222 results about "Thermogravimetric analysis" patented technology

Provided is a flux that can suppress the generation of voids when an indium alloy sheet is used to perform a continuous reflow under different temperature conditions. The present invention employs a flux that contains a rosin ester, an organic acid (A), and a solvent (S). The organic acid (A) includes a dimer acid (A1) that demonstrates a weight reduction rate of not more than 1 mass % in a thermogravimetric analysis in which the dimer acid is heated up to 260° C. at a temperature rising rate of 10° C. / min. The solvent (S) includes a solvent (S1) that demonstrates the weight reduction rate of at least 99 mass % in a thermogravimetric analysis in which the solvent (S1) is heated up to 150° C. at a temperature rising rate of 6° C. / min.

A quantum dot composite configured to emit green light or red light. The quantum dot composite including a polymer matrix, and a plurality of quantum dots dispersed in the polymer matrix, the plurality of quantum dots include a semiconductor nanocrystal core comprising indium and phosphorus. As determined by differential scanning calorimetry, the quantum dot composite exhibits an intensity of a peak between about 350° C. to about 450° C. that is about 8 times or more and about 13 times or less relative to an intensity of a peak between about 200° C. and about 300° C. in a thermogravimetric analysis graph.

The invention provides a graphite negative electrode active material and a preparation method thereof, a negative electrode material, a secondary battery, a battery pack and an electric device. A thermogravimetric analysis curve of the graphite negative electrode active material shows that the initial weight loss temperature T0 is 610-715 DEG C; the initial weight loss temperature T0 is the temperature corresponding to the intersection point of the tangent line at the horizontal position in front of the step of the thermogravimetric analysis curve and the tangent line at the maximum weight loss rate. When the graphite negative electrode active material is used for a battery negative electrode, consumption of active ions in SEI film forming can be reduced, consumption of the active ions in the battery storage process can be reduced, and the battery has high first coulombic efficiency and good storage resistance.

The invention discloses a multi-scale performance evaluation and optimization method and device for well cementation cement stone, and relates to the technical field of oil exploitation, the well cementation cement stone is subjected to nanoindentation test and scanning electron microscope microstructure test, and a mechanical property-microstructure test result is obtained; performing electronic computer tomography and mercury injection test on the well cementation cement stone, and constructing a pore network three-dimensional model; performing triaxial mechanical property test, thermogravimetric analysis and thermal expansion test on the well cementation cement stone to obtain a thermal-mechanical coupling test result; performing X-ray diffraction and X-ray fluorescence spectrum analysis on the well cementation cement stone to obtain mineral phase information and element information of the cement stone; according to the method, a mechanical property-microstructure test result, topological parameters, a thermal-mechanical coupling test result, cement stone mineral phase information and element information are fused, an optimal design scheme for target well conditions is generated, multi-dimensional performance testing and characterization are achieved, and an accurate basis is provided for well cementation cement stone optimal design and quality control.

The invention relates to the technical field of quality analysis of plastic packaging materials, and particularly discloses a quality analysis method of a plastic packaging product, which comprises the following steps of: acquiring chemical composition information of a target material by adopting Fourier transform infrared spectroscopy and thermogravimetric analysis, and constructing an atomic-scale three-dimensional molecular model on the basis of polymer types and auxiliary ratio; auxiliary agent diffusion behaviors are simulated and tracked through molecular dynamics, and key transmission parameters are obtained; importing the parameters into a finite element model, establishing a multi-physics field coupling migration simulation model, and simulating the migration trends of the assistants under different environmental conditions; establishing a quantitative correlation model to predict the long-term stability of the material by combining accelerated aging experiment data; according to the method, the prediction precision of the service life and the function stability of the plastic packaging material is improved, the research and development cost is reduced, and the product quality consistency and the market competitiveness are improved.

