CN113929835A - Polycarboxylate superplasticizer for machine-made sand and preparation method thereof - Google Patents
Polycarboxylate superplasticizer for machine-made sand and preparation method thereof Download PDFInfo
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- CN113929835A CN113929835A CN202111281175.0A CN202111281175A CN113929835A CN 113929835 A CN113929835 A CN 113929835A CN 202111281175 A CN202111281175 A CN 202111281175A CN 113929835 A CN113929835 A CN 113929835A
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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
- C04B24/2605—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
-
- 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
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
-
- 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
Abstract
The invention discloses a polycarboxylate superplasticizer for machine-made sand and a preparation method thereof, wherein the polycarboxylate superplasticizer comprises isopentenyl polyoxyethylene ether, an oxidant, a first solvent, a first addition component, a second addition component and an addition solution; the first additive component comprises acrylic acid, mercaptopropionic acid and a second solvent; the second additive component comprises a reducing agent and a third solvent; the additive solution is 30% sodium hydroxide aqueous solution. The problems of poor workability, large loss of flow over time and easy bleeding and segregation of the machine-made sand concrete can be solved, the workability and the constructability of the machine-made sand concrete are obviously improved, the water consumption is reduced, and the solidification quality of the machine-made sand concrete is improved.
Description
Technical Field
The invention relates to a polycarboxylate superplasticizer for machine-made sand and a preparation method thereof, belonging to the technical field of concrete construction auxiliary raw materials.
Background
Along with the high-speed development of national economy, the building market of China is like bamboo shoots in spring after rain, high buildings and mansions are raised on the ground, the building market is a prosperous scene everywhere, however, a huge building market inevitably needs a huge amount of building materials for supporting, at present when the building market is rapidly developed, natural building materials are gradually depleted, along with the national construction of an environment-friendly society and the requirement of construction of green water in Qingshan mountains, the exploitation of natural resources is greatly restricted, in order to ensure sufficient market supply, new building materials are inevitably needed for supplement and application, and thus, a new building material, namely machine-made sand (artificial sand) appears. The machine-made sand is prepared by mechanically crushing rocks, and the concrete has a plurality of defects in actual use, such as prominent edges and corners, high stone powder content, high water demand, high slump loss and poor fluidity of machine-made sand concrete.
Aiming at the problems of poor workability, large loss of flow over time, easy bleeding, segregation and the like of machine-made sand concrete, the invention provides a polycarboxylic acid water reducing agent.
Disclosure of Invention
The invention aims to: a method for producing a polycarboxylic acid water reducing agent for machine-made sand is provided, which can solve at least some of the above problems and improve workability and workability of machine-made sand concrete.
The technical scheme of the invention is as follows: a polycarboxylate superplasticizer for machine-made sand comprises isopentenyl polyoxyethylene ether, an oxidant, a first solvent, a first addition component, a second addition component and an addition solution;
the first additive component comprises acrylic acid, mercaptopropionic acid and a second solvent;
the second additive component comprises a reducing agent and a third solvent;
the additive solution is 30% sodium hydroxide aqueous solution.
Further, the oxidant is ammonium persulfate.
Further, the reducing agent is vitamin C.
Further, the molecular weight of the isopentenyl polyoxyethylene ether is 2400, 1200 or 600.
Further, the first solvent and the second solvent are both soft water, and the third solvent is water or soft water.
The invention also relates to a preparation method of the polycarboxylate superplasticizer for machine-made sand, which comprises the following steps:
s1, adding soft water, isopentenyl polyoxyethylene ether and ammonium persulfate into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, and then stirring and heating to 25 ℃;
s2, simultaneously dripping a first addition component and a second addition component through a dripping device, wherein the first addition component is uniformly dripped after 3 hours, and the second addition component is uniformly dripped after 3.5 hours;
s3, after the second addition component is added dropwise, curing is carried out for 1.5 hours, then 30% of sodium hydroxide aqueous solution is added, and water is replenished to make the solid content reach 40%, so that the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
Further, 200 g of soft water, 365 g of isopentenyl polyoxyethylene ether, 1.8 g of ammonium persulfate, 196.5 g of the first component, 100.7 g of the second component and 50 g of a sodium hydroxide aqueous solution are used as the polycarboxylate superplasticizer for the machine-made sand, and the balance is water with the solid content of 40%;
the first additional component included 45 grams of acrylic acid, 1.5 grams of mercaptopropionic acid, and 150 grams of soft water, and the second additional component included 0.7 grams of vitamin C and 100 grams of water.
