CN109133992A - A kind of concrete shimizu finish magnesium phosphate cement matter protective coating and preparation method thereof - Google Patents
A kind of concrete shimizu finish magnesium phosphate cement matter protective coating and preparation method thereof Download PDFInfo
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- CN109133992A CN109133992A CN201810870739.6A CN201810870739A CN109133992A CN 109133992 A CN109133992 A CN 109133992A CN 201810870739 A CN201810870739 A CN 201810870739A CN 109133992 A CN109133992 A CN 109133992A
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- Prior art keywords
- concrete
- coating
- magnesium phosphate
- protective coating
- phosphate cement
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Classifications
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
- C04B41/71—Coating or impregnation for obtaining at least two superposed coatings having different compositions at least one coating being an organic material
Abstract
The invention belongs to building material technical fields, and in particular to a kind of concrete shimizu finish magnesium phosphate cement matter protective coating and preparation method thereof.The protective coating is made of primer coating and surface layer coating two parts, the primer coating each component is by mass percentage are as follows: magnesia 45~60%, potassium dihydrogen phosphate 15~25%, borax 3~5%, portland cement 3~5%, flyash 10~20%, cellulose ether 0.02~0.04%, water-solid ratio are 0.2~0.5；The surface layer coating be silane emulsion, be using octyltri-ethoxysilane, dodecyl sodium sulfate and water be raw material using ultrasonic emulsification preparation obtained by.Protective coating of the present invention has excellent caking property, volume stability, application property and weatherability, the endurance quality of concrete structure material can be effectively improved, the problems such as concrete structural surface for effectively solving to be served in natural environment is stained, durability reduces, has practical application value.
Description
Technical field
The invention belongs to building material technical fields, and in particular to a kind of concrete shimizu finish magnesium phosphate cement matter protection
Coating and preparation method thereof.
Background technique
It is served in erosion of the concrete structure vulnerable to hazardous medium of natural environment, causes its surface to be stained resistance to structure
Long property reduces, to influence the appearance and service life of concrete structure.In order to improve the outer of concrete structure under Service Environment
Sight and service life, are handled frequently with concrete casing coating.Currently, most common concrete casing coating is mainly nothing
The polymer coatings such as polyureas, epoxy resin, the silane of the portland cement coating of machine class and organic.Although the above coating can
Improve the endurance quality of concrete structure, but also all has certain problems.Wherein, inorganic portland cement coating adhesion
It is poor with volume stability, easy shrinkage cracking；Organic type coating volatilization easy to aging, influences environmental and human health impacts.
Summary of the invention
The present invention is in view of the deficiencies of the prior art, and it is an object of the present invention to provide a kind of concrete shimizu finish magnesium phosphate cement matter is anti-
Protect coating and preparation method thereof.
For achieving the above object, the technical solution adopted by the present invention are as follows:
A kind of concrete shimizu finish magnesium phosphate cement matter protective coating, by primer coating and surface layer coating two parts group
At the primer coating each component is by mass percentage are as follows: magnesia 45~60%, potassium dihydrogen phosphate 15~25%, borax 3
~5%, portland cement 3~5%, flyash 10~20%, cellulose ether 0.02~0.04%, water-solid ratio are 0.2~0.5；
The surface layer coating is silane emulsion, and the silane emulsion is to be with octyltri-ethoxysilane, dodecyl sodium sulfate and water
Raw material prepares gained using ultrasonic emulsification.
In above scheme, the magnesia is industrial rubber grade high purity light magnesia powder, and content of MgO is greater than 90%.
In above scheme, the potassium dihydrogen phosphate is PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, KH2PO4Content is greater than 95%.
In above scheme, the borax is technical grade borax, Na2B4O7Content is greater than 95%.
In above scheme, the portland cement is P.O 42.5.
In above scheme, the flyash is II grade of flyash, loss on ignition≤5.0wt%, water demand ratio >=95wt%.
In above scheme, the cellulose ether is hydroxypropyl methyl cellulose ether, viscosity >=150,000 mPas.
In above scheme, the water meets the requirement of JGJ63 " concrete mixing water supply standard ".
In above scheme, each raw material component of the silane emulsion is by mass percentage are as follows: octyltri-ethoxysilane
60~70%, dodecyl sodium sulfate 1.5~2.5%, surplus are deionized water.
