CN113321440A - Modified lignosulfonate water reducing agent and preparation method thereof - Google Patents
Modified lignosulfonate water reducing agent and preparation method thereof Download PDFInfo
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- CN113321440A CN113321440A CN202110761052.0A CN202110761052A CN113321440A CN 113321440 A CN113321440 A CN 113321440A CN 202110761052 A CN202110761052 A CN 202110761052A CN 113321440 A CN113321440 A CN 113321440A
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- lignosulfonate
- water reducing
- reducing agent
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a modified lignosulfonate water reducing agent and a preparation method thereof, wherein the modified lignosulfonate water reducing agent comprises the following raw materials in parts by weight: 50-60 parts of lignosulfonate, 1-10 parts of isopropanol, 3-10 parts of acetone, 5-15 parts of sodium citrate, 5-10 parts of sodium hydroxide, 2-10 parts of hydrogen peroxide, 10-30 parts of sodium sulfate and 1-5 parts of maleic anhydride. The method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate; step two: adding hydrogen peroxide and sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature to be 80-85 ℃, adjusting the pH to be 8-9, and reacting for 2.2-2.5 h; step three: adding maleic anhydride, controlling the reaction temperature at 85 ℃ and the reaction time at 1.8-2 h; the water reducing rate of the water reducing agent is improved, and meanwhile, the compressive strength of the concrete is enhanced, so that the performance of the water reducing agent is obviously improved compared with that of the existing lignosulfonate water reducing agent.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a modified lignosulfonate water reducing agent and a preparation method thereof.
Background
Concrete is the most main building material in the building engineering nowadays, and the using amount of the concrete in the engineering is far higher than that of other materials, so that in order to improve the stability of the concrete and reduce the using amount of cement, a water reducing agent needs to be added into the concrete; the lignosulfonate water reducing agent is used as one of the water reducing agents, and has the advantages of low water reducing rate, general concrete compressive strength and lower use rate than other series of water reducing agents due to the unsatisfactory water reducing rate.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a modified lignosulfonate water reducing agent and a preparation method thereof.
Therefore, the invention provides a modified lignosulfonate water reducing agent which comprises the following raw materials in parts by weight: 50-60 parts of lignosulfonate, 1-10 parts of isopropanol, 3-10 parts of acetone, 5-15 parts of sodium citrate, 5-10 parts of sodium hydroxide, 2-10 parts of hydrogen peroxide, 10-30 parts of sodium sulfate and 1-5 parts of maleic anhydride.
Preferably, the feed comprises the following raw materials in parts by weight: 50 parts of lignosulfonate, 1 part of isopropanol, 3 parts of acetone, 5 parts of sodium citrate, 5 parts of sodium hydroxide, 2 parts of hydrogen peroxide, 10 parts of sodium sulfate and 1 part of maleic anhydride.
Preferably, the feed comprises the following raw materials in parts by weight: 55 parts of lignosulfonate, 5 parts of isopropanol, 6 parts of acetone, 10 parts of sodium citrate, 7 parts of sodium hydroxide, 8 parts of hydrogen peroxide, 20 parts of sodium sulfate and 3 parts of maleic anhydride.
Preferably, the feed comprises the following raw materials in parts by weight: 60 parts of lignosulfonate, 10 parts of isopropanol, 10 parts of acetone, 15 parts of sodium citrate, 10 parts of sodium hydroxide, 10 parts of hydrogen peroxide, 30 parts of sodium sulfate and 5 parts of maleic anhydride.
The invention also discloses a preparation method of the modified lignosulfonate water reducing agent, which comprises the following steps;
the method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate, and taking 50-60 parts for later use;
step two: adding 2-10 parts of hydrogen peroxide and 10-30 parts of sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature to be 80-85 ℃, adjusting the pH to be 8-9, and reacting for 2.2-2.5 h;
step three: adding 1-5 parts of maleic anhydride, controlling the reaction temperature at 80-85 ℃ and the reaction time at 1.8-2 h;
step four: sequentially adding 1-10 parts of isopropanol, 3-10 parts of acetone and 5-15 parts of sodium citrate, controlling the reaction temperature at 90-95 ℃, setting the reaction time to be 2 hours, setting the stirring speed to be 500-600r/min, and setting the stirring time to be 0.5 hour;
step five: and finally, adding 5-10 parts of sodium hydroxide, and adjusting the pH value to 8-9 to obtain a finished product of the water reducing agent.
The invention has the beneficial effects that: the invention provides a modified lignosulfonate water reducing agent and a preparation method thereof.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and is not to be construed as limiting the invention.
Example one
The embodiment discloses a modified lignosulfonate water reducing agent, which comprises the following raw materials in parts by weight: 50 parts of lignosulfonate, 1 part of isopropanol, 3 parts of acetone, 5 parts of sodium citrate, 5 parts of sodium hydroxide, 2 parts of hydrogen peroxide, 10 parts of sodium sulfate and 1 part of maleic anhydride.
A preparation method of a modified lignosulfonate water reducing agent comprises the following steps;
the method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate, and taking 50 parts for later use;
step two: adding 2 parts of hydrogen peroxide and 10 parts of sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature at 80 ℃, adjusting the pH value to 8, and reacting for 2.2 hours;
step three: adding 1 part of maleic anhydride, controlling the reaction temperature at 80 ℃ and the reaction time at 1.8 h;
step four: sequentially adding 1 part of isopropanol, 3 parts of acetone and 5 parts of sodium citrate, controlling the reaction temperature at 90 ℃, setting the reaction time to be 2 hours, setting the stirring speed to be 500r/min, and setting the stirring time to be 0.5 hour;
step five: and finally, adding 5 parts of sodium hydroxide, and adjusting the pH value to 8 to obtain a finished product of the water reducing agent.
