180 results about "Macromonomer" patented technology

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 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.

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 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.

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.

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 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.

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.

A light tunable lens (LAL) that suppresses non-target optical power drift is described. These LALs comprise a polymeric silicone network injected with a removable macromonomer, a non-switchable ultraviolet absorber, a photoinitiator, and a front protective layer comprising a switchable ultraviolet absorber. The LAL is phototunable by shaped illumination that activates a photoinitiator that induces polymerization of the movable macromonomer, thereby changing the optical power of the LAL. The LAL can accommodate an oxygen concentration of 0.5 to 20 ppm; and the ratio of the oxygen concentration multiplied by the oxygen-driven photoinitiator quenching rate to the movable macromonomer concentration multiplied by the photoinitiator-driven polymerization increase rate is greater than 10. Some of these LALs include a non-switchable ultraviolet absorber in the front protective layer; or a free radical scavenger; or a monofunctional or sterically hindered movable macromonomer; or a switchable photoinitiator, or an anchored photoinitiator.

This invention relates to the field of water-soluble polymer materials technology, and discloses a comb-shaped ternary polymer and its preparation process. The polyacrylamide is polymerized from a backbone monomer, anionic monomer, comb-shaped macromolecular monomer, and optional functional reinforcing monomers under the action of a redox and azo-based composite initiation system. The preparation process includes solution preparation and neutralization, deoxygenation and temperature control, adiabatic polymerization, and post-treatment steps, employing a control strategy combining low-temperature initiation and adiabatic temperature rise polymerization. This invention effectively overcomes the defects of traditional linear polymers—low viscosity retention and poor shear resistance—in high-temperature and high-salt environments by introducing comb-shaped side chains to create a steric hindrance effect. The resulting product possesses ultra-high molecular weight, low water-insoluble content, and excellent solubility, exhibiting excellent salt-resistant thickening advantages and mechanical stability, meeting the oil displacement requirements of harsh reservoir environments.

The present disclosure provides, in some aspects, macromonomers of Formula (I), and salts thereof; methods of preparing the macromonomers, and salts thereof; Brush prodrugs (polymers); methods of preparing the Brush prodrugs; compounds of Formula (II); conjugates of Formula (III), and salts thereof; pharmaceutical compositions comprising a Brush prodrug, or a conjugate or a salt thereof; kits comprising: a macromonomer or a salt thereof, a Brush prodrug, a compound, a conjugate or a salt thereof, or a pharmaceutical composition; methods of using the Brush prodrugs, or conjugates or salts thereof; and uses of the Brush prodrugs, and conjugates or salts thereof. These chemical entities may be useful in delivering pharmaceutical agents to a subject or cell.

This invention relates to the field of building materials technology, and particularly to a viscosity-reducing polycarboxylate superplasticizer and its preparation method. The viscosity-reducing polycarboxylate superplasticizer uses polyethylene glycol dicyclopentenyl ether methacrylate as the macromonomer, combined with 2-methacryloyloxyethyl phosphocholine, 4-vinylphenylboronic acid, and polyethylene glycol phenyl ether methacrylate as small monomers, prepared via free radical polymerization. Finally, it undergoes freeze-drying and grinding to obtain the target powder product. When the prepared superplasticizer is added to concrete mixtures, it swells and unfolds into a comb-shaped polymer under mechanical stirring and alkaline conditions. Through PEG long side-chain lubrication and steric hindrance, the regulation of surface tension / interfacial energy by phosphocholine groups, and the selective adsorption of borate groups, the initial viscosity is significantly reduced, the viscosity increase over time is controlled, and segregation and bleeding are effectively suppressed, making it suitable for various cementitious systems.

The invention provides a macromonomer for preparing a polycarboxylate superplasticizer as well as a preparation method and application of the macromonomer. The macromonomer for preparing the polycarboxylate superplasticizer is obtained by grafting a sulfonate group and quaternary ammonium salt on a terminal hydroxyl group of ethylene glycol monovinyl polyethylene glycol ether. The polycarboxylic acid water reducing agent prepared by copolymerizing the macromonomer for preparing the polycarboxylic acid water reducing agent with acrylic acid and hydroxyethyl methylacrylate is high in dispersion efficiency, strong in slump retaining property and good in adaptability to a complex system.

The embodiment of the invention provides an asymmetric brush polymer and a preparation method thereof. The preparation method comprises the following steps: step S1, enabling 5-norbornene-2-exo, 3-exo-dimethanol to react with 2-(dodecyl thiocarbon thio) propionic acid, so as to obtain a norbornene derivative with 2-(dodecyl thiocarbon thio) propyl ester and a hydroxyl unit at the same time; s2, enabling the norbornene derivative to react with caprolactone and methyl acrylate by utilizing a light irradiation reaction system in the presence of a ring-opening polymerization catalyst and a photocatalyst, so as to obtain an asymmetric macromonomer containing polymethyl acrylate and polycaprolactone block units at the same time; s3, enabling the asymmetric macromonomer to react in the presence of a Grubbs catalyst, so as to obtain the asymmetric brush type polymer. By applying the technical scheme provided by the invention, the technical problems that in the prior art, the synthesis steps of the asymmetric brush type polymer are tedious, multiple purification is needed, and the molecular weight and distribution of the polymer are difficult to effectively control can be effectively solved.

