362 results about "Breaking strength" patented technology

The invention discloses a blue-and-white glaze and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials (ceramics), the blue-and-white glaze comprises quartz, feldspar, limestone, plant ash and other basic raw materials, zinc oxide, aluminum oxide, lanthanum oxide, cerium oxide and other rare earth elements, and a modified organic additive is introduced. Compared with the prior art, the blue-and-white glaze shows excellent stability in the drying and firing process, the phenomena of cracking and glaze stripping are effectively reduced, the friction coefficient after firing is low, the breaking strength and the breaking modulus are high, the glossiness and transparency of a glaze surface are remarkably improved, and the blue-and-white glaze has important application value.

The invention relates to the technical field of ceramic production, and discloses a high-temperature hard glaze formula for bone china and a bone china production process. 4%-6% of aluminum oxide; 2%-5% of boron oxide; 3%-7% of zinc oxide; 3%-10% of an alkaline earth metal oxide; 7%-13% of alkali metal oxide; 0.5%-2% of zirconium oxide; and 0.5%-1.5% of titanium dioxide. According to the high-temperature hard glaze formula for the bone china and the bone china production process, a proper amount of boric oxide, zinc oxide and lithium oxide are added into the glaze, so that the thermal expansion coefficient of the glaze is effectively reduced, and the thermal stability of the bone china is improved; by adding aluminum oxide, the breaking strength of the bone china can be greatly improved; by adopting a lead-free formula, lead pollution is avoided, and the environment-friendly requirement is met; through the optimized glaze formula and process, the bone china surface has good glossiness and smoothness.

The invention discloses a detection device and method for detecting the breaking strength of each strut of a powder metallurgy part with multiple struts, and relates to the technical field of detection of the breaking strength of struts of parts. The arched frame is fixedly arranged on the surface of a workbench, the tool assembly is arranged on the bottom surface of a cross beam of the arched frame and used for installing powder metallurgy parts with multiple supporting rods, two pressure sensor installation assemblies are arranged on the surface of the workbench, and the two pressure sensor installation assemblies are located on the left side and the right side of the tool assembly respectively; the workbench is further provided with a driving and impacting assembly which is located between the two pressure sensor installation assemblies and used for driving the pressure sensors to horizontally move in the horizontal direction and the vertical direction and impacting the supporting columns. The device has the beneficial effects that the detection time of the four supporting rods of a single part is greatly shortened, and the detection efficiency of the breaking strength of the four supporting rods of the part is greatly improved.

The invention discloses an ultra-high performance concrete material for a bridge structure as well as a preparation method and application thereof, and particularly relates to the field of concrete. The ultrahigh-performance concrete material for the bridge structure is prepared from the following raw materials in parts by weight: 230 to 240 parts of cement, 140 to 150 parts of fly ash, 50 to 60 parts of silica fume, 250 to 260 parts of fine aggregate, 50 to 60 parts of coarse aggregate, 5 to 9 parts of water reducing agent, 80 to 90 parts of steel fiber, 0.03 to 0.08 part of modified graphene, 3 to 5 parts of expanding agent, 1 to 3 parts of viscosity modifier and 70 to 80 parts of water. According to the prepared ultrahigh-performance concrete material for the bridge structure, the viscosity of the ultrahigh-performance concrete is improved, the compressive strength, the breaking strength, the tensile strength and other properties of the ultrahigh-performance concrete are improved, and the application prospect of the ultrahigh-performance concrete material in the concrete for the bridge is expanded.

The invention discloses a coal gangue-based reinforced cement composite material and a preparation method thereof, and relates to the technical field of building materials. The coal gangue-based reinforced cement composite material is prepared from a coal gangue-based reinforced admixture, calcium ion doped modified multi-walled carbon nanotubes, polypropylene fibers, P.O42.5 Portland cement, metakaolin, silica fume, a polycarboxylate superplasticizer and water, calcium ion doped modified multi-walled carbon nanotubes and a coal gangue based reinforced admixture are cooperatively added into a cement matrix, seamless filling from nanometer to micrometer is achieved, a tough interface transition area is formed, pressure is jointly borne by a compact matrix and a strong interface, the compressive strength and breaking strength of the material are remarkably enhanced, and meanwhile, the compressive strength and breaking strength of the material are greatly improved. Migration of moisture and ions is effectively blocked, and the anti-permeability performance of the material is improved.

