67 results about "Barium hydroxide" patented technology

The invention belongs to the technical field of hot melt adhesive processing, and particularly relates to a quick-drying polyurethane hot melt adhesive and a preparation method thereof. The preparation method comprises the following steps: mixing polyether polyol, isocyanate, a chain extender A, a chain extender B, a crystallization promoting agent, a surface drying promoting agent and an auxiliary agent, and carrying out extrusion granulation, wherein the chain extender A is obtained by carrying out a reaction on acrylamide and diethanol amine and then carrying out siloxane modification on the reaction product by utilizing methacryloyloxymethyltrimethoxysilane; and the chain extender B is obtained by reacting tetrakis hydroxymethyl phosphonium sulfate and barium hydroxide octahydrate and oxidizing by hydrogen peroxide. The prepared hot melt adhesive has better viscosity and also has a certain flame-retardant effect.

The invention discloses a steel casting heat treatment process which comprises the following steps: step 1, heating a steel casting to a complete austenitizing temperature (30-50 DEG C above Ac3), and preserving heat; secondly, the austenitized steel casting is discharged out of the furnace, an aqueous solution quenching mode is adopted, the steel casting is rapidly cooled, and the steel casting is rapidly cooled through an aqueous solution, taken out and left to stand till the steel casting is cooled to the room temperature; and thirdly, the cooled steel casting is subjected to high-temperature tempering at the temperature of 500-650 DEG C, and heat preservation is conducted. The steel casting is subjected to heat treatment by adopting annealing, quenching and tempering processes, and barium hydroxide is added in the aqueous solution in the quenching process step, so that the cooling capacity of the aqueous solution can be improved, and the problem of corrosion of the steel casting does not need to be worried about.

This invention discloses a method for preparing and analyzing trans-4-aminocyclohexylacetic acid. The preparation method is as follows: 4-nitrophenylacetic acid undergoes catalytic hydrogenation in a solvent, followed by filtration. The filtrate is then treated with acid to obtain a 4-aminophenylacetic acid salt solution. The collected catalyst is activated. The 4-aminophenylacetic acid salt solution is mixed with isopropanol, barium hydroxide, tetrabutylammonium bromide, 18-crown ether-6, and dibutyl phthalate. The activated catalyst is then added to initiate a catalytic hydrogenation reaction. After the reaction, the reaction solution is cooled and filtered. The resulting solid is mixed with a preheated dilute sulfuric acid solution and stirred to form a slurry. The mixture is then filtered, and the filtrate is neutralized and filtered again. The collected filtrate is concentrated and crystallized. The crystallized precipitate is washed and dried to obtain trans-4-aminocyclohexylacetic acid. The method provided by this invention has high reaction efficiency, mild conditions, and is suitable for industrial production. It yields high product purity and reliability. Furthermore, the analytical method provided by this invention is accurate and reliable.

The invention provides a barium chloride production waste residue treatment method, and relates to the technical field of barium chloride production waste residue treatment, and the barium chloride production waste residue treatment method comprises the following steps: S1, carrying out ball milling on waste residues containing barium sulfate and barium sulfide, and then carrying out pre-oxidation and hydration treatment to obtain a barium hydroxide-containing turbid liquid; s2, dehydrating and drying the turbid liquid in the S1; s3, mixing and calcining the dried material and sodium carbonate to obtain a calcined product containing barium carbonate; s4, the calcined product is subjected to hot water leaching to remove soluble sodium salt, and water leaching residues are obtained; s5, first-stage acid leaching is conducted on the water leaching residues through low-concentration hydrochloric acid, and first-stage leaching liquid and first-stage filter residues are obtained through filtering; performing second-stage acid leaching on the first-stage filter residue by using high-concentration hydrochloric acid, and filtering to obtain a second-stage leaching solution; and S6, combining the first-stage leaching solution and the second-stage leaching solution, adjusting the pH value to 4.0-5.0, filtering and separating precipitates, and concentrating and crystallizing to obtain a barium chloride product. According to the method, efficient conversion and resource utilization of barium in the waste residues are achieved through the processes of pre-oxidation toxicity control, calcination conversion, gradient acid leaching and deep purification.

