517 results about "Radical polymerization" patented technology

The invention belongs to the technical field of drilling fluid, and particularly relates to a free radical polymerization water-based drilling fluid composition and a preparation method thereof. The invention relates to a core-shell composite particle-containing water reducer which comprises deionized water, salts (NaCl / KCl), alkalis (Na2CO3 and NaOH), barium sulfate and core-shell composite particles X. The particle is composed of a silicon dioxide core and a polymer shell layer, and the shell layer is formed by free radical copolymerization of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid and is covalently connected with the core through silanization treatment. Under the conditions of high salinity, strong alkali and high solid phase weighting, the drilling fluid simultaneously realizes the following effects: (1) high-density bearing and low-viscosity pumpability are realized; (2) compact plugging and water loss reduction and low formation damage flowback can be realized; and (3) stable rheology rock carrying, lubrication and friction resistance reduction. The problem that three aspects of performance are difficult to consider in the prior art is solved, and the drilling fluid is suitable for drilling of deep wells, ultra-deep wells and complex stratums and has remarkable industrial application value.

This application relates to the field of hydrogel electrolyte technology, specifically disclosing a modified sodium alginate crosslinked hydrogel electrolyte, its preparation method, and its applications. This application reduces environmental toxicity and pollution by introducing modified sodium alginate as a crosslinking agent into the hydrogel electrolyte. The interaction between sodium alginate and zinc ions inhibits zinc dendrite formation, regulates the interfacial growth between the negative electrode and the electrolyte, and thus extends battery life; it also has a certain inhibitory effect on hydrogen evolution reaction. This application can prepare the modified sodium alginate crosslinked hydrogel electrolyte using a simple free radical polymerization method. Furthermore, compared to conventional aqueous batteries, the hydrogel electrolyte can better control the interfacial growth of the positive and negative electrodes.

The invention relates to a recyclable easily-degradable macromolecular surfactant for cleaning oily sludge and application of the recyclable easily-degradable macromolecular surfactant. The macromolecular surfactant is prepared by taking acrylamide, methacrylic acid long-chain alkyl ester and tertiary amino substituted methacrylate as raw materials through free radical polymerization. The macromolecular surfactant is dissolved in water to prepare a cleaning solution, and oily sludge can be efficiently eluted. CO2 and N2 are sequentially introduced into the oil-containing emulsion after the oil-containing sludge is cleaned, or diluted hydrochloric acid and a diluted alkali aqueous solution are sequentially added, the hydrophilic-hydrophobic property of the macromolecular surfactant is changed through pH regulation and control, separation of the macromolecular surfactant and an oil phase is achieved, petroleum resources are recycled, and recycling of the cleaning solution containing the macromolecular surfactant is achieved. The residual macromolecular surfactant in the cleaned deoiled sludge can be degraded under the action of environmental microorganisms.

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 discloses a super-tough temperature-resistant self-repairing copolymer based on SBS acrylate dynamic synergistic reinforcement and a preparation method thereof, and belongs to the technical field of self-repairing materials in compositions of high-molecular compounds. The copolymer comprises SBS, an acrylate monomer, a dynamic bond functional monomer, an initiator, a cross-linking agent, a nano reinforcing agent and a temperature-resistant modifier, wherein the dynamic bond functional monomer comprises at least one of acryloyloxyethyl disulfide, acrylamide acryloyloxyethyl disulfide or anthracene methyl acrylate. The molecular structure of the dynamic bond functional monomer contains a carbon-carbon double bond and a disulfide bond, in the free radical polymerization reaction initiated by the initiator, the carbon-carbon double bond is opened and is subjected to a copolymerization reaction with an SBS chain segment or an acrylate chain segment, so that the disulfide bond enters the polymer chain segment, the dynamic disulfide bond can be reversibly broken and recombined at high temperature, and the dynamic bond functional monomer is obtained. The high-temperature viscoelasticity is maintained, the material is endowed with self-repairing capability, and the problem that the viscoelasticity of the material in the prior art is sharply reduced at high temperature (gt; 120 DEG C) is solved.