The invention relates to the field of refractory castable, in particular to mullite-based modified high-strength refractory castable and a preparation process thereof. The refractory castable is used for solving the problems of low strength and poor wear resistance of the existing refractory castable. The niobium-zirconium alloy and the benzoxazine-PAMAM copolymer are added into the refractory castable, the benzoxazine-PAMAM copolymer wraps a matrix in a three-dimensional network structure, so that the cohesive force is improved, a carbon layer is formed among matrix particles after sintering to improve the overall compactness of the material, micropores in the matrix of the refractory castable can be filled with the niobium-zirconium alloy, the porosity is reduced, and the porosity of the refractory castable is improved. The refractory castable disclosed by the invention can be used for reducing stress concentration, remarkably improving normal-temperature compression resistance and breaking strength, maintaining long-term high-temperature strength and ensuring that the refractory castable can still be kept stable in severe environments such as high temperature, high pressure and corrosion, so that the service life is prolonged, and the production safety is improved.

The invention discloses multi-scale hybrid fiber high-toughness concrete and a preparation method thereof. The multi-scale hybrid fiber high-toughness concrete is prepared from 155 to 165 parts by mass of water, 400 to 450 parts by mass of cement, 30 to 70 parts by mass of fly ash, 1000 to 1100 parts by mass of broken stone, 700 to 750 parts by mass of river sand, 0.65 to 0.75 part by mass of a water reducing agent, 390 to 500 parts by mass of steel fibers, 40 to 50 parts by mass of polypropylene crude fibers and 2 to 6 parts by mass of polypropylene fine fibers. The particle size of the broken stones is 5-10 mm; the steel fiber is an end hook steel fiber, and the diameter of the end hook steel fiber is 0.75 mm; the diameter of the polypropylene crude fiber is 0.75 mm; and the diameter of the polypropylene fine fiber is 0.2 mm. According to the invention, the problem that the existing hybrid fiber concrete is relatively low in breaking strength and toughness indexes is solved.

The invention relates to high-strength and heat-resistant glass and a preparation method thereof, and belongs to the technical field of glass manufacturing, and the high-strength and heat-resistant glass comprises the following chemical components: SiO2, B2O3, Na2O, K2O, Al2O3, MgO, CaO, ZnO, Li2O, P2O5, Nb2O5, Re2O7, Gd2O3 and SrO. The average linear thermal expansion coefficient of the high-strength and heat-resistant glass prepared by the invention is (2.94 to 3.23) * 10 <-7 > / DEG C, the softening temperature is 710.1 to 720.4 DEG C, the breaking strength is 206.4 to 214.5 MPa, the impact strength is 49 to 54 cm, and the microhardness is 570 to 608 MPa.

The invention belongs to the technical field of light-weight high-strength aramid fibers, and particularly relates to a light-weight high-strength aramid fiber composite cord fabric and a production method thereof.According to the light-weight high-strength aramid fiber composite cord fabric and the production method thereof, by designing a yarn guide component with the proper roughness range and the twisting speed, friction of the yarn guide component to fibers is reduced, and strength loss is reduced; a certain twisting direction, twisting degree ratio and twisting tension of the A yarn and the B yarn are designed, so that the A yarn and the B yarn contribute the maximum strength at the same time. Therefore, on the premise that the specification of the cord fabric is not changed, the breaking strength of the aramid fiber composite cord fabric is improved.

The invention discloses a high-performance cement-based micro-expansion filling grouting material and a preparation method thereof, and belongs to the technical field of inorganic cementing materials. The high-performance cement-based micro-expansion filling grouting material is prepared from Portland cement, fly ash, graded aggregate, aluminum silicate coated aluminum powder, calcium silicate coated magnesium oxide, tung oil coated iron powder, a calcium formate early strength agent, polycarboxylate superplasticizer powder and water. According to the obtained high-performance cement-based micro-expansion filling grouting material, the fluidity ranges from 432 mm to 441 mm, the 28-day compressive strength ranges from 63.5 MPa to 65.2 MPa, the 28-day breaking strength ranges from 14.3 MPa to 15.1 MPa, the 28-day shrinkage rate ranges from 0.01% to 0.04%, and the 10-time freezing and thawing expansion rate ranges from 0.03% to 0.06%.

