716 results about "Chain transfer" patented technology

The invention discloses a bionic lignin-based saline-alkali soil improvement material and a preparation method thereof, and belongs to the technical field of high polymer materials and soil improvement. According to the saline-alkali soil improving material, lignin or a derivative thereof serves as a framework, glutenin charge distribution and a dynamic disulfide bond sodium ion response function are simulated, and the sequence and the proportion of chain segments of sulfonic acid groups and quaternary ammonium salt groups are accurately regulated and controlled through step-by-step activation and alternate copolymerization in an aqueous solution polymerization reaction system; positive and negative charges form more uniform sequence distribution, so that the amphipathy of the lignin compound is realized; then, sulfydryl is introduced through click chemistry, linear regulation and control of material viscosity and water solubility are achieved through the chain transfer characteristic of multi-sulfydryl functional groups, and the requirements of different saline-alkali soil application scenes are met. The limitation that a traditional lignin product is single in function is broken through, efficient utilization of lignin is achieved, and the intelligent saline-alkali soil improvement material integrating high stability and pH and Na < + > multi-environment response is developed.

The invention discloses a special grinding aid for gold ore and a preparation method thereof, and belongs to the technical field of mineral processing, the special grinding aid for gold ore comprises the following raw materials: a monomer, an initiator, a chain transfer agent and a solvent; the monomers are an unsaturated polyether monomer A and an unsaturated carboxylic acid monomer B; or a monomer C containing an ethylenically unsaturated sulfonic acid group. The preparation method comprises the following steps: putting the raw materials into a water bath kettle, and polymerizing in a separate dropwise adding manner to prepare the special grinding aid for the gold ore. The prepared grinding aid can improve the problems of particle agglomeration, low fine grinding efficiency, low gold dissociation efficiency and the like in the gold ore grinding process, the concentrated utilization of the grinding aid limited in the fields of cement, ceramics and the like is improved, the grinding energy consumption can be reduced, and the material quality can be improved.

The invention relates to a dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. A preparation method of dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber comprises the following steps: S1, mixing acrylonitrile, a comonomer, a chain transfer agent, an initiator and a solvent, carrying out polymerization reaction through a solvent dropwise addition method, and preparing a spinning solution; wherein the comonomers comprise a first comonomer, a second comonomer and a third comonomer; s2, the spinning solution is subjected to solidification, water washing, water drawing, oiling, drying and steam drawing, and precursor fibers are obtained; s3, the precursor fiber is sequentially subjected to pre-oxidation, low-temperature carbonization, high-temperature carbonization, graphitization, surface treatment, sizing and drying, and the ultra-high-performance polyacrylonitrile-based carbon fiber is prepared. Wherein the pre-oxidation adopts four-stage pre-oxidation treatment. The strength and modulus of the carbon fiber can be effectively and synergistically optimized, and the carbon fiber with high strength and high modulus is prepared.

Disclosed in the present invention is a composition for preparing a vinyl block copolymer, the composition comprising: a first monomer ethylene, a second monomer a C3-C20 α-olefin and at least one regulation monomer, the regulation monomer being an olefin or a substituted olefin with the C atom number greater than 3, or styrene / a styrene derivative, and in the same composition, the second monomer being different from the regulation monomer. The composition is catalyzed by a main catalyst and a co-catalyst to obtain the vinyl block copolymer, wherein the main catalyst is a complex L-MR1R2R3 that contains three substituents and that is formed by an IVB-group metal and a monoanionic ligand, and the co-catalyst includes alkyl aluminum, polymerized or oligomerized aluminoxane, a neutral Lewis acid, a non-polymer, a non-coordinated ionic compound, or a mixture of two or more described above. Provided in the present invention is a composition capable of obtaining a lower-olefin block copolymer, the composition can obtain a lower-olefin block copolymer without the need of replenishing monomers or adding a chain transfer reagent for polymerization during polymerization processes, so that a production process is simple and involves low cost.

The disclosure relates to block copolymer nanoparticles for therapeutic delivery of nucleic acids, and methods therefor. More particularly, the invention relates to polymer nanoparticles, such as reversible addition-fragmentation chain transfer (RAFT) polymer compositions, for delivering miRNAs.

