CN104496257A - Polycarboxylate superplasticizer with excellent slump retention, higher water-reducing rate and capable of perfecting concrete performance and preparation method thereof - Google Patents
Polycarboxylate superplasticizer with excellent slump retention, higher water-reducing rate and capable of perfecting concrete performance and preparation method thereof Download PDFInfo
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- CN104496257A CN104496257A CN201410824448.5A CN201410824448A CN104496257A CN 104496257 A CN104496257 A CN 104496257A CN 201410824448 A CN201410824448 A CN 201410824448A CN 104496257 A CN104496257 A CN 104496257A
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Abstract
The invention discloses a polycarboxylate superplasticizer with excellent slump retention, higher water-reducing rate and capable of perfecting concrete performance. The polycarboxylate superplasticizer is characterized by being prepared from the following components in parts by weight: 30-40 parts of methyl allyl polyethenoxy ether, 10-20 parts of self-made additives, 10-20 parts of methacrylic acid, 1-5 parts of mercaptoacetic acid, 1-5 parts of caustic soda flakes and 40-60 parts of water. The polycarboxylate superplasticizer disclosed by the invention has the advantages of reducing the water cement ratio, increasing the fluidity, perfecting the compaction rate of concrete, saving cement, perfecting the working performance of the concrete and improving the strength and durability of the concrete.
Description
Technical field
The present invention relates to technical field of concrete, be specifically related to a kind of slump retaining (flowing degree of net paste of cement initially arrives 60min from 260-255mm) with excellence, higher water-reducing rate (30%), polycarboxylate water-reducer improving concrete performance and preparation method thereof.
Background technology
Along with the needs of development, concrete technology and consumption require more and more higher, and concrete strictly will control its shrinkage cracking rate in use procedure, prevents potential safety hazard; The form of adding admixture such as water reducer is adopted at present to damage the high problem of the shrinkage cracking rate that causes to overcome concrete slump in order to solve the problems of the technologies described above; The development experience of water reducer lignin sulfonic acid salt water reducer, naphthalene water reducer, poly carboxylic acid series water reducer etc.
Polycarboxylic acids dehydragent has that volume is low, water-reducing rate is high, good with other materials compatibility such as cement, dispersion retention and the good advantage of slump retention performance.But these traditional water reducers are as high in polyester type and polyether-type water reducer still exist water cement ratio, and concrete degree of mobilization is low, compaction rate is little, cement consumption is large, the deficiency of concrete intensity and poor durability.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, one is provided to reduce water cement ratio, increase degree of mobilization, improve concrete compaction rate, save cement, improve concrete work performance, improve the slump retaining with excellence of concrete intensity and weather resistance, higher water-reducing rate, improves the polycarboxylate water-reducer of concrete performance.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of have excellent slump retaining, and higher water-reducing rate, improves the polycarboxylate water-reducer of concrete performance, and this water reducer is prepared from by each component of following weight part:
As preferably, have excellent slump retaining, higher water-reducing rate, improves the polycarboxylate water-reducer of concrete performance, and this water reducer is prepared from by each component of following weight part:
Described self-control auxiliary component of the present invention and consumption are:
The present invention also discloses a kind of above-mentioned slump retaining with excellence, higher water-reducing rate, and improve the preparation method of the polycarboxylate water-reducer of concrete performance, preparation process comprises:
(1) each component raw material of formula rate is taken;
(2) water of formula rate half is warmed up to 25-35 DEG C, then add methyl thiazolinyl Soxylat A 25-7 and self-control auxiliary agent, warming while stirring is to 48-52 DEG C;
(3) by the material of step (2) after 48-52 DEG C of stirring reaction 0.5-1.5 hour, in reaction system, drip the solution that second half water of methacrylic acid, Thiovanic acid and formula rate is prepared, the time for adding of above-mentioned solution completed in 3.5-4.5 hour;
(4) reaction system of step (3) is maintained 48-52 DEG C of insulation 0.5-2 hour, then cool to 25-35 DEG C and add sheet alkali and stir, obtain a kind of white liquid and be polycarboxylate water-reducer of the present invention.
