Anion fabric with sound wave excitation vibration and preparation method thereof

Abstract

The invention provides a sound wave excited vibration negative ion fabric, which is characterized in that the negative ion fabric comprises a fabric layer and a composite negative ion release layer, the composite negative ion release layer comprises an electrostatic spinning film and negative ion particles, the electrostatic spinning film is a polyimide electrostatic spinning film, and the negative ion particles are arranged on the surface of the fabric layer. And the negative ion particles are MOF hybrid materials coated with negative ion powder. According to the anion fabric, sound waves can be converted into mechanical vibration under low-frequency sound waves, so that the nanometer anion powder in the fabric is triggered to release anions, and the anion fabric has good anion release capacity especially under the environment of the low-frequency sound waves.

Description

Technical Field

[0001] The invention relates to the field of functional fabrics, and in particular to a negative ion fabric vibrating by sound wave excitation and a preparation method thereof. Background Art

[0002] Negative ion fabric is a new type of functional textile. It is endowed with the ability to release negative ions by incorporating minerals that can release negative ions into the fiber or by using post-finishing technology. Negative ions, i.e. negatively charged oxygen ions, are believed to be beneficial to the human body and can purify the air, improve breathing, promote blood circulation, relieve fatigue, etc. Therefore, negative ion fabrics have received extensive attention in the field of healthy textiles. The researchers have endowed fabrics with the ability to release negative ions by embedding natural minerals (such as tourmaline, germanium, coral fossils, etc.) or synthetic negative ion generating materials into fibers, or fixing these materials on the surface of fabrics through post-finishing processes. When these materials are stimulated by external energy (such as friction, temperature changes, humidity, etc.), they can excite water molecules or oxygen molecules in the air to generate negative ions. With the advancement of science and technology, sound wave energy conversion technology has gradually become a new research hotspot. Sound waves, as a mechanical wave, have the characteristics of energy transfer. When sound waves act on certain materials, they can cause mechanical vibrations of the materials, which can be converted into electrical energy or other forms of energy. In the research of negative ion fabrics, the technology of converting sound waves into mechanical vibrations provides a new idea for the release of negative ions. For example, by combining sound wave energy conversion materials with negative ion generating materials, the release effect of negative ions can be enhanced under the action of sound waves. This interdisciplinary research not only broadens the functionality of negative ion fabrics, but also provides a new direction for the development of smart textiles. In the future, as the sound wave energy conversion technology continues to mature, its application in negative ion fabrics will be more extensive, and it is expected to develop more smart textiles with health-promoting functions. Summary of the invention

[0003] Technical problem to be solved: The purpose of the present invention is to provide a negative ion fabric with sound wave excited vibration, which can convert sound waves into mechanical vibrations under low-frequency sound waves, thereby triggering the nano negative ion powder in the fabric to release negative ions, especially in the environment of low-frequency sound waves, and has good negative ion release ability.

