CN111100252A - Synthetic method of polycarboxylic acid water reducer with high water reducing rate and super slump retaining property - Google Patents
Synthetic method of polycarboxylic acid water reducer with high water reducing rate and super slump retaining property Download PDFInfo
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- CN111100252A CN111100252A CN201911332423.2A CN201911332423A CN111100252A CN 111100252 A CN111100252 A CN 111100252A CN 201911332423 A CN201911332423 A CN 201911332423A CN 111100252 A CN111100252 A CN 111100252A
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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
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
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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 relates to a synthetic method of a polycarboxylic acid water reducer with high water reducing rate and super slump retaining property, which comprises the following steps: (1) weighing an initiator reduction component, a chain transfer agent and deionized water, and uniformly mixing to prepare a solution A; (2) weighing unsaturated acid monomers, slump-retaining functional monomers and deionized water, and uniformly mixing to prepare a solution B; (3) under the condition of water bath, adding unsaturated polyether macromonomer and deionized water into a reaction vessel, and stirring and mixing; (4) adding an initiator oxidation component into the reaction container in the step (3), and then simultaneously dropwise adding the solution A and the solution B to start polymerization; (5) and after the dropwise addition is finished, continuously stirring and preserving heat for a certain time, and cooling to normal temperature to obtain the target water reducing agent. Compared with the prior art, the polycarboxylic acid water reducer synthesized by the invention has the advantages of small mixing amount, high water reducing rate, no need of compounding with the water reducer with high water reducing rate, long slump retaining time, strong adaptability to cement, simple synthesis process, environmental protection and the like.
Description
Technical Field
The invention belongs to the technical field of water reducing agents, and relates to a synthetic method of a polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining property, in particular to a synthetic method of a polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining property, which is prepared by a free radical copolymerization method by using isopentenyl polyoxyethylene ether (TPEG2400), an unsaturated acid monomer, a slump retaining functional monomer, a chain transfer agent, an initiator and deionized water.
Background
With the continuous development of building engineering, people have higher and higher requirements on the performance of concrete. Taking premixed concrete as an example, because a production enterprise of premixed concrete is generally far away from a construction site, the time consumed for transporting concrete is long, and the pumping time of concrete is long when large-volume concrete, an ultra-long concrete structure and an ultra-high-rise building are constructed, the concrete mixture is prepared in the production enterprise, transported to a pouring construction site, waits for pumping, and then pumped, poured and vibrated, and the time of 2 hours or even (3-4) hours may be required. In this period, if the slump loss of the concrete mixture is large, the normal unloading, pumping and pouring construction of the concrete is not facilitated, the engineering quality can be influenced, and even serious engineering accidents are caused. Therefore, it is difficult for the polycarboxylic acid water reducing agent having high water reducing property to satisfy the slump retention of ready-mixed concrete, and it is necessary to develop a polycarboxylic acid water reducing agent having high slump retention.
The polycarboxylic acid water reducing agent with high slump retaining property can be realized by compounding a common polycarboxylic acid water reducing agent and a retarding component, and can also be realized by a super-mixing method. However, both have certain technical defects, such as: the compound method can increase the manufacturing cost of the single concrete and has complex operation process, and the super-doping method is not beneficial to controlling the setting time of the concrete, thus leading to high gas content and reduced strength of the concrete.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for synthesizing a polycarboxylic acid water reducer with high water reducing rate and super slump retaining property, so as to meet the technical requirement of concrete engineering on high slump retaining property of concrete, and meanwhile, the water reducer has low mixing amount, does not contain harmful impurities such as formaldehyde, chloride ions and the like, and has the advantages of simple synthesis process, energy saving and environmental protection.
