CN103819121A - Concrete thickening and water-retaining agent and preparation method thereof - Google Patents
Concrete thickening and water-retaining agent and preparation method thereof Download PDFInfo
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- CN103819121A CN103819121A CN201410024130.9A CN201410024130A CN103819121A CN 103819121 A CN103819121 A CN 103819121A CN 201410024130 A CN201410024130 A CN 201410024130A CN 103819121 A CN103819121 A CN 103819121A
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Abstract
The invention relates to an admixture for concrete and a preparation method thereof, in particular to a concrete thickening and water-retaining agent and a preparation method thereof. The concrete thickening and water-retaining agent is a sodium acrylate-acrylamide copolymer with high molecular weight prepared from polyacrylamide subjected to a hydrolysis reaction via a hydrolyst in water. The concrete thickening and water-retaining agent comprises the following raw materials in percentage by weight: 10 percent of polyacrylamide, 8 percent of the hydrolyst and 82 percent of water. The concrete thickening and water-retaining agent disclosed by the invention has favorable compatibility with a polycarboxylate superplasticizer and is free from precipitation and separation in a polycarboxylic acid master batch; the bleeding of the concrete can be effectively inhibited, the encapsulation and the cohesiveness of the concrete are improved and the peaceability of the concrete can be improved. The concrete thickening and water-retaining agent is an excellent aid for configuring the concrete admixture.
Description
Technical field
The present invention relates to the reinforcement of concrete admixture and preparation method, specifically, relate to a kind of concrete thickening water-holding agent and preparation method thereof.
Background technology
Concrete workability is a comprehensive technical feature, and it is to weigh the most important index of concrete construction performance, generally includes mobility, water-retentivity and three aspects of cohesiveness.
1, concrete flowability refers to that fresh concrete, under deadweight or mechanical effect of vibrating, can produce and flow, and the performance of evenly filling up densely mould.Major influence factors is water reducer consumption and water consumption.
2, cohesiveness refers between the composition material of fresh concrete certain cohesion, and in construction process, slurry homogeneous, the performance of layering and segregation phenomenon does not occur.The homogeneity of cohesiveness reflection concrete mix.If concrete mix cohesiveness is bad, in concrete, gather materials and separate with grout is easy, cause concrete inhomogeneous, after vibrating, there will be the phenomenon such as honeycomb and cavity.
3, water-retentivity refers at fresh concrete and has certain water retention capacity, in construction process, and the not performance of bleeding.The stability of water-retentivity reflection concrete mix.The inside concrete of poor water retention property easily forms water-permeable passage, affects concrete density, and reduces concrete intensity and weather resistance.
Improve concrete parcel property, cohesiveness and water-retentivity and generally all use thickening material, by sources difference is roughly divided three classes: 1, natural product, mainly contain gelatin, xanthan gum, warm human relations glue, melon glue etc.; 2, sintetics, mainly contains polyvinyl alcohol, polyacrylamide, EVA rubber powder, sodium polyacrylate etc.; 3, mineral colloid, mainly contains alum, Tai-Ace S 150 etc.
The subject matter of existing thickening material is all immiscible with polycarboxylate water-reducer except inorganics, precipitation or separate out in polycarboxylate water-reducer, and still, the sodium polyacrylate molecular weight that existing synthesis method is produced is on the low side and cannot meet the demands again.
Summary of the invention
The object of the invention is to, a kind of concrete thickening water-holding agent and preparation method thereof is provided, to solve above-mentioned technical problem.
The present invention is achieved through the following technical solutions:
A kind of concrete thickening water-holding agent, is characterized in that: this thickening water-holding agent is high-molecular-weight propylene acid sodium-acrylamide copolymer of being made up through the hydrolysis reaction of hydrolyst in water of polyacrylamide; The usage percentage of described various raw materials is respectively: polyacrylamide 10%, hydrolyst 8%, water 82%; The repeating unit of this thickening water-holding agent and molecular formula can be represented by following general formula:
Wherein, m=2.4 × 10
4～11.2 × 10
4, n=0.6 × 10
4～3.8 × 10
4.
