CN103691652A - Steel structure fireproofing method - Google Patents
Steel structure fireproofing method Download PDFInfo
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- CN103691652A CN103691652A CN201310645535.XA CN201310645535A CN103691652A CN 103691652 A CN103691652 A CN 103691652A CN 201310645535 A CN201310645535 A CN 201310645535A CN 103691652 A CN103691652 A CN 103691652A
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Abstract
The invention discloses a steel structure fireproofing method which comprises the steps of cleaning and derusting the surface of a steel structure, coating priming paint, polishing, coating painting, site clearing and the like, through inspection, the coating on the outer surface of the steel structure is 15 to 40 mm, the actual fire endurance can reach 8 to 12 hours, thermocycling experiments show that the coating can have a complete appearance within 10 years, and is prevented from breakage and crushing, the entire steel structure has no corrosion phenomena outside, the method is reasonable in process, the cost is low, the effect is good, after the using of the method, a protecting layer can be formed on the surface of the steel structure, the outdoor fire endurance and rust resistance time of the steel structure can be improved greatly, and the steel structure and personal safety can be ensured.
Description
Technical field
The invention belongs to steel construction technical field, be specifically related to a kind of steel structure fire-fighting method.
Background technology
Along with China's economic situation is become better and better; steel construction is applied very extensive at building, bridge, shipbuilding industry; anticorrosion of steel structure fireproofing technique plays a part very important for security performance and the durability of steel construction; fireproofing technique with regard to steel construction; the general fireproof paint that adopts is in advance with protection; but the requirement that some workmen does not reach fire department appointment to the fireproof paint adopting and material, and there is no multiple tracks spraying on request or brush down to the fireproof paint thickness requirement that does not reach Steel Structural Design during construction.
Summary of the invention
For addressing the above problem, the invention discloses a kind of steel structure fire-fighting method, can significantly improve steel structure fireproofing performance, guarantee steel construction intensity, the protection person and device security.
For achieving the above object, technical scheme of the present invention is as follows:
Steel structure fire-fighting method, comprises the following steps:
(1) steel construction top layer cleaning, rust cleaning
The present invention eliminates rust and adopts manual machinery rust cleaning, the rusty stain of steel structure surface, oxide skin, residual molding sand, welding slag, dust and oil, water and other dirts of iron rust molding adopt the instruments such as abrasive machine, wire brush, emery cloth to eliminate rust, surface cleanness, roughness reach hand cleaning St3 standard, soluble surface salt content reaches standard, is up to the standards and can constructs;
(2) primer painting
Steel structure surface brush chlorosulfonated polyethylene 1-3 road after having eliminated rust;
(3) polishing
The lacquer painting of polishing after surface drying, by surface rubbing, checks thickness with calibrator with 100 or 150 object sand paper, measures 20-40 point, and after milled, priming paint gross thickness is not less than 300 um;
(4) coating applies
A: by water: 120-130 part, dried powder boundary agent: 50-60 part, titanium dioxide: 40-50 part is prepared raw material in proportion;
B: method for making: prepare in proportion material, first water is poured in container, add solid interface agent to stir 5-8 minute, add titanium dioxide to stir 5-10 minute;
C: 1 the steel construction skin of spray painting preparing with step a, coating thickness 3-8mm;
D: formulation for coating material: water: 145-160 part, dried powder boundary agent: 40-50 part, titanium dioxide: 65-80 part;
E: prepare in proportion material, first water is poured in container, add solid interface agent to stir 3-6 minute, add powder stirring 4-10 minute;
F: the paint rolling applying steel construction 2-4 time preparing with step e, every is 6-8mm all over thickness, every all over interval time be 16-28 hour, interim masking work face, last flattens processing all over after finishing, and finally sprays 1 coating, thickness 0.5-1mm;
G: check paint thickness with calibrator, measure 20-50 point, gross thickness requires 1mm lower than regulation at most, range estimation steel structure surface flatness;
(5) site clearing
Sweep scene, remaining coating good seal, painting tool cleans up with gasoline.
In the surface cleanness described in construction technology step (1), adopt standard photographs comparison, and roughness adopts standard card comparison, solubility salt adopts Bresle method of testing, Bresle test piece is affixed on to steel surface after sandblast, by distilled water injected plastic film, water can dissolve solubility salt, then again obtains the sample of water, can assess the level of surperficial salt by measuring and analysing meter.
