31results about How to "Good dimensional stability at high temperature" patented technology

The invention provides an antistatic polysulfonamide / carbon nano-tube composite material and a preparation method thereof. The polysulfonamide / carbon nano-tube composite material is prepared by adopting a solution blending method in a physical blending technology, taking polysulfonamide as a matrix and adding carbon nano-tubes with different mass fractions, and is prepared into composite fibers or composite films. According to the invention, an ultrasonic blending technology is utilized so that a small amount of the carbon nano-tubes can be uniformly dispersed in the polysulfonamide matrix in nano-scale; as nano particles with excellent electric conductivity, the carbon nano-tubes ensure that the prepared antistatic polysulfonamide / carbon nano-tube composite material has good antistatic properties, and the specific surface resistivity of the composite material reaches 104 to 1,011 omega; moreover, the rigidity and excellent high-temperature dimensional stability, heat resistance and the like of the carbon nano-tubes can be perfectly combined with the tenacity and processability of an organic polymer. The preparation method provided by the invention is simple and convenient in process, strong in operability and low in cost.

The invention provides a production method of a multilayer micro-porous polyolefin diaphragm. The method comprises the following steps: 1, respectively carrying out melt extrusion on polypropylene andinorganic composite polyethylene through adopting three extrusion casting machines, and carrying out multilayer bush die casting to obtain a multilayer composite cast film, wherein the polypropyleneis positioned at the outer layer, and the inorganic composite polyethylene is positioned at the middle layer; 2, carrying out heat treatment on the multilayer composite cast film at 125 DEG C for 0.5h to obtain a multilayer heat-treated film; 3, carrying out cold drawing on the multilayer heat-treated film at -20 DEG C under a drawing ratio of 50% to obtain a heat-treated film having initial porous nucleuses; 4, carrying out hot drawing on the heat-treated film having initial porous nucleuses at 125 DEG C under a drawing ratio of 90%; and 5, fixing the micro-porous film obtained in step 4 at125 DEG C for 20 min in order to obtain the multilayer micro-porous polyolefin diaphragm. The produced micro-porous diaphragm has the advantages of uniform aperture, good heat resistance and good stability.

The invention relates to a method for preparing a work hardening insulation quilt for a high temperature furnace, which comprises the following steps of: 1, cutting, pre-impregnating and airing a soft quilt; 2, adhering the soft quilt by using an adhesive; 3, pressing and curing for forming; 4, performing carbonization treatment; 5, performing high temperature treatment; 6, machining; 7, performing coating treatment; and 8, performing chemical vapor deposition treatment and high temperature treatment, or directly performing high temperature treatment to obtain the work hardening insulation quilt for the high temperature furnace. The method has the advantages of simple technological process and suitability for mass production; and the prepared work hardening insulation quilt has the heat conductivity of less than or equal to 0.5W / m.K, the ash content of less than or equal to 2,000ppm, high mechanical properties and high-temperature dimensional stability and excellent processability, does not generate volatile matters when used in the high temperature furnace, cannot pollute the product, and has important significance for prolonging the service life of the insulation quilt in the high temperature furnace.

The invention relates to the technical field of ceramic cores, particularly to preparation and application methods of a calcium zirconate ceramic core. The preparation method of the calcium zirconateceramic core comprises the following steps of mixing acrylamide, crosslinking agent and absolute ethyl alcohol to obtain a premixed solution; mixing the premixed solution, dispersion, calcium zirconate and mineralizer to obtain a calcium zirconate pulp; mixing the calcium zirconate pulp, initiator and catalysts for mold casting to obtain a calcium zirconate ceramic core blank; powder-sintering thecalcium zirconate ceramic core blank to obtain the calcium zirconate ceramic core. The calcium zirconate ceramic core prepared through the method is high in strength and more applicable to at high temperature casting Nb-Si-based alloy turbine blades, and meanwhile, achieves high-temperature chemical stability, avoids sharp reaction with chemical elements of Nb-Si-based alloy and effectively ensures the quality of the inner cavity of Nb-Si alloy hollow blades.

The invention discloses aromatic polyester polyol, a raw material composition, polyurethane foam and preparation methods. The aromatic polyester polyol comprises the following raw materials: phthalicanhydride, diethylene glycol, aliphatic diol and a catalyst, wherein aliphatic diol is linear diol with a carbon number of 6 to 7; a molar ratio of phthalic anhydride to diethylene glycol is 1: (1.8-2.1); and a molar ratio of diethylene glycol to aliphatic diol is (8.0-13.0): 1. The aromatic polyester polyol of the invention uses cheap raw materials and has low cost; the preparation methods are simple in process, mild in reaction conditions, convenient to operate, reduced in energy consumption and friendly to environment; the aromatic polyester polyol prepared by adding aliphatic diol has goodcompatibility with cyclopentane and good thermal stability; and the polyurethane foam of the invention has high compressive strength, excellent flame retardancy and high dimensional stability at hightemperature.

