CN116891647A - Inorganic coating based on calcium silicate and preparation method thereof - Google Patents
Inorganic coating based on calcium silicate and preparation method thereof Download PDFInfo
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- CN116891647A CN116891647A CN202310948272.3A CN202310948272A CN116891647A CN 116891647 A CN116891647 A CN 116891647A CN 202310948272 A CN202310948272 A CN 202310948272A CN 116891647 A CN116891647 A CN 116891647A
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- calcium silicate
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- inorganic coating
- chain alkyl
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- 238000000576 coating method Methods 0.000 title claims abstract description 95
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 92
- 239000011248 coating agent Substances 0.000 title claims abstract description 89
- 239000000378 calcium silicate Substances 0.000 title claims abstract description 87
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000003763 carbonization Methods 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 23
- -1 alkyl alkoxy silane Chemical compound 0.000 claims abstract description 21
- 229910000077 silane Inorganic materials 0.000 claims abstract description 20
- 230000036571 hydration Effects 0.000 claims abstract description 11
- 238000006703 hydration reaction Methods 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 10
- 239000011707 mineral Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 9
- 239000002440 industrial waste Substances 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000012241 calcium silicate Nutrition 0.000 claims description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 239000000839 emulsion Substances 0.000 claims description 35
- 239000002253 acid Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 22
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 19
- 239000002270 dispersing agent Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 claims description 6
- 229960003493 octyltriethoxysilane Drugs 0.000 claims description 6
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 3
- SCPWMSBAGXEGPW-UHFFFAOYSA-N dodecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCC[Si](OC)(OC)OC SCPWMSBAGXEGPW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002174 Styrene-butadiene Substances 0.000 claims description 2
- FZVXUPLDQNBUQZ-UHFFFAOYSA-N [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] FZVXUPLDQNBUQZ-UHFFFAOYSA-N 0.000 claims description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- ARHMMDOXGIIARL-UHFFFAOYSA-N calcium;dihydroxy(dioxido)silane Chemical compound [Ca+2].O[Si](O)([O-])[O-] ARHMMDOXGIIARL-UHFFFAOYSA-N 0.000 claims description 2
- 238000003618 dip coating Methods 0.000 claims description 2
- 239000011115 styrene butadiene Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 239000008030 superplasticizer Substances 0.000 claims description 2
- 238000010345 tape casting Methods 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 abstract description 13
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 40
- 238000003756 stirring Methods 0.000 description 18
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- 238000012360 testing method Methods 0.000 description 14
- 239000002002 slurry Substances 0.000 description 12
- 239000000843 powder Substances 0.000 description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910021487 silica fume Inorganic materials 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses an inorganic coating based on calcium silicate and a preparation method thereof. The raw materials of the inorganic coating based on calcium silicate comprise: a calcium silicate material and a long chain alkyl alkoxysilane; wherein the calcium silicate material is at least one of calcium silicate minerals with low hydration activity and high carbonization activity or industrial waste residues containing at least 60wt% of the calcium silicate minerals with low hydration activity and high carbonization activity; the long-chain alkyl alkoxy silane is long-chain alkyl alkoxy silane with carbon chain containing 8-20 carbons. On the basis that the existing common inorganic coating has the advantages of high mechanical property, strong weather resistance and the like, the adhesive property and the erosion resistance of the inorganic coating are further effectively improved, and the problems of weak adhesive property and poor erosion resistance of the existing inorganic coating are solved.
Description
Technical Field
The invention relates to the technical field of inorganic coating materials, in particular to an inorganic coating based on calcium silicate and a preparation method thereof.
Background
The coating material is mainly used for protecting the surfaces of cement concrete, steel products and wood, preventing the surfaces of the products from being scratched, spoiled, rusted, cracked and the like, and preventing corrosive substances such as salt ions and the like from penetrating into the interior to cause functional failure. Among the coating materials, the materials can be classified into organic and inorganic materials.
