CN113185251A - Light high-strength fiber gypsum board and preparation method thereof - Google Patents
Light high-strength fiber gypsum board and preparation method thereof Download PDFInfo
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- CN113185251A CN113185251A CN202110546130.5A CN202110546130A CN113185251A CN 113185251 A CN113185251 A CN 113185251A CN 202110546130 A CN202110546130 A CN 202110546130A CN 113185251 A CN113185251 A CN 113185251A
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- Prior art keywords
- gypsum
- slurry
- water
- gypsum board
- mixed
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Links
- 239000010440 gypsum Substances 0.000 title claims abstract description 188
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 188
- 239000000835 fiber Substances 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000002002 slurry Substances 0.000 claims abstract description 70
- 239000011268 mixed slurry Substances 0.000 claims abstract description 44
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 claims abstract description 44
- 238000001035 drying Methods 0.000 claims abstract description 42
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000004368 Modified starch Substances 0.000 claims abstract description 18
- 229920000881 Modified starch Polymers 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 235000019426 modified starch Nutrition 0.000 claims abstract description 18
- 239000005871 repellent Substances 0.000 claims abstract description 17
- 230000002940 repellent Effects 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 13
- -1 polypropylene Polymers 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 9
- 239000001341 hydroxy propyl starch Substances 0.000 claims description 9
- 235000013828 hydroxypropyl starch Nutrition 0.000 claims description 9
- 229920001223 polyethylene glycol Polymers 0.000 claims description 9
- AVTYONGGKAJVTE-OLXYHTOASA-L potassium L-tartrate Chemical compound [K+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O AVTYONGGKAJVTE-OLXYHTOASA-L 0.000 claims description 9
- 239000001472 potassium tartrate Substances 0.000 claims description 9
- 229940111695 potassium tartrate Drugs 0.000 claims description 9
- 235000011005 potassium tartrates Nutrition 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 5
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- 235000011083 sodium citrates Nutrition 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 235000015165 citric acid Nutrition 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000006004 Quartz sand Substances 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- 239000005543 nano-size silicon particle Substances 0.000 claims description 2
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 239000002952 polymeric resin Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000006254 rheological additive Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 2
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 2
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 2
- 239000013008 thixotropic agent Substances 0.000 claims description 2
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000011507 gypsum plaster Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 238000010030 laminating Methods 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 7
- 238000009966 trimming Methods 0.000 description 7
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000006259 organic additive Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- SXFBQAMLJMDXOD-UHFFFAOYSA-N (+)-hydrogentartrate bitartrate salt Chemical compound OC(=O)C(O)C(O)C(O)=O.OC(=O)C(O)C(O)C(O)=O SXFBQAMLJMDXOD-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229940103272 aluminum potassium sulfate Drugs 0.000 description 1
- 239000003674 animal food additive Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 1
- 229940074439 potassium sodium tartrate Drugs 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A light high-strength fiber gypsum board and a preparation method thereof. The light high-strength fiber gypsum board is prepared from the following raw materials: the modified gypsum comprises desulfurized gypsum alpha powder, tobermorite slurry, mixed fibers, a water reducing agent, a retarder, an organic water repellent, a rheological agent, modified starch and water. The preparation method comprises the following steps: (1) mixing tobermorite slurry, a rheological agent and water to obtain mixed slurry A; (2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A, and uniformly stirring to obtain mixed slurry B; (3) adding desulfurized gypsum alpha powder into the mixed slurry B to obtain gypsum slurry; (4) and pouring the gypsum slurry into a pressure forming machine, forming, drying, maintaining and drying to obtain the gypsum plaster. The light high-strength fiber gypsum board has the advantages of low volume weight, high breaking strength and compressive strength, high fire resistance grade, low production cost and simple preparation method.
Description
Technical Field
The invention relates to a gypsum board and a preparation method thereof, in particular to a light high-strength fiber gypsum board and a preparation method thereof.
Background
As a traditional cementing material, gypsum has the advantages of light weight, heat insulation, sound insulation, stable size and the like, and is widely applied. Gypsum boards are widely used for interior partition walls, wall covering panels (instead of wall plastering layers), ceilings, sound absorbing panels, floor base boards, various decorative boards, and the like of various buildings such as houses, office buildings, shops, hotels, industrial plants, and the like.
However, the gypsum boards on the market generally have the problems of high volume weight, poor water resistance, low strength, low fire-proof grade and the like, are inconvenient to construct and have poor practicability.
