CN109384413A - A kind of preparation method of block defoaming type concrete admixture - Google Patents
A kind of preparation method of block defoaming type concrete admixture Download PDFInfo
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- CN109384413A CN109384413A CN201811580970.8A CN201811580970A CN109384413A CN 109384413 A CN109384413 A CN 109384413A CN 201811580970 A CN201811580970 A CN 201811580970A CN 109384413 A CN109384413 A CN 109384413A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to build additive technical field, more particularly to a kind of preparation method of block defoaming type concrete admixture, include the following steps: that unsaturated polyether monomer A is added in a kettle, unsaturated polyether monomer B, unsaturation defoaming monomer, acrylic acid, complex reducing agent, methylpropene sodium sulfonate, Mohr's salt and deionized water, it is stirred, after being completely dissolved, hydrogen peroxide is added, continue to stir, and unsaturated polyether monomer A is added, unsaturated polyether monomer C, acrylic acid, unsaturated amino compounds, n-vinyl pyrrolidone and deionized water, then heat temperature raising, mixed solution I and mixed solution II are added dropwise simultaneously, hydrogen peroxide is added after being added dropwise to complete in solution I and mixed solution II to be mixed into reaction kettle again, then it cools after keeping the temperature, block defoaming type concrete admixture can be obtained.The present invention can eliminate inside concrete deleterious bubbles, improve the stability in concrete beneficial to bubble, while not influencing water-reducing rate.
Description
Technical field
The invention belongs to build additive technical field, and in particular to a kind of system of block defoaming type concrete admixture
Preparation Method.
Background technique
Concrete is the important materials of modern construction engineering, in deionization water conservancy, deionization water power, bridge, high-speed iron
The key projects such as road, highway and common furniture construction engineering have all obtained a large amount of application, for monolithic architecture safety
Quality, construction period, cost etc. have great influence.And the use of concrete admixture, the stream of concrete mix can be made
Dynamic degree greatly improves, or be greatly reduced in the case where keeping identical mobility concrete mix use deionized water
Amount, while can make concrete that there is high-durability, thus high-flowing concrete can be made, pump concrete, high intensity
Performance concrete and high compact concrete etc., and be able to satisfy many special circumstances under application demand, be realize it is mixed
The indispensable important component of the core and modern concrete that solidifying soil industry " environmental protection, low-carbon, ecology " is developed, has very
Big development potentiality and development space.
Concrete admixture has excellent dispersion performance, concrete can be made at low dosage to reach preferable stream
Dynamic property can pass free radical copolymerization in principle according to MOLECULE DESIGN and close polymerizable structural unit during the preparation process
At the concrete admixture of predetermined structure and performance, usually by containing carboxylic acid group, sulfonic group, ester group and polyethylene oxide base etc. one
A little monomers with unsaturated group are synthesized by free radicals copolymerization reaction.In the polymerization preparation process of concrete admixture,
Different monomers make molecule with certain Molecular Geometries, special knot to condense together at random or regularly
Structure determines its superior function.
Since concrete admixture is surfactant, during concrete mixes and stirs, especially construction, process of vibrating
In with control be readily incorporated the irregular unstable bubble of more size, lead to stomata, honeycomb, pitted skin of concrete surface etc.
The generation of defect reduces the compactness of concrete, influences the quality of concrete, general using by adding defoaming agent control table
Face bubble improves the workability of concrete, or in one layer of release agent of template brush, to guarantee concrete quality.Defoaming agent master
It wants organosiloxane class, polyethers and organophosphorus compounds, after compounding concrete admixture defoaming agent, also will be greatly reduced coagulation
Native workability reduces concrete dispersion effect, also concrete slump can be made to have certain loss；Defoaming agent, which is added, can also disappear
The part micro-bubble beneficial to concrete, causes the closely knit Xinghe frost resistance of concrete to be affected；Defoaming agent and concrete
The compatibility of additive is generally poor, is easy to produce separation after placing for a long time, will affect the function and effect of defoaming.Therefore
In recent years, the technology path with the group of defoaming function is introduced in the molecular structure of concrete admixture, is increasingly subject to weight
Depending on.
