CN111675777A - Concrete compaction reinforcing agent and preparation method thereof - Google Patents
Concrete compaction reinforcing agent and preparation method thereof Download PDFInfo
- Publication number
- CN111675777A CN111675777A CN202010647303.8A CN202010647303A CN111675777A CN 111675777 A CN111675777 A CN 111675777A CN 202010647303 A CN202010647303 A CN 202010647303A CN 111675777 A CN111675777 A CN 111675777A
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- Prior art keywords
- concrete
- chain transfer
- parts
- transfer agent
- adjusting
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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
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/04—Acids; Metal salts or ammonium salts thereof
- C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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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
- C04B24/2641—Polyacrylates; Polymethacrylates
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to a concrete compaction reinforcing agent and a preparation method thereof. A concrete compaction reinforcing agent comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator. The concrete can effectively improve the crack resistance and the compactness of the concrete. The preparation method of the concrete compaction reinforcing agent comprises the following steps: diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃; polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate; adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0. The preparation process is simple, and the prepared concrete compaction reinforcing agent has better effect.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a concrete compaction reinforcing agent and a preparation method thereof.
Background
The main tasks of hydraulic concrete buildings are water retaining, water diversion, water conveying and water drainage, which are closely related to 'water', and water is non-porous and non-permeable, especially pressure water. Therefore, leakage is one of the major diseases common to hydraulic concrete buildings.
Cracks are common diseases of hydraulic concrete buildings, and the control of the concrete cracks is the key for improving the water resistance of a concrete structure. The C30 concrete has 0.1mm penetrating crack, the permeability coefficient in the crack is 108 times of that of the matrix, and water can penetrate through the concrete with the thickness of 1m only within about 2min under the high water pressure of 1 m. The concrete cracks, the thickness of the protective layer of the concrete structure is reduced, the transmission of aggressive media, air and moisture to the interior of the concrete structure is accelerated, the activation corrosion time of the reinforcing steel bars in the concrete structure is shortened, and the service life of the concrete structure is shortened.
Therefore, improving workability, compactness and crack resistance of concrete is the key to improving durability of concrete. Most of products and related inventions in the market focus on the aspects of seepage resistance, freezing resistance, steel bar corrosion resistance, chloride ion permeation resistance and sulfate corrosion resistance, and almost do not pay attention to crack resistance and workability.
Disclosure of Invention
The invention aims to provide a concrete compaction reinforcing agent which can effectively improve the cracking resistance and the compactness of concrete.
The invention also aims to provide a preparation method of the concrete compaction reinforcing agent, which has simple preparation process and better effect.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a concrete compaction reinforcing agent which comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.
Further, in some embodiments of the present invention, the acrylic acid is monomeric acrylic acid.
Further, in some embodiments of the present invention, the water is deionized water.
Further, in some embodiments of the present invention, the chain transfer agent is sodium phosphate.
Further, in some embodiments of the present invention, the initiator is one of sodium persulfate or ammonium persulfate.
The invention provides a preparation method of the concrete compaction reinforcing agent, which comprises the following steps:
diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃;
polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate;
adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.
Further, in some embodiments of the invention, the sodium polyacrylate has a molecular weight of 1200-1600.
Further, in some embodiments of the present invention, the NaOH is 30% NaOH by mass.
The invention provides a concrete compaction reinforcing agent and a preparation method thereof, and the concrete compaction reinforcing agent at least has the following beneficial effects:
acrylic acid is used as a main raw material to obtain polyacrylic acid, so that the workability, compactness and cracking resistance of concrete can be effectively improved, and the service life of concrete is effectively prolonged.
The preparation method is simple, and the prepared concrete compaction reinforcing agent has better effect after the pH is adjusted to 8.0-9.0.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a concrete compaction reinforcing agent which comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.
In the embodiment, the polyacrylic acid is obtained by adopting the acrylic acid as a main raw material, so that the workability, compactness and cracking resistance of the concrete can be effectively improved, and the service life of the concrete can be effectively prolonged.
Further, in some embodiments of the present invention, the acrylic acid is monomeric acrylic acid.
Further, in some embodiments of the present invention, the water is deionized water.
Further, in some embodiments of the present invention, the chain transfer agent is sodium phosphate.
Further, in some embodiments of the present invention, the initiator is one of sodium persulfate or ammonium persulfate.
The invention provides a preparation method of the concrete compaction reinforcing agent, which comprises the following steps: diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃; polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate; adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.
The preparation method is simple, and the prepared concrete compaction reinforcing agent has better effect after the pH is adjusted to 8.0-9.0.
Further, in some embodiments of the invention, the sodium polyacrylate has a molecular weight of 1200-1600.
