CN109160766A - A kind of concrete nucleocapsid structure swelling agent and preparation method thereof - Google Patents
A kind of concrete nucleocapsid structure swelling agent and preparation method thereof Download PDFInfo
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- CN109160766A CN109160766A CN201811178726.9A CN201811178726A CN109160766A CN 109160766 A CN109160766 A CN 109160766A CN 201811178726 A CN201811178726 A CN 201811178726A CN 109160766 A CN109160766 A CN 109160766A
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- swelling 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of concrete nucleocapsid structure swelling agents, including calcium oxide 55~76%, high molecular polymer 7~12%, azodiisobutyronitrile 1~5%, 3- aminopropyltriethoxy diethoxy silane 3~6%, calgon 2~4%, sodium metasilicate 2~4%, iron chloride 9~14%.In the preparation method of above-mentioned swelling agent, it will successively increase the anhydrous methylene chloride solution of Molecularly Imprinted Polymer, the ethanol solution of 3- aminopropyltriethoxy diethoxy silane in calcium oxide；Again plus azodiisobutyronitrile completes surface graft modification；Finally plus sodium hexametaphosphate solution, sodium silicate solution and ferric chloride solution, nucleocapsid structure swelling agent finished product is made through muffle furnace roasting.The swelling agent grain diameter is uniform, and iron oxide shell is avoided that calcium oxide swelling agent early hydration is too fast, and the alkaline reaction in iron oxide and concrete generates iron hydroxide, provides reexpansion source, solves the problems, such as that effective compensation is shunk；The compactness for increasing concrete, improves the compression strength and anti-permeability performance of concrete.
Description
Technical field
The present invention relates to technical field of concrete additives, and in particular to a kind of concrete nucleocapsid structure swelling agent and
Preparation method.
Background technique
Calcium oxide (CaO) is a kind of important inorganic expansion agents raw material, mainly few in water requirement using it in concrete
Under conditions of, it can be reacted with water and generate the lower calcium hydroxide of dissolubility, while generate biggish expansion energy, compensate early stage coagulation
Soil is shunk, to reduce the probability of crack generation.Since calcium oxide and water reaction are very violent, can be released moment when being contacted with water
Very high reaction heat, thermal discharge makes greatly inside concrete temperature rise very fast, but internal heat dissipating is slow, surface cooling velocity again very
Fastly, there is thermal cracking in the generation for causing temperature stress, higher additionally, due to calcium oxide reactivity, in concrete structure shape
At the plastic stage before, the expansion energy of aquation can not play the role of compensation and shrink, and invalid expansion occurs, lead to coagulation
Soil easily cracks after pouring, to seriously affect the durability of concrete structure.
In order to solve the problems, such as that calcium oxide (CaO) and the water extent of reaction are quite violent, the generation of invalid expansion energy is reduced, now
There is technology calcium oxide surface multipair greatly to carry out cladding processing, avoids it from directly contacting with water and generate very exothermic phenomenon, same to time delay
The long and water reaction time.Such as a kind of invention " the modified oxidized calcium class of cement concrete of Patent No. 201510060677.9
Swelling agent " carries out long chain fatty acids cladding to swelling agent surface, but only simply solves the problems, such as that calcium oxide is swift in response, but
Lack reexpansion source in swelling agent, it is still not ideal enough for the anti-crack ability for sufficiently improving concrete.In another example Patent No.
201510061056.2 invention " a kind of modified oxidized calcium class cement concrete swelling agent and preparation method thereof ", what is provided is swollen
Swollen dose, it is wrapped in calcium oxide surface using degradable high polymers such as polyester, polycarbonate or polyestercarbonates, it is same to lack
Few reexpansion source.
Summary of the invention
In order to guarantee to provide reexpansion source, the present invention provides one kind after carrying out package processing to calcium oxide surface
Concrete nucleocapsid structure swelling agent is realized especially by following technology.
