297 results about "Sodium methallyl sulfonate" patented technology

The invention relates to a sustained-release polycarboxylic high-performance water reducing agent and a preparation method thereof. The water reducing agent comprises: 0.13mol of monomer methyl alkenyl polyoxyethelene or allyl polyoxyethylene ether or polyoxypropylene ether, 0.32mol of monomer acrylic acid or methacrylic acid, 0.01mol of monomer sodium methallyl sulfonate, 0.12mol of monomer acrylamide or 2-acrylamide-methylpropanesulfonic acid, and 0.05mol of monomer ethyl acetate or styrene. Deionized water is adopted as a reaction medium, and the materials are subjected to a reaction with an initiating agent and a chain transfer agent for 4-6h with a maintained temperature of 58-62 DEG C. Copolymerization is carried out, such that a polymer with a molecular weight of 50000-120000 is obtained; the temperature is reduced to below 40 DEG C, and an alkali solution is added for regulating the pH of the system to 6-8, such that the water reducing agent is obtained. The sustained-release polycarboxylic high-performance water reducing agent provided by the invention has high water reduction rate. When an equivalent solid dosage is 0.2%, a water reduction rate can reach 35%. A slump performance is good. Concrete slump and extension degree have no loss in 3h. The water reducing agent is widely adaptable with concrete raw materials.

The invention discloses a method for preparing a poly carboxylic acid water reducing agent. According to the method, sodium methallyl sulfonate, allyl polyethylene glycols, methacrylic acid, diethylene glycol dimethyl monobutyl ether maleic monoester and water are mixed according to an appropriate proportion and are subjected to thermostatic reaction for 3-7 hours under the temperature of 50-100 DEG C under the initiation of the initiator ammonium persulfate, the reaction products are cooled and then the pH value is adjusted to 6-8 by using a NaOH solution to obtain the water solution of macromolecule copolymer, i.e. the shrinkage-reducing poly carboxylic acid water reducing agent. The invention further discloses a novel shrinkage-reducing poly carboxylic acid water reducing agent. The raw materials of the shrinkage-reducing poly carboxylic acid water reducing agent of the invention are abundant in source, and the synthesis process is simple and easily operated; the shrinkage-reducing poly carboxylic acid water reducing agent has good water reducing and shrinkage reducing functions when the mixing amount is lower, can appropriately entrain air, and has better market prospect and economic benefit.

The invention discloses a mud-resistant polycarboxylic acid water reducer which is prepared from the following components: allyl polyoxyethylene polyoxypropylene ether, components R, R1 and R2, a chain transfer agent, an initiating agent R3 and water, wherein the component R is one or more of maleic anhydride, sodium methallyl sulfonate, vinyl acetate, itaconic acid, itaconic anhydride and fumaric acid; R1 is one or a mixture of two of acrylic acid and methylacrylic acid; R2 is one or more of ascorbic acid, sodium formaldehyde sulfoxylate, ferrous sulfate, tin sulfate, sodium hypophosphite, sodium hydrogen sulfite and oxalic acid. The invention further discloses a preparation method for the mud-resistant polycarboxylic acid water reducer. The mud-resistant polycarboxylic acid water reducer has the following benefits: the water solubility and the steric hindrance of polycarboxylic acid are effectively kept; a large amount of non-hydrophilic structures on branch chains can be used for effectively preventing soil interlayer adsorption, so that the adsorption speed and effect are greatly reduced and the mud-resistant purpose is achieved.

The invention discloses a high-adaptability and high-performance polycarboxylic water-reducing agent, which is obtained by polymerizing a monomer a (methyl allyl polyethenoxy ether or methyl butyl polyethenoxy ether), a monomer b (acrylic acid) and a monomer c (one or a mixture of more than two of maleic anhydride, methacrylic acid, sodium methallyl sulfonate and the like) in an aqueous solution system under the action of an initiator. The prepared high-performance polycarboxylic water-reducing agent has high adaptability with cement, and also has higher adaptability with concrete aggregate, particularly concrete prepared from manufactured sand; compared with an ordinary polycarboxylic water-reducing agent, the prepared polycarboxylic water-reducing agent has the advantages that the slump flow of concrete is higher under the condition that the slump of the concrete is kept the same, and the concrete can freely flow more favorably.

