33 results about "Thermal stability" patented technology

In a laser module (310), single-emitter laser diode chips (110) are positioned at different heights on opposite sides of the module's combined output beam (114). Each laser diode chip (110), and its corresponding fast and slow axis collimators (130, 134), and turning mirror (140) are positioned on a corresponding heat-dissipating surface region (340). High thermal stability and output power are obtained in some embodiments even if the modules are combined to obtain higher-level modules (310-2). Other features and embodiments are also provided.

The invention discloses a phosphor-silicon-containing aggregated flame retardant and a preparation method thereof. The preparation method comprises the following steps: adding 10-(2,5-dihydroxy phenyl)-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and an acid-binding agent into a reactor loaded with a burette, a condensing tube and a nitrogen protection device, heating to 40 to 100 DEG C; weighing R1, R2-dichlorosilane, adding a solvent, and adding the mixture into the burette; adding the mixture at the temperature of 40 to 100 DEG C dropwise, and performing a thermal reaction for 2 to 10 hours after finishing of dropping; adding a precipitant, performing suction filtration, washing filter cakes with the precipitant, and drying to obtain the phosphor-silicon-containing aggregated flame retardant. The phosphor-silicon-containing aggregated flame retardant has high phosphor content and silicon content, abundant carbon sources, high char forming characteristic, superior flame retardance and thermal stability, and can be applied to high-molecular materials such as flame-retardant polypropylene, polystyrene and epoxy resin.

The invention discloses a halogen-free flame retardant and a preparation method thereof and a flame-retardant polyolefin composition composed of the same. The structural formula of the halogen-free flame retardant is shown in the description, wherein the ratio of x to y to z is 1:(5-10):(1-5). The preparation method comprises the steps that melamine, phosphoric acid and piperazine are weighed and put into a high-speed mixer of which the top is provided with a liquid spray device to be stirred and mixed to be uniform, and a halogen-free flame retardant premixed material is obtained; the halogen-free flame retardant premixed material is subjected to a high-temperature dehydration condensation reaction, and the polyphosphoric acid-melamine-piperazine composite salt halogen-free flame retardant is obtained. The halogen-free flame retardant with the composite salt structure has the advantages that the halogen-free flame retardant is good in heat stability, high in phosphorus content and free of impurities such as halogens and inorganic salts, and the index of whiteness is larger than 90; few synthesizing process steps are needed, operation is simple and easy to carry out, the requirement on equipment is low, and the product yield reaches up to 80% or above; the flame-retardant polyolefin composition containing the halogen-free flame retardant has the good flame-retardant property, high water-resistant and heat-resistant properties and the excellent pigmenting property.

The invention relates to a high-temperature iron-based zeolite molecular sieve honeycomb type denitration catalyst and a preparation method thereof, and belongs to the technical field of atmospheric pollution treatment technologies and environmentally friendly catalyzing materials. The preparation method comprises the following steps: mixing ferrous salts with ferrite; synthesizing a zeolite molecular sieve, natural zeolite molecular sieve powder, attapulgite clay or kaolin, glass fibers, an organic binding agent, wood pulp or sesbania cannabina powder, stearic acid and glycerinum; and carrying out mixing, ageing, extrusion forming, drying and roasting to obtain the iron-based zeolite molecular sieve honeycomb type denitration catalyst. According to the catalyst, the zeolite molecular sieve and natural raw mineral materials which have excellent thermal stability are used as carriers, and the running stability, the sintering resistance and the mechanical strength of the catalyst in a high-temperature environment are improved. The obtained honeycomb type denitration catalyst has good water resistance and sulfur poisoning resistance, and the conversion ratio of oxynitride is greater than 90% under the conditions that the temperature is in the high-temperature range of 400-600 DEG C and the air speed is 10,000 h<-1>.

