381 results about "Thermogravimetric analysis" patented technology

The invention provides a silicone rubber aging test method and device, electronic equipment and a storage medium, and relates to the technical field of silicone rubber. The silicone rubber aging test method comprises the following steps: according to a preset actual application environment of target silicone rubber, determining cycle test parameters of preset aging factors corresponding to the actual application environment; determining an acceleration factor of the aging test according to the cycle test parameters and a preset calculation mode; performing thermogravimetric analysis on the target silicone rubber according to the cycle test parameters to determine mass loss parameters of the target silicone rubber; and determining an aging test result according to the elongation at break, the acceleration factor and the mass loss parameter of the target silicone rubber. According to the method, the aging performance of the target silicone rubber is integrally and comprehensively evaluated by combining multiple indexes such as the elongation at break, the acceleration factor and the quality loss parameter, and the test efficiency is improved.

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.

The invention relates to a method for evaluating the cyclic adsorption performance of a carbon dioxide adsorbent, which comprises the following steps: S1, performing multiple adsorption and desorption tests on a to-be-tested adsorbent after impurity removal treatment in a thermogravimetric analyzer to obtain a thermogravimetric cycle curve; s2, parameters E1, F1, Hi and Ii are obtained according to the thermogravimetric cycle curve and a formula; s3, obtaining a first fitting curve and a second fitting curve; s4, evaluating the performance of the adsorbent to be tested according to one or more of E1, Ei, H2, I2, F1, Fi, the first fitting curve function and the second fitting curve function. By adopting the method, a relatively standard evaluation method for evaluating the performance of the adsorbent based on the thermogravimetric analysis test can be established, a plurality of adsorbents can be qualitatively analyzed by selecting proper parameters according to actual use conditions, proper adsorbents are selected by comparing qualitative analysis results, and the method is wide in use range and high in applicability.

The negative electrode material comprises a core body and a coating layer coating at least part of the surface of the core body, the core body comprises a base body and an active substance arranged on the base body, the protection strength of the coating layer is defined as gamma, gamma = 0.0129 T0-0.323, gamma is greater than or equal to 4 and less than or equal to 9, T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis, T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis, and T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis. The thermogravimetric analysis comprises the step of determining the quality of the negative electrode material in an oxygen atmosphere; the negative electrode material further comprises an oxygen element, the atomic percent content of the oxygen element at any position, away from the interior of the negative electrode material by X, of the surface of the negative electrode material is defined as Px, X is larger than or equal to 60 nm and smaller than or equal to 160 nm, and Px is larger than or equal to 2 and smaller than or equal to 8.

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 discloses an analysis and detection method and application of the formula content of a negative electrode material, and the analysis and detection method comprises the following steps: taking part of the negative electrode material, and carrying out first thermogravimetric analysis to obtain a first weight loss ratio; removing the water-based dispersing agent from the residual negative electrode material to obtain a negative electrode material without the water-based dispersing agent; performing second thermogravimetric analysis on the negative electrode material without the aqueous dispersant to obtain a second weight loss ratio; respectively carrying out third thermogravimetric analysis and fourth thermogravimetric analysis on respective standard substances of the aqueous binder and the aqueous dispersant to obtain a third weight loss ratio and a fourth weight loss ratio; the product of the ratio of the second weight loss ratio to the third weight loss ratio and 100% is used as the mass content of the aqueous binder in the negative electrode material. According to the analysis and detection method for the formula content of the negative electrode material, the removal effect of the aqueous dispersant can be detected through the TG curve, and the reliability and the accuracy of the analysis and detection result of the content of the binder and the like are high.

The invention relates to a crystal form I, a crystal form II, a crystal form III, a crystal form IV and a crystal form V of (S)-indobufen sodium salt as well as a preparation method and application of the crystal form I. The five crystal forms of the (S)-indobufen sodium salt are comprehensively characterized by X-ray diffraction, differential scanning calorimetry and thermogravimetric analysis. The (S)-indobufen sodium salt crystal form provided by the invention is stable in quality and easy to store, and can be used for preparation production. The preparation method is simple to operate, safe, environment-friendly, low in cost and suitable for industrial production.