The invention discloses a polycarboxylate water reducing agent for a gobi desert environment. The polycarboxylate water reducing agent is mainly prepared by the following steps of: synthesizing poly(ethylene glycol methyl ether) maleic anhydride active macromonomer (PAM) by performing esterification reaction on poly(ethylene glycol methyl ether) (MPEG) and maleic anhydride (MAH) which serve as main raw materials; preparing a terpolymer by copolymerization of the PAM, sodium methallyl sulfonate (MAS) and itaconic acid (ITA) which serve as raw materials by free radicals; and neutralizing the terpolymer with a base solution. The polycarboxylate water reducing agent has excellent performance, such as high water reducing ratio, little cement paste gradual loss, high cost performance and the like, so that the problem that monomer with large activity difference is difficult to control is solved, and the requirement of construction in the gobi desert environment can be met.

The invention discloses polycarboxylic acid-alcohol amine polymer grinding aid and a preparation method thereof, which relates to cement grinding aid. The general formula of the polycarboxylic acid-alcohol amine polymer grinding aid is RCOONH(CH2CH2OH)3. The raw materials comprise methacrylic acid, polyethylene glycol monomethyl ether, sodium methallyl sulfonate and triethanolamine at a molar ratio of 3.0-4.0:1.0:1.0:1.0-1.5; and the preparation method comprises the following steps: 1, adding diluted aqueous solution of methacrylic acid and polyethylene glycol monomethyl ether in a reaction kettle, heating and stirring; 2, when the temperature is increased to 40 to 60 DEG C, adding the aqueous solution of polymerization inhibitor, continuing heating and stirring, keeping the temperature at 70 to 80 DEG C and reacting for 1 to 2h; 3, keeping the temperature at 70 to 80 DEG C, adding the aqueous solution of sodium methallyl sulfonate and dripping the aqueous solution of initiator; 4, adding the aqueous solution of triethanolamine, keeping the temperature at 70 to 80 DEG C and reacting for 3 to 4h; and 5, cooling the mixture to 40 to 60 DEG C and neutralizing with strong base so as to cause a pH value to be 6.5 to 7.5. The polycarboxylic acid-alcohol amine polymer grinding aid of the invention has the advantages of improving the early and later strength of the grinding aid and the cement due to the synergistic effect of various functional groups.

The invention discloses a room-temperature preparation method of an early strength type polycarboxylate superplasticizer. The early strength type polycarboxylate superplasticizer is prepared from three water soluble monomers including 80wt%-90wt% of methyl allyl polyethenoxy ether, 6wt%-13wt% of acrylic acid and 4wt%-7wt% of acrylamide, sodium methallyl sulfonate is preferably taken as a chain transfer agent, the monomers are copolymerized by a hydrogen peroxide-vitamin C redox initiation system with a single-tank segmented dripping method at the room temperature, and the early strength type polycarboxylate superplasticizer is prepared. The early strength type polycarboxylate superplasticizer is produced with a room-temperature one-step method, the production technology is simple, requirements for production equipment are low, and the method is suitable for production of zero-heat-source early strength type polycarboxylate superplasticizers. The early strength type polycarboxylate superplasticizer prepared with the method has high water reducing rate and good early strength effect and is suitable for production of concrete for metro segments, other prefabricated parts and the like requiring for the early strength performance.

