CN112724329A - Viscosity-reducing polycarboxylic acid concrete water reducer and preparation method thereof - Google Patents
Viscosity-reducing polycarboxylic acid concrete water reducer and preparation method thereof Download PDFInfo
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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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- 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
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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
- C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
- C04B2103/465—Water-sorbing agents, hygroscopic or hydrophilic agents
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a viscosity-reducing polycarboxylic acid concrete water reducer and a preparation method thereof, wherein the viscosity-reducing polycarboxylic acid concrete water reducer comprises the following steps: mixing low-molecular-weight isobutylene alcohol polyoxyethylene polyoxypropylene block polyether, isoamylol polyoxyethylene ether and a proper amount of water, controlling the temperature to be 40-60 ℃, and uniformly stirring; respectively dropwise adding a material A consisting of a mixture aqueous solution of unsaturated carboxylic acid, a functional monomer and a chain transfer agent and a material B consisting of a mixture aqueous solution of the chain transfer agent and a reducing agent, wherein the dropwise adding time is controlled to be 2-4 hours; after the dropwise addition is finished, curing is carried out for 1-1.5 h at the temperature of 30-50 ℃, and the temperature is reduced to prepare the viscosity-reducing polycarboxylate superplasticizer with the solid content of 40%. The water reducing agent prepared by the invention is liquid at normal temperature, has stable storage performance, can effectively reduce the viscosity of high-grade concrete, especially machine-made sand concrete mixture, is beneficial to concrete stirring, transportation and pumping, and is especially suitable for popularization and application of pumping concrete of high-rise and super high-rise buildings and long-distance conveying concrete.
Description
Technical Field
The invention relates to the field of concrete admixtures in building materials, in particular to a viscosity-reducing polycarboxylic acid concrete water reducer and a preparation method thereof.
Background
With the increasing development of the national building industry, the consumption of concrete, which is the largest raw material in the building material, is rapidly increased, the consumption of river sand, which is the raw material of concrete, is also in a rapidly increasing trend, and due to the gradual exhaustion of sandstone resources and the implementation of the national policy for environmental protection, river sand is increasingly difficult to obtain as an important resource, and the river sand, which is used as a substitute for river sand, is gradually widely applied to building engineering. Because the machine-made sand has the characteristics of more edges and corners, more serious broken gradation phenomenon, more and unstable stone powder content, the traditional common polycarboxylate superplasticizer has higher water reducing rate and can play a certain role in dispersing cement particles, but a large number of polar adsorption groups of the traditional common polycarboxylate superplasticizer can cause stronger interaction force to be generated among adsorption interfaces, so that the viscosity of concrete is increased, the phenomena of stickiness, hardness, poor wrapping property and the like of newly-mixed concrete, particularly high-grade concrete are easy to occur, and the quality and construction of the concrete are seriously influenced.
At present, the conventional means for solving the problems are mainly to improve the admixture mixing amount, the water consumption of concrete, the gas content of concrete and the like, but the conventional means inevitably introduce other problems in the methods, the molecular structure of the polycarboxylic acid concrete admixture is high in designability, and the adaptability of the polycarboxylic acid water reducing agent to different concretes can be realized by controlling the polymerization degree of a main chain, the density of a side chain and the types of functional groups. As an important raw material for improving the performance of concrete, the concrete has obvious effect on improving the performance and the construction performance of the concrete. The functional polycarboxylic acid water reducing agent is designed, can effectively reduce the water consumption and the consumption of cementing materials of concrete, and can adjust the cohesiveness and the water retention of the concrete, thereby being one of the main ways for improving the workability of the concrete.
