Moisture-conducting antibacterial fabric

Abstract

The utility model belongs to the technical field of moisture-conducting fabrics, and discloses a moisture-conducting antibacterial fabric which comprises a polylactic acid layer and a photolysis substrate layer which are connected from top to bottom, a plurality of moisture guiding channels are formed in the polylactic acid layer and penetrate through the polylactic acid layer; a temperature-sensitive hydrogel coating with a hydroxyl group is arranged on the inner wall of the moisture guiding channel, and the inner wall of the moisture guiding channel is fixedly connected with the temperature-sensitive hydrogel coating with the hydroxyl group; a polyvinylidene fluoride film with a hydroxyl group is arranged on the surface of the temperature-sensitive hydrogel coating with the hydroxyl group, and the surface of the temperature-sensitive hydrogel coating with the hydroxyl group is fixedly connected with the polyvinylidene fluoride film with the hydroxyl group; and the photolysis substrate layer is a photocatalytic formaldehyde-removing antibacterial functional fabric. The porosity is increased through swelling of the temperature-sensitive hydrogel, stress is uniformly transmitted to the polyvinylidene fluoride film through swelling to generate an electric signal, and then the electric signal acts on the photocatalytic substrate layer to excite a photocatalyst to generate more active substances, so that the photocatalytic sterilization effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wet -conducting fabric technical field relates to a wet -conducting antibacterial fabric. BACKGROUND

[0002] The conventional wet -conducting fabric relies on fixed hydrophilic and hydrophobic gradient, cannot dynamic response human motion intensity or environmental temperature change, this leads to fixed gradient to adjust wet -conducting rate according to sweat volume, when high -intensity exercise, the amount of sweat increases suddenly leads to wet -conducting channel blockage, inner layer cannot promptly discharge wet, and wet -permeable efficiency drops by more than 50%, and human sweat cannot be discharged promptly, and the core body temperature rises, will induce heat stroke, heat exhaustion and other symptoms, and the local closed space formed by wet -conducting channel blockage, will make bacterial reproduction rate increase 3-5 times, can cause dermatitis, folliculitis and other skin inflammation;In low -intensity exercise, the amount of heat produced by human body is low, and the amount of sweat secretion is less, if the wet -conducting of textile material is too strong, sweat will quickly transfer from the skin surface (inner layer) to the outer layer of fabric, when the moisture absorption capacity of outer layer fiber reaches the limit, moisture can reverse osmosis to the inner layer, and the humidity gradient reversal phenomenon is formed, and this reverse osmosis not only brings cold stimulation, but also can destroy the pH value of skin surface, and increase the risk of dermatitis and other skin inflammation.

[0003] The photocatalytic material can remove organic matter and bacteria, and when the wet -conducting channel is blocked, the photocatalytic material is more needed to remove the bacteria and the like. The literature (Preparation of TiO2 Film Doped with Metal Ions and Its Photocatalytic Degradation Performance of Toluene. Catalysis Communications 26.6 (2005): 5.) records that in the photocatalytic reaction, the intermediate product is easy to be preferentially adsorbed on the surface of the catalyst and form a stable covering layer, so that the active sites are permanently occupied, and the accumulation amount of the intermediate product directly affects the activity of the photocatalysis.

[0004] Therefore, it is of great significance to study a wet -conducting antibacterial fabric to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model discloses a wet -conducting antibacterial fabric to solve the problems in the prior art.

