CN108751774A - A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer - Google Patents
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer Download PDFInfo
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- CN108751774A CN108751774A CN201810374785.7A CN201810374785A CN108751774A CN 108751774 A CN108751774 A CN 108751774A CN 201810374785 A CN201810374785 A CN 201810374785A CN 108751774 A CN108751774 A CN 108751774A
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- water
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- reducer
- polycarboxylate
- reducing agent
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of preparation methods of concrete prefabricated element polycarboxylate water-reducer, include the following steps：Unsaturated polyethenoxy ether class polymeric monomer and deionized water are mixed, stirs evenly, initiator is then added, continue to stir；Unsaturated carboxylic acid, chain-transferring agent, fumaric acid monoethanolamine ester, reducing agent and deionized water are mixed, and it stirs evenly, it is configured to mixed solution, mixed solution is gradually added dropwise in above-mentioned steps, after being added dropwise, then reaction 2~4 hours is added water regulation system solid content, obtains polycarboxylate superplasticizer mother liquor；Polycarboxylate superplasticizer mother liquor is diluted to mass concentration as 20% with water, is then compounded with melamine water-reducing agent, antifoaming agent and obtains a kind of concrete prefabricated element polycarboxylate water-reducer.Water-reducing agent preparation process is simple, and water-reducing rate is high, and function of slump protection is excellent, can increase considerably early strength of concrete and later strength, and can improve the surface smoothness of concrete product.
Description
Technical field
The invention belongs to technical field of concrete additives, and in particular to a kind of concrete prefabricated element polycarboxylate water-reducer
Preparation method.
Background technology
Polycarboxylate water-reducer as a new generation green, environment-friendly type high performance water-reducing agent, it is excellent with cement compatibility, and have
Have the advantages that volume is low, water-reducing rate is high, slump retaining is good, is widely used in engineering field at present.
With the increase of the infrastructure development projects such as railway, highway, airport, and the national assembly widelyd popularize at present
Formula builds policy, is on the increase to the demand of prefabricated components in engineering, and research is suitable for precast concrete, can significantly carry
High concrete early strength accelerates template turnover, and can improve the prefabricated components polycarboxylate water-reducer of concrete product appearance
Have a vast market foreground.
Currently, prefabricated components are mainly early-strength with polycarboxylate water-reducer, early strength of concrete can be quickly improved,
The preparation of Early-strength polycarboxylate superplasticizer is mainly carried out by synthesizing and compounding two methods.Synthetic method is mainly to polycarboxylic acids
Water-reducing agent molecular structure is designed, and being introduced on its strand has early powerful functional group, and the method compounded is main
It is to compound common model polycarboxylate water-reducer and organic or inorganic early strength agent component.
Although the method by compounding can improve early strength of concrete, problems can be also brought, such as compound sulphur
Sour sodium can cause concrete product surface analysis alkali anti-white；Sodium nitrite is compounded, the compatibility with polycarboxylate water-reducer can be influenced,
And compounding early strength agent can reduce the later strength of concrete, influence the endurance quality of concrete.
Further, since the bleed performance that polycarboxylate water-reducer itself has, the early-strength polycarboxylic acids of prefabricated components at present
Concrete product blibbing prepared by water-reducing agent is more, influences its appearance.
Invention content
In order to solve the above technical problems, the present invention provides a kind of preparations of concrete prefabricated element polycarboxylate water-reducer
The water-reducing rate of method, the concrete prefabricated element polycarboxylate water-reducer that the preparation method obtains is high, and function of slump protection is excellent, energy
Early strength of concrete is increased considerably, late strength of concrete can be also increased, improves the surface smoothness of concrete product, it is raw
Production. art is simple, environmentally friendly.
The technical solution that the present invention takes is：
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, includes the following steps：
(1) unsaturated polyethenoxy ether class polymeric monomer and deionized water are mixed, stir evenly, initiator is then added,
Continue to stir；
(2) unsaturated carboxylic acid, chain-transferring agent, fumaric acid monoethanolamine ester, reducing agent and deionized water are mixed, and stirred
Uniformly, it is configured to mixed solution, mixed solution is gradually added dropwise in step (1), after being added dropwise, it is small to be stirred to react 2~4
When, water regulation system solid content is then added, obtains polycarboxylate superplasticizer mother liquor；
(3) by polycarboxylate superplasticizer mother liquor with water be diluted to mass concentration be 20%, then with melamine water-reducing agent, antifoaming agent
It is compounded and obtains a kind of concrete prefabricated element polycarboxylate water-reducer.
Process made above carries out at normal temperatures.
Further, unsaturated polyethenoxy ether class polymeric monomer, unsaturated carboxylic acid, fumaric acid monoethanolamine ester, initiator,
Mass ratio between reducing agent, chain-transferring agent is 100:5.0~13.5:4.0~12.5:0.4~1.2:0.1~0.30:0.25
~0.8.
