CN116023578B - Polyesterpolymer concrete water-retaining agent and preparation method thereof - Google Patents
Polyesterpolymer concrete water-retaining agent and preparation method thereof Download PDFInfo
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- CN116023578B CN116023578B CN202310130529.4A CN202310130529A CN116023578B CN 116023578 B CN116023578 B CN 116023578B CN 202310130529 A CN202310130529 A CN 202310130529A CN 116023578 B CN116023578 B CN 116023578B
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- water
- retaining agent
- deionized water
- retaining
- polymer polyester
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- 239000004567 concrete Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000008367 deionised water Substances 0.000 claims abstract description 31
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 31
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 17
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011391 polyester concrete Substances 0.000 claims abstract description 16
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 14
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 12
- 239000012986 chain transfer agent Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 62
- 238000003756 stirring Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 12
- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical group [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 claims description 12
- -1 polyol ester Chemical class 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims 1
- 230000000740 bleeding effect Effects 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 abstract description 2
- 238000005303 weighing Methods 0.000 description 20
- 230000000694 effects Effects 0.000 description 15
- 206010016807 Fluid retention Diseases 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000002253 acid Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of concrete water-retaining agents, and discloses a polymer polyester concrete water-retaining agent and a preparation method thereof, wherein the polymer polyester concrete water-retaining agent comprises potassium permanganate, oxalic acid, sulfuric acid, methyl acrylate, hydroxyethyl acrylate and a chain transfer agent, and the balance is deionized water; wherein, the methyl acrylate accounts for 6.45 to 6.80 percent by mass, and the hydroxyethyl acrylate accounts for 2.25 to 6.50 percent by mass; during preparation, the raw materials are respectively dissolved in deionized water, then are mixed in a dropwise adding mode, and are cured to obtain the polymer polyester concrete water-retaining agent. The polymer polyester concrete water-retaining agent has good water retention property at the early stage and the later stage of concrete pre-mixing, avoids the problem of bleeding and bleeding, and is re-stirred after being placed for a long time, and the situation of segregation and bleeding is avoided.
Description
Technical Field
The invention relates to the technical field of concrete water-retaining agents, in particular to a polymer polyester concrete water-retaining agent and a preparation method thereof.
Background
In the use process of the concrete, the components in the concrete are required to keep good uniformity, but the quality fluctuation of the used base materials is large, the gradation is not ideal, and the concrete often has the phenomenon of bleeding slurry, so that water and stone are separated, and even the normal construction and the concrete strength are influenced. Currently, the method for solving the problems is to add a water-retaining agent when pre-mixing concrete so as to enhance the water locking capability of the concrete.
At present, the water-retaining agent applied to concrete mainly comprises polyacrylic acid. However, the polyacrylic acid water-retaining agent is acidic, and can be neutralized and adsorbed along with the hydration of cement after being mixed with the cement, so that the water-retaining effect is lost; if the water retention effect is enhanced by increasing the mixing amount, the problems of excessive viscosity, rapid slump loss and the like of the concrete are caused. That is, although the water-retaining agent can exert an obvious water-retaining effect in the early stage of concrete pre-mixing, the water-retaining agent is too fast in loss and not durable in water-retaining effect, bleeding secret slurry can occur again after stirring for a period of time, and practical use requirements cannot be met.
Disclosure of Invention
The invention aims to solve the technical problems that:
at present, the common water-retaining agent has the problem that the water-retaining effect is not durable when in use. Specifically, when the water-retaining agent and the concrete are in a pre-mixing initial stage, the water-retaining agent can play an obvious water-retaining effect, but with the promotion of cement hydration and other processes, the loss of the water-retaining agent begins to occur, the water-retaining effect is obviously reduced, and the problem that the concrete still bleeds and bleeds in a post-mixing stage is caused.
The invention adopts the technical scheme that:
the invention provides a polymer polyester concrete water-retaining agent which comprises potassium permanganate, oxalic acid, sulfuric acid, methyl acrylate, hydroxyethyl acrylate and a chain transfer agent, and the balance of deionized water; wherein, the methyl acrylate accounts for 6.45 to 6.80 percent and the hydroxyethyl acrylate accounts for 2.25 to 6.50 percent by mass percent.
Preferably, the chain transfer agent is sodium methacrylate; further, the sodium methallyl sulfonate accounts for 0.09-0.18% by mass percent.