The application discloses a PAG bonding type photosensitive photoresist resin and a preparation method and application thereof. The photoresist resin is as follows: formula. The PAG bonding type resin is prepared through the following reaction process: 1) performing a RAFT polymerization reaction on p-acetoxystyrene, p-styrene sulfonamide trifluoromethyl potassium salt and a RAFT chain transfer agent under the action of an initiator to obtain an intermediate I, 2) performing a hydrolysis reaction on the intermediate I to obtain an intermediate II, 3) performing a protection group introduction reaction on the intermediate II and di-tert-butyl dicarbonate to obtain an intermediate III; and 4) performing an ion exchange reaction on the intermediate III and triphenylsulfonium bromide. The application realizes the bonding of the PAG into the resin skeleton, and improves the problems of poor compatibility between the PAG and the resin, phase separation, uneven distribution of the PAG and the like. Therefore, the photoresist prepared from the resin has the photo-generated acid bound by the polymer main chain and limited diffusion, the resolution is improved, and the photoetching effect is excellent.

The invention provides an ester-ether copolymerization type slump-retaining polycarboxylic acid water reducer and a preparation method of the ester-ether copolymerization type slump-retaining polycarboxylic acid water reducer. The water reducing agent is prepared from the following raw materials in parts by weight: 80 to 120 parts of main chain macromonomer, 20 to 35 parts of unsaturated carboxylic acid, 1.5 to 3.2 parts of initiator, 0.2 to 0.5 part of reducing agent, 0.3 to 0.8 part of chain transfer agent, 8 to 15 parts of neutralizer, 200 to 300 parts of solvent, 5 to 10 parts of diphosphonic polyether monomer, 3 to 6 parts of temperature-sensitive dynamic crosslinking monomer and 2 to 5 parts of amide-ether bond grafting monomer. The water reducer has the comprehensive performance of dispersion, slump loss resistance, mud resistance, high-temperature response and the like.

The invention relates to polymer nanoparticle and DNA nanostructure delivery compositions for non-viral delivery, and methods therefor. More particularly, the invention relates to polymer nanoparticle delivery compositions, such as reversible addition-fragmentation chain transfer (RAFT) polymer compositions, and DNA nanostructure delivery compositions, such as DNA origami compositions, for the delivery of more than one payload, or for the delivery of a nucleic acid construct payload of 3 kB or more, and methods therefor.

The invention relates to the technical field of admixtures for cement concrete, in particular to a polycarboxylic acid admixture for enhancing low-activity admixtures and a preparation method thereof, the polycarboxylic acid admixture is formed by polymerizing the following components: polyether macromonomer, unsaturated carboxylic acid I, exciting functional monomer A, slump retaining functional monomer B, rheological functional monomer C, oxidizing agent, reducing agent, chain transfer agent and water; the exciting functional monomer A, the slump retaining functional monomer B and the rheological functional monomer C are sequentially added, and the exciting functional monomer A is formed by polymerizing polyhydric alcohol, unsaturated carboxylic acid II, an initiator, phosphonic acid and an alcohol amine small monomer. Through molecular design, key functional groups such as phosphonic acid groups, amino groups and sulfonic acid groups are innovatively introduced into a polycarboxylic acid main chain, so that the polycarboxylic acid admixture has multiple synergistic functions of reducing the cement consumption, effectively activating a low-activity cementing material, stably improving the working performance of concrete and the like.

The invention relates to the technical field of concrete admixtures, in particular to a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof. The viscosity reduction type polycarboxylate superplasticizer is formed by polymerizing a comonomer under the action of an oxidizing agent, a reducing agent and a chain transfer agent, the comonomer comprises methoxyallyl polyoxyethylene ether, an air-entraining functional monomer, a viscosity-reducing functional monomer, a silicon-containing functional monomer, unsaturated acid and ferrous sulfate. The polycarboxylate superplasticizer provided by the invention can effectively reduce the viscosity of concrete, so that a concrete mixture has good flowability, workability and wrapping property, meanwhile, the strength of the concrete is not influenced as far as possible, the strength of the concrete is kept at a good level, and the concrete keeps good constructability. Moreover, when the viscosity-reducing polycarboxylate superplasticizer is prepared, the reaction can be completed at the normal pressure of 20-25 DEG C, the preparation steps are simple, the reaction condition is mild, no toxic gas is released, energy can be effectively saved, and the viscosity-reducing polycarboxylate superplasticizer meets the green building material standard.

