182results about How to "Improve thermal stability" patented technology

Composite particles containing metallic shell layers are provided. The particles may include a coating layer, such as of a protective or electrically non-conducting material, over an outermost metallic shell layer. The particle preferably has a plasmon resonance associated with at least one metallic shell layer. The coating layer preferably imparts improved thermal stability to the plasmon resonance. Further, the present invention relates to particles that include at least two metallic shell layers, separated by a coating layer. The addition of a second metallic shell layer preferably allows the plasmon resonance of the shell layer to be more red-shifted with respect to a colloidal particle of the metal that the plasmon resonance of a particle of the same size but with only a single metallic shell.

The present invention is directed to a photoinitiator composition comprising two different cationic photoinitiators and a photocurable composition comprising said photoinitiator composition. Moreover, the present invention relates to the use of the photoinitiator composition and the photocurable composition. Furthermore, the present invention relates to a process for producing a three dimensional article.

The invention provides a lipase mutant with improved heat stability and a construction method thereof. The lipase mutant with improved heat stability is obtained by subjecting Candida Antarctica lipase B gene to several rounds of fixed point saturation mutagenesis, the Candida Antarctica lipase B having an amino acid residue sequence expressed by SEQ ID No:1, and the lipase mutant having amino acid residue sequences expressed by SEQ ID No:2, SEQ ID No:3 or SEQ ID No:4, each of which consists of 317 amino acids. A method of semi-rational design is utilized in the invention, and a lipase mutantis obtained by subjecting Candida Antarctica lipase B gene to several rounds of fixed point saturation mutagenesis, wherein the mutant includes amino acid mutations D223G, L278M and combination of the two. Expressed by T50<15> and half-life t1/2 at the temperature of 48 DEG C respectively, the heat stability of the lipase mutant is improved, and a high actual application value and broad market prospects are also provided.

A magnetic memory cell structure with thermal assistant includes a magnetic pinned layer, a barrier layer, a magnetic free layer, a perpendicular magnetic layer, and a heating layer sequentially stacked. The magnetic free layer has a longitudinal magnetization. The perpendicular magnetic layer has a perpendicular magnetization at a first temperature and is perpendicularly coupling to the longitudinal magnetization of the magnetic free layer. The perpendicular magnetic layer is in a paramagnetic state at a second temperature. The present invention further includes magnetic dynamic random access memory.

The invention discloses a lithium ion battery positive active substance, an anode material, an anode material sizing agent, an anode piece, a preparation method thereof and a lithium ion battery, which relates to the technical field of lithium ion batteries. The lithium ion battery positive active substance is mainly prepared from the following components by weight percent: 10 to 50 percent of lithium manganese ferrous phosphate and 50 to 90 percent of nickel cobalt lithium manganate, wherein the lithium manganese ferrous phosphate is LiMn*Fe1-*PO4, x is greater than 0.5 and less than 1; and the nickel cobalt lithium manganate is Li(Ni*CoyMnz)O2, x is greater than 0 and less than 1, y is greater than 0 and less than 1, and z is greater than 0 and less than 1. The lithium ion battery positive active substance solves the problems of excessively high temperature and safety of the traditional lithium battery at multiplying power. By improving an anode material and an anode piece, not only can the heat stability of the anode material be improved, but also the internal resistance of the pole piece can be reduced, the application to the high power can be satisfied, and the safety is good.

The invention relates to a process for making reinforced diary porcelain by using porcelain clay as the principal raw material of the blank, the process comprises the steps of, charging into pre-treated super fine, talcum powder and porcelain clay oxidizing substance. The invention can be applied in producing high-grade reinforcement diary porcelain with high-intensity and good thermal stability containing nano Mullite-cordierite and corundum crystal particles.

