After-finishing process of microporous fiber cloth

Abstract

The invention relates to an after-finishing process of microporous fiber cloth, which is characterized in that the microporous fiber cloth is subjected to assistant functional finishing by adopting an impregnation method, so that the microporous fiber cloth has a loading function; the fiber cloth is impregnated in a liquid tank by adopting an auxiliary agent, and the method comprises auxiliary agent preparation operation and padding operation. The auxiliary agent comprises a finishing agent, and the finishing agent is prepared from a composite catalytic material and water or a titanium zirconium phosphate adsorption material and water; according to the padding operation, the fiber cloth is soaked in a liquid tank for dipping adsorption, a dipping liquid is obtained by adding a nonionic cross-linking agent into a dispersed particle liquid, under the condition that the pH is alkaline, the mode of two times of dipping and two times of padding is adopted, and the padding rate is 70%-75%; according to the after-finishing mode of the scheme, catalytic material particles are embedded into fiber micropores through physical adsorption, the prepared micropore fiber cloth is subjected to a formaldehyde catalytic oxidation reaction through a loaded catalytic material, formaldehyde is decomposed, and indoor air is purified; and a titanium zirconium phosphate adsorption material can also be loaded, so that the binding sites of bacteria and viruses are improved, and the bacteria and viruses are better killed.

Description

Technical Field

[0001] This invention relates to the field of functional microporous fabrics, specifically to a finishing process for microporous fiber fabrics. Background Technology

[0002] With the development of application demands in the textile manufacturing field, fiber fabrics have been developed to possess nanoporous structures, endowing them with corresponding unique properties. As a type of textile, finishing fiber fabrics to enable them to bear the required functions is a research direction for technical personnel. Finishing methods for textiles include impregnation and coating. The impregnation method is relatively simple to obtain fabrics that bear the required functions, but the fabric has the problem of poor hand feel. The coating method uses appropriate methods to uniformly coat functional substances onto the surface of the fabric to obtain functional textiles. This method is simple and convenient to operate, but the coating is easy to peel off during daily use. This invention uses a physical modification method based on fibers to first modify the fibers to obtain fiber textiles, and then performs finishing on the fiber textiles to enable them to bear the required functions. Summary of the Invention

[0003] To address the technical problems existing in the prior art, the present invention aims to provide a finishing process for microporous fiber fabric, enabling the fabric to undergo functional finishing with additives, thereby imbuing it with functional properties, particularly catalytic formaldehyde decomposition and antiviral functions. To achieve the above objective, the technical solution adopted by the present invention is: a finishing process for microporous fiber fabric, employing an impregnation method to perform functional finishing with additives on the microporous fiber fabric, thereby imbuing it with functional properties; wherein the microporous fiber fabric is made from fibers with a microporous structure using nonwoven or weaving processes;

[0004] Furthermore, a catalytic material is loaded onto the surface of the undried fiber filaments using a spray coating process to form a microporous fiber structure; the preparation process of the microporous fiber structure includes:

[0005] Step 1: The molten masterbatch is spun downwards through a spinneret, and the spun fibers form areas of undried fibers.

[0006] Step 2: Spray the composite catalyst material onto the undried area of ​​the fiber filaments, using the surface viscosity of the fiber to make the catalyst material adhere to the surface of the fiber filaments; at a distance of 15-20 cm from the spinneret, use a powder spraying device to vertically spray the composite catalyst material onto the undried area; the powder spraying device is located on the side of the fiber filaments, the distance between the powder spraying guns is 10 cm, the height of the nozzle from the spinneret is 10-15 cm, and the air pressure is 0.4-0.6 Pa;

[0007] The masterbatch mentioned in step one is a plastic masterbatch with a melting temperature of 220-280℃, which puts it in a high-temperature molten state; the melting temperature is determined according to the choice of masterbatch material.

