777 results about "Unsaturated monomer" patented technology

The present invention provides a slurry composition comprising (a) an electrochemically active material and / or an electrically conductive agent; and (b) a binder comprising (i) a polymer comprising a fluoropolymer dispersed in a liquid medium; and (ii) a polymer comprising an addition polymer comprising constitutional units comprising the residue of a heterocyclic group-containing ethylenically unsaturated monomer. The present invention also provides electrodes and electrical storage devices.

The invention provides a high-temperature thermal expansion microsphere with rapid foaming response and a preparation method of the high-temperature thermal expansion microsphere. The high-temperature thermal expansion microsphere comprises an olefinic unsaturated monomer, the olefinic unsaturated monomers comprise the following components in percentage by weight: 40 to 60 percent of acrylonitrile monomers, 10 to 20 percent of acrylic acid monomers, 10 to 20 percent of acrylamide monomers and 5 to 30 percent of cage type polysilsesquioxane monomers containing double-bond monofunctional groups; the double-bond monofunctional polyhedral oligomeric silsesquioxane monomer is used for participating in polymerization to form a microsphere shell. The foaming response speed of the microspheres can be remarkably improved, and the microspheres have high foam breaking temperature and high expansion performance.

The invention relates to a method for producing a polymer composition, in which a silane-modified polymer is polymerized by free-radical chain polymerization with an ethylenically unsaturated monomer and a further ethylenically unsaturated polymer having a free-radical photoinitiator group in a polyol or a prepolymer having terminal isocyanate groups, and to a polymer composition produced by this process. The invention also relates to a method for producing moisture-curable polyurethane hot melt adhesive compositions, 1K polyurethane adhesives and 2K polyurethane adhesives on the basis of the polymer composition according to the invention. The invention also relates to moisture curable polyurethane hot melt adhesive compositions, 1K polyurethane adhesives and 2K polyurethane adhesives produced by these methods.

A regenerated collagen fiber treatment method according to the present invention comprises the following step (i). Step (i): Regenerated collagen fibers having an underwater fiber swelling rate of 200% or greater as calculated by equation (1) are immersed in a fiber treatment agent containing component (A). (A): A copolymer that contains a structural unit derived from an unsaturated monomer having a carboxyl group or a salt thereof and a structural unit derived from an aromatic vinyl compound, and has an acid value of 100 mgKOH / g or greater and a weight average molecular weight of 1500-15000. (1): Underwater fiber swelling rate (%) = [(w1-w2) / w2]×100 (in the equation, w1 represents the mass (g) of the fibers, the mass being measured after placing 1.0 g of the fibers into a container filled with 100 g of ion-exchanged water, sealing the container, immersing the whole sealed container in a water bath at 40°C for 30 minutes, and then removing the fibers from the container, and subjecting the fibers to centrifugal dehydration for 1 minute at a centrifugal force of 220 [×g], and w2 indicates the mass of the fibers, the mass being measured after placing the fibers, for which the mass (w1) has been measured, on a filter paper and drying the fibers at 105°C for 3 hours).

A photosensitive composition of a developable relief precursor includes at least one ethylenically unsaturated monomer as component E, at least one photoinitiator or photoinitiator system as component P, at least one water soluble and / or water dispersible binder as component B, and optionally, one or more additives as component A. Component E includes at least one ionic group and component E is present in an amount of 0.1 to 30 wt %, based on the total weight of the photosensitive composition.

The invention belongs to the technical field of polymers and lithium battery materials, and discloses a water-based silicon-carbon negative electrode binder for a lithium battery as well as preparation and application of the water-based silicon-carbon negative electrode binder. The water-based silicon-carbon negative electrode binder is obtained by copolymerizing the following monomers in percentage by mass: 30-50% of a hydrophilic monomer, 20-40% of a hydrophobic monomer and 10-30% of a functional monomer, the hydrophilic monomer is an unsaturated monomer containing carboxylic acid, amide and sulfonic acid groups; the hydrophobic monomer is at least one of acrylonitrile, methacrylonitrile, acrylate and methacrylate; the functional monomer is at least one of vinyl polysiloxane, sodium allysulfonate, sodium methallyl sulfonate, sodium p-styrenesulfonate and N-vinyl pyrrolidone. The water-based silicon-carbon negative electrode binder disclosed by the invention can enhance the binding force between silicon particles on the surface of a silicon-based negative electrode material and a current collector; meanwhile, the volume expansion of the silicon negative electrode material can be inhibited; the cycle performance is improved.

