104 results about "Ramie" patented technology

The invention provides a fibrilia polypropylene composite material and a preparation method thereof. The composite material is formed by compounding the following components in percentage by weight: 30-50% of modified fibrilia, 30-50% of PP (polypropylene) fiber, 5-15% of PET (polyethylene terephthalate) fiber and 5-15% of GMT (glass mat reinforced plastics) board. The modified fibrilia is sprayed with a surface treatment solution containing a polycarboxylic derivative and metal ions, and a gel film is formed in a sodium alginate solution, so that the interfacial compatibility is improved. The PP fibers are subjected to surface grafting treatment so as to improve the binding force with other components. The GMT board is composed of polypropylene, glass fibers, an impregnating compound and a thermoelastomer, and the performance of the GMT board is optimized by adopting a specific preparation method. The preparation method of the composite material comprises the steps of opening, carding, needling, pressing and the like, and finally annealing treatment is carried out to improve the stability. The composite material has the advantages of light weight and excellent mechanical properties.

1. Name of the designed product: accessory pendant (ramie leaf). 2. Use of the designed product: for accessory pendant, etc. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

The present application relates to a strain of Inhernia Bacillus and its application in ramie degumming, the strain is preserved in Guangdong Microbial Culture Collection Center on September 15, 2025, and the preservation number is GDMCC NO: 66966. When the strain is applied to ramie degumming, the degumming reaction can be carried out at a higher temperature, the degumming efficiency of ramie is effectively improved, the fiber is not damaged, the quality of the fiber is improved, and the strain has high application value in ramie degumming.

The invention relates to the technical field of genetic engineering and molecular breeding, in particular to a ramie MYB transcription factor and application thereof. The MYB transcription factor is BnMYB6, the amino acid sequence of the MYB transcription factor is as shown in SEQ ID NO.1, and the gene sequence for coding the amino acid of the MYB transcription factor is as shown in SEQ ID NO.2. The transcription factor protein BnMYB6 can specifically and negatively regulate the biosynthesis of plant lignin, and has application value in the aspects of inhibiting the synthesis of plant lignin, promoting the growth and development of a root system and maintaining related traits such as the activity of the root system under drought stress.

The present invention provides a sinapinic acid plant growth regulator and its application. The sinapinic acid plant growth regulator is used to alleviate the continuous cropping disorder of ramie plants. The raw materials include, by weight, 10 to 30 parts of sinapinic acid and 1 to 3 parts of a slow-release solvent. The pH value of the sinapinic acid plant growth regulator is 5.0 to 7.0. The sinapinic acid plant growth regulator provided in this application reduces the damage of continuous cropping to ramie plants and improves related indicators such as plant agronomic traits, root vitality, chlorophyll content, and antioxidant system enzyme activity. This preliminarily reveals a new cultivation technology for alleviating soil damage caused by continuous cropping of ramie.

The invention discloses a renewable ramie fiber / wool blended fabric and an environment-friendly dyeing and finishing process thereof, and belongs to the technical field of textile fabrics. The renewable ramie fiber / wool blended fabric is prepared from, by mass, 30%-50% of renewable ramie fibers, 25%-40% of wool fibers, 15%-30% of regenerated cellulose fibers and 0.5%-3% of functional auxiliaries, the ramie fibers are derived from recycled products, and the auxiliaries contain antibacterial agents and anti-wrinkle agents. During preparation, fibers are subjected to ultrasonic pretreatment, spinning and weaving to obtain grey cloth; the dyeing and finishing adopts biological enzyme desizing, hydrogen peroxide bleaching, natural vegetable dye dyeing and formaldehyde-free color fixation. The antibacterial rate of the fabric is larger than or equal to 90%, the anti-wrinkle recovery angle is larger than or equal to 280 degrees, the COD of dyeing and finishing wastewater is smaller than or equal to 400 mg / L, formaldehyde residues are avoided, energy consumption is low, excellent performance and environmental friendliness are both considered, and the method is suitable for the field of spinning.