The organic coating can obtain excellent erosion resistance and bonding performance, and is widely used in society. But most of the organic coating releases pungent gas in the construction process, a large amount of organic matters in the coating are not easily degraded by natural environment, so that environmental burden is caused, stripping and bulge damage are easy to develop, and the stability and weather resistance of the organic coating are poor. The inorganic coating is mostly made of sodium silicate, calcium silicate and the like, has higher stability, generally has stronger weather resistance, has strong mechanical property and is not easy to damage although not having excellent erosion resistance and bonding performance. It can be seen that the mechanical properties and weather resistance of the inorganic coating are generally better than those of the general organic coating, but the weak adhesion property and poor erosion resistance result in that the inorganic coating cannot be widely used.
Therefore, in order to improve the important functions such as the bonding performance between the inorganic coating and the matrix, effective functional admixtures or improved preparation means must be discovered.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides an inorganic coating based on calcium silicate and a preparation method thereof, which solve the technical problems of weak bonding performance and poor erosion resistance of the inorganic coating in the prior art.
In a first aspect, the present invention provides a calcium silicate-based inorganic coating, the calcium silicate-based inorganic coating comprising: a calcium silicate material and a long chain alkyl alkoxysilane; wherein,,
the calcium silicate material is at least one of calcium silicate mineral with low hydration activity and high carbonization activity or industrial waste residue containing at least 60wt% of calcium silicate mineral with low hydration activity and high carbonization activity;
the long-chain alkyl alkoxy silane is long-chain alkyl alkoxy silane with carbon chain containing 8-20 carbons.
In a second aspect, the present invention provides a method for preparing an inorganic coating based on calcium silicate, comprising the steps of:
uniformly mixing a calcium silicate material, an inorganic dispersing agent, a polycarboxylic acid high-efficiency water reducing agent, polymer emulsion, long-chain alkyl alkoxy silane and water to obtain an inorganic coating based on calcium silicate;
the inorganic coating based on calcium silicate is coated on the surface of a substrate and is carbonized and cured to form the inorganic coating based on calcium silicate.
Compared with the prior art, the invention has the beneficial effects that:
on the basis that the existing common inorganic coating has the advantages of high mechanical property, strong weather resistance and the like, the adhesive property and the erosion resistance of the inorganic coating are further effectively improved, and the problems of weak adhesive property and poor erosion resistance of the existing inorganic coating are solved.
Drawings
FIG. 1 is a graph showing the results of the flow property test of the inorganic paints obtained in example 1 and comparative examples 1, 3, 4, and 6 of the present invention;
FIG. 2 is a graph of the microtopography of the coating formed in comparative example 1 of the present invention;
FIG. 3 is a graph of the microtopography of the coating formed in example 1 of the present invention;
FIG. 4 is a graph of the results of the anti-chloride ion diffusion coefficient (NEL) test of the coatings formed in example 1 and comparative examples 1, 4 and 7 of the present invention;
fig. 5 is a graph showing the results of the bond strength test of the coatings formed in example 1 and comparative examples 1, 4 and 7 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In a first aspect, the present invention provides a calcium silicate-based inorganic coating, the calcium silicate-based inorganic coating comprising: calcium silicate material and long chain alkyl alkoxy silane.
According to the invention, the combination degree of the inorganic coating and the matrix is enhanced by adding the long-chain alkyl alkoxy silane into the inorganic coating based on calcium silicate, so that the bonding performance and the erosion resistance of the coating are further improved.
In this embodiment, the long-chain alkylalkoxysilane is a long-chain alkylalkoxysilane having 8 to 20 carbon atoms, and may be one or more of octyltriethoxysilane, octyltrimethoxysilane, dodecyltrimethoxysilane, and the like.
In this embodiment, the calcium silicate material is at least one of a calcium silicate mineral having low hydration activity and high carbonization activity or an industrial residue containing at least 60wt% of a calcium silicate mineral having low hydration activity and high carbonization activity; the calcium silicate mineral with low hydration activity and high carbonization activity is at least one of gamma-type dicalcium silicate, monocalcium silicate and tricalcium disilicate; the industrial waste residue can be materials with low hydration activity and high carbonization activity, such as steel slag or magnesium slag.
