1138results about "Melt spinning methods" patented technology

The invention relates to the field of regenerated fiber production equipment manufacturing and process integration, and discloses a modular intelligent continuous regenerated fiber production line which comprises a sorting and cleaning module, a melt extrusion module, an impurity filtering module, a granulation module, a decoloration module, a solid phase polycondensation tackifying module and a melt spinning module. The self-adaptive material distribution device is used for realizing material connection among the modules; the automatic control system is used for realizing collaborative operation of all the modules; wherein the solid phase polycondensation tackifying module is provided with an intelligent control unit for dynamically optimizing the operation of the solid phase polycondensation tackifying module. Compared with the prior art that each process is relatively independent and depends on manual scheduling or simple linkage, the scheme effectively overcomes the common problems of unsmooth material conveying, unbalanced matching between modules and insufficient automation degree in the traditional regeneration process, and remarkably improves the production continuity and the resource utilization rate.

The invention relates to the technical field of antibacterial and antifouling fabrics, provides a preparation method of an antibacterial and antifouling fabric, and solves the problem of poor fabric durability caused by single functional component and lack of physical protection in the prior art. The preparation method comprises the following steps: S1, preparing MOFs loaded antibacterial fibers: blending a metal organic framework antibacterial composite nanomaterial and a polymer matrix material, and carrying out melt spinning to prepare the MOFs loaded antibacterial fibers; s2, constructing a self-cleaning functional coating: dispersing the fluorinated nanoparticles and a polymer adhesive in a solvent to prepare a self-cleaning coating solution; s2, performing surface activation treatment on the MOFs-loaded antibacterial fiber obtained in the step S1, soaking the MOFs-loaded antibacterial fiber in the self-cleaning coating liquid, and performing pulling and curing to form a bionic micro-nano structure coating on the surface of the MOFs-loaded antibacterial fiber so as to obtain a functional composite fiber; s3, spinning forming: taking the functional composite fibers obtained in the step S2 as warp yarns and / or weft yarns, and weaving to obtain the antibacterial and antifouling fabric.

The invention relates to the technical field of knitted fabrics, in particular to a high-strength wear-resistant anti-snagging functional dry knitted fabric for exercise training and a production process thereof, and the production process comprises the following steps: weighing the following raw materials in parts by weight: 30-40 parts of polyester fibers, 20-30 parts of aramid fibers, 5-10 parts of jade fibers and 5-10 parts of polyamide fibers; polyester fibers, aramid fibers, jade fibers and polyamide fibers are subjected to relaxation treatment and then subjected to a drawing procedure, and the mixed roving is obtained. According to the knitted fabric for exercise training, polyester fibers, aramid fibers, jade fibers and polyamide fibers are blended and blended to prepare mixed roving, meanwhile, the mixed roving is infiltrated and improved through infiltrating liquid, finally, the mixed roving is matched with modified polyester filaments to be subjected to circular knitting improvement, and the obtained knitted fabric has the advantages of being excellent in wear resistance, mechanical strength performance and snagging performance, good in elasticity and good in elasticity. And the knitted fabric has remarkable moisture absorption, dryness and dryness and washing resistance, and the comprehensive coordination of the product is excellent.

The invention discloses a light-weight moisture-conducting functional fabric and a preparation method thereof, and relates to the technical field of textile, the light-weight moisture-conducting functional fabric comprises an inner layer and an outer layer, the inner layer is obtained by blending polyester fibers and nylon special-shaped section fibers, and the outer layer is obtained by blending modified polypropylene fibers and hollow polyester fibers; the modified polypropylene fiber is obtained by mixing polypropylene slices and modified jade powder, melting, spinning and stretching; the prepared fabric has the light weight characteristic and the one-way moisture guiding capacity, sweat can be rapidly discharged out of the body, dry and comfortable isolation between the skin and the outside is achieved, and multiple health protection functions such as lasting antibiosis, efficient ultraviolet resistance and contact cool feeling are organically integrated.

