CN109626860B - Preparation method of block viscosity-reducing concrete admixture - Google Patents
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/34—Flow improvers
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Abstract
The invention belongs to the technical field of building admixtures, and particularly relates to a preparation method of a block viscosity-reducing concrete admixture, which comprises the following steps: adding an unsaturated polyether monomer A, an unsaturated polyether monomer B, methyl methacrylate, acrylic acid, an unsaturated fluorine compound, a composite reducing agent, a chain transfer agent and deionized water into a reaction kettle, stirring, adding hydrogen peroxide after the materials are completely dissolved, continuing stirring, stirring again after 2-6h, adding the unsaturated polyether monomer B, the unsaturated polyether monomer C, hydroxymethyl acrylamide, hydrogen peroxide and deionized water, heating, beginning to drip the mixed solution I and the mixed solution II, adding an oxidizing agent into the reaction kettle after dripping is completed, then preserving heat for 1h, cooling and cooling to obtain the viscosity-reducing type concrete admixture. According to the invention, the hydrophobic groups are introduced into the molecular main chain, so that the solid particle spacing is reduced, the particle friction is reduced, the viscosity of the fresh concrete slurry is reduced, and the concrete constructability is improved.
Description
Technical Field
The invention belongs to the technical field of building admixtures, and particularly relates to a preparation method of a block viscosity-reducing concrete admixture.
Background
The concrete is an important material of modern building engineering, and has important influence on the whole building safety quality, construction period, cost and the like, and the use of the concrete admixture can greatly improve the fluidity of the concrete mixture, or greatly reduce the deionized water amount of the concrete mixture under the condition of keeping the same fluidity, and simultaneously can ensure that the concrete has high durability, so that high-fluidity concrete, pumping concrete, high-strength concrete, high-compactness concrete and the like can be prepared, the application requirements under many special conditions can be met, the concrete admixture is a core for realizing the development of environmental protection, low carbon and ecology in the concrete industry, is also an indispensable important component of modern concrete, and has very large development potential and development space.
The concrete admixture has excellent dispersing performance, can enable concrete to achieve better fluidity under the condition of lower mixing amount, can synthesize a polymerizable structural unit into the concrete admixture with preset structure and performance through free radical copolymerization reaction according to the principle of molecular design in the preparation process, and is usually synthesized by monomers containing carboxylic acid groups, sulfonic acid groups, ester groups, polyoxyethylene groups and the like and having unsaturated groups through the free radical copolymerization reaction. In the polymerization preparation process of the concrete admixture, different monomers are randomly or regularly polymerized together, so that molecules have certain molecular space configuration, and the excellent performance of the concrete admixture is determined by the special structure of the concrete admixture. At present, most of concrete admixtures have linear comb-shaped molecular structures, and the steric resistance effect is weaker in a multi-phase system of concrete, so that the dispersibility, the slump retention, the deionized water retention effect and the universality in deionized water slurry are required to be improved.
The key concrete building engineering generally requires that the concrete has higher strength, better durability and better stability, but the concrete must reach a certain strength grade, the concrete strength is improved mainly by reducing the glue ratio of deionized water, so that the concrete has higher viscosity, a series of construction problems such as concrete stirring, transportation, pumping and the like are caused, and the popularization and application of high-strength and ultrahigh-strength concrete are limited to a great extent.
The pumping construction of high-rise building concrete also has high requirements on the workability of the concrete, and in order to achieve a higher strength grade, the concrete can be generally realized by methods of reducing the deionized water-cement ratio, increasing the using amount of a cementing material, increasing the proportion of a mineral admixture and the like. The deionized water has low glue ratio, the deionized water in unit volume is reduced, so that the solid particle spacing is reduced, the particle friction and other effects are enhanced, the glue material consumption is high, the surplus slurry body thickness is large, and mineral admixtures with large specific surface area and irregular particle morphology, such as silica fume and the like, are added into the general mixing ratio, so that the problems of the viscosity increase, the flowability reduction and the like of fresh concrete are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a block viscosity reduction type concrete admixture.