The invention relates to a fabric based on a long fiber and wool short fiber composite material and a preparation method thereof, the fabric comprises the following components by weight: 40-55 parts of modified wool short fiber-ramie long fiber, 5-12 parts of silk long fiber, 12-20 parts of bamboo short fiber, and 25-35 parts of acrylic long fiber; wherein a method for obtaining the modified wool short fiber-ramie long fiber comprises the following steps: uniformly mixing the ramie long fiber pretreated by an acrylamide-citric acid mixed solution with the wool short fiber to obtain a mixed fiber, and soaking the mixed fiber into an enzymolysis solution to carry out an enzymolysis reaction. According to the invention, an acrylamide-citric acid mixed solution is used for pre-treating ramie long fibers, xylanase, protease and TG enzyme are matched for carrying out enzymolysis reaction on the pre-treated ramie long fibers and wool short fibers to prepare modified wool short fiber-ramie long fibers, and the modified wool short fiber-ramie long fibers are added into a fiber system of the composite fabric; the wear resistance, the wrinkle resistance and the perspiration-resistant color fastness of the fabric can be obviously improved.

The utility model discloses a soft anti-sticking knitted fabric, which relates to the technical field of textiles, and is characterized in that a plurality of moisture guiding pieces are arranged between an inner layer and an outer layer, the hygroscopicity of the moisture guiding pieces is larger than that of the inner layer and is the same as that of the outer layer, and a plurality of breathable spaces are enclosed among the moisture guiding pieces, the inner layer and the outer layer. The end face, away from the inner layer, of the moisture guiding piece is provided with a plurality of ventilation grooves communicating with the ventilation spaces, and the outer layer is provided with a plurality of ventilation holes communicating with the ventilation grooves in a penetrating mode. According to the fabric, water in the fabric can be dispersed in time through the outer layer made of the ramie fibers due to the good moisture dissipation performance of the ramie fibers, the inner layer made of the cotton fibers has the soft touch feeling, the air circulation effect in the fabric is improved through the ventilation holes, the ventilation spaces and the ventilation grooves which are communicated with one another, and the moisture dissipation performance of the fabric is further enhanced.

The present invention relates to a Lactobacillus plantarum strain and its use in the co-production of fiber and lactic acid from ramie, belonging to the field of microbial technology. The present invention provides Lactobacillus plantarum strain Y-16, which was deposited with the China Center for Type Culture Collection on October 25, 2024, with a deposit number of CCTCC No. M 20242334. Ramie enzymatic hydrolysate can be used as a raw material to convert soluble sugars therein into lactic acid with high conversion efficiency.

The utility model discloses a microbial degumming device for ramie fiber manufacturing, including processing jar, and the processing jar opening end is equipped with the apron through the connecting component, is equipped with the feeding pipe on the apron, and the sidewall of processing jar is connected with the apron through the lifting assembly, and the middle part of apron is equipped with the rotating component, and the both sides symmetry of apron are equipped with the adjusting mechanism matched with rotating component, and still be equipped with the clamping assembly in rotating component. The utility model connects through the adjusting mechanism between upper clamping plate and lower guide plate, and after adjusting motor adjusts the position through the second electric push rod, can drive the rotation of screw rod, drives the movement of lower guide plate relative upper clamping plate, and in the moving process, through the clamping assembly in lower guide plate, the ramie fiber is guided carding, avoids the fiber reunion and winding, and through the clamping of upper and lower clamping plate simultaneously, reduces the risk of fiber winding when rotating and mixing, provides the convenience for subsequent carding, spinning and other processing procedures.

The application discloses a ramie bio-enzyme steaming pile degumming method and belongs to the technical field of ramie fiber degumming process methods. The method comprises the following steps: immersing pressed ramie raw fibers into a broken wall pretreatment liquid, taking out the ramie raw fibers for steaming pile treatment, adding the ramie raw fibers into a pectinase degumming liquid after knocking and washing, taking out the ramie raw fibers for steaming pile treatment, then adding the ramie raw fibers into a chlorine-free bleaching liquid for bleaching, washing, oiling and drying. The method solves the problems of low utilization rate and high degumming cost caused by a large bath during treatment through steaming pile treatment. Compared with a traditional chemical degumming process, the method has a shorter time consumption, lower nitrogen and phosphorus content and COD value in waste liquid, and the obtained fine dry fibers are finer, softer and stronger, the surface fluff of spun ramie cloth is less, and the itching feeling after wearing is reduced.

