CN111100253A - Concrete anti-sensitive polycarboxylate superplasticizer and preparation method thereof - Google Patents
Concrete anti-sensitive polycarboxylate superplasticizer and preparation method thereof Download PDFInfo
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- CN111100253A CN111100253A CN201911411785.0A CN201911411785A CN111100253A CN 111100253 A CN111100253 A CN 111100253A CN 201911411785 A CN201911411785 A CN 201911411785A CN 111100253 A CN111100253 A CN 111100253A
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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
- C08F283/002—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers modified by after-treatment
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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
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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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
- 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 provides a concrete anti-sensitive polycarboxylate superplasticizer and a preparation method thereof, wherein the concrete anti-sensitive polycarboxylate superplasticizer is prepared from the following materials: deionized water, block modified unsaturated polyoxyethylene ether, prenol polyoxyethylene ether, unsaturated carboxylic acid, ester functional monomer, sulfonic acid functional monomer, chain transfer agent, oxidant, emulsifier and reducing agent; the invention combines a plurality of polyethers on the side chain of the block unsaturated polyoxyethylene ether and the prenyl polyoxyethylene ether molecule, can give full play to the characteristics of different side chain molecules, and has the advantages of low sensitivity, large doping amount range, good cement workability and low use cost; emulsion polymerization is adopted, so that the reaction efficiency of the ester functional monomer is effectively improved, and the performance of the water reducing agent is improved; the method is green and environment-friendly, the production process is simple, and the product does not contain chloride ions and heavy metal components and has no corrosion hazard to concrete reinforcing steel bars.
Description
Technical Field
The invention relates to the technical field of building additives, in particular to a concrete anti-sensitivity type polycarboxylate water reducer and a preparation method thereof.
Background
As a novel high-performance water reducing agent, the polycarboxylic acid water reducing agent has the outstanding advantages of high water reducing rate, good concrete performance maintenance, no environmental pollution and the like, gradually replaces the common naphthalene water reducing agent, and has the market share of over 80 percent at present. Compared with naphthalene water reducing agents, the polycarboxylic acid water reducing agent has higher water reducing rate which can reach more than 40 percent, can obviously reduce the water consumption in concrete and improve the strength. However, the sensitivity of concrete to water is greatly improved due to high water reduction, and the application of materials with poor water retention such as slag cement and machine-made sand causes the problems of bleeding, segregation, bottom grabbing, hardening and the like easily occurring in the construction process of many concrete at present. The construction quality and the construction progress are seriously influenced.
In the face of the situation, some manufacturers can solve the problem by adjusting the aggregate proportion of the concrete, but the materials in the building market are gradually deteriorated, the material quality is unstable, and the production cost is greatly increased. On the other hand, some manufacturers reduce the sensitivity to water and materials by compounding a proper amount of water retention viscosity modifier and workability modifier in the water reducing agent, and improve the workability of concrete, but the product has the defects of high cost, incompatibility with the polycarboxylic acid water reducing agent, precipitation and delamination, and the viscosity of concrete is increased, so that the fluidity is influenced; therefore, the polycarboxylic acid water reducing agent has strong adaptability to materials, low sensitivity to water and excellent water reducing effect and slump retaining effect, and has great significance.
The publication No. CN105217992A discloses a high-efficiency solution for improving segregation and bleeding of concrete caused by over-doping, which is to dissolve polyethylene glycol solutions with different molecular weights in a certain proportion into a water reducing agent to improve the state of concrete mixture, and the method has the advantages of simple use and good compatibility, and has the defects of high air entraining performance of polyethylene glycol, easy increase of the air content of concrete and reduction of the strength of concrete; the publication No. CN109021180A discloses a low-sensitivity shrinkage-reducing type polycarboxylate water reducer and a preparation method thereof, wherein a rigid benzene ring structure is connected into a polycarboxylate molecular chain, so that the low-sensitivity shrinkage-reducing type polycarboxylate water reducer is good in dispersibility and strong in adaptability, and can effectively reduce the sensitivity of the water reducer to mud content. However, the process of the invention is harsh, the raw materials need to react under the conditions of high temperature and nitrogen protection, the process is complex, and the cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a concrete anti-sensitive polycarboxylate superplasticizer and a preparation method thereof.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention aims to provide a concrete anti-sensitive polycarboxylate superplasticizer which comprises the following raw materials in parts by weight: 600 parts of deionized water 599-containing organic silica gel, 102-151.3 parts of block modified unsaturated polyoxyethylene ether, 250 parts of prenyl alcohol polyoxyethylene ether 200-containing organic silica gel, 30-38 parts of unsaturated carboxylic acid, 3-5 parts of ester functional monomer, 4-8 parts of sulfonic acid functional monomer, 0.83-1.42 parts of chain transfer agent, 0.63-3.1 parts of oxidant, 2-3 parts of emulsifier and 0.36-0.57 part of reducing agent.