The technical scheme of the invention is as follows:
the weight portion of the material is as follows:
adding 180 parts of unsaturated polyether monomer A, 2-8 parts of unsaturated polyether monomer B, 2-6 parts of methyl methacrylate, 5-15 parts of acrylic acid, 0.5-1.5 parts of unsaturated fluorine compound, 0.8-1.8 parts of composite reducing agent, 0.5-1.5 parts of chain transfer agent and 130 parts of 100-doped deionized water into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen pipe;
starting a stirring device for stirring, controlling the temperature of a temperature controller to be 30-40 ℃, adding 1-5 parts of hydrogen peroxide after materials are completely dissolved, continuing stirring for 30min, and then stopping stirring;
after 2-6h, starting the stirring device again for stirring, and adding 1-5 parts of unsaturated polyether monomer B, 5-10 parts of unsaturated polyether monomer C, 1-2 parts of hydroxymethyl acrylamide, 1-2 parts of hydrogen peroxide and 30 parts of deionized water into the reaction kettle;
and then heating to 50-60 ℃, starting to dropwise add a mixed solution I prepared from 2-5 parts of acrylic acid, 1-4 parts of methacryloyloxyethyl trimethyl ammonium chloride, 1-5 parts of unsaturated amino compound and 30 parts of deionized water and a mixed solution II prepared from 0.2-0.5 part of composite reducing agent, 0.1-0.5 part of chain transfer agent and 30 parts of deionized water by using a dropwise adding device, wherein the mixed solution I and the mixed solution II are dropwise added within 0.5-1.5h, after the dropwise addition of the mixed solution I and the mixed solution II is finished, 0.5-1 part of oxidant is added into a reaction kettle, then heat preservation is carried out for 1h, and cooling is carried out to obtain the viscosity reduction type concrete admixture.
Further, the unsaturated polyether monomer a comprises the following structure (a):
H(OCH2CH2)p(OCH2CH2CH2)qOCH2CH2CR1＝CH2 (a)
wherein p is an integer, and p is more than or equal to 40 and less than or equal to 50; q is an integer, and q is more than or equal to 1 and less than or equal to 2; r1Is H or CH3。
Further, the unsaturated polyether monomer B comprises the following structure (B):
H(OCH2CH2)m(OCH2CH2CH2)nO(CH2)xO(C6H4)(CH2)yCR2＝CH2 (b)
wherein m is an integer, and m is more than or equal to 25 and less than or equal to 30; n is an integer, and n is more than or equal to 2 and less than or equal to 4; x and y are integers greater than 0, and x + y is greater than or equal to 2 and less than or equal to 4; r2Is H or CH3。
Further, the unsaturated fluorine compound is one of 2-fluoroacrylic acid, 2-fluoroacrylic acid methyl ester, and 2-fluoroacrylic acid ethyl ester.
Further, the composite reducing agent has the following composition in parts by weight:
2-hydroxy-2-sulfinatoacetic acid disodium salt: 10 to 30 percent;
2-hydroxy-2-sulfoacetic acid disodium salt: 5 to 15 percent;
l-ascorbic acid: 35 to 45 percent;
one of sodium hydrosulfite, potassium hydrosulfite or zinc hydrosulfite: 20 to 30 percent;
one of sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate: 5 to 15 percent.
Further, the chain transfer agent is one of thioglycolic acid, mercaptopropionic acid and mercaptoethanol.
Further, the unsaturated polyether monomer C comprises the following structure (C):
CH3O(CH2CH2O)h(CH2CH2CH2O)kCH2CH2OOCH2CR3＝CH2 (c)
wherein h is an integer, and h is more than or equal to 35 and less than or equal to 50; k is an integer, and k is more than or equal to 1 and less than or equal to 3; r3Is H or CH3。
Further, the unsaturated amino compound is one of D-allyl glycine, 2-amino-4-methyl-4-pentenoic acid, 2-amino-3-butenoic acid and 2-amino-5-hexenoic acid.
