CN103982121A - Manufacture method of fireproof door - Google Patents
Manufacture method of fireproof door Download PDFInfo
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- CN103982121A CN103982121A CN201410229446.1A CN201410229446A CN103982121A CN 103982121 A CN103982121 A CN 103982121A CN 201410229446 A CN201410229446 A CN 201410229446A CN 103982121 A CN103982121 A CN 103982121A
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Abstract
The invention discloses a manufacture method of a fireproof door. The manufacture method of the fireproof door includes the following steps: (1) coating the interior of a die of a door with cementing material (A) used as a surface layer of the door; (2) coating a bottom surface layer formed in the step (1) with ping-pong-table-shaped cementing material (B) used as a skeleton of the door; (3) pouring cementing material (C) in a female die after the step (2); (4) covering the female die with the flat die in the step (1), closing the dies by using 2-4 tons of pressure, and splitting the dies after solidification so as to obtain the fireproof door. The manufacture method of the fireproof door has the advantages that improvement of fire prevention and heat shielding properties is improved in the step of raw material ingredient selection, and due to affinity and seamless connections of the three types of the cementing material, the problem that a heat bridge phenomenon occurs when an existing door is manufactured is solved.
Description
Technical field
The invention belongs to the technical field of building field, specifically a kind of preparation method of labeled door.
Background technology
At present, known labeled door classification has fire-proof wooden door, fire resistance steel door, steel wood labeled door etc.From the industrial analysis of existing production labeled door, the main raw material(s) that forms labeled door is steel and wooden, the fusing point of steel is high, pyroconductivity is high, wood is combustibles, thereby the main raw material(s) of current labeled door does not possess fire prevention and heat-insulating capability fundamentally, will allow so it have fire prevention, heat insulating function, just must carry out critical process processing heat insulation, anti-flammability to it.The way of fire resistance steel door is: make doorframe, door leaf skeleton and door skin with steel material, critical process is that an in-core is filled the nontoxic fire-proof heat-insulating material of human body.The way of fire-proof wooden door is: first inflammable timber is become to difficult firebrand material or difficult firebrand material products by the critical process that soaks fire retardant, then do doorframe, door leaf skeleton, door skin with it, critical process also will be filled the nontoxic fire-proof heat-insulating material of human body at door in-core.Thereby there is at present the door of certain refractory heat-insulating performance; itself is fire-proof and thermal-insulation not; relying on additional stuffed heat insulated, fire proofing critical process completely completes; the heat bridge very easily forming in structure will have a strong impact on fire-proof and thermal-insulation ability; cause labeled door aspect the production performance guarantee of industrialization, scale, produce huge hidden danger.
Summary of the invention
Just be difficult for reaching best fireproof effect in order to solve conventional fire door from raw material, and complexity and the unstability of making critical process, the heat bridge structure problem existing, the invention provides a kind of method of making labeled door, from the selection of raw material, just realize best fireproof effect, and production method is simple, the seamless link one-shaping technique of having avoided heat bridge to exist, this invention can not only fundamentally ensure and improve fire prevention, heat insulation performance, and can reduce production costs, be easy to realize Novel fire-proof door scale, the production of industrialization, labeled door industry is upgraded.
