288 results about "Macromonomer" patented technology

The invention belongs to the technical field of concrete, and particularly relates to a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from an unsaturated polyether macromonomer, an unsaturated acid monomer, an unsaturated carbonate monomer, an unsaturated amino monomer, an initiator, a reducing agent, a chain transfer agent, deionized water, a solubilizer and organic alcohol amine. Wherein the unsaturated carbonate monomer is allyl methyl carbonate, and the unsaturated amino monomer is 2-aminoethyl methacrylate hydrochloride. According to the invention, excellent water reducing effect and stable control capability on concrete slump are maintained, and micro-cracks can be effectively made up through a dual mechanism formed by carbonate release and CaCO3 precipitation in the early and later stages of concrete hardening.

A method for preparing monodisperse nanoscale calcium fluoride, comprising the following steps: (S1) dispersing calcium long-chain alkylbenzenesulfonate and an acrylate copolymer in a mixed solution of water, n-hexane, and an alcohol to form a stable emulsion A, wherein monomers of the acrylate copolymer comprise (meth)acrylic acid, a polyether macromonomer, and a C1-4 alkyl (meth)acrylate; (S2) dissolving a fluoride salt in water, adding polyvinyl alcohol, and uniformly mixing these materials to obtain a solution B; and (S3) slowly dropwise adding the solution B to the emulsion A under stirring and ultrasonic conditions, and carrying out standing for aging, centrifugal separation, washing, and drying to obtain monodisperse nanoscale calcium fluoride. By using the calcium long-chain alkylbenzenesulfonate with surface activity as a calcium source in combination with homemade acrylate as a dispersing agent, an emulsion is formed in a specific combined solvent, and by dropwise adding a fluorine salt aqueous solution to the emulsion under an ultrasonic condition, nanoscale calcium fluoride with a uniform and controllable particle size can be prepared under the action of a microemulsion.

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 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 provides a retarding type polycarboxylate superplasticizer as well as a preparation method and application thereof, and belongs to the technical field of building material concrete admixtures. The retarding type polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 300 to 400 parts of polyether macromonomer, 60 to 150 parts of unsaturated carboxylic acid micromonomer, 30 to 60 parts of unsaturated sulfonic acid monomer, 15 to 30 parts of alkylphenol polyoxyethylene ether phosphate, 1.5 to 12 parts of chain transfer agent, 2 to 15 parts of initiator, 15 to 50 parts of caustic soda liquid and 200 to 600 parts of solvent. The polycarboxylic acid water reducing agent product with the retarding characteristic is synthesized through an RAFT method, the binding force between phosphate radicals and calcium ions in a cement pore liquid of the preparation raw material alkylphenol polyoxyethylene ether phosphate is high, hydration of C3A and formation of ettringite are delayed, the retarding effect of the water reducing agent is enhanced, and the polycarboxylic acid water reducing agent has the anion characteristic and the nonionic characteristic and can be used as a water reducing agent. And the workability of the concrete is improved.

The invention discloses a polycarboxylate superplasticizer with a linear water-reducing rate as well as a preparation method and application of the polycarboxylate superplasticizer. The water reducing agent is prepared from a polyether macromonomer phosphating derivative, a carboxylic acid monomer, a sulfonic acid monomer, an ester slump retaining monomer, a linear regulation and control monomer and other units through a free radical emulsion polymerization process. Compared with a traditional polycarboxylic acid water reducer, the water reducer has more regular side chain arrangement, higher charge density, higher adsorption capacity and more stable dispersing performance, the water-reducing rate can be linearly increased along with the increase of the mixing amount within the effective mixing amount range, and the water-reducing efficiency is improved. The problem that the concrete fluidity is difficult to control due to nonlinear fluctuation of the water reducing rate of a traditional polycarboxylic acid water reducing agent is solved, and the method has important significance on improving the concrete construction stability and the engineering quality. The product provided by the invention has excellent mud resistance and slump loss resistance besides high linear water-reducing rate, is suitable for various cast-in-place and precast concrete projects, and has remarkable economic value and application prospect.