The invention has the advantages that: the polycarboxylate water reducer for machine-made sand prepared by the preparation method of the polycarboxylate water reducer for machine-made sand can overcome the problems of poor workability, large loss during flowing and easy bleeding and segregation of machine-made sand concrete, obviously improve the workability and the constructability of the machine-made sand concrete, reduce the water consumption and improve the solidification quality of the machine-made sand concrete.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.
The polycarboxylate superplasticizer for machine-made sand comprises isopentenyl polyoxyethylene ether, an oxidant, a first solvent, a first addition component, a second addition component and an addition solution;
the first additive component comprises acrylic acid, mercaptopropionic acid and a second solvent;
the second additive component comprises a reducing agent and a third solvent;
the additive solution is 30% sodium hydroxide aqueous solution.
In order to illustrate the function of the polycarboxylate water reducer for machine-made sand prepared by the preparation method of the polycarboxylate water reducer for machine-made sand in the machine-made sand concrete, the following examples and comparative examples are provided, wherein the mixing ratio of the components in the comparative examples and the comparative examples is as follows: 42.5 raisin cement: 380 parts; and (3) machining sand: 490 parts; facing sand: 320 parts of (a); 1-2 stones: 750 parts; melon seed slices: 300 parts of water: 120 parts of water reducing agent: 10-15 parts.
Comparative example 1
200 g of soft water, 365 g of isopentenyl polyoxyethylene ether 2400 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then first adding components (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and second adding components (0.7 g of vitamin C and 100 g of water) are dropped simultaneously, the first adding components are uniform and are dropped for 3 hours, the second adding components are uniform and are dropped for 3.5 hours, after the second adding components are dropped, the mixture is cured for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, the solid content is enabled to be 40%, and the polycarboxylic acid water reducer for machine-made sand is obtained.
Example one
200 g of soft water, 182.5 g of isopentenyl polyoxyethylene ether 2400, 182.5 g of isopentenyl polyoxyethylene ether 1200 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then a first addition component (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and a second addition component (0.7 g of vitamin C and 100 g of water) are simultaneously dropped, the first addition component is uniform and completely dropped within 3 hours, the second addition component is uniform and completely dropped within 3.5 hours, after the second addition component is completely dropped, the mixture is aged for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, and the solid content is enabled to be 40%, so that the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
Example two
200 g of soft water, 182.5 g of isopentenyl polyoxyethylene ether 2400, 91.25 g of isopentenyl polyoxyethylene ether 1200, 91.25 g of isopentenyl polyoxyethylene ether 600 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then first adding components (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and second adding components (0.7 g of vitamin C and 100 g of water) are simultaneously dropped into the mixture, the first adding components are uniform and are dropped within 3 hours, the second adding components are uniform and are dropped within 3.5 hours, after the second adding components are dropped, the mixture is aged for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, and water is replenished to ensure that the solid content is 40%, thus obtaining the polycarboxylic acid water reducer for the machine-made sand.
