CN101708973B - Water-plastic retaining polycarboxylic acid water reducer and method for preparing same - Google Patents
Water-plastic retaining polycarboxylic acid water reducer and method for preparing same Download PDFInfo
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- CN101708973B CN101708973B CN2009102296979A CN200910229697A CN101708973B CN 101708973 B CN101708973 B CN 101708973B CN 2009102296979 A CN2009102296979 A CN 2009102296979A CN 200910229697 A CN200910229697 A CN 200910229697A CN 101708973 B CN101708973 B CN 101708973B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
- C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides water-plastic retaining polycarboxylic acid water reducer and a method for preparing same, belonging to the technical field of the cement dispersant. The water-plastic retaining polycarboxylic acid water reducer is characterized by being prepared in nature through copolymerizing a big water-plastic retaining monomer and a small water-plastic retaining monomer, wherein the big water-plastic retaining monomer is prepared by mixing a big ester monomer with a small ester monomer. Prepared from the big water-plastic retaining monomer, the water-plastic retaining polycarboxylic acid water reducer can well retain the water and the plastic of concrete which is prepared through stirring different cement and different aggregate, and the ubiquitous problems of the segregation due to water bleeding and the quick slump loss are effectively solved. The water is used as solvent for the polymerization reaction, which is good for the industrial production and ensures the safe and environmental-friendly production process.
Description
Technical field
The present invention relates to a kind of cement dispersants, be specifically related to a kind of water-plastic retaining polycarboxylic acid water reducer and preparation method thereof that has.
Background technology
Concrete admixture has obtained application more and more widely in the concrete construction, be called as concrete the 5th component; Its exploitation and application have promoted the development of concrete technology, have become the key material of producing high performance concrete.
The application of Concrete Additive relates to cement, admixture and three industries of concrete, and wherein having become about the adaptability problem of admixture and cement and aggregate is three difficult problems that industry faces jointly.Bleeding segregation and slump-loss that the adaptability problem of admixture and cement and aggregate mainly shows as when mixing the system concrete are fast.
The factor that the bleeding segregation of new mixed concrete and the fast problem of slump-loss relate to cement, concrete and admixture three aspects.Aspect cement, though the leading indicator of domestic cement can both reach the requirement of relevant criterion because the cement type that exists is many, complicated component and with the problems such as adaptation difference of water reducer; Aspect the preparation concrete, adopt some starting material inferior sometimes, as with low-quality sand or artificial sand, What is more with artificial limestone powder grain replacement sand, and everything all can have a strong impact on mixes the flexibility of making concrete and water reducer.And under the condition of complicated at present cement and concrete aggregate, rely on the novel water reducer of synthetic to solve mixing bleeding segregation and the fast adaptability problem of slump-loss of making concrete is a more rational economic technology approach.
Do not see in the existing patented technology report that solves poly carboxylic acid series water reducer of mixing system concrete bleeding segregation and the fast problem of slump-loss and preparation method thereof is arranged.
Summary of the invention
Technical problem to be solved by this invention provides a kind of water-plastic retaining polycarboxylic acid water reducer and preparation method thereof; Protect plastotype BBEG and the synthetic a kind of novel poly carboxylic acid series water reducer of minor comonomer through using water conservation, be intended to solve the bleeding segregation and the fast problem of slump-loss that when mixing the system concrete, exist.
A kind of water-plastic retaining polycarboxylic acid water reducer of the present invention; It is characterized in that processing by water conservation guarantor's big monomer of plastotype and minor comonomer copolymerization; Water conservation is protected the big monomer of plastotype and is represented with BBEG; Mixed by proper proportion by big monomer a of ester class and the big monomer b of ethers, wherein, the big monomer a of ester class representes with general formula (1):
R in the formula
1Be Wasserstoffatoms or methyl, R
2Be that carbonatoms is the alkyl of 1-3, AO is that carbonatoms is the mixture that oxyalkylene group or two this oxyalkylene groups of 2-3 exists with unordered, block or alternatively form, and n is the average addition mole number of oxyalkylene group, is 25-120;
The big monomer b of ethers representes with general formula (2):
R in the formula
3Be that carbonatoms is the alkyl of 1-3, R
4Be that Wasserstoffatoms or carbonatoms are the alkyl of 1-3, BO is that carbonatoms is the mixture that oxyalkylene group or two this oxyalkylene groups of 2-3 exists with unordered, block or alternatively form, and m is the average addition mole number of oxyalkylene group, is 25-120;
The mol ratio of big monomer a of ester class and the big monomer b of ethers is 1: 3-1: 10;
Said minor comonomer is one or more the mixing in vinylformic acid (representing with AA), methylacrylic acid (representing with MAA), N hydroxymethyl acrylamide (NMA) and the Propylene glycol monoacrylate (HPA).
