77results about How to "Inhibition of hydrolysis reaction" patented technology

The invention relates to a low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature and a preparation method of the cable material. The method is characterized by comprising the steps as follows: firstly, a twin-screw mixing extruder is used for mixing polyolefin elastomers and linear low-density polyethylene with part of unsaturated silane and part of a grafting initiator respectively and extruding the mixtures into particles; then a high-speed mixer is used for mixing the two kinds of prepared particles with ethylene-vinyl acetate copolymer resin, functional polyolefin resin, a flame retardant, an antioxidant and a processing aid; and finally, the twin-screw mixing extruder is used for extruding the mixture into particles, so that the low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature is obtained. The cable material is high in silane grafting rate and high in crosslinking activity, crosslinking can be directly performed at the room temperature when the cable material is prepared into wires and cables, time-consuming and energy-consuming procedures such as water boiling, sauna and the like can be avoided, a crosslinking method is simple and easy to implement, and more than half of the crosslinking time can be saved even when a water boiling or steam sauna crosslinking method is adopted. The cable material is low in cost, high in production efficiency, easy to operate and free from structural limits when being used for producing the wires and the cables, and the product performance is stable and reliable after crosslinking.

The invention relates to a low-conductivity cooling liquid and a preparation method thereof, and belongs to the field of chemical engineering. The total mass of each component in a cooling liquid formula is 100%, and the low-conductivity cooling liquid is prepared from the components in percentage by mass: 30-80% of dihydric alcohol, 0.05-5.0% of organosilicon compound, 0.01-2.0% of nitrogen-containing compound, 0-1.0% of azole-based compound and the balance of deionized water. The organosilicon compound, the nitrogen-containing compound and the azole-based compound are uniformly mixed and then added into the dihydric alcohol for normal temperature stirring for more than 20min, and finally the deionized water is added for uniform mixing to obtain the low-conductivity cooling liquid. The low-conductivity cooling liquid has good effect of corrosion inhibition on a multi-metal system, has better storage and using stability, and can be used for cooling and heat exchanging of fuel cells, electric automobile motors and wind power generators.

The invention discloses a method for synthesizing a polyepoxysuecinic acid salt, which is characterized by comprising the following steps of: dissolving maleic anhydride in deionized water; adding a solution of sodium hydroxide at 30 to 60 DEG C with stirring; adding sodium tungstate and hydrogen peroxide when the temperature is controlled to be between 60 to 100 DEG C; adjusting the pH value to 5 to 7 for reaction for 2 to 100 hours; cooling the reaction solution to below 20 DEG C; adding a precipitator, mixing and stirring the precipitator and the solution; performing suction filtration, adding water into filtrate obtained after suction filtration; keeping the pH value between 6 and 7; heating the filtrate added with water to 70 to 100 DEG C to obtain an epoxysuecinic acid salt; preparing a 0.2 to 4.0 mol/L aqueous solution of the epoxysuecinic acid salt; adding calcium hydroxide and a polymerization promoter into the aqueous solution for performing polymerization reaction till liquid turns yellowish and pasty; and cooling the yellowish and pasty liquid to room temperature to obtain the polyepoxysuccinic acid salt. The method has the advantages of good product quality, low raw material cost and product scale inhibition performance advantageous over that of the prior art.

Disclosed is a bipolar membrane type direct borohydride fuel cell. The bipolar membrane type direct borohydride fuel cell comprises at least one cell unit; each cell unit consists of two layers of solid-state electrolyte membranes with ion selectivity transmission property; the solid-state electrolyte membranes are divided into two parts by the bipolar membrane; and the bipolar membrane adopts a three-layer structure which includes a cation exchange membrane layer, an anion exchange membrane layer and an intermediate interface layer positioned between the two exchange membrane layers. By adoption of the bipolar membrane type direct borohydride fuel cell, the negative electrode and the positive electrode can adopt non-uniform electrolytes, and a mixed potential caused by permeation of an intermediate product generated by the positive electrode fuel or the positive electrode to the negative electrode can be prevented; and meanwhile, permeation of a negative electrode product to the positive electrode also can be prevented, polarization loss of the electrode is lowered, the mixed potential is eliminated, and the fuel utilization rate and the output power are improved.

