352 results about "Alkaline catalyst" patented technology

The invention discloses a dispergator of a polyurethane structural adhesive as well as a preparation method and application of the dispergator. The dispergator comprises a polar organic solvent, an alcohol additive, a basic catalyst, an ionic liquid and a surfactant. The dispergator is suitable for removing a bonding interface of a thermosetting polyurethane structural adhesive in a power battery module, the dispergation process is mild and safe, and swelling, fracture and interface release of the structural adhesive can be realized in a range from normal temperature to 55 DEG C. Compared with a traditional high-corrosion and high-energy-consumption dispergation means, the dispergation agent has the advantages of being high in degumming efficiency, little in residual gum, free of base material corrosion and the like, is suitable for the environment-friendly recycling and reusing scene of the retired lithium battery, and has good engineering practicability and popularization value.

The invention relates to the technical field of heat energy storage materials, and particularly provides a silicon dioxide aerogel composite phase change heat storage material and a preparation method thereof. The method comprises the following steps: mixing an organic silicon source, absolute ethyl alcohol and deionized water according to a specific ratio, fully stirring to obtain a mixed solution, and dropwise adding an acid catalyst into the mixed solution at room temperature for hydrolysis reaction to obtain a hydrolysate; sequentially adding a drying control agent and an alkali catalyst, and standing for gelation reaction to obtain gel; adding an organic solvent to carry out aging reaction, and then adopting the organic solvent to carry out replacement for multiple times to obtain alcogel; replacing the alcohol gel with an organic solvent for multiple times to obtain wet gel, soaking the wet gel in an excessive molten phase change material, and carrying out normal-pressure solvent replacement and drying at 40 DEG C to obtain the phase change material, the loading capacity of octadecane in the obtained CPCM is about 83%, the phase change enthalpy reaches up to 192J / g, the heat conductivity is as low as 0.0812 W / m.K, and no obvious leakage occurs after 200 times of circulation.

The invention discloses a preparation method of high-temperature-resistant hydrophobic aerogel. The preparation method comprises the following preparation steps: (1) adding acid into a mixed solution of organic estersil or organic silicon and alcohol, controlling the pH value to 2-5.5, then adding silica sol, and stirring to obtain hydrolysate A; wherein the silica sol is a mixture of first silica sol with the D50 particle size of 8-20 nm and second silica sol with the D50 particle size of 50-100 nm; (2) adding a basic catalyst into the hydrolysate to obtain a sol substance B; (3) adding an opacifying agent and a flame retardant into the sol substance B to obtain a sol substance C; and (4) carrying out gelation, aging, hydrophobic modification and drying on the sol C to prepare the aerogel. The aerogel provided by the invention has excellent hydrophobic performance and extremely low water absorption rate at high temperature.

The invention provides a preparation method of dicapryl carbonate, belongs to the field of preparation of dicapryl carbonate, and can solve the problems of unstable reaction system, low raw material conversion rate, low catalyst efficiency, poor phase contact effect, many side reactions, low product purity and poor quality in the existing preparation method of dicapryl carbonate. The preparation method of dicapryl carbonate comprises the following steps: fully mixing n-caprylic alcohol, a basic catalyst and a cosolvent, continuously dropwise adding low-grade dialkyl carbonate into the mixed solution for 5-10 hours through a liquid material distributor, carrying out ester exchange reaction, continuously extracting low-boiling-point substances, controlling the reflux quantity, and carrying out reduced pressure distillation to obtain the dicapryl carbonate. The method comprises the following steps: adding a cosolvent into a reaction solution, enabling the cosolvent with an initial addition amount to always exist in the reaction solution, after the reaction is finished, dealcoholizing by reduced pressure distillation, and removing impurities by washing to obtain a crude product of dioctyl carbonate, and rectifying to obtain a dioctyl carbonate product. The preparation method is high in raw material conversion rate and high in product yield, and the purity of the obtained product is gt; the content of impurities is low, and the method can be applied to preparation of cosmetics.