[0008] The plastic masterbatch used is selected from at least one of polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS);

[0009] The undried area of ​​the fiber filaments mentioned in step two refers to the area within 25 cm extending downwards from the spinneret nozzle of the fiber filaments.

[0010] In step two, the powder spraying device is specifically configured with several powder spraying guns arranged in a row on one side directly below the spinneret nozzle of the spinneret, with the nozzles of the powder spraying guns facing the fibers ejected from the spinneret nozzle. The powder spraying direction of the powder spraying guns is perpendicular to the fiber exit direction ejected from the spinneret. The powder spraying guns are evenly distributed, with a spacing of 10 cm between each adjacent gun. The distance between the nozzle of the powder spraying gun and the corresponding horizontal height of the spinneret nozzle is set at 10-15 cm, and the air pressure is maintained at 0.4-0.6 Pa during powder spraying.

[0011] Step two also includes a catalyst material recovery step, in which free catalyst material is adsorbed by a negative pressure air mechanism;

[0012] The negative pressure air mechanism includes a powder collection bag and a powder collection pump. The powder collection pump is connected to the powder collection bag through a pipe. The negative pressure air generated by the negative pressure air mechanism can effectively adsorb and recover the free catalytic material and collect the catalytic material into the powder collection bag.

[0013] The catalyst material is MnCoO x The composite catalytic material is made of manganese salt, cobalt salt, oxalate and deionized water into nanospheres;

[0014] The MnCoO x The composite catalytic material is produced by optimizing the coupling of manganese-cobalt dual centers, first obtaining a manganese-cobalt precursor salt solution, then obtaining a manganese-cobalt salt precipitate, and then separating it by centrifugation, removing the solid product and drying it to make nano-spherical particles with a particle size of 100 nm.

[0015] The preparation steps for this catalytic material are as follows:

[0016] a. Dissolve a certain amount of manganese salt and cobalt salt in deionized water and stir at room temperature to obtain a manganese-cobalt precursor salt solution;

[0017] b. Dissolve oxalate in deionized water and add it to the manganese-cobalt precursor salt solution obtained in a above. Stir vigorously at a certain temperature for a certain time to obtain manganese-cobalt salt precipitate;

[0018] c. Centrifuge the precipitate obtained in step b above, wash repeatedly with deionized water until the washing liquid is clear, and dry the solid product to obtain MnCoO. xComposite catalytic materials;

[0019] The manganese salt and cobalt salt are potassium permanganate and cobalt nitrate, and the molar ratio of manganese salt to cobalt salt is 1:1-5.

[0020] The oxalate is ammonium oxalate monohydrate, and the molar ratio of manganese salt to oxalate is 1-5:1; the volume ratio of the manganese-cobalt precursor salt solution in step a to the oxalate solution in step b is 0.5-3:1; the temperature and stirring time in step b are 70-100℃ and 8-12h, respectively. Based on the above scheme of this application, the microporous fiber cloths prepared by the two different processes are subjected to functional finishing with additives by impregnation. The fiber cloths are impregnated in a liquid bath with additives, including additive preparation and impregnation operations.

[0021] The additives include finishing agents, which are prepared by mixing composite catalytic materials with water to form a dispersion with a concentration of 10-30 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid, the purpose of which is to optimize the dispersion of particles.

[0022] The impregnation and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption. The impregnation liquid is a dispersion of particles with added nonionic crosslinking agent. Under alkaline pH conditions, a two-immersion and two-binding method is used, with a binding residue rate of 70-75%. The impregnation and binding time is 30-50 minutes, and the impregnation and binding temperature is 60-80℃. The particle dispersion of the dispersion liquid is achieved by ultrasonic treatment to make the particle size uniform, D≤50nm, and the dispersion index≤0.15.