The invention relates to an early-strength polycarboxylate type high-performance water reducing agent and a preparation method. The early-strength polycarboxylate type high-performance water reducing agent is prepared from methyl allyl polyethenoxy ether, acrylic acid, maleic anhydride, 2-acrylamide-2-methyl propane sulfonic acid, sodium methallyl sulfonate, hydrogen peroxide, ammonium persulfate, L-ascorbic acid, dihydrate sodium formaldehyde sulfoxylate, mercaptoacetic acid, mercaptopropionic acid, sodium hydroxide and water. The newly-stirred concrete added with the water reducing agent has good workability; the water reducing rate can reach 30 percent or more; the 1d pressure-resistant intensity of the concrete can reach 185 percent to 198 percent; the 3d pressure-resistant intensity ratio can reach 176 percent to 187 percent; the concrete setting time is obviously shortened; the early strength of the concrete can be obviously improved; the rustiness effect on steel bars does not exist; no alkali-aggregate reaction occurs; a series of advantages such as concrete structure durability are practically guaranteed; the market prospects are wide. The product is widely applicable to various stages of commodity concrete and high-quality concrete for high-speed railways, high-speed highways, large-scale bridges, prefabricated components, airports, port buildings and the like, and is particularly suitable for being used for various concrete engineering constructions with the early strength requirements and concrete construction in low-temperature environment.

The invention discloses a water-soluble temporary plugging agent for temporary blocking diversion in well fracturing. The temporary plugging agent comprises unsaturated organic acid, sodium methallylsulfonate, N-vinylpyrrolidone, polyoxyethylene acrylate, an initiator, sodium hydroxide, a nano-modifier and distilled water. A preparation method of the temporary plugging agent comprises the following steps: adding distilled water into a reaction container, and introducing nitrogen to replace air; adding the unsaturated organic acid, sodium methallyl sulfonate and N-vinylpyrrolidone into the reaction container, stirring the added substances, adding 1 / 2 of the initiator, heating the obtained mixture to 100-110 DEG C, performing a reaction for 30 min, and adding sodium hydroxide; and heating the obtained reaction solution to 145-155 DEG C, performing a reaction for 1.0 h, adding the polyoxyethylene acrylate and the remaining initiator, heating the reaction solution to 175-185 DEG C, addingthe remaining initiator, performing a reaction for 2 h, adding the modifier, and drying the obtained reaction product to obtain the product. The temporary plugging agent has a good temporary blockingdiversion effect, has small damages to stratum after being degraded, passes compressive experiments, and has a compressive strength reaching 80 MPa or more.

The invention relates to a method for preparing a silane polycarboxylate water-reducing agent, relates to a water-reducing agent in a concrete admixture and belongs to the technical field of building materials. The silane polycarboxylate water-reducing agent is prepared from polyoxyethylene ether macromonomer, sodium acrylate or a derivative monomer thereof, chain transfer agents, initiators, a silane functional monomer, 2-acryloyl amino-2-methyl-1-propane sulfonic acid and deionized water. The chain transfer agents are thioglycolic acid, mercaptopropionic acid, sodium methallyl sulfonate and sodium allylsulfonate. The initiators are sodium persulfate and ammonium persulfate. Silane monomer maleic anhydride and triethoxy silane propylamine are prepared through amidation. The silane polycarboxylate water-reducing agent is novel in molecular structure design, high in sulfate resistance and good in concrete material adaptability. The product has an obvious sulfate resistance effect while having a high performance water-reducing effect.

The invention relates to a preparation method of collapse prevention type polycarboxylic acid water reducing agent. The method comprises the following specific steps: methyl allyl polyoxyethylene ether, styrene, sodium methallyl sulfonate and de-ionized water are put in a reaction kettle and evenly stirred for gradually heating to the temperature of 50-70 DEG C, then are gradually dripped with acrylic acid, hydroxyethyl acrylate, oxidizing agent, reducing agent and chain transfer agent; the whole dripping process lasts about 3-4 h; then the heat preservation and the curing are implemented for 1-2 h; finally, the temperature is decreased to 30-35 DEG C; the pH of the solution is adjusted to the neutral property; a proper amount of de-ionized water is added to obtain the colorless transparent collapse prevention type polycarboxylic acid water reducing agent. The used reaction equipment is simple; the reaction is easily controlled; the production cost is low; the water reducing rate is higher; the collapse prevention performance is excellent.

