the slurry yield of the two dips and two tumblers is 70-80%; the washing conditions are: washing temperature 40℃ and washing time 5 min; the pre-drying conditions are: pre-drying temperature 100℃ and pre-drying time 90 s; the baking conditions are: baking temperature 150℃ and baking time 120 s.

4. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 1, characterized in that, The method for Fe3O4@ZIF-8 finishing in step (2) is as follows: Fe3O4@ZIF-8 is dispersed in an ethanol aqueous solution, and then ammonium polyacrylate is added to obtain a Fe3O4@ZIF-8 mixture. The phytic acid-finished interwoven fabric is placed in the NdFeB N52 grade permanent magnet array area for 3 seconds. Then, the Fe3O4@ZIF-8 mixture is sprayed onto the surface of the interwoven fabric and cured to obtain the Fe3O4@ZIF-8 finished interwoven fabric.

5. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 4, characterized in that, The concentration of Fe3O4@ZIF-8 is 8-12% (w / v); the volume ratio of ethanol to water in the ethanol-water solution is 1:1; the mass fraction of ammonium polyacrylate is 0.1wt%; the nozzle diameter of the spray gun is 0.3mm, the spraying air pressure is 0.3MPa, and the liquid coverage is controlled at 40-50%; the curing conditions are: curing temperature is 80℃, curing time is 10min; the magnetic field strength of the array area is 0.45-0.55T, the magnetic pole spacing is 50mm, and the angle between the magnetic lines of force and the fiber axis is ≤15°.

6. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 4, characterized in that, The preparation method of Fe3O4@ZIF-8 includes the following steps: Fe3O4 was dispersed in methanol, sonicated, and then 2-methylimidazole was added and stirred to dissolve to obtain a dispersion. Zn(NO3)2·6H2O was dissolved in methanol and added dropwise to the dispersion. The mixture was allowed to stand for reaction, separated by magnetic field, washed, and dried under vacuum to obtain Fe3O4@ZIF-8.

7. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 6, characterized in that, The average particle size of Fe3O4 is 20-30 nm; the ratio of Fe3O4, methanol, 2-methylimidazole, Zn(NO3)2·6H2O, and methanol is 1 g:80 mL:5.8-7.2 g:2.8-3.1 g:40 mL; ultrasonic treatment conditions: ultrasonic power of 250-350 W, ultrasonic treatment time of 20-40 min; dropping rate of 0.8-1.2 mL / min; static reaction conditions: static reaction temperature of 23-27℃, static reaction time of 10-14 h; washing method: washing with methanol 2-4 times; vacuum drying temperature of 60℃; the particle size of Fe3O4@ZIF-8 is 80-120 nm.

8. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 1, characterized in that, The method for in-situ growth of NiAl-LDH layer in step (3) is as follows: Fe3O4@ZIF-8 treated interwoven fabric is immersed in a mixed solution composed of Ni(NO3)2·6H2O, Al(NO3)3·9H2O and urea, treated, washed, dried and ultrasonically reinforced to obtain in-situ grown NiAl-LDH sheet interwoven fabric.

9. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 8, characterized in that, In the mixed solution, Ni 2+ With Al 3+ The molar ratio is 2:1 to 3:1, and the molar ratio of urea is Ni. 2+ Add Al 3+ The molar ratio is 3 times that of the total; the immersion bath ratio is 1:30; the treatment conditions are: treatment temperature of 79-81℃ and treatment time of 5.5-6.5h; the washing method is: cold water 3-5 times; the drying temperature is 60℃; the ultrasonic strengthening method is: ultrasonic strengthening at 40kHz and 100W for 5min; the thickness of the NiAl-LDH sheet is 30-40nm and the interlayer spacing is 0.76-0.78nm.

10. The finishing process for the multifunctional natural fiber interwoven composite fabric according to claim 1, characterized in that, The method for PDMS superhydrophobic finishing in step (4) is as follows: dilute silicone oil (PDMS) with heptane solvent, atomize and spray, and perform one drying, two drying, and three drying to obtain a multifunctional natural fiber interwoven composite fabric; the concentration of PDMS after dilution is 6-10 g / L; the liquid carry-over rate is controlled at 40-45% by atomization and spraying; the first drying method is to dry at 80℃ for 5 min; the second drying method is to dry at 120℃ for 5 min; the third drying method is to dry at 125℃ for 3 min.

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