The invention relates to the technical field of composite material performance prediction, and discloses a composite material flame retardant property and thermal stability prediction method based on thermogravimetric analysis and infrared spectrum data fusion. The invention aims to solve the problem that it is difficult to effectively fuse multi-modal data to realize quantitative prediction in the prior art. The method comprises the following steps: firstly, collecting thermogravimetric and infrared spectrum combined data, calculating gas transmission lag time, and carrying out forward correction on infrared spectrum data to realize time sequence alignment; then solid-phase thermogravimetric feature vectors and gas-phase infrared feature vectors are extracted, and a fusion feature matrix is generated; extracting solid-phase and gas-phase characteristics respectively by using a dual-channel LSTM network, and performing weighted fusion based on a self-attention mechanism; and finally, synchronously outputting a flame retardant index predicted value and a flame retardant grade classification result through numerical mapping and classification judgment. According to the method, multi-dimensional feature mining of the whole pyrolysis process of the material is realized, and a rapid and accurate digital evaluation means is provided for screening of the flame-retardant material.

The invention discloses an epoxy resin pyrolysis kinetics optimization method and device. The invention aims to accurately obtain the pyrolysis kinetic parameters (such as activation energy and pre-exponential factors) of the epoxy resin through a TG-FTIR combined technology (thermogravimetric analysis and Fourier transform infrared spectroscopy synchronous monitoring), and optimize the pyrolysis conditions (temperature, heating rate and retention time) based on the dynamic change of the product, so as to obtain the pyrolysis kinetic parameters (such as activation energy and pre-exponential factors) of the epoxy resin. Accurate acquisition of pyrolysis kinetic parameters, improvement of pyrolysis condition optimization efficiency, accurate control of a multi-stage pyrolysis path and balance of energy consumption and product value are realized.

The invention relates to the technical field of temperature measurement of crystal materials, and relates to a temperature measurement method for SiC crystal thermogravimetric analysis based on Si < + > ion and neutron dual irradiation, and the method specifically comprises the following steps: S1, dual irradiation of a SiC crystal; s2, annealing treatment; s3, carrying out thermogravimetric test; s4, processing thermogravimetric test data; s5, measuring the temperature of the environment to be measured; the expression form of the temperature calibration equation obtained in the step S4 is b = alpha + beta T * + gamma T * 2 + delta T *; according to the temperature measurement method for thermogravimetric analysis of the Si < + > ion and neutron dual-irradiation SiC crystal, the internal structure of the SiC crystal is changed by performing annealing treatment on the SiC crystal at different temperatures, thermogravimetric testing is performed on the SiC crystal subjected to annealing treatment at different temperatures, data are analyzed, a polynomial equation is established, and the extremely high environment temperature can be effectively tested; and the method has relatively high accuracy.

The invention discloses a proton solid oxide and a preparation method and application thereof, and the proton solid oxide comprises a trigonal system ABO3 type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta >, a Ruddlesden-Popper type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta > and Ag nanoparticles. The proton solid oxide provided by the invention realizes a multi-phase coexistence structure, thermogravimetric analysis shows that the proton solid oxide meets the requirements of high catalytic activity and ion / electron transfer capability, and the structure not only improves the catalytic activity of the material, but also enhances the mechanical stability and thermal expansion resistance of the material, so that the proton solid oxide can be used for preparing a composite material. And the problems of unstable catalytic activity and high-temperature structure degradation caused by additional introduction of Ni-containing substances are avoided.

The application provides a cement rotary kiln batching and feeding method for synergistically treating flue gas adsorbents, and relates to the technical field of cement clinker production, and comprises the following steps: sampling flue gas adsorbents for high-temperature thermogravimetric analysis, and establishing a batch fuel characteristic file; calculating a mixed equivalent calorific value according to the calorific values of new and old batches, and adjusting the mixed equivalent calorific value according to the calorific value difference gradient; sampling from a homogenizing bin discharge pipeline for high-temperature thermogravimetric analysis to obtain a measured calorific value and a real-time combustion characteristic index; comparing the measured calorific value with the calibrated mixed equivalent calorific value, and performing corresponding operations according to the deviation degree; establishing a heat load balance model to determine the optimal feeding amount of flue gas adsorbents and coal powder; determining the combustion type according to the real-time combustion characteristic index, and determining the mixing mode of flue gas adsorbents and raw materials, feeding after mixing according to the optimal feeding amount and raw materials, and simultaneously spraying coal powder into the cement rotary kiln. The scheme can improve the temperature stability of the cement rotary kiln, and realizes the recycling of flue gas adsorbents.

