CN113788640B - Method for treating residual polymer of aliphatic water reducing agent - Google Patents
Method for treating residual polymer of aliphatic water reducing agent Download PDFInfo
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- CN113788640B CN113788640B CN202111209305.XA CN202111209305A CN113788640B CN 113788640 B CN113788640 B CN 113788640B CN 202111209305 A CN202111209305 A CN 202111209305A CN 113788640 B CN113788640 B CN 113788640B
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- reducing agent
- water reducing
- aliphatic water
- residual polymer
- polymer
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a method for treating a residual polymer of an aliphatic water reducing agent, which comprises the following steps: drying, crushing and grinding the residual polymer of the aliphatic water reducing agent to obtain granular residual polymer of the aliphatic water reducing agent, screening the ground residual polymer of the aliphatic water reducing agent, and selecting the granular residual polymer of the aliphatic water reducing agent with the grain diameter of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent; and mechanically mixing the residual aliphatic water reducer polymer powder with the synergist, the plasticizer and the air entraining agent until the mixture is uniform, and preparing the anti-segregation agent. The method for treating the residual polymer of the aliphatic water reducing agent solves the problem of long-term stacking of the residual polymer of the aliphatic water reducing agent, and simultaneously converts the residual polymer of the aliphatic water reducing agent into a new additive product.
Description
Technical Field
The invention relates to the technical field of building material chemical industry, in particular to a method for treating residual polymers of an aliphatic water reducing agent.
Background
The aliphatic water reducing agent has the characteristics of wide raw material sources, simple production process, high water reducing rate, good adaptability to cement and the like, and is widely applied in the production process of concrete. The production abnormality of the aliphatic water reducing agent and the condensation reaction during the storage of the aliphatic water reducing agent can generate the residual polymer of the aliphatic water reducing agent.
For the residual polymer of the aliphatic water reducing agent, no effective and feasible treatment means exists at present, and the residual polymer of the aliphatic water reducing agent can only be temporarily subjected to extensive stacking treatment.
Because the residual polymer of the aliphatic water reducing agent is insoluble in water, the polymer cannot be directly recycled and applied to the production of the aliphatic water reducing agent. The long-term extensive stacking disposal of the residual polymer of the aliphatic water reducing agent causes environmental pollution, so a reasonable and effective treatment method for the residual polymer of the aliphatic water reducing agent is urgently needed to be found.
Disclosure of Invention
Based on the method, the problem of long-term stacking of the residual polymer of the aliphatic water reducing agent is solved, and the residual polymer of the aliphatic water reducing agent is converted into a new additive product.
A method for treating residual polymer of aliphatic water reducing agent comprises the following steps:
drying, crushing and grinding the residual polymer of the aliphatic water reducing agent to obtain a granular residual polymer of the aliphatic water reducing agent;
sieving the residual polymer of the milled aliphatic water reducing agent, and selecting the residual polymer of the aliphatic water reducing agent with the particle size of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent;
mechanically mixing the residual aliphatic water reducer polymer powder with a synergist, a plasticizer and an air entraining agent until the mixture is uniform, and preparing to obtain an anti-segregation agent;
the mass ratio of the residual aliphatic water reducing agent polymer powder to the synergist to the plasticizer to the air entraining agent is (70-80): (20 to 30): (0.5-1): (0.5-1).
Preferably, an anti-caking agent is added in the grinding process of the aliphatic water reducing agent polymer.
Preferably, 20-30% of an anti-caking agent is added according to the mass percentage of the residual polymer of the aliphatic water reducing agent in the grinding process.
Preferably, the anti-caking agent comprises at least one of fly ash, mineral powder, silica fume and limestone powder.
Preferably, the synergist comprises at least one of calcium hydroxide, sodium sulfate, sodium carbonate and sodium silicate.
Preferably, the plasticizer includes at least one of hydroxypropyl methylcellulose, hydroxymethyl cellulose, and methylcellulose.
Preferably, the air entraining agent comprises at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and triterpenoid saponin.
Preferably, the drying mode is natural air drying or low-temperature drying.
Preferably, the crushing means comprises jaw crushing.
Preferably, the milling means comprises ball milling.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of drying, crushing and grinding the residual polymer of the aliphatic water reducing agent, screening residual polymer powder of the aliphatic water reducing agent with the particle size of less than 45 mu m, and mechanically mixing the residual polymer powder of the aliphatic water reducing agent with a synergist, a plasticizer and an air entraining agent to prepare the anti-segregation agent.
