A far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid and its preparation and application

Abstract

The present invention belongs to the technical field of fiber materials and functional additives, and discloses a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid, as well as its preparation and application. The preparation method of the finishing liquid is as follows: reacting allyl epoxy-terminated polyether with hydrogenated silicone oil, then adding an aminosilane coupling agent to react, to obtain a modified polysiloxane solution containing both epoxy groups and coupling groups; adding a functional powder material containing far-infrared ceramic powder, antiviral Chinese medicine powder, and inorganic formaldehyde-removing and deodorizing powder to the modified polysiloxane solution, stirring and dispersing the mixture uniformly, then adding an aqueous solution containing an emulsifier, stirring and emulsifying the mixture under heating and negative pressure conditions, and simultaneously evaporating ethanol to a mass percentage of less than 5%, to obtain the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid. The finishing liquid of the present invention can simultaneously achieve the softening finishing of fiber materials and the health care functions of far infrared, negative ion, antiviral, formaldehyde-removing, and antibacterial finishing.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber materials and functional additives, and particularly relates to a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid and its preparation and application. Background Art

[0002] With the advancement of textile technology and the quality of life, single-function fiber fabrics can no longer meet people's daily needs. Multifunctionality is an inevitable trend in the development of fiber fabrics. The development of functional fibers is a symbol of the progress of modern fiber science. Functional fibers are new fibers that possess specific functions in addition to the physical and mechanical properties of general fibers. For example, fibers with health and wellness functions, such as far-infrared, negative ion, formaldehyde removal and deodorization, antibacterial, and antiviral properties, are attracting attention, their market prospects are expanding, and corresponding research is increasing.

[0003] At present, the preparation methods of multifunctional fiber materials mainly include blending and finishing methods. The blending method generally involves mixing materials with far-infrared, negative ion, formaldehyde removal and deodorization, antibacterial, antiviral and other functions with a fiber matrix before fiber formation, and then spinning them into shape. It has the advantages of long-lasting efficacy and washability. However, it has high requirements for blending technology and high costs, and is mainly used for high-end fabrics. For example, in our previous patents CN116288768A and CN202310534271.4, a method for preparing far-infrared negative ion antibacterial and anti-mite health-care multifunctional fibers and formaldehyde removal, deodorization, antibacterial, anti-mildew and antiviral multifunctional fiber cotton by blending is disclosed.

[0004] Post-finishing methods primarily involve post-treating preformed fiber materials with a finishing agent containing functional ingredients to impart corresponding functionalities. Post-finishing methods have minimal impact on the fiber matrix, are simple to process, and are relatively low-cost, offering excellent cost-effectiveness for products such as mattresses and cushions that are infrequently washed. For example, patent CN101525836A discloses a method for preparing a nano-antibacterial negative ion finishing agent. Negative ion-generating materials such as tourmaline, zeolite, and medical stone are premixed with nano-oxide precursors, and the finishing agent suspension is prepared using ultrasonic dispersion technology to obtain the nano-antibacterial negative ion finishing agent. Using an adhesive and a softener, natural and synthetic fibers are subjected to negative ion finishing through a padding, baking, and curing process. The resulting fabric possesses excellent negative ion functionality and antibacterial properties. Patent CN109537290B discloses a far-infrared finishing agent for textiles, comprising water-based polyurethane, epoxy resin, ceramic powder, ZnO, TiO2, sodium polyacrylate, polyvinyl alcohol Z-200, isocyanate, N-methylol acrylamide, and deionized water. This invention utilizes a specific combination of ceramic powder, ZnO, and TiO2 to create a high-performance, highly stable finish that imparts excellent far-infrared health benefits, UV protection, sterilization, deodorization, and air purification properties to textiles. Patent CN111411510B discloses an antibacterial, anti-mite, and antiviral finish comprising a metal ion-doped photocatalyst, a plant extract, chitosan, and a dispersant. The antibacterial, antiviral finish is applied to the plush fabric during the post-finishing process. The synergistic combination of metal ions, photocatalyst, plant extract, and chitosan in the antibacterial, anti-mite, and antiviral finish enhances the plush fabric's antibacterial efficacy against bacteria such as Escherichia coli, Staphylococcus aureus, and Candida albicans.

