CN114891381A - Magnesium phosphate cement-based steel structure anticorrosion fireproof coating - Google Patents
Magnesium phosphate cement-based steel structure anticorrosion fireproof coating Download PDFInfo
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- CN114891381A CN114891381A CN202210694443.XA CN202210694443A CN114891381A CN 114891381 A CN114891381 A CN 114891381A CN 202210694443 A CN202210694443 A CN 202210694443A CN 114891381 A CN114891381 A CN 114891381A
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- Prior art keywords
- fireproof coating
- steel structure
- anticorrosive
- magnesium phosphate
- coating
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- 238000000576 coating method Methods 0.000 title claims abstract description 71
- 239000011248 coating agent Substances 0.000 title claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 239000004137 magnesium phosphate Substances 0.000 title claims abstract description 28
- 229960002261 magnesium phosphate Drugs 0.000 title claims abstract description 28
- 229910000157 magnesium phosphate Inorganic materials 0.000 title claims abstract description 28
- 235000010994 magnesium phosphates Nutrition 0.000 title claims abstract description 28
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 title claims abstract description 27
- 239000004568 cement Substances 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 19
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 15
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 15
- 239000003063 flame retardant Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 10
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 10
- 229910000077 silane Inorganic materials 0.000 claims abstract description 10
- 229910021538 borax Inorganic materials 0.000 claims abstract description 9
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 9
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 9
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004113 Sepiolite Substances 0.000 claims abstract description 8
- 239000011324 bead Substances 0.000 claims abstract description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010451 perlite Substances 0.000 claims abstract description 8
- 235000019362 perlite Nutrition 0.000 claims abstract description 8
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 8
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 8
- 239000010455 vermiculite Substances 0.000 claims abstract description 8
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 8
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 8
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 7
- 239000004816 latex Substances 0.000 claims abstract description 7
- 229920000126 latex Polymers 0.000 claims abstract description 7
- 239000010452 phosphate Substances 0.000 claims abstract description 7
- 229920000388 Polyphosphate Polymers 0.000 claims abstract description 5
- 239000001205 polyphosphate Substances 0.000 claims abstract description 5
- 235000011176 polyphosphates Nutrition 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910001868 water Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 17
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 uniformly stirring Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-M dihydrogenphosphate Chemical compound OP(O)([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-M 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012933 kinetic analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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 anticorrosive fireproof coating for a magnesium phosphate cement-based steel structure, which is formed by using dead burned magnesium oxide, dihydric phosphate, zinc phosphate, polyphosphate, redispersible latex powder, silane-based powder, polyvinyl alcohol, borax and zinc borate as anticorrosive bonding components, and expanded vermiculite, expanded perlite, hollow floating bead and sepiolite as flame-retardant and heat-insulating components. The anticorrosive fireproof coating provided by the invention not only meets the requirements of related technical indexes, but also has the characteristics of good cohesiveness, strong corrosion resistance, good corrosion resistance, environmental protection and no pollution.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a magnesium phosphate cement-based steel structure anticorrosion fireproof coating.
Background
At present, the thick fireproof coating for the steel structure basically adopts silicate cement and refractory cement as main cementing materials, in order to improve the fireproof performance of the thick fireproof coating, foaming materials such as melamine and the like are also added into the thick fireproof coating, and the foaming materials can generate ammonia gas in the reaction process to cause environmental pollution. Meanwhile, the current thick steel structure fireproof coating also has the defects of easy falling, long drying time, complex construction process and the like. In addition, the problem of bearing capacity reduction caused by fire hazards of the steel structure is solved, and the problem of bearing capacity reduction caused by corrosion is solved, so that two problems of corrosion prevention and fire prevention need to be solved simultaneously to guarantee the safety application of the steel structure. In practical engineering application, usually, an anti-corrosive primer is coated on the surface of a substrate, and then a fireproof coating is coated, but the defects of multiple construction procedures, high manufacturing cost and the like exist, and if the anti-corrosive coating is not matched with the fireproof coating, the coating falls off and loses the protection effect. Therefore, at present, a steel structure thick coating which can be quickly coated on the surface of a steel structure, is environment-friendly, pollution-free, high in bonding strength, fireproof and anticorrosive and convenient to construct is urgently needed.
