41 results about "Isopentenol" patented technology

The invention relates to an isopentenol polyoxyethylene ether defoaming agent and a preparation method thereof, the defoaming agent is mainly prepared from a cross-linked acrylic copolymer emulsion, an alkali swelling thickener, a modified organic silicon defoaming active matter, a pH regulator (NaOH / KOH), an isothiazolinone bactericide, deionized water and the like in proportion, and the defoaming agent has excellent defoaming performance and stability. A specific auxiliary agent is added. The foam problem of an isopentenol polyoxyethylene ether product in downstream application is solved, and the defoaming agent is mainly applied to defoaming of isopentenol polyoxyethylene ether.

The present application relates to the field of fluidized solidified soil, and discloses a kind of high-flow self-compacting fluidized solidified soil and its preparation process, including dry base engineering slag soil, mixing water, sodium hexametaphosphate, L (+) -tartaric acid, composite cementitious material, warm rubber dry powder and isoamyl alcohol polyoxyethylene ether polycarboxylic acid water reducing agent are made.The composite cementitious material is premixed with warm rubber dry powder;Slag soil is mixed with water and sodium hexametaphosphate to disperse internal mud group;Under continuous stirring, add tartaric acid aqueous solution, control the drop amount by using real-time monitoring of liquid phase pH value and closed-loop mechanism of tartaric acid consumption ratio, neutralize alkaline and inhibit early hydration heat release of cementitious material;Finally, add powder and water reducing agent for secondary stirring, and discharge and pour when liquid phase pH value jumps.The present application overcomes the hydration out of control caused by the fluctuation of different slag components through chemical synergy and dynamic feeding feedback of multiple components, avoids settlement stratification and bleeding, and ensures the stable development of high-flow state and later mechanical strength of slurry.

The present invention relates to a method for the preparation of 3-methyl-3-butene-1-ol (isoprenol), comprising the steps of preparing isobutylene (also: isobutene, 2-methylpropene) by contacting 3-methylbutan-1-ol (isoamyl alcohol) to a catalyst comprising at least one catalytically active metal and reacting at least one formaldehyde source and the isobutylene obtained in step a-i) to obtain isoprenol. Furthermore, the present invention refers to processes for the preparation of 3-methyl-2-butene-1-ol (prenol), of 3-methyl-3-butenal (isoprenal), of 3-methyl-2-butenal (prenal), and of 3,7-dimethy l-octa-2, 6-dienal (citral) and further downstream products comprising the use of isoprenol of the present invention and the resulting products and product streams.

The application relates to the field of building materials and discloses a sound and heat insulation light building material and a preparation method thereof. The light building material comprises cement, fly ash, river sand, quartz sand, a foaming agent, a modified composite filler-based water reducing agent and water. The foaming agent is made of sodium dodecyl sulfate, hydroxypropyl methyl cellulose, modified nano-aluminum oxide and nano-silicon dioxide. The modified nano-aluminum oxide is prepared by the following steps: reacting oleic acid with nano-aluminum oxide, emulsifying through a Pickering emulsion method, and selectively dissociating through a saponification reaction induced by sodium hydroxide. The modified composite filler-based water reducing agent is prepared by the following steps: in-situ esterification modification of a composite filler made by grafting isoprenyl alcohol polyoxyethylene ether on graphene oxide and carbon fiber, and then free radical copolymerization with acrylic acid. The light building material prepared by the application has high compressive strength and flexural strength, small water absorption and good heat insulation performance.