[0023] The microporous fiber cloth can also be functionally finished using an impregnation method. This involves impregnating the fiber cloth in a liquid bath with another auxiliary agent, including agent preparation and impregnation operations. The auxiliary agent includes a finishing agent, which is prepared by mixing zirconium titanium phosphate adsorbent with water to form a dispersion with a concentration of 10-30 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid. The technical effects of this invention are reflected in:

[0024] The post-processing method of this scheme involves embedding catalytic material particles into the micropores of fibers through physical adsorption, and then using a cross-linking agent to form a network structure to lock the particles. The process employs two dips and two bindings, with a binding residue rate of 70-75% to ensure penetration. The binding temperature promotes micropore expansion, and adjusting the pH to alkaline conditions enhances fiber swelling and adsorption. The dispersion of particles is achieved through ultrasonic treatment, which significantly improves particle permeability. During impregnation and adsorption, the cross-linking agent forms a three-dimensional network within the micropores of the fiber cloth, physically locking the particles. The final microporous structure refers to nanoscale pores with a pore size of 50-500 nm. The resulting microporous fiber cloth can be loaded with catalytic materials to catalyze the oxidation of formaldehyde, decomposing formaldehyde and purifying indoor air. Alternatively, it can be loaded with zirconium titanium phosphate adsorbents, utilizing the synergistic effect of composite materials to enhance the binding sites for bacteria and viruses, thereby better killing bacteria and viruses. Attached Figure Description

[0025] Figure 1 This is a flowchart of the microporous fiber cloth production process according to an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A structural diagram of the production equipment used in the production process of microporous fiber cloth.

[0027] Figure 3 for Figure 2 Side view.

[0028] Figure 4 This is a schematic diagram of the spinneret structure of the production equipment of the present invention.

[0029] Figure 5 MnCoO is used in the method for preparing microporous fibers of the present invention. x -I. SEM image of the composite catalytic material.

[0030] Figure 6 Water resistance tests of the catalyst materials in Example 2 and Comparative Example 1 (MnCoO) x -Ⅱ and MnO2-Ⅰ represent the catalytic materials prepared in Example 2 and Comparative Example 1, respectively.

[0031] In the diagram, 1. Spinneret, 1.1. Spinneret nozzle, 2. Fiber filament, 3. Powder spray gun nozzle, 4. Powder collection bag, 5. Powder collection pump, 6. Track. Detailed Implementation

[0032] The technical solution of the present invention will be further defined below with reference to the accompanying drawings and specific embodiments, but the scope of protection is not limited to the description.

[0033] Example 1

[0034] The finishing process of this invention is applied to microporous nonwoven fabrics produced by nonwoven fabric manufacturing processes. The process includes: web formation and hot pressing, impregnation, re-hot pressing, washing and purification, and drying and rolling.

[0035] Web formation and hot pressing: Fibers with adhesive catalyst material are sprayed onto the traveling belt 6 of the production equipment and collected by the traveling belt 6 to form a non-woven fabric; then the non-woven fabric is hot-pressed by a hot pressing roller;

[0036] Impregnation: The nonwoven fabric after heat pressing is impregnated in a liquid bath with a finishing agent, including the preparation of auxiliary agents and the impregnation and binding operation;

[0037] The additives include finishing agents, which are prepared by mixing composite catalytic materials with water to form a dispersion with a concentration of 10 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid, the purpose of which is to optimize the particle dispersion. The particle dispersion of the dispersion is achieved by ultrasonic treatment to make the particle size uniform, D≤50nm, and the dispersion index≤0.15.

[0038] The impregnation and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption. The impregnation solution is a dispersed granular solution with added nonionic crosslinking agent. Under alkaline pH conditions, a two-immersion and two-binding method is used, with a binding residue rate of 70-75%. The impregnation and binding time is 30 minutes, and the impregnation and binding temperature is 60℃. A second hot-pressing process follows: after impregnation and binding, excess liquid is squeezed out using rollers at a pressure of 0.2MPa, controlling the liquid retention rate at 60%-80%.

