44 results about "Thermo gravimetric" patented technology

The invention provides a test method for blast furnace coke reactivity. According to the method, conventional equipment is utilized, by obtaining the weight loss rate variation of coke at different temperature and the initial temperature of the carbon solution loss reaction of coke, the reactivity of coke is characterized. The method comprises: grinding a selected to-be tested coke sample into fine powder, drying, taking out the coke sample, cooling to room temperature, sealing for usage; weighing the coke sample for usage, putting in a test apparatus, continuously raising the temperature, introducing a reaction gas CO2, when the heating terminal point is reached, finishing computer data acquisition, and storing the acquisition data; finally processing the data acquired by a computer; and finally characterizing the reactivity of coke by obtaining the weight loss rate variation of coke at different temperature and the initial temperature of the carbon solution loss reaction of coke. According to the method, test equipment such as a thermo gravimetric analyzer and the like are employed, the reaction situation of coke with CO2 at different temperature can be comprehensively analyzed, and true objective evaluation on the reactivity of cokes with different quality can be made.

The invention relates to a method for preparing benzene end-capping polyaryletherketone polymers, which belongs to the technical field of high polymer materials. The preparation method comprises the steps as follows: using 4-(p fluorophenyl acyl) biphenyl or 4-(p fluorophenyl acyl) phenyl ether as an end-capping agent, using 4,4'-difluorobenzophenone and a bisphenol monomer as reactants, and using a nucleophilic route to prepare the benzene end-capping polyaryletherketone polymers with glass transition temperature of 147 DEG C and initial thermo-gravimetric temperature above 540 DEG C. Two detailed chemical equations describing the preparation process are attached. With two end-capping monomers having boiling points above 320 DEG C and suitable process conditions, the method for preparing the benzene end-capping polyaryletherketone polymers solves the technical problem caused by the fact that the p fluorophenyl acyl has low boiling point and volatilizes in an end-capping reaction in the prior art, and synthetizes polyaryletherketone with a benzene oxygen end group and polyaryletherketone with a biphenyl end group, so as to meet the requirement of continuous industrial production.

The invention belongs to the field of materials and discloses a method for preparing a conductive glass (FTO)-loaded tungsten trioxide (WO3)/vanadium pentoxide (V2O5) composite photoelectrode (WO3/V2O5/FTO). The method comprises the following steps: adopting vanadyl acetylacetonate and ammonium tungstate as raw materials, polyvinylpyrrolidone (PVP) as an auxiliary material, and dimethylformamide (DMF) and oxalic acid solution as solvents; loading a composite precursor onto conductive glass according to an electrostatic spinning technology and finally carrying out high-temperature roasting to obtain a WO3/V2O5/FTO composite photoelectrode material with high photo-electro-catalytic activity. The material is characterized through scanning electron microscope (SEM), X-ray diffraction (XRD), thermo-gravimetric-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared ray spectroscopy (FT-IR) and other means, so that the fiber material obtained by the method disclosed by the invention can be discovered that the release is uniform, and the diameter is 100-150 nm. The WO3/V2O5/FTO composite photoelectrode material prepared by adopting the method disclosed by the invention is simple in process and has higher photocatalysis under visible light.

The invention discloses a phosphor and nitrogen containing flame retardant curing agent, a preparation method and application thereof. The curing agent has a phosphorylurea structure, contains active ammonia and hydrogen atoms, has dual functions of both a flame retarding agent and a curing agent, and can be directly used for curing epoxy resin. In a curing progress, flame retardant elements are embedded into an epoxy structure, thus avoiding phase separation phenomenon due to introduction of additive type flame retarding agent. Phosphor elements mainly function in flame retarding of a condensed phase while a urea structure mainly functions in flame retarding of a gas phase. The curing agent can react with common epoxy resin to obtain uniform and transparent cured object; in addition, the curing agent has low phosphorus content, passes 1.6 mm UL 94 V0 level, reaches oxygen index as high as 29-34%, and has excellent flame retardance; in thermo-gravimetric analysis, the maximum thermal decomposition temperature is as high as 400 DEG C; the char yield of the curing agent at 700 DEG C is 35%; and glass transition temperature of the curing agent is as high as 150 DEG C. The curing agent can also realize co-curing together with common curing agents, such as, diaminodiphenyl sulfone and anhydride-type epoxy curing agents. The curing agent is low in cost, simple in production process, and available for industrial production.

