A bio-based antibacterial and antiviral material resistant to washing and preparation method thereof

Abstract

The present invention provides a bio-based antibacterial and antiviral material that is resistant to washing and a preparation method thereof. The present invention firstly compounds three kinds of natural, inorganic and organic antibacterial and antiviral nanopowders, and then uses the compounded nanopowders as additives to prepare bio-based antibacterial and antiviral hot-melt filaments; then, when the base cloth is woven, the bio-based antibacterial and antiviral hot-melt filaments are introduced into the inner layer of the fabric; finally, the base cloth and the nano waterproof breathable membrane are surface bonded by means of a hot pressing process to obtain a bio-based antibacterial and antiviral material that is resistant to washing for more than 100 times, can actively and multiplexly kill bacteria and viruses in three dimensions, has intelligent temperature regulation and comfort, is easy to recycle, has a green and environmentally friendly process, a short process, and is easy to industrialize. It solves the defects of existing antibacterial and antiviral materials that rely on physical barriers, have weak areas in protective performance, are easy to delaminate and are not resistant to washing, and can be used to develop a series of antibacterial and antiviral protective equipment to provide safe and effective protection for operators.

Description

Technical Field

[0001] The invention belongs to the field of preparation of bio-based functional materials, and relates to a bio-based disinfection-resistant antibacterial and antiviral material and a preparation method thereof. Background Art

[0002] Medical protective clothing refers to protective clothing used by medical personnel and people entering specific medical and health areas. Its function is to block viruses, bacteria, harmful particles, solutions and other substances, and protect medical staff from infection during diagnosis and treatment. Although my country's medical protective clothing started late, it has shown a rapid development trend as a whole. GB 19082-2009 "Technical Requirements for Disposable Medical Protective Clothing" stipulates that medical protective clothing must have protective, comfortable and physical and mechanical properties, among which protective properties include microbial and particle barrier ability and water resistance, comfort includes breathability, fabric thickness, fit, and physical and mechanical properties include tensile breaking strength, bursting strength and seam strength.

[0003] At present, medical protective clothing is divided into two categories: disposable and reusable. Disposable medical protective materials have poor mechanical properties, air permeability and moisture permeability, and their wearing comfort and service life need to be improved. In addition, the arbitrary abandonment of disposable protective materials has caused resource waste and severe shortage of protective fabrics. Compared with disposable protective clothing, reusable medical protective materials have low single-use costs, can save resources, have better comprehensive performance and better comfort. The development of reusable medical protective materials has received more extensive attention.

[0004] Currently, there are three main ways to develop reusable medical protective materials.

[0005] The first type is prepared by laminating one or more layers of base fabric (woven fabric, non-woven fabric, etc.) and a waterproof and breathable film (polytetrafluoroethylene microporous film, etc.) through adhesives, hot melt, etc., mainly using the waterproof and breathable film to physically block bacteria, viruses and particles.

[0006] CN 111070825 B provides a reusable polytetrafluoroethylene microporous film composite mask material, specifically, firstly spraying an acrylic adhesive on both sides of a polytetrafluoroethylene microporous film and drying to obtain a spray glue dry film, and then compounding the spray glue dry film with a polypropylene spunbond nonwoven fabric to obtain a composite film; and laminating one side of the composite film with a woven fabric or a polypropylene spunbond nonwoven fabric or a polyester spunlace fabric, thereby developing a reusable polytetrafluoroethylene microporous film composite mask material. The protective effect of the material meets the requirements specified in GB / T 32610-2016, and the material can still be used after being disinfected with medical alcohol for 5 times.

[0007] CN 111184279 B invented a reusable protective clothing. The protective material is made of three layers of materials composited by rolling polyester glue, wherein the outer layer is a flame-retardant polyester filament fiber textile material, the middle layer is a polyurethane (PU) antibacterial film, and the inner layer is a conductive silk fiber textile material. The water permeability of the protective material reaches more than 1100 cm. After repeated use 100 times, its water permeability is more than 40 cm, which is still higher than the water permeability of a single-use protective clothing.

[0008] CN 111572106 A discloses a highly permeable and highly barrier reusable medical protective clothing fabric and a preparation method thereof. Specifically, the outer antistatic polyester pongee base fabric and the PU microporous film are firstly compounded by a PUR hot melt compounding machine to make a two-layer composite fabric semi-finished product, and then the two-layer composite fabric and the third layer of Tricodile warp knitted fabric are hot melt compounded for a second time with the aid of glue to make a sandwich structure composite fabric.

[0009] CN 111791546 A discloses a reusable protective clothing material, which is composed of at least two layers of non-woven fabric material and a PET porous ion film, which is compounded by a hot melt adhesive compounding machine in a dispensing manner. The physical barrier function of the porous ion film is adopted, the material can be reused, the material cost is saved, and the pollution to the environment is reduced.

[0010] CN 111972733 A provides a reusable anti-virus protective clothing, the protective clothing material from the outside to the inside sequentially comprises an antistatic fiber layer, an antibacterial breathable film middle layer, a non-woven fabric layer, a deodorizing layer and a moisture absorption and perspiration fiber layer, thereby improving the comfort and safety of the user.

[0011] CN 113524838 A relates to a reusable breathable, moisture-permeable and antistatic medical protective fabric. The fabric body is divided into three layers, which are the first base fabric, the middle three-component film and the third base fabric from top to bottom. The materials of the first base fabric and the third base fabric are 50D liquid-dyed polyester low-elastic yarn plus 20D black conductive yarn warp knitting, and the middle three-component film is composed of polyurethane film and polytetrafluoroethylene film. The three layers of materials are hot-pressed and connected by hot-melt glue. It can be reused, is not easy to produce deflocculation and fading during use, has air permeability, moisture permeability, resistance to synthetic blood penetration, water permeability and anti-static functions, and can reduce costs and pollution.

[0012] CN 115629195 A discloses a method for preparing a reusable medical protective clothing fabric, which uses a woven antistatic fabric as the outer layer fabric, a pure polyester woven filament fabric as the inner layer fabric, and a polyimide nanofiber membrane as the core barrier layer, and is prepared by an offline double-sided composite process. The fabric has better barrier properties against pathogens, body fluids, and blood, is reusable, has good mechanical properties, and has the advantages of easy emergency conversion, long storage time, and low single-use cost.

[0013] CN116409036A provides a reusable nanofiber laminated composite medical protective clothing fabric. The protective clothing fabric is composed of a woven outer layer fabric containing conductive fibers, an electrostatically spun pleated structure super-hydrophobic nanofiber membrane (the hot melt adhesive mesh is one or more of polyamide, polyethersulfone, thermoplastic polyurethane or ethylene-vinyl acetate copolymer), and a woven inner layer fabric with a unidirectional moisture conduction function. The layers of fabric are bonded and laminated by hot melt adhesive mesh bonding and lamination technology. After more than 20 disinfection and sterilization processes, the appearance of the fabric does not change significantly, and the hydrostatic pressure resistance, resistance to synthetic blood penetration, and moisture permeability indicators can still meet GB 19082-2009 "Technical Requirements for Disposable Medical Protective Clothing".