The invention patent with the publication number of CN 109651566A discloses a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof; the viscosity reduction type polycarboxylate superplasticizer is prepared by polymerization reaction of the following raw materials: the block modified unsaturated polyoxyethylene ether, the unsaturated carboxylic acid and the functional monomer are prepared by copolymerization reaction and alkali neutralization under the action of an initiator and a chain transfer agent. According to the scheme, the block modified unsaturated polyoxyethylene ether is used as a raw material, the block polyether side chain contains a hydrophobic group, the molecular structure stretching degree is better, structural optimization is carried out by adding different functional groups, and the viscosity reduction water reducer with excellent performance can be obtained. However, the viscosity-reducing water reducer synthesized by the method has high mixing amount, has the side effect of consuming the water-reducing water reducer to a certain extent, has low cost performance and has low selectivity on machine-made sand materials.
The invention patent with publication number CN 108003301A provides a preparation method of a viscosity-reducing polycarboxylate superplasticizer, which is prepared by bulk polymerization reaction and specifically comprises the following steps: (1) mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, controlling the temperature to be 40-60 ℃, uniformly stirring, and then adding an initiator and a mixture of unsaturated carboxylic acid, unsaturated carboxylic acid hydroxyalkyl ester and a chain transfer agent; (2) and (2) curing for 1-1.5 h after the step (1) is finished, and cooling to obtain the viscosity-reducing polycarboxylic acid water reducer. The bulk polymerization reaction is carried out at relatively low temperature, and has strong operability, mild condition and low energy consumption. The polycarboxylic acid water reducing agent prepared by the method can effectively reduce the viscosity of concrete mixtures, but the viscosity reduction effect of the scheme is not ideal.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a viscosity reduction type polycarboxylate concrete water reducer and a preparation method thereof, aiming at overcoming the problems of insufficient concrete scattering, viscosity and wrapping property, large slump loss and the like of machine-made sand concrete in the using process.
The technical scheme adopted by the invention for solving the technical problems is as follows: the viscosity reduction type polycarboxylic acid concrete water reducer comprises, by weight, 240 parts of isobutylene alcohol polyoxyethylene polyoxypropylene block polyether 120-containing material, 250 parts of prenyl alcohol polyoxyethylene ether 150-containing material, 12-50 parts of unsaturated carboxylic acid, 5-20 parts of functional monomer, 0.5-2.0 parts of chain transfer agent, 1-6.0 parts of oxidant, 0.1-2 parts of reducing agent, 10-40 parts of neutralizing agent and 320 parts of deionized water 220-containing material.
Meanwhile, the invention also provides a preparation method of the viscosity reduction type polycarboxylic acid concrete water reducer, which comprises the following steps,
1) mixing low-molecular-weight isobutylene alcohol polyoxyethylene polyoxypropylene block polyether, isoamylol polyoxyethylene ether and a proper amount of water, controlling the temperature to be 40-60 ℃, and uniformly stirring;
2) adding an oxidant, uniformly stirring, then respectively dropwise adding a material A consisting of a mixture aqueous solution of unsaturated carboxylic acid, a functional monomer and a chain transfer agent and a material B consisting of a mixture aqueous solution of the chain transfer agent and a reducing agent, wherein the dropwise adding time is controlled to be 2-4 hours;
3) after the dropwise addition is finished, curing is carried out for 1-1.5 h at the temperature of 30-50 ℃, and the temperature is reduced to prepare the viscosity-reducing polycarboxylate superplasticizer with the solid content of 40%.
Furthermore, the isobutylene alcohol polyoxyethylene polyoxypropylene block polyether is propylene oxide and ethylene oxide block polyether with different polymerization degrees, and the average molecular weight is 500-1200.
Furthermore, the prenol polyoxyethylene ether is a polyether monomer with the molecular weight of 3000-4000.
Further, the unsaturated carboxylic acid of the present invention is one or more of acrylic acid, itaconic acid, maleic acid, or methacrylic acid.
Furthermore, the functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, lauryl methacrylate, polyethylene glycol diacrylate or polyethylene glycol dimethacrylate.
Further, the polyethylene glycol diacrylate is an acrylate compound with the polymerization degree of ethylene glycol of 200-400.