The melamine water-reducing agent is the 5%~30% of 20% polycarboxylate superplasticizer mother liquor quality.
The antifoaming agent is the 0.01%~0.1% of 20% polycarboxylate superplasticizer mother liquor quality.
In the step (1), the mass ratio of polyethenoxy ether class polymeric monomer and deionized water is 1.5~2.0:1.
In the step (2), the quality of deionized water is unsaturated carboxylic acid, chain-transferring agent, fumaric acid monoethanolamine ester, goes back
3~4.5 times of former agent quality sum.
In the step (2), rate of addition is controlled, is dripped off mixed solution in 3h, so that polymerisation is more uniform
It carries out；The solid content of the Early-strength polycarboxylate superplasticizer is 40%.
The unsaturation polyethenoxy ether class polymeric monomer is isobutene alcohol polyoxyethylene ether (HPEG), prenol polyoxy second
One kind in alkene ether (TPEG).
The unsaturation polyethenoxy ether class polymeric monomer average molecular weight is 2400~6000.
The unsaturated carboxylic acid is one or more of methacrylic acid, acrylic acid, maleic anhydride, fumaric acid.
The initiator is one kind in hydrogen peroxide, ammonium persulfate, potassium peroxydisulfate, azo diisopropylamidinateand oxazoline hydrochloride
Or it is several.
The chain-transferring agent is one in thioacetic acid, mercaptopropionic acid, isopropanol, methylpropene sodium sulfonate, mercaptoethanol
Kind is several.
The reducing agent be tartaric acid, sodium thiosulfate, L-AA, sodium hypophosphite, one kind in sodium formaldehyde sulfoxylate or
It is several.
In preparation method provided by the invention, each raw material effect is as follows：
Unsaturated polyethenoxy ether class polymeric monomer：It is free-radical polymerized with unsaturated carboxylic acid, the progress of fumaric acid monoethanolamine ester,
It is used as branch in polycarboxylate water-reducer, generates steric hindrance effect, makes water-reducing agent that there is good water-reducing effect.
Fumaric acid monoethanolamine ester：It is free-radical polymerized with unsaturated polyethenoxy ether class polymeric monomer, unsaturated carboxylic acid progress,
Main chain is used as in water-reducing agent.
Unsaturated carboxylic acid：It is free-radical polymerized with unsaturated polyethenoxy ether class polymeric monomer, the progress of fumaric acid monoethanolamine ester,
It is used as main chain in water-reducing agent, makes to carry a large amount of carboxyl functional group on polycarboxylate water-reducer molecule main chain, generates electrostatic repulsion
Effect makes water-reducing agent have good water-reducing effect.
Initiator and reducing agent：Initiator and reducing agent can be generated free radicals as redox initiation system, be caused
The activation energy of monomer polymerization, the system is low, can also obtain faster reaction rate at a lower temperature.
Chain-transferring agent：It can make propagating radical that the substance of radical transfer occur, can control polymer chain length, to adjust
Save the relative molecular mass of polymer.
Melamine water-reducing agent：Melamine water-reducing agent is non-air-entraining water-reducing agent, can increase the finish of product surface, while close
Amine water-reducing agent can promote the early hydration of cement, improve early strength of concrete.
Antifoaming agent：Deleterious bubbles in concrete are eliminated, concrete density is on the one hand improved, increase concrete strength, separately
On the one hand concrete product surface pores can be reduced.
The concrete prefabricated element polycarboxylate water-reducer that preparation method provided by the invention is prepared, in hydrated cementitious
In environment, fumaric acid monoethanolamine ester slowly hydrolyzes, and releases monoethanolamine, can rapidly promote hydrated cementitious, early strong effect
It is good, in addition, melamine water-reducing agent can also promote hydrated cementitious, improve early strength of concrete.Melamine water-reducing agent is that non-research work of air entrained type subtracts
Aqua, antifoaming agent can eliminate the deleterious bubbles in concrete, and by the compounding with polycarboxylate water-reducer, coagulation can be greatly lowered
Air content in soil, prepared concrete product have higher finish.
Compared with prior art, the present invention having following major advantage：
1. concrete prefabricated element prepared by the present invention is high with polycarboxylate water-reducer water-reducing rate, Slump Time losing of Large is small,
It is good with the adaptability of cement.
2. it is strong quickly to improve concrete early stage to concrete prefabricated element polycarboxylate water-reducer prepared by the present invention
Degree, can also increase late strength of concrete, not influence endurance performance of concrete.
3. concrete prefabricated element polycarboxylate water-reducer prepared by the present invention, prepared concrete product surface light
Clean, pore-free.