The invention discloses a preparation method of an aerogel laminated composite heat insulation pad, and relates to the technical field of aerogel heat insulation pads, and the preparation method comprises the following steps: mixing and dispersing a silane precursor and absolute ethyl alcohol, adding a basic catalyst, hydrolyzing to generate sol, and aging to form prefabricated sol; adding a flame retardant, a smoke retardant and reinforced fibers, dispersing and gelatinizing, and carrying out supercritical drying to obtain an aerogel block; and coating basalt fiber non-woven fabric with the aerogel slurry to form a base layer, laminating a plurality of layers, and carrying out hot-pressing curing, cooling, post-curing, cutting and edge covering to obtain the composite heat insulation pad. According to the invention, by optimizing the ratio of silane and a drying process, the pore structure and the thermal stability of the aerogel are obviously improved; the flame-retardant, mechanical and heat-insulating properties are improved through multi-component collaborative design, and the obtained heat-insulating pad has the characteristics of low heat conductivity, high strength, excellent flame retardance and light weight, and is suitable for multiple heat-insulating and flame-retardant fields.

The invention relates to the technical field of lithium / sodium ion batteries, in particular to a preparation method of a highly graphitized coated carbon material based on phenolic resin, which comprises the following steps: uniformly mixing formaldehyde, resorcinol and a basic catalyst, and then catalyzing and curing; carrying out carbonization treatment on the uncarbonized phenolic resin based on a gradient heating method; mixing ethidene diamine, dichloromethane and carbonized phenolic resin, and heating in an oil bath; and placing the cured and coated graphitized phenolic resin in a tubular furnace for highly graphitizing. According to the preparation method of the highly-graphitized coated carbon material based on the phenolic resin, high ordering of a carbon layer is achieved through gradient heating graphitization, a carbon six-membered ring plane is promoted to expand, an ABAB stacked graphite structure is formed, the conductivity is effectively improved, a CVD coating and nitrogen doping synergistic technology is combined, a CVD reaction is formed through ethanediamine and dichloromethane, and the high-graphitization coated carbon material based on the phenolic resin is obtained. Functional groups such as pyridine-N and graphite-N are introduced to the surface of the carbon layer, so that the interface bonding force between the carbon layer and the matrix is enhanced, and the conductivity of the carbon layer is further improved.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

The invention belongs to the field of synthesis of 4, 6-dihydroxypyrimidine, and discloses a preparation method of 4, 6-dihydroxypyrimidine, which comprises the following steps: S1, adding malonamide, a basic catalyst and an organic solvent into a reaction bottle, and fully stirring to obtain a mixed solution; s2, under the stirring condition, carboxylic ester derivatives are dropwise added into the mixed solution; s3, after the carboxylic ester derivative is dropwise added, carrying out a heat preservation reaction; and S4, carrying out post-treatment on the reaction liquid obtained by the heat preservation reaction to obtain the target product 4, 6-dihydroxypyrimidine. The post-treatment comprises acidification, filtration, washing and drying. The preparation method of 4, 6-dihydroxypyrimidine has the advantages of mild reaction conditions, simple and safe operation, cheap and easily available raw materials, high yield, good product purity and environmental friendliness, and has important practical significance and application value.

The invention provides a preparation method of ultra-low thermal conductivity silicon-based aerogel, and relates to the field of aerogel material preparation, and the preparation method comprises the following steps: S1, preparing a component A and a component B. The component A is prepared by fully mixing a silicon source, a modified silicon dioxide seed crystal, absolute ethyl alcohol and deionized water, then slowly adding an acid catalyst, and carrying out hydrolysis; the component B is a basic catalyst solution obtained by uniformly mixing deionized water and stronger ammonia water; step S2, gelling: fully mixing the component A and the component B to obtain wet gel, and then mixing the wet gel with a fiber felt to obtain a wet gel felt; step S3, aging; and S4, performing supercritical drying. According to the method, by introducing the modified silicon dioxide seed crystal, the thermal conductivity of a solid structure of the aerogel is effectively reduced, meanwhile, formation of macropores, communicating pores and the like is inhibited, and the performance of the aerogel is improved.

This invention relates to a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative, its preparation method, and its application. A trifluoromethyl-substituted pyrene-phenylacetonitrile derivative has the structural formula: [formula omitted]. The preparation method involves dissolving 1-pyrene formaldehyde, the corresponding trifluoromethylphenylacetonitrile, and an alkaline catalyst in an organic solvent, and carrying out a Knoevenagel condensation reaction under heating conditions. The reaction product is then post-treated to obtain the pyrene-phenylacetonitrile derivative. The application of a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative in electrical storage devices is also discussed. This invention achieves precise control of storage performance by introducing trifluoromethyl groups at different positions on the benzene ring of the pyrene-phenylacetonitrile backbone, providing a novel design approach for developing new multi-level electrical storage materials. The synthesis route is concise and has broad application prospects in the field of high-density non-volatile memory.