The invention belongs to the technical field of chemical testing and analyzing, and relates to a thermo gravimetric analysis method for graphene oxide .The thermo gravimetric analysis method includes the steps that 1, graphene oxide powder is sieved to be dried to be at the constant weight under the vacuum condition to serve as a sample ready for use; 2, the sample and a powder material are respectively put into a crucible, stirred and mixed, the powder material is formed in the mode that sodium chloride, alumina, quartz, strontium carbonate graphite and/or zirconium dioxide are doped, the mass ratio of the sample to the powder material is 1:0.1-1:100, and after the mixture is stirred to be even, the crucible and another empty crucible are put into a thermo-gravimetry analyzer at the same time; 3, thermo analysis software is started to conduct thermo gravimetric analysis, the heating rate is set to be 5 DEG C/min to 200 DEG C/min, the heating range is set to be at 25 DEG C to 800 DEG C, inert gas or air atmosphere is led to start testing, and therefore thermo gravimetric analysis of the graphene oxide is achieved .The thermo gravimetric analysis method is low in cost, simple in process, scientific in theory, easy to operate, small in required sample number, quick and accurate in testing process and free of pollution and waste.

A stable Crystalline Form II of non-solvate of Apremilast (Formula I), methods of making Form II, pharmaceutical compositions comprising Form II, and their uses are disclosed. Also discloses are mixed crystals comprising Form Hand Form B and methods of making the same. The crystalline forms are characterized using X-ray powder diffractometry (XRPD), infrared spectroscopy (IR), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TG). As compared with Forms A, B, C, D, E, F, and G reported in prior art references, Apremilast Form II of the present invention is more stable to temperature, light, and humidity, and is more suitable for long term storage; the crystallization solvents are safe and can be easily removed; the Form II has a white or off white appearance, and can be directly used in preparation processing; the preparation methods are simple and easy to reproduce, and are suitable for industrialized production.

The invention provides a method for preparing a PVC (Polyvinyl Chloride) heat stabilizing agent by using liquid-state Ca/Zn. The invention researches the influences on the heat stability of the PVC, caused by a mass ratio of calcium to zinc, a mass ratio of a phosphorous acid-phenyl diisooctyl phthalate to epoxy soybean oil (ESO) and hydrotalcite (LDHs), in a liquid calcium-zinc (liquid Ca/Zn) heat stabilizing agent through an overheating ageing oven method, a dynamic heat stability test and a Congo red method; and meanwhile, an ultraviolet and visible spectrophotometer and a thermo-gravimetric analyzer are used for detecting the influences of the LDHs to the transparency and the stability of the PVC.

The invention relates to a method for judging purity of silicon for a crystalline silicon solar battery, which comprises the steps of: a, weighing silicon samples with given weight, b, adopting gas shield at a certain flow (80-120mL/min) and allowing the silicon samples to be fused at a certain heating rate (3-100 DEG C/min) and in a certain temperature range (0-1500 DEG C) in a simultaneous differential scanning calorimeter-thermo gravimetric analyzer (SDT), c, regressing a linear relationship between purities and melting points according to at least three samples with known purities and correct melting point testing results of the samples based on testing conditions set in Steps a and b, and d, calculating the purity of unknown samples according to the linear relationship between the purities and the melting points for other samples with unknown purities as long as the melting points of the samples with unknown purities are measured. The method has the beneficial effects that: 1, the operation is automatic, the total cost is lower, and the quality control is facilitated, 2, the method is a physical method for directly measuring the changes in the melting points, and is scientific and reasonable, and 3, the measuring precision is high, and the stability is higher.