[0039] Water washing and purification: The non-woven fabric after heat pressing is put into a water tank, where the water tank is vibrated to wash away the catalytic material that has not adhered to the fibers.

[0040] Drying and rolling: The cleaned nonwoven fabric is put into a 30-50 meter drying oven for drying, which includes pre-drying and curing; Pre-drying: 80-100℃ hot air, remove moisture for 1-2 minutes; Curing: 130-160℃ baking, for 3-8 minutes; After drying, the fabric is rolled out; Finally, the catalytic material is attached to the microporous fiber nonwoven fabric to form a nanoporous structure, realizing the functional finishing of the microporous fiber nonwoven fabric.

[0041] The preparation process of the microporous fibers in the microporous fiber nonwoven fabric of this embodiment includes:

[0042] Step 1: Heat the PET masterbatch to 220℃ to melt it, and then spin it downwards through a spinneret; the spun fibers 2 form an undried area;

[0043] Step 2: Spray catalytic material onto the undried area of ​​fiber 2, using the surface viscosity of the fiber to make the catalytic material adhere to the fiber 2, forming a microporous fiber with a nanoporous structure; the undried area of ​​fiber 2 refers to the area within 25 cm downward from the spinneret 1.1 of the spinneret 1; the fiber 2 in this area is in the optimal viscosity state, and the fiber surface has a large viscosity.

[0044] In step two, the catalytic material is sprayed onto the undried area of ​​the fiber filaments 2 ejected from the spinneret 1 using a powder spraying device positioned 20 cm away from one side of the spinneret 1. The powder spraying device is arranged in rows of several powder spraying guns on one side directly below the spinneret nozzle 1.1 of the spinneret 1, with the nozzles 3 facing the fiber filaments 2 ejected from the nozzle 1.1. The powder spraying guns are evenly distributed, with a spacing of 10 cm between adjacent guns. The distance between the nozzle 3 and the corresponding horizontal height of the nozzle 1.1 is also 10 cm, and the air pressure is maintained at 0.5 Pa during spraying.

[0045] In step two, during the spraying process of the catalyst material, the catalyst material is recovered by using a negative pressure mechanism installed in the production equipment to recover the free catalyst material; the negative pressure recovery device (powder collection pump pressure -5kPa) recovers the unattached catalyst material.

[0046] The negative pressure air mechanism includes a powder collection bag 4 and a powder collection pump 5. The powder collection pump 5 is connected to the powder collection bag 4 through a pipe. The negative pressure air generated by the negative pressure air mechanism can effectively adsorb and recover the freed catalyst material and collect the catalyst material into the powder collection bag 4.

[0047] The catalyst is MnCoO x -Ⅰ Composite catalytic material, MnCoO x -Ⅰ The composite catalytic material was prepared by a redox method. Specific operational details are as follows: 5g of potassium permanganate and 5g of cobalt nitrate hexahydrate were dissolved in 100mL of deionized water, and then 5g of ammonium oxalate monohydrate was dissolved in 50mL of deionized water. The two fully dissolved solutions were rapidly mixed together and stirred vigorously at 90℃ for 10 hours. The resulting MnCoO₂ was then... x The precipitate was washed repeatedly with deionized water until the washing solution was clear. Then, the solid product was removed and dried to obtain MnCoO. x -Ⅰ Composite catalytic materials; from Figure 5 As can be seen from the prepared MnCoO xThe composite catalytic material exhibits an ultrathin needle-like morphology, and the needle-like nanoparticles further aggregate to form spherical particles with a particle size of approximately 100 nm. In this embodiment, the microporous fiber nonwoven fabric loaded with the finishing agent can enhance the catalytic oxidation reaction of formaldehyde at room temperature, decompose formaldehyde, and purify indoor air. Its catalytic material loading rate reaches 95%, and the formaldehyde decomposition rate is ≥99%.