A series of sealant materials suitable to 800-1000 deg.C are prepared by using microcrystalline glass in system of CaO-Al2O3-SiO2-B2O3. Range of softening temperature of the series of microcrystalline glass is 750-850 deg.C, and range of crystallizatino is 800-1000 deg.C. In warming up procedure, pristine glass softened at 750-850 deg.C is drenched and adhered with ZrO2 electrolyte and Ni-Cr material of bipolar plate. When temperature goes up continuously, integral recrystallization is occurred, and intensity of material is enhanced. Experiments prove that the material suits to sealing use at temperature 800-1000 deg.C: certain mechanical strength and size, wettability, coefficient of thermal expansion, chemical stability and good matching to materials of batteries. The invention possesses advantages of wide range of sealing temperature, easy manufacturing and sealing technique and high cost performance ratio.

The present invention provides a lithium battery composite separator and a preparation method and application thereof. The lithium battery composite separator of the present invention comprises a polymer base film, a ceramic layer and a porous gel layer, wherein the porous gel layer includes inorganic ceramic particles, PVDF-based resin and acrylate-based binder, and any of the lithium battery composite separator The peeling force between the two interfaces is not less than 60N / m; compared with the prior art, the present invention provides a porous gel layer with PVDF resin as the main body, and adds inorganic ceramic particles and acrylates to the porous gel layer. The adhesive can not only improve the positive bonding performance, thermal stability and ionic conductivity of the composite separator, reduce the thermal shrinkage rate of the composite separator, but also effectively improve the peel strength between the layers of the composite separator and reduce the material cost of the composite separator. The composite separator has excellent comprehensive performance, which can improve the performance of lithium batteries.

The invention discloses a polyimide-zirconium dioxide composite nanofiber membrane and a preparation method thereof. The preparation method comprises the steps that a polyamide acid nanofiber membrane is prepared through electrostatic spinning, then the polyamide acid nanofiber membrane is put into zirconium dioxide sol to enable the nanofiber surfaces to be uniformly coated with the zirconium dioxide sol, gradient temperature increasing thermal imidization processing is conducted, and then the polyimide nanofiber membrane of which the surface is coated with a nano-zirconium dioxide layer is prepared. The polyimide-zirconium dioxide composite nanofiber membrane prepared through the method is composed of the zirconium dioxide nanometer layers coating the surfaces of the polyimide nanofibers, the thickness of the zirconium dioxide layer is 10-100 nm, and the diameter of the polyimide fibers is 30-600 nm. Accordingly, through coating of the zirconium dioxide nanometer layers, the surface wettability, the size stability, the mechanical property and the temperature resistance of the polyimide fiber membrane are improved; in addition, the implementing process is easy, processing is easy to achieve, and the application prospect is good.

The invention discloses a ceramic fiber-reinforced polyimide electric insulation composite material, which relates to the technical field of ceramic-based composite materials. The ceramic fiber-reinforced polyimide electric insulation composite material is prepared by the following steps: (1) polyacrylamide is adopted to modify nano-sericite, so that polyacrylamide-modified nano-sericite is obtained; (2) the polyacrylamide-modified nano-sericite is dispersed into absolute ethyl alcohol, polyimide powder is dispersed into the absolute ethyl alcohol, and thereby mixed dispersion is prepared; (3)the mixed dispersion is agitated at high speed under an ultrasonic field, grinding is then carried out, and after drying under high temperature, a mixed material is obtained; (4) the mixed material and ceramic fibers are mixed, and by die-pressing, the ceramic fiber-reinforced polyimide electric insulation composite material is obtained. According to the ceramic fiber-reinforced polyimide electric insulation composite material provided by the invention, not only can the high temperature resistance and acid and alkali resistance of the material be remarkably improved, but also the elongation of the material is improved.

The invention relates to a thermoplastic polyurethane elastomer for a mining sieve as well as a preparation method thereof, and belongs to the technical field of thermoplastic polyurethane. The thermoplastic polyurethane elastomer for the mining sieve comprises the following raw materials: polyester polyol, diisocyanate, a chain extender, an antioxidant, a light stabilizer, a lubricating agent, awater-proofing agent, an anti-hydrolysis agent and a catalyst, wherein the molecular weight of the polyester polyol is 1000 to 3000 and the functionality degree of the polyester polyol is 2.001 to 2.02. The thermoplastic polyurethane elastomer for the mining sieve has excellent high-temperature dimensional stability, high modulus, low abrasion and hydrolysis resistance, can be formed rapidly and can perform processing by an extruding or injection molding mode; meanwhile, the invention provides a simple and practicable preparation method.

