CN104479066B - A kind of concrete viscosity conditioning agent and preparation method thereof - Google Patents
A kind of concrete viscosity conditioning agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of concrete viscosity conditioning agent and preparation method thereof, the viscosity modifier is obtained by cationic monomer, anionic carboxyl monomer and internal crosslinker by free-radical polymerized, and cationic monomer, anionic carboxyl monomer, the mol ratio of internal crosslinker are 1：(0.5~5)：(0.01~0.1).The present invention obtains amphiphilic polymers using cationic monomer, anionic carboxyl monomer copolymerization, has obvious anti-poly- electric matter property, shows preferable thickening property；Adding internal crosslinker simultaneously makes to form tridimensional network between viscosity modifier and gelling material particles, and concrete disintegration bleeding problem is greatly reduced, improves the workability of concrete.Obtained concrete viscosity conditioning agent and other additive compatibilities are good, do not influence the strength development of concrete, especially under conditions of low-cementitious material, can effectively solve the problems, such as concrete disintegration bleeding.
Description
Technical field
The present invention relates to concrete admixture field, and in particular to a kind of concrete viscosity conditioning agent and preparation method thereof.
Background technology
With the continuous development of Architectural Structure Design and high-rise building, construction it is also proposed more to concrete performance
High requirement.The continuous increase of reinforcing bar density, often requires that concrete in the continuous complication of concrete component and building element
With big fluidised form, if but mixture it is excessively dilute, laminated segregation phenomenon easily occurs for concrete, easily cause stifled pump, construction part leakage pour
With the accident such as firming body intensity is not up to standard, the quality and service life of concrete works are influenceed.In particular with concrete former material
The continuous deterioration of material, this problem are more prominent.
At present, the effective way to solve the above problems is thickener of the admixture suitably with the viscous effect of water conservation tune to reduce
A series of problems caused by the bleeding isolation that polycarboxylate water-reducer sensitiveness is brought.But most of thickener, such as：Fiber
Element, welan gum, sodium alginate, polyvinyl alcohol, polyacrylamide, EVA rubber powders, Sodium Polyacrylate etc. exist with polycarboxylate water-reducer
The problem of incompatible, while the air-entraining effect of above-mentioned thickener, it is relatively low to also result in late strength of concrete.
The content of the invention
It is an object of the invention to provide a kind of concrete viscosity conditioning agent and preparation method thereof, and the viscosity modifier is with gathering
The concrete admixture such as carboxylic acid water reducer compatibility is good, not bleed, can significantly improve the viscosity of concrete, effectively suppress concrete
Isolation bleeding.
To achieve the above object, the technical solution adopted by the present invention is：A kind of concrete viscosity conditioning agent, it be by sun from
Sub- monomer, anionic carboxyl monomer and internal crosslinker by free-radical polymerized obtained amphiphilic polymers, the cationic monomer,
Anionic monomer, the mol ratio of internal crosslinker are 1：(0.5~5)：(0.01~0.1).
The cationic monomer general structure such as formula 1 according to such scheme,
Wherein R in formula 11Selected from hydrogen, methyl, ethyl, propyl group；R2Selected from methyl, ethyl, propyl group；R3Selected from halogen.
The cationic monomer according to such scheme is acrylyl oxy-ethyl-trimethyl salmiac, methylacryoyloxyethyl
Trimethyl ammonium chloride, acrylyl oxy-ethyl triethyl ammonium chloride, acrylyl oxy-ethyl tripropyl ammonium chloride, methacryloxypropyl second
TEBA, methylacryoyloxyethyl tripropyl ammonium chloride, acrylyl oxy-ethyl-trimethyl ammonium bromide, acryloyl-oxy
Ethyl triethylammonium bromide, acrylyl oxy-ethyl tripropyl ammonium bromide, methylacryoyloxyethyl triethylammonium bromide, methyl-prop
One or more in alkene acyloxyethyl tripropyl ammonium bromide and methylacryoyloxyethyl trimethylammonium bromide.
According to such scheme, the anionic carboxyl monomer is acrylic acid, methacrylic acid, maleic acid, maleic
One or more in dicarboxylic anhydride, fumaric acid and their monovalence alkali metal salt, divalence alkali metal salt, ammonium salt press any ratio
Example mixing.