[0048] Example 2

[0049] The microporous nonwoven fabric was prepared using the same process steps as in Example 1, and the subsequent finishing process included:

[0050] The process involves web forming and hot pressing, impregnation, re-hot pressing, water washing and purification, and drying into rolls.

[0051] in,

[0052] Impregnation: The nonwoven fabric after heat pressing is impregnated in a liquid bath with a finishing agent, including the preparation of auxiliary agents and the impregnation and binding operation;

[0053] The additives include finishing agents, which are prepared by mixing composite catalytic materials with water to form a dispersion with a concentration of 20 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid, the purpose of which is to optimize the particle dispersion. The particle dispersion of the dispersion is achieved by ultrasonic treatment to make the particle size uniform, D≤50nm, and the dispersion index≤0.15.

[0054] The impregnation and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption. The impregnation solution is a dispersed granular solution with added nonionic crosslinking agent. Under alkaline pH conditions, a two-immersion and two-binding method is used, with a binding residue rate of 70-75%. The impregnation and binding time is 40 minutes, and the impregnation and binding temperature is 70℃. A second hot-pressing process follows: after impregnation and binding, excess liquid is squeezed out using rollers at a pressure of 0.3MPa, controlling the liquid retention rate at 60%-80%.

[0055] The difference between the preparation process of the microporous fibers in this embodiment and that in Example 1 is that, taking the production of short-fiber spunbond nonwoven fabric as an example, the fiber filaments are in the form of atomized filament bundles. The catalytic material spraying method in the microporous fiber preparation process and the processing steps in the nonwoven fabric preparation process are the same as in Example 1.

[0056] PP masterbatch is heated to 250℃ to melt and spun into filaments; the powder spray gun is 15 cm away from the spinneret nozzle with a spacing of 10 cm, and MnCoO is sprayed onto it. x -Ⅱ Composite catalytic material. The same recovery and post-processing as in Example 1 was used to produce meltblown nonwoven fabric. MnCoO x-II composite catalytic material was prepared by a redox method. The specific operational details are as follows: First, 2.5g of potassium permanganate and 5g of cobalt nitrate hexahydrate were dissolved in 80mL of deionized water. Then, 2.3g of ammonium oxalate monohydrate was dissolved in 50mL of deionized water. The two fully dissolved solutions were then rapidly mixed together and stirred vigorously at 90℃ for 10h. The resulting MnCoO₂ was then... x The precipitate was washed repeatedly with deionized water until the washing liquid was clear, and then the solid product was dried to obtain MnCoO. x -Ⅱ composite catalytic materials.

[0057] Example 3

[0058] The microporous fiber fabric produced by the microporous fiber preparation method of the present invention is manufactured by a short fiber spunbond nonwoven fabric process, in which PS masterbatch is heated to 280°C for melt spinning; the microporous nonwoven fabric is prepared using the same process steps as in Example 1, and the subsequent finishing process includes:

[0059] The process involves web forming and hot pressing, impregnation, re-hot pressing, water washing and purification, and drying into rolls.

[0060] in,

[0061] Impregnation: The nonwoven fabric after heat pressing is impregnated in a liquid bath with a finishing agent, including the preparation of auxiliary agents and the impregnation and binding operation;

[0062] The additives include finishing agents, which are prepared by mixing composite catalytic materials with water to form a dispersion with a concentration of 30 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid, the purpose of which is to optimize the particle dispersion. The particle dispersion of the dispersion is achieved by ultrasonic treatment to make the particle size uniform, D≤50nm, and the dispersion index≤0.15.

[0063] The impregnation and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption. The impregnation solution is a dispersed granule solution with added nonionic crosslinking agent. Under alkaline pH conditions, a two-immersion and two-binding method is used, with a binding residue rate of 70-75%. The impregnation and binding time is 50 minutes, and the impregnation and binding temperature is 80℃. A second hot-pressing process follows: after impregnation and binding, excess liquid is squeezed out using rollers at a pressure of 0.4MPa, controlling the liquid retention rate at 60%-80%.

