51results about How to "High moisture permeability" patented technology

The present invention relates to a multimicroporous foamed dressing with multilayer structure and its preparation method. The thickness of said dressing is 1-7 mm, and its structure contains the following three layers: first layer is outside protective film layer whose thickness is 10-90 micrometer, second layer is internal absorption foamed layer with several holes whose diameter is 80-400 micrometer and third layer is wound-contacting layer with several microfine pores whose average diameter is below 60 micrometer, and its thickness is 0.1-200 micrometer. Its preparation process is simple and includes the following steps: firstly, mixing 40-75 wt% of polyurethane prepolymer, 15-45 wt% of foaming agent, 5-35 wt% of cross-linking agent and 0.5-15wt% of additive containing surfactant, humectant, releasing agent, bactericide and pigment, stirring them, injecting them into mould, foaming and moulding.

The invention relates to an electrostatic spinning method and device of a fiber-based waterproof moisture-permeable film high in moisture-permeable flux. The electrostatic spinning method includes that during electrostatic spinning, polymer solution jet flow is injected at a certain included angle with air of a certain temperature and/or lateral air flow of non-solvent steam, and polymer molecules in the jet flow are quickened to be separated and solidified into fibers; water-pressure resistance of the electrostatic spinning film, namely the fiber-based waterproof moisture-permeable film high in moisture-permeable flux is greater than or equal to 100kPa, and the moisture-permeable flux is greater than or equal to 15000g/m<2>/d. The electrostatic spinning device is composed of an electrostatic spinning box, a high-voltage direct-current power supply, an electrostatic spinning hydraulic system, a spinning jet and a receiving base material, and a steam generation and air supply system is mounted on one side of the electrostatic spinning box. The fiber-based waterproof moisture-permeable film produced by the method has the advantages of small bore diameter, controllable adhesion degree and high porosity; the film is high in water-pressure resistance and moisture-permeable flux when used in the waterproof and moisture-permeable areas, and is wide in actual application prospect.

The present invention relates to an ultra-high-flux nano-fiber waterproof gas-permeable membrane and a preparation method thereof, and belongs to the field of textile technology material synthesis. The ultra-high-flux nano-fiber waterproof gas-permeable membrane is prepared from the following two components such as bifunctional group-modified nano-silica particles and a polymer nano-fiber membrane, wherein the nano-fiber membrane uses the bifunctional group-modified nano-silica particles as the adhesive between fibers, such that the rub resistance of the membrane material can be enhanced, the nano-fiber surface roughness can be increased, and the water resistance of the fiber membrane can be increased. According to the present invention, the prepared ultra-high-flux nano-fiber waterproof gas-permeable membrane has characteristics of small pore size, high porosity and enhanced adhesion structure, can provide advantages of high water resistance, high moisture permeable flux and high strength in the waterproof and moisture permeation field, has the moisture permeation flux of more than or equal to 18000 g/m<2>/d, has the water resistance of more than or equal to 100 kPa, and has wide practical application prospects.

The invention discloses special high-temperature resistant waterproof air and moisture permeable resin for coating printing and a preparation method thereof. The resin is prepared by the following steps of: obtaining a prepolymer through a reaction between polyether polyol and diisocyanate; and modifying the prepolymer by use of polyhedral oligomeric silsesquioxane to obtain the resin, wherein the average molecular weight of the resin is 50000-150000g/mol, the viscosity is 60000-100000cps/25 DEG C, and the solid content of the resin is 30-55%. In the polyurethane resin prepared by the method disclosed by the invention, the moisture permeability can reach 7500g/m<2>.24H, and the water pressure resistance is greater than 10000mmH2O; moreover, the polyurethane resin has the processing characteristic of tolerating a temperature of 200-230 DEG C for continuous 30S during coating printing; and the resin has highly-permeable coating and soft and smooth handfeel, and is washable and very suitable for the direct coating and coating printing technology of fabric coating processing.

