30 results about "Cement particle" patented technology

This utility model discloses a grouting device for bridge engineering construction, belonging to the field of bridge engineering technology. It includes: a base plate and a mixing tank; a mounting cover fitted onto the upper end of the mixing tank, the mounting cover being located on the upper end of the base plate and internally connected to a drive shaft, the bottom end of the drive shaft extending into the mixing tank. This utility model, through first contact blocks located on the outer sides of multiple support sleeves and multiple second contact blocks at the bottom of the mixing tank, allows the mixing tank to reciprocate axially up and down with the periodic thrust generated at the contact points of the first and second contact blocks when the drive shaft rotates. This enhances the longitudinal convection of the grout and also causes the mixing tank to rotate in the opposite direction to the drive shaft, forming a three-dimensional composite mixing effect. This significantly improves the dispersion efficiency and mixing uniformity of cement particles, effectively shortens the mixing cycle, and thus improves the efficiency of grouting operations, enhancing the applicability and practicality of the equipment under complex working conditions.

The present application belongs to the technical field of concrete admixtures, and particularly discloses a composite hydration temperature rise inhibitor and a preparation method thereof. The present application provides a composite slow-release material with a novel structure to coat retarding acid with hydration temperature rise inhibition and hydrolysis products such as small-molecule sugar produced by hydrolysis of chitosan. When applied to concrete, the composite slow-release material can slowly swell during the cement hydration process, slowly release the retarding acid and small-molecule sugar coated therein, and inhibit the number of nucleation in the early stage of cement hydration by adsorbing cement particles or chelating calcium ions in the cement. The composite slow-release material itself has an adsorption effect and can adsorb early nucleation particles. The number of early nucleation particles is effectively reduced, the cement hydration rate is slowed down, and the purpose of hydration regulation is achieved. Moreover, the slow release of the retarding acid does not cause the problem of excessively prolonged setting time. The composite hydration temperature rise inhibitor has good application in inhibiting temperature cracks of concrete.

The utility model belongs to water reducing agent production technical field, concretely speaking is a kind of water reducing agent production adding device, including base, one group of support leg is fixedly connected on the base outer circle wall, the mixing bucket is fixedly connected with the base top, the detachable casing is equipped in the mixing bucket top, the connecting plate is fixedly connected with the casing top, the sealing plate is slidably connected with both sides of the connecting plate, the material groove is fixedly connected with the sealing plate top, the material groove is communicated with the sealing plate, the blanking head is seted up in the material groove inside, the baffle is slidably connected in the blanking head inside, to make up the deficiency of prior art, to solve water reducing agent in production process, possibly because adding device cannot realize ration feeding, lead to water reducing agent performance unstable, active ingredient concentration fluctuation leads to water reducing rate difference, appears local caking or delamination phenomenon, caking area can lead to cement particle dispersion uneven, hydration product distribution appears obvious gradient problem.

The application provides a cement cost determination method and device, electronic equipment and medium, and relates to the field of cement.The method comprises the following steps: obtaining target proportions of component cement ingredients according to each proportion constraint interval of the component cement ingredients and a preset proportion target; and determining the cement cost according to the target proportions of all component cement ingredients and the unit price of each component cement ingredient, in the case that a target particle size distribution of the target proportions meets a preset particle size distribution constraint interval, a target cement fineness of the target proportions meets a preset cement fineness constraint interval, and a target cement strength of the target proportions meets a preset cement strength constraint interval.The application seeks an optimal cement grinding ingredient scheme by taking the following conditions as constraints: suitable cement particle size distribution composition, lowest cement comprehensive cost, and lowest cement quality meeting standard requirements, so as to reduce the cement cost while ensuring that the constraints are met.

This utility model discloses a compressive strength testing device for cement-modified mudstone. The device includes a base, a test plate on the upper surface of the base, a pressure sensor fixed at the connection between the lower surface of the test plate and the upper surface of the base, and top frames fixedly installed at both ends of the upper surface of the base. Two cylinders are fixedly installed at the top of the top frames, and pressure plates are fixedly installed inside the top frames at the ends of the two cylinders. By designing a cleaning and scraping mechanism, when cement particles remain on the surfaces of the pressure plates and test plates after testing, the moving frame and scraper can be stably moved so that the scrapers on both sides contact the surfaces of the test plates and pressure plates respectively to scrape and clean them. This facilitates cleaning, and allows for accurate testing of mudstone placed stably on the surface of the test plate during subsequent tests. This improves the convenience and accuracy of cleaning the main body of the compressive strength testing device during cement-modified mudstone compressive strength testing.