The preparation method of above-mentioned concrete shimizu finish magnesium phosphate cement matter protective coating, specifically comprises the following steps:
(1) weighed magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash and cellulose ether are poured into mortar
3~5min of dry mixing in blender obtains primer coating dry mash；
(2) primer coating dry mash and water are mixed in a certain ratio obtained primer coating slurry；
(3) first concrete surface is cleared up and is soaked before primer coating brushing, after basal plane saturation plane is dry, will be prepared
Good primer coating slurry is painted in two times on concrete sample basal plane, and coating mode is roller coating or blade coating；
(4) the spraying surface silane emulsion after primer coating surface drying, spraying method are mist spray, and spraying should be uniform；To bottom
With after the equal drying and forming-film of surface layer coating up to concrete shimizu finish magnesium phosphate cement matter protective coating.
The principle that the present invention uses are as follows: the present invention intends forming a kind of phosphoric acid as physical barriers in concrete structural surface
Magnesium cement-silane composite coating to prevent hazardous medium from invading concrete substrate, and then improves the endurance quality of concrete structure
And finishing effect, in which: the 1) mechanism of action of primer coating: primer coating is using magnesia and potassium dihydrogen phosphate as base-material, the two
Hydration reaction forms the MgKPO with excellent caking property and volume stability4；Magnesia and potassium dihydrogen phosphate hydration reaction are fast
Speed adds borax as retarder, in entire aquation system, borax is electric to make primer coating have excellent application property
B from generation4O7 2-Absorption is wrapped in the active site on magnesium oxide particle surface, prevents the hydrolysis of magnesia；Magnesia and phosphoric acid
Color after dihydro nak response is in khaki, and color and concrete tone are inconsistent, in order to make primer coating have concrete
Tone, adds portland cement and flyash is toner, generates with the incorporation of portland cement and flyash, aquation
The products such as C-S-H gel and MgKPO4It intersects, that is, improves the color of bottom magnesium phosphate cement coating material, and make base
Body is more closely knit；And the incorporation of polymer fiber element ether, brittleness existing for magnesium phosphate cement can be improved greatly and impact resistance is poor
Problem can form reticular structure in the coating, enhance the toughness of coating.2) mechanism of action of surface layer coating: surface layer coating is
The small molecule structure of silane emulsion, silane penetrates into it effectively in high density substrate, reduces of concrete surface
Power increases the hydrophobicity of concrete surface；Meanwhile silane is when with bottom cement matrix coating reaction, first and in pore
Water reaction, alkoxy hydrolyzes to form silanol, and subsequent silanol molecules lose water and are condensed into silicone resin, and dry in coating
Dry period is bound in primer coating, to provide good waterproof effect, enhances the hardness and toughness of coating, prevents coating
Cracking and the intrusion for hindering hazardous medium.
Beneficial effects of the present invention are as follows:
(1) concrete shimizu finish magnesium phosphate cement matter protective coating of the present invention is by primer coating and surface layer coating two
Part form, wherein primer coating be magnesium phosphate cement matter coating, with excellent caking property, volume stability and its with
The preferable volume compatibility of concrete；Surface layer coating is silane emulsion coating, has not only protected the true qualities of primer coating, but also improve
The hydrophobicity of coating, enhances the hardness, toughness and weather resistance of coating.
(2) concrete shimizu finish magnesium phosphate cement matter protective coating of the present invention, preparation and construction technology are simple, and
With excellent caking property, volume stability, application property and weatherability, the durability of concrete structure material can be effectively improved
Can, and keep concrete structure appearance consistent with concrete primary colors, it can effectively solve the concrete structure being served in natural environment
The problems such as surface is stained, durability reduces, has practical application value.
Detailed description of the invention:
Fig. 1,2 are influence of the concrete shimizu finish magnesium phosphate cement matter protective coating to concrete sample appearance.Wherein,
Fig. 1 is concrete test block, and Fig. 2 is concrete test plate (panel)；It (a) is uncoated test specimen；It (b) is to have coating specimens.
Specific embodiment
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but it is of the invention
Content is not limited solely to the following examples.