Further, the molecular size of the block modified unsaturated polyoxyethylene ether is 3000-4000; after the block polyether side chain is embedded into the propylene oxide, the structure of the block polyether side chain is more extended, the stability of the slurry can be improved through mechanisms such as the winding action of the side chain, the concrete slurry is isolated and distributed in a more uniform mode, the viscosity of the concrete is adjusted, and the phenomena of bottom grabbing and bleeding of the concrete are effectively reduced.
Further, the molecular weight of the isopentenol polyoxyethylene ether is 2000-3000; the prenyl polyoxyethylene ether is used as the water reducer polyether with wide application, and has the advantages of superior performance, good slump retaining performance, strong applicability and low cost.
Further, the unsaturated carboxylic acid is one or more of acrylic acid, methacrylic acid and maleic anhydride.
Furthermore, the sulfonic acid functional monomers are 2-acrylamide-2-methylpropanesulfonic acid and sodium methacrylate, and after the water reducing agent is introduced into the sulfonic acid functional monomers, the density of polyether side chains can be increased, the initial adsorption capacity of cement particles on the water reducing agent is reduced, the thickness of an adsorption layer is increased, the zeta potential on the surfaces of the cement particles can be obviously reduced, the water reducing agent has better dispersibility and retentivity on concrete with high mud content, the sensitivity of the polycarboxylic acid water reducing agent on the mud content is reduced, the function of the water reducing agent is better exerted, and the state of a concrete mixture is improved; the ester functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate.
Further, the emulsifier is one or more of nonylphenol polyoxyethylene ether NP-7, NP-8, NP-9, NP-10, NP-15 and NP-40; NP, also known as nonylphenol polyoxyethylene ether, is colorless transparent liquid, is used as a W/O type emulsifier or an O/W type emulsifier, dispersant, is the main raw material of synthetic detergents; trade name of nonylphenol polyoxyethylene ether: TX-n, NP-n chemical composition.
Further, the chain transfer agent is one or more of thioglycolic acid, mercaptoethanol, mercaptopropionic acid and sodium hypophosphite.
Further, the oxidant is one or more of hydrogen peroxide and a peroxysulfuric acid compound.
Further, the reducing agent is at least one of vitamin C, sodium formaldehyde sulfoxylate, Mohr's salt and sodium bisulfite.
The second purpose of the invention is to provide a preparation method of the concrete anti-sensitive polycarboxylate superplasticizer, which comprises the following steps:
(1) dissolving unsaturated carboxylic acid and sulfonic acid functional monomers in deionized water to prepare a dropping liquid A material for later use, and dissolving a chain transfer agent and a reducing agent in deionized water to prepare a dropping liquid B material for later use;
(2) adding deionized water, block modified unsaturated polyoxyethylene ether and prenol polyoxyethylene ether into a glass reaction kettle equipped with a stirrer, a thermometer and a dropping device, heating while stirring for dissolving uniformly to obtain a transparent solution, then adding an emulsifier and an ester functional monomer, and finally adding an oxidant;
(3) after the solution in the glass reaction kettle is heated to 35-50 ℃, dropwise adding the prepared material A and material B into the glass reaction kettle at a constant speed, controlling the dropwise adding time of the material A to be 2-4 hours and the dropwise adding time of the material B to be 3-5 hours, and continuing to perform heat preservation reaction for 1-2 hours after the dropwise adding is finished;
(4) and finally, adding deionized water to adjust the solid content to 40% to obtain the concrete anti-sensitive polycarboxylate superplasticizer.