[0064] The difference between the preparation process of the microporous fibers in this embodiment and that in Example 1 is that, taking the production of short-fiber spunbond nonwoven fabric as an example, the fiber filaments are in the form of atomized filament bundles. The catalytic material spraying method in the microporous fiber preparation process and the processing steps in the nonwoven fabric preparation process are the same as in Example 1.

[0065] MnCoO spraying x -Ⅲ composite catalytic materials; MnCoOx -Ⅲ composite catalytic material was prepared by a redox method. The specific operational details are as follows: First, 2.5g of potassium permanganate and 5g of cobalt nitrate hexahydrate were dissolved in 80mL of deionized water. Then, 4.6g of ammonium oxalate monohydrate was dissolved in 50mL of deionized water. The two fully dissolved solutions were rapidly mixed together and stirred vigorously at 90℃ for 10h. Afterwards, the resulting MnCoO... x The precipitate was washed repeatedly with deionized water until the washing liquid was clear, and then the solid product was dried to obtain MnCoO. x -Ⅲ composite catalytic materials.

[0066] As other embodiments of the same type as Examples 1 to 3, the microporous fiber cloth is produced by a nonwoven fabric processing method, and is also applicable to different types of nonwoven fabrics such as needle-punched nonwoven fabrics and spunlace nonwoven fabrics as technical implementations. Loaded MnCoO x Non-woven fabrics made of composite catalytic materials can carry out formaldehyde catalytic oxidation reaction at room temperature, decompose formaldehyde, and purify indoor air.

[0067] Comparative Example 1

[0068] 2.5 g of potassium permanganate and 2.3 g of ammonium oxalate monohydrate were dissolved in 75 mL of deionized water. The two solutions were then rapidly mixed and stirred vigorously at 90 °C for 10 h. The resulting MnO2 precipitate was then washed repeatedly with deionized water until the washing liquid was clear. The solid product was then dried to obtain a single-active-component MnO2 catalytic material, named MnO2-Ⅰ.

[0069] MnCoO in Examples 1, 2, and 3 respectively x -Ⅰ、MnCoO x -Ⅱ、MnCoO x The composite catalyst (III) and the MnO2-I catalyst from Comparative Example 1 were packed into a self-made fixed-bed quartz reactor, and a mixed gas (100 ppm formaldehyde, 99.99% air) was introduced. The volume hourly space velocity (VHSV) was adjusted to 50,000, 80,000, 110,000, and 170,000 h⁻¹. -1 During the test, the temperature of the test system was maintained at a stable 25℃. Formaldehyde and carbon dioxide concentrations in the reaction exhaust gas were monitored in real time using a formaldehyde and carbon dioxide analyzer. Table 1 shows the test results after 30 minutes of reaction.

[0070] Table 1

[0071]

[0072]

[0073] Table 1 shows the MnCoO₂ of Examples 1, 2, and 3. xThe decomposition of formaldehyde at different space velocities at a catalytic concentration of 100 ppm using composite catalytic materials and the single-component MnO2 catalytic material of Comparative Example 1 (MnCoO x -Ⅰ、MnCoO x -Ⅱ、MnCoO x -Ⅲ and MnO2-Ⅰ represent the catalytic materials prepared in Examples 1, 2, 3 and Comparative Example 1, respectively;

[0074] As can be seen from Table 1, the MnCoO prepared in Examples 1-3 x The activity of the composite catalytic material is significantly better than that of the MnO2-Ⅰ catalytic material in Comparative Example 1. This means that the introduction of Co element effectively increases the oxygen vacancies in the catalytic material, thereby improving its reactivity. Furthermore, comparing the reactivity of the composite catalytic materials with the same Co and Mn content prepared in Examples 2 and 3, it is clear that the amount of ammonium oxalate as the reducing agent also affects the reactivity at the same Co and Mn content; increasing the amount of ammonium oxalate increases the activity of the composite catalytic material.