The residual aliphatic water reducing agent polymer powder with the particle size less than 45 mu m in the segregation resistance agent can quickly reduce the dispersion performance and the dispersion retention performance of the polycarboxylic acid water reducing agent, plays a role in segregation resistance and solves the problems of concrete segregation, bleeding and the like.
The synergist, the plasticizer and the air entraining agent are added into the anti-segregation agent, because the synergist can ensure the setting time and the strength of the concrete, the plasticizer can improve the plasticity of the concrete, and the air entraining agent can improve the workability of the concrete, the addition of the anti-segregation agent can not influence the setting time and the strength of the concrete in each age.
The method for treating the residual polymer of the aliphatic water reducing agent solves the problem of long-term stacking of the residual polymer, and simultaneously converts the residual polymer into the anti-segregation agent, thereby creating economic value.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials and reagents used in the following examples, etc., are commercially available unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it is necessary to be able to be realized by those skilled in the art, and when the technical solutions are combined, they are contradictory or unrealistic.
The invention provides a method for treating residual polymer of an aliphatic water reducing agent, which comprises the following steps:
drying, crushing and grinding the residual polymer of the aliphatic water reducing agent to obtain granular residual polymer of the aliphatic water reducing agent;
selecting a granular aliphatic water reducing agent residual polymer with the grain diameter less than 45 mu m as a residual aliphatic water reducing agent polymer powder;
screening the residual polymer of the milled aliphatic water reducing agent, and mechanically mixing the residual polymer powder of the aliphatic water reducing agent with the synergist, the plasticizer and the air entraining agent until the mixture is uniform to prepare the anti-segregation agent;
the mass ratio of the residual aliphatic water reducing agent polymer powder, the synergist, the plasticizer and the air entraining agent is (70-80): (20 to 30): (0.5-1): (0.5-1).
The method comprises the steps of drying, crushing and grinding the residual polymer of the aliphatic water reducing agent, screening residual polymer powder of the aliphatic water reducing agent with the particle size of less than 45 mu m, and mechanically mixing the residual polymer powder of the aliphatic water reducing agent with a synergist, a plasticizer and an air entraining agent to prepare the anti-segregation agent.
The residual aliphatic water reducing agent polymer powder with the grain diameter less than 45 mu m in the anti-segregation agent can reduce the dispersion performance and the dispersion retention performance of the polycarboxylic acid water reducing agent, has the anti-segregation effect, and solves the problems of concrete segregation, bleeding and the like.
The synergist, the plasticizer and the air entraining agent are added into the anti-segregation agent, because the synergist can ensure the setting time and the strength of the concrete, the plasticizer can improve the plasticity of the concrete, and the air entraining agent can improve the workability of the concrete, the addition of the anti-segregation agent can not influence the setting time and the strength of the concrete in each age. The dosage of the plasticizer and the air entraining agent is not too much, otherwise, the strength of the concrete is influenced, and the dosage of the plasticizer and the air entraining agent is too little, so that the concrete cannot normally play a role. The strength of the concrete is stimulated too early due to excessive consumption of the synergist, so that the later strength of the concrete is not increased or shrunk, and the synergist cannot normally play a role if the consumption of the synergist is too small.
The method for treating the residual polymer of the aliphatic water reducing agent solves the problem of long-term stacking of the residual polymer, and simultaneously converts the residual polymer into the anti-segregation agent, thereby creating economic value.
Specifically, the residual aliphatic water reducer polymer powder, the synergist, the plasticizer and the air entraining agent are mechanically mixed without chemical reaction.
In some embodiments, an anti-caking agent is added during the milling of the aliphatic water-reducing agent polymer to prevent caking of residual aliphatic water-reducing agent polymer powder during the milling process.
In some embodiments, 20% to 30% of an anticaking agent is added as a percentage by mass of the aliphatic water-reducing agent residual polymer.
The residual polymer of the aliphatic water reducing agent is easy to generate cohesive agglomeration due to high temperature in the grinding process, the cohesive agglomeration phenomenon can be effectively improved by adding the anti-caking agent, and the workability of concrete can also be improved by a certain amount of the anti-caking agents such as the fly ash, the mineral powder, the silica fume, the limestone powder and the like.
In some embodiments, the anti-caking agent comprises at least one of fly ash, mineral fines, silica fume, and limestone fines.