The present application relates to the low temperature curing high-strength benzoxazine type silicone adhesive formula and use method, the formula includes the benzoxazine group containing organic silicon compound and organic alkali compound, the mass ratio of benzoxazine group containing organic silicon compound, organic alkali compound is 100:0.1-20.The adhesive of the present application is based on the cooperation between the benzoxazine group containing organic silicon compound and the basic catalyst, can be cured at low temperature, realize the higher strength bonding.The benzoxazine type silicone adhesive formula provided by the present application can be directly used as adhesive, and the bonding strength is high;It can also be used as a basic formula, used as an adhesive after adding other fillers, to meet the different needs of various special occasions.

The invention discloses a synthesis method of piperonone, and relates to the technical field of flavors, fragrances and chemical engineering, and the synthesis method comprises the following steps: taking acrylate as a raw material, and carrying out Michael addition reaction with isobutene under the action of Lewis acid to obtain 5-methyl-5-hexenoic acid ethyl ester; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on ethyl 5-methyl-5-hexenoate and bromoisopropane under the action of a basic catalyst to obtain ethyl 5-methyl-2-isopropyl-5-hexenoate; carrying out self Friedel-Crafts acylation reaction on the 5-methyl-2-isopropyl-5-hexenoic acid ethyl ester under the action of Lewis acid, so as to obtain 5-methyl-2-isopropyl-5-chloro cyclohexanone; and carrying out elimination reaction on the 5-methyl-2-isopropyl-5-chlorocyclohexanone under the action of alkali to obtain the product piperonone. According to the synthetic route, conventional chemical reagents are used as raw materials, reaction conditions are mild, emission of three wastes is reduced to a great extent, and the synthetic route is more environmentally friendly and suitable for continuous industrial production.

The invention relates to the technical field of polyester degradation, in particular to a selective depolymerization method of polyester in a polyester composite material. The selective depolymerization method comprises the following steps: carrying out a depolymerization reaction on a polyester composite material, a cosolvent, a depolymerization agent and a basic catalyst at normal pressure and a temperature not higher than 65 DEG C, the cosolvent is at least one of an ethylene glycol diether compound, a propylene glycol diether compound and an isobutyl ketone compound. According to the selective depolymerization method, an ethylene glycol diether compound, a propylene glycol diether compound and an isobutyl ketone compound are used as cosolvents, a depolymerization agent is used as a methylation reagent, and directional polyester depolymerization of a polyester composite material can be realized at normal pressure and the temperature not higher than 65 DEG C; when the polyester material is degraded, the non-polyester material is basically not degraded or depolymerized, and the selective depolymerization and separation of the polyester composite material such as a polyester blended fabric can be realized.

The application provides a preparation method of a diphenylfluorene polyether. The method uses diphenylfluorene as a substrate, butylene oxide as an epoxide monomer, toluene as an organic solvent, and under the action of a composite catalyst, reacts at 110-200 DEG C for 2-6 hours to obtain the diphenylfluorene polyether. The composite catalyst is obtained by reacting a porous aromatic skeleton with a bromoalkyl quaternary ammonium salt to obtain a quaternary ammonium salt functionalized porous aromatic skeleton, and finally, a basic catalyst is limitedly encapsulated in the pore channel of the quaternary ammonium salt functionalized porous aromatic skeleton by electrostatic attraction. The catalyst of the method can be recycled and reused, and the yield retention rate is greater than or equal to 92% after the composite catalyst is used for 5 cycles, and the method is suitable for optical display, high-frequency circuit board, semiconductor packaging and other fields.

The disclosed recycling method of waste polyester depolymerization and mild selective depolymerization of blended textiles is to use waste polyester and blended textiles as raw materials, under the action of alkaline catalyst, or use mixed solvents composed of alcohol compounds and aprotic solvents as reaction solvents, or use alcohol compounds or mixed solvents composed of alcohol compounds and aprotic solvents as reaction solvents, so that the polyester in waste polyester and blended textiles undergoes hydrolysis, selective hydrolysis, alcoholysis or selective alcoholysis, and then depolymerizes to generate small molecule degradation products, while other non-polyester components do not undergo chemical changes. The alkaline catalyst and reaction solvent selected by the application not only can reduce the reaction temperature, but also can efficiently catalyze the depolymerization of polyester without causing chemical changes in non-polyester components, so that the energy consumption and reaction time can be greatly reduced, the recycling efficiency can be improved, the purity and yield of polyester depolymerization products can be greatly improved, and the recycling and utilization of all components in textiles can be realized.