The invention discloses a high-speed rail sound screen wall self-repairing nano coating and a preparation method thereof, and belongs to the technical field of coatings, sodium alginate is crosslinked with calcium ions in calcium chloride, gel microspheres are formed on the surface of porous shell powder, a self-repairing agent is wrapped in the gel microspheres, barium nitride is hydrated to form barium hydroxide under the excitation action of water, and the self-repairing nano coating is formed. Barium hydroxide belongs to an alkaline compound, and through the wrapping effect of the microcapsule, the corrosion effect on a modified binder in a system can be reduced, so that the material has the advantages of light weight, sound insulation, good acid and alkali resistance, washing resistance and compressive strength; polyvinyl alcohol is used as a bridge, hydroxyl of polyvinyl alcohol is combined with carboxyl of carboxymethyl chitosan and then copolymerized with vinyl acetate to form a three-dimensional network structure, cohesive force of the adhesive and adhesive force to a base material are greatly improved, calcium ions are separated out due to the alkaline effect of barium hydroxide, and meanwhile the crosslinking strength of the adhesive can be improved; the bonding strength is further improved.

The invention relates to the technical field of concrete, in particular to concrete with high sulfate attack resistance and a preparation method thereof. The invention provides concrete with high sulfate attack resistance, which is prepared from the following components in parts by weight: 250 to 340 parts of Portland cement, 75 to 100 parts of fly ash, 100 to 125 parts of mineral powder, 1250 to 1450 parts of coarse aggregate, 640 to 720 parts of fine aggregate, 50 to 60 parts of epoxy resin, 15 to 25 parts of silica fume, 2 to 3 parts of barium hydroxide, 7 to 12 parts of organic phosphonate grafted polypropylene fiber, 2 to 3 parts of polycarboxylate superplasticizer, 1.5 to 2 parts of defoaming agent and 160 to 180 parts of water. The organic phosphonate grafted polypropylene fiber is obtained by carrying out esterification reaction on diglycolamine dimethylene phosphonate and maleic anhydride grafted polypropylene fiber, wherein the diglycolamine dimethylene phosphonate is prepared by reacting diglycolamine, phosphorous acid and formaldehyde. The concrete prepared by the invention has good sulfate corrosion resistance.

The application relates to the technical field of chemical analysis, and discloses a method for extracting, separating and detecting N-nitrosamine, which comprises the following steps: a sample obtaining step; a sample purification step; a preparation and extraction solution step; an extraction solution separation step; an extraction solution concentration step; a chromatographic detection and quantitative analysis step; the sample to be detected is crushed to a size of 0.01g of powder, and the powder is mixed with sodium chloride, barium hydroxide and water. In the application, the sample to be detected is subjected to a step-by-step sample treatment process before detection, so that the interference factors of the sample to be detected can be effectively reduced, the influence on the detection instrument is reduced, the detection result and detection data are more accurate, and when the application is detected, a large amount of sample does not need to be weighed like in the traditional detection mode, the overall operation is more convenient, and the detection demand of N-nitrosamine in smoked food is met.

The present invention discloses a high thermal conductivity shaped composite phase change material and a preparation method thereof, belonging to the field of phase change heat storage. The composite phase change material is made of foam metal filled with a modified phase change material, wherein the modified phase change material is composed of the following components by mass percentage: 98.7~99.3% barium hydroxide octahydrate, 0.2~0.8% nano copper oxide, and 0.5% thickener. The phase change temperature of the modified phase change material is 77.5°C, the phase change latent heat is 277.3J / g, and the thermal conductivity of the composite phase change material is 12.4W / (m·K). The present invention has the advantages of high latent heat and high thermal conductivity, can meet the actual needs of various engineering projects, and solves the problems of poor stability and low thermal conductivity of barium hydroxide octahydrate as a phase change material.

The present invention discloses a large-volume concrete hydration heat inhibitor, its preparation method and application, and belongs to the technical field of concrete admixtures. The hydration heat inhibitor includes a dissolving heat absorbing material, a temperature-controlling heat absorbing material, an intelligent heat-controlling material and a hydration reaction regulating material; wherein, the dissolving heat absorbing material includes at least one of calcium nitrate, ammonium nitrate and potassium nitrate; the temperature-controlling heat absorbing material includes sodium thiosulfate, paraffin and barium hydroxide octahydrate; the intelligent heat-controlling material is obtained by wrapping the dissolving heat absorbing material with polyethylene glycol; the hydration reaction regulating material is a calcium-complexed sulfonated dextrin. Under the joint action of the dissolving heat absorbing material, the temperature-controlling heat absorbing material, the intelligent heat-controlling material and the hydration reaction regulating material, the large-volume concrete hydration heat inhibitor of the present invention can realize step-by-step regulation of the hydration heat of large-volume concrete, significantly reduce the hydration heat of large-volume concrete, and effectively control the temperature cracks of large-volume concrete.