[0014] CN 212920715 U provides a reusable PTFE protective mask fabric, which comprises a composite polyester surface fabric layer, a PTFE microporous membrane layer, and a lining fabric layer in sequence; it is made by ultrasonic cutting and local hot melting of the edge of the surface fabric. After being sterilized by high-temperature steaming or alcohol soaking, the filtration efficiency is high and it can be reused, so that the durability of the protective mask is greatly improved.

[0015] The second method is to perform antibacterial impregnation or coating on the base fabric, and then laminate one or more layers of base fabric (woven fabric, non-woven fabric, etc.) with antibacterial function and a waterproof and breathable film (polytetrafluoroethylene microporous film, etc.) with the help of adhesives, hot melt, etc.

[0016] CN 111109726 A discloses a reusable sterile medical protective clothing, wherein the protective clothing materials are, from outside to inside, a woven outer layer fabric containing antistatic fibers, an antibacterial breathable film middle layer, and a woven inner layer fabric woven from moisture wicking fibers. The breathable film middle layer and the woven inner layer fabric are laminated together using a PU adhesive by a point-coating method using a lamination technology, and an air layer is between the woven outer layer fabric and the breathable film. The protective clothing material has the advantages of good antibacterial, antiviral, and liquid resistance, and is washable and reusable, has the characteristics of saving resources and reducing pollution, has a long service life, and can be reused more than 50 times after washing and disinfection.

[0017] CN 112189918 A provides a reusable bactericidal and antiviral protective clothing, which is composed of two layers of materials, the surface layer is active chlorine-modified high-density nylon, and the inner layer is a polyurethane nanofiber membrane. The nylon fabric modified by active chlorine in the protective clothing has fast and efficient bactericidal and antiviral performance, and the inner layer has better elasticity, softness and moisture permeability than the traditional Gore-Tex membrane.

[0018] CN 112359609 A discloses a reusable nano antibacterial biochemical protective fabric. By applying a nano antibacterial special coating to various textiles and non-woven fabrics, the coated product has special functions such as antibacterial, antiviral, anti-ultraviolet, antistatic, far infrared, waterproof, anti-fouling, moisture permeability, and breathable, and can be safely reused for at least 50 times.

[0019] The third method is to start with fiber raw materials to prepare antibacterial woven fabrics, and then laminate one or more layers of base fabrics with antibacterial function and waterproof and breathable films through adhesives, hot melt and other methods.

[0020] CN 113208200 A discloses a breathable, reusable antibacterial protective clothing. The fabric of the protective clothing includes an outer layer, an intermediate layer, and an inner layer from the outside to the inside. The inner layer is an antistatic, flame-retardant PP non-woven fabric; the intermediate layer is a protective filter layer, which is composed of a nanofiber (polyvinylidene fluoride) film layer and a bonding layer (the bonding layer is a polyolefin material, which is sprayed on the surface of the inner layer to play a hot-pressing bonding role, so that the nanofiber film layer and the inner layer are hot-pressed and bonded together); the outer layer is a water-repellent, flame-retardant SMS non-woven fabric, and the outer layer, the intermediate layer, and the inner layer are laminated and bonded together. At the same time, an antibacterial agent is added to the nanofiber film layer, so that the nanofiber film has filtering, antibacterial and sterilization functions.

[0021] CN 115139599 A discloses a reusable medical protective fabric, which comprises a surface layer, an intermediate layer and an inner layer arranged in sequence; the surface layer is made of chemical fiber with metal oxide powder dispersed inside, and the wearer can be sterilized directly under ultraviolet irradiation environment, and ultraviolet rays will not penetrate the medical protective fabric, so that the human body is protected from ultraviolet damage. It can withstand more than 10 washing and sterilization processes, and various performance indicators can still meet GB19082-2009 "Technical Requirements for Disposable Medical Protective Clothing".

[0022] Both CN117681501A and CN117617614A provide a reusable medical biological protective clothing fabric. The main body of the protective clothing fabric is a graphene composite fabric. The graphene composite fabric consists of three layers of fabric: a surface antibacterial and antiviral protective fabric, a middle layer of high moisture permeability and high barrier virus protection film (PU microporous film), and an inner layer of antibacterial, moisture-absorbing and quick-drying fabric. The reusable medical biological protective clothing fabric is obtained by stretching, gluing, bonding, steam curing and rolling the three layers of materials. It can be repeatedly disinfected and used for no less than 10 times.

[0023] The reusable medical protective materials prepared by the above three existing technologies have the following technical defects:

[0024] First, the current protection mechanism of antibacterial and antiviral materials is based on physical barriers of interception effect (using barrier membranes to isolate viruses from the human body, so that the viruses cannot exchange substances and die), mainly relying on electrostatic effects to adsorb bacteria and viruses on the surface of the barrier layer or filter element. However, adsorption and isolation cannot kill active bacteria and viruses. Bacteria and viruses can still retain strong infectivity after being intercepted on the surface of protective materials. Active bacteria and viruses are likely to enter the human body through unconscious contact with limbs, which can easily lead to subsequent secondary infections and cross-infections, seriously threatening the health of medical staff. In addition, protective products that are directly discarded without proper disinfection may become a new source of pollution, causing bacteria and viruses to spread rapidly, which can easily cause unpredictable serious consequences.

[0025] Second, the protective efficacy of antibacterial and antiviral materials needs to be strengthened. The base fabric of the laminated fabric or coated fabric used in the current reusable protective fabric is a woven fabric. In order to make the protective fabric "actively protect", the base fabric must have antibacterial and antiviral functions. In view of the long service life of reusable protective fabrics and high requirements for washing and disinfection resistance, it is necessary to start from the raw materials and prepare the base fabric through spinning, weaving, dyeing and other processing processes. At present, there are few studies on fiber products with dual antibacterial and antiviral functions; at the same time, the content of antibacterial and antiviral active ingredients in the matrix of existing fiber products is small, unevenly distributed, and the added antibacterial and antiviral agents have weak killing ability, resulting in serious lack of protective efficacy of reusable protective fabrics. The defects of protective products not only seriously threaten the life safety of medical staff, but also accelerate the consumption of protective products, bring huge pressure to the supply system of medical and health protective supplies, and directly affect the treatment of patients and the control of viral infection.

