25 results about "Activation temperature" patented technology

According to the packaging method for the chip atomic clock physical system, the getter with the low activation temperature and the solder ring with the high heat sealing temperature are selected, meanwhile, the temperature gradient with the degassing temperature, the getter activation temperature and the vacuum heat sealing temperature rising in sequence is designed, the getter is deposited on the inner wall of the ceramic cap through the chemical vapor deposition technology, and the chip atomic clock physical system is obtained. The integrated structure of the ceramic cap and the getter is formed, the adsorption area is increased through the full-coverage design of the getter, in the out-of-furnace assembly link, the photoelectric component is fixed through a preset bearing area of the ceramic base, the solder ring is limited through an edge sealing area, and the alignment deviation is detected and adjusted in cooperation with an assembly clamp for positioning and a detection tool for detecting and adjusting. The system to be packaged is ensured to be accurately aligned before entering the furnace, part dislocation caused by view limitation in traditional in-furnace assembly is avoided, the comprehensive effects of equipment demand reduction, production efficiency improvement and packaging precision improvement are finally achieved, and it is ensured that the frequency stability and the service cycle of the chip atomic clock meet the use demand.

The application discloses a single-component water-based polyurethane adhesive and a preparation method thereof. The single-component water-based polyurethane adhesive comprises the following components in parts by weight: 20-100 parts of a water-based polyurethane dispersion, 20-100 parts of a water-based VAE emulsion, 0.1-0.5 parts of a thickening agent, 0.1-0.5 parts of a wetting agent, and 0.01-0.05 parts of a defoaming agent. The single-component water-based polyurethane adhesive has the characteristics of excellent initial adhesion, low activation temperature, excellent heat resistance, aging resistance and wet heat resistance, and can be single-component brush coated, is very suitable for a manual coating process of an automobile interior steering wheel and other interior parts, and can greatly improve production efficiency and save cost.

The invention relates to the technical field of graphite electrode roasting, and discloses a method for impregnating a graphite electrode through secondary roasting. Through the synergistic effect of an intelligent cooperative temperature control method, a whole-process inert protection system, a waste heat gradient utilization path and clean combustion directional pollution discharge, high-precision stable temperature control of the secondary roasting procedure is achieved, the activation temperature fluctuation of the coke powder is compressed to be within, the activation uniformity of the coke powder and the roasting consistency of the green body are guaranteed, and the quality of the green body is improved. The mechanical strength and the conductivity of the graphite electrode are greatly improved, the oxidation loss rate of a green body is reduced to below 0.08% through a nitrogen gas curtain and a multi-stage oxygen removal design, pollutant degradation is avoided, a protective medium is protected, meanwhile, the waste heat utilization rate is greatly improved, the fuel gas consumption is reduced, and the reuse frequency of coke powder is increased by utilizing the waste heat of one-time roasting; and finally, double improvement of product quality stability and production economy is realized.

The present application provides a modified bio-based waterborne polyurethane, a method for preparing same, and use thereof. The modified bio-based waterborne polyurethane is prepared from the following starting materials: 50-150 parts by weight of a bio-based polyol, 5-30 parts by weight of a diisocyanate, 0.1-10 parts by weight of a reactive emulsifier, 20-200 parts by weight of an alkenyl-containing monomer, and 0.01-5 parts by weight of an initiator, wherein the diisocyanate includes aliphatic diisocyanates containing an odd number of carbon atoms. According to the present application, by means of the design and compounding of the starting materials, the modified bio-based waterborne polyurethane is made to have an adjustable thermal activation temperature, high film-forming strength, good weather resistance, complete resistance to yellowing, good adhesion to different substrates, excellent bonding performance, heat resistance, water resistance, hydrolysis resistance, stability, and high bio-base content. The modified bio-based waterborne polyurethane is prepared using a solvent-free method and is an environmentally friendly high-performance waterborne polyurethane product.

The invention discloses a regulation and control method of a porous carbon pore structure, and relates to the technical field of new energy. The method for regulating and controlling the pore structure of the porous carbon comprises the steps that the pore volume of an activated carbonized material is calculated and predicted through a prediction formula, and the prediction formula relates to various parameters such as the initial pore volume V0 and the volatile component content V of the carbonized material, the activated gas flow Q, the feeding amount M of the carbonized material, the activation temperature T, the activation time t and the index S about whether stirring is conducted or not in the activation process. The prediction formula is shown in the specification. According to the regulation and control method for the pore structure of the porous carbon, provided by the embodiment of the invention, direct quantitative correlation of raw material-process-pore volume is established, and the hysteresis limitation of traditional dependence on test after activation is broken through. In the prediction formula, irrelevant parameter interference is eliminated, the structure is simple, calculation is efficient, prediction and process debugging guidance can be completed only in several minutes, the debugging period is effectively shortened, the production cost is remarkably reduced, the efficiency is improved, and industrial production requirements can be met.