A technology for synthesizing dimethyl carbonate adopts a two-tower continuous reaction, and comprises the following steps: a raw material liquid methanol is fed from the upper part of a gas and liquid distributor of a first reactor, flows out of the gas and liquid distributor and enters the reaction section of a reactor, a raw material gas CO is introduced to the first reactor from the bottom ofthe reaction section of the reactor, O2 is divided into 2-5 passages, O2 in the 2-5 passages except one is distributed in the reaction section of the reactor, a reaction is continuously carried out under the action of a catalyst in the reaction section to generate dimethyl carbonate, a formed mixed liquid A flows into the water separation section of the first reactor, methanol and dimethyl carbonate in the mixed A go through a bottom hydrophobic membrane and continuously downwards flow into a tower bottom to form a mixed liquid B, water permeates a surrounding hydrophilic membrane, and then iscollected and discharged, the mixed liquid B in the bottom of the first reactor enters a second reactor, a crude product is extracted from the bottom of the second reactor, and non-condensable gasesCO, O2 and CO2 obtained after the reactions in the first reactor and the second reactor are discharged from the top of the reactors. The technology has the advantages of simple process, high methanolconversion rate and low energy consumption.

The invention belongs to the technical field of fine chemical production, and discloses a preparation method of dioctyl sodium sulfosuccinate. The preparation method mainly comprises the steps of an esterification stage: implementing alcoholysis reaction to isooctanol and maleic anhydride, adding a catalyst and a color fixative, implementing primary dual-esterification reaction at 115 DEG C, increasing temperature to 185-205 DEG C and carrying out reaction to generate diisooctyl maleate; and a sulfonation stage: implementing reflux reaction to diisooctyl maleate, sodium hydrogen sulfite and water, and removing residual isooctanol in a refluxing process to obtain dioctyl sodium sulfosuccinate. The preparation method disclosed by the invention is low in isooctanol addition, thus reducing raw material cost, and is free from vacuum reaction and isooctanol removal under high vacuum, so as to greatly reduce requirement on equipment; the isooctanol is removed in the sulfonation reaction, thus effectively reducing residue. The prepared dioctyl sodium sulfosuccinate is light in color, small in smell, good in wettability and low in isooctanol content.

The invention belongs to the technical field of lard oil processes and in particular relates to a method for making low-temperature refined pickled lard oil. The method comprises the following steps:selecting raw materials, trimming and cleaning, cutting into pieces, pickling, carrying out vacuum refining, separating oil from residues, filtering, filling, preserving, and the like, thereby obtaining a product. By adopting the method, the problems that in the prior art, lard oil is liable to deterioration in the production process and a product cannot be quantitatively added can be solved; withthe combination of pickling and vacuum refining, the acid value and the peroxide value of a pickled lard oil product can be remarkably reduced, the preservation time of the lard oil can be effectively prolonged, and meanwhile, quantitative packaging and addition of the pickled lard oil product can be achieved.

The invention provides a metal-free sulfur-doped carbon material hydrogen peroxide reduction catalyst and a preparation method. The preparation method is characterized by comprising the following steps: putting benzyl disulfide and a carbon material into sufficient ethanol according to a mass ratio of (5-6): (95-94), ultrasonically treating the mixture for 0.5 to 1 hour, centrifuging the mixture to remove the upper substances, vacuum drying the mixture for 5 to 6 hours at the temperature of 50 to 60 DEG C to form solid powder, putting the solid powder into a high-temperature furnace to be reacted for 7 to 8 hours at the temperature of 800 to 900 DEG C under the protection of nitrogen, cooling the solid powder to room temperature under the protection of nitrogen to obtain the sulfur-doped carbon material hydrogen peroxide reduction catalyst. The sulfur is used for substituting carbon to form S-C bonds to form an activity center of the electroreduction of H2O2. The source of the raw material is wide, and the price is low. Not only is the electrochemical activity high, but also the stability is high, and the toxicity resistance is high. The hydrolysis reaction of the H2O2 can be prevented, and the oxygen can be reduced. The electric oxidation performance and utilization rate of the H2O2 can be greatly improved.