The invention discloses a method for extracting scandium from a byproduct FeSO4 # imgabs0 # H2O in a sulfuric acid process titanium dioxide waste acid concentration process, and belongs to the field of valuable resource recovery. The method comprises the following steps: mixing and dissolving FeSO4 # imgabs1 # H2O and water, filtering to obtain a ferrous sulfate solution, freezing, crystallizing and filtering to obtain a scandium-containing solution, and circulating for multiple times to increase the scandium concentration; then ferric iron in the solution is reduced, the pH is adjusted with barium hydroxide, scandium is precipitated, and a mixed solid of barium sulfate and scandium hydroxide is separated out; the method comprises the following steps: dissolving scandium hydroxide with acid, filtering and washing, precipitating scandium with oxalic acid or sodium oxalate, and finally roasting scandium oxalate at high temperature to prepare scandium oxide with Sc2O3 greater than or equal to 99.99% and Sc2O3 / REO greater than or equal to 99.9999%. The method has the advantages of being convenient to operate, simple in technological process, low in production cost and good in environmental protection benefit, industrialization is easy, the scandium element in the sulfuric acid process titanium dioxide waste acid concentration byproduct can be efficiently recycled, and efficient utilization of resources is achieved.

The application discloses a preparation method of a water-based developing solution, the water-based developing solution and application thereof, and belongs to the technical field of developing solutions. The preparation method comprises the following steps: a first amount of sulfuric acid is mixed with a second amount of isopropyl alcohol to obtain an isopropyl alcohol solution; tetramethylammonium chloride is mixed with the isopropyl alcohol solution according to a first preset proportion, a third amount of sulfuric acid is added, and the precipitate is filtered and dried to obtain white crystalline solid tetramethylammonium sulfate; the solid tetramethylammonium sulfate is dissolved in water, a suspension of barium hydroxide is added to the water, the reaction mixture is filtered, a tetramethylammonium hydroxide solution is obtained and purified; and the purified tetramethylammonium hydroxide solution is mixed with water according to a second preset proportion, and stirring is performed to obtain the water-based developing solution. The application aims to provide a water-based developing solution to solve the problem that the conventional developing solution in the form of an organic solvent is inconvenient to use in a chip developing process.

The invention belongs to the technical field of phosphate binders, and discloses a magnesium phosphate inorganic adhesive and a preparation method and application thereof, the magnesium phosphate inorganic adhesive comprises the following components by mass: 100 parts of dead burned magnesium oxide, 45-80 parts of potassium dihydrogen phosphate, 1-5 parts of an organic acid metal chelating agent, 1-5 parts of potassium hydroxide, 1-4 parts of borax, 0.7-1.5 parts of calcium chloride hexahydrate, 0.4-0.6 part of barium hydroxide octahydrate, and 20-32 parts of water. The magnesium phosphate inorganic adhesive is modified on the basis of raw material selection and mix proportion design, so that the coagulation time and fluidity of the magnesium phosphate inorganic adhesive are greatly improved, and the problems that the traditional magnesium phosphate inorganic adhesive is short in coagulation time and poor in fluidity, and cannot meet the construction requirements of the adhesive on sufficient infiltration and spreading of carbon fiber cloth are solved; the construction workability of the magnesium phosphate inorganic adhesive serving as the adhesive for reinforcing the carbon fiber cloth is guaranteed, and the magnesium phosphate inorganic adhesive can be applied to the field of reinforcing and repairing of large-quantity and wide-area concrete structures.