The preparation method of described concrete thickening water-holding agent, concrete steps are: first in conversion unit, add water, open and stir, continue to add polyacrylamide; Then, in conversion unit, slowly add hydrolyst, and be warming up to 95 ℃; Fully reaction, after 3 hours, is cooled to 45 ℃, and discharging, is concrete thickening water-holding agent finished product.
Polyacrylamide is that naphthalene is the good thickening water-retaining components such as pumping agent or frostproofer, solid additive, mortar auxiliary agent, but polyacrylamide and poly carboxylic acid do not dissolve each other, and in polycarboxylate water-reducer, polyacrylamide precipitation, separates out; In order to improve the consistency of it and polycarboxylate water-reducer, the present invention has taked the scheme of partial hydrolysis neutralization; Along with the rising of Molecular Weight for Polyacrylamide, the viscosity of its aqueous solution and concrete viscosity are all increasing, and water retention property increases.
say further:
The molecular weight of described polyacrylamide be between 3 × 10
6～14 × 10
6.
What described hydrolyst adopted is that concentration is 30% sodium hydroxide solution.The addition elimination reaction that acid or alkali can catalysis acid amides in theory, is used alkali can save neutralization procedure; Using liquid base is that solid alkali should not dissolve because the viscosity of reaction system is larger.
beneficial effect:the concrete thickening water-holding agent that adopts the present invention to prepare is to be hydrolyzed by high molecular weight polypropylene acid amide the high-molecular-weight propylene acid sodium-acrylamide copolymer forming, molecular weight can reach 1,400 ten thousand, there is good consistency with polycarboxylate water-reducer, in poly carboxylic acid masterbatch, do not precipitate, do not separate out, can effectively suppress concrete bleeding, promoting concrete parcel property and cohesiveness, can improve concrete workability, is the good auxiliary agent of configuration concrete admixture.
embodiment
Below with reference to specific embodiment, the present invention is described further.
embodiment 1
In the there-necked flask of capacity 1000ml, add 820g water, open and stir, continue to add 100g molecular weight>=3 × 10
6polyacrylamide, slowly adding 80g concentration is 30% liquid caustic soda, is warming up to 95 ℃, reacts 3 hours, is cooled to 45 ℃, discharging, is concrete thickening water-holding agent finished product.
embodiment 2
In the there-necked flask of capacity 1000ml, add 820g water, open and stir, continue to add 100g molecular weight>=6 × 10
6polyacrylamide, slowly adding 80g concentration is 30% liquid caustic soda, is warming up to 95 ℃, reacts 3 hours, is cooled to 45 ℃, discharging, is concrete thickening water-holding agent finished product.
embodiment 3
In the there-necked flask of capacity 1000ml, add 820g water, open and stir, continue to add 100g molecular weight>=8 × 10
6polyacrylamide, slowly adding 80g concentration is 30% liquid caustic soda, is warming up to 95 ℃, reacts 3 hours, is cooled to 45 ℃, discharging, is concrete thickening water-holding agent finished product.
embodiment 4
In the there-necked flask of capacity 1000ml, add 820g water, open and stir, continue to add 100g molecular weight≤14 × 10
6polyacrylamide, slowly adding 80g concentration is 30% liquid caustic soda, is warming up to 95 ℃, reacts 3 hours, is cooled to 45 ℃, discharging, is concrete thickening water-holding agent finished product.
above-mentioned 4 embodiment and the experiment of polycarboxylate water-reducer consistency are as follows:
In the polycarboxylate water-reducer solution that is 10% in concentration, add 3 ‰ samples, stir 30min, latter standing 48 hours, result was as shown in the table:
| Sample | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Polyacrylamide | Polyvinyl alcohol |
| Solvability | Clear | Clear | Clear | Clear | There is sheet insolubles to separate out | There is transparent jelly precipitation |
the concrete water bleeding rate test of above-mentioned 4 embodiment is as follows:
Test by GB8076-2008, sample volume 3/100000ths, result is as shown in the table:
| Sample | Blank concrete | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Polyacrylamide | Polyvinyl alcohol |
| Pressured bleeding | 80％ | 10％ | 5％ | ―― | ―― | 5％ | 5％ |
Claims (4)
1. a concrete thickening water-holding agent, is characterized in that: this thickening water-holding agent is high-molecular-weight propylene acid sodium-acrylamide copolymer of being made up through the hydrolysis reaction of hydrolyst in water of polyacrylamide; The usage percentage of described various raw materials is respectively: polyacrylamide 10%, hydrolyst 8%, water 82%; The repeating unit of this thickening water-holding agent and molecular formula can be represented by following general formula:
Wherein, m=2.4 × 10
4～11.2 × 10
4, n=0.6 × 10
4～3.8 × 10
4.