The disclosure relates to block copolymer nanoparticles for therapeutic delivery of nucleotides, and methods therefor. More particularly, the invention relates to polymer nanoparticles, such as reversible addition-fragmentation chain transfer (RAFT) polymer compositions, for delivering miRNAs.

The invention discloses chain end modified liquid rubber, mixed rubber, a preparation process, a tire and a vehicle, and belongs to the technical field of liquid rubber and manufacturing thereof. According to the liquid rubber, butadiene monomers and a chain transfer agent are added in batches in the preparation process, negative ion active centers are frequently transferred to the chain transfer agent from the tail end of a polybutadiene-based lithium active chain to form new initiation growth centers, then newly introduced butadiene monomers are initiated to grow, the dosage of an n-butyllithium initiator is remarkably reduced, and the stability of the liquid rubber is improved. The production cost is greatly reduced, the generation of sewage is greatly avoided, the monomer concentration of the final rubber product can reach about 80 percent by weight, the productivity is improved, and large-scale production is facilitated; the rubber also enables the filler to have good dispersibility, and has good compatibility with base rubber such as styrene butadiene rubber, natural rubber and the like.

The application provides a solid waste-based high-fluidity filling material and a preparation method thereof. The solid waste-based filling material comprises 40-60 parts of Bayer red mud, 40-60 parts of fly ash, 10-20 parts of desulfurization gypsum, 3-5 parts of a pumping agent, 30-60 parts of water, and the pumping agent is a compounded product of an organic silicon polycarboxylic acid water reducing agent, a polymaleic acid and a water-soluble cellulose at a mass ratio of 3-5:3-5:10. The organic silicon polycarboxylic acid water reducing agent is copolymerized from an unsaturated carboxylic acid monomer, a polyethylene glycol monoallyl ether and an unsaturated silane monomer at a mass ratio of 1.5-2:2-4:0.8-1 in the presence of a chain transfer agent. The silane monomer forms a hydrophobic region, and through the balance of the hydrophilic and hydrophobic region structure, the electrostatic repulsion between the solid waste gel particles with the water reducing agent adsorbed on the surface is enhanced, the occurrence of the solid waste gel particles wrapping the water reducing agent is prevented, and the slurry fluidity and the filling material strength are improved.

The invention relates to the technical field of cement admixtures, in particular to a preparation process of an environment-friendly cement raw material grinding-aid grinding agent. According to the process, electrolytic manganese residues and industrial waste alkali liquor are used as raw materials, and the core is that multi-step synergistic chemical modification is performed: firstly, the electrolytic manganese residues are subjected to low-temperature plasma activation pretreatment to increase surface active sites; secondly, carrying out graft copolymerization on lignin in the industrial waste alkali liquor by utilizing an RAFT (Reversible Addition-Fragmentation Chain Transfer) polymerization technology, and introducing carboxyl and amide groups to synthesize a zwitterionic polymer; then, mixing the modified electrolytic manganese residues with modified alkali liquor, and inducing to generate a nano precursor with a core-shell structure through a supramolecular self-assembly and bionic silicification principle; and finally, carrying out spray drying to obtain a final product. According to the mineralizer disclosed by the invention, the grindability and the burnability of cement raw materials can be remarkably improved, the clinker burning coal consumption can be reduced, more importantly, marine cement can be endowed with excellent chloride ion penetration resistance, and meanwhile, high-added-value resource utilization of solid wastes is realized.

The invention discloses an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer and a preparation method thereof, and belongs to the field of polymers. Comprising the following steps: putting a mixture containing an initiator, a chain transfer agent, a solvent and vinyl acetate into a closed container, introducing ethylene gas, and carrying out pressurized polymerization to obtain the ethylene-vinyl acetate copolymer, the initiator is selected from at least one of lauroyl peroxide, benzoyl peroxide, azodiisobutyronitrile and azobisisoheptonitrile; the chain transfer agent is selected from the group consisting of 2-dimethylaminoethyl acetate and / or 2-dimethylaminoethyl propionate. The preparation method of the low-branching-degree EVA has the characteristics of mild conditions, strong controllability, simplicity in operation and large-scale application prospect. The invention also provides an ethylene-vinyl alcohol copolymer prepared from the prepared EVA through alcoholysis reaction, and the ethylene-vinyl alcohol copolymer has the characteristics of high molecular weight, narrow distribution, good appearance and the like, and meets the application requirements of commercial EVOH.

