48 results about "Single fibre" patented technology

The invention discloses a method and a system for constructing a fiber scale parameterized model of a single-sided weft-knitted fabric, relates to the field of dynamic simulation of weft-knitted fabrics, and solves the problems that an existing knitted fabric simulation system only displays an embroidery pattern in a yarn scale or a fabric scale and lacks a three-dimensional dynamic effect based on a fiber level and the like. The method comprises the steps that the weft-knitted fabric is formed by mutually intermeshing coils, and the number and coordinates of coil control points are set; the simulation of different knitting effects is realized by adjusting the positions of coil control points; based on the single fiber curve model, using a random jitter algorithm to carry out modeling on the fiber bundle, and constructing an untwisted fiber bundle model and a twisted fiber bundle model; a branch model is constructed to simulate the hairiness form of the weft-knitted fabric, and dynamic regulation and control of hairiness characteristics are achieved by adjusting the number of breakpoints, the branch length range and the disturbance amplitude core parameters. Environment parameters are set, an OpenGL illumination function is used for representing the stereoscopic impression of the weft-knitted fabric model, and after the weft-knitted fabric model is rendered, the model is output.

Fibrous cleaning material and roller compositions for floor cleaners are provided. The fibrous cleaning material can include a plurality of unit fiber sections. Each unit fiber section in the plurality of unit fiber sections can include a first fine fiber material having a fineness of less than about 1 denier, a second fine fiber material having a fineness of between about 1 and 10 denier, a first bristle material having a fineness of between about 10 and 50 denier, and a second bristle material having a fineness of greater than about 100 denier. A bristle lay of the unit fiber section and a small fiber lay of the unit fiber section can be skew relative to each other.

The invention discloses a functional regenerated polyester-nylon composite superfine fiber and a preparation method thereof, and belongs to the technical field of composite fibers. The fiber is of a core-skin structure, a core layer is made of modified regenerated polyester containing superfine graphite, polyethylene glycol and an antibacterial additive, and a skin layer is made of modified regenerated chinlon containing a chain extender, a silane coupling agent and an antibacterial additive; the preparation method comprises the steps of regenerated raw material ultrasonic cleaning, melting chain extension, modified melt preparation, composite spinning and post-treatment splitting. The single fiber linear density of the fiber is 0.142-0.150 dtex, the breaking strength is larger than or equal to 6.5 cN / dtex, the thermal decomposition temperature is larger than or equal to 345 DEG C, the antibacterial rate is larger than or equal to 99.2%, the specific surface area is larger than or equal to 15200 cm < 2 > / g, and the fiber is excellent in comprehensive performance and can be used in the field of high-end electronic dust-free cloth. And the utilization rate of regenerated raw materials is not less than 90%.

The present application provides a packing for gas-liquid contact, which has high gas-liquid contact efficiency and can be formed of light and low-cost material. The present application uses a composite yarn 44 composed of a single fiber and a wire, a combination of a single fiber yarn 42 composed of only a single fiber and a wire yarn 43 composed of only a wire, or a fabric or a knit formed of all or any combination of the single fiber yarn 42, the wire yarn 43, and the composite yarn 44, to constitute a strip-like material 71 having gaps between yarns 46 and yarns 46; and by alternately performing a mountain fold and a valley fold in a direction intersecting the length direction of the strip-like material 41, forming a bellows shape, and stacking a plurality of the bellows-shaped strip-like materials 41, a packing is formed.

The application discloses an automatic testing system for single-fiber interfacial shear strength, which comprises a single fiber with a resin drop, a clamp assembly for vertically fixing the single fiber and stretching the resin drop, and a testing system for detecting the single-fiber interfacial shear strength; the clamp assembly comprises a fixing frame for fixing two ends of the single fiber and movable along the direction of a single-fiber fixing shaft, and a pair of cutters located on both sides of the connection between the fiber and the resin drop; the testing system comprises a resin drop length acquisition module, a shearing force acquisition module, a motion control module and a calculation module. The application further provides an automatic testing method. The system provided by the application can effectively improve the detection accuracy and efficiency of the single-fiber interfacial shear strength.

The present invention pertains to a composite material comprising (a) at least one type of curable resin and (b) at least one type of aramid single fiber, wherein the average diameter of the aramid single fiber (b) as determined by a centrifugal sedimentation method is less than 2000 nm. According to the present invention, an article having excellent mechanical properties can be produced.

