224 results about "Draw ratio" patented technology

The invention discloses a preparation method of straw micro-nano cellulose, relating to a preparation method of micro-nano cellulose. The invention solves the problems that the prior art for preparing nano cellulose comprises more steps, and rodlike nano cellulose has low draw ratio. The preparation method is as follows: 1, stewing; 2, dipping and washing; 3, screening; 4, bleaching; 5, carrying out hydrolysis and supersonic treatment; and 6, neutralizing, rinsing, breaking, decentralizing and drying to obtain the straw micro-nano cellulose. The micro-nano cellulose prepared by the preparation method of the invention has fibroid appearance, has the diameter of 10-200 nm and the length of 200-10 mu m, and has high draw ratio and large specific surface area. The invention is applied to the field of composite materials.

A multi-ply absorbent sheet includes at least a first and second ply bonded together. In one construction, the first and second ply are provided with from about 90% by weight to about 25% by weight pulp-derived papermaking fiber and from about 10% to about 75% by weight fibrillated regenerated cellulosic microfiber having a characteristic CSF value of less than 175 ml; the sheet having a caliper of from 180-250 mils/8 sheets and exhibiting a wipe-dry time of less than 20 seconds, an SAT capacity in the range of 350-500 g/m², an SAT rate in the range of 0.05-0.25 g/s^0.5, a CD wet tensile in the range of 400-2500 g/3″ and a wet/dry CD tensile ratio of from 35% to 60%. The multi-ply sheets are efficient, high capacity wipers and have enough absorbent capacity to be used as ordinary paper towels. Preferred wiper towel products exhibit a differential pore volume for pores under 5 microns in diameter of at least about 75 mm³/g/micron.

A spin finish which enhances yarn processability and contributes to improved yarn performance. The spin finish is advantageous when compared with conventional spin finishes applied to industrial yarn because the present spin finish enhances yarn processability as evidenced by low forming, improved mechanical quality at lower amounts of spin finish per yarn, improved mechanical quality at higher draw ratios, and minimal depositing. It also improves yarn performance as evidenced by improved strength and wicking.

The invention discloses a method for preparing a high-strength carbon fiber, belonging to the technical field of the carbon fiber. The method comprises the following steps of: pre-oxidizing a polyacrylonitrile (PAN) copolymer fiber under air atmosphere at the temperature of between 200 DEG C and 280 DEG C; performing heat treatment for 50 to 70 minutes in a four-section to seven-section gradient heating mode; keeping at a temperature zone with heat treatment temperature of 250 DEG C for 9+/-3 minutes; and carbonizing the pre-oxidized fiber under conventional carbonizing conditions, namely carbonizing the fiber under protection of a nitrogen gas at the draw ratio of -4 to +8 percent and at the low temperature of between 300 DEG C and 900 DEG C for 3+/-1.5 minutes, and carbonizing the fiber at the high temperature of between 1,200 DEG C and 1,600 DEG C and at the draw ratio of -4 to +1 percent for 2+/-1 minutes. The carbon fiber prepared by the method has a perfect structure and excellent mechanical property. The tensile strength of the obtained carbon fiber reaches over 3.8GPa.

A soft stretch yarn substantially comprising polyester fibers has a stress, at 50% yarn stretch, of no more than 30x10-3 cN/dtex and, at the same time, a percentage recovery of at least 60%. Preferably, the Uster unevenness is no more than 2.0% and the crimp diameter is no more than 250 mum. This soft stretch yarn can be produced by spinning yarn of conjugate fibers comprising two types of polyester in which one component is PTT at a take-up velocity of at least 1200 m/min, drawing at a drawing temperature of 50 to 80° C. at a draw ratio such that the drawn yarn tensile elongation is 20 to 45%, and then heat setting.

The invention relates to a heat-conducting, wear-resistant and insulated nylon 6 composite material and a preparation method thereof. The material is composed of the following raw materials in percentage by weight: 20-50% of PA 6, 10-30% of fibrous heat-conducting fillers, 15-30% of insulated heat-conducting powder A, 5-10% of insulated heat-conducting powder B, 5-15% of heat-conducting wear-resistant powder, 0.75-1.5% of coupling agent, 3-10% of compatibilizer, 0.2-0.5% of antioxidant and 0.2-0.5% of lubricant. According to the heat-conducting, wear-resistant and insulated nylon 6 composite material provided by the invention, heat-conducting fillers with different particle sizes, different shapes and different draw ratios are compounded so that the fillers are more uniformly distributed in a plastic matrix so as to form a heat-conducting network more easily. Since a low-feeding high-shearing extrusion process is used in the invention, an extruder is at a hungry state to achieve an effect of dispersing the fillers more uniformly. When the fibrous heat conducting fillers are added, a single screw extruder is used, so that the fibers can be sheared into smaller size, the damage is smaller, and meanwhile, the fillers are dispersed more uniformly by extruding the fillers by the extruder for the second time; and the heat-conducting, wear-resistant and insulated nylon 6 composite material provided by the invention has the advantages of good heat conducting effect, excellent wear resistance, easy workability, etc.