4. preparation process of the present invention is simple, reaction time is short, environmentally friendly.
Specific implementation mode
The following describes the present invention in detail with reference to examples.
Embodiment 1
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, includes the following steps：
(1) it by 360gHPEG-2400 and 200g deionized waters, is put into four-hole boiling flask, stirs evenly, 1g persulfuric acid is added
Ammonium；
(2) by 0.55gL- ascorbic acid, 2.0g thioacetic acid, 40g methacrylic acids, 18g fumaric acid monoethanolamine esters and
250g deionized waters mix, and stir evenly, and form mixed solution；Mixed solution is controlled into rate of addition, is dripped off in 3h, is continued
After being stirred to react 2h, 182g water is added, 40% polycarboxylate superplasticizer mother liquor contained admittedly is made；
(3) 50g water, 10g melamines water-reducing agent, 0.03g is added in 50g polycarboxylate superplasticizer mother liquors obtained above to defoam
Agent stirs evenly to get concrete prefabricated element polycarboxylate water-reducer.
Embodiment 2
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, includes the following steps：
(1) it by 360gHPEG-3000 and 200g deionized waters, is put into four-hole boiling flask, stirs evenly, 1.5g azos are added
Diisopropylamidinateand oxazoline hydrochloride；
(2) by 0.8 tartaric acid, 1.0g mercaptoethanols, 34g acrylic acid, 25g fumaric acid monoethanolamine esters and 250g deionizations
Water mixes, and stirs evenly, and forms mixed solution；Mixed solution is controlled into rate of addition, is dripped off in 3h, continues to be stirred to react 2h
Afterwards, 183.5g water is added and 40% polycarboxylate superplasticizer mother liquor contained admittedly is made；
(3) 50g water, 15g melamines water-reducing agent, 0.05g is added in 50g polycarboxylate superplasticizer mother liquors obtained above to defoam
Agent stirs evenly to get concrete prefabricated element polycarboxylate water-reducer.
Embodiment 3
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, includes the following steps：
(1) it by 360gHPEG-3000 and 200g deionized waters, is put into four-hole boiling flask, stirs evenly, 2.8g dioxygens are added
Water；
(2) by 0.9g sodium formaldehyde sulfoxylates, 1.0g thioacetic acid, 0.9g mercaptoethanols, 5g fumaric acid, 30g acrylic acid, 35g richness horses
Sour monoethanolamine ester and the mixing of 250g deionized waters, stir evenly, form mixed solution；Mixed solution is controlled into rate of addition,
It drips off, continues after being stirred to react 2h in 3h, 196.5g water is added, 40% polycarboxylate superplasticizer mother liquor contained admittedly is made；
(3) 50g water, 18g melamines water-reducing agent, 0.06g is added in 50g polycarboxylate superplasticizer mother liquors obtained above to defoam
Agent stirs evenly to get concrete prefabricated element polycarboxylate water-reducer.
Embodiment 4
A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, includes the following steps：
(1) it by 360gTPEG-2400 and 200g deionized waters, is put into four-hole boiling flask, stirs evenly, 0.75g mistakes are added
Potassium sulfate；
(2) by 0.75g sodium hypophosphites, 0.9g mercaptopropionic acids, 20g acrylic acid, 40g fumaric acid alkanolamine ester and 250g go from
Sub- water mixing, stirs evenly, forms mixed solution；Mixed solution is controlled into rate of addition, is dripped off in 3h, continues to be stirred to react
After 2h, 183.5g water is added, 40% polycarboxylate superplasticizer mother liquor contained admittedly is made；
(3) 50g water, 21g melamines water-reducing agent, 0.04g is added in 50g polycarboxylate superplasticizer mother liquors obtained above to defoam
Agent stirs evenly to get concrete prefabricated element polycarboxylate water-reducer.
Implementation result compares：
In order to evaluate the performance of concrete prefabricated element polycarboxylate water-reducer of the invention, with reference to GB8076-2008《It is mixed
Solidifying soil additive》And GB/T50081-2002《Standard for test methods of mechanical properties of ordinary concrete》Relevant regulations, using mixed
The properties of solidifying soil testing inspection this product, including initial slump, the 30min slumps, air content and 1d, 3d, 28d resistance to compression
The performance parameters such as intensity.
1 concrete mix (kg/m of table3)
Note：Cement is conch cement P.O42.5.
Test result see the table below shown in 2.
The test data of 2 prefabricated components polycarboxylate water-reducer of table
Note：Comparative example 1, comparative example 2 are commercially available prefabricated components Early-strength polycarboxylate superplasticizer.