[0006] To achieve the above object, the utility model adopts the technical scheme as follows:

[0007] The wet-conducting and antibacterial fabric comprises a polylactic acid layer and a photolysis base layer connected from top to bottom; a plurality of wet-conducting channels are arranged on the polylactic acid layer, and the wet-conducting channels penetrate through the polylactic acid layer; the inner wall of the wet-conducting channel is provided with a temperature-sensitive hydrogel coating with hydroxyl groups, and the inner wall of the wet-conducting channel and the temperature-sensitive hydrogel coating with hydroxyl groups are fixedly connected through chemical bonding; the surface of the temperature-sensitive hydrogel coating with hydroxyl groups is provided with a polyvinylidene fluoride (PVDF) film with hydroxyl groups, and the surface of the temperature-sensitive hydrogel coating with hydroxyl groups and the polyvinylidene fluoride (PVDF) film with hydroxyl groups are fixedly connected through chemical bonding; the photolysis base layer is a photocatalytic formaldehyde-removing antibacterial functional fabric.

[0008] The temperature-sensitive hydrogel coating with hydroxyl groups is prior art, and its fixation on the inner wall of the wet-conducting channel is prior art, referring to the temperature-sensitive hydrogel paint and its preparation method, coating and application of the coating provided in CN116376388A, specifically, the polylactic acid surface is self-provided with hydroxyl groups, the temperature-sensitive hydrogel is covered on the polylactic acid, and then curing is performed at 80-85℃ for 3-5min; after curing, covalent cross-linking is formed between the temperature-sensitive hydrogel coating and the inner wall of the wet-conducting channel.

[0009] The polyvinylidene fluoride (PVDF) film with hydroxyl groups fixed on the temperature-sensitive hydrogel coating with hydroxyl groups is also prior art, referring to the spinning solution for obtaining high-strength composite piezoelectric fiber film in CN202411618940, and then referring to the temperature-sensitive hydrogel paint and its preparation method, coating and application of the coating provided in CN116376388A, the obtained spinning solution for high-strength composite piezoelectric fiber film is covered on the temperature-sensitive hydrogel with hydroxyl groups, since the solute in the spinning solution contains a large number of hydroxyl groups (see CN202411618940), so the spinning solution is cured after being covered on the temperature-sensitive hydrogel with hydroxyl groups, and covalent cross-linking is formed between the polyvinylidene fluoride (PVDF) film with hydroxyl groups and the temperature-sensitive hydrogel coating with hydroxyl groups after curing.

[0010] The method of "hydroxyl-containing temperature-sensitive hydrogel covering polylactic acid" and "spinning solution covering hydroxyl-containing temperature-sensitive hydrogel" is the prior art, using a vacuum negative pressure coating device provided by CN202021847257.8, and by adjusting the vacuum degree negative pressure and immersion time, the negative pressure value is dynamically adjusted with the coating process to avoid the absorption of excessive hydroxyl-containing temperature-sensitive hydrogel due to sudden change of negative pressure, and after coating and taking out, it is pulled at a uniform speed at an inclination angle (15-30°) to prevent the flow channel from being blocked. The reason why "after coating and taking out, it is pulled at a uniform speed at an inclination angle (15-30°)" can prevent the flow channel from being blocked is because it takes advantage of the balance between the surface tension of the liquid and the surface of the solid. Under the inclination angle of 15-30°, the three-phase contact line (gas-liquid-solid interface) forms the optimal wetting state, so that the hydroxyl-containing temperature-sensitive hydrogel can uniformly cover the surface of the substrate without accumulating at the edge. Uniform pulling avoids the capillary effect disorder caused by sudden change of speed, preventing the hydroxyl-containing temperature-sensitive hydrogel from forming local dryness or accumulation in the narrow flow channel due to imbalance of surface tension. This control method is particularly suitable for precision coating; and when the coating is pulled at a uniform speed at an inclination angle of 15-30°, the hydroxyl-containing temperature-sensitive hydrogel will form a uniform downward flow path under the action of gravity. This directional flow helps to discharge excess hydroxyl-containing temperature-sensitive hydrogel and bubbles, avoiding blockage caused by local accumulation. The inclination angle design not only ensures enough gravity component to drive the flow of hydroxyl-containing temperature-sensitive hydrogel, but also prevents the hydroxyl-containing temperature-sensitive hydrogel from flowing too fast due to too large angle; uniform motion ensures stable fluid shear force and maintains the uniformity of the thickness of the hydroxyl-containing temperature-sensitive hydrogel.

