CN103819627B - Controllable slow release concrete water reducer and preparation method thereof - Google Patents
Controllable slow release concrete water reducer and preparation method thereof Download PDFInfo
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- CN103819627B CN103819627B CN201310740766.9A CN201310740766A CN103819627B CN 103819627 B CN103819627 B CN 103819627B CN 201310740766 A CN201310740766 A CN 201310740766A CN 103819627 B CN103819627 B CN 103819627B
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Abstract
The invention discloses a controllable slow release concrete water reducer and a preparation method thereof. The water reducer provided by the invention is obtained through the steps of mixing and stirring raw materials of methyl propenyl ethanediol, acrylic acid, ethyl acrylate, hydrogen peroxide, L-ascorbic acid, mercaptoacetic acid and a mixture of OP10 and stearic acid, preparing a dripping material, dripping the dripping material under temperature control and the like; the concrete water reducer provided by the invention has high slump retainability, the slump of the concrete does not change along with the time obviously in 2 h, and meanwhile the technological process is simple and easy to operate.
Description
Technical field
The present invention relates to a kind of concrete additive, more particularly, to a kind of controllable sustained-release cement water reducing agent and its preparation side
Method.
Background technology
Water reducer refers to, under concrete workability and cement consumption permanence condition, to reduce mixing water amount, improve and mix
Solidifying soil intensity；Or under workability and intensity permanence condition, save the additive of cement consumption；After cement plus water mix, due to
The effect of cement granules molecular attraction, makes cement mortar form flocculent structure, makes 10%～30% mixing water be wrapped in cement
It is impossible to participate in flowing freely and lubrication among grain, thus have impact on the mobility of concrete mix, when addition water reducer
Afterwards, because diminishing agent molecule energy oriented adsorption is in cement particle surface, cement particle surface is made to carry same electric charge (usually
Negative charge), form electrostatic repulsion, promote cement granules mutually to disperse, flocculent structure is destroyed, and discharges and is wrapped part
Water, participates in flowing, thus effectively increasing the mobility of concrete mix；The sterically hindered effect of water reducer simultaneously makes coagulation
The slump of soil keeps good, and control slump loss.
Cement water reducing agent, through the development of decades, can be divided into three generation products substantially, is with ligninsulfonate respectively
For represent first generation cement water reducing agent, the second filial generation cement water reducing agent with aliphatic as representative and with polycarboxylic acids as generation
The third generation cement water reducing agent of table.From the point of view of current market situation, third generation water reducer excellent performance, it has long-term
Durability；Resistance to chemical corrosion is strong, can be used in various special engineerings；It is provided simultaneously with the basis of high water reducing rate, high intensity
Service behaviour is excellent, easy pumping, the excellent workability such as easily closely knit.But in use, this kind of water reducer it occur frequently that
Pumping difficulties and concrete slump loss is too fast and the phenomenon such as hard soon, control slump loss most common method is to rely on to mix
Plus retarder, but admixture retarder can affect the development of the early strength of concrete, and this is very unfavorable in a lot of occasions.
Content of the invention
Polycarboxylate water-reducer is convenient, safe efficient when using, but also has certain limitation, and its advantage is simply relatively
, its adaptability aspect with cement also there is a problem of certain.It is an object of the invention to provide a kind of stability is more preferable
Controllable sustained-release water reducer and preparation method thereof.Specifically, the present invention is achieved through the following technical solutions:
Described controllable sustained-release cement water reducing agent is made up of the raw material carrying out proportioning by following mol ratio: a methylpropenyl
Polyethylene Glycol: b acrylic acid: c ethyl acrylate=1:1 ~ 2: 2 ~ 4；Described raw material also include weight account for a, b, c weight sum 0.4 ~
0.8% d hydrogen peroxide, weight are 0.4 ~ 0.6% e l- ascorbic acid of d weight, weight accounts for the 0.5 ~ 1.0% of a, b, c weight sum
F Thioglycolic acid and weight is b, c weight sum 5 ~ 15% g, described g is the op10 and stearic acid ratio composition in 1:1
Mixture.
Preferably, in the present invention the molecular weight of described raw material methylpropenyl Polyethylene Glycol is 2000-2400.