The invention discloses an ultraviolet light-cured acrylate-layered double hydroxide nano composite material and a preparation method thereof; the preparation method is characterized in that a long-chain anionic surfactant is used for modifying inorganic layered double hydroxide by anion exchange; next, an acrylate modifier with isocyanate groups is used for modifying the surface hydroxyls of the layered double hydroxide, a large amount of high-reactivity acrylate groups are grafted; and finally, the layered double hydroxide used with modified surface is mixed with acrylate monomers, acrylate oligomer and an ultraviolet light initiating agent to obtain the ultraviolet light-cured acrylate-layered double hydroxide nano composite material. The preparation method has simple and easy operation, realizes high-degree delamination and good dispersion of the layered double hydroxide in a polymeric matrix. Compared with the pure acrylate material, the ultraviolet light-cured acrylate-layered double hydroxide nano composite material has high strength, high hardness and good thermal stability after being cured by the ultraviolet light, thus having wide industrial application prospect.

A basic metal nitrate suitable as an oxidizing agent for a gas generating agent, which is a basic metal nitrate having a good thermal stability and meeting at least one requirement of the following (a) to (d): (a) a particle diameter of 0.5 to 40 μm; (b) a degree of crystallinity having 0.4 deg or less of a half band width of the peak in the X-ray analysis; (c) an initiation temperature of weight loss being 220° C. or higher according to TG-DTA analysis; and (d) an impurity content of 1,000 ppm or less based on Na atom. Also, a gas generating composition which has a low toxicity, a high burning rate, and a low combustion temperature and which is used in a gas generator for an air bag. The gas generating composition comprises (a) tetrazole derivatives, guanidine derivatives or a mixture thereof, (b) a basic metal nitrate, and (c) a binder and/or a slag-forming agent.

The invention discloses a novel high-chromium ferritic heat resistant steel, composed of the following components by mass percent: 0.08-0.1% of C, less than or equal to 0.5% of Si, 0.3-0.6% of Mn, 8.5-9.0% of Cr, 0.3-0.6% of Mo, 1.5-2.0% of W, 0.20-0.25% of V, 0.02% of Cu, 0.07-0.09% of Nb, less than 0.005% of Ti, 0.004-0.005% of B and less than 0.005% of N, and the balance of Fe and impurities. The thermo-mechanical treatment process of the steel comprises the following steps of: heating at the rate of 5 DEG C/s until the temperature reaches 1100-1200 DEG C and preserving heat for 5-10 min; and then cooling at the rate of 5 DEG C/s until the temperature reaches 900-700 DEG C, preserving heat for 5-10 s, performing compressive deformation at the deformation rate of 1/s by the deformation quantity of 50-70%; preserving heat for 0-100 s after the completion of deformation, and then performing air cooling until the temperature reaches the room temperature. The thermal treatment process provided by the invention is capable of promoting the precipitation of the MX phase having excellent stability, thereby improving the high temperature performance of the steel. Compared with the traditional thermal treatment process, the thermo-mechanical treatment process is simplified in process flow so that the production cost is reduced and the overall performance is improved; and therefore, the thermo-mechanical treatment process can be applied to actual production.

The invention discloses a polymethyl methacrylate-zinc hydroxide nanocomposite and a preparation method thereof. The nanocomposite is powder of which the grain size is 5-40mum. The nanocomposite is formed by connecting zinc hydroxide nanosheets and polymethyl methacrylate in mass percent of (1-40):(60-99) by Zn-O chemical bonds. The zinc hydroxide nanosheets are 5-50mum long, 5-50mum wide and 50-500nm thick, and the polymethyl methacrylate is 50-500nm in grain size. The preparation method comprises the following steps of mixing soluble ammonium salt, soluble zinc salt and water firstly and evenly stirring to obtain mixed solution, adding the polymethyl methacrylate to the mixed solution and stirring to obtain complex solution, subsequently, adding an emulsifying agent to the complex solution and severely stirring to obtain emulsion, then, adding an initiating agent to the emulsion to obtain composite emulsion, and then, putting the composite emulsion in vacuum for drying to obtain a target product. The polymethyl methacrylate-zinc hydroxide nanocomposite is excellent in heat stability, and can be widely used in the field of aviation, automobiles, electronic instruments, consumer goods and the like.