The invention can be realized by the following technical scheme:
a synthetic method of a polycarboxylic acid water reducer with high water reducing rate and super slump retention comprises the following steps:
(1) weighing an initiator reduction component, a chain transfer agent and deionized water, and uniformly mixing to prepare a solution A;
(2) weighing unsaturated acid monomers, slump-retaining functional monomers and deionized water, and uniformly mixing to prepare a solution B;
(3) unsaturated polyether macromonomer and deionized water are added into a four-neck flask of a reaction vessel, the four-neck flask of the reaction vessel is fixed on an iron support, the bottom of the four-neck flask is immersed in a water bath, and a cantilever type stirrer is connected above the four-neck flask. Starting a stirrer to dissolve the unsaturated polyether monomer in the deionized water;
(4) adding an initiator oxidation component into the reaction container in the step (3) at one time, then adding the solution A and the solution B into the reaction container in the step (3) at a constant speed within a certain time to start polymerization reaction, wherein the control of the process time is controlled by an automatic dropping instrument or a peristaltic pump and other instruments, and the whole polymerization reaction is continuously carried out under the conditions of water bath temperature and stirring;
(5) and (4) after the solution A and the solution B are dropwise added in the step (4), continuously stirring and preserving heat for a certain time, cooling the synthesized product to normal temperature, and neutralizing the prepared polycarboxylate superplasticizer mother liquor by adopting 35% NaOH aqueous solution until the pH value is 6-7 to obtain the target superplasticizer product.
Preferably, the unsaturated polyether macromonomer is isopentenyl polyoxyethylene ether, and the number average molecular weight of the unsaturated polyether macromonomer is 2400.
Preferably, the unsaturated acid monomer is acrylic acid.
Preferably, the slump-retaining functional monomer is hydroxyethyl acrylate.
Preferably, the initiator reducing component is ascorbic acid.
Preferably, the initiator oxidizing component is hydrogen peroxide or persulfate; further preferably, the initiator oxidizing component is hydrogen peroxide.
Preferably, the chain transfer agent is thioglycolic acid or mercaptopropionic acid; further preferably, the chain transfer agent is thioglycolic acid.
Preferably, the molar ratio of the unsaturated polyether macromonomer to the unsaturated acid monomer to the slump-retaining functional monomer is 1: (2.5-3.5): 3.
preferably, the initiator reduction component is 0.1 to 0.2 percent of the total weight of all monomers, the initiator oxidation component is 0.5 to 1.5 percent of the total weight of all monomers, and the chain transfer agent is 0.3 to 0.4 percent of the total weight of all monomers; further preferably, the initiator reducing component is 0.15% of the total weight of all monomers, the initiator oxidizing component is 1% of the total weight of all monomers, and the chain transfer agent is 0.35% of the total weight of all monomers.
Preferably, the water bath temperature is 40 ℃ to 50 ℃; the duration of the polymerization reaction is 3.5h-4 h; it is further preferred that the water bath temperature is 45 ℃.
Preferably, the dropping speeds of the solution A and the solution B respectively satisfy the following conditions: the finishing time of the solution A is 3-4 h, the finishing time of the solution B is 2.5-3.5 h, after finishing the dripping, a certain amount of deionized water is supplemented to ensure that the solid content of the prepared polycarboxylic acid water reducer is 40-41%, and the stirring and the heat preservation are continued for 15min-1 h; further preferably, the time for completing the dropwise addition of the solution A is 3.5 hours, the time for completing the dropwise addition of the solution B is 3 hours, and the temperature is kept for 0.5 hour after the dropwise addition is completed.
