CN111825372A - Polycarboxylic acid high-performance water reducing agent and preparation method thereof - Google Patents
Polycarboxylic acid high-performance water reducing agent and preparation method thereof Download PDFInfo
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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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- 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
- 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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Abstract
The invention discloses a polycarboxylic acid high-performance water reducing agent and a preparation method thereof, belonging to the technical field of building materials. The water reducing agent is prepared from the following components in percentage by mass of 1: 0.5 of first component and second component, the first component is prepared by taking unsaturated polyoxyethylene ether, methyl acrylate, acrylic acid, oxidant, chain transfer agent, reducing agent, liquid caustic soda and deionized water as raw materials; the second component is prepared by taking sodium lignosulphonate, diethanol monoisopropanolamine and starch hydrogel as raw materials. The invention has scientific raw material proportion, mutual synergistic effect and better compatibility among various components, and can ensure the uniform and stable storage for a long time; the shrinkage rate is low, and the durability of the concrete is effectively improved; the water reducing rate is high, the water-cement ratio can be greatly reduced, and the strength of concrete is ensured; the slump loss prevention effect is good, and the construction performance of concrete is well met; low mixing amount, obvious economic and social benefits and suitability for large-scale production.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a polycarboxylic acid high-performance water reducing agent and a preparation method thereof.
Background
The polycarboxylic acid water reducing agent is a third-generation water reducing agent with excellent comprehensive performance, and is produced and applied in developed countries such as Japan, Germany, America and the like from the end of the 80 th 20 th century. The concrete admixture has the advantages of high water reducing rate, small concrete slump loss with time, low admixture amount, great contribution to concrete strength, good environmental protection and the like, and a plurality of domestic application enterprises begin to select the polycarboxylic acid water reducing agent as the fifth necessary component of concrete from high-speed railways, passenger dedicated lines, port docks and airports and then to urban commercial concrete mixing plants. However, because the application and development time of the polycarboxylic acid high-performance water reducing agent in China is relatively short, the application and technical research is still in the initial stage, and the classical theory and common experience of compounding represented by a naphthalene water reducing agent are not applicable any more, a plurality of new problems to be solved urgently are encountered in engineering practice.
How to improve the performance of the polycarboxylate superplasticizer, improve the applicability of the polycarboxylate superplasticizer and enhance the water reducing effect of the polycarboxylate superplasticizer becomes the key point of the current research. In the currently adopted method, an external additive is added, for example, an air entraining agent is added to increase the dispersion effect, and CN20091077550.2 achieves the purpose of reducing the viscosity by compounding polyethylene glycol as a viscosity reducing component, so that the dispersion effect is improved. These methods can achieve the object, but the effect is not significant enough, resulting in an increase in cost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the high-efficiency polycarboxylic acid water reducing agent composition which is low in mixing amount and high in water reducing rate and can obviously improve the workability and rheological property of concrete.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 200 parts of unsaturated polyoxyethylene ether, 80-100 parts of methyl acrylate, 10-30 parts of acrylic acid, 10-20 parts of oxidant, 1.5-2.5 parts of chain transfer agent, 10-20 parts of reducing agent, 3-5 parts of liquid alkali and 60-90 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 5-10 parts of sodium lignosulphonate, 8-10 parts of diethanol monoisopropanolamine and 1-5 parts of starch hydrogel.
The starch hydrogel is prepared by the following method: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 5-10% in a mixed solvent of deionized water and ethanol with the volume ratio of 5-10:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 30-120 min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 2-6 days to obtain the starch hydrogel.
The unsaturated polyoxyethylene ether is isobutylene alcohol polyoxyethylene ether or prenol polyoxyethylene ether, and the average molecular weight is 2200-2400-.
The oxidant is one or more of hydrogen peroxide, ammonium persulfate and potassium persulfate.
The chain transfer agent is mercaptopropionic acid or mercaptoacetic acid.
The reducing agent is one or more of sodium hypophosphite, ascorbic acid and sodium bisulfite.