The invention relates to the technical field of polyvinyl alcohol fiber surface modification, and particularly provides a method for preparing hyperbranched polyamide surface modified polyvinyl alcohol fibers through a one-step method and application of the hyperbranched polyamide surface modified polyvinyl alcohol fibers in cement-based materials. The surface modification method comprises the following raw material components: 1 part of polyvinyl alcohol fiber, 1-3 parts of 3, 5-diaminobenzoic acid, 0.1-0.3 part of 4-dimethylaminopyridine and 100 parts of N, N-dimethylformamide. The modification method comprises the following steps: mixing the raw materials, and keeping the constant temperature of 50-80 DEG C to react for 2-5 hours to obtain the surface-modified polyvinyl alcohol fiber. The application comprises the following steps: verifying the change of the interfacial strength between the fiber and the cement-based material before and after modification through a single fiber pull-out sample, and obtaining the change of the mechanical property parameters of the fiber before and after modification through a single fiber tensile test. Compared with unmodified polyvinyl alcohol fibers, the tensile strength and the elongation at break of the surface-modified polyvinyl alcohol fibers disclosed by the invention are respectively improved by 1.1-1.6 times and 1.4-2.2 times; the surface-modified polyvinyl alcohol fiber can enhance the interfacial strength with cement, and the interfacial strength can reach 3.7-6.3 times that of unmodified polyvinyl alcohol fiber; the method can be widely applied to the field of fiber reinforced cement-based composite materials, and has a wide application prospect.

The present application relates to the field of large tow carbon fiber continuous production, and discloses an oiling method of large tow precursor.The method comprises the following steps: dividing the large tow precursor into alternate flat sections and folded and bent sections along the length direction, first oiling the large tow precursor, and controlling the oil content of each section to be the same;second oiling the flat sections of the large tow precursor, and controlling the oil content difference between the flat sections and the folded and bent sections of the large tow precursor to be within 0.1% when the large tow precursor is folded and packed and then unwound.After the large tow precursor is oiled by the oiling method provided by the present application, the large tow precursor is flat and folded and packed, and when the large tow precursor is unwound to an oxidation furnace, the oil content difference between the flat sections and the folded and bent sections of the large tow precursor unwound from the box is within 0.1%, the single fibers of the folded and bent sections of the large tow precursor do not adhere to each other, the large tow precursor is easy to separate, the amount of carbon fiber hair is reduced, the strength of the carbon fiber is improved, the carbon fiber is soft and supple, and does not become hard and brittle.

This invention provides a novel false-twist multifilament yarn that has excellent yarn properties such as strength and elongation, and is sufficiently crimped by false-twist processing. When used in clothing or interior goods, it does not naturally disintegrate and can be used under normal conditions. Furthermore, when recycled after use, it can be melted at low temperatures into a resinous substance and molded into a shape that allows it to be pelletized again. [Solution] A false-twist multifilament yarn composed of single fibers formed from a copolymer polyester containing terephthalic acid as an acid component and ethylene glycol and 1,4-butanediol as glycol components, wherein the false-twist multifilament yarn has a breaking strength of 2.0 cN / dtex or more, an elongation at break of 45% or less, a crimping rate of 25-75%, and an elasticity recovery rate of 20-55%.

The application discloses a high-purity and difficult-graphitization viscose-based carbon fiber felt preparation method and equipment, the high-purity and viscose-based carbon fiber felt has impurity element content ratio less than 50ppm, single fiber strength greater than 120Mpa, and graphitization degree less than 85% after 2650 DEG C treatment; the application also provides a high-purity, high-strength and difficult-graphitization viscose-based carbon fiber felt preparation equipment which is composed of a felt inlet air seal section, a heat treatment section, a cooling section, a felt outlet air seal section and a cooling section. The metal impurities in viscose fibers are removed through pickling, the viscose fibers are needled into a felt, impregnated with a catalyst, dried, and then subjected to catalytic dehydration in a micro-negative pressure inert atmosphere, and finally carbonization and graphitization are carried out to obtain the high-purity and high-strength viscose-based carbon fiber felt with low ash content and less tar pollution. The raw materials used in the application are rich, the preparation process is simple, the equipment corrosion is effectively controlled, the high-purity and high-strength product is prepared, and the product production efficiency is greatly improved.