The invention provides a multifunctional polyester yarn production system and an intelligent regulation and control method thereof, and relates to the field of chemical fiber spinning engineering. Comprising a multi-source sensing module, the multi-source sensing module carries out real-time acquisition processing on a multi-physics coupling process state set to form process state basic data, and the acquisition processing adopts a multi-type sensing device. And the depth inference processing module is used for carrying out space-time coupling inference processing on the process state basic data to form a process state recognition result. According to the multifunctional polyester yarn production system, through real-time acquisition and depth inference processing of multi-physical field data by the multi-source sensing module, accurate identification and prediction of a process state in a production process are realized. According to the multifunctional polyester yarn production system and the intelligent regulation and control method thereof, a space-time joint prediction model is used, the space-time joint prediction model comprises a graph convolutional network and a long-short-term memory network, space and time characteristics in data are fully mined, and the accuracy of process state recognition is improved.

The invention discloses an anti-ultraviolet high-flame-retardant polyester fiber and a preparation method thereof. The polyester fiber is prepared from the following raw materials in parts by weight: 100 parts of polyester chips, 20-60 parts of core-shell flame-retardant anti-ultraviolet particles and 2-4.5 parts of an anti-dripping agent. According to the invention, a porous alumina-titanium dioxide compound is used as a carrier, a magnesium hydroxide flame retardant, iron-doped carbon dots with photo-thermal performance and auxiliaries (an antioxidant and an ultraviolet light absorber) are combined with the carrier to construct a structural system loaded with multiple active components: functionalized flame-retardant particles, and then a polyurethane microporous membrane is coated, so that the flame-retardant polyurethane composite material is obtained. The core-shell type flame-retardant anti-ultraviolet particles are added into polyester fibers, so that the anti-ultraviolet performance and the flame-retardant performance of the polyester fibers can be remarkably improved. The polyester fiber provided by the invention can adaptively increase the release rate of the ultraviolet absorbent and the antioxidant when the ultraviolet property is enhanced in the environment, so that more optimized protection can be provided for a polyester fiber matrix at the moment.

The invention relates to the technical field of layered composite fabrics, in particular to a flame-retardant-fiber-based multilayer flame-retardant composite fabric for an aircraft cabin and a preparation method of the flame-retardant-fiber-based multilayer flame-retardant composite fabric. The preparation method comprises the following steps: reacting acrylic acid with DOPO to prepare modified DOPO; reacting the epoxy POSS with the modified DOPO to prepare a composite flame retardant; reacting the hydrophilic grafted polyamide with a composite flame retardant and amino-modified nano-montmorillonite to prepare modified polyamide; carrying out melt spinning and chopping on the modified polyamide to obtain flame-retardant fibers; the flame-retardant fibers are spun into flame-retardant yarns, then the flame-retardant yarns are spun into a fabric, and a surface fabric is obtained; the flame-retardant fibers and the polyester fibers are blended to obtain blended yarns, and then the blended yarns are spun into a fabric to obtain a bottom layer fabric; and compounding the surface layer fabric and the bottom layer fabric to obtain the composite fabric. The prepared composite fabric has excellent flame retardant property and antistatic property, and can be applied to aviation cabins.

The invention discloses a moisture-absorbing and sweat-guiding polyester fabric and a preparation method thereof, and relates to the technical field of high-performance fiber fabrics. The invention discloses a moisture-absorbing and sweat-guiding polyester fabric which comprises moisture-absorbing and sweat-guiding polyester fibers. The moisture-absorbing and sweat-guiding polyester fiber contains 5-12wt% of cool-feeling particles; the preparation method comprises the following steps: firstly, depositing mesoporous silica on the surface of a base material by using a pretreated mica sheet to obtain modified particles; coating the modified particles with a binary phase change material to obtain core-shell particles; and finally, carrying out hydrophilic treatment on the surfaces of the core-shell particles to obtain the cool-feeling particles. The cool particles are added into polyester, so that the polyester material is endowed with instantaneous cool performance, and the polyester is endowed with moisture absorption and sweat guide performance. The polyester fabric prepared by weaving the moisture-absorbing and sweat-guiding polyester fibers has good wearability.