A preparation method of a polycarboxylic acid high-performance water reducing agent comprises the following steps:
1) preparing a solution A: mixing a reducing agent with 1/3 deionized water according to the proportion, and marking as material A;
2) preparing a material B: mixing a chain transfer agent, methyl acrylate and 1/3-dosage deionized water according to a proportion, and marking as material B;
3) adding unsaturated polyoxyethylene ether and 1/3-dose deionized water into a container, placing the container in a constant-temperature water bath kettle, setting the temperature of the water bath kettle to be 20-30 ℃, then adding acrylic acid into a backing material, starting stirring to dissolve a monomer, adding an oxidant, continuing stirring for 10min, then simultaneously beginning to dropwise add the solution A in the step (1) and the solution B in the step (2), wherein the dropwise adding time of the solution A is 3.5h, the dropwise adding time of the solution B is 3.0h, preserving heat for 1h after the dropwise adding is finished, then adjusting the pH value of the solution to 6 +/-1 by using 50% liquid alkali, and supplementing water to adjust the solid content to 40% to obtain a first component;
4) preparing starch hydrogel: weighing 20.0g of corn starch, preparing a starch emulsion with a solid content of 5-10% in a mixed solvent of deionized water and ethanol with a volume ratio of 5-10:1, heating the starch emulsion to 75 ℃ under stirring for gelatinization for 30-120 min, cooling to room temperature, and then placing in a refrigerator with the temperature of 4 ℃ for 2-6 days to obtain a starch hydrogel;
5) uniformly mixing sodium lignosulfonate, diethanol monoisopropanolamine and the starch hydrogel obtained in the step (4) in proportion to obtain a second component;
6) the first component and the second component are respectively packaged and then put in storage, and the first component and the second component are uniformly mixed for use.
The water reducing agent of the invention has a folding solid content of 0.1-0.15%.
Advantageous effects
The first component of the invention synthesizes the polycarboxylic acid water reducing agent which is rich in a large amount of carboxylic acid groups through free radical polymerization. The starch hydrogel in the second component can effectively adsorb and surround the polycarboxylic acid water reducing agent on one hand, and the carboxyl on the surface of the water reducing agent is fully contacted with cement and is fully complexed with calcium ions in the cement to form a coordination complex of calcium, so that the concentration of the calcium ions in a liquid phase is reduced, the formation of C-H-S gel particles is greatly reduced, and macroscopically the effects of slowing down the hydration speed of the cement, inhibiting the hydration of the cement and improving the dispersion performance of the cement particles are realized. The starch hydrogel can play a role in amplifying the effect of the polycarboxylic acid water reducing agent.
Meanwhile, the starch hydrogel is rich in a large number of hydroxyl groups, a layer of solvating water film is formed on the surfaces of cement particles through hydrogen bond association, the formation of flocculation structures among the cement particles can be reduced, and free water which is not wrapped by the flocculation structures delays the hydration process of the cement. Meanwhile, the sodium lignosulfonate has the triple effects of reducing water, retarding coagulation and entraining air, and can play a role in improving the wrapping performance of concrete. And the diethanol monoisopropanolamine can play a role in improving the early strength of the concrete.
The invention has scientific raw material proportion, mutual synergistic effect and better compatibility among various components, and can ensure the uniform and stable storage for a long time; the shrinkage rate is low, and the durability of the concrete is effectively improved; the water reducing rate is high, the water-cement ratio can be greatly reduced, and the strength of concrete is ensured; the slump loss prevention effect is good, the mixing amount is low, and the concrete construction performance is well met; has obvious economic and social benefits and is suitable for large-scale production.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
A polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 80 parts of methyl acrylate, 10 parts of acrylic acid, 10 parts of oxidant, 1.5 parts of chain transfer agent, 10 parts of reducing agent, 3 parts of liquid caustic soda and 60 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 5 parts of sodium lignosulphonate, 8 parts of diethanol monoisopropanolamine and 1 part of starch hydrogel.
The starch hydrogel is prepared by the following method: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 5% in a mixed solvent of deionized water and ethanol with the volume ratio of 5:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 30min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 2d to obtain the starch hydrogel.
The unsaturated polyoxyethylene ether is isobutylene alcohol polyoxyethylene ether or prenol polyoxyethylene ether, and the average molecular weight is 2200-2400-.
The oxidant is hydrogen peroxide.
The chain transfer agent is mercaptopropionic acid.