[0004] Technical solution: A negative ion fabric that vibrates with sound waves, the negative ion fabric comprising a fabric layer and a composite negative ion release layer, the composite negative ion release layer comprising an electrospinning membrane and negative ion particles, the electrospinning membrane being a polyimide electrospinning membrane, and the negative ion particles being a MOF hybrid material coated with negative ion powder. In one embodiment, the porosity of the polyimide electrospinning membrane is 40-60%. The present invention also provides a method for preparing a negative ion fabric with acoustic wave excitation vibration, comprising the following steps: S1. Providing polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOFs metal skeleton; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into the syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed, and finally heat-treated to obtain a composite negative ion release layer; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. In one embodiment, the polyimide electrospinning solution in step S1 is prepared by a method comprising the following steps: S11. Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; S12. The transparent solution is placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether is added, and the mixture is stirred to react uniformly to obtain a PAA precursor solution with a concentration of 8-10 wt %, which is the polyimide electrospinning solution. In one embodiment, the electrostatic spray solution containing negative ion powder and MOFs metal skeleton in step S2 is prepared by a method comprising the following steps: S21. Adding the nano-anion powder and the submicron or micron MOFs metal skeleton to water, stirring and dispersing uniformly to obtain a dispersion; S22. The polyvinyl alcohol solution was heated in water and stirred to obtain a polyvinyl alcohol solution; S23. The dispersion and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing negative ion powder and MOFs metal skeleton. In one embodiment, the parameters of electrostatic spinning in step S3 are: spinning injection volume of 0.8-1 mL, injection rate of 0.6-1 mL / h; electrostatic spraying parameters are: spray injection volume of 0.6-1 mL / h, injection rate of 0.5-1 mL / h; the rotating drum speed in the roller electrostatic spinning device is 600-1200 r / min, and the receiving distance is 10-15 cm. In one embodiment, the gradient temperature increase program of the heat treatment in step S3 is to maintain at 100°C, 200°C and 300°C for 1-1.5h, and the heating rates are 2-3°C / min, 2-3°C / min, and 3-5°C / min, respectively. In one embodiment, the mass ratio of the nano-sized negative ion powder to the MOFs metal skeleton in step S21 is 1-2:1. In one embodiment, the concentration of polyvinyl alcohol in the electrostatic spray solution in step S23 is 6-10wt%, and the content of nano anion powder in the electrostatic spray solution is 0.7-1wt%. In one embodiment, the MOFs metal skeleton in step S21 is MOF-5. Beneficial effects: The negative ion fabric of the present invention has the following advantages: 1. In the present invention, a polyimide electrospinning membrane is selected as a medium for converting sound waves into mechanical vibrations, and the MOF hybrid material coated with negative ion powder is anchored on the surface of polyimide nanofibers by combining electrospinning-spraying technology. MOFs and polyimide materials can vibrate under low-frequency sound waves. Therefore, the negative ion release layer prepared in the present invention can convert sound waves into mechanical vibrations under low-frequency sound waves, and load negative ion powder on the surface of MOFs. Through the synergistic effect of nanofibers and MOFs, the conversion efficiency of sound waves is improved, thereby improving the release capacity of negative ions. In addition, when the porosity of the polyimide electrospinning membrane is in the range of 40-60%, it has a good negative ion release effect; 2. The present invention can optimize the amount of negative ions released according to environmental requirements by adjusting the frequency of acoustic vibration, thus realizing intelligent control; compared with traditional mechanical friction or thermal energy excitation methods, low-frequency acoustic wave excitation vibration technology does not require additional energy consumption and does not produce harmful emissions. This green and environmentally friendly technical feature gives the fabric a significant advantage in sustainable development, meeting the current textile industry's requirements for environmental protection and energy saving; 3. The electrospinning membrane in the present invention is prepared by an electrospinning process and has a nanoscale pore structure, which can effectively improve the dispersibility and adhesion of negative ion particles, while the MOF hybrid material combines negative ion powder with MOF material through coating technology, which not only enhances the stability of negative ions, but also improves their uniform distribution ability in the fabric. This combination makes the release of negative ions more uniform and lasting, avoiding the problems of excessive local concentration or uneven release that may occur in traditional negative ion fabrics. DETAILED DESCRIPTION The present invention will be further described below in conjunction with embodiments, which are explanations of the present invention and are not limited to the following embodiments: Example 1 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 8 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 1:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion and the polyvinyl alcohol solution are uniformly mixed to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 0.7wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into a syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed at the same time, and the electrostatic spinning is performed. The parameters of the filament are: spinning injection volume is 0.8mL, injection rate is 1mL / h; the parameters of electrostatic spray are: spray injection volume is 1mL / h, injection rate is 0.5mL / h; the rotation speed of the drum in the roller electrospinning device is 1200r / min, the receiving distance is 10cm, and finally heat treatment is carried out. The gradient heating program of the heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.5h, and the heating rates are 2℃ / min, 2℃ / min, 5℃ / min respectively, to obtain a composite negative ion release layer, and the porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 