CN106746878A - A kind of viscosity modifier and preparation method thereof - Google Patents
A kind of viscosity modifier and preparation method thereof Download PDFInfo
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- CN106746878A CN106746878A CN201611073711.7A CN201611073711A CN106746878A CN 106746878 A CN106746878 A CN 106746878A CN 201611073711 A CN201611073711 A CN 201611073711A CN 106746878 A CN106746878 A CN 106746878A
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- viscosity modifier
- sodium
- concrete
- modifier according
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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
-
- 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
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides viscosity modifier, it is made up of by weight following components：15 parts of high polymer monomer, 0.1~0.5 part of chain initiator, 0.1~0.5 part of chain terminating agent, 0.1~1 part of catalyst, 0.1~0.8 part of preservative, 0.005~0.02 part of defoamer, 0.01~0.05 part of colouring agent, 80~120 parts of water, the molecular weight of the high polymer monomer is less than 2000.The viscosity modifier is very good with the compatibility of polycarboxylic acids mother liquor, it is easy to use, can realize with polycarboxylic acids mother liquor rapid dispersion, and ensure that long-term stability.Meanwhile, do not influence the performances such as water-reducing rate, slump holding and the setting time of additive while the cohesiveness of concrete is improved, and the later strength of concrete can be effectively improved.
Description
Technical field
The present invention relates to building material technical field, especially, it is viscosity modifier and preparation method thereof to be related to.
Background technology
In recent years, with the development of the large-scale national construction project such as state-owned railroads, harbour, nuclear power and these key projects
Requirement of the mesh to concrete high-performance so that carboxylic acid series high-performance dehydragent is commercially available to be developed rapidly.Polycarboxylic acids diminishing
Agent has high water reducing rate and function of slump protection is good, the low advantage of shrinkage, market utility ratio more and more higher.But it is mixed in high flowability
Coagulate in the work progress of soil, water-reducing rate poly carboxylic acid series water reducer very high can reduce the cohesiveness of concrete, it is easy to occur secreting
Water, segregation phenomenon, so as to have a strong impact on intensity, the durability etc. of concrete.The isolation of concrete is concrete mix composition
Cohesive strength between material is insufficiently resistant to coarse aggregate sinking, and concrete mix composition is separated from each other, cause internal composition and
The uneven phenomenon of structure.It is usually expressed as coarse aggregate to be separated from each other with mortar, the big particle of such as density deposits to mixture
Bottom, or coarse aggregate overall separation is out from mixture.Concrete water bleeding refers to concrete transporting, vibrates, pumps
During occur coarse aggregate sinking, moisture float phenomenon.Workability refers to that concrete is easy to each operation constructing operation and can obtain
Uniform quality is obtained, the performance of closely knit concrete is molded.
It is general by adding viscosity modifier (VMA) in work progress to improve bleeding, segregation phenomenon that concrete occurs
To increase the inside cohesive strength and water-retaining property of concrete, so as to reduce the separation rate of cement components, improve inside slurry
Homogeneity, improve working performance of concrete.The self-compacting concrete of only addition high-performance polycarboxylic acids water reducing agent has low
Yield stress, and add the concrete after VMA, wherein water reducer control yield stress and visco-plasticity, VMA control its layering,
The segregation phenomenon of bleeding.
The cohesive strength and water-retaining property of the general inside for increasing concrete by adding viscosity modifier of construction at present, but
There is consistency problem between polycarboxylate water-reducer and viscosity modifier.Cellulose ethers viscosity modifier is most commonly used that at present
The viscosity of concrete is adjusted with polyacrylamide tackifier, it is impossible to tackifier are dissolved into polycarboxylate water-reducer solution in advance
In.Cellulose family or polyacrylamide tackifier be configured to solution be added in polycarboxylate water-reducer occur viscosity disappear and
Precipitation phenomenon.