In this embodiment, the calcium silicate-based inorganic coating layer is formed by uniformly mixing raw materials of the calcium silicate-based inorganic coating layer, coating the raw materials on the surface of the substrate, and carbonizing and curing the raw materials.
The invention is not limited to the manner of coating and may be selected by those skilled in the art according to the actual circumstances. For example, spray coating, dip coating, knife coating, and the like may be employed. The inventors found during the test that the addition of long-chain alkylalkoxysilane resulted in an increase in the viscosity of the slurry, while the adhesive properties could be improved, excessive addition was not conducive to smooth spraying. Therefore, if a spraying mode is adopted, the addition amount of the long-chain alkyl alkoxy silane needs to be controlled.
In some embodiments of the present invention, spraying is adopted, and the mass ratio of the calcium silicate material to the long-chain alkyl alkoxy silane is 1: (0.002 to 0.04), preferably 1: (0.005-0.02). In this ratio range, a fluid slurry can be formed, ensuring smooth progress of the spraying process.
In the present embodiment, the raw material for the inorganic coating layer based on calcium silicate further comprisesThe method comprises the following steps: an inorganic dispersant. According to the invention, the fluidity of the slurry can be improved by adding an appropriate amount of inorganic dispersing agent, so that the spraying operation is smoother and smoother, and the pores in the coating are filled, so that the coating is more compact; however, excessive addition may result in reduced fluidity of the coating slurry. Further, the inorganic dispersant is silica micropowder. Further, the specific surface area of the micro silicon powder is 20000 to 25000m 2 /kg; the dosage ratio of the calcium silicate material to the inorganic dispersant is 1: (0.01 to 0.15), and further 1: (0.05-0.1).
In this embodiment, the raw materials for the calcium silicate-based inorganic coating layer further include: polycarboxylic acid high-efficiency water reducer. According to the invention, through adding the polycarboxylic acid high-efficiency water reducer, polycarboxylic acid molecules are adsorbed with calcium silicate particles through electrostatic adsorption, a water film formed by hydrophilic branched chains of the polycarboxylic acid molecules plays a lubricating role, and a long chain structure of the branched chains can provide a steric hindrance effect, so that the agglomeration phenomenon of powder particles is improved, and the fluidity of slurry is improved. Further, the solid content of the polycarboxylic acid high-efficiency water reducer is 10% -60%, and further 40% -50%; the mass ratio of the calcium silicate material to the polycarboxylic acid high-efficiency water reducer is 1: (0.01-0.05).
In this embodiment, the raw materials for the calcium silicate-based inorganic coating layer further include: a polymer emulsion. The invention improves sedimentation delamination in the slurry by adding a polymer emulsion. Further, the polymer emulsion is at least one of acrylic emulsion, pure acrylic emulsion and styrene-butadiene emulsion. Further, the solid content of the polymer emulsion is 40% -50%; the dosage ratio of the calcium silicate material to the polymer emulsion is 1: (0.005-0.025).
In some preferred embodiments of the present invention, the above-mentioned calcium silicate-based inorganic coating comprises, in parts by weight: 50 to 70 parts of calcium silicate material, 3 to 5 parts of inorganic dispersant, 1.5 to 3 parts of polycarboxylic acid high-efficiency water reducer, 1.0 to 2.0 parts of polymer emulsion, 0.2 to 2.0 parts of long-chain alkyl alkoxy silane and 22 to 28 parts of water.
In a second aspect, the present invention provides a method for preparing an inorganic coating based on calcium silicate, comprising the steps of:
s1, uniformly mixing a calcium silicate material, an inorganic dispersing agent, a polycarboxylic acid high-efficiency water reducing agent, polymer emulsion, long-chain alkyl alkoxy silane and water to obtain an inorganic coating based on calcium silicate;
s2, coating the inorganic coating based on the calcium silicate on the surface of a substrate, and carbonizing and curing to form the inorganic coating based on the calcium silicate.