[0026] Third, the current antibacterial and antiviral materials are mainly multi-layer composite structures. When the base fabric and the membrane are composited, adhesives, hot melt and other methods are used. When the multi-layer composite is thermally bonded, the amount of adhesives such as hot melt adhesives is difficult to control. When the amount is small, the bonding force between the layers is low, and it is difficult to form a stable composite membrane fabric; when the amount of hot melt adhesive is large, it is easy to cause glue penetration and affect the style of the fabric, resulting in a significant increase in the overall unit area of ​​the thermal protection composite membrane fabric, and it is impossible to achieve lightweight and high performance. At the same time, comfort performance indicators such as air permeability and moisture permeability are significantly reduced.

[0027] Fourth, current antibacterial and antiviral materials are made by bonding multiple single-layer fabrics or films with hot-melt adhesive. In actual production, it is difficult to achieve uniform distribution of the adhesive, resulting in uneven texture of the composite film fabric, weak bonding in certain areas, and even antibacterial and antiviral "weak areas".

[0028] Fifth, the washing and disinfection resistance of antibacterial and antiviral materials needs to be improved. Compared with disposable protective fabrics, in addition to having excellent barrier and protection properties, antibacterial and antiviral protective fabrics should also have washing and disinfection resistance, that is, the protective clothing will not be broken, worn and flocculent, and the protective performance will not be weakened due to external forces during repeated washing and wearing. At present, in order to take into account both protective performance and comfort performance, reusable protective fabrics are mostly made by laminating the base fabric. Commonly used barrier films include PE film, PU film and PTFE film. Among them, PE film is cheap and has a certain barrier ability, but the air permeability of protective clothing after lamination is poor, which reduces the comfort of protective clothing. After washing and disinfection, the PE film structure is easily completely destroyed and leakage occurs. The PU film has low moisture permeability, which produces a stuffy feeling when worn for a long time and poor comfort. The PTFE film has good moisture permeability, but its bonding performance with the base fabric is poor. It will be delaminated after about 8 washings, and its washing resistance is insufficient.

[0029] Sixth, most of the current antibacterial and antiviral materials are high-density woven fabrics made of chemical fibers, and there are no pure bio-based fiber materials. Chemical fibers are synthesized from petroleum-based raw materials, which are highly dependent on petroleum resources. my country's dependence on foreign oil is as high as 70%. Therefore, non-bio-based chemical fiber raw materials are high-carbon fiber materials with environmental risks, and have shortcomings such as "high energy consumption, high emissions, and high pollution". Summary of the invention

[0030] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a bio-based, wash-resistant, antibacterial and antiviral material, and a method for preparing the material.

[0031] A method for preparing a bio-based antibacterial and antiviral material that is resistant to washing and disinfection, comprising the following steps:

[0032] Step 1, preparation of bio-based antibacterial and antiviral hot melt fibers: first, bio-based low-melting point polymer chips are uniformly mixed with antibacterial and antiviral powders, dispersants, thickeners and cross-linking agents; the mixture is then extruded and granulated through a screw extruder, and the pellets are cut and dried to obtain bio-based antibacterial and antiviral masterbatches; the bio-based antibacterial and antiviral masterbatches are then blended and melted through a screw extruder to form a melt, which is spun through a spinneret and then cooled by side blowing to form primary fibers. The primary fibers are subjected to heat drawing, oiling and winding to obtain bio-based antibacterial and antiviral hot melt fibers.

[0033] Step 2, spinning of bio-based antibacterial and antiviral yarn: two bio-based antibacterial and antiviral filaments are paralleled and twisted with one bio-based temperature-regulating viscose filament, and then paralleled and twisted in a certain arrangement to form the antibacterial and antiviral yarn.

[0034] Step 3, preparation of the base fabric: using the bio-based antibacterial and antiviral hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer (front) of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric.

[0035] Step 4, preparation of bio-based antibacterial and antiviral protective material that is resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll it up to form the bio-based antibacterial and antiviral protective material that is resistant to washing.

[0036] The bio-based low melting point polymer slice described in step 1 is one of polyester-based, polyamide-based and polypropylene-based.

[0037] The dispersant described in step 1 is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol in equal quantities.

[0038] The thickener described in step 1 is a mixture of four substances of equal mass, including polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide.

[0039] The cross-linking agent in step 1 is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate and N-(hydroxymethyl)acrylamide in equal weight.

[0040] The antibacterial and antiviral powder described in step 1 is compounded from natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials, and organic antibacterial and antiviral materials.

[0041] The mass ratio of the natural antibacterial and antiviral material, the inorganic antibacterial and antiviral material and the organic antibacterial and antiviral material in the antibacterial and antiviral powder described in step 1 is (1-2): (5-7): (2-3).

[0042] The natural antibacterial material in the antibacterial and antiviral powder described in step 1 is prepared by mixing purslane extract, tea polyphenols, chitosan, and antimicrobial peptides in equal mass ratios;

[0043] The inorganic antibacterial and antiviral material in the antibacterial and antiviral powder described in step 1 is prepared by mixing nano titanium dioxide, zinc oxide, and graphene in equal mass ratios;

[0044] The organic antibacterial and antiviral material in the antibacterial and antiviral powder described in step 1 is prepared by mixing sulfasalazine, pyridine N-oxide, ethyl 3-hydroxybutyrate, and lysozyme in equal mass ratios.

[0045] The particle size of the nano antibacterial and antiviral powder described in step 1 is 20-50 nm.

[0046] In the mixture described in step 1, the bio-based polymer chips account for 60% to 72%, the nano antibacterial and antiviral powder accounts for 20% to 30%, the dispersant accounts for 3% to 5%, the thickener accounts for 1% to 3%, and the cross-linking agent accounts for 2% to 5%. The sum of the mass ratios of the above substances is 100%.

[0047] The melting point of the bio-based antibacterial and antiviral thermal fuse prepared in step 1 is 110° C. to 130° C.;

[0048] The arrangement of the bio-based antibacterial and antiviral filaments and the bio-based temperature-regulating viscose filaments described in step 2 is, from left to right, 1 bio-based antibacterial and antiviral filament+1 bio-based temperature-regulating viscose filament+1 bio-based antibacterial and antiviral filament.

[0049] The base fabric structure described in step 3 is formed by interweaving and connecting two types of warp and weft yarns of the outer layer and the inner layer through the surface weft and the inner warp.

[0050] The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer described in step 3 is 14.06 tex to 16.87 tex.

[0051] The base fabric described in step 3 has biomass carbon-based conductive composite yarns interwoven and woven on the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 8 to 12 mm.

[0052] The linear density of the biomass carbon-based conductive composite yarn described in step 3 is 2.22 tex to 4.44 tex;

[0053] The linear density of the self-made bio-based antibacterial and antiviral thermal fuse described in step 3 is 2.22 tex to 11.11 tex;

[0054] The surface fabric structure described in step 3 is plain weave or twill weave, and the inner fabric structure is plain weave or twill weave.