[0011] The hydroxyl density at the end of the polylactic acid molecular chain is much smaller than that of the temperature-sensitive hydrogel. This order of magnitude difference makes it possible for the temperature-sensitive hydrogel to retain a large number of unreacted hydroxyl groups even if all the polylactic acid hydroxyl groups are completely reacted. The activation energy of hydroxyl self-condensation is as high as 85-100 kJ / mol (acid / base catalysis is required), while the temperature-sensitive hydrogel lacks an effective catalyst, and water molecules will compete with hydroxyl groups for hydrogen bonds, reducing the probability of effective collision. From a thermodynamic analysis, hydroxyl self-crosslinking will significantly reduce the conformational entropy of the polymer chain, which is thermodynamically unfavorable. Therefore, after the reaction of the hydroxyl-containing temperature-sensitive hydrogel with polylactic acid, there are still hydroxyl groups left to chemically crosslink with the hydroxyl-containing PVDF spinning solution.

[0012] The photolysis base layer is a prior art, referring to CN202211212063.4 Preparation method of photocatalytic formaldehyde removal and antibacterial functional fabric.

[0013] When a person is in high intensity exercise or high ambient temperature, the temperature-sensitive hydrogel can quickly respond to temperature changes and swell, realize the release of sweat moisture and heat by increasing the porosity (i.e. increasing the inner diameter of the moisture conducting channel), and at the same time, evenly transmit stress to the polyvinylidene fluoride (PVDF) film with hydroxyl groups by swelling, stabilize the output piezoelectric charge, and the internal electric field can induce the polar arrangement of water molecules, further accelerate the directional discharge of moisture from the inner wall to the outside; when a person is in low intensity exercise or low ambient temperature, the temperature-sensitive hydrogel can quickly respond to temperature changes and shrink, and present a gel state at low temperature, the pores are closed to form a heat insulation layer.

[0014] When the temperature-sensitive hydrogel swells, the porosity increases, and the open channels formed by high porosity shorten the diffusion path of pollutants to the photolysis substrate layer, improve the mass transfer efficiency, and promote the rapid migration of target substances to the photolysis substrate layer, thereby accelerating the photocatalytic redox reaction. When the temperature-sensitive hydrogel swells, the temperature-sensitive hydrogel evenly transmits stress to the polyvinylidene fluoride (PVDF) film with hydroxyl groups to generate electric signals, and these electric signals can directly act on the photocatalytic substrate layer to excite the photocatalyst to produce more active substances, thereby enhancing the photocatalytic bactericidal effect.

[0015] In the prior art, high-energy active sites exist on the surface of the photocatalyst, and the adsorption energy of the intermediate product is much higher than that of the reactant due to the formation of a strong chemical bond between the intermediate product and the atoms on the surface of the catalyst. The oxygen vacancies on the surface of the photocatalyst will preferentially adsorb polar intermediates to form a local electron cloud enrichment area, hindering the approach of subsequent reactants. In the present application, when the polyvinylidene fluoride (PVDF) film with hydroxyl groups is subjected to mechanical stress (such as stretching or bending), electric charges will be generated on its surface. These electric charges can adsorb ionic intermediates and achieve targeted enrichment through electrostatic attraction. The fluorine atoms on the polyvinylidene fluoride (PVDF) film with hydroxyl groups can combine with the intermediate product through hydrogen bonds and van der Waals forces, prolonging the residence time and preventing the preferential adsorption of the intermediate product on the surface of the catalyst.

