38results about How to "Overcome the disadvantage of poor stability" patented technology

The invention relates to a ternary doping modified SPEKK proton exchange membrane and a preparation method thereof. The exchange membrane comprises the following components by mass percent: 80-98.5% of SPEEK with 40%-80% of sulfonation degree and 1.5-20% of ternary adulterant. The preparation method comprises the following steps: 1, adopting the SPEEK with medium sulfonation degree as a matrix material so as to overcome the over high water absorption and poor stability of the composite membrane of the SPEEK with over high sulfonation degree, and ensure that the composite membrane has a certain water absorption; 2, adopting a three ternary doping mode of ion liquid, rare-earth oxide yttrium oxide and phosphotungstic acid so as to enable the SPEEK substrate to act with the dopant materials so as to improve the combination property of the composite membrane; and 3, by the process of high temperature high-intensity magnetic field, enabling the dopant materials to be orientated under the action of a magnetic field to form a proton conduction passage to improve the proton conduction rate of the composite membrane.

The invention discloses a lignin dispersant for phenol-water coal water slurry, and a preparation method and application thereof. The preparation method comprises the following steps: adding a sulfonating agent into an alkaline alkali lignin solution, then adding formaldehyde, and reacting to obtain hydroxymethyl sulfonated alkali lignin; dissolving phosphate in water, adding epoxy chloropropane, and reacting to obtain a hydroxypropyl phosphate compound; and mixing the hydroxymethyl sulfonated alkali lignin and the hydroxypropyl phosphate compound, adding a condensing agent to perform condensation reaction, and then adding surfactant to obtain the lignin dispersant for phenol-water coal water slurry. The molecule of the lignin dispersant contains multiple hydrophilic functional groups such as sulfonic groups, phosphate groups and the like, so that the lignin dispersant has favorable dispersion/viscosity reduction capacity and stability for phenol-water coal water slurry in case of low consumption. The dispersion/viscosity reduction capacity of the lignin dispersant is far higher than that of the traditional lignosulfonate coal water slurry dispersant; and the dispersion stability of the prepared phenol-water coal water slurry is better in comparison with a naphthalene dispersant.

The invention relates to a sulfonated polyphosphazene/polyetheretherketone proton exchange membrane material and a preparation method thereof. The proton exchange membrane material takes moderately sulfonated polyetheretherketone as a base material to overcome defects of poor composite membrane stability and overhigh water absorption rate of highly sulfonated SPEEK (sulfonated polyetheretherketone), and mechanical strength and great alcohol inhibition performance of a composite membrane are guaranteed. Due to addition of a phosphonitrile three-membered ring structure, heat stability and oxidation resistance of a sulfonated polyetheretherketone membrane material are improved; due to addition of aromatic amino benzene rings as hydrophobic groups, alcohol inhibition performance is further improved, and water swelling effects are reduced; by addition of a great quantity of sulfonic acid groups through chemical bonds, proton conduction rate of the proton exchange membrane is increased, physical loss of the sulfonic acid groups is avoided, and the service life of the membrane is prolonged. The sulfonated polyphosphazene/polyetheretherketone proton exchange membrane material and the preparation method thereof have advantages of low preparation cost, high conductivity, great alcohol inhibition performance and high heat resistance.

The invention provides a graphene ultrafiltration membrane and a preparation method thereof. The method comprises the following steps: subjecting graphene oxide to ultrasonic dispersion in water so asto obtain a graphene oxide dispersion, then adding 50 wt% hydrazine hydrate and 28 wt% of ammonia water into the graphene oxide dispersion, and carrying out a reaction so as to obtain a partially-reduced graphene oxide solution; placing a cadmium nitrate tetrahydrate aqueous solution and a hexamethylenetetramine aqueous solution into a high-temperature reaction vessel, and carrying out a reactionso as to obtain cadmium hydroxide nanowires; and dispersing the obtained cadmium hydroxide nanowires into water so as to obtain a cadmium hydroxide nanowire solution, uniformly mixing the cadmium hydroxide nanowire solution with the partially-reduced graphene oxide solution so as to obtain a reaction mixed solution B, and subjecting the reaction mixed solution B to vacuum filtration on a polymerporous microfiltration membrane so as to obtain the graphene ultrafiltration membrane. The graphene ultrafiltration membrane prepared by using the preparation method provided by the invention has thefollowing advantages: a linear water flowing channel is formed between membrane layers, so the interception rate of the graphene ultrafiltration membrane is increased; organic pollutants can be effectively intercepted; and high water flux is achieved.