The invention belongs to the technical fields of a novel material as well as preparation, and particularly relates to mesoporous graphene foam as well as a preparation method thereof. The invention realizes hydrothermal preparation of a magnesium oxide texture structure and preparation of the mesoporous graphene foam by using textured magnesium oxide as a template. The mesoporous graphene foam material has abundant mesoporous structures and excellent electric property and can be used as an electrode material of batteries and supercapacitors, so that the energy density and the power density of the batteries or the supercapacitors are expectedly improved to a great extent. The cycling stability of the mesoporous graphene foam material is increased, and the mesoporous graphene foam material combined with materials with high draw ratio or the mesoporous graphene foam material can soften energy storage apparatuses. The advantages have important meaning for realization of commercialization of a new generation of energy storage apparatuses for electromobiles and development of smaller, lighter and flexible portable mobile power supplies. The business prospect is wide. Meanwhile, preparation processes of the high temperature hydrothermal method and a fluidized bed can realize engineering enlargement, so that the method is expected to be industrialized.

Stretch films are disclosed, the films having at least one layer formed of or including a polyethylene copolymer and having a natural draw ratio of at least 250%, a tensile stress at the natural draw ratio of at least 22 MPa, and a tensile stress at second yield of at least 12 MPa. In some embodiments, the polyethylene copolymer can have a CDBI of at least 70%, a melt index I2.16 of from 0.1 to 15 g/10 min., a density of from 0.910 to 0.940 g/cm<3>, a melt index ratio I21.6/I2.16 of from 30 to 80, and an Mw/Mn ratio of from 2.5 to 5.5. The stretch films are particularly useful in bundling and packaging applications.

The invention relates to a chitin nano-whisker, a chitin nano-fiber and a preparation method thereof. In the present invention, chitin is added to the organic acid aqueous solution, stirred and heated to obtain a dispersion liquid and centrifuged to obtain a solid mixture, which is added to an alkali solution for neutralization and then left to stand for centrifugation; water is added for washing, centrifuged, left to stand for stratification, and the upper suspension is collected to obtain chitin nanocrystals The whisker dispersion liquid, the solid precipitate in the lower layer is quantitatively diluted with water and then homogeneously treated to obtain the chitin nanofiber dispersion liquid. The present invention uses chitin as a raw material to directly prepare two-scale chitin nanomaterials, that is, its nano whiskers and nanofibers, which expands the application space of chitin materials, and prepares chitin nanomaterials homogeneously through weak acid hydrolysis and a homogenizer , the process acid recovery rate is high, environmental protection, low cost, it is a new way to prepare chitin nano-materials, and can produce two kinds of nano-chitin materials with different aspect ratios in the same process, which is the application of chitin And quantitative production provides new prospects and ways.

Single-ply absorbent tissue paper wherein of the fibers incorporated in the web: (a) at least 20% by weight have a coarseness exceeding 23 mg/100 m; (b) at least about 20% by weight have a coarseness of less than about 12 mg/100 m; and (c) the weight average fiber coarseness to length ratio is less than about 8.5 mg/100 m/mm. The single-ply tissue having: a serpentine configuration; low sidedness; a basis weight of at least about 12.5 lbs. per 3000 square foot ream; specific total tensile strength between 40 and 200 g/3 inches/lb per 3000 square foot ream; a cross direction specific wet tensile strength between 2.75 and 20.0 g/3 inches/lb per 3000 square foot ream; an MD tensile to CD tensile ratio between 1.25 and 2.75; a specific geometric mean tensile stiffness between 0.5 and 3.2 g/inch/% strain per pound per 3000 square foot ream; a friction deviation less than 0.250; and a sidedness parameter less than 0.30.