A preparation method of the outdoor high-strength polyester fiber with the radiation refrigeration function comprises the following steps that titanium dioxide, silicon dioxide, silicon carbide and zirconium phosphate are blended and ground in proportion and then dispersed in an acetone solution, a dispersing agent is added, and nano-particle dispersion liquid is formed through ultrasonic treatment; mixing the nano-particle dispersion liquid with the polyester chips; feeding the mixed composite material into a screw extruder for melt blending to form a spinning solution; after being accurately metered by a metering pump, the spinning solution is extruded by a spinneret plate to form fiber tows, and the spinneret plate is provided with a slow cooling and heating device; and performing post-treatment on the fiber tows to obtain the high-strength polyester fibers. According to the invention, a specific combination of titanium dioxide, silicon dioxide, silicon carbide and zirconium phosphate is selected, and a specific slow cooling technology and high-power stretching shaping are matched, so that the fiber has excellent radiation refrigeration performance and mechanical strength, and can be widely applied to the fields of outdoor clothing, awning cloth, car clothing and the like.

The application discloses a light-weight moisture-conducting functional fabric and a preparation method thereof, and relates to the technical field of textiles.The light-weight moisture-conducting functional fabric comprises an inner layer and an outer layer, the inner layer is obtained by blending polyester fibers and nylon special-shaped cross-section fibers, and the outer layer is obtained by blending modified polypropylene fibers and hollow polyester fibers; the modified polypropylene fibers are obtained by melting and spinning the mixture of polypropylene chips and modified jade powder and then stretching; the prepared fabric not only has the characteristics of light weight and one-way moisture-conducting capability, can quickly discharge sweat outside the body, realizes dry and cool isolation between the skin and the outside world, and has multiple health protection functions such as persistent antibacterial property, efficient ultraviolet resistance and contact cool feeling.

The invention belongs to the technical field of polyester fibers, and particularly provides a flame-retardant polyester fiber and a preparation method thereof.The polyester fiber is prepared from, by weight, 50-70 parts of polyester chips, 6-10 parts of flame-retardant polyester master batch and 1-2 parts of antioxidant; wherein the flame-retardant polyester master batch is obtained by extruding and granulating a montmorillonite-based flame retardant and polyester powder. According to the invention, the montmorillonite-based flame retardant is introduced into the polyester fiber, so that the polyester fiber has excellent flame retardance and anti-dripping effect.

The invention discloses a water-repellent warm-keeping chinlon 6 hollow fiber and a preparation method thereof, and belongs to the technical field of functional fiber materials. The preparation method comprises the following steps: preparing a water-repellent master batch from a fluorine-containing acrylic copolymer, polysiloxane, hydrophobic nano silicon dioxide, a chinlon 6 slice and an antioxidant, melting the water-repellent master batch and the chinlon 6 slice by adopting a melt spinning method, and spinning through an annular spinneret plate hole formed by two C-shaped grooves, so as to prepare the water-repellent warm-keeping chinlon 6 hollow fiber. The fiber has water repellency and heat preservation performance, is soft in texture, capable of absorbing sweat, quick to dry, light in weight, capable of keeping warm, good in water repellency effect and long in waterproof time, and has wide application prospects in the aspect of preparation of outdoor sportswear and high-cold waterproof clothes.

The invention discloses a jacquard vamp material based on bio-based degradable polylactic acid (PLA) and a preparation method thereof, and relates to the technical field of shoe materials. The jacquard vamp material is of a three-layer jacquard structure formed by integrally weaving PLA composite filaments through a jacquard warp knitting machine. The PLA composite filament is prepared from the following raw materials in parts by weight: 80-95 parts of polylactic acid (PLA) slices, 5-15 parts of poly (butylene adipate / terephthalate) (PBAT), 3-8 parts of a flexibilizer, 1-3 parts of a compatilizer, 0.5-2 parts of an anti-hydrolysis agent and 0.5-1.5 parts of a lubricant. According to the invention, the bio-based PLA is used as a main raw material and is matched with degradable auxiliaries such as PBAT, so that the whole vamp material can be completely biodegraded under a composting condition, the problem of environmental pollution of a traditional vamp is fundamentally solved, and meanwhile, through blending modification of PBAT and the flexibilizer, the flexibility and impact resistance of the PLA material are remarkably improved, and the vamp material has good application prospects. The requirements of the vamp material on softness, wear resistance and durability can be met.