The application discloses a ramie fiber diaphragm based on fiber crystalline domain entropy regulation and a preparation method and application thereof, and belongs to the technical field of preparation of cellulose diaphragms for capacitors. The preparation method comprises the following steps: pretreating ramie raw materials by soaking, cooking and cutting to obtain ramie sections, then performing low-temperature beating to maintain high crystallinity of the fibers and realize refinement, forming a suspension slurry, then performing ultrasonic dispersion, screening and dissociation dispersion to obtain uniform fine slurry, and finally performing wet laying molding and freeze drying to obtain the ramie fiber diaphragm which has a three-dimensional interconnected porous structure and high tough mechanical properties. The application fully utilizes the alkaloid characteristics of the ramie fiber to realize alkali-free cooking, and the process is environmentally friendly. Through the synergistic effect of low-temperature beating and freeze drying, the fiber intrinsic toughness is maintained while the multi-stage ion transmission channel is constructed. The obtained diaphragm has excellent air permeability, porosity and mechanical strength.

The invention relates to the technical field of paper ink, and discloses polyester-based decorative paper ink and a preparation method thereof.The preparation method comprises the following steps that S1, ramie fibers are pretreated; s3, in a nitrogen atmosphere, adding itaconic acid, phthalic anhydride and 1, 6-hexanediol into a reactor, stirring and mixing, continuously adding p-toluenesulfonic acid and hydroquinone, ending the reaction until no water is generated, then adding dibutyltin dilaurate, and carrying out reduced pressure reaction to obtain unsaturated polyester; s4, adding unsaturated polyester, the modified ramie fiber and hydrogen-containing silicone oil into a reactor, stirring and mixing, adding a platinum catalyst, and reacting to obtain a polyester-based intermediate; and S5, adding water-based acrylic resin, the polyester-based intermediate, a flatting agent and a dispersing agent into the reactor, and stirring to obtain the polyester-based decorative paper ink. The polyester-based decorative paper ink provided by the invention has good adhesive force, water resistance and wear resistance.

A kind of microscopic detection method for detecting quality of moxa, comprising the following steps: S1, photographic calculation;S2, sieving;S4, dyeing;S5, making slice ’ ;S6, obtaining stem retention: dividing average area S ’ By average width W0 in step S1, the average length of stem of sieved moxa is obtained, and slice is made three times for each batch of sample, measurement and calculation are carried out, and the final average length L ’ Is obtained by three results, stem retention Y=L ’ / L 0 ×100%, stem retention Y is maximum 60%, the smaller stem retention Y is, the worse quality is indicated.The method is simple, convenient to operate, low in detection cost, small in workload, high in efficiency, good in detection effect, effectively used for microscopic detection method for detecting quality of moxa, the purpose of detecting moxa processing quality is achieved, and there are significant social and economic benefits.

The application relates to the technical field of textiles, and particularly discloses an anti-mosquito and antibacterial fabric and a hunting jacket. The anti-mosquito and antibacterial fabric comprises a base cloth layer, an anti-mosquito and antibacterial layer arranged on one side of the base cloth layer, and an inner layer arranged on the side, away from the base cloth layer, of the anti-mosquito and antibacterial layer. The base cloth layer comprises 240-380 parts of base fibers and 30-50 parts of functional components by weight; the anti-mosquito and antibacterial layer comprises 150-250 parts of antibacterial fibers and 100-150 parts of anti-mosquito fibers; and the inner layer comprises 100-200 parts of warm-keeping carbon fibers, 50-100 parts of ramie fibers and 20-50 parts of ceramic powder fibers. The anti-mosquito fabric has excellent and long-lasting anti-mosquito and antibacterial effects. In addition, the hunting jacket is made of the anti-mosquito and antibacterial fabric, has excellent anti-mosquito and antibacterial performance, and has long-lasting anti-mosquito and antibacterial effects.

The application provides a special plastic aluminum foil composite paper and a preparation method thereof. The composite paper comprises an aluminum foil layer, a special plastic layer and a paper layer. The aluminum foil layer is a base layer, the special plastic layer is made of polyimide, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, ethylene-vinyl alcohol copolymer and nano magnetic particle microcapsules, and is tightly attached to one side of the aluminum foil layer; the paper layer is made of raw paper wood pulp, polyester fiber pulp, ramie fiber pulp, silk fiber pulp, rosin glue, chitin, chitosan, allicin and bee glue, and is combined with the special plastic layer on the other side of the aluminum foil layer. The nano magnetic particle microcapsules are made of magnetic nano particles, capsule core materials, monomers and emulsifiers. The paper layer is formed by mixing two kinds of pulp uniformly and electrophoretic deposition. During preparation, the surface of the aluminum foil layer is pretreated, then the special plastic is prepared, the special plastic layer is coated, the paper layer is coated, and the finished product is obtained through hot pressing, and can be applied to the field of food packaging.