The invention also provides a preparation method of the polymer polyester concrete water-retaining agent, which comprises the following steps:
s1, oxalic acid, sulfuric acid and methyl acrylate are taken and dissolved in deionized water to prepare a base material;
s2, dissolving sodium methacrylate and hydroxyethyl acrylate in deionized water to prepare a material A;
s3, dissolving potassium permanganate in deionized water to prepare a material B;
and S4, taking the bottom materials, stirring, dripping the materials A and B while stirring, and curing to obtain the water-retaining agent.
Preferably, in the step S1, oxalic acid is dissolved in deionized water, stirred uniformly, sulfuric acid and methyl acrylate are added, and stirred and dissolved; wherein the stirring speed is 320-380r/min.
Preferably, in the step S4, the material A and the material B are added dropwise at the same time, the total adding time of the material A is 140-160min, the total adding time of the material B is 155-175min, and the curing time is 100-135min after the material B is added dropwise.
The invention has the beneficial effects that:
the invention comprises methyl acrylate and hydroxyethyl acrylate, and adopts polybasic ester as one of the key raw material components of the water-retaining agent, wherein the polybasic ester is gradually hydrolyzed in the use process, water is continuously replenished into concrete, the water-retaining agent is prevented from being consumed too quickly in the earlier stage of pre-mixing, the concrete has good water retention in the reinitiation state and in the later stage of mixing, and the concrete is re-stirred after being placed for a long time, and has no segregation bleeding condition.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention provides a polymer polyester concrete water-retaining agent which comprises, by mass, 0.3-0.7 part of potassium permanganate, 1-1.5 parts of oxalic acid, 0.8-1 part of sulfuric acid, 25-35 parts of methyl acrylate, 10-30 parts of hydroxyethyl acrylate, 0.4-1 part of sodium methacrylate and 380-420 parts of deionized water.
In the invention, the water-retaining agent for the polymer polyester concrete is prepared by the following method:
(1) Firstly, oxalic acid, sulfuric acid and methyl acrylate are dissolved in deionized water to prepare a base material; then sodium methacrylate and hydroxyethyl acrylate are dissolved in deionized water to prepare a material A; then dissolving potassium permanganate in deionized water to prepare a material B;
(2) And (3) dropwise adding the material A and the material B into the base material in a dropwise adding mode, stirring, and curing for about 120min to obtain the polymer polyester concrete water-retaining agent.
The water retaining agent for the polymer polyester concrete has stable water retaining effect and can play a role in retaining water in the whole process of concrete stirring.
< example >
Example 1
Preparing a base material: weighing 1.3g of oxalic acid and 300g of deionized water, adding the mixture into a 1000mL four-necked flask, setting the rotating speed to be 350r/min, starting stirring, weighing 30g of methyl acrylate and 0.9g (0.5 mol/L) of sulfuric acid, and adding the mixture into the four-necked flask in a stirring state;
preparing a material A: weighing 30g of hydroxyethyl acrylate, 0.8g of sodium methacrylate and 60g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
and (3) preparing a material B: weighing 0.5g of potassium permanganate and 40g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
the dripping time of the material A is 150min, the dripping time of the material B is 165min, the material AB is started to be dripped, and the material B is continuously stirred and cured for 120min after the dripping is finished.
Example 2
Preparing a base material: weighing 1.3g of oxalic acid and 300g of deionized water, adding the mixture into a 1000mL four-necked flask, setting the rotating speed to be 350r/min, starting stirring, weighing 30g of methyl acrylate and 0.9g (0.5 mol/L) of sulfuric acid, and adding the mixture into the four-necked flask in a stirring state;
preparing a material A: weighing 20g of hydroxyethyl acrylate, 0.8g of sodium methacrylate and 60g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
and (3) preparing a material B: weighing 0.5g of potassium permanganate and 40g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
the dripping time of the material A is 150min, the dripping time of the material B is 165min, the material AB is started to be dripped, and the material B is continuously stirred and cured for 120min after the dripping is finished.