In order to solve the problems that in the prior art, in the laser coating preparation process, high-temperature mold pressing is needed due to the high softening point of matrix resin, and the requirements for the technology and equipment are high, the laser transfer coating comprises the matrix resin, and the matrix resin comprises an acrylate monomer and a first functional monomer; the first functional monomer is prepared from one or more of o-phenyl phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate, and the second functional monomer is prepared from one or more of o-phenyl phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate; the matrix resin further comprises a second functional monomer, and the second functional monomer comprises an unsaturated monomer containing a heterocyclic side group or a polar group. According to the laser transfer coating provided by the invention, after the acrylate monomer and the first functional monomer are combined, not only is good film-forming property provided for the coating, but also the coating has relatively good optical property, reflection and refraction of light can be regulated and controlled on a microscopic level, and the visual effect of coating of the laser transfer coating is enhanced.

A detergent composition containing water, a component (A) which is a silica capsule enclosing a functional agent, and a component (B) which is a cationic polymer having a weight average molecular weight of 500,000 or more and 5,000,000 or less and obtained by polymerizing an unsaturated monomer having a cation group (excluding those enclosed in the silica capsule of the component (A)).

The invention discloses silicon-based flame-retardant high-heat-resistance hydrocarbon resin as well as a preparation method and application thereof in preparation of a copper-clad plate, and belongs to the technical field of electronic resin synthesis. The preparation method of the silicon-based flame-retardant high-heat-resistance hydrocarbon resin comprises the following steps: S1, adding a first monomer, organic silicon and a catalyst into a reaction container, then adding dehydrated toluene and fully stirring, and after the reaction is finished, carrying out silica gel adsorption, filtration and reduced pressure distillation to obtain a silicon-containing unsaturated monomer; s2, sequentially adding a first monomer, a silicon-containing unsaturated monomer, a second monomer and a third monomer into a reaction container, then adding a solvent A and a cationic initiator, fully stirring, and washing and distilling after the reaction is finished to obtain the silicon-based flame-retardant high-heat-resistance hydrocarbon resin. The prepared silicon-based flame-retardant high-heat-resistance hydrocarbon resin has excellent dielectric property, heat resistance, mechanical strength and flame retardance, and can endow a copper-clad plate with excellent dielectric property, heat resistance, mechanical strength, flame retardance and the like when being applied to preparation of the copper-clad plate.

The invention relates to a low-odor two-component composition as well as a preparation method and application thereof, and belongs to the technical field of woodware seal primers. The low-odor double-component composition disclosed by the invention comprises a component A and a component B, wherein the component A comprises epoxy resin and epoxy silane; in the component A, the weight of the epoxy silane accounts for 0-60 wt% of the total weight of the epoxy resin and the epoxy silane; the component B comprises an addition product, and the addition product is a Michael addition product obtained by reacting an unsaturated monomer M and amino silane Q according to a molar ratio of 1: (1.6-2.4). The low-odor two-component composition disclosed by the invention is extremely low in odor, very fast in early-stage polishing property establishment, good and excellent in surface effect and flexibility, free of an organic solvent or only low in organic solvent content, and capable of being widely applied to a woodware seal primer as a composition so as to improve the performance of a woodware coating.

A sheet molding compound (SMC) composition formulation including a curable resin, such as unsaturated polyester of vinyl ester, in an ethylenically unsaturated monomer; a low profile additive, in a curable solvent; and an intumescent additive, such as melamine polyphosphate or ethylene diamine phosphate. An article formed of the SMC composition formulation experiences no more than a 100% increase in thickness as compared to an initial thickness of the article after exposure to a flame. The low profile additive is present in the composition and the intumescent additive is present in the composition. The resulting article has a char strength at 3 mm thickness of between 100 and 1,000 Newtons.