Further, the invention provides the isobutylene alcohol polyoxyethylene polyoxypropylene block polyether: prenol polyoxyethylene ether: unsaturated carboxylic acid: functional monomer: the mass ratio of the chain transfer agent is 1: (0.75-2.2): (0.07-0.12) and (0.015-0.03): (0.003 to 0.008);
further, the mixture is dropwise added at a constant speed within 2-4 hours in the form of A, B materials; the reaction temperature of the viscosity-reducing polycarboxylic acid water reducer in the dropping process is 30-50 ℃;
furthermore, the chain transfer agent is one or more of thioglycolic acid, sulfonated mercaptoacid, mercaptopropionic acid, sodium hypophosphite or sodium methyl propenyl sulfonate; the oxidant is at least one of 30% hydrogen peroxide, ammonium persulfate, dimethyl azodiisobutyrate or diisopropyl peroxydicarbonate; the reducing agent is one or more of vitamin C, hypophosphorous acid, phosphorous acid, rongalite or sodium bisulfite; the neutralizing agent is one or two of potassium hydroxide and sodium hydroxide solution.
The invention adopts a method for the composite copolymerization of micromolecule isobutylene alcohol polyoxyethylene polyoxypropylene block polyether and prenol polyoxyethylene ether, the polyether is embedded with a hydrophobic group on a polyether structure molecule through adding propylene oxide, compared with a common polyether molecule, the polyether with an amphoteric group structure is more diversified on the molecular structure, a molecular chain can be better stretched in concrete, good dispersity is shown, meanwhile, the hydrophobic group is introduced into a molecular side chain, the HLB value can be reduced, the combination of free water and the molecule is reduced, and the effect of low viscosity is shown. In addition, the long side chain of the prenyl polyoxyethylene ether plays a role in reducing water and slump. The two side chain monomers are combined with each other to fully play the roles of reducing water and viscosity.
According to the invention, different functional groups are added to optimize the molecular chain, such as lauryl methacrylate, octadecyl methacrylate, polyethylene glycol diacrylate and other groups are introduced, so that the molecular structure of the polycarboxylate superplasticizer can be improved, the HLB value of the polycarboxylate superplasticizer molecules is adjusted, the thickness of an adsorption layer of the polycarboxylate superplasticizer is increased, the acting force among concrete particles is reduced, the agglomeration of the particles is prevented, free water among the particles is released, and a lubricating effect is achieved, so that the effect of reducing the viscosity of the concrete is achieved.
The invention has the beneficial effects that the defects in the background technology are overcome, the molecular structure of the viscosity-reducing water reducer is optimized by introducing some functional monomers, so that the viscosity-reducing water reducer has certain slump retaining property and water retaining property, the adaptability of the viscosity-reducing water reducer to poor-quality sandstone materials is improved, and the capacities of resisting segregation and bleeding are obviously improved; the micromolecule block polyether and isopentenyl polyoxyethylene ether are polymerized with functional monomers to improve the hydrophilic and oleophylic structure of polycarboxylic acid molecules, a small amount of hydrophilic cross-linking agent is added to improve the structure of the molecules, and the viscosity reduction effect of the polycarboxylic acid polymer is improved and the adaptability of the polycarboxylic acid polymer to poor-quality sandstone materials is improved through slow release.
Detailed Description
The present invention will now be described in further detail with reference to examples.
Example 1
1. 120g of isobutylene polyoxyethylene polyoxypropylene ether (average molecular weight 600) and 150g of isopentenyl polyoxyethylene ether (average molecular weight 3000) were put into a four-necked flask, and heated to 45 ℃ to be dissolved with stirring.
2. Controlling the temperature at 45 ℃, adding 4g of hydrogen peroxide (30%), stirring for 10min, and then dropwise adding a material A consisting of a mixed solution of 30g of acrylic acid, 5g of hydroxyethyl acrylate and 1.5g of sulfonated mercapto acid and a material B consisting of 0.5g of vitamin C aqueous solution at a constant speed for 3h and 3.5h respectively.