43.9%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Example 2 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 1.5:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion and the polyvinyl alcohol solution are uniformly mixed to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 0.8wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into a syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed at the same time, and the electrostatic spinning is performed. The parameters of the filament are: spinning injection volume is 0.8mL, injection rate is 0.6mL / h; the parameters of electrostatic spray are: spray injection volume is 0.6mL / h, injection rate is 1mL / h; the rotation speed of the drum in the roller electrospinning device is 1000r / min, the receiving distance is 15cm, and finally heat treatment is carried out. The gradient heating program of the heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1h, and the heating rates are 3℃ / min, 3℃ / min, 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 50.6%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Example 3 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 10 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 2:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion liquid and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 0.9wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrostatic spinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into a syringe, and a roller electrostatic spinning device is used to apply an electrostatic field, and the polyimide electrostatic spinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed at the same time, The parameters of electrospinning are: spinning injection volume is 1mL, injection rate is 1mL / h; the parameters of electrostatic spraying are: spray injection volume is 1mL / h, injection rate is 1mL / h; the rotation speed of the drum in the roller electrospinning device is 800r / min, the receiving distance is 15cm, and finally heat treatment is carried out. The gradient heating program of heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.5h, and the heating rates are 3℃ / min, 3℃ / min, 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 45.1%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Example 4 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 2:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion liquid and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into the syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are simultaneously electrostatically spun, and the electrostatic spinning is performed. The parameters are: spinning injection volume is 0.8mL, injection rate is 0.8mL / h; the parameters of electrostatic spray are: spray injection volume is 0.8mL / h, injection rate is 1mL / h; the rotation speed of the drum in the roller electrospinning device is 600r / min, the receiving distance is 12cm, and finally heat treatment is carried out. The gradient heating program of heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.2h, and the heating rates are 3℃ / min, 3℃ / min, 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 55.7%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 1 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 10 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 1.5:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion and the polyvinyl alcohol solution are evenly mixed to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into the syringe, and a roller electrospinning device is used to apply an electrostatic field. The polyimide electrospinning solution is firstly used for electrospinning. The parameters of the electrospinning are: the spinning injection volume is 0.8mL, the injection rate is 0.8mL / h, and the electrospinning structure is formed. After beaming, electrostatic spraying was performed with an electrostatic spray solution containing negative ion powder and MOFs metal skeleton. The parameters of electrostatic spraying were: spray injection volume of 0.8 mL / h, injection rate of 1 mL / h; the rotating drum speed in the roller electrospinning device was 600 r / min, the receiving distance was 12 cm, and finally heat treatment was performed. The gradient heating program of the heat treatment was to maintain at 100°C, 200°C and 300°C for 1.2 h, and the heating rates were 3°C / min, 3°C / min, and 5°C / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer was 44.6%. S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 2 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 10 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 1.5:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into a syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed at the same time, and the electrospinning The parameters are: spinning injection volume is 0.8mL, injection rate is 0.8mL / h; the parameters of electrostatic spray are: spray injection volume is 0.8mL / h, injection rate is 1mL / h; the rotation speed of the drum in the roller electrospinning device is 1500r / min, the receiving distance is 12cm, and finally heat treatment is carried out. The gradient heating program of the heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.2h, and the heating rates are 3℃ / min, 3℃ / min, and 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 78.9%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 3 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to water, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 2:1, stirring and dispersing uniformly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion liquid and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into the syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are simultaneously electrostatically spun, and the electrostatic spinning is performed. The parameters are: spinning injection volume is 0.8mL, injection rate is 0.8mL / h; the parameters of electrostatic spray are: spray injection volume is 0.8mL / h, injection rate is 1mL / h; the rotation speed of the drum in the roller electrospinning device is 100r / min, the receiving distance is 12cm, and finally heat treatment is carried out. The gradient heating program of heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.2h, and the heating rates are 3℃ / min, 3℃ / min, 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 26.9%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 4 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. Provide an electrostatic spray solution containing negative ion powder, prepared by a method comprising the following steps: Adding nano tourmaline powder into water, stirring and dispersing evenly to