The present application discloses a method and application for analyzing and detecting the content of a negative electrode material formula, wherein the analysis and detection method comprises: taking a portion of the negative electrode material and performing a first thermogravimetric analysis to obtain a first weight loss rate; removing the aqueous dispersant from the remaining negative electrode material to obtain a negative electrode material free of the aqueous dispersant; performing a second thermogravimetric analysis on the negative electrode material free of the aqueous dispersant to obtain a second weight loss rate; performing a third thermogravimetric analysis and a fourth thermogravimetric analysis on standard substances of the aqueous binder and the aqueous dispersant, respectively, to obtain a third weight loss rate and a fourth weight loss rate; and taking the product of the ratio of the second weight loss rate to the third weight loss rate and 100% as the mass content of the aqueous binder in the negative electrode material. The method for analyzing and detecting the content of the negative electrode material formula of the present application can verify the removal effect of the aqueous dispersant through the TG curve, and the analytical detection results of the content of the binder and the like are highly reliable and accurate.

The invention relates to the technical field of silk identification, in particular to a method for identifying common mulberry leaves and industrial feed silkworm rearing raw silk, which comprises the following steps: S1, cutting a sample to below 5mm; s2, performing thermal decomposition on the sheared sample to obtain the proportion of residual substances, and testing the sample by using a thermogravimetric analyzer under different atmosphere conditions and heating rate conditions; s3, drawing a curve graph, and obtaining a thermogravimetric curve of the sample by taking the thermal decomposition temperature as an abscissa and the mass residue percentage of the sample as an ordinate. According to the method, the essential difference of the common mulberry leaves and the silk for breeding silkworms with industrial feed in mineral substance residue is utilized, the mineral substance content of the raw silk produced by the silkworms fed with the feed is relatively high, and the content of the mineral substances is relatively high; the content of mineral substances in the raw silk produced by silkworms eating mulberry leaves is low, the mineral substances in the silk are derived from food, the addition amount of the mineral substances in feed is high, and the purpose of identifying the attributes of the raw silk is achieved by burning off organic matters in the raw silk and evaluating the proportion of inorganic ash residues.

The invention provides a thermogravimetric analysis-based aluminum oxide ignition loss accurate detection method, and relates to the technical field of analysis and detection.The method comprises the following steps: a, carrying out standardized pretreatment on an aluminum oxide sample to obtain a test sample meeting the thermogravimetric analysis requirement; b, placing the test sample in a thermogravimetric analyzer, firing and heating under set experimental conditions, and recording a curve of the mass of the test sample along with temperature change in real time to obtain a thermogravimetric curve; c, on the basis of the thermogravimetric curve, extracting feature data points related to alumina burning loss; and d, calculating the ignition loss of the alumina sample according to the extracted characteristic data points. According to the method, through standardized pretreatment, accurate thermogravimetric analysis and feature point extraction, rapid and accurate measurement of alumina burning loss is achieved, the method is suitable for alumina quality control in industrial production, detection errors and operation complexity are remarkably reduced, and efficient technical support is provided for material performance evaluation.

The invention relates to a tobacco leaf proportion design method and device, computer equipment and a computer readable storage medium. The method comprises the following steps: determining a thermal weight loss prediction equation corresponding to various tobacco leaves based on thermogravimetric analysis; acquiring information of multiple groups of tobacco leaf groups; the tobacco leaf group information comprises various tobacco leaves and corresponding tobacco leaf proportions; determining thermal weight loss statistical information corresponding to each group of tobacco leaf group information according to the thermal weight loss prediction equation of each type of tobacco leaves and the multiple groups of tobacco leaf group information; and according to the thermal weight loss statistical information and a preset condition, determining a tobacco leaf ratio corresponding to the optimal tobacco leaf group. By adopting the method, the thermal weight loss rate of the tobacco can be accurately predicted, and the tobacco ratio of the tobacco group is optimized according to the thermal weight loss statistical information and the preset conditions; the problem that the sensory quality and the smoke release characteristic of a heated cigarette product are difficult to keep consistent due to the fact that the fluctuation of the thermal weight loss rate of the heated cigarette product is large is solved.