The invention belongs to the technical field of polyurethane, and particularly relates to multi-element synergistic flame-retardant polymer polyol and a preparation method thereof. The flame-retardant polyether polyol is prepared from phosphorus-halogen mixed flame-retardant basic polyether polyol, a halogen-containing flame-retardant vinyl unsaturated monomer, a silicon-containing flame-retardant vinyl unsaturated monomer, a nitrogen-containing modified polyether dispersant, styrene, acrylonitrile, an initiator and a chain transfer agent through reaction. The halogen-containing monomer introduced into the POP polymerization monomer directly participates in free polymerization, and cooperates with the flame-retardant elements in the basic polyether, so that the content of the flame-retardant elements in the POP can be effectively increased, and the flame retardance is improved. A vinyl silicon structure is added in a POP polymeric monomer, and a silicon element is introduced into a molecular chain, so that the flame retardance is improved, the hydrophobicity of POP can be improved, and the viscosity of the composite material is reduced. The macromolecular nitrogen-containing dispersing agent forms a nitrogen-phosphorus-bromine ternary synergistic flame-retardant system by adopting a DMC catalytic process and a polyurethane synthesis technology, so that the flame retardance of POP is further improved.

Process for preparing protective colloid-stabilized polymers of ethylenically unsaturated monomers along with uses for the same. The process includes admixing aqueous dispersions of protective colloid-stabilized polymers of ethylenically unsaturated monomers with one or more drying aids and then drying the mixture. Where one or more salts of organic compounds containing 1 to 10 carbon atoms and optionally one or more protective colloids are used as drying aids. Where 0.1% to 20% by weight based on the dry weight of the aqueous dispersions of the protective colloid-stabilized polymers of salts of organic compounds containing 1 to 10 carbon atoms is used as drying aids.

The present invention therefore relates to aqueous polymer latices of copolymers obtainable by aqueous emulsion polymerisation of ethylenically unsaturated monomers M, which comprise i. 5 to 90% by weight, in particular 10 to 70% by weight, especially 10 to 50% by weight, based on the total amount of monomers M, of a monomer M1, which is 1-hexyl acrylate; ii. 0 to 70% by weight, based on the total amount of monomers M, of at least one monomer M2, which is selected from C2-C5-alkyl esters of acrylic acid, except for tert-butyl acrylate, C7-C20-alkyl esters of acrylic acid and C5-C20-alkyl esters of methacrylic acid and mixtures thereof; iii. 5 to 70% by weight, based on the total amount of monomers M, of at least one monomer M3, which is selected from tert-butyl acrylate, C1-C4-alkyl esters of methacrylic acid, C5-C20-cycloalkyl esters of acrylic acid, C5-C20-cycloalkyl esters of methacrylic acid, C5-C20-cycloalkylmethyl esters of acrylic acid, C5-C20-cycloalkylmethyl esters of methacrylic acid, where cycloalkyl in the aforementioned monomers is mono-, bi- or tricyclic and where 1 or 2 nonadjacent CH2 moieties of cycloalkyl may be replaced by oxygen atoms and where cycloalkyl may be unsubstituted or carry 1, 2, 3 or 4 methyl groups, and monovinyl aromatic monomers, methylene-gamma-butyrolactone and mixtures thereof; where the total amount of monomers M1 and M2 is in the range from 10 to 90% by weight, based on the total amount of ethylenically unsaturated monomers M, and where the total amount of monomers M1, M2 and M3 is at least 90% by weight, based on the total amount of ethylenically unsaturated monomers M. The present invention also relates to a process for producing the aqueous polymer latices of the present invention. The present invention also relates to the use of these polymer latices as binders in waterborne coating compositions and waterborne adhesive compositions, in particular as binders in waterborne coating compositions.

The application belongs to the technical field of high polymer materials, and particularly relates to an ion conductive hydrogel, a sensor and a preparation method and application thereof. The ion conductive hydrogel comprises a double-network hydrogel and ion salts and alcohol dispersed in the double-network hydrogel; the first network of the double-network hydrogel is formed by cross-linking of sodium alginate, and the second network is formed by radical polymerization of unsaturated monomers. The second network is formed by radical polymerization of unsaturated monomers, and the double-network hydrogel is formed by cooperation of sodium alginate, so that the ion conductive hydrogel has excellent mechanical properties. The ion salts are added in the double-network hydrogel, and especially, an alcohol / water binary solvent system is introduced. Due to strong ion hydration and strong hydrogen bond interaction between water molecules and alcohol, ice crystallization is inhibited, so that the hydrogel still has good flexibility and conductivity below zero degrees.