The invention discloses a semi-aromatic nylon composition which comprises the following components in parts by weight: 35-75 parts of semi-aromatic nylon resin, 25-50 parts of reinforced fibers, 0.3-1part of an inorganic nucleating agent, 0.5-1 part of 2,6-naphthalic acid and derivatives thereof, 0-24 parts of a flame retardant and 0-7 parts of a synergistic flame retardant. The semi-aromatic nylon composition disclosed by the invention is high in crystallization temperature and short in molding period; the invention solves the problems that the existing modified semi-aromatic nylon compositematerial is difficult to mold and demold, the size shrinkage of a molded product needs post-treatment and the like. The product has excellent high-temperature creep resistance and comprehensive mechanical properties and can be widely applied to the fields of electronics, automobiles, war industry and the like.

The invention provides a high-temperature-resistant Al-Si-B-O ceramic airgel material, which uses a sol-gel process to uniformly disperse an aluminum precursor, a silicon precursor, and a boron precursor in a solvent, and then undergoes hydrolysis and polycondensation After the reaction, co-gel, and then synthesize a high-temperature-resistant Al-Si-B-O ceramic airgel material through a supercritical drying process. The present invention is passed in Al 2 o 3 The introduction of Si and B elements into the airgel can not only significantly delay Al 2 o 3 The sintering and phase transformation of nanoparticles can also form an aluminoborosilicate glass phase film covering the surface of the aerogel at a high temperature of 1500 ° C, effectively blocking the continuous transfer of heat from the outside of the aerogel to the inside, thereby improving the performance of the aerogel. al 2 o 3、 Al 2 o 3 ‑SiO2 2 The high-temperature thermal stability and high-temperature heat insulation performance of the base airgel can significantly increase the service temperature of the aerogel, and can be used as a high-temperature heat-insulation protective material for aerospace vehicles.

The invention provides an antistatic polysulfonamide / carbon nano-tube composite material and a preparation method thereof. The polysulfonamide / carbon nano-tube composite material is prepared by adopting a solution blending method in a physical blending technology, taking polysulfonamide as a matrix and adding carbon nano-tubes with different mass fractions, and is prepared into composite fibers or composite films. According to the invention, an ultrasonic blending technology is utilized so that a small amount of the carbon nano-tubes can be uniformly dispersed in the polysulfonamide matrix in nano-scale; as nano particles with excellent electric conductivity, the carbon nano-tubes ensure that the prepared antistatic polysulfonamide / carbon nano-tube composite material has good antistatic properties, and the specific surface resistivity of the composite material reaches 104 to 1,011 omega; moreover, the rigidity and excellent high-temperature dimensional stability, heat resistance and the like of the carbon nano-tubes can be perfectly combined with the tenacity and processability of an organic polymer. The preparation method provided by the invention is simple and convenient in process, strong in operability and low in cost.

The invention discloses a fiber reinforced silicate fireproof board produced by doping industrial waste residue. The fiber reinforced silicate fireproof board comprises, by mass, 7-15% of cement, 20-30% of carbide slag, 20-35% of polished tile waste residue, 4-10% of metakaolin, 4-10% of aluminum hydroxide, 4-10% of mica, 3-6% of expanded perlite, 3-6% of expanded vermiculite, 6-8% of wood pulp fiber and 0.6-1.2% of bentonite. The polished tile waste residue is utilized to produce the fiber reinforced silicate fireproof board, so that a new path is provided for using the polished tile waste residue, production cost is low, the process is easy to realize, and the fiber reinforced silicate fireproof board has remarkable substantial effect on utilization of the polished tile waste residue and environment protection. The fiber reinforced silicate fireproof board has low heat conducting coefficient and high high-temperature size stability and can be used for face boards of passive fireproof system of various buildings.

The invention relates to a method for preparing a wound heat-insulating drum. The method comprises the following steps of: 1, cutting a soft felt, pre-dipping and performing air drying; 2, gumming carbon cloth; 3, brushing an adhesive on the soft felt and the carbon cloth; 4, winding; 5, curing; 6, repairing an end face; 7, sealing holes of a coating; 8, performing carbonization treatment; and 9,performing high-temperature treatment and cooling along with a furnace to obtain the wound heat-insulating drum. The method has the advantages of simple process and batch production; and the preparedwound heat-insulating drum has the advantages of difficult layering, good mechanical property, superior high-temperature dimensional stability, low thermal conductivity and low ash content. The method reduces the replacement frequency of the heat-insulating drum and has great significance in prolonging the service life of the heat-insulating drum in high-temperature furnace equipment.