3. After the dropwise addition is finished, curing is continued for 1h, and then the temperature is reduced to 30 ℃.
4. And adding a sodium hydroxide solution into the synthesized viscosity-reducing polycarboxylate superplasticizer for neutralization, adjusting the pH to 6, and supplementing water to an effective concentration of 40% to obtain the viscosity-reducing polycarboxylate superplasticizer.
Example 2
1. 120g of isobutylene polyoxyethylene polyoxypropylene ether (average molecular weight 600) and 150g of isopentenyl polyoxyethylene ether (average molecular weight 3000) were put into a four-necked flask, and heated to 45 ℃ to be dissolved with stirring.
2. Controlling the temperature at 45 ℃, adding 4g of hydrogen peroxide (30 percent) into the kettle, stirring for 10min, and then dropwise adding a material A consisting of a mixed solution of 25g of acrylic acid, 10g of methyl methacrylate and 1.5g of sulfonated mercapto acid and a material B consisting of 0.5g of vitamin C aqueous solution at a constant speed for 3h and 3.5h respectively.
3. After the dropwise addition is finished, curing is continued for 1h, and then the temperature is reduced to 30 ℃.
4. And adding a sodium hydroxide solution into the synthesized viscosity-reducing polycarboxylate superplasticizer for neutralization, adjusting the pH to 6, and supplementing water to an effective concentration of 40% to obtain the viscosity-reducing polycarboxylate superplasticizer.
Example 3
1. 240g of isobutylene polyoxyethylene polyoxypropylene ether (average molecular weight 1200) and 180g of isopentenyl polyoxyethylene ether (average molecular weight 3000) were put into a four-necked flask, and heated to 45 ℃ to be dissolved with stirring.
2. Controlling the temperature at 45 ℃, adding 4g of hydrogen peroxide (30%), stirring for 10min, and then dropwise adding a material A consisting of a mixed solution of 30g of acrylic acid, 5g of hydroxyethyl acrylate and 1.5g of sulfonated mercapto acid and a material B consisting of 0.5g of vitamin C aqueous solution at a constant speed for 3h and 3.5h respectively.
3. After the dropwise addition is finished, curing is continued for 1h, and then the temperature is reduced to 30 ℃.
4. And adding a sodium hydroxide solution into the synthesized viscosity-reducing polycarboxylate superplasticizer for neutralization, adjusting the pH to 6, and supplementing water to an effective concentration of 40% to obtain the viscosity-reducing polycarboxylate superplasticizer.
Example 4
1. 120g of isobutylene polyoxyethylene polyoxypropylene ether (average molecular weight 1200) and 180g of isopentenyl polyoxyethylene ether (average molecular weight 3000) were put into a four-necked flask, and heated to 45 ℃ to be dissolved with stirring.
2. Controlling the temperature at 45 ℃, adding 4g of hydrogen peroxide (30 percent) into the kettle, stirring for 10min, and then dropwise adding a material A consisting of a mixed solution of 30g of acrylic acid, 5g of hydroxyethyl acrylate, 0.2g of polyethylene glycol diacrylate and 1g of sulfonated mercapto acid and a material B consisting of 0.5g of vitamin C aqueous solution at a constant speed, wherein the dropwise adding time is 3 hours and 3.5 hours respectively.
3. After the dropwise addition is finished, curing is continued for 1h, and then the temperature is reduced to 30 ℃.
4. And adding a sodium hydroxide solution into the synthesized viscosity-reducing polycarboxylate superplasticizer for neutralization, adjusting the pH to 6, and supplementing water to an effective concentration of 40% to obtain the viscosity-reducing polycarboxylate superplasticizer.
Example 5
1. 120g of isobutylene polyoxyethylene polyoxypropylene ether (average molecular weight 600) and 250g of isopentenyl polyoxyethylene ether (average molecular weight 4000) were put into a four-necked flask, heated to 45 ℃ and dissolved with stirring.