The molecular structure of the synthesized polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining property is a linear comb-shaped structure, and the polycarboxylic acid water reducing agent is prepared by copolymerizing unsaturated polyether macromonomer, unsaturated acid monomer and slump retaining functional monomer through unsaturated bond carbon-carbon double bonds. The main chain of the polycarboxylic acid water reducer mainly comprises an unsaturated acid monomer and a slump retaining functional monomer water reducer, wherein the two groups respectively provide functional groups such as carboxyl and ester groups in the cement hydration process, the carboxyl can be adsorbed and anchored in cement particles, so that the cement particles are charged with the same charge to generate electrostatic repulsion action and further repel each other, the initial dispersion performance is provided, and the ester groups are continuously hydrolyzed in the alkaline environment of cement paste and continuously release the carboxyl at the later stage along with the completion of the consumption of the carboxyl, so that the effect of continuously dispersing the cement particles is achieved, and the slump retaining effect is achieved. The side chain of the polycarboxylic acid water reducing agent mainly comprises a polyether macromonomer, and the polycarboxylic acid water reducing agent plays a role in dispersing cement particles mainly through steric hindrance. In the preparation process, the molar ratio of the polyether macromonomer, the unsaturated acid monomer and the slump-retaining functional monomer is mainly determined by a synthesis process and a water reducer performance characterization experiment, and the water reducer synthesized in the mixing amount range has the best water reducing performance and slump-retaining performance.
In the preparation process, the chain transfer agent, the initiator oxidation component and the initiator reduction component are respectively used for controlling the chain length of the polymer, initiating the unsaturated monomer to generate a polymerization reaction and terminating the polymerization reaction, although the three components have small mixing amount, the influence on the molecular synthesis structure of the water reducer and the control on the reaction process are very important, the mixing amount is mainly determined by a synthesis process and a water reducer performance characterization experiment, and the water reducer synthesized in the mixing amount range has the best water reducing performance and slump retaining performance.
The invention starts from the molecular structure design of the polycarboxylic acid water reducing agent and the slump retaining mechanism of the slump retaining polycarboxylic acid water reducing agent with the slump retaining function, prepares the polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining property by introducing the monomer with the slump retaining function, and has important significance for promoting the application of the polycarboxylic acid water reducing agent in the premixed concrete industry, realizing the high performance of concrete and promoting the sustainable development of the building material industry.
Compared with the prior art, the invention has the following advantages:
(1) compared with the common polycarboxylic acid water reducing agent, the synthesized polycarboxylic acid water reducing agent with high water reducing rate and super slump retention has low mixing amount, high water reducing rate and higher water reducing performance and slump retention performance, so that the polycarboxylic acid water reducing agent does not need to be compounded with the water reducing agent with high water reducing rate in the use process, and a concrete mixture can have higher fluidity at the beginning of the use of the water reducing agent, and is convenient to use;
(2) compared with the common polycarboxylic acid water reducing agent, the polycarboxylic acid water reducing agent synthesized by the invention can keep the fluidity of cement paste for 1-3 h without loss or with little loss, and shows excellent slump retaining effect;
(3) the polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining property synthesized by the invention does not use substances such as formaldehyde which are harmful to human bodies in the synthesis process, the synthesis process is green and environment-friendly, and the synthesized product does not contain chloride ions and has no corrosion hazard to reinforcing steel bars in concrete;
(4) the synthetic method of the polycarboxylic acid water reducer with high water reducing rate and super slump retention is simple, compared with the synthetic process of a common polycarboxylic acid water reducer, the synthetic method has the advantages of low synthetic temperature, low energy consumption, normal-pressure production, low requirement on equipment, convenience in operation and convenience in industrial production.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following examples, unless otherwise specified, the starting materials or the treatment techniques are all conventional and commercially available materials or conventional treatment techniques in the art.