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention discloses an aluminium alloy section bar for structural engineering, and a preparation method thereof. The aluminium alloy section bar comprises the following compositions by weight percent: 0.50-0.60% of magnesium, 0.65-0.75% of silicon, 0-0.25% of manganese, 0-0.10% of chromium, 0.005-0.009% of titanium, 0-0.30% of iron, 0-0.10% of zinc, 0-0.10% of copper, and the balance aluminium. Compared with 6063 alloy and 6063A alloy, the aluminium alloy section bar of the invention has tensile strength of 290 MPa or more, yield strength of 240 MPa or more, and elongation at break of 8% or more. 6061 alloy is high in quench sensitivity, and quenching and water cooling must be employed for guarantee of obtaining demanded mechanical properties during production, and therefore the extruded aluminium section bar is serious in deformation; compared with 6061 alloy, the alloy material of the invention is smaller in quench sensitivity, and by using strong wind cooling or mist cooling, the demanded properties are obtained when the section bar is processed; and the aluminium alloy section bar of the invention is good in toughness, and has a pendulum impact value of 20 J/cm<2> or more.

A phase change material layer includes germanium (Ge), antimony (Sb), tellurium (Te) and at least one impurity elements. An atomic concentration of impurity elements ranges from about 0<a≦about 0.25 and an atomic concentration of antimony (Sb) ranges from about 0.03<c≦about 0.15.

The invention discloses a Newcastle disease virus heat-resistant transformation method and application of the Newcastle disease virus heat-resistant transformation method. The heat-resistant characteristic of the Newcastle disease virus is specifically and remarkably improved through an HN gene replacement method. The non-heat-resistant Newcastle disease virus is transformed at the transcription plasmid level through the RNA virus reverse genetic technology, the HN gene of the non-heat-resistant Newcastle disease virus is replaced with the HN gene of the heat-resistant Newcastle disease virus, host cells are transfected by the transformed transcription plasmid, rescue is conducted to obtain the heat-resistant transformed Newcastle disease virus, and therefore the heat-resistant characteristic of the Newcastle disease virus is greatly improved. The heat-resistant characteristic of the Newcastle disease virus is remarkably improved through the artificial recombination mode for the first time, and a non-heat-resistant Newcastle disease vaccine strain LaSota is successfully transformed into a heat-resistant Newcastle disease vaccine strain rT-HN. The method can be widely applied to heat-resistant transformation of Newcastle disease vaccine strains, and has great application prospects on the aspects of heat-resistant, safe and efficient Newcastle disease vaccine research and the like.

A nanogranular thin film consisting of nonmagnetic matrix and ferromagnetic fine particles in nano scale is improved to enhance the thermal stability and the S/N ratio. The ferromagnetic fine particles consist of (FeaCo1-a)1-xPtx, (0.3<=x<=0.7, 0.1<=x<=1), (FeaCo1-a)1-xPdx, (0.3<=x<=0.7, 0.1<=x<=1) or (FeaCo1-a)1-x(PtbPd1-b)x, (0.3<=x<=0.7, 0.1<=x<=1, and 0<b<1).

The invention discloses a method for preparing siderite under high temperature and high pressure. The method comprises the following steps: 1, using analytically pure ferrous oxalate dihydrate as a starting material; 2, pressing the ferrous oxalate dihydrate powder into a cylinder by using a tablet pressing machine, and wrapping the cylinder into a sample by using silver foil; 3, grinding chloride sodium into powder which is more than 200 meshes, placing in an oven and drying for 2 hours at the temperature of 150 DEG C; 4, preparing a sodium chloride cylinder sample which contains a ferrous oxalate dihydrate cylinder in the step 2 by using the dried chloride sodium powder; 5, assembling the sample in a high-pressure synthesis and assembly block and placing in a six-side top large press to carry out a high-temperature and high-pressure reaction; 6, taking out the reacted sample, and removing the silver foil on the surface of the sample, thus obtaining the pure siderite. By adopting the method disclosed by the invention, the problems of long reaction time, complex reaction, poor crystallization degree of the prepared siderite and the like because the siderite is prepared by using a hydrothermal method in the prior art are solved.