The invention relates to novel magnesium oxysulfate cement-based fireproof coating. The fireproof coating is hysteretic in foaming after coating. The surface drying time of the fireproof coating is 80-360 minutes, the fire-resistant time of the fireproof coating is 120-160 minutes, the softening coefficient of the fireproof coating is 0.8-0.9, and the heat conductivity coefficient of the fireproofcoating is 0.08-0.20W/m<2>*K. The fireproof coating comprises, by weight, 30-60 parts of low-grade light calcined magnesium oxide powder, 10-30 parts of light aggregate, 15-30 parts of magnesium sulfate heptahydrate powder, 0.1-1 part of waterproof agent, 0.1-1 part of fiber, 0.1-10 parts of early strength agent, 1-5 parts of active metal foaming agent and the balance water. The novel magnesium oxysulfate cement-based fireproof coating has the advantages that the fireproof coating is low in heat conductivity coefficient, good in thermal stability, capable of preventing foam generated by physical and chemical foaming from breaking during spraying by using the hysteretic foaming technology and uniform in quality; the fireproof coating is good in corrosion resistance, high in safety performance, stable in quality, good in water resistance and high temperature resistance, good in ultraviolet resistance, long in service life and capable of satisfying safety fireproof requirements.

The invention relates to a fluorocarbon surfactant and a preparation method thereof, which reacts 10-50 parts by weight of perfluoroalkyl sulfonyl fluoride, 5-45 parts by weight of amine and 20-25 parts by weight of solvent at the temperature of ranging from 20 DEG C to 110 DEG C for 2 through 12 hours to acquire an intermediate product; mixing well the intermediate product with 10-30 parts by weight of an oxidant and stirring the mixture for reaction at the temperature of ranging from 20 DEG C to 80 DEG C for a plurality of hours; adding 0.1-2.5 parts by weight of an accessory ingredient and mixing well after the reaction is finished; in this way, the product is acquired when the filtrated product is stirred and mixed with 5-30 parts by weight of a de-ionized water at the temperature of ranging from 0 DEG C to 50 DEG C. Compared with the prior art, the product prepared by the invention is of short technical process of preparation, simple operation, high reaction efficiency, low production cost and is characterized by high surface activity, high thermal stability and high chemical stability. The surface tension of a water solution of 0.01 percent is lower than 16dyn/m, and the CMC value is lower.

The invention discloses a dispersion strengthening copper base composite material for a high-strength and high-conductivity spot-welding electrode and a preparation method thereof, and belongs to the technical field of metal base composite material. The dispersion strengthening copper base composite material comprises the following components in percentage by mass: 5-10% of TiC, 1-5% of In2O3, 0.1-1% of Al2O3, and the balance of Cu, wherein the TiC has the characteristics of high hardness, high melting point and good thermal stability, and can improve the copper strength, wear resistance and high-temperature resistance; and In2O3 has smaller electrical resistivity and higher catalytic activity. The spot-welding electrode prepared by adopting the composite material has such characteristics as high strength, high electrical conductivity, high wear resistance, high softening temperature resistance and high arc ablation resistance; the electrical conductivity is above 80% IACS; the density is higher than 98%; the service life is prolonged by 9-10 times compared with a conventional copper alloy spot-welding electrode; and the softening temperature reaches above 690 DEG C.

The invention provides a preparation method of organic tin-free vinyl chloride-isobutyl vinyl ether copolymer resin (chlorine ether resin for short). The preparation method comprises the steps of adding the materials including deionized water, an emulsifying agent, a buffer agent and the like into polymerizing kettle, heating to a specified temperature, adding an emulsified mixture of the materials including vinyl chloride, isobutyl vinyl ether, deionized water, an emulsifying agent, a buffer agent, stabilizers and the like and materials including an initiator and the like in a batch or continuous manner to generate polymerization, and adding the stabilizers in the later period of the reaction, so as to obtain the organic tin-free chlorine ether resin, wherein the stabilizers are substances containing non-organic tin stabilizers with epoxy groups. The prepared organic tin-free chlorine ether resin has good thermal stability and can be applied to the fields of ink, coatings and the like of tools, foods and medical products. The preparation method has the advantages that the chlorine ether resin does not contain organic tin and has good thermal stability.