[0055] The arrangement ratio of the outer and inner yarns in step 3 is 2:1.

[0056] The base fabric described in step 3 has a warp density of 535 to 570 strands / 10 cm, and a weft density of 453 to 492 strands / 10 cm.

[0057] The mass per unit area of ​​the base fabric described in step 3 is 140-160 g / m 2 The unit area mass ratio of the inner and outer fabrics is 2:1.

[0058] The thermal bonding temperature described in step 4 is 130° C. to 150° C.;

[0059] The nano waterproof breathable membrane described in step 4 is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.20-0.40 mm;

[0060] The unit area mass of the nano waterproof breathable membrane described in step 4 is 20-40 g / m 2 ;

[0061] The mass per unit area of ​​the composite fabric in step 4 is 160-200 g / m 2 .

[0062] Compared with the prior art, the present invention has the following advantages:

[0063] First, the antibacterial and antiviral protective material resistant to washing described in the present invention has antibacterial and antiviral hot-melt threads creatively woven into the reverse side of the fabric during the weaving process of the base fabric. After the introduced antibacterial and antiviral hot-melt thread layer is melted by heat, it can be used as an adhesive for thermal bonding of the base fabric and the waterproof breathable membrane, avoiding the weight gain of the fabric caused by the additional coating of adhesive in the prior art, and achieving "zero weight gain" of the adhesive during the processing of the coated composite fabric; at the same time, the distribution and quantity of the antibacterial and antiviral hot-melt threads are determined during weaving, achieving precise control of the adhesive content and the coating position, and solving the technical problems of the prior art of glue seepage when the adhesive content is too high and insufficient bonding strength when the adhesive content is too low.

[0064] Secondly, the bio-based antibacterial and antiviral hot-melt thread woven into the base fabric during weaving of the present invention significantly improves the bonding strength between the hot-melt inner layer and the outer layer of the fabric by joining the inner and outer layers of warp and weft yarns. After the bio-based hot-melt thread is melted, the base fabric and the waterproof breathable membrane are surface-bonded with high bonding strength, which solves the problem of low peeling strength of the existing adhesive bonding between the waterproof breathable membrane and the base fabric, and the delamination phenomenon caused after multiple washings. It significantly improves the resistance of the antibacterial and antiviral material to decontamination and washing, increases the number of times the protective material can be reused, and significantly reduces the cost of a single use.

[0065] Third, the bio-based antibacterial and antiviral hot-melt threads are woven into the base fabric during weaving. After the bio-based hot-melt threads are melted, the antibacterial and antiviral powders evenly distributed in the matrix of the bio-based antibacterial and antiviral hot-melt threads can be effectively released. The antibacterial and antiviral hot-melt threads not only play the role of "bonding", but also serve as the "carrier" of "antibacterial and antiviral". In addition, during weaving, the antibacterial and antiviral hot-melt threads are evenly and regularly arranged in the warp and weft directions, which also realizes the precise and uniform "delivery" of the antibacterial and antiviral powders, avoiding the protective "weak areas" caused by the uneven distribution of the antibacterial and antiviral powders. The outer layer of the fabric and the adhesive layer have antibacterial and antiviral functions at the same time, which greatly improves and balances the overall performance of the antibacterial and antiviral materials.

[0066] Fourth, the bio-based antibacterial and antiviral protective material developed by the present invention, the antibacterial and antiviral powder of which is compounded from natural antibacterial materials, inorganic antibacterial materials and organic antibacterial materials, adopts the antibacterial and antiviral powder compounding technology, and cleverly compounds powders with different antibacterial and antiviral action mechanisms to complement each other, thereby achieving the synergistic cooperation of different components of the composite antibacterial agent. The killing efficiency after combination is far better than that of single-component antibacterial and antiviral agents, which improves the drug resistance and broad spectrum of antibacterial and antiviral agents, realizes component synergy, mechanism linkage, and functional integration, and achieves the effect of 1+1>2.

[0067] Fifth, when preparing bio-based antibacterial and antiviral hot-melt filaments, the present invention adds dispersants, thickeners, cross-linking agents and other chemical additives to the spinning solution, so that the antibacterial and antiviral agent reacts chemically with the hot-melt polymer matrix to form a dense and stable macromolecular network structure, thereby improving the content and distribution uniformity of the antibacterial and antiviral agent. The macromolecular network structure is regulated to form a regular cross-section of the primary fiber, which is conducive to the formation of fiber orientation and crystal structure, and improves the mechanical properties of the fiber, solving the technical defects of the antibacterial and antiviral fiber on the market, such as single function, poor mechanical properties, high processing difficulty, weak killing ability, and poor resistance to decontamination and washing.

[0068] Sixth, the present invention innovatively directly compounds the base fabric with the ePTFE nanofilm. In the interlayer between the base fabric and the film, the high-content, evenly distributed high-efficiency broad-spectrum antibacterial and antiviral powder works together with the antibacterial and antiviral materials in the outer fabric to actively kill bacteria and viruses in the air. At the same time, under the barrier effect of the ePTFE nanofilm, bacteria and viruses gather between the outer base fabric and the barrier film, so that the high-efficiency broad-spectrum antibacterial and antiviral agent has sufficient time to completely kill bacteria and viruses, achieving active, multiple three-dimensional killing. The present invention creatively introduces bio-based thermostatic filaments, which contain phase change materials in the matrix. The phase change materials absorb and release heat through phase transition, which can provide a relatively stable microclimate comfortable environment inside the clothes for the human body. The present invention compounds thermostatic and antibacterial and antiviral functions. The thermostatic function can effectively buffer the instantaneous temperature changes of the skin, reduce the thermal stress generated by the human body when wearing clothes in a hot and humid environment, and improve the hot and humid comfort performance of the protective material.

[0069] Seventh, the antibacterial and antiviral materials resistant to disinfection and washing prepared by the present invention are mostly processed from bio-based materials, which meet the definition requirements of bio-based materials in the standard GB / T 39514-2020 "Terms, Definitions and Identification of Bio-based Materials". It can be seen that the antibacterial and antiviral protective material developed by the present invention is a green, environmentally friendly, renewable, biodegradable, "negative carbon" bio-based material. The preparation and application of this material will help solve the problems of resource shortage and environmental pollution faced by the world, and will help promote the rapid transformation of bio-based materials to gradually replace petroleum-based materials, and help make bio-based materials the backbone of green and low-carbon development.

[0070] It can be seen that the adhesive of the present invention has "zero weight gain" when preparing bio-based, wash-resistant, antibacterial and antiviral materials. The protective material is wash-resistant, has excellent drug resistance and broad spectrum, and can actively and completely kill bacteria and viruses in multiple three-dimensional forms. At the same time, it has intelligent temperature control and comfort, and the biomass is degradable, which is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 This is the bio-based, washable, antibacterial and antiviral protective material of the present application.