The invention discloses a polymeric dispersant, a preparation method, a pigment paste and a photocuring composition, the polymeric dispersant is characterized in that the polymeric dispersant is a terpolymer formed by controllable free radical polymerization of a structural unit A, a structural unit B and a structural unit C. The structural unit A is derived from alkyl (meth) acrylate; the structural unit B is derived from polyethylene glycol (methyl) acrylate; and the structural unit C is derived from an N-acryloyl carbazole monomer. The polymeric dispersant aims to overcome the defect that the flexibility of the anchoring group connection mode in the existing carbazole dispersant is too large, and the N-acryloyl carbazole monomer with an optimized structure and a ternary polymerization framework are adopted to realize more efficient and lasting anchoring with the pigment surface, so that the flocculation problem is solved, and the super-stable dispersion is realized.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention discloses a waterproof bag film material and a preparation method thereof, relates to the technical field of polybutylene terephthalate polymer materials, and belongs to the patent classification number C08L67 / 02. The method comprises the following steps: sequentially carrying out silane coupling agent modification and solid-phase free radical polymerization on activated gas-phase nano silicon dioxide to construct a core-shell structure nano reinforced filler with rich epoxy groups on the surface; carrying out melt blending extrusion on the mixture, PBT (Polybutylene Terephthalate) resin, a chain extender, an end-capping reagent and the like to obtain hydrolysis-resistant modified granules; a PBT base film is prepared through casting, two-way stretching and heat setting; the preparation method comprises the following steps: performing ultraviolet ozone activation on a base film, coating a super-hydrophobic coating solution prepared from aminated nano silicon dioxide, epoxy-terminated polydimethylsiloxane, a cross-linking agent and an accelerant, and heating and curing to finally obtain the high-strength high-waterproof PBT waterproof bag film. The prepared film has excellent mechanical strength, body hydrolysis resistance and super-hydrophobic surface, the water contact angle is high, the coating adhesive force is high, and the waterproof performance is lasting and stable under high-frequency bending.

The invention discloses a novel phosphorus-containing macromolecular flame retardant and a preparation method and application thereof, the flame retardant is a polymer with a general formula (I), the main chain of the flame retardant is composed of an olefin-containing phosphonate structural unit, and the side chain R2 is a phosphonate group or a phosphonate metal salt group. The preparation method comprises the following steps: firstly, carrying out reaction on trialkyl phosphite and halogenated olefin containing active groups to efficiently prepare a functional monomer containing polymerizable double bonds and phosphonate side chains; then carrying out free radical polymerization to obtain a macromolecular polymer; the phosphonate can be further partially or completely hydrolyzed and complexed with multivalent metal ions to form the flame retardant with an ionic cross-linked structure. The macromolecular flame retardant is high in phosphorus content, good in thermal stability and excellent in compatibility with a polymer matrix, can play a flame-retardant role in a condensed phase and a gas phase at the same time, and effectively overcomes the problems that a micromolecular flame retardant is easy to migrate and poor in durability, and the mechanical property of a matrix material is reduced. The preparation method is efficient, controllable and suitable for continuous production.

The invention relates to the technical field of blood purification materials, in particular to a zirconium-titanium bimetal MOF hollow microsphere adsorbent and a preparation method and application thereof. The adsorbent is based on a Zr / Ti bimetallic node and a phosphonic acid-carboxylic acid mixed ligand, a composite MOF hollow microsphere structure with high stability and high specific surface area is constructed through a solvothermal and polymerization synergistic reaction in a water-in-oil suspension system, a phosphonic acid group and Zr are strongly coordinated to improve the stability of a framework, and the composite MOF hollow microsphere structure has a high specific surface area. The carboxylic acid group keeps the hydrophilicity of the pore channel; meanwhile, a cross-linked network of acrylamide and N, N '-methylene bisacrylamide penetrates through crystal gaps in the balling process, so that the material has excellent mechanical strength and fluid stability; and a sulphobetaine amphoteric polymer brush layer is constructed on the surface of the MOF through endogenous initiation point modification and surface in-situ controllable free radical polymerization technologies, so that protein adsorption and platelet adhesion are effectively inhibited, the blood compatibility is remarkably improved, and meanwhile, the channel accessibility is maintained to promote rapid diffusion and adsorption of bilirubin.