The invention provides a high-efficiency ethylene preparation method, and relates to the technical field of chemical synthesis. According to the method, ethephon ClCH2CH2PO (OH) 2 is used as an ethylene precursor, barium hydroxide Ba (OH) 2 is used as an alkaline reaction medium, ethylene is efficiently prepared through hydrolysis reaction at normal temperature, and high temperature and strong acid are not needed in the core reaction. The core innovation lies in that a'mild hydrolysis-directional gas production 'technology is adopted, the raw material ratio and reaction conditions are optimized, rapid gas production within 1 minute is realized, and the purity of ethylene is greater than or equal to 92%; the raw materials are easy to purchase, low in price and high in safety, byproducts can be recycled, and the problems that a traditional concentrated sulfuric acid dehydration method is high in corrosion risk, large in energy consumption and many in byproducts are solved. The method is easy and convenient to operate and visual in phenomenon, the gas production efficiency is improved by 60% or above compared with that of a traditional method, the cost is reduced by 50%, the ethylene property verification requirement in teaching is met, efficient preparation of small experiment scenes is also adapted, and remarkable safety, economical efficiency and practicability are achieved.

The application relates to the technical field of cable connectors, and discloses an integrated cable connector which comprises a bottom plate, a mounting frame located above the bottom plate, and a connector body located in the mounting frame, wherein the side surface of the connector body is provided with a connecting assembly; the inner side of the mounting frame is provided with a cooling assembly, the cooling assembly comprises a reaction box located on the inner side of the mounting frame, the top surface of the reaction box is fixedly connected with the inner side top surface of the mounting frame, and an adding pipe is arranged above the reaction box. Through the heat dissipation assembly, the connector body vibration pushes the push rod, the air pipe blows the adjusting plate to move downwards, the eight-water barium hydroxide powder in the partition plate enters the bottom of the reaction box through the through hole, the eight-water barium hydroxide powder is mixed with the ammonium chloride powder to react and absorb heat, the connector body is cooled, the connector body is prevented from being damaged, and the use effect of the integrated cable connector is improved.

The application relates to a spray drying technology assisted synthesis of barium titanate coated Ni particle material and a method thereof, and belongs to the technical field of metal powder material preparation. The method comprises the following steps: firstly, preparing a mixed solution by mixing metatitanic acid, barium hydroxide and nano and submicron Ni powder; secondly, synthesizing a Ni-based composite material intermediate by adopting a spray drying method; and finally, forming barium titanate coated Ni powder after sintering in a tube furnace. The barium titanate coated Ni inner electrode material is Ni@BaTiO3 spherical particles with a core-shell structure, the particles are core / shell microstructure, the shell layer is a barium titanate coating layer with a thickness of 10-15 nm, and the particle size is 100-150 nm. The required equipment can be scaled, the composition and microstructure are easy to control, the spherical degree and dispersity are high, the compactness is high, the repeatability is good, the particle size and distribution can be changed by adjusting process parameters, the oxidation resistance can be improved, good interface combination between the ceramic dielectric layer and the barium titanate coated Ni inner electrode material can be realized, and key problems such as mismatching of interfacial volume shrinkage and easy cracking in the sintering process can be solved.

The invention discloses a method for removing carbonate in a sodium aluminate solution, and relates to the technical field of sodium aluminate solution purification, and the method comprises the following steps: obtaining a barium hydroxide solution with a set mass concentration, and using barium hydroxide as a carbonate remover to prepare a reaction solution; adding the barium hydroxide solution into a sodium aluminate solution, so that the barium hydroxide and carbonate in the sodium aluminate solution are subjected to precipitation reaction to generate barium carbonate precipitate, thereby obtaining a mixed solution containing the precipitate; and carrying out solid-liquid separation on the mixed solution to obtain a sodium aluminate refined solution with carbonate removed and a barium carbonate precipitate. The method is simple and easy to implement, the removal cost of carbonate radicals is effectively reduced, and resources and energy are saved. Meanwhile, sodium hydroxide generated by the reaction of sodium carbonate and barium hydroxide can be used as a beneficial supplement in the production of aluminum hydroxide, so that the reutilization of resources is realized, and the total cost of carbonate removal is further reduced.

The invention relates to the technical field of a precursor for a lithium nickel manganese oxide positive electrode material, in particular to a method for preparing a lithium nickel manganese oxide precursor by using a by-product manganese salt, which comprises the following steps: carrying out barium hydroxide coagulation treatment on the by-product manganese salt and a crude nickel salt with low raw material price to obtain a primary filtrate, and then carrying out manganese fluoride treatment to obtain a secondary filtrate; a nickel manganese carbonate material with a micro-nano spherical structure can be prepared from a qualified water-phase solution obtained after tributyl phosphate is extracted and oil-water separation by adopting an ethanol-water mixed liquid-phase reaction system under the assistance of a surfactant and process conditions, an oil-phase solution is subjected to metal manganese reverse extraction to obtain a filter residue, namely manganese fluoride, and an oil phase is returned to an extracting agent again, so that the nickel manganese carbonate material with a micro-nano spherical structure is obtained. The waste water and the waste residue produced by the method can be returned to the process flow for reuse, so that the environmental pollution is small. The obtained product manganese sulfate solution can reach the standard of battery-grade manganese sulfate, the fluorine content of the solution is low, and the prepared nickel manganese carbonate precursor is high in purity and is superior to that of an existing process.