This invention belongs to the field of synthetic biology and microbial engineering, and discloses a chemical-biological method for preparing the isopentenyl bibenzyl compound 2-isopentenyl-3,3',4',5-tetrahydroxybibenzyl (NPB-1575) which has anti-ischemic stroke activity. The specific disclosed method includes: (1) chemically synthesizing the substrate dihydropiperidine; (2) constructing an engineered Escherichia coli strain based on the isopentenyl utilization pathway, co-expressing hydroxyethylthiazol kinase, isopentenyl phosphokinase, isopentenyl pyrophosphate isomerase and specific isopentenyl transferase, and efficiently synthesizing the isopentenyl donor; (3) using this strain to catalyze dihydropiperidine in whole cells, the yield in a 200L fermenter can reach 2.54g / L, which is nearly 40 times higher than the existing method; (4) obtaining NPB-1575 with a purity >98.5% by macroporous adsorption resin and normal / reversed phase chromatography and recrystallization. This method uses readily available raw materials, involves simple steps, is environmentally friendly, and yields high purity, laying the foundation for the development of NPB-1575 as a new drug for ischemic stroke and showing significant application potential.

The application discloses a process for preparing 3-methyl-2-buten-1-al diisopentyl acetal by continuous reaction rectification. The process comprises the following steps: reacting and rectifying isopentenyl alcohol and isopentenyl aldehyde in a reaction rectification tower to prepare 3-methyl-2-buten-1-al diisopentyl acetal, characterized in that the content of 2-methyl-3-buten-2-al in the liquid phase of the third to fifth trays of the reaction rectification tower from bottom to top is less than or equal to 1 wt%. By the continuous reaction rectification process, the device can be stably operated for more than 7200 hours, and the economic benefit of the enterprise can be remarkably improved.

The invention belongs to the technical field of pipe pieces, and particularly relates to a composite prefabricated concrete pipe piece and a preparation method thereof. The composite prefabricated concrete duct piece comprises a duct piece body and a reinforcement cage arranged in the duct piece body, the duct piece body is made of a concrete material, and the concrete material comprises cement, a mineral admixture, coarse aggregate, fine aggregate, an early-strength polycarboxylate superplasticizer, a functional admixture and water. The early strength type polycarboxylate superplasticizer is prepared by taking the isopentenol polyoxyethylene ether, the triallyl phosphate, the L-vinylglycine and the acrylic acid as monomers, so that the early strength of concrete is improved; modified polypropylene fiber, lithium silicate and methyl cellulose are adopted to jointly form a functional admixture, hydroxyethyl methylacrylate is grafted to the surface of the polypropylene fiber, and the anti-cracking performance, the anti-seepage performance and the mechanical performance of the concrete are improved.

The application provides a method for synthesizing 3-methyl-2-buten-1-ol, and belongs to the technical field of isopentenol synthesis. The method comprises the following steps: introducing 3-methyl-3-buten-1-ol and an atmosphere containing hydrogen into a fixed bed reactor, and performing a hydrogenation isomerization reaction under the action of a Pd / Al2O3 catalyst to generate 3-methyl-2-buten-1-ol; wherein the content of formaldehyde in the 3-methyl-3-buten-1-ol is 0.03-0.15%. The application adopts a fixed bed reactor to perform continuous production, adopts a Pd / Al2O3 catalyst with low palladium content as the catalyst, the preparation method is simple, the price is relatively low, and the content of formaldehyde in the 3-methyl-3-buten-1-ol is controlled to inhibit a side reaction, so that the reaction conversion rate and the product selectivity are high.

The application provides an acid anhydride low-sensitivity polycarboxylic acid water reducing agent and a preparation method and application thereof, an intermediate is prepared by alcoholysis of maleic anhydride and ring-opening polymerization of maleic acid monoester and ethylene oxide, the carboxyl in the maleic acid ester is esterified by ethylene oxide, a part of carboxylic acid is protected, crosslinking of the main chain is prevented, and then the polymer quality is improved to prevent the generation of later-stage precipitation; and the esterification protects the carboxyl, further improves the slump flow retention performance, makes the slump flow retention agent content lower in the application process of the water reducing agent, and the effect is more obvious. Compared with the prior art, the isopentenyl alcohol polyoxyethylene ether is copolymerized with maleic anhydride and a functional monomer of the maleic anhydride to synthesize a high-conversion-rate low-sensitivity viscosity-reducing mother liquor, the solid content of the base liquid and the catalyst dosage are adjusted, so that the application can occur the polymerization reaction at normal temperature, and the energy consumption is low at normal temperature. The intermediate after functionalization of the maleic anhydride is used to participate in the free radical polymerization reaction, and the monomer conversion rate of the reaction product is generally higher than 80%.