Disclosure of Invention
Aiming at the problems of poor fire resistance, easy corrosion and the like of the existing steel structure, the invention provides the magnesium phosphate cement-based steel structure anticorrosion fireproof coating which is environment-friendly, pollution-free, short in drying time, strong in bonding property and fireproof and anticorrosion.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anticorrosion fireproof coating for a magnesium phosphate cement-based steel structure is composed of a flame-retardant heat-insulation component, a flame-retardant binder component, and a flame-retardant binder component, wherein the flame-retardant binder component is composed of dead burned magnesium oxide, dihydric phosphate, zinc phosphate, polyphosphate, redispersible latex powder, silane-based powder, polyvinyl alcohol, borax and zinc borate; the composite material comprises, by weight, 22-25% of dead burned magnesium oxide, 5-10% of dihydric phosphate, 0-2.5% of zinc phosphate, 0-2% of polyphosphate, 1.5-2.5% of redispersible latex powder, 0.4-1.2% of silyl powder, 1.5-2% of polyvinyl alcohol, 0.8-1.5% of borax, 2-6% of zinc borate, 21-25% of expanded vermiculite, 12-16% of expanded perlite, 5-10% of hollow floating beads and 10-12% of sepiolite, wherein the sum of the weight percentages of the components is 100%.
Furthermore, the active content of the silane-based powder is 20 +/-0.5%, and the particle size is 150-200 microns. The particle size of the expanded vermiculite is 0.5-1.5 mm, and the density is 500-600 kg/m 3 The thermal conductivity is 0.04-0.06W/(mK). The particle size of the expanded perlite is 2.5-3.5 mm, and the density is 80-100 kg/m 3 The thermal conductivity is 0.003-0.005W/(mK). The particle diameter of the hollow floating bead is 75-150 mu m, and the density is 300-400 kg/m 3 The thermal conductivity is 0.03-0.05W/(mK). The sepiolite has a hardness of 2-3 and a density of 600-700 kg/m 3 。
The application method of the magnesium phosphate cement-based steel structure anticorrosion fireproof coating comprises the steps of cleaning the surface of a steel structure, adding water into the anticorrosion fireproof coating, uniformly stirring, coating the anticorrosion fireproof coating on the surface of the cleaned steel structure, and allowing the anticorrosion fireproof coating to be quickly condensed; wherein, the water addition amount is 70 to 80 percent of the weight of the used anticorrosive fireproof coating; the thickness of the coated coating is more than or equal to 8 mm.
The expanded vermiculite, the expanded perlite, the hollow floating bead and the sepiolite used in the invention are all environment-friendly refractory materials, can absorb heat expansion at high temperature without generating toxic gas, have excellent fireproof performance, and are beneficial to uniform and compact coating by reasonably grading the four materials. However, the use of expanded vermiculite, expanded perlite, hollow floating beads and sepiolite has a negative effect on the bonding strength of the coating. With the increase of the mixing amount, the proportion of the binding material in unit volume is reduced, and the binding strength is gradually reduced. Therefore, the invention uses the dead burned magnesia, phosphate, borax, water, re-dispersible emulsion powder, polyvinyl alcohol, silane-based powder and zinc borate as a composite binding material, so that the fireproof coating has excellent binding strength under the condition that the fireproof material is contained in the maximum proportion.
In the used composite binding material, the magnesium phosphate cement formed by dead burned magnesium oxide and phosphate also has the advantages of quick hardening, early strength and strong thermal stability. The combination of the components with different expansion coefficients of the coating at high temperatureThe joint is easy to crack, and the use of the redispersible latex powder and the polyvinyl alcohol can form a polymer film on the surface of the framework, improve the toughness and enable the framework to have the deformability. The silane-based powder contributes to the improvement of weather resistance and water resistance of the coating in various natural environments. Borax has a retarding effect, and a B-O bond in an acid radical of borax can react with-OH in PVA to form a complex, so that the polymerizability of PVA is enhanced, and the strength and the water resistance of the polymer barrier are improved. In addition, the magnesium phosphate cement, the redispersible latex powder, the polyvinyl alcohol, the borax and the like are used together to form a strong physical barrier, so that a corrosive medium can be isolated from contacting with steel, the transmission of ions and charges in a corrosion system can be hindered, the corrosion development speed is delayed, and the chemical corrosion prevention effect is achieved. And tetrahydroxyborate ion of zinc borate [ B (OH) ] 4 - ]Has antibacterial and antiseptic effects, and can be decomposed at high temperature to produce B 2 O 3 The product adsorbs the surface of a steel plate base material to form a passivation oxide layer, which can inhibit the generation of combustible gas and prevent oxidation reaction and thermal decomposition, namely has the dual functions of corrosion resistance and flame retardance. The polyphosphate can form a compact phosphate crystal phase with certain bonding performance to the bonding surface through solid-phase reaction at high temperature, generates chemical bonding and has certain anticorrosion effect.