Layer method outside the manual cleanup steel construction described in construction technology step (1):
1, with pneumatic or electronic rotation wire brush, process floating rust, with elastic grinding wheel sheet polishing steel surface processing welding lines and the floating rust of pneumatic or electronic rotation;
2, vibrations hammering method: by hand or power tool strike steel construction, for clearing up heavy scale, root out thicker corrosion layer;
3, with 1:30-50 washing powder water, scrub steel construction skin, after wiping clean, the watery hydrochloric acid with 1:80-100 cleans the oil removing of making a return journey in 1-5 minute, water, surface impurity again;
4, with air blast, blow away dust, the rubbish of steel construction, by clean cloth, wipe clean.
At the St3 described in construction technology step (1), be a kind of grade of hand cleaning, represent craft very thoroughly and powertool cleaning; Steel surface should be without visible grease and dirt, and does not adhere to not firm oxide skin, the attachments such as iron rust and painting layer, and surface of bottom material should show metallic luster.
In spraying construction technology step (4) Suo Shu, use pressure sending type flush coater, spray pressure is 0.4-0.8Mpa, and gun slot outlet is 2-5mm.
Before the spraying described in construction technology step (4), roller coating operation, with colour bar cloth or plastic sheeting, the place beyond working face is all covered, in order to avoid coating splashes other places, roller coating interim is also used colour bar cloth or plastic sheeting masking work face, prevents that working face is infected with dust.
In the dried powder boundary agent described in construction technology step (4), by vinyl acetate-ethene, made, there is good fire resistance, corrosion resistance and superpower bonding force, be equipped with 2-5% waterglass, perlite, there is density low, thermal conductivity factor is little, fire insulation performance is good, strong adhesion, dry solidification is fast, the features such as nontoxic pollution-free, in the time of can also adding 1-2% decomposes, produce the material of non-flammable compressive gas as urea, phosphate etc., can also add 0.2-0.5% to be subject to material that heat energy produces thick froth bed as Firebrake ZB etc., utilize its thermal insulation to reach flame-out object.
The steel construction that construction is finished is tested by standard, increase and decrease coating layer thickness, and fire endurance is also different, actual fire endurance reaches more than 8-12 hour, and this coating, through thermal cycling test, can guarantee at 10 years outers complete, do not split not powder, whole steel construction is in outdoor corrosion-free phenomenon.
The invention has the beneficial effects as follows:
Steel structure fire-fighting method of the present invention, technique is reasonable, spends few, effective, uses this construction technology, can on steel construction top layer, form protective layer, significantly improves steel construction in outdoor fire endurance and corrosion resistant time, has guaranteed steel construction and personal safety.
The specific embodiment
Embodiment 1
Steel structure fire-fighting method described in the present embodiment, comprises the following steps:
(1) steel construction top layer cleaning, rust cleaning
Steel construction rust cleaning described in the present embodiment adopts the manual mechanical derusting that adds, the rusty stain of steel structure surface, oxide skin, residual molding sand, welding slag, dust and oil, water and other dirts of iron rust molding adopt the instruments such as abrasive machine, wire brush, emery cloth to eliminate rust, surface cleanness, roughness reach hand cleaning St3 standard, soluble surface salt content reaches standard, is up to the standards and can constructs;
(2) primer painting
Steel structure surface brush chlorosulfonated polyethylene 1 road after having eliminated rust;
(3) polishing
The lacquer painting of polishing after surface drying, by surface rubbing, checks thickness with calibrator with 150 object sand paper, measures 20 points, average 300 um of priming paint gross thickness after milled;
(4) coating applies
A: by water: 120 parts, dried powder boundary agent: 50 parts, titanium dioxide: prepare in proportion raw material for 40 parts;
B: method for making: prepare in proportion material, first water is poured in container, add solid interface agent to stir 5 minutes, add titanium dioxide to stir 5 minutes;
C: 1 the steel construction skin of spray painting preparing with step a, coating thickness 3mm;
D: formulation for coating material: water: 145 parts, dried powder boundary agent: 40 parts, titanium dioxide: 65 parts;
E: prepare material by formula rate described in steps d, first water is poured in container, add solid interface agent to stir 3 minutes, add powder stirring 4 minutes;
F: the paint rolling applying steel construction preparing with step e 2 times, every is 6mm all over thickness, every all over interval time be 16 hours, interim masking work face, last flattens processing all over after finishing, and finally sprays 1 coating, thickness 0.5mm;
G: with calibrator, check paint thickness, measure 20 points, more than the minimum 14mm of gross thickness, range estimation steel structure surface flatness;
(5) site clearing
Sweep scene, remaining coating good seal, painting tool cleans up with gasoline.