To provide a resin composition for adhesives that can form an adhesive layer excelling in: unevenness followability during bonding; shape retentivity before bonding; and softness during low-temperature use.SOLUTION: A resin composition for adhesives contains a methacrylic copolymer having a macromonomer (A)-derived constitutional unit and a vinyl monomer (B)-derived constitutional unit. The macromonomer (A) has an alkyl methacrylate (a)-derived constitutional unit having a C8-30 alkyl group.SELECTED DRAWING: None

The invention provides a preparation method of a single-ended vinyl hyperbranched polyether macromonomer, which can be applied to the technical field of hyperbranched polyether synthesis. The method comprises the following steps: carrying out ring-opening polymerization reaction on any one of an epoxy group-containing vinyl monomer, a hydroxyl group-containing vinyl monomer or a carboxyl group-containing vinyl monomer and glycidol in the presence of a catalyst and a polymerization inhibitor to form the single-ended vinyl hyperbranched polyether macromonomer with an amino group, ester group or ether group structure. The invention also provides a single-ended vinyl hyperbranched polyether macromonomer product.

The present invention belongs to the technical field of preparation of water reducers, and the present invention discloses a low-temperature early-strength water reducer and a preparation method thereof. The present invention obtains a polyester macromonomer by first subjecting the monomer obtained by amidation reaction and esterification reaction to Michael addition reaction, and then undergoes free radical polymerization reaction with polyether macromonomer, carboxylic acid small monomer and sulfonic acid small monomer, and then sequentially undergoes functional modification by Hofmann degradation reaction and amidation reaction, and then undergoes Thiol-ene reaction with thiolated trehalose to synthesize a low-temperature early-strength water reducer. The low-temperature early-strength water reducer prepared by the present invention has the advantage of maintaining good dispersibility under low-temperature conditions, and the synthesis process is controllable, energy-saving and environmentally friendly, and can be effectively used in the field of concrete to solve the problems of poor concrete working performance and slow early strength development under low-temperature conditions, and has broad application prospects.

The invention discloses an isolator for establishing a bone nonunion animal model and a preparation method of the isolator, and relates to the technical field of medical instruments, and the preparation method comprises the following steps: step 1, obtaining a hydrogen-containing silicone oil prepolymer with a side chain containing Si-H bonds; 2, obtaining a silica gel macromonomer with an epoxy group on a side chain; step 3, obtaining an anti-inflammatory functionalized silica gel macromonomer; 4, reconstructing the skeleton model in a three-dimensional manner, and creating a defect isolator model; 5, adding the anti-inflammatory functionalized silica gel macromonomer obtained in the step 3 and a reactive diluent into a mixing tank, adding a cross-linking agent and polyether modified polydimethylsiloxane under mechanical stirring, stirring for 30 minutes, defoaming for 2 hours under 500Pa vacuum, and standing and curing in a darkroom after defoaming; and 6, a multi-material-box DLP photocuring 3D printer is adopted for isolator printing. According to the method, observation interference on the bone nonunion pathological process is fundamentally reduced, and high-fidelity modeling construction is achieved.

The invention relates to the field of concrete, and particularly discloses a steam-curing-free early strength agent for sleeper concrete and a preparation method thereof.The steam-curing-free early strength agent for sleeper concrete is prepared from a polymeric macromonomer, a polymeric micromonomer and a functional micromonomer according to the molar ratio of 1: (3.5-4): (0.4-0.7), the polymeric macromonomer comprises one or more of TPEG, EPEG and HEPG, the polymeric micromonomer comprises acrylic acid, sodium methallyl sulfonate, hydroxyethyl acrylate and butyl acrylate, the acid-ester ratio in the polymeric micromonomer is (3-4): (6-7), and the functional micromonomer is prepared from cellulose and maleic anhydride. According to the steam-curing-free early strength agent, the 3d compressive strength of concrete can be improved by 129.6% or above, the 28d compressive strength of the concrete can be improved by 75.8% or above, the concrete has good early strength and durability, and the competitive advantages of sleeper concrete in the field of sleepers are improved.

The invention discloses a high-refractive-index-difference bottle brush block polymer and a synthetic method of a degradable structural color material, and belongs to the technical field of organic polymers. The end group of the high-refractive-index degradable macromonomer is a cycloolefin derivative capable of performing sequential ring-opening metathesis polymerization reaction (ROMP), and the main chain is a degradable polymer prepared by performing ring-opening copolymerization reaction on styrene oxide (SO) and a comonomer. A series of novel degradable cycloolefin macromonomers are designed and synthesized to replace polystyrene and other non-degradable high-refractive-index polymers commonly used in the field, and the macromonomers and a block copolymer brush are synthesized through ring-opening polymerization and ring-opening metathesis polymerization. And an environment-friendly structural color material capable of covering a full visible light wave band is further prepared by utilizing a phase separation mechanism.