2. the preparation method of concrete thickening water-holding agent as claimed in claim 1, is characterized in that: this thickening water-holding agent is high-molecular-weight propylene acid sodium-acrylamide copolymer of being made up through the hydrolysis reaction of hydrolyst in water of polyacrylamide; The usage percentage of described various raw materials is respectively: polyacrylamide 10%, hydrolyst 8%, water 82%; Concrete steps are: first in conversion unit, add water, open and stir, continue to add high molecular weight polyacrylamide; Then, in conversion unit, slowly add hydrolyst, and be warming up to 95 ℃; Fully reaction, after 3 hours, is cooled to 45 ℃, and discharging, is concrete thickening water-holding agent finished product.
3. the preparation method of concrete thickening water-holding agent according to claim 2, is characterized in that: the molecular weight of described polyacrylamide be between 3 × 10
6～14 × 10
6.
4. the preparation method of concrete thickening water-holding agent according to claim 2, is characterized in that: what described hydrolyst adopted is that concentration is 30% sodium hydroxide solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410024130.9A CN103819121A (en) | 2014-01-20 | 2014-01-20 | Concrete thickening and water-retaining agent and preparation method thereof |
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| CN201410024130.9A CN103819121A (en) | 2014-01-20 | 2014-01-20 | Concrete thickening and water-retaining agent and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186981A (en) * | 2016-07-26 | 2016-12-07 | 苏州秉创科技有限公司 | A kind of construction material printed for 3D |
| CN106746878A (en) * | 2016-11-29 | 2017-05-31 | 长沙加美乐素化工有限公司 | A kind of viscosity modifier and preparation method thereof |
| TWI732740B (en) * | 2014-07-10 | 2021-07-11 | 日商信越化學工業股份有限公司 | One-component water-reducing agent, and preparation of hydraulic composition |
| CN113372035A (en) * | 2021-07-23 | 2021-09-10 | 新兴栈(绵阳)建材有限公司 | Anti-segregation agent for concrete and preparation method thereof |
| CN115353319A (en) * | 2022-07-05 | 2022-11-18 | 湖南中岩建材科技有限公司 | Water-retaining agent and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1057059A (en) * | 1990-06-04 | 1991-12-18 | 中国科学院长春应用化学研究所 | The preparation of high molecular anion type polycrylamide |
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2014
- 2014-01-20 CN CN201410024130.9A patent/CN103819121A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057059A (en) * | 1990-06-04 | 1991-12-18 | 中国科学院长春应用化学研究所 | The preparation of high molecular anion type polycrylamide |
Non-Patent Citations (1)
| Title |
|---|
| 李海普等: "《乳液型阳离子聚丙烯酰胺的水解工艺》", 《化学反应工程与工艺》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI732740B (en) * | 2014-07-10 | 2021-07-11 | 日商信越化學工業股份有限公司 | One-component water-reducing agent, and preparation of hydraulic composition |
| CN106186981A (en) * | 2016-07-26 | 2016-12-07 | 苏州秉创科技有限公司 | A kind of construction material printed for 3D |
| CN106746878A (en) * | 2016-11-29 | 2017-05-31 | 长沙加美乐素化工有限公司 | A kind of viscosity modifier and preparation method thereof |
| CN113372035A (en) * | 2021-07-23 | 2021-09-10 | 新兴栈(绵阳)建材有限公司 | Anti-segregation agent for concrete and preparation method thereof |
| CN115353319A (en) * | 2022-07-05 | 2022-11-18 | 湖南中岩建材科技有限公司 | Water-retaining agent and preparation method and application thereof |
| CN115353319B (en) * | 2022-07-05 | 2023-10-13 | 湖南中岩建材科技有限公司 | Water-retaining agent and preparation method and application thereof |
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Application publication date: 20140528 |
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