Meanwhile, zinc phosphate is insoluble in water and cannot adhere to the surface of steel independently. The invention takes the magnesium phosphate cement-based material as the component of the anti-corrosion binding component, and utilizes the acid environment of the hydration process of the magnesium phosphate cement-based material to dissolve the zinc phosphate, thereby forming the phosphorization on the surface of the steel, and further playing the effects of isolating the steel plate from the corrosion medium and preventing the steel from being corroded. And the zinc phosphate can also react with carboxyl in the coating and certain ions in a corrosion medium to generate a complex capable of reacting with a corrosion product, so that a dense protection barrier is further formed on the surface of the steel, and the corrosion rate of the base material is delayed. Phosphate ions released by hydration products of the magnesium phosphate cement-based materials also participate in a phosphate precipitation mechanism, so that the corrosion rate of steel in the solution can be reduced. In addition, the microbattery reaction of zinc phosphate also helps to consume KH in the hydration process of magnesium phosphate 2 PO 4 Large amount of H generated by ionization + (kinetic analysis of Zinc phosphate film Forming Process: anodic reaction: Zn-2e → Zn) 2+ And (3) cathode reaction: 2H + +2e→H 2 ) The adverse effects of the hydrogen evolution phenomenon on the bonding strength, corrosion resistance and fire resistance are reduced, and the comprehensive performance of the coating is effectively improved.
In a word, the magnesium phosphate cement-based steel structure anticorrosion fireproof coating can meet various requirements of steel structure fireproof coatings (GB 14907-2002) (shown in Table 1) by improving the pore condition in the coating, increasing the resistance of electron and charge transmission and the like under the combined action in various aspects.
TABLE 1
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The magnesium phosphate cement-based steel structure anticorrosion fireproof paint comprises, by weight, 24.82% of dead burned magnesium oxide, 8.27% of monopotassium phosphate, 2% of zinc phosphate, 2.30% of redispersible latex powder, 1.18% of silane-based powder, 1.96% of polyvinyl alcohol, 1.38% of borax, 2.94% of zinc borate, 22.06% of expanded vermiculite, 14.71% of expanded perlite, 7.35% of hollow floating bead and 11.03% of sepiolite, and is uniformly mixed.
The use method of the magnesium phosphate cement-based steel structure anticorrosion fireproof coating specifically comprises the following steps:
1) surface treatment of a steel base material: cleaning floating dust, broken slag, oil dirt, rust and the like on the surface of the steel base material;
2) blending of the anticorrosive fireproof coating: mixing the components according to the formula, adding water accounting for 75 percent of the weight of the anticorrosive fireproof coating, and uniformly stirring;
3) construction of the anticorrosive fireproof coating: the prepared coating is sprayed by a spray gun or a brush, and the thickness of the coating is 25 mm.
4) And (3) coagulation: the paint after spraying is quickly condensed on the surface of the steel.
The obtained coating has a bonding strength of 0.385MPa, a fire resistance limit of 140min, an open-circuit potential of-382 mV, and a dry density of 555 kg/m 3 And the compressive strength is 1.17 MPa.
Examples 2 to 4
The amounts of dead burned magnesium oxide and potassium dihydrogen phosphate constituting magnesium phosphate cement in the formulation of the anticorrosive fire-retardant coating of the examples were adjusted as shown in Table 2, and the same process as in example 1 was used to construct the coating, and the properties of the coating were examined, and the results are shown in Table 2.
TABLE 2
As can be seen from Table 2, when the amount of the magnesium phosphate cement is increased from 30% to 35%, the bonding strength of the coating material is increased by 6.7%, and from 35% to 40%, the bonding strength of the coating material is increased by 0.5%, and the increase tends to be stable. And the open-circuit potential is gradually increased along with the increase of the mixing amount of the magnesium phosphate cement, which shows that the steel corrosion resistance of the coating is gradually enhanced.
Examples 5 to 7
The ratio (P/M) of dihydrogen phosphate/dead burned magnesium oxide in the formulation of the anticorrosive fire-retardant coating of the examples was adjusted as shown in Table 3, and the same process as in example 1 was used to conduct the construction, and the properties of the resulting coating were examined, the results of which are shown in Table 3.
TABLE 3
As can be seen from Table 3, when P/M is 1/3, the open circuit potential of magnesium phosphate is the greatest, and the corrosion resistance of steel is the strongest; meanwhile, the coating has the highest bonding strength and the strongest interface bonding effect.
Examples 8 to 11
The blending amount of zinc borate in the formulation of the anticorrosive fireproof paint of the example was adjusted according to table 4, the construction was performed by the same process as in example 1, and the properties of the obtained coating were examined, and the results are shown in table 4.