As can be seen from Table 2, compared with common polycarboxylate water-reducer, prefabricated components produced by the present invention are subtracted with polycarboxylate water-reducer
Water rate and function of slump protection are almost the same, and air content is relatively low.Early strength of concrete can be not only greatly improved, also can preferably be improved
Late strength of concrete.Prepared concrete surface stomata is less, and appearance is bright and clean, and simple production process, to environment friend
It is good.
Above-mentioned reference embodiment carries out a kind of preparation method of concrete prefabricated element polycarboxylate water-reducer detailed
Description is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from
Change and modification under present general inventive concept should belong within protection scope of the present invention.
Claims (10)
1. a kind of preparation method of concrete prefabricated element polycarboxylate water-reducer, which is characterized in that include the following steps：
(1) unsaturated polyethenoxy ether class polymeric monomer and deionized water are mixed, stirs evenly, initiator is then added, continued
Stirring；
(2) unsaturated carboxylic acid, chain-transferring agent, fumaric acid monoethanolamine ester, reducing agent and deionized water are mixed, and stirred equal
It is even, it is configured to mixed solution, mixed solution is gradually added dropwise in step (1), after being added dropwise, is stirred to react 2~4 hours,
Then water regulation system solid content is added, obtains polycarboxylate superplasticizer mother liquor；
(3) polycarboxylate superplasticizer mother liquor is diluted to mass concentration as 20% with water, is then carried out with melamine water-reducing agent, antifoaming agent
Compounding obtains a kind of concrete prefabricated element polycarboxylate water-reducer.
2. preparation method according to claim 1, which is characterized in that unsaturated polyethenoxy ether class polymeric monomer, unsaturation
Mass ratio between carboxylic acid, fumaric acid monoethanolamine ester, initiator, reducing agent, chain-transferring agent is 100:5.0~13.5:4.0~
12.5:0.4~1.2:0.1~0.30:0.25~0.8.
3. preparation method according to claim 1 or 2, which is characterized in that the melamine water-reducing agent is that 20% polycarboxylic acids subtracts
The 5%~30% of aqua mother liquor quality.
4. preparation method according to claim 1 or 2, which is characterized in that the antifoaming agent is 20% polycarboxylate water-reducer
The 0.01%~0.1% of mother liquor quality.
5. preparation method according to claim 1 or 2, which is characterized in that the unsaturation polyethenoxy ether class polymeric monomer
For one kind in isobutene alcohol polyoxyethylene ether (HPEG), isoamyl alcohol polyoxyethylene ether (TPEG).
6. preparation method according to claim 1 or 2, which is characterized in that the unsaturation polyethenoxy ether class polymeric monomer
Average molecular weight is 2400~6000.
7. preparation method according to claim 1 or 2, which is characterized in that the unsaturated carboxylic acid is methacrylic acid, third
One or more of olefin(e) acid, maleic anhydride, fumaric acid.
8. preparation method according to claim 1 or 2, which is characterized in that the initiator be hydrogen peroxide, ammonium persulfate,
One or more of potassium peroxydisulfate, azo diisopropylamidinateand oxazoline hydrochloride.
9. preparation method according to claim 1 or 2, which is characterized in that the chain-transferring agent is thioacetic acid, sulfydryl third
One or more of acid, isopropanol, methylpropene sodium sulfonate, mercaptoethanol.
10. preparation method according to claim 1 or 2, which is characterized in that the reducing agent is tartaric acid, thiosulfuric acid
One or more of sodium, L-AA, sodium hypophosphite, sodium formaldehyde sulfoxylate.
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| CN110540620A (en) * | 2019-01-09 | 2019-12-06 | 咸阳鸿鑫建材有限公司 | polycarboxylate superplasticizer and preparation method thereof |
| CN110845672A (en) * | 2019-10-30 | 2020-02-28 | 云南森博混凝土外加剂有限公司 | Polycarboxylic acid series concrete gel reducing agent and preparation method thereof |
| CN111908852A (en) * | 2020-08-28 | 2020-11-10 | 江苏蓝圈新材料股份有限公司 | Concrete for prefabricated part and preparation method thereof |
| CN112300346A (en) * | 2019-07-30 | 2021-02-02 | 中国石油天然气集团有限公司 | Amphoteric ion grafted copolymer fluid loss agent and preparation method and application thereof |
| CN114516732A (en) * | 2022-03-15 | 2022-05-20 | 江苏国胶新材料有限公司 | Method for preparing early strength type water reducing agent based on waste water recycling |
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| CN111908852A (en) * | 2020-08-28 | 2020-11-10 | 江苏蓝圈新材料股份有限公司 | Concrete for prefabricated part and preparation method thereof |
| CN114516732A (en) * | 2022-03-15 | 2022-05-20 | 江苏国胶新材料有限公司 | Method for preparing early strength type water reducing agent based on waste water recycling |
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