The reducing agent is sodium hypophosphite.
A preparation method of a polycarboxylic acid high-performance water reducing agent comprises the following steps:
1) preparing a solution A: mixing a reducing agent with 1/3 deionized water according to the proportion, and marking as material A;
2) preparing a material B: mixing a chain transfer agent, methyl acrylate and 1/3-dosage deionized water according to a proportion, and marking as material B;
3) adding unsaturated polyoxyethylene ether and 1/3-dose deionized water into a container, placing the container in a constant-temperature water bath kettle, setting the temperature of the water bath kettle to be 20-30 ℃, then adding acrylic acid into a backing material, starting stirring to dissolve a monomer, adding an oxidant, continuing stirring for 10min, then simultaneously beginning to dropwise add the solution A in the step (1) and the solution B in the step (2), wherein the dropwise adding time of the solution A is 3.5h, the dropwise adding time of the solution B is 3.0h, preserving heat for 1h after the dropwise adding is finished, then adjusting the pH value of the solution to 6 +/-1 by using 50% liquid alkali, and supplementing water to adjust the solid content to 40% to obtain a first component;
4) preparing starch hydrogel: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 5% in a mixed solvent of deionized water and ethanol with the volume ratio of 5:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 30min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 2d to obtain starch hydrogel;
5) uniformly mixing sodium lignosulfonate, diethanol monoisopropanolamine and the starch hydrogel obtained in the step (4) in proportion to obtain a second component;
6) the first component and the second component are respectively packaged and then put in storage, and the first component and the second component are uniformly mixed for use.
Example 2
A polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 150 parts of unsaturated polyoxyethylene ether, 90 parts of methyl acrylate, 20 parts of acrylic acid, 15 parts of oxidant, 2 parts of chain transfer agent, 15 parts of reducing agent, 4 parts of liquid alkali and 75 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 8 parts of sodium lignosulphonate, 9 parts of diethanol monoisopropanolamine and 3 parts of starch hydrogel.
The starch hydrogel is prepared by the following method: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 8% in a mixed solvent of deionized water and ethanol with the volume ratio of 8:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 70min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 4d to obtain the starch hydrogel.
The unsaturated polyoxyethylene ether is isobutylene alcohol polyoxyethylene ether or prenol polyoxyethylene ether, and the average molecular weight is 2200-2400-.
The oxidant is ammonium persulfate.
The chain transfer agent is thioglycolic acid.
The reducing agent is ascorbic acid.
A preparation method of a polycarboxylic acid high-performance water reducing agent comprises the following steps:
1) preparing a solution A: mixing a reducing agent with 1/3 deionized water according to the proportion, and marking as material A;
2) preparing a material B: mixing a chain transfer agent, methyl acrylate and 1/3-dosage deionized water according to a proportion, and marking as material B;
3) adding unsaturated polyoxyethylene ether and 1/3-dose deionized water into a container, placing the container in a constant-temperature water bath kettle, setting the temperature of the water bath kettle to be 20-30 ℃, then adding acrylic acid into a backing material, starting stirring to dissolve a monomer, adding an oxidant, continuing stirring for 10min, then simultaneously beginning to dropwise add the solution A in the step (1) and the solution B in the step (2), wherein the dropwise adding time of the solution A is 3.5h, the dropwise adding time of the solution B is 3.0h, preserving heat for 1h after the dropwise adding is finished, then adjusting the pH value of the solution to 6 +/-1 by using 50% liquid alkali, and supplementing water to adjust the solid content to 40% to obtain a first component;
4) preparing starch hydrogel: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 8% in a mixed solvent of deionized water and ethanol with the volume ratio of 8:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 70min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 4d to obtain starch hydrogel;
5) uniformly mixing sodium lignosulfonate, diethanol monoisopropanolamine and the starch hydrogel obtained in the step (4) in proportion to obtain a second component;
6) the first component and the second component are respectively packaged and then put in storage, and the first component and the second component are uniformly mixed for use.
Example 3
A polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 200 parts of unsaturated polyoxyethylene ether, 100 parts of methyl acrylate, 30 parts of acrylic acid, 20 parts of oxidant, 2.5 parts of chain transfer agent, 20 parts of reducing agent, 5 parts of liquid alkali and 90 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 10 parts of sodium lignosulphonate, 10 parts of diethanol monoisopropanolamine and 5 parts of starch hydrogel.