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 the Pd/C, wherein, two additives of A and B are added in the solution containing Pd, the additive A is selected from compounds with the above formula, R1 or R2 is selected from one of H, CH3, NH2, OH or COOH, n or m is selected from integrals of 0 to 5; the additive B is selected from compounds with the following formula: CH3(CH2)xO(CH2CH2O)yPO(OM)2(CH3(CH2)xO(CH2CH2O)y)2PO(OM), wherein, y is selected from the integrals of 1 to 5; x is selected from the integrals of 7 to 15; M is selected from Na or K; 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 utility model discloses a heat-resistant vinyl aromatic monomer copolymer compounding method. The method used amine in the axe-type reaction device as the amine imide agent and enables the vinyl aromatic monomer - maleic anhydride unit opening ring of the maleic anhydride copolymer to become the maleic acid amide unit in the organic solution system; and then the vinyl aromatic monomer is arranged in the axe-type reaction device or in a exhaust twin-screw extruding device for reaction. Then the vinyl aromatic monomer is gotten rid of organic solution and is dried to generate heat-resistant vinyl aromatic monomer copolymer. The heat-resistant vinyl aromatic monomer copolymer generated in the method is of good anti heat resistance, thermal stability, processing mobility as well as compatibility with polar material.

The invention relates to a preparation method of polyvinylidene fluoride. An emulsifier and a dispersing agent are replaced by increasing the stirring speed. The preparation method disclosed by the invention comprises the following steps: adding a fluorine-containing organic solvent, a vinylidene fluoride monomer, an initiator and a chain transfer agent into a reaction kettle containing paraffin and water, stirring, increasing the temperature to 55-110 DEG C, reacting for 3-8 h, stopping reaction, washing, filtering, and drying to obtain high-purity polyvinylidene fluoride resin. The preparation method disclosed by the invention is simple in post-treatment process; the prepared powdery polyvinylidene fluoride resin has higher purity and better heat stability, physical and mechanical properties and is convenient to control; and thus, the preparation method of the polyvinylidene fluoride resin disclosed by the invention is applied to industrialization production.

The invention discloses heat-resisting and high-breathability composite modified water glass sand used for a pump valve casting. A modified water glass bonding agent in the water glass sand has superior constant-temperature and constant-humidity strength compared with a conventional water glass bonding agent, thixotropy and the rheological property are better, reaction bonding activity is high, environment friendliness is achieved, a good bonding effect can be achieved with few bonding agents, the use amount of water glass is reduced, and scattering cleaning is easier. Added microcrystal ceramic powder has the effects of strengthening, toughening and the like, and smoothness and strength of the surface of molding sand are improved; breathability of the molding sand can be improved through superfine polyving akohol micro powder, and even and micro air holes are formed; molten metal is not likely to permeate; and nanometer calcium fluoride loaded by bentonite is scattered in sand and has the effects of lubricating and strengthening, a non-stick impermeable layer can be formed, and sand sticking of the casting is avoided. The composite modified water glass sand is good in comprehensive performance, good in thermal stability, high in precision and capable of meeting the requirement for pouring of the high-precision pump valve casting.

The invention discloses a high temperature direct formate fuel cell (Na-DFFC) with electricity and alkali salt co-production belonging to the field of fuel cells, including a non-platinum cathode and a non-platinum anode using polytetrafluoroethylene (PTFE) as a binder, and a cationic membrane of a sodium ion form. Compared with traditional formate fuel cells, additional electrolyte (such as sodium hydroxide) is not required to be added to the Na-DFFC anode, so that the energy density of the system is improved, and the design complexity and cost of the system are reduced. In addition, by replacing the traditional anionic membrane with the cationic membrane of a sodium ion form, the shortcomings of poor thermal stability and poor chemical stability of the anionic membrane are overcome. At the same time, by replacing the traditional ion exchange resin binder with the polytetrafluoroethylene (PTFE), the fuel cell compared with the traditional fuel cell is more resistant to high temperature. In addition, important chemical raw materials including sodium hydroxide and sodium carbonate are produced along with electricity outputting by the Na-DFFC, that is, forming the so-called electricity and alkali salt co-production, so that the range of applications is very wide.

The invention belongs to the technical field of polymer materials, and specifically provides an ABS color masterbatch, which is composed of the following components by weight: 100-120 parts of a PE carrier; 2-20 parts of a toner; and 3-8 parts of a dispersant; Heat stabilizer 0.5~3 parts; flame retardant 0.1~10 parts. The invention has good coloring effect, simple production process, easy operation, low production cost, less environmental pollution, and broad application prospect, and solves the problems of unstable color and difficult control of color difference caused by poor thermal stability of the existing color masterbatch. .

