327results about How to "Small fineness" patented technology

A leather-like sheet composed of a microfine-fiber entangled body made of bundles of microfine fibers and an elastic polymer impregnated therein. The bundles of microfine fibers are composed of microfine monofibers having an average cross-sectional area of 0.1 to 30 μm² and have an average cross-sectional area of 40 to 400 μm². The bundles of microfine fibers exist in a density of 600 to 4000/mm² on a cross section taken along the thickness direction of the microfine-fiber entangled body. The elastic polymer contains 30 to 100% by mass of a polymer of ethylenically unsaturated monomer. The polymer of ethylenically unsaturated monomer is composed of a soft component having a glass transition temperature (Tg) of less than −5° C., a crosslinkable component, and optionally a hard component having a glass transition temperature (Tg) of higher than 50° C. and another component. The polymer of ethylenically unsaturated monomer is bonded to the microfine fibers in the bundles of microfine fibers. The leather-like sheet has a flexibility and hand such as dense feeling each resembling natural leathers and a high quality appearance. The leather-like sheet is highly stable in quality such as fastness and surface abrasion resistance and excellent in practical performance.

A woven or knit fabric comprising air-jet interlacing spun yarns comprising polyester fibers of low titanium oxide content; a woven or knit fabric comprising air-jet interlacing spun yarns comprising polyester staple fibers obtained by graft polymerization of a hydrophilic compound; a woven or knit fabric comprising air-jet interlacing spun yarns comprising side by side crimped staple fibers; a woven or knit fabric comprising air-jet interlacing spun yarns comprising low-shrinkage staple fibers and copolymerized polyester staple fibers; and a process for producing these. A woven or knit fabric of polyester staple fibers that is bulky, excelling in moisture retention, lightweightness, water absorptivity, quick dryability, etc. and exhibits excellent anti-pilling properties can be obtained.

The invention discloses humidity and ultraviolet dual-cured polyurethane woodware coating and a preparation method thereof. A synthesis method includes synthesizing initial polyurethane polymer I, polyurethane pre-polymer II, polyurethane pre-polymer III, polyurethane acrylate oligomer and ultraviolet cured woodware coating. The humidity and ultraviolet dual-cured polyurethane woodware coating is mainly prepared by aliphatic diisocyanate, dihydric alcohol pre-polymer, polyhydroxy acid, epoxy resin and hydroxy acrylic ester and the like, and by adding auxiliaries such as photoinitiators, flatting agents, defoamers, substrate wetting agents and catalysts, the ultraviolet cured woodware coating is prepared. The ultraviolet cured woodware coating can form films and be cured under irradiation of ultraviolet, also can be cured by humidity in the air within 5 hours at the room temperature, and has the advantages of high solid, NCO (isocyanate) group content and adhesion force, fine resistance to chemical corrosion, high film coating hardness and fine storage stability and the like, can be used for irregular coating surfaces, hone finished UV (ultraviolet) paint and UV colored paint and the like where cannot be irradiated by the ultraviolet.

The invention discloses a method for producing regenerated polyester ultrafine fiber based on bicomponent fiber production equipment. The method comprises the following steps: a regenerated polyester slice and a water soluble polyester slice are used as raw materials; after the two raw materials are subjected to crystallizing and drying, extruding and fusing respectively, the two raw materials are fed to a composite spinning manifold, are extruded through an insulated spinning metering pump with accurate measurement, and are distributed to each composite spinning component; the two components are compounded to be shaped according to shapes set by a spinneret component, are extruded to be shaped through side ram cooling and oiled by a nozzle tip, and are wound by a winding head to form a regenerated polyester ultrafine POY spinning cake; and then the spinning cake is processed to obtain an applicable ultrafine fiber through subsequent texturing. After the method is adopted, through adjusting the processing technology, the regenerated polyester raw material can be applied to high grade fiber so as to improve effective application of resource, and save cost. The method has double significances of economy and environmental protection.

Provided are an amorphous polyetherimide fiber having not only a small single fiber fineness suitable for producing fabrics, and a fabric comprising the amorphous polyetherimide fiber. The fiber comprises an amorphous polyetherimide polymer having a molecular weight distribution (Mw/Mn) of less than 2.5, and having a shrinkage percentage under dry heat at 200° C. of 5% or less, and a single fiber fineness of 3.0 dtex or less. The fiber may have a tenacity at room temperature of 2.0 cN/dtex or greater.