According to such scheme, to reduce polymeric reaction temperature, the anionic carboxyl monomer is preferably acrylic acid and one
Valency alkali metal salt, ammonium salt；If maleic acid, maleic anhydride or fumaric acid is used alone, or select anti-butylene two
Acid and maleic acid or the mixture of maleic anhydride, need appropriate raising polymeric reaction temperature to reduce maleic two
Acid, maleic anhydride, fumaric monomer residue.
According to such scheme, the internal crosslinker is the crosslinking agent containing two and two or more unsaturated double-bond, such as：N,
N'- methylene-bisacrylamides, N, N'- methylenebismethacrylamides, diallyldimethylammonium chloride, diallyl third
Diethyl adipate, polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, glycerol tri-acrylate, glycerine front three
One or more in base acrylate are mixed by any proportioning.Internal crosslinker is preferably N, N'- containing two unsaturated double-bonds
Methylene-bisacrylamide, N, N'- methylenebismethacrylamides, diallyldimethylammonium chloride.
According to such scheme, the concrete viscosity conditioning agent amphiphilic polymers weight average molecular weight range is 600,000~500
Ten thousand.Preferable weight-average molecular weight scope is 800,000~2,000,000 polymer.
A kind of preparation method of above-mentioned concrete viscosity conditioning agent, comprises the following steps：By cationic monomer, anion carboxylic
Base monomer and internal crosslinker are 1 in molar ratio：(0.5~5)：(0.01~0.1) is dissolved in deionized water, is excluding air
Under the conditions of, add initiator and trigger polymerization, reaction temperature is 20~80 DEG C, and the reaction time is 2~5h, and reaction uses concentration after terminating
PH to 5~8 is adjusted for 30wt% sodium hydrate aqueous solution, obtains the solidifying native viscosity modifier.
According to such scheme, redox type initiator is made up of oxidant constituents and reducing agent component, oxidant constituents
For the thermal decomposition initiating, reducing agent component is bisulfites, sulphite, ascorbic acid, thiosulfate, pyrosulfurous acid
The mol ratio of one or more in salt and ferrous salt, oxidant constituents and reducing agent component>1:1.
When carrying out radical polymerization using the redox type initiator, free radical can be produced at a lower temperature and drawn
Hair polymerization, and with reaction discharge substantial amounts of heat and elevate the temperature, temperature reaches heat decomposition type initiator
During decomposition temperature, the decomposition of second segment heat decomposition type initiator can be triggered, make whole polymerisation more complete.
According to such scheme, the dosage of the initiator (accounts for cationic monomer and anionic monomer for 0.01~10wt%
The mass percent of gross mass), preferable amount is 0.1~2wt%.
According to such scheme, the cationic monomer and anionic monomer are polymerize under aqueous conditions, the aqueous solution
The concentration of cationic monomer and anion is 5~50wt%, preferably 10~30wt%.
According to such scheme, the solid content of obtained concrete viscosity conditioning agent is 10%~30%.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention is obtained using cationic monomer, anionic carboxyl monomer and internal crosslinker by free-radical polymerized
Amphiphilic polymers, the amphiphilic polymers have obvious anti-poly- electric matter property, show preferable Efficient Adhesive Promotion；Add simultaneously in
Crosslinking agent forms tridimensional network made from making between viscosity modifier and cement granules, concrete disintegration is greatly reduced and secretes
Water, improve the workability of concrete.
(2) the concrete admixture compatibilities such as concrete viscosity conditioning agent made from and polycarboxylate water-reducer are good, not bleed,
It is remarkably improved the workability of concrete.
(3) preparation method of the present invention is simple, and cost is low, and the raw material sources being related to are wide, environment-friendly.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
A kind of concrete viscosity conditioning agent, the monomer ratio being related to be acrylyl oxy-ethyl-trimethyl salmiac, acrylic acid,
The mol ratio of N, N'- methylene-bisacrylamide is 1：0.5：0.01, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 300g's
Deionized water, 38.6g acrylyl oxy-ethyl-trimethyl salmiac, 7.2g acrylic acid, 0.31g N, N'- di-2-ethylhexylphosphine oxides third
Acrylamide, and in 70 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.Then will
0.46g ammonium persulfate is added in flask, is continuously stirred and is kept flask interior temperature to start to polymerize for 70 DEG C.Isothermal reaction
4 hours, 40 DEG C are cooled to, the sodium hydrate aqueous solution for being then 30wt% with concentration adjusts pH value of solution to 6 or so, admittedly contained
About 13% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 875700.