Realize above-mentioned purpose, the technical scheme adopting is, the preparation method of a kind of labeled door that the present invention designs, comprise the steps, (1) in the mould of door coating adhesive gel material A as the surface layer of door: mould comprises die and flat-die, in die, coating adhesive gel material A is as the bottom surface layer of door, and in flat-die, coating adhesive gel material A is as the upper layer of door;
(2) in (1), on bottom surface layer, apply the skeleton of day font cementitious material B as door;
(3) after (2) step is processed, then to encapsulating compound gel material C in die; (4) flat-die in (1) is covered on die, with the pressure matched moulds of 2～4 tons, after solidifying, form removal can obtain labeled door.The present invention adopts three kinds of Affi-Gel gel materials, takes clamping system can accomplish surface layer, skeleton seamless link, avoids the gap because of triplicity existence completely, causes occurring that heat bridge effect reduces fire prevention, the heat-insulating capability of door.The present invention adopts above-mentioned three kinds of cementitious material to make labeled door, be mainly because, existing technology is produced labeled door three kinds of situations: one, steel-made fire-retardant door: galvanized steel plain sheet is that door-plate, steel are skeleton, fill fire proofing material for door core, and three is by the bonding formation of the Waterproof gum hydraulicity.From structural analysis, because the coefficient of heat conduction of steel is very high, the fiery surface temperature that is subject to of door is the back of the body fire face that very easily passes to door so, geneogenous labeled door heat-proof quality defect, three is bonding by the Waterproof gum hydraulicity simultaneously, and gap has been bound to, and generation heat bridge affects heat-proof quality.Two, fire-proof wooden door: plank is that door-plate, flitch are a door skeleton, fill fire proofing material for a door core, and three passes through the bonding formation of the Waterproof gum hydraulicity.From structural analysis, woody body is not prevented fires, and is by soaking combustion adjuvant, make it have certain fire resistance property, we first cast aside owing to can causing wooden fire resistance property to decline in technique, well-known, combustion adjuvant is volatile, along with the increase of service life, combustion adjuvant can slowly vapor away from wood, and loses fireproof performance, three is bonding by the Waterproof gum hydraulicity simultaneously, the gap that has been bound to, and produce heat bridge, affect heat-proof quality.Three, magnesite door: same magnesite material is door-plate, door skeleton, door core integrated molding, and three is without passing through the bonding formation of the Waterproof gum hydraulicity.From structural analysis, fire prevention, the heat-proof quality of magnesite door are all no problem, but well-known, on market, do not have magnesite fire-proof door, trace it to its cause and be, the labeled door of this spline structure, there is the defect of preponderance, the about 150-200kg of Yishanmen, product poor operability, can not be widely used, and the Men Chongyue 35-45kg of our use conventionally, so the present invention adopts above-mentioned three kinds of Material claddings, all defect after comprehensive in prior art can both be solved, and one has fire resistance property and has the door-plate of anti-folding, anti-impact force; Two fire resistance properties are strong and have anti-folding, anti-impact force, a measuring body forming skeleton; Three have obtained light fire-proof, heat insulation good door core; Four do not form heat bridge in order to ensure internal construction, and three layer construction is by the mutual bonding forming of gelling of self, required seamless connecting structure.
Further, in step (1), cementitious material A comprises epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that light calcined magnesia, proportion are 1.9～2.0, and the mass ratio of each composition is 100:75～85:1～3:0.6～1:15～20.Cementitious material A adopts mentioned component, meet not so property and ZA2 level product smoke toxicity of A1 level from the selection aspect employing that is chosen in of composition, do not there is heat conduction, adopt GB/T7633-2008 inspection fire resistance, do not lose fire integrity at 1.6h, spend at 1.6h shop front average temperature rising 120, maximum temperaturerise 125 is spent, according to GB " GB/T7633-2008 ", in 1.5h, average temperature rising > 140 spends or maximum temperaturerise > 360 spends, product will be judged to be to lose fire insulation, therefore the selected cementitious material A of the present invention does not lose fire insulation, the following stated cementitious material B, C is by detecting, all meet national standard.
Further, the preparation method of cementitious material A is, the epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that are 1.9～2.0 by light calcined magnesia, proportion mix according to mass ratio 100:75～85:1～3:0.6～1:15～20, with 110 revs/min of stirrings, uniform stirring 10 minutes, can obtain cementitious material A.Adopt above-mentioned composition only to need simple mixing just can obtain cementitious material A, preparation method is simple, without Other Instruments equipment, reduces energy consumption and cost.