The invention discloses a lignin-derived carbon fiber-based sodium metal battery negative electrode material which is prepared by the following steps: performing granulation and melt-blowing on lignin to obtain lignin fibers, performing pre-oxidation and carbonization treatment on the lignin fibers to obtain lignin-derived carbon fibers, soaking the lignin-derived carbon fibers in a silver nitrate saturated solution, taking out the lignin-derived carbon fibers, and drying to obtain the lignin-derived carbon fiber-based sodium metal battery negative electrode material. And carrying out flash burning treatment to obtain the silver nanoparticle / lignin derived carbon fiber composite material. The invention discloses a composite electrode plate for a sodium metal battery, which is prepared by the following steps: grinding a lignin-derived carbon fiber-based sodium metal battery negative electrode material into a short fiber shape, uniformly mixing with polyvinylidene fluoride and N-methyl pyrrolidone to prepare slurry, coating a negative current collector with the slurry, and cutting into pieces to obtain the lignin-derived carbon fiber-based composite electrode plate. The lignin-derived carbon fiber-based sodium metal battery negative electrode material has a three-dimensional interpenetrating network structure, has a high specific surface area, enables an electric field to be uniformly distributed, inhibits dendritic crystal growth, and is suitable for a sodium metal battery system.

The invention relates to the technical field of composite fibers, in particular to a light-absorbing and heat-generating composite fiber and a preparation method thereof.The preparation process comprises the following steps that 1, core-shell structure light-absorbing and heat-generating particles are prepared; (2) carrying out surface modification on ferroferric oxide coated silicon dioxide particles; (3) in-situ polymerization; and (4) melt spinning. According to the scheme, nano ferroferric oxide is selected as a core light absorption material, and due to a unique Fe < 2 + > / Fe < 3 + > mixed valence electronic structure, while wide-spectrum light absorption is realized, oxidative photo-generated holes are hardly generated, so that the photocatalytic degradation risk similar to titanium dioxide is avoided from the source, and the long-term stability of a polymer matrix is guaranteed; in combination with in-situ polymerization, axial gradient magnetic field spinning processes and the like, the washing resistance, aging resistance and strength of the light-absorbing and heating composite fiber are synchronously improved.

The invention relates to the technical field of fabrics, in particular to a cool-feeling long cilia strip and a preparation method thereof.The cool-feeling long cilia strip is composed of cool-feeling fibers and a long cilia strip base material and is characterized in that the cool-feeling fibers comprise a core layer, a functional skin layer and an outer thin skin layer; the functional skin layer is prepared from the following components: a sulfonated copolyester matrix, catechol grafted master batch, surface modified zeolite nano powder, an anti-hydrolysis agent and an antioxidant, and the functional skin layer also contains introduced Zn < 2 + > and Mg < 2 + >. Zn < 2 + > and Mg < 2 + > which are stably combined on anchoring points of sulfonated copolyester are subjected to hydration endothermic reaction when being in contact with water, so that a cool feeling is generated; the surface modified zeolite nano powder synergistically enhances moisture absorption and water temporary storage by virtue of the specific surface area, and continuously provides water for an ionized hydration reaction to prolong and amplify a cool feeling effect; the catechol grafting structure endows the fiber with antibacterial performance, and long-term stability of the structure is ensured through an interface enhancement effect. And the outer layer hydrophilic polyester is matched, so that the product has comfort, durability and functionality.

The invention relates to the field of textiles, and particularly discloses a preparation process of antibacterial fibers, which comprises the following steps: S1, respectively drying and preparing polymer slices and an antibacterial agent; s2, performing melt spinning on the polymer slices and an antibacterial agent, performing air cooling, and then performing traction and winding to obtain antibacterial fibers; wherein the antibacterial agent is prepared by mixing dodecyl trimethyl ammonium chloride, polyvinylpyrrolidone and core-shell type antibacterial particles according to the mass ratio of (0.4-0.5): (0.1-0.2): 1, the core-shell type antibacterial particles are prepared by loading nano-zinc oxide and nano-silver particles on intercalation modified montmorillonite and then forming a silicon dioxide coating layer through a sol-gel method, and the core-shell type antibacterial particles are prepared from the silicon dioxide coating layer through a sol-gel method. And carrying out spray drying to obtain the core-shell antibacterial particles. The preparation method has the characteristic of improving the antibacterial durability and uniformity of the antibacterial fiber.