The invention relates to a preparation method of flexible polyhydroxyl polyester fibers. The preparation method comprises the steps of mixing dihydric alcohol, polyhydroxyl and polyethylene glycol macromolecules according to certain molar ratio, esterfying in different stages, wherein slightly excessive acid is used in a first esterfying stage to ensure that parts of polyhydric alcohol, which has low ability to be involved esterification reaction, can be fully reacted and grafted into a polyester molecular chain; supplementing dihydric alcohol to regulate terminal carboxyl group of copolyester in a second esterfying stage, and then carrying out condensation polymerization to prepare flexible polyhydroxyl polyester; and performing melt spinning to the flexible polyhydroxyl polyester to prepare the flexible polyhydroxyl polyester fiber. The flexible polyhydroxyl polyester fiber has good moisture absorption performance and softening property, and the fiber can be dyed in a mild condition and has good dyeing performance due to the polyhydroxyl active sites in fiber and ether bonds in flexible chain polyethylene glycol; the flexible polyhydroxyl polyester fiber can be widely applied to preparation of antistatic moisture-absorption and sweat-releasing fibers and used as a closed-fit fabric. The modification effect is remarkable and the method is particularly suitable for melt direct-spinning process.

The invention relates to a terylene yarn with high moisture-transmitting property and a production method thereof. The terylene yarn is made by blended spinning of a straight-line section terylene fiber and a cruciform section terylene fiber. The production steps include (1) the straight-line section terylene fiber and the cruciform section terylene fiber are selected based on the ratio of fiber number; (2) the terylene yarn is produced after treatment of fiber strand and mixing. Number of inner capillary porosity and capillary wicking of the produced terylene are greatly increased and the moisture-transmitting property is obviously improved. The terylene yarn can be used for producing high moisture-transmitting fabric textile separately or together with other fiber yarn, thereby being widely applicable to fields of cloths, decoration and industry.

A multiple function bamboo-carbon terylene fiber/cross-section PTT fiber (60-40%) union is made by the process: (1) the density of the single fiber thread of the bamboo-carbon terylene fiber is 1-3D; (2) cospinning the bamboo-carbon terylene fiber with the 60-40% cross-section PTT fiber which the density of the single thread is 1-3D. it can solve the problem of the bad moisture absorption and feeling the glassy smooth of the fabric made from the bamboo-carbon terylene fiber, so it can be used for the sports wear and the summer wear.

The invention provides a total heat exchange membrane and a preparation method thereof, and also provides a total heat exchange core, a total heat exchanger and an air-handling unit. The total heat exchange membrane includes a heat conduction hydrophilic porous structure membrane and a hydrophilic polymer composite material coated on the heat conduction hydrophilic porous structure membrane, wherein the heat conduction hydrophilic porous structure membrane is mainly prepared from heat conduction hydrophilic composite fiber by nonwoven fabric process or lamination process, the heat conduction hydrophilic composite fiber includes hydrophilic fiber and high thermally conductive filler, and the hydrophilic polymer composite material comprises a hydrophilic high polymer material and filler. The total heat exchange membrane provided by the invention utilizes heat conduction hydrophilic fiber network as the substrate or skeleton of the total heat exchange membrane, and the substrate or skeleton is coated with the hydrophilic polymer composite material, thus improving the moisture permeability and heat conductivity of the total heat exchange membrane.

The invention belongs to the field of high polymer materials, and particularly relates to a super-hydrophobic water-proof moisture-permeable nanometer fiber material and a preparation method thereof.The super-hydrophobic water-proof moisture-permeable nanometer fiber material is prepared from super-hydrophobic electrospinning nanometer fibers of a three-dimensional through porous structure through mutually staggered arrangement, wherein the super-hydrophobic electrospinning nanometer fibers are a blend of polystyrene, polyurethane and a hydrophobe modified silicon dioxide. The preparation method comprises the steps that the polystyrene, the polyurethane and the hydrophobe modified silicon dioxide are uniformly dispersed into an organic solvent to form a spinning solution, and preparationis conducted through electrospinning. The fiber film is small in diameter, interfiber pores are small, the porosity is high, the moisture permeable flux is high, the water-proof performance is improved, the moisture permeable performance is improved, and the super-hydrophobic water-proof moisture-permeable nanometer fiber material has wide application prospects in the outdoor and protective fields.

The invention belongs to the field of functional knitted product production, and relates to a production technology of PTT (Polytrimethylene Terephthalate) fiber knitted seamless underwear with a high wicking function. The production technology comprises the steps that a PTT fiber with the crossed cross section and a bamboo carbon polyester fiber are taken as raw materials; two rough yarns and a double rough yarn feeding technology are adopted to manufacture a blended yarn; the blended yarn is knitted by a seamless knitting machine to form seamless knitted underwear grey cloth; and the seamless knitted underwear grey cloth is subjected to scouring and bleaching pretreatment, then dyeing treatment, and dehydration, drying, afterfinish and shaping treatment to from a PTT fiber seamless knitted underwear product with the high wicking function. The PTT fiber seamless knitted underwear with the high wicking function has the significant characteristics of moisture absorption, wicking, easiness in curing, bacteriostasis and the like; particularly, a wicking speed, the fastness to washing, the dimensional stability and the like of the product reach design requirements very well; and the design rationality of the product, the practicability of the product, the scientific rationality of the production technology and the significance of economic and social benefits are reflected.