The invention relates to the technical field of fine chemical engineering, in particular to a preparation method of high-purity barium chloride. The method comprises the following steps: firstly, grafting an amino group on nano silicon dioxide and further synchronously introducing a hydrophobic chain and a phosphate group to prepare a difunctional surfactant with dispersion and impurity pre-adsorption functions for pretreating a witherite raw material; then calcining and dissolving with acid to obtain a crude solution, and sequentially carrying out multi-mechanism deep impurity removal and vacuum crystallization purification through barium hydroxide alkali adjustment hydrolysis, a targeted complexing agent and the like, so as to finally obtain high-purity barium chloride. According to the method disclosed by the invention, various impurities are efficiently and deeply removed through the cooperation of the whole processes of raw material pretreatment, targeted complexing and crystallization washing, the purity of the obtained barium chloride can reach 99.99% or above, the process flow is stable, and the yield is relatively high.

The invention relates to the technical field of catalysts, and particularly discloses a preparation method and application of a catalyst for hydrogenation of dimethyl 1, 6-adipate, and the preparation method of the catalyst comprises the following steps: S1, crushing and sieving montmorillonite, carrying out acid treatment, and washing and drying after treatment; s2, dissolving szaibelyite in hot nitric acid under stirring, filtering after dissolving is completed, adding a barium hydroxide solution into filtrate, mixing and stirring, adjusting the pH value to 9.5-10.5, and aging at 50-80 DEG C; s3, uniformly mixing the montmorillonite obtained in the S1 with the material obtained in the S2 for reaction, and then filtering, washing, drying and roasting to obtain a modified montmorillonite carrier; and S4, uniformly mixing the modified montmorillonite carrier, a metal salt solution and a precipitant, standing, aging, filtering, washing, drying and calcining to obtain the modified montmorillonite catalyst. The catalyst has good catalytic performance in the reaction process of preparing 1, 6-hexanediol through hydrogenation of dimethyl 1, 6-adipate, the conversion rate of dimethyl 1, 6-adipate and the selectivity of 1, 6-hexanediol are both higher than 99%, impurities are few, the catalyst is not prone to loss, and the catalyst is green and environmentally friendly.

The invention relates to a barium calcium sulphoaluminate cement clinker based on barium hydroxide sulfur fixation and a preparation method thereof. The barium calcium sulphoaluminate cement clinker is obtained by firing a cement raw material containing sludge, and the cement raw material is prepared from the following components in parts by weight: 30 to 60 parts of dried sulfur-containing sludge, 20 to 50 parts of CaO, 5 to 25 parts of SiO2, 5 to 40 parts of Al2O3, 3 to 18 parts of Fe2O3 and 10 to 25 parts of Ba (OH) 2. The preparation method comprises the following steps: preparing a mixture of cement raw materials in parts by weight to obtain raw material powder; carrying out high-temperature calcination on the raw material powder until all minerals are completely formed, and cooling to room temperature in a quenching manner, so as to obtain the barium calcium sulphoaluminate cement clinker. Compared with the prior art, the method has the advantages that barium hydroxide is applied to the sulfur fixation process for preparing the cement clinker through sludge combustion co-treatment, accumulation of municipal sewage sludge can be reduced, the sulfur fixation rate can be increased, and high-value cyclic utilization of waste resources is promoted.