The invention discloses a design method of a high-ductility cement-based composite material, which comprises the following steps: S1, carrying out mix proportion design by using Box-Behnken in a response surface method, and designing a three-factor three-response test, the three factors being a water-binder ratio, a sand-binder ratio and a fiber mixing amount; s2, mixing and proportioning the materials according to the three factors in S1, and preparing to obtain the high-ductility cement-based composite material, s3, maintaining the high-ductility cement-based composite material obtained in the S2, and testing the three-response mechanical properties in the S1, wherein the three responses are compressive strength Y1, breaking strength Y2 and equivalent bending toughness Y3; and S4, analyzing the influence of the interaction of the three factors in the S1 on the three responses in the S3, establishing a response surface model equation through variance analysis verification, and verifying and optimizing a result to obtain an optimal mix proportion. A Box-Behnke method in RSM is adopted to establish a regression model with the water-binder ratio, the sand-binder ratio and the fiber mixing amount as influence factors and the compressive strength, the breaking strength and the equivalent bending toughness as response values.

The invention belongs to the technical field of precast concrete component crack repairing and solid waste, and particularly relates to a precast concrete component low-carbon repairing material and a preparation method and a use method thereof. The low-carbon repairing material has good compressive strength, breaking strength and bonding strength, the 28-day dry shrinkage rate is low, and the initial setting time and the final setting time of the low-carbon repairing material are short. By adopting the low-carbon repairing material, not only can the compressive strength and breaking strength of the repaired concrete prefabricated component be improved, but also the repairing time of concrete cracks can be shortened, and the repairing efficiency of concrete can be improved.

The invention discloses a method for determining interlayer tensile strength of a ceramic matrix composite based on a three-point bending test. The method comprises the following steps: acquiring the geometric dimension of an original sample and determining the carbon fiber trend of the original sample; treating and bonding the bonding surface of the original sample to obtain a to-be-tested sample; the geometric dimension of the three-point bending clamp is obtained, and the placement mode of the to-be-tested sample is determined; a standard three-point bending test is carried out, and the maximum loading force in the test process is obtained; and calculating the breaking strength of the to-be-tested sample by using a three-point bending stress formula. A to-be-tested sample is prepared by bonding a plurality of original samples, a standard three-point bending test is carried out by using the to-be-tested sample, and finally, the interlayer tensile strength of the original samples is calculated by using a three-point bending beam stress expression, so that the problems that a test sample is difficult to prepare and a test result is inaccurate in an existing standard test method are solved; the efficiency and the precision of measuring the interlayer tensile strength of the ceramic matrix composite material are improved.

The invention relates to the technical field of fabrics and discloses a wear-resistant and anti-pilling composite fabric and a preparation method thereof. According to the invention, a betaine polyaramid finishing agent and an emulsifier are added to water, stirred, and then a cotton fabric composite fabric is added for finishing, followed by two dipping and two padding, pre-baking, and baking to obtain the wear-resistant and anti-pilling composite fabric. The side chain of the betaine polyaramid contains active hydroxyl groups, which interact with the hydroxyl groups on the surface of the cotton fabric by hydrogen bonding and the like, thereby improving the bonding force between the two and making the polyaramid finishing agent more firmly adhere to the fabric surface and not easy to fall off after washing. The breaking strength, anti-pilling performance and wear resistance of the finished cotton fabric are significantly improved, and the fabric still has good breaking strength and wear resistance after multiple washings, thereby reducing fabric damage caused by wear and tear, enhancing the anti-pilling effect, ensuring the flatness and beauty of the fabric, and significantly extending the overall service life of products made of the fabric.

The invention relates to the technical field of ceramic production, in particular to a method for reinforcing, toughening and whitening a bottom of a ceramic tile. Comprising the following steps: S1, performing compression molding on ceramic powder to obtain a ceramic tile blank; s2, slurry spraying is carried out on the blank bottoms of the ceramic green bricks, and ceramic blank bottom whitening slurry is adopted for slurry spraying; the ceramic body bottom whitening slurry is prepared by mixing and ball-milling whitening slurry and water; by the adoption of the method, the whiteness of the ceramic bottom face can be effectively improved, and then the attractiveness of the product is improved; in addition, slurry is sprayed on the bottom surface of the ceramic tile blank, a compact wrapping layer is formed at the joint of the slurry and the tile blank in the firing process, namely, a high-compact interlayer is formed on the bottom surface and the front surface of the tile blank to wrap the tile blank, so that the mechanical properties such as breaking strength and toughness of the whole tile blank are improved, and the defects such as corner breakage of the bottom surface of the ceramic tile are reduced; the invention further provides a blank bottom slurry spraying system so as to improve the slurry spraying efficiency of the bottom face of the ceramic blank.

