222results about How to "Slow crystallization rate" patented technology

The invention belongs to the field of spinning materials. Firstly, the invention provides a fine denier/superfine denier nylon master granule prepared by proportionally adding a modifying agent, an antioxidant and a dispersant to nylon 6 sliced sheets according to the proportion, melting, mixing and extruding, and the modifying agent is a metallic salt which can take effect on nylon base; The fine denier/superfine denier nylon master granule and the nylon 6 sliced sheets are proportionally mixed, melted and spun, and the fine denier/superfine denier nylon POY is prepared by cooling, oiling, bundling and coiling; and the POY is textured to obtain the DTY. The invention provides the fine denier/superfine denier nylon POY of which the filament size is 0.3-0.8dtex, the filament size of the DTY is 0.25-0.70dtex, which fills the vacancy that the fine denier/superfine denier nylon POY and the DTY are produced by the conventional yarn-spinning process at home and abroad.

The present invention relates to biodegradable PHA copolymers comprising at least two randomly repeating monomer units. The present invention further relates to a plastic article comprising a biodegradable copolymer, wherein the biodegradable copolymer comprises at least two randomly repeating monomer units (RRMU) wherein the first RRMU has the structurewherein R1 is H, or C1 or C2 alkyl, and n is 1 or 2; the second RRMU has the structureand wherein at least 50% of the RRMUs have the structure of the first RRMU. The present invention further relates to an absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet comprising a film comprising a PHA of the present invention and an absorbent core positioned between the topsheet and the backsheet.

The present invention relates to biodegradable PHA copolymers comprising at least two randomly repeating monomer units. The present invention further relates to a plastic article comprising a biodegradable copolymer, wherein the biodegradable copolymer comprises at least two randomly repeating monomer units (RRMU) wherein the first RRMU has the structure wherein R1 is H, or C1 or C2 alkyl, and n is 1 or 2; the second RRMU has the structure and wherein at least 50% of the RRMUs have the structure of the first RRMU. The present invention further relates to an absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet comprising a film comprising a PHA of the present invention and an absorbent core positioned between the topsheet and the backsheet.

The present invention relates to biodegradable PHA copolymers comprising at least two randomly repeating monomer units. The present invention further relates to a plastic article comprising a biodegradable copolymer, wherein the biodegradable copolymer comprises at least two randomly repeating monomer units (RRMU) wherein the first RRMU has the structure wherein R1 is H, or C1 or C2 alkyl, and n is 1 or 2; the second RRMU has the structure and wherein at least 50% of the RRMUs have the structure of the first RRMU. The present invention further relates to an absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet comprising a film comprising a PHA of the present invention and an absorbent core positioned between the topsheet and the backsheet.

The antistatic nano composite polyester fibre is made of polyester or modified polyester, promotor and nano powder body through the processes of mixing and melt-spinning, in which the promotor is a condensation product of copolyester containing metaphenylene and polyethylene glycol, and can effectively improve dispersion property of nano powder body in the polyester or modified polyester, and possesses antistatic synergistic effect, and said nano powder body is a metal oxide with good conductivity.

The invention relates to a flame retardant PTT polyester fiber and production method thereof, wherein the polyester comprises a phosphor based copolymerization flame retardant accounting for 1.2-8.5% of the total weight of the polyester and the phosphor based copolymerization flame retardant comprises a double-reaction functional group and the phosphor element quality content in polyester is 1400-12000ppm and the PTT polyester also comprises an inorganic nano-material accounting for 0.1%-5.0% of the total weight of the polyester and the inorganic nano-material is selected from one kind or several kinds of silicon dioxide, calcium carbonate, magnesium carbonate and barium sulphate. The production method is the improvement of the conventional method, specifically before drying polyester chip, the polyester chip is precrystallized at 110-125 DEG C for 1.5-3 hour and the drying temperature is 130-145 DEG C and the drying time is 3.5-5 hours. The polyester fiber has features of good and permanent flare retardant resistance, high breakdown strength, good fiber forming property, good thermal stability and good thermal oxidation stability performance.

The present invention can provide a distinctive article which includes a plurality of fibers (62), wherein the fibers include a selected polymer, fiber material. In a particular aspect, the fiber material can exhibit a “low” crystallization rate. In other aspects, the fiber material has been subjected to a low fiber-draw percentage, and the polymer in the fibers can have a high crystallinity. Further aspects can include a fiber material which has been subjected to a low fiber-draw speed, and can include fibers which have a high tenacity. In still other aspects, the fibers can be configured to provide a fibrous web (60), and the fibrous web (60) can have a distinctive tensile strength quotient, with respect to tensile strengths along its machine-direction (22) and cross-direction (24).

