186results about How to "High breaking strength" patented technology

The invention discloses carbon-dot-based high-moisture-content tough hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel. Specific carbon dots (hydroquinone carbon dots) are introduced, the hydroquinone carbon dots are used as nano-filler and are connected to a double-crosslinking network of sodium alginate / polyvinyl alcohol hydrogel through hydrogen bonds, effective crosslinking polymerization is promoted, and the hydrogel is prepared. The hydroquinone carbon dots are introduced, so that the conductivity can be improved, the mechanical property of the high-water-content hydrogel can be enhanced, the preparation process is simple, and the performance is excellent.

The invention discloses a method for preparing a polyester fabric through cyclic regeneration of waste polyester textiles, belongs to the technical field of polyester recovery, and is used for solving the technical problem that the mechanical property and antibacterial ability of a regenerated polyester fabric in the prior art need to be further improved. The method comprises the following steps: adding the waste polyester textile and modified multilayer graphene into a high-pressure reaction kettle, carrying out carbon dioxide supercritical depolymerization to obtain a depolymerized mixed solution, preparing the modified multilayer graphene, slowly releasing supercritical fluid by virtue of an abundant gap structure, and preparing the modified multilayer graphene into the high-pressure reaction kettle. According to the preparation method, modified multilayer graphene is modified, the depolymerization effect is improved, meanwhile, rich active functional groups on the surface provide in-situ polymerization sites for a depolymerization monomer, the depolymerization monomer serves as a polymerization hub structure to provide support for an organic chain segment, a space structure is hybridized through a chain extender, finally, the flame-retardant antibacterial liquid is prepared, effective components of the flame-retardant antibacterial liquid are cross-linked with the modified multilayer graphene, and the flame-retardant antibacterial performance is improved. In the combustion process, the chain extender is promoted to be carbonized, and the regenerated polyester fabric which is flame-retardant, antibacterial and excellent in mechanical property is obtained.

The invention relates to a polyorganosilicone cyclophosphazene modified epoxy resin and a preparation method thereof, and belongs to the field of flame retardant materials, and the preparation method of the polyorganosilicone cyclophosphazene flame retardant comprises the following steps: taking hexachlorotripolyphosphazene, p-hydroxybenzaldehyde, p-aminobenzoic acid, DOPO and diphenyl silanediol as raw materials, and carrying out four-step reaction to prepare the polyorganosilicone cyclophosphazene modified epoxy resin. The preparation method comprises the following steps: by taking m-phenylenediamine as a curing agent, adding the series gradient polyorganosilicone cyclophosphazene flame retardant into the epoxy resin, and curing twice to obtain the modified epoxy resin. The preparation method is mainly used for preparing the polyorganosilicone cyclophosphazene flame retardant and the polyorganosilicone cyclophosphazene modified epoxy resin.

The invention relates to the technical field of fibers, in particular to a PTT / PA eccentric core-sheath composite fiber and a preparation method thereof. The comprehensive performance of the fiber is remarkably improved through eccentric structure design and introduction of an alkyl chain into a PA sheath layer to modify PA. The composite fiber is composed of a PTT core layer and a PA sheath layer, the sheath layer contains alkyl chain modified PA, and the fiber shows excellent breaking strength, curling performance and thermal stability. The eccentric structure effectively disperses stress, brittle fracture is avoided, meanwhile, the alkyl chain modified PA enhances the flexibility and interface bonding force of a molecular chain, and the dimensional stability and thermal stability of the fiber are improved. The invention is suitable for the fields of clothing, home textiles and high-temperature industrial fibers, and meets the requirements of high strength, high elasticity and high-temperature stability.