Summary of the invention
It is an object of the invention to overcome prior art defect, a kind of system of block defoaming type concrete admixture is provided
Preparation Method.
Technical scheme is as follows:
By weight:
It is poly- that 60-80 parts of unsaturations are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
The unsaturated defoaming monomer of B, 1-3 parts of unsaturated polyether monomer of A, 60-80 parts of ether monomer, 5-15 parts of acrylic acid, 0.1-0.6 parts multiple
Close reducing agent, 0.8-2 parts of methylpropene sodium sulfonates, 0.01-0.05 parts of Mohr's salts and 110-130 parts of deionized waters；
Starting agitating device is stirred, and thermostat is controlled at 25-45 DEG C, and after material is completely dissolved, 1- is added
3 parts of hydrogen peroxide continue to stir 15min, then stop stirring；
It after 2-4h, is again started up agitating device and is stirred, and 20-40 parts of unsaturated polyethers are added into reaction kettle
A, 10-15 parts of unsaturated polyether monomer C, 3-6 part acrylic acid of monomer, 2-5 parts of unsaturated amino compounds, 1-2 parts of N- vinyl
Pyrrolidones and 30 parts of deionized waters；
Then it is heated to 50-70 DEG C, mixed solution I and mixed solution II then is added dropwise simultaneously with Dropping feeder,
Middle mixed solution I is configured by 2-5 parts of oxidants and 30 parts of deionized waters, and mixed solution II is by 0.3-0.6 parts of formaldehyde time sulphur
Sour hydrogen sodium, 0.2-0.5 parts of chain-transferring agents and 30 parts of deionized waters configure, and mixed solution I should drip in 1.5-2h
Finish, mixed solution II should be added dropwise in 2-2.5h, mixed solution I and mixed solution II be added dropwise to complete after again toward reaction kettle
2-5 parts of hydrogen peroxide of middle addition cool after then keeping the temperature 1h, block defoaming type concrete admixture can be obtained.
Further, unsaturated polyether monomer A includes such as flowering structure (a):
H(OCH2CH2)p(OCH2CH2CH2)qOCH2CH2CR1=CH2 (a)
Wherein, p is integer, and 10≤p≤15；Q is integer, and 3≤q≤5；R1For H or CH3。
Further, unsaturated polyether monomer B includes such as flowering structure (b):
H(OCH2CH2)w(OCH2CH2CH2)xO(CH2)yO(CH2)zCR2=CH2 (b)
Wherein, w is integer, and 10≤w≤15；X is integer, and 5≤x≤8；Y and z is integer greater than 0, and 2≤y+
z≤5；；R2For H or CH3。
Further, unsaturated defoaming monomer is butynediols diallyl ether, butynediol ethoxylate, 3,5-
One of dimethyl -1- hexin -3- alcohol, the different oxide of 2,4,7,9- tetramethyl -5- decine -4,7- glycol.
Further, complex reducing agent by weight, has following composition:
2- hydroxyl -2- sulfinatoacetic acid disodium salt: 30-70%；
2- hydroxyl -2- sulfonatoacetic acid disodium salt: 1-5%；
L-AA: 5-15%；
It is a kind of in sodium dithionite, potassium hyposulfite or zinc dithionite: 5-45%；
It is a kind of in sodium carbonate, sodium bicarbonate, potassium carbonate or saleratus: 5-10%.
