65results about How to "Crystallization perfect" patented technology

The invention relates to a high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material. The blend material comprises the following raw materials by weight: 60 to 100 parts of UHMWPE, 5 to 12 parts of HDPE, 6 to 16 parts of LLDPE, 0.1 to 3 parts of a high-molecular-weight polymer nucleating agent and 1.5 to 3 parts of a flow modifier. The high-molecular-weight polymer nucleating agent has the advantages of no odor, good dispersibility, good compatibility, capacity of realizing heterogeneous crystallization, a high degree of crystallization and a small application amount; the high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material retains original characteristics of polyethylene UHMWPE and has obviously improved tensile strength, impact strength, bending strength, Vicat softening temperature, elongation at break and Shore hardness and a reduced mortar wear rate.

The invention discloses a composite master batch with thermal shrinkable and antistatic functions and a preparation method and an application thereof. The composite master batch comprises the following components according to the following weight percentages: 70 percent to 95 percent of polypropylene carrier resin, 1 percent to 10 percent of lubricant, 2 percent to 20 percent of antistatic agent, 0.1 percent to 5 percent of crystal regulator and 1 percent to 10 percent of surfactant. The preparation method of the composite master batch comprises the following steps: (1) every component is weighed according to weight percentage; (2) all components are added into a twin-screw extruder for fusion, mixing and extruding, the rotating speed of the twin-screw extruder is 200 r/min to 500r/min and the temperature is 180 DEG C to 230 DEG C; and (3) the mixed material extruded is removed of water, granulated and dried so as to obtain the composite master batch. The composite master batch can be applied to the production of polypropylene film, can improve the thermal shrinkage rate and the stability of the thermal shrinkage rate, and has antistatic effect.

The invention relates to nano-silver powder used for DC electrode sizing agents and low-temperature bonding nano-silver paste, and a manufacturing method thereof. The physical properties of nano-silver powder are as follows: particle size distribution between 10 and 100 mu m, average particle size between 20 and 50 nm, specific surface area between 30 and 50 m2/g, and apparent density between 1.5 and 3.0 g/cm3. The nano-silver powder adopts a chemical reduction method and is prepared by adopting hydrazine hydrate, glycerine or triethanolamine to reduce silver compounds at 90 to 92 DEG C. The nano-silver powder manufactured by the method is applied to the DC electrode sizing agents sintered at 800 DEG C. When the nano-silver powder is applied to the nano-silver paste of SiC or GaN and other chips bonded at 260 to 270 DEG C, electrodes have the advantages of good weldability, high conductivity, stable electrical property, high bonding strength, high reliability and the like.

The invention discloses a metal oxide nanoparticle and a preparation method of the metal oxide nanoparticle, which comprises the following steps: preparing an organosol containing the metal element, mixing the organosol with a water-soluble salt, performing standing or centrifuging to precipitate the water-soluble salt, removing the superfluous organosol at the upper part, and keeping the temperature to convert the organosol into gel; along with evaporation of the solvent, shrinking the gel, and coating the surfaces of the water-soluble salt particles with a layer of xerogel film; and calcining the sample at a high temperature between 400 DEG C and a salt melting point, converting the dry gel film into metal oxide nanoparticles, dispersing and attaching the nanoparticles to the surfaces ofwater-soluble salt particles, cooling, and washing with water to remove the salt, thereby obtaining the high-dispersion metal oxide nanoparticles; if the calcined product is reduced in a reducing atmosphere, converting the metal oxide nanoparticles attached to the surfaces of the water-soluble salt particles into corresponding metal nanoparticles, cooling, and washing with water to obtain the high-dispersion metal nanoparticles. According to the method, the high-crystallinity and high-dispersion metal oxide and metal nanoparticles can be rapidly prepared in batches.