TABLE 4
As can be seen from Table 4, the increase of the amount of zinc borate is beneficial to the fire resistance in a certain range, but too much zinc borate may hinder the hydration reaction, resulting in the decrease of the adhesive property.
Examples 12 to 15
The amount of the silane-based powder in the formulation of the anticorrosive fire-retardant coating in the examples was adjusted according to Table 5, the same process as in example 1 was used for construction, and the properties of the obtained coating were examined, the results are shown in Table 5.
TABLE 5
As can be seen from table 5, increasing the amount of silane-based powder added increases the compactness of the coating and increases its fire resistance, but decreases the cohesive strength of the coating.
Examples 16 to 18
The doping amount of zinc phosphate in the formula of the anticorrosive fireproof paint in the embodiment is adjusted according to the table 6, the construction is carried out by adopting the same process as the embodiment 1, the performance of the obtained coating is inspected, and the result is shown in the table 6.
TABLE 6
As can be seen from Table 6, the fire resistance of the coating is gradually reduced with the increase of the zinc phosphate, but the influence on the bonding strength and the compressive strength is obvious, and the open-circuit potential can be seen, the corrosion resistance of the coating is obviously improved by the addition of the zinc phosphate, but when the addition of the zinc phosphate is increased from 5% to 7.5%, the increase range of the open-circuit potential of the coating is reduced, the protection effect on the corrosion of steel is gradually stabilized, and therefore, the addition of the zinc phosphate is not more than 2.5%.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. The utility model provides a magnesium phosphate cement-based steel structure anticorrosion type fire retardant coating which characterized in that: the anticorrosive fireproof coating comprises an anticorrosive bonding component and a flame-retardant heat-insulating component, wherein 22-25% of dead burned magnesium oxide, 5-10% of dihydric phosphate, 0-2.5% of zinc phosphate, 0-2% of polyphosphate, 1.5-2.5% of redispersible latex powder, 0.4-1.2% of silane-based powder, 1.5-2% of polyvinyl alcohol, 0.8-1.5% of borax and 2-6% of zinc borate are used as the anticorrosive bonding component, 21-25% of expanded vermiculite, 12-16% of expanded perlite, 5-10% of hollow floating beads and 10-12% of sepiolite are used as the flame-retardant heat-insulating component, and the sum of the weight percentages of the components is 100%.
2. The magnesium phosphate cement-based steel structure anticorrosion fireproof coating according to claim 1, characterized in that: the active content of the silane-based powder is 20 +/-0.5%, and the particle size is 150-200 mu m.
3. The magnesium phosphate cement-based steel structure anticorrosion fireproof coating according to claim 1, characterized in that: the particle size of the expanded vermiculite is 0.5-1.5 mm, and the density is 500-600 kg/m 3 The thermal conductivity is 0.04-0.06W/(mK).
4. The magnesium phosphate cement-based steel structure anticorrosion fireproof coating according to claim 1, characterized in that: the particle size of the expanded perlite is 2.5-3.5 mm, and the density is 80-100 kg/m 3 The thermal conductivity is 0.003-0.005W/(mK).
5. The magnesium phosphate cement-based steel structure anticorrosion fireproof coating according to claim 1, characterized in that: the hollow floating bead has a particle size of 75-150 μm and a density of 300-400 kg/m 3 The thermal conductivity is 0.03-0.05W/(mK).
6. Magnesium phosphate according to claim 1The cement-based steel structure anticorrosion fireproof coating is characterized in that: the sepiolite has a hardness of 2-3 and a density of 600-700 kg/m 3 。
7. The magnesium phosphate cement-based steel structure anticorrosion fireproof coating according to claim 1, characterized in that: when in use, the surface of the steel structure is cleaned, then the anticorrosive fireproof coating is added with water and stirred uniformly, and then the anticorrosive fireproof coating is coated on the surface of the cleaned steel structure until the anticorrosive fireproof coating is quickly condensed;
wherein, the water addition amount is 70 to 80 percent of the weight of the used anticorrosive fireproof coating; the thickness of the coated coating is more than or equal to 8 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115975422A (en) * | 2022-10-20 | 2023-04-18 | 中建八局第三建设有限公司 | Anticorrosion and fireproof integrated coating and application thereof |
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Non-Patent Citations (1)
| Title |
|---|
| 邵晓燕: ""磷酸钾镁水泥基钢结构防火涂料的制备研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115975422A (en) * | 2022-10-20 | 2023-04-18 | 中建八局第三建设有限公司 | Anticorrosion and fireproof integrated coating and application thereof |
| CN115975422B (en) * | 2022-10-20 | 2023-09-29 | 中建八局第三建设有限公司 | Corrosion-resistant fireproof integrated coating and application thereof |
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