This invention relates to the field of building materials and concrete admixtures, and particularly to a hydration temperature rise inhibitor, its preparation method, and its application. The hydration temperature rise inhibitor of this invention employs a host-guest supramolecular assembly strategy, using calixarene as the host and polyhydroxy compounds as the guest, constructing a capsule-like composite structure through hydrogen bonding. During cement hydration, calixarene is first adsorbed onto the surface of cement particles, delaying the nucleation and growth stages of cement hydration through interfacial adsorption. Subsequently, the calixarene gradually dissolves and continuously releases polyhydroxy compounds, allowing them to enter the aqueous phase. The released polyhydroxy compounds further effectively inhibit the interfacial reaction process of cement hydration, thereby slowing down the hydration heat release rate, reducing the hydration temperature peak, and achieving regulation of the early hydration temperature rise of cement. The hydration temperature rise inhibitor has wide applicability, significantly reducing the risk of concrete cracking caused by temperature drop shrinkage, and effectively improving the durability and long-term safety of engineering structures.

The utility model provides a filling board wall overflow ash separation device which comprises a board body which is vertically arranged and is provided with a first signal pipe, a second signal pipe, an overflow pipe, an exhaust pipe and a filling pipe which are vertically connected with the board body. One end of the overflow pipe is provided with a filter screen assembly, and the filter screen assembly is connected with the overflow pipe through a binding wire; a flow guide valve is arranged at one end of the filling pipe, the filter screen assembly comprises a connecting ring, and a filter screen is arranged in the middle of the connecting ring. Before filling, the filter screen is bound at the inner end of the overflow pipe, and the diverter valve is mounted at the other end of the overflow pipe, so that rainfall is convenient to discharge; meanwhile, the ash isolating device is installed, so that ash and cement particles are effectively prevented from being lost, redundant water is discharged, and the quality and the roof contact rate of the filling body are improved.

The application discloses a hydrophobic-photocatalytic composite cement material and a preparation method, and relates to the technical field of inorganic non-metallic materials, and comprises the following steps: S1, taking 89wt% of a silicate cement matrix, 10wt% of a TiO2 photocatalyst and 1.0wt% of a stearic acid hydrophobic agent according to the mass percentage; S2, the silicate cement, the TiO2 photocatalyst and the stearic acid hydrophobic agent are preliminarily mixed by mechanical stirring to obtain a mixture; S3, the mixture is added into a ball mill for ball milling modification, grinding balls with different diameters are matched according to a certain proportion, the rotating speed of the ball mill and the ball milling time are controlled, the overall hydrophobic property and the photocatalytic property of the composite cement material are endowed, and the hydrophobic-photocatalytic composite cement material is obtained after discharging. The application realizes the uniform dispersion of the TiO2 photocatalyst in the cement matrix through ball milling, and simultaneously makes the stearic acid hydrophobic agent fully dispersed in the cement particles, so that the overall hydrophobic property and the photocatalytic property of the composite cement material are endowed, instead of the local hydrophobic property and the photocatalytic property of the surface coating.

The application provides a reconstruction method for continuous slicing SEM three-dimensional morphology of unhydrated cement particles, which has the following characteristics and comprises the following steps: step S1, constructing and training an unhydrated cement particle segmentation model based on a deep learning-based instance segmentation network according to an unhydrated cement particle sample data set, performing image segmentation on SEM image data of unhydrated cement particles to be processed by using the unhydrated cement particle segmentation model, and obtaining a predicted result image sequence; step S2, performing image alignment on the predicted result image sequence to obtain an aligned image sequence; and step S3, performing instance repair and three-dimensional morphology reconstruction on the aligned image sequence to obtain a three-dimensional morphology reconstruction image. In summary, the method can efficiently and accurately perform three-dimensional morphology reconstruction and structure quantification on unhydrated cement particles.