A coated base fabric for airbags, which is fabricated by applying a resin elastomer to a base fabric formed of flattened cross-section yarns having a degree of filament cross-section flatness (that is, a ratio of the major axis length to the minor axis length of the filament cross-section) of from 1.5 to 8, and which is characterized in that the filaments are aligned in the base fabric in such a manner that the total average horizontal index (HI) represented by the following formula falls within a range of from 0.75 to 1.0, and the amount of the resin elastomer adhered to the fabric is from 0.1 to 60 g/m²: HI=(Σhi)/f wherein hi=cos θ, θ indicates the angle between the major axis direction of each filament and the horizontal direction of the fabric, f indicates the number of the filaments.

The invention relates to a crushing-ore milling-magnetic separation technique for magnetic iron ore. The technique comprises the step that raw ore is crushed into 0 mm-50mm through coarse crushing and middle crushing, and the technique is characterized by further comprising the following steps that middle crushed products are directly fed into a closed loop system formed by a high-pressure roller mill and a constant thickness screen; high-pressure roller mill products are fed into a pre-selection wet-type magnetic separator to be subjected to pre-selection wet-type magnetic separation, and concentrate and tailings are selected correspondingly; the pre-selection wet-type magnetic separation concentrate is fed into a vertical mill machine for milling, vertical mill machine products are fed into a primary classification whirlcone for classification, primary classification is conducted, the products with the diameters being below 0.074 mm are fed into a two-stage washing magnetic separator for separating operation, and the products with the diameters being above 0.074 mm are returned to the vertical mill machine; and concentrate of two-stage washing magnetic separator separating operation is final concentrate with the grade being 67.00%, and the pre-selection wet-type magnetic separation tailings and two-stage washing magnetic separator tailings are combined into final tailings. The crushing-ore milling-magnetic separation technique for the magnetic iron ore has the advantages that the technological process is shortened, energy consumption is reduced, and cost is reduced.

The invention discloses floating-bead-free low-density oil well cement paste and belongs to the technical field of oil and gas well cementation. The cement paste is prepared from 10-30% of cementing material A, 15-50% of cementing material B, 2-48% of filling material, 1-3% of fluid loss agent, 1-4% of early strength agent and 0.5-1.5% of dispersing agent. The cementing material A is one of G-grade oil well cement, D-grade oil well cement and ordinary Portland cement. The cementing material B is superfine ordinary Portland cement. The cement paste has the advantages of being low in cost, low in density, and high in early strength, density stability and quality stability.

The invention discloses a method for preparing ultrafine green tea powder and belongs to the technical field of deep machining of tea leaves. The method comprises the following steps: screening middle-grade and low-grade summer and autumn fresh green tea leaves in accordance with national pollution-free production standard; spreading the tea leaves, performing fixation on the tea leaves by combining steam heat and frying technology, drying the tea leaves by novel microwave grading technology, and performing low-temperature ultrafine pulverization to prepare the ultrafine green tea powder with D50 more than or equal to 2,500. The method for preparing the ultrafine green tea powder is characterized by simple process, reasonable steps, low cost, and suitability for industrialized production. The ultrafine tea powder produced by the method has complete breaking of cell wall, and high uniformity and dispersibility. During processing, nutrient components and pharmacologic components of green tea are retained to the maximum; a chemical additive can be widely replaced; the shelf life of food is prolonged; food is endowed with natural emerald green color and specific tea flavor; dietary fiber, active polysaccharide and other substances of the green tea are fully utilized; tea drinking is changed into tea eating; and products can be widely used in the fields of food, cosmetics, commodity and the like.

The invention discloses a super absorbent dust-free wiping cloth and a manufacturing method thereof. The wiping cloth is formed by interweaving warps and wefts and is characterized in that the dust-free wiping cloth is formed by circularly arranging square concave weave repeat units formed by interweaving the warps and the wefts along the warp direction and the weft direction respectively; at least one of the warp and the weft is formed by superfine fiber filaments; and in one weave repeat unit, the warps and the wefts are respectively arranged stepwise and upward in sequence from the central lowest point, and the floating length of the adjacent warps and the adjacent wefts on the steps increases in sequence to form concavo-convex patterns which are piled up alternately from low to high and have four high sides and low middle. The manufacturing method comprises the steps of beaming, drafting and reeding, weaving, weight reducing, tenter setting, laser cutting and packaging, thereby obtaining the super absorbent dust-free wiping cloth. The super absorbent dust-free wiping cloth has soft handfeel, good wiping effect and super absorbency and can be used in a dust-free room with a higher cleanliness requirement. The manufacturing method is simple and can be used for manufacturing the high-quality dust-free wiping cloth.

A liquid crystalline polyester fiber which exhibits a half width of endothermic peak (Tm1) of 15° C. or above as observed in differential calorimetry under heating from 50° C. at a temperature elevation rate of 20° C./min and a strength of 12.0 cN/dtex or more; and a process for production of the same. A liquid crystalline polyester fiber which is excellent in abrasion resistance and lengthwise uniformity and is improved in weavability and quality of fabric and which is characterized by a small single-fiber fineness can be efficiently produced without impairing the characteristics inherent in fabric made of liquid crystalline polyester fiber produced by solid phase polymerization, namely, high strength, high elastic modulus and excellent thermal resistance.