Example two
The embodiment discloses a modified lignosulfonate water reducing agent, which comprises the following raw materials in parts by weight: 55 parts of lignosulfonate, 5 parts of isopropanol, 6 parts of acetone, 10 parts of sodium citrate, 7 parts of sodium hydroxide, 8 parts of hydrogen peroxide, 20 parts of sodium sulfate and 3 parts of maleic anhydride.
A preparation method of a modified lignosulfonate water reducing agent comprises the following steps;
the method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate, and taking 55 parts for later use;
step two: adding 5 parts of hydrogen peroxide and 8 parts of sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature to be 82 ℃, adjusting the pH value to be 8, and reacting for 2.3 hours;
step three: adding 3 parts of maleic anhydride, controlling the reaction temperature at 82 ℃ and the reaction time at 2 h;
step four: sequentially adding 5 parts of isopropanol, 6 parts of acetone and 10 parts of sodium citrate, controlling the reaction temperature at 90 ℃, setting the reaction time to be 2 hours, setting the stirring speed to be 600r/min and the stirring time to be 0.5 hour;
step five: and finally, adding 7 parts of sodium hydroxide, and adjusting the pH value to 9 to obtain a finished product of the water reducing agent.
EXAMPLE III
The embodiment discloses a modified lignosulfonate water reducing agent, which comprises the following raw materials in parts by weight: 60 parts of lignosulfonate, 10 parts of isopropanol, 10 parts of acetone, 15 parts of sodium citrate, 10 parts of sodium hydroxide, 10 parts of hydrogen peroxide, 30 parts of sodium sulfate and 5 parts of maleic anhydride.
A preparation method of a modified lignosulfonate water reducing agent comprises the following steps;
the method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate, and taking 60 parts for later use;
step two: adding 10 parts of hydrogen peroxide and 30 parts of sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature to be 85 ℃, adjusting the pH value to be 9, and reacting for 2.5 hours;
step three: adding 5 parts of maleic anhydride, controlling the reaction temperature at 85 ℃ and the reaction time at 2 h;
step four: sequentially adding 10 parts of isopropanol, 10 parts of acetone and 15 parts of sodium citrate, controlling the reaction temperature at 95 ℃, setting the reaction time to be 2 hours, setting the stirring speed to be 600r/min, and setting the stirring time to be 0.5 hour;
step five: and finally, adding 10 parts of sodium hydroxide, and adjusting the pH value to 9 to obtain a finished product of the water reducing agent.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The modified lignosulfonate water reducing agent is characterized by comprising the following raw materials in parts by weight: 50-60 parts of lignosulfonate, 1-10 parts of isopropanol, 3-10 parts of acetone, 5-15 parts of sodium citrate, 5-10 parts of sodium hydroxide, 2-10 parts of hydrogen peroxide, 10-30 parts of sodium sulfate and 1-5 parts of maleic anhydride.
2. The modified lignosulfonate water reducing agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 50 parts of lignosulfonate, 1 part of isopropanol, 3 parts of acetone, 5 parts of sodium citrate, 5 parts of sodium hydroxide, 2 parts of hydrogen peroxide, 10 parts of sodium sulfate and 1 part of maleic anhydride.
3. The modified lignosulfonate water reducing agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 55 parts of lignosulfonate, 5 parts of isopropanol, 6 parts of acetone, 10 parts of sodium citrate, 7 parts of sodium hydroxide, 8 parts of hydrogen peroxide, 20 parts of sodium sulfate and 3 parts of maleic anhydride.
4. The modified lignosulfonate water reducing agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 60 parts of lignosulfonate, 10 parts of isopropanol, 10 parts of acetone, 15 parts of sodium citrate, 10 parts of sodium hydroxide, 10 parts of hydrogen peroxide, 30 parts of sodium sulfate and 5 parts of maleic anhydride.
5. The method for preparing the modified lignosulfonate-type water reducing agent according to any one of claims 1 to 4, characterized by comprising the following steps;
the method comprises the following steps: preparing lignosulfonate, namely compounding sulfonated alkali lignin with defoaming agent dimethyl silicone oil, surfactant lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether to obtain modified lignosulfonate, and taking 50-60 parts for later use;
step two: adding 2-10 parts of hydrogen peroxide and 10-30 parts of sodium sulfate into the lignosulfonate obtained in the step one, controlling the reaction temperature to be 80-85 ℃, adjusting the pH to be 8-9, and reacting for 2.2-2.5 h;
step three: adding 1-5 parts of maleic anhydride, controlling the reaction temperature at 80-85 ℃ and the reaction time at 1.8-2 h;
step four: sequentially adding 1-10 parts of isopropanol, 3-10 parts of acetone and 5-15 parts of sodium citrate, controlling the reaction temperature at 90-95 ℃, setting the reaction time to be 2 hours, setting the stirring speed to be 500-600r/min, and setting the stirring time to be 0.5 hour;
step five: and finally, adding 5-10 parts of sodium hydroxide, and adjusting the pH value to 8-9 to obtain a finished product of the water reducing agent.
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