Further, unsaturated polyether monomer C includes such as flowering structure (c):
CH2=CR3CH2OO(CH2CH2CH2O)m(CH2CH2O)nOCH2CR4=CH2 (c)
Wherein, m is integer, and 2≤m≤3；N is integer, and 12≤n≤18；R3, R4For H or CH3。
Further, unsaturated amino compounds are D- propargylglycine, DL- propargylglycine, carbamic acid 2-
Propine base ester, (2S) -2- amino butyl- 3- acetylenic acid, (2S) -2- amino -4- pentinoic acid, (2R) -2- amino -5- hexin.
Further, oxidant is one of hydrogen peroxide, ammonium persulfate, sodium peroxydisulfate, potassium peroxydisulfate.
Further, chain-transferring agent is one of thioacetic acid, mercaptopropionic acid, mercaptoethanol.
The beneficial effects of the present invention are: using aqueous free radical copolymerization, using unsaturated monomer, initiator,
Chain-transferring agent etc., which is synthesized by two-step process, prepares block polymer, has strong operability, reaction process is easy to control, to anti-
Answer condition responsive low, it is easy to industrialized production the features such as.By the polyethers for introducing different type and length in molecular side chain
Side chain can regulate and control concrete admixture and steric configuration and unfold degree in concrete heterogeneous system；By in molecular backbone
Defoaming building stone is introduced, the function of concrete admixture defoaming is assigned, eliminates inside concrete deleterious bubbles, improves coagulation
Beneficial to the stability of bubble in soil, while not influencing water-reducing rate.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to solve
The present invention is released, is not intended to limit the present invention.
Wherein, in embodiment 1-4, the ingredient and ratio of used complex reducing agent are as listed in table 1.
1 complex reducing agent ingredient of table and ratio
Embodiment 1
By weight, 70 parts of H are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
(OCH2CH2)10(OCH2CH2CH2)3OCH2CH2CCH3=CH2, 70 parts of H (OCH2CH2)15(OCH2CH2CH2)8OCH2CH2OCH2CH2CCH3=CH2, 1 part of butynediols diallyl ether, 15 parts of acrylic acid, 0.1 part of complex reducing agent, 2 parts
Methylpropene sodium sulfonate, 0.01 part of Mohr's salt and 110 parts of deionized waters, starting agitating device are stirred, thermostat control temperature
Degree is 35 DEG C, and after material is completely dissolved, 3 parts of hydrogen peroxide are added, and continues to stir 15min, then stops stirring, to 3h
Afterwards, it is again started up agitating device to be stirred, and 20 parts of H (OCH is added into reaction kettle2CH2)10(OCH2CH2CH2)3OCH2CH2CCH3=CH2, 15 parts of CH2=CHCH2OO(CH2CH2CH2O)2(CH2CH2O)12OCH2CH=CH2, 3 parts of acrylic acid, 5
Part D- propargylglycine, 1 part of n-vinyl pyrrolidone and 30 parts of deionized waters, are then heated to 50 DEG C, then
With Dropping feeder simultaneously mixed solution I and mixed solution II is added dropwise, wherein mixed solution I by 3 parts of potassium peroxydisulfates and 30 parts go from
Sub- water configures, and mixed solution II is configured by 0.5 part of rongalite, 0.2 part of thioacetic acid and 30 parts of deionized waters
It forms, mixed solution I should be added dropwise in 1.5h, and mixed solution II should be added dropwise in 2h, solution to be mixed I and mixed
It closes after solution II is added dropwise to complete and 2 parts of hydrogen peroxide is added into reaction kettle again, cool after keeping the temperature 1h, block can be obtained
Defoaming type concrete admixture.