Example 3
Preparing a base material: weighing 1.3g of oxalic acid and 300g of deionized water, adding the mixture into a 1000mL four-necked flask, setting the rotating speed to be 350r/min, starting stirring, weighing 30g of methyl acrylate and 0.9g (0.5 mol/L) of sulfuric acid, and adding the mixture into the four-necked flask in a stirring state;
preparing a material A: weighing 10g of hydroxyethyl acrylate, 0.8g of sodium methacrylate and 60g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
and (3) preparing a material B: weighing 0.5g of potassium permanganate and 40g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
the dripping time of the material A is 150min, the dripping time of the material B is 165min, the material AB is started to be dripped, and the material B is continuously stirred and cured for 120min after the dripping is finished.
Example 4
Preparing a base material: weighing 1.3g of oxalic acid and 300g of deionized water, adding the mixture into a 1000mL four-necked flask, setting the rotating speed to be 350r/min, starting stirring, weighing 30g of methyl acrylate and 0.9g (0.5 mol/L) of sulfuric acid, and adding the mixture into the four-necked flask in a stirring state;
preparing a material A: weighing 20g of hydroxyethyl acrylate, 0.6g of sodium methacrylate and 60g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
and (3) preparing a material B: weighing 0.5g of potassium permanganate and 40g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
the dripping time of the material A is 150min, the dripping time of the material B is 165min, the material AB is started to be dripped, and the material B is continuously stirred and cured for 120min after the dripping is finished.
Example 5
Preparing a base material: weighing 1.3g of oxalic acid and 300g of deionized water, adding the mixture into a 1000mL four-necked flask, setting the rotating speed to be 350r/min, starting stirring, weighing 30g of methyl acrylate and 0.9g (0.5 mol/L) of sulfuric acid, and adding the mixture into the four-necked flask in a stirring state;
preparing a material A: weighing 20g of hydroxyethyl acrylate, 0.4g of sodium methacrylate and 60g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
and (3) preparing a material B: weighing 0.5g of potassium permanganate and 40g of deionized water, placing into a 100mL conical flask, and shaking uniformly for later use;
the dripping time of the material A is 150min, the dripping time of the material B is 165min, the material AB is started to be dripped, and the material B is continuously stirred and cured for 120min after the dripping is finished.
< test example >
(1) The water-retaining agents prepared in examples 1 to 5 were used as samples, the viscosity and other properties of the samples were measured, and the measurement results were recorded and summarized as shown in Table 1 below:
table 1 sample performance parameters
| Sample of | Viscosity (mpa.s) | pH value of | Chloride ion content (mol/L) |
| Example 1 | 323 | 2.2 | 0.0012 |
| Example 2 | 320 | 2.2 | 0.0011 |
| Example 3 | 306 | 2.2 | 0.0011 |
| Example 4 | 431 | 2.9 | 0.0013 |
| Example 5 | 597 | 3.1 | 0.0011 |
According to the performance parameters of the samples counted in the table 1, the viscosity (mpa.s) of the water-retaining agents obtained in the examples 1-5 are all 300-600, and the water-retaining agents are not affected to be pumped in the production and use processes; the pH value is between 2.2 and 3.1, and the chloride ion content is between 0.0011 and 0.0013, so that the slump retaining property and the like of the concrete are not adversely affected.
(2) The water retention agents prepared in examples 1 to 5 and the existing polycarboxylic acid water retention agent were taken as samples, the samples were added to concrete, and the concrete was adjusted to the state of initial bleeding and post-bleeding, and the water retention conditions of the concrete at different times were observed and recorded as in table 2 below. Wherein, according to the water retention effect, the three grades of "good", "medium", "bad" are divided:
table 3 Water retention of samples
| Sample of | Initial time of day | 60min | 120min |
| Example 1 | Good (good) | Medium and medium | Difference of difference |
| Example 2 | Medium and medium | Medium and medium | Difference of difference |
| Example 3 | Medium and medium | Medium and medium | Medium and medium |
| Example 4 | Medium and medium | Good (good) | Good (good) |
| Example 5 | Difference of difference | Difference of difference | Medium and medium |
| Polycarboxylic acid water-retaining agent | Good (good) | Difference of difference | Difference of difference |
From the results of the measurement of the water retention effect of the samples in table 2 above, it can be found that: compared with the existing polycarboxylic acid water-retaining agent, the water-retaining agents prepared in examples 1-5 have slightly inferior water-retaining effect at the initial time; however, the polycarboxylate water reducer loses the original water-retaining effect in a very short time, and the water-retaining agent in examples 1 to 5 can still maintain the effective water-retaining effect after 60 minutes, and has remarkable water-retaining effect in the later period and good effect stability.