The application discloses a slurry-lifting and viscosity-reducing polycarboxylic water reducing agent suitable for low-cement-content concrete and a preparation method thereof, and belongs to the technical field of building materials. The hydrophobic functional macromonomer is prepared by using dimerized fatty acid and bio-based dihydric alcohol as raw materials and by glycidyl methacrylate end-capping; the hydrophilic branched macromonomer is obtained by using citric acid, glycerol and monomethoxypolyethylene glycol as raw materials and by esterification and end-capping; and the target water reducing agent is obtained by the oxidation-reduction free radical copolymerization of the two kinds of macromonomers and sodium maleate in an aqueous phase. The application constructs a star-shaped multi-arm hyperbranched topological structure through molecular structure design, forms a dense adsorption layer on the surface of cement particles, has the functions of strong adsorption and dispersion, steric hindrance effect and lubrication, can reduce the viscosity of concrete mixture while significantly improving the slurry wrapping property and stability, and solves the problem that the fluidity and wrapping property of low-glue concrete are difficult to be considered simultaneously.

The application relates to the field of mortar, in particular to high-strength rapid-setting repair mortar and a preparation process thereof. The preparation process of the high-strength rapid-setting repair mortar comprises the following steps: preparing a coagulant; preparing modified bamboo fiber; preparing composite polypropylene fiber; preparing an anti-freezing agent; and preparing the repair mortar. The coagulant is prepared by taking acrylic acid, potassium persulfate and deionized water as raw materials to prepare A liquid, taking L-ascorbic acid, thio glycolic acid and deionized water as raw materials to prepare B liquid, then uniformly mixing methyl alkenyl polyoxyethylene ether, sodium methallyl sulfonate, acrylic amine and deionized water, and adding the A liquid and the B liquid to react, and finally adding the coagulant into the repair mortar. The coagulant can not only efficiently disperse the cement particle flocculation structure, release the free water wrapped therein, greatly reduce the mixing water consumption and reduce the water-cement ratio, but also effectively shorten the setting time of the repair mortar and improve the early strength.

The invention relates to the technical field of concrete admixture preparation, and particularly discloses a cement concrete admixture and a preparation method and application thereof.According to the cement concrete admixture, through multi-synergistic copolymerization of a polyether macromonomer, acrylic acid, modified cellulose and sodium allysulfonate in a specific proportion, the cement concrete admixture is prepared; the comprehensive performance of the concrete is improved. Methylallyl alcohol polyoxyethylene ether and acrylic acid construct a main framework of the admixture, so that the steric hindrance and the initial dispersion force of a foundation are guaranteed; by sulfonating cellulose and introducing a negatively charged sulfonic acid group, the flocculation structure among cement particles can be broken, and the initial water-reducing rate and the flowing speed are remarkably improved; and by introducing a carbon-carbon double bond, the modified cellulose can be introduced into a polycarboxylic acid macromolecular chain through a copolymerization reaction, and a rigid cellulose skeleton and a flexible polyether side chain jointly construct a three-dimensional space network structure, so that the steric hindrance effect of the admixture is jointly improved.

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 application discloses a kind of biochar-based carbon-negative functional cement particle board and preparation method thereof, the preparation method includes that biomass is pyrolyzed at 400~600 ℃, broken, screening to obtain biochar;Biochar, Portland cement, mineral admixture are uniformly mixed, stirring to obtain mixed dry material according to the proportion of mass ratio (40-60):(28-42):(12-18);Water is added to mixed dry material, and stirring is uniformly obtained slurry;Part of slurry is placed into mould, then basalt grid fiber is added, then another part of slurry is added to cover the basalt grid fiber, surface is vibrated and flattened, and after pressing, the blank of plate is demoulded;The blank of plate is first carbonized and cured by CO2, and then standard curing is carried out to obtain biochar-based carbon-negative functional cement particle board.The cement particle board prepared by the method is light weight, high strength and has good durability, and also has high heat preservation, sound absorption and noise reduction and carbon-negative property.

This invention belongs to the field of ultra-high performance concrete technology, specifically relating to a modified ultra-high performance concrete, its preparation method, and its application. The modified ultra-high performance concrete comprises the following raw materials in parts by weight: 60-80 parts cement, 30-40 parts mineral admixtures, 5-10 parts fiber, 120-140 parts sand, 1-1.5 parts water-reducing agent mother liquor, and 0.5-1 parts retarder, with a water-cement ratio of 0.14-0.2; the water-reducing agent mother liquor has a solid content of 35-42 wt% and is copolymerized from acrylate monomers, acrylate monomers, unsaturated sulfonate monomers, and unsaturated polyethers; the retarder is a compound of carboxylated tea polyphenols and salicylic acid, with the carboxylated tea polyphenols obtained by modifying tea polyphenols with chloroacetic acid. The water-reducing agent is first adsorbed onto the surface of cement particles, and the long polyether side chains extend into the water to form a steric hindrance layer, which disperses the cement particles and prevents agglomeration. The carboxylated tea polyphenols and salicylic acid are combined as a retarder to inhibit the dissolution of cement minerals and the crystallization of calcium hydroxide, thus delaying cement hydration. The modified ultra-high performance concrete has low viscosity and controllable retarding.

