CN111393583A - Amino propane sulfonic acid inner salt type amphoteric concrete water reducing agent and preparation method thereof - Google Patents
Amino propane sulfonic acid inner salt type amphoteric concrete water reducing agent 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
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses an aminopropanesulfonic acid inner salt type amphoteric concrete water reducing agent and a preparation method thereof, the method is formed by polymerizing acrylic acid, itaconic acid, sodium methallylsulfonate, polyether macromonomer and N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt under the action of a peroxide initiator, the prepared polycarboxylate water reducing agent contains an aminopropanesulfonic acid inner salt type amphoteric structure, the stability and the dispersion water reducing effect of the polycarboxylate water reducing agent are not influenced, the inner salt structure can show electroneutrality or release cations and anions along with the acid-base property of an environmental system during use, the aminopropanesulfonic acid inner salt type amphoteric water reducing agent can respectively form a stable structure with cation and anion areas on cement, fly ash, mineral powder and other particles in a concrete system, and the aminopropanesulfonic acid inner salt type amphoteric concrete water reducing agent has good water reducing and mud resisting properties, the preparation process is scientific and reasonable and has no pollution, High water reducing rate, high mud resistance and the like, high cost performance and good market application prospect.
Description
Technical Field
The invention relates to a concrete admixture, in particular to an aminopropanesulfonic acid inner salt type amphoteric concrete water reducer and a preparation method thereof.
Background
The polycarboxylate superplasticizer is a cement superplasticizer which has the largest using amount and the most extensive application at present, has the advantages of high water reducing rate, good dispersibility, low mixing amount, large selection range of monomers for preparation, no pollution in the preparation process, and can regulate and control the performance of the polycarboxylate superplasticizer by selecting the monomers and changing the mixture ratio; the polycarboxylate superplasticizer has the defects of being sensitive to the mud content of cement and sand in a concrete system, easily causing bleeding and segregation and seriously influencing the stable use of the polycarboxylate superplasticizer. The polycarboxylate superplasticizer is usually obtained by free radical polymerization of an acrylic monomer, carboxylic acid containing double bonds and a polyether macromonomer, and the acrylic monomer, the carboxylic acid containing double bonds and the polyether macromonomer are more in variety, so that the components and the proportion of the conventional polycarboxylate superplasticizer during preparation need to be adjusted according to actual application requirements, and actually, different manufacturers have ratios and process conditions which are screened according to application when producing the polycarboxylate superplasticizer. Therefore, the polycarboxylic acid water reducing agent is a hot spot in recent years, and the formula and the synthesis process thereof are continuously researched and adjusted.
The currently used polycarboxylate superplasticizers are mainly anionic polycarboxylate superplasticizers obtained by copolymerizing anionic monomers and nonionic monomers, and the varieties and the using amount of the amphoteric polycarboxylate superplasticizers are few. Researches show that the amphoteric polycarboxylic acid water reducer has better application performances such as water reducing and mud resisting effects. The preparation of the amphoteric polycarboxylic acid water reducing agent is not as simple as adding some cationic monomers into raw materials, and has strict requirements on the structure, performance, dosage and the like of the cationic monomers. The reason that the amphoteric polycarboxylic acid water reducing agent is small in quantity and difficult to prepare is mainly that: (1) the monomer containing quaternary ammonium salt type cations with double bonds capable of free radical polymerization is only a few of diallyl dimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride and the like, and the amphoteric polycarboxylate water reducer prepared by using the monomer has strong dispersibility and water reducing property, but because the cationic property exists in the form of quaternary ammonium salt and chloride anion bonds, the cationic property of the quaternary ammonium salt is strong in water system and has high degree of freedom, and is easy to combine with surrounding anion groups, gel is easy to form by the cationic monomer, and the effect of the cationic monomer on cement particles is strong, so that the use effect is influenced, the content of the cationic monomer in the water reducer monomer is generally about 1%, and if the content is high, the polycarboxylate water reducer is coagulated, and the water reducing and dispersing effects are reduced; (2) if the organic amine invisible cationic monomers containing double bonds such as dimethylaminoethyl methacrylate, diallylamine and the like are selected, the monomers hardly show cationic property in the alkaline environment of concrete, so that the effect of improving the dispersion water-reducing effect of the polycarboxylate water reducer by an amphoteric structure is limited; (3) the main cationic monomers used at present, such as diallyl dimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride and the like, contain chloride ions, and the chloride ions have a corrosive effect on reinforcing steel bars in concrete, so that the use of the cationic monomers in the amphoteric polycarboxylic acid water reducing agent is strictly controlled and limited.