[0005] While the aforementioned existing technologies all achieve functional finishing of fiber materials, the inorganic functional materials and / or organic resin adhesives attached to the fiber surface can reduce the fiber's softness, breathability, and other properties. To address this issue, a second finishing step with a softening agent is required. This not only increases the process flow and costs, but also reduces the effectiveness of the initial functional finishing. Integrating functional finishing and softening into the same finishing process would significantly improve the finishing effect and efficiency.

[0006] However, existing fiber softening agents commonly use silicone-based softening agents, such as amino silicone oil softening agents. These generally suffer from poor water dispersibility and weak interaction with inorganic functional materials, adversely affecting the dispersion and adhesion of inorganic functional materials on the fiber surface.

[0007] Patent CN116239778A discloses a softening finishing agent that improves fabric soap resistance. The agent is composed of an epoxy-terminated polyether and a segmented polyether amino silicone oil emulsion with a solids content of 30-40% in a mass ratio of (0.5-1):30. One end of the epoxy group chemically bonds with the amino or hydroxyl groups on the segmented polyether amino silicone oil, forming a crosslinked structure. The other end then bonds with the hydroxyl groups on the fiber, increasing the silicone oil-fiber bond and improving soap fastness. However, in practice, the target and degree of epoxy crosslinking are difficult to control, requiring high control of post-finishing process conditions. Patent CN109988313A discloses a softening finishing agent of a polyether amino silicone oil copolymer, which is prepared by reacting epoxy-terminated polysiloxane, polyether amine, and a cross-linking monomer. The cross-linking monomer is a multifunctional octaamino cage silsesquioxane. Therefore, the obtained polyether amino silicone oil copolymer has a three-dimensional cross-linked structure. The softening finishing agent prepared from the above polyether amino silicone oil copolymer can give the fabric a thick, crisp, and smooth feel.

[0008] Although the above-mentioned softening finishing agents can achieve good softening finishing effects, they cannot achieve good dispersion and adhesion of inorganic functional materials on the fiber surface. Summary of the Invention

[0009] In view of the shortcomings and deficiencies of the above-mentioned prior art, the primary purpose of the present invention is to provide a method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid. The finishing liquid of the present invention can simultaneously achieve the softening and health care function finishing of fiber materials.

[0010] Another object of the present invention is to provide a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid prepared by the above method.

[0011] Another object of the present invention is to provide the application of the above-mentioned far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid in the post-finishing of fibers, fiber blocks and fiber cloths.

[0012] The purpose of the present invention is achieved through the following technical solutions:

[0013] A method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid comprises the following preparation steps:

[0014] (1) adding allyl epoxy-terminated polyether and hydrogenated silicone oil to anhydrous ethanol and stirring to dissolve uniformly, heating to 60-90° C. under nitrogen protection, adding chloroplatinic acid catalyst and stirring to react for 1-6 hours, then cooling to 10-60° C., adding aminosilane coupling agent and reacting to obtain a modified polysiloxane solution containing both epoxy groups and coupling groups;

[0015] (2) adding a functional powder material comprising far-infrared ceramic powder, antiviral Chinese medicine powder and inorganic formaldehyde removal and deodorizing powder to the modified polysiloxane solution of step (1) and stirring and dispersing the mixture uniformly, then adding an aqueous solution containing an emulsifier, stirring and emulsifying the mixture under heating and negative pressure conditions, and simultaneously evaporating ethanol to a mass percentage of less than 5%, thereby obtaining the far-infrared antiviral formaldehyde removal multifunctional fiber cotton finishing liquid.