The invention relates to a production method of a firming agent, and in particular relates to a production method of a sulfoacid firming agent for casting sand mold ink-jet printing resin. The production method is characterized by comprising the following steps: turning off a discharging valve at the bottom of a reaction kettle, starting a power supply, turning on a methylbenzene feeding valve, sequentially adding methylbenzene and anhydrous sodium sulfate, starting a stirrer, and meanwhile slowly adding concentrated sulfuric acid; after feeding materials, raising temperature and refluxing; preserving the reaction temperature and removing 10-25 parts of water, subsequently turning on a methylbenzene recovery valve, turning off a reflux valve, adding de-ionized water, and decreasing temperature when methylbenzene is recovered to 40-96 parts; when the temperature of material liquid is reduced to 70 DEG C, refilling the de-ionized water which is evaporated when evaporating methylbenzene; when the temperature of the material liquid is reduced to 40 DEG C, sampling and inspecting, and discharging materials after the materials are qualified. The method disclosed by the invention is unique, the corrosion of the firming agent can be remarkably weakened, the technological requirements of the firming agent for 3D resin are achieved, the rate of a sulfonation reaction is improved and a sulfurizing defect on casting surface is remarkably relieved.

The invention provides a stable olmesartan medoxomil solid preparation and a preparation method thereof. Olmesartan medoxomil is unstable within a certain pH range and is easy to undergo hydration reaction. The hydrolysis product as an impurity is retained in the medicine, thereby influencing the safety effectiveness of the medicine. A pH adjusting agent and a stabilizing agent are added in a prescription, active components of the preparation are ensured to be free from undergoing the hydration reaction in the production process, the impurities are avoided, and the quality of the products and the medicine application safety of patients can be ensured.

Based on physical and chemical principles of a freeze drying process, freeze drying conditions, namely freeze drying procedures and freeze drying protective agents, of the nucleic acid-lipid nanoparticles are systematically studied, and an efficient freeze drying method suitable for the nucleic acid-lipid nanoparticles is preferably designed. According to the method, the total time of a nucleic acid-lipid nanoparticle freeze-drying process can be shortened to 8-18 hours, the energy consumption and the time cost of product amplified production are remarkably reduced, the freeze-dried nucleic acid-lipid nanoparticles are rapid in rehydration (within 10 seconds) and high in nucleic acid total amount, entrapment efficiency and nucleic acid integrity, and in addition, the freeze-dried nucleic acid-lipid nanoparticles have good application prospects. The cell transfection efficiency of the freeze-dried and rehydrated preparation is not significantly different from that of an unfreeze-dried nucleic acid-lipid nanoparticle stock solution, and the in-vivo immune response is high and even exceeds that of the unfreeze-dried nucleic acid-lipid nanoparticle stock solution.

The invention provides a catkin hollow carbonization tube composite precious metal fuel-cell catalyst and a preparation method of a catkin hollow carbonization tube. The preparation method of the catkin hollow carbonization tube comprises the steps of: adding catkins to acetone, and carrying out ultrasonic treatment; violently stirring and washing by using distilled water; carrying out vacuum drying; adding the treated catkins to a potassium hydroxide solution, grinding into powder after drying by distillation, feeding the powder into a tubular furnace, heating, then naturally cooling after heat preservation to obtain the catkin hollow carbonization tube. The catkin hollow carbonization tube is put in precious metal solution-containing electrodeposition liquid and subjected to electrolytic deposition so as to obtain the catkin hollow carbonization tube composite precious metal fuel-cell catalyst. The catkin hollow carbonization tube composite precious metal fuel-cell catalyst can inhibit the hydrolysis reaction of an oxidizing agent and fuels and reduce the generation of gases. Lots of voids exist on the tube wall of the catkin hollow carbonization tube and can provide channels for electrolyte, and electrochemical reactions happen through catalysis of precious metals. Oxygen generated through hydrolysis can be sealed in the catkin hollow carbonization tube, reacts continuously and does not release O2, and the electrochemical property and utilization rate of an oxidizing agent and fuels are greatly increased.