The invention provides a breaking strength detection device for plastic silk cloth roll production, and belongs to the technical field of breaking strength detection. Comprising a machine base and a tensile machine, a lifting base is assembled on the tensile machine, an upper fixing base is arranged at the bottom end of the lifting base, a cutting base corresponding to the tensile machine in position is fixedly connected to the machine base, and a turnover plate capable of moving in a turnover mode is arranged at the top of the cutting base. A lower fixing seat is arranged at one end, close to the tensile machine, of the cutting seat; and the cutting assembly is used for cutting the to-be-detected plastic silk cloth roll to form a sample for breaking strength detection. According to the breaking strength detection device for the plastic filament cloth roll production, by arranging the cutting base, the overturning plate and the cutting assembly, before the breaking strength detection device for the plastic filament cloth roll production is used for detecting, a plastic filament cloth roll to be detected can be quickly made into samples with consistent specifications, so that errors generated in the detection process are reduced, and the accuracy of a detection result is ensured.

A preparation method of an SOFC or SOEC with a long-life sealing interface is formed by allowing a sealing layer, a cell and a metal interconnector to be mutually contacted. In the present disclosure, with spinel as a coating material of the metal interconnector, staged thermal treatment is employed to form a high-density and strong-adhesion spinel coating to improve the endurance and entire performance of the metal interconnector. The present disclosure also optimizes the material system of the sealing layer, namely, uses the SiO2—MgO—Al2O3—SrO—V2O5 system to prepare the sealing layer, which not only improves the resistivity of the sealing layer but also increases its hardness and fracture strength. Further, under the condition of ensuring the airtightness, the coefficient of thermal expansion of the sealing layer is matched with the coefficients of thermal expansion of the metal interconnector and the cell, improving the endurance of the sealing interface.

The invention relates to the technical field of cement, and particularly discloses Portland cement and a preparation method thereof.The preparation method comprises the following steps that S1, 70-85 parts by mass of limestone, 10-20 parts by mass of clay, 3-5 parts by mass of iron ore, 3-6 parts by mass of silica fume, 0.8-2 parts by mass of calcium fluoride and 2-4 parts by mass of activated aluminum oxide are smashed and mixed to be uniform, 8-12 parts by mass of pulverized coal and 0.15-0.85 part by mass of a combustion improver are added, and a mixture is obtained; uniformly mixing to obtain a mixed raw material; s2, the mixed raw material is preheated and then calcined, the calcination temperature ranges from 1200 DEG C to 1400 DEG C, the calcination pressure ranges from 800 Pa to 1200 Pa, the calcination time ranges from 30 min to 60 min, cooling is conducted, and the Portland cement is obtained. According to the invention, by optimizing the raw material ratio and calcining in sections, the stability, compressive strength and breaking strength of the cement are effectively improved.

The invention discloses a preparation process of composite cement based on activation of steel slag micro powder, belongs to the technical field of cement preparation, and aims to solve the technical problem that durability and stability of cement are difficult to further improve in the prior art. A composite cement preparation process based on steel slag micro powder activation comprises the following steps: adding final powder, a polycarboxylate superplasticizer, a retarder and a defoaming agent into a stirring kettle, and uniformly stirring to obtain composite cement; according to the invention, through synergistic combination of the composite activator, the activated steel slag micro powder and the porous silicon-aluminum-calcium sustained-release microspheres, a multi-layer reaction system with early-stage excitation, middle-stage reinforcement and long-term reinforcement effects is constructed; all the components are complementary in time and space to form a compact and continuous skeleton structure, the aperture is refined, the interface is stabilized, and the internal humidity and ion supply are maintained, so that the compressive strength and breaking strength of the concrete are remarkably improved, the shrinkage rate is reduced, and the impermeability and freeze-thaw resistance are improved.

The present application relates to the manufacture of high-strength steel coated plate welded parts, in particular to a welding material, a high-strength steel workpiece, a laser welded joint and a manufacturing method thereof. The composition of the welding material satisfies the following conditions in terms of percentage by weight: C is greater than or equal to 0.5%, trace alloying elements are 0-0.36%, the content of Mn and Si is less than or equal to 2%, 6% is greater than or equal to 5C+Mn and is greater than or equal to 2.5%, and the rest is Fe and inevitable other elements; the trace alloying elements are at least one of Nb, V and Ti elements, and the content of Nb, V and Ti elements is less than or equal to 0.12%. The method does not need to remove the aluminum coating, utilizes the solid solution strengthening effect of C, and makes the volume fraction of lath martensite in the final weld after quenching greater than or equal to 90%. This scheme reduces the addition of alloying elements, reduces the cost and process control difficulty, avoids the formation of coarse carbides, improves the mechanical properties and stability of the joint, has high fracture strength and elongation, and realizes the double improvement of the strength and toughness and economy of the joint.