The invention has the beneficial effects that: the block unsaturated polyoxyethylene ether and the prenyl polyoxyethylene ether are combined with a plurality of polyethers on the molecular side chain, so that the characteristics of different side chain molecules can be fully exerted, the sensitivity is low, the doping range is large, the workability of cement is good, and the use cost is low; emulsion polymerization is adopted, so that the reaction efficiency of the ester functional monomer is effectively improved, and the performance of the water reducing agent is improved; the invention is green and environment-friendly, the production process is simple, and the product does not contain chloride ions and heavy metal components and has no corrosion hazard to concrete reinforcing steel bars; the product belongs to a functional polycarboxylate superplasticizer, has good compatibility with concrete, and has no layered segregation phenomenon.
Detailed Description
The present invention will be described in detail with reference to the following examples:
example 1:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 171.3 parts of block modified unsaturated polyoxyethylene ether with molecular weight of 3500 and 180 parts of prenyl polyoxyethylene ether with molecular weight of 2400 into a glass reaction kettle equipped with a stirrer, a thermometer and a dropping device, stirring while heating, keeping the temperature at 40 ℃, and sequentially adding 2 parts of NP-10 emulsifier, 5 parts of methyl methacrylate and 0.63 part of 30% hydrogen peroxide after materials are dissolved; then, material A consisting of 36 parts of acrylic acid, 4 parts of sodium methallyl sulfonate and 20 parts of deionized water is dropwise added at a constant speed, and the dropwise adding time is controlled to be 3 hours; dropwise adding a material B consisting of 1.42 parts of mercaptopropionic acid, 0.36 parts of vitamin C and 50 parts of deionized water, wherein the dropwise adding time is controlled to be 3.5 hours; after the dropwise addition is finished, the temperature is kept at 40 ℃ for reaction for 1.5 h; and adding 289 parts of deionized water to dilute the mixture to 40% of solid content after the reaction is finished, and finally obtaining the concrete anti-sensitive polycarboxylate superplasticizer.
Example 2:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 151.3 parts of block modified unsaturated polyoxyethylene ether with the molecular weight of 3500 and 200 parts of isoamylol polyoxyethylene ether with the molecular weight of 2400 into a glass reaction kettle provided with a stirrer, a thermometer and a dropping device, stirring while heating, keeping the temperature at 40 ℃, and sequentially adding 2 parts of NP-7 emulsifier, 5 parts of hydroxyethyl acrylate and 0.63 part of 30% hydrogen peroxide after materials are dissolved; then, material A consisting of 36 parts of methacrylic acid, 4 parts of 2-acrylamide-2-methylpropanesulfonic acid and 20 parts of deionized water is dropwise added at a constant speed, and the dropwise adding time is controlled to be 3 hours; dropwise adding a material B consisting of 1.42 parts of thioglycolic acid, 0.36 parts of sodium formaldehyde sulfoxylate and 50 parts of deionized water, wherein the dropwise adding time is controlled to be 3.5 hours; after the dropwise addition is finished, the temperature is kept at 40 ℃ for reaction for 1.5 h; and adding 289 parts of deionized water to dilute the mixture to 40% of solid content after the reaction is finished, and finally obtaining the concrete anti-sensitive polycarboxylate superplasticizer.
Example 3:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 130.3 parts of block modified unsaturated polyoxyethylene ether with molecular weight of 3500 and 221 parts of prenyl polyoxyethylene ether with molecular weight of 2400 into a glass reaction kettle equipped with a stirrer, a thermometer and a dropping device, stirring while heating, keeping the temperature at 40 ℃, and sequentially adding 2 parts of NP-8 emulsifier, 5 parts of methyl acrylate and 3.1 parts of ammonium persulfate after the materials are dissolved; then, material A consisting of 36 parts of maleic anhydride, 4 parts of sodium methacrylate and 20 parts of deionized water is dropwise added at a constant speed, and the dropwise adding time is controlled to be 3 hours; dropwise adding a material B consisting of 1.42 parts of mercaptoethanol, 0.36 part of Mohr's salt and 50 parts of deionized water, wherein the dropwise adding time is controlled to be 3.5 hours; after the dropwise addition is finished, the temperature is kept at 40 ℃ for reaction for 1.5 h; and adding 289 parts of deionized water to dilute the mixture to 40% of solid content after the reaction is finished, and finally obtaining the concrete anti-sensitive polycarboxylate superplasticizer.