The invention provides an environment-friendly water-based paint for buildings and a processing method thereof. The environment-friendly water-based paint comprises the following components: 40-60 parts of an elastic grafted hydrophobic emulsion, 5-10 parts of a low-temperature activated cross-linking agent, 3-8 parts of corrosion inhibitor microcapsules, 15-25 parts of pigments and fillers, 1-3 parts of a dispersing agent, 0.5-2 parts of a wetting agent, 0.3-1 part of a defoaming agent, 0.5-2 parts of a thickening agent, 1-4 parts of a coalescing agent and 10-20 parts of deionized water. The low-temperature activated modified isocyanate cross-linking agent is adopted, the activation temperature is low, rapid cross-linking curing can be achieved at the temperature of about 5 DEG C, the film forming time is greatly shortened, meanwhile, the modified cross-linking agent is good in compatibility with elastic grafted hydrophobic emulsion, the cross-linking density of a coating is improved, the adhesive force of the coating and a base material reaches the first level, and the coating is not prone to falling off. The coating is prevented from falling off and cracking in a low-temperature and high-humidity environment

The invention relates to the field of thermal indicating devices in the form of multi-temperature irreversible thermal indicators having a thermal indication scale that includes small thermal sensitive elements and an additional large thermal sensitive element. The present irreversible thermal indicator comprises a base having disposed thereon thermal sensitive elements that are capable of irreversibly changing their external appearance when respective corresponding threshold temperatures are reached, said thermal sensitive elements including at least two small thermal sensitive elements (STE1 and STE2) having different activation temperatures and at least one large thermal sensitive element (LTE). The area of the LTE is at least twice as large as the area both of STE1 and of STE2. The invention provides for the increased operational safety of equipment provided with thermal indicators according to the invention by allowing easy interpretation of the thermal indicator monitoring results without decreasing the informational value thereof.

The application discloses a preparation method of a high specific surface area metal-based composite getter material, and belongs to the technical field of getter materials, and is used for solving the technical problems that the specific surface area, getter performance, activation temperature and anti-powder loss performance of the metal-based composite getter material in the prior art need to be further improved, and specifically comprises the following steps: a porous Ti-Mo bearing skeleton is prepared by compressing and forming a mixture of titanium powder, molybdenum powder, a pore forming agent and a binder skeleton mixture and vacuum sintering; zirconium-vanadium alloy powder, hydrogenated metal particles and amorphous alloy powder are prepared into composite microparticles, the composite microparticles are introduced into the pore channels of the Ti-Mo skeleton through a vacuum impregnation method, and then heat pulse treatment is performed, so that a composite material with a multi-stage pore structure and a stable bearing structure is formed, the composite material has the advantages of a high specific surface area, a low activation temperature, excellent getter performance and a reduced powder loss rate.

The application relates to the technical field of activated carbon preparation, in particular to a green preparation method and device of modified activated carbon. The preparation device comprises a base, a carbonization assembly and an activation assembly. Raw materials for activated carbon preparation are carbonized by the carbonization assembly, transferred to a transfer cavity and transported into an inner cylinder by a spiral conveying piece to be activated. According to the carbonization and activation temperature characteristics, the two processes are coaxially combined. On the basis of ensuring the uniform temperature distribution of the two processes, the heat source is integrated, the heat loss is effectively reduced, the automatic switching of the two processes is realized by the transfer cavity, the process transfer labor and equipment investment are reduced, compared with the prior art which only realizes the process switching by changing the processing conditions, the application also has the continuity of processing and high automation degree.