Advantage of the present invention and beneficial effect:
1. the present invention adopts in formula, adds the raw material such as methyl thiazolinyl Soxylat A 25-7, self-control auxiliary agent, can realize reducing water cement ratio, increase degree of mobilization, improve concrete compaction rate, save cement, improve concrete work performance, improve the advantage of concrete intensity and weather resistance.The addition of the present invention's Thiovanic acid is wherein very crucial, the present invention adopts 1-5 weight part, coordinate with the methyl thiazolinyl Soxylat A 25-7 of 30-40 weight part, thus the molecule relative mass of the water reducer effectively prepared, the present invention selects specific Thiovanic acid weight and consumption, wide based on the excessive molecular weight distribution caused of control molecule relative mass just, prevent from being cross-linked, if add-on too much can cause molecular weight on the low side, thus makes polycarboxylate water-reducer deleterious, paste flowing degree diminishes, if add-on is very few, can cause molecular weight higher cause crosslinked, the present invention selects homemade auxiliary agent, it fully can dissolve with raw materials such as methyl thiazolinyl Soxylat A 25-7s and contact, make reaction more abundant, thoroughly, yield is high, and stable carboxyl can be provided, the anion clusters such as acidic group, negative charge in group will interact with the positive charge of cement particle surface, make water reducer molecule firmly be adsorbed on cement particle surface and form one deck electric double layer, thus cement surface is with identical electric charge, must mutually repel each other, cement granules will spread out, its flucculation structure skin is bad, the free water molecule of the inside parcel is released and participates in circulation, thus effectively increase concrete mix obtains mobility, thus effectively reduce concrete shrinkage cracking rate, postpone its damage speed of collapsing, and the later stage can increase the advantage of protecting function of collapsing.
2. method of the present invention, by strictly controlling the order of addition of various material and interpolation time and temperature of reaction, realize effectively reducing concrete shrinkage cracking rate, reducing water cement ratio, increase degree of mobilization, improve concrete compaction rate, save cement, improve concrete work performance, improve the advantage of concrete intensity and weather resistance, such as strictly control the control mode of time for adding and dropping order, this is because water reducer is the uniform polymerization reaction take place of each monomer in the state that polymerization process is desirable, but the speed of the reactive behavior of often kind of monomer and participation polyreaction is all different, in order to avoid uneven polymerization, adopt the control of mode and the time for adding progressively dripped, the desirable polymerization state of the control of maximum possible thus ensure that cement has better paste flowing degree, therefore the present invention adopts and " in reaction system, drips methacrylic acid, the solution that second half water of Thiovanic acid and formula rate is prepared, the time for adding of above-mentioned solution completed in 3.5-4.5 hour " dropping mode, achieve better technique effect, such as temperature of the present invention controls also very crucial, and it plays very crucial effect to chain initiation, and temperature low reaction activity is low, then polymerization rate is low, and reactant molecule amount is little and reaction is incomplete, causes wastage of material, if temperature is too high, the speed of polyreaction increases severely, be unfavorable for homogeneous polymerization, so for the raw material of special formulation of the present invention, strictly control temperature of reaction 48-52 DEG C and reaction times.
Embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
Embodiment 1
Proportioning raw materials:
Methyl thiazolinyl Soxylat A 25-7 35 parts, self-control auxiliary agent 15 parts, methacrylic acid 15 parts, Thiovanic acid 2 parts, 2 parts, sheet alkali, 45 parts, water.
Self-control auxiliary agent: vinylformic acid 15%, ammonium persulphate 5%, water 80%.
Preparation process comprises: (1) takes each component raw material of formula rate; (2) water of formula rate half is warmed up to 25-35 DEG C, then add methyl thiazolinyl Soxylat A 25-7 and self-control auxiliary agent, warming while stirring is to 50 DEG C; (3) by the material of step (2) at 50 DEG C of stirring reactions after 1 hour, in reaction system, drip the solution that second half water of methacrylic acid, Thiovanic acid and formula rate is prepared, the time for adding of above-mentioned solution completed in 4 hours; (4) reaction system of step (3) is maintained 50 DEG C of insulations 1 hour, then cool to 30 DEG C and add sheet alkali and stir, obtain a kind of white liquid and be polycarboxylate water-reducer.
Embodiment 2
Proportioning raw materials: methyl thiazolinyl Soxylat A 25-7 40 parts, self-control auxiliary agent 10 parts, methacrylic acid 20 parts, Thiovanic acid 5 parts, 5 parts, sheet alkali, 50 parts, water.
Auxiliary agent processed: vinylformic acid 20%, ammonium persulphate: 10%, water 70%.
Preparation method is with embodiment 1.