[0075] Example 4

[0076] The finishing process of this invention is applied to woven fabrics produced by weaving. In the impregnation step of the finishing process, the woven fabric is impregnated in a liquid bath with a finishing agent. The finishing agent is 100nm microporous MnCoO. x -Ⅰ The composite catalytic material is prepared with water; the woven fabric is immersed in the liquid tank for immersion and binding operation. Under alkaline conditions, a two-immersion and two-binding method is adopted, with a binding rate of 70-75%; the immersion and binding time is 40 minutes, and the immersion and binding temperature is 60℃; finally, the catalytic material is attached to the microporous fiber woven fabric to form a nanoporous structure, realizing the functional finishing of the microporous fiber woven fabric.

[0077] The preparation process of the microporous fibers in the microporous fiber woven fabric of this embodiment includes: heating PET masterbatch to 220°C for melt spinning; spraying MnCoO... x -Ⅰ Composite catalytic material; the catalytic material is MnCoO x -Ⅰ Composite catalytic material, MnCoO x -Ⅰ The composite catalytic material was prepared by a redox method. The specific operational details are as follows: First, 5g of potassium permanganate and 5g of cobalt nitrate hexahydrate were dissolved in 100mL of deionized water. Then, 5g of ammonium oxalate monohydrate was dissolved in 50mL of deionized water. The two fully dissolved solutions were then rapidly mixed together and stirred vigorously at 90℃ for 10 hours. The resulting MnCoO₂ was then... x The precipitate was washed repeatedly with deionized water until the washing liquid was clear, and then the solid product was dried to obtain MnCoO. x The composite catalytic material is named MnCoO x-Ⅰ. Microporous fiber woven fabrics loaded with finishing agents enhance the ability to catalytically oxidize formaldehyde at room temperature, decompose formaldehyde, and purify indoor air.

[0078] Example 5

[0079] Microporous nonwoven fabric (hot air nonwoven fabric) was prepared using the method of Example 1; the subsequent finishing processes included: web forming and hot pressing, impregnation, re-hot pressing, water washing and purification, and drying and rolling; wherein,

[0080] Impregnation: The nonwoven fabric after heat pressing is impregnated in a liquid bath with a finishing agent, including the preparation of auxiliary agents and the impregnation and binding operation;

[0081] The additives include a finishing agent, which is prepared by mixing zirconium titanium phosphate adsorbent with water to form a dispersion with a concentration of 20 wt%. The dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid, the purpose of which is to optimize the dispersion of particles.

[0082] The immersion and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption, using a two-immersion and two-binding method, with a binding residue rate of 70-75%; the immersion and binding time is 40 minutes, and the immersion and binding temperature is 70℃.

[0083] Re-hot pressing: After impregnation, excess liquid is squeezed out using a rolling mill roller at a pressure of 0.3MPa, controlling the liquid carry-over rate at 60%-80%;

[0084] The zirconium titanium phosphate adsorbent material was prepared using the preparation method disclosed in application number CN202410748898.4.

[0085] The microporous nonwoven fabric prepared not only includes a microporous structure loaded with catalytic materials, but also loads zirconium titanium phosphate adsorbent materials; this embodiment has the ability to carry out formaldehyde catalytic oxidation reaction at room temperature, decompose formaldehyde, and purify indoor air; it also utilizes the synergistic effect of composite materials to enhance the binding sites for bacteria and viruses and improve the utilization rate of visible light, which can better kill bacteria and viruses.