In this embodiment, the step of uniformly mixing the calcium silicate material, the inorganic dispersant, the polycarboxylic acid superplasticizer, the polymer emulsion, the long-chain alkyl alkoxysilane and the water specifically includes:
s11, uniformly mixing a calcium silicate material and an inorganic dispersing agent to obtain a first mixture;
s12, uniformly mixing the polycarboxylic acid high-efficiency water reducer and water to obtain a second mixture;
s13, uniformly mixing the first mixture and the second mixture to obtain a third mixture;
s14, adding polymer emulsion into the third mixture in batches, and uniformly mixing to obtain a fourth mixture;
s15, adding long-chain alkyl alkoxy silane into the fourth mixture, and uniformly mixing to obtain the inorganic coating based on calcium silicate.
In step S11, uniformly mixing the calcium silicate material and the inorganic dispersing agent in a stirring manner; the step is to achieve the purpose of pre-dispersing, so that the solid powder is more uniformly distributed. In some embodiments of the invention, the stirring rod is used for stirring for 30-60 seconds at a constant speed manually.
In the step S12, the polycarboxylic acid high-efficiency water reducer and water are uniformly mixed in a stirring mode; the step is to uniformly disperse the polycarboxylic acid high-efficiency water reducer in water. In some embodiments of the invention, the stirring rod is used for stirring at a constant speed manually for 5-10 seconds.
In step S13, uniformly mixing the first mixture and the second mixture by stirring; the stirring step is to sufficiently disperse the solid particles and sufficiently mix them with the liquid.
In step S14, the polymer emulsion is added to the third mixture in batches and mixed uniformly by stirring. The step is to break the network structure of the emulsion by long-time high-speed whipping, improve the fluidity and prevent the slurry from losing the fluidity after adding the long-chain alkyl alkoxy silane. In some embodiments of the invention, a hand-held stirrer is used, the stirring speed is 100-150 r/min, each time the emulsion is added, the stirring time is not less than 30s after each time the emulsion is added, and the emulsion is added.
In step S15, long-chain alkylalkoxysilane is added to the fourth mixture and mixed uniformly by stirring. This step is to thoroughly mix the fourth mixture with the long chain alkylalkoxysilane. In some embodiments of the invention, a hand-held stirrer is used, the stirring speed is 100-150 r/min, and the stirring time is not less than 30s.
The present invention is not limited in the kind of the substrate, and those skilled in the art can select according to actual conditions. For example, the inorganic coating of the present invention can be applied to the surface of most building materials such as cement concrete substrates, steel substrates, wood substrates, and the like.
In this embodiment, the carbonization curing conditions are: the carbonization temperature is 0-50 ℃, the relative humidity is 10-70%, the volume concentration of carbon dioxide is 60-99.8%, the relative partial pressure is 0-0.3 MPa, and the curing time is more than or equal to 12h.
In some embodiments of the invention, the carbonization curing conditions are: the carbonization temperature is 10-50 ℃, the relative humidity is 50-70%, the volume concentration of carbon dioxide is 60-99.8%, the relative partial pressure is 0.1-0.3 MPa, and the curing time is 18-36 h.
Example 1
The embodiment provides a preparation method of an inorganic coating based on calcium silicate, which comprises the following steps:
(1) 65g of dicalcium silicate and 5g of silica fume are mixed into uniform powder;
(2) 1.8g of polycarboxylic acid high-efficiency water reducer (solid content is 40 percent) and 28g of water are prepared into uniform solution, and the uniform solution is poured into the powder and stirred for 30s at the speed of 100 r/min;
(3) 1.5g of acrylic emulsion (solid content 45%) is added in two times and stirred uniformly;
(4) 1.0g of octyl triethoxysilane is added, and stirring is continued at the speed of 120r/min for 60s, so as to obtain a coating;
(5) The paint is evenly sprayed on the surface of the cement concrete matrix by using a pneumatic spray gun, and is placed into a carbonization curing container for carbonization curing under the carbon dioxide atmosphere, wherein the carbon dioxide concentration is 95%, the carbonization relative partial pressure is 0.1MPa, the temperature is 25 ℃, the relative humidity is 60%, and the curing is carried out for 24 hours.