Example 4:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 150 parts of block modified unsaturated polyoxyethylene ether with the molecular weight of 3500 and 200 parts of prenyl polyoxyethylene ether with the molecular weight of 2400 into a glass reaction kettle provided with a stirrer, a thermometer and a dropping device, stirring while heating, keeping the temperature at 40 ℃, and sequentially adding 2 parts of NP-10 emulsifier, 1.3 parts of NP-15 emulsifier, 3 parts of ethyl acrylate, 2 parts of hydroxypropyl acrylate and 0.63 part of 30% hydrogen peroxide after materials are dissolved; then, dropping a material A consisting of 30 parts of acrylic acid, 6 parts of methacrylic acid, 4 parts of sodium methallyl sulfonate and 20 parts of deionized water at a constant speed, wherein the dropping time is controlled to be 3 hours; dropwise adding a material B consisting of 1 part of mercaptopropionic acid, 0.42 part of sodium hypophosphite, 0.36 part of sodium bisulfite and 50 parts of deionized water, wherein the dropwise adding time is controlled to be 3.5 hours; after the dropwise addition is finished, the temperature is kept at 40 ℃ for reaction for 1.5 h; and adding 289 parts of deionized water to dilute the mixture to 40% of solid content after the reaction is finished, and finally obtaining the concrete anti-sensitive polycarboxylate superplasticizer.
Example 5:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 145 parts of block modified unsaturated polyoxyethylene ether with the molecular weight of 4000 and 202 parts of prenyl polyoxyethylene ether with the molecular weight of 3000 into a glass reaction kettle provided with a stirrer, a thermometer and a dropping device, stirring and heating while keeping the temperature at 45 ℃, and sequentially adding 1 part of NP-7 emulsifier, 2 parts of NP-40 emulsifier, 2 parts of hydroxybutyl acrylate, 3 parts of ethyl methacrylate and 1.08 part of 30% hydrogen peroxide after materials are dissolved; then, uniformly dripping a material A consisting of 30 parts of acrylic acid, 8 parts of maleic anhydride, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid and 20 parts of deionized water, wherein the dripping time is controlled to be 3 hours; dropwise adding a material B consisting of 0.9 part of thioglycolic acid, 0.4 part of mercaptoethanol, 0.42 part of vitamin C and 50 parts of deionized water, controlling the dropwise adding time to be 3.5h, and continuously keeping 45 ℃ for reacting for 1.5h after the dropwise adding is finished; and adding 289 parts of deionized water to dilute the mixture to 40% of solid content after the reaction is finished, and finally obtaining the concrete anti-sensitive polycarboxylate superplasticizer.
Example 6:
a concrete anti-sensitive polycarboxylate water reducing agent is prepared by adding 240 parts of deionized water, 102 parts of block modified unsaturated polyoxyethylene ether with the molecular weight of 4000 and 250 parts of prenyl polyoxyethylene ether with the molecular weight of 3000 into a glass reaction kettle provided with a stirrer, a thermometer and a dropping device, stirring and heating while keeping the temperature at 45 ℃, and sequentially adding 1 part of NP-8 emulsifier, 1.5 parts of NP-9 emulsifier, 1 part of butyl acrylate, 2 parts of ethyl methacrylate and 3.1 parts of ammonium persulfate after the materials are dissolved; then, material A consisting of 20 parts of methacrylic acid, 10 parts of maleic anhydride, 8 parts of sodium methallyl sulfonate and 20 parts of deionized water is dropwise added at a constant speed, and the dropwise adding time is controlled to be 3 hours; dropwise adding a material B consisting of 0.43 part of mercaptoethanol, 0.4 part of mercaptopropionic acid, 0.57 part of vitamin C and 20 parts of deionized water, controlling the dropwise adding time to be 3.5h, and continuously keeping 45 ℃ for reacting for 1.5h after the dropwise adding is finished; and after the reaction is finished, 290 parts of deionized water is added to dilute the mixture until the solid content is 40 percent, and finally the concrete anti-sensitive polycarboxylate superplasticizer is obtained.