[0016] Furthermore, the molecular formula of the allyl epoxy terminated polyether in step (1) is as follows:

[0017] wherein a is an integer from 1 to 40, and b is an integer from 0 to 20.

[0018] Furthermore, the hydrogen-containing silicone oil in step (1) refers to a hydrogen-containing silicone oil having a viscosity of 20 to 100 mPa·s at 25° C. and a hydrogen content (m / m) of 0.2% to 1.5%.

[0019] Furthermore, the amount of the allyl epoxy-terminated polyether added in step (1) is 0.1 to 0.9 times the amount of active hydrogen (Si-H) groups contained in the hydrogen-containing silicone oil. Too low an amount of the allyl epoxy-terminated polyether results in poor emulsification performance, while too high an amount of the allyl epoxy-terminated polyether results in residual raw materials, unstable product quality, and poor softening finishing effects.

[0020] Furthermore, the aminosilane coupling agent in step (1) is aminopropyltrimethoxysilane or aminopropyltriethoxysilane; the amount of the aminosilane coupling agent added is 0.2 to 0.6 times the amount of the allyl epoxy-terminated polyether substance. In the present invention, the amount of the aminosilane coupling agent added relative to the allyl epoxy-terminated polyether has a significant effect on the performance of the finishing liquid of the present invention. Too low an amount of the aminosilane coupling agent added will result in a low content of coupling groups in the modified polysiloxane structure that binds to the functional powder material, and the binding force of the functional powder material will be weak, resulting in reduced durability and water resistance of functional finishing effects such as far-infrared antiviral and formaldehyde removal. Too high an amount of the aminosilane coupling agent added will result in all epoxy groups undergoing ring-opening reactions, and its binding force with the fiber will weaken during subsequent applications, resulting in reduced durability and water resistance of functional finishing effects such as soft finishing effects and far-infrared antiviral and formaldehyde removal.

[0021] Furthermore, the functional powder material in step (2) further comprises at least one of negative ion powder, antibacterial, anti-mite and anti-mildew powder, and the like; and the particle size of the functional powder material is 1 to 5 μm.

[0022] Further preferably, as an example, the antiviral Chinese medicine powder includes Chinese medicine powder of at least one ingredient selected from Radix Isatidis, Coral Grass, Mint, Bupleurum, Honeysuckle, Wild Chrysanthemum, Taraxacum, Houttuynia Cordata, Artemisia annua, Licorice, Rhizoma Cyrthospermi, and Patchouli; the inorganic formaldehyde removal and deodorizing powder includes at least one of titanium dioxide powder, bamboo charcoal powder, activated carbon powder, photocatalyst, and diatomaceous earth powder; the negative ion powder is tourmaline (tourmaline) negative ion powder; the antibacterial, anti-mite, and anti-mildew powder includes at least one of silver oxide powder, zinc oxide powder, copper oxide powder, graphene powder, aluminum oxide powder, magnesium oxide powder, calcium oxide powder, manganese oxide powder, iron oxide powder, and ceramic powder containing silver, copper or zinc ions.

[0023] Furthermore, the amount of the functional powder material added in step (2) is 1% to 25% of the solid matter in the modified polysiloxane solution.

[0024] Furthermore, at least one of a hydrophilic additive and an antistatic agent is added to the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid in step (2). The hydrophilic additive is preferably a polyether-modified silicone oil; and the antistatic agent is preferably a cationic antistatic agent, such as octadecyltrimethylammonium chloride.

[0025] Furthermore, the emulsifier in step (2) is fatty alcohol polyoxyethylene ether (AEO), and the amount of the emulsifier added is 0.5% to 4% of the solid matter in the modified polysiloxane solution.

[0026] Furthermore, the amount of water added in step (2) is such that the solid content (w / w) of the final far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid is 10% to 30%.

[0027] A far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid is prepared by the above method.