The invention belongs to the technical field of polyurethane foaming plastics, and in particular relates to a foaming material for a split solar heat-insulation board and a preparation method of the foaming material. Polyether polyol I, polyether polyol II, polyether polyol III, a catalyst I, a catalyst II, a catalyst III, silicone oil and a fire retardant are mixed uniformly to obtain the foaming material. Foam generated during the reaction process of the prepared foaming material and isocyanate has high compression strength, therefore the foam generated by the foaming material for the split solar heat-insulation board has high high-temperature size stability, and the foam is prevented from deforming at high temperature. Meanwhile, fire-retardant polyester is adopted to be matched with the fire retardant for use, so that the split solar heat-insulation board is ensured to have B2-grade fire-retardant performance. The method has the advantages of being scientific and reasonable, simplicity and easiness in operation and low production cost.

The invention relates to a thermoplastic composition which can replace thermosetting plastic and cross-linked nylon when used as a contact supporting part for a medium-and-high-grade alternating current contactor. According to the invention, a specific resin matrix is selected and used, and a specific fire retardant is rationally compounded with a reinforcing agent and a wear-resisting agent, so a reinforced flame-retardant wear-resistant synergistic system is formed, and the effect each component is made full use of. Compared with the prior art, the thermoplastic composition provided by the invention has the characteristics of high impact strength, high heat resistance, excellent flame resistance, good wear resistance, good dimensional stability at high temperature, superior arc resistance and good insulating properties, and completely satisfy performance requirements of a contact supporting material.

The invention provides a preparation method of a polyimide / zinc oxide composite lithium ion battery diaphragm. According to the method,Zn < 2 + > metal ions are introduced onto polyamide acid (PAA) fibers by adopting an ion exchange method, and subsequent heat treatment is performed to simultaneously realize the imidization of the PAA and the formation of ZnO nanoparticles. The method comprises the following steps of: synthesizing PAA by taking diamine and dianhydride as monomers, and carrying out electrostatic spinning by taking the PAA as a spinning solution to obtain a PAA nanofiber membrane; then preparing a zinc salt solution with a certain concentration, immersing the PAA nanofiber membrane into the zinc salt solution for a period of time for ion exchange, and performing cleaning; and finally, carrying out thermal imidization to obtain a polyimide / zinc oxide composite nanofiber membrane. The method is simple and low in cost; the surface of the polyimide nanofiber membrane is coaxially coated with zinc oxide, so that the wettability of a diaphragm electrolyte is improved, and the flame retardance of the diaphragm electrolyte is effectively improved; and the method has a wide application prospect in the field of novel lithium ion battery diaphragms.

The invention belongs to the field of polymeric membrane materials, and particularly relates to a polyarylsulfone amido porous membrane, and a preparation method and an application thereof. The porous membrane is provided with a porous eyed structure, the hole diameter range is 50 nm-5 mum, and the porosity is 50-90%. The invention further discloses the preparation method of the porous membrane. The polyarylsulfone amido porous membrane is prepared from a solution containing polyarylsulfone amide, an additive, a pore-foaming agent and a solvent with a phase inversion method. The preparation technology is good in controllability; the preparation method is simple; the production cost is low; the obtained porous membrane is adjustable in hole diameter, good in penetrability and higher in membrane air permeability; the dimension shrinkage rate at 200 DEG C is less than 1%; the thermal stability is excellent; and the flame resistance is good. The porous membrane can be used in the fields of high-temperature filter materials, adsorbing materials, air-permeability packaging materials, parting materials, lithium ion battery diaphragms and the like.

The invention discloses a nickel-chromium high-resistance electrothermal alloy, which belongs to the field of metallurgy. The chemical composition of the nickel-chromium high-resistance electric heating alloy is: C≤0.08%, Si0.75-1.60%, Al≤0.50%, Cr20.0-23.0%, Mn0.05-0.10%, Fe≤ 1.0%, P≤0.020%, S≤0.015%, Ti0.10-0.30%, Co0.20-0.45%, Zr0.05-0.18%, the balance is Ni and unavoidable impurities; the nickel-chromium high-resistance electric heater of the present invention Alloy, its coefficient of linear expansion a×10 ‑6 / °C (20‑1000°C): 17.25‑17.43, resistivity 1.12‑1.15uΩ.m, elongation ≥ 25%, which can effectively solve the poor physical properties of the existing Cr20Ni80 resistance electrothermal alloy, and improve the Cr20Ni80 resistance electrothermal alloy with existing technology Problems with higher physical performance costs.