[0086] The test report for this embodiment includes:

[0087] Kanglaibu-Hot Air Nonwoven Fabric, Report No. FB250613-31, Sample Submission Date: 2025-06-13, Antiviral Inactivation Test for Human Papillomavirus Type 16 (HPV-16); Reference ISO 18184:2019 "Textiles - Determination of Antiviral Activity", Antiviral Activity Rate: 99.39%. Kanglaibu-Hot Air Nonwoven Fabric 05, Report No. SHC25040028-02, Sample Submission Date: 2025-04-03, Antiviral Inactivation Test for Human Papillomavirus Type 16 (HPV-16); Reference ISO 18184:2019 "Textiles - Determination of Antiviral Activity", Antiviral Activity Rate: 99.74%. Kanglaibu-Hot Air Nonwoven Fabric 01, Report No. SHC25040028-01, Sample Submission Date: April 3, 2025, Antiviral Inactivation Test for Human Papillomavirus Type 16 (HPV-16); Referring to ISO 18184:2019 "Textiles - Determination of Antiviral Activity", the antiviral activity rate is 99.53%. The above test results are from a test report issued by a third-party testing institution.

[0088] 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.

Claims

1. A finishing process for microporous fiber cloth, characterized in that, The microporous fiber cloth is made from fibers with a microporous structure through non-woven or weaving processes; the microporous fiber cloth is functionally finished by impregnation to enable it to carry functions.

2. The finishing process for a microporous fiber cloth according to claim 1, characterized in that: Catalytic materials are loaded onto the surface of undried fiber filaments using a spraying process to form fibers with a microporous structure. The fabrication process of microporous fibers includes: Step 1: The molten masterbatch is spun downwards through a spinneret, and the spun fibers form areas of undried fibers. Step 2: Spray the composite catalyst material onto the undried area of ​​the fiber filament, using the surface viscosity of the fiber to make the catalyst material adhere to the surface of the fiber filament; at a distance of 15-20 cm from the spinneret, use a powder spraying device to vertically spray the composite catalyst material onto the undried area; the powder spraying device is located on the side of the fiber filament, the distance between the powder spraying guns is 10 cm, the height of the nozzle from the spinneret is 10-15 cm, and the air pressure is 0.4-0.6 Pa.

3. The finishing process for a microporous fiber cloth according to claim 1 or 2, characterized in that: The microporous fiber cloth is treated with additives using an impregnation method. The fiber cloth is impregnated in a liquid bath with additives, which includes additive preparation and impregnation operations.

4. The finishing process for a microporous fiber cloth according to claim 3, characterized in that: The additives include finishing agents, which are prepared by mixing composite catalytic materials with water to form a dispersion with a concentration of 10-30 wt%; the dispersion is then subjected to ultrasonic treatment to form a dispersed particulate liquid.

5. The finishing process for a microporous fiber cloth according to claim 4, characterized in that: The impregnation and binding operation involves immersing the fiber cloth in a liquid bath for impregnation and adsorption. The impregnation liquid is a dispersed particulate liquid with added nonionic crosslinking agent. Under alkaline pH conditions, a two-immersion and two-binding method is adopted, with a binding residue rate of 70-75%. The impregnation and binding time is 30-50 minutes, and the impregnation and binding temperature is 60-80℃.

6. The finishing process for a microporous fiber cloth according to claim 1 or 2, characterized in that: The microporous fiber cloth is treated with functional additives by impregnation. The fiber cloth is impregnated in a liquid bath with additives, including additive preparation and impregnation operations. The additives include finishing agents, which are prepared by mixing zirconium titanium phosphate adsorbent with water to form a dispersion with a concentration of 10-30 wt%. The dispersion is then ultrasonically treated to form a dispersed particulate liquid.

7. The finishing process for a microporous fiber cloth according to claim 2, characterized in that: The catalyst material is MnCoO x The composite catalytic material is made of manganese salt, cobalt salt, oxalate, and deionized water into nanospheres; the MnCoO x The composite catalytic material is produced by optimizing the coupling of manganese-cobalt dual centers, first obtaining a manganese-cobalt precursor salt solution, then obtaining a manganese-cobalt salt precipitate, and finally separating it by centrifugation, taking out the solid product and drying it to make nano-spherical particles.

Images