The invention discloses a PVC (polyvinyl chloride) plastic floor. The PVC plastic floor is formed by a double-layer structure, wherein a surface layer is formed by auxiliary materials; a bottom layer is formed by main materials. The PVC plastic floor has the beneficial effects that as silicon nitride nanopowder is added to the materials of the floor, the wear resistance and strength of the floor are greatly enhanced, the heat stability is high, the oxidation resistance is strong, the floor is not easy to deform or crack, and the fire resistance of the floor is also enhanced; the floor has better infrared health care functions, clear and natural patterns, elegant appearance and natural marble grains and is elastic, so that people feel very comfortable when walking on the floor; the floor can be widely applied to the places, such as hospitals, schools, office buildings, shopping malls, traffics, industrial places, homes and gyms, is not suitable for using adhesives, is formaldehyde-free, avoids fungi, does not contain heavy metals and can be recycled.

The invention provides a rubber material formulation for a high fatigue resistant rubber diaphragm of an automobile brake chamber, which is mainly prepared by natural rubber (NR), styrene butadiene rubber (SBR), polybutylene terephthalate (PBT), vulcanizing agent, zinc oxides, stearic acid, anti-aging agent, dispersant, accelerant, carbon black, aromatic oil and white carbon black. The physical mechanical properties of the rubber diaphragm of the automobile brake chamber prepared by the rubber formulation all reach the novel standard drafted by the Society of Automotive Engineering (SAE) of America; the service life of a platform of the rubber diaphragm reaches over 2 million times; the platform has the advantages of high stress at definite elongation, strength and elongation property, compression fatigue resistivity, flexural deformation resistance and attrition resistance, and maintenance of small variation of the material characteristics within the wide use temperature between 55 and 100 DEG C when the material is used; and the service life of the platform is basically the same as that of an air brake assembly, and resource conservation is greatly promoted simultaneously, thereby realizing conversion of the platform from 'a wearing part' to 'a permanent part'.

The invention provides a lithium battery cathode material and a preparation method thereof. The preparation method comprises the following steps: S1, performing coprecipitation reaction on a solution A and an alkali solution for 5-25 h; S2, pumping a solution B into the solution A at a constant speed, continuing to perform coprecipitation reaction on the whole mixed solution and the alkali solution when the solution B is pumped, and drying the obtained precursor after the reaction is terminated; and S3, mixing the precursor with a lithium salt, and sintering to obtain the lithium battery cathode material. The molar ratio of Ni, Co and Mn in the solution A is equal to (1-2x):x:x, and 0<x<=0.25, and the molar ratio of Ni, Co and Mn in the solution B is equal to (1-2y):y:y, and 0.25<=y<0.5. The provided lithium battery cathode material has the advantages of high capacity, high heat stability, high cycle performance, high electrochemical performance and low cost.

The invention relates to a preparation method of an organic and inorganic hybrid with a core-shell structure. The reaction formula of a process line is represented by the following formula (I) in which APP is ammonia polyphosphate, bPEI is branched polymine, and BPE is self-made biomass polyphosphoester electrolyte; an organic and inorganic hybrid flame retardant with 1 to 6 layers is prepared by a layer-by-layer self-assembling method; every two layers are connected via electrostatic or hydrogen bond action. Due to the molecularly structural design, a relative good flame retardant effect can be achieved when the adding amount of the prepared biomass organic and inorganic hybrid in polylactic acid (PLA) is less than 15 weight percent, and the adding amount is far lower than that of the conventional phosphorus based flame retardant. The organic and inorganic hybrid is an efficient and environment-friendly flame retardant: FORMULA.

The invention discloses an ultrahigh-temperature safe lithium ion battery electrolytic solution and a lithium ion battery using the electrolytic solution. The electrolytic solution comprises 10-15% ofa lithium salt, 1-5% of a high-temperature film-forming additive, 1-10% of a flame-retardant additive and the balance of an organic solvent, wherein the lithium salt is one or a mixture of more thantwo of hexafluorophosphoric acid, lithium bis (fluorosulfonyl) imide or lithium bis (trifluoromethylsulfonyl) imide, the organic solvent is formed by mixing carbonic ester, carboxylic ester and a fluoroether solvent according to a certain proportion, the carbonic ester accounts for 30%-70% of the total amount of the lithium ion battery electrolytic solution, the carboxylic ester accounts for 0%-10% of the total amount of the lithium ion battery electrolytic solution, and the fluoroether accounts for 0%-10% of the total amount of the lithium ion battery electrolytic solution. According to the invention, the electrolytic solution disclosed by the invention is a high-temperature solvent and lithium salt with excellent thermal stability, and a film-forming additive with excellent film-formingthermal stability and a proper flame-retardant additive are added to realize the flame-retardant effect of the electrolytic solution; and the lithium ion battery disclosed by the invention can be normally used under the ultrahigh temperature condition of 100 DEG C while the battery has excellent safety performance.