Further, described raw material b acrylic acid can be substituted with methacrylic acid in the present invention, mol ratio used with
Acrylic acid is the same.
Further, described raw material c ethyl acrylate can be substituted with propyl acrylate in the present invention, joins for used mole
Than as ethyl acrylate.
Further, in the present invention described raw material f Thioglycolic acid can with dredge base ethyl ester substitute, weight proportion used with
Thioglycolic acid is the same.
In the present invention, the preparation method of described controllable sustained-release cement water reducing agent, realizes especially by following steps:
1) raw material b, c and g mixing and stirring that adds water is made dropping material a, the concentration of dropping material a is 15-30%；
2) raw material d is added water and make dropping material b, the concentration of dropping material b is 20-30wt%；
3) raw material e, f mixing and stirring that adds water is made dropping material c, the concentration of dropping material c is 20-30wt%；
4) raw material a is added equipped with, in the reactor of water, being uniformly mixed and make concentration for 15- to dissolving completely
The solution of 40wt%；
5) reactor is warming up to 55-65 DEG C, start uniform Deca prepares in reactor simultaneously dropping material a, b with
And c, control a speed to make dropping material a complete Deca in 2-3h, control a speed to make dropping material b complete Deca in 0.5-1h, control
System drips speed makes dropping material c complete Deca in 2-3h, and after all dripping, insulation 1-2h terminates to reaction.
Beneficial effects of the present invention:
1) cement water reducing agent that the present invention provides makes concrete have high slump-retaining energy, collapses in 2h inner concrete
The no obvious rheological parameters' change with time of degree of falling；
2) cement water reducing agent that the present invention provides can greatly improve the mobility of concrete, so that the concrete long period is protected
Hold workability；
3) water reducer volume is low, and water-reducing rate is high, is reduced；
4) technological process of the present invention is simple, easy to operate.
Specific embodiment
Embodiment 1
The raw material g of raw material c and 1.07kg of raw material b, 200mol of 100mol and water mixing and stirring are made dense
Spend dropping material a for 15%；The d of 1.78kg is mixed and made into, with water, dropping material b that concentration is 20wt%；By the e of 0.0089kg,
The f of 2.21kg and water mixing and stirring make dropping material c that concentration is 20wt%；The raw material a100mol that molecular weight is 2000
Dissolve completely with being evenly stirred until in water addition reactor, concentration is 15wt%；
Reactor is warming up to 55 DEG C, then dropping material a, b and c is uniformly instilled in reactor, wherein a exists simultaneously
Complete Deca, b in 2h and complete Deca, c in 0.5h to complete Deca in 2h, after all adding, be incubated 1h, question response terminates
The water reducer being 35 % to solid content.
Embodiment 2
The raw material g of raw material c and 2.83kg of raw material b, 400mol of 200mol and water mixing and stirring are made dense
Spend dropping material a for 30%；The d of 1.2kg is mixed and made into, with water, dropping material b that concentration is 30wt%；By the e of 0.0072kg,
The f of 1.48kg and water mixing and stirring make dropping material c that concentration is 30wt%；The raw material a100mol that molecular weight is 2400
Dissolve completely with being evenly stirred until in water addition reactor, concentration is 25wt%；
Reactor is warming up to 55 DEG C, then dropping material a, b and c is uniformly instilled in reactor, wherein a exists simultaneously
Complete Deca, b in 3h and complete Deca, c in 1h to complete Deca in 3h, after all adding, be incubated 1.5h, question response terminates
The water reducer being 40% to solid content.
Embodiment 3
The raw material g of raw material c and 6kg of raw material b, 300mol of 150mol and water mixing and stirring are made concentration is
20% dropping material a；The d of 1.3kg is mixed and made into, with water, dropping material b that concentration is 25wt%；E, 2.08kg by 0.0065kg
F and water mixing and stirring make dropping material c that concentration is 25wt%；The a100mol of the raw material that molecular weight is 2200 and water
It is evenly stirred until in addition reactor and dissolves completely, concentration is 40wt%；
Reactor is warming up to 55 DEG C, then dropping material a, b and c is uniformly instilled in reactor, wherein a exists simultaneously
Complete Deca, b in 2.5h and complete Deca, c in 0.8h to complete Deca in 2.5h, after all adding, be incubated 2h, question response is tied
Bundle obtains the water reducer that solid content is 45%.