The present disclosure relates to an improved method for regiospecific and stereospecific synthesis of polyisopentenyl compounds. More particularly, it discloses regiospecific and stereospecific synthesis of (2E, 6E, 10E, 14E, 18E, 22E)-3, 7, 11, 15, 19, 23, 27-heptamethyl octacosa-2, 6, 10, 14, 18, 22, 26 heptaen-1-ol useful for the synthesis of vitamin K2-7.

This invention discloses a method for preparing optically active citronellol, comprising the following steps: preparing optically active R-citronellol by asymmetric hydrogenation of neraldehyde and / or geranialdehyde in the presence of a catalyst, wherein the catalyst comprises a transition metal rhodium and a bisphosphine ligand, wherein the mass of isopentenol in the raw material neraldehyde or geranialdehyde is 100-500 ppm of the mass of neraldehyde or geranialdehyde, and the mass of 3,7-dimethyl-2,6-octadienoic acid is 500-1000 ppm of the mass of neraldehyde or geranialdehyde; the preparation method of this invention can significantly improve the catalytic stability of optically active transition metal catalysts used for homogeneous catalysis and asymmetric hydrogenation, yielding R-citronellol with high optical purity, while simplifying the process flow, avoiding the introduction of new impurities, and exhibiting significant economic benefits.

The invention discloses a method for increasing the yield of yeast terpenoids through trace isopentenol synergistic enhanced two-phase fermentation, and belongs to the fields of industrial microbial fermentation, synthetic biology and metabolic engineering. Through the synergistic effect, the total yield of the terpenoids has a qualitative leap compared with that of a traditional single two-phase fermentation system. According to the method, the cell membrane permeability can be actively increased by utilizing the isopentenol at low concentration for the first time. According to the method, only one step of simple operation is added on the basis of an existing mature two-phase fermentation process, complex gene modification or equipment investment is not needed, and the industrial application prospect is wide. The method can effectively relieve product feedback inhibition, significantly improve the yield and simplify downstream extraction, and is mainly used for microbial fermentation production of terpenoids. The invention creatively expands the isopentenol from a pure metabolic substrate to a permeable membrane regulating agent in a specific scene, and opens up a new field for the application of the substance.

The invention relates to the field of tunnel engineering materials, and particularly discloses a tunnel double-liquid grouting material stabilizer and a preparation method and application thereof. The tunnel double-liquid grouting material stabilizer comprises the following raw materials: a water reducing agent and cellulose in a weight ratio of (2.1-2.6): (3-4), and the water reducing agent is prepared by the following steps: mixing isopentenol polyoxyethylene ether, acrylic acid and vinyltriethoxysilane in a weight ratio of 75: (5.4-8.1): (3.1-12.4), and reacting at 40-45 DEG C to obtain the water reducing agent; the preparation method comprises the step of blending the water reducing agent and the cellulose to obtain the stabilizing agent for the tunnel double-liquid grouting material. The product provided by the invention, cement, bentonite, water glass and water form the tunnel double-liquid grouting material with good stability, flow rate and stone rate.

The invention relates to a process for the preparation of 3-methyl-2-butenal (isopentenal), for the preparation of 3-methyl-2-buten-1-ol (isopentenol), for the preparation of diisopentenyl acetic acid esters for the preparation of isopentenal, and for the preparation of 3, 7-dimethyl-oct-2, 6-dienal (citral), in particular to a process for the preparation of 3, 7-dimethyl-oct-2, 6-dienal. Wherein the aldehyde content in the one or more reactant streams is maintained below a threshold. Furthermore, the present invention relates to product streams of isopentenal, isopentenol, diisopentenyl acetate of isopentenal, and citral, which can be obtained.