The present invention relates to the technical field of polymer polyols, and disclosed are a high-functional composite macromolecular monomer, a preparation method therefor, and a use thereof. A technical solution thereof is: S1, reacting an initiator with an epoxy compound under the action of a catalyst, to obtain a polyether polyol intermediate; S2, using the polyether polyol intermediate and a hyperbranched polyester polyol as a composite initiator, reacting with an epoxy compound under the action of a catalyst, to produce a polyether / polyester ether polyol; S3, reacting the polyether / polyester ether polyol with an unsaturated isocyanate under the action of a catalyst, to generate a high-functional composite macromolecular monomer. The present invention increases the functionality of the macromolecular monomer by means of the initiator, increases the dispersibility of the macromolecular monomer in a polymer polyol, improves the stability of styrene–acrylonitrile copolymer particles in a polymer polyol, and reduces the viscosity of a polymer polyol; introducing a polyester system into the macromolecular monomer structure increases the proportion of hydrophobic groups in polymer polyols, reducing the occurrence of hydrogel formation upon exposure to water.

The present application relates to a kind of anti-mud slump type polycarboxylic water reducer and its preparation method, the polycarboxylic water reducer preparation raw material includes: polyether macromonomer 80~100 parts;Rigid unsaturated monomer 1~2 parts;Crosslinking monomer 1~2 parts;Unsaturated sulfonic acid monomer 2~3 parts;Unsaturated acid 10~15 parts;Oxidant 0.5~2 parts;Reducing agent 0.5~2 parts;And chain transfer agent 1~2 parts.The present application uses ethylene glycol monovinyl ether polyoxyethylene ether as polyether monomer, introduces crosslinking monomer itaconic acid polyethylene glycol ester, forms crosslinked molecular structure, and introduces (4- vinylphenyl) trimethoxysilane and other rigid structure, avoids clay's wipe layer adsorption, reduces clay surface adsorption site, weakens the competitive adsorption effect of clay to polycarboxylic water reducer, greatly improves anti-mud performance and slump performance.

The invention discloses a high-solid-content low-viscosity hydroxy acrylic acid aqueous dispersion and a preparation method thereof, and relates to the technical field of aqueous dispersions. The hydroxyl acrylic acid water-based dispersion is a dispersion system of a polymer in a water phase, and reaction monomers of the polymer comprise 70-90 parts of (methyl) acrylate monomers, 5-20 parts of hydroxyl acrylate monomers and 5-30 parts of hydroxyl macromonomers; the hydroxyl macromonomer is a (methyl) acrylated polyol oligomer, and the molecular weight Mn of the hydroxyl macromonomer is 250-600. The hydroxy acrylic acid water-based dispersion can increase the solid content and reduce the emulsion viscosity, and can be directly used for preparing environment-friendly high-performance water-based paint or adhesive; meanwhile, use of organic solvents is reduced in the production process, and VOC emission is reduced.

The invention relates to an anti-freezing ester rapid dispersing material and a preparation method thereof. The anti-freezing ester rapid dispersing material is prepared from the following raw materials: 100 parts of ester macromonomer; 3-5 parts of a polyhydroxy esterified monomer; 5-10 parts of a first unsaturated acid monomer; 2-5 parts of an unsaturated aldehyde monomer; 0.8 to 3.0 parts of an oxidizing agent; 0.5 to 2.0 parts of a reducing agent; 0.8 to 2.5 parts of a chain transfer agent; and water. According to the invention, unsaturated aldehyde group monomers are introduced, so that the molecular structure contains aldehyde groups and amino groups, crystal growth needs highly ordered repetitive units, and introduction of aldehyde groups breaks the repetitive units, so that the repetitive units cannot be arranged and combined according to an optimal mode required by crystal formation, thereby inhibiting crystallization and playing an anti-freezing role.

The invention provides a multifunctional polycarboxylic acid mother solution, a preparation method thereof and a construction method of a terrace of the multifunctional polycarboxylic acid mother solution. The water-based adhesive is prepared from the following raw materials in parts by weight: 6 to 10 parts of acrylic acid, 1.5 to 3 parts of sodium methallyl sulfonate, 0.8 to 1.8 parts of acrylamide, 28 to 40 parts of fluorosilicone-bio-based composite modified polyether macromonomer, 3 to 8 parts of amidated nano silicon dioxide-polyglutamic acid-montmorillonite compound, 0.6 to 1.2 parts of composite initiator, 0.3 to 0.6 part of composite chain transfer agent and 35 to 45 parts of deionized water. The polycarboxylic acid mother liquor obtained by the invention has the advantages of good workability, good fluidity, good slump loss resistance and convenience in construction, the surface of a poured floor is smooth, uniform and attractive, and cracks can be obviously reduced.