[0016] As a preferred technical solution:

[0017] The moisture conducting channel is a circular truncated cone channel; the large end of the circular truncated cone channel has a diameter of 50-200 μm, and the large end of the circular truncated cone channel is located on the upper surface of the polylactic acid layer; the small end of the circular truncated cone channel has a diameter of 10-30 μm, and the small end of the circular truncated cone channel is located on the lower surface of the polylactic acid layer; the large end of the circular truncated cone channel can improve the air flow efficiency, and the small end can block dust particles, and at the same time, the capillary effect is realized to increase the moisture permeation amount.

[0018] The thickness of the polylactic acid layer is 1.5-3 mm, and the thickness of the photolysis substrate layer is 1-4 mm.

[0019] A moisture-conducting and antibacterial fabric as described above, wherein the thickness of the temperature-sensitive hydrogel coating is 1.5-4 microns. 。

[0020] A moisture-conducting and antibacterial fabric as described above, wherein the thickness of the polyvinylidene fluoride (PVDF) film with hydroxyl groups is 1.5-4 microns.

[0021] A moisture-conducting and antibacterial fabric as described above, wherein the polylactic acid layer and the photolysis substrate layer are fixedly connected by ultrasonic welding.

[0022] Advantages:

[0023] (1) The temperature-sensitive hydrogel swells to increase the porosity, and the open channels formed by the high porosity can shorten the diffusion path of pollutants to the photolysis substrate layer, improve the mass transfer efficiency, and promote the rapid migration of target substances to the photolysis substrate layer, thereby accelerating the photocatalytic oxidation-reduction reaction.

[0024] (2) When the temperature-sensitive hydrogel swells, the uniform swelling transmits stress to the polyvinylidene fluoride (PVDF) film with hydroxyl groups to generate electrical signals, which can directly act on the photocatalytic substrate layer to excite the photocatalyst to produce more active substances, thereby enhancing the photocatalytic sterilization effect.

[0025] (3) When the polyvinylidene fluoride film with hydroxyl groups is subjected to mechanical stress, electric charges will be generated on its surface, which can adsorb ionic intermediates and achieve targeted enrichment through electrostatic attraction. In addition, the fluorine atoms of the polyvinylidene fluoride (PVDF) film with hydroxyl groups can also combine with the intermediates through hydrogen bonds and van der Waals forces, prolonging the residence time and preventing the preferential adsorption of intermediates on the surface of the catalyst. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the moisture-conducting and antibacterial fabric of the present application;

[0027] Figure 2 is a schematic view of the moisture-conducting channel of the present application;

[0028] Wherein, 1-poly lactic acid layer, 2-photolysis substrate layer, 3-temperature-sensitive hydrogel coating with hydroxyl groups, 4-polyvinylidene fluoride film with hydroxyl groups. DETAILED DESCRIPTION

[0029] The present application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0030] A moisture-conducting and antibacterial fabric, as shown in Figure 1 、 Figure 2 , comprises a polylactic acid layer 1 and a photolysis base layer 2 connected from top to bottom;

[0031] The thickness of the polylactic acid layer 1 is 1.5-3 mm, and a plurality of moisture-conducting channels are provided on the polylactic acid layer 1, wherein the moisture-conducting channels are circular truncated cone channels; the large end diameter of the circular truncated cone channels is 50-200 μm, and the large end of the circular truncated cone channels is located on the upper surface of the polylactic acid layer 1; the small end diameter of the circular truncated cone channels is 10-30 μm, and the small end of the circular truncated cone channels is located on the lower surface of the polylactic acid layer 1;

[0032] The inner wall of the moisture-conducting channel is provided with a hydroxyl-containing temperature-sensitive hydrogel coating, and the inner wall of the moisture-conducting channel is chemically bonded with the hydroxyl-containing temperature-sensitive hydrogel coating; the thickness of the temperature-sensitive hydrogel coating is 1.5-4 μm;

[0033] The surface of the hydroxyl-containing temperature-sensitive hydrogel coating 3 is provided with a hydroxyl-containing polyvinylidene fluoride film 4, and the surface of the hydroxyl-containing temperature-sensitive hydrogel coating 3 is chemically bonded with the hydroxyl-containing polyvinylidene fluoride film 4;

[0034] The photolysis base layer 2 is a photocatalytic formaldehyde-removing and antibacterial functional fabric, and the thickness of the photolysis base layer 2 is 1-4 mm;

[0035] The thickness of the hydroxyl-containing polyvinylidene fluoride film 4 is 1.5-4 μm;

[0036] The polylactic acid layer 1 and the photolysis base layer 2 are fixedly connected through ultrasonic welding.