The invention provides antibacterial non-dyeing ecological multielement color modulation series yarn and fabric. The antibacterial non-dyeing ecological multielement color modulation yarn is formed through blending of copper-modified polyester fibers, original ecological viscose fibers and other common fibers. The yarn count of the antibacterial non-dyeing ecological multielement color modulation yarn is 9.8-36tex; the antibacterial non-dyeing ecological multielement color modulation fabric is woven from the antibacterial non-dyeing ecological multielement color modulation yarn through warping, sizing, drafting and weaving. The raw materials for the yarn include the original ecological viscose fibers with a natural khaki primary color, the copper-modified polyester fibers with a green-red color and excellent antibacterial and bacteriostatic functions, and other common fibers, so that the biological chromatography requiring no dyeing treatment is realized and the excellent antibacterial and bacteriostatic effects are achieved. The fabric is woven from the yarn of the invention; the selected yarn has colors itself and has the excellent antibacterial effect, so that the fabric achieves the combined effects of bacterium resistance, environmental protection, practicability and aesthetic effect.

The invention discloses an aspergillus flavus infection resistance method for xanthan gum composite membrane covered peanuts, comprising the following steps of adding peanut shell powder into a citric acid solution, conducting microwave extraction, leaching and concentrating the solution; adding absolute ethyl alcohol into the solution; standing, centrifuging, precipitating, freezing and drying; smashing to obtain peanut water-soluble dietary fiber; adding the peanut water-soluble dietary fiber into distilled water, and mixing uniformly; adding the xanthan gum under a stirring condition; removing bubble in vacuum to obtain xanthan gum water-soluble dietary fiber composite membrane coating materials; coating the coating materials on peanuts; packaging the peanuts; and storing the peanut at a normal temperature. The xanthan gum composite membrane covered peanuts prepared by the method can resist the aspergillus flavus infection, restrains the growth of the aspergillus flavus, prevents the peanut fat from being oxidized and is stored for a long term and suitable for industrial production.

The invention discloses a compound spunlace non-woven fabric. The compound spunlace non-woven fabric has a three-layer compound structure; spunlace non-woven fabric layers are served as upper and lower layers; a reinforced layer is served as a middle layer; the upper spunlace non-woven fabric layer, the middle reinforced layer and the lower spunlace non-woven fabric layer are integrally fixed. Thecompound spunlace non-woven fabric disclosed by the invention has a reasonable structure; the three-layer compound structure is adopted; the spunlace non-woven fabric layers are served as upper and lower layers, the reinforced layer is served as the middle layer and the three layers are integrally fixed through spunlace, so that the problem of low strength of the traditional spunlace non-woven fabric is relieved and the tensile strength of the spunlace non-woven fabric is greatly promoted; uniform small holes are densely distributed in the reinforced layer, so that the moisture conductivity of the compound non-woven fabric is enhanced, the strength of the spunlace non-woven fabric is promoted and the additional value of the product is increased under the condition that the performances ofthe spunlace non-woven fabric are not changed.

The invention provides a waterproof moisture-permeable film and a preparation method and application thereof. The waterproof moisture-permeable film takes a fiber film as a base material, has the advantages of wide spinnable raw material range, small fiber membrane aperture, high porosity, strong structure adjustability and the like, and can obtain higher water pressure resistance and moisture-permeable flux compared with waterproof and moisture-permeable fabrics. A blocked solvent isocyanate cross-linking agent is utilized, after the cross-linking agent is deblocked, the cross-linking agent and active groups in a waterproof agent are subjected to a cross-linking reaction, hydrophobic chain segments are stably coated on the surface of the fiber, and the durability of a waterproof agent coating is improved. After 50 times of abrasion circulation, the contact angle is not obviously changed, the water pressure resistance and the moisture-permeable flux are basically kept unchanged after 30 times of washing, and the waterproof moisture-permeable film has a wide application prospect in the fields of outdoor jackets, field military garments and medical treatment and public health.