Embodiment 3
Methyl thiazolinyl Soxylat A 25-7 32 parts, self-control auxiliary agent 20 parts, methacrylic acid 20 parts, Thiovanic acid 4 parts,
2 parts, sheet alkali, 55 parts, water.
Self-control auxiliary agent: vinylformic acid 16%, ammonium persulphate 8%, water 76%.
Preparation method is with embodiment 1.
The Performance Detection of the water reducer of preparation
Measure the paste flowing degree of cement with reference to GB8077-2000 " Methods for testing uniformity of concrete admixture ", water cement ratio is 0.25, and the volume of water reducer is 0.15% (in cement consumption quality, folding is solid); P.042.5 cement be.
Concrete slump retaining ability
For table 1 proportioning concrete:
Table 1
Water reducer affects concrete performance, specifically in table 2:
As can be known from the above table, be 0.3% at volume, when water cement ratio is 0.25, flowing degree of net paste of cement is from initially slightly increasing to 30min, decline also not obvious to 60min, surperficial water reducer of the present invention has the dispersing property of two Kazakhstan, and high specific of the rate that slows down, concrete good mechanical property simultaneously, intensity stabilization.
The above embodiment of the present invention can not be used for limiting the present invention to explanation of the present invention, and any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (4)
1. have excellent slump retaining, higher water-reducing rate, improve the polycarboxylate water-reducer of concrete performance, it is characterized in that, this water reducer is prepared from by each component of following weight part:
2. according to claim 1ly have excellent slump retaining, higher water-reducing rate, improve the polycarboxylate water-reducer of concrete performance, it is characterized in that, this water reducer is prepared from by each component of following weight part:
3. according to claim 1 and 2ly have excellent slump retaining, higher water-reducing rate, improve the polycarboxylate water-reducer of concrete performance, it is characterized in that, described self-control auxiliary component and consumption are:
4. have excellent slump retaining, higher water-reducing rate, improve the preparation method of the polycarboxylate water-reducer of concrete performance, it is characterized in that, preparation process comprises:
(1) each component raw material of formula rate is taken;
(2) water of formula rate half is warmed up to 25-35 DEG C, then add methyl thiazolinyl Soxylat A 25-7 and self-control auxiliary agent, warming while stirring is to 48-52 DEG C;
(3) by the material of step (2) after 48-52 DEG C of stirring reaction 0.5-1.5 hour, in reaction system, drip second half the solution of water mixed preparing of methacrylic acid, Thiovanic acid and formula rate, the time for adding of above-mentioned solution completed in 3.5-4.5 hour;
(4) reaction system of step (3) is maintained 48-52 DEG C of insulation 0.5-2 hour, then cool to 25-35 DEG C and add sheet alkali and stir, obtain a kind of white liquid and be polycarboxylate water-reducer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1655272A1 (en) * | 2004-11-04 | 2006-05-10 | Mapei S.p.A. | Superplasticizers for extending the workability of mortars |
| CN101928114A (en) * | 2010-08-30 | 2010-12-29 | 大连建科北方化学有限公司 | High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof |
| CN102030494A (en) * | 2010-11-12 | 2011-04-27 | 河北金舵建材科技开发有限公司 | High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof |
| CN104140503A (en) * | 2014-07-30 | 2014-11-12 | 江西格雷斯科技股份有限公司 | Method for synthesizing high-water-reduction high-slump-retaining high-performance polycarboxylate water reducer at normal temperature |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1655272A1 (en) * | 2004-11-04 | 2006-05-10 | Mapei S.p.A. | Superplasticizers for extending the workability of mortars |
| CN101928114A (en) * | 2010-08-30 | 2010-12-29 | 大连建科北方化学有限公司 | High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof |
| CN102030494A (en) * | 2010-11-12 | 2011-04-27 | 河北金舵建材科技开发有限公司 | High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof |
| CN104140503A (en) * | 2014-07-30 | 2014-11-12 | 江西格雷斯科技股份有限公司 | Method for synthesizing high-water-reduction high-slump-retaining high-performance polycarboxylate water reducer at normal temperature |
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Inventor after: Wu Jiandong Inventor after: Xiao Yanfei Inventor after: Chen Dawei Inventor after: Zhou Youbin Inventor after: Zhou Jingping Inventor before: Wu Jiandong Inventor before: Zhou Yujun Inventor before: Xiao Yanfei Inventor before: Chen Dawei Inventor before: Zhou Youbin Inventor before: Zhou Jingping |
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