The invention relates to the technical field of grouting materials, in particular to a high-performance prestressed duct grouting material which comprises water, cement, silica fume, mineral powder, limestone powder, a water reducing agent, microbeads, a plastic expanding agent, a suspension stabilizer and a defoaming agent.The cement, the silica fume, the mineral powder, the limestone powder and the microbeads are used for constructing a multi-element mineral admixture system; the powder materials with different particle sizes are mutually filled, so that close accumulation among particles is realized, and the void ratio among the powder is effectively reduced, thereby reducing the water consumption required for filling gaps and improving the compactness and the homogeneity of the slurry; meanwhile, the water reducing agent efficiently disperses cement particles through the steric hindrance effect, the microbeads reduce the friction resistance in the slurry through the spherical ball effect of the microbeads, the plastic viscosity and yield stress of the slurry are remarkably reduced through the combined action of the water reducing agent and the microbeads, and the slurry is endowed with excellent initial fluidity and long-time fluidity maintaining capacity; and it is ensured that the slurry can be rapidly and smoothly filled in the prestressed duct.

This invention relates to the field of concrete technology and discloses a concrete water-retaining and slurry-enhancing agent and its preparation method. The concrete water-retaining and slurry-enhancing agent includes an allyloxy polyacrylate water-reducing agent, cellulose mercaptoacetate, and triethylamine. The cellulose in the water-retaining and slurry-enhancing agent can act as a thickener and viscosity enhancer, adjusting the consistency of the slurry mixture, improving bleeding and water retention, and enhancing the water-retaining and cohesive properties of the concrete, thus giving it better fluidity and workability. During concrete curing, the numerous alkenyl groups on the side chains of the allyloxy polyacrylate water-reducing agent undergo an addition reaction with the mercapto groups of cellulose, chemically cross-linking on the surface of inorganic particles such as cement silicate to form a hydrophilic polymer hydration film. This reduces the sliding resistance between inorganic particles, improves slurry fluidity, enhances the wettability of cement particles, accelerates the uniformity of the hydration reaction, and improves the compressive and flexural strength of the concrete.

This invention relates to the field of gypsum board technology, specifically to water-resistant and moisture-proof paper-faced gypsum board and its preparation process. It includes two layers of modified facing paper and a gypsum board core material between the two layers of modified facing paper. The core material is characterized by being composed of a modified core slurry, the raw materials of which consist of: gypsum clinker, water, cement granules, premixed paste, alkali-free glass fiber, hydrophobic / hydrophilic mixed starch, hydroxypropyl methylcellulose, a setting accelerator, and a silicone oil catalyst. This invention constructs a micro-nano titanium dioxide / silane composite hydrophobic coating on the surface of the facing paper, forming the first physical water-blocking layer. Simultaneously, silane-modified nanocellulose and emulsified silicone oil are introduced into the core material to establish a hydrophobic network. These two elements synergistically form a gradient protective structure of surface shielding and internal hydrophobicity. Even with localized wear of the outer coating, the core material can still effectively prevent moisture diffusion, significantly improving its water resistance reliability in long-term humid environments.

A method of making a cement composite can include contacting an aqueous solution comprising calcium ions with a carbon dioxide source producing a carbonated aqueous solution. Fine particles can be submerged in the carbonated aqueous solution to produce microaggregate particles comprising the fine particles coated with calcium carbonate. The microaggregate particles can be combined with cement particles to produce the cement composite. The cement composite can be used in cementing applications for hydrocarbon wells including for casing liners and well plugs.

This invention relates to the field of concrete admixtures, and discloses a slow-release polycarboxylate superplasticizer containing phosphate ester groups and its preparation method. The superplasticizer is prepared by polymerization and post-modification of polyether macromonomers, unsaturated carboxylic acid monomers, slow-release functional monomers, and phosphorus-containing functional components. The molecule simultaneously contains carboxylic acid groups, polyether side chains, slow-release structural units, and phosphate ester groups. By introducing the synergistic effect of the slow-release structure and phosphate ester groups, the adsorption and dispersion capacity of the superplasticizer for cement particles and calcium ions is improved, giving it a high water reduction rate, good slump retention, low bleeding rate, and excellent mud content adaptability. The preparation method is simple, mild, and easily industrialized, and is suitable for ready-mixed concrete, high-performance concrete, and complex aggregate concrete systems.