The invention relates to the technical field of functional textile materials, and discloses a sunscreen fabric with a high ultraviolet protection effect and a preparation method thereof.The fabric is prepared from matrix fibers, polyvinyl alcohol, nano inorganic particles, a silane coupling agent and a cross-linking agent; the preparation method comprises the steps of silanization activation pretreatment of matrix fibers, electrostatic spinning coating of a polyvinyl alcohol and nanoparticle composite spinning solution, high-temperature thermal induction chemical anchoring crosslinking and weaving. According to the preparation method, a compact discontinuous nano shielding network is constructed on the surface of a single fiber by utilizing an electrostatic spinning technology, and stable covalent bond combination of a functional layer and a matrix fiber is realized through an epoxy group ring-opening reaction of a silane coupling agent. According to the fabric, efficient ultraviolet protection is achieved, meanwhile, breathable micropores of the fabric are completely reserved, the problems that a traditional coating sunscreen fabric is poor in breathability, stiff in hand feeling and low in washing fastness are effectively solved, and intelligent heat and humidity adjustment can be achieved by introducing temperature-sensitive polyurethane filaments.

The application relates to the technical field of non-woven material preparation, in particular to a preparation process of a high-liquid-absorption spunlace non-woven mask base cloth material, which comprises the following steps: S1. selecting high-liquid-absorption viscose fibers as main raw materials and mixing functional fibers; S2. mixing the high-liquid-absorption viscose fibers and the functional fibers in proportion, carding the mixed fibers into single fiber state through a carding process, and cross-laying to form a fiber web; S3. forming a unique fiber distribution structure through a multi-stage spunlace process, and applying ultrasonic vibration in the spunlace process; and S4. performing hydrophilic treatment on the base cloth after spunlace. By adding hydrophilic nanoparticles in viscose spinning liquid and adopting a dry-wet spinning process, high-liquid-absorption viscose fibers with a multi-leaf structure are prepared, the specific surface area is increased, the liquid absorption capacity of the mask base cloth is further improved, the mask base cloth can fully absorb and carry essence liquid, and the demand of consumers for the skin care effect of the mask is met.

A filter substrate and adhesive filter rod manufacturing process having a plurality of connected adhesive regions or adhesive mechanisms throughout the filter substrate or other biodegradable material (single or multi-fiber), which can improve substrate performance regardless of whether the paper / substrate is curled, embossed, or not, and can be used as a filter rod. Including mechanical strength, filtration capacity for vapor / gas and particulate / solid phases, tar, nicotine and in particular carbon monoxide, sensory neutrality, visual improvement before and after use, and processability of the substrate.

To provide a carbon fiber bundle and a method for manufacturing a carbon fiber bundle that can exhibit high strength without reducing the elastic modulus, even when the diameter of the single fiber is increased. [Solution] A carbon fiber bundle in which multiple carbon fiber single fibers are bundled together, wherein the diameter of the single fibers is 6.5 μm or more and 8.5 μm or less, the strand strength is 4.5 GPa or more, and the strand modulus is 310 GPa or more, or a carbon fiber bundle in which multiple carbon fiber single fibers are bundled together, wherein the diameter of the single fibers is 6.5 μm or more and 8.5 μm or less, the strand strength is 4.5 GPa or more, and the product of the diameter of the single fiber and the strand strength is 31 or more.

The present application provides a kind of composite textile filament for fiber reinforced thermoplastic plastic when manufacturing FRP, the formed body that can obtain sufficient inhibition of the orientation disorder of continuous reinforcing fiber, further, the thermoplastic resin that melts is easily penetrated in the single fiber between the continuous reinforcing fiber constituting the core when manufacturing formed body, good formability, the strength of the obtained formed body is high.A kind of composite textile filament for fiber reinforced thermoplastic plastic, characterized in that, on the substantially untwisted fiber bundle formed by at least containing the core (A) of continuous reinforcing fiber (a1) and the sheath (B) formed by thermoplastic short fiber, textile filament (C) is wound by thermoplastic short fiber.

The present disclosure provides a kind of nanofiber thermal conductivity measuring device, the measuring device includes: middle hollow base, first and second side wall are formed around the hollow place and oppositely arranged third and fourth side wall;Two conductive electrodes are formed on the first and second side wall respectively;And support layer, adhesive layer and suspension electrode are sequentially stacked from bottom to top, the suspension electrode is supported on the first and second side wall by support layer, current is applied to the suspension electrode by two conductive electrodes to make it as hot end, the thermal resistance of suspension electrode is greater than the thermal resistance of the nanofiber to be measured, and the two ends of nanofiber are supported on the suspension electrode and the fourth side wall respectively.The suspension electrode in the present disclosure has the characteristics of long electrode length and small current flow area, so it has much greater thermal resistance than conventional single fiber measuring device, and can solve the problem of low signal-to-noise ratio in low thermal conductivity nanofiber thermal conductivity measurement.