Example 1
A polycarboxylic acid water reducer with high water reducing rate and super slump retaining property is synthesized into 500 parts by weight of mother liquor, and the concrete operation steps are as follows: fixing a four-mouth flask on an iron support, immersing the bottom end of the four-mouth flask in a constant-temperature water bath, adjusting the water bath temperature to 45 ℃, ensuring that the whole polymerization reaction process is carried out under the temperature condition, placing a thermometer, a stirrer, a constant-pressure funnel and a wood plug inserted with a conduit for connecting A liquid and B liquid on the four-mouth flask, and adjusting the height of the four-mouth flask to ensure that the stirrer can normally work. The polyether macromonomer TPEG-2400, the unsaturated acid monomer AA and the slump-retaining functional monomer HEA are adopted, wherein the molar ratio of the polyether macromonomer TPEG-2400 to the unsaturated acid monomer AA to the slump-retaining functional monomer HEA is 1: 2.5: 3. 163.93 parts by weight of TPEG-2400 and 100 parts by weight of deionized water were placed in a four-necked flask and a stirrer was started, and the rotation speed of the stirrer was adjusted to maintain uniform and high-speed rotation. Weighing 0.3 part by weight of VC, 0.7 part by weight of thioglycolic acid and 100 parts by weight of deionized water to prepare solution A, uniformly stirring, and weighing 12.29 parts by weightA solution B prepared from AA (part by weight), HEA (part by weight), and deionized water (part by weight) was stirred uniformly, and 2.0 parts by weight of H was added in one portion to a four-neck flask to which 163.93 parts by weight of TPEG-2400 (part by weight) and 100 parts by weight of deionized water were added2O2And then setting relevant parameters of an automatic dropping instrument and starting reaction equipment to enable the solution A and the solution B to be added into a four-neck flask according to the dropping rate of 3.5h of the solution A/3 h of the solution B to start polymerization, supplementing a certain amount of deionized water to the obtained solution of 500 parts by weight after the dropping is finished, enabling the solid content of the prepared water reducer to be 40.6%, continuing stirring and keeping the temperature for 30min to finish the polymerization. After cooling to normal temperature, using 35% NaOH aqueous solution to neutralize the prepared polycarboxylic acid water reducer mother liquor until the PH value is 6-7, thereby preparing the polycarboxylic acid water reducer with high water reducing rate and super slump retaining property.
Example 2
A polycarboxylic acid water reducer with high water reducing rate and super slump retaining property is synthesized into 500 parts by weight of mother liquor, and the concrete operation steps are as follows: fixing a four-mouth flask on an iron support, immersing the bottom end of the four-mouth flask in a constant-temperature water bath, adjusting the water bath temperature to 45 ℃, ensuring that the whole polymerization reaction process is carried out under the temperature condition, placing a thermometer, a stirrer, a constant-pressure funnel and a wood plug inserted with a conduit for connecting A liquid and B liquid on the four-mouth flask, and adjusting the height of the four-mouth flask to ensure that the stirrer can normally work. The polyether macromonomer TPEG-2400, the unsaturated acid monomer AA and the slump-retaining functional monomer HEA are adopted, wherein the molar ratio of the polyether macromonomer TPEG-2400 to the unsaturated acid monomer AA to the slump-retaining functional monomer HEA is 1: 3: 3. 161.94 parts by weight of TPEG-2400 and 100 parts by weight of deionized water were added to a four-necked flask and the stirrer was started and rotated at a constant high speed by adjusting the rotation speed of the stirrer. Weighing 0.3 part by weight of VC, 0.7 part by weight of thioglycolic acid and 100 parts by weight of deionized water to prepare solution A, uniformly stirring, weighing 14.57 parts by weight of AA, 23.48 parts by weight of HEA and 50 parts by weight of deionized water to prepare solution B, uniformly stirring, and adding 2.0 parts by weight of H into a four-neck flask into which 160.97 parts by weight of TPEG-2400 and 100 parts by weight of deionized water are added at one time2O2Then, relevant parameters of an automatic dropping instrument are set and reaction equipment is started to enable the solution A and the solution B to be added into four ports according to the dropping rate of 3.5h of the solution A/3 h of the solution BAnd starting a polymerization reaction in the flask, supplementing a certain amount of deionized water after the dropwise addition is finished until the obtained solution is 500 parts by weight, so that the solid content of the prepared water reducing agent is 40.6%, continuously stirring and keeping the temperature for 30min to finish the polymerization reaction. After cooling to normal temperature, using 35% NaOH aqueous solution to neutralize the prepared polycarboxylic acid water reducer mother liquor until the PH value is 6-7, thereby preparing the polycarboxylic acid water reducer with high water reducing rate and super slump retaining property.