The invention discloses an additive manufacturing high-performance ultra-fine grain hard alloy. The high-performance ultra-fine grain hard alloy is prepared through hard alloy component control and a material extrusion-degreasing sintering process. By utilizing the synergistic effect of the rare earth oxide and the GGI, the dosage of the rare earth oxide and the GGI is reduced, the quality of a green body and a hard alloy sintered part is improved, and meanwhile, abnormal growth of WC grains is inhibited; and a nano second phase is generated in situ, so that the hardness, the transverse breaking strength and the breaking toughness of the hard alloy are synchronously improved, and the problem that the hardness and the breaking toughness of the hard alloy are mutually restricted is solved. According to the WC-Co ultra-fine grain hard alloy and the preparation method thereof, the grain size of the prepared WC-Co ultra-fine grain hard alloy is smaller than 330 nm, the hardness is larger than 2250 HV30, the transverse breaking strength is larger than 3900 MPa, the fracture toughness is larger than 14.2 MPa.m < 1 / 2 >, and the hardness, the transverse breaking strength and the fracture toughness are synergistically improved. The common hard alloy powder raw material is used, the cost is low, and the method is simple and suitable for batch production.

Provided is a foam sheet which has a tensile strength of 1-9 MPa, a breaking strength of 3.5 MPa or less when an interlayer strength measurement is performed, does not break when the interlayer strength measurement is performed, and has a thickness of 0.05-0.9 mm as a whole.

The invention relates to a panel material of a thermal insulation board, which is formed by curing panel slurry. The panel slurry is prepared from 26%-34% of cement, 38%-50% of quartz sand, 3%-10% of secondary coal ash, 2%-4% of silica fume, 0.6%-3% of a water reducing agent, 0.1%-1% of a defoaming agent, 0.1%-2% of an alkaline exciting agent, 0.1%-0.8% of graphene oxide grafted carbon fibers, 0.05%-1.5% of carboxymethylcellulose, 0.05%-1% of sodium gluconate, 0.8%-2.5% of an anti-corrosion inhibitor, 0.5%-2% of low-temperature water-based emulsion and 10%-16% of water. The sum of the percentages of the components is 100%. The panel prepared by the invention has the advantages of high compressive strength, breaking strength and corrosion resistance under the condition of smaller thickness (0.3-2cm), difficulty in cracking during drilling and the like, the service life of the thermal insulation board is prolonged, and the safety of the thermal insulation board is improved.

The present disclosure provides a member for a display device comprising a stacked body formed by stacking an impact absorbing layer and a hard coating layer, wherein, when measuring a tensile stress of the stacked body, a stress at which the hard coating layer breaks is regarded as a hard coating layer breaking strength, and an elongation at which the hard coating layer breaks is regarded as a hard coating layer breaking elongation, the hard coating layer breaking strength is 7 MPa or more, and the hard coating layer breaking elongation is 4% or more and 36% or less.

The invention discloses a light moisture-proof high-strength aerogel composite gypsum material and a preparation method thereof, belongs to the technical field of composite gypsum preparation, and aims to solve the technical problem that the moisture-proof performance and the strength of a composite gypsum material in the prior art need to be further improved. According to the invention, hydrophobic aerogel particles, a composite binder and surface treatment reinforced fibers are introduced into a gypsum matrix and form a stable multiple synergistic effect in a system; the aerogel particles provide heat insulation and hydrophobic channels, the composite binder enhances bonding among crystals through a chemical network, and the reinforced fibers realize high-efficiency stress transfer and keep interface stability at high temperature, so that the prepared composite material has relatively high compression resistance and breaking strength, the softening coefficient is greatly improved, the heat conductivity coefficient is obviously reduced, and the composite material has good heat insulation and heat preservation effects. The combustion performance is obviously improved, and the mechanical property, the water resistance, the heat insulation property and the flame retardant property are comprehensively and uniformly improved.