The invention discloses a novel method for terminating allyl alcohol irregular polyether methyl. The novel method comprises the following steps of: adding allyl alcohol irregular polyether raw materials through a material inlet in a jetting loop reactor based on Venturi effect, deoxidizing and introducing inert gases for replacement and protection, and starting an external circulating pump to carry out high-speed jetting mixing; and at a control temperature ranging from 20 DEG C to 70 DEG C, slowly adding a methane chloride raw material and an alkali raw material into the jetting loop reactor through a methane chloride raw material feeding hole and a material feeding hole separately, and the like. According to the novel method disclosed by the invention, this system belongs to a dynamic control system, side reactions are restrained sufficiently, a low-temperature method is further adopted to carry out dynamic reaction control according to the characteristic that activation energy of side reactions is high, hydrolysis reaction of methane chloride is restrained, and isomerization reaction of allyl is further restrained, and therefore, selectivity of a reaction system is higher. Finally obtained allyl alcohol irregular polyether methyl terminated product has color and luster smaller than 30, and has a terminating rate greater than 98%.

The invention discloses a modified carbon nano tube material and a preparation method and application thereof. The modified carbon nano tube material comprises a carbon nano tube, the surface of the carbon nano tube is modified with ethylenediamine tetraacetic acid, and the mass content of carboxyl in the modified carbon nano tube is 3%-5%. The preparation method comprises the steps that oxidationtreatment is conducted on the carbon nano tube; an activated carbon nano tube intermediate is prepared; an activated ethylenediamine tetraacetic acid intermediate is prepared; the activated carbon nano tube intermediate is mixed with the activated ethylenediamine tetraacetic acid intermediate, and diethylenetriamine is added for preparing the modified carbon nano tube material. The modified carbon nano tube material has the advantages that the technology is simple, operation is easy, the reaction condition is mild and easy to control, the cost is low, less energy is consumed, and less time isconsumed. The modified material can stabilize refractory organic matter and heavy metal in bottom mud, the stabilization effect is significant, and the modified carbon nano tube material has a wide application prospect.

The invention relates to the technical field of bromine-containing hazardous waste treatment, and particularly discloses a recycling method for recycling brominated aromatic hydrocarbon-containing hazardous waste. The method comprises the following steps: (1) pretreatment: separating inorganic bromine from organic bromine in the waste to obtain an upper-layer alkali washing liquid and a lower-layer waste liquid; (2) hydrolysis: controlling the temperature at 300-400 DEG C and the pressure at 20-30 MPa, adding a sodium hydroxide aqueous solution with the concentration of 20-30% into the lower-layer waste liquid in the step (1), and carrying out hydrolysis reaction; (3) separating; and (4) purifying to obtain a sodium bromide product. According to the method, the recycling rate of sodium bromide can reach 95% or above, the purity meets the first-grade product standard, the hydrolysis reaction time is greatly shortened, and the treatment efficiency is improved; and the waste liquid is prevented from being directly incinerated to generate a large amount of acid gas such as hydrogen bromide, corrosion to treatment equipment is reduced, and harmless and resourceful bromine treatment and recovery of the brominated aromatic hydrocarbon-containing hazardous waste are achieved.

In a composition including polyrotaxane and a utilization object thereof, the water molecules are difficult to mix, thereby suppressing the generation of a hydrolysis reaction, and improving the wet resistance. The composition including polyrotaxane comprises a polyrotaxane (A) which includes cyclodextrin as a ring molecule and polyethylene glycol as a linear molecule, and in which a blocking group is arranged at both ends of the linear molecule; a block copolymer (B) including polysiloxane; and a polymer (C) including no polysiloxane. In a curing body formed by the composition, a plurality of annular molecules of the polyrotaxane are combined by a crosslinking part, at least a part of the crosslinking part is the block copolymer (B) having the polysiloxane. A dielectric medium attached with an electrode layer uses a curing film formed by the curing body as the dielectric medium, and electrode layers are attached to the two surfaces of the curing film respectively. An actuator uses the dielectric medium attached with the electrode layers.