The utility model relates to the technical field of microwave equipment, in particular to a microwave thermogravimetric analyzer which comprises a support frame, a furnace body is arranged in the support frame, the upper end of the furnace body is connected with a furnace cover, and the lower end of the furnace body is connected with a bottom sealing plate; a resonant cavity is formed by the furnace body, the furnace cover and the inner space of the sealing plate, and a magnetron for emitting microwaves into the resonant cavity is arranged on the furnace body; a weighing module is further arranged on the bottom sealing plate, a supporting rod is connected to the weighing module, and a weighing tray used for containing materials is arranged at the upper end of the supporting rod; the weighing module is integrated at the bottom of the resonant cavity, so that microwave heating and real-time weighing are synchronously carried out, the technical problem that traditional microwave equipment cannot monitor material mass change is solved, and accurate data support is provided for reaction kinetics research; meanwhile, the resonant cavity adopts a split type design, and the furnace body is provided with a furnace cover and a bottom sealing plate, so that the weighing module is convenient to install and maintain.

A method for detecting a processing degree of wheat flour is provided, belonging to the technical field of analysis and detection. Thermogravimetric analysis of a wheat flour to be tested is conducted to obtain a pyrolysis characteristic curve, and then a correlation between characteristic values of a pyrolysis curve (including a pyrolysis residual mass fraction, a pyrolysis activation energy at 238° C. to 338° C., and a pyrolysis peak area at 290° C. to 320° C.) and key indicators of the processing degree of wheat flour (including ash content, bran speck content, and starch content) is established based on a pyrolysis kinetic equation and first derivative derivation. Weight values of three principal component indicators and their characteristic values are obtained by combining principal component analysis (PCA), such that a comprehensive evaluation function formula is constructed for the processing degree of wheat flour.

The invention provides a thermogravimetric adsorption characterization method and system combining dynamic working condition simulation and an accelerated aging test, and belongs to the technical field of adsorbents. According to the method, the temperature and atmosphere time sequence of a thermogravimetric analyzer is controlled through programming, and initial performance evaluation and long-term service life prediction of the adsorbent are completed in a continuous experiment. The core innovation of the method is that on the basis of simulating the real industrial adsorption-desorption cycle, thermal stress and chemical stress are intelligently applied in the desorption stage, material aging is accelerated, attenuation data are fitted by using an index model, and the service life is scientifically predicted. The technical problems that a traditional method is single in characterization dimension, long in period and disjointed with actual working conditions are solved, and an efficient and reliable platform is provided for rapid and accurate evaluation of the adsorbent.

To provide a composition capable of reducing odor while containing eggshell powder.SOLUTION: The resin composition contains egg shell powder and a polyolefin-based polymer. The eggshell powder contains calcium carbonate as a main component, and the eggshell powder has a weight loss of 0.80 mass% or less from 25 °C to 250 °C when thermogravimetric analysis is performed at a temperature rising rate of 20 °C / min under a nitrogen atmosphere.SELECTED DRAWING: Figure 1

The invention relates to the technical field of manufacturing of electrical insulating materials, and discloses a method for determining a softening breakdown test temperature of a 200-level direct-welding enameled winding wire, which comprises the following steps of: a) performing a softening breakdown test of preset temperature steps on an enameled wire sample, keeping the temperature of each step for a constant time, and recording the breakdown condition of the sample; b) counting the breakdown ratio at different temperatures, and determining a main breakdown temperature interval with the breakdown rate greater than or equal to 80%; c) adding a safety margin temperature to the lower limit temperature value of the main breakdown interval to obtain a softening breakdown test temperature; d) verifying by thermogravimetric analysis that the temperature of the cut-through test is at least 20 DEG C lower than the starting temperature of thermal decomposition of the material; 5 DEG C is used as a stepping step of the temperature step. Through stepped temperature rise, statistical analysis and thermal decomposition temperature verification, the softening breakdown test temperature of the enameled winding wire is accurately determined, and the accuracy and reliability of a test result are ensured.