Embodiment 2
A kind of concrete viscosity conditioning agent, monomer propylene acyloxyethyl trimethyl ammonium chloride, acrylic acid, the N, N'- being related to
The mol ratio of methylene-bisacrylamide is 1：1：0.02, its preparation method comprises the following steps：
Acrylyl oxy-ethyl-trimethyl salmiac, acrylic acid, N, N'- methylene-bisacrylamides equipped with Dropping feeder,
Agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 300g deionized water, 38.6g acryloyl
Oxy-ethyl-trimethyl salmiac, 14.4g acrylic acid, 0.62g N, N'- methylene-bisacrylamides, and it is straight in 65 DEG C of stirrings
All dissolved to monomer.The air introduced nitrogen gas into flask displacement flask.Then 0.84g ammonium persulfate is added to burning
In bottle, continuously stir and keep flask interior temperature to start to polymerize for 65 DEG C.Isothermal reaction 4 hours, is cooled to 40 DEG C, Ran Houyong
The sodium hydrate aqueous solution that concentration is 30wt% adjusts pH value of solution to 7 or so, obtains solid containing about 15% concrete viscosity tune
Save agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 1257400.
Embodiment 3
A kind of concrete viscosity conditioning agent, monomer propylene acyloxyethyl trimethyl ammonium chloride, acrylic acid, the N, N'- being related to
The mol ratio of methylene-bisacrylamide is 1：1：0.1, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 500g's
Deionized water, 38.6g acrylyl oxy-ethyl-trimethyl salmiac, 14.4g acrylic acid, 3.1g N, N'- di-2-ethylhexylphosphine oxides third
Acrylamide, and in 60 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.Then will
0.51g ammonium persulfate is added in flask, is continuously stirred and is kept flask interior temperature to start to polymerize for 60 DEG C.Isothermal reaction
5 hours, 40 DEG C are cooled to, the sodium hydrate aqueous solution for being then 30wt% with concentration adjusts pH value of solution to 7 or so, admittedly contained
About 10% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 4828300.
Embodiment 4
A kind of concrete viscosity conditioning agent, monomer MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, the metering system being related to
Acid, N, the mol ratio of N'- methylene-bisacrylamides is 1：2：0.02, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 400g's
Deionized water, 41.6g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 17.2g methacrylic acid, 0.62g N, N'- are sub-
Bisacrylamide, and in 62 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.
Then 1.2g ammonium persulfate is added in flask, continuously stirs and keep flask interior temperature to start to polymerize for 62 DEG C.It is permanent
Temperature reaction 5 hours, is cooled to 40 DEG C, and the sodium hydrate aqueous solution for being then 30wt% with concentration adjusts pH value of solution to 8 or so, obtains
To solid containing about 13% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 1357200.
Embodiment 5
A kind of concrete viscosity conditioning agent, monomer MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, the N being related to,
The mol ratio of N'- methylene-bisacrylamides is 1：2：0.03, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 300g's
Deionized water, 20.8g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 14.4g acrylic acid, 0.46g N, N'- methylene
Bisacrylamide, and in 62 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.Then
1.0g ammonium persulfate is added in flask, adding the monomer that 28.9g has been pre-formed into flask by Dropping feeder mixes
Compound (by by 20.8g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chlorides, 14.4g acrylic acid, 0.46g N, N'- methylene
Bisacrylamide is mixed to form), above-mentioned monomer mixture was added dropwise to complete in 2 hours.After being added dropwise to complete, 62 DEG C of constant temperature stirrings 2
Hour, 40 DEG C are cooled to, the sodium hydrate aqueous solution for being then 30wt% with concentration adjusts pH value of solution to 7 or so, admittedly contained
About 16% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 2375400.
Embodiment 6
A kind of concrete viscosity conditioning agent, monomer MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, the N being related to,
The mol ratio of N'- methylene-bisacrylamides is 1：5：0.02, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 300g's
Deionized water, 20.8g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 36.0g acrylic acid, 0.31g N, N'- methylene
Bisacrylamide, and in 40 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.Then
1.0g oxidant ammonium persulfate is added in flask, added with Dropping feeder into flask 20g reductant solutions (pass through by
0.5g sodium hydrogensulfites are dissolved in 19.5g deionized waters and formed) form redox initiation system.Above-mentioned reducing agent is small 3
When interior be added dropwise to complete.After being added dropwise to complete, continue the constant temperature at 40 DEG C and stir 2 hours, the hydroxide for being then 30wt% with concentration
Sodium water solution adjusts pH value of solution to 7 or so, obtains solid containing about 15% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 3742800.