The purpose of the present invention is to provide an intermediate compound for providing a silicone macromonomer in which a (meth) acrylic group is introduced at a high ratio at both ends and a quaternary ammonium cation site is contained in the molecular chain. Specifically disclosed is an organopolysiloxane which is represented by general formula (1) and has a tertiary amino group in the molecular chain. (In general formula (1), each R independently represents a group selected from the group consisting of an alkyl group having 1-10 carbon atoms, an aryl group having 6-10 carbon atoms, and an aralkyl group having 7-10 carbon atoms, each R1 independently represents a group selected from the group consisting of an alkyl group having 1-10 carbon atoms, an aryl group having 6-10 carbon atoms, and an aralkyl group having 7-10 carbon atoms, and each R2 represents a group selected from the group consisting of an alkyl group having 1-10 carbon atoms, an aryl group having 6-10 carbon atoms, and an aralkyl group having 7-10 carbon atoms. Q1 and Q2 are each independently a hydrogen atom or a group represented by formula (2) (where at least one of Q1 and Q2 is a hydrogen atom, a is an integer of 1-400, and b is an integer of 1-50) (in formula (2), R1 is a group selected from the group consisting of an alkyl group having 1-10 carbon atoms, an aryl group having 6-10 carbon atoms, and an aralkyl group having 7-10 carbon atoms).

The invention discloses a mechanical tough light-heat dual-curing bio-based coating and a use method thereof. The coating comprises a cellulose macromonomer grafted with double bonds, a castor oil-based monomer containing steric hindrance urea bonds, a diluent, a photoinitiator and diisocyanate. The application method comprises the following steps: mixing the materials, coating the surface of a base material with the mixed materials, curing under ultraviolet light, and then carrying out thermocuring. The castor oil is subjected to chemical modification to introduce steric hindrance urea bonds and chain-end double bonds, and the castor oil, the cellulose macromonomer grafted with the double bonds, the diluent, the photoinitiator and the diisocyanate are subjected to photo-thermal dual curing to form a coating on the surface of a base material, so that the mechanical strength of the coating is remarkably improved.

The invention belongs to the technical field of sealants, and relates to a migration-resistant polysiloxane plasticizer and an organosilicon sealant containing the migration-resistant polysiloxane plasticizer. Wherein a, b and c are integers, 0 < = a < = 8, 0 < = b < = 8, 0 < = c < = 8, and a + b + c > 0; r1 and R2 are independently alkyl of C1-C6, and R3 is gamma-aminopropyl, gamma-(2, 3-epoxypropoxy) propyl or gamma-isocyanate propyl; the organosilicon sealant contains a filler modified by a functional polymer, and the functional polymer is obtained by copolymerization of a polyether macromonomer, an indolyl-containing alkenyl monomer and an alkenyl silane coupling agent. The plasticizer disclosed by the invention has the advantages of migration resistance, good compatibility and avoidance of excessive cross-linking, and the plasticizer and the modified filler are cooperatively used, so that the adhesive property of the organic silicon sealant is effectively improved while the advantages of the plasticizer and the modified filler are exerted. # imgabs0 #

The invention relates to the field of oilfield chemistry, in particular to an amphiphilic block poly-surfactant containing a surfactant functional group and a preparation method of the amphiphilic block poly-surfactant. Through molecular structure design, a self-made amphiphilic block copolymer macromonomer is added, a side chain of the macromonomer has a hydrophobic polycaprolactone block and a hydrophilic polyethylene glycol block at the same time, and the side chain with the built-in amphiphilic block integrates strong emulsification stripping and hydrophobic association effects at the same time; due to the strong emulsifying and stripping capacity to residual oil after water flooding and the deep profile control capacity to a reservoir, the recovery efficiency of an oil reservoir after water flooding is remarkably improved.