Comparative example 1:
a conventional polycarboxylic acid water reducing agent comprises the following raw materials in parts by weight: 352 parts of prenyl alcohol polyoxyethylene ether with the molecular weight of 3000, 43 parts of acrylic acid, 0.5 part of vitamin C, 2.4 parts of mercaptopropionic acid and 2.2 parts of 30% hydrogen peroxide, and supplementing water to 40% of solid content to obtain the product.
Comparative example 2:
a conventional polycarboxylic acid water reducing agent comprises the following raw materials in parts by weight: 355 parts of isobutylene polyoxyethylene ether with the molecular weight of 2400, 41 parts of acrylic acid, 0.23 part of vitamin C, 1.67 parts of mercaptopropionic acid, 0.56 part of 30% hydrogen peroxide and 16.5 parts of 30% sodium hydroxide aqueous solution, and supplementing water to 40% of solid content to obtain the product.
The concrete performance test is carried out according to the method specified in GB8076-2008, and the concrete strength is C30 proportioning grade. The cement is red flag P.O42.5 ordinary portland cement; the sand is machine-made sand with fineness modulus of 2.9 and mud content of 2 percent; the fine stone is 5-10mm, and the coarse stone is 15-25 mm. The concrete mixture ratio of C30 is: 4.74kg of cement, 12kg of machine-made sand, 5kg of fine stone, 10kg of coarse stone and 1.2kg of tap water. The method is characterized in that the doping amount of the concrete in a proper flowing state is determined through experiments, the doping amount of the water reducing agent is close to saturation, the sensitivity of the concrete state to the water consumption is verified by increasing and reducing the water consumption, and the beneficial effects of the method are highlighted by comparing the concrete state.
Table 1: target mixing amount of examples and comparative examples and concrete indexes thereof
Note: the target mixing amount in the table refers to the mixing amount of the water reducing agent when the concrete reaches a proper flowing state, and the mixing amount of the water reducing agent is close to saturation.
Table 2: slump and expansion degree of concrete under target mixing amount under different water consumption
As can be seen from the data in Table 1, the concrete indexes of the examples are within the acceptable range, which indicates that the invention has no adverse effect on the concrete. Meanwhile, in the machine-made sand with larger mud content, compared with the common polycarboxylic acid water reducing agent, the synthesized embodiment of the invention has better water reducing rate effect, and the mixing amount is less under the proper fluidity, so that the invention has better adaptability to the material with higher mud content and deteriorated material quality.
The experimental results in Table 2 show that the slump and the slump change in the examples of the present invention are smaller than the slump and the slump change in the examples of the present invention when the amount of water used is changed. The comparative example shows segregation state of concrete after the water amount is increased by 0.3%, while the examples still maintain good concrete state. This indicates that the embodiments of the present invention are less sensitive to water, allow a greater range of water usage within the target loading range, and have a wider range of applications.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention without departing from the content of the technical solution of the present invention.
Claims (10)
1. The concrete anti-sensitive polycarboxylate superplasticizer is characterized by comprising the following raw materials in parts by weight: 600 parts of deionized water 599-containing organic silica gel, 102-151.3 parts of block modified unsaturated polyoxyethylene ether, 250 parts of prenyl alcohol polyoxyethylene ether 200-containing organic silica gel, 30-38 parts of unsaturated carboxylic acid, 3-5 parts of ester functional monomer, 4-8 parts of sulfonic acid functional monomer, 0.83-1.42 parts of chain transfer agent, 0.63-3.1 parts of oxidant, 2-3 parts of emulsifier and 0.36-0.57 part of reducing agent.