The mol ratio of said BBEG and minor comonomer is 1: 2～1: 5.Be made up of (methyl) vinylformic acid [representing with (M) AA] and N hydroxymethyl acrylamide, Propylene glycol monoacrylate when minor comonomer, wherein the mol ratio of (methyl) vinylformic acid and N hydroxymethyl acrylamide, Propylene glycol monoacrylate is 1～10: 0.1～2: 0.1～3.
Prepare the method for water-plastic retaining polycarboxylic acid water reducer according to the invention, comprise the steps:
1) in reaction kettle, adds earlier entry, BBEG and reductive agent NaHSO
3, slowly heat up;
2) minor comonomer and chain-transferring agent being mixed with mass concentration is that 40～55% solution is expected as A; Mass concentration is that 0.5～1.5% oxidant persulfate or peroxide aqueous solution are expected as B; When end liquid temp reaches 60～100 ℃; Begin simultaneously to wherein dripping A material and B material; A material 2.0-3.0h adds; B material 2.5-4.0h adds, after A material and B material add, and insulation reaction 1～3h;
3) after insulation finishes, reduce to normal temperature, regulate pH to 6～8 with 30wt%NaOH solution, promptly obtain water-plastic retaining polycarboxylic acid water reducer solution, total solid content of final product is 16-23%.
Initiator system that the present invention adopts is oxygenant persulphate or superoxide and reductive agent NaHSO
3The redox system of being formed, wherein the oxygenant consumption is 0.05～5% of a total monomer weight (comprising big monomer and minor comonomer), oxygenant and reductive agent NaHSO
3Weight ratio be 1: 0.1～0.6.
The big monomer b of ethers is owing to the structure that adopts initiator has high reaction activity and high; Make the synthetic water reducer have bigger molecular weight and higher viscosity; The Soxylat A 25-7 side chain that also contains strongly hydrophilic simultaneously in its molecule, thus for improving the water conservation protect plasticity condition can be provided.
BBEG is formed according to certain mixed by big monomer a of ester class and the big monomer b of ethers, and its composition has adjustability.
Because (M) polymerization activity of AA is bigger; For preventing that himself from polymerization taking place; In reaction system, add chain-transfer agent; Chain-transfer agent is selected one or more the mixture in thiohydracrylic acid, Thiovanic acid, mercaptoethanol or the Dodecyl Mercaptan for use, and its consumption is the 0.1-3.0% of BBEG and minor comonomer total amount.
The grafting water conservation is protected big monomer of plastotype and minor comonomer in the molecular backbone chain of water-plastic retaining polycarboxylic acid water reducer; After unsaturated double-bond in the comonomer was opened under action of evocating, polymerization taking place synthetic was main chain and to protect the big monomer of plastotype with water conservation be the pectination polymer organic polymer of graft side chain to gather (M) AA.The reactive behavior that BBEG is high makes the synthetic water reducer have bigger molecular weight and higher viscosity, and the carboxyl that contains in the water reducer molecule simultaneously provides electrostatic repulsion, and the big monomer of the side chain that contains has sterically hindered effect and water-disintegrable.Bigger molecular weight, higher viscosity, electrostatic repulsion, space steric effect and water-disintegrable demonstrates the premium properties that diminishing, water conservation and guarantor are collapsed etc. after making water reducer by cement granules absorption.