2. Controlling the temperature at 45 ℃, adding 4g of hydrogen peroxide (30%), stirring for 10min, and then dropwise adding a material A consisting of a mixed solution of 30g of acrylic acid, 5g of hydroxyethyl acrylate and 1g of sulfonated mercapto acid and a material B consisting of 0.5g of vitamin C aqueous solution at a constant speed for 3h and 3.5h respectively.
3. After the dropwise addition is finished, curing is continued for 1h, and then the temperature is reduced to 30 ℃.
4. And adding a sodium hydroxide solution into the synthesized viscosity-reducing polycarboxylate superplasticizer for neutralization, adjusting the pH to 6, and supplementing water to an effective concentration of 40% to obtain the viscosity-reducing polycarboxylate superplasticizer.
The experimental results are as follows:
preparing high-strength concrete according to the mixing proportion of C60 concrete shown in Table 1, controlling the initial expansion degree of the concrete to be 500-550 mm by adjusting the using amount of a water reducing agent under the condition of the same water-cement ratio, detecting the slump and the expansion degree of the concrete after initial and 1h, and controlling the air content to be 2.0-3.0%, and referring to the standard of the performance test method of common concrete mixtures (GB/T50080-. And the viscosity reduction effect of the viscosity reduction type polycarboxylate superplasticizer synthesized in examples 1-5 was tested by comparing a commercially available water reduction type superplasticizer with a viscosity reduction type superplasticizer model PV 415.
TABLE 1C60 machine-made Sand concrete mix proportion
TABLE 2 concrete Performance comparison Table for viscosity-reducing water reducer
As can be seen from the above table, under the condition of controlling the initial working performance of the concrete within a certain range, the time spent by the concrete flowing out of the inverted slump cone under the action of the water reducing agent prepared by the method is obviously reduced compared with the blank condition (without adding the viscosity reduction type), and the sample PV415 on the market also has relative advantages. The polycarboxylate superplasticizer prepared by the method can effectively reduce the viscosity of concrete, improve the flow rate of high-grade machine-made sand concrete, greatly improve the working performance of the concrete and basically has no influence on the strength of the concrete. In addition, the water reducing agent produced by the invention has a certain water reducing and slump retaining function, and can obviously reduce the slump loss of concrete. The method provided by the invention can be used for producing the corresponding polycarboxylate superplasticizer according to needs, solves the problems that the traditional polycarboxylate superplasticizer is easy to be adsorbed by clay and stone powder to cause overlarge viscosity of concrete mixture and poor fluidity of cement concrete, is beneficial to long-distance pumping and high-rise engineering construction of concrete, and is suitable for large-scale industrial popularization and application.
While particular embodiments of the present invention have been described in the foregoing specification, various modifications and alterations to the previously described embodiments will become apparent to those skilled in the art from this description without departing from the spirit and scope of the invention.
Claims (10)
1. The viscosity reduction type polycarboxylate concrete water reducer is characterized by comprising the following components in parts by weight: the modified functional block copolymer comprises, by weight, 240 parts of 120-one of isobutylene alcohol polyoxyethylene polyoxypropylene block polyether, 250 parts of 150-one of isopentenol polyoxyethylene ether, 12-50 parts of unsaturated carboxylic acid, 5-20 parts of functional monomer, 0.5-2.0 parts of chain transfer agent, 1-6.0 parts of oxidant, 0.1-2 parts of reducing agent, 10-40 parts of neutralizer and 320 parts of 220-one of deionized water.
2. The preparation method of the viscosity reduction type polycarboxylic acid concrete water reducer of claim 1, which is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
1) mixing low-molecular-weight isobutylene alcohol polyoxyethylene polyoxypropylene block polyether, isoamylol polyoxyethylene ether and a proper amount of water, controlling the temperature to be 40-60 ℃, and uniformly stirring;
2) adding an oxidant, uniformly stirring, then respectively dropwise adding a material A consisting of a mixture aqueous solution of unsaturated carboxylic acid, a functional monomer and a chain transfer agent and a material B consisting of a mixture aqueous solution of the chain transfer agent and a reducing agent, wherein the dropwise adding time is controlled to be 2-4 hours;
3) after the dropwise addition is finished, curing is carried out for 1-1.5 h at the temperature of 30-50 ℃, and the temperature is reduced to prepare the viscosity-reducing polycarboxylate superplasticizer with the solid content of 40%.