CN111268986A discloses a light sandwich paperless gypsum board containing a high-strength phosphogypsum, which is prepared from the following raw materials in parts by weight: 10-20 parts of high-strength phosphogypsum, 80-90 parts of building gypsum, 1-3 parts of glass fiber mesh cloth, 3-10 parts of lime, 3-10 parts of heavy calcium carbonate, 0.02-0.8 part of composite foaming agent and 0.01-0.12 part of composite foam stabilizer. The gypsum board has low strength and large volume weight.
CN109896819A discloses a composite modified desulfurized gypsum board and a preparation method thereof, wherein the composite modified desulfurized gypsum board comprises a mixture A and a mixed solution B, the mass ratio of the mixture A to the mixed solution B is 1:0.36-0.48, and the mixture A comprises: calcining desulfurized gypsum, fly ash, calcined kaolin, clinker, quicklime and lignin fiber; the mixed liquid B comprises: water reducing agent, cellulose ether, modified waterproof agent and water; the preparation method comprises the steps of respectively preparing a mixture A and a mixed solution B, mixing and stirring the mixture A and the mixed solution B according to the mass ratio, and pressing and maintaining to obtain the composite modified desulfurized gypsum board. The gypsum board has complex preparation method and high production cost.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and providing the light high-strength fiber gypsum board which has high fire resistance level, low volume weight, proper flexural strength and compressive strength and low production cost.
The invention further aims to solve the technical problem of providing a preparation method of the light high-strength fiber gypsum board, which is simple and convenient to operate.
The invention solves the technical problem by adopting the technical scheme that the light high-strength fiber gypsum board is prepared from the following raw materials: the modified gypsum comprises desulfurized gypsum alpha powder, tobermorite slurry, mixed fibers, a water reducing agent, a retarder, an organic water repellent, a rheological agent, modified starch and water.
Further, the feed additive is prepared from the following raw materials in parts by weight: 40-90 parts of desulfurized gypsum alpha powder, 200-500 parts of tobermorite slurry, 2.5-10 parts of mixed fiber, 0.1-1.5 parts of water reducing agent, 0.1-1.5 parts of retarder, 0.1-0.5 part of organic water repellent, 0.15-0.3 part of rheological agent, 1-10 parts of modified starch and 20-60 parts of water.
Further, the mixed fiber is composed of polypropylene fiber and pulp fiber; the mass ratio of the two is preferably 1.0-2.5: 1.
The polypropylene fiber can improve the crack resistance, the impermeability and the breaking strength of the board, the paper pulp fiber can improve the impact resistance and the toughness of the board, and the mixed fiber formed by compounding the polypropylene fiber and the paper pulp fiber has high strength and high toughness.
Further, the mass ratio of the tobermorite slurry to the mixed fibers is 40-100: 1, and preferably 50-90: 1. Tobei mullite is a hydrated calcium silicate, and has the advantages of small volume weight, low heat conductivity coefficient, high temperature resistance, wear resistance and the like.
Further, the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a melamine water reducing agent, a naphthalene sulfonate water reducing agent, a sulfamate high-efficiency water reducing agent and a melamine water reducing agent.
The water reducing agent can greatly reduce the water consumption of the standard consistency of the desulfurized gypsum alpha powder, so that the strength of the gypsum used as a gel material is improved.
Further, the retarder is one or more of sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid and potassium tartrate.
After compression molding, the water content in the paste is greatly reduced, and the water consumption for standard consistency of the desulfurized gypsum alpha powder can be reduced due to the use of the water reducing agent, so that the hydration time of the gypsum is properly prolonged by adding the retarder, and the semi-hydrated gypsum gradually grows and grows in a staggered manner in the process of generating dihydrate gypsum crystals to form the light high-strength fiber gypsum board with high strength.
Further, the organic water repellent is one or more of sodium methyl silicate, silicone-acrylate emulsion, polyvinyl alcohol, a thixotropic agent, paraffin and polymer resin.
The organic water repellent can reduce the water absorption of the gypsum board, enhance the waterproof effect and the compressive strength of the gypsum board, increase the cohesiveness among mortar and improve the mechanical property of the gypsum board.
Further, the rheology modifier is one or two of hydrophilic nano silicon dioxide and polyethylene glycol. Because the tobermorite slurry is a pseudoplastic fluid, the filtered tobermorite can be stably suspended by adding the rheological agent, has good rheological property and is beneficial to mixing of the slurry.
Further, the modified starch is gypsum-dedicated high-substituted hydroxypropyl starch ether. The modified starch can promote the bonding performance of the mixed fiber, the tobermorite particles and the desulfurized gypsum alpha powder and enhance the flexibility of the gypsum board.