The invention discloses a single-fiber vector stress-strain sensor based on a process of coating and plating a solid and liquid double-metal layer on the surface of a spandex fiber, which comprises the spandex fiber as a matrix, a lower electrode layer deposited on the surface of the matrix, an upper electrode layer deposited on the lower electrode layer, and the matrix, the lower electrode layer and the lower electrode layer are packaged through a flexible packaging layer; the lower electrode layer is gold nanoparticles attached to the substrate, the upper electrode layer comprises a metal nickel-plated layer on the lower electrode layer and a liquid metal layer coated on the metal nickel-plated layer, and the flexible packaging layer is made of chitosan. According to the invention, the problem of irreversible conductivity degradation caused by repeated stretching of the existing sensor is solved. The invention further discloses a preparation method of the single-fiber vector stress-strain sensor based on the process of coating the surface of the spandex fiber with the solid and liquid double metal layers.

The invention relates to divisional applications of an FDY (Fully Drawn Yarn) oiling agent capable of directly oiling crude oil, a preparation method and a spinning device, wherein the application number of the FDY oiling agent is 202510866489.9. The invention provides a spinning device which comprises an oil guide device used for coating a plurality of single fibers or yarns formed by the single fibers with the FDY oil capable of being directly oiled by the crude oil. According to the oiling agent guiding device, the influence of the number of fibers on oiling uniformity is reduced by conducting structure optimization on the oiling agent guiding device, the situation of yarn breakage in production is further reduced, and the problem that the quality of a traditional antistatic agent is unstable due to humidity fluctuation is solved.

The invention provides a method and system for regenerating fibers from waste textiles, and relates to the technical field of textile equipment. The method comprises the following steps: firstly, slitting a waste textile raw material through a vertical crossing slitting unit to obtain a cloth piece with a preset size; then, auxiliary agent spraying and steam ageing treatment are carried out on the cloth pieces, so that cohesive force between fibers is reduced; then carrying out flexible pretreatment, gradually loosening a warp and weft yarn structure through a needling device, and carrying out preliminary opening; then, through the multi-stage opening and impurity removal step, the materials are converted into a single fiber state in combination with a material distribution mechanism; the fibers are atomized and humidified in the conveying or storage process so as to maintain the water content and the strength; then fully carding through a carding and fiber separating machine, and separating the single fibers into at least three types of long fibers, medium and short fibers and ultra-short fiber components according to the difference between the fiber length and aerodynamic characteristics; and finally, respectively collecting and packaging the fibers with different length components. According to the invention, high-valued cyclic utilization of the waste textiles is realized.

The application discloses a kind of limestone powder replaces silica fume's ultra-high performance concrete interface enhancement evaluation method, belongs to cement-based composite material proportioning design and performance evaluation technical field.The application first establishes the benchmark cementitious material matrix system containing silica fume, and sets up limestone powder gradient replacement group to silica fume;Through 28d matrix compressive strength to different replacement ratio test piece group is pre-screened with strength, selects representative replacement group;The 100h cumulative heat release of representative replacement group, 28d total porosity, single steel fiber peak pullout load and single fiber pullout work are determined, constructs hydration response coefficient, pore structure density coefficient, peak bearing coefficient and energy dissipation coefficient, establishes the coupling determination method of interface enhancement index IEI and strength constraint coefficient Kc;According to IEI and Kc output candidate enhancement group, optimal replacement group and corresponding replacement ratio.The application can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious system.

A split type composite fiber containing a polymer A and a polymer B, in a fiber cross section, the polymer A is continuously distributed, the polymer B is split into large split pieces and small split pieces, and all split pieces are exposed on the fiber surface; the single fiber cross section has 1 to 3 maximum split pieces with the same area, and more than 2 small split pieces with smaller area than the maximum split piece; the area of the single maximum split piece accounts for 7.5 to 70.0% of the fiber cross section area, and the area of the single maximum split piece is more than 2 times the area of the single small split piece. The initial split rate of the split type composite fiber is low, and after physical treatment such as hot water without using chemical agents, it can be effectively split, and after splitting, it is fluffy and soft.