The invention relates to raw materials for preparing PE (polyethylene) structure wall pipe and a preparation method of the PE structure wall pipe. The raw materials comprise superfine talcum powder, white carbon black, barium sulfate, calcium carbonate whisker, HDPE (high density polyethylene), EPDM (ethylene-propylene-diene monomer), polypropylene, a composite coupling agent, polyethylene wax, zinc stearate and color black. The preparation method comprises the following steps: a, blending the components according to mass part, feeding into a high-speed mixer to mix; b, drying mixed material by using hot wind; c, cooling dried material to room temperature; d, feeding the cooled material into a double-screw extruder, carrying out plasticization extrusion, carrying out water cooling, and chopping into particles with a fixed length after cooling and shaping; and e, feeding the particles into a vibrating screen to screen, packaging the qualified particles. The PE structure wall pipe prepared by utilizing the raw materials and the preparation method is good in heat stability and mechanical property, the process flow of the corrugated pipe production is simplified, and the production cost is lowered.

The invention discloses a water-resistant flame-retardant polyurethane adhesive. The polyurethane adhesive contains the following raw materials in parts by weight: 30-50 parts of polyester polyol, 10-35 parts of fluorine-containing polyether diol, 5-28 parts of diferrocenyl alcohol, 40-60 parts of diphenylmethane-4,4'-diisocyanate, 2-10 parts of 3,3'-dichloro-4,4'-diaminodiphenyl methane, 0.2-0.8 part of a catalyst, 3-15 parts of a chain extender, 2-8 parts of melamine, 1-5 parts of chitosan, 3-15 parts of calcium alginate fibers, 1-5 parts of polyimide, 1-5 parts of amino silicon oil, 2-8 parts of epoxy resin, 2-10 parts of aldehyde ketone resin, 2-10 parts of attapulgite and 100-150 parts of a solvent. The water-resistant flame-retardant polyurethane adhesive provided by the invention has excellent water resistance and flame retardance, is high in curing speed and has high bonding strength with a substrate.

The invention relates to a preparation method of amino polyphosphazene microspheres, which belongs to the technical field of polymer materials. The preparation method comprises the steps of dispersing one part of hexachlorotriphosphazene and 0.5-2.5 parts of 4,4'-diaminodiphenyl ether in 195-390 parts of acetonitrile solution, adding 4.5-9 parts of acid binding agent in an organic solvent, then carrying out ultrasonic reaction for 8-10 hours at the temperature of 40-60 DEG C, preparing amino polyphosphazene suspension, filtering the amino polyphosphazene suspension after the ultrasonic reaction, carrying out repeated washing treatment, and finally drying for 7-8 hours through a vacuum baking oven, thereby preparing the amino polyphosphazene microspheres. The microspheres obtained by the preparation method have higher reductibility due to containing a large amount of aromatic ammonia, and can directly generate oxidation and reduction with chloroauric acid solution and load gold nanoparticles in situ. Meanwhile, the steps are simple, the preparation method does not need to add any stabilizer or surfactant, the post-treatment is further simple, and a byproduct of triethylamine salt is very easy to dissolve in water.