The invention relates to manufacturing of high-strength steel coated and plated plate welding parts, in particular to a welding flux, a high-strength steel workpiece, a laser welding joint and a manufacturing method of the laser welding joint. The solder comprises the following components in percentage by weight: more than or equal to 0.5% of C, 0-0.36% of trace alloy elements, less than or equal to 2% of Mn, less than or equal to 2% of Si, more than or equal to 6% of 5C + Mn and more than or equal to 2.5% of Fe and other inevitable elements, the trace alloy element is at least one of Nb, V and Ti elements, and the content of the Nb, V and Ti elements is not more than 0.12%. According to the method, an aluminum coating does not need to be removed, and the volume fraction of lath martensite in the quenched final weld joint is larger than or equal to 90% by means of the solid solution strengthening effect of C. According to the scheme, alloy element addition is reduced, cost and process control difficulty are lowered, thick carbide is prevented from being formed, the mechanical property and stability of a joint are improved, and the high breaking strength and ductility are achieved; the obdurability and the economical efficiency of the joint are improved.

The invention belongs to the technical field of green building materials, and provides fly ash-based geopolymer concrete and a preparation method thereof. The method provided by the invention comprises the following steps: mixing fly ash, natural sand, a composite activator and water, and sequentially carrying out vibration molding and sealed maintenance on the mixture to obtain the fly ash-based geopolymer concrete. The mixing proportion and the curing process are optimized through orthogonal design, and the compressive strength and the breaking strength of the geopolymer concrete are remarkably improved; the composite activator (6mol / L NaOH solution + 0.4 mol / L Na2SiO3 solution) can effectively promote the depolymerization of aluminosilicate to form compact N-A-S-H gel, so that the strength and durability of the concrete are enhanced; the process is simple, the cost is low, the fly ash can be treated on a large scale, the use amount of cement is reduced, carbon emission is further reduced, and the method conforms to the development trend of green building materials.

The invention discloses an evaporator and power conversion equipment, and belongs to the technical field of radiators. The multiple supporting structures are connected between the first inner wall face and the second inner wall face, part of the supporting structures define a pressure relief area, the pressure relief area communicates with the evaporation cavity, and the strength of the pressure relief area is smaller than that of the area where the other supporting structures are located; the pressure relief part is arranged in the pressure relief area and is arranged close to one supporting structure which forms the pressure relief area in a surrounding mode. The geometric shape of the pressure relief area is suddenly changed at the pressure relief part through the pressure relief part, so that the edge of the part, located in the pressure relief area, of the pressure relief part generates stress concentration under the action of pressure, the yield limit or the breaking strength of a material is easily reached firstly, breakage occurs, and directional pressure relief is achieved. Due to the fact that the wall thicknesses of the shell in the corresponding pressure relief area and the non-pressure relief area are the same, the overall corrosion resistance and strength of the evaporator are improved, and the reliability of equipment is improved.

The invention belongs to the field of fiber materials, and provides a hollow acrylic fabric with thermal insulation performance and a preparation process thereof. The composite design of an acrylonitrile-based copolymer shell layer and an inner cavity silicon dioxide aerogel layer is adopted, a boric acid ester cross-linked network is formed through borax bath treatment to lock a three-dimensional crimp structure, and a hydrophobic modified silicon dioxide aerogel layer with the thickness of 50-200 nm is constructed in a fiber inner cavity; the mechanical-structural synergy that the single-fiber breaking strength is not lower than 3.5 cN / dtex under the condition that the hollowness degree is 30%-45% and the fiber dry-state crimp number is not smaller than 12 / 25 mm is achieved, the thermal resistance of the fabric reaches 0.065 m.K / W to 0.075 m.K / W, the air permeability is kept at 150 mm / s to 250 mm / s, and the fabric has the advantages of being good in air permeability, good in air permeability and the like. The contradiction between mechanical bearing and hollow structure design under the high-solid-content wet spinning fine denier condition, the contradiction between structural stability and fatigue durability of boric acid ester cross-linked three-dimensional curl after multiple times of water washing and the contradiction between low gram weight and high thermal resistance and the heat transfer mechanism of breathable comfort are solved, and the wide warm-keeping garment application value is achieved.

The application relates to the technical field of high polymer materials, and discloses a high-hygroscopic polyester composite material and a preparation method thereof. The polyester composite material prepared by the application is prepared by taking PTT polyester and hygroscopic modified polyester as main raw materials and adding a toughening agent, an antioxidant, an ultraviolet absorber and a lubricant, and the fiber yarn prepared by using the polyester composite material has high hygroscopicity while keeping the breaking strength and elongation at break. Therefore, the fabric prepared by taking the composite material as raw material has excellent moisture regain and hygroscopicity.