[0028] The application of the above-mentioned far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid in the finishing of fibers, fiber blocks, and fiber cloths is characterized in that the application steps are as follows:

[0029] The fiber or fiber cloth is added to the above-mentioned far-infrared antiviral formaldehyde removal multifunctional fiber cotton finishing liquid and soaked for 15 to 60 minutes, using a dipping and padding process, and then dried and shaped at a temperature of 150 to 180° C. to obtain the far-infrared antiviral formaldehyde removal multifunctional fiber or fiber cloth;

[0030] Alternatively, the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid is sprayed on the surface of the fiber cotton block, and then dried and shaped at a temperature of 150-180° C. to obtain the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The finishing liquid of the present invention is obtained by mixing a modified polysiloxane solution containing both epoxy groups and coupling groups with a functional powder material. The long-chain polyether coupling groups contained in the modified polysiloxane solution can undergo a coupling reaction with the surface of the functional powder material. The coupling effect is better than that of a short-chain silane coupling agent, and the finishing liquid can significantly enhance the dispersion effect of the functional powder material and the binding force between the polysiloxane softening finishing agent and the functional powder material.

[0033] (2) The finishing liquid of the present invention contains chemically grafted epoxy groups, which can react with the fibers during the subsequent high-temperature finishing process, thereby significantly improving the binding force between the polysiloxane softening finishing agent and the functional powder material and the fibers, thereby simultaneously improving the durability and water resistance of the softening finishing effect and the functional finishing effect. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto.

[0035] Example 1

[0036] The preparation method of a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid and a far-infrared antiviral and formaldehyde-removing multifunctional polyester fiber cloth of this embodiment includes the following preparation steps:

[0037] (1) 150 g of allyl epoxy-terminated polyether with an average molecular weight of 500 and 100 g of hydrogenated silicone oil (viscosity of 80 mPa·s at 25°C and hydrogen content of 0.65%) were added to 750 g of anhydrous ethanol and stirred to dissolve evenly. The temperature was raised to 75°C under nitrogen protection, and chloroplatinic acid catalyst was added and stirred and refluxed for 3 h. After the alkenyl reaction was detected to be complete, the temperature was lowered to 40°C, and aminopropyltriethoxysilane was added and the stirring reaction was continued for 2 h to obtain a modified polysiloxane solution containing both epoxy groups and coupling groups.

[0038] (2) 10 g of far-infrared ceramic powder with a particle size of 1 to 5 μm, 5 g of antiviral Chinese medicine powder (dry powder of extracts of Radix Isatidis, Radix Bupleuri, Flos Lonicerae, and Flos Chrysanthemi Indici) and 10 g of inorganic formaldehyde-removing and deodorizing powder (activated carbon powder, photocatalyst powder) are added to the modified polysiloxane solution of step (1) and stirred and dispersed evenly, and then 1 L of an aqueous solution containing 0.5% wt AEO emulsifier is added, the temperature is raised to 60 to 70° C., and the solution is stirred and emulsified under negative pressure, and ethanol is evaporated to a mass percentage of less than 5% to obtain a far-infrared antiviral formaldehyde-removing multifunctional fiber cotton finishing liquid.

[0039] (3) Add the polyester fiber cloth to the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid of step (2) and soak it for 30 minutes, adopt a one-dip and one-roll process, and then dry and shape it at a temperature of 160-170° C. for 2 minutes to obtain the far-infrared antiviral and formaldehyde-removing multifunctional polyester fiber cloth.