The application relates to the technical field of surfactants, in particular to a pentadecyl phenol alkoxyl ether sodium sulfate surfactant and a preparation method thereof. The preparation method of the pentadecyl phenol alkoxyl ether sodium sulfate surfactant comprises the following steps: after pretreatment, cashew nut shell liquid is selectively hydrogenated to obtain pentadecyl phenol with a specific composition; then, alkoxylization reaction is carried out under the condition of an alkaline catalyst to obtain pentadecyl phenol polyalkoxyl ether; and the pentadecyl phenol polyalkoxyl ether is sulfated and neutralized to obtain the pentadecyl phenol alkoxyl ether sodium sulfate surfactant. The surfactant improves the problem that the activity of the surfactant is reduced when the saturation of the pentadecyl phenol is too high or too low; ensures that the final product has good fluidity at low temperature, guarantees the continuity of production, effectively reduces the occurrence of over-sulfation; and simultaneously improves the production efficiency and reduces the cost.

This invention relates to a taraxasterol nitrobenzoate derivative in the field of medicinal chemistry, with the following structural formula: Compound B is obtained by reacting taraxasterol 1 with 4-nitrophthalic anhydride in a suitable alkaline catalyst and organic solvent. This synthetic route offers high yield and is easy to implement. Activity tests demonstrate that the taraxasterol nitrobenzoate derivative shown as B, designed and synthesized in this invention, is a suitable antitumor drug candidate, particularly as a candidate drug for lung cancer.

The invention discloses a hard carbon negative electrode material and a preparation method and application thereof, the preparation method comprises the following steps: mixing a phenol source, formaldehyde, a solvent and a basic catalyst, and carrying out catalytic reaction on the phenol source and the formaldehyde under an alkaline condition to form phenolic resin to obtain a phenolic resin solution; mixing a metal salt and a phenolic resin solution to obtain a phenolic resin / metal salt precursor solution; curing the phenolic resin / metal salt precursor solution in an air atmosphere, cooling to room temperature to obtain a phenolic resin / metal salt cured material, crushing, grinding and sieving to obtain phenolic resin / metal salt cured material fine powder; and carbonizing the phenolic resin / metal salt cured material fine powder in a nitrogen or inert gas atmosphere, and cooling to room temperature to obtain the hard carbon negative electrode material. The preparation method disclosed by the invention is simple and efficient, the problems of non-uniform distribution of metal particles and weak interface bonding force are avoided, and the buffer effect of hard carbon and the capacity advantage of metal elements are fully exerted.

The invention provides a preparation method and application of an ultra-transparent silicon dioxide aerogel thermal insulation material. The method comprises the following steps: dissolving a nonionic surfactant in an acidic solvent, and then adding double silicon sources for hydrolysis to obtain a silicon source precursor; dropwise adding a basic catalyst into the silicon source precursor solution, and carrying out sol-gel reaction to obtain wet gel; and putting the wet gel into a drying oven, carrying out aging treatment, and then carrying out solvent replacement and supercritical drying to obtain the ultra-transparent silicon dioxide aerogel. The prepared aerogel has the heat conductivity coefficient of 0.0259 W / m.K to 0.0339 W / m.K, the light transmittance of 67% to 95% and the water contact angle of 102 degrees to 121 degrees, the temperature of the aerogel is 3.5 DEG C lower than that of a common glass window in simulation of a building energy-saving window, the temperature of the aerogel is 27.3 DEG C higher than that of a common solar heat collection device in simulation of a solar heat collection device, the problem that low heat conductivity coefficient, high light transmittance and water repellency cannot be achieved at the same time is solved, and the aerogel is suitable for being used in a building energy-saving window and a building energy-saving window. The method has huge application value in the fields of building energy conservation, solar heat collection systems, super transparent heat insulation, deep space exploration and the like.