A web of continuous filaments which are made of at least one semi-crystalline polymeric component covalently bonded as a linear block copolymer with or blended with one or more semi-crystalline or amorphous polymeric components. The filaments are intermingled together to form a porous web of filaments, the filaments having multiple contact points with each other within the web. The filaments are bonded at the contact points without requisite for added adhesive binders, adjuncts or post extrusion melt processing. The web may be bioresorbable. The web may also be provided in forms with relatively high cohesive shear strength. The polymeric components of the filaments exist, at least temporarily, in a homogenous substantially phase miscible uncrystallized state. If preserved in the homogenous substantially phase miscible uncrystallized state, the object can then be manipulated into a distinct desirable molded shape and then subsequently set or crystallized to retain the desired form particularly suitable for a specific use or application.

The present invention relates to a process for recovering lactide from polylactide (PLA) or glycolide from polyglycolide (PGA), in which, in a first step, PLA or PGA is contacted with a hydrolysing medium and hydrolytically degraded to oligomers. In a further step, a cyclising depolymerisation of the oligomers obtained in the first step is effected to give lactide or glycolide. In addition, the present invention relates to an apparatus based on the combination of a hydrolysis apparatus with a depolymerisation reactor, with which the above-described process can be performed. The core of the process according to the invention is a partial hydrolysis of the polymeric materials originally used in combination with a cyclising depolymerisation.

The invention relates to the technical field of battery material preparation, in particular to a preparation method of aluminum-doped cobaltosic oxide. The preparation method specifically comprises the following steps of: step 1, solution preparation: preparing an aluminum-doped cobalt solution and an ammonium bicarbonate solution; step 2, seed crystal synthesis; step 3, growing of cobalt carbonate; step 4, washing and drying; step 5, calcining; and step 6, mixing and packaging. According to the preparation method of the aluminum-doped cobaltosic oxide, the prepared aluminum-doped cobaltosic oxide is uniform in particle and free of compact blocky particles and particle aggregates.

The invention discloses a polypropylene wire material for 3D printing and a preparation method thereof. The polypropylene wire material is composed of co-polypropylene, low-melting-point homo-polypropylene, inorganic filler, thermoplastic elastomers, a plasticizer and a stabilizer. The polypropylene wire material is low in material crystallinity degree, shrinkage distortion and warping, has good 3D printing effects and printing accuracy, and can reduce cost to a large extent. The preparation method for the polypropylene wire material for 3D printing is simple in technology and lower in production equipment requirement, can achieve large-scale production and popularization, and has a wide market prospect.

The invention discloses a method for preparing a flexible self-supporting metal oxide / graphene nano-composite membrane. The method for preparing the flexible self-supporting metal oxide / graphene nano-composite membrane comprises the following steps: adding the graphene oxide to an organic solvent dissolved in metal salts, and transferring to a hydrothermal reactor after being dispersed evenly to perform hydrothermal reaction at 100 to 140 degrees centigrade for 0.5 to 12 hours; preparing the metal oxide / graphene nano-composite filter membrane through vacuum filtration to form a membrane, washing, evaporating and drying. The method disclosed by the invention has the advantages of simple method, low cost and easy to scale. According to the invention, the metal oxide in the resultant composite membrane is grown uniformly in situ on the surface of the graphene; the average particle size is 1 to 5nm; and the flexible self-supporting metal oxide / graphene nano-composite membrane has a flexible and self-supporting structure, can be bent freely, and is suitable for flexible electronic devices; and if the flexible self-supporting metal oxide / graphene nano-composite membrane is used in electrochemical storage fields such as lithium ion batteries and supercapacitors, the high electrochemical performances such as high specific capacity, ultra-high rate performance and high cycle stability can be realized.