Embodiment 2
By weight, 75 parts of H are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
(OCH2CH2)11(OCH2CH2CH2)4OCH2CH2CH=CH2, 60 parts of H (OCH2CH2)13(OCH2CH2CH2)5OCH2CH2CH2OCH2CH2CH=CH2, 2 parts of butynediol ethoxylate, 10 parts of acrylic acid, 0.5 part of complex reducing agent, 1.5
Part methylpropene sodium sulfonate, 0.03 part of Mohr's salt and 115 parts of deionized waters, starting agitating device are stirred, thermostat control
Temperature is 25 DEG C, and after material is completely dissolved, 2.5 parts of hydrogen peroxide are added, and continues to stir 15min, then stops stirring, to
It after 3h, is again started up agitating device and is stirred, and 30 parts of H (OCH are added into reaction kettle2CH2)11(OCH2CH2CH2)4OCH2CH2CH=CH2, 14 parts of CH2=CCH3CH2OO(CH2CH2CH2O)3(CH2CH2O)18OCH2CCH3=CH2, 6 parts of acrylic acid,
3 parts of DL- propargylglycines, 1.4 parts of n-vinyl pyrrolidone and 30 parts of deionized waters, are heated to 70 DEG C, then use
Mixed solution I and mixed solution II is added dropwise simultaneously in Dropping feeder, and wherein mixed solution I is by 5 parts of hydrogen peroxide and 30 parts of deionizations
Water configures, mixed solution II by 0.3 part of rongalite, 0.5 part of mercaptopropionic acid and the configuration of 30 parts of deionized waters and
At mixed solution I should be added dropwise in 2h, and mixed solution II should be added dropwise in 2.5h, solution I to be mixed and mixing
3 parts of hydrogen peroxide are added after being added dropwise to complete in solution II into reaction kettle again, cool after keeping the temperature 1h, block can be obtained and disappear
Alveolitoid concrete admixture.
Embodiment 3
By weight, 60 parts of H are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
(OCH2CH2)12(OCH2CH2CH2)5OCH2CH2CH=CH2, 80 parts of H (OCH2CH2)16(OCH2CH2CH2)6OCH2OCH2CH2CH2CH
=CH2, 2 parts of 3,5- dimethyl -1- hexin -3- alcohol, 8 parts of acrylic acid, 0.3 part of complex reducing agent, 1.2 parts of methacrylic sulfonic acids
Sodium, 0.05 part of Mohr's salt and 120 parts of deionized waters, starting agitating device be stirred, thermostat controlled at 45 DEG C, when
After material is completely dissolved, 1.5 parts of hydrogen peroxide are added, continues to stir 15min, then stops stirring, after 2h, be again started up
Agitating device is stirred, and 40 parts of H (OCH are added into reaction kettle2CH2)12(OCH2CH2CH2)5OCH2CH2CH=CH2, 10
Part CH2=CCH3CH2OO(CH2CH2CH2O)3(CH2CH2O)16OCH2CH=CH2, 5 parts of acrylic acid, 2 parts of carbamic acid 2- propine
Base ester, 1.6 parts of n-vinyl pyrrolidone and 30 parts of deionized waters, are heated to 60 DEG C, are then dripped simultaneously with Dropping feeder
Add mixed solution I and mixed solution II, wherein mixed solution I is configured by 2 parts of sodium peroxydisulfates and 30 parts of deionized waters, is mixed
It closes solution II to be configured by 0.6 part of rongalite, 0.3 part of thioacetic acid and 30 parts of deionized waters, mixed solution I
It should be added dropwise in 2h, mixed solution II should be added dropwise in 2h, and solution I and mixed solution II to be mixed are added dropwise to complete
3 parts of hydrogen peroxide are added into reaction kettle again afterwards, cools after keeping the temperature 1h, it is additional that block defoaming type concrete can be obtained
Agent.
