CN102503227A - Early-strength polycarboxylic acid water reducing agent - Google Patents
Early-strength polycarboxylic acid water reducing agent Download PDFInfo
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Abstract
The invention relates to an early-strength polycarboxylic acid water reducing agent and a preparation method thereof. The early-strength polycarboxylic acid water reducing agent is in a liquid state, and the solid content is 40%. The preparation method comprises the following steps: polymerizing modified polyoxyethylene ether or polyoxypropylene ether, (methyl)acrylic acid or itaconic acid, acrylamide, sodium methyl propenyl sulfonate and other monomers under the actions of a molecular weight chain initiator and a chain transfer agent; and neutralizing to obtain the water reducing agent containing carboxy, amino, sulfonic and polyethenoxy side chains. The early-strength polycarboxylic acid water reducing agent provided by the invention has the advantages of low alkali content and high water reducing rate; and when the early-strength polycarboxylic acid water reducing agent, which accounts for 0.6-1.4 wt of the cementing material, is added to the cementing material, the concrete is labor-saving for operation, and the cement mixture has high flowability and good workability. The early-strength polycarboxylic acid water reducing agent can effectively shorten the setting time and enhance the early strength. The invention has the advantages of simple production technique, easily controlled reaction conditions and no environmental pollution.
Description
Technical field
The invention belongs to a kind of poly-carboxylic high-performance cement water reducing agent and preparation method thereof.
Background technology
Compare with high efficiency water reducing agents such as naphthalene system, trimeric cyanamide system, sulfamates; Polycarboxylate water-reducer has more excellent performance; Outstanding behaviours is that volume is low, water-reducing rate is high, fresh concrete is mobile and slump retaining is good, lowly shrink, strengthen characteristics such as potentiality are big, environmental friendliness, become in recent years and even the direction of Future Development and application.High performance water reducing agent of polyocarboxy acid has become the representative of concrete admixture last word, and its research and application have obtained domestic and international professional and technical personnel and workmen's great attention.China had obtained fast development in the research and the application facet of high performance water reducing agent of polyocarboxy acid in recent years, used also and shifted to civilian civil engineering work gradually from Important Project, and its consumption will constantly increase.But the kind of domestic high performance water reducing agent of polyocarboxy acid is single relatively, and application technical research is also abundant inadequately, still can not satisfy different engineerings and different areas to water reducer variation requirement.Particularly have early powerful polycarboxylate water-reducer product and in concrete prefabricated element and the engineering with particular requirement, have good application prospects, in this respect research at present is also less relatively.
Realize that poly carboxylic acid admixture powerful technological approaches morning has two kinds, a kind of is that synthetic polymer itself has preferably epistasis ability early, and a kind of in addition is synthetic conventional polycarboxylate water-reducer, and it is strong to reach morning through composite accelerating component.At present, domestic basically all through polycarboxylate water-reducer with accelerating component is composite forms.But traditional inorganic salt class hardening accelerator then can have a strong impact on the development of late strength of concrete, and the content of its chloride ion content or alkali is high, is unfavorable for concrete weather resistance.Though the organic hardening accelerator of alcamines is little and do not have cl ions, its addition content to be difficult to control to concrete later stage performance impact, cause the decline of the serious slow setting of concrete and concrete strength easily, and fancy price has also influenced its application in the concrete industry.Vapor cure and microwave curing then are unfavorable for environmental protection, requirements of saving energy.So the high early strength poly-carboxylic water reducer that the method through synthetic polymer makes is the needs in market, also is the needs of industry development.
Abroad the Application Research technology for the high early strength poly-carboxylic water reducer is comparatively ripe; When repairing intercontinental highway Broad dock Road Bridge, just used a kind of morning of strong Portland cement concrete (PCC) as far back as Virginia DOT in 1998, only used 8 hours and just recovered to be open to traffic.Grace company 1998 adopts Acrylic Acid Monomer, contain that polymkeric substance that acid amides or imido systematize compound etc. form through aqueous solution copolymerization and nitrocalcite etc. are compound to have made a kind of water reducer with early strength function.Gondola T.Cerull utilizes methoxy poly (ethylene glycol) and methylacrylic acid and methylacrylic acid polyisocyanate polyaddition, generated weight-average molecular weight greater than 15000 polycarboxylate water-reducer.At 13 ℃ of maintenance 14h, the concrete strength of this water reducer of admixture can reach about 30MPa, and this makes and when producing concrete prefabricated element down for 20 ℃, can reduce even cancel vapor cure.