Disclosure of Invention
The invention aims to provide an aminopropanesulfonic acid inner salt type amphoteric concrete water reducer and a preparation method thereof, the prepared amphoteric concrete water reducer solves the problems of self stability and difficult regulation and control of cationic monomer content of the existing water reducer, and has high water reducing rate and high mud resistance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of an aminopropanesulfonic acid inner salt type amphoteric concrete water reducer comprises the following steps:
adding 85-95 parts of polyether macromonomer and 90-102 parts of water into a reactor according to the mass parts, uniformly stirring, keeping the temperature in a system at 40-50 ℃, adding 0.3-0.5 part of persulfate, and uniformly stirring for later use;
step two, mixing 9-12 parts of acrylic acid, 2-3 parts of itaconic acid, 1-2 parts of sodium methallyl sulfonate, 5-8 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 60-70 parts of water, and uniformly stirring to obtain a monomer mixed solution to be dripped;
step three, uniformly mixing 0.3-0.5 part of vitamin C, 0.25-0.35 part of mercaptoethanol and 30-40 parts of water to form an initiation regulator solution to be dripped;
and step four, respectively dropwise adding the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three into the solution prepared in the step one, wherein the dropwise adding time is 2.5-3 hours, continuously stirring and reacting for 2-3 hours after dropwise adding, cooling to 30-40 ℃, regulating the pH value to 6.5-7.0 by using sodium hydroxide with the mass fraction of 40%, and obtaining the product, namely the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
Further, the polyether macromonomer is one or a mixture of more of allyl alcohol polyoxyethylene ether, methyl allyl alcohol polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether, the molecular weight is 2100-2600, the water content is less than or equal to 1%, the hydroxyl value is 2100-2200 mgKOH/g, the degree of unsaturation is 0.3-0.35 mmol, and the pH of a 1% aqueous solution is 5.0-7.0.
Furthermore, the purity of the acrylic acid, the itaconic acid, the sodium methallyl sulfonate and the N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt is more than or equal to 98 percent.
Further, the persulfate is ammonium persulfate, sodium persulfate or potassium persulfate, and the content of the persulfate is more than 99%.
Further, the content of the vitamin C and the mercaptoethanol is more than 99 percent.
An aminopropanesulfonic acid inner salt type amphoteric concrete water reducer has a molecular structural formula as follows:
wherein a, b, c, d and e are the number of structural units.
Further, the molecular weight is 7-11 ten thousand, when the solid mixing amount of the water reducing agent is 0.15-0.17% of the mass of the cement, the water reducing rate is 38-45%, and the anti-mud content is 12-15%.
Compared with the prior art, the invention has the beneficial effects that:
(1) the amphoteric polycarboxylate superplasticizer is prepared by selecting aminopropanesulfonic acid inner salt type amphoteric monomer N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt polymer as a cationic monomer.
(2) When the prepared aminopropanesulfonic acid inner salt type amphoteric concrete water reducer acts with a concrete system, the inner salt structure can display nonionic, cationic and anionic ions along with different pH values of an environment system, and under a stronger alkaline environment of a cement system, the annular inner salt type electric neutral structure is subjected to ring opening to form a quaternary ammonium cationic and sulfonate anionic amphoteric ion structure which can be respectively combined with the anionic and cationic ions on cement, fly ash, mineral powder and other particles in the concrete system, so that the effects of forming adsorption, dispersion, barrier and winding layers on cement by polycarboxylate water reducer molecules are improved, and the prepared aminopropanesulfonic acid inner salt type amphoteric concrete water reducer has better dispersion and water reduction effects compared with the traditional anionic-nonionic polycarboxylate water reducer.