Safety valve (1) for a pressure device comprising: - a valve housing (3) arranged to connect the safety valve (1) to the pressure device, - a transfer channel (8) arranged to be in fluidic communication with the pressure device, - a drain channel (7), - a sealing element (6) arranged to seal the transfer channel (8) when it is in a sealed state and arranged to allow free passage between the transfer channel (8) and the drain channel (7) when it is in a drained state, - an electro-pyrotechnic device (2), - a thermal release element (4) arranged to maintain the sealing element (6) in the sealed state below a predetermined activation temperature and to allow free passage of the sealing element (6) above the activation temperature,characterized in that the thermal release element (4) is arranged between the sealing element (6) and the electro-pyrotechnic device (2) such that the electro-pyrotechnic device (2) participates in maintaining the sealing element (6) in the sealed state. Figure for the abstract: Fig. 1,

A pump system including a prevention mechanism for preventing excessive fluid temperature buildup of system fluid. The overheat prevention mechanism includes a thermally-responsive control component made with a thermally-responsive material. The thermally-responsive control component is located in the pump system such that the thermally-responsive material is in thermal communication with the system fluid for effecting a change in temperature of the thermally-responsive material. The thermally-responsive material is configured to have an activation temperature that is a predefined amount less than a maximum operating temperature of the system fluid. The thermally-responsive control component is configured to cooperate with a pump control mechanism in the system to decrease pump output pressure in response to the thermally-responsive material being heated by the fluid to a temperature that is equal to or greater than the activation temperature of the thermally-responsive material.

The invention discloses a high-strength composite porous getter based on a zirconium-based alloy and a preparation method and application of the high-strength composite porous getter, and belongs to the technical field of gas purification. According to the technical scheme, zirconium-based alloy serves as a framework, LaNi5 phase alloy serves as a catalytic activating agent, graphite serves as a pore-forming template, a metal coating process is conducted on the surface after partial sintering, a high-strength porous getter is constructed, a metal film is deposited on the surface through magnetron sputtering after sintering, the metal film can be activated at low temperature and dissolved in a bulk phase to form a metastable state, and the high-strength porous getter is formed. After the getter is used, when the surface is passivated, metastable metal on the surface is separated out, so that the body-phase getter is protected, complex auxiliaries are not needed in the preparation process, and therefore low-temperature rapid activation, high specific surface area and high strength are achieved at the same time. The method can be widely applied to the fields of inert gas purification, high-power electron tube gas purification and the like.

The application belongs to the field of infrared detector manufacturing, and specifically discloses a kind of ceramic package pulse current activation methods of infrared detector. The method comprises: providing a ceramic package infrared detector assembly, the two ends of the sheet-shaped non-evaporable getter in the assembly are fixed on two first type conductive columns;Electricity contact probe is contacted with the first type conductive column;Preheating current is applied to the getter through the first type conductive column, then high-frequency pulse current is applied to activate, so that the getter body reaches the activation temperature due to Joule effect;During the pulse current activation process or after activation, the detector chip is subjected to low-temperature thermal stabilization treatment. The application realizes the rapid local activation of the getter by pulse current, shortens the process time, reduces the energy consumption, avoids thermal damage, and improves the performance of the detector, and is especially suitable for ceramic packaged infrared detectors.

The invention relates to the technical field of pouring sealants, and discloses an epoxy pouring sealant and a preparation method thereof. The epoxy pouring sealant comprises an epoxy resin composition and a curing agent composition, the curing agent composition comprises a main curing agent and a composite curing accelerator. Wherein the composite curing accelerator comprises a first curing accelerator, a second curing accelerator, a third curing accelerator,..., an nth curing accelerator according to the activation temperature from high to low, the difference value of the activation temperature of the ith curing accelerator and the activation temperature of the (i-1) th curing accelerator is not higher than 60 DEG C, and n is an integer larger than or equal to 3. The epoxy pouring sealant has the characteristic of rapid and thorough curing, and also has excellent cracking resistance.

This document discloses printer-activated environmental exposure indicators using chemical encapsulation. An example of an activatable environmental exposure indicator comprises a substrate, an environmental indicator material configured to respond to a predetermined environmental stimulus, a plurality of microcapsules on or embedded in the substrate, and a barcode layer containing a barcode symbol and a viewing area. The microcapsules contain the environmental indicator material and are designed to respond to at least one activation temperature and activation pressure by enabling the release of the environmental indicator material from the microcapsules. The environmental indicator material is designed to respond, upon release from the microcapsules, to the action of the predetermined environmental stimulus by producing a detectable response.