The invention relates to the technical field of carbon materials, in particular to a preparation method and application of a heat conduction material and a maleic anhydride grafted graphene material.The preparation method comprises the steps that maleic anhydride and graphene are evenly mixed, and a prefabricated mixture is obtained; uniformly mixing the prefabricated mixture with a peroxy initiator, heating to react for a certain time, cleaning a product, and drying to obtain the maleic anhydride grafted graphene material. According to the preparation method, graphene is grafted with strong polar groups to serve as a connecting bridge between the graphene and a plastic matrix, so that the strong bonding capacity between the graphene and the plastic matrix is obtained, then the toughness, surface smoothness, breaking strength and other mechanical properties of the corresponding plastic heat-conducting composite material are improved, and meanwhile the heat-conducting property of the heat-conducting composite material is remarkably improved. In addition, maleic anhydride and graphene are directly mixed without the help of an organic solvent or a dispersing agent and the like, the process is simple and pollution-free, the environmental protection property is improved, and the complexity of the preparation process is reduced.

The invention relates to the technical field of lithium batteries, in particular to a method for improving the volume expansion effect of a silicon-based negative electrode. The preparation method comprises the following steps: firstly, preparing a porous carbon-coated silicon material by using an in-situ synthesis method, and then preparing the porous carbon-coated silicon material into a graphene-coated silicon material by using an electrostatic self-assembly method; and taking the graphene-coated silicon material as a negative electrode active material. Dissolving a negative electrode active material, acetylene black and polyvinylidene fluoride in an N-methyl pyrrolidone solvent to obtain negative electrode slurry; and coating the surface of a copper foil with the negative electrode slurry, and carrying out vacuum drying and cutting to obtain the negative electrode plate. The graphene-coated silicon material prepared by the invention can effectively improve the conductivity of the composite material and inhibit the volume expansion of the composite material in the charge-discharge process, thereby improving the electrochemical performance.

The invention discloses a self-twisting high-thermal-conductivity flexible graphene fiber and a preparation method thereof. Water is added into an organic-phase graphite oxide spinning solution, an organic phase and a water phase exist in the gel fiber in the solidification and drying process at the same time, the solvent concentration gradient and the surface tension gradient exist on the fiber surface due to the non-uniformity of the volatilization rate of a dual-phase solvent, and the non-uniformity causes the Mallangori effect and enables the gel fiber to generate rotary self-twisting. According to the method, controllable adjustment of the fiber twist can be realized by adjusting the water content of the initial spinning solution, and the self-twisted fiber is subjected to chemical reduction and graphitization treatment, so that the high-thermal-conductivity flexible graphene fiber can be obtained.

The invention belongs to the technical field of textile fabrics, and particularly relates to an ultraviolet-proof antibacterial fabric and a preparation method thereof. The ultraviolet-proof antibacterial fabric comprises a base cloth layer and a modified polyester fabric layer, the modified polyester fabric is obtained by dipping a polyester fabric in a finishing liquid; the finishing liquid comprises a first finishing liquid and a second finishing liquid; the first finishing liquid is prepared from the following raw materials: a carboxymethyl chitosan derivative and polycarboxylic acid; the second finishing liquid is prepared by mixing nano titanium dioxide and absolute ethyl alcohol. According to the invention, the pre-treated polyester fabric is subjected to secondary surface modification by using the finishing liquid, and the durability of the fabric product is remarkably improved by using a covalent grafting mode.

The present invention relates to the technical field of hollow fiber membranes, and to a PVDF hollow fiber membrane and a preparation method and use thereof. In the present invention, a nascent hollow fiber membrane having a hydrophilic photoinitiator molecular chain is subjected to ultraviolet irradiation to cause a cross-linking reaction to form a semi-interpenetrating structure, and a hydroxyl hydrophilic group is generated at the same time, so that the hydrophilicity and mechanical properties of the membrane are improved, the reaction degree is easy to control, and continuous operation can be achieved.