Embodiment 7
A kind of concrete viscosity conditioning agent, the monomer propylene acyloxyethyl trimethyl ammonium chloride being related to, maleic anhydride,
The mol ratio of N, N'- methylenebismethacrylamide is 1：0.5：0.06, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 200g's
Deionized water, 20.8g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 4.9g maleic anhydride, 0.92g N, N'-
Methylenebismethacrylamide, and in 30 DEG C of stirrings until monomer all dissolves.Introduce nitrogen gas into flask displacement flask
Air.Then 0.8g oxidant ammonium persulfate is added in flask, crosses Dropping feeder and 20g reducing agents are added into flask
Solution (by the way that 0.2g dissolution of ascorbic acid is formed in 19.8g deionized waters) forms redox initiation system.It is above-mentioned to go back
Former agent was added dropwise to complete in 3 hours.After being added dropwise to complete, continue 30 DEG C of constant temperature and stir 2 hours, the hydrogen for being then 30wt% with concentration
Aqueous solution of sodium oxide adjusts pH value of solution to 7 or so, obtains solid containing about 10% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 2267900.
Embodiment 8
A kind of concrete viscosity conditioning agent, the monomer propylene acyloxyethyl trimethyl ammonium chloride being related to, maleic anhydride,
The mol ratio of diallyldimethylammonium chloride is 1：1：0.05, its preparation method comprises the following steps：
Equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen gatherer four-hole bottle in, add 300g's
Deionized water, 41.6g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 19.6g maleic anhydride, 1.6g two allyls
Base alkyl dimethyl ammonium chloride, and in 45 DEG C of stirrings until monomer all dissolves.The air introduced nitrogen gas into flask displacement flask.
Then 1.2g oxidant hydrogen peroxide is added in flask, adding 20g reductant solutions into flask with Dropping feeder (passes through
0.2g dissolution of ascorbic acid is formed in 19.8g deionized waters) form redox initiation system.Above-mentioned reducing agent is small 3
When interior be added dropwise to complete.After being added dropwise to complete, continue 45 DEG C of constant temperature and stir 2 hours, the sodium hydroxide water for being then 30wt% with concentration
Solution adjusts pH value of solution to 7 or so, obtains solid containing about 17% concrete viscosity conditioning agent.
The present embodiment products obtained therefrom concrete viscosity conditioning agent is carried out using polyethylene glycol as standard specimen using gel permeation chromatography
Measure, its weight average molecular weight are 1964700.
Concrete viscosity conditioning agent made from the embodiment of the present invention 1~8 is applied to concrete, carries out mechanical property and pressure
Power bleeding rate is tested, and method of testing is with reference to GB/T50080-2002《Normal concrete mix method for testing performance standard》With
GB/T50081-2002《Standard for test methods of mechanical properties of ordinary concrete》, test result is shown in Table 1.
The concrete is made up of binder materials, Yueyang river sand, coarse aggregate and water, and wherein binder materials content is 380kg/
m3(including cement and flyash, wherein cement consumption cement is 310kg/m3, flyash 70kg/m3, cement is the new PO of China
42.5R, flyash are I levels ash), Yueyang river sand content is 760kg/m3(modulus of fineness 2.6), coarse aggregate content are
1110kg/m3(for 5~30 continuous grading basalt), water-cement ratio 0.41.
The concrete viscosity conditioning agent implementation result of table 1
Test result shows that the normal concrete pressured bleeding of adding Concrete viscosity modifier is not 72%, concrete
Occurs the phenomenon for isolating bleeding after placing 20 minutes.And after mixing concrete viscosity conditioning agent, concrete pressure bleeding rate is 5
~16%, preferable Efficient Adhesive Promotion is shown, workability is good, it is ensured that the smooth construction of concrete, while do not influence coagulation
Native strength development.
Each raw material and its bound value, interval value of the present invention can realize the present invention, technique of the invention ginseng
The lower limit value and interval value of number (such as temperature, time) can realize the present invention, embodiment numerous to list herein.More than
Described is only the preferred embodiment of the present invention, it is noted that for the person of ordinary skill of the art, is not departing from this
On the premise of innovation and creation are conceived, some modifications and variations can also be made, these belong to protection scope of the present invention.