The invention discloses a stationary phase of a novel zwitterionic monomer containing a multi-charge structure as well as a preparation method and application of the stationary phase, and belongs to the technical field of hydrophilic interaction chromatography (HILIC) stationary phases. According to the method, multi-charge zwitterions are used as hydrophilic monomers, the multi-charge structure of the multi-charge zwitterions endows the monomers with higher hydrophilic performance, and the multi-charge zwitterions are immobilized on the surface of a matrix by utilizing an active free radical polymerization method, so that a series of novel super-hydrophilic HILIC stationary phases are finally prepared. The multi-charge zwitterionic monomer adopted by the invention not only has better hydrophilic performance and higher charge density, but also can efficiently, simply and conveniently realize matrix surface grafting and modification. The developed stationary phase is suitable for HILIC column chromatography separation analysis, and the HILIC chromatographic performance can be greatly improved; the method can also be applied to the fields of biological sample pretreatment, material science, marker clinical diagnosis and the like, and has high economic and social values.

The invention relates to the field of sheath materials, and discloses an anti-aging sheath material for an electronic wire and a preparation method thereof, the sheath material comprises low density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer, ethylene propylene diene monomer, a triazine ring derivative, ammonium polyphosphate, modified nano silicon dioxide and an auxiliary agent; according to the triazine ring derivative, N-butyl-2, 2, 6, 6-tetramethyl-4-piperidylamine reacts with cyanuric chloride to prepare a triazine ring monosubstituent, hydrazine hydrochloride is used as a bridging agent to react with the triazine ring monosubstituent, and the triazine ring derivative and piperazine are polymerized to prepare the triazine ring derivative. The modified nano silicon dioxide is prepared by enabling 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride and 4-propenyloxy-2-hydroxybenzophenone to react, and carrying out free radical polymerization on the reaction product on the surface of the nano silicon dioxide. The synergistic effect of mechanical property, thermo-oxidative aging resistance, ultraviolet aging resistance and flame retardant property is realized.

The invention discloses an antistatic flame-retardant fiber and a preparation method thereof, and relates to the technical field of functional textile materials. When the antistatic flame-retardant fiber is prepared, the multi-walled carbon nanotube is carboxylated to prepare the modified multi-walled carbon nanotube; carrying out surface free radical polymerization on the modified multi-walled carbon nanotubes and caprolactam to obtain modified polyamide 6 slices; the modified polyamide 6 is sliced and spun, and modified polyamide 6 fibers are prepared; the preparation method comprises the following steps: respectively reacting phytic acid and 2, 3-epoxypropyl trimethyl ammonium chloride with chitosan to prepare a polyanion / cation modified chitosan solution; the modified polyamide 6 fiber is alternately soaked in two modified chitosan solutions, and is treated by cocamidopropyl betaine to prepare the antistatic flame-retardant fiber. The antistatic flame-retardant fiber prepared by the invention has excellent antistatic property, flame retardance and mechanical strength.

The application discloses a multi-carboxyl copolymer aqueous composition for pulp adding in packaging paperboard, synergism in short-stay pulp of packaging paper and fiber synergism in wet end of bamboo pulp paper, and a preparation and application method thereof, and belongs to the technical field of pulp and paper chemicals and wet end chemical control. The composition contains carboxyl-rich copolymer, and can be selected as high filtration rate homogeneous aqueous solution type, flexible type acid or bamboo pulp low cation density copolymer according to paper types, and is prepared through water phase free radical polymerization. In application, the composition is diluted and then added in a divided mode after a fan pump outlet to a pressure screen inlet or after a cationic polyacrylamide retention agent or in a bamboo pulp system. The method is beneficial to improving fiber combination, drainage stability, first-pass retention rate, white water stability and paper strength, and improving the adaptability of wet end dosing windows of different paper types.