The invention provides a pH / salt / temperature multi-response type polyether water-based drilling fluid filtrate reducer as well as a preparation method and application thereof. The filtrate reducer is prepared from the following raw materials in parts by mass: 3 to 10 parts of acrylic acid, 1 to 10 parts of acrylamide, 2 to 15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 to 20 parts of sodium p-styrenesulfonate, 5 to 20 parts of dimethylaminoethyl methacrylate, 1 to 15 parts of isopentenol polyoxyethylene ether, 0.1 to 1 part of an initiator A, 0.1 to 0.8 part of an initiator B and 100 to 140 parts of water. The synergistic effect of multiple groups in the filtrate reducer can optimize the mud cake structure and reduce the filter loss, synchronous stability of the rheological property and filter loss control of drilling fluid under the triple environmental factors of pH / salt / temperature can be achieved, and the complex drilling requirements of deep layers and CO2-containing gas reservoirs are met.

The invention relates to the technical field of concrete, and discloses a triethanolamine-containing concrete tackifier and a preparation method thereof, the triethanolamine-containing concrete tackifier comprises the following components by weight: 20-25 parts of a tackifying polymer, 0.4-0.6 part of triethanolamine, 2-4 parts of modified cellulose, 0.1-0.3 part of calcium formate, and 0.2-0.3 part of sodium gluconate. Wherein the tackifying polymer is prepared by copolymerizing isopentenol polyoxyethylene ether, N, N-dimethylacrylamide and acrylic acid; the modified cellulose is obtained through oxidation, tertiary amino modification and quaternization, and the dispersity and compatibility of the cellulose are remarkably improved. The tackifier effectively solves the problems of segregation and bleeding caused by insufficient viscosity of traditional concrete, has a synergistic effect with a polycarboxylate superplasticizer, improves workability and pumpability, and is suitable for high-rise buildings and large-span projects.

The invention is suitable for the field of concrete admixtures, and discloses a water reducing agent for inhibiting concrete bleeding and a preparation method thereof, the water reducing agent comprises the following components: isopentenol polyoxyethylene, acrylic acid, a functional monomer, N, N-methylene bisacrylamide, a coupling agent, an oxidizing agent, a reducing agent and the balance of water; wherein the functional monomer comprises an amide monomer and a sulfonic acid monomer, the coupling agent contains polyether polyol dimethacrylate, the coupling agent can be subjected to a cross-linking reaction with other components to form a moderate cross-linked structure, and the structure can significantly reduce the bleeding phenomenon of concrete and improve the homogeneity and compactness of the concrete; finally, the working performance, the mechanical property and the durability of the concrete are obviously improved.

This invention discloses a two-system composite water-reducing agent containing polycarboxylate for concrete and its preparation method, belonging to the field of building material admixture processing technology. The two-system composite water-reducing agent for concrete includes component A and component B; component A is a passivating agent for acidic soil; component B is a polycarboxylate water-reducing agent mother liquor with a pH of 7-7.5; the amount of component A is 5%-10% of the mass of component B; component A includes a boric acid-modified MXene / chitosan, a sodium alginate-coated ammonium-modified polyacrylic acid polymer composite, an organotin catalyst, or an organic base catalyst; wherein the sodium alginate in the sodium alginate-coated ammonium-modified polyacrylic acid polymer composite is isocyanate cross-linked modified sodium alginate; component B includes a polymer prepared using isopentenyl alcohol polyoxyethylene ether, isomeric ester, acrylic acid, and itaconic acid as monomers, and alkylamide betaine. This application is applicable to concrete systems containing acidic soil.