The invention belongs to the field of concrete admixtures, and particularly relates to a viscosity-reducing surface brightener as well as a preparation method and application thereof. The preparation method of the viscosity-reducing surface brightener comprises the following steps: carrying out polymerization reaction on a polyether macromonomer, unsaturated carboxylic acid, unsaturated carboxylic ester and a modified monomer in water, the polymerization reaction system is converted from initial solution polymerization to soap-free emulsion polymerization by controlling the proportion of unsaturated carboxylic acid, unsaturated carboxylic ester and modified monomer in the polymerization reaction system, and the obtained polymerization reaction product is the viscosity-reducing surface brightener. The viscosity-reducing surface brightener prepared by the method provided by the invention can effectively improve the initial flowability and glossiness of concrete at a lower mixing amount.

Macromers and compositions, methods of making macromers and making objects and articles of manufacture, and objects and articles of manufacture. In various examples, a macromer comprises oligomer group(s) comprising one or more norbornene group(s). In various examples, a method of making macromer(s) comprises reacting oligomer(s), norbornene group precursor(s), and optionally, base catalyst(s) and / or aliphatic epoxide(s) to form the macromer(s). In various examples, a composition (which may be an emulsion), comprises macromer(s); and optionally, crosslinker(s), photoadditive(s), thermal additive(s), diluent(s), or any combination thereof. In various examples, a method of forming an object or an article of manufacture comprises irradiating or thermally treating a monolith comprising one or more composition(s), where crosslinking groups are formed. In various examples, an object or an article of manufacture, comprises at least partially crosslinked macromer(s) and may be porous and / or may comprise an interpenetrating network.

This invention discloses a four-armed star-shaped polymer containing a polyoxyethylene structure, its preparation method, composition, and applications. The polymer is prepared by mixing an unsaturated organic carboxylic acid compound, an unsaturated sulfonic acid compound, and water, stirring to obtain a reaction solution, and continuously stirring and heating the reaction solution. An aqueous solution of a polyether macromonomer compound and the initiator aqueous solution are added to the heated reaction solution, followed by polymerization and purification. The polymer structure contains a large number of carboxyl groups, sulfonic acid groups, and ether groups, as well as abundant polyoxyethylene groups and alkyl chains, giving the polymer good water solubility and excellent chelating properties for metal ions. The polymer prepared by this method shows good effects in cleaning, defoaming, and scale inhibition. Furthermore, compositions formed by combining the polymer with other corrosion and scale inhibitors exhibit good compatibility and can be used for scale inhibition in high-hardness water.

The invention discloses a preparation method of a slurry-extracting and gas-retaining concrete admixture, which is characterized in that dodecenyl succinic anhydride, ethanediamine or hexamethylenediamine and caprolactam are used as raw materials, and a carboxyl-terminated polyamide monomer (PAMA) with a long-chain olefin hydrophobic structure is synthesized through amidation and ring-opening reaction. And carrying out free radical copolymerization on the monomer, acrylic acid, a polyether macromonomer (HPEG / TPEG), hydroxyethyl acrylate, hydroxypropyl acrylate and the like in an aqueous solution to prepare a target additive. According to the invention, the self-synthesized PAMA monomer is introduced, and a long-chain hydrophobic structure in molecules of the PAMA monomer can be directionally adsorbed on the surfaces of cement particles to form a stable microscopic hydrophobic region and has a synergistic effect with the acrylate monomer, so that the gas-retaining property and the slurry extraction effect of the concrete are remarkably enhanced, and the problems of bleeding and segregation are effectively solved. The method is simple in process, the product is excellent in comprehensive performance, and the compounding process is simplified.

The present application relates to the technical field of concrete admixtures, and particularly relates to a polycarboxylic high-performance water-reducing agent for wind power tower cylinder segments and a preparation method thereof. The water-reducing agent is polymerized from an unsaturated macromonomer, an unsaturated carboxylic acid and / or an unsaturated carboxylic anhydride, and a foam control function monomer under the action of an initiator and a molecular weight regulator; the foam control function monomer is an unsaturated carboxylic ester silicone oil. The unsaturated carboxylic ester silicone oil is chemically bonded to the polycarboxylic molecular main chain, providing steric hindrance to enhance the water-reducing effect in the initial stage of concrete, and the low-molecular-weight side chain in the molecular structure improves the viscosity reduction performance. In the alkaline hydration process, the ester bond is hydrolyzed to release silicone oil in situ to play a defoaming role, effectively eliminating harmful pores and apparent bubbles in concrete, so that the surface of the wind power tower cylinder segment is smooth and bubble-free after demolding, and the water-reducing agent has the advantages of high water-reducing rate, significant strengthening effect, simple preparation process, and the like, and is particularly suitable for UHPC ultra-high performance concrete segments.