The invention discloses a fluorocarbon grafted siloxane supercritical carbon dioxide thickening agent and a preparation method thereof, and relates to the technical field of carbon dioxide thickening. The method comprises the following steps: firstly, carrying out hydrosilylation reaction on tetramethyl tetravinyl cyclotetrasiloxane, tetramethyl cyclotetrasiloxane and multi-arm unsaturated acrylate to prepare a siloxane intermediate, and then carrying out free radical polymerization on the siloxane intermediate and fluoroacrylate to prepare the thickening agent. According to the prepared supercritical carbon dioxide fracturing fluid thickening agent, the contained carbon dioxide-philic groups can interact with carbon dioxide, so that the dissolving property of the thickening agent in supercritical carbon dioxide is enhanced; the thickening agent contains rich multi-branched siloxane groups, a spatial network structure can be further formed, and the supercritical carbon dioxide is effectively thickened through the synergistic effect of all the components.

The application discloses a kind of for multi-substrate coating fast-curable water-based acrylic modified epoxy resin emulsion and its preparation method, first by itaconic acid, alcohol ether solvent and bisphenol A type epoxy resin synthesis epoxy adduct intermediate product, then with other acrylic monomer free radical polymerization is formed acrylic modified epoxy resin with this intermediate product, finally using additional epoxy emulsifier by phase inversion method is made water-based acrylic modified epoxy resin emulsion.The emulsion prepared in the application has higher glass transition temperature, has faster surface dry and curing speed, can satisfy the fast curing of coating film on various substrate workpieces, workpiece offline stacking resistance requirements;Side chain contains a certain amount of carboxyl and hydroxyl, can give coating excellent adhesion, realize good adhesion on various substrates;Resin structure contains a certain amount of bisphenol A type epoxy resin, and epoxy-amine curing agent is well compatible after curing, and coating is uniform.

The present invention provides a curable composition with excellent thermal expansion resistance when used in prepreg applications, as well as prepregs, resin films, metal-clad laminates, printed circuit boards, semiconductor packages, and a method for adjusting melt viscosity. [Solution] The resin contains at least two compounds that have different structures from the compounds represented by general formula (1), and R is present in the resin. 1 , R 2 and R 3 At least one of them is a vinylbenzyl group, and R present in the resin 1 , R 2 and R 3 A curable composition comprising a resin (A) in which at least one of the members is an arylalkyl group other than a vinylbenzyl group, an azo radical polymerization initiator (B), and an imidazole compound (C).

The invention discloses a preparation method and application of dual-network piezoelectric induction hydrogel with a piezoelectric effect, and the method comprises the following steps: taking ACG and GelMA as base materials, taking MBA as a cross-linking agent, cooperating with a photoinitiator, and carrying out free radical polymerization to form a precursor solution; and adding BTO nanoparticles, mixing, and curing to obtain the hydrogel. According to the hydrogel disclosed by the invention, the mechanical property and the structural stability of the material are remarkably enhanced through a double-network structure, and the defects that traditional hydrogel is prone to excessive deformation and insufficient in mechanical property are overcome; by introducing a functional component with piezoelectric property, the material can generate a stable electric signal under the action of external force, the local electrophysiological environment of a wound surface is improved, cell proliferation, migration and angiogenesis are promoted, and tissue repair is accelerated; the anti-infection function can be further achieved while electrical regulation and control are achieved, the limitation of a single drug loading or passive protection strategy is avoided, drug resistance and toxic and side effect risks are reduced, and the synergistic effect of antibiosis and regeneration is achieved.

This invention provides a polymer solid electrolyte monomer and its preparation method, as well as a secondary battery. The polymer solid electrolyte monomer provided by this invention has the structure shown in Formulas 1-4. The secondary battery provided by this invention introduces the polymer solid electrolyte monomer and a certain functional material solution, both of which are used on the positive electrode side. Simultaneously, an acrylate monomer is introduced on the negative electrode side. After battery assembly, heat treatment is performed to initiate gradient in-situ polymerization of the precursors on both the positive and negative electrode sides. Specifically, cationic polymerization initiates mild polymerization on the positive electrode side, free radical polymerization initiates high polymerization on the negative electrode side, and the two monomers interpenetrate at the separator to complete cross-linking copolymerization, thereby forming a gradient polymerization system with increasing polymerization degree from the positive to the negative electrode. The in-situ solid battery prepared using this method has lower internal resistance and faster Li + This improves the electrochemical performance of the battery by creating a transmission channel.