The application discloses an admixture for solving the blackening of concrete slurry and a preparation method thereof. The admixture is prepared from the following raw materials: iso-pentenyl alcohol polyoxyethylene ether, deionized water, sodium methallyl sulfonate, acrylic acid, maleic anhydride, ammonium persulfate, a fatty alcohol and ethylene oxide condensate, polyethylene glycol monooctyl phenyl ether and 740 defoaming agent. The preparation method comprises the following steps: adding iso-pentenyl alcohol polyoxyethylene ether, deionized water and sodium methallyl sulfonate into a reaction kettle, adjusting the rotating speed, heating the reaction kettle, dropping A liquid and B liquid, making the A liquid drop for 3 hours, making the B liquid drop for 3.5 hours, constant temperature stirring, cooling to normal temperature, then adding the remaining fatty alcohol and ethylene oxide condensate and other raw materials into the reaction kettle, and stirring to obtain the admixture. The admixture can be mixed in the concrete, can quickly solve the blackening problem of the slurry, and is widely applied in the fields of civil engineering, water conservancy engineering, underground engineering, road engineering, bridge engineering and the like.

The application provides a drilling fluid anti-carbon dioxide pollution diluent and a preparation method and application thereof. The drilling fluid anti-carbon dioxide pollution diluent is prepared from the following raw materials in parts by mass: 10-20 parts of acrylic acid (AA), 5-15 parts of sodium p-styrenesulfonate (SSS), 1-5 parts of N-vinylpyrrolidone (NVP), 45-55 parts of isoamyl alcohol polyoxyethylene ether, 0.01-0.1 parts of an initiator, and 100-140 parts of water. The diluent can solve the problems of thickening of the drilling fluid, increase of the viscosity and shear force, and increase of the filtration loss after CO2 pollution, and is applied to the CO2-polluted drilling fluid, so that the viscosity and shear force of the CO2-polluted drilling fluid can be effectively reduced, and the filtration loss of the drilling fluid can be reduced.

The invention relates to an oil well exploitation auxiliary agent, in particular to a high-temperature-resistant drag reducer for well cementation cement and a preparation method of the high-temperature-resistant drag reducer, and the high-temperature-resistant drag reducer comprises the following components in parts by weight: 1-15 parts of 2-acryloyloxybutyl sulfonic acid, 5-20 parts of acrylic acid and 10-30 parts of isopentenol polyoxyethylene ether. The method has the beneficial effects that the drag reduction effect is good, and the economical efficiency is good; the effects of fast solidification at low temperature and still good dispersion effect at high temperature are achieved; the method can be used in different stratums.

The application relates to the field of building materials and discloses modified limestone as well as a preparation method and application thereof, the modified limestone is prepared by using octamethylcyclotetrasiloxane, tetraethyl orthosilicate and gamma-methacryloyloxypropyl trimethoxysilane as organosilicon monomers, double bond limestone, isoamyl alcohol polyoxyethylene ether and acrylic monomers performing free radical copolymerization, initiating copolymerization of the double bonds on the limestone surface, the double bonds on the solution three hybrid emulsion microparticles, the isoamyl alcohol polyoxyethylene ether and the acrylic monomers, and firmly fixing the polymer shell layer on the limestone surface through chemical bonding to prepare coated limestone, and then using phosphoric acid, triethanolamine, aluminum hydroxide and the coated limestone as raw materials to prepare the modified limestone, the prepared modified limestone is applied to concrete, excellent compressive strength and durability are given to the concrete, and the concrete has good impermeability and fluidity.

The application provides a saccharomyces cerevisiae engineering bacterium for producing squalene through endogenous and artificial synthetic pathways and an application thereof, the saccharomyces cerevisiae engineering bacterium takes ZS00 strain as a starting strain, overexpresses acetyl coenzyme A acetyltransferase gene, hydroxymethylglutaryl coenzyme A synthase gene and N-terminal truncated hydroxymethylglutaryl coenzyme A reductase gene, and effectively improves the yield of squalene. Heterologous expression of mevalonate kinase gene and mevalonate pyrophosphate decarboxylase gene, overexpression of the key gene squalene synthase gene for promoting the conversion of precursors into squalene effectively promotes the synthesis of squalene. The introduction of isopentenol utilization pathway genes and their mutants, through the regulation of IU pathway key substrate, overexpression of isopentenyl pyrophosphate isomerase gene and farnesyl pyrophosphate synthase gene, the final strain can effectively accumulate squalene to 687.93 mg / L. The application realizes the breakthrough of squalene yield and efficiency through complementation and synergistic effect.