The content of the invention
The invention aims to overcome the deficiencies in the prior art, there is provided a kind of viscosity modifier, the viscosity modifier
Compatibility with polycarboxylic acids mother liquor is very good, it is easy to use, can realize with polycarboxylic acids mother liquor rapid dispersion, and ensure that
Long-term stability.Meanwhile, do not influenceed while the cohesiveness of concrete is improved the water-reducing rate of additive, the slump keep and
The performances such as setting time, and the later strength of concrete can be effectively improved, to solve above-mentioned technical problem.
The present invention can be achieved through the following technical solutions：
A kind of viscosity modifier, is made up of by weight following components：1~5 part of high polymer monomer, chain initiator 0.1~
0.5 part, 0.1~0.5 part of chain terminating agent, 0.1~1 part of catalyst, 0.1~0.8 part of preservative, 0.005~0.02 part of defoamer,
0.01~0.05 part of colouring agent, 80~120 parts of water；The molecular weight of the high polymer monomer is less than 2000；The viscosity modifier leads to
Bridging and the recombination function of polymer molecule are crossed, is uniformly isolated in the way of similar spaces matrix, form space three-dimensional netted
Structure, is distributed cement slurry, so that the anti-isolation of concrete is improved, anti-bleeding performance；The molecular weight of the molecule monomer is less than
When 2000, gained final viscosity conditioning agent performance is best, most stable.Meanwhile, the polymer substance less than 2000 is easily degraded,
Environment will not be polluted.
Further, the high polymer monomer is xanthans, warm human relations glue, Sodium Polyacrylate, polyacrylamide, polyoxyethylene
In one or more mixing；To combine realized function and choose monomer, acrylamide tends to salt-resistance；
Further, the chain initiator be hydrogen peroxide, cerous nitrate, potassium sulfate, sodium peroxydisulfate, one kind of ammonium persulfate or
Several mixing；Initiator amount is excessive, and the free radical of decomposition is excessive, causes velocity of initiation too fast, the relative molecular weight of polymer
Reduce, conversion ratio reduction, reaction is incomplete, the Efficient Adhesive Promotion reduction to net slurry, Binder Properties will be deteriorated, therefore, trigger
The consumption of agent and very crucial with the mol ratio of monomer, convenient mol ratio is initiator：Monomer is 0.05~0.08；
Further, the chain terminating agent is sodium hydrogensulfite, SDD, sodium polysulfide and Asia
One kind in sodium nitrate；If preparing the viscosity modifier of larger molecular weight, the mol ratio of chain terminating agent and monomer is controlled,
Convenient chain terminating agent：Monomer is 0.04~0.06；
Further, iron/aluminium in the catalyst, bimetallic cyaniding complex, it is Ni-based in catalyst one kind；
Further, the preservative is borax, Sodium Benzoate, formaldehyde, phenol, potassium sorbate, dehydroactic acid sodium, propionic acid
Calcium, sodium Diacetate, sodium lactate, propylparaben, in one or more combination；
Further, the preparation method of described viscosity modifier comprises the following steps：
(1) first added water to by formula ratio in reactor, be warming up to 45~55 DEG C, then monomer is even under stirring
Speed is dropped in reactor, is stirred；
(2) under stirring, it is added dropwise to step (1) using constant-current device, is reacted 3~4 hours；
(3) it was added dropwise to complete in 0.5 hour to chain terminating agent is added dropwise in step (3) under stirring, continues to react 1
~2 hours；
(4) colouring agent, preservative, defoamer are sequentially added under stirring to step (3), every kind of composition is added dropwise equal
Within 0.5 hour, after being sufficiently stirred for, product is stood to obtain.
The invention has the advantages that：
(1) viscosity modifier that the present invention is provided is very good with the compatibility of polycarboxylic acids mother liquor, it is easy to uses, can realize
With polycarboxylic acids mother liquor rapid dispersion, and long-term stability is ensure that.
(2) high molecular molecular weight is limited and is less than 2000, gained final viscosity conditioning agent performance is best, most stable.Together
When, polymer substance of the molecular weight less than 2000 is easily degraded, and environment will not be polluted.