Further, the oxidant is one of hydrogen peroxide, ammonium persulfate, sodium persulfate and potassium persulfate.
The invention has the beneficial effects that: the block polymer is prepared by aqueous solution free radical copolymerization and by adopting unsaturated monomers, initiators, chain transfer agents and the like through a two-step method, and the preparation method has the characteristics of strong operability, easy control of reaction process, low sensitivity to reaction conditions, easy industrial production and the like. Polyether side chains of different types and lengths are introduced into the molecular side chains, so that the spatial configuration and the stretching degree of the concrete admixture in a concrete multiphase system can be regulated and controlled, and the thickness of a water film layer formed by the concrete admixture and the amount of free water in the system can be changed; by introducing hydrophobic groups into the main molecular chain, the distance between solid particles is reduced, the particle friction is reduced, the viscosity of fresh concrete slurry is reduced, and the concrete constructability is improved.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In examples 1 to 4, the components and the proportions of the composite reducing agent used are shown in table 1.
TABLE 1 Complex Reductant Components and proportions
Example 1
Adding 180 parts by weight of H (OCH) into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen tube2CH2)40OCH2CH2CH2OCH2CH2CCH3＝CH28 parts of H (OCH)2CH2)25(OCH2CH2CH2)2OCH2OC6H4CH2CH＝CH26 parts of methyl methacrylate, 5 parts of acrylic acid, 0.5 part of 2-fluoroacrylic acid, 1.8 parts of composite reducing agent, 1.4 parts of thioglycollic acid and 130 parts of deionized water, starting a stirring device for stirring, controlling the temperature of a temperature controller to be 30 ℃, adding 5 parts of hydrogen peroxide after the materials are completely dissolved, continuing stirring for 30min, stopping stirring, starting the stirring device again for stirring after 5h, and adding 5 parts of hydrogen peroxide into a reaction kettle
H(OCH2CH2)25(OCH2CH2CH2)2OCH2OC6H4CH2CH＝CH28 parts of CH3O(CH2CH2O)35CH2CH2CH2OCH2CH2OOCH2CH＝CH21 part of hydroxymethyl acrylamide, 1.5 parts of hydrogen peroxide and 30 parts of deionized water, heating to 50 ℃, starting to dropwise add a mixed solution I prepared from 5 parts of acrylic acid, 1 part of methacryloyloxyethyl trimethyl ammonium chloride, 2 parts of D-allylglycine and 30 parts of deionized water and a mixed solution II prepared from 0.4 part of composite reducing agent, 0.4 part of thioglycolic acid and 30 parts of deionized water by using a dropwise adding device, finishing dropwise adding the mixed solution I and the mixed solution II within 0.5h, adding 0.5 part of ammonium persulfate into a reaction kettle after finishing dropwise adding the mixed solution I and the mixed solution II, then preserving heat for 1h, and cooling to obtain the viscosity-reducing type concrete admixture.