[0072] 1—Biomass carbon-based conductive composite wire.

[0073] 2—Nano waterproof and breathable membrane.

[0074] 3—Base fabric. It consists of two layers, the outer layer is woven from thermoregulating filaments, bio-based antibacterial and antiviral filaments, and biomass carbon-based conductive filaments; the inner layer is woven from bio-based antibacterial and antiviral hot-melt filaments.

[0075] 4—Inner layer of base fabric: woven from bio-based antibacterial and antiviral hot-melt filaments. DETAILED DESCRIPTION

[0076] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0077] Embodiment 1:

[0078] A method for preparing a bio-based antibacterial and antiviral material that is resistant to washing and disinfection, comprising the following steps:

[0079] Step 1, preparation of bio-based antibacterial and antiviral hot melt wire: first, bio-based low-melting point polymer chips are uniformly mixed with antibacterial and antiviral powders, dispersants, thickeners, and cross-linking agents; then the mixture is extruded and granulated through a screw extruder, and the pellets are cut and dried to obtain bio-based antibacterial and antiviral masterbatch; then the bio-based antibacterial and antiviral masterbatch is blended and melted through a screw extruder to make a melt, which is spun through a spinneret and then cooled by side blowing to form primary fibers. The primary fibers are subjected to heat drawing, oiling, and winding to obtain bio-based antibacterial and antiviral hot melt wires.

[0080] The bio-based low melting point polymer chips are polyester-based;

[0081] The antibacterial and antiviral powder is compounded by natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials. The mass ratio of natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials is 2:7:3. The natural antibacterial material is mixed with purslane extract, tea polyphenols, chitosan and antibacterial peptides in equal mass ratios; the inorganic antibacterial and antiviral material is mixed with nano titanium dioxide, zinc oxide and graphene in equal mass ratios; the organic antibacterial and antiviral material is mixed with sulfasalazine, pyridine N-oxide, 3-hydroxybutyric acid ethyl ester and lysozyme in equal mass ratios.

[0082] The particle size of the nano antibacterial and antiviral powder described in step 1 is 30 nm.

[0083] The dispersant is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol in equal quality.

[0084] The thickener is a mixture of four substances of equal mass, namely, polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide.

[0085] The crosslinking agent is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate and N-(hydroxymethyl)acrylamide in equal quantities.

[0086] Bio-based polymer chips account for 72%, nano-antibacterial and antiviral powders account for 20%, dispersants account for 3%, thickeners account for 2%, and cross-linkers account for 3%.

[0087] Step 2, spinning of bio-based antibacterial and antiviral yarn: 2 bio-based antibacterial and antiviral filaments are paralleled and twisted with 1 bio-based thermostatic viscose filament, and then twisted in a certain arrangement to form a bio-based antibacterial and antiviral yarn. The arrangement is from left to right: 1 bio-based antibacterial and antiviral filament + 1 bio-based thermostatic viscose filament + 1 bio-based antibacterial and antiviral filament.

[0088] Step 3, preparation of the base fabric: using the bio-based antibacterial and antiviral hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer (front) of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric.

[0089] The base fabric structure is formed by interweaving two types of warp and weft yarns, the outer layer and the inner layer, through the surface weft and the inner warp.

[0090] The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer is 14.06tex.

[0091] The biomass carbon-based conductive composite yarns are interwoven and woven on the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 8 mm.

[0092] The linear density of biomass carbon-based conductive composite yarn is 2.22tex;

[0093] The linear density of the bio-based antibacterial and antiviral thermal fuse is 11.11tex;

[0094] The melting point of the bio-based antibacterial and antiviral thermal fuse described in step 3 is 130° C.;

[0095] The surface fabric structure described in step 3 is a plain weave, and the inner fabric structure is a plain weave.

[0096] The arrangement ratio of the outer and inner yarns in step 3 is 2:1.

[0097] The base fabric described in step 2 has a warp density of 535 strands / 10 cm and a weft density of 464 strands / 10 cm.

[0098] The mass per unit area of ​​the base fabric described in step 3 is 140 g / m 2 The unit area mass ratio of the inner and outer fabrics is 2:1.

[0099] Step 4, preparation of bio-based antibacterial and antiviral protective material that is resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll it up to form the bio-based antibacterial and antiviral protective material that is resistant to washing.

[0100] The thermal bonding temperature is 150°C; the nano waterproof breathable membrane is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.4mm; the unit area mass of the nano waterproof breathable membrane is 40g / m 2 The unit area mass of the membrane composite fabric obtained after thermal bonding is 180g / m 2 .

[0101] Embodiment 2:

[0102] A method for preparing a bio-based antibacterial and antiviral material that is resistant to washing and disinfection, comprising the following steps:

[0103] Step 1, preparation of bio-based antibacterial and antiviral hot melt wire: first, bio-based low-melting point polymer chips are uniformly mixed with antibacterial and antiviral powders, dispersants, thickeners, and cross-linking agents; then the mixture is extruded and granulated through a screw extruder, and the pellets are cut and dried to obtain bio-based antibacterial and antiviral masterbatch; then the bio-based antibacterial and antiviral masterbatch is blended and melted through a screw extruder to make a melt, which is spun through a spinneret and then cooled by side blowing to form primary fibers. The primary fibers are subjected to heat drawing, oiling, and winding to obtain bio-based antibacterial and antiviral hot melt wires.

[0104] The bio-based low melting point polymer chips are polyester-based;

[0105] The antibacterial and antiviral powder is compounded by natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials. The mass ratio of natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials is 1:5:2. The natural antibacterial material is mixed with purslane extract, tea polyphenols, chitosan and antibacterial peptides in equal mass ratios; the inorganic antibacterial and antiviral material is mixed with nano titanium dioxide, zinc oxide and graphene in equal mass ratios; the organic antibacterial and antiviral material is mixed with sulfasalazine, pyridine N-oxide, ethyl 3-hydroxybutyrate and lysozyme in equal mass ratios.

[0106] The particle size of the nano antibacterial and antiviral powder described in step 1 is 40 nm.

[0107] The dispersant is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol in equal quality.

[0108] The thickener is a mixture of four substances of equal mass, namely, polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide.

[0109] The crosslinking agent is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate and N-(hydroxymethyl)acrylamide in equal quantities.

[0110] Biomass polymer chips account for 65%, nano-antibacterial and antiviral powders account for 25%, dispersants account for 4%, thickeners account for 2%, and cross-linking agents account for 4%.