obtain a dispersion; Adding heated polyvinyl alcohol solution to water and stirring evenly to obtain a polyvinyl alcohol solution; The dispersion liquid and the polyvinyl alcohol solution are uniformly mixed to obtain an electrostatic spray solution containing tourmaline powder, wherein the content of the nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of the polyvinyl alcohol in the electrostatic spray solution is 8wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder were injected into the syringe respectively, and the electrostatic field was applied by using the roller electrospinning device. The electrostatic spinning of the polyimide electrospinning solution and the electrostatic spray of the electrostatic spray solution containing negative ion powder were carried out at the same time. The parameters of electrospinning were: spinning injection volume of 0.8mL, injection rate of 0.8mL / h; the parameters of electrostatic spraying were: spray injection volume of 0.8mL / h, injection rate of 1mL / h; the rotating drum speed in the roller electrospinning device was 600r / min, and the receiving distance was 12cm. Finally, heat treatment was carried out. The gradient heating program of the heat treatment was to maintain at 100℃, 200℃ and 300℃ for 1.2h, and the heating rates were 3℃ / min, 3℃ / min, and 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer was 55.7%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 5 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. The nano-tourmaline powder is added to the polyimide electrospinning solution and ultrasonically dispersed to obtain a polyimide electrospinning solution containing tourmaline powder; S3. The prepared polyimide electrospinning solution containing tourmaline powder was injected into a syringe, and electrospinning was performed by using a roller electrospinning device and applying an electrostatic field. The electrospinning parameters were as follows: the spinning injection volume was 1.5 mL, and the injection rate was 1 mL / h; the rotating drum speed in the roller electrospinning device was 600 r / min, and the receiving distance was 12 cm. Finally, heat treatment was performed. The gradient heating program of the heat treatment was maintained at 100°C, 200°C and 300°C for 1.2 h, and the heating rates were 3°C / min, 3°C / min, and 5°C / min, respectively, to obtain a composite negative ion release layer with a porosity of 55.5%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Comparative Example 6 A method for preparing a negative ion fabric that vibrates with acoustic wave excitation comprises the following steps: S1. Providing a polyimide electrospinning solution, which is prepared by a method comprising the following steps: Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; The transparent solution was placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether was added, and the mixture was stirred to react evenly to obtain a PAA precursor solution with a concentration of 9 wt%, which was the polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOF-5 metal skeleton, prepared by a method comprising the following steps: adding nano-tourmaline powder and micron-sized MOF-5 metal skeleton to DMF, the mass ratio of nano-tourmaline powder to MOF-5 metal skeleton is 2:1, stirring and dispersing uniformly to obtain a dispersion; The dispersion liquid and the spinning solution prepared in step S1 are uniformly mixed to obtain an electrostatic spray solution containing tourmaline powder and MOF-5 metal skeleton, wherein the content of the nano tourmaline powder in the electrostatic spray solution is 1wt%, and the content of the polyimide in the electrostatic spray solution is 7wt%; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are injected into the syringe respectively, and the electrostatic field is applied by using the roller electrospinning device, and the polyimide electrospinning solution is electrospun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrospun at the same time. The electrospinning parameters are: spinning injection volume is 0.8mL, and the injection rate is 0.8mL / h; the electrostatic spraying parameters are: spray injection volume is 0.8mL / h, and the injection rate is 1mL / h; the roller speed in the roller electrospinning device is 600r / min, and the receiving distance is 12cm. Finally, heat treatment is carried out. The gradient heating program of the heat treatment is to maintain at 100℃, 200℃ and 300℃ for 1.2h, and the heating rates are 3℃ / min, 3℃ / min, and 5℃ / min, respectively, to obtain a composite negative ion release layer. The porosity of the polyimide electrospinning membrane in the composite negative ion release layer is 58.9%; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric. Performance Test: With reference to GB / T 18809-2019 "General Specification for Air Ion Meters", an air negative ion detector was used to test the negative ion release performance. The test conditions were: ambient temperature (20±2)℃, relative humidity 45%~75%, and sound waves of different frequencies were emitted in the test environment. Table 1 shows the amount of negative ions generated under different sound wave rates (pcs / cm 3 )(The sound wave emission time is 30 minutes) 200Hz 3000Hz 5000Hz Example 1 852 1369 1423 Example 2 923 1456 1478 Example 3 888 1414 1445 Example 4 911 1587 1598 Comparative Example 1 469 942 998 Comparative Example 2 554 856 912 Comparative Example 3 518 689 789 Comparative Example 4 585 875 899 Comparative Example 5 577 956 1026 Comparative Example 6 612 889 1001 Table 2 shows the amount of negative ions generated at different sound wave emission times at a frequency of 200 Hz (pcs / cm 3 ) 60min 120min Example 1 1456 2103 Example 2 1521 2210 Example 3 1498 2023 Example 4 1518 2185 Comparative Example 1 885 1236 Comparative Example 2 899 1357 Comparative Example 3 854 1295 Comparative Example 4 912 1326 Comparative Example 5 926 1469 Comparative Example 6 997 1556 Table 3 shows the amount of negative ions generated by mechanical kneading and rubbing followed by acoustic wave emission at a frequency of 200 Hz for 30 minutes (pcs / cm 3 ) Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A negative ion fabric with acoustic wave excitation vibration, characterized in that: The negative ion fabric comprises a fabric layer and a composite negative ion release layer, the composite negative ion release layer comprises an electrospinning membrane and negative ion particles, the electrospinning membrane is a polyimide electrospinning membrane, and the negative ion particles are MOF hybrid materials coated with negative ion powder.