Further, the preparation method of the tobermorite slurry comprises the following steps:
(1) mixing a calcareous raw material and a quartz sand raw material according to the molar ratio of Ca element to Si element of 1: 0.8-1.05, adding water to prepare a suspension with the concentration of 10-30%, and then adding a caustic soda solution with the concentration of 20-35% as a catalyst to obtain a mixed slurry with the water-solid ratio of 10-30;
(2) carrying out synthetic reaction on the mixed slurry obtained in the step (1) in a closed container, wherein the stirring speed is 50-100rpm, the reaction temperature is 150-220 ℃, the reaction pressure is 1-5 Mpa, and the reaction time is 8-12 h to obtain slurry;
(3) and (3) sending the slurry obtained in the step (2) to a water washing pool, washing, performing solid-liquid separation, and collecting solids to obtain tobermorite slurry with the solid content of 10% -25%. The volume weight of the dried tobermorite slurry is 100-200kg/m3。
Further, the preparation method of the desulfurized gypsum alpha powder comprises the following steps:
(1) uniformly mixing the desulfurized gypsum raw material and the composite additive to obtain a mixture;
(2) carrying out dehydration and crystallization reaction on the mixture obtained in the step (1) in a closed container, wherein the reaction temperature is 120-150 ℃, the reaction pressure is 0.2-0.5 Mpa, the reaction time is 2-5 h, and then drying to obtain short column-shaped alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 80-200 meshes, and then forming to obtain the desulfurized gypsum alpha powder.
Further, the composite additive is formed by mixing an inorganic additive and an organic additive according to a mass ratio of 15-30: 1; the composite additive accounts for 0.8-2.5% of the total weight of the desulfurized gypsum raw material.
Further, the inorganic additive is one or more of potassium sulfate, aluminum potassium sulfate, calcium phosphate, potassium chloride and sodium sulfate; the organic additive is one or more of sodium citrate, potassium sodium tartrate, succinic acid, citric acid, oxalic acid, EDTA (tetracarboxylic acid), tartaric acid (2, 3-dihydroxy succinic acid), maleic acid and sodium lignosulphonate. The additive can promote the recrystallized crystals to generate towards short columns when the desulfurization gypsum is dissolved in the dehydration reaction, and only the short column-shaped desulfurization gypsum alpha powder has low standard water consumption and high breaking and compression strength.
Further, the drying temperature is 100-110 ℃; the drying time is 2-4 h, and the dehydration reaction and the drying are carried out in the same closed container.
The invention further solves the technical problem by adopting the technical scheme that the preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and continuously stirring to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) and (4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine for forming, wherein the forming machine is provided with a pre-designed mould, removing excessive moisture through filter pressing, drying the gypsum board formed through press forming, and curing and drying to obtain the light high-strength fiber gypsum board.
Further, in the step (3), the water consumption for the standard consistency of the desulfurized gypsum alpha powder is 0.3-0.5, the initial setting time is more than 3min, the final setting time is less than 30min, and the attached water content is less than 0.5%.
Further, in the step (4), the drying temperature is 38-42 ℃; the drying time is 4 hours; the curing temperature is normal temperature. The drying process is strictly controlled, and drying is not proper, so that the gypsum board is easy to deform, and the appearance and the quality of the gypsum board are affected.