Example 2
Adding 170 parts of H (OCH) into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen tube according to parts by weight2CH2)42(OCH2CH2CH2)2OCH2CH2CH＝CH26 parts of H (OCH)2CH2)26(OCH2CH2CH2)4OCH2OC6H4CH2CH2CCH3＝CH22 parts of methyl methacrylate, 8 parts of acrylic acid, 1 part of 2-fluoro ethyl acrylate, 1.5 parts of a composite reducing agent, 1.5 parts of mercaptopropionic acid and 120 parts of deionized water, starting a stirring device for stirring, controlling the temperature of a temperature controller to be 35 ℃, adding 1 part of hydrogen peroxide after the materials are completely dissolved, continuing stirring for 30min, stopping stirring, starting the stirring device again after 2H, stirring, and adding 2 parts of H (OCH) into the reaction kettle2CH2)26(OCH2CH2CH2)4OCH2OC6H4CH2CH2CCH3＝CH28 parts of CH3O(CH2CH2O)40(CH2CH2CH2O)2CH2CH2OOCH2CCH3＝CH21.2 parts of methylolacrylamide, 2 parts of hydrogen peroxide and 30 parts of deionized water, and thenHeating to 60 ℃, starting to dropwise add a mixed solution I prepared from 3 parts of acrylic acid, 3 parts of methacryloyloxyethyl trimethyl ammonium chloride, 3 parts of 2-amino-4-methyl-4-pentenoic acid and 30 parts of deionized water and a mixed solution II prepared from 0.3 part of composite reducing agent, 0.2 part of mercaptopropionic acid and 30 parts of deionized water by using a dropwise adding device, finishing dropwise adding the mixed solution I and the mixed solution II within 1.5h, adding 1 part of ammonium persulfate into the reaction kettle after finishing dropwise adding the mixed solution I and the mixed solution II, preserving heat for 1h, and cooling to obtain the viscosity-reducing concrete admixture.
Example 3
160 parts of H (OCH) are added into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen tube according to the parts by weight2CH2)46(OCH2CH2CH2)2OCH2CH2CH＝CH24 parts of H (OCH)2CH2)27(OCH2CH2CH2)3OCH2CH2OC6H4CH2CH＝CH23 parts of methyl methacrylate, 15 parts of acrylic acid, 1.5 parts of 2-fluoro ethyl acrylate, 0.8 part of composite reducing agent, 1 part of mercaptopropionic acid and 110 parts of deionized water, starting a stirring device for stirring, controlling the temperature of a temperature controller to be 40 ℃, adding 2 parts of hydrogen peroxide after the materials are completely dissolved, continuing stirring for 30min, stopping stirring, starting the stirring device again for stirring after 3H, and adding 3 parts of H (OCH) into the reaction kettle2CH2)27(OCH2CH2CH2)3OCH2CH2OC6H4CH2CH＝CH25 parts of CH3O(CH2CH2O)45(CH2CH2CH2O)3CH2CH2OOCH2CCH3＝CH21.6 parts of hydroxymethyl acrylamide, 1 part of hydrogen peroxide and 30 parts of deionized water, heating to 55 ℃, and beginning to dropwise add 2 parts of acrylic acid, 4 parts of methacryloyloxyethyl trimethyl ammonium chloride, 1 part of 2-amino-3-butenoic acid and 30 parts of methacrylic acid into the dropwise adding deviceAnd adding 1 part of ammonium persulfate into the reaction kettle after the dropwise addition of the mixed solution I and the mixed solution II is finished, then preserving the heat for 1h, and cooling to obtain the viscosity-reducing concrete admixture.
Example 4
Adding 150 parts by weight of H (OCH) into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen tube2CH2)50OCH2CH2CH2OCH2CH2CH＝CH22 parts of H (OCH)2CH2)30(OCH2CH2CH2)2OCH2CH2CH2OC6H4CH2CCH3＝CH25 parts of methyl methacrylate, 10 parts of acrylic acid, 0.8 part of 2-fluoro methyl acrylate, 1 part of composite reducing agent, 0.5 part of mercaptoethanol and 100 parts of deionized water, starting a stirring device for stirring, controlling the temperature to be 45 ℃, adding 3 parts of hydrogen peroxide after the materials are completely dissolved, continuing stirring for 30min, stopping stirring, starting the stirring device again for stirring after 6H, and adding 1 part of H (OCH) into the reaction kettle2CH2)30(OCH2CH2CH2)2OCH2CH2CH2OC6H4CH2CCH3＝CH210 parts of CH3O(CH2CH2O)50(CH2CH2CH2O)2CH2CH2OOCH2CCH3＝CH22 parts of hydroxymethyl acrylamide, 1.2 parts of hydrogen peroxide and 30 parts of deionized water, heating to 60 ℃, starting to dropwise add a mixed solution I prepared from 5 parts of acrylic acid, 2 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5 parts of 2-amino-5-hexenoic acid and 30 parts of deionized water, and a mixed solution I prepared from 0.2 part of a composite reducing agent, 0.5 part of mercaptoethanol and 30 parts of deionized water by using a dropwise adding deviceAnd (3) dropwise adding the prepared mixed solution II, the mixed solution I and the mixed solution II within 1.5h, adding 0.8 part of ammonium persulfate into the reaction kettle after dropwise adding the mixed solution I and the mixed solution II, and then, preserving heat for 1h and cooling to obtain the viscosity-reduction type concrete admixture.