The application belongs to the technical field of concrete admixtures, and discloses a low-temperature shrinkage reducing agent and a preparation method. The technical problems of poor stability of an ordinary compound polycarboxylic acid shrinkage reducing agent, poor concrete compressive strength, low shrinkage performance and poor concrete crack resistance caused by use of the polycarboxylic acid shrinkage reducing agent in a low-temperature environment are effectively solved. Therefore, the modified alcohol ether is copolymerized with a polyether macromonomer and acrylic acid, and is supplemented with an amide functional small monomer and a reaction aid by using an oxidation-reduction initiation system to synthesize a shrinkage reducing agent with a polycarboxylic acid structure in an aqueous solution. When the shrinkage reducing agent is mixed into concrete in a low-temperature environment, the water retention of the concrete is enhanced, the concrete shrinkage rate is improved, and the crack resistance of the concrete is improved.

A process for upcycling a polymeric waste material containing a polyarylethersulfone (PAES polymer) having less than 20 mol% reactive end groups, comprising depolymerizing the PAES polymer in the presence of a phenolic nucleophile and an alkali salt-forming carbonate agent in a polar aprotic solvent to obtain a PAES reactive macromer of lower molecular weight which is recovered. A composite comprising a resin matrix, reinforcing fibers and the PAES reactive macromer. An article made from a self-crosslinking PAES reactive macromer. Such a PAES reactive macromer contains more than 60 mol% of reactive end group(s) Ref, at most 20 mol% halide end group(s) X, and at most 20 mol% of unreactive end group(s) Ne, based on the total amount of moles of end groups. Preferably, Ref contains at least one group selected from –OH, -NH2, -COOH, –C≡CH, –C≡C–Ar, and / or an OH group connected to –Ara--W-Ara-, wherein Ar is an aryl group, Ara is an allyl-substituted aryl group, and W is a single bond, –C(CH3)2– and / or –SO2–. Preferably, Ne is an alkoxy group, such as methoxy, and X is Cl.

The invention belongs to the technical field of medical polymer materials, and discloses hydrogel as well as a preparation method and application thereof. The hydrogel comprises the following raw materials: a macromonomer, a polyamidoamine dendrimer, a photoinitiator, a delayed photosensitizer and a solvent, the mass ratio of the macromonomer to the polyamidoamine dendrimer is (1: 10)-(10: 1). The hydrogel has high transparency and excellent puncture resistance, and a needle passage left after the hydrogel is punctured can be quickly self-repaired, so that no trace is left after repeated puncture, and ultrasonic imaging is prevented from being interfered.

The invention discloses a high-efficiency polycarboxylic acid polyether macromonomer preparation method, and belongs to the field of polycarboxylic acid polyether macromonomers, in the reaction, enol is added, nitrogen is used for replacement, then trimethylaluminum and anhydrous zinc chloride are added, stirring is carried out for dissolution, metallic sodium is added as a catalyst to obtain an initiator, the reaction time is 200-360 min, the addition amount of trimethylaluminum is 0.002-0.003%, the reaction time is 1-2 min, and the reaction time is 1-2 min. The addition amount of anhydrous zinc chloride is 0.005-0.006%, and the principle is that trimethylaluminum and anhydrous zinc chloride belong to Lewi acids, have a vacancy capable of accepting electron pairs to form coordinate bonds, react with Lewi alkali, and can be combined with alcohol to generate Lewi acid characteristics to react with metal sodium. In the prior art, a larger reactor is configured to increase the single-batch yield of an initiator, the input amount of single-batch alkali metal (such as metal sodium and sodium hydride) is increased sharply, and the production risk is greatly improved; and meanwhile, the prolonging of the storage time of the initiator can cause the increase of chromaticity and directly influence the stability of product indexes, and the method is mainly applied to the synthesis of polycarboxylic acid polyether macromonomers.