The invention discloses an acousto-optic modulating cavity dumping CO2 laser device and belongs to the technical field of lasers. The acousto-optic modulating cavity dumping CO2 laser device aims at solving the problem that an existing acousto-optic Q-Switched laser is large in pulse width and the acousto-optic Q switching cannot achieve effective turn-off of the laser on the condition of higher laser gain. The laser device is coaxially provided with a concave total reflector, a laser pipe, an acousto-optic modulator and a plane total reflector in sequence from left to right. A signal generator is connected with the acousto-optic modulator, the concave total reflector and the plane total reflector form a laser oscillation cavity, the laser pipe is used for generating laser grain, the acousto-optic modulator is inserted into the cavity, the signal generator is used for accurately controlling an oscillation laser beam of the acousto-optic modulator to oscillate back and forth in the cavity, the laser beam is diffracted out of the cavity by the acousto-optic modulator, and laser output is formed. The laser repetition frequency is determined by signals input by the signal generator, and the pulse width is determined by the time spent by the oscillation laser for oscillating back and forth in the cavity. In the laser device, the plane total reflector in the resonant cavity is replaced by a plane reflecting optical grating. According to the laser device, the resonant cavity is replaced by a three-mirror folded cavity.

The invention relates to a method for preparing a polyether amide material, which comprises the following process steps of (1) dripping ethanol solution of polyetheramine to ethanol solution of diacid to obtain ethanol solution of polyetheramine and diacid, removing ethanol with a rotary evaporator, and drying to obtain polyetheramine-diacid salt; (2) mixing the polyetheramine-diacid salt with water to obtain salt solution, and carrying out prepolymerization on the salt solution under the conditions of stirring and nitrogen gas protection to obtain prepolymer; and (3) continuing raising the temperature to carry out heating dewatering and polycondensing on the prepolymer obtained in the step (2), introducing nitrogen gas to bubble and remove residual moisture in the prepolymer during the heating dewatering and polycondensing process, and discharging moisture by a moisture separator to obtain the polyether amide material. According to the invention, an improved process method of salification/pre-polycondensing/polycondensing is adopted, so that the polyether amide material with high molecular weight, low dispersion degree, high heat stability, high toughness and excellent hygroscopicity is prepared.

The present invention provides a positive electrode material LiNi1-xCoxO2 (x is greater than or equal to 0.15 or less than or equal to 0.30) covered by using LiCoO2 and its preparation method. Said material has good electric discharge multiplying factor specific property, charging and discharging circulating performance, safety and storage property.

The invention relates to an organic electroluminescent material Zn (n-RBTZ) 2 based on benzothiazolyl, which has the structure general formula shown in formula (I) and is prepared by leading ligand material which is the product obtained by the reaction between salicylic acid ramification and ortho-amino thiophenol to react with zinc acetate. The Zn (n-RBTZ) 2 prepared by the invention has higher thermal stability, and fluorescence quantum efficiency of the Zn (n-RBTZ) 2 is higher than that of Zn (BTZ) 2, so that the electron transport performance of the material is improved, the phenomenon of unbalanced carrier transport in a cavity layer and a luminous layer in an organic electroluminescent device is overcome, and the stability of the device is improved. The Zn (n-RBTZ) 2 is blue light emitting material with good performance, which has broad band luminescent spectrum and can be expected to be compounded with other colors such as red to realize white light emission. In the formula, R represents C1-C3 alkyl, C1-C3 alkoxy, or C1-C3 alkyl or halogen atom substituted by one or more halogen atom (s).

The invention provides a rare earth vanadate SCR denitration catalyst, which includes LaVO4 as an active component, WO3 and Al2O3 as additives and TiO2 as a carrier. The LaVO4 is used as the active component, wherein La can inhibit sintering and crystal form transformation of the carrier, TiO2, at high temperature, thereby improving thermostability of the catalyst. Vanadium exists in the form of vanadate, so that required active sites for an SCR reaction are supplied, and sintering and volatilization of the vanadium at high temperature are prevented, thereby reducing environment pollution. In conclusion, the catalyst has excellent high temperature activity and thermostability, and can be used for controlling emission of NOx in high-temperature flue gas from gas turbine engines and the like.

The invention relates to a preparation method of a high activity Pd/C catalyst, and the preparation method is mainly used for solving the problems of poor Pd dispersion in the catalyst, low microcrystal content and poor thermal stability of the prior art. The preparation method adopts activated carbon as a carrier and impregnates or sprays solution containing Pd on the activated carbon for preparing a precursor of the Pd/C catalyst, the precursor of the catalyst is carried out the step-by-step reduction treatment by using a reducing agent after the aging treatment, reduction fluid with the high concentration of 3 to 30 percent by weight is firstly used for carrying out the reduction for 0.1 to 24 hours at the normal temperature, then the reduction fluid with the low concentration of 0.1 to 2 percent by weight is then used for carrying out the reduction for 0.5 to 24 hours at 50 to 120 DEG C, and the Pd/C catalyst is obtained by water washing; therefore, the technical proposal can better solve the problems and can be used in the industrial production of para-toluic acid catalyst by using 4-carboxy benzaldehyde.