The invention relates to a method for wet-type burning sea sand to produce a high strength building material. The method comprises the following steps: weighing sea sand and slaked lime at a weight ratio of 60-90%: 10-40%, stirring and mixing uniformly, adding sea water, mixing, and performing compression moulding to obtain the building material proximate matter green body; demoulding the green body and performing wet type burning to obtain the building material proximate matter product. Through detection, the breaking strength is 20-24MPa, the adding amount of sea water is 5-20% of sea sand and slaked lime; sea sand is a dinas which is directly exploited on the sea land and corroded by the sea water without being desalted; the wet-type burning process comprises the steps of putting the green body in a hydrothermal reactor, and performing hydrothermal solidification for 9-24h at the temperature of 120-240 DEG C. The local material sea sand in the coastal city and the island with rich reserves and low utilization rate is solidified to form a wall brick, a floor tile, a square brick, an artificial fish reef and an ocean river reinforcing dam; the island building cost and time are greatly saved and the method is particularly suitable for the development and construction of a remote island (such as Nansha islands).

The invention discloses a skin-friendly low-permeability ES composite short fiber for a hot-air non-woven fabric surface layer. The ES composite short fiber has a skin-core structure and consists of acore layer and a skin layer, wherein the core layer comprises the following raw materials in parts by weight: 85-90 parts of polypropylene, 5-9 parts of ethylene propylene copolymer, 14-18 parts of acrylic acid-acrylamide super absorbent resin and 6-11 parts of inulin; and the skin layer comprises the following raw materials in parts by weight: 80-85 parts of polyethylene, 10-15 parts of methyl methacrylate grafted modified polyethylene, 8-12 parts of ethylene propylene copolymer, 4-7 parts of polyvinyl alcohol, 7-15 parts of superfine pearl powder and 12-17 parts of sodium polyacrylate superabsorbent resin. The skin-friendly low-permeability ES composite short fiber for the hot air non-woven fabric surface layer has the advantages of skin-friendly property, moisture absorption, breathability, elasticity, no irritation to skin, sanitation, antibiosis and the like; and the amount of reverse osmosis after water absorption is small, and the skin-friendly low-permeability ES composite short fiber belongs to the low reverse osmosis type.

The present invention relates to a method for preparing moisture-absorbent and quick-drying fabric. The method comprises: preparing fully-drawn yarn of textured yarn: in the process of preparing the round sheath-core composite fiber from high-viscosity PET and low-viscosity PET according to the FDD process, changing spinneret holes from circular to trilobal, performing cooling by using cross air blow, controlling the arrangement of the trilobal spinneret holes on a spinneret plate to meet certain conditions, and performing relaxation heat treatment to obtain the fully-drawn yarn of the textured yarn; and taking the cotton fiber and the fully-drawn yarn of the textured yarn as the raw materials for processing, wherein the processing process is: weaving on the machine, finalizing the designin advance, performing pre-treatment, performing dyeing, performing soft treatment, and performing scutching and setting. The prepared moisture-absorbent and quick-drying fabric has the moisture absorption that: a water absorption rate is greater than or equal to 250%, a drip diffusion time is less than or equal to 1.9 seconds, and a wicking height is greater than or equal to 142mm; and the quick-drying performance that: a evaporation rate is greater than or equal to 0.38g/h. According to the method provided by the present invention, the problem of increasing the moisture conductivity of thefiber without using functional finishing is solved, and the moisture absorption and quick-drying performance of the fabric can be improved as a whole.

The invention discloses a micro-structure condensation cloth for all-weather water collection, which is characterized in that the micro-structure condensation cloth overcomes gravity to realize continuous directional water transportation on the premise of not consuming extra energy by constructing a microscopic spine structure on the surface of a fiber prepared from a radiation refrigeration composite material, so that all-weather condensed water collection is realized. Compared with the prior art, the micro-structure condensation cloth not only has the functional characteristics of excellent directional water transportation capacity, radiation refrigeration performance and the like, but also has the excellent structural characteristics of softness, light weight, large surface area and the like, and a condensation device with a controllable shape and structure can be constructed; a user can design different structures according to actual requirements so as to adapt to complex application requirements of multiple scenes. The method can be applied to areas where available surface water resources are deficient due to drought, semi-drought, water pollution, water and soil loss and the like, the problem of water shortage can be relieved to a certain extent, and a candidate choice is provided for production and domestic water.