The present invention relates to the technical field of thermally conductive polyester films, and specifically to a flexible high thermal conductivity graphene-filled polyurethane composite film and a preparation method thereof. Conventional graphene-modified polyurethane thermally conductive films have good horizontal thermal conductivity, but poor vertical thermal conductivity. In view of the above problems, the present invention provides a flexible high thermal conductivity graphene-filled polyurethane composite film, wherein the material system contains graphene, carbon quantum dots and a one-dimensional film-forming agent at the same time, and the graphene, carbon quantum dots and the one-dimensional film-forming agent are interconnected, interspersed and stacked to form a complex three-dimensional network structure, and the filler particles are distributed more evenly and densely in the polyurethane resin matrix, which significantly improves the thermal conductivity of the obtained flexible high thermal conductivity graphene-filled polyurethane composite film.

The present invention relates to the field of cellulose technology, and discloses a high-strength cellulose acetate blended fiber fabric and a dyeing process thereof. The present invention grafts alkenyl-containing tris (β-maleic acid ethyl piperazine) phosphate and acrylonitrile with cellulose acetate under the initiation of ammonium persulfate to obtain polymer-grafted cellulose acetate, which is then blended with polyacrylonitrile to obtain cellulose acetate blended fiber and its fabric. After cellulose acetate is grafted with acrylonitrile monomer, the interface compatibility between cellulose acetate and polyacrylonitrile is better, and the rigid skeleton of cellulose acetate after spinning can improve the breaking strength and mechanical properties of polyacrylonitrile. The polymer grafted with cellulose acetate contains an expansion flame-retardant structure of piperazine phosphate, which can promote the formation of an expansion carbon layer in the fiber during combustion, improve the limiting oxygen index of the fiber fabric, and has good flame retardant properties.

The invention relates to a preparation technology of a polyurethane nanoscale microporous membrane for protective clothing, and belongs to the technical field of clothing fabric preparation, and the preparation technology specifically comprises the following steps: extracting silk fibroin and carrying out hydrophobic modification to obtain modified silk fibroin; then, the modified cellulose and polyurethane are mixed and dissolved in a solvent, a pore-forming agent and breathable particles obtained by mixing the modified cellulose and aerogel powder are added, and a mother solution is prepared; and finally, preparing a membrane by using the mother liquor, thereby obtaining the polyurethane nano-scale microporous membrane for the protective clothing. According to the process, modified silk fibroin and a polyurethane material are mixed, and breathable particles obtained by mixing modified cellulose and aerogel powder are added, so that the mechanical property of the membrane is remarkably improved, and the breathability is optimized. Meanwhile, through acetylation treatment on silk fibroin and modification on carboxymethyl cellulose by using dopamine hydrochloride, the overall performance of the material and the stability in the preparation process are further improved.

The invention relates to the technical field of fireproof and flame-retardant materials, and discloses a preparation method and application of a high-temperature-resistant and flame-retardant fireproof blanket, and the high-temperature-resistant and flame-retardant fireproof blanket is formed by weaving high-temperature-resistant and flame-retardant fireproof polyester fibers; the polyimide flame retardant and polyethylene glycol terephthalate are subjected to blending melt spinning, and the high-temperature-resistant flame-retardant fireproof polyester fiber is obtained. A molecular chain of the polyimide flame retardant contains an ester group structural unit, and the polyimide flame retardant has good compatibility with polyethylene glycol terephthalate, so that the polyimide flame retardant is uniformly dispersed in polyester fibers, the mechanical properties of the fibers are improved, and higher breaking strength and elongation at break are shown. Meanwhile, the limit oxygen index of the polyester fiber is increased, the initial thermal weight loss temperature and the high-temperature mass residual rate are obviously increased, and the polyester fiber shows good flame retardance and high-temperature resistance.

The invention relates to the technical field of fibers, and discloses an anti-ultraviolet moisture-absorbing fiber, a preparation method thereof and a fabric, and the anti-ultraviolet moisture-absorbing fiber is obtained by adding polyethylene glycol terephthalate and a polymer ultraviolet absorbent into a screw melt spinning machine for spinning and drawing by a drawing machine. The compatibility between the polymer ultraviolet absorbent and polyethylene glycol terephthalate is very good, adverse effects on the mechanical properties of polyester fibers are avoided after spinning, and a polymer molecular chain contains a 2-hydroxybenzophenone ultraviolet absorbing group, so that very good ultraviolet aging resistance is achieved, and the service life of the polyester fibers is prolonged. And the fiber after ultraviolet aging still has very high breaking strength and breaking elongation. The molecular side chain of the polymer ultraviolet absorbent contains a large number of carboxyl groups, so that the hydrophilicity and the moisture absorption rate of a fiber fabric can be improved by adding the polymer ultraviolet absorbent into polyester fibers, and the polymer ultraviolet absorbent shows higher moisture regain.