The invention relates to double perovskite type inorganic nano fiber and a preparation method thereof and belongs to the field of inorganic nano fiber materials. The preparation method comprises the following steps: mixing polyvinylpyrrolidone with a solvent to obtain a spinning precursor solution, and performing electrostatic spinning, preoxidation and carbonization to the spinning precursor solution to obtain the double perovskite type inorganic nano fiber; the spinning precursor solution comprises the following components in mass percent: 10% to 20% of inorganic salt, 10% to 30% of polyvinylpyrrolidone and the balance of solvent, wherein the inorganic salt is the mixture of lanthanum salt, cobalt salt and metal salt III, the molar ratio of the lanthanum salt, the cobalt salt and the metal salt III is 2:1:1, and the metal salt III is nickel salt, ferric salt or manganese salt. The invention has the advantages that the preparation method is simple and easy to implement, the raw material consumption is low, the product purity is high, and the obtained double perovskite type inorganic nano fiber has a stable one-dimensional structure, is relatively high in draw ratio and uniform in diameter.

The present invention provides a high strength, high toughness steel wire rod useful for a PC steel wire, galvanized steel strands, spring use steel wire, cables for suspension bridges, etc. By hot rolling, then directly patenting or reaustenitizing, then patenting a high carbon steel wire rod of a specific chemical composition of the steel and chemical composition, size, and numerical density of inclusions, piano wire rod or high carbon steel wire rod having a structure of mainly pearlite, having an average value of the proeutectoid cementite area ratio of 5% or less in a center region of less than 20% of the wire rod diameter from the center of the wire rod, having a micromartensite size of the C section of 100 μm or less, having a tensile strength of the 170 kgf/mm² class or more, and having a drawing ratio at break of 30% or more is obtained.

The invention relates to a polypropylene/doped oxide composite functional fiber preparation method, comprising the following steps: (1) mixing the dried polypropylene matrix and the oxide powder evenly; (2) adjusting the temperature of a twin-screw extruder to 160-220 DEG C, adding the mixed powder, squeezing out, cooling, cutting into grains and obtaining spinning masterbatch; (3) adding the masterbatch in a spinning machine to obtain freshly formed filament; (4) drafting the freshly formed filament with a extension drawing ratio of 2-6 times to obtain the composite functional fiber of the invention. The preparation method of the invention has simple production equipments and easy-realizable industrialized production, the composite functional fiber prepared by the invention has the functions of absorbing electromagnetic wave, reducing infrared emissivity, restraining bacteria, resisting ultraviolet radiation, preventing aging and the like, and the fiber can be widely used in various fields such as textiles with the functions of preventing electromagnetic wave radiation, restraining bacteria, resisting aging and resisting static electricity and the like.

The invention relates to an efficient photocatalyst for a bismuth vanadate nanorod and a preparation method of the catalyst. The morphology of the catalyst is rodlike, the size is nano-scale, the diameter of the nanorod is 15-30nm, the draw ratio is 5-40, the specific surface area is 28.2m<2>.g<-1>, the crystal phase is a monoclinic scheelite phase, and the growth direction is [010] direction. The preparation method comprises the following steps: firstly, dissolving bismuth nitrate pentahydrate, and sodium oleate or oleic acid into water, acutely stirring, and then adding ammonium metavanadate to a mixed solution; carrying out water heating for 6-48 hours under the condition at 70-200 DEG C, and centrifugally washing and drying to obtain the bismuth vanadate nanorod. Compared with the prior art, the synthesis method adopted by the invention is simple in equipment, convenient to operate, short in synthesis cycle, high in repeatability, few in raw material species, low in cost, environmental friendly, free of pollution and high in yield, the prepared bismuth vanadate nanorod is high in adsorption capacity, and the toxic pollutants and decomposition water can be abnormally efficiently degraded under radiation of an ultraviolet light, a visible light and a natural light.

The embodiment of the invention discloses a method for preparing polypropylene melt with high melt strength, which uses alkadiene as a modified monomer, thus improving the tensile property of the polypropylene melt with high melt strength due to good compatibility of the alkadiene and polypropylene resin. In addition, the alkadiene monomers can perform grafting reaction with the polypropylene melt, and the alkadiene monomer has lower activity, thus inhibiting cross-linkage reaction so as to expedite the grafting reaction in a certain degree and ensure polypropylene to have higher melt strength. Therefore, the polypropylene melt with high melt strength prepared by the method provided by the invention not only has higher melt strength, but also has larger draw ratio and excellent melt ductility.

The present invention discloses applications of PHBV as a novel natural antibacterial material in textile product preparation. According to the present invention, the mixture of pure PHBV or a PHBV copolymer and other polymers or copolymers is injected into extrusion equipment with a heating device, melting is performed, fibers are collected at a temperature of 170-225 DEG C under 300-3000 m/min, and FDY long fibers are prepared according to a drawing ratio of 2-4, or short fibers are prepared according to a conventional short fiber process; during the preparation of fabrics, the fabric can be prepared completely from the PHBV long yarn or the short-fiber yarn, and can further be prepared by carrying out mixed weaving or blending on the PHBV fibers and other fiber materials; PHBV as the completely bio-based novel natural environmentally-friendly antibacterial material has characteristics of high antibacterial rate, lasting antibacterial property, no toxicity, no harm, good biocompatibility and the like; and various fabrics having different PHBV fiber contents of the present invention have excellent antibacterial property, and can maintain the good antibacterial function after water washing 20 times.