Compared with prior art, the present invention has following beneficial effect:
1) BBEG is mixed by big monomer a of ester class and the big monomer b of ethers.Big monomer a hydrolysis under alkaline condition has the stronger slump and keeps performance; Big monomer b has high reaction activity and high because to have adopted carbonatoms be the initiator of vinyl carbinol conduct of the alkyl substituent of 1-3, and product has bigger molecular weight and higher viscosity, makes product have water-retentivity preferably.
2) in the polyreaction, BBEG adopts and joins the feeding method in the reaction kettle in advance, has reduced manipulation strength, has strengthened controllability.Polyreaction adopts water as reaction solvent, has both helped suitability for industrialized production, can guarantee the safety of production process and environmentally friendly again.
3) poly carboxylic acid series water reducer of the present invention concrete that different cement and aggregate are mixed system has water conservation protect plasticity preferably.
Embodiment
Be to simplify statement, below represent that with BBEG water conservation protects the big monomer of plastotype; MAA representes methylacrylic acid; AA representes vinylformic acid; NMA representes N hydroxymethyl acrylamide; HPA representes Propylene glycol monoacrylate; (NH
4)
2S
2O
8The expression ammonium persulphate; NaHSO
3The expression sodium sulfite anhy 96; SA representes thiohydracrylic acid.
Big monomer a, b and c raw material that table 1 polyreaction is used
Embodiment 1
Big monomer (a-1) is 1: 4 with the mol ratio of big monomer (b-1), and BBEG: AA: NMA=1: 2.5: 0.1 (mol ratio), initiator system are (NH
4)
2S
2O
8: NaHSO
3=1: 0.4 (weight ratio), (NH
4)
2S
2O
8Consumption is 0.8% of a monomer total mass, is made into 1.0% the aqueous solution (mass concentration), and the SA consumption is 0.6% of a monomer consumption.。
With BBEG and NaHSO
3Put into Di Shuishui in advance, begin to heat up.It is the A material that AA, NMA, SA and a certain amount of water are made into 55% the aqueous solution, initiator (NH
4)
2S
2O
8Solution is the B material.When end liquid is warming up to 70-85 ℃, begin to add A material and B material with volume pump, A material 2.5h drips off, and B material 3.0h adds.After the A material adds, under this temperature, be incubated 1h, reduce to 40-50 ℃, be neutralized to pH=6～8, promptly obtain the poly carboxylic acid series water reducer product with 30%NaOH.The weight ratio of water and all solids raw material is 8: 2.
Embodiment 2
Big monomer (a-2) is 1: 6 with the mol ratio of big monomer (b-1), BBEG: MAA: NMA=1: 3: 0.3 (mol ratio).Initiator system is (NH
4)
2S
2O
8: NaHSO
3=1: 0.6 (weight ratio), NH4S
2O
8Consumption is 1.2% of a monomer total mass, is made into 1.0% the aqueous solution (mass concentration), and the SA consumption is 0.6% of a monomer consumption.。
With BBEG and NaHSO
3Put into Di Shuishui in advance, begin to heat up.MAA, NMA, SA and a certain amount of water is made into 55% the aqueous solution (mass concentration) as the A material, initiator ammonium persulfate solution is expected as B.When end water rises to 70-85 ℃, begin to add A material and B material with volume pump.A material 2.5h adds, and B material 3.0h adds, and the B material adds the back and under this temperature, is incubated 1h.Be cooled to 40-50 ℃, be neutralized to pH=6～8, promptly obtain the poly carboxylic acid series water reducer product with 30%NaOH.The weight ratio of water and all solids raw material is 8: 2.
Embodiment 3
Big monomer (a-3) is 1: 8 with the mol ratio of big monomer (b-2), BBEG: MAA: AA: NMA=1: 2: 1: 1 (mol ratio).Initiator system is (NH
4)
2S
2O
8: NaHSO
3=1: 0.4 (weight ratio), (NH
4)
2S
2O
8Consumption is 1.5% of a monomer total mass, is made into 1.0% the aqueous solution; The SA consumption is 0.3% of a monomer consumption.