Sinteticses of the present invention are as follows with concrete mix testing result:
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, technology according to the present invention scheme and its
Inventive concept equivalent or change in addition, all should be included within the scope of the present invention.
Claims (5)
1. controllable sustained-release cement water reducing agent is it is characterised in that described water reducer is made up of the raw material of following mol ratio: a methyl
Acrylic Polyethylene Glycol: b acrylic acid: c ethyl acrylate=1:1 ~ 2: 2 ~ 4；Described raw material also include weight account for a, b, c weight and
0.4 ~ 0.8% d hydrogen peroxide, weight be 0.4 ~ 0.6% e l- ascorbic acid of d weight, weight account for a, b, c weight sum
0.5 ~ 1.0% f TGA and weight are the g of the 5 ~ 15% of b, c weight sum, and described g is the ratio that 1:1 pressed by op10 and stearic acid
The mixture of example composition；
The preparation method of described controllable sustained-release cement water reducing agent, specifically includes following steps:
1) raw material b, c and g mixing and stirring that adds water is made dropping material a, the concentration of dropping material a is 15-30%；
2) raw material d is added water and make dropping material b, the concentration of dropping material b is 20-30wt%；
3) raw material e, f mixing and stirring that adds water is made dropping material c, the concentration of dropping material c is 20-30 wt %；
4) raw material a is added equipped with, in the reactor of water, being uniformly mixed and make concentration for 15-40 wt to dissolving completely
The solution of %；
5) reactor is warming up to 55-65 DEG C, starts uniform Deca prepares in reactor dropping material a, b and c simultaneously,
Control a speed to make dropping material a complete Deca in 2-3h, control a speed to make dropping material b complete Deca in 0.5-1h, control and drip
Speed makes dropping material c complete Deca in 2-3h, and after all dripping, insulation 1-2h terminates to reaction.
2. controllable sustained-release cement water reducing agent according to claim 1 is it is characterised in that described raw material methylpropenyl gathers
The molecular weight of ethylene glycol is 2000-2400.
3. controllable sustained-release cement water reducing agent according to claim 1 is it is characterised in that described raw material b acrylic acid first
Base acrylic acid substitutes, and mol ratio used is as acrylic acid.
4. controllable sustained-release cement water reducing agent according to claim 1 is it is characterised in that described raw material c ethyl acrylate
Substituted with propyl acrylate, mol ratio used is as ethyl acrylate.
5. controllable sustained-release cement water reducing agent according to claim 1 is it is characterised in that described raw material f TGA is used
Mercapto ethyl ester substitutes, and weight proportion used is as TGA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310740766.9A CN103819627B (en) | 2013-12-30 | 2013-12-30 | Controllable slow release concrete water reducer and preparation method thereof |
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| CN201310740766.9A CN103819627B (en) | 2013-12-30 | 2013-12-30 | Controllable slow release concrete water reducer and preparation method thereof |
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| CN103819627A CN103819627A (en) | 2014-05-28 |
| CN103819627B true CN103819627B (en) | 2017-01-18 |
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| CN104371073A (en) * | 2014-10-30 | 2015-02-25 | 中铁四局集团有限公司 | Normal-temperature preparation method of slow-release polycarboxylic acid water reducing agent |
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| TWI268914B (en) * | 2003-05-09 | 2006-12-21 | Nippon Catalytic Chem Ind | Polycarboxylic acid concrete admixture |
| CN102351999A (en) * | 2011-07-15 | 2012-02-15 | 清华大学 | Method for preparing nanoparticle water reducing agent |
| CN102515618B (en) * | 2011-11-30 | 2013-11-20 | 上海大学 | Slow release slump retaining polycarboxylate water reducer and preparation thereof |
| CN102923989B (en) * | 2012-11-16 | 2014-10-01 | 北京建筑大学 | Clay-resistant polycarboxylate water reducer and preparation method thereof |
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