The present invention belongs to the field of organic semiconductor materials and devices, and relates to novel dibenzosuberan enone derivatives and a preparation method therefor and an application thereof. The general structural formula of the dibenzosuberan enone derivatives is as shown in the specification. According to the method, dibenzosuberan enone is used as a skeleton structure, and a substituent with a hole transport property substitutes hydrogen in the skeleton structure through coupling reaction to prepare the dibenzosuberan enone derivatives; the prepared dibenzosuberan enone derivatives are used as an organic semiconductor layer to prepare a blue and green light emitting organic electroluminescent device. In the preparation method, the substituent with the hole transport property can improve thermal stability of the material and performance of the electroluminescent device, and the blue and green light emitting organic electroluminescence device is obtained by using the material as the light emitting layer.

The invention relates to a solid solution carrier catalyst and particularly relates to a multi-doped cerium-zirconium carrier catalyst. The chemical components of the catalyst in parts by weight are as follows: 30-40 parts of cerium oxide, 30-40 part of zirconia, 1-20 parts of other rare earth oxides and 1-5 parts of transition metal oxides, wherein the other rare earth oxides are lanthanum oxide, praseodymium oxide, neodymium oxide, yttrium oxide and samarium oxide and the transition metal oxides are vanadium oxide, chromium oxide, manganese oxide, ferric oxide, cobaltosic oxide and copper oxide. The invention further provides a preparation method of the catalyst. The preparation method comprises the following steps: mixing all the raw materials with a surfactant, adjusting the pH to 8-10 to obtain a gel-like deposition and calcining to obtain the product. According to the method, the doping defect caused during cerium-zirconium carrier doping is overcome; meanwhile, the thermal stability, aging specific area and oxygen storage amount of the carrier catalyst are improved; the invention also provides the preparation method which is simple in technique process and is favorable for large-scale industrial production.

An aluminum melting furnace cast refractory material is prepared through using the following raw materials, by weight, 50-60 parts of bauxite, 30-35 parts of 1-50mum brown fused alumina, 15-20 parts of a silicon-based floating bead, 10-15 parts of alumina, 20-25 parts of white mud, 20-25 parts of quartz sand, 10-15 parts of mullite, 10-15 parts of 30-80mum silicon carbide, 5-10 parts of sodium tripolyphosphate, 15-20 parts of andalusite, 1-2 parts of zirconia, 2-3 parts of titanium oxide, 15-20 parts of potash feldspar and 10-15 parts of vermiculite. In the invention, bauxite is used as a primary material, the particle sizes of the raw materials are preset, and parts of the raw materials are molten, and then are cooled and crushed, so the combination force among the raw materials is enhanced, the thermo stability of the refractory cast material is improved, the thermal shock resistance stability of the cast material is good, a reaction of the cast material and the aluminum element is difficult, the penetration of molten aluminum is effectively prevented, and the service life of a furnace is prolonged. The aluminum melting furnace can be used for 2-3 years, and the washing of the inner wall of the furnace is less.

High melting point coating wax and a preparation method thereof are disclosed, belonging to packing material technical filed. The invention takes high grade microcrystal wax as material to prepare high melting point coating wax which is at melting point of 110DEG C and satisfies national food wax standard GB7189-94 through the steps of adding Tissuemat E, high melting point foodstuff paraffin and antioxidant, heating and mixing, filtering and molding. The high melting point coating wax has the advantages of high melting point, good flexibility and good sealing, and is safe to eat and use. The high melting point coating wax can be applied to food packing paper and packing containers which are filled or sealed under high temperature or food packing paper and packing containers which are folding resistant, oil resistant and water vapour penetration resistant, as well as the coating of other wrappages.