(3) The traditional anionic polycarboxylate superplasticizer has an electric double layer structure formed on cement and other particles, and the polycarboxylate superplasticizer prepared by the method disclosed by the invention can form an adsorption layer structure of a three-electric layer on the surface of cement, so that the polycarboxylate superplasticizer has a better dispersion effect, and further shows higher effects of reducing water, resisting mud, reducing viscosity and increasing fluidity.
(4) Compared with products obtained by adopting dimethyl diallyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride, the product does not contain chloride ions, and has better durability when being used for concrete.
(5) The molecular weight of the water reducing agent is 7-11 ten thousand, the solid mixing amount is 0.15-0.17% of the cement mass, the water reducing rate can reach 38-45%, the mud resistant content can reach 12-15%, the empty time for reducing the viscosity of C60 concrete is characterized by 6-8 seconds, and the compressive strength and the flexural strength are respectively improved by 12-18% and 14-19% compared with the corresponding polycarboxylic acid water reducing agent without cations.
(6) The preparation process is scientific and reasonable, no pollution is generated, and the product has the performances of micro air entraining, high water reducing rate, high mud resistance and the like, has high cost performance and has good market application prospect.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are not intended to limit the invention thereto.
The invention provides a preparation method of an aminopropanesulfonic acid inner salt type amphoteric concrete water reducer, which specifically comprises the following steps:
step one, adding 85-95 parts of polyether macromonomer and 90-102 parts of water into a reactor by mass, uniformly stirring, keeping the temperature in a system at 40-50 ℃, and then adding 0.3-0.5 part persulfate and uniformly stirring for later use.
And step two, mixing 9-12 parts of acrylic acid, 2-3 parts of itaconic acid, 1-2 parts of sodium methallyl sulfonate, 5-8 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 60-70 parts of water, and uniformly stirring to obtain the monomer mixed solution to be dripped.
And step three, uniformly mixing 0.3-0.5 part of vitamin C, 0.25-0.35 part of mercaptoethanol and 30-40 parts of water to form the initiation regulator solution needing to be dripped.
And step four, respectively dripping the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three into the solution prepared in the step one, wherein the dripping time is 2.5-3 hours, continuously stirring and reacting for 2-3 hours after the dripping is finished, then cooling to 30-40 ℃, neutralizing the product obtained in the step four by using sodium hydroxide with the mass fraction of 40%, and regulating and controlling the pH value to be 6.5-7.0, wherein the product is the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
The polyether macromonomer is one or a mixture of allyl alcohol polyoxyethylene ether, methyl allyl alcohol polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether, and is of industrial grade, the molecular weight is 2100-2600, the water content is less than or equal to 1%, the hydroxyl value is 2100-2200 mgKOH/g, the degree of unsaturation is 0.3-0.35 mmol, and the pH of a 1% aqueous solution is 5.0-7.0.
The purity of the acrylic acid, the itaconic acid, the sodium methallyl sulfonate and the N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt is more than or equal to 98 percent.
The persulfate is ammonium persulfate, sodium persulfate and potassium persulfate, and the content of the persulfate is more than 99%.
The initiator is vitamin C, and the content of the vitamin C is more than 99 percent;
the molecular weight regulator is one of mercaptoethanol, mercaptoacetic acid and mercaptopropionic acid, and the content is more than 98 percent;
the molecular weight of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is 7-11 ten thousand, the solid mixing amount is 0.15-0.17% of the cement mass, the water reduction rate can reach 38-45%, and the anti-mud content can reach 12-15%.
The reaction equation for preparing the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is as follows:
the first embodiment is as follows:
step one, adding 90 parts of polyether macromonomer and 96 parts of water into a reactor by mass, uniformly stirring, keeping the temperature in a system at 45 ℃, and then adding 0.4 part of persulfate and uniformly stirring for later use.
Step two, mixing and stirring 11 parts of acrylic acid, 2.5 parts of itaconic acid, 1.5 parts of sodium methallyl sulfonate, 6.5 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 65 parts of water uniformly to obtain the monomer mixed solution to be dripped.