The samples obtained by synthesis in examples 1-4 and a reference sample (a commercial standard high-performance water reducing agent, HPWR-S) are subjected to a concrete mixture performance test method and a hardened concrete performance test according to GB/T50080-2016 Standard test method for Performance of ordinary concrete mixtures and GB/T50081-2016 Standard test method for mechanical Performance of ordinary concrete; testing the flow time of the V-shaped funnel according to CECS 203-2006 self-compacting concrete application technical Specification; the flow time of the L-shaped box was tested using CCES 02-2004 "guide for self-compacting concrete design and construction".
The performance test adopts the following main raw materials:
cement (C): P.O 42.5.5 Portland Cement, Fujian Huarun Cement Co., Ltd;
fly Ash (FA): class II fly ash, Xiamen trade Co Ltd;
mineral powder (SL): grade S95, fujian sanbao iron and steel limited;
sand (S): the fineness modulus is 2.8, the mud content is less than 1 percent, and the mansion gate Wanxiang is the same as the practical company; stone (G): 5-25mm graded crushed stone, Xiamen Shunli building materials Co Ltd;
test water (W): tap water meets the regulation of JGJ 63-2006 Water for concrete Standard. The concrete mixing proportion adopted in the performance test is shown in table 2, and the performance test data is shown in table 3.
TABLE 2 concrete mix proportions
| Raw material | C | FA | SL | S | G | W |
| Dosage/(kg/m)3) | 360 | 40 | 60 | 780 | 1020 | 160 |
TABLE 3 concrete test Properties
From the performance test data in table 3, it can be seen that the technical scheme of the present invention has an obvious viscosity reduction effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, so that any modifications, equivalents and improvements made by the present invention as described in the specification are included in the scope of the present invention.
Claims (4)
1. A preparation method of a block viscosity-reducing concrete admixture is characterized by comprising the following steps: the method comprises the following steps:
the weight portion of the material is as follows:
adding 180 parts of unsaturated polyether monomer A, 2-8 parts of unsaturated polyether monomer B, 2-6 parts of methyl methacrylate, 5-15 parts of acrylic acid, 0.5-1.5 parts of unsaturated fluorine compound, 0.8-1.8 parts of composite reducing agent, 0.5-1.5 parts of chain transfer agent and 130 parts of 100-doped deionized water into a reaction kettle with a temperature controller, a stirring device, a dropping device and a nitrogen pipe;
starting the stirring device for stirring, controlling the temperature of the temperature controller to be 30-40 ℃, adding 1-5 parts of hydrogen peroxide after the materials are completely dissolved, continuing stirring for 30min, and then stopping stirring;
after 2-6 hours, starting the stirring device again for stirring, and adding 1-5 parts of unsaturated polyether monomer B, 5-10 parts of unsaturated polyether monomer C, 1-2 parts of hydroxymethyl acrylamide, 1-2 parts of hydrogen peroxide and 30 parts of deionized water into the reaction kettle;
heating to 50-60 ℃, starting to dropwise add a mixed solution I prepared from 2-5 parts of acrylic acid, 1-4 parts of methacryloyloxyethyl trimethyl ammonium chloride, 1-5 parts of unsaturated amino compound and 30 parts of deionized water and a mixed solution II prepared from 0.2-0.5 part of composite reducing agent, 0.1-0.5 part of chain transfer agent and 30 parts of deionized water by using the dropwise adding device, adding 0.5-1 part of oxidant into the reaction kettle after the dropwise addition of the mixed solution I and the mixed solution II is finished, preserving heat for 1h, and cooling to obtain the viscosity-reducing concrete admixture;