The invention relates to a polyetheretherketone hollow fiber preparation method and belongs to the technical field of organic fiber preparation. The problem that polyetheretherketone fibers prepared by a hollow fiber preparation method in the prior art is mainly to be solved. The polyetheretherketone hollow fiber preparation method includes subjecting special spinning-class polyetheretherketone to melt extrusion by a screw in an extruder, using a melt dosing pump for controlling the discharge amount, filtering melts through a filtering system of a component, and forming polyetheretherketone hollow fiber strips through a hollow spinneret plate; drafting the polyetheretherketone hollow fiber strips, cooling according to different cooling modes, and using a winding device for collecting as-spun fibers; guiding the as-spun fibers into a hot-drawing sizing device so as to obtain polyetheretherketone hollow fibers. The polyetheretherketone hollow fiber preparation method is simple, convenient and high in universality. The polyetheretherketone hollow fibers prepared by the preparation method have the advantages of high quality stability, high strength, high tenacity, high uniformity, excellent wear resistance and the like, and can be used for wear-resisting fabrics, thermal protection, lightweight materials and the like, thereby being quite promising in application prospect.

The invention provides a thermotropic liquid crystal polyarylater monofilament heat treatment device and a heat treatment method thereof. The heat treatment device is a heated vacuum airtight box body, and a pay-off roller, a heating tension roller and a take-up roller are sequentially arranged in the box body. A heating device and a vacuum suction device are respectively arranged outside the box body. A monofilament is fed into the heated vacuum heat treatment device to perform heat treatment. The thermotropic liquid crystal polyarylater monofilament is heated and drafted in the closed box body, oxidative degradation of the monofilament is avoided, strength unevenness and drawing irregularity of the monofilament are reduced, and the strength and modulus of the monofilament are improved. The heat treatment method is simple in operation and easy to implement, and the problems of existing complicated polyester fiber heat treatment steps and fiber oxidation degradation are solved.

The invention provides a method for effectively improving the afterglow intensity of Sr<2>MgSi<2>O<7>:<x>Eu<2+>, <y>Dy<3+> phosphor powder and prolonging the afterglow time of the Sr<2>MgSi<2>O<7>:<x>Eu<2+>, <y>Dy<3+> phosphor powder by means of do-doping by the aid of Li<+>. The method has the advantages that Sr<2+> sites can be replaced by the Li<+> to form Li'Sr with monovalent negative charge during Li<+> co-doping, and accordingly oxygen vacancy with positive charge can be correspondingly generated to complement charge difference and can be used as a trap for capturing electrons and holes in excited states; captured electrons and holes can be gradually released for heat energy and can be recombined with one another, and phosphorescence can be released and is long-afterglow; oxygen vacancy can be continuously increased along with Li<+> doping, captured electrons can be continuously increased, and accordingly the long-afterglow time can be effectively prolonged; the Li<+> is used for compensating charge, and accordingly the charge is in compensation balance when bivalent Sr<2+> is replaced by trivalent Dy<3+>; the Li<+> further can be used as a fluxing agent, the crystallinity of crystals can be effectively improved, the particle sizes of the crystals can be increased, accordingly, crystallization can be improved, and the luminescence intensity of the long-afterglow can be ultimately improved.

The invention discloses a method modifying aramid fibers in a supercritical carbon dioxide environment to increase mechanical performance and surface performance. The method includes the steps of firstly, washing and drying the aramid fibers; secondly, loading the aramid fibers and a reagent into a sealed container, and allowing the aramid fibers to keep tension and not to contact with the reagent; thirdly, feeding carbon dioxide, and heating to rise temperature and pressure to allow the interior of the sealed container to be in a supercritical carbon dioxide state; fourthly, after the swelling reaction, slowly relieving pressure in a constant-speed manner to obtain the modified aramid fibers; fifthly, washing and drying the modified aramid fibers. The method has the advantages surface activation and longitudinal tensile strength increasing of the aramid fibers are achieved, fiber skin layer and core layer combination is reinforced through the crosslinking reaction among molecular chains inside the fibers, the skin-core structure is improved, fiber transverse strength is increased, and the method is of important significance to the modification and use efficiency increasing of thearamid fibers.

The invention relates to silica optical fiber modification, aiming at providing an ITO film loaded silica optical fiber and a preparation method thereof. The silica optical fiber is taken as base body, and indium tin oxide transparent and conductive film is coated on the surface. In the invention, simple and feasible pre-treatment is carried out on the silica optical fiber, so that ITO film obtained by sol-gel method is firmly combined with the surface of the silica optical fiber, crystallization of film is complete, surface is smooth and compact, and photoelectric properties are good, thus preparing an ITO film loaded silica optical fiber and giving both light guiding property and electrical conductivity to the fiber. The invention can be widely applied to the fields of infrared transmission, current sending and photoelectric response devices, thus greatly widening respective application field.