This invention relates to the field of concrete admixture technology, specifically to a high-performance polycarboxylate superplasticizer and its preparation process. The preparation process of a high-performance polycarboxylate superplasticizer includes: preparing a graphene composite material; preparing a modified graphene composite material; preparing modified phosphate-esterified starch; and preparing the polycarboxylate superplasticizer. This invention uses sodium dihydrogen phosphate and disodium hydrogen phosphate as esterifying agents, urea as an esterification catalyst and penetrant, to covalently graft phosphate functional groups onto the macromolecular chains of corn starch to form a phosphate-esterified starch emulsion. Glycidyl methacrylate is then added for reaction to obtain double-bond modified phosphate-esterified starch. Finally, this starch is copolymerized with isopentenyl alcohol polyoxyethylene ether and other substances in an aqueous phase to produce a polycarboxylate superplasticizer. This process enables sustained anchoring and slow release of dispersion capabilities, continuously breaking down cement particle agglomerates, thereby significantly improving the slump retention capacity of concrete paste.

The invention belongs to the technical field of microorganisms, and particularly relates to gluconobacter oxydans and application thereof. The strain ZLV2-2 is classified and named as Gluconobacter oxydans, the Gluconobacter oxydans is preserved in China General Microbiological Culture Collection Center (CGMCC) on October 29, 2025, and the preservation number is CGMCC NO.36411. The strain ZLV2-2 is named as Gluconobacter oxydans. The Gluconobacter oxydans ZLV2-2 provided by the invention has strong genetic stability, can efficiently ferment and convert isopentenol to synthesize isopentenoic acid, has a wide action substrate spectrum, also has a good conversion effect on primary alcohols such as n-propanol and n-butanol, and has industrial application potential; the method is simple in production process, mild in condition, green and safe, avoids the problems of high energy consumption and environmental pollution of a traditional chemical method, has few by-products, and is beneficial to extraction and separation operation.

The invention provides modified block silicone oil as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The modified block silicone oil is prepared by carrying out ring-opening addition reaction on amino-terminated silicone oil and isopentenol polyoxyethylene ether glycidyl ether in the presence of a basic catalyst. A plurality of isopentenol polyoxyethylene ether chain segments are covalently grafted to a silicone oil main chain through ether bonds by utilizing a reaction of an epoxy group and a primary amine group to generate a novel organic silicon macromolecule with a block structure, and the macromolecule simultaneously retains a free radical polymerization double bond at the tail end of isopentenol, so that the organic silicon macromolecule has a high molecular weight. The copolymer can be used as a macromonomer to participate in subsequent emulsion polymerization; the molecular structure has the hydrophilicity of a polyether chain segment and the hydrophobicity of an organic silicon chain segment.