In the surface cleanness described in step (1), adopt standard photographs comparison, and roughness adopts standard card comparison, solubility salt adopts Bresle method of testing, Bresle test piece is affixed on to steel surface after sandblast, by distilled water injected plastic film, water can dissolve solubility salt, then again obtains the sample of water, can assess the level of surperficial salt by measuring and analysing meter.
Layer method outside the manual cleanup steel construction described in step (1):
1, with pneumatic or electronic rotation wire brush, process floating rust, with elastic grinding wheel sheet polishing steel surface processing welding lines and the floating rust of pneumatic or electronic rotation;
2, vibrations hammering method: by hand or power tool strike steel construction, for clearing up heavy scale, root out thicker corrosion layer;
3, with 1:30 washing powder water, scrub steel construction skin, after wiping clean, the watery hydrochloric acid with 1:80 cleans the oil removing of making a return journey in 1 minute, water, surface impurity again;
4, with air blast, blow away dust, the rubbish of steel construction, by clean cloth, wipe clean.
At the St3 described in step (1), be a kind of grade of hand cleaning, represent craft very thoroughly and powertool cleaning; Steel surface should be without visible grease and dirt, and does not adhere to not firm oxide skin, the attachments such as iron rust and painting layer, and surface of bottom material should show metallic luster.
In spraying step (4) Suo Shu, use pressure sending type flush coater, spray pressure is 0.4Mpa, and gun slot outlet is 2mm.
Before the spraying described in step (4), roller coating operation, with colour bar cloth or plastic sheeting, the place beyond working face is all covered, in order to avoid coating splashes other places, roller coating interim is also used colour bar cloth or plastic sheeting masking work face, prevents that working face is infected with dust.
In the dried powder boundary agent described in construction technology step (4), by vinyl acetate-ethene, made, there is good fire resistance, corrosion resistance and superpower bonding force, be equipped with 2% waterglass, have that density is low, thermal conductivity factor is little, fire insulation performance is good, the feature such as strong adhesion, dry solidification are fast, nontoxic pollution-free, in the time that 1% decomposes can also being added, produce the material urea of non-flammable compressive gas, can also add 0.2% to be subject to heat energy to produce the material Firebrake ZB of thick froth bed, utilize its thermal insulation to reach flame-out object.
Construction is tested after finishing, the present embodiment steel construction coating layer thickness 15mm, and actual fire endurance reaches more than 8 hours, can guarantee at 10 years outers completely through thermal cycling test, does not split not powder, and whole steel construction is in outdoor corrosion-free phenomenon.
Embodiment 2
Steel structure fire-fighting method, comprises the following steps:
(1) steel construction top layer cleaning, rust cleaning
Steel construction rust cleaning described in the present embodiment adopts manual machinery rust cleaning, the rusty stain of steel structure surface, oxide skin, residual molding sand, welding slag, dust and oil, water and other dirts of iron rust molding adopt the instruments such as abrasive machine, wire brush, emery cloth to eliminate rust, surface cleanness, roughness reach hand cleaning St3 standard, soluble surface salt content reaches standard, is up to the standards and can constructs;
(2) primer painting
Steel structure surface brush chlorosulfonated polyethylene 2 roads after having eliminated rust;
(3) polishing
The lacquer painting of polishing after surface drying, by surface rubbing, checks thickness with calibrator with 150 object sand paper, measures 30 points, and after milled, priming paint gross thickness is 400 um;
(4) coating applies
A: by water: 125 parts, dried powder boundary agent: 55 parts, titanium dioxide: prepare in proportion raw material for 45 parts;
B: method for making: prepare in proportion material, first water is poured in container, add solid interface agent to stir 6 minutes, add titanium dioxide to stir 8 minutes;
C: 1 the steel construction skin of spray painting preparing with step a, coating thickness 6mm;
D: formulation for coating material: water: 150 parts, dried powder boundary agent: 45 parts, titanium dioxide: 70 parts;
E: prepare material by formula rate described in steps d, first water is poured in container, add solid interface agent to stir 5 minutes, add powder stirring 8 minutes;
F: the paint rolling applying steel construction preparing with step e 3 times, every is 7mm all over thickness, every all over interval time be 24 hours, interim masking work face, last flattens processing all over after finishing, and finally sprays 1 coating, thickness 0.6mm;
G: check paint thickness with calibrator, measure 40 points, the minimum 27mm of gross thickness, range estimation steel structure surface flatness;
(5) site clearing
Sweep scene, remaining coating good seal, painting tool cleans up with gasoline.