The invention relates to the technical field of coating testing, in particular to a water-based coating and a testing method thereof. The method comprises the following steps: carrying out coating sample pretreatment on a to-be-tested coating to obtain a pretreated coating sample; performing coating thermogravimetric analysis on the pretreated coating sample to obtain a thermogravimetric curve; performing initial division of weight loss intervals according to the thermogravimetric curve to obtain an initial weight loss interval list; performing weightlessness interval division correction on the initial weightlessness interval list to obtain weightlessness interval division correction data; performing weightlessness interval visualization on the thermogravimetric curve according to the weightlessness interval division correction data to obtain weightlessness interval division result data; and carrying out sample thermogravimetric-infrared testing on the pretreated coating sample to obtain a time-resolved infrared spectrum sequence. Through fine analysis of the thermal stability of the coating, the relevance between the thermal decomposition mechanism and the performance of the coating is disclosed, and an important technical support is provided for research, development, production and application of the coating.

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 provides a thermogravimetric analysis device and method for microwave-assisted carbon dioxide capture. The thermogravimetric analysis device comprises a gas conveying and switching unit, a microwave-assisted reaction unit, a temperature measuring unit, a weight recording unit and a gas analysis unit. According to the thermogravimetric analysis device, mass transfer and heat transfer are more sufficient, microwaves can act on samples in a concentrated mode, the adsorption and desorption efficiency is higher, and gas leakage and microwave leakage can be effectively avoided. According to the thermogravimetric analysis device, effective combination of a microwave heating system and a thermogravimetric analysis system is achieved, the adsorption and desorption capacity of a sample to carbon dioxide can be measured in real time, weight measurement data are more accurate, and the adsorption and desorption conditions of the carbon dioxide can be reflected more comprehensively and visually. The thermogravimetric analysis method for microwave-assisted carbon dioxide capture is carried out in the thermogravimetric analysis device, the method is high in repeatability, and the cyclic stability of adsorption-desorption of carbon dioxide is good.

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 provides a method for identifying mixed coal of coking coals, which comprises the following steps of: performing thermogravimetric analysis test on the coking coals with different metamorphic degrees to obtain test data; establishing a reference curve according to the test data; carrying out thermogravimetric analysis test on the coking coal to be detected to obtain data to be detected; constructing a differential thermal analysis curve according to the to-be-detected data; and obtaining an identification result through a comparison result of the differential thermal analysis curve and the reference curve. According to the method, data comparison is carried out through thermogravimetric analysis testing, the accuracy of coking coal identification is improved, the traditional identification process is simplified, and the cost is reduced.

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 present disclosure relates to the field of batteries, and particularly to a positive electrode sheet and a battery comprising the positive electrode sheet. The positive electrode sheet comprises a positive current collector and a positive coating on at least one side surface of the positive current collector, wherein the positive coating comprises a positive active material, a binder and a conductive agent, the conductive agent comprising a first conductive agent and a second conductive agent. A thermogravimetric analysis test curve of the positive electrode sheet comprises at least three weight-loss intervals at 150-600℃, the first weight-loss interval being within 150℃ to 350℃, and the second weight-loss interval and the third weight-loss interval being within 350℃ to 600℃; and the weight-loss percentage of the first weight-loss interval being m1, and the sum of the weight-loss percentage of the second weight-loss interval and the weight-loss percentage of the third weight-loss interval being m2, wherein 0.5％≤m1≤3％, 0.5％≤m2≤5％, and 0.1≤m1 / m2≤4. The positive electrode sheet has a good high-temperature performance and a good high-temperature cycle performance in a high-voltage (the cut-off voltage≥4.45V) system.

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 present application provides a battery and an electronic device. A first aspect of the present application provides a battery, comprising an electrolyte, wherein thermogravimetric analysis is carried out on the electrolyte at a heating speed of 5°C / min in a nitrogen atmosphere, and the electrolyte has at least one weight loss peak between 100°C and 600°C. The battery provided by the present application has good thermal stability, and the ARC thermal runaway time of the battery can be effectively prolonged, thereby improving the safety and cycle performance of the battery.