The invention belongs to the technical field of organic synthesis, and particularly discloses a method for synthesizing neroli through 4-methyl-4-[(3-methylbutyl-3-alkene-1-yl) oxy]-2-(2-methylpropyl-1-alkene-1-yl) oxacyclohexane. The method comprises the following steps: taking 4-methyl-4-[(3-methylbutyl-3-alkene-1-yl) oxy]-2-(2-methylpropyl-1-alkene-1-yl) oxacyclohexane as a raw material; comprising the following steps: uniformly mixing 4-methyl-4-[(3-methylbutyl-3-alkene-1-yl) oxy]-2-(2-methylpropyl-1-alkene-1-yl) oxacyclohexane with a solvent, preheating, pumping the mixture into a fixed bed reactor filled with a SO42-Fe2O3-La2O3 / SBA-15 solid acid catalyst at a certain flow rate, reacting for a period of time at a certain temperature and pressure, filtering, washing, and drying to obtain the 4-methyl-4-[(3-methylbutyl-3-alkene-1-yl) oxy]-2-(2-methylpropyl-1-alkene-1-yl) oxacyclohexane. After the reaction, cooling through a condenser to obtain a reaction crude product, and rectifying the crude product to obtain a neroli ether product and an isopentenol byproduct; the synthesis method disclosed by the invention is relatively mild in reaction condition, high in reaction speed and high in production efficiency, no wastewater is generated in reaction post-treatment, the solvent and the catalyst can be recycled for the next batch after being recycled, the production cost is greatly reduced, and industrial production is easy to realize. Meanwhile, by-products are utilized, and the production cost of nerolin is reduced.

The application provides a method for preparing isoamylene alcohol from 3-methyl-1-butene, which comprises: oxidizing 3-methyl-1-butene to obtain a 2-isopropyl oxirane intermediate, and then isomerizing the intermediate to obtain isoamylene alcohol. The synthetic route is novel, 3-methyl-1-butene, a cheap by-product of refining C5, is used as a starting material, and isoamylene alcohol is prepared through two-step reactions of epoxidation and isomerization, which is simple and efficient, and an economic and feasible route for preparing the product is provided. In the second step of isomerization, lithium phosphate treated by sodium alcohol or potassium alcohol is used as a catalyst to efficiently realize the isomerization of the epoxy intermediate, and isoamylene alcohol is conveniently and quickly prepared.

The invention discloses a delayed coagulation enhanced graphene-polycarboxylic acid composite water reducing agent and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a hydrolysate of gamma-methacryloxypropyltrimethoxysilane; (2) preparing a low-oxygen-content graphene dispersion liquid, and adding the hydrolysate obtained in the step (1) into the low-oxygen-content graphene dispersion liquid; reacting and drying to obtain functionalized graphene of which the surface is grafted with polymerizable double bonds; (3) heating and dissolving the isopentenol polyoxyethylene ether macromonomer and water to obtain a solution 1; (4) dropwise adding the solution A, the solution B and the solution C into the solution 1; and (5) preserving heat and curing, and cooling to room temperature to obtain the delayed coagulation enhanced graphene-polycarboxylic acid composite water reducing agent. The composite water reducing agent disclosed by the invention shows a controllable retarding effect, can more efficiently improve the compressive strength and the breaking strength of a cement-based material, is mild in reaction condition, does not need special equipment, and is suitable for technical transformation and upgrading of an existing polycarboxylate water reducing agent production line.

The invention relates to the field of lily pyran production, and discloses a synthesis process of lily pyran, which comprises isopentenol, isovaleraldehyde and an acid catalyst solution, the proportion of the isopentenol is 0.90-1.05, the proportion of the isovaleraldehyde is 1.0, and the proportion of the acid catalyst solution is 0.2-0.7; the acid catalyst solution comprises an organic acid or inorganic acid solution, and isopentenol is used as one of core raw materials of the reaction, provides an olefin structural unit, and forms a pyran ring skeleton of convallaria majalis pyran through Prins cyclization reaction with isovaleraldehyde. According to the invention, the microreactor and the micromixer cooperate to realize rapid and uniform mixing and efficient mass transfer of the raw materials, the reaction retention time is only 8-21 minutes, the whole process takes 2-4 hours, and the time is greatly shortened compared with the traditional intermittent reaction; the yield of isovaleraldehyde reaches 80.6%-83.4%, the conversion rate of isopentenol reaches 96.8%-98.1%, the purity of a crude product is 85%-90%, the purity of a refined finished product is larger than or equal to 99%, and the problems that a traditional process is low in efficiency and insufficient in purity are solved.