The application discloses a preparation method of spherical nano-barium titanate coated nickel powder and belongs to the technical field of MLCC internal electrode materials. The method comprises the following steps: dispersing nano-nickel powder in water and performing ultrasonic treatment; adding titanium tetrachloride into the water, and then adding a nickel powder dispersion liquid; then adding a barium source, adjusting the pH to alkaline by using lye, stirring and reacting at 60-80 DEG C under normal pressure and in an air atmosphere, and separating and drying to obtain the product. The barium source is barium hydroxide, barium chloride or barium acetate. The application uses cheap titanium tetrachloride as a titanium source to synthesize the barium titanate coated nickel powder with a core-shell structure in an aqueous solution in one step, and the reaction condition is mild, and no organic solvent and inert atmosphere protection are needed, so that the process is simple and the cost is low. The obtained product has a continuous and dense coating layer, the oxidation starting temperature is above 385 DEG C, the volume shrinkage rate at 1200 DEG C is less than or equal to 9.1%, the oxidation resistance and sintering shrinkage matching property of the nickel powder are significantly improved, and the product is suitable for MLCC internal electrode materials.

The invention relates to the fields of chemical industry, pyrotechnic compositions, fireworks and crackers and the like, and relates to preparation of barium fumarate serving as a novel compound material with coloring agent and reducing agent effects, and preparation and application of the material in the fields of pyrotechnic compositions, fireworks and crackers and the like. The preparation method comprises the following steps: mixing fumaric acid and barium carbonate or barium oxide or barium hydroxide, and heating an aqueous solution to prepare barium fumarate; furthermore, the barium fumarate can be fully mixed with selected other substances to prepare a green pyrotechnic composition, and the green pyrotechnic composition is applied to fireworks and crackers and other fields; in addition, the barium fumarate is mixed with other selected substances, a small amount of perchlorate can be selectively added and fully mixed to prepare non-pyrotechnic composition or pyrotechnic composition substances in various geometrical shapes, and then the substances are placed in handheld, ground and air (including aircrafts) devices or equipment to be used for preparing the non-pyrotechnic composition or pyrotechnic composition. The non-pyrotechnic composition and the pyrotechnic composition substance can be ignited according to the electronic heating principle, and green light is emitted through combustion for color development.

The present application relates to the preparation method of tranexamic acid and its simplified process, which comprises the following steps: providing platinum carbon catalyst; mixing the platinum carbon catalyst, aminomethylbenzoic acid, water and concentrated sulfuric acid in a hydrogenation kettle; replacing the atmosphere in the hydrogenation kettle with hydrogen, hydrogenating, filtering to obtain a hydrogenation reaction liquid; adding barium hydroxide to the hydrogenation reaction liquid, treating at high temperature and high pressure in the hydrogenation kettle to convert the configuration, neutralizing with sulfuric acid solution, cooling, filtering to obtain a mother liquor; passing the mother liquor obtained by neutralizing with sulfuric acid through a first carbon column adsorption tank, cooling the decolorized liquid to crystallize; dissolving the crystallization in water, passing through a second carbon column adsorption tank, cooling the decolorized liquid to crystallize; dissolving the crystallization in water, passing through a third carbon column adsorption tank, cooling the decolorized liquid to crystallize, filtering the crystallization, drying to obtain refined tranexamic acid. The method of the present application is particularly suitable for industrial production, has simple process, high efficiency, friendly operation environment and less hazardous waste.

The invention provides a barium titanate material and a preparation method thereof.The preparation method of the barium titanate material comprises the following steps that S1, tetrabutyl titanate, an organic solvent and organic acid are taken and mixed to form a mixed solution, barium hydroxide is added into the mixed solution, stirring is conducted, a hydrothermal reaction is conducted after stirring, and a precipitate is obtained; and S2, carrying out acid pickling and water washing on the precipitate, and drying. The barium titanate material provided by the invention is uniform in size, has an average particle size of 70nm, has a single domain structure, and lays a solid foundation for optimizing the performance of a multilayer capacitor.

The present application relates to the technical field of barium hydroxide preparation, and proposes a method for preparing barium hydroxide based on barium carbonate, comprising the following steps: S1, adding a dispersing agent and a phase transfer promoter into water, stirring uniformly, then adding barium carbonate, and then ultrasonic dispersion under the condition of 65-70 DEG C to obtain a slurry; S2, adding organic amine into the slurry of step S1, adjusting the pH value to 10.8-11.5, then adding a complexing agent to remove impurities, adding alkali to adjust the pH value to 11.8-12.4, heating to 75-85 DEG C, and then putting in barium hydroxide seed to induce nucleation and precipitate barium hydroxide; S3, heat filtering the reaction product of step S2, and then washing and drying the filter cake to obtain barium hydroxide. Through the synergistic process of dispersing agent, phase transfer promoter and segmented pH control, the present application realizes the effect of efficiently preparing barium hydroxide from barium carbonate.