The invention discloses a wear-resisting and heat-resisting modified polyvinyl chloride composite. The composite is prepared from components of raw materials as follows: polyvinyl chloride, polyurethane elastomers, chlorosulfonated polyethylene, nitrile rubber, polyvinylidene fluoride, ethylene-methyl methacrylate copolymers, polypropylene fibers, plant fiber, basalt fibers, nano calcium carbonate, diatomite, dipentaerythritol adipate, calcium stearate, zinc stearate, glyceryl stearate, olive oil, polyepichlorohydrin, a coupling agent, polyethylene wax grafted maleic anhydride, adipic acid, acetyl tributyl citrate, diphenyl cresol phosphate, zinc hydroxy stannate and vanadium pentoxide. The wear-resisting and heat-resisting modified polyvinyl chloride composite has high wear resistance, good heat resistance, excellent ageing resistance and long service life.

The invention provides a bending-deformation-resistant frosted PC (polycarbonate) composite material which is prepared from a PC (polycarbonate) resin, glass fibers, frosted powder, calcium sulfate whiskers, an antioxidant, a dispersing agent and a flame retardant. The glass fibers and frosted powder are mixed according to the specific proportion, and the weight ratio of the glass fibers, frosted powder and calcium sulfate whiskers is limited, thereby implementing better dodging effects.

The invention discloses a low-cobalt hard alloy material and a manufacturing method of the low-cobalt hard alloy material. The manufacturing method specifically comprises the steps that 80 parts of WCpowder, 4-16 parts of carbonyl iron powder, 1-5 parts of carbonyl nickel powder and 2-15 parts of reduced cobalt powder serve as raw materials, the raw materials are preprocessed, presintered, sintered again and subjected to heat treatment after sintering is accomplished, and then low-cobalt hard alloy is obtained, wherein the particle size of the WC powder is 400. The comprehensive performance of the obtained low-cobalt hard alloy is same to the comprehensive performance of conventional WC-20%Co hard alloy, and the hardness and the compactness of the low-cobalt hard alloy are higher than those of the WC-20%Co hard alloy.

The invention provides a method for preparing yttrium aluminum garnet nanoparticles, which comprises the following steps: preparing organic sol containing aluminum and yttrium, mixing the organic solwith water-soluble salt, performing standing or centrifuging to precipitate the water-soluble salt, removing superfluous organic sol at the upper part, and keeping the temperature to convert the organic sol into gel; along with evaporation of the solvent, contracting the gel, and coating the surfaces of the water-soluble salt particles with a layer of xerogel film, and calcining a sample at a hightemperature between 600 DEG C and a salt melting point, converting a dried gel film into yttrium aluminum garnet nanoparticles, dispersing and attaching the yttrium aluminum garnet nanoparticles to the surfaces of water-soluble salt particles, cooling, and washing with water to remove the salt, thereby obtaining the yttrium aluminum garnet nanoparticles with favorable dispersity and crystallinity. According to the method, the high-dispersion and high-crystallinity yttrium aluminum garnet nanoparticles can be rapidly prepared in batches, and the method is suitable for preparing LED fluorescentpowder, YAG transparent ceramic and other materials.

The invention relates to a preparation method of a fast-fired colorful starry-sky bright glaze ceramic container. The preparation method comprises the following steps: (1) preparation of a blank; (2) biscuiting; (3) preparation of a glaze; (4) glazing; (5) glaze firing; and (6) inspecting. According to the invention, a glaze surface is good in quality, unique in color and texture, short in a firing period and integrally environment-friendly and safe.

The invention discloses a polyester resin composition which comprises the following components in parts by weight: 100 parts of PCT resin; 0-50 parts of a reinforcing material; and 0.1-0.8 part of a hyperbranched polyester; wherein the molecular weight of the hyperbranched polyester is 600-10000 g/mol, and the hydroxyl value of the hyperbranched polyester is 200-600 mg KOH/g. By adding specific parameters and a specific amount of hyperbranched polyester, the defect of insufficient dimensional stability of the PCT resin can be improved, and cold crystallization is inhibited.