[0111] Step 2, spinning of bio-based antibacterial and antiviral yarn: 2 bio-based antibacterial and antiviral filaments are paralleled and twisted with 1 bio-based thermostatic viscose filament, and then twisted in a certain arrangement to form a bio-based antibacterial and antiviral yarn. The arrangement is from left to right: 1 bio-based antibacterial and antiviral filament + 1 bio-based thermostatic viscose filament + 1 bio-based antibacterial and antiviral filament.

[0112] Step 3, preparation of the base fabric: using the bio-based antibacterial and antiviral hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer (front) of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric.

[0113] The base fabric structure is formed by interweaving two types of warp and weft yarns, the outer layer and the inner layer, through the surface weft and the inner warp.

[0114] The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer is 15.54tex.

[0115] The biomass carbon-based conductive composite yarns are interwoven and woven in the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 12 mm.

[0116] The linear density of biomass carbon-based conductive composite yarn is 3.33tex;

[0117] The linear density of the bio-based antibacterial and antiviral thermal fuse is 8.33tex;

[0118] The melting point of the bio-based antibacterial and antiviral thermal fuse described in step 3 is 110° C.;

[0119] The surface fabric structure described in step 3 is a plain weave, and the inner fabric structure is a twill weave.

[0120] The arrangement ratio of the outer and inner yarns in step 3 is 2:1.

[0121] The base fabric described in step 2 has a warp density of 570 strands / 10 cm and a weft density of 492 strands / 10 cm.

[0122] The mass per unit area of ​​the base fabric described in step 3 is 150g / m 2 The unit area mass ratio of the inner and outer fabrics is 2:1.

[0123] Step 4, preparation of bio-based antibacterial and antiviral protective material that is resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll it up to form the bio-based antibacterial and antiviral protective material that is resistant to washing.

[0124] The thermal bonding temperature is 130°C; the nano waterproof breathable membrane is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.2mm; the unit area mass of the nano waterproof breathable membrane is 30g / m 2 The unit area mass of the membrane composite fabric obtained after thermal bonding is 180g / m 2 .

[0125] Embodiment 3:

[0126] A method for preparing a bio-based antibacterial and antiviral material that is resistant to washing and disinfection, comprising the following steps:

[0127] Step 1, preparation of bio-based antibacterial and antiviral hot melt wire: first, bio-based low-melting point polymer chips are uniformly mixed with antibacterial and antiviral powders, dispersants, thickeners, and cross-linking agents; then the mixture is extruded and granulated through a screw extruder, and the pellets are cut and dried to obtain bio-based antibacterial and antiviral masterbatch; then the bio-based antibacterial and antiviral masterbatch is blended and melted through a screw extruder to make a melt, which is spun through a spinneret and then cooled by side blowing to form primary fibers. The primary fibers are subjected to heat drawing, oiling, and winding to obtain bio-based antibacterial and antiviral hot melt wires.

[0128] The bio-based low melting point polymer chips are polyester-based;

[0129] The antibacterial and antiviral powder is compounded by natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials. The mass ratio of natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials is 1:6:3. The natural antibacterial material is mixed with purslane extract, tea polyphenols, chitosan and antibacterial peptides in equal mass ratios; the inorganic antibacterial and antiviral material is mixed with nano titanium dioxide, zinc oxide and graphene in equal mass ratios; the organic antibacterial and antiviral material is mixed with sulfasalazine, pyridine N-oxide, 3-hydroxybutyric acid ethyl ester and lysozyme in equal mass ratios.

[0130] The particle size of the nano antibacterial and antiviral powder described in step 1 is 20 nm.

[0131] The dispersant is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol in equal quality.

[0132] The thickener is a mixture of four substances of equal mass, namely, polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide.

[0133] The crosslinking agent is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate and N-(hydroxymethyl)acrylamide in equal quantities.

[0134] Bio-based polymer chips account for 60%, nano-antibacterial and antiviral powders account for 30%, dispersants account for 3%, thickeners account for 2%, and cross-linkers account for 5%.

[0135] Step 2, spinning of bio-based antibacterial and antiviral yarn: 2 bio-based antibacterial and antiviral filaments are paralleled and twisted with 1 bio-based thermostatic viscose filament, and then twisted in a certain arrangement to form a bio-based antibacterial and antiviral yarn. The arrangement is from left to right: 1 bio-based antibacterial and antiviral filament + 1 bio-based thermostatic viscose filament + 1 bio-based antibacterial and antiviral filament.

[0136] Step 3, preparation of the base fabric: using the bio-based antibacterial and antiviral hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer (front) of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric.

[0137] The base fabric structure is formed by interweaving two types of warp and weft yarns, the outer layer and the inner layer, through the surface weft and the inner warp.

[0138] The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer is 16.84tex.

[0139] The biomass carbon-based conductive composite yarns are interwoven and woven on the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 10 mm.

[0140] The linear density of biomass carbon-based conductive composite yarn is 4.44tex;

[0141] The linear density of the bio-based antibacterial and antiviral thermal fuse is 11.11tex;

[0142] The melting point of the bio-based antibacterial and antiviral thermal fuse described in step 3 is 120° C.

[0143] The surface fabric structure described in step 3 is a twill weave, and the inner fabric structure is a plain weave.

[0144] The arrangement ratio of the outer and inner yarns in step 3 is 2:1.

[0145] The base fabric described in step 2 has a warp density of 543 strands / 10 cm and a weft density of 453 strands / 10 cm.

[0146] The mass per unit area of ​​the base fabric described in step 3 is 160 g / m 2The unit area mass ratio of the inner and outer fabrics is 2:1.

[0147] Step 4, preparation of bio-based antibacterial and antiviral protective material that is resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll it up to form the bio-based antibacterial and antiviral protective material that is resistant to washing.

[0148] The thermal bonding temperature is 140°C; the nano waterproof breathable membrane is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.3mm; the unit area mass of the nano waterproof breathable membrane is 40g / m 2 The unit area mass of the membrane composite fabric obtained after thermal bonding is 200g / m 2 .

[0149] Embodiment 4:

[0150] A method for preparing a bio-based antibacterial and antiviral material that is resistant to washing and disinfection, comprising the following steps:

[0151] Step 1, preparation of bio-based antibacterial and antiviral hot melt wire: first, bio-based low-melting point polymer chips are uniformly mixed with antibacterial and antiviral powders, dispersants, thickeners, and cross-linking agents; then the mixture is extruded and granulated through a screw extruder, and the pellets are cut and dried to obtain bio-based antibacterial and antiviral masterbatch; then the bio-based antibacterial and antiviral masterbatch is blended and melted through a screw extruder to make a melt, which is spun through a spinneret and then cooled by side blowing to form primary fibers. The primary fibers are subjected to heat drawing, oiling, and winding to obtain bio-based antibacterial and antiviral hot melt wires.