The present invention provides a desulfurized quicklime effective ingredient determination method, and the method is as follows: analysis and determination of kind and content of decomposable effective ingredients in a desulfurized quicklime sample, and element analysis of the undecomposed sample to determine the content of effective ingredients in the undecomposed sample so as to determine the content of effective ingredients in the desulfurized quicklime sample. By use of thermo-gravimetric and infrared spectroscopy coupled technology combining X-ray fluorescence spectrum, the content of the effective ingredients in the desulfurized quicklime can be determined, the method greatly reduces the artificial operation error, and can effectively distinguish the content of CaO, Ca (OH) 2 and CaCO3 in the desulfurized quicklime sample, and the results are accurate and reliable.

The invention belongs to the technical field of plastic machining forming and discloses a forming method for manufacturing a high-quality transparent piece based on a photonic crystal high-elastic state method. The forming method comprises the following steps that (1) materials are prepared; (2) machining conditions are obtained, specifically, the decomposition temperature of photonic crystals isobtained through thermogravimetry, and the glass-transition temperature and the viscous flow transition temperature of the materials are obtained through differential scanning calorimetry; (3) a mouldis prepared; (4) the materials are added in the mould; (5) heating is conducted, specifically, the photonic crystals are heated to enter into a high-elastic state, and heat preservation is conductedto guarantee that the photonic crystals are completely transformed into the high-elastic state; and (6) pressure maintaining and cooling are conducted, specifically, the pressure is increased to enable the photonic crystals to be combined mutually, then heating is stopped, the pressure is maintained, the photonic crystals are cooled with the mould to the indoor temperature, and accordingly the transparent piece is obtained. The macro orientation problem of the product due to the fact that molecular chains are distributed regularly because of shear flow and shrinkage of the materials is avoided, the product is in a uniform and regular periodic structure microcosmically, and the forming quality is good.

The invention relates to a method for judging the thermo-crosslinking process scope of a thermoplastic polymer, belonging to the field of new technology development. According to the method for judging the thermo-crosslinking process scope of the thermoplastic polymer, a thermo-gravimetric curve of the thermoplastic polymer or a weight variation curve of the thermoplastic polymer treated by meansof different thermo-crosslinking processes as well as an energy storage modulus curve or a loss factor curve related to dynamic thermal mechanical analysis of a thermo-crosslinking film are comprehensively analyzed, and the cross-linking process conditions of the optimum thermal cross-linking degree upper limit and the cross-linking process conditions of the optimal thermal cross-linking degree lower limit are judged, so that the optimal thermal cross-linking degree is determined. The method for judging the thermo-crosslinking process scope of the thermoplastic polymer can be used for simply,conveniently and visually judging the thermal cross-linking degree of the thermoplastic polymer, thus not only being capable of effectively regulating and optimizing the structure and performance of athermoplastic polymer-based carbon film, but also being applied to other fields, such as preparation of high toughness and high damage tolerance resin composite material matrix, of application of thecrosslinked thermoplastic polymer.

The invention discloses a method for establishing a metallurgical coke pore feature parameter prediction model. The method is characterized by comprising the steps of: 1) performing thermo-gravimetric analysis test on a single coal of more than 15 different coal ranks and a matching coal thereof to obtain a maximum volatile de-volatilization rate DTGmax (%/ min) of each sample; 2) performing Gieseler fluidity test on a coking coal to obtain a maximum Gieseler fluidity MF (graduation/ min) of each sample; 3) performing coking test on the coking coal samples, and obtaining the average pore size, porosity, proportion of pores smaller than 30 microns and proportion of pores greater than 150 microns of coke via an image analysis method; and 4) performing binary linear regression on the average pore size, porosity, proportion of pores smaller than 30 microns and proportion of pores greater than 150 microns of the coke respectively by using DTGmax and LgMF as independent variables to obtain a relation between the pore structure parameters and the DTGmax and LgMF. The prediction method is simple and convenient in test and high in prediction accuracy.