the unsaturated polyether monomer A comprises the following structure (a):
H(OCH2CH2)p(OCH2CH2CH2)qOCH2CH2CR1＝CH2 (a)
wherein p is an integer, and p is more than or equal to 40 and less than or equal to 50; q is an integer, and q is more than or equal to 1 and less than or equal to 2; r1Is H or CH3；
The unsaturated polyether monomer B comprises the following structure (B):
H(OCH2CH2)m(OCH2CH2CH2)nO(CH2)xO(C6H4)(CH2)yCR2＝CH2 (b)
wherein m is an integer, and m is more than or equal to 25 and less than or equal to 30; n is an integer, and n is more than or equal to 2 and less than or equal to 4; x and y are integers greater than 0, and x + y is greater than or equal to 2 and less than or equal to 4; r2Is H or CH3；
The unsaturated fluorine compound is one of 2-fluoroacrylic acid, 2-fluoroacrylic acid methyl ester and 2-fluoroacrylic acid ethyl ester;
the unsaturated polyether monomer C comprises the following structure (C):
CH3O(CH2CH2O)h(CH2CH2CH2O)kCH2CH2OOCH2CR3＝CH2 (c)
wherein h is an integer, and h is more than or equal to 35 and less than or equal to 50; k is an integer, and k is more than or equal to 1 and less than or equal to 3; r3Is H or CH3；
The unsaturated amino compound is one of D-allyl glycine, 2-amino-4-methyl-4-pentenoic acid, 2-amino-3-butenoic acid and 2-amino-5-hexenoic acid.
2. The method for preparing the block viscosity reduction type concrete admixture according to claim 1, wherein the method comprises the following steps: the composite reducing agent comprises the following components in parts by weight:
2-hydroxy-2-sulfinatoacetic acid disodium salt: 10 to 30 percent;
2-hydroxy-2-sulfoacetic acid disodium salt: 5 to 15 percent;
l-ascorbic acid: 35 to 45 percent;
one of sodium hydrosulfite, potassium hydrosulfite or zinc hydrosulfite: 20 to 30 percent;
one of sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate: 5 to 15 percent.
3. The method for preparing the block viscosity reduction type concrete admixture according to claim 1, wherein the method comprises the following steps: the chain transfer agent is one of thioglycolic acid, mercaptopropionic acid and mercaptoethanol.
4. The method for preparing the block viscosity reduction type concrete admixture according to claim 1, wherein the method comprises the following steps: the oxidant is one of hydrogen peroxide, ammonium persulfate, sodium persulfate and potassium persulfate.
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| CN105330830A (en) * | 2014-08-15 | 2016-02-17 | 辽宁奥克化学股份有限公司 | Terminal alkenyl nonsaturated polyether and purpose thereof |
| CN105271893A (en) * | 2015-10-23 | 2016-01-27 | 上海三瑞高分子材料股份有限公司 | Slump-retaining water reducer and preparation method thereof |
| CN106519139A (en) * | 2016-11-10 | 2017-03-22 | 江苏苏博特新材料股份有限公司 | Early-strength admixture and preparation method and application thereof |
| CN107200829A (en) * | 2017-07-07 | 2017-09-26 | 江苏中铁奥莱特新材料股份有限公司 | Controllable, regular polyether amine water reducer of a kind of molecular structure and preparation method thereof |
| CN109021181A (en) * | 2018-08-20 | 2018-12-18 | 四川同舟化工科技有限公司 | A kind of poly carboxylic acid series water reducer and preparation method thereof for having both viscosity reduction and protecting function of collapsing |
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