The invention provides a preparation method and application of novel acrylic continuous pre-polymerized resin. The preparation method comprises the following steps: preheating an MMA solution containing azodiisobutyronitrile to 50-60 DEG C, and enabling the preheated MMA solution to flow into the microreactor main body; the pure MMA is preheated to 90-95 DEG C and then flows into the microreactor main body; and mixing the inflowing materials, controlling the reaction temperature to be 120-130 DEG C, the pressure to be 0.2-0.3 MPa and the retention time to be 5-15 minutes, and carrying out continuous polymerization reaction to prepare the PMMA prepolymer resin. According to the technology, accurate regulation and control of the molecular weight and distribution of the PMMA / MMA prepolymer are realized through a continuous process under high temperature and high pressure, and the goal can be achieved without depending on a chain transfer agent. The method is safe and controllable, the product of the method is perfectly compatible with a solid plane material curing system of'an initiator first and then an accelerant ', and the energy consumption and the safety risk are effectively reduced while the production efficiency and the productivity are remarkably improved.

The invention discloses a tensile and anti-crack concrete pole, which belongs to the technical field of concrete materials and comprises the following components in proportion: 380-450 kg / m < 3 > of cement, 20-40 kg / m < 3 > of silica fume, 50-80 kg / m < 3 > of fly ash, 1000-1150 kg / m < 3 > of broken stone, 650-750 kg / m < 3 > of sand, 0.5-1.5 kg / m < 3 > of synthetic fiber, 30-80 kg / m < 3 > of steel fiber, 130-160 kg / m < 3 > of water, 25-40 kg / m < 3 > of expanding agent and 4.5-7.5 kg / m < 3 > of multi-branched temperature-sensitive polycarboxylic acid superplasticizer. The multi-branched temperature-sensitive polycarboxylic acid high-efficiency water reducing agent is prepared by co-polymerizing a multi-branched chain transfer agent, a temperature-sensitive polymerizable monomer, acrylic acid and polyethylene glycol monomethyl ether acrylate, and has the advantages of excellent dispersion effect, high-temperature slump retaining property, few pores of an electric pole, high compactness and better tensile and anti-cracking properties.

The invention discloses an emulsion type low-temperature pressure-sensitive adhesive and a preparation method thereof, and the emulsion type low-temperature pressure-sensitive adhesive comprises the following components in parts by weight: 20 parts of alkyl acrylate soft monomer, 10-40 parts of alkoxy polyethylene glycol acrylate monomer, 0.1-0.5 part of functional monomer, 0.01-0.05 part of pH regulator, 0.01-0.05 part of chain transfer agent, 0.3-0.9 part of emulsifier, 0.05-0.3 part of initiator, 0.5-2 parts of rheological additive and 15-30 parts of water. The initial adhesion and low temperature resistance of the emulsion pressure-sensitive adhesive are greatly improved.

The invention discloses a perfluoropolyether-based polymer solid electrolyte film regulated and controlled by a mixed solvent as well as a preparation method and application of the perfluoropolyether-based polymer solid electrolyte film, and belongs to the field of organic polymer solid electrolyte preparation. Reacting under the action of an initiator and an RAFT (reversible addition-fragmentation chain transfer) reagent to obtain a perfluoropolyether-based copolymer; the method comprises the following steps: adding a perfluoropolyether-based copolymer into a polyvinylidene fluoride-hexafluoropropylene copolymer solution in which lithium salt is dissolved, the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, the mass of the N, N '-dimethylformamide, the mass of the trifluorotoluene and the mass of the perfluoropolyether-based copolymer account for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, and the perfluoropolyether-based polymer solid-state electrolyte film is obtained by uniformly mixing and then preparing a film. And the comprehensive performance of the composite solid electrolyte serving as the film is improved.

Provided is a graft copolymer in which a (meth)acrylic acid ester-based polymer block (A) that has a reactive silicon group and a hydrocarbon-based polymer block (B) are bonded in the order of A-B-A. The content of (meth)acrylic acid alkyl esters in which an alkyl has 4 or more carbon atoms is preferably not less than 10 wt% in the graft copolymer. The (meth)acrylic acid ester-based polymer block (A) includes a structural unit derived from a chain transfer agent (a2) having a mercapto group, and the molar ratio of the hydrocarbon-based polymer block (B) to the chain transfer agent (a2) having a mercapto group is preferably not less than 0.06.