The invention discloses toughened aluminum oxide ceramic and a preparation method of the toughened aluminum oxide ceramic. The invention relates to the technical field of alumina ceramics, and relates to the technical field of alumina ceramics. The alumina ceramics comprise, by weight, 2-6 parts of clay, 20-30 parts of nano aluminum powder, 70-90 parts of alumina powder, 8-12 parts of concentrated sulfuric acid, 8-12 parts of microcrystalline cellulose, 3-4 parts of a sintering aid, 3-4 parts of quartz, 3-4 parts of calcite, 12-16 parts of graphene and 5-7 parts of a binder. A compression molding method is adopted, nanofibers are evenly added into a ceramic material, the nanofibers serve as a toughening phase of a matrix, the fracture toughness and the relative strength of the composite material are remarkably enhanced, and when fiber-reinforced ceramic is fractured, through pulling-out, bridging, debonding and fracture of the fibers, the strength of the composite material is greatly improved. And the surface energy increment during fracture is improved in manners of micronization, bending, deflection and the like of cracks, so that the toughness is improved.

The utility model discloses an anti-static and anti-fouling plastic packaging film which is wound on a wind-up roller and comprises a body, the body comprises a body upper layer, a tensile layer and a body lower layer, the body upper layer is adhered to the upper side of the tensile layer, the body lower layer is adhered to the lower side of the tensile layer, and the body upper layer is adhered to the lower side of the tensile layer. The tensile layer comprises two reinforcing ribs and an anti-cutting face, the anti-cutting face is arranged between the two reinforcing ribs, the probability that the body is punctured can be reduced through the anti-cutting face in the tensile layer, and the problem that one corner of a packaged object is exposed outside, so that the packaged object is collided and even soaked by rainwater, and the internal object is damaged is solved. By means of the structure, waste of the packaging film can be avoided, meanwhile, time wasted by re-wrapping can be avoided, meanwhile, the two reinforcing ribs can be used for reducing the possibility that when a small object is wrapped, the body is tightened forcibly so as to ensure that the body is fractured during tight wrapping, and meanwhile the reinforcing ribs can also be used for reducing the possibility that the body is transversely pulled to be broken.

The present application belongs to the technical field of high-performance nylon fiber materials, and particularly relates to a preparation method of antibacterial modified high-performance nylon fiber. The preparation method comprises the following steps: S1, a triazine ring-containing dicarboxylic acid is prepared by taking cyanuric chloride, 4-amino-2,2,6,6-tetramethylpiperidine and p-hydroxybenzoic acid as raw materials, triphenylphosphine oxide is subjected to nitration treatment and reduction treatment to obtain tris(3-aminophenyl)phosphine oxide, and the triazine ring-containing dicarboxylic acid and the tris(3-aminophenyl)phosphine oxide are mixed for a synthesis reaction to obtain modified hyperbranched polyamide; S2, polyamide masterbatch, modified hyperbranched polyamide, antibacterial material, zinc stearate and antioxidant are melt blended, extruded and granulated to obtain modified nylon chip; and S3, the modified nylon chip is subjected to melt spinning to obtain antibacterial modified high-performance nylon fiber. The present application not only ensures that the fiber has good antibacterial performance, but also effectively improves the breaking strength and flame retardant performance.