The invention belongs to the technical field of plant propagation, and particularly relates to a propagation method for improving the cutting rooting rate of pueraria lobata, which comprises the following steps: pruning mother branches of pueraria lobata to obtain cutting slips, and disinfecting the cutting slips to obtain disinfected cutting slips; the disinfected cutting slips are treated with a growth regulator, and the cutting slips treated with the growth regulator are obtained; and inserting the cutting slips treated by the growth regulator into a seedbed matrix, and carrying out cuttage culture to obtain pueraria lobata breeding seedlings. According to the method, stems of leguminous plant pueraria lobata are used as raw materials, a cuttage vegetative propagation mode is adopted, and the rooting rate of pueraria lobata cuttage propagation is increased by selecting a plurality of key parameters such as proper types and concentrations of growth regulators and controlling treatment time. Results show that the rooting rate of pueraria lobata cutting propagation can be remarkably increased by using the mixed growth regulator for treatment. The method is simple, convenient, feasible and environment-friendly, can effectively promote the large-scale breeding of the pueraria lobata excellent germplasm material, and has a wide application prospect.

The application discloses a kind of footpath antiskid asphalt blanket and preparation method thereof in the technical field of road asphalt, including the following weight parts of components: a kind of footpath antiskid asphalt blanket, the footpath antiskid asphalt blanket includes base cloth, antiskid asphalt material, single silicon mucosa;The surface of the single silicon mucosa is coated with a layer of silicon oil to isolate the adhesion of PET film surface and antiskid asphalt material.The application proposes to prepare antiskid asphalt material, by preparing modified ramie fiber and epoxy resin modified curing agent, both are compounded, and supplemented by adding antiskid particles, both improve the mechanical properties of asphalt pavement, and achieve better skid resistance, and the addition of modified ramie fiber is green and environment-friendly.

The invention relates to a friction-wear-resistant environment-friendly HDPE (high-density polyethylene) composite material as well as a preparation method and application thereof. The friction-wear-resistant environment-friendly HDPE composite material comprises 100 parts of high-density polyethylene, 20-30 parts of organic modified glass fibers, 25-35 parts of ramie fibers, 2-5 parts of nano clay, 6-8 parts of color masterbatch, 1-3 parts of a lubricant and 0.5-1.5 parts of a compound antioxidant, through organic modification of the glass fibers and combination of the ramie fibers, the glass fibers and ultrafine micropore structures of the ramie fibers can form an intertwined net structure, the composite structure reserves the advantages of a single reinforcing material, meanwhile, the nano clay is introduced as an interface compatilizer of an HDPE matrix, the design capacity of the composite material is improved, and the composite material has the advantages of being high in mechanical strength, high in mechanical strength and the like. The modified HDPE composite material has the advantages that rigidity enhancement and friction and wear resistance improvement which cannot be achieved by a single reinforcing material are achieved, the long-term stability problem of the HDPE material in a complex medium conveying environment is solved, the modified HDPE composite material has unique and comprehensive performance, and the application range of the HDPE material is widened.

The application provides a composition for preventing and treating bacterial leaf streak of rice and a preparation method thereof, and relates to the technical field of agriculture.The composition is composed of the following components in a mass ratio: ramie extract: camphor tree leaf extract = 5-8:1-2;wherein the ramie extract is obtained by adjusting the alcohol content of a ramie water extract solution to 25-35%, discarding the precipitate, then adjusting the alcohol content of the ramie water extract solution to 50-55% again, and collecting and drying the precipitate; and the camphor tree leaf extract is obtained by fermenting camphor tree leaves with papain.The composition effectively improves the current situation that the prevention and treatment effect of existing chemical agents on bacterial leaf streak of rice is not ideal, and has the remarkable characteristics of being economical, environmentally friendly, and excellent in prevention and treatment effect, and has important positive significance for promoting the prevention and treatment of bacterial leaf streak of rice.

The application relates to the construction field, in particular to anti-permeation concrete and a filter tank V-shaped groove construction method using the concrete. The anti-permeation concrete comprises the following raw materials in parts by mass: 140-150 parts of water, 360-370 parts of cement, 1200-1300 parts of coarse aggregate, 600-650 parts of fine aggregate, 30-70 parts of gneiss stone powder, 0.3-1.5 parts of sodium alginate, 2-6 parts of ramie fiber and 1-5 parts of water reducing agent. The filter tank V-shaped groove construction method using the concrete comprises the following steps: pouring concrete vertical wall; reinforcing bar binding; supporting and erecting and installing the inclined plate formwork, and horizontally arranging a reserved pipe at the bottom of the inclined plate formwork; preparing the anti-permeation concrete, and then pouring the anti-permeation concrete along the inclined plate formwork; removing the inclined plate formwork, taking out the reserved pipe and burying a sweeping pipe at the reserved position. The application has the advantage of improving the anti-permeation capacity of the inclined plate.