The starch hydrogel is prepared by the following method: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 10% in a mixed solvent of deionized water and ethanol with the volume ratio of 10:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 120min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 6d to obtain the starch hydrogel.
The unsaturated polyoxyethylene ether is isobutylene alcohol polyoxyethylene ether or prenol polyoxyethylene ether, and the average molecular weight is 2200-2400-.
The oxidant is potassium persulfate.
The chain transfer agent is mercaptopropionic acid.
The reducing agent is sodium bisulfite.
A preparation method of a polycarboxylic acid high-performance water reducing agent comprises the following steps:
1) preparing a solution A: mixing a reducing agent with 1/3 deionized water according to the proportion, and marking as material A;
2) preparing a material B: mixing a chain transfer agent, methyl acrylate and 1/3-dosage deionized water according to a proportion, and marking as material B;
3) adding unsaturated polyoxyethylene ether and 1/3-dose deionized water into a container, placing the container in a constant-temperature water bath kettle, setting the temperature of the water bath kettle to be 20-30 ℃, then adding acrylic acid into a backing material, starting stirring to dissolve a monomer, adding an oxidant, continuing stirring for 10min, then simultaneously beginning to dropwise add the solution A in the step (1) and the solution B in the step (2), wherein the dropwise adding time of the solution A is 3.5h, the dropwise adding time of the solution B is 3.0h, preserving heat for 1h after the dropwise adding is finished, then adjusting the pH value of the solution to 6 +/-1 by using 50% liquid alkali, and supplementing water to adjust the solid content to 40% to obtain a first component;
4) preparing starch hydrogel: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 10% in a mixed solvent of deionized water and ethanol with the volume ratio of 5-10:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 120min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 6d to obtain the starch hydrogel;
5) uniformly mixing sodium lignosulfonate, diethanol monoisopropanolamine and the starch hydrogel obtained in the step (4) in proportion to obtain a second component;
6) the first component and the second component are respectively packaged and then put in storage, and the first component and the second component are uniformly mixed for use.
Comparative example 1
A polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 200 parts of unsaturated polyoxyethylene ether, 100 parts of methyl acrylate, 30 parts of acrylic acid, 20 parts of oxidant, 2.5 parts of chain transfer agent, 20 parts of reducing agent, 5 parts of liquid alkali and 90 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 10 parts of sodium lignosulphonate, 10 parts of diethanol monoisopropanolamine and 5 parts of starch.
This comparative example is the same as example 3 except that corn starch is used directly as compared with example 3.
Comparative example 2
A polycarboxylic acid high-performance water reducing agent is prepared from the following components in a mass ratio of 1: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 200 parts of unsaturated polyoxyethylene ether, 100 parts of methyl acrylate, 30 parts of acrylic acid, 20 parts of oxidant, 2.5 parts of chain transfer agent, 20 parts of reducing agent, 5 parts of liquid alkali and 90 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 10 parts of sodium lignosulphonate and 10 parts of diethanol monoisopropanolamine.
This comparative example is identical to example 3, except that no starch hydrogel is added.
Testing the fluidity of the cement paste:
according to GB/T8077-2012 'concrete admixture homogeneity test method', P.I 42.5 reference cement is adopted, the water-cement ratio is 0.29, and the folded solid content of the water reducing agent is 0.1%.
Testing of concrete Properties
The design of the mix proportion of the test concrete is in accordance with JGJ 55-2011 design rules for the mix proportion of the common concrete, and the performance of the concrete is tested according to GB8076-2008 concrete admixture, GB/T50080-2002 Standard for the Performance test method of the common concrete mixture and GB/T50081-2002 Standard for the mechanical Performance test method of the common concrete. The commercially available water reducing agent is a high-performance polycarboxylic acid water reducing agent produced by Shandong Bohao building materials Co. The blank example did not add water reducing agent. The specific test results are shown in table 1:
TABLE 1 Water reducing agent Performance test results
TABLE 2 Water reducing agent Performance test results
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Claims (7)
1. A polycarboxylic acid high-performance water reducing agent is characterized by comprising the following components in percentage by mass: 0.5 of a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 200 parts of unsaturated polyoxyethylene ether, 80-100 parts of methyl acrylate, 10-30 parts of acrylic acid, 10-20 parts of oxidant, 1.5-2.5 parts of chain transfer agent, 10-20 parts of reducing agent, 3-5 parts of liquid alkali and 60-90 parts of deionized water;
the second component is prepared from the following raw materials in parts by weight: 5-10 parts of sodium lignosulphonate, 8-10 parts of diethanol monoisopropanolamine and 1-5 parts of starch hydrogel.