[0040] In order to study the effect of the addition amount of aminosilane coupling agent on the performance of the finishing agent, the addition amount of aminopropyltriethoxysilane was adjusted to 0, 0.1 times (6.6 g), 0.2 times (13.2 g), 0.4 times (26.4 g), 0.6 times (39.6 g) and 0.8 times (52.8 g) of the amount of allyl epoxy-terminated polyether substance respectively. The epoxy value of the modified polysiloxane obtained and the softening finishing effect of the finishing liquid obtained were tested respectively (softness and fluffiness (evaluated by hand touch method, the highest score for the feel evaluation is 5 points and the lowest score is 0 points, five people evaluate at the same time, and the average score is taken), stiffness (tested with reference to ZBW04003-87 "Fabric Stiffness Test Method Inclined Cantilever Method"; the smaller the stiffness, the better the softness of the fabric)) and functional finishing effect (far infrared performance test is based on CAS115-2005, health functional textiles; antiviral performance testing requirements and basis are ISO18184-2014, the test virus is coronavirus Hcov-229E; formaldehyde removal performance test refers to GB / T33610.2-2017, and the test gas is formaldehyde). The durability and washability are tested after washing 5 times according to GB / T8629-2001 "Household Washing and Drying Procedure for Textile Testing". The test results are shown in Table 1 below.

[0041] Table 1

[0042]

[0043] The results in Table 1 show that the epoxy value of the modified polysiloxane exhibits a significant downward trend with increasing aminosilane coupling agent addition. The resulting finish maintains excellent softening properties and long-lasting washability up to 0.6 times the amount added. Without the addition of an aminosilane coupling agent, the resulting finish exhibits the best softening properties, but the long-lasting washability of the corresponding far-infrared, antiviral, and formaldehyde-removing health and wellness functional finishes is significantly insufficient. This is due to insufficient bonding between the health and wellness functional material, the finish agent, and the fiber material. With increasing aminosilane coupling agent addition, the health and wellness functional finish and long-lasting washability of the resulting finish initially increase and then decrease. When the aminosilane coupling agent is added at an amount of 0.2 to 0.6 times the amount of the allyl epoxy-terminated polyether, the resulting finish maintains excellent health and wellness functional finish and long-lasting washability. When the amount of aminosilane coupling agent added reaches 0.8 times, the corresponding soft finishing effect and long-lasting water resistance, as well as the long-lasting water resistance of the health care functional finishing effect are significantly reduced. The reason is that the binding force between the modified polysiloxane and the fiber is reduced, which also leads to a decrease in the binding force between the health care functional material and the fiber.

[0044] Example 2

[0045] The preparation method of a far-infrared negative ion antiviral, formaldehyde-removing, and antibacterial multifunctional fiber cotton finishing liquid and a far-infrared negative ion antiviral, formaldehyde-removing, and antibacterial multifunctional polyester fiber cotton of the present embodiment includes the following preparation steps:

[0046] (1) 100 g of an allyl epoxy-terminated polyether with an average molecular weight of 500 and 100 g of hydrogenated silicone oil (viscosity of 100 mPa·s at 25°C, hydrogen content of 0.52%) were added to 800 g of anhydrous ethanol and stirred to dissolve uniformly. The mixture was heated to 75°C under nitrogen protection, and chloroplatinic acid catalyst was added and stirred under reflux for 4 h. The reaction of the alkenyl groups was checked to be complete. The mixture was then cooled to 40°C, and 15 g of aminopropyltrimethoxysilane was added and stirred for 2 h to obtain a modified polysiloxane solution containing both epoxy groups and coupling groups. The epoxy value of the modified polysiloxane was 0.05.

[0047] (2) 5 g of far-infrared ceramic powder with a particle size of 1 to 5 μm, 5 g of tourmaline negative ion powder, 5 g of antiviral Chinese medicine powder (dried powder of extracts of isatis root, bupleurum root, honeysuckle and wild chrysanthemum), 5 g of inorganic formaldehyde removal and deodorization powder (activated carbon powder, photocatalyst powder) and 5 g of nano zinc oxide antibacterial powder are added to the modified polysiloxane solution of step (1) and stirred and dispersed evenly, and then 1 L of an aqueous solution containing 0.5% wt AEO emulsifier is added, the temperature is raised to 60 to 70° C., and the solution is stirred and emulsified under negative pressure. At the same time, ethanol is evaporated to a mass percentage of less than 5%, thereby obtaining a far-infrared negative ion antiviral formaldehyde removal and antibacterial multifunctional fiber cotton finishing liquid.