The present invention discloses a degradable polypropylene carbonate resin and a preparation method thereof. The resin is prepared by weight from 40-80 parts of modified polypropylene carbonate, 10-30 parts of modified ramie fiber, 10-30 parts of gelatinized starch masterbatch, and 0.5 parts of an auxiliary agent; wherein the polypropylene carbonate is modified with methacrylic acid; and the modified ramie fiber is modified with mercaptopropyltriethoxysilane. The terminal hydroxyl groups of the polypropylene carbonate are capped, an acrylate double bond is introduced, and the surface of the ramie fiber is functionalized by a mercapto-double bond click chemistry reaction. The ramie fiber is then cross-linked to the polypropylene carbonate resin molecules by chemical bonding, thereby improving the low interchain interaction force, low glass transition temperature, and poor thermal stability of the PPC molecular chain, thereby forming a modified material with good compatibility and excellent macroscopic performance.

The application discloses high-toughness and high-bonding C80-strength fiber concrete and a preparation method thereof. A concrete mixing ratio comprises cement, river sand, gravel, fly ash, straw ash, silica fume, nano silicon, water, water reducing agent, activator, defoaming agent, shrinkage reducing agent, ramie fiber, basalt fiber and CaCO3 whisker, and the concrete mixing ratio is 360-370:725:1007:100-110:55-65:17-19:2.5-4:150-155:8.5-9.5:12.5-13.5:1.8-2.1:7.8-8.2:4.9-5.2:8.1-8.3:17.4-17.6. The materials are uniformly mixed by a layered mixing method, and then discharged, molded and maintained. The compressive strength, flexural strength, splitting tensile strength, toughness and durability of the concrete can be effectively improved, and the bonding strength and synergistic deformation capacity between the concrete and the profile steel can be enhanced.

This invention discloses a continuous zirconia fiber with an ionogel coating and its preparation method, belonging to the field of new continuous inorganic ceramic fiber technology. The ionogel coating, formed by the rapid polymerization of ramie fibers modified with a coupling agent using a eutectic solvent under UV light, effectively protects the fibers while maintaining their thinness, uniform thickness, and flexibility. It imparts a certain degree of self-lubricating property to the fibers, thereby reducing frictional damage during the weaving process of continuous zirconia fibers. Simultaneously, this ionogel coating possesses excellent mechanical properties and self-healing capabilities, is not easily peeled off from the fibers, improves the wear resistance of zirconia fibers, and enhances the stability of products in three-dimensional weaves, demonstrating significant commercial value.

This invention relates to a method for identifying ramie fibers and their mixed fibers based on long-lifetime room-temperature phosphorescence. The method establishes luminescence characteristic information for a lyocell fiber control sample, a ramie fiber control sample treated with a 15% NaOH solution, and a mixed fiber control sample of the two. The method acquires the fiber sample to be tested and prepares it as a test sample. The photoluminescence emission spectrum of the test sample is acquired under 365 nm excitation conditions to obtain emission peak position information. After UV excitation stops, the long-lifetime room-temperature phosphorescence decay information of the test sample is acquired to obtain lifetime information. The emission peak position information and lifetime information are compared with the corresponding information of the control sample to identify whether the fiber sample to be tested is ramie fiber or a mixture of lyocell and ramie fibers. This invention utilizes the differences in photoluminescence and long-lifetime room-temperature phosphorescence caused by changes in the crystal structure of ramie fibers for identification, providing an auxiliary detection method based on luminescence characteristics for fiber composition identification.