The invention relates to a mud-resistant slump-retaining polycarboxylic acid water reducer and a preparation method thereof. The polycarboxylic acid water reducer is prepared from the following raw materials: 80-100 parts of polyether macromonomer; 1-2 parts of a rigid unsaturated monomer; 1-2 parts of a crosslinking monomer; 2-3 parts of an unsaturated sulfonic acid monomer; 10 to 15 parts of unsaturated acid; 0.5-2 parts of an oxidizing agent; 0.5-2 parts of a reducing agent; and 1-2 parts of a chain transfer agent. According to the invention, ethylene glycol monovinyl ether polyoxyethylene ether is adopted as a polyether monomer, a cross-linking monomer itaconic acid polyethylene glycol ester is introduced to form a cross-linked network-shaped molecular structure, and rigid structures such as (4-vinyl phenyl) trimethoxysilane are introduced, so that friction layer adsorption of clay is avoided, adsorption sites on the surface of the clay are reduced, and the adhesion of the clay is improved; the competitive adsorption effect of clay on the polycarboxylate superplasticizer is weakened, and the mud resistance and the slump loss resistance are greatly improved.

The invention relates to a non-fluorine binder and application thereof in the field of secondary batteries, and belongs to the technical field of battery binders. The technical problem to be solved by the invention is to provide the non-fluorine binder which has good solubility in NMP (N-Methyl Pyrrolidone). The binder comprises modified resin, and the modified resin is formed by polymerizing thermoplastic resin, a functional monomer and a nitrile group-containing unsaturated monomer. The binder has normal-temperature solubility in an NMP solvent, can improve the high-temperature tolerance of a material in a carbonic ester electrolyte and the binding force to a metal foil, can be applied to the fields of lithium ion battery edge coating protection glue, conductive dispersion glue and positive and negative electrode binders, can be independently used, can also be used in cooperation with other binders, and can be applied to the fields of lithium ion battery edge coating protection glue, conductive dispersion glue and positive and negative electrode binders. The fluorine resin has outstanding price and environmental advantages, and can replace traditional fluorine resin to be applied to lithium ion batteries.

Water-based pressure sensitive adhesive compositions are disclosed comprising (a) an acrylic emulsion having a glass transition temperature of less than or equal to 20° C., (b) optionally, a dispersant or a silane-containing compound, and (c) an ethylene or propylene copolymer emulsion. In some embodiments, (a) comprises from 75 to 99 wt % of the compositions, (b), when present, comprises from 0.1 to 5 wt % of the compositions, and (c) comprises from 0.1 to 25 wt % of the composition, each based on the dry weight of the compositions. Methods for preparing water-based pressure sensitive adhesive compositions are also disclosed comprising emulsion polymerizing at least one unsaturated monomer, thereby forming an emulsion polymer having a glass transition temperature of less than or equal to −10° C. and blending the emulsion polymer together with a dispersant or silane-containing compound and an ethylene or propylene copolymer emulsion. Water-based pressure sensitive adhesives and pressure sensitive adhesive films are also disclosed.

The invention provides a viscosity reduction type concrete super plasticizer and a preparation method and application thereof.The super plasticizer is solid and is prepared from an unsaturated monomer a, an unsaturated monomer b and an unsaturated monomer c through free radical polymerization under the microwave condition, the unsaturated monomer a is methacrylic acid or methyl alkenyl phosphonic acid monomer, and the unsaturated monomer b is methacrylic acid or methyl alkenyl phosphonic acid monomer. The unsaturated monomer b is a monomer containing a rigid ring, the rigid ring is an aromatic ring or an imidazole ring or a pyridine ring, and the unsaturated monomer c is an unsaturated polyether monomer containing a benzene ring. A methyl group and a rigid ring group are introduced into a main chain of the super plasticizer, so that the rigidity of a polymer is improved, the hydrophobicity is increased, the conformation of the polymer is changed, and a relatively thick water film layer is formed on the surface of cement particles; meanwhile, a branched structure side chain is introduced into the super plasticizer, so that the molecular size of the polymer can be remarkably increased, the steric hindrance effect of the polymer is more outstanding, the dispersing capacity is good, the thickness of a water film layer on the surface of cement can be increased, and the viscosity of concrete is further reduced.