The invention relates to a sesquiterpene lactone (1 beta, 10 beta-epoxy-13-alpha-dimethylamino-1,2-propanediol 3-(4)-alkene-6,12-lactone) dimethylamine hydrochloride freeze-drying preparation for injection and a preparation method for the sesquiterpene lactone (1 beta, 10 beta-epoxy-13-alpha-dimethylamino-1,2-propanediol 3-(4)-alkene-6,12-lactone) dimethylamine hydrochloride freeze-drying preparation. The freeze-drying preparation contains sesquiterpene lactone (1 beta, 10 beta-epoxy-13-alpha-dimethylamino-1,2-propanediol 3-(4)-alkene-6,12-lactone) dimethylamine hydrochloride and a pH regulator; and the pH value before freeze-drying is 5.0 to 6.0. Compared with the prior art, the sesquiterpene lactone (1 beta, 10 beta-epoxy-13-alpha-dimethylamino-1,2-propanediol 3-(4)-alkene-6,12-lactone) dimethylamine hydrochloride freeze-drying preparation which is prepared by the method according to a prescription and used for the injection has the advantages that the content of relative substances is reduced obviously, and stability is improved.

The invention discloses a modified polyurethane soap-free emulsion for leather finish. The modified polyurethane soap-free emulsion comprises components as follows: 20-30 parts of a waterborne polyurethane emulsion, 3-6 parts of a K2S208 initiator, 10-20 parts of 3-allyloxy-2-hydroxypropyl sodium iodate, 25-35 parts of water soluble epoxy resin and 20-28 parts of polyacrylamide, wherein the waterborne polyurethane emulsion is prepared with an ultrasonic dispersion method. The invention further discloses a preparation method of the modified polyurethane soap-free emulsion for leather finish. The preparation method comprises steps as follows: (1), preparation of the waterborne polyurethane emulsion; (2), preparation of the modified polyurethane soap-free emulsion. The product provided by the invention is environment-friendly, has high solid content, good film forming property, excellent coating compactness and wear resistance and high emulsion stability, and is suitable for a leather finishing agent, the preparation method of the modified polyurethane soap-free emulsion has low cost, the process is reasonable, and large-scale production can be facilitated.

The invention discloses a super-hydrophilic low-molecular-weight intercepted graphene composite ultrafiltration membrane and a manufacturing method of the super-hydrophilic low-molecular-weight intercepted graphene composite ultrafiltration membrane. The composite ultrafiltration membrane comprises graphene oxide, a polysulfone ultrafiltration membrane prepared by blending the graphene oxide, aminated titanium dioxide nanoparticles implanted into the surface of a polysulfone ultrafiltration pore channel, N-methylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylidene fluoride, hydrazine hydrate and ammonia water. Compared with an ultrafiltration membrane without doped graphene, the ultrafiltration membrane with higher mass fraction of doped graphene has better mechanical property and swelling resistance, high tensile strength, large water flux and high bovine serum albumin rejection rate, the interaction between organic frameworks is enhanced, the mechanical strength of the organic frameworks is greatly enhanced, the mechanical property of the prepared ultrafiltration membrane is obviously improved, the solvent resistance of the membrane is greatly enhanced, and a remarkable technical effect is achieved.