Further, in the step (4), the pressure forming machine is a common hydraulic press, and the pressure range is 0-80 Mpa; the mould is formed by sleeving a stainless steel mould on a mould cavity formed by a stainless steel net, a backing plate and filter cloth.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the tobermorite with small volume weight, low thermal conductivity, high temperature resistance and wear resistance is added, the mixed fiber is added, and the synergistic effect of the tobermorite and the mixed fiber is utilized, so that the volume weight of the gypsum board can be reduced, the high temperature resistance and wear resistance of the gypsum board are improved, and the fire resistance grade is A grade; but also can enhance the compressive strength and the flexural strength of the gypsum board;
(2) the desulfurization gypsum raw material used by the invention is solid emission obtained by coal-fired industrial enterprises after treating sulfur dioxide in flue gas, and the desulfurization gypsum is recycled, so that the solid waste can be recycled, the economic benefit can be improved, and the environment can be beautified;
(3) the mechanical strength is the core performance index of the gypsum board, and the gypsum board is formed by adopting a slurry pressure forming machine, namely a mould pressing method, so that the excess moisture is discharged, and the mechanical strength of the gypsum board is improved;
research shows that a compression molding mode is adopted, appropriate moisture is added into gypsum slurry, the gypsum slurry is uniformly stirred, the gypsum slurry has certain fluidity, the mold filling is easy, the compression molding is facilitated, the mold sticking and the demolding are facilitated, but the water doping amount cannot be too high, the molding cannot be performed, the slurry leakage is caused, and the gypsum board after the compression molding is stuck to the mold and cannot be demolded; when the water content is reduced to the amount required by the hydration of the desulfurized gypsum alpha powder and accounts for 0.25-0.3 of the mass of the desulfurized gypsum alpha powder, the problem of sticking to a mold can be avoided, and the molding is facilitated; the pressure of the forming machine is properly controlled, so that the retained water can just completely hydrate all the semi-hydrated gypsum, namely the semi-hydrated gypsum is completely hydrated and gelatinized, and the redundant water can be discharged through the pressure;
(4) preferably, the lightweight high-strength fiber gypsum board is produced by a method comprising the following steps of carrying out heavy year by weight 400-900 kg/m (the volume weight of the existing paper-surface gypsum board and paperless gypsum board is generally carried out by a method of carrying out heavy year by more than 1000 kg/m); the breaking strength reaches 12.5MPa, the compressive strength reaches 28MPa, the strength is basically unchanged after the gypsum board is soaked in still water for 24 hours, the strength is higher than that of the traditional gypsum board, and the volume weight is low.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The preparation method of the desulfurized gypsum powder used in all the embodiments of the invention is the same, and comprises the following steps:
(1) uniformly mixing the desulfurized gypsum raw material with a composite additive, wherein the composite additive consists of calcium phosphate, aluminum sulfate and sodium citrate according to a weight ratio of 15:45:2, and the adding amount of the composite additive is 1.5 percent of the weight of the desulfurized gypsum raw material to obtain a mixture;
(2) carrying out dehydration and crystallization reaction on the mixture obtained in the step (1) in a closed container, wherein the reaction temperature is 125 ℃, the reaction pressure is 0.4Mpa, the reaction time is 3 hours, then drying is carried out, the drying temperature is 105 ℃, the drying time is 2 hours, and the dehydration reaction and the drying are carried out in the same closed container, so as to obtain short columnar alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 120 meshes, and then forming to obtain the desulfurized gypsum alpha powder.
Example 1
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 75 parts of desulfurized gypsum alpha powder, 250 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylate emulsion, 0.25 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 60 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 8min, the final setting time is 15min, and the attached water content is 20%, then drying the gypsum board formed by pressing, drying at 38-42 ℃ for 4h, curing at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
And (3) performance detection: the light high-strength fiber gypsum board of the embodiment is subjected to flexural strength, volume weight, fire resistance and compressive strength detection, and the detection results are shown in table 1. The results of the performance tests of the following examples are shown in Table 1.
Example 2
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 70 parts of desulfurized gypsum alpha powder, 300 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylic emulsion, 0.22 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 50 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 9min, the final setting time is 17min, and the attached water content is 20%, then drying the gypsum board formed by pressing, drying at 38-42 ℃ for 4h, curing at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
Example 3
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 65 parts of desulfurized gypsum alpha powder, 350 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylic emulsion, 0.2 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 40 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 10min, the final setting time is 19min, and the attached water content is 22%, then drying the gypsum board formed through compression, drying at 38-42 ℃ for 4h, maintaining at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
Example 4
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 55 parts of desulfurized gypsum alpha powder, 400 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylic emulsion, 0.18 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 30 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 12min, the final setting time is 23min, and the attached water content is 24%, then drying the gypsum board formed through compression, drying at 38-42 ℃ for 4h, curing at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
Example 5
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 40 parts of desulfurized gypsum alpha powder, 450 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylic emulsion, 0.16 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 20 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 13min, the final setting time is 25min, and the attached water content is 26%, then drying the gypsum board formed through compression, drying at 38-42 ℃ for 4h, maintaining at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
Example 6
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 75 parts of desulfurized gypsum alpha powder, 550 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylate emulsion, 0.25 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 60 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 8min, the final setting time is 15min, and the attached water content is 20%, then drying the gypsum board formed by pressing, drying at 38-42 ℃ for 4h, curing at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
The difference between this example and example 1 is that the weight parts of tobermorite slurry are increased to 550 parts, and the weight parts of other raw material components and the preparation method of the light high-strength fiber gypsum board are the same as example 1.