Embodiment 1
A kind of concrete shimizu finish magnesium phosphate cement matter protective coating, is prepared via a method which to obtain:
1) primer coating raw material proportioning: magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash mass ratio be
57:20:4:4:15, cellulose ether volume are the 0.03% of above-mentioned all material gross mass, water-solid ratio=0.3；Surface layer coating is
Silane emulsion, each material quality percentage are as follows: octyltri-ethoxysilane 65%, dodecyl sodium sulfate 2%, surplus be go from
Sub- water after mixing each raw material component, prepares silane using ultrasonic wave (ultrasound condition: 40kHz × 100W, 20min) emulsification
Lotion；
2) it will be fallen by weighed magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash and cellulose ether is measured
Enter 3~5min of dry mixing in mortar mixer, obtains concrete shimizu finish magnesium phosphate cement matter protective coating primer coating dry powder
Material adds water and stirs 3~5min, obtains concrete shimizu finish magnesium phosphate cement matter protective coating primer coating slurry；
3) it before primer coating brushing needs that concrete surface is cleared up and soaked, removes laitance, the dirt of concrete surface
Object and dust etc. are contaminated, then concrete surface is soaked, is divided to two for prepared bottom coating after basal plane saturation plane is dry
Secondary to be painted on concrete sample basal plane, coating mode selects roller coating；
4) the spraying surface silane emulsion after primer coating surface drying, spraying method are mist spray, spraying should uniformly, to bottom and
Up to concrete shimizu finish magnesium phosphate cement matter protective coating after surface layer coating drying and forming-film.
It prepares gained concrete shimizu finish magnesium phosphate cement matter protective coating to the present embodiment to be tested for the property, as a result
As shown in table 1~6 and Fig. 1.
The workability of 1 concrete shimizu finish magnesium phosphate protective coating of table
The filming performance of 2 concrete shimizu finish magnesium phosphate protective coating of table
Mechanical performance of concrete under the effect of 3 concrete shimizu finish magnesium phosphate protective coating of table
Concrete impermeability under the effect of 4 concrete shimizu finish magnesium phosphate protective coating of table
Concrete antifreezing performance under the effect of 5 concrete shimizu finish magnesium phosphate protective coating of table
Agent on crack resistance of concrete chloride permeability and sulfate resistance under the effect of 6 concrete shimizu finish magnesium phosphate protective coating of table
Erosion performance
| C50 concrete sample | Electric flux/C | 90d compression strength loss/% | 180d compression strength loss/% |
| It is uncoated | 140.0 | 12.8 | 25.5 |
| There is coating | 91.3 | 3.2 | 4.1 |
Concrete shimizu finish magnesium phosphate cement matter protective coating has excellent glue it can be seen from table 1~6 and Fig. 1
Knot property, volume stability, application property and weatherability, and appearance and concrete primary colors are almost the same.Meanwhile concrete shimizu finish
Magnesium phosphate cement matter protective coating can effectively improve the mechanical property and endurance quality (including impermeabilisation of concrete structure material
Performance, anti-freezing property and sulfate resistance etch performance).
Embodiment 2
A kind of concrete shimizu finish magnesium phosphate cement matter protective coating, is prepared via a method which to obtain:
1) primer coating match: magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash mass ratio be 54:
18:4:4:20, cellulose ether volume are the 0.03% of above-mentioned all material gross mass, water-solid ratio=0.3；Surface layer coating is silane
Lotion, each material quality percentage are as follows: octyltri-ethoxysilane 65%, dodecyl sodium sulfate 2%, surplus are deionization
Water after mixing each raw material component, prepares silane cream using ultrasonic wave (ultrasound condition: 40kHz × 100W, 20min) emulsification
Liquid；
2) it will be fallen by weighed magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash and cellulose ether is measured
Enter 3~5min of dry mixing in mortar mixer, obtains concrete shimizu finish magnesium phosphate cement matter protective coating primer coating dry powder
Material adds water and stirs 3~5min, obtains concrete shimizu finish magnesium phosphate cement matter protective coating primer coating slurry；
3) it before primer coating brushing needs that concrete surface is cleared up and soaked, removes laitance, the dirt of concrete surface
Object and dust etc. are contaminated, then concrete surface is soaked, is divided to two for prepared bottom coating after basal plane saturation plane is dry
Secondary to be painted on concrete sample basal plane, coating mode selects roller coating；
4) the spraying surface silane emulsion after primer coating surface drying, spraying method are mist spray, spraying should uniformly, to bottom and
Up to concrete shimizu finish magnesium phosphate cement matter protective coating after surface layer coating drying and forming-film.
It prepares gained concrete shimizu finish magnesium phosphate cement matter protective coating to the present embodiment to be tested for the property, as a result
As shown in table 7~12 and Fig. 2.