EXAMPLE III
200 g of soft water, 182.5 g of isopentenyl polyoxyethylene ether 2400, 182.5 g of isopentenyl polyoxyethylene ether 600 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then a first addition component (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and a second addition component (0.7 g of vitamin C and 100 g of water) are simultaneously dropped, the first addition component is uniform and completely dropped within 3 hours, the second addition component is uniform and completely dropped within 3.5 hours, after the second addition component is completely dropped, the mixture is aged for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, and the solid content is enabled to be 40%, so that the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
Example four
200 g of soft water, 182.5 g of isopentenyl polyoxyethylene ether 1200, 182.5 g of isopentenyl polyoxyethylene ether 600 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then a first addition component (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and a second addition component (0.7 g of vitamin C and 100 g of water) are simultaneously dropped, the first addition component is uniform and completely dropped within 3 hours, the second addition component is uniform and completely dropped within 3.5 hours, after the second addition component is completely dropped, the mixture is aged for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, and the solid content is enabled to be 40%, so that the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
EXAMPLE five
200 g of soft water, 365 g of isopentenyl polyoxyethylene ether 600 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then first adding components (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and second adding components (0.7 g of vitamin C and 100 g of water) are dropped simultaneously, the first adding components are uniform and are dropped for 3 hours, the second adding components are uniform and are dropped for 3.5 hours, after the second adding components are dropped, the mixture is cured for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, the solid content is enabled to be 40%, and the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
EXAMPLE six
200 g of soft water, 365 g of isopentenyl polyoxyethylene ether 1200 and 1.8 g of ammonium persulfate are added into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, then the mixture is stirred and heated to 25 ℃, then first adding components (45 g of acrylic acid, 1.5 g of mercaptopropionic acid and 150 g of soft water) and second adding components (0.7 g of vitamin C and 100 g of water) are dropped simultaneously, the first adding components are uniform and are dropped for 3 hours, the second adding components are uniform and are dropped for 3.5 hours, after the second adding components are dropped, the mixture is cured for 1.5 hours, then 50 g of 30% sodium hydroxide aqueous solution is added, water is supplemented, the solid content is enabled to be 40%, and the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
The following list of the application cases of the polycarboxylic acid water reducing agent for machine-made sand prepared in the above comparative examples and examples is as follows:
| examples | Initial slump, spread/mm | Fresh concrete state |
| Comparative example 1 | 205/530*540 | Loose, bleeding, bottom scraping and 1 hour loss |
| Example one | 215/550*560 | Soft, lightly raking the bottom, and losing 1.5 hours |
| Example two | 220/540*560 | Soft, no bleeding, no bottom scraping, good wrapping, fast flow speed, no loss in 2 hours |
| EXAMPLE III | 210/550*560 | Soft, no bleeding, no bottom scraping, good wrapping, fast flow speed, no loss in 2 hours |
| Example four | 220/550*560 | Has more and soft bubbles, does not bleed water, is wrapped well and does not lose in 2 hours |
| EXAMPLE five | 220/520*530 | A plurality of bubbles, softness, no bleeding and bottom scraping,Good wrapping, low flow rate and no loss in 2 hours |
| EXAMPLE six | 210/550*530 | Has more bubbles, is soft, does not bleed water, takes off the bottom, is well wrapped, has slow flow rate and does not lose in 2 hours |
By combining a comparative example and an embodiment, the polycarboxylate water reducer for machine-made sand prepared by the preparation method of the polycarboxylate water reducer for machine-made sand can be obviously seen to be applied to the construction of machine-made sand concrete, so that the workability and the constructability of the machine-made sand concrete can be obviously improved, and the dosage of macromolecular isopentenyl polyoxyethylene ether cannot be too high, for example, 365 g of isopentenyl polyoxyethylene ether 2400 adopted in the comparative example 1 causes the machine-made sand concrete to disperse, bleed, scrape the bottom and lose quickly; in example 1, 182.5 g of isopentenyl polyoxyethylene ether 2400 and 91.25 g of isopentenyl polyoxyethylene ether 1200 are adopted, so that the machine-made sand concrete is slightly bottomed and has a higher loss speed.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A polycarboxylate superplasticizer for machine-made sand is characterized by comprising isopentenyl polyoxyethylene ether, an oxidant, a first solvent, a first addition component, a second addition component and an addition solution;
the first additive component comprises acrylic acid, mercaptopropionic acid and a second solvent;
the second additive component comprises a reducing agent and a third solvent;
the additive solution is 30% sodium hydroxide aqueous solution.