The invention relates to a novel method for evaluating asphalt four-component combustion dynamics based on a plurality of heating rates, belongs to the technical field of asphalt materials, and solvesthe problems that the temperature rise rate variability is difficult to simulate in actual fire disaster on the basis of a single heating rate, the reliability in calculation of the combustion dynamics parameters is poor, the thermal stability of all the components of the asphalt is difficult to objectively evaluate, and the asphalt combustion dynamics characteristic cannot be deeply evaluated. The method comprises the following steps of firstly, separating four components from asphalt, and carrying out industrial and element analysis respectively; carrying out thermo-gravimetric analysis inthe air, raising the temperature to 800 DEG C from the room temperature at three temperature rising rates, and obtaining a TG-DTG curve; dividing different combustion stages, and calculating dynamic parameters of different combustion stages by adopting a differential method and an integral method, and carrying out mutual checking; and finally, observing the microscopic morphology of the surface ofthe combustion residue, testing element components and contents, comparing the dynamic parameters of different combustion stages of the asphalt components, evaluating the four-component thermal stability of the asphalt, and disclosing the asphalt combustion characteristic from the component level.

The present disclosure relates to a cocrystal of telmisartan and hydrochlorothiazide, a preparation method and use thereof. In the cocrystal, the molar ratio of telmisartan and hydrochlorothiazide is 1:1. The cocrystal of telmisartan and hydrochlorothiazide was characterized by X-ray powder diffraction (XRPD), proton nuclear magnetic resonance spectra (1H-NMR), thermal gravimetric analysis (TG), scanning differential calorimetry (DSC) and infrared (IR) spectra, and it was found that the maximum plasma concentration of the cocrystal in SD rats was higher than that of any one of hydrochlorothiazide and telmisartan itself. The cocrystal of telmisartan and hydrochlorothiazide has a simple preparation method and good physical and chemical properties.

The invention discloses a formula of modified polyurethane. The formula comprises, by weight, 50 to 60 parts of iron tailings, 3 to 4 parts of sodium carbonate, 5 to 6 parts of calcium oxide, 2 to 3 parts of borax, 30 to 40 parts of quartz sand and 8 to 9 parts of alumina. A preparation method of the modified polyurethane comprises putting raw materials prepared according to the formula into a planetary ball mill, carrying out ball milling mixing for 1.5h, putting the mixture into a corundum crucible, heating the mixture to 1450-1500 DEG C in a muffle furnace at a heating rate of 5-6 DEG C/min, keeping the temperature of 1450-1500 DEG C for 3-4h, pouring a part of molten glass into water, carrying out water quenching, putting the other part of the molten glass into a mold preheated to 600DEG C, after molding and releasing, fast putting the model into the muffle furnace, carrying out annealing at 600 DEG C for 5h, grinding the glass subjected to water quenching to obtain powder of 74 microns, measuring a DSC curve through a thermal gravimetric analyzer, increasing the room temperature to 1000 DEG C, determining an endothermic valley and an exothermic peak, wherein the endothermic valley represents a glass transition temperature and the exothermic peak represents a crystallization temperature, determining the optimum nucleation temperature and the crystallization temperature ofthe microcrystalline glass according to the DSC curve and carrying out crystallization and nucleation.

The present invention relates to the technical field of chemical drugs and crystal form processes, and to a pyrroloquinoline quinine B crystal form and a preparation method therefor. The present invention comprehensively characterizes the pyrroloquinoline quinine B crystal form by virtue of means such as X-ray powder diffraction analysis, thermo-gravimetric analysis, and differential scanning calorimetry analysis so as to find the fact that the pyrroloquinoline quinine B crystal form is high in crystallinity and low in hygroscopicity, and a regular crystal form can be formed, thereby facilitating process treatment and improvement of physical and chemical properties of a medicine, and improving the patent medicine performance. The preparation method for the pyrroloquinoline quinone B crystal form provided in the present invention is simple, easy to control, and high in reproducibility.