[0152] The bio-based low melting point polymer chips are polyester-based;

[0153] The antibacterial and antiviral powder is compounded by natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials. The mass ratio of natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials is 2:7:2. The natural antibacterial material is mixed with purslane extract, tea polyphenols, chitosan and antibacterial peptides in equal mass ratios; the inorganic antibacterial and antiviral material is mixed with nano titanium dioxide, zinc oxide and graphene in equal mass ratios; the organic antibacterial and antiviral material is mixed with sulfasalazine, pyridine N-oxide, ethyl 3-hydroxybutyrate and lysozyme in equal mass ratios.

[0154] The particle size of the nano antibacterial and antiviral powder described in step 1 is 50 nm.

[0155] The dispersant is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol in equal quality.

[0156] The thickener is a mixture of four substances of equal mass, namely, polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide.

[0157] The crosslinking agent is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate and N-(hydroxymethyl)acrylamide in equal quantities.

[0158] Bio-based polymer chips account for 60%, nano-antibacterial and antiviral powders account for 30%, dispersants account for 5%, thickeners account for 3%, and cross-linkers account for 2%.

[0159] Step 2, spinning of bio-based antibacterial and antiviral yarn: 2 bio-based antibacterial and antiviral filaments are paralleled and twisted with 1 bio-based thermostatic viscose filament, and then twisted in a certain arrangement to form a bio-based antibacterial and antiviral yarn. The arrangement is from left to right: 1 bio-based antibacterial and antiviral filament + 1 bio-based thermostatic viscose filament + 1 bio-based antibacterial and antiviral filament.

[0160] Step 3, preparation of the base fabric: using the bio-based antibacterial and antiviral hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer (front) of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric.

[0161] The base fabric structure is formed by interweaving two types of warp and weft yarns, the outer layer and the inner layer, through the surface weft and the inner warp.

[0162] The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer is 16.87 tex.

[0163] The biomass carbon-based conductive composite yarns are interwoven and woven on the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 10 mm.

[0164] The linear density of biomass carbon-based conductive composite yarn is 2.22tex;

[0165] The linear density of the bio-based antibacterial and antiviral thermal fuse is 8.33tex;

[0166] The melting point of the bio-based antibacterial and antiviral thermal fuse described in step 3 is 120° C.

[0167] The surface fabric structure described in step 3 is twill weave, and the inner fabric structure is twill weave.

[0168] The arrangement ratio of the outer and inner yarns in step 3 is 2:1.

[0169] The base fabric described in step 2 has a warp density of 570 strands / 10 cm and a weft density of 492 strands / 10 cm.

[0170] The mass per unit area of ​​the base fabric described in step 3 is 160 g / m 2 The unit area mass ratio of the inner and outer fabrics is 2:1.

[0171] Step 4, preparation of antibacterial and antiviral protective materials resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll them up to form antibacterial and antiviral protective materials resistant to washing.

[0172] The thermal bonding temperature is 140°C; the nano waterproof breathable membrane is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.3mm; the unit area mass of the nano waterproof breathable membrane is 30g / m 2 The unit area mass of the membrane composite fabric obtained after thermal bonding is 190g / m 2 .

[0173] Comparative Example 1:

[0174] A method for preparing a bio-based, wash-resistant antibacterial and antiviral material, wherein the antibacterial and antiviral powder in step 1 only uses natural antibacterial materials, and the rest is the same as Example 4.

[0175] Comparative Example 2:

[0176] A method for preparing a bio-based, wash-resistant antibacterial and antiviral material, wherein the antibacterial and antiviral powder in step 1 only uses inorganic antibacterial material, and the rest is the same as Example 4.

[0177] Comparative Example 3:

[0178] A method for preparing a bio-based, wash-resistant antibacterial and antiviral material, wherein the antibacterial and antiviral powder in step 1 only uses organic antibacterial material, and the rest is the same as Example 4.

[0179] Comparative Example 4:

[0180] A method for preparing a bio-based, wash-resistant antibacterial and antiviral material, wherein the mass ratio of the natural antibacterial and antiviral material, the inorganic antibacterial and antiviral material, and the organic antibacterial and antiviral material in the antibacterial and antiviral powder in step 1 is 1:1:1, and the rest is the same as Example 4.

[0181] Comparative Example 5:

[0182] A method for preparing a bio-based, wash-resistant, antibacterial and antiviral material, wherein no cross-linking agent is added in step 1, and the rest is the same as in Example 4.

[0183] The antibacterial properties of the bio-based antibacterial and antiviral materials prepared in Examples 1-4 and Comparative Examples 1-5 were tested according to the standard GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles Part 3-Oscillation Method", and the antiviral properties were tested according to the standard ISO 18184-2019 "Determination of Antiviral Activity of Textiles"; after the materials were treated with decontamination according to the standard YY / T 0802-2020 "Processing of Medical Devices - Information Provided by Medical Device Manufacturers", the peeling strength of the materials was tested according to the standard FZ / T60039-2013 "Peeling Strength Test Method for Coated Fabrics for Membrane Structures", the penetration resistance of infectious factors was tested according to YY / T 1799-2020 "Technical Requirements for Reusable Medical Protective Clothing", and the antistatic properties of the materials were tested according to the standard GB12014-2019 "Protective Clothing Antistatic Clothing". The actual measured data of various properties of the final bio-based antibacterial and antiviral materials are shown in Table 1. Analysis of the test data in Table 1 revealed that:

[0184] When the antibacterial and antiviral material contains only a single component (Comparative Example 1, Comparative Example 2, Comparative Example 3) or the mass of the three antibacterial and antiviral materials is equal (Comparative Example 4), the antibacterial and antiviral properties of the prepared material are Much lower than It also contains the antibacterial and antiviral properties of three kinds of natural, inorganic and organic antibacterial and antiviral materials (and the three materials are optimally compounded). It can be seen that after compounding the three kinds of natural, inorganic and organic antibacterial and antiviral materials, powders with different antibacterial and antiviral action mechanisms can be cleverly compounded to complement each other's strengths and weaknesses, thereby achieving component synergy, mechanism linkage, and functional integration, and achieving the effect of 1+1>2.

[0185] When no cross-linking agent is added when preparing the bio-based antibacterial and antiviral hot melt wire (Comparative Example 5), compared with Example 4, the antibacterial and antiviral performance of the material is greatly reduced after 100 times of decontamination. It can be seen that after the cross-linking agent is added, a chemical reaction can occur between the antibacterial and antiviral agent and the hot-melt polymer matrix to form a dense and stable macromolecular network structure, which significantly improves the decontamination resistance of the protective material.