A basketball net includes a multi-layer cord including each of an outer layer formed of a first antimicrobial, moisture wicking fiber and an inner layer including a second antimicrobial, moisture wicking fiber. The outer layer is woven from a first antimicrobial, moisture wicking yarn to form a wall that defines a central opening, and at least one cord is located within the central opening, the at least one cord formed by a second antimicrobial, moisture wicking yarn. The at least one cord includes a plurality of cords including a first cord formed by the second antimicrobial, moisture wicking yarn and a second cord including a third antimicrobial, moisture wicking yarn. The plurality of cords includes: the first cord; the second cord including the third antimicrobial, moisture wicking yarn and at least one monofiber yarn; and a third cord formed by a plurality of mono fiber yarns.

A Mohr yarn includes a core yarn and a plurality of fancy yarns held by the core yarn, the core yarn including a plurality of first long fibers, each of the first long fibers having a single fiber fineness of 0.3 dtex to 5.0 dtex, each of the fancy yarns including a plurality of second long fibers having a single fiber fineness of 0.3 dtex to 8.0 dtex, each of the fancy yarns having a fixed portion held by the core yarn, and each of the fancy yarns including a plurality of second long fibers having a single fiber fineness of 0.3 dtex to 8.0 dtex, each of the second long fibers having a single fiber fineness of 0.3 dtex to 8.0 dtex, and each of the fancy yarns having a fixed portion held by the core yarn. When the slender direction of the Mohr yarn and the long side direction of each fancy yarn face in the horizontal direction, the Mohr yarn and the fancy yarn face each other. The linear distance between the core yarn and the front end of each second long fiber is set as the height T1 of each second long fiber; if the linear distance between the core yarn and the tip of each of the second long fibers when each of the second long fibers is stretched so as to be linear in a direction orthogonal to the direction in which the moire yarn is elongated is defined as the height T2 of each of the second long fibers, the ratio of the height T1 to the height T2, i.e., height T1 / height T2, is 0.88 or more.

The invention relates to a combined experiment method for improving ECC performance test success probability, and belongs to the technical field of civil engineering material test and design. Aiming at the problems of low trial and error efficiency, large discreteness of experimental results and the like in the research and development of the existing high-strength and ultrahigh-ductility engineering cementitious composites (ECC), the invention provides a closed-loop experimental system based on the combination of micromechanics matching screening and macroscopic accurate verification. The method mainly comprises two stages: in a screening stage (step 1), respectively through a pure matrix three-point bending experiment and a single fiber bundle drawing experiment, acquiring matrix fracture toughness and interface bonding strength parameters, verifying an energy matching relationship according to a micromechanics criterion, if the energy matching relationship is not matched, feeding back and guiding fiber modification or matrix adjustment, and if the energy matching relationship is not matched, feeding back and guiding the interface bonding strength parameters; reverse design and pre-screening of the mix proportion are realized; in the verification stage (step 2), a special dumbbell test piece designed with a specific long scale distance (80mm effective observation area) is adopted to perform a uniaxial tensile test on the all-component material meeting the matching requirement, and end damage interference is avoided. By applying the method, the research and development period can be shortened by 40% or above, the high-performance ECC with the compressive strength larger than 135 MPa, the tensile strength larger than 10.0 MPa and the tensile strain capacity of 10%-12% is successfully guided, prepared and verified, and the test success rate and the data authenticity are remarkably improved.

The invention provides a single fiber winding device which enables bobbin replacement work to be fully efficient. Wherein the circumferential winding unit (40) is provided with: a replacement cartridge (70) capable of supporting a plurality of bobbins (45) and having a fiber bundle guide (75) for guiding a plurality of fiber bundles pulled out from the plurality of bobbins to the circumferential surface of the sleeve; and a main body part (41) which supports the replacement box in a freely detachable manner and supports the installed replacement box in a rotatable manner around the shaft of the sleeve. The replacement cartridge has: a first portion (71) in which a first opening (71a) that constitutes a passage hole (44) is formed, and a plurality of bobbin holders (43) that rotatably support each of a plurality of bobbins are provided around the first opening; a second portion (74) which is separated from the first portion along the axial direction of the sleeve and is arranged side by side, in which a second opening (74a) that constitutes a passage hole is formed, and in which a fiber bundle guide (75) is arranged; and a connecting member connecting the first portion and the second portion.