The superplasticizer (DynamonSP3 powder) of the nanostructure that Italy Ma Bei company report is produced can make shorten the inductive phase of cement spray; This has become the structural form and the stability of early stage hydrated cementitious product; Quicken the setting and harden of sand-cement slurry, improve early strength.The side chain that its typical constructional feature is exactly a polymer molecule is longer, and main chain is shorter relatively.It is thus clear that the method that improves early age strength of concrete through synthetic polycarboxylate water-reducer molecule with long side-chain structure is comparatively general and feasible.
In recent years, the Japan transregional companys such as BASF AG, Degussa that touch coal company, Switzerland west card, Germany had developed in succession also that early epistasis can excellent product.A kind of new polycarboxylate water-reducer had been invented by Sequa Corp in 2007, and it belongs to the both sexes co-poly carboxylic acid, was formed by amidation polyoxyethylene ene compound, vinylformic acid and the salt thereof and the polyethylene glycol acrylate copolymerization that contain alkene.Its performance characteristics is to reduce the concrete viscosity, and is early effective by force, and its dispersive ability increases in time and increases, slump hold facility excellence.
Main brand has the ViscoCrete-20HE series of west card, the GleniumAce388Surete of BASF etc.
Recent years, domestic related personnel also recognizes the necessity of high early strength poly-carboxylic water reducer, and much human has also all begun the research of high early strength poly-carboxylic water reducer.The domestic research that has also begun to prepare the high early strength poly-carboxylic water reducer through the method for organic synthesis.Such as; Ma Cunqian, Liu of Jiangsu Province ltd of division of construction institute and Jiangsu Botexin Materials Co., Ltd add the equality people; Optimizing the comb-shaped copolymer molecular structure and studying on the basis of comb-shaped copolymer molecular structure to cement early hydration performance impact rule; Through modern molecule tailoring technique, develop a kind of ultra high early strength poly-carboxylic water reducer PCA-V.Concrete test is the result show, envrionment temperature is low more, and strong effect morning behind the interpolation PCA-V is obvious more.Under 4 ℃ of low temperature environments, the 24h concrete crushing strength is equivalent to more than 500% of the common PCA-I superplasticizer of admixture concrete crushing strength, and 30h ultimate compression strength is equivalent to mix 480% of PCA-I.
The Guo Xinqi of Fujian KeZhiJie New Materials Co., Ltd and the Yu Feiyu of Xiamen City Building Science Research Institute Group Co., Ltd with the allyl polyglycol of vinylformic acid, acrylic amide, methylpropene sodium sulfonate, different molecular weight in the aqueous solution with free-radical polymerized method, synthesized high performance water reducing agent of polyocarboxy acid and tested the application performance of this water reducer with pectination; The result shows that this water reducer has higher water-reducing rate, can improve concrete early strength by a relatively large margin, the high performance concrete that suitable configuration has early strength to require.
The Sun Zhen equality of key lab of the advanced civil engineering work Board of Education of Tongji University and Jiang Guobao of Shanghai Gujia Chemical Technology Co., Ltd. and Yang Yun etc. adopt water solution polymerization process, and a kind of high early strength poly-carboxylic water reducer PC-A has been synthesized in the big monomer polyethylene glycol monomethyl ethermethacrylic acid esters of homemade esterification (M PEGMA) and methylacrylic acid (MAA), methylpropene sodium sulfonate copolymerization such as (SMAS).Carried out comparative study through test with regard to the fundamental property of PC-A and the effect that is applied in prefabricated common strength grade and the high-strength concrete thereof.The result shows that PC-A has early strong preferably effect, and is suitable for microthermal climate production precast concrete and non-autoclaved curing prestressed high-strength tubular pile concrete.
Though it is correlative study has been carried out comparatively widely, really less relatively through the synthetic producer that makes and produce in batches.The main brand that has in the market (comprising the product that makes through composite): the outstanding person of Fujian section, Jiangsu Bo Te and Beijing Rui Disi.If ability independent research prescription, and reach domestic and international equivalent technology level, bigger competitive edge and market outlook will be arranged.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the present invention provides a kind of high early strength poly-carboxylic water reducer.This high early strength poly-carboxylic water reducer overcomes water reducer complex manufacturing in the past; The shortcoming that time of coagulation is long provides a kind of high early strength poly-carboxylic high-performance cement water reducing agent and preparation method, and this water reducer performance is high and stable; Synthesis technique is simple, easy control of reaction conditions, is easy to suitability for industrialized production.