The invention discloses a polycarboxylate water reducing agent, which is a water reducing agent containing side chains of carboxy, sulfo and polyoxyethylene and prepared from monomers such as allyl polyether, acrylic acid and / or derivatives thereof, sodium methallyl sulfonate and aliphatic mercapto acid through polymerization reaction of free radicals and neutralization under an H2O2-Vc oxidation-reduction initiating system. The polycarboxylate water reducing agent is low in alkali content, high in water reducing rate and labor-saving in concrete operation; a cement mixture has high flowability, high slump loss resistance and good workability; and the polycarboxylate water reducing agent serving as an important component of high-performance concrete can be widely applied to premixed and cast-in-place concrete of various industrial and civil buildings, and particularly, has excellent performance in high-strength concrete.

The invention discloses a early-strength poly carboxylic acid system water reducing agent which is formed by the aqueous solution copolymerization of 5-10 percent of crylic acid or methacrylic acid, 35-50 percent of macrogol monoether acrylic monomers with two different chain numbers, 3-7 percent of sodium allylsulfonate or sodium methallyl sulfonate and 1-3 percent of polyether acrylic monomers with defoaming function. The early-strength poly carboxylic acid system water reducing agent has outstanding dispersion property and higher water-reducing property, and especially has obvious early-strength effect, the 1d compressive strength can reach 59.1 percent of the design strength, the gain in middle and later strength is stable, the form cycling rate is increased, and the construction progress is improved. Besides, the preparing process of the early-strength poly carboxylic acid system water reducing agent needs not to adopt the dripping manner, and the batch of all monomers is put into a reaction kettle for one-step reaction. The invention has the advantages of simple operation, short production period, low cost, and the like, and is applicable to the industrial scale production.

The invention relates to the technical field of construction material additives, in particular to a modified polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: conducting condensation reaction on calcium lignosulphonate and acrylic acid to prepare modified calcium lignosulphonate; utilizing monomer methyl allyl polyoxyethylene ether, the modified calcium lignosulphonate and acrylic acid to prepare the modified polycarboxylate superplasticizer through free radical copolymerization synthesis under the action of chain transfer agent sodium methallyl sulfonate and initiator ammonium persulfate. According to the invention, the sulfonic acid group in the introduced calcium lignosulphonate has high dispersity; water-reducing rate is improved; manufacturing cost is reduced; the polycarboxylate superplasticizer is environment-friendly and economic; the preparation technology is simple; the synthesized modified polycarboxylate superplasticizer is high in water-reducing rate, fluidity and slump maintaining capability.

The invention discloses a reduced shrinkage early strength polycarboxylic acid water reducing agent mother liquid and a preparation process thereof. The water reducing agent mother liquid is preparedby the free radical copolymerization reaction of a polyether macro-monomer, an anionic active monomer, a cationic active monomer, a shrinkage reducing monomer, a chain transfer agent and an initiator;wherein the polyether macro-monomer is isopentenyl polyoxyethylene ether and / or methyl allyl polyoxyethylene ether; the anionic active monomer is acrylic acid; the cationic active monomer is methacrylatoethyl trimethyl ammonium chloride; the shrinkage reducing monomer is an esterification reaction product of a phenyl alcohol or a methyl phenyl alcohol with acrylic acid; the chain transfer agent is 2-methyl-2-propene-1-sulfonic acid sodium salt; and the initiator comprises an initiator system A and an initiator system B, the initiator system A comprises organic hydrogen peroxide and vitamin C,and the initiator system B comprises sodium bisulfite and a ferrous salt. According to the preparation process, different functional monomers are grafted to the high-performance polycarboxylic acid water reducing agent, and the length of the main chain is adjusted, so that the polycarboxylic acid water reducing agent has excellent water reducing rate, and also has early strength and reduced shrinkage.