The invention discloses an RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent as well as a preparation method and application thereof, and belongs to the technical field of RAFT reagent synthesis. The general formula of the RAFT reagent is shown in the specification, r1 to R5 are selected from any one of a hydrogen atom, a methyl group, a methoxyl group and a halogen atom; and R6 is selected from any one of alkyl ester groups of C3-C6. The RAFT reagent provided by the invention has a unique molecular structure, and shows excellent rapid light response characteristics, excellent initiation efficiency and relatively high triplet quantum yield. In the dynamic process, the polymer not only shows an extremely high polymerization rate, but also has excellent chain transfer capacity, and can be used for preparing acrylate and acrylamide polymers with narrower molecular weight distribution. Due to the characteristics, rapid curing of the resin can be realized, and the resin can be applied to the field of photocuring 3D printing.

The invention relates to the technical field of polycarbonate polyols, and discloses a preparation method of carbon dioxide-based polycarbonate polyols, which comprises the following steps: adding an epoxy compound, a carborane derivative catalyst, a chain initiator and a chain transfer agent into a reactor, introducing carbon dioxide to replace air in the reactor, and reacting to obtain the carbon dioxide-based polycarbonate polyols. Then pressurizing, heating and stirring to carry out polymerization reaction, adding acid to terminate the reaction after the reaction is completed, and then purifying and drying to obtain the polycarbonate polyol, wherein the carborane derivative catalyst is prepared by the following preparation method: adding different substituted alkynes, decaborane, ethyl sulfide and toluene into a reaction flask in proportion in a nitrogen atmosphere, sealing the reaction flask, and heating and stirring to enable the decaborane to react with the different substituted alkynes. According to the method, a specific catalyst is used for replacing a traditional catalyst, and the reaction efficiency and the product molecular weight can be improved.

The application relates to the technical field of C09D5 / 03, in particular to a high-transmittance acrylic powder resin and a preparation method thereof, raw materials for preparing the acrylic powder resin by weight percentage at least include: 80-100 parts of soft monomers, 400-600 parts of hard monomers, 0-10 parts of carboxyl functional monomers, 200-400 parts of ester functional monomers, 20-100 parts of hydroxyl functional monomers, 10-30 parts of initiators, 5-20 parts of chain transfer agents, 800-1200 parts of solvents and 1-10 parts of nano additives; the nano additives are added, and the synthesis process of the acrylic resin is optimized, so that the prepared acrylic powder resin has high transmittance and good weather resistance, and can meet the actual use requirements in the fields of automobile hubs and photovoltaics.

A composition for printing a three-dimensional siloxane structure includes a siloxane monomer having at least one silane functional group, a chain transfer agent, a hydrosilylation catalyst, a radical initiator, and a photo-oxidizing agent.

The invention belongs to the field of special adhesives, and discloses an all-polymer super-water-resistant UV pressure-sensitive adhesive capable of being rapidly cured and a formed pressure-sensitive adhesive tape. The pressure-sensitive adhesive is prepared by polymerizing a free radical thermal initiator, a chain transfer agent, an inert organic solvent and 100 parts by mass of (methyl) acrylate at 75-85 DEG C, heating, and carrying out reduced pressure distillation to remove the solvent. The pressure-sensitive adhesive is coated on a PET (polyethylene terephthalate) or BOPP (biaxially-oriented polypropylene) film base material in a hot melting manner or a solution manner, and is irradiated by ultraviolet light to obtain the formed pressure-sensitive adhesive tape. The prepared pressure-sensitive adhesive can be rapidly cured, and the cured pressure-sensitive adhesive tape also has relatively high peel strength, high holding power and stability, has no adhesive residue, and has a wide application prospect in humid and water environments.