3. The viscosity-reducing polycarboxylic acid concrete water reducer of claim 1 or 2, which is characterized in that: the isobutenol polyoxyethylene polyoxypropylene block polyether is propylene oxide and ethylene oxide block polyether with different polymerization degrees, and the average molecular weight is 500-1200.
4. The viscosity-reducing polycarboxylic acid concrete water reducer of claim 1 or 2, which is characterized in that: the prenol polyoxyethylene ether is a polyether monomer with the molecular weight of 3000-4000.
5. The viscosity-reducing polycarboxylic acid concrete water reducer of claim 1 or 2, which is characterized in that: the unsaturated carboxylic acid is one or more of acrylic acid, itaconic acid, maleic acid or methacrylic acid.
6. The viscosity-reducing polycarboxylic acid concrete water reducer of claim 1 or 2, which is characterized in that: the functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, lauryl methacrylate, polyethylene glycol diacrylate or polyethylene glycol dimethacrylate.
7. The viscosity-reducing polycarboxylic acid concrete water reducer of claim 6, which is characterized in that: the polyethylene glycol diacrylate is an acrylate compound with the polymerization degree of ethylene glycol of 200-400.
8. The preparation method of the viscosity-reducing polycarboxylic acid concrete water reducer of claim 2, which is characterized by comprising the following steps: the isobutylene alcohol polyoxyethylene polyoxypropylene block polyether: prenol polyoxyethylene ether: unsaturated carboxylic acid: functional monomer: the mass ratio of the chain transfer agent is 1: (0.75-2.2): (0.07-0.12) and (0.015-0.03): (0.003-0.008).
9. The preparation method of the viscosity-reducing polycarboxylic acid concrete water reducer of claim 2, which is characterized by comprising the following steps: the mixture is dropwise added at a constant speed within 2-4 hours in the form of A, B materials; the reaction temperature of the viscosity-reducing polycarboxylic acid water reducer in the dropping process is 30-50 ℃.
10. The viscosity-reducing polycarboxylic acid concrete water reducer of any one of claims 1 or 2, which is characterized in that: the chain transfer agent is one or more of thioglycolic acid, sulfonated mercaptoacid, mercaptopropionic acid, sodium hypophosphite or sodium methyl propenyl sulfonate; the oxidant is at least one of 30% hydrogen peroxide, ammonium persulfate, dimethyl azodiisobutyrate or diisopropyl peroxydicarbonate; the reducing agent is one or more of vitamin C, hypophosphorous acid, phosphorous acid, rongalite or sodium bisulfite; the neutralizing agent is one or two of potassium hydroxide and sodium hydroxide solution.
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| PCT/CN2021/097841 WO2022142125A1 (en) | 2020-12-29 | 2021-06-02 | Viscosity reduction type concrete polycarboxylic acid water-reducing agent and preparation method therefor |
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| WO2022142125A1 (en) * | 2020-12-29 | 2022-07-07 | 江苏尼高科技有限公司 | Viscosity reduction type concrete polycarboxylic acid water-reducing agent and preparation method therefor |
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| CN114106269A (en) * | 2021-12-20 | 2022-03-01 | 江苏尼高科技有限公司 | High-performance viscosity-reduction type polycarboxylate concrete water reducer and preparation method thereof |
| CN114349384A (en) * | 2021-12-27 | 2022-04-15 | 湖南先锋建材有限公司 | Viscosity reduction type water reducing agent |
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| WO2022142125A1 (en) | 2022-07-07 |
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