In some embodiments, the synergist comprises at least one of calcium hydroxide, sodium sulfate, sodium carbonate, and sodium silicate.
The synergist can excite the activity of mineral admixtures such as fly ash, mineral powder and the like in the concrete, thereby ensuring the setting time and strength of the concrete.
In some embodiments, the plasticizer comprises at least one of hydroxypropyl methylcellulose, hydroxymethyl cellulose, and methylcellulose.
The plasticizer can improve the water retention of the concrete and improve the plasticity of the concrete.
In some embodiments, the air entraining agent comprises at least one of sodium lauryl sulfate, sodium dodecylbenzene sulfonate, and a triterpene saponin.
The air entraining agent can generate a proper amount of tiny uniform bubbles in the stirring process, and can improve the workability of concrete.
In some embodiments, the drying is natural air drying or low temperature drying.
In some embodiments, the crushing means comprises jaw crushing.
In some embodiments, the milling means comprises ball milling.
Example 1
And (3) carrying out natural air drying treatment on the residual polymer of the aliphatic water reducing agent.
Carrying out jaw crushing and ball milling on the dried aliphatic water reducing agent residual polymer to obtain a granular aliphatic water reducing agent residual polymer, and adding 30% of fly ash in the grinding process according to the mass percentage of the dried aliphatic water reducing agent residual polymer;
sieving the residual polymer of the milled aliphatic water reducing agent, and selecting the residual polymer of the granular aliphatic water reducing agent with the particle size of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent;
according to the mass percent, 75 percent of residual aliphatic water reducing agent polymer powder, 19 percent of sodium silicate, 5 percent of sodium sulfate, 0.5 percent of methyl cellulose and 0.5 percent of lauryl sodium sulfate are mechanically mixed until the mixture is uniform, and the anti-segregation agent is prepared.
Example 2
And (3) carrying out natural air drying treatment on the residual polymer of the aliphatic water reducing agent.
Carrying out jaw crushing and ball milling on the dried aliphatic water reducing agent residual polymer to obtain a granular aliphatic water reducing agent residual polymer, and adding 20% of mineral powder according to the mass percentage of the dried aliphatic water reducing agent residual polymer in the grinding process;
sieving the residual polymer of the milled aliphatic water reducing agent, and selecting the residual polymer of the granular aliphatic water reducing agent with the particle size of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent;
according to the mass percentage, 75% of residual aliphatic water reducing agent polymer powder, 19% of sodium silicate, 5% of sodium carbonate, 0.5% of hydroxypropyl methyl cellulose and 0.5% of lauryl sodium sulfate are mechanically mixed until uniform, and the anti-segregation agent is prepared.
Example 3
And drying the residual polymer of the aliphatic water reducing agent at low temperature.
Carrying out jaw crushing and ball milling on the dried aliphatic water reducing agent residual polymer to obtain a granular aliphatic water reducing agent residual polymer, and adding 30% of limestone powder according to the mass percentage of the dried aliphatic water reducing agent residual polymer in the grinding process;
sieving the residual polymer of the milled aliphatic water reducing agent, and selecting the residual polymer of the granular aliphatic water reducing agent with the particle size of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent;
according to the mass percentage, 70 percent of residual aliphatic water reducing agent polymer powder, 28 percent of sodium silicate, 1.0 percent of hydroxymethyl cellulose and 1.0 percent of sodium dodecyl benzene sulfonate are mechanically mixed until uniform, and the anti-segregation agent is prepared.