The invention relates to a ternary doped and modified sulfonate polyphenylene sulfide proton exchange membrane and a method for preparing the ternary doped and modified sulfonate polyphenylene sulfide proton exchange membrane. The proton exchange membrane comprises, by weight, 75-98.5% of sulfonate polyphenylene sulfide with the sulfonation degree ranging from 57% to 80% and 1.5-25% of ternary doped phases. Due to the fact that SPPS with the high sulfonation degree serves as base materials, the defects that the SPPS with the ultrahigh sulfonation degree is ultrahigh in water absorption and a composite membrane is poor in stability are overcome, and the certain water absorption of the composite membrane is guaranteed; due to the adoption of a rare-earth oxide nanometer yttria, phosphotungstic acid and polyphosphazene ramification ternary doping mode, the SPPS base materials and the doped materials react to improve comprehensive performance of the composite membrane.

The invention discloses a multi-layer sleeve spanner capable of being rotationally unfolded at 360 degrees and a working method. Various spanners used for fastening or removing hexagon bolts at present are mainly divided into two large kinds, namely opening adjustable spanners and torque spanners. Both the two kinds of spanners have advantages and disadvantages, the opening adjustable spanners canoperate bolts with more specifications, however being likely to slide and poor in stability, the torque spanners are good in stability, however being small in using range, and one torque spanner onlycan operate bolts with one or two specifications. The multi-layer sleeve spanner comprises a center hoop (1) and a stress hoop (3), and multiple adjusting hoops (2) are arranged between the center hoop and the stress hoop in sequence in a sleeving mode. The center hoop and the corresponding adjusting hoop are matched, every two adjacent adjusting hoops are matched, and the corresponding adjustinghoop and the stress hoop are matched. The center hoop is connected with the corresponding adjusting hoop through a fixing shaft (4), the multiple adjusting hoops are connected trough the fixing shaft(4), and the corresponding adjusting hoop is connected with the stress hoop through the fixing shaft (4). The multi-layer sleeve spanner is capable of being rotationally unfolded at 360 degrees.

The invention relates to bromothalonil missible oil and a preparation method thereof, and belongs to the technical field of chemical engineering. The bromothalonil missible oil is composed of the following components in percentage by weight: 1-45% of bromothalonil raw reagent, 1-15% of ethanol, 10-30% of an emulsifier, 1-5% of a synergist and the balance of biodiesel. The preparation method comprises the following steps: fully stirring the ethanol, the biodiesel and the bromothalonil raw reagent in a stirrer until the raw reagent is completely dissolved, then adding the emulsifier and the synergist, feeding the mixture into a homogenizing machine, carrying out heating to 55 DEG C, carrying out stirring at a constant temperature for 45 minutes to obtain a uniform transparent oily liquid, standing the liquid at a high position for 4-6 hours, and carrying out filling to obtain the bromothalonil missible oil. The biodiesel is a renewable energy source and has good biodegradability; and solubility of the bromothalonil raw reagent in the biodiesel is increased by adjusting the ratio of the ethanol to the bromothalonil raw reagent, and the defect that stability of a preparation is poor isovercome by compatibility with the specific emulsifier; and the synergist is added, so that penetrability of the bromothalonil missible oil is enhanced, rainwater washing resistance is improved, themetabolism speed of the bromothalonil missible oil in prevention and treatment objects is delayed, and therefore, the biological prevention effect is improved. The bromothalonil missible oil preparedby using the formula and the method disclosed by the invention is low in toxicity, is environmentally friendly, and has good social and ecological benefits.

The invention relates to a crop yield estimation method and device, electronic equipment and a storage medium, and the method comprises the steps of determining a key time phase of a remote sensing image based on a key phenological period of a to-be-estimated crop; acquiring a remote sensing image of the key time phase, and calculating a plurality of vegetation indexes; respectively constructing a regression model of each vegetation index and the actually measured yield data; sorting the goodness of fit of the regression model of each vegetation index and the actually measured yield data in the same growth period, and screening out the optimal vegetation index of the key time phase; and constructing a yield estimation model based on the optimal vegetation index of the key time phase and the actually measured yield data, and estimating the yield of the crops. The regional crop yield estimation model is constructed on the basis of remote sensing data, in combination with crop growth characteristics, through crop key phenological period analysis, in combination with optimal vegetation indexes and actually measured data, the method can be used for rapid regional yield estimation, and the reliability of a yield estimation result is improved.