The invention discloses a high-color-fastness washable polyethylene fabric and a preparation process thereof in the field of functional polymer materials. The high-color-fastness washable polyethylene fabric is prepared from the following raw materials: polyethylene resin, maleic anhydride-acrylic acid copolymer grafted polyethylene, dopamine-silane composite modified polyethylene, magnesium stearate and an antioxidant. Wherein the maleic anhydride-acrylic acid copolymer grafted polyethylene is prepared by copolymerizing maleic anhydride and acrylic acid and then blending and granulating with polyethylene, and carboxyl and acrylate groups are introduced to enhance the binding force with dye; the dopamine-silane composite modified polyethylene is prepared through polyethylene surface hydroxylation, dopamine self-polymerization modification and silane grafting reaction, and the acting force and hydrophobicity between fibers are doubly improved through a catechol group and an epoxy group. According to the prepared fabric, the color fastness and the washing resistance are remarkably improved, meanwhile, the original characteristics of light weight and chemical corrosion resistance of polyethylene are kept, and the application scene is expanded.

The invention relates to the technical field of control systems, in particular to a high-strength polyethylene fiber melt flow control system and method. Comprising a melt conveying unit, a pressure adjusting unit, a temperature control unit, a flow monitoring unit and a central control unit, the melt conveying unit is used for conveying high-strength polyethylene fiber melt; the pressure adjusting unit is arranged in a pipeline of the melt conveying unit and used for adjusting melt conveying pressure. The temperature control unit is used for controlling the temperature in the melt conveying process; the flow monitoring unit is arranged at the tail end of the melt conveying unit and used for monitoring the melt flow in real time; the central control unit is electrically connected with the pressure adjusting unit, the temperature control unit and the flow monitoring unit, receives monitoring data of the flow monitoring unit and conducts coordinated regulation and control on the pressure and temperature of the melt through the pressure adjusting unit and the temperature control unit according to preset flow parameters. The flow of the high-strength polyethylene fiber melt is accurately controlled.

The invention relates to the technical field of polyester fibers, in particular to a preparation method of antibacterial modified polyester fibers, the prepared antibacterial modified polyester fibers have excellent antibacterial performance, a multi-layer antibacterial system is formed by introducing a nano-zinc oxide and Schiff base compound antibacterial agent into the polyester fibers, and the antibacterial performance of the polyester fibers is improved. Nano zinc oxide and copper / zinc oxide particles have broad-spectrum antibacterial property and can destroy cell walls and cell membranes of bacteria so as to achieve the antibacterial effect, and Schiff base as an organic antibacterial agent can be combined with receptors on the cell membranes of the bacteria to enhance the antibacterial effect; chitosan and cinnamyl aldehyde are adopted as raw materials for preparation of the Schiff base, and the two substances have good biocompatibility and degradability, so that the Schiff base compound antibacterial agent is safer and more environmentally friendly in the fiber; the nano zinc oxide, the copper / zinc oxide particles, the chitosan, the cinnamyl aldehyde and the like in the raw materials are all environment-friendly materials and are good in degradability, and environmental pollution and ecological damage can be reduced.

To provide a method of manufacturing fibers having improved comfort and water and odor adsorption properties.SOLUTION: There is provided a method for making fibers, the method including: doping a liquid polymer with zeolite particles encapsulated in a sealing material, wherein the zeolite particles have an average diameter of 0.2 to 50 micron (inclusive) and are present in fibers at a concentration of 250 to 25,000 parts per million; forming fibers from the particle-doped polymer; and treating the fiber with 5 to 25% NaOH, LiOH, or KOH at about 80°C to 100°C for about 15 to 45 minutes to remove a portion of a surface layer of the fiber to form weight-reduced fibers, wherein the portion of the surface layer of the fiber that is removed has a thickness of about 0.1 to 10 times the average diameter of the zeolite particles, and wherein the fiber forms a multifilament yarn or a staple fiber with an odor adsorption or an odor activity value (OAV) of at least 15.SELECTED DRAWING: None