And step three, uniformly mixing 0.4 part of vitamin C, 0.30 part of mercaptoethanol and 35 parts of water to form an initiating regulator solution needing to be dropwise added.
And step four, respectively dripping the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three and the initiation regulator solution into the solution prepared in the step one, wherein the dripping time is 2.8 hours, continuously stirring and reacting for 2.5 hours after the dripping is finished, then cooling to 35 ℃, neutralizing the product obtained in the step four by using sodium hydroxide with the mass fraction of 40% to obtain a product, and regulating the pH value to be 6.7, wherein the product is the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
The molecular weight of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is 7 ten thousand, the solid mixing amount is 0.17 percent of the cement mass, the water reducing rate can reach 38 percent, the mud resistance content can reach 12 percent, the viscosity of high-grade C60 concrete is obviously reduced, the viscosity is characterized by the air-remaining time as 8 seconds, and the compressive strength and the flexural strength are respectively improved by 12 percent and 18 percent compared with a control sample.
The prepared amino propane sulfonic acid inner salt type amphoteric concrete water reducing agent has a molecular structural formula as follows:
example two:
step one, adding 85 parts of polyether macromonomer and 90 parts of water into a reactor according to the mass parts, uniformly stirring, keeping the temperature in a system at 40 ℃, and then adding 0.3 part of persulfate and uniformly stirring for later use.
And step two, mixing and stirring 9 parts of acrylic acid, 2 parts of itaconic acid, 1 part of sodium methallyl sulfonate, 5 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 60 parts of water uniformly to obtain the monomer mixed solution to be dripped.
And step three, uniformly mixing 0.3 part of vitamin C, 0.25 part of mercaptoethanol and 30 parts of water to form an initiating regulator solution needing to be dropwise added.
And step four, respectively dripping the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three and the initiation regulator solution into the solution prepared in the step one, wherein the dripping time is 2.5 hours, continuously stirring and reacting for 2 hours after the dripping is finished, then cooling to 30 ℃, neutralizing the product obtained in the step four by using sodium hydroxide with the mass fraction of 40% to obtain a product, and regulating the pH value to be 6.5, wherein the product is the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
The molecular weight of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is 9 ten thousand, the solid mixing amount is 0.17 percent of the cement mass, the water reducing rate can reach 42 percent, the mud resistance content can reach 13 percent, the viscosity of high-grade C60 concrete is obviously reduced, the viscosity is characterized by the air-remaining time as 7 seconds, and the compressive strength and the flexural strength are respectively improved by 15 percent and 16 percent compared with a control sample.
Example three:
step one, adding 95 parts of polyether macromonomer and 102 parts of water into a reactor according to the mass parts, uniformly stirring, keeping the temperature in a system at 50 ℃, and then adding 0.5 part of persulfate and uniformly stirring for later use.
And step two, mixing and stirring uniformly 12 parts of acrylic acid, 3 parts of itaconic acid, 2 parts of sodium methallyl sulfonate and 8 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt with 70 parts of water to obtain a monomer mixed solution to be dripped.
And step three, uniformly mixing 0.5 part of vitamin C, 0.35 part of mercaptoethanol and 40 parts of water to form an initiating regulator solution needing to be dropwise added.
And step four, respectively dripping the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three and the initiation regulator solution into the solution prepared in the step one, wherein the dripping time is 3 hours, continuously stirring and reacting for 3 hours after the dripping is finished, then cooling to 40 ℃, neutralizing the product obtained in the step four by using sodium hydroxide with the mass fraction of 40% to obtain a product, and regulating the pH value to be 7.0, wherein the product is the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
The molecular weight of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is 11 ten thousand, the solid mixing amount is 0.15 percent of the cement mass, the water reducing rate can reach 45 percent, the mud resistance content can reach 15 percent, the viscosity of high-grade C60 concrete is obviously reduced, the viscosity is characterized by the air-remaining time as 6 seconds, and the compressive strength and the flexural strength are respectively improved by 18 percent and 19 percent compared with a reference sample.