Cementitious material B comprises that light calcined magnesia, Baume degrees are 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder, and the mass ratio of each composition is 100:76～85:25～45:3～5:0.6～1:6～8.Cementitious material B is as skeleton, the material of selecting on the one hand can not carry out heat conduction, and adopt above-mentioned material as skeleton and surface layer seamless combination, can not produce heat bridge phenomenon, root, realize to greatest extent the function of fire-proof and thermal-insulation, and as skeleton, can play the effect of support completely, even without steel skeleton or wooden skeleton, bearing capacity is with existing the same.
Further, the preparation method of cementitious material B is is 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder by magnesia, Baume degrees, mix according to mass ratio 100:76～85:25～45:3～5:0.6～1:6～8, with 110 revs/min of stirrings, uniform stirring 10 minutes, become gelling slurry, then grid cloth is put into gelling slurry, after soaking into completely, obtain cementitious material B.Adopt the skeleton of above-mentioned material as door, only need simple mixing just can obtain, preparation is simple.
Cementitious material C comprises that light calcined magnesia, Baume degrees are 32 ° of gelatine solution, French chalk, rosin foams that B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentration are 7～9%, and the mass ratio of each composition is 100:60～75:3～5:3～5:0.6～1:8～12:15～25:8～15.The cementitious material C finally selecting fills up " day " font skeleton blank space, the one, smooth in order to ensure when the upper layer of Gai Hemen, another is that the weight capacity that further ensures door can reach with existing by the consistent weight capacity of the structures such as steelframe, have again, after adopting this kind of material to fill, after surface layer, skeleton combination, be all seamless combination, further ensured heat insulation, fireproof excellent properties.
Further, the preparation method of cementitious material C: (1) will form the composition of cementitious material C: light calcined magnesia, Baume degrees are that gelatine solution, French chalk, the rosin foam that 32 ° of B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentrations are 7～9% mixes according to mass ratio 100:60～75:3～5:3～5:0.6～1:8～12:15～25:8～15 of each composition, with 110 revs/min of stirrings, uniform stirring 10 minutes, obtains inorganic coagulation material C.Adopt above-mentioned composition, prepare cementitious material C and only need simple mixing.
The curing time of step (4) is 6-8h.Adopt cementitious material A, B, C, the performance of the fire-proof and thermal-insulation that these three kinds of materials not only improve to greatest extent in root, and selected composition each other can be affine mutually, together, be in conjunction with time the most closely selected hardening time to seamless combination.
To sum up, the invention has the beneficial effects as follows, adopt the labeled door that makes of the present invention, from raw material composition is selected, just realized the raising of fire prevention, heat-proof quality, and three kinds of material affine, seamless links mutually, the heat bridge phenomenon having produced while having solved existing making door, while not using the hard material skeletons such as steel frame again, labeled door of the present invention can have identical weight capacity, and various material preparations are simple, be easy to produce, be applicable to very much large-scale popularization.
Detailed description of the invention
Below in conjunction with specific embodiment, content of the present invention is further illustrated.Do not have under specified otherwise, method of operating is all the method that well known to a person skilled in the art adopting again.
Embodiment mono-: the preparation method of a kind of labeled door that the present invention develops, comprise the steps, (1) in the mould of door coating adhesive gel material A as the surface layer of door: mould comprises die and flat-die, in die, coating adhesive gel material A is as the bottom surface layer of door, and in flat-die, coating adhesive gel material A is as the upper layer of door; The thickness that cementitious material A applies is grasped according to actual conditions, and generally that best is 2-4mm.
(2) in (1), on bottom surface layer, apply the skeleton of day font cementitious material B as door; Height and the width of day font skeleton are also to grasp according to actual conditions, generally high 3-3.5mm preferably, and wide 3-5mm, in order to save cost, uses a little materials less.
(3) after (2) step is processed, then to encapsulating compound gel material C in die; Cementitious material C coating thickness is also to regulate according to actual conditions, generally preferably, exceeds casing play 1-2mm after filling.Main is also for the material with minimum, just can reach the object that bearing capacity is enough, fire insulation performance is good.
(4) flat-die in (1) is covered on die, with the pressure matched moulds of 2～4 tons, after solidifying, form removal can obtain labeled door.