[0048] (3) The far-infrared negative ion antiviral, formaldehyde-removing, and antibacterial multifunctional fiber cotton finishing liquid of step (2) is sprayed on the surface of the polyester fiber cotton block, and then dried and shaped at a temperature of 160-170° C. for 2 minutes to obtain the far-infrared negative ion antiviral, formaldehyde-removing, and antibacterial multifunctional polyester fiber cotton.

[0049] Comparative Example 1

[0050] In this comparative example, a softening finish consisting of an epoxy-terminated polyether and a segmented polyether amino silicone oil emulsion as described in CN116239778A was used instead of the modified polysiloxane solution in Example 2. The epoxy value and solids content of the softening finish were adjusted to the same level as in Example 2 by adjusting the amount of epoxy-terminated polyether and dilution water. An equal amount of health-care functional particles was added to the softening finish and mixed thoroughly. The polyester fiber was then post-finished under the same process conditions.

[0051] Comparative Example 2

[0052] Compared with Example 2, this comparative example uses a modified polysiloxane solution containing both epoxy groups and short-chain coupling groups to prepare a finishing liquid, including the following preparation steps:

[0053] (1) 100 g of an allyl epoxy-terminated polyether with an average molecular weight of 500, 15 g of vinyl trimethoxysilane, and 100 g of hydrogenated silicone oil (viscosity of 100 mPa·s at 25°C, hydrogen content of 0.52%) were added to 800 g of anhydrous ethanol and stirred to dissolve uniformly. The mixture was heated to 75°C under nitrogen protection, and chloroplatinic acid catalyst was added and stirred under reflux for 4 h. The alkenyl reaction was detected to be complete, thereby obtaining a modified polysiloxane solution containing both epoxy groups and short-chain coupling groups. The epoxy value of the modified polysiloxane was detected to be 0.09.

[0054] Steps (2) and (3) are the same as in Example 2.

[0055] The performance of the far-infrared negative ion antiviral, formaldehyde-removing, and antibacterial multifunctional polyester fiber cotton obtained in Example 2 and Comparative Examples 1 and 2 was tested using the same testing method as in Example 1. Additionally, negative ion production was measured using a relative standard atmospheric ion concentration measurement device, and the antibacterial rate was measured using the GB / T 20944.3-2008 oscillation method using Escherichia coli. The test results are shown in Table 2 below.

[0056] Table 2

[0057]

[0058]

[0059] As can be seen from the results in Table 2, Comparative Example 1 uses a method of blending epoxy-terminated polyether and block polyether amino silicone oil emulsion. The resulting finishing agent has a good initial softening finishing effect, but slightly poor long-term water washing resistance. At the same time, its health care function finishing effect and long-term water washing resistance are both inferior to those of the present invention. The reason is that the degree of directional crosslinking between the epoxy groups and the fibers in the physical blend is low, and the binding force is slightly weaker. At the same time, it does not contain a binding group for the health care functional material, resulting in a significant reduction in the health care function finishing effect. Comparative Example 2 uses a modified polysiloxane containing both epoxy groups and short-chain coupling groups as a softening finishing component. Because its epoxy value is higher, the softening finishing effect has better long-term water washing resistance. However, its health care function finishing effect is significantly lower than that of the present invention. The reason is that the coupling group containing the long-chain polyether in the present invention can better bind to the health care functional material than the short-chain coupling group in Comparative Example 2, improving the dispersion effect of the health care functional material in the finishing liquid and increasing the binding force between the fiber material.