In the surface cleanness described in step (1), adopt standard photographs comparison, and roughness adopts standard card comparison, solubility salt adopts Bresle method of testing, Bresle test piece is affixed on to steel surface after sandblast, by distilled water injected plastic film, water can dissolve solubility salt, then again obtains the sample of water, can assess the level of surperficial salt by measuring and analysing meter.
Layer method outside the manual cleanup steel construction described in step (1):
1, with pneumatic or electronic rotation wire brush, process floating rust, with elastic grinding wheel sheet polishing steel surface processing welding lines and the floating rust of pneumatic or electronic rotation;
2, vibrations hammering method: by hand or power tool strike steel construction, for clearing up heavy scale, root out thicker corrosion layer;
3, with 1:40 washing powder water, scrub steel construction skin, after wiping clean, the watery hydrochloric acid with 1:90 cleans the oil removing of making a return journey in 3 minutes, water, surface impurity again;
4, with air blast, blow away dust, the rubbish of steel construction, by clean cloth, wipe clean.
At the St3 described in step (1), be a kind of grade of hand cleaning, represent craft very thoroughly and powertool cleaning; Steel surface should be without visible grease and dirt, and does not adhere to not firm oxide skin, the attachments such as iron rust and painting layer, and surface of bottom material should show metallic luster.
In spraying step (4) Suo Shu, use pressure sending type flush coater, spray pressure is 0.6Mpa, and gun slot outlet is 4mm.
Before the spraying described in step (4), roller coating operation, with colour bar cloth or plastic sheeting, the place beyond working face is all covered, in order to avoid coating splashes other places, roller coating interim is also used colour bar cloth or plastic sheeting masking work face, prevents that working face is infected with dust.
In the dried powder boundary agent described in step (4), by vinyl acetate-ethene, made, there is good fire resistance, corrosion resistance and superpower bonding force, be equipped with 4% perlite, have that density is low, thermal conductivity factor is little, fire insulation performance is good, the feature such as strong adhesion, dry solidification are fast, nontoxic pollution-free, in the time that 1.5% decomposes can also being added, produce the material of non-flammable compressive gas as phosphate, can also add 0.4% to be subject to heat energy to produce the material Firebrake ZB of thick froth bed, utilize its thermal insulation to reach flame-out object.
Construction is tested after finishing, the present embodiment steel construction coating layer thickness 27mm, and actual fire endurance reaches 10 hours, can guarantee at 10 years outers completely through thermal cycling test, does not split not powder, and whole steel construction is in outdoor corrosion-free phenomenon.
Embodiment 3
Steel structure fire-fighting method, comprises the following steps:
(1) steel construction top layer cleaning, rust cleaning
Steel construction rust cleaning described in the present embodiment adopts manual machinery rust cleaning, the rusty stain of steel structure surface, oxide skin, residual molding sand, welding slag, dust and oil, water and other dirts of iron rust molding adopt the instruments such as abrasive machine, wire brush, emery cloth to eliminate rust, surface cleanness, roughness reach hand cleaning St3 standard, soluble surface salt content reaches standard, is up to the standards and can constructs;
(2) primer painting
Steel structure surface brush chlorosulfonated polyethylene 3 roads after having eliminated rust;
(3) polishing
The lacquer painting of polishing after surface drying, by surface rubbing, checks thickness with calibrator with 100 object sand paper, measures 40 points, and after milled, priming paint gross thickness is not less than 600um;
(4) coating applies
A: by water: 130 parts, dried powder boundary agent: 60 parts, titanium dioxide: prepare in proportion raw material for 50 parts;
B: method for making: prepare in proportion material, first water is poured in container, add solid interface agent to stir 8 minutes, add titanium dioxide to stir 10 minutes;
C: 1 the steel construction skin of spray painting preparing with step a, coating thickness 8mm;
D: formulation for coating material: water: 160 parts, dried powder boundary agent: 50 parts, titanium dioxide: 80 parts;
E: prepare material by formula rate described in steps d, first water is poured in container, add solid interface agent to stir 6 minutes, add powder stirring 10 minutes;
F: the paint rolling applying steel construction preparing with step e 4 times, every is 8mm all over thickness, every all over interval time be 28 hours, interim masking work face, last flattens processing all over after finishing, and finally sprays 1 coating, thickness 1mm;
G: check paint thickness with calibrator, measure 50 points, the average minimum 40mm of gross thickness, range estimation steel structure surface flatness;
(5) site clearing
Sweep scene, remaining coating good seal, painting tool cleans up with gasoline.