2. The polycarboxylic acid high-performance water reducing agent according to claim 1, wherein the starch hydrogel is prepared by the following method: weighing 20.0g of corn starch, preparing a starch emulsion with the solid content of 5-10% in a mixed solvent of deionized water and ethanol with the volume ratio of 5-10:1, heating the starch emulsion to 75 ℃ under the stirring condition, gelatinizing for 30-120 min, cooling to room temperature, and then placing in a refrigerator at 4 ℃ for 2-6 days to obtain the starch hydrogel.
3. The polycarboxylic acid-based high-performance water reducing agent as claimed in claim 1, wherein the unsaturated polyoxyethylene ether is isobutylene alcohol polyoxyethylene ether or prenol polyoxyethylene ether, and the average molecular weight is 2200-2400.
4. The polycarboxylic acid-based high-performance water reducing agent according to claim 1, wherein the oxidizing agent is one or more of hydrogen peroxide, ammonium persulfate and potassium persulfate.
5. The polycarboxylic acid-based high-performance water reducing agent according to claim 1, wherein the chain transfer agent is mercaptopropionic acid or mercaptoacetic acid.
6. The polycarboxylic acid-based high-performance water reducing agent according to claim 1, wherein the reducing agent is one or more of sodium hypophosphite, ascorbic acid and sodium bisulfite.
7. A preparation method of the polycarboxylic acid-based high-performance water reducing agent according to any one of claims 1 to 6, characterized by comprising the following steps:
1) preparing a solution A: mixing a reducing agent with 1/3 deionized water according to the proportion, and marking as material A;
2) preparing a material B: mixing a chain transfer agent, methyl acrylate and 1/3-dosage deionized water according to a proportion, and marking as material B;
3) adding unsaturated polyoxyethylene ether and 1/3-dose deionized water into a container, placing the container in a constant-temperature water bath kettle, setting the temperature of the water bath kettle to be 20-30 ℃, then adding acrylic acid into a backing material, starting stirring to dissolve a monomer, adding an oxidant, continuing stirring for 10min, then simultaneously beginning to dropwise add the solution A in the step (1) and the solution B in the step (2), wherein the dropwise adding time of the solution A is 3.5h, the dropwise adding time of the solution B is 3.0h, preserving heat for 1h after the dropwise adding is finished, then adjusting the pH value of the solution to 6 +/-1 by using 50% liquid alkali, and supplementing water to adjust the solid content to 40% to obtain a first component;
4) preparing starch hydrogel: weighing 20.0g of corn starch, preparing a starch emulsion with a solid content of 5-10% in a mixed solvent of deionized water and ethanol with a volume ratio of 5-10:1, heating the starch emulsion to 75 ℃ under stirring for gelatinization for 30-120 min, cooling to room temperature, and then placing in a refrigerator with the temperature of 4 ℃ for 2-6 days to obtain a starch hydrogel;
5) uniformly mixing sodium lignosulfonate, diethanol monoisopropanolamine and the starch hydrogel obtained in the step (4) in proportion to obtain a second component;
6) the first component and the second component are respectively packaged and then put in storage, and the first component and the second component are uniformly mixed for use.
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| CN113754839A (en) * | 2021-09-15 | 2021-12-07 | 广东瑞安科技实业有限公司 | Slow-release lignin-based polycarboxylic acid high-performance water reducing agent and preparation method thereof |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113754839A (en) * | 2021-09-15 | 2021-12-07 | 广东瑞安科技实业有限公司 | Slow-release lignin-based polycarboxylic acid high-performance water reducing agent and preparation method thereof |
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