The invention discloses a silane modified polycarboxylate-type water reducing agent as well as a preparation method and a use method thereof. The silane modified polycarboxylate-type water reducing agent comprises the following raw material components in parts by weight: 100 parts of methyl alkene butyl polyoxyethylene ether DD-524, 6-10 parts of fumaric acid, 1-5 parts of vinyl phosphate, 1-2.5 parts of vinyl dimethoxy silane, 1-2.5 parts of vinyl ethyoxyl silane, 2-3 parts of vinyl methyl dimethyl oxo silane, 1-1.5 parts of hydrogen peroxide, 0.5-1 part of sodium formaldehyde sulphoxylate, 0-0.2 part of trisodium phosphate, 0.2-0.8 part of sodium methallyl sulfonate, 1-3 parts of sodium hydroxide and 120-180 parts of water. The silane modified polycarboxylate-type water reducing agent is simple in preparation method, convenient to operate, high in water reduction rate and relatively good in collapse prevention, and the adaptability problem of cement is solved.

The invention discloses a soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The soft-outside and rigid-inside oil-based drilling fluid nano blocking agent is mainly prepared from graphene oxide, a benzene ring-containing monomer, olefin containing carbon-carbon double bonds and sodium methallyl sulfonate as main materials by adopting a continuous emulsion polymerization method; the soft-outside and rigid-inside oil-based drilling fluid nano blocking agent has a plurality of benzene rings and sulfonic acid functional groups, and has good temperature resistance and salt resistance. The synthetic raw materials of the blocking agent are easy to obtain, and the synthetic method is simple and reliable. The particle size of the synthesized soft-outside and rigid-inside oil-based drilling fluid nano blocking agent is 120-330 nm, and nano-sized apertures in a mud shale well wall can be effectively blocked by the synthesized soft-outside and rigid-inside oil-based drilling fluid nano blocking agent. The nano blocking agent can be directly added into the oil-based drilling fluid, is good in compatibility, can effectively prevent the drilling fluid from permeating into a stratum, further stabilizes a well wall and prevents collapse, and has good blocking and filtrate reduction effects.

The invention discloses a water reducing agent with a concrete workability adjusting function. The water reducing agent is prepared from the following components: a. isopentenol polyoxyethylene ether, b. acrylic acid or methylacrylic acid or a mixture of the acrylic acid and the methylacrylic, c. maleic anhydride, d. sodium p-styrenesulfonate, e. ammonium persulfate or potassium persulfate or a mixture of the ammonium persulfate and the potassium persulfate, and f. sodium methallyl sulfonate, wherein the molar ratio of the using amount of a to b to c to d to f is 1:(1-1.5):(1.5-2.5):(0.2-0.25):(0.3-0.6); the using amount of e is 0.5 to 1.0 percent of the total weight of a, b and c. The water reducing agent provided by the invention has water retention capacity and has the function of reducing the surface tension of concrete so as not to influence the viscosity and the flowability of the concrete, and also can guarantee normal condensation and strength development of the concrete.

The invention relates to a universal polycarboxylic acid water reducing agent and a preparation method thereof. The universal polycarboxylic acid water reducing agent is of a liquid state and has the solid content of 40%. The universal polycarboxylic acid water reducing agent is the water reducing agent which is prepared from monomers such as allyl polyether, and maleic anhydride, (meth)acrylic acid or itaconic acid, methyl acrylate and sodium methallyl sulfonate through polymerization under the effects of a molecular weight chain initiator and a chain transfer agent and neutralization; and the water reducing agent contains carboxyl, sulfonic group and an allyl polyether side chain. The universal polycarboxylic acid water reducing agent disclosed by the invention is low in alkali content, high in water-reducing rate, labor-saving in concrete operation, simple in production process, easy in reaction condition control and free of environmental pollution; the cement mixture has high mobility and slump keeping property, and good peaceability; and the universal polycarboxylic acid water reducing agent disclosed by the invention can be used as an important component of high-performance concrete, and can be widely applied to stirred and cast-in-place concrete and ready-mixed concrete for various industrial and civil buildings.