The utility model relates to the technical field of ramie sorting, in particular to a ramie sorting manipulator based on flexible pneumatic driving, which comprises a primary telescopic cylinder and a clamping mechanism, the first-stage telescopic air cylinder is in driving connection with a second-stage telescopic air cylinder, the second-stage telescopic air cylinder is in driving connection with a connecting arm, a sleeve is arranged on the second-stage telescopic air cylinder, and a diffuse reflection sensor is arranged in the sleeve; the clamping mechanism comprises a fixing frame arranged on the connecting arm, two mounting blocks symmetrically distributed on the fixing frame, a rotating arm rotationally connected with the mounting blocks, a chuck arranged on the rotating arm, a three-stage telescopic air cylinder arranged in the connecting arm and a lifting plate in driving connection with the three-stage telescopic air cylinder. The two ends of the connecting rods are rotationally connected with the rotating arm and the lifting plate respectively. The clamping force can be adjusted according to the size of ramie stalks, damage to ramie fibers is reduced, and the practicability of the device is improved.

The present invention belongs to the field of biotechnology applications and relates to the use of a ramie glutathione synthetase gene in regulating plant drought resistance. The sequence of the ramie glutathione synthetase gene is shown in SEQ ID NO. 1. Results from the present invention show that under drought stress, Arabidopsis thaliana overexpressing BnGS exhibited higher root length, biomass, sodium content, and potassium content than wild-type plants, and exhibited significantly higher antioxidant enzyme activities, while MDA, H2O2, and AsA content were significantly lower than those of wild-type plants. This indicates that overexpressing BnGS in Arabidopsis thaliana can enhance antioxidant capacity, eliminate excess free radicals, and improve plant drought resistance.

The utility model discloses antibacterial jacquard cloth, which relates to the technical field of fabrics and is characterized by comprising an inner layer and an outer layer which are fixedly connected with each other, a plurality of flow guide grooves are formed in the end face, far away from the outer layer, of the inner layer, a plurality of first air holes are formed in the bottom of each flow guide groove, and a plurality of second air holes are formed in the bottom of each first air hole. The end face, close to the outer layer, of the inner layer is fixedly connected with a plurality of supporting blocks, the supporting blocks abut against the outer layer, a ventilation cavity is formed between the inner layer and the outer layer, the horizontal section of each supporting block is in a parallelogram shape, a plurality of second ventilation holes are formed in the inner layer, the second ventilation holes are located between the adjacent supporting blocks, and the first ventilation holes are communicated with the second ventilation holes. A plurality of third air holes are formed in the outer layer, and the first air holes, the second air holes and the third air holes are all communicated with the ventilation cavity. The ramie fibers and the natural bamboo fibers are arranged in the fabric, and the overall breathability and the bacteriostatic effect of the fabric are improved through the characteristics of breathability, moisture absorption and bacteriostasis of materials.

The invention discloses a Shangri-La curtain fabric made of natural materials and a preparation method of the Shangri-La curtain fabric, and particularly relates to the field of Shangri-La curtains. The natural material fabric is obtained by weaving one of the following five fiber raw materials in percentage by weight: a fiber raw material I: 70% of paper fiber and 30% of Bengal hemp fiber; a fiber raw material II: 50% of linen fiber and 50% of Manila hemp fiber; the third fiber raw material comprises 80% of linen fiber and 20% of ramie fiber and polyester cotton blended fiber; a fourth fiber raw material: 70% of paper fiber and 30% of ramie fiber; and a fiber raw material V: 100% of rose-bengal jute fibers. Sacrificial filaments with a shape memory effect or a strain hardening effect are introduced into a fiber system of a natural material blade strip, the sacrificial filaments, ground yarns and surface yarns form an integrated laminated structure, crack propagation and interface stripping are actively inhibited in the service process, and therefore the anti-fatigue capacity of the structure and the interface is improved.

The invention relates to the technical field of artificial composite fibers, and particularly discloses a composite fiber for a self-heating fabric and a preparation method of the composite fiber. The composite fiber is of a three-layer concentric circle composite structure and comprises an outer wrapping layer, a functional layer and an elastic core layer, the outer wrapping layer is formed by curing an outer wrapping layer spinning solution, and the outer wrapping layer spinning solution is prepared from, by mass, 50-70 parts of waterborne polyurethane, 15-20 parts of viscose, 15-30 parts of polyethylene glycol modified cotton pulp and water; the functional layer is formed by curing a functional layer spinning solution, and the functional layer spinning solution comprises 70-80 parts of preformed crosslinking slurry, 20-30 parts of silanized ramie fiber and water; the elastic core layer is formed by curing an elastic core layer spinning solution, and the elastic core layer spinning solution comprises 90-110 parts of a thermoplastic polyurethane elastomer and N, N-dimethylformamide. The composite fiber prepared by the invention has excellent self-heating performance, washability and mechanical properties.