The application provides a composite agent with water-reducing and mud-inhibiting effects and a preparation method thereof. The composite agent is prepared by the following steps: firstly, preparing a multi-branched "core" through esterification of a polyhydric alcohol and an organic acid; secondly, preparing a multi-branched polymer water-reducing component through polymerization between the multi-branched "core" and different components; and thirdly, mixing the water-reducing component with a mud-inhibiting component, keeping warm, and cooling to obtain the composite agent with water-reducing and mud-inhibiting effects. The composite agent increases the electrostatic repulsion of the cement particle surface, makes the cement particles more fully dispersed, improves the slump retention of the concrete, prolongs the setting time of the concrete, and has good water-reducing and retarding effects.

This utility model relates to the field of recycling devices, and more particularly to a device for recycling leftover concrete materials used in bridge construction, including a cleaning mechanism; a dust collection mechanism is provided on one side of the cleaning mechanism, and a screening mechanism is provided inside the cleaning mechanism. This utility model allows for multi-angle washing of materials and filters through the cleaning mechanism, and the dust collection mechanism reduces dust spillage during construction. It solves the problems of existing devices lacking dust collection measures during feeding and screening, resulting in easily stirred-up concrete powder and cement particles, leading to excessive dust concentration at the construction site, inability to cover the complex surfaces of materials, soil residue causing excessive mud content in recycled aggregates, the need for continuous high-pressure water spraying from fixed nozzles resulting in low water resource utilization, and the easy trapping of sand, gravel, and cement lumps in the leftover concrete in the pores of traditional fixed screens.

This invention relates to a high-strength concrete, its preparation method, and its application, belonging to the field of building materials technology. It comprises 1300-1340 parts coarse aggregate, 820-860 parts fine aggregate, 320-360 parts cement, 130-140 parts fly ash, 1.2-2.5 parts quaternized amylopectin, 0.2-0.5 parts malic acid, 70-90 parts steel fiber, 2.5-3 parts water-reducing agent, 0.25-0.45 parts crosslinking synergist, and 120-130 parts water. The crosslinking synergist includes polyacrylic acid-grafted polyethylene glycol and potassium hydrogen tartrate. The polyacrylic acid-grafted polyethylene glycol and quaternized amylopectin form a polyelectrolyte complex, improving the uniformity of steel fiber dispersion. Potassium hydrogen tartrate creates a pH buffer environment on the surface of cement particles, enhancing the esterification and crosslinking efficiency of starch and malic acid. This results in high-strength concrete possessing high strength, crack resistance, toughness, and long-term durability.

This invention provides a technology for growing cement particle flocs in a method for producing mortar and fresh concrete. [Solution] First, a mixture of cement and fine aggregate is obtained by mixing cement with fine aggregate having a surface moisture content of 2% or more and 5% or less according to the surface moisture content test method specified in JIS A 1111:2015 (pre-mixing step S2). Next, the mixture is left to stand for a predetermined time (standing step S3). After that, water and admixture are added to the mixture and kneaded (first kneading step S5). In the pre-mixing step S2, the water contained in the fine aggregate causes the cement particles to form flocs. Furthermore, by leaving the mixture to stand after the pre-mixing step S2, the flocs can be grown. This reduces the specific surface area of ​​the cement. As a result, the amount of adsorption of the admixture to the cement particles can be suppressed in the first kneading step S5.

The present application relates to the technical field of civil engineering materials, and provides a protective coating for a concrete structure surface and a construction method thereof, the protective coating comprising: component A and component B; the component A and the component B are composed in a mass ratio of 3:1-5:1; the component A comprises: a polyurea polymer, an acrylate copolymer, a flame retardant, a defoaming agent and a leveling agent; the component B comprises: an inorganic cementitious material, a fiber, a nano filler and a curing agent; the acrylate copolymer in the component A cooperates with the curing agent in the component B, so that the mixed coating is quickly surface-dried under light or oxidation-reduction conditions. The present application activates the crosslinking of the acrylate double bond through a photoinitiator, and simultaneously forms an interpenetrating network structure through physical entanglement of the polyurea resin, thereby achieving 3-second surface drying without the need for heating; cement particles are enriched at the bottom of the coating to improve adhesion, the fiber is distributed in the surface layer to resist cracking, and the nano filler fills the interface micropores to improve impermeability.