The present invention relates to a biodegradable polymer composition formed by waterborne radical emulsion polymerization of monomers selected from ethylenically unsaturated monomers characterized in that, the polymer composition is composed of at least two different populations of particles, said populations differing in average particle size value by at least a factor of 1.5, wherein (a) a population P1 is constituted by particles having an average particle size of greater than 250 nanometers, said particles being constituted of polymer chains predominantly built of ethylenically unsaturated monomers, further comprising 0.5 to 50% by C weight of oligomer lactide 2-hydroxyethyl, methacrylate terminated macromonomer, based on the total weight of the monomers, and (b) a population P2, distinctive of P1 by average particle size value, is constituted by particles having an average particle size of less than or equal to 250 nanometers, said particles being constituted of polymer chains predominantly built of ethylenically unsaturated monomers, further comprising 0.5 to 50% by weight of oligomer lactide 2-hydroxyethyl, methacrylate terminated macromonomer, based on the total weight of the monomers, wherein said two different populations jointly constitute at least 70% by weight, preferably 90% by weight, of the total polymeric content within said composition.

This invention relates to a two-part adhesive composition, comprising a first part comprising at least one ethylenically unsaturated monomer, at least one non-polar styrenic block copolymer, and at least one curing promoter; and a second part comprising at least one initiator. The two-part adhesive composition exhibits excellent adhering strength to both metal substrate and plastic substrate.

The invention relates to the technical field of lithium metal batteries, and discloses a silane coupling agent modified Mxene-based solid-state polymer electrolyte, a solid-state lithium battery and a preparation method of the solid-state lithium battery. The silane coupling agent modified Mxene-based solid polymer electrolyte is prepared by uniformly mixing the raw materials and then heating and curing; the raw materials comprise the following components in percentage by weight: 0.2-1.6 wt% of silane coupling agent modified Mxene; 8-15 wt% of a lithium salt; 3 to 6 wt% of an acrylate unsaturated monomer; 0.01 to 0.05 wt% of an initiator; and the balance of solvent. According to the invention, the two-dimensional material MXene is introduced, so that the growth of lithium dendrites is effectively inhibited; abundant functional groups on the surface of MXene and a polymer skeleton generate a synergistic effect, rapid migration of Li < + > can be promoted, and a film is formed at an interface of a positive electrode and a negative electrode, so that the solid-state lithium battery can stably operate under extreme conditions of high and low temperatures, high magnification and the like; the MXene is subjected to surface modification through siloxane, so that the compatibility of the MXene in an electrolyte precursor solution can be improved, and the electronic conductivity of the MXene can be remarkably reduced, thereby enhancing the safety of the battery.

A pigment dispersion liquid containing a copolymer (A) having a first segment (a1) derived from a nitrogen-containing polymerizable unsaturated monomer having a tertiary amino group and / or a nitrogen-containing heterocyclic group, and a second segment (a2) derived from a polymerizable unsaturated monomer having a polyoxyalkylene chain, a hydrocarbon group-containing acidic compound (B), a pigment (C), and an aqueous solvent (D), and a hydrocarbon group-containing acidic compound (B) having a C5-23 saturated or unsaturated hydrocarbon group (b1) and at least one acid group (b2) selected from the group consisting of a carboxyl group, a phosphate group, a sulfonic acid group, and a phenol group.

The invention belongs to the technical field of oilfield chemistry, and particularly provides an environment-friendly oil-phase-free clean nano-microsphere and a preparation method of the environment-friendly oil-phase-free clean nano-microsphere. The nano microsphere is prepared from the following raw materials: 60 to 90 parts of an oil-free phase solvent, 50 to 70 parts of acrylamide, 25 to 35 parts of an anionic unsaturated monomer, 9 to 15 parts of a functional monomer, 3 to 7 parts of a cosolvent, 1 to 2 parts of modified nano silicon dioxide, 0.2 to 0.4 part of an initiator, 0.005 to 0.02 part of a cross-linking agent and 300 to 400 parts of distilled water. The nano-microsphere disclosed by the invention is good in expansion performance, excellent in high temperature resistance and salt resistance, excellent in deep profile control and displacement capacity, free of an oil-phase solvent, environment-friendly and pollution-free, and important support is provided for green transformation of oilfield exploitation.

The present invention provides a composition for forming a high-gloss coating film which exhibits good antifouling performance in spite of a relatively slow dissolution rate of the coating film, and which does not cause a coating film abnormality such as a crack even after being immersed in seawater for a long period of time.　The present invention specifically provides an antifouling coating composition which contains a copolymer A, a rosin ester B, and an antifouling agent C, wherein: the copolymer A is a copolymer of a monomer (a1) and an ethylenically unsaturated monomer (a2) other than the monomer (a1); the monomer (a1) is represented by general formula (1); and the rosin ester B is a reaction product of a polyhydric alcohol (b1) and rosin or a derivative thereof (b2).