The invention discloses a method for testing interfacial shear strength of a single fiber. The method comprises the following steps: step 1, preparing a sample from the single fiber and resin liquid drops in the vertical direction by adopting a sample preparation tool; and 2, testing the interfacial shear strength of the sample prepared in the step 1. According to the method, the viscosity and the surface tension of the resin are utilized, the fiber is stretched in the vertical direction and then compounded with the resin liquid drop, then the tensile stress is applied in the vertical direction, the interfacial shear strength is represented by measuring the force of the fiber for pulling out the resin liquid drop, the influence of a cutter on a test result is avoided, the sample preparation process is simple, and the data dispersity is small.

This invention discloses a method for constructing a ductile concrete bridging force model considering the randomness of fiber pull-out, belonging to the field of model construction technology. The method involves modeling and calculating the number of fibers in a cross-section; randomly assigning embedment depth and angle to each fiber; obtaining random distribution parameters of characteristic values ​​for each fiber; generating a simplified pull-out curve model for each fiber; establishing a fiber truncation algorithm; superimposing the pull-out curves of single fibers to establish a fiber bridging force model with randomness in single fiber pull-out; and applying the bridging force model. This construction method introduces randomness into single fiber pull-out, calculates the number of fibers in the cross-section and the fiber breakage rate to fit the pull-out curve of a single fiber, and sequentially superimposes the pull-out curves of all fibers on the cross-section according to the minimum step size of data acquisition, establishing a random bridging force model based on a three-segment line of single fiber pull-out. The analysis results show strong consistency with experimental data, making it suitable for guiding the design and optimization of the macroscopic properties of composite materials.

The purpose of the present invention is to provide a carbon fiber bundle capable of efficiently exhibiting the tensile strength of carbon fibers when made into a carbon fiber-reinforced composite material. The present invention relates to a carbon fiber bundle containing a sizing agent, the wire harness strength (wire harness strength A ') evaluated on the basis of JIS R7608 (2007) is 5.9 GPa or more, the wire harness strength (wire harness strength B') evaluated by changing the resin formula in JIS R7608 (2007) to Araldite (registered trademark) LY1564 SP CI / Baxxodur (registered trademark) EC331 is 5.7 GPa or more, the ratio of the wire harness strength B 'to the wire harness strength A' is 90% or more, the single fiber diameter is 5.1 or more and less than 6.0 [mu] m, and the interfacial shear strength is 16 MPa or less.

The application provides a kind of core-shell structure wear-resistant super-hydrophobic yarn and its preparation device and preparation method, and the super-hydrophobic functionalization treatment of yarn is completed in single bath at room temperature. The core-shell structure wear-resistant super-hydrophobic yarn includes fiber substrate A and super-hydrophobic shell B covalently bonded to the surface of fiber substrate, and the super-hydrophobic shell B is a core-shell structure. The preparation device of the core-shell structure wear-resistant super-hydrophobic yarn includes a pay-off end, a super-hydrophobic treatment liquid immersion tank, a humid air reaction chamber and a drying chamber. The application realizes continuous production, and the yarn passes through the treatment line at a stable speed, and the coating deposition and curing can be completed within a few seconds. The fiber-level core-shell super-hydrophobic coating forms a covalent interface between the fiber and the coating with high bonding force, significantly improving the durability and mechanical stability of the hydrophobic coating. Since the shell thickness is only on the order of nanometers and is distributed on the surface of the single fiber without blocking the fabric pores, the air permeability and softness of the treated fabric are basically not affected.

The invention discloses degradable air filter cotton and a preparation method thereof, and belongs to the technical field of air filter cotton, the preparation method comprises the following steps: mixing a first degradable fiber with the fiber fineness of X, a first degradable fiber with the fiber fineness of Y and a second degradable fiber with the fiber fineness of Z. The preparation method comprises the following steps: mixing the first degradable fiber with the fiber fineness of X, the first degradable fiber with the fiber fineness of Y and the second degradable fiber with the fiber fineness of Z. The mass ratio of the first degradable fiber to the second degradable fiber is (80-90): (10-20), and X is more than Z and less than Y; opening the first fiber raw material to obtain a second fiber raw material; processing the second fiber raw material into uniform sheet cotton; carding the sheet cotton into single fibers, forming a fiber net by using the single fibers, and carrying out reinforcement, shaping and surface treatment on the fiber net to obtain the degradable air filter cotton. Through fiber formula design and addition of the degradable fibers, on the basis of maintaining existing filtering performance and mechanical performance, the environment-friendly performance is improved, and the problems that existing air filtering cotton is poor in environment-friendly performance, single in function and contradictory in performance are solved.