2. The polycarboxylate water reducer for machine-made sand of claim 1, wherein the oxidant is ammonium persulfate.
3. The polycarboxylic acid water reducing agent for machine-made sand according to claim 1, wherein the reducing agent is vitamin C.
4. The polycarboxylate water reducer for machine-made sand of claim 1, wherein the molecular weight of the isopentenyl polyoxyethylene ether is 2400, 1200 or 600.
5. The polycarboxylate water reducer for machine-made sand of claim 1, wherein the first solvent and the second solvent are both soft water, and the third solvent is water or soft water.
6. A preparation method of a polycarboxylate water reducer for machine-made sand is used for preparing the polycarboxylate water reducer for machine-made sand according to any one of claims 1 to 5, and is characterized by comprising the following steps:
s1, adding soft water, isopentenyl polyoxyethylene ether and ammonium persulfate into a four-neck flask provided with a thermometer, a speed-regulating stirrer, a reflux condenser and a dropping device, and then stirring and heating to 25 ℃;
s2, simultaneously dripping a first addition component and a second addition component through a dripping device, wherein the first addition component is uniformly dripped after 3 hours, and the second addition component is uniformly dripped after 3.5 hours;
s3, after the second addition component is added dropwise, curing is carried out for 1.5 hours, then 30% of sodium hydroxide aqueous solution is added, and water is replenished to make the solid content reach 40%, so that the polycarboxylic acid water reducing agent for the machine-made sand is obtained.
7. The preparation method of the polycarboxylate superplasticizer for machine-made sand according to claim 6, which is characterized by comprising the following steps: 200 g of soft water, 365 g of isopentenyl polyoxyethylene ether, 1.8 g of ammonium persulfate, 196.5 g of a first component, 100.7 g of a second component and 50 g of a sodium hydroxide aqueous solution, wherein the balance is water, and the solid content is 40%;
the first additional component included 45 grams of acrylic acid, 1.5 grams of mercaptopropionic acid, and 150 grams of soft water, and the second additional component included 0.7 grams of vitamin C and 100 grams of water.
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| CN202111281175.0A CN113929835A (en) | 2021-11-01 | 2021-11-01 | Polycarboxylate superplasticizer for machine-made sand and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928114A (en) * | 2010-08-30 | 2010-12-29 | 大连建科北方化学有限公司 | High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof |
| CN105801765A (en) * | 2016-03-01 | 2016-07-27 | 四川同舟化工科技有限公司 | Preparation method of anti-segregation type polycarboxylic acid water reducer of concrete |
| CN110358026A (en) * | 2019-08-20 | 2019-10-22 | 武汉奥克化学有限公司 | A kind of viscosity reduction type polycarboxylate water-reducer and preparation method thereof |
| CN111072870A (en) * | 2019-12-31 | 2020-04-28 | 广东奥克化学有限公司 | High-adaptability polycarboxylate superplasticizer and preparation method thereof |
| CN113429526A (en) * | 2021-04-28 | 2021-09-24 | 江苏万邦新材料科技有限公司 | Powder polycarboxylate superplasticizer for dry-mixed mortar |
-
2021
- 2021-11-01 CN CN202111281175.0A patent/CN113929835A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928114A (en) * | 2010-08-30 | 2010-12-29 | 大连建科北方化学有限公司 | High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof |
| CN105801765A (en) * | 2016-03-01 | 2016-07-27 | 四川同舟化工科技有限公司 | Preparation method of anti-segregation type polycarboxylic acid water reducer of concrete |
| CN110358026A (en) * | 2019-08-20 | 2019-10-22 | 武汉奥克化学有限公司 | A kind of viscosity reduction type polycarboxylate water-reducer and preparation method thereof |
| CN111072870A (en) * | 2019-12-31 | 2020-04-28 | 广东奥克化学有限公司 | High-adaptability polycarboxylate superplasticizer and preparation method thereof |
| CN113429526A (en) * | 2021-04-28 | 2021-09-24 | 江苏万邦新材料科技有限公司 | Powder polycarboxylate superplasticizer for dry-mixed mortar |
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