Example 2
The embodiment provides a preparation method of an inorganic coating based on calcium silicate, which comprises the following steps:
(1) 50g of dicalcium silicate and 3g of silica fume are mixed into uniform powder;
(2) 1.5g of polycarboxylic acid high-efficiency water reducer (solid content is 40 percent) and 22g of water are prepared into uniform solution, and the uniform solution is poured into the powder and stirred for 30s at the speed of 100 r/min;
(3) 1g of acrylic emulsion (solid content 45%) is added in two times and stirred uniformly;
(4) Adding 0.3g of octyl trimethoxy silane, and continuously stirring at the speed of 120r/min for 60s to obtain a coating;
(5) The pneumatic spray gun is used for uniformly spraying the coating on the surface of the wood board substrate, the wood board substrate is placed into a carbonization curing container for carbonization curing under the carbon dioxide atmosphere, the carbon dioxide concentration is 60%, the carbonization relative partial pressure is 0.3MPa, the temperature is 50 ℃, the relative humidity is 50%, and the curing is carried out for 18 hours.
Example 3
The embodiment provides a preparation method of an inorganic coating based on calcium silicate, which comprises the following steps:
(1) Mixing 70g of steel slag and 4g of micro silicon powder into uniform powder;
(2) 3g of polycarboxylic acid high-efficiency water reducer (solid content is 40 percent) and 25g of water are prepared into uniform solution, and the uniform solution is poured into the powder and stirred for 30s at the speed of 100 r/min;
(3) 1.6g of acrylic emulsion (solid content 45%) is added in two times and stirred uniformly;
(4) Adding 1.5g of dodecyl trimethoxy silane, and continuously stirring at the speed of 120r/min for 60s to obtain a coating;
(5) The paint is evenly sprayed on the surface of the wood substrate by using a pneumatic spray gun, and is placed into a carbonization curing container for carbonization curing under the carbon dioxide atmosphere, wherein the carbon dioxide concentration is 80%, the carbonization relative partial pressure is 0.2MPa, the temperature is 30 ℃, the relative humidity is 70%, and the curing is carried out for 36h.
Comparative example 1
Comparative example 1 differs from example 1 only in that octyltriethoxysilane was not added during the preparation of the inorganic coating of comparative example 1.
Comparative example 2
Comparative example 2 differs from example 1 only in that the amount of octyltriethoxysilane incorporated during the preparation of the inorganic coating of comparative example 2 is 3.0g.
Comparative example 3
Comparative example 3 differs from example 1 only in that no fine silica powder was added during the preparation of the inorganic coating of comparative example 3.
Comparative example 4
Comparative example 4 differs from example 1 only in that no acrylic emulsion was added during the preparation of the inorganic coating of comparative example 4.
Comparative example 5
Comparative example 5 differs from example 1 only in that the amount of acrylic emulsion blended during the preparation of the inorganic coating of comparative example 5 was 2.0g.
Comparative example 6
Comparative example 6 differs from example 1 only in the preparation process of the inorganic coating material; the method comprises the following steps:
(1) 65g of dicalcium silicate and 5g of silica fume are mixed into uniform powder;
(2) 1.8g of polycarboxylic acid high-efficiency water reducer (solid content is 40 percent) and 28g of water are prepared into uniform solution, and the uniform solution is poured into the powder and stirred for 30s at the speed of 100 r/min;
(3) 1.5g of acrylic emulsion (45% solids) and 1.0g of octyltriethoxysilane were added and stirring was continued at 120r/min for about 120s to give a homogeneously dispersed coating.
Comparative example 7
Comparative example 7 differs from example 1 only in that comparative example 7 was carbonized for 6 hours in a carbonized curing environment with a carbon dioxide concentration of 95%, a carbonization relative partial pressure of 0.1MPa, a temperature of 25 ℃, and a relative humidity of 60%.