Example 3
A polycarboxylic acid water reducer with high water reducing rate and super slump retaining property is synthesized into 500 parts by weight of mother liquor, and the concrete operation steps are as follows: fixing a four-mouth flask on an iron support, immersing the bottom end of the four-mouth flask in a constant-temperature water bath, adjusting the water bath temperature to 45 ℃, ensuring that the whole polymerization reaction process is carried out under the temperature condition, placing a thermometer, a stirrer, a constant-pressure funnel and a wood plug inserted with a conduit for connecting A liquid and B liquid on the four-mouth flask, and adjusting the height of the four-mouth flask to ensure that the stirrer can normally work. The polyether macromonomer TPEG-2400, the unsaturated acid monomer AA and the slump-retaining functional monomer HEA are adopted, wherein the molar ratio of the polyether macromonomer TPEG-2400 to the unsaturated acid monomer AA to the slump-retaining functional monomer HEA is 1: 3.5: 3. 160.00 parts by weight of TPEG-2400 and 100 parts by weight of deionized water were added to a four-necked flask and the stirrer was started and rotated at a constant high speed by adjusting the rotation speed of the stirrer. Weighing 0.3 part by weight of VC, 0.7 part by weight of thioglycolic acid and 100 parts by weight of deionized water to prepare solution A, uniformly stirring, weighing 16.8 parts by weight of AA, 23.2 parts by weight of HEA and 50 parts by weight of deionized water to prepare solution B, uniformly stirring, and adding 2.0 parts by weight of H into a four-neck flask into which 160.00 parts by weight of TPEG-2400 and 100 parts by weight of deionized water are added at one time2O2And then setting relevant parameters of an automatic dropping instrument and starting reaction equipment to enable the solution A and the solution B to be added into a four-neck flask according to the dropping rate of 3.5h of the solution A/3 h of the solution B to start polymerization, supplementing a certain amount of deionized water to the obtained solution of 500 parts by weight after the dropping is finished, enabling the solid content of the prepared water reducing agent to be 40.6%, continuously stirring and preserving heat for 30min to finish the polymerization. After cooling to normal temperature, using 35% NaOH aqueous solution to neutralize the prepared polycarboxylic acid water reducing agent mother liquor until the PH value is 6-7, thereby preparing the polycarboxylic acid water reducing agent with high water reducing rate and super slump retaining propertyA polycarboxylic acid water reducing agent.
The samples obtained in the three examples are subjected to a net slurry fluidity test according to GBT8077-2012 test method for concrete admixture, southern P.O 42.5 cement and sea snail P.O 42.5 cement are adopted as the cement, the water cement ratio is 0.29, and the folded solid admixture content of the admixture is 0.2%. The test results are shown in tables 1 and 2.
Table 1 results of performance test of each example
Table 2 examples performance test results
As can be seen from the above table, compared with a blank group, the initial fluidity of cement paste obtained by adding the samples obtained by the three examples is greatly changed, which shows that the polycarboxylic acid water reducer synthesized by the invention has higher water reducing rate, the loss of the fluidity of the cement paste is small within 3h or even the fluidity of the cement paste is increased within a certain time range, which shows that the polycarboxylic acid water reducer synthesized by the invention has excellent slump retaining performance, and two cement paste experiments show that the polycarboxylic acid water reducer has good adaptability to cement and has better adaptability to southern cement.