[0037] To verify the moisture-conducting and antibacterial performance of the above moisture-conducting and antibacterial fabric, the following examples are carried out:

[0038] Example 1

[0039] A moisture-conducting and antibacterial fabric, the thickness of the polylactic acid layer is 1.5 mm, the large end diameter of the circular truncated cone channels is 50 μm, the small end diameter of the circular truncated cone channels is 10 μm, the thickness of the temperature-sensitive hydrogel coating is 1.5 μm, the thickness of the hydroxyl-containing polyvinylidene fluoride film is 1.5 μm, and the thickness of the photolysis base layer is 1 mm;

[0040] The polylactic acid layer is prepared by using 3D printing technology;

[0041] The hydroxyl-containing temperature-sensitive hydrogel coating on the inner wall of the moisture-conducting channel on the polylactic acid layer is chemically bonded to the inner wall of the moisture-conducting channel and the temperature-sensitive hydrogel coating with hydroxyl groups by using the device of Example 1 in the patent with the authorization announcement number CN214600069U and referring to the method of Example 2 in the patent application with the application publication number CN116376388A; wherein the negative pressure value of the device used is -0.10 MPa;

[0042] The hydroxyl-containing polyvinylidene fluoride film provided on the surface of the temperature-sensitive hydrogel coating with hydroxyl groups is formed by using the device of Example 1 in the patent with the authorization announcement number CN214600069U to coat the piezoelectric polyvinylidene fluoride spinning solution with hydroxyl groups (prepared according to Example 1 in the patent application with the application publication number CN119465512A) on the surface of the temperature-sensitive hydrogel coating with hydroxyl groups, and then referring to the method of Example 2 in the patent application with the application publication number CN116376388A to solidify and form the polyvinylidene fluoride film with hydroxyl groups, which is chemically bonded to the temperature-sensitive hydrogel coating with hydroxyl groups; wherein the negative pressure value of the device used is -0.10 MPa;

[0043] The photolysis base layer is prepared according to Example 1 in the patent application with the application publication number CN115467158A;

[0044] At an ambient temperature of 38°C, the moisture permeability of the above-mentioned moisture-conducting and antibacterial fabric is measured to be 11200 g / (m 2 ·24h) according to the GB / T 12704.1-2009 standard, and the sterilization rate of the above-mentioned moisture-conducting and antibacterial fabric on Escherichia coli is 98.6%, and the sterilization rate on Staphylococcus aureus is 96.2% according to the WST650-2019 standard.

[0045] Example 2

[0046] A moisture-conducting and antibacterial fabric, the thickness of the polylactic acid layer is 3 mm, the large end diameter of the circular truncated cone-shaped channel is 200 μm, the small end diameter of the circular truncated cone-shaped channel is 30 μm, the thickness of the temperature-sensitive hydrogel coating is 4 μm, the thickness of the polyvinylidene fluoride film with hydroxyl groups is 4 μm, and the thickness of the photolysis base layer is 4 mm; wherein:

[0047] The polylactic acid layer is prepared by using 3D printing technology;

[0048] The hydroxyl-containing temperature-sensitive hydrogel coating on the inner wall of the moisture-conducting channel on the polylactic acid layer is chemically bonded to the inner wall of the moisture-conducting channel and the temperature-sensitive hydrogel coating with hydroxyl groups by using the device of Example 1 in the patent with the authorization announcement number CN214600069U and referring to the method of Example 2 in the patent application with the application publication number CN116376388A; wherein the negative pressure value of the device used is -60 kPa;