In the surface cleanness described in step (1), adopt standard photographs comparison, and roughness adopts standard card comparison, solubility salt adopts Bresle method of testing, Bresle test piece is affixed on to steel surface after sandblast, by distilled water injected plastic film, water can dissolve solubility salt, then again obtains the sample of water, can assess the level of surperficial salt by measuring and analysing meter.
Layer method outside the manual cleanup steel construction described in step (1):
1, with pneumatic or electronic rotation wire brush, process floating rust, with elastic grinding wheel sheet polishing steel surface processing welding lines and the floating rust of pneumatic or electronic rotation;
2, vibrations hammering method: by hand or power tool strike steel construction, for clearing up heavy scale, root out thicker corrosion layer;
3, with 1:30-50 washing powder water, scrub steel construction skin, after wiping clean, the watery hydrochloric acid with 1:80-100 cleans the oil removing of making a return journey in 1-5 minute, water, surface impurity again;
4, with air blast, blow away dust, the rubbish of steel construction, by clean cloth, wipe clean.
At the St3 described in step (1), be a kind of grade of hand cleaning, represent craft very thoroughly and powertool cleaning; Steel surface should be without visible grease and dirt, and does not adhere to not firm oxide skin, the attachments such as iron rust and painting layer, and surface of bottom material should show metallic luster.
In spraying step (4) Suo Shu, use pressure sending type flush coater, spray pressure is 0.8Mpa, and gun slot outlet is 5mm.
Before the spraying described in step (4), roller coating operation, with colour bar cloth or plastic sheeting, the place beyond working face is all covered, in order to avoid coating splashes other places, roller coating interim is also used colour bar cloth or plastic sheeting masking work face, prevents that working face is infected with dust.
In the dried powder boundary agent described in step (4), by vinyl acetate-ethene, made, there is good fire resistance, corrosion resistance and superpower bonding force, be equipped with 5% perlite, have that density is low, thermal conductivity factor is little, fire insulation performance is good, the feature such as strong adhesion, dry solidification are fast, nontoxic pollution-free, in the time that 2% decomposes can also being added, produce the material urea of non-flammable compressive gas, can also add 0.5% to be subject to heat energy to produce the material Firebrake ZB of thick froth bed, utilize its thermal insulation to reach flame-out object.
Construction is tested after finishing, the present embodiment steel construction coating layer thickness 40mm, and actual fire endurance reaches 12 hours, can guarantee at 10 years outers completely through thermal cycling test, does not split not powder, and whole steel construction is in outdoor corrosion-free phenomenon.
Technological means disclosed in this invention is not limited only to the disclosed technological means of above-mentioned embodiment, also comprises the technical scheme being comprised of above technical characterictic.