The invention provides a machine-made sand mortar performance regulation and control method based on hydration kinetics, and relates to the technical field of building materials. The method comprises the following steps: preparing and testing machine-made sand with different stone powder contents, gradation and flaky particle contents, determining a standard mix proportion of mortar, and testing the macroscopic performance of the mortar; hydration kinetic parameters are extracted through a hydration heat test, and the content of chemically bound water is obtained through thermogravimetric analysis; establishing a quantitative relation among the machine-made sand parameters, the hydration kinetic parameters and the macroscopic performance by utilizing correlation analysis, and determining key control parameters; and a machine-made sand parameter regulation and control principle taking hydration kinetics as a core is formed. According to the method, the mix proportion design is guided from the microscopic hydration mechanism level, the trial mixing workload is remarkably reduced, and the scientificity and efficiency of the mix proportion design are improved.

The present invention relates to a particulate electroactive material consisting of a plurality of composite particles wherein the composite particles comprise: (a) a porous carbon skeleton comprising micropores and mesopores, the total volume of the micropores and mesopores being 0.5 to 1.5 cm3 / g; and (b) silicon located at least within the micropores of the porous carbon backbone in a defined amount relative to the volume of the micropores and mesopores. At least 20% by weight of the silicon is characterized as surface silicon by thermogravimetric analysis.

The invention discloses a porous carbon composite material prepared through pyrolysis and an application method of the porous carbon composite material in an electrode, and belongs to the technical field of porous carbon composites.The method comprises the following steps that pine sawdust is prepared, a small amount of pine sawdust powder is taken and subjected to thermogravimetric analysis testing in the nitrogen atmosphere, and a thermogravimetric curve and a differential curve of the pine sawdust powder are obtained; determining a temperature interval corresponding to a pyrolysis weightlessness peak; based on a thermogravimetric analysis result, a water-soluble phenolic resin solution and a phosphoric acid solution are blended and mixed, then pine sawdust powder is soaked in the mixed solution, full stirring and ultrasonic treatment are conducted to enable phosphoric acid molecules to be evenly loaded, then drying is conducted, and a pine sawdust precursor pretreated with phosphoric acid is obtained; the problems of pyrolysis conflict, agglomeration and the like in a traditional process are solved, the uniformity, the conductivity and the structural stability of the composite material are improved, the performance consistency of batches is ensured, and the method is suitable for being applied to supercapacitor electrodes.

The present invention provides a catalytic cracking catalyst that exhibits high activity even when containing carbon. [Solution] A catalytic cracking catalyst according to one aspect of the present invention contains zeolite and carbon. The zeolite contains hydrogen atoms, oxygen atoms, aluminum atoms, and silicon atoms, as well as atoms of one or more elements selected from alkali metal elements, alkaline earth metal elements, and transition metal elements, in a specific proportion. The weight loss of the catalytic cracking catalyst in thermogravimetric analysis is 0.01 to 1.5% by weight, based on the weight of the catalytic cracking catalyst.

The application discloses a MOFs synthesis route multi-objective optimization method based on machine learning. The method is to collect the synthesis conditions of prepared Ce-UiO-66, and evaluate the defect content and thermal stability thereof through a thermogravimetric analysis curve, as initial data set; the data set is randomly divided into a training set and a test set, eight algorithms are adopted to model each performance of Ce-UiO-66 and select the proxy model for performance prediction; the target achievement probability (PA) value of each performance in the synthesis space is calculated and expanded into a multi-objective evaluation factor; the Ce-UiO-66 material is prepared; the obtained material is subjected to characterization test, if the test data does not meet the requirement, the data set and the proxy model are updated. The application has the advantages of low cost, short cycle and the like in optimizing the catalytic and stable performances of MOFs based on reliable experimental data and machine learning, and can be popularized to the design of synthesis routes of other materials.