The invention discloses a microemulsion collecting agent applying jatropha curcas oil to low-rank coal flotation and preparation and application of the microemulsion collecting agent, and belongs to the technical field of low-rank coal flotation, the microemulsion collecting agent is composed of jatropha curcas oil biodiesel, a surfactant, a cosurfactant and water, and the preparation method of the microemulsion collecting agent comprises the steps that 1, crude jatropha curcas oil and methyl alcohol are subjected to transesterification in the presence of a basic catalyst, the jatropha curcas oil biodiesel is obtained; (2) dissolving a surfactant in water to prepare a solution; (3) mixing the jatropha curcas oil biodiesel with a surfactant solution, adding a cosurfactant, and stirring at room temperature to form a microemulsion; and (4) the microemulsion is filtered, and the microemulsion collecting agent is obtained. The collecting agent solves the problems that a low-order bituminous coal flotation collecting agent is low in selectivity, poor in collecting performance, large in agent dosage, low in clean coal yield and high in ash content, and has good industrial application and popularization prospects.

The invention provides a developing embolism microsphere, a preparation method thereof and a drug-loaded developing embolism microsphere, and relates to the technical field of embolism microspheres. The developing embolism microsphere comprises a polymer network structure formed by cross-linking polymerization of an iodine-substituted tyrosine derivative and a cross-linking agent with an epoxypropane end group; the iodine-substituted tyrosine derivative comprises at least two active groups capable of reacting with an end group of epoxypropane. The preparation method of the developing embolism microspheres comprises the following steps: adding an alkaline catalyst into water to prepare an alkaline aqueous solution, sequentially adding an iodine-substituted tyrosine derivative and a crosslinking agent with an epoxypropane end group, and pre-crosslinking for a period of time to obtain an aqueous phase solution; mixing an oil-phase solvent and a dispersing agent to obtain an oil-phase solution; and adding the oil-phase solution into the water-phase solution to obtain a water-in-oil reversed-phase suspension system, and heating for reaction to obtain the developing embolism microspheres. The developing embolism microsphere provided by the invention is more uniform in developing, can load more types of medicines, and has a better slow release effect.

This invention discloses a cashew nut shell bisphenol and its preparation method and application. The preparation method of the bisphenol is as follows: First, cashew nut shell phenol, formaldehyde, and an alkaline catalyst are mixed and stirred evenly, and reacted at a certain temperature to obtain hydroxymethylated product A; product A is washed with water several times until the pH is neutral, and then centrifuged to remove water to obtain product B; product B is mixed with phenol and an acidic catalyst and stirred evenly, and reacted at a certain temperature to obtain product C after the phenol-alcohol reaction; product C is washed with water until neutral, and then distilled under reduced pressure to obtain the cashew nut shell bisphenol product. This invention utilizes the structural characteristics of cashew nut shell phenol, which has both a benzene ring and an alkane chain, to obtain a bisphenol structure that combines the rigidity of the benzene ring with the toughness of the long alkane chain on cashew nut shell phenol, while protecting the highly reactive phenolic hydroxyl group. Moreover, this bisphenol is green and low in toxicity, meeting the requirements of environmental protection and sustainable development. The epoxy coating prepared using this bisphenol has high crosslinking density, good corrosion resistance, and excellent mechanical properties.

The invention provides a one-pot synthesis method of 1, 3-dimethyl-2-imidazolidinone, which comprises the following steps: mixing a basic catalyst, an ionic liquid and methanol, adding ethylenediamine to synthesize 2-imidazolidinone under a low-temperature condition, and raising the temperature to enable the 2-imidazolidinone and dimethyl carbonate to have an N-methylation reaction. According to the synthesis method, the ionic liquid is adopted as the catalyst, on one hand, the ionic liquid serves as a phase transfer catalyst, and the acid binding effect of the acid binding agent is enhanced; on the other hand, as a carbene catalyst, dimethyl carbonate is activated, so that the acylation and methylation reaction efficiency is improved.

The invention discloses a preparation method of phenolic resin-based hard carbon, a negative pole piece and a battery, and the preparation method comprises the following steps: S1, mixing formaldehyde and furfural to obtain a mixed aldehyde solution; s2, adding mixed aldehyde and phenol into a solution containing a basic catalyst, and reacting to generate a liquid phenolic resin prepolymer; s3, adding carbon nanotubes into the liquid phenolic resin prepolymer, and dispersing the carbon nanotubes into the liquid phenolic resin prepolymer to obtain a second prepolymer; s4, curing the second prepolymer to obtain cured resin; and S5, carbonizing the cured resin to obtain phenolic resin-based hard carbon, thereby enhancing the sodium storage capacity and conductivity of the hard carbon.