In step (1), cementitious material A comprises epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that light calcined magnesia, proportion are 1.9～2.0, and the mass ratio of each composition is 100:75:1:0.6:15.
The preparation method of gel material A is, the epsom salt solution, modified sodium silicate, the flyash that are 1.9～2.0 by light calcined magnesia, proportion mix according to mass ratio 100:75:1:0.6:15, with 110 revs/min of stirrings, uniform stirring 10 minutes, can obtain cementitious material A.
Cementitious material B comprises that light calcined magnesia, Baume degrees are 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder, and the mass ratio of each composition is 100:76:25:3:0.6:6.
The preparation method of cementitious material B is is 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder by magnesia, Baume degrees, mix according to mass ratio 100:76:25:3:0.6:6, with 110 revs/min of stirrings, uniform stirring 10 minutes, become gelling slurry, again grid cloth is put into gelling slurry, after soaking into completely, obtained cementitious material B.
Cementitious material C comprises that light calcined magnesia, Baume degrees are 32 ° of gelatine solution, French chalk, rosin foams that B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentration are 7～9%, and the mass ratio of each composition is 100:60:3:3:0.6:8:15:8.
The preparation method of cementitious material C: (1) will form the composition of cementitious material C: light calcined magnesia, Baume degrees are that gelatine solution, French chalk, the rosin foam that 32 ° of B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentrations are 7～9% mixes according to the mass ratio 100:60:3:3:0.6:8:15:8 of each composition, with 110 revs/min of stirrings, uniform stirring 10 minutes, obtains inorganic coagulation material C.
The curing time of step (4) is 6-8h.
The labeled door of making through the inventive method, adopts GB/T7633-2008 inspection fire resistance, does not lose fire integrity at 1.6h, carrying on the back fiery average temperature rising 120 at 1.6h door leaf spends, maximum temperaturerise 125 is spent, and doorframe back side maximum temperaturerise 75 is spent, and does not lose fire insulation.Integral material test reaches A1 level noninflammability and ZA2 level is produced smoke toxicity standard, meets the standard of GB 12955-2008 labeled door country, and each performance parameter is improved than GB.
The compressive strength of door after tested: 145MPa, bending strength: 195MPa, anti-impact force: 15.5KJ/m2, content of formaldehyde: 0.1mg/L.Belong to E1 level, radioactivity: internal radiation index < 0.1, external exposure index < 0.1.Belong to A1 level.Three kinds of material cured are shaped to after labeled door, by the cutting of door entirety rice font, and the bonding state of three kinds of materials of each cut surface of surface observation, all very tight, there is no gap, the tensile shear strength of connection is greater than 10MPa after tested.
Embodiment bis-: the preparation method of a kind of labeled door that the present invention develops, comprise the steps, (1) in the mould of door coating adhesive gel material A as the surface layer of door: mould comprises die and flat-die, in die, coating adhesive gel material A is as the bottom surface layer of door, and in flat-die, coating adhesive gel material A is as the upper layer of door;
(2) in (1), on bottom surface layer, apply the skeleton of day font cementitious material B as door;
(3) after (2) step is processed, then to encapsulating compound gel material C in die;
(4) flat-die in (1) is covered on die, with the pressure matched moulds of 2～4 tons, after solidifying, form removal can obtain labeled door.
In step (1), cementitious material A comprises epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that light calcined magnesia, proportion are 1.9～2.0, and the mass ratio of each composition is 100:85:3:1:20.
The preparation method of gel material A, cementitious material B, cementitious material C is with embodiment mono-.
Cementitious material B comprises that light calcined magnesia, Baume degrees are 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder, and the mass ratio of each composition is 100:85:45:5:1:8.
Cementitious material C comprises that light calcined magnesia, Baume degrees are 32 ° of gelatine solution, French chalk, rosin foams that B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentration are 7～9%, and the mass ratio of each composition is 100:75:5:5:1:12:25:15.
The curing time of step (4) is 6-8h.