2. The concrete anti-sensitivity type polycarboxylate water reducer as claimed in claim 1, wherein the molecular weight of the block-modified unsaturated polyoxyethylene ether is 3000-4000.
3. The concrete anti-sensitivity type polycarboxylate water reducer as claimed in claim 1, wherein the molecular weight of the prenyl polyoxyethylene ether is 2000-3000.
4. The concrete anti-sensitivity polycarboxylate water reducer according to claim 1, characterized in that the unsaturated carboxylic acid is one or more of acrylic acid, methacrylic acid and maleic anhydride.
5. The concrete anti-sensitivity polycarboxylate water reducer according to claim 1, wherein the sulfonic acid functional monomer is 2-acrylamide-2-methylpropanesulfonic acid or sodium methacrylate, and the ester functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate.
6. The concrete anti-sensitivity polycarboxylate water reducer as claimed in claim 1, wherein the emulsifier is one or more of nonylphenol polyoxyethylene ether NP-7, NP-8, NP-9, NP-10, NP-15 and NP-40.
7. The concrete anti-sensitivity type polycarboxylate water reducer according to claim 1, wherein the chain transfer agent is one or more of thioglycolic acid, mercaptoethanol, mercaptopropionic acid and sodium hypophosphite.
8. The concrete anti-sensitivity type polycarboxylate water reducer according to claim 1, characterized in that the oxidant is one or more of hydrogen peroxide and a peroxysulfuric acid compound.
9. The concrete anti-sensitivity type polycarboxylate water reducer as claimed in claim 1, wherein said reducing agent is at least one of vitamin C, sodium formaldehyde sulfoxylate, Mohr's salt and sodium bisulfite.
10. The preparation method of the concrete anti-sensitivity type polycarboxylate superplasticizer according to claim 1, characterized by comprising the following steps:
(1) dissolving unsaturated carboxylic acid and sulfonic acid functional monomers in deionized water to prepare a dropping liquid A material for later use, and dissolving a chain transfer agent and a reducing agent in deionized water to prepare a dropping liquid B material for later use;
(2) adding deionized water, block modified unsaturated polyoxyethylene ether and prenol polyoxyethylene ether into a glass reaction kettle equipped with a stirrer, a thermometer and a dropping device, heating while stirring for dissolving uniformly to obtain a transparent solution, then adding an emulsifier and an ester functional monomer, and finally adding an oxidant;
(3) after the solution in the glass reaction kettle is heated to 35-50 ℃, dropwise adding the prepared material A and material B into the glass reaction kettle at a constant speed, controlling the dropwise adding time of the material A to be 2-4 hours and the dropwise adding time of the material B to be 3-5 hours, and continuing to perform heat preservation reaction for 1-2 hours after the dropwise adding is finished;
(4) and finally, adding the balance of deionized water to adjust the solid content to 40% so as to obtain the concrete anti-sensitive polycarboxylate superplasticizer.
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| CN111592628A (en) * | 2020-06-10 | 2020-08-28 | 竹鹏翔 | Preparation method of early-strength polycarboxylic acid high-performance water reducing agent |
| CN111689712A (en) * | 2020-06-09 | 2020-09-22 | 洛阳君江建材科技有限公司 | Polycarboxylate superplasticizer with low sensitivity to environmental temperature and preparation method thereof |
| CN111905677A (en) * | 2020-07-29 | 2020-11-10 | 安庆泽远化工有限公司 | Production method of polycarboxylic acid high-performance water reducing agent for concrete pipe pile |
| CN113929837A (en) * | 2021-11-03 | 2022-01-14 | 同济大学 | Shrinkage-reducing polycarboxylic acid water reducer and preparation method and application thereof |
| CN113999348A (en) * | 2021-11-24 | 2022-02-01 | 湖南金华达建材有限公司 | Viscosity reduction type ester ether copolymerization polycarboxylate superplasticizer and normal-temperature preparation method thereof |
| CN114213604A (en) * | 2021-12-31 | 2022-03-22 | 吉安民辉新型材料有限公司 | Water reducing agent for fabricated concrete member and preparation method thereof |
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