To provide a spinneret for a multi-rotor coaxial spunbond and / or melt-blown plant.SOLUTION: A spinneret 1 includes: a plurality of acceleration ducts 2, each of which extends along its own supply axis 2a crossing the main plane 1b and each of which is adapted to supply a respective polymer filament along the supply axis; a plate 7 having first holes 70 accommodating the acceleration ducts, and second holes 71 that are spaced apart from the first holes and allow passage of air or gas; and a mask 8 that is adjacent to the plate along a vertical axis 1a, is centered on the first holes, is fluidly connected to the second holes, and accommodates a part of the acceleration ducts while having a plurality of third holes 80 through which air or gas passes, wherein the second holes are in a number greater than 4, are distributed around at least a part of the first holes, and have their centers located along a circumference 7a that develops around the first holes in parallel with the main plane without touching other first holes.SELECTED DRAWING: Figure 1a

The invention relates to the technical field of polyamide fiber manufacturing, and provides a porous polyamide fiber preparation method which comprises the following steps: respectively feeding skin layer polyamide, a cross-linking agent and core layer polyamide into a mouth mold; the pore-foaming agent is decomposed to generate gas, and the gas forms a uniform closed-pore structure in situ on the core layer chinlon; in the fusion cavity, the cross-linking agent is sandwiched between the core layer chinlon and the skin layer chinlon to generate a chinlon material with a skin-core chinlon cross-linked structure; after being pulled out through a spinning nozzle, the chinlon material is bundled through an oiling roller, and after oiling, chinlon fiber tows are formed; the polyamide fiber tows are subjected to graded stretching and winding forming, and finished polyamide fiber products are obtained. Therefore, a uniform closed pore structure is formed in the core layer chinlon through the gas decomposed by the pore-forming agent; a skin-core chinlon cross-linked structure with chemical bonding and low-heat-conduction network functions is formed between the core layer and the skin layer through a cross-linking agent. The thermal conductivity and the weight of the polyamide fiber are remarkably reduced, meanwhile, the polyamide fiber has high strength, and the light and warm-keeping polyamide fiber is obtained.

The invention relates to the technical field of fibers, and discloses an easily biodegradable polyester-nylon composite fiber and a preparation process thereof.The preparation method comprises the steps that 2-(2-acrylamido ethyl formate) benzoic acid is subjected to graft modification to obtain modified polylactic acid, and the modified polylactic acid, polyethylene glycol terephthalate PET and nylon 66 resin are subjected to blending melt spinning to obtain the polyester-nylon composite fiber. The modified polylactic acid improves the compatibility between the PET and the nylon 66 resin, so that the polyester-nylon composite fiber has higher mechanical properties, and the tensile strength and the elongation at break are obviously improved. The polylactic acid has better biodegradability, and the introduced ester group also has biodegradability, so that the biological decomposition rate of the fiber is improved. The modified polylactic acid contains a large amount of hydrophilic carboxyl and amido bonds, so that the moisture regain of the composite fiber is improved, and the modified polylactic acid can be better applied to hydrophilic moisture absorption fiber textiles.

This invention provides a novel thermal insulation fabric and its preparation method. The preparation method uses polyester material as the polymer matrix, Cs x Wo3NPs, as a photothermal conversion material, is melt-blended and extruded to obtain a composite masterbatch, which is then melt-spun into composite polyester fibers. These fibers are subsequently knitted with a certain proportion of spandex filaments to create a novel thermal insulation fabric. This fabric not only possesses excellent light absorption and heat generation properties, but also addresses the technical issues of easy coating peeling and short service life in finished textiles by encapsulating inorganic nanoparticles with organic polymers. This ensures the stability and safety of the photothermal conversion nanoparticle material. Furthermore, the fabric has a silky smooth feel, good elasticity, and excellent dyeing properties.

The invention provides a bio-based super-soft cool antibacterial knitted fabric and a preparation method thereof. The preparation method comprises the following steps: step 1, blending modified nanometer jade powder and PLA master batch, and carrying out melt spinning through a double-screw extruder to obtain cool fibers; 2, polyamide is mixed with the mango seed kernel extract and the polythiophene nano shell powder, and hollow fibers are obtained through wet spinning; 3, combing and drawing PLA fibers, the hollow fibers and the cool fibers to obtain blended yarns; 4, the PLA fibers and the blended yarn serve as outer layer yarn, the hollow fibers serve as inner layer yarn, a double-face circular weft knitting machine is adopted for knitting, and gray fabric is obtained; and step 5, carrying out low-temperature dyeing and post-treatment on the gray fabric to obtain the bio-based super-soft cool antibacterial knitted fabric. By optimizing the addition amount of the nanometer jade powder, the proportion of a marriage house and a low-temperature post-treatment process, collaborative improvement of cool feeling, antibiosis, breathability and super softness is achieved.