(3) while concrete cohesiveness is improved, the water-reducing rate of additive, the slump is not influenceed to keep and setting time
Etc. performance, and the later strength of concrete can be effectively improved.
(4) space three-dimensional network structure is formed by macromolecular structure, is fixed tiny bubble by bubble partition, then wrapped
The moisture of the bubble is wrapped up in also while being fixed, and adsorbs excessive moisture, and bubble can block bleeding passage, so as to effectively improve
The workability of concrete, controls concrete water bleeding, isolation.Other the application is suitably introduced into chain initiator reduction molecular weight, and excellent
Change each molecular level to match somebody with somebody, control chain length, reduce bleeding.
(5) sensitiveness of the polycarboxylate water-reducer to concrete raw material, water consumption and volume can be reduced, therefore, use it
The concrete admixture of preparation is obtained in that wider range of operation window, reduces Concrete Enterprises production and quality control officer's
Work difficulty.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
The present invention is further detailed explanation below.
Specific embodiment
Embodiments of the invention are described in detail below, but the present invention can be limited and covered according to claim
Multitude of different ways implement.
Embodiment
Formula：A kind of viscosity modifier, is made up of by weight following components：High polymer monomer 1-5 parts, chain initiator
0.1~0.5 part, 0.1~0.5 part of chain terminating agent, 0.1~1 part of catalyst, 0.1~0.8 part of preservative, defoamer 0.005~
0.02 part, 0.01~0.05 part of colouring agent, 80~120 parts of water, the molecular weight of the high polymer monomer is respectively less than 2000.
The design parameter of the viscosity modifier formula of embodiment 1~6 is listed in table form, is specifically shown in Table 1.
The design parameter of the viscosity modifier formula of the embodiment 1~6 of table 1
The preparation method of described viscosity modifier comprises the following steps：
(1) first added water to by formula ratio in reactor, be warming up to 45~55 DEG C, then monomer is even under stirring
Speed is dropped in reactor, is stirred；
(2) under stirring, it is added dropwise to step (1) using constant-current device, is reacted 3~4 hours；
(3) it was added dropwise to complete in 0.5 hour to chain terminating agent is added dropwise in step (3) under stirring, continues to react 1
~2 hours；
(4) colouring agent is sequentially added under stirring to step (3), preservative, defoamer, every kind of composition is added dropwise
It is static to obtain product after being sufficiently stirred within 0.5 hour.Gained viscosity modifier product parameters are shown in Table 2.
The technical indicator of the technological parameter of 2 embodiment of table 1~6 and gained viscosity modifier
| Form | Liquid |
| Color | Yellowish-brown |
| Density (g/ml, 20 DEG C) | 0.95~1.05 |
| PH value | 6.5~8.5 |
| Toxicity | Nothing |
| Penetrating odor | Nothing |
Contrast experiment 1：
Machine-made Sand has been realized in 100% covering utilization rate in the somewhere of certain Shang Hun group.Because Machine-made Sand is present
Two characteristics.One is that most of Machine-made Sand content of stone powder are high；Two is its level with being mostly " two is more, centre is few ", therefore easily go out
Generally existing material glues in present high grade or low grade, loses big problem.In order to the viscosity modifier for proving this experiment exists
Influence under concrete Qinshui, isolation situation to its combination property, the proportioning for choosing concrete C50 is shown in Table 3, and performance parameter is shown in Table
4。
The proportioning of the concrete C50 of table 3
The performance parameter of the concrete C50 of table 4
The gained viscosity modifier of embodiment 2, the additive of redistribution, volume is added to be reduced to 1.6%, go out machine workability
Can preferably, 10% or so, design parameter is shown in Table 5 for loss in 1 hour.
Table 5 adds the performance parameter after concrete C50
As can be seen from Table 5, initial slump and divergence increase, falling after the initial time of falling bucket and 1 hour
The bucket time significantly shortens, and illustrates that the viscosity modifier of the application improves the cohesiveness of concrete.Meanwhile, with preparation
Additive long-term storage, is not in the situation of viscosity modifier layering precipitation, while mixed with what is configured mixed with viscosity modifier
Will not be with there is situation about gradually reducing with the extension of concrete standing time in the cohesiveness for coagulating soil.