This invention discloses a polyolefin-containing DCPD epoxy resin and a copper-clad laminate composition thereof, and its preparation method. The method is characterized by: polymerizing polyallyl phenol and catalyst A at high temperature to form polyallyl phenol; then reacting DCPD, polyallyl phenol, and catalyst B at high temperature to form a polyolefin-containing DCPD phenol resin; subsequently, epoxidizing the resin with epichlorohydrin and alkaline catalyst C to synthesize a polyolefin-containing DCPD epoxy resin; finally, mixing the resin with maleimide resin, phosphorus-containing phenolic resin, imidazole accelerator, inorganic filler, and solvent to obtain the polyolefin-containing DCPD epoxy resin composition for copper-clad laminates. The polyolefin-containing DCPD epoxy resin and copper-clad laminate composition prepared by this invention exhibits low dielectric constant, low dielectric loss, and high heat resistance, making it particularly suitable as a raw material for copper-clad laminates and highly practical.

A method for producing a phenol resin includes, in the following order: a decomposition step for heating and pressurizing a mixture 1 containing a phenol resin cured product, phenol, and an alkali catalyst 1, and decomposing the phenol resin cured product to obtain a phenol composition containing phenols; and a synthesis step for synthesizing a phenol resin using the phenols. The phenols have a weight-average molecular weight (Mw) of 3000 or less as measured by the following <Method 1>. <Method 1> The phenol composition is dissolved in THF, filtered through a filter having a pore size of 0.2 um, and the filtrate is used as a THF-soluble fraction. Next, the THF-soluble fraction is subjected to GPC measurement under the following conditions, and the weight-average molecular weight (Mw) is calculated. (Conditions) Eluent: THF, calibration curve: polystyrene equivalent, detector: differential refractometer, flow rate: 1 mL / min, temperature: 40°C

A process for making hydrofluoroethers, the process comprising: •A) providing a mixture comprising one more polar aprotic organic solvents having a boiling point measured at 1 atm (1.01 bar) of from 60° C. to 170° C. and one or more chemical compounds carrying at least one —OH group which is part of an alcohol or of a phenol group, and •B): reacting said one or more chemical compounds carrying at least one —OH group with one or more fluorinated olefin in the presence of a basic catalyst thus providing a reacted mixture comprising one or more hydrofluoroethers.

The application discloses a synthesis method of glycerin polyoxyethylene ether fatty acid ester, which comprises the following steps: taking glycerin polyoxyethylene ether and natural oil with a molar ratio of 3:1 as raw materials, and under the action of an alkaline catalyst, the mass percentage content of the alkaline catalyst in the natural oil is 0.3-0.6%, so as to obtain glycerin polyoxyethylene ether fatty acid ester. The product glycerin polyoxyethylene ether fatty acid ester can form a transparent and stable nanometer micellar system with a little blue light in water, and can be applied to personal washing and protection products and cosmetic formulations as a fat agent.

The invention relates to the technical field of phenolic resin, in particular to dialdehyde cellulose-based phenolic resin and a preparation method thereof. The dialdehyde cellulose-based phenolic resin is prepared from dialdehyde cellulose, phenol, formaldehyde and a basic catalyst. According to the invention, the dialdehyde cellulose prepared from renewable biomass resource cellulose is used for replacing part of formaldehyde to prepare the dialdehyde cellulose-based phenolic resin, so that the use amount of formaldehyde can be reduced by 20%, and the production cost and material toxicity of the phenolic resin are reduced. Meanwhile, the dialdehyde cellulose-based phenolic resin prepared by the method disclosed by the invention has excellent bonding performance and thermal stability. Technical support is provided for solving the problems that biomass components are difficult to utilize, phenolic resin raw materials excessively depend on non-renewable resources, the bonding performance is not ideal and the like, and great application and popularization value is achieved.

The application discloses a method for improving the separation yield of pseudo-isomethyl ionone, which comprises the following steps: condensation reaction of butanone and citral in a solvent under the action of an alkaline catalyst; after neutralization of the reaction solution, part of the solvent and unreacted raw materials are removed through a first desolventizing tower; the material in the first desolventizing tower is mixed with water and then enters a second desolventizing tower; and the liquid in the second desolventizing tower enters an oil-water separation tank to obtain a crude pseudo-isomethyl ionone product and waste brine. The method adopts double-tower continuous separation to remove the reaction solvent of pseudo-isomethyl ionone, and water is added between the two towers, so that water washing and salt removal are realized during the separation, and the separation yield of the crude product is greater than 99%. The method is simple in operation and is an economical separation method of pseudo-isomethyl ionone.