The invention relates to the field of polyvinyl chloride processing aids, and provides a processing aid and a preparation method and application thereof.The processing aid provided by the invention is especially suitable for being applied in the polyvinyl chloride processing process, can remarkably improve the processing performance of polyvinyl chloride, especially can improve the lubricity and the heat resistance at the same time, and is suitable for popularization and application. The obtained product is flat and smooth in surface. The processing aid is obtained by carrying out emulsion polymerization on a pre-emulsified liquid and an organic barium material liquid in the presence of an initiator and then carrying out dehydration and drying; the pre-emulsion is obtained by pre-emulsifying raw materials including an alkenyl benzene hydrocarbon monomer, an alkenyl nitrile monomer, an emulsifier, a polytetrafluoroethylene emulsion and water in a mass ratio of (69-85.5): (15-30): (1.5-2.4): (3-6): (50-75); the organic barium feed liquid is obtained by reacting raw materials including an alkenyl carboxylic acid monomer, a molecular weight regulator, barium hydroxide and water in a mass ratio of (0.3-0.6): (0.4-0.6): (0.2-0.4): (50-75).

The invention discloses preparation and application of a high-refractive-index barium titanate nanofiller for a nanoimprint process, and the preparation method comprises the following steps: adding barium hydroxide octahydrate into a solvent, ultrasonically mixing uniformly, then adding titanium dioxide, and continuously performing ultrasonic treatment to obtain a mixed solution; transferring the mixed solution into a reactor for solvothermal reaction, naturally cooling, taking out, standing for layering, removing supernate, washing and filtering the residual solid-liquid mixture, and drying to obtain the high-refractive-index barium titanate nanofiller for the nanoimprint process. The invention develops a preparation method of a high-refractive-index barium titanate nanofiller for a nanoimprint process. A solvothermal method is used for preparing the high-purity and nearly spherical barium titanate nanofiller with the particle size of 1t; the BaTiO3 nanofiller with the refractive index of 30 nm can be applied to a nanoimprint process, and a new material solution of a high-refractive-index coating is provided for diffraction optical waveguides of AR (Augmented Reality) glasses.

This invention belongs to the field of pentosan preparation technology, specifically a method for preparing pentosan. Wheat bran powder undergoes a hydrothermal reaction in an aqueous barium acetate solution. Water extraction yields a supernatant and precipitate containing water-soluble pentosans. Sodium hydroxide and acetylacetone are then added, followed by alkaline extraction at 30-40°C to obtain a supernatant containing both water-soluble and alkali-soluble pentosans. This supernatant is then post-treated to obtain the pentosan product. This invention improves the extraction rate of water-soluble pentosans; the alkaline extraction effect is superior to that achieved using sodium hydroxide and barium hydroxide alone, and it reduces the amount of alkali solution, especially Ba(OH)₂, used.

The present invention discloses a high-purity barium hydroxide octahydrate purification production system and method, belonging to the technical field of barium hydroxide octahydrate purification. It includes a raw material bin, a mother liquor tank, a dissolution tank, a precision filter, a transfer tank, a DTB crystallization system, a thickener, a centrifugal separator, a dryer, a jet mill, and an automatic packaging machine that are connected in sequence. The entire processing process is continuous, and the production process is completed in a closed system, improving the efficiency and making the entire operation process safer.

The present application relates to a kind of light-weight foam concrete and its preparation method, belong to light-weight concrete technical field, according to weight fraction, its preparation raw material includes: 40-55 parts of Portland cement, 10-15 parts of petroleum pitch, 10-20 parts of river sand, 10-15 parts of foaming agent and 8-16 parts of modified cellulose fiber;Wherein, the modified cellulose fiber is obtained by swelling treatment and steam treatment to cellulose fiber.The internal pressure of closed container is added when steam treatment, the compressive strength, the flexural strength performance of the modified cellulose fiber processed also can increase the light-weight foam concrete prepared, the compressive strength, the flexural strength performance of sample is greatly influenced by using modified cellulose fiber and secondly, the compressive strength, the flexural strength performance of sample is also influenced by adding barium hydroxide in swelling agent, the cellulose fiber after modification has good anti-freezing performance in anti-freezing aspect, can be used in the area of lower temperature.