The present invention relates to the field of ceramic manufacturing technology, specifically to a high-hardness alumina-based ceramic and a preparation method thereof. The high-hardness alumina-based ceramic includes the following raw materials in parts by mass: 88 to 90 parts of alumina, 5 to 7 parts of zirconium oxide, 2 to 4 parts of lanthanum boride-modified barium titanate, 1 to 3 parts of zirconium oxide-modified silicon carbide, 6 to 8 parts of sintering aids, 1 to 2 parts of polyacrylic acid, 1 to 2 parts of sodium alginate, 0.5 to 1.0 parts of triammonium citrate, and 15 to 20 parts of solvent. The sintering aid includes a composition of magnesium oxide, nano-titanium dioxide, glass powder, and niobium pentoxide. In the scheme, alumina is used as the main body, zirconium oxide is added as a toughening agent, lanthanum boride-modified barium titanate and zirconium oxide-modified silicon carbide are used as toughening agents, and a sintering aid is introduced to improve the sintering performance, effectively improve the density of alumina-based ceramics, and increase mechanical properties such as hardness and fracture toughness.

The invention provides a preparation process of a warm-keeping, breathable, antibacterial, anti-mite and anti-static cashmere overcoat lining, and belongs to the technical field of lining fabrics. Based on the selection of the satin weave crepe plain satin fabric, strict control of the degumming rate, and the selection of the Newton blue acid dye for constant tension jig dyeing machine dyeing and the preshrinking process, the color fastness, breaking strength, luster and soft hand feeling of the fabric are synergistically improved, the possibility of pilling and the stitch slipping condition are reduced, and the produced overcoat lining fabric is soft in hand feeling, good in hand feeling and good in hand feeling. The fabric is soft in gloss, stable in size and suitable for frequent wearing, washing injury is avoided, and the problems of scratching and hooking injury and poor antistatic property in wearing are solved.

The invention provides a double-layer jacquard fabric interlayer weaving process and a double-vision artistic effect realization method, and the method comprises the following steps: providing warp yarns, weft yarns and interlayer connecting yarns which are adaptive to double-layer jacquard, and the breaking strength of the interlayer connecting yarns is not less than 3.2 cN / dtex; the method comprises the following steps: importing surface layer jacquard pattern data and inner layer jacquard pattern data into a pattern weaving CAD system, presetting a yarn interweaving threshold value and pattern edge transition parameters of an interlayer connection area, generating a collaborative weaving data table of surface and inner layer jacquard and interlayer connection, marking corresponding interweaving areas of surface layer patterns and inner layer patterns, and carrying out collaborative weaving; the collaborative weaving data table comprises intervention opportunities and interweaving frequency parameters of connecting yarns in each region; according to the invention, by switching the connecting structure in different periods, adapting to the characteristics of the jacquard area and combining the parameters of the connecting yarn and the limitation of the interweaving depth, the complete concealment of the connecting points, the accurate alignment of mirror image jacquard of the surface and inner layers, the control of the dislocation amount within 0.15 mm and the complete and non-split double-visual effect are realized, and the visual requirements of high-end fabrics are met.

The invention relates to the technical field of fabric recovery, in particular to a production process of cyclically regenerated polylactic acid and low-temperature spandex fabric. The production process provided by the invention overcomes the problems of high stress of polylactic acid and low-temperature spandex fabrics at low temperature and poor dyeing and fixation effects. Four different types of fabrics including polylactic acid fibers, cotton fibers, polyester fibers and spandex are subjected to recovery treatment and physical treatment and then treated with an organic solvent and a phosphoric acid solution, and the raw materials are treated with a prepared PLA decomposition catalyst and a lactide ring-opening catalyst. Vitamin B12, a chain extender and isocyanate are supplemented in the technological process, and the dyeing process of low-temperature treatment is adopted, so that the stress of the regenerated polylactic acid and low-temperature spandex fabric is reduced, the dyeing and color fixing effects are good, and the closed loop of recycling and reusing of the polylactic acid and spandex waste fabric is realized.