Claims (9)
1. a kind of concrete viscosity conditioning agent, it is using cationic monomer, anionic carboxyl monomer and internal crosslinker as polymerizable raw material
Form, the cationic monomer, anionic carboxyl monomer, the mol ratio of internal crosslinker are 1：(0.5~5)：(0.01~0.1),
Its preparation method comprises the following steps：It is 1 in molar ratio by cationic monomer, anionic carboxyl monomer and internal crosslinker：(0.5
~5)：(0.01~0.1) is dissolved in deionized water, under conditions of air is excluded, is added initiator and is triggered polymerization, polymerisation
Temperature is 20~80 DEG C, and the time is 2~5h, is eventually adding alkali lye regulation pH to 5~8, obtains the concrete viscosity conditioning agent；System
The solid content of the concrete viscosity conditioning agent obtained is 10~30%；
The anionic carboxyl monomer is acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid
And their alkali metal salt, one or more in ammonium salt.
2. concrete viscosity conditioning agent according to claim 1, it is characterised in that the cationic monomer general structure is such as
R in formula 1, wherein formula 11Selected from hydrogen, methyl, ethyl, propyl group；R2Selected from methyl, ethyl, propyl group；R3Selected from halogen.
3. concrete viscosity conditioning agent according to claim 1, it is characterised in that the cationic monomer is acryloyl-oxy
Ethyl-trimethyl salmiac, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylyl oxy-ethyl triethyl ammonium chloride, acryloyl
Oxygen ethyl tripropyl ammonium chloride, methylacryoyloxyethyl triethyl ammonium chloride, methylacryoyloxyethyl tripropyl ammonium chloride,
Acrylyl oxy-ethyl-trimethyl ammonium bromide, acrylyl oxy-ethyl triethylammonium bromide, acrylyl oxy-ethyl tripropyl ammonium bromide, first
Base acrylyl oxy-ethyl triethylammonium bromide, methylacryoyloxyethyl tripropyl ammonium bromide and methylacryoyloxyethyl front three
One or more in base ammonium bromide.
4. concrete viscosity conditioning agent according to claim 1, it is characterised in that the internal crosslinker contains two and two
Individual above unsaturated double-bond, is N, N'- methylene-bisacrylamides, N, N'- methylenebismethacrylamides, diallyl two
It is ammonio methacrylate, diallyl diethyl malonate, polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, sweet
One or more in oily triacrylate and glycerol trimethacrylate.
5. according to a kind of concrete viscosity conditioning agent according to any one of claims 1 to 4, it is characterised in that the coagulation
The weight average molecular weight of native viscosity modifier is 600,000~5,000,000.
6. according to the preparation method of concrete viscosity conditioning agent according to any one of claims 1 to 4, it is characterised in that bag
Include following steps：It is 1 in molar ratio by cationic monomer, anionic carboxyl monomer and internal crosslinker：(0.5~5)：(0.01~
0.1) it is dissolved in deionized water, under conditions of air is excluded, adds initiator and trigger polymerization, polymeric reaction temperature is 20~80
DEG C, the time is 2~5h, is eventually adding alkali lye regulation pH to 5~8, obtains the concrete viscosity conditioning agent.
A kind of 7. preparation method of concrete viscosity conditioning agent according to claim 6, it is characterised in that the initiator
For heat decomposition type initiator or redox type initiator.
A kind of 8. preparation method of concrete viscosity conditioning agent according to claim 7, it is characterised in that the thermal decomposition
Type initiator is the one or more in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate and hydrogen peroxide；Redox type initiator by
Oxidant constituents and reducing agent component composition, oxidant constituents are the thermal decomposition initiating, and reducing agent component is bisulfite
One or more in salt, sulphite, ascorbic acid, thiosulfate, pyrosulfite and ferrous salt, oxidant constituents and also
The mol ratio of former agent component>1:1.
A kind of 9. preparation method of concrete viscosity conditioning agent according to right wants 6, it is characterised in that the polymerisation
Initiator amount is the 0.1~5% of cationic monomer and anionic carboxyl monomer mass summation.
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| CN105837740B (en) * | 2016-04-01 | 2018-01-02 | 贵州铁建恒发新材料科技股份有限公司 | A kind of concrete viscosity conditioning agent and preparation method thereof |
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| CN117164276B (en) * | 2023-11-03 | 2024-01-05 | 四川蜀道建筑科技有限公司 | Dispersing agent for high-density silica fume, preparation method and silica fume slurry |
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| CN102083874A (en) * | 2008-06-27 | 2011-06-01 | 建筑研究和技术有限公司 | Time-delayed super-absorbent polymers |
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