Comparative example:
(1) the control sample is a polycarboxylate superplasticizer without cationic monomers, and the synthesis process conditions and method are the same as those of the invention. The molecular weight of the polycarboxylic acid water reducer of the control sample is 6-11 ten thousand, the solid mixing amount is 0.17-0.19% of the cement mass, the water reducing rate can reach 21-35%, the anti-mud content can reach 6-10%, the high-grade C60 concrete viscosity is characterized by 18-24 seconds by the air-remaining time, and the compressive strength and the flexural strength are respectively improved by 22-25% and 18-23% compared with the blank sample.
(2) Formulation of C60 concrete: 440 parts of 42.5 cement, 80 parts of fly ash, 603 parts of river sand, 1073 parts of continuous base matched macadam, 13.5 parts of 8% polycarboxylic acid water reducing agent and 150 parts of water.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A preparation method of an aminopropanesulfonic acid inner salt type amphoteric concrete water reducer is characterized by comprising the following steps:
adding 85-95 parts of polyether macromonomer and 90-102 parts of water into a reactor according to the mass parts, uniformly stirring, keeping the temperature in a system at 40-50 ℃, adding 0.3-0.5 part of persulfate, and uniformly stirring for later use;
step two, mixing 9-12 parts of acrylic acid, 2-3 parts of itaconic acid, 1-2 parts of sodium methallyl sulfonate, 5-8 parts of N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 60-70 parts of water, and uniformly stirring to obtain a monomer mixed solution to be dripped;
step three, uniformly mixing 0.3-0.5 part of vitamin C, 0.25-0.35 part of mercaptoethanol and 30-40 parts of water to form an initiation regulator solution to be dripped;
and step four, respectively dropwise adding the monomer mixed solution prepared in the step two and the initiation regulator solution prepared in the step three into the solution prepared in the step one, wherein the dropwise adding time is 2.5-3 hours, continuously stirring and reacting for 2-3 hours after dropwise adding, cooling to 30-40 ℃, regulating the pH value to 6.5-7.0 by using sodium hydroxide with the mass fraction of 40%, and obtaining the product, namely the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer.
2. The preparation method of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer according to claim 1, which is characterized in that: the polyether macromonomer is one or a mixture of more of allyl alcohol polyoxyethylene ether, methyl allyl alcohol polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether, the molecular weight is 2100-2600, the water content is less than or equal to 1%, the hydroxyl value is 2100-2200 mgKOH/g, the unsaturation degree is 0.3-0.35 mmol, and the pH value of a 1% aqueous solution is 5.0-7.0.
3. The preparation method of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer according to claim 1, which is characterized in that: the purity of the acrylic acid, the itaconic acid, the sodium methallyl sulfonate and the N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt is more than or equal to 98 percent.
4. The preparation method of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer according to claim 1, which is characterized in that: the persulfate is ammonium persulfate, sodium persulfate or potassium persulfate, and the content of the persulfate is more than 99%.
5. The preparation method of the aminopropanesulfonic acid inner salt type amphoteric concrete water reducer according to claim 1, which is characterized in that: the content of the vitamin C and the mercaptoethanol is more than 99 percent.
6. An aminopropanesulfonic acid inner salt type amphoteric concrete water reducer prepared according to the preparation method of claims 1-5, which is characterized in that the molecular structural formula is as follows:
wherein a, b, c, d and e are the number of structural units.
7. The aminopropanesulfonic acid inner salt type amphoteric concrete water reducer according to claim 6, wherein: the molecular weight is 7-11 ten thousand, when the solid mixing amount of the water reducing agent is 0.15-0.17% of the mass of the cement, the water reducing rate is 38-45%, and the anti-mud content is 12-15%.
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| CN113968692A (en) * | 2021-12-03 | 2022-01-25 | 湖南先锋建材有限公司 | High-strength concrete viscosity-reducing polycarboxylate superplasticizer 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 |
| CN116040975A (en) * | 2023-01-16 | 2023-05-02 | 杭州构建新型材料有限公司 | Mud-resistant polycarboxylate superplasticizer and preparation method thereof |
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| CN109627395A (en) * | 2018-12-14 | 2019-04-16 | 中科院广州化学有限公司南雄材料生产基地 | A kind of both sexes polycarboxylate water-reducer and preparation method |
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