Further, in some embodiments of the present invention, the NaOH is 30% NaOH by mass.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Diluting a chain transfer agent: adding 34kg of chain transfer agent into 100kg of water, and heating to 82 ℃;
polymerization reaction: mixing 170kg of monomer acrylic acid and 14kg of ammonium persulfate, adding a diluted chain transfer agent, and stirring for reacting for 3 hours to obtain sodium polyacrylate, wherein the molecular weight of the sodium polyacrylate is 1500;
adjusting the pH value: after the polymerization reaction is finished, cooling to 40 ℃, adjusting the pH of the sodium polyacrylate by adopting NaOH with the mass concentration of 30% and adjusting the pH to 8.0.
Example 2
Transfer agent dilution: adding 33g of chain transfer agent into 100g of water, and heating to 55 ℃;
polymerization reaction: mixing 50g of monomer acrylic acid and 5g of sodium persulfate, adding a diluted chain transfer agent, stirring and reacting for 3.2 hours to obtain sodium polyacrylate, wherein the molecular weight of the sodium polyacrylate is 1500;
adjusting the pH value: after the polymerization reaction is finished, cooling to 40 ℃, adjusting the pH of the sodium polyacrylate by adopting NaOH with the mass concentration of 30% and adjusting the pH to 9.0.
Example 3
Transfer agent dilution: adding 165g of chain transfer agent to 100g of water and heating to 55 ℃;
polymerization reaction: mixing 250g of monomer acrylic acid and 25g of sodium persulfate, adding a diluted chain transfer agent, and stirring for reacting for 2.8 hours to obtain sodium polyacrylate, wherein the molecular weight of the sodium polyacrylate is 1400;
adjusting the pH value: after the polymerization reaction is finished, cooling to 40 ℃, adjusting the pH of the sodium polyacrylate by adopting NaOH with the mass concentration of 30% and adjusting the pH to 9.0.
In summary, the invention provides a concrete compaction reinforcing agent and a preparation method thereof, and the concrete compaction reinforcing agent at least has the following beneficial effects:
acrylic acid is used as a main raw material to obtain polyacrylic acid, so that the workability, compactness and cracking resistance of concrete can be effectively improved, and the service life of concrete is effectively prolonged.
The preparation method is simple, and the prepared concrete compaction reinforcing agent has better effect after the pH is adjusted to 8.0-9.0.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. A concrete compaction reinforcing agent is characterized in that: the paint comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.
2. A concrete compaction enhancer according to claim 1, wherein: the acrylic acid is monomer acrylic acid.
3. A concrete compaction enhancer according to claim 1, wherein: the water is deionized water.
4. A concrete compaction enhancer according to claim 1, wherein: the chain transfer agent is sodium phosphate.
5. A concrete compaction enhancer according to claim 1, wherein: the initiator is one of sodium persulfate or ammonium persulfate.
6. A method of producing a concrete reinforcing compaction agent according to any one of claims 1 to 5, wherein: the method comprises the following steps:
diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃;
polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate;
adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.
7. The method of claim 6, wherein: the molecular weight of the sodium polyacrylate is 1200-1600.
8. The method of claim 6, wherein: the NaOH is 30% NaOH by mass concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010647303.8A CN111675777A (en) | 2020-07-07 | 2020-07-07 | Concrete compaction reinforcing agent and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010647303.8A CN111675777A (en) | 2020-07-07 | 2020-07-07 | Concrete compaction reinforcing agent and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111675777A true CN111675777A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010647303.8A Pending CN111675777A (en) | 2020-07-07 | 2020-07-07 | Concrete compaction reinforcing agent and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000233957A (en) * | 1999-02-15 | 2000-08-29 | Nmb:Kk | Cement additive |
| CN102358763A (en) * | 2011-07-21 | 2012-02-22 | 北京工业大学 | Method for preparing additive for inhibiting side effect of clay |
| CN102863573A (en) * | 2012-10-23 | 2013-01-09 | 四川花语精细化工有限公司 | Preparation method of sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution |
| CN105884243A (en) * | 2014-09-03 | 2016-08-24 | 安徽皖科新科技发展有限公司 | Concrete enhancer and preparation and application method thereof |
| CN108602901A (en) * | 2016-02-04 | 2018-09-28 | 巴斯夫欧洲公司 | The method for preparing acrylate copolymer |
-
2020
- 2020-07-07 CN CN202010647303.8A patent/CN111675777A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000233957A (en) * | 1999-02-15 | 2000-08-29 | Nmb:Kk | Cement additive |
| CN102358763A (en) * | 2011-07-21 | 2012-02-22 | 北京工业大学 | Method for preparing additive for inhibiting side effect of clay |
| CN102863573A (en) * | 2012-10-23 | 2013-01-09 | 四川花语精细化工有限公司 | Preparation method of sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution |
| CN105884243A (en) * | 2014-09-03 | 2016-08-24 | 安徽皖科新科技发展有限公司 | Concrete enhancer and preparation and application method thereof |
| CN108602901A (en) * | 2016-02-04 | 2018-09-28 | 巴斯夫欧洲公司 | The method for preparing acrylate copolymer |
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Application publication date: 20200918 |