The present invention provides copper foil, an electrode containing the same, a secondary battery containing the same, and a method for manufacturing the same. [Solution] One embodiment of the present invention provides a copper foil comprising a copper film having a matte surface and a shiny surface, and a protective layer on the copper film, wherein the thermogravimetric coefficient is 1.1% or less. The thermogravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in an oxygen atmosphere at a rate of 10°C / min from 25°C to 800°C.

This disclosure provides a negative electrode, an electrochemical device, and an electronic device. The negative electrode includes: a current collector; and an active material layer located on the current collector; wherein the active material layer comprises a silicon-based material, and the minimum mass ratio of silicon element in the active material layer at different locations within the same area is X1, the maximum mass ratio is X2, and the value of X1 / X2 is M, where M ≥ 0.7; wherein the minimum weight loss ratio of the active material layer at different locations within the same area via thermogravimetric analysis (TG) at 800°C is Y1, the maximum weight loss ratio is Y2, and the value of Y1 / Y2 is N, where N ≥ 0.7. This disclosure improves the rate performance and cycle performance of the electrochemical device and reduces the expansion of the electrode assembly by uniformly dispersing the silicon-based material and binder in the active material layer.

This application provides a method for thermogravimetric analysis (TGA) of resin-based composite materials for aero-engine components, belonging to the field of composite material testing technology. The method includes: extracting the operating state points of the aero-engine components; simplifying the operating state points; determining statistical results of the component's operating temperature and operating time for the thermogravimetric analysis based on the simplified operating state points; conducting a preliminary thermogravimetric analysis based on the statistical results of the component's operating temperature and operating time; using the preliminary thermogravimetric analysis results as a benchmark, determining the thermogravimetric trend and the direction for conducting thermogravimetric analysis using a temperature gradient; determining the temperature threshold for thermogravimetric analysis based on the temperature gradient thermogravimetric analysis results; calculating the cumulative thermogravimetric rate of the composite material used in the aero-engine components over the entire engine lifespan by calculating the thermogravimetric rate at each operating temperature above the cumulative temperature threshold; and accelerating the thermal aging of a new test piece to the cumulative thermogravimetric rate to obtain performance loss results.

The invention belongs to the technical field of material analysis, and particularly discloses a sample detection device based on thermogravimetric-infrared combined analysis, which comprises a thermogravimetric analyzer for monitoring the mass change of a to-be-detected sample heated in a carrier gas atmosphere; the infrared spectrometer is used for carrying out structural component analysis on escape gas generated by heating the sample; the sleeve main body is arranged outside a heating furnace in the thermogravimetric analyzer in a sleeving manner, an annular channel is formed between the sleeve main body and the heating furnace, and carrier gas can flow along the annular channel so as to form an air curtain wrapping the heating furnace; the sleeve main body is configured to be matched with the heating furnaces with different outer diameters for use; and the gas conveying pipeline is communicated with the interior of the sleeve main body and a gas pool of the infrared spectrometer so as to convey mixed gas of carrier gas and escaping gas generated by heating a sample. Through the structural design, the infrared spectrum detection signal intensity can be effectively enhanced, and the sample detection accuracy is improved.

The present invention relates to a geopolymer produced from a synthetic aluminosilicate. The synthetic aluminosilicate was produced by sol gel technology, heat treated and, later, activated using sodium silicate and sodium hydroxide in solution, having as a final product a synthetic geopolymer. The final product was submitted to CO2 adsorption analysis using thermogravimetry for adsorbed quantification. In addition to the pure geopolymer, it is also possible to produce the synthetic geopolymer with the addition of surfactant, or in the composite form with the addition of zeolite, or heat treated to form a zeolite or functionalized with amine, for example, to increase the adsorption capacity.

A photosensitive resin film and application thereof are provided. When the photosensitive resin film is subjected to a thermogravimetric analysis under the conditions of heating at a rate of 5° C. / min from 40° C. to 200° C. and then keeping the temperature at 200° C. for 10 min, the absolute value of the first derivative of the weight percentage with respect to time within the range of 0 to 40 min is higher than 0.1% / min and not higher than 1.0% / min.