A kind of concrete nucleocapsid structure swelling agent, includes: calcium oxide 55~76%, polyphosphazene polymer by mass percentage
Conjunction object 7~12%, azodiisobutyronitrile 1~5%, 3- aminopropyltriethoxy diethoxy silane 3~6%, calgon 2~
4%, sodium metasilicate 2~4%, iron chloride 9~14%；Wherein, the high molecular polymer is biodegradable.
Above-mentioned concrete is in nucleocapsid structure swelling agent, and sodium hexametaphosphate solution and sodium silicate solution are as compounding
Dispersing agent can promote chlorination dissolved ferric iron and the iron hydroxide uniform adsorption of generation in the calcium oxide handled through surface grafting
Surface.By roasting in muffle furnace, the iron hydroxide reaction on surface generates iron oxide, keeps its attachment more stable.This core-shell structure copolymer
On the one hand the too fast problem of CaO swelling agent early hydration has been effectively relieved in the oxidation of the structure swelling agent, it is avoided to mould in concrete
Sexual stage, the expansion energy of aquation cannot play effective compensation contraction；On the other hand, when in use, in iron oxide and concrete
Akaline liquid reacts again generates iron hydroxide, causes volume expansion, provides reexpansion source for concrete, while can increase again
The compactness for adding concrete improves the compression strength and anti-permeability performance of concrete.
Preferably, the biodegradable high molecular polymer include polyorthoester, in polylactide-co-glycolide at least
It is a kind of.
It is highly preferred that above-mentioned concrete nucleocapsid structure swelling agent, includes: calcium oxide 66%, high by mass percentage
Molecularly Imprinted Polymer 8.5%, azodiisobutyronitrile 3%, 3- aminopropyltriethoxy diethoxy silane 4.5%, calgon
3.5%, sodium metasilicate 3.5%, iron chloride 11%.
The present invention also provides the above-mentioned concrete preparation methods of nucleocapsid structure swelling agent, comprising the following steps:
S1, it weighs calcium oxide drying, is finely ground, making 200~600m of its specific surface area2/ kg, i.e. sample A；Weigh macromolecule
Polymer, azodiisobutyronitrile, 3- aminopropyltriethoxy diethoxy silane, calgon, sodium metasilicate, iron chloride are made spare；
Whole high molecular polymers are taken to be configured to the anhydrous methylene chloride solution that concentration is 10g/L, ie in solution B；Take whole 3- aminopropyls
Methyldiethoxysilane is configured to the ethanol solution that concentration is 6g/L, ie in solution C；Take whole calgons, sodium metasilicate point
It is not configured to the aqueous solution that mass fraction is 5%, ie in solution D, E；Taking whole iron chloride to be configured to mass fraction is 12%
Aqueous solution, ie in solution F；
S2, all A sample equivalent is added in batch in the solution B, is stirred evenly, then be removed in vacuum at 60 DEG C
Dichloromethane solvent obtains wrapping up modified calcium oxide swelling agent, i.e. P-CaO through high molecular polymer surface；
S3, it takes whole P-CaO to add in the solution C, stirs 1~3h；Then azodiisobutyronitrile is added, is stirred again
2~4h is mixed, 3~6h is stood, taking precipitate is dry in 60 DEG C of baking oven, obtains the modified oxidized calcium expansion of surface grafting processing
Agent, i.e. ADMS-P-CaO；
S4, it takes whole ADMS-P-CaO to be configured to the slurry that concentration is 300g/L with dehydrated alcohol, adds the solution
D, E is stirred evenly；Then the solution F is added, is heated to boiling, reacts 2~3h；Last washed, neutralization, drying, are put into Ma Fu
Kiln roasting obtains to surface and is oxidized the ADMS-P-CaO swelling agent finished product of iron cladding.