The invention discloses a thermochromic composite material for an intelligent window and a preparation method of the thermochromic composite material, water-soluble CMC is introduced into an aqueous dispersion of PNIPAM or HPC, and the phase change temperature of PNIPAM or HPC is reduced by using the hydrophilicity of CMC; the number of scattering centers of PNIPAM or HPC is increased by utilizing a molecular skeleton formed by CMC in water, the solar energy modulation capability is improved, and the thermal stability of the thermochromic material is enhanced. The method is simple, effective and wide in application prospect.

The invention discloses a method for improving the thermal stability of glucose oxidase, and belongs to the field of enzyme engineering. A fusion enzyme is obtained by fusing amphiphilic oligopeptideson the N end on the basis of the aspergillus-niger-sourced glucose oxidase. Compared with initial enzymes, the fusion glucose oxidase has the advantages that after the incubation for 30 min under thecondition of 60 DEG C, the residual enzyme activity is 3.8 times of the initial enzyme activity; the thermal stability of the fusion enzyme is obviously improved. By using the method, the thermal stability of glucose oxidase is effectively improved.

The invention discloses a tetragonal-zirconia-structured ultra-low dielectric constant microwave dielectric ceramic EuY2V3O12 with low loss and high thermal stability and a preparation method thereof. The preparation method comprises the steps of (1) weighing and batching original powder with the purity being above 99.9 percent (weight percentage) of Eu2O3, Y2O3 and V2O5 according to the constitute of EuY2V3O12; (2) performing wetted ball grinding and mixing on the material of the step (1) for 12 hours, wherein a ball milling medium is distilled water, and pre-sintering at an 800 DEG C of air atmosphere for 6 hours after drying; (3) adding a binding agent into the powder prepared in the step (2) and pelleting, then performing compression moulding, and finally sintering for 4 hours at an 850 to 900 DEG C of air atmosphere; the binding agent adopts a polyvinyl alcohol solution with the mass concentration being 5 percent, and the additive amount of polyvinyl alcohol accounts for 3 percent of the total mass of the powder. The ceramic prepared by the preparation method is well sintered at the temperature below 900 DEG C, the dielectric constant reaches 10.3 to 10.7, the quality factor Qf value of the ceramic reaches up to 156000 to 188000GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.

The invention discloses an accumulator case material for new energy automobiles. The accumulator case material for new energy automobiles comprises an ABS (acrylonitrile-butadiene-styrene) resin, modified polypropylene, disodium hydrogen phosphate, tricumene phosphate, 3-aminopropyltriethoxysilane, 2-hydroxypropyl acrylate, tri(1,3-dichloro-2-propyl)phosphate, zinc borate, magnesium oxide, carbon black, 4,4'-dioctyl diphenylamine, tetraethylene glycol diacrylate and sodium 4-amino-5-hydroxynaphthyl-2,7-disulfonate. The accumulator case produced from the case material has favorable heat stability and chemical properties (oxidation resistance and corrosion resistance), and also has favorable mechanical properties (impact resistance and shock resistance), so the service life of the accumulator case is prolonged, thereby lowering the use cost and providing favorable use technique supports for new energy automobiles.

N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole and a preparation method thereof relate to carbazole derivatives and preparation methods thereof and aim to solve the problems of poor thermal stability and photochemical stability of existing two-photon absorption materials. The structural formula of the N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole is shown as follow, wherein the R is CnH2n+1 or benzyl, and the n ranges from 1 to 8. The preparation method of the N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole includes: firstly, mixing 3, 6-dimethyl acyl-N-alkyl-carbazole, 2-methyl quinoline and acetic anhydride uniformly, then mixing with water uniformly and regulating the pH (potential of hydrogen) value to be 7.0; and secondly, extracting by dichloromethane, collecting extract and obtaining the N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole. The carbazole derivatives of the N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole have two-photon absorption function and fine dissolubility, thermal stability and photochemical stability. The N-alkyl group-3, 6-di-(2-quinoline) vinyl) carbazole can be applied to the technical field of two-photon absorption materials.