(3) The water-retaining agents in examples 1 to 5 were taken as samples, and the properties of the samples after different standing times were measured, respectively, and summarized in the following Table 3:
TABLE 3 stability of samples at different standing times
From the summary of the stability of the samples at different times of placement in table 3 above, it can be shown that: the water retention agent in examples 1-5 can be placed for about 60d under normal conditions, and the state of the water retention agent is stable during the period, and the efficacy is not changed or failed obviously.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The water-retaining agent for the polymer polyester concrete is characterized by comprising potassium permanganate, oxalic acid, sulfuric acid, methyl acrylate, hydroxyethyl acrylate and a chain transfer agent, and the balance being deionized water;
wherein, the methyl acrylate accounts for 6.45 to 6.80 percent by mass, and the hydroxyethyl acrylate accounts for 2.25 to 6.50 percent by mass;
the chain transfer agent is sodium methacrylate, and the sodium methacrylate accounts for 0.09-0.18% by mass percent.
2. A method for preparing the polymer polyester concrete water-retaining agent as claimed in claim 1, comprising the following steps:
s1, oxalic acid, sulfuric acid and methyl acrylate are taken and dissolved in deionized water to prepare a base material;
s2, dissolving sodium methacrylate and hydroxyethyl acrylate in deionized water to prepare a material A;
s3, dissolving potassium permanganate in deionized water to prepare a material B;
and S4, taking the bottom materials, stirring, dripping the materials A and B while stirring, and curing to obtain the water-retaining agent.
3. The method for preparing a water-retaining agent for polymer polyol ester concrete according to claim 2, wherein in the step S1, oxalic acid is dissolved in deionized water, stirred uniformly, sulfuric acid and methyl acrylate are added and stirred and dissolved.
4. The method for preparing a water-retaining agent for polymer polyester concrete according to claim 3, wherein the stirring speed is 320-380r/min.
5. The method for preparing the water-retaining agent for the polymer polyester concrete according to claim 2, wherein in the step S4, the material A and the material B are added dropwise at the same time, the total adding time of the material A is 140-160min, the total adding time of the material B is 155-175min, and curing is started after the adding of the material B is finished.
6. The method for preparing a water-retaining agent for polymer polyester concrete according to claim 5, wherein the curing time period is 100-135min in the step S4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310130529.4A CN116023578B (en) | 2023-02-17 | 2023-02-17 | Polyesterpolymer concrete water-retaining agent and preparation method thereof |
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| CN202310130529.4A CN116023578B (en) | 2023-02-17 | 2023-02-17 | Polyesterpolymer concrete water-retaining agent and preparation method thereof |
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| CN116023578A CN116023578A (en) | 2023-04-28 |
| CN116023578B true CN116023578B (en) | 2024-01-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183065A (en) * | 2001-10-09 | 2003-07-03 | Mitsubishi Rayon Co Ltd | Concrete for greening |
| CN109369860A (en) * | 2018-11-01 | 2019-02-22 | 中建材中岩科技有限公司 | It is sustained controllable type polycarboxylate superplasticizer mother liquor and preparation method thereof |
| CN111533844A (en) * | 2020-06-04 | 2020-08-14 | 江苏万邦新材料科技有限公司 | Modified concrete water-retaining agent and preparation method thereof |
| CN113292686A (en) * | 2020-12-30 | 2021-08-24 | 云南森博混凝土外加剂有限公司 | Multifunctional concrete water-retaining agent and preparation method thereof |
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- 2023-02-17 CN CN202310130529.4A patent/CN116023578B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183065A (en) * | 2001-10-09 | 2003-07-03 | Mitsubishi Rayon Co Ltd | Concrete for greening |
| CN109369860A (en) * | 2018-11-01 | 2019-02-22 | 中建材中岩科技有限公司 | It is sustained controllable type polycarboxylate superplasticizer mother liquor and preparation method thereof |
| CN111533844A (en) * | 2020-06-04 | 2020-08-14 | 江苏万邦新材料科技有限公司 | Modified concrete water-retaining agent and preparation method thereof |
| CN113292686A (en) * | 2020-12-30 | 2021-08-24 | 云南森博混凝土外加剂有限公司 | Multifunctional concrete water-retaining agent and preparation method thereof |
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