The method for producing recycled polyethylene terephthalate yarn according to the present invention includes the steps of melting recycled polyethylene terephthalate chips and spinning them through a spinning nozzle to produce a spun yarn, and multi-stage drawing and winding the spun yarn using equipment with five or more stages of drawing godet rollers, wherein the recycled polyethylene terephthalate chips contain 1.0 mol% or less of isophthalic acid, the draw ratio is 1.5 to 2.45, and the speed of the fourth godet roller among the five or more stages of drawing godet rollers is 5500 m / min to 7000 m / min. The recycled polyethylene terephthalate yarn produced by this method has a strength of 8.5 g / d or more and a dimensional stability ES of 11.0% or less.

The invention discloses a preparation method of a warm-keeping and health-care composite fabric, and relates to the technical field of functional fabrics. The preparation method comprises the following steps: firstly, combining fumed silica with graphene oxide hydrogel to prepare mixed aerogel; the mixed aerogel is combined with allyl trichlorosilane, and is grafted to a macromolecular chain of polypropylene through maleic anhydride, so that the compatibility is improved, and the agglomeration problem is solved; secondly, calcining tourmaline, then directly carrying out quenching hydration modification, combining Si-OH groups on the surface with active groups in a polyester molecular chain, and spinning into hollow fibers; the mixed aerogel can absorb far infrared rays dissipated and emitted by the modified tourmaline, and the aerogel absorbing the far infrared rays can generate a resonance effect and a warm effect and permeate into the deep layer of the skin; the modified tourmaline has the capability of generating negative ions, and the gull rock powder is added for combined action, so that the antibacterial effect is achieved by destroying the structure of bacteria, and the health-care effect is achieved. The composite fabric prepared by the invention has warm-keeping and health-care effects.

The invention discloses an anti-ultraviolet high-flame-retardant polyester fiber and a preparation method thereof. The polyester fiber is prepared from the following raw materials in parts by weight: 100 parts of polyester chips, 20-60 parts of core-shell flame-retardant anti-ultraviolet particles and 2-4.5 parts of an anti-dripping agent. According to the invention, a porous alumina-titanium dioxide compound is used as a carrier, a magnesium hydroxide flame retardant, iron-doped carbon dots with photo-thermal performance and auxiliaries (an antioxidant and an ultraviolet light absorber) are combined with the carrier to construct a structural system loaded with multiple active components: functionalized flame-retardant particles, and then a polyurethane microporous membrane is coated, so that the flame-retardant polyurethane composite material is obtained. The core-shell type flame-retardant anti-ultraviolet particles are added into polyester fibers, so that the anti-ultraviolet performance and the flame-retardant performance of the polyester fibers can be remarkably improved. The polyester fiber provided by the invention can adaptively increase the release rate of the ultraviolet absorbent and the antioxidant when the ultraviolet property is enhanced in the environment, so that more optimized protection can be provided for a polyester fiber matrix at the moment.

A polyethylene copolymer may comprise about 90 wt % to about 99.99 wt % ethylene and about 0.01 wt % to about 10 wt % an alpha-olefin that is not ethylene, wherein the polyethylene has: a density of about 0.930 g / cm3 to about 0.955 g / cm3, a melt flow index (2.16 kg at 190°° C.) of about 10 g / 10 min to about 50 g / 10 min, a melt flow index ratio (MIR) of about 15 to about 25, a weight average molecular weight to number average molecular weight ratio (Mw / Mn) of about 2 to about 4, a wt % of TREF elution at 90° C. and less of about 10 wt % to about 80 wt %, and a wt % of TREF elution at 95° C. and greater of about 3 wt % or more. Said polyethylene may be especially well-suited for making bicomponent fibers, which may be useful producing in nonwoven fabrics.