The workability of 7 concrete shimizu finish magnesium phosphate protective coating of table
The filming performance of 8 concrete shimizu finish magnesium phosphate protective coating of table
Mechanical performance of concrete under the effect of 9 concrete shimizu finish magnesium phosphate protective coating of table
Concrete impermeability under the effect of 10 concrete shimizu finish magnesium phosphate protective coating of table
Concrete antifreezing performance under the effect of 11 concrete shimizu finish magnesium phosphate protective coating of table
Agent on crack resistance of concrete chloride permeability and sulfate resistance under the effect of 12 concrete shimizu finish magnesium phosphate protective coating of table
Erosion performance
| C50 concrete sample | Electric flux/C | 90d compression strength loss/% | 180d compression strength loss/% |
| It is uncoated | 140.0 | 12.8 | 25.5 |
| There is coating | 90.5 | 2.8 | 3.7 |
Concrete shimizu finish magnesium phosphate cement matter protective coating has excellent glue it can be seen from table 7~12 and Fig. 2
Knot property, volume stability, application property and weatherability, and appearance and concrete primary colors are almost the same.Meanwhile concrete shimizu finish
Magnesium phosphate cement matter protective coating can effectively improve the mechanical property and endurance quality (including impermeabilisation of concrete structure material
Performance, anti-freezing property and sulfate resistance etch performance).
Obviously, above-described embodiment is only intended to clearly illustrate made example, and is not the limitation to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation or change therefore amplified
It moves within still in the protection scope of the invention.
Claims (9)
1. a kind of concrete shimizu finish magnesium phosphate cement matter protective coating, which is characterized in that by primer coating and surface layer coating
Two parts composition, the primer coating each component is by mass percentage are as follows: magnesia 45 ~ 60%, potassium dihydrogen phosphate 15 ~ 25%,
Borax 3 ~ 5%, portland cement 3 ~ 5%, flyash 10 ~ 20%, cellulose ether 0.02 ~ 0.04%, water-solid ratio are 0.2 ~ 0.5；It is described
Surface layer coating be silane emulsion, the silane emulsion be using octyltri-ethoxysilane, dodecyl sodium sulfate and water as raw material,
Gained is prepared using ultrasonic emulsification.
2. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the oxidation
Magnesium is industrial rubber grade high purity light magnesia powder, and content of MgO is greater than 90%.
3. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the phosphoric acid
Potassium dihydrogen is PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, KH2PO4Content is greater than 95%.
4. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the borax
For technical grade borax, Na2B4O7Content is greater than 95%.
5. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the silicic acid
Salt cement is P.O 42.5.
6. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the fine coal
Ash is II grade of flyash, loss on ignition≤5.0wt%, water demand ratio >=95wt%.
7. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the fiber
Plain ether is hydroxypropyl methyl cellulose ether, viscosity >=150,000 mPas.
8. concrete shimizu finish magnesium phosphate cement matter protective coating according to claim 1, which is characterized in that the silane
The each raw material component of lotion is by mass percentage are as follows: and octyltri-ethoxysilane 60 ~ 70%, dodecyl sodium sulfate 1.5 ~
2.5%, surplus is deionized water.
9. the preparation method of any concrete shimizu finish magnesium phosphate cement matter protective coating of claim 1 ~ 8, feature
It is, specifically comprises the following steps:
(1) weighed magnesia, potassium dihydrogen phosphate, borax, portland cement, flyash and cellulose ether are poured into mortar stirring
3 ~ 5min of dry mixing in machine obtains primer coating dry mash；
(2) primer coating dry mash and water are mixed in a certain ratio obtained primer coating slurry；
(3) first concrete surface is cleared up and is soaked before primer coating brushing, it, will be prepared after basal plane saturation plane is dry
Primer coating slurry is painted in two times on concrete sample basal plane, and coating mode is roller coating or blade coating；
(4) the spraying surface silane emulsion after primer coating surface drying, spraying method are mist spray, and spraying should be uniform；To bottom and face
Up to concrete shimizu finish magnesium phosphate cement matter protective coating after the layer equal drying and forming-film of coating.
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| CN201810870739.6A CN109133992B (en) | 2018-08-02 | 2018-08-02 | Concrete fair-faced magnesium phosphate cement protective coating and preparation method thereof |
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| CN201810870739.6A CN109133992B (en) | 2018-08-02 | 2018-08-02 | Concrete fair-faced magnesium phosphate cement protective coating and preparation method thereof |
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| CN109133992A true CN109133992A (en) | 2019-01-04 |
| CN109133992B CN109133992B (en) | 2020-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113896504A (en) * | 2021-10-29 | 2022-01-07 | 重庆交通大学 | Phosphorus-magnesium cementing material/polymer composite coating and construction method thereof |
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