In preparation method of the above-mentioned concrete with nucleocapsid structure swelling agent, principle is: first with biodegradable height
Molecularly Imprinted Polymer is wrapped in calcium oxide surface, keeps the agglomeration of calcium oxide minimum, partial size more evenly, in organic solvent more preferably
Then dispersion carries out surface graft modification with 3- aminopropyltriethoxy diethoxy silane again, improve the adhesion on calcium oxide surface
Can, it is finally reacted again with iron chloride, realizes that one layer of iron oxide is uniformly wrapped up on surface.
Preferably, in step S1, the specific surface area of sample is 450m2/kg。
It is highly preferred that in step S4, the heating mode of the muffle furnace are as follows: 560~700 DEG C are first warming up in 1~3h,
Keep the temperature 1~2.5h；Room temperature is finally gradually dropped in 2~4h under nitrogen protection.
It is further preferred that in step S4, the heating mode of the muffle furnace are as follows: 680 DEG C are first warming up in 2h, heat preservation
2h；Room temperature is finally gradually dropped in 3.5h under nitrogen protection.
The present invention also provides the above-mentioned concrete preparation method of nucleocapsid structure swelling agent,.
Compared with prior art, the invention has the beneficial effects that:
1, the effect of calcium oxide unity can be made to subtract in the processing of calcium oxide surface filming using degradable high molecular material
Small, partial size more evenly, can more preferably disperse in organic solvent；
2, shell cladding being done with iron oxide and ADMS-P-CaO being made, it is too fast on the one hand to alleviate calcium oxide swelling agent early hydration
Problem solves the problem of that it cannot play effective compensation in the expansion energy of concrete plastic stage aquation and shrink；
3, the alkaline reaction in iron oxide and concrete generates iron hydroxide, causes volume expansion, provides reexpansion source；
4, the alkaline reaction in iron oxide generates iron hydroxide, can increase the compactness of concrete, improves the anti-of concrete
Compressive Strength and anti-permeability performance.
Specific embodiment
Technical solution of the present invention will be clearly and completely described below, it is clear that described embodiment is only
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained, shall fall within the protection scope of the present invention under the conditions of not making creative work.
Concrete nucleocapsid structure swelling agent prepared by following example 1~9, comparative example 1~6, preparation method are as follows:
S1, it weighs calcium oxide drying, is finely ground, making its specific surface area α m2/ kg, i.e. sample A；Polylactide-second is weighed to hand over
Ester, azodiisobutyronitrile, 3- aminopropyltriethoxy diethoxy silane, calgon, sodium metasilicate, iron chloride are made spare；It takes complete
Portion's polylactide-co-glycolide is configured to the anhydrous methylene chloride solution that concentration is 10g/L, ie in solution B；Take whole 3- aminopropyl first
Base diethoxy silane is configured to the ethanol solution that concentration is 6g/L, ie in solution C；Take whole calgons, sodium metasilicate difference
It is configured to the aqueous solution that mass fraction is 5%, ie in solution D, E；Whole iron chloride are taken to be configured to the water that mass fraction is 12%
Solution, ie in solution F；
S2, all A sample equivalent is added in batch in the solution B, is stirred evenly, then be removed in vacuum at 60 DEG C
Dichloromethane solvent obtains wrapping up modified calcium oxide swelling agent, i.e. P-CaO through polylactide-co-glycolide surface；
S3, it takes whole P-CaO to add in the solution C, stirs 1~3h；Then azodiisobutyronitrile is added, is stirred again
2~4h is mixed, 3~6h is stood, taking precipitate is dry in 60 DEG C of baking oven, obtains the modified oxidized calcium expansion of surface grafting processing
Agent, i.e. ADMS-P-CaO；
S4, it takes whole ADMS-P-CaO to be configured to the slurry that concentration is 300g/L with dehydrated alcohol, adds the solution
D, E is stirred evenly；Then the solution F is added, is heated to boiling, reacts 2~3h；Last washed, neutralization, drying, are put into Ma Fu
In furnace, it is first warming up to T DEG C in 1~3h, keeps the temperature 2h；Room temperature is finally gradually dropped in 3.5h under nitrogen protection, obtains table
Face is oxidized the ADMS-P-CaO swelling agent finished product of iron cladding.