[0186] Table 1 Performance test of bio-based antibacterial and antiviral materials prepared in Examples 1-4 and Comparative Examples 1-5

[0187]

[0188] The principles, steps, etc. not explicitly described in the present invention are all obtainable by those skilled in the art through conventional technical means, and therefore are not described in detail. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for preparing a bio-based antibacterial and antiviral material, characterized in that: The following steps are involved: Step 1, preparation of bio-based antibacterial and antiviral hot melt wire: first, bio-based low-melting point polymer slices are uniformly mixed with nano antibacterial and antiviral powder, dispersant, thickener and cross-linking agent; then the mixture is extruded and granulated by a screw extruder, and the granules are cut and dried to obtain bio-based antibacterial and antiviral masterbatch; then the bio-based antibacterial and antiviral masterbatch is blended and melted by a screw extruder to make a melt, which is spun by a spinneret and then cooled by side blowing to form primary fibers, and the primary fibers are subjected to heat drawing, oiling and winding to obtain bio-based antibacterial and antiviral hot melt wire; wherein the nano antibacterial and antiviral powder described in step 1 is compounded from natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials; the mass ratio of natural antibacterial and antiviral materials, inorganic antibacterial and antiviral materials and organic antibacterial and antiviral materials in the nano antibacterial and antiviral powder described in step 1 is (1~2):(5~7):(2~3); Step 2, spinning of bio-based antibacterial and antiviral yarn: two bio-based antibacterial and antiviral filaments are paralleled and twisted with one bio-based thermostatic viscose filament, and the two filaments are paralleled and twisted in a certain arrangement to form the bio-based antibacterial and antiviral yarn; Step 3, preparation of base fabric: using the antibacterial and antiviral bio-based hot-melt yarn prepared in step 1 as the inner warp and weft yarns of the fabric, using the bio-based antibacterial and antiviral yarn spun in step 2 as the outer warp and weft yarns, and interweaving the biomass carbon-based conductive composite yarns at equal intervals on the outer layer of the fabric, and sequentially performing warping, reeding, weaving, and cloth repairing to obtain the base fabric; Step 4, preparation of bio-based antibacterial and antiviral protective material that is resistant to washing: thermally bond the base fabric prepared in step 3 to the laminated surface of the nano waterproof and breathable membrane, and finally roll it up to form the bio-based antibacterial and antiviral protective material that is resistant to washing.

2. The method for preparing a bio-based antibacterial and antiviral material resistant to decontamination according to claim 1, characterized in that: The bio-based low melting point polymer slice in step 1 is one of a polyester-based polymer slice, a polyamide-based polymer slice, and a polypropylene-based polymer slice; The dispersant in step 1 is a mixture of polyacrylic acid, polyacrylamide and polyethylene glycol of equal quality; The thickener in step 1 is a mixture of four substances of equal mass, including polyoxyethylene, dibutyl acrylate, N,N′-methylenebisacrylamide and alkanolamide; The crosslinking agent in step 1 is a mixture of dicumyl peroxide, 2-hydroxyethyl acrylate, and N-(hydroxymethyl)acrylamide in equal weight; In the mixture described in step 1, the bio-based polymer slices account for 60% to 72%, the nano antibacterial and antiviral powder accounts for 20% to 30%, the dispersant accounts for 3% to 5%, the thickener accounts for 1% to 3%, and the cross-linking agent accounts for 2% to 5%, and the sum of the mass ratios of the above substances is 100%; The melting point of the bio-based antibacterial and antiviral thermal fuse prepared in step 1 is 110°C to 130°C.

3. The method for preparing a bio-based antibacterial and antiviral material resistant to decontamination according to claim 2, characterized in that: The natural antibacterial material in the nano antibacterial and antiviral powder described in step 1 is prepared by mixing purslane extract, tea polyphenols, chitosan, and antimicrobial peptides in equal mass ratios; The inorganic antibacterial and antiviral material in the nano antibacterial and antiviral powder described in step 1 is prepared by mixing nano titanium dioxide, zinc oxide and graphene in equal mass ratios; The organic antibacterial and antiviral material in the nano antibacterial and antiviral powder described in step 1 is prepared by mixing sulfasalazine, pyridine N-oxide, ethyl 3-hydroxybutyrate, and lysozyme in equal mass ratios; The particle size of the nano antibacterial and antiviral powder described in step 1 is 20-50 nm.

4. A method for preparing a bio-based antibacterial and antiviral material resistant to decontamination according to any one of claims 1 to 3, characterized in that: The arrangement of the bio-based antibacterial and antiviral filaments and the bio-based temperature-regulating viscose filaments described in step 2 is, from left to right, 1 bio-based antibacterial and antiviral filament, 1 bio-based temperature-regulating viscose filament, and 1 bio-based antibacterial and antiviral filament.

5. The method for preparing a bio-based antibacterial and antiviral material according to any one of claims 1 to 3, characterized in that: The base fabric structure described in step 3 is formed by interweaving and connecting two types of warp and weft yarns of the outer layer and the inner layer through the surface weft and the inner warp; The linear density of the bio-based antibacterial and antiviral yarn used in the outer layer in step 3 is 14.06 tex to 16.87 tex; The base fabric described in step 3 is interwoven with biomass carbon-based conductive composite yarns on the outer layer, and the geometric figure formed by the conductive composite yarns in the warp and weft directions is a square with a side length of 8 to 12 mm; The linear density of the biomass carbon-based conductive composite yarn described in step 3 is 2.22 tex to 4.44 tex; The linear density of the bio-based antibacterial and antiviral hot-melt thread in the inner layer of the base fabric described in step 3 is 2.22 tex to 11.11 tex; The outer fabric structure in step 3 is plain weave or twill weave, and the inner fabric structure is plain weave or twill weave; The outer and inner yarns in step 3 are arranged in a ratio of 2:1; The base fabric described in step 3 has a warp density of 535 to 570 strands / 10 cm, and a weft density of 453 to 492 strands / 10 cm; The mass per unit area of ​​the base fabric described in step 3 is 140-160 g / m 2 The unit area mass ratio of the inner and outer fabrics is 2:

1.

6. The method for preparing a bio-based antibacterial and antiviral material according to any one of claims 1 to 3, characterized in that: The thermal bonding temperature described in step 4 is 130° C. to 150° C.; The nano waterproof breathable membrane described in step 4 is an ePTFE nano film, and the thickness of the nano waterproof breathable membrane is 0.20-0.40 mm; The unit area mass of the nano waterproof breathable membrane described in step 4 is 20-40 g / m 2 ; The mass per unit area of ​​the bio-based antibacterial and antiviral protective material in step 4 is 160-200 g / m 2 .

7. A bio-based, wash-resistant, antibacterial and antiviral material prepared by the preparation method according to any one of claims 1 to 6.

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