The present invention adopts following technical proposals to realize: a kind of poly-carboxylic high-performance cement water reducing agent, its molecular weight are that structural formula is:
Wherein M is selected from sodium or ammonium; R is selected from hydrogen or methyl; M, n are the integer of 35-55.
The preparation method of the cement water reducing agent that the said structure formula is represented; In the Soxylat A 25-7 or the polyethenoxy ether aqueous solution, add acrylic or methacrylic acid and acrylic amide, as initiator, Thiovanic acid or thiohydracrylic acid are as chain-transfer agent with ammonium persulphate or Sodium Persulfate; Carry out polyreaction at 60～80 ℃; Described initiator adds at 90～110min, and about altogether 6 ± 0.5h of reaction times is after reaction is accomplished; With sodium hydroxide solution or ethylenediamine solution pH=6～7 that neutralize, obtain 40% polycarboxylate water-reducer solution.
Described polyoxy second (third) alkene ether is 1: 3.0 with (methyl) acrylic acid molar ratio; Acrylic amide: methylpropene sodium sulfonate: (methyl) acrylic acid molar ratio is 1: 1: 5.0; Initiator amount is 1%～6% of a polymerization single polymerization monomer mole number; Chain-transfer agent is 3%～8% of a polymerization single polymerization monomer consumption;
Described initiator amount is 2.5% of a polymerization single polymerization monomer mole number;
Described chain-transfer agent is 4.5% of a polymerization single polymerization monomer consumption;
The synthetic of polycarboxylic acid concrete water reducer of the present invention is to utilize to add acrylic or methacrylic acid and acrylic amide copolymerization in polyoxy second (third) the alkene ether aqueous solution, need not nitrogen protection, and temperature of reaction is constant, and reinforced program is simple, and reaction conditions is easy to control.Adopt the concrete of ROHM series concrete water-reducing agent of the present invention preparation, when this water reducer volume of 30wt% concentration be cement weight 1% the time, the concrete mix slump can reach 19cm; When volume was 1%, water-reducing rate can reach 27%, and concrete 1d ultimate compression strength improves 80～120%; 3d ultimate compression strength improves 70～90%, and obviously shorten time of coagulation, concrete initial set in 30 hours in advance; Final setting time also shifts to an earlier date 0.5 hour moon, and is acted upon by temperature changes hardly; Concrete surface does not have bleeding line, no air pocket, aberration is little, Surface Quality of Concrete good; Alkali content is low; Chloride ion-containing not is to the reinforcing bar non-corrosiveness; Freeze-thaw-ability and anti-carbonization ability significantly improve than normal concrete; Concrete 28d shrinking percentage is that analog high efficiency water reducing agent reduces more than 20% than naphthalene; The adaptation of product is strong, is adapted to the cement of plurality of specifications, model, and product performance are stable, and long storage is not stratified, the nothing deposition, does not have crystallization winter; Advantages such as the product nontoxic pollution-free does not contain formaldehyde, and is environmentally safe.