The application provides a modified polyether amine macromonomer-containing copolymer oil displacement agent and a preparation method thereof, and belongs to the field of oil field chemistry.The preparation method comprises the following steps: adding equimolar p-chlorobenzaldehyde and polyether monoamine into ethanol, stirring at room temperature to perform Schiff base reaction to obtain an intermediate product solution; adding N-(3-dimethylaminopropyl) methacrylamide which is equimolar with the p-chlorobenzaldehyde into the intermediate product solution to perform quaternary ammonium reaction, and removing ethanol by rotary evaporation to obtain a modified polyether amine macromonomer; polymerizing the modified polyether amine macromonomer with acrylamide, and crushing, hydrolyzing and drying the polymerization product to obtain a hydrophobically modified polyacrylamide containing a polyether amine structural unit.The oil displacement agent has good temperature resistance and salt resistance, and can be used to configure a polymer solution by using seawater as a solvent.

The invention relates to the technical field of concrete admixtures, and particularly discloses a preparation method of an anti-freezing high-dispersion water reducing agent, which comprises the following steps: S1, preparing a base material: adding an allyl polyoxyethylene ether macromonomer and deionized water into a reaction container to form a macromonomer aqueous solution; then adding a sulfonic acid small monomer and a first part of initiator into the macromonomer aqueous solution; s2, preparation of a material A: dissolving acrylic acid, acrylamide, a hydroxyl-containing acrylate monomer or a hydroxyl-containing methacrylate monomer, a polyethylene glycol acrylate monomer or a polyethylene glycol methacrylate monomer and urea in deionized water to prepare the material A; s3, preparation of a material B: dissolving a chain transfer agent, a reducing agent and a second part of initiator in deionized water to prepare the material B; s4, dropwise adding and polymerizing: dropwise adding the material A and the material B into the reaction container at the same time; and S5, post-processing. The scheme is used for solving the problem that high dispersibility and anti-freezing property of concrete in a low-temperature environment cannot be effectively considered in the prior art.

The invention relates to the technical field of concrete, and particularly discloses a polycarboxylate-type high-performance water reducing agent and a preparation method thereof. The polycarboxylate-type high-performance water reducing agent is prepared from the following raw materials: a polyether macromonomer, an unsaturated carboxylic acid micromonomer, a chain transfer agent, an oxidizing agent, a reducing agent and a retarder, the preparation method of the polycarboxylate-type high-performance water reducer comprises the following steps: S1, premixing: mixing a polyether macromonomer with water according to a weight ratio of 1: 2-1: 3 to obtain a premixed solution; s2, carrying out prepolymerization reaction; s3, main polymerization reaction; s4, curing reaction; s5, neutralizing; and S6, purifying. The polycarboxylate-type high-performance water reducing agent can be used for preparing concrete engineering with high fluidity, high strength and ultra-long pumping distance, and has the advantages of concrete construction performance and long-term durability; in addition, the preparation method provided by the invention has the advantage of improving the dispersion efficiency and storage stability of the water reducing agent.

This invention relates to the field of concrete, and more particularly to a novel flocculant specifically for washed sand and its preparation and application methods. The flocculant is prepared via free radical polymerization using unsaturated acids, amide monomers, polyether macromonomers, and asymmetric crosslinking agents as reactants. Based on its pH-responsive characteristics, this flocculant can intelligently switch between flocculant and water-reducing agent: during sand washing, it efficiently flocculates mud and fine powder in wastewater, promoting wastewater recycling; when it remains in manufactured sand and enters the alkaline environment of concrete, the ester bonds in the molecule can hydrolyze and break, degrading the flocculant into polycarboxylic acid fragments with a comb-like structure. This novel flocculant not only eliminates the problems of high water-reducing agent dosage and large slump loss caused by traditional flocculant residues, but the degradation products themselves can also play a dispersing role, helping to reduce the water-reducing agent dosage and improve the slump retention performance of concrete.

The invention relates to a mud-resistant polycarboxylate superplasticizer and a preparation method thereof, the mud-resistant polycarboxylate superplasticizer is prepared from the following raw materials: a polyether macromonomer, a hydrophobic macromonomer, an unsaturated acid monomer, a sulfonated compound, an oxidizing agent, a reducing agent, a chain transfer agent and water; wherein the preparation raw materials of the macromonomer with the hydrophobic function comprise an unsaturated compound and unsaturated phosphate. The prepared mud-resistant polycarboxylic acid water reducer has the advantages of being low in mixing amount, high in water reducing rate, good in workability and the like, is high in adaptability to high-mud-content aggregate (3%-10%), can remarkably improve the working performance of a cement-based material, and is suitable for various construction scenes.