Examples 1 to 7, comparative example 1~6
In Examples 1 to 7, comparative example 1~6, by the mass percent of table 1 weigh calcium oxide, polylactide-co-glycolide,
Azodiisobutyronitrile, 3- aminopropyltriethoxy diethoxy silane, calgon, sodium metasilicate, iron chloride.Each embodiment and compare
Example nucleocapsid structure swelling agent in the preparation, the specific surface area α m of the sample A of step S12It see the table below 1 for T DEG C in/kg, step S4.
The nucleocapsid structure expansion agent prescription and preparation condition table of 1 Examples 1 to 7 of table, comparative example 1~6
Application examples
In embodiment, the ADMS-P-CaO of the ADMS-P-CaO for taking its step S3 to prepare, i.e. monosodium glutamate iron oxide cladding is swollen
Swollen dose as a control group.Examples 1 to 7, the performance of comparative example 1~6, control group are detected, and is prepared using these swelling agents
Concrete pressure-proof and snap-resistent and limited expansion rate, concrete outcome see the table below 2,3.
2 Examples 1 to 7 of table, comparative example 1~6 nucleocapsid structure swelling agent performance table
The pressure-proof and snap-resistent and limited expansion rate of concrete prepared by 3 Examples 1 to 7 of table, comparative example 1~6 detect table
By upper table 2,3 it is found that the nucleocapsid structure swelling agent of Examples 1 to 7 preparation, performance is best, meanwhile, using reality
The nucleocapsid structure swelling agent of the preparation of example 1~7 is applied, the mechanical property of the concrete of preparation is also more than control group, comparative example 1~6
It is excellent.Wherein, the nucleocapsid structure swelling agent performance that prepared by embodiment 1 is best, and the mechanical performance of concrete accordingly prepared is optimal.This
Illustrate first to wrap up calcium oxide particle surface using high molecular polymer, then carry out surface graft modification, outside last enwrapping ferric oxide
The swelling agent of nucleocapsid structure prepared by the mode of shell, compared to the oxidation only wrapped up on surface with degradable high polymer
Calcium swelling agent has better performance, and the concrete limited expansion rate of preparation, flexural strength, compression strength are more preferable.
Claims (7)
1. a kind of concrete nucleocapsid structure swelling agent, which is characterized in that include: by mass percentage calcium oxide 55~76%,
High molecular polymer 7~12%, azodiisobutyronitrile 1~5%, 3- aminopropyltriethoxy diethoxy silane 3~6%, six inclined phosphorus
Sour sodium 2~4%, sodium metasilicate 2~4%, iron chloride 9~14%；Wherein, the high molecular polymer is biodegradable.
2. a kind of concrete nucleocapsid structure swelling agent according to claim 1, which is characterized in that biodegradable
The high molecular polymer includes at least one of polyorthoester, polylactide-co-glycolide.
3. a kind of concrete nucleocapsid structure swelling agent according to claim 2, which is characterized in that by mass percentage
It include: calcium oxide 66%, high molecular polymer 8.5%, azodiisobutyronitrile 3%, 3- aminopropyltriethoxy diethoxy silane
4.5%, calgon 3.5%, sodium metasilicate 3.5%, iron chloride 11%.