With BBEG and NaHSO
3Put into end water in advance, begin to heat up.MAA, NMA, SA and a certain amount of water is made into 55% the aqueous solution and expects, initiator ammonium persulfate solution is expected as B as A.When end water rises to 70-85 ℃, begin to add A material and B material with volume pump.A material 2.5h adds, and B material 3.0h adds, and the B material adds the back and under this temperature, is incubated 1h.Be cooled to 40-50 ℃, the NaOH with 30% is neutralized to pH=6～8, promptly obtains the poly carboxylic acid series water reducer product.The weight ratio of water and all solids raw material is 8: 2.
Embodiment 4
Big monomer (a-2) is 1: 8 with the mol ratio of big monomer (b-2), mol ratio BBEG: MAA: AA: NMA: HPA=1: 2: 0.8: 0.1: 0.5.Initiator system is (NH
4)
2S
2O
8: NaHSO
3=1: 0.4 (weight ratio), (NH
4)
2S
2O
8Consumption is 1.0% of a monomer total mass, is made into 1.0% the aqueous solution; The SA consumption is 1.0% of a monomer consumption.With BBEG and NaHSO
3Put into end water in advance, begin to heat up.MAA, NMA, SA and a certain amount of water is made into 55% the aqueous solution and expects, with initiator (NH as A
4)
2S
2O
8Solution is expected as B.When bed material rises to 70-85 ℃, begin to add A material and B material with volume pump.A material 2.5h adds, and B material 3.0h adds, and the B material adds the back and under this temperature, is incubated 1h.Be cooled to 40-50 ℃, the NaOH with 30% is neutralized to pH=6～8, promptly obtains the poly carboxylic acid series water reducer product.The weight ratio of water and all solids raw material is 8: 2.
Comparative example 1
Big monomer (a-1), (a-1): MAA=1: 3.5 (mol ratios), initiator are (NH
4)
2S
2O
8, its consumption is 0.75% of a monomer mass, is made into the aqueous solution of mass concentration 1.5%, the SA consumption is 1.3% of a monomer consumption.
Water of a certain amount of end is risen to 90 ℃, and 50% the aqueous solution that (a-1), MAA, SA and certain water gaging are made into is as A material and initiator (NH
4)
2S
2O
8Solution expects as B, begins simultaneously to be added drop-wise in 90 ℃ the end water, and A material 3h drips off, and B material 3.5h drips off.Be incubated 1h again after the B material adds, reduce to normal temperature.PH to 6～8 are regulated with 30%NaOH solution in the back, and the weight ratio of water and all solids raw material is 8: 2, obtain contrast product 1.
Comparative example 2
Big monomer c, big monomer c: AA=1: 3 (mol ratios), initiator are (NH
4)
2S
2O
8, its consumption is 2.0% of a monomer mass, is made into 1.0% the aqueous solution, the SA consumption is 0.3% of a monomer consumption.
Big monomer c is put into end water in advance, begin to heat up.AA, chain-transfer agent and a certain amount of water is made into 60% the aqueous solution and expects initiator (NH as A
4)
2S
2O
8Solution is expected as B.When the bed material temperature reaches 90 ℃, simultaneously to wherein dripping A material and B material.A material 3h drips off, and B material 3.5h drips off, and under this temperature, is incubated 1h again after the B material adds.Reduce to normal temperature, regulate pH to 6～8 with 30%NaOH solution, the weight ratio of water and all solids raw material is 8: 2, obtains contrast product 2.
Implementation result
Select 42.5 silicate cements of domestic three big Cement Group (conch board, scenery with hills and waters board and middle board) for use; Adopt the TP of GB8076-2008; Liquid poly carboxylic acid series water reducer volume is 0.26% (the solid meter of folding), water consumption: should make concrete slump reach the minimum water consumption of (210 ± 10) mm.Folk prescription concrete mix cement: sand: stone=360: 783: 957, test-results is seen table 1.
From table 1, can find out; Water-plastic retaining polycarboxylic acid water reducer and ester class compare with ethers water reducer product have lower bleeding rate than (＜40%) and the slump through the time variable quantity less (＜65mm), explain that the concrete that product is mixed system to conch board, scenery with hills and waters board and three kinds of cement of middle board all has water conservation and protect plasticity ability preferably.