In the above embodiments, the addition amount of the raw material reagents such as the unsaturated polyether macromonomer, the unsaturated acid monomer, the slump-retaining functional monomer, the initiator reducing component, and the like, and the process conditions such as the reaction time, the titration time, the temperature, and the like can be arbitrarily selected and adjusted within the range defined in the above description.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A synthetic method of a polycarboxylic acid water reducer with high water reducing rate and super slump retention is characterized by comprising the following steps:
(1) weighing an initiator reduction component, a chain transfer agent and deionized water, and uniformly mixing to prepare a solution A;
(2) weighing unsaturated acid monomers, slump-retaining functional monomers and deionized water, and uniformly mixing to prepare a solution B;
(3) adding unsaturated polyether macromonomer and deionized water into a four-neck flask serving as a reaction container, wherein the four-neck flask of the reaction container is fixed on an iron support, the bottom of the four-neck flask is immersed in a water bath kettle, a cantilever type stirrer is connected above the four-neck flask, and the cantilever type stirrer is started to dissolve the unsaturated polyether macromonomer in the deionized water;
(4) adding an initiator oxidation component into the reaction container in the step (3) at one time, then adding the solution A and the solution B into the reaction container in the step (3) at a constant speed within a certain time to start a polymerization reaction, and continuously carrying out the whole polymerization reaction under the conditions of water bath temperature and stirring;
(5) and (4) after the solution A and the solution B are dripped in the step (4), supplementing a certain amount of deionized water until the solid content is a target value, continuing stirring and keeping the temperature for a certain time, cooling the synthesized product to normal temperature, and neutralizing the prepared polycarboxylic acid water reducer mother liquor by adopting 35% NaOH aqueous solution until the pH value is 6-7 to obtain the target water reducer product.
2. The method for synthesizing the polycarboxylic acid water reducer with high water reducing rate and slump retention according to claim 1, wherein the unsaturated polyether macromonomer is isopentenyl polyoxyethylene ether, and the number average molecular weight of the unsaturated polyether macromonomer is 2400.
3. The method for synthesizing the polycarboxylic acid water reducer with high water reduction rate and slump retention property according to claim 1, wherein the unsaturated acid monomer is acrylic acid.
4. The method for synthesizing the polycarboxylic acid water reducer with high water reducing rate and super slump retention as claimed in claim 1, wherein the slump retention type functional monomer is hydroxyethyl acrylate.
5. The method for synthesizing the polycarboxylic acid water reducer with high water reducing rate and slump retention according to claim 1, wherein the initiator reducing component is ascorbic acid.
6. The synthesis method of the polycarboxylic acid water reducer with both high water reducing rate and slump retaining property as claimed in claim 1, wherein the initiator oxidizing component is hydrogen peroxide or persulfate.
7. The method for synthesizing the polycarboxylic acid water reducer with both high water reducing rate and slump retaining property as claimed in claim 1, wherein the chain transfer agent is thioglycolic acid or mercaptopropionic acid.
8. The method for synthesizing the polycarboxylic acid water reducer with high water reducing rate and super slump retaining property according to claim 1, wherein the molar ratio of the unsaturated polyether macromonomer, the unsaturated acid monomer and the slump retaining functional monomer is 1: (2.5-3.5): 3;
weighing by an external doping method, wherein the initiator reducing component accounts for 0.1-0.2% of the total weight of all monomers, the initiator oxidizing component accounts for 0.5-1.5% of the total weight of all monomers, and the chain transfer agent accounts for 0.3-0.4% of the total weight of all monomers.
9. The synthesis method of the polycarboxylic acid water reducer with both high water reducing rate and slump retaining property as claimed in claim 1, wherein the water bath temperature is 40-50 ℃, and the duration of the polymerization reaction is 3.5-4 h.
10. The method for synthesizing the polycarboxylic acid water reducer with high water reducing rate and super slump retaining property according to claim 1, wherein the dropping speeds of the solution A and the solution B respectively satisfy the following requirements: the finishing time of the solution A is 3-4 h, the finishing time of the solution B is 2.5-3.5 h, and the solution A is kept warm for 15min-1h after finishing the dripping; the prepared water reducing agent has the target solid content of 40-41%.
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| CN108794700A (en) * | 2018-07-09 | 2018-11-13 | 福建路桥翔通建材科技有限公司 | A kind of carboxylic acid group polymer and preparation method thereof and sustained-release polycarboxylic water reducer |
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| CN114790103A (en) * | 2022-05-09 | 2022-07-26 | 东南大学 | High-thixotropy 3D printing concrete with long opening time and preparation method thereof |
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