The invention relates to a bio-based block copolymer water reducing agent and a preparation method thereof. The bio-based block copolymer water reducing agent is prepared from the following raw materials: an unsaturated acid monomer, a functional anchoring monomer, a polyether macromonomer and a bio-based rigid monomer. The general formula of the bio-based rigid monomer is as follows: R1-O-CO-R2-CH = CH2; wherein R1 is a tannic acid residue, a lignin phenolic group or a rosin group, and R2 is a C1-C4 alkylene group. The bio-based block copolymer water reducer product has viscosity reduction, dispersion and enhancement properties, can maintain excellent fluidity and strength stability under a low mixing amount, and avoids the contradiction between fluidity and strength in a traditional system.

The present application belongs to the technical field of polymer and luminescent material, and more particularly relates to a room-temperature phosphorescent block polymer containing triphenylene-modified triarylamine groups and a preparation method and application thereof. According to the molar proportion, the room-temperature phosphorescent block polymer comprises: (a) 0.1-10% of a structural unit from an organic phosphorescent molecular monomer; (b) 40-48% of a structural unit from a macromonomer; and (c) 50-55% of a structural unit from a double-azide monomer. The room-temperature phosphorescent block polymer provided by the present application is polymerized by using a room-temperature phosphorescent molecule with a diacetylenyl group and a triphenylene structure, a macromonomer and a double-azide monomer as structural monomer units. Compared with the existing polymer generated by a physical blending method, the room-temperature phosphorescent block polymer synthesized by the present application has more excellent phosphorescent emission intensity and lifetime.

The application belongs to the field of building materials, and provides a polycarboxylic acid water reducing agent, a preparation method and application thereof. The preparation method of the polycarboxylic acid water reducing agent comprises: in the presence of a viscosity regulator, an initiator, a molecular weight regulator and water, performing a polymerization reaction on comonomers including an unsaturated macromonomer, an unsaturated monomer I and an unsaturated esterification product to form a polycarboxylic acid; wherein the unsaturated esterification product is a reaction product of an unsaturated monomer II and a hydroxyl polycarboxylic acid; the unsaturated monomer I is at least one of an unsaturated carboxylic acid, an unsaturated carboxylic acid salt and an unsaturated carboxylic anhydride, the unsaturated monomer II is an unsaturated carboxylic acid and / or an unsaturated carboxylic anhydride, and the viscosity regulator is a trivalent cation salt. The preparation method can prepare a polycarboxylic acid water reducing agent with high solid content and low viscosity.

A resin composition may contain: a (meth)acrylic copolymer containing a structural unit (A) based on a specific metal atom-containing polymerizable monomer (a) and a structural unit (B) based on a specific polysiloxane block-containing polymerizable monomer (b); and an organic solvent, wherein a content of the structural unit (A) is from 5 to 35 mass %, a content of the structural unit (B) is from 35 to 75 mass %, and a content of the structural unit based on a (meth)acrylic macromonomer is less than 13 mass % relative to a total mass of all structural units constituting the (meth)acrylic copolymer, a weight-average molecular weight of the (meth)acrylic copolymer is 2000 or more and 6500 or less, and a VOC content is 500 g / L or less.

The invention belongs to the technical field of building materials, and provides a double-tailed polyether macromonomer, a polycarboxylate superplasticizer and a preparation method and application of the double-tailed polyether macromonomer and the polycarboxylate superplasticizer. The preparation method comprises the following steps: by taking single protection dihydric alcohol as a raw material, carrying out reaction on the single protection dihydric alcohol and first alkylene oxide, carrying out deprotection reaction, carrying out reaction on the single protection dihydric alcohol and second alkylene oxide, and carrying out reaction on the single protection dihydric alcohol and an end-capping reagent with an alkene-terminated structure, so as to obtain the acid-catalyzed asymmetric double-tailed polyether macromonomer; the molecular weight distribution and spatial configuration of the two sides of the double-tailed polyether macromonomer can be accurately controlled, and after the prepared double-tailed polyether macromonomer is used for preparing the polycarboxylate superplasticizer, the polycarboxylate superplasticizer has the functions of water reduction and segregation resistance.

The application provides an environment-friendly self-preservative polycarboxylic acid water reducing agent and a preparation method and application thereof.The water reducing agent is prepared by free radical copolymerization of 100 parts of polyether macromonomer, 10-15 parts of unsaturated carboxylic acid and derivatives thereof, 0.1-0.5 parts of quaternary ammonium salt functional monomer, 0.05-0.25 parts of imidazole ring containing unsaturated monomer, 0.3-0.9 parts of performance compensation monomer, an initiator and water by weight. The quaternary ammonium salt and imidazole ring double-effect bacteriostatic groups are covalently grafted on the main chain to realize the endogenesis of the preservative function, completely solve the pain point that the traditional external preservative is easy to degrade and invalid, and give the product long-acting and wide-spectrum bacteriostatic capacity. Meanwhile, the MPEGAc is innovatively introduced, the polar and long and short chain complementary effect is utilized, and the molecular chain curling caused by the cationic group and the water reducing performance loss are precisely compensated. The product has high water reducing rate, excellent slump retention and persistent self-preservative stability.