A flux consisting of, (i) 30 to 80 wt. % of one or more acidic resins, (ii) 10 to 60 wt. % of at least one organic solvent, (iii) 0 to 15 wt. % of one or more amines, and (iv) 0 to 20 wt. % of one or more components other than components (i) to (iii), wherein the flux undergoes a weight loss of ≥50 wt. % upon reaching a temperature of 280° C. during a thermogravimetric analysis carried out in the range from 25 to 350° C. at a heating rate of 10 K / min and with the addition of synthetic air; and solder paste consisting of 80 to 92 wt. % of one or more different solders and 8 to 20 wt. % of the flux.

A battery and an electronic device are provided. The battery comprises a positive pole piece, wherein the positive pole piece comprises a positive current collector and a positive active material layer arranged on the surface of the positive current collector; thermogravimetric analysis is carried out on the positive electrode active material layer at a heating rate of 5 DEG C / min in an oxygen atmosphere, and the positive electrode active material layer has at least one weightlessness peak between 100 DEG C and 600 DEG C. The problem of voltage attenuation of the battery in the furnace temperature testing process can be avoided, the risk of high-temperature intermittent cycle failure of the battery is reduced, and the service life of the battery is prolonged.

To provide a fibrous carbon nanostructure that can be easily surface-modified.SOLUTION: A fibrous carbon nanostructure of the present invention has a symmetry factor of 3.70 or less for a peak of a first derivative curve of a thermogravimetric curve obtained by thermogravimetric analysis under a dry air atmosphere. The first derivative curve of the thermogravimetric curve can be a temperature derivative curve of the thermogravimetric curve or a time derivative curve of the thermogravimetric curve.SELECTED DRAWING: Figure 2

The invention relates to an ardealite-based phase change energy storage wallboard as well as a preparation method and application of the ardealite-based phase change energy storage wallboard. LA-HD-PA and DME shape-stabilized phase-change materials are mixed according to different proportions (wherein LA-HD-PA is compounded with modified DME by adopting a vacuum adsorption method, stable combination of LA-HD-PA and DME is ensured, the mass ratio of LA-HD-PA to MDE is 45: 55, the materials are doped into phosphogypsum, and the materials are mixed with cement, fly ash and other building materials to prepare the phase-change energy-storage gypsum board. The microstructure, the mechanical property, the thermophysical property, the heat-conducting property and the thermal stability of the energy storage gypsum board under the condition of different mass fractions of phase change admixtures are analyzed through a scanning electron microscope, a differential scanning calorimeter, a heat conductivity coefficient tester and a thermogravimetric analyzer; and the heat storage and release capability and the temperature control effect of the lower phase change wallboard are evaluated through a self-made micro-room model.

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 present invention discloses a polyporus badius polysaccharide and its preparation method and application, belonging to the technical field of polysaccharide extraction. The polyporus badius polysaccharide (PPP-0A) includes galactose, fucose, glucose, mannose and xylose, and the molar ratios are 62.26%, 16.96%, 15.23%, 4.68% and 0.87% respectively. The present invention uses techniques such as methylation, scanning electron microscopy, thermogravimetric analysis, nuclear magnetic resonance and atomic force microscopy to determine the structural characteristics of PPP-0A, analyze its composition and properties, and its inhibitory effects on the activities of α-glucosidase and α-amylase. In addition, an in vitro HepG2 cell model induced by high blood glucose and high insulin levels was used to study the hypoglycemic effect of PPP-0A. The present invention provides a theoretical basis for clarifying the relationship between the hypoglycemic activity of PPP-0A and its hypoglycemic effect on type 2 diabetic mice.

The invention relates to a method for analyzing the adsorption efficiency of a dispersing agent in oily color paste, which quantitatively analyzes the adsorption efficiency of the dispersing agent in the color paste on the surface of a pigment through the weight loss rate difference of the pigment and the dispersing agent in the color paste in a thermogravimetric analysis test, is simple to operate, does not need a complicated sample pretreatment process, and has lower instrument cost. The method is universal to water-based color paste and resin-free color paste, and can be widely applied to the technical field of color paste analysis.