[0060] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid, characterized in that: The method comprises the following preparation steps: (1) Add allyl epoxy-terminated polyether and hydrogenated silicone oil into anhydrous ethanol and stir to dissolve evenly. Heat to 60-90°C under nitrogen protection, add chloroplatinic acid catalyst and stir to react for 1-6 hours, then cool to 10-60°C, add aminosilane coupling agent and react to obtain a modified polysiloxane solution containing both epoxy groups and coupling groups. (2) adding a functional powder material comprising far-infrared ceramic powder, antiviral Chinese medicine powder and inorganic formaldehyde removal and deodorizing powder to the modified polysiloxane solution of step (1) and stirring and dispersing the mixture uniformly; then adding an aqueous solution containing an emulsifier, stirring and emulsifying the mixture under heating and negative pressure conditions, and simultaneously evaporating ethanol to a mass percentage of less than 5%, thereby obtaining the far-infrared antiviral formaldehyde removal multifunctional fiber cotton finishing liquid; The aminosilane coupling agent in step (1) is aminopropyltrimethoxysilane or aminopropyltriethoxysilane; the amount of the aminosilane coupling agent added is 0.2 to 0.6 times the amount of the allyl epoxy-terminated polyether substance.

2. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 1, characterized in that: The molecular formula of the allyl epoxy terminated polyether in step (1) is as follows: , where a is an integer from 1 to 40, and b is an integer from 0 to 20; The hydrogen-containing silicone oil refers to a hydrogen-containing silicone oil having a viscosity of 20 to 100 mPa·s at 25° C. and a hydrogen content of 0.2% to 1.5%.

3. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 2, characterized in that: The amount of the allyl epoxy-terminated polyether added is 0.1 to 0.9 times the amount of the active hydrogen group substance contained in the hydrogen-containing silicone oil.

4. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 1, characterized in that: The functional powder material in step (2) further comprises at least one of negative ion powder and antibacterial, anti-mite and anti-mildew powder; the particle size of the functional powder material is 1-5 μm; the antiviral Chinese medicine powder comprises at least one of the following components: Radix Isatidis, Coral Grass, Mint, Bupleurum, Honeysuckle, Wild Chrysanthemum, Taraxacum, Houttuynia Cordata, Artemisia annua, Licorice, Rhizoma Cyrthospermi, and Patchouli; the inorganic formaldehyde removal and deodorizing powder comprises at least one of titanium dioxide powder, bamboo charcoal powder, activated carbon powder, photocatalyst, and diatomaceous earth powder; the negative ion powder is tourmaline negative ion powder; the antibacterial, anti-mite and anti-mildew powder comprises at least one of silver oxide powder, zinc oxide powder, copper oxide powder, graphene powder, aluminum oxide powder, magnesium oxide powder, calcium oxide powder, manganese oxide powder, iron oxide powder, and ceramic powder containing silver, copper or zinc ions.

5. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 1, characterized in that: The amount of the functional powder material added in step (2) is 1% to 25% of the solid matter in the modified polysiloxane solution.

6. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 1, characterized in that: In step (2), at least one of a hydrophilic additive and an antistatic agent is further added to the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid; the hydrophilic additive is polyether-modified silicone oil; and the antistatic agent is a cationic antistatic agent.

7. The method for preparing a far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 1, characterized in that: The emulsifier in step (2) is fatty alcohol polyoxyethylene ether, and the amount of emulsifier added is 0.5% to 4% of the solid matter in the modified polysiloxane solution; the amount of water added is such that the solid content of the final far-infrared antiviral formaldehyde-removing multifunctional fiber cotton finishing liquid is 10% to 30%.

8. A far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid, characterized in that: It is prepared by the method according to any one of claims 1 to 7.

9. Use of the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid according to claim 8 in the finishing of fibers and fiber fabrics, characterized in that: The application steps are as follows: The fiber or fiber cloth is added to the far-infrared antiviral and formaldehyde-removing multifunctional fiber cotton finishing liquid described in claim 8 and soaked for 15 to 60 minutes, using a dipping and padding process, and then dried and shaped at a temperature of 150 to 180°C to obtain the far-infrared antiviral and formaldehyde-removing multifunctional fiber or fiber cloth.

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