The invention relates to a high-resilience PA6 series polyamide thermoplastic elastomer as well as a preparation method and application thereof. The defects of low breaking strength, poor resilience and the like caused by insufficient intermolecular binding force of a traditional PA6 series elastomer are overcome. The elastomer disclosed by the invention is stable and controllable, high in breaking strength, excellent in rebound resilience and adjustable in shore hardness, and overcomes the defects in the prior art.

The invention provides a sweat-proof quick-dry textile containing a silver ion antibacterial agent and a preparation method of the sweat-proof quick-dry textile. The preparation method of the modified polyester fiber comprises the following steps: S1, blending modified titanium dioxide, modified nano-silver antibacterial powder and polyethylene glycol terephthalate I in a weight ratio of (2-3): (1-2): 15, and extruding by using a screw extruder to prepare modified master batch; s2, blending the modified master batch and the modified fiber forming resin according to the weight ratio of (2-5): 100, and spinning to obtain modified polyester fibers; and (2) blending the modified polyester fibers and cotton fibers in a weight ratio of 100: (35-45) to obtain blended yarns, and weaving by taking the blended yarns as warp yarns and weft yarns to obtain the sweat-proof quick-dry textile containing the silver ion antibacterial agent. The prepared textile is good in anti-ultraviolet, sweat-proof and quick-drying effects.

The invention discloses a nascent filament, a polyamide fiber and a preparation method and application of the nascent filament and the polyamide fiber. The nascent filament is prepared by the following steps: performing wet spinning on a spinning solution to form the nascent filament; wherein the viscosity of the spinning solution is not lower than 1Pa. S; wherein the spinning solution comprises polyamide and a solvent; the polyamide contains at least one diamine unit and at least one diacid unit, the diacid unit contains at least one aliphatic diacid unit and at least one aromatic diacid unit, and the diamine unit at least contains a pentamethylene diamine unit. The wet spinning technology can be suitable for high-melting-point polyamide resin and is beneficial to industrial large-scale production, the prepared nascent filaments are good in processability, and the polyamide fibers prepared from the nascent filaments have excellent heat resistance, high strength and low shrinkage performance and can adapt to various application scenes.

The application discloses a kind of low basis weight high-density fiber material preparation methods, the fiber material includes fiber layer and hot melt powder layer;The fiber layer is filled with superfine powder;Including the following steps: (1) polyvinyl alcohol ultra-short fiber, polyester superfine ultra-short fiber, fine denier ultra-short cellulose fiber are made into mixed slurry, then wet-laid web is made;(2) the wet-laid web is consolidated into intermediate material, then the intermediate material hot water bath is made, and polyvinyl alcohol ultra-short fiber is dissolved;(3) superfine powder is made into suspension, and filled into intermediate material;(4) hot melt powder is made into suspension slurry and coated and fixed.Reduce the unit area mass of material, increase the density of material under low basis weight, utilize the thermal closing pore effect of superfine powder, ensure the safety of battery separator product.Realize the technical requirement of low basis weight, high density and high porosity, solve the problem that existing fiber material cannot meet the use requirement of battery separator.

The invention relates to a high-strength antibacterial spandex fabric and a preparation method thereof, and belongs to the technical field of functional textile materials. The spandex fiber comprises a spandex fiber matrix and a functional polymer layer grafted on the surface of the matrix through a covalent bond, and the functional polymer layer is a polymer of an unsaturated derivative of natural phenolic acid and is prepared by introducing carbon-carbon unsaturated bond groups such as acryloyloxy and the like into the natural phenolic acid through esterification or etherification. During preparation, the spandex fiber is subjected to plasma pretreatment, and then the spandex fiber and the natural phenolic acid-containing unsaturated derivative monomer are subjected to thermal initiation or photo-initiation graft polymerization to form the functional layer. The lasting and stable antibacterial function is achieved through covalent bond grafting, the natural phenolic acid derivative endows the fiber with the environment-friendly and non-dissolution type antibacterial property, the functional layer can improve the modulus and breaking strength of the fiber, the intrinsic elasticity of spandex is considered, the comfortable fitting characteristic of the composite fabric is reserved, and the composite fabric is endowed with the high strength and the antibacterial function.