Described herein is a polyester-polyurethane-poly(meth)acrylic hybrid dispersion obtainable by esterifying at least one polyurethane containing carboxyl groups, the at least one polyurethane having an acid number of more than 200 mg KOH / g to 400 mg KOH / g and at least one or more terminal carboxyl groups; with at least one polyester containing hydroxyl groups, the polyester having a hydroxyl number of 50 mg KOH / g to 300 mg KOH / g, to obtain a polyester-polyurethane; followed by polymerizing ethylenically unsaturated monomers at least including (meth)acrylic monomers by radical polymerization in the presence of the polyester-polyurethane where one or more solvents are present and / or employed, thereby obtaining the polyester-polyurethane-poly(meth)acrylic hybrid dispersion.

The invention relates to the technical field of 3D printing, in particular to hydrogel ink and a hydrogel photocuring 3D printing method. The hydrogel ink for 3D printing provided by the invention comprises the following raw materials in percentage by mass: 40-80% of an unsaturated monomer; 0.01%-3% of a photoinitiator; 20%-60% of a phase separation solvent; the phase separation solvent is a good solvent of an unsaturated monomer, and is a poor solvent of a polymer formed by polymerizing the unsaturated monomer. The phase separation solvent is used for dissolving the unsaturated monomer, and in the 3D printing process, the phase separation solvent can separate polymeric macromolecules formed by polymerization of the unsaturated monomer induced by the photoinitiator, so that the molded material obtained through printing is high in modulus, and the printing precision is improved.

Disclosed is a method for producing water-absorbent resin particles, the method comprising: forming a hydrogel polymer by polymerizing a water-soluble ethylenically unsaturated monomer through reverse-phase suspension polymerization in a reaction solution containing a surfactant having an HLB of 7-16; forming aggregated particles; extracting some water to form a concentrate; and surface cross-linking the aggregated particles in a mixture containing the concentrate and a surface crosslinking agent. The amount of an internal cross-linking agent is 0.093 mmol or less per mole of the water-soluble ethylenically unsaturated monomer. The polymer particles formed from the hydrogel polymer before forming the aggregated particles have a median particle size of 150 μｍ or more. The mixture is formed by mixing a surface crosslinking agent with a concentrate containing water at a moisture content of 15-50 mass% on the basis of the mass of the polymer.

A method for improving the water and / or oil resistance of a paper substrate comprising: i) providing a paper substrate; ii) applying to the paper substrate a water-based barrier coating composition having a solids content from 10 to 55 wt % (% by weight) and comprising from 50 to 95 wt % of an aqueous polymer dispersion having a solids content from 20 to 50 wt % and obtained by emulsion polymerization of: a) from 0 to 40% by weight of at least one ethylenically unsaturated monomer selected among styrene or substituted styrene, b) from 15 to 55% by weight of at least one ethylenically unsaturated monomer selected among C1-C10-alkyl (meth)acrylates or cycloalkyl (meth)acrylates, in the absence of ethylenically unsaturated acid monomers and in the presence of c) from 45 to 80% by weight of degraded starch having a molecular weight Mn of 500 to 30,000 Da.

The invention belongs to the field of building materials, and provides a polycarboxylate superplasticizer as well as a preparation method and application thereof. The preparation method of the polycarboxylic acid water reducer comprises the following steps: in the presence of a viscosity regulator, an initiator, a molecular weight regulator and water, carrying out polymerization reaction on comonomers including an unsaturated macromonomer, an unsaturated monomer I and an unsaturated esterification product to form polycarboxylic acid; wherein the unsaturated esterification product is a reaction product of an unsaturated monomer II and hydroxyl polycarboxylic acid; the unsaturated monomer I is at least one of unsaturated carboxylic acid, unsaturated carboxylate and unsaturated carboxylic acid anhydride, the unsaturated monomer II is unsaturated carboxylic acid and / or unsaturated carboxylic acid anhydride, and the viscosity modifier is trivalent cation salt. The preparation method provided by the invention can be used for preparing the polycarboxylic acid water reducer with high solid content and low viscosity.