Table 2 poly carboxylic acid series water reducer is to the performance perameter table of different cement
M: bleeding rate ratio, %; The S:1h concrete slump through the time variable quantity, mm.
The above embodiments of the present invention are can not limit the present invention to explanation of the present invention, in implication suitable with claims of the present invention and any change and the combination in the scope, all should think in the scope of claims.
Claims (5)
1. water-plastic retaining polycarboxylic acid water reducer; It is characterized in that processing by water conservation guarantor's big monomer of plastotype and minor comonomer copolymerization; Water conservation is protected the big monomer of plastotype and is represented with BBEG; Mixed by proper proportion by big monomer a of ester class and the big monomer b of ethers, wherein, the big monomer a of ester class representes with general formula (1):
R in the formula
1Be Wasserstoffatoms or methyl, R
2Be that carbonatoms is the alkyl of 1-3, AO is that carbonatoms is the mixture that oxyalkylene group or two this oxyalkylene groups of 2-3 exists with unordered, block or alternatively form, and n is the average addition mole number of oxyalkylene group, is 25-120;
The big monomer b of ethers representes with general formula (2):
R in the formula
3Be that carbonatoms is the alkyl of 1-3, R
4Be that Wasserstoffatoms or carbonatoms are the alkyl of 1-3, BO is that carbonatoms is the mixture that oxyalkylene group or two this oxyalkylene groups of 2-3 exists with unordered, block or alternatively form, and m is the average addition mole number of oxyalkylene group, is 25-120;
The mol ratio of big monomer a of ester class and the big monomer b of ethers is 1: 3-1: 10;
Said minor comonomer is one or more the mixing in vinylformic acid, methylacrylic acid, N hydroxymethyl acrylamide and the Propylene glycol monoacrylate;
The mol ratio of said BBEG and minor comonomer is 1: 2～1: 5;
Said water-plastic retaining polycarboxylic acid water reducer is according to being prepared as follows the method preparation:
1) in reaction kettle, adds earlier entry, BBEG and reductive agent NaHSO
3, slowly heat up;
2) minor comonomer and chain-transferring agent being mixed with mass concentration is that 40～55% solution is expected as A; Mass concentration is that 0.5～1.5% oxidant persulfate or peroxide aqueous solution are expected as B; When end liquid temp reaches 60～100 ℃; Begin simultaneously to wherein dripping A material and B material; A material 2.0-3.0h adds; B material 2.5-4.0h adds, after A material and B material add, and insulation reaction 1～3h;
3) after insulation finishes, reduce to normal temperature, regulate pH to 6～8 with 30wt%NaOH solution, promptly obtain water-plastic retaining polycarboxylic acid water reducer solution, total solid content of final product is 16-23%.
2. water-plastic retaining polycarboxylic acid water reducer according to claim 1; It is characterized in that said minor comonomer is made up of acrylic or methacrylic acid and N hydroxymethyl acrylamide, Propylene glycol monoacrylate, wherein the mol ratio of acrylic or methacrylic acid and N hydroxymethyl acrylamide, Propylene glycol monoacrylate is 1～10: 0.1～2: 0.1～3.
3. water-plastic retaining polycarboxylic acid water reducer according to claim 1; It is characterized in that the big monomer a of said ester class is polyethylene glycol monomethyl ethermethacrylic acid esters, poly glycol monomethyl ether propenoate or poly glycol monomethyl ether propenoate, the big monomer b of ethers is methacrylic polyoxyethylenated alcohol or 2-methyl-butenol Soxylat A 25-7.
4. water-plastic retaining polycarboxylic acid water reducer according to claim 1, the consumption that it is characterized in that oxygenant described in the preparation method are 0.05～5% of BBEG and minor comonomer total monomer weights, oxygenant and reductive agent NaHSO
3Weight ratio be 1: 0.1～1: 0.6.
5. water-plastic retaining polycarboxylic acid water reducer according to claim 1; It is characterized in that the transfer agent of polymeric chain described in the preparation method selects one or more the mixture in thiohydracrylic acid, Thiovanic acid, mercaptoethanol or the Dodecyl Mercaptan for use, its consumption is the 0.1-3.0% of BBEG and minor comonomer gross weight.
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