The invention discloses a method for synthesizing waterborne polyurethane resin by adopting a prepolymer dispersion method, and relates to the technical field of waterborne polyurethane processing, and the method comprises the following steps: (1) preparing raw materials; (2) prepolymerization; (3) refluxing; (4) neutralization reaction; (5) dispersing, emulsifying and carrying out chain extension reaction; and (6) packaging a finished product. The waterborne polyurethane resin is synthesized by introducing the modified cellulose nanofibers and the functionalized nanosilicon dioxide and combining a prepolymer dispersion method, and the finally synthesized waterborne polyurethane resin has excellent comprehensive performance, especially water resistance and mechanical performance; therefore, the prepared waterborne polyurethane resin can be better applied to the fields of new energy automobiles, intelligent manufacturing, environment-friendly building materials and the like, the use value of the product is greatly improved, and the service life of the product is prolonged.

The invention belongs to the technical field of functional modification of fiber materials, and discloses an ionic liquid impregnated modified antibacterial nylon fiber and a preparation method thereof. The preparation method comprises the following steps: mixing an ionic liquid solubilizer, an ionic liquid and water to obtain an ionic liquid antibacterial impregnation liquid; the nylon fibers are soaked in a surfactant solution for surface treatment; carrying out impregnation treatment on the pretreated nylon fiber by adopting the ionic liquid antibacterial impregnation liquid, and drying the impregnated nylon fiber to obtain the ionic liquid impregnated modified antibacterial nylon fiber. The prepared modified antibacterial nylon fiber has broad-spectrum antibacterial performance and a stable antibacterial effect, and particularly has a remarkable antibacterial effect on escherichia coli, the breaking strength and the elongation at break are remarkably improved, and the application range of the antibacterial nylon fiber is widened. Meanwhile, the preparation process of modification is simple, operation is easy and convenient, and industrial production is easy to achieve.

The invention relates to the technical field of regenerated fiber manufacturing, in particular to a method for preparing filament fibers from waste PET (polyethylene terephthalate) materials, which comprises the following steps: raw material pretreatment, ultrasonic-assisted depolymerization, continuous polymerization and functional modification, melt direct spinning, grinding of waste yarns in a chemical fiber factory, crushing of waste PET bottles, grinding after cleaning, and obtaining of PET powder; the method comprises the following steps: mixing PET powder with ethylene glycol according to a molar ratio, generating BHET under the action of ultrasonic waves, sequentially carrying out esterification, pre-polycondensation and final polycondensation on the BHET to obtain a regenerated PET melt, adding a modified additive in the esterification reaction, spinning the regenerated PET melt by adopting a one-step process, cooling by cooling air, and winding to obtain the filament fiber. The problems that traditional regenerated PET fibers are single in raw material, complex in process and insufficient in performance are solved, low-cost and high-efficiency preparation of semi-dull, flame-retardant, cationic dyeable and other multifunctional products is achieved, and high-value utilization of waste PET is improved.

The invention relates to a preparation method of polyester staple fibers. A composite functional additive is designed to be a mixture of silicon dioxide, germanium dioxide, aluminum oxide and surface-modified aluminum-doped zinc oxide powder, so that the polyester staple fibers can obtain good far-infrared emission function, thereby obtaining good thermal insulation performance, and the thermal insulation performance can be further improved by matching the design of the powder particle size. Dimethyl propanediol, 2,5-dimethyl-2,5-hexyne diol, 2-butene-1,4-di-n-butyl ester and di(hexane-1,6-diol) titanium are added, so that the prepared polyester staple fibers have good thermal insulation performance, breaking strength and moisture regain. Coconut charcoal can absorb and emit far-infrared rays with a wavelength of 4 to 14 μm, thereby stimulating the formation of negative ions that are beneficial to the body, and can generate a porous and water-permeable surface layer on the fiber surface, so that skin sweat can be dissolved, and dryness and comfort can be ensured while keeping warm, and bacterial growth can be avoided.