The invention relates to the vegetable and fruit freezing processing field and specifically relates to a processing method of high-quality frozen lotus root slices. The processing method comprises the following steps: performing color-protecting and microwave blanching treatment on lotus roots which are cleaned, peeled and sliced previously, putting the lotus root slices under a vacuum condition and performing permeation treatment on the lotus root slices in a conditioning solution at a temperature ranging from 15 to 25 DEG C for 20-50 minutes, wherein the weight ratio of the lotus root slices to the conditioning solution is 1:1.5 to 1:2.5; draining, and then quickly freezing at a temperature ranging from -40 DEG C to -30 DEG C until the core temperature of the lotus root slices is below -18 DEG C; and putting the frozen lotus root slices in cold storage at a temperature ranging from -22 DEG C to -25 DEG C. The method has the advantages that the storage quality of the frozen lotus root slices is improved, and the obtained high-quality frozen lotus root slices are kept to be good in nutrition, color and luster, and brittleness.

The invention discloses a manufacture method for a biaxially oriented PVDF thin film, and relates to the manufacture field of plastic film. The method comprises the steps of adding a proper amount of polymer which is compatible with PVDF, into a PVDF resin to form a blend; blowing and stretching the blend twice by a double-bubble tube twice blowing-stretching film manufacture process, to obtain the PDVF thin film having high orientation degrees in both horizontal direction and vertical direction. Compared with the method of the prior art, the method of the invention can manufacture the biaxially oriented PVDF thin film with better performance, is relatively simple in both manufacture process and equipment, and has low investment for production line.

The invention relates to a Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The method comprises the following steps: dissolving transition metal salt and tartaric acid in deionized water to form a solution A, dissolving sodium ferrocyanide decahydrate and ascorbic acid in deionized water to form a solution B, and dissolving polyvinylpyrrolidone and sodium chloride in deionized water to form a solution C; simultaneously adding the solution A and the solution B into the solution C through a peristaltic pump, and performing stirring while heating in an N2 atmosphere until the solution becomes a suspension liquid after dropwise adding is completed; keeping heating and stirring the suspension for 12 hours, finally aging at room temperature for 24 hours, then centrifugally washing with deionized water and absolute ethyl alcohol for three times respectively, and finally drying in vacuum at 120 DEG C for 24 hours to obtain the Prussian blue positive electrode material.

The invention provides a polyethylene catalyst carrier material with an ultrahigh molecular weight and a preparation method thereof. The preparation method comprises the following steps: mixing a graphene oxide aqueous solution with a silica sol to obtain a mixed dispersion solution; spraying the mixed dispersion solution into liquid nitrogen, performing atomization, then curing instantly, volatizing to remove the liquid nitrogen, and performing vacuum drying to remove water so as to obtain a sample; heating the sample to perform activation reaction, thereby obtaining a graphene oxide/silicon dioxide spherical catalyst carrier material; mixing the graphene oxide/silicon dioxide spherical catalyst carrier material with butyl magnesium chloride in a tetrahydrofuran solution, and stirring for reaction to obtain a reaction product; and cleaning the reaction product, and heating at 600 DEG C for 2 hours to obtain the polyethylene catalyst carrier material with the ultrahigh molecular weight. The catalyst carrier provided by the invention can effectively reduce entanglement of polymer molecular chains, so that a graphene/ultrahigh-molecular-weight polyethylene composite material can be prepared.

The invention discloses a polycrystalline silicon ingot and a casting method thereof, and applies to an ingot furnace which is provided with a top heater, and a thermal insulation bottom plate is arranged at the bottom periphery of a heat radiation platform. The casting method comprises the following steps of: loading a silicon material in a crucible, and heating the silicon material to a molten state; reducing the power of the top heater on the polysilicon ingot furnace, simultaneously opening a shutter to the angle of 25 degrees to 35 degrees gradually, and reducing the surface temperature of a silicone fluid in the molten state to 1400 DEG C-1450 DEG C so that the silicone fluid at the bottom starts crystallizing; continuing gradually opening the shutter to the maximum opening vertical angle, and keeping a stable silicone fluid crystallization rate, wherein the opening speed rate of the shutter is less than the opening speed rate of the shutter in the second step, and the opening speed rate of the shutter is gradually reduced; and maintaining the maximum opening of the shutter until crystallization is finished. The polycrystalline silicon ingot and the casting method thereof provided by the invention solve the problem that the peripheral impurities of the silicon ingot are distributed in a scattering manner through changing a oriented polycrystalline silicon crystallizing process, the property of the polycrystalline silicon ingot is improved, the polycrystalline silicon ingot with good quality and high compound output rate is prepared, the utilization ratio of the silicon material is improved, and the manufacturing cost of the silicon ingot is reduced.