Embodiment 4
By weight, 80 parts of H are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
(OCH2CH2)15(OCH2CH2CH2)4OCH2CH2CCH3=CH2, 70 parts of H (OCH2CH2)10(OCH2CH2CH2)7OCH2CH2CH2CH2OCH2CHCH2, 3 part 2,4,7, the 9- different oxides of tetramethyl -5- decine -4,7- glycol, 5 parts of acrylic acid,
0.6 part of complex reducing agent, 0.8 part of methylpropene sodium sulfonate, 0.04 part of Mohr's salt and 130 parts of deionized waters start agitating device
Stirring, thermostat is controlled at 40 DEG C, and after material is completely dissolved, 1 part of hydrogen peroxide is added, and continues to stir 15min, so
Stop stirring afterwards, after 4h, be again started up agitating device and be stirred, and 38 parts of H (OCH are added into reaction kettle2CH2)15
(OCH2CH2CH2)4OCH2CH2CCH3=CH2, 12 parts of CH2=CCH3CH2OO(CH2CH2CH2O)2(CH2CH2O)14OCH2CH=
CH2, 4 parts of acrylic acid, 4 parts of (2S) -2- amino butyl- 3- acetylenic acids, 2 parts of n-vinyl pyrrolidone and 30 parts of deionized waters, heating
60 DEG C are warming up to, mixed solution I and mixed solution II then is added dropwise simultaneously with Dropping feeder, wherein mixed solution I is by 4 parts of mistakes
Ammonium sulfate and 30 parts of deionized waters configure, mixed solution II by 0.4 part of rongalite, 0.4 part of mercaptoethanol and
30 parts of deionized waters configure, and mixed solution I should be added dropwise in 1.5h, and mixed solution II should drip in 2.5h
Finish, 5 parts of hydrogen peroxide are added after being added dropwise to complete in solution I and mixed solution II to be mixed into reaction kettle again, keep the temperature cooling after 1h
Cooling, can be obtained block defoaming type concrete admixture.
By the embodiment 1-4 sample synthesized and comparative sample (commercial standard type high-performance water reducing agent, HPWR-S),
It is " common according to GB/T 50080-2016 " Standard for test methods of properties of ordinary concrete mixture standard " and GB/T 50081-2016
Mechanical performance of concrete test method standard " carry out concrete mixture characteristic test method and properties of hardened concrete test.
The main raw material(s) that performance test uses:
Cement (C): 42.5 ordinary portland cement of P.O, crop field Hong Shi Cement Co., Ltd；
Flyash (FA): II grade of flyash, Xiamen Sha Ye trade Co., Ltd；
Miberal powder (SL): S95 grades, Fujian Triratna Iron And Steel Co., Ltd；
Sand (S): fineness modulus 2.8, clay content is less than 1%, Xiamen Wan Xiangtong Industrial Co., Ltd.；
Stone (G): 5-25mm graded broken stone, Xiamen is along building materials Co., Ltd of heap of stone；
Test water (W): tap water meets the regulation of JGJ 63-2006 " concrete water standard ".
The concrete mix that performance test uses is shown in Table 2, and performance test data is shown in Table 3.
2 concrete mix of table
| Raw material | C | FA | SL | S | G | W |
| Dosage/(kg/m3) | 260 | 65 | 65 | 775 | 1005 | 165 |
3 concrete test performance of table
From the performance test data of table 3, it can be seen that technical solution of the present invention has defoaming effect, while will not shadow
It rings and arrives dispersion effect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, therefore, as long as with
Any modifications, equivalent replacements, and improvements made by present specification etc., should be included in protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of preparation method of block defoaming type concrete admixture, characterized by the following steps:
By weight:
60-80 parts of unsaturated polyether monomers are added in the reaction kettle with thermostat, agitating device, Dropping feeder and nitrogen tube
A, 60-80 parts of B, 1-3 parts of unsaturated polyether monomer unsaturated defoaming monomers, 5-15 parts of acrylic acid, 0.1-0.6 parts of composite reductions
Agent, 0.8-2 parts of methylpropene sodium sulfonates, 0.01-0.05 parts of Mohr's salts and 110-130 parts of deionized waters；
Start the agitating device to be stirred, the thermostat after material is completely dissolved, adds controlled at 25-45 DEG C
Enter 1-3 parts of hydrogen peroxide, continues to stir 15min, then stop stirring；
It after 2-4h, is again started up the agitating device and is stirred, and 20-40 parts of unsaturations are added into the reaction kettle and gather
A, 10-15 parts of unsaturated polyether monomer C, 3-6 part acrylic acid of ether monomer, 2-5 parts of unsaturated amino compounds, 1-2 parts of N- ethylene
Base pyrrolidones and 30 parts of deionized waters；
Then it is heated to 50-70 DEG C, mixed solution I and mixed solution II then is added dropwise simultaneously with the Dropping feeder,
Described in mixed solution I configured by 2-5 parts of oxidants and 30 parts of deionized waters, the mixed solution II is by 0.3-0.6 parts
Rongalite, 0.2-0.5 part chain-transferring agent and 30 parts of deionized waters configure, and the mixed solution I should be in 1.5-
It is added dropwise in 2h, the mixed solution II should be added dropwise in 2-2.5h, to the mixed solution I and the mixed solution
II be added dropwise to complete after again into the reaction kettle be added 2-5 part hydrogen peroxide, then heat preservation 1h after cool, can be obtained embedding
Section defoaming type concrete admixture.
2. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Unsaturated polyether monomer A includes such as flowering structure (a):
H(OCH2CH2)p(OCH2CH2CH2)qOCH2CH2CR1=CH2 (a)
Wherein, p is integer, and 10≤p≤15；Q is integer, and 3≤q≤5；R1For H or CH3。
3. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Unsaturated polyether monomer B includes such as flowering structure (b):
H(OCH2CH2)w(OCH2CH2CH2)xO(CH2)yO(CH2)zCR2=CH2 (b)
Wherein, w is integer, and 10≤w≤15；X is integer, and 5≤x≤8；Y and z is integer greater than 0, and 2≤y+z≤
5；；R2For H or CH3。
4. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Unsaturation defoaming monomer be butynediols diallyl ether, butynediol ethoxylate, 3,5- dimethyl -1- hexin -3- alcohol,
One of different oxide of 2,4,7,9- tetramethyl -5- decine -4,7- glycol.
5. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Complex reducing agent by weight, has following composition:
2- hydroxyl -2- sulfinatoacetic acid disodium salt: 30-70%；
2- hydroxyl -2- sulfonatoacetic acid disodium salt: 1-5%；
L-AA: 5-15%；
It is a kind of in sodium dithionite, potassium hyposulfite or zinc dithionite: 5-45%；
It is a kind of in sodium carbonate, sodium bicarbonate, potassium carbonate or saleratus: 5-10%.
6. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Unsaturated polyether monomer C includes such as flowering structure (C):
CH2=CR3CH2OO(CH2CH2CH2O)m(CH2CH2O)nOCH2CR4=CH2 (C)
Wherein, m is integer, and 2≤m≤3；N is integer, and 12≤n≤18；R3, R4For H or CH3。
7. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Unsaturated amino compounds are D- propargylglycine, DL- propargylglycine, carbamic acid 2-propynyl ester, (2S) -2- ammonia
Base butyl- 3- acetylenic acid, (2S) -2- amino -4- pentinoic acid, (2R) -2- amino -5- hexin.
8. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Oxidant is one of hydrogen peroxide, ammonium persulfate, sodium peroxydisulfate, potassium peroxydisulfate.
9. a kind of preparation method of block defoaming type concrete admixture as described in claim 1, it is characterised in that: described
Chain-transferring agent is one of thioacetic acid, mercaptopropionic acid, mercaptoethanol.
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| CN107778418A (en) * | 2017-11-16 | 2018-03-09 | 科之杰新材料集团有限公司 | A kind of efficiently defoaming type polycarboxylate water-reducer and preparation method thereof |
| CN107814886A (en) * | 2017-11-16 | 2018-03-20 | 科之杰新材料集团有限公司 | A kind of defoaming type polycarboxylate water-reducer and preparation method thereof |
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