2. The negative ion fabric with acoustic wave excitation vibration according to claim 1, characterized in that: The porosity of the polyimide electrospinning membrane is 40-60%.

3. A method for preparing the negative ion fabric with acoustic wave excitation vibration as claimed in claim 1 or 2, characterized in that: The following steps are involved: S1. Providing polyimide electrospinning solution; S2. Providing an electrostatic spray solution containing negative ion powder and MOFs metal skeleton; S3. The prepared polyimide electrospinning solution and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton are respectively injected into the syringe, and a roller electrospinning device is used to apply an electrostatic field, and the polyimide electrospinning solution is electrostatically spun and the electrostatic spray solution containing negative ion powder and MOFs metal skeleton is electrostatically sprayed, and finally heat-treated to obtain a composite negative ion release layer; S4. Compounding the composite negative ion releasing layer and the fabric layer to obtain negative ion fabric.

4. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 3, characterized in that: The polyimide electrospinning solution in step S1 is prepared by a method comprising the following steps: S11. Dissolve diaminodiphenyl ether in DMF and stir to obtain a transparent solution; S12. The transparent solution is placed in an ice bath, and then pyromellitic anhydride in an amount equal to that of diaminodiphenyl ether is added, and the mixture is stirred to react uniformly to obtain a PAA precursor solution with a concentration of 8-10 wt %, which is the polyimide electrospinning solution.

5. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 3, characterized in that: The electrostatic spray solution containing negative ion powder and MOFs metal skeleton in step S2 is prepared by a method comprising the following steps: S21. Adding the nano-anion powder and the submicron or micron MOFs metal skeleton to water, stirring and dispersing uniformly to obtain a dispersion; S22. The polyvinyl alcohol solution was heated in water and stirred to obtain a polyvinyl alcohol solution; S23. The dispersion liquid and the polyvinyl alcohol solution are mixed evenly to obtain an electrostatic spray solution containing negative ion powder and MOFs metal skeleton.

6. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 3, characterized in that: The parameters of the electrospinning in step S3 are as follows: the spinning injection volume is 0.8-1 mL, and the injection rate is 0.6-1 mL / h; the parameters of the electrostatic spraying are as follows: the spraying injection volume is 0.6-1 mL / h, and the injection rate is 0.5-1 mL / h; the rotating speed of the roller electrospinning device is 600-1200 r / min, and the receiving distance is 10-15 cm.

7. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 1, characterized in that: The gradient temperature increase program of the heat treatment in step S3 is to maintain at 100°C, 200°C and 300°C for 1-1.5h, and the heating rates are 2-3°C / min, 2-3°C / min, and 3-5°C / min, respectively.

8. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 5, characterized in that: In the step S21, the mass ratio of the nano-sized negative ion powder to the MOFs metal skeleton is 1-2:

1.

9. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 5, characterized in that: In the step S23, the concentration of polyvinyl alcohol in the electrostatic spray solution is 6-10wt%, and the content of nano anion powder in the electrostatic spray solution is 0.7-1wt%.

10. The method for preparing the negative ion fabric with acoustic wave excitation vibration according to claim 5, characterized in that: In the step S21, the MOFs metal skeleton is MOF-5.

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