The labeled door of making through the inventive method, adopts GB/T7633-2008 inspection fire resistance, does not lose fire integrity at 1.6h, carrying on the back fiery average temperature rising 120 at 1.6h door leaf spends, maximum temperaturerise 125 is spent, and doorframe back side maximum temperaturerise 75 is spent, and does not lose fire insulation.Integral material test reaches A1 level noninflammability and ZA2 level is produced smoke toxicity standard, meets the standard of GB 12955-2008 labeled door country, and each performance parameter is improved than GB.
The compressive strength of door after tested: 145MPa, bending strength: 195MPa, anti-impact force: 15.5KJ/m2, content of formaldehyde: 0.1mg/L.Belong to E1 level, radioactivity: internal radiation index < 0.1, external exposure index < 0.1.Belong to A1 level.Three kinds of material cured are shaped to after labeled door, by the cutting of door entirety rice font, and the bonding state of three kinds of materials of each cut surface of surface observation, all very closely knit, there is no gap, the tensile shear strength of connection is greater than 10MPa after tested.
Embodiment tri-: the preparation method of a kind of labeled door that the present invention develops, comprise the steps, (1) in the mould of door coating adhesive gel material A as the surface layer of door: mould comprises die and flat-die, in die, coating adhesive gel material A is as the bottom surface layer of door, and in flat-die, coating adhesive gel material A is as the upper layer of door;
(2) in (1), on bottom surface layer, apply the skeleton of day font cementitious material B as door;
(3) after (2) step is processed, then to encapsulating compound gel material C in die;
(4) flat-die in (1) is covered on die, with the pressure matched moulds of 2～4 tons, after solidifying, form removal can obtain labeled door.
In step (1), cementitious material A comprises epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that light calcined magnesia, proportion are 1.9～2.0, and the mass ratio of each composition is 100:80:2:0.7:17.
The preparation method of gel material A, cementitious material B, cementitious material C is with embodiment mono-.
Cementitious material B comprises that light calcined magnesia, Baume degrees are 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder, and the mass ratio of each composition is 100:81:35:4:0.7:7.
Cementitious material C comprises that light calcined magnesia, Baume degrees are 32 ° of B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, gelatine solution, French chalk, rosin foam, and the mass ratio of each composition is 100:68:4:4:0.8:9:20:11.
The curing time of step (4) is 6-8h.
The labeled door of making through the inventive method, adopts GB/T7633-2008 inspection fire resistance, does not lose fire integrity at 1.6h, carrying on the back fiery average temperature rising 120 at 1.6h door leaf spends, maximum temperaturerise 125 is spent, and doorframe back side maximum temperaturerise 75 is spent, and does not lose fire insulation.Integral material test reaches A1 level noninflammability and ZA2 level is produced smoke toxicity standard, meets the standard of GB 12955-2008 labeled door country, and each performance parameter is improved than GB.
The compressive strength of door after tested: 145MPa, bending strength: 195MPa, anti-impact force: 15.5KJ/m2, content of formaldehyde: 0.1mg/L.Belong to E1 level, radioactivity: internal radiation index < 0.1, external exposure index < 0.1.Belong to A1 level.Three kinds of material cured are shaped to after labeled door, by the cutting of door entirety rice font, and the bonding state of three kinds of materials of each cut surface of surface observation, all very tight, there is no gap, the tensile shear strength of connection is greater than 10MPa after tested.
, also doorframe also can be adopted in this way and be made and obtain when the door that the present invention produces is installed concrete, uses of working in coordination, makes doorframe and has all improved the performance of fire-proof and thermal-insulation.
The restriction that the above is not made the present invention, all any amendments of doing in flesh and blood of the present invention, is equal to and replaces and simple modifications etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the preparation method of a labeled door, it is characterized in that, the method comprises the steps, (1) in the mould of door coating adhesive gel material A as the surface layer of door: mould comprises die and flat-die, in die, coating adhesive gel material A is as the bottom surface layer of door, and in flat-die, coating adhesive gel material A is as the upper layer of door;
(2) in (1), on bottom surface layer, apply the skeleton of day font cementitious material B as door;
(3) after (2) step is processed, then to encapsulating compound gel material C in die;
(4) flat-die in (1) is covered on die, with the pressure matched moulds of 2～4 tons, after solidifying, form removal can obtain labeled door.