The present invention proposes a method and use for stabilizing a simple agglomerate for pH and salt and with adjustable size. In phosphoric acid buffer solutions with different salt concentrations and pH values, the polyacrylic acid hydroxypropyl group condensation body has specific stability; hydrophobic thermal response blocks are introduced into a hydroxypropyl acrylate monomer through reversible addition-fragmentation chain transfer polymerization to regulate and control the size of a condensation body, and a phase separation behavior is shown at different temperatures; a hydrophobic block without thermal response is introduced to regulate and control the size of the aggregate, and no thermal response behavior is shown. Continuous regulation and control of the size of the aggregate from the micron level to the nano level are achieved, and the requirements of different application scenes are met. The hydroxypropyl polyacrylate condensation body can be used for packaging various dyes and drugs; high-efficiency enzyme protection is achieved, formed aggregates can protect glucose oxidase, and the retention rate of enzyme activity reaches 85% or above after treatment is conducted for 3 hours at 60 DEG C; as a micro-reactor for the reaction of generating p-nitrobenzaldehyde phenylhydrazone from p-nitrobenzaldehyde and phenylhydrazine, the reaction rate is greatly improved.

The present application provides a narrow molecular weight distribution PVP copolymer, and a preparation method therefor and a use thereof. The PVP copolymer has the structure represented by formula I. In the present application, NVP monomer and allyl polyoxyethylene ether are subjected to a copolymerization reaction in a redox system, and a sulfonating agent is then added to the resulting copolymer reaction solution to perform sulfonation treatment of the terminal hydroxyl groups, thereby obtaining the PVP copolymer. The present application utilizes the chain transfer effect of allyl polyether to achieve effective control of the molecular weight distribution of the PVP copolymer, and performs strongly polar ionized end-group treatment to improve the segment uniformity of the PVP copolymer. The spatial steric hindrance of the polyether side chains and the charge repulsion of the ionic groups significantly improve the adequacy of chain extension of PVP in the casting solution, so as to increase the exchange rate of the casting solvent and precipitant, and obtain a membrane pore structure with uniform pore size, high porosity, and stable structure.

The invention relates to the technical field of concrete admixtures, and particularly discloses a concrete super-plasticity-retaining retarder and a preparation method thereof. The concrete super-plasticity-retaining retarder is prepared from 100 to 200 parts of carboxyl / phosphonic acid group-containing unsaturated polyether monomer, 50 to 150 parts of phosphonic acid group-containing unsaturated monomer, 20 to 80 parts of acrylic acid, 1 to 5 parts of ammonium persulfate, 1 to 5 parts of ascorbic acid, 5 to 15 parts of chain transfer agent, 5 to 15 parts of nonionic polyurethane thickener, 1 to 2 parts of preservative and 600 to 800 parts of deionized water. According to the invention, the retarding effect and the stability when the retarder is used together with different types of water reducing agents can be improved.

The invention discloses efficient polyacrylamide with low ionic degree, which is prepared from the following raw materials in parts by weight: 85 to 95 parts of acrylamide monomer, 3 to 8 parts of anionic monomer, 1 to 3 parts of cationic monomer, 0.05 to 0.2 part of initiator, 0.01 to 0.05 part of chain transfer agent, 0.005 to 0.02 part of cross-linking agent and 200 to 300 parts of deionized water. The invention also provides a preparation method of the low-ionic-degree polyacrylamide and application of the low-ionic-degree polyacrylamide in sewage treatment. The product disclosed by the invention is relatively low in ion degree, has an excellent flocculation effect and good solubility and stability, is suitable for the fields of sewage treatment, papermaking, mineral separation and the like, and has a wide application prospect.

The present application relates to the technical field of concrete admixtures, in particular to a shrinkage-reducing admixture for concrete, a preparation method and application thereof.The preparation process of the present application overcomes the problems of poor alkali resistance of traditional admixtures and easy cracking of solidified concrete.The present application comprises the following steps: preparing a reducing initiator, a chain transfer agent, an unsaturated acid monomer, a shrinkage-reducing functional monomer and an amide functional monomer solution by step-by-step preparation, controlling the polymerization conditions under nitrogen protection, and obtaining a water reducing agent; using alkyl glycoside as a starter, step-by-step polymerizing propylene oxide and ethylene oxide to obtain a low-foaming polyether; mixing the water reducing agent and the low-foaming polyether with an alkali-resistant additive to obtain a shrinkage-reducing admixture; and significantly improving the water-reducing rate, flow retention and compressive strength of concrete, optimizing the setting time, reducing the dry shrinkage rate and the influence of alkali erosion, and improving the compactness and durability of concrete through hydrogen bond network, low surface tension and alkali resistance protection.The viscosity of the concrete admixture is moderate, which is suitable for concrete application, and the process is stable and easy to industrialize.