The invention relates to a sulphoaluminate cement concrete thermal excitation device and construction system.The device comprises a low-pressure atomized gas generation unit arranged outside a stirring tank and provided with a valve, and the valve is provided with a low-pressure atomized gas outlet and a low-pressure atomized gas inlet; the temperature detection unit is arranged in the stirring tank, and the temperature detection unit is suitable for collecting the concrete temperature; and the intelligent control unit is in communication connection with the temperature detection unit and the valve, and the intelligent control unit controls the valve to be opened or closed according to the temperature detected by the temperature detection unit, so that the concrete temperature is maintained within a preset excitation temperature range. Through cooperative control of the temperature detection unit, the valve and the intelligent control unit, the temperature of the concrete is stably maintained in an optimal thermal excitation interval, and compared with traditional extensive heating, it can be ensured that the concrete is heated to a preset optimal excitation temperature window, so that rapid hardening of the concrete is triggered on the premise that flash setting is avoided, and the service life of the concrete is prolonged. And the construction efficiency and effect are ensured.

The invention discloses a preparation method of a composite getter based on a eutectic ZSM5 / ZSM11 molecular sieve, which comprises the following steps: by taking ZSM5 and ZSM11 eutectic molecular sieves with an MFI / MEL symbiotic structure as carriers, converting the molecular sieves into an ammonium type through ammonium exchange, then converting the molecular sieves into a hydrogen type through heat treatment, and then loading an active copper species through an equivalent-volume impregnation method, thereby obtaining the composite getter based on the ZSM5 / ZSM11 molecular sieve. And finally, performing medium-temperature roasting in an inert atmosphere, and performing vacuum sealing in an aluminum shell container. Through the mode, the getter prepared by the preparation method of the composite getter based on the eutectic ZSM5 / ZSM11 molecular sieve has the advantages of excellent adsorption performance, good thermal stability, low activation temperature, safety and environmental protection.

The invention discloses a preparation process of a coal-based high-micropore carbon electrode material and application of the coal-based high-micropore carbon electrode material in a supercapacitor, and relates to the technical field of energy storage electrode materials. According to the method, lignite or bituminous coal is subjected to solvent extraction at normal temperature and normal pressure, raffinate is subjected to hydrothermal pretreatment, and efficient activation is realized by adopting a gradient temperature control method of low-temperature pore channel pre-construction-high-temperature short-time etching. Comprising the following steps: performing solvent extraction on a coal sample at normal temperature and normal pressure; carrying out hydrothermal treatment on the extracted heavy component; mixing the hydrothermal product with a chemical activator according to a certain proportion, placing the mixture in a tubular furnace under a protective atmosphere, firstly heating to a primary activation temperature for activation, and then heating to a high activation temperature; and pickling, washing and drying the activated product to obtain the coal-based porous carbon material. The process is green, simple, efficient and energy-saving, and solves the problems of non-uniform contact of an activator, easy collapse of a pore structure, low graphitization degree and the like in a traditional activation method.

The application discloses a silicon carbide wafer processing technology, which comprises the following steps: S1, permanently bonding a silicon carbide substrate on a silicon carrier plate; S2, completing thinning of the silicon carbide substrate and other front surface processes of the wafer except high-temperature processes; S3, transferring the silicon carbide substrate to a graphite tray, releasing the permanent bonding between the silicon carbide substrate and the silicon carrier plate, and removing the silicon carrier plate; S4, carrying out high-temperature processes on the silicon carbide substrate by using the graphite tray; S5, bonding a glass carrier plate to the back surface of the silicon carbide substrate and removing the graphite tray; S6, bonding a glass carrier plate to the front surface of the silicon carbide substrate and removing the glass carrier plate on the back surface by debonding; S7, completing wafer processes on the back surface of the silicon carbide substrate; and S8, transferring the silicon carbide substrate to a cutting mold, removing the glass carrier plate on the front surface by debonding, and completing wafer cutting. The silicon carbide substrate is thinned by using the silicon carrier plate, and the silicon carbide substrate is carried out high-temperature processes by using the graphite tray, so that the processing difficulty of the silicon carbide material with high hardness and high activation temperature is overcome.

The group of inventions relates to an irreversible and enduring temperature indicator element for quickly and accurately indicating that at least one temperature has been exceeded, as well as to a temperature indicator device containing said element. What is proposed is a gas-filled temperature-sensitive element containing an absorbent material, said element being designed to be capable of irreversibly changing colour when a temperature threshold is exceeded, wherein the element comprises: a layer which is non-transparent to at least a part of the visible light spectrum and is made of a gas-filled hot-melt material containing cavities filled with a gas phase, as well as containing a substance or a mixture of substances with a melting point that is close to the activation temperature of the temperature-sensitive element; and an absorbent material which is connected to the gas-filled hot-melt material and is capable of absorbing the molten hot-melt phase thereof. A temperature indicator device which utilizes such an element is also disclosed. The group of inventions provides an increase in the accuracy and speed of indication that at least one temperature threshold has been exceeded, while also providing that the external appearance of the temperature-sensitive element is capable of enduring under a wide range of working conditions, including vibrational loads.