The present invention belongs to the technical field of hybrid polymers. More specifically, the present invention relates to a specific hybrid polymer. The hybrid polymer is obtained by a radical polymerization method between at least one unsaturated ethylenic monomer and at least one protein. The present invention also relates to the use of the composition in various compositions. The present invention also relates to the use of such compositions in various application fields.

The invention discloses a body temperature responsive wet adhesive as well as a preparation method and application thereof in bone defect repair, and belongs to the technical field of preparation of bone defect repair materials. Carbon-carbon double bonds in methoxyethyl acrylate (MEA), N-isopropylacrylamide (NIP) and acrylic acid (AA) are subjected to a free radical polymerization reaction to generate a polymer chain, and a cross-linking agent containing metal cations is added for cross-linking. The body temperature responsive wet adhesive has a good wet adhesion effect and the ability of improving the stability of bone meal, and can solve the technical problem of bone substitute displacement caused by unstable fixation of a barrier membrane.

The invention discloses an acrylic acid silane ester self-renewal antifouling resin based on cation-pi interaction as well as a preparation method and application of the acrylic acid silane ester self-renewal antifouling resin. Methyl methacrylate, ethyl acrylate, triisopropylsilyl methacrylate, acrylic acid-2-methyl ethyl ester, paeonol methacrylate and acryloyloxyethyl trimethyl ammonium chloride are synthesized through a random free radical polymerization reaction with azodiisobutyronitrile and benzoyl peroxide as initiators. Wherein the methacrylic acid paeonol ester monomer is prepared by carrying out substitution reaction on paeonol and methacryloyl chloride. The anti-fouling agent is anchored on the surface of the coating again through cation-pi interaction, so that the anti-fouling effect is enhanced, and the coating still has good anti-fouling capacity even in a static environment.

The application discloses a waterproof coating for outer wall weather resistance, heat insulation and heat preservation and a preparation method thereof. The waterproof coating comprises the following components in parts by weight: modified acrylate polymer emulsion 27-35 parts, composite filler 35-50 parts, curing system 5-10 parts, film forming aid 4-8 parts, defoaming agent 0.1-0.5 parts, leveling agent 0.3-0.8 parts, mildew-proof agent 0.2-0.6 parts, thickening agent 0.5-1.0 parts and pH regulator 1-5 parts. The modified acrylate polymer emulsion is prepared by pretreating and silanization modifying cardanol, monomer pre-emulsification and free radical polymerization. The waterproof coating provided by the application introduces Si-O-C network and hindered amine free radical capture system to improve weather resistance; fluorine compound-nano silicon dioxide constructs roughness-low surface energy synergistic waterproof interface; acid washing fly ash floating beads, silica aerogel and expanded perlite filler are compounded to form multiple heat conduction scattering paths to realize cross-scale porous filler heat preservation; and the waterproof coating can serve in complex environments such as large temperature difference fluctuation and acid rain.

The invention relates to the technical field of lithium ion batteries, and discloses a disulfide bond dynamic network binder for a silicon-based negative electrode plate, and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out ring opening polymerization on lipoic acid and derivatives thereof, and reacting with a functional monomer containing carbon-carbon double bonds capable of free radical polymerization to obtain a disulfide bond dynamic network binder; the binder containing the disulfide bond dynamic network structure is obtained; the functional monomer is a cross-linking / film-forming monomer or a mixture of the cross-linking / film-forming monomer and a monomer carrying a functional side group; according to the binder disclosed by the invention, reversible network reconstruction is realized through disulfide bond exchange, high binding power and pulverization resistance are considered, continuity of a conductive / ion channel can be maintained, surface resistance of a pole piece is reduced, and cycling stability and rate capability are improved. No additional solvent is added in the whole process, the process is simple, cost is low, and the method is suitable for continuous large-scale production.