Contrast test 2：
The mixed station concrete C30 match ratio design parameters of certain business are shown in Table 6.
The concrete C30 match ratios of table 6
Generally, easily there is concrete loss greatly or bleeding when 1.9~2.1% fluctuate in admixture dosage
Phenomenon, this parameter before additive is added is shown in Table 7.
The performance parameter of the concrete C30 of table 7
After the application viscosity modifier and additive redistribution is added, admixture dosage is 0.1%~0.2%
When, state of the viscosity modifier on concrete initially and after two hours is without particularly apparent influence.Design parameter is shown in Table 8.
Table 8 adds the performance parameter variations of C30 after additive
As can be seen from Table 8, add the application viscosity modifier allotment after additive gained concrete, gained 3d, 7d,
28d intensity contrasts, 3d intensity is more or less the same, and some change 7d, 28d intensity, and experimental data display adds the 28d intensity of additive
More than the intensity for not adding additive, therefore, the viscosity modifier of the application does not influence while the cohesiveness of concrete is improved
The water-reducing rate of additive, the slump keep and the performance such as setting time, and can effectively improve the later strength of concrete.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of viscosity modifier, it is characterised in that：It is made up of by weight following components：1~5 part of high polymer monomer, chain draw
0.1~0.5 part of agent of hair, 0.1~0.5 part of chain terminating agent, 0.1~1 part of catalyst, 0.1~0.8 part of preservative, defoamer 0.005
~0.02 part, 0.01~0.05 part of colouring agent, 80~120 parts of water；The molecular weight of the high polymer monomer is less than 2000.
2. viscosity modifier according to claim 1, it is characterised in that the high polymer monomer be xanthans, warm human relations glue,
One or more mixing in Sodium Polyacrylate, polyacrylamide, polyoxyethylene.
3. viscosity modifier according to claim 1, it is characterised in that the chain initiator is hydrogen peroxide, cerous nitrate, sulphur
One or more mixing of sour potassium, sodium peroxydisulfate, ammonium persulfate.
4. viscosity modifier according to claim 1, it is characterised in that the chain terminating agent is sodium hydrogensulfite, diformazan
One kind in base nabam, sodium polysulfide or natrium nitrosum.
5. viscosity modifier according to claim 1, it is characterised in that iron/aluminium, bimetallic cyaniding network in the catalyst
Compound, it is Ni-based in catalyst one kind.
6. viscosity modifier according to claim 1, it is characterised in that the preservative is borax, Sodium Benzoate, first
Aldehyde, phenol, potassium sorbate, dehydroactic acid sodium, calcium propionate, sodium Diacetate, sodium lactate, propylparaben, in one kind
Or several combinations.
7. the preparation method of the viscosity modifier according to claim 1~6 any one, methods described includes following step
Suddenly：
(1) first added water to by formula ratio in reactor, heated up, then monomer is at the uniform velocity dropped into reactor under stirring
In, stir；
(2) under stirring, to the company's of dropwise addition initiator in step (1), reacted；
(3) under stirring, to chain terminating agent is added dropwise in step (3), continue to react；
(4) colouring agent, preservative, defoamer are sequentially added under stirring to step (3), after being sufficiently stirred for, is stood
Product.
8. the preparation method of viscosity modifier according to claim 7, it is characterised in that step (1) temperature rises to 45~
55℃。
9. the preparation method of viscosity modifier according to claim 7, it is characterised in that step (2) uses constant-current device
Initiator is added dropwise, the completion of dropping in 1 hour is reacted 3~4 hours.
10. the preparation method of viscosity modifier according to claim 7, it is characterised in that step (3) described chain terminating agent
It was added dropwise to complete in 0.5 hour, continues to react 1~2 hour.
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