The application relates to the technical field of chip welding, and particularly discloses a vacuum reflow process for chip welding and mounting. The vacuum reflow process comprises the following steps: S1, a gas replacement stage; S2, a vacuum temperature rising stage 1: making the chip welding and mounting to be welded in a vacuum and rising to 100-120 DEG C which is higher than a formic acid activation temperature; S3, heat preservation and formic acid feeding: heat preservation for 6.5-9.5 min at the final temperature of S2, and feeding formic acid in the heat preservation process; S4, a vacuum temperature rising stage 2; S5, heat preservation and nitrogen feeding; and S6, cooling to room temperature. After the chip welding and mounting is welded by the process, the number of solder balls on the chip is remarkably reduced, and the welding quality is guaranteed.

Activatable thermal indicators with thermally expansive materials are disclosed herein. An example is provided by an activatable indicator including a plurality of microcapsules, each of the plurality of microcapsules further including a frangible shell, a volatile material contained in the frangible shell, configured to transition to a gas when heated above a predetermined activation temperature, wherein responsive to a first activation action including an application of heat configured heat above the predetermined activation temperature, the volatile material causes the frangible shell to weaken or rupture, and a payload contained in the frangible shell, the payload containing a liquefiable material configured to liquefy responsive to a predetermined environmental exposure, the payload configured to be released from the frangible shell when the frangible shell is ruptured.

The invention discloses gambiered canton gauze composite fabric, a hot-pressing laminating method thereof and application of the gambiered canton gauze composite fabric in shoes, shoes, bags and suitcases. The composite fabric comprises a gambiered canton gauze layer, a functional base material layer and a polyurethane hot melt adhesive net film bonding layer located between the gambiered canton gauze layer and the functional base material layer. The activation temperature of the rubber net film is 105-115 DEG C, the hot pressing temperature is 140-155 DEG C, and the specific gravity is 1.10-1.14; the hot-pressing laminating method comprises the steps of laminating, hot-pressing and standing and curing, and preferably adopts a sectional type hot-pressing process. Low-temperature and firm bonding of gambiered canton gauze is achieved through the specific glue net film, the fiber structure and the surface texture of the gambiered canton gauze are effectively protected, and meanwhile the composite fabric is endowed with excellent peel strength and heat resistance. Based on the high elasticity and thermoplasticity of the rubber net film, the composite fabric can be applied to shoe toes, bag bodies and other shoes and luggage products needing three-dimensional curved surface modeling through hot press molding, the technical problem that traditional gambiered canton gauze is difficult to stereoscopically shape is solved, and an effective scheme is provided for innovative application of traditional fabric in the modern fashion industry.

This invention provides a surface-modified walnut shell plugging material for drilling fluids and its preparation method. Compared with existing technologies, this invention innovatively uses surface amination modification and surface coating modification methods to modify the walnut shell in the bridging plug plugging material. The surface-modified walnut shell has diverse surface functional properties such as high temperature resistance, reactivity, and adhesion. After the surface-modified walnut shell enters the leakage layer and reaches the activation temperature, its surface properties adsorb and adhere to other compatible plugging materials. Under high pressure, they come into close contact, are squeezed and deformed, and the different materials are bonded together to form a bridging network structure, further densifying / solidifying the plugging layer, improving the sealing performance and the density of the plugging layer, as well as the pressure-bearing capacity of the plugging retention layer, thus greatly improving the leakage prevention and plugging efficiency. This meets the development needs of low-cost and high-quality leakage prevention and plugging technology, and has good economic and social benefits for accelerating and improving the efficiency of drilling projects.

Activatable thermal indicators with thermally expansive materials are disclosed herein. An example is provided by an activatable indicator including a plurality of microcapsules, each of the plurality of microcapsules further including a frangible shell, a volatile material contained in the frangible shell, configured to transition to a gas when heated above a predetermined activation temperature, wherein responsive to a first activation action including an application of heat configured heat above the predetermined activation temperature, the volatile material causes the frangible shell to weaken or rupture, and a payload contained in the frangible shell, the payload containing a liquefiable material configured to liquefy responsive to a predetermined environmental exposure, the payload configured to be released from the frangible shell when the frangible shell is ruptured.