The utility model discloses a concrete production wastewater air floatation tank with automatic water level adjusting function, and the device comprises a tank body, a water inlet pipe is arranged at the lower part of the tank body, an overflow groove is arranged at one side of the upper part of the tank body, a liquid level monitoring groove is arranged at the other side of the upper part of the tank body, and a scraper is arranged on the tank body, a floating plate with a floating block is arranged in the overflow groove, a baffle is arranged at one side of the floating plate, the baffle is attached to the side wall of the overflow groove and blocks the water outlet on the side wall, and the device is also provided with guiding, sealing and cleaning components. The device can automatically adapt to the fluctuation of the discharge amount of the concrete production wastewater, stably maintain the water level in the tank through the cooperation of the floating plate and the baffle, ensure that the scraper efficiently scrapes off the floating dregs containing cement particles, facilitate the cleaning of the residues and the blocking of the large impurities, reduce manual intervention, improve the wastewater treatment efficiency and the raw material recovery effect, and be suitable for the treatment of the concrete production wastewater.

The present application adopts biomass charcoal-cement composite material as an electrode, and proposes a preparation method of biomass charcoal-cement electrode material and a full solid-state super capacitor.Compared with traditional carbon-based materials (such as carbon black, carbon nanotubes and carbon fibers), biomass charcoal, as a kind of carbon material prepared from renewable resources, overcomes the problems of cement particle hydration obstruction, pore and microcrack and the like caused by strong surface hydrophobicity of traditional carbon materials, and realizes the transformation of raw materials from non-renewable to renewable.In addition, the production process of biomass charcoal is simple, the raw materials are widely sourced, and the process conforms to the concept of green and sustainable development, has low energy consumption and cost, and provides an important solution for the sustainable application of carbon materials.The process of the present application conforms to the guidance of green manufacturing and circular economy, and has good environmental friendliness and large-scale application potential.

The application discloses a phosphoric acid group polycarboxylic acid water reducing agent and a preparation method thereof, and relates to the technical field of phosphoric acid group polycarboxylic acid water reducing agents. The phosphoric acid group polycarboxylic acid water reducing agent is a copolymer formed by free radical copolymerization of an unsaturated polyether macromonomer, an unsaturated carboxylic acid monomer and an unsaturated phosphate monomer, wherein the unsaturated phosphate monomer is a compound R 1 -O-P(O)(OH) 2， wherein R 1 is an alkenyl group or a (methyl)acryloyloxy alkyl group containing a carbon-carbon double bond. By introducing a phosphoric acid group (P(O)(OH)2) with strong polarity and high complexing capacity into the molecular chain of polycarboxylic acid, compared with the traditional PCE containing only carboxyl groups, the phosphoric acid group can form stronger chemical bonding and complexing with cement hydration products (such as Ca2+), thereby enhancing the adsorption strength and stability of the polymer on the surface of cement particles, and improving the dispersibility and dispersion retention of the water reducing agent.

This invention discloses a multi-arm polymer cement grinding aid, its preparation method, and its application. The preparation method involves mixing tetrahydroxyethyl ethylenediamine, an amino mercapto acid compound, and a polymerization inhibitor, stirring, and heating to 100–120°C. A catalyst and a dehydrating agent are added, and the mixture undergoes esterification for 3–8 hours. The resulting product is purified to obtain a primary amine chain transfer agent. Next, amino polyethylene glycol methyl ether, a diunsaturated carboxylic acid or anhydride, the primary amine chain transfer agent, and water are mixed, stirred, and heated to 30–50°C. An initiator is added, and simultaneously, an aqueous solution of unsaturated polyol ether and a reducing agent are added dropwise. The mixture is then kept at 50–60°C for 1–2 hours to obtain the multi-arm polymer cement grinding aid. This invention, considering the characteristics of vertical mill processes and the relationship between cement particle morphology and performance, utilizes the designability of organic molecular structures to synthesize a grinding aid that can stabilize the vertical mill material layer, improve grinding efficiency, increase the sphericity of cement particles ground in the vertical mill, reduce the water requirement for the standard consistency of cement ground in the vertical mill, improve the fluidity of cement slurry ground in the vertical mill, and increase cement strength.