Claims (10)
1. steel structure fire-fighting method, is characterized in that: comprise the following steps:
(1) steel construction top layer cleaning, rust cleaning
Adopt the manual mechanical derusting that adds, the rusty stain of steel structure surface, oxide skin, residual molding sand, welding slag, dust and oil, water and other dirts of iron rust molding adopt the instruments such as abrasive machine, wire brush, emery cloth to eliminate rust, surface cleanness, roughness reach hand cleaning St3 standard, soluble surface salt content reaches standard, is up to the standards and can constructs;
(2) primer painting
Steel structure surface brush chlorosulfonated polyethylene 1-3 road after having eliminated rust;
(3) polishing
The lacquer painting of polishing after surface drying, by surface rubbing, checks thickness with calibrator with 100 or 150 object sand paper, measures 20-40 point, and after milled, priming paint gross thickness reaches requirement;
(4) coating applies
A: by water: 120-130 part, dried powder boundary agent: 50-60 part, titanium dioxide: 40-50 part is prepared raw material in proportion;
B: method for making: prepare in proportion material, first water is poured in container, add solid interface agent to stir 5-8 minute, add titanium dioxide to stir 5-10 minute;
C: 1 the steel construction skin of spray painting preparing with step a, coating thickness 3-8mm;
D: formulation for coating material: water: 145-160 part, dried powder boundary agent: 40-50 part, titanium dioxide: 65-80 part;
E: prepare in proportion material, first water is poured in container, add solid interface agent to stir 3-6 minute, add powder stirring 4-10 minute;
F: the paint rolling applying steel construction 2-4 time preparing with step e, every is 6-8mm all over thickness, every all over interval time be 16-28 hour, interim masking work face, last flattens processing all over after finishing, and finally sprays 1 coating, thickness 0.5-1mm;
G: check paint thickness with calibrator, measure 20-50 point, gross thickness requires 1mm lower than regulation at most, range estimation steel structure surface flatness;
(5) site clearing
Sweep scene, remaining coating good seal, painting tool cleans up with gasoline.
2. steel structure fire-fighting method according to claim 1, is characterized in that: in the surface cleanness described in step (1), adopt standard photographs comparison, roughness adopts standard card comparison.
3. steel structure fire-fighting method according to claim 1,, it is characterized in that: outside the manual cleanup steel construction described in step (1), layer method is:
(1), with pneumatic or electronic rotation wire brush, process floating rust.
4. by the elastic grinding wheel sheet polishing steel surface processing welding lines of pneumatic or electronic rotation, become rusty with floating;
(2), vibrations hammering method: by hand or power tool strike steel construction, for clearing up heavy scale, root out thicker corrosion layer;
(3), with 1:30-50 washing powder water, scrub steel construction skin, after wiping clean, the watery hydrochloric acid with 1:80-100 cleans the oil removing of making a return journey in 1-5 minute, water, surface impurity again;
(4), with air blast, blow away dust, the rubbish of steel construction, by clean cloth, wipe clean.
5. steel structure fire-fighting method according to claim 1, is characterized in that: after described step (3) milled, priming paint gross thickness is not less than 300 um.
6. steel structure fire-fighting method according to claim 1, it is characterized in that: before the spraying described in step (4), roller coating operation, with colour bar cloth or plastic sheeting, working face place in addition is all covered, roller coating interim is also used colour bar cloth or plastic sheeting masking work face.
7. steel structure fire-fighting method according to claim 1, is characterized in that: in the dried powder boundary agent described in step (4), by vinyl acetate-ethene, made.
8. steel structure fire-fighting method according to claim 6, is characterized in that: in the dried powder boundary agent described in step (4), add 2-5% waterglass, perlite.
9. steel structure fire-fighting method according to claim 6, is characterized in that: in described dried powder boundary agent, add 1-2% urea or phosphate.
10. according to the steel structure fire-fighting method described in claim 6,7,8 any one, it is characterized in that: in described dried powder boundary agent, add 0.2-0.5% Firebrake ZB.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105693153A (en) * | 2016-01-27 | 2016-06-22 | 同济大学 | Graphene oxide modified fireproof antiseptic dual-functional coating and method for non-expanding steel structure |
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| CN103396710A (en) * | 2013-08-06 | 2013-11-20 | 信和新材料股份有限公司 | Aqueous fireproof coating formula of indoor ultrathin steel structures and preparation technology thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103396710A (en) * | 2013-08-06 | 2013-11-20 | 信和新材料股份有限公司 | Aqueous fireproof coating formula of indoor ultrathin steel structures and preparation technology thereof |
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| 张相悦: "防火材料在钢结构上的应用", 《浙江建筑》 * |
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| CN105693153A (en) * | 2016-01-27 | 2016-06-22 | 同济大学 | Graphene oxide modified fireproof antiseptic dual-functional coating and method for non-expanding steel structure |
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Application publication date: 20140402 |