The invention belongs to the technical field of filling adhesives and especially relates to a high-thermal-conductivity single-component underfill adhesive prepared from the following components, by mass: 10 to 30 parts of polyurethane modified epoxy resin, 5 to 15 parts of a first filler, 5 to 10 parts of a second filler, 5 to 15 parts of a curing agent, 2 to 5 parts of a curing accelerator, 1 to5 parts of reactive diluent and 0.5 to 2 parts of a coupling agent. The first filler is spherical aluminum oxide, carbon nanotubes and silicon carbide, and the polyurethane-modified epoxy resin is prepared from a polyurethane prepolymer and epoxy resin through a reaction. The added spherical aluminum oxide, carbon nano tube and silicon carbide belong to fillers with high heat conductivity coefficient, insulation, low fineness and small specific gravity, generate a synergistic effect, and can meet the characteristics of high heat conductivity, quick flowability, high permeability and low viscosity of the underfill adhesive. And the heat generated by a chip is quickly transferred to the printed circuit board, so that the temperature of the chip is effectively reduced, and the heat dissipation efficiency of the chip is improved.

The invention discloses a cement grinding aid and a preparation method thereof. The cement grinding aid is prepared from the following components by mass content: 5 to 10% of polyethylene glycol, 5 to10% of sorbitol, 1 to 3% of polyglycerol fatty acid ester, 5 to 10% of diethanolisopropanolamine, 5 to 10% triisopropanolamine, 1 to 5% of sodium hydroxide, 2 to 8% of sodium polyacrylate, 1 to 5% ofmicrocrystalline cellulose and the balance of water. The cement grinding aid disclosed by the invention has the beneficial effects that no matter which can affect concrete performance and building service life and has harm to human health is doped into the cement grinding aid, so that the cement grinding aid has safety and environmental friendliness; all the raw materials have a synergistic effect, so that cement fineness reduction is facilitated, reasonable particle size distribution of the cement grinding aid is guaranteed, an early hydration heat release rate of cement where mineral admixture is doped is reduced, and cement strength is improved; under the condition of guaranteeing cement strength and use, production cost can be reduced, and economical benefit and social benefit of cement production enterprises are improved.

The invention discloses a high-degradation rate diversion layer material and a preparing method thereof, and relates to the field of disposable hygiene products. The high-degradation rate diversion layer material is prepared through selection of polylactic acid fiber with different hydrophilicity and water repellency properties, different thicknesses and different melting points, and selection of reasonable technological parameters during reinforcing of a hot air oven. The prepared high-degradation rate diversion layer material is composed of an upper fibre web and a lower fibre web, wherein the upper fibre web is a disordered fibre web formed through air laying, the lower fibre web is a carded and directly laid web, and the upper fibre web and the lower fibre web are made into a high-degradation rate diversion layer with high using strength through hot air reinforcing. The technical problem that a diversion layer material is hard to degrade and poor in diversion performance, instant absorptivity and temporary liquid storage capacity, causing side leakage liability and serious reverse osmosis of disposable hygiene products is solved. The diversion layer material has excellent diversion performance, high liquid storage capacity, high instant absorptivity, and a high biodegradation rate.

The invention relates to the technical field of optical fiber and pigment color pastes and particularly relates to an UV (ultraviolet) color paste capable of being used for optical coloring printing ink. The color paste is prepared from the following components in percentage by weight: 10-50% of pigments, 30-70% of an active diluent, 3-20% of polyurethane acrylate, 1-2% of a defoaming agent and 3-10% of a wetting dispersant, totaling 100%. The color paste has the advantages of being fast in grinding speed, bright in color and easy to distinguish, good in lightness, strong in covering power, strong in coloring power and the like and is particularly suitable for preparing optical fiber coloring printing ink.

A woven fabric includes a first constituent yarn having an optical fiber yarn and a non-light guiding yarn and a second constituent yarn having a non-light guiding yarn. The woven fabric has a first region in which the first and second constituent yarns are woven in one layer and a second region which is positioned adjacent to the first region and in which the first and second constituent yarns and are woven in two or more separable layers. The woven fabric has an optical fiber layer and a back protecting layer as the separable layers. The optical fiber layer is a layer formed of the optical fiber yarns. The back protecting layer is a layer in which the non-light guiding yarn of the first constituent yarn and the non-light guiding yarn of the second constituent yarn are woven. Further, the woven fabric can further comprise a front protecting layer.