4. the preparation method of claims 1 to 3 described in any item concrete nucleocapsid structure swelling agent, which is characterized in that packet
Include following steps:
S1, it weighs calcium oxide drying, is finely ground, making 200~600m of its specific surface area2/ kg, i.e. sample A；Weigh high molecular polymerization
Object, azodiisobutyronitrile, 3- aminopropyltriethoxy diethoxy silane, calgon, sodium metasilicate, iron chloride are made spare；It takes complete
Portion's high molecular polymer is configured to the anhydrous methylene chloride solution that concentration is 10g/L, ie in solution B；Take whole 3- aminopropyltriethoxies
Diethoxy silane is configured to the ethanol solution that concentration is 6g/L, ie in solution C；Whole calgons, sodium metasilicate are taken to match respectively
It is set to the aqueous solution that mass fraction is 5%, ie in solution D, E；Take whole iron chloride be configured to mass fraction be 12% it is water-soluble
Liquid, ie in solution F；
S2, all A sample equivalent is added in batch in the solution B, is stirred evenly, then dichloro is removed in vacuum at 60 DEG C
Methane solvent obtains wrapping up modified calcium oxide swelling agent, i.e. P-CaO through high molecular polymer surface；
S3, it takes whole P-CaO to add in the solution C, stirs 1~3h；Then azodiisobutyronitrile is added, is again stirring for 2
~4h stands 3~6h, and taking precipitate is dry in 60 DEG C of baking oven, obtains the modified oxidized calcium swelling agent of surface grafting processing,
That is ADMS-P-CaO；
S4, it takes whole ADMS-P-CaO to be configured to the slurry that concentration is 300g/L with dehydrated alcohol, adds the solution D, E is stirred
It is even；Then the solution F is added, is heated to boiling, reacts 2~3h；Last washed, neutralization, drying, are put into muffle furnace and roast
It burns, obtains to surface and be oxidized the ADMS-P-CaO swelling agent finished product of iron cladding.
5. the concrete according to claim 4 preparation method of nucleocapsid structure swelling agent, which is characterized in that step S1
In, the specific surface area of sample is 450m2/kg。
6. the concrete according to claim 4 or 5 preparation method of nucleocapsid structure swelling agent, which is characterized in that step
In S4, the heating mode of the muffle furnace are as follows: be first warming up to 560~700 DEG C in 1~3h, keep the temperature 1~2.5h；Finally in nitrogen
Room temperature is gradually dropped under gas shielded in 2~4h.
7. the concrete according to claim 6 preparation method of nucleocapsid structure swelling agent, which is characterized in that step S4
In, the heating mode of the muffle furnace are as follows: be first warming up to 680 DEG C in 2h, keep the temperature 2h；Finally under nitrogen protection in 3.5h
It is gradually dropped to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113121152A (en) * | 2021-05-13 | 2021-07-16 | 南京茂汇盈科技有限公司 | Concrete expanding agent and preparation and use methods thereof |
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| CN103964722A (en) * | 2014-05-04 | 2014-08-06 | 苏州市市政工程设计院有限责任公司 | Chemical admixture capable of improving effectiveness of concrete expanding agent under restrictive condition |
| CN106348643A (en) * | 2016-08-19 | 2017-01-25 | 桂林华越环保科技有限公司 | Modified concrete expansive agent |
| CN108249811A (en) * | 2018-02-02 | 2018-07-06 | 日照弗尔曼新材料科技有限公司 | A kind of concrete anticracking swelling agent and preparation method thereof |
-
2018
- 2018-10-10 CN CN201811178726.9A patent/CN109160766B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04285080A (en) * | 1991-03-14 | 1992-10-09 | Tsutsunaka Plast Ind Co Ltd | Composition for inorganic expanded body |
| CN103964722A (en) * | 2014-05-04 | 2014-08-06 | 苏州市市政工程设计院有限责任公司 | Chemical admixture capable of improving effectiveness of concrete expanding agent under restrictive condition |
| CN106348643A (en) * | 2016-08-19 | 2017-01-25 | 桂林华越环保科技有限公司 | Modified concrete expansive agent |
| CN108249811A (en) * | 2018-02-02 | 2018-07-06 | 日照弗尔曼新材料科技有限公司 | A kind of concrete anticracking swelling agent and preparation method thereof |
Non-Patent Citations (1)
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| 陈寒斌等: ""用硅铝熟料配制低碱UEA-H混凝土高效膨胀剂"", 《混凝土》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113121152A (en) * | 2021-05-13 | 2021-07-16 | 南京茂汇盈科技有限公司 | Concrete expanding agent and preparation and use methods thereof |
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