Application of anti-segregation agent
The results of comparative tests were carried out on the anti-segregation agents obtained in examples 1 to 3 and a blank sample without addition of the anti-segregation agent. According to GB8076-2008 'concrete admixture' and GBT 50081-2002 'common concrete mechanical property experiment method', the slump constant, the expansion degree, the bleeding rate, the setting time and the compressive strength of concrete for 0h are tested. The cement in the concrete is P.O 42.5 grade cement, the fly ash is II grade fly ash, the machine-made sand is fineness modulus 2.6 machine-made sand, the stones are respectively crushed stone of 5-10 mm and crushed stone of 10-20 mm, the water reducing agent is polycarboxylic acid high-efficiency water reducing agent, the mixing water is tap water, the respective dosage is shown in Table 1, and the unit is kg/m 3 。
TABLE 1 test using C30 concrete mix ratio
TABLE 2 results of the anti-ionogen experiment
As shown in the experiment results of the anti-segregation agent shown in the table 2, the blank concrete without the anti-segregation agent is in a segregation state, the concrete has serious bleeding, long setting time and strength which does not meet the design requirement of C30. 0.5-0.6 kg/m of the additive is added on the basis of blank concrete 3 The anti-segregation agent prepared in the embodiments 1 to 3 has the advantages of micro-bleeding of concrete, normal setting time and strength meeting the C30 design requirement, so that the anti-segregation agent provided by the application can solve the problems of concrete segregation and bleeding and the like without influencing the setting time and the strength of concrete at each age.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The method for treating the residual polymer of the aliphatic water reducing agent is characterized by comprising the following steps of:
drying, crushing and grinding the residual polymer of the aliphatic water reducing agent to obtain a granular residual polymer of the aliphatic water reducing agent;
sieving the residual polymer of the milled aliphatic water reducing agent, and selecting the residual polymer of the aliphatic water reducing agent with the particle size of less than 45 mu m as the residual polymer powder of the aliphatic water reducing agent;
mechanically mixing the residual aliphatic water reducer polymer powder with a synergist, a plasticizer and an air entraining agent until the mixture is uniform, and preparing to obtain an anti-segregation agent;
the mass ratio of the residual aliphatic water reducing agent polymer powder, the synergist, the plasticizer and the air entraining agent is (70-75): (24-28): (0.5-1): (0.5 to 1);
adding an anti-caking agent into the residual polymer of the aliphatic water reducing agent in the grinding process of the aliphatic water reducing agent polymer;
in the grinding process of the aliphatic water reducing agent polymer, adding 20-30% of an anti-caking agent according to the mass percentage of the aliphatic water reducing agent residual polymer;
the anti-caking agent comprises at least one of fly ash, mineral powder, silica fume and limestone powder;
the synergist comprises at least one of sodium sulfate and sodium silicate;
the residual polymer of the aliphatic water reducing agent is generated by condensation reaction in the storage process of the aliphatic water reducing agent.
2. The method for processing the residual polymer of the aliphatic water reducer according to claim 1, wherein the plasticizer comprises at least one of hydroxypropyl methylcellulose, hydroxymethyl cellulose and methylcellulose.
3. The method for treating the residual polymer of the aliphatic water reducing agent according to claim 1, wherein the air-entraining agent comprises at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and triterpenoid saponin.
4. The method for treating the residual polymer of the aliphatic water reducing agent according to claim 1, wherein the drying mode is natural air drying or low-temperature drying.
5. The method for treating the residual polymer of the aliphatic water reducing agent according to claim 1, wherein the crushing manner comprises jaw crushing.
6. The method for processing the residual polymer of the aliphatic water reducing agent according to claim 1, wherein the grinding comprises ball milling.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4243538A (en) * | 1979-06-07 | 1981-01-06 | Ethyl Corporation | Fuel and lubricating compositions containing N-hydroxymethyl aliphatic hydrocarbylamide friction reducers |
| CN101519288A (en) * | 2009-04-03 | 2009-09-02 | 南京瑞迪高新技术公司 | Special additive for underwater undispersed shrinking-free grouting material |
| CN102515610A (en) * | 2011-12-05 | 2012-06-27 | 马鞍山中海新材料有限公司 | Aliphatic series high efficiency slushing agent and preparation method thereof |
| CN111548050A (en) * | 2020-06-04 | 2020-08-18 | 江苏万邦新材料科技有限公司 | Concrete segregation-resistant water reducing agent and preparation method thereof |
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2021
- 2021-10-18 CN CN202111209305.XA patent/CN113788640B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4243538A (en) * | 1979-06-07 | 1981-01-06 | Ethyl Corporation | Fuel and lubricating compositions containing N-hydroxymethyl aliphatic hydrocarbylamide friction reducers |
| CN101519288A (en) * | 2009-04-03 | 2009-09-02 | 南京瑞迪高新技术公司 | Special additive for underwater undispersed shrinking-free grouting material |
| CN102515610A (en) * | 2011-12-05 | 2012-06-27 | 马鞍山中海新材料有限公司 | Aliphatic series high efficiency slushing agent and preparation method thereof |
| CN111548050A (en) * | 2020-06-04 | 2020-08-18 | 江苏万邦新材料科技有限公司 | Concrete segregation-resistant water reducing agent and preparation method thereof |
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