[0049] The surface of the hydroxyl-containing temperature-sensitive hydrogel coating is provided with a hydroxyl-containing polyvinylidene fluoride film, which is prepared by using the device of Example 1 in the patent with the authorization announcement No. CN214600069U, coating the hydroxyl-containing piezoelectric polyvinylidene fluoride spinning solution (prepared according to Example 1 in the patent application with the application publication No. CN119465512A) on the surface of the hydroxyl-containing temperature-sensitive hydrogel coating, and then referring to the method of Example 2 in the patent application with the application publication No. CN116376388A, curing to form a hydroxyl-containing polyvinylidene fluoride film, and combining with the hydroxyl-containing temperature-sensitive hydrogel coating through a chemical bond; wherein the negative pressure value of the device used is-60 kPa;

[0050] The photolysis base layer is prepared according to Example 1 in the patent application with the application publication No. CN115467158A;

[0051] At an ambient temperature of 38℃, the moisture permeability of the above-mentioned moisture-conducting and antibacterial fabric is 11900 g / (m 2 ·24h) according to GB / T 12704.1-2009 standard, and the sterilization rate of the above-mentioned moisture-conducting and antibacterial fabric on Escherichia coli is 98.7%, and the sterilization rate on Staphylococcus aureus is 96.4% according to WST650-2019 standard;

[0052] At an ambient temperature of 36℃, the moisture permeability of the above-mentioned moisture-conducting and antibacterial fabric is 9600 g / (m 2 ·24h) according to GB / T 12704.1-2009 standard;

[0053] At an ambient temperature of 35℃, the moisture permeability of the above-mentioned moisture-conducting and antibacterial fabric is 8200 g / (m 2 ·24h) according to GB / T 12704.1-2009 standard.

Claims

1. A moisture-conducting antibacterial fabric, characterized by, The application relates to a light-decomposing base layer and a polylactic acid layer connected from top to bottom; a plurality of moisture-conducting channels are arranged on the polylactic acid layer and penetrate the polylactic acid layer; the inner wall of the moisture-conducting channel is provided with a temperature-sensitive hydrogel coating layer with hydroxyl groups, and the inner wall of the moisture-conducting channel is fixedly connected with the temperature-sensitive hydrogel coating layer with hydroxyl groups; the surface of the temperature-sensitive hydrogel coating layer with hydroxyl groups is provided with a polyvinylidene fluoride film with hydroxyl groups, and the surface of the temperature-sensitive hydrogel coating layer with hydroxyl groups is fixedly connected with the polyvinylidene fluoride film with hydroxyl groups; and the light-decomposing base layer is a photocatalytic formaldehyde-removing antibacterial functional fabric.

2. The moisture-conducting antibacterial fabric according to claim 1, wherein The moisture-conducting channel is a circular truncated cone channel; the large end of the circular truncated cone channel has a diameter of 50-200 mu m, and the large end of the circular truncated cone channel is located on the upper surface of the polylactic acid layer; the small end of the circular truncated cone channel has a diameter of 10-30 mu m, and the small end of the circular truncated cone channel is located on the lower surface of the polylactic acid layer.

3. The moisture-conducting antibacterial fabric according to claim 2, wherein The thickness of the polylactic acid layer is 1.5-3 mm, and the thickness of the light-decomposing base layer is 1-4 mm.

4. The moisture-conducting antibacterial fabric according to claim 3, wherein The thickness of the temperature-sensitive hydrogel coating is 1.5 to 4 μm 。 5. The moisture-conducting antibacterial fabric according to claim 4, wherein The thickness of the polyvinylidene fluoride film with hydroxyl groups is 1.5-4 mu m.

6. The moisture-conducting antibacterial fabric according to claim 1, wherein The polylactic acid layer and the light-decomposing base layer are fixedly connected.

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