The present invention relates to a latex for dip molding, a composition for dip molding, a preparation method of a dip molded product, and a dip molded product prepared thereby. The latex for dip molding comprises a conjugated diene monomer, an ethylenically unsaturated nitrile monomer, and an ethylenically unsaturated acid monomer, and the latex for dip molding further comprises sodium methallyl sulfonate as a copolymerizable ionic monomer. A dip molded product having excellent tensile strength, elongation and touch can be obtained from the composition using the latex of the present invention, and problems such as ununiformity of physical properties, difficulties in product maintenance, and the like do not occur.

The invention discloses a polycarboxylic cationic anti-mud agent, and a preparation method and application thereof, belonging to the technical field of concrete additives. According to the invention, hydroxypropyl methacrylate with poor hydrophilicity is employed to replace side-chain monomer with good hydrophilicity for synthesis of monomer with a part of cationic charges; and acrylic acid and sodium methallyl sulfonate are used as anionic adsorption monomers for synthesis of a micromolecular polymer through free radical polymerization. Experimental results show that under the condition of same mud content of aggregates, a polycarboxylate superplasticizer with the anti-mud agent has obviously improved dispersion effect, improves the initial fluidity of concrete, reduces slump loss, enables the compressive strength of concrete to be increased by 1.5 to 3 MPa, exerts good inhibitory effect on mud content and is suitable for industrial large-scale production.

The invention discloses a multifunctional high-temperature environmentally-friendly levelling agent. The multifunctional high-temperature environmentally-friendly levelling agent is prepared from, by weight, 20-30 parts of polyethylene glycol mono stearate, 1-3 parts of amino-terminated double-head-sealing agent organic silicone, 5-10 parts of calcium lignosulphonate, 6-8 parts of ethylene glycol double succinic acid octyl alcohol ester sulfonate, 1.5-3 parts of hydroxypropyl methyl cellulose, 1-1.5 parts of hydrophilic gas phase white carbon black, 10-15 parts of sodium gluconate, 4-8 parts of sodium methallyl sulfonate, 2-5 parts of epoxymethacrylate, 0.2-0.5 part of a dispersing agent and 30-40 parts of deionized water. The invention further discloses a preparation method of the multifunctional high-temperature environmentally-friendly levelling agent, the multifunctional high-temperature environmentally-friendly levelling agent has excellent dyeing retarding, dyeing transfer and dispersing performance and is applicable to the dyeing process under multiple situations, so that a dyed object is pure in coloured light and soft in hand feeling, the tinctorial yield is not affected, raw materials such as styrenated phenol and phenol which are not environmentally friendly are not contained, and no harm is caused to the environment.

The invention relates to a polyurethane modified polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: pouring a component A into polyurethane prepolymer at normal temperature, dropwise adding components B and C, and cooling to room temperature after dropwise addition is finished, adjusting the pH value to obtain the polycarboxylate superplasticizer, wherein the component A is prepared by mixing and stirring polyoxyethylene ether, polyethylene glycol and water and then adding a tin or acid catalyst and hydrogen peroxide; the component B is obtained by mixing acrylic acid, a reducing agent and water, and the component C is obtained by mixing sodium methallyl sulfonate, an initiator and water. The water reducer provided by the invention has the branch structure having a plurality of arms and long enough arm lengths, the steric hindrance effect can be brought into full play, the water reducing performance is excellent and the concrete working performance is improved; the method disclosed by the invention is mild in reaction condition, simple in process, less in side reactions, safe, environment-friendly, and low in energy-consuming and production cost.