2. the preparation method of labeled door according to claim 1, it is characterized in that, in step (1), cementitious material A comprises epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that light calcined magnesia, proportion are 1.9～2.0, and the mass ratio of each composition is 100:75～85:1～3:0.6～1:15～20.
3. the preparation method of labeled door according to claim 2, it is characterized in that, the preparation method of cementitious material A is, the epsom salt solution, modified sodium silicate, phosphoric acid, the flyash that are 1.9～2.0 by light calcined magnesia, proportion mix according to mass ratio 100:75～85:1～3:0.6～1:15～20, with 110 revs/min of stirrings, uniform stirring 10 minutes, can obtain cementitious material A.
4. the preparation method of labeled door according to claim 1, it is characterized in that, cementitious material B comprises that light calcined magnesia, Baume degrees are 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder, and the mass ratio of each composition is 100:76～85:25～45:3～5:0.6～1:6～8.
5. the preparation method of labeled door according to claim 4, it is characterized in that, the preparation method of cementitious material B is is 28 ° of B é magnesium chloride hexahydrate solution, silica, alundum (Al2O3), phosphoric acid, chlorobutadiene rubber powder by magnesia, Baume degrees, mix according to mass ratio 100:76～85:25～45:3～5:0.6～1:6～8, with 110 revs/min of stirrings, uniform stirring 10 minutes, becomes gelling slurry, again grid cloth is put into gelling slurry, after soaking into completely, obtained cementitious material B.
6. the preparation method of labeled door according to claim 1, it is characterized in that, cementitious material C comprises that light calcined magnesia, Baume degrees are 32 ° of gelatine solution, French chalk, rosin foams that B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentration are 7～9%, and the mass ratio of each composition is 100:60～75:3～5:3～5:0.6～1:8～12:15～25:8～15.
7. the preparation method of labeled door according to claim 6, it is characterized in that, the preparation method of cementitious material C: (1) will form the composition of cementitious material C: light calcined magnesia, Baume degrees are that gelatine solution, French chalk, the rosin foam that 32 ° of B é magnesium chloride hexahydrate solution, NNO surfactant, sodium phosphate trimer, phosphoric acid, mass concentrations are 7～9% mixes according to mass ratio 100:60～75:3～5:0.6～1:8～12:15～25:8～15 of each composition, with 110 revs/min of stirrings, uniform stirring 10 minutes, obtains inorganic coagulation material C.
8. the preparation method of labeled door according to claim 1, is characterized in that, the curing time of step (4) is 6-8h.
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| CN104047523A (en) * | 2014-07-08 | 2014-09-17 | 重庆宏杰门业有限责任公司 | Steel-wood fireproof door |
| CN112983226A (en) * | 2021-03-25 | 2021-06-18 | 安必安新材料集团有限公司 | Fireproof door leaf and processing technology thereof |
| CN114876334A (en) * | 2022-04-28 | 2022-08-09 | 安必安控股(北京)有限公司 | Preparation method of door leaf of fireproof door |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104047523A (en) * | 2014-07-08 | 2014-09-17 | 重庆宏杰门业有限责任公司 | Steel-wood fireproof door |
| CN112983226A (en) * | 2021-03-25 | 2021-06-18 | 安必安新材料集团有限公司 | Fireproof door leaf and processing technology thereof |
| CN114876334A (en) * | 2022-04-28 | 2022-08-09 | 安必安控股(北京)有限公司 | Preparation method of door leaf of fireproof door |
| CN114876334B (en) * | 2022-04-28 | 2024-02-20 | 安必安控股(北京)有限公司 | Preparation method of fireproof door leaf |
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| CN103982121B (en) | 2015-08-05 |
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