The application belongs to the technical field of biomedical materials, and discloses a collagen-based double-network porous hydrogel scaffold capable of recruiting endogenous stem cells and a construction method and application thereof. The scaffold takes collagen II (Col-II) and oxidized methyl acrylated hyaluronic acid (AHAMA) as an organic phase, and is constructed into a physical / chemical double-network structure through Schiff base dynamic crosslinking and ultraviolet light-induced methacryl radical polymerization. An air-in-water emulsion template method is used to form a through-porous structure, and 5' aldehyde-modified nucleic acid aptamer Apt19S is anchored in the scaffold network to achieve specific recruitment of endogenous pluripotent stem cells. The scaffold has excellent mechanical properties, a biomimetic extracellular matrix microenvironment and a targeted stem cell recruitment function, can effectively promote the directional differentiation of stem cells into chondrocytes, avoids the immune rejection and ethical issues caused by exogenous stem cell transplantation, and is suitable for the field of articular cartilage defect repair.

One embodiment of the present invention relates to a method for producing a chloroprene seed polymer composition, the method comprising a first polymerization step and a second polymerization step, the first polymerization step is a step for obtaining a chloroprene polymer by subjecting at least a chloroprene monomer to emulsion radical polymerization. The second polymerization step is a step in which at least a specific monomer (B-1) or (B-2) is subjected to emulsion seed polymerization with the chloroprene polymer in an amount of 3-20 parts by mass per 100 parts by mass of the total of the chloroprene polymer and the monomer (B-1) or (B-2).

The present application relates to the technical field of high pressure polymerization of olefins, and in particular to a method and system for cooling polymerization reaction effluent and a method and system for polymerization reaction. The system comprises: a high pressure pressure-reducing valve for reducing the pressure of effluent from a high pressure radical polymerization reactor to obtain a first stream; a first mixing device for mixing the first stream with a cooling monomer raw material stream to obtain a second stream; and a static mixer in communication with the first mixing device for mixing and cooling the second stream again. The method of mixing and cooling the cooling monomer raw material stream with the stream after the high pressure pressure-reducing valve and then mixing and cooling in the static mixer avoids the generation of temperature hot spots, reduces the risk of ethylene decomposition by inhibiting the generation of temperature hot spots, reduces the content of crystal points in the polymer product, improves the product quality, and has good economic benefits.

Disclosed herein are amine containing copolymer compositions based on free radical and controlled radical polymerization of monomer compositions including an amine-derivatized alpha-methyl styrene (ADAMS) monomer according to structure (I): with k, R, R1, and R2 defined herein with one or more monomers selected from the group consisting of optionally substituted acrylates, methacrylates, acrylamides, methacrylamides, acrylonitriles, methacrylonitriles, vinyl ethers, N-vinyl amides, or combinations thereof. Further disclosed herein are methods of making and methods for using such copolymer compositions.

The invention discloses an anti-cracking pouring fine aggregate concrete slab and a preparation method thereof, and belongs to the technical field of concrete production. The concrete slab comprises the following components: cement, stones, machine-made sand, a mineral admixture, a polycarboxylate superplasticizer, a maleic anhydride-hydroxypropyl acrylate copolymer and polyoxyethylene. Wherein the maleic anhydride-hydroxypropyl acrylate copolymer is prepared through free radical polymerization, a blocking layer is formed by combining cement particles and other components, the effects of dispersion, water retention and shrinkage reduction are achieved, stress is relieved through polyoxyethylene, pores are refined, the cracking problem of a fine aggregate concrete plate is effectively solved, and the crack resistance and strength of the prepared concrete are improved.

The invention relates to a process for preparing a block copolymer, the process comprising: a) adding at least one ethylenically unsaturated hydrophilic monomer and a composition Y to a reactor for polymerization; b) adding at least one ethylenically unsaturated hydrophobic monomer to the reactor for polymerization after the polymerization of step a) to obtain an amphiphilic diblock copolymer; c) adding at least one ethylenically unsaturated hydrophobic monomer to the reactor for polymerization after the polymerization of step b); wherein the composition Y contains: A) at least one halogen molecule or halogenated hydrocarbon optionally substituted by cyano, B) at least one iodide salt, and C) at least one free radical polymerization initiator, wherein the equivalent ratio of the at least one ethylenically unsaturated hydrophobic monomer in step b) to the polymer formed from the at least one ethylenically unsaturated hydrophilic monomer in step a) is in the range of 5 to 60.