Embodiment
The proportioning of each reactant is following among the following embodiment; Polyoxy second (third) alkene ether is 1: 3.0 with (methyl) acrylic acid molar ratio; Acrylic amide: methylpropene sodium sulfonate: (methyl) acrylic acid molar ratio is 1: 1: 5.0; Initiator amount is 1%～6% of a polymerization minor comonomer mole number, and optimum amount is 2.5%; Chain-transfer agent is 3%～8% of a polymerization single polymerization monomer consumption, and optimum amount is 4.5%;
Embodiment 1:
Best proportioning
With molecular weight 100.00 parts of Soxylat A 25-7s and 100.00 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 10.80 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+2.13 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 10.00 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 2
With molecular weight 100.00 parts of Soxylat A 25-7s and 94.57 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 7.20 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+2.13 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 10.00 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 3
With molecular weight 100.00 parts of Soxylat A 25-7s and 105.38 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 14.4 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+2.13 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 10.00 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 4
With molecular weight 100.00 parts of Soxylat A 25-7s and 98.05 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 10.80 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+0.85 part of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 10.00 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 5
With molecular weight 100.00 parts of Soxylat A 25-7s and 101.88 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 10.80 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+3.4 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 10.00 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 6
With molecular weight 100.00 parts of Soxylat A 25-7s and 103.33 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 10.80 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+2.13 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 6.67 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
Embodiment 7
With molecular weight 100.00 parts of Soxylat A 25-7s and 92.30 parts of water of 2000; Add in the reaction vessel, heat up, under 80 ± 5 ℃ of temperature; Stirring is dissolved reactant fully; In container, drip the aqueous solution be dissolved with 10.80 parts of vinylformic acid+4.74 part methylpropene sodium sulfonates+2.13 parts of acrylic amide+40 part water and 5% ammonium persulfate solution 24.00 and mass percent again and be 17.8 parts of 10% thin basic ethanolic solns, control rate of addition, dripped off at 100 ± 10 minutes; Maintain the temperature at 80 ± 5 ℃, continue reaction 4 hours.Add about 2.53 part of 40% sodium hydroxide solution after the cooling again and regulate PH=6.5 ± 0.5, obtain poly-carboxylic high-performance cement water reducing agent of the present invention.
The above-mentioned high early strength poly-carboxylic water reducer that the present invention provides, example detection result is following:
Clean slurry degree of mobilization test (GB/T8077-2000): adopt reference cement, according to GB/T8077-87 test cement paste degree of mobilization.The result sees table 1.
Table 1
Cement mortar strength detected result such as table 2
Claims (8)
1. a high early strength poly-carboxylic water reducer is characterized in that comprising following compound, and the molecular weight of said compound is 10000～50000, and structural formula is following:
Wherein M is selected from sodium or ammonium:
R is selected from hydrogen or methyl;
M, n are the integer of 35-55.
2. the preparation method of polycarboxylate water-reducer according to claim 1; It comprises the steps: in the Soxylat A 25-7 or the polyethenoxy ether aqueous solution, to add acrylic or methacrylic acid and acrylic amide; As initiator, Thiovanic acid or thiohydracrylic acid carry out polyreaction as chain-transfer agent at 60～80 ℃ with ammonium persulphate or Sodium Persulfate; Described initiator added at 90～110 minutes; After reaction is accomplished,, obtain 40% polycarboxylate water-reducer solution with sodium hydroxide solution or ethylenediamine solution pH=6～7 that neutralize.
3. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: polyoxy second (third) alkene ether is 1: 2.0～4.0 with (methyl) acrylic acid molar ratio; Acrylic amide: methylpropene sodium sulfonate: (methyl) acrylic acid molar ratio is 1: 1: 2.0～8.0; Initiator amount is 1%～6% of a polymerization single polymerization monomer mole number; Chain-transfer agent is 3%～8% of a polymerization single polymerization monomer mol ratio consumption.
4. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: polyoxy second (third) alkene ether is 1: 3.0 with (methyl) acrylic acid molar ratio.
5. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: acrylic amide: methylpropene sodium sulfonate: (methyl) acrylic acid molar ratio is 1: 1: 5.0.
6. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: initiator amount is 2.5% of a polymerization single polymerization monomer mole number; Chain-transfer agent is 3%～8% of a polymerization single polymerization monomer consumption.
7. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: chain-transfer agent is 4.5% of a polymerization single polymerization monomer consumption.
8. the preparation method of high early strength poly-carboxylic water reducer according to claim 2 is characterized in that: polymerization reaction time is 6 ± 0.5 hours.
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| CN102731009A (en) * | 2012-06-21 | 2012-10-17 | 马清浩 | Sulfo group-containing polyester carboxylic acid water reducer and its preparation method |
| CN102875051A (en) * | 2012-10-25 | 2013-01-16 | 山东省建筑科学研究院 | Polycarboxylate superplasticizer for effectively resisting adverse influence from clay and preparation method of polycarboxylate superplasticizer |
| CN102952243A (en) * | 2012-11-01 | 2013-03-06 | 重庆健杰科技有限公司 | Poly carboxylic acid water reducing agent adopting tartaric acid as chain transfer agent, and preparation method thereof |
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| CN103159900A (en) * | 2013-02-26 | 2013-06-19 | 东莞市伍山建材实业有限公司 | Preparation method for early strength polycarboxylate superplasticizer |
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