Test group 1
The inorganic coatings obtained in example 1 and comparative examples 1 to 6 were subjected to flow property test (fig. 1) and sedimentation observation (table 1). Wherein, the fluidity of the slurry is judged to be good by testing the viscosity of the slurry through a rheometer; and judging the normal-temperature storage stability of the paint by observing the slurry state after 48 hours.
Among them, comparative examples 2 and 5 were not capable of forming a flowable slurry, so performance test was not performed; comparative examples 3 and 6 failed to form a slurry with good fluidity, and were unsuitable for use in spray coating operations, so that subsequent durability and bond strength related tests were not performed.
TABLE 1
| Group of | Sealing and standing for 48 hours at room temperature, and then obtaining a slurry state |
| Example 1 | No solid-liquid separation phenomenon |
| Comparative example 1 | No solid-liquid separation phenomenon |
| Comparative example 2 | \ |
| Comparative example 3 | No solid-liquid separation phenomenon |
| Comparative example 4 | The solid-liquid separation occursElephant image |
| Comparative example 5 | \ |
| Comparative example 6 | No solid-liquid separation phenomenon |
As can be seen from FIG. 1 and Table 1, the paint formed in example 1 of the present invention has good comprehensive properties, and has good fluidity and storage stability at normal temperature.
Test group 2
Microstructure observations were made on the coatings obtained in example 1 and comparative example 1 described above.
In the carbonization maintenance process, calcium ions are separated out from the calcium silicate material in a solution environment, and carbonate ions provided by carbon dioxide dissolution react with the calcium ions to form calcium carbonate, so that the main mechanical properties of the inorganic coating are provided. The morphology of the coated calcium carbonate in fig. 2 and 3 was observed to show that the addition of long chain alkyl alkoxysilane led to the development of calcium carbonate into a typical calcite crystal morphology. The long-chain alkyl alkoxy silane can be catalyzed under the alkaline condition formed by the hydrolysis of calcium silicate, the alkoxy at one end is automatically hydrolyzed to generate active silicon hydroxyl, the active silicon hydroxyl is condensed with the hydroxyl on the surfaces of calcium carbonate and calcium silicate to form a chemical bond, and the long-chain alkyl at the other end of the molecular chain is oriented on the surface of the material to form a hydrophobic layer. This phenomenon is presumed to lead to a slow dissolution of calcium ions of calcium silicate, a reduced supersaturation value in the solution, and a preference for forming calcite crystal forms. And the alkoxy can form chemical bonding on the surface of the calcium carbonate, so that the surface of the generated calcium carbonate has hydrophobicity, and the coating has better erosion resistance.
Test group 3
The coatings obtained in example 1, comparative example 4 and comparative example 7 described above were subjected to durability-related tests, with the following criteria:
test of chloride ion erosion resistance: JCT 1086-2008.
As can be seen from fig. 4, the chlorine ion erosion resistance of example 1 is stronger than that of comparative examples 1, 4 and 7, which shows that the method is advantageous for enhancing the durability of the coating, and can significantly improve the chlorine ion erosion resistance of the coating, but requires a certain carbonization maintenance time to obtain a coating structure with complete performance.
Test group 4
The coatings obtained in example 1, comparative example 4 and comparative example 7 described above were subjected to bond strength testing.
As can be seen from fig. 5, example 1 can significantly improve the bonding degree between the inorganic coating and the substrate by 50% as compared with comparative example 1. The reason for this may be that calcite type calcium carbonate has a high hardness (H M =3), the mechanical properties of the coating can be enhanced; meanwhile, chemical bonding between the long-chain alkyl alkoxy silane and the surface of the matrix is favorable for improving the bonding performance.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (10)
1. A calcium silicate-based inorganic coating, characterized in that the raw materials of the calcium silicate-based inorganic coating comprise: a calcium silicate material and a long chain alkyl alkoxysilane; wherein,,
the calcium silicate material is at least one of calcium silicate minerals with low hydration activity and high carbonization activity or industrial waste residues containing at least 60 weight percent of the calcium silicate minerals with low hydration activity and high carbonization activity;
the long-chain alkyl alkoxy silane is long-chain alkyl alkoxy silane with carbon chain containing 8-20 carbons.