The method relates to a method for producing bright polyester staple fibers, belonging to the chemical fiber production technical field. The invention is characterized in that: the method prepares the bright polyester staple fibers through addition of permanent white additives on a certain position of a polycondensation device for polyreaction and utilization of a specially designed spinneret plate and the specially optimized circular-blow wind cooling technique. Because the added permanent white during the process of polycondensation, the method can make the fibers reach the effect of brightness when no TiO2 is added and simultaneously improve the postprocessing properties of the bright staple fibers; the spinneret plate special for spinning the bright staple fibers and circular-blow non-woven fabric reselection are designed, thereby the method reduces the frequency for repairing the spinneret plate, improves the uniformity of bright protofilaments, optimizes various parameters of circular-blow wind, effectively improves the tensile property of the bright protofilaments and not only meets the requirements of high mightiness of the bright staple fibers on high draw ratio of postprocessing but also guarantees high running rate of a postprocessing device.

The invention relates to a method for preparing a BaTiO3 nanowire through a two-step salt melting method and belongs to the technical field of BaTiO3 nanowires. The two-step salt melting method is adopted, the first step salt melting process is carried out, BaCO3 and TiO2 are taken as raw materials, NaCl and KCl eutectic salt with the ratio of the NaCl and the KCl being 1:1 serves as a medium, a BaTi2O5 nanowire is obtained and serves as a template, the second step of salt melting process is carried out, and a pure-phase BaTiO3 nanowire material with the large draw ratio is synthesized. The production method is simple in process and low in energy consumption, the BaTiO3 nanowire has the large draw ratio and the even appearance. A new approach capable of massively preparing the BaTiO3 nanowire is provided.

The invention relates to a glitter slub polyester filament yarn, wherein, triangular pre-oriented yarns (POY) are produced by modification of spinning filaments through a spinneret plate and the yarns have the characteristic of glitter; the triangular pre-oriented yarns are processed into slub yarns by adoption of a special drafting technique during the post processing process of the POY; and the post processing drafting technique is to adopt a small draw ratio (between 1.4 and 1.46) and a relatively high setting temperature to process the slub yarns into finished products DTY, namely the glitter slub polyester filament yarn. Textile fabrics woven by fibers have flowery color and can be widely used for manufacturing an evening dress, a performance costume, an ornament, a fashion dress and so on.

The invention provides a shape memory material on the basis of polylactic acid and a preparation method thereof. The shape memory material is characterized by consisting of the polylactic acid and hyper branched polyesteramide, wherein, the weight portion of the polylactic acid is between 80 and 98 portions and the weight portion of the hyper branched polyesteramide is between 2 and 20 portions. The shape memory material has the advantage that various performances of a product such as the mechanical intensity, the breaking elongation and the degree of crystallinity can be controlled by changing the ratio of the hyper branched polyesteramide to the polylactic acid and mixing the two. The general polylactic acid material is easy to rupture when subject to a stretching or bending stress. The polylactic acid material overcomes the shortcoming of brittleness of the pure polylactic acid and has high toughness and elongation at break. Therefore, the polylactic acid material does not break at a high draw ratio, can restore to the prior shape by being heated and has good shape memory effect.

The invention discloses a method for preparing PAN (polyacrylonitrile) fiber. The method comprises the following steps of synthesizing a spinning solution by means of taking AN (acrylonitrile) as monomer and DMSO (dimethyl sulfoxide) as solvent, and performing polymerization reaction on the AN and the DMSO so as to generate a PAN solution; preparing PAN precursors by utilization of a wet spinning technology, squeezing PAN slurry through a spinneret plate after metering and filtering, solidifying in an organic solution DMSO to form tows, washing the tows in a clear water bath with a temperature of 40 to 60 DEG C, then drawing the tows in steam with a temperature of 110 to 130 DEG C at a whole drawing ratio of 1.5 to 2.0, then drying and oiling, and then loosening and sizing according to a drawing ratio of 0.8 to 0.9, and finally rolling manually for later use. The PAN fiber prepared according to the method disclosed by the invention has the advantages that the PAN fiber not only has a good bunching property, is not liable to disperse, but also has higher strength and better softness.