The invention relates to a demulsifying agent as well as a preparation method and an application of the demulsifying agent. The preparation method comprises the steps: (1) in the presence of an interesterification catalyst and a polymerization inhibitor, carrying out interesterification on a polyether raw material and methyl ester of unsaturated carboxylic acid and / or ethyl ester of unsaturated carboxylic acid; (2) separating methanol and / or ethanol by virtue of reduced pressure distillation; and (3) mixing with the unsaturated carboxylic acid, 2-acrylamide-2-sodium methallyl sulfonate, water and a free radical polymerization initiating agent to perform free radical polymerization. The demulsifying agent prepared by using the method is particularly suitable for demulsification and dehydration of high asphaltene thickened oil.

The invention discloses an anti-sludge concrete water reducer and a preparation method thereof. Particularly, the water reducer provided by the invention is prepared by the following processes: adding the raw materials, namely metallyl alcohol polyoxyethylene ether, acryloyloxyethyl trimethyl ammonium chloride and sodium methallyl sulfonate to a reaction kettle according to a certain proportion, heating up after evenly stirring and mixing; then dripping the prepared crylic acid solution and initiator to the reaction kettle; neutralizing a reactant by using caustic soda liquid until the pH value is 6-7 after reaction is finished; finally, preparing the water reducer. The water reducer provided by the invention is good in performance, and strong in mud resistance, and meanwhile, the anti-sludge concrete water reducer is simple in technology, less in pollution, low in cost, and high in cost performance.

A device for culturing, storing and expanding adherent renal cells. The device permits the adhesion and proliferation of the cells and the surface characteristics of the membrane material used in said device further permit the cellular matrix components (EMC). A method for expanding adherent renal cells and methods of using particular membranes for culturing, storing and expanding adherent renal cells. The membranes comprise a copolymer of acrylonitrile and sodium methallyl sulfonate as well as polyethylenimine.

The invention particularly relates to a preparation method for a slump retaining agent for a polycarboxylate superplasticizer. The preparation method comprises the following steps: (1) mixing and uniformly stirring maleic anhydride, methyl alcohol and p-toluenesulfonic acid, raising the temperature, stirring at constant temperature, and cooling to room temperature to obtain HMA; (2) mixing and uniformly stirring a polyether macromonomer, the HMA, sodium methallyl sulfonate and deionized water to prepare a solution, adding an oxidizing agent, stirring, adding a reducing agent and a chain transfer agent, continuous stirring, and adding an appropriate amount of deionized water to obtain an inter-polymer slump retaining agent. The preparation method has the main advantages that 1, the concrete workability is remarkably improved, the wrapping property is improved, the pumpability is improved, and the slump loss of concrete is remarkably reduced; 2, the slump retaining agent is decomposable in a cement-hydrated alkaline environment, and carboxyl is released, so that the adsorption capacity is improved, and the aim of improving the dispersing capacity of a copolymer is achieved; 3, feeding is carried out at a time by using a one-step method, the dropwise adding process is eliminated, heating is not needed, and the reaction period is short.

The invention discloses a preparation method of tannin-based adsorbent resin. The method comprises the following steps: (1) synthesis of a copolymer: by taking potassium peroxydisulfate as an initiator, reacting sodium methallyl sulfonate with acrolein to obtain the copolymer; and (2) synthesis of the tannin-based adsorbent resin: carrying out phenolic aldehyde condensation reaction between an aldehyde group in the copolymer and a phenol ring in the tannin molecular structure to prepare the tannin-based adsorbent resin in a crosslinking manner, and introducing a sulfonic acid group to the tannin molecular structure to improve the adsorptive property. The invention provides the novel preparation method of the tannin-based adsorbent resin, and has the characteristics of few reaction steps, simplicity in operation and low cost. The obtained tannin-based adsorbent resin is strong in adsorption capacity, insoluble in water and reproducible, has a strong adsorption capacity to lead ions, and can be used for wastewater treatment.