2. The inorganic calcium silicate-based coating according to claim 1, wherein the long chain alkyl alkoxysilane is one or more of octyl triethoxysilane, octyl trimethoxysilane, dodecyl trimethoxysilane; the calcium silicate mineral with low hydration activity and high carbonization activity is at least one of gamma-type dicalcium silicate, monocalcium silicate and tricalcium disilicate.
3. The inorganic calcium silicate-based coating according to claim 1, wherein the mass ratio of the calcium silicate material to the long chain alkyl alkoxysilane is 1: (0.002-0.04).
4. The inorganic calcium silicate-based coating according to claim 1, wherein the raw materials of the inorganic calcium silicate-based coating further comprise: at least one of water, an optional inorganic dispersant, a polycarboxylic acid high-efficiency water reducing agent and a polymer emulsion.
5. The inorganic coating based on calcium silicate according to claim 4, wherein the inorganic dispersant is a silica micropowder and the ratio of the amount of calcium silicate material to inorganic dispersant is 1: (0.01-0.15); the solid content of the polycarboxylic acid high-efficiency water reducer is 10% -60%, and the mass ratio of the calcium silicate material to the polycarboxylic acid high-efficiency water reducer is 1: (0.01-0.05); the polymer emulsion is at least one of acrylic emulsion, pure acrylic emulsion and styrene-butadiene emulsion, the solid content of the polymer emulsion is 40% -50%, and the dosage ratio of the calcium silicate material to the polymer emulsion is 1: (0.005-0.025).
6. The inorganic coating based on calcium silicate according to claim 1, wherein the inorganic coating based on calcium silicate comprises the following raw materials in parts by weight: 50 to 70 parts of calcium silicate material, 3 to 5 parts of inorganic dispersant, 1.5 to 3 parts of polycarboxylic acid high-efficiency water reducer, 1.0 to 2.0 parts of polymer emulsion, 0.2 to 2.0 parts of long-chain alkyl alkoxy silane and 22 to 28 parts of water.
7. A method of preparing the calcium silicate-based inorganic coating according to claim 6, comprising the steps of:
uniformly mixing a calcium silicate material, an inorganic dispersing agent, a polycarboxylic acid high-efficiency water reducing agent, polymer emulsion, long-chain alkyl alkoxy silane and water to obtain an inorganic coating based on calcium silicate;
and (3) coating the inorganic coating based on the calcium silicate on the surface of a substrate and carbonizing and curing to form the inorganic coating based on the calcium silicate.
8. The method for preparing a calcium silicate-based inorganic coating according to claim 7, wherein the step of uniformly mixing the calcium silicate material, the inorganic dispersant, the polycarboxylic acid superplasticizer, the polymer emulsion, the long-chain alkyl alkoxysilane and the water specifically comprises:
uniformly mixing a calcium silicate material and an inorganic dispersing agent to obtain a first mixture;
uniformly mixing a polycarboxylic acid high-efficiency water reducing agent and water to obtain a second mixture;
uniformly mixing the first mixture and the second mixture to obtain a third mixture;
adding polymer emulsion into the third mixture in batches and uniformly mixing to obtain a fourth mixture;
and adding long-chain alkyl alkoxy silane into the fourth mixture, and uniformly mixing to obtain the inorganic coating based on calcium silicate.
9. The method of claim 7, wherein the coating is one of spray coating, dip coating, or knife coating.
10. The method for preparing an inorganic coating based on calcium silicate according to claim 7, wherein the carbonization curing conditions are: the carbonization temperature is 0-50 ℃, the relative humidity is 10-70%, the volume concentration of carbon dioxide is 60-99.8%, the relative partial pressure is 0-0.3 MPa, and the curing time is more than or equal to 12h.
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| CN112624688A (en) * | 2020-12-16 | 2021-04-09 | 华南理工大学 | Low-wetting and high-durability composite portland cement and preparation method thereof |
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