Example 7
The light high-strength fiber gypsum board is prepared from the following raw materials in parts by weight: 75 parts of desulfurized gypsum alpha powder, 150 parts of tobermorite slurry, 5 parts of mixed fiber (the mass ratio of polypropylene fiber to pulp fiber is 2.5: 1), 0.5 part of polycarboxylic acid water reducing agent, 0.5 part of potassium tartrate, 0.2 part of silicone-acrylic emulsion, 0.25 part of polyethylene glycol, 5 parts of hydroxypropyl starch ether and 60 parts of water.
The preparation method of the light high-strength fiber gypsum board comprises the following steps:
(1) mixing tobermorite slurry, a rheological agent and water, and stirring at a high speed for 2-3 minutes to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), mixing, and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, wherein the forming machine is provided with a pre-designed mold, removing excessive moisture through filter pressing, the pressure of the forming machine is 30Mpa, the initial setting time is 8min, the final setting time is 15min, and the attached water content is 20%, then drying the gypsum board formed by pressing, drying at 38-42 ℃ for 4h, curing at normal temperature and completely drying, trimming, grinding and shaping, and laminating to obtain the light high-strength fiber gypsum board product.
The difference between the example and the example 1 is that the weight part of the tobermorite slurry is reduced to 150 parts, and the weight parts of other raw material components and the preparation method of the light high-strength fiber gypsum board are the same as the example 1.
Comparative example 1
This example differs from example 1 in that tobermorite slurry was not added, and the parts by weight of the other raw material components and the method of producing the gypsum board were the same as in example 1.
Comparative example 2
The difference between this example and example 1 is that the mixed fiber was replaced with lignin fiber, and the weight parts of other raw material components and the method for producing gypsum board were the same as in example 1.
Detection methods or standard references for various properties: GBT 9775-;
table 1 Performance test results of light high-strength fiber gypsum boards of examples 1 to 7 and gypsum boards of comparative examples 1 to 2
The results of the performance tests of the light weight, high strength fibrous gypsum boards of examples 1-7 and the gypsum boards of comparative examples 1-2 in Table 1 show that:
1) according to the detection results of the light high-strength fiber gypsum boards in the embodiments 1 to 7, the light high-strength fiber gypsum board has the advantages of low volume weight, high flexural strength and compressive strength, and high fire resistance grade, and in the preferred scheme, when the weight portion of the tobermorite slurry is 200-500, the mass ratio of the tobermorite slurry to the mixed fibers is 40-100: 1, carrying out weight by volume of 400-900 kg/m and carrying out fire-resistant grade A; the breaking strength reaches 12.5MPa, and the compressive strength reaches 28 MPa;
2) the detection results of the light high-strength fiber gypsum boards in the embodiments 1 and 6 to 7 show that the mass ratio of tobermorite slurry to mixed fibers also affects the performance of the light high-strength fiber gypsum boards, and when the mass ratio of the tobermorite slurry to the mixed fibers is too large, the volume weight of the light high-strength fiber gypsum boards is reduced, but the flexural and compressive properties are deteriorated; when the mass ratio of the tobermorite slurry to the mixed fibers is too small, the volume weight of the light high-strength fiber gypsum board is obviously increased;
3) as can be seen from the detection results of the gypsum boards in the example 1 and the comparative examples 1-2, the volume weight of the gypsum board is very high in the comparative example 1 because tobermorite slurry is not used, and the strength of the gypsum board is obviously reduced although the volume weight of the gypsum board is not changed greatly after the mixed fiber is replaced by other fiber (lignin fiber) in the comparative example 2, so that the tobermorite slurry and the mixed fiber are indispensable raw materials of the gypsum board.
Claims (10)
1. A light high-strength fiber gypsum board is characterized by being prepared from the following raw materials: the modified gypsum comprises desulfurized gypsum alpha powder, tobermorite slurry, mixed fibers, a water reducing agent, a retarder, an organic water repellent, a rheological agent, modified starch and water.
2. The light weight high strength fiber gypsum board of claim 1, which is prepared from the following raw materials in parts by weight: 40-90 parts of desulfurized gypsum alpha powder, 200-500 parts of tobermorite slurry, 2.5-10 parts of mixed fiber, 0.1-1.5 parts of water reducing agent, 0.1-1.5 parts of retarder, 0.1-0.5 part of organic hydrophobic agent, 0.15-0.3 part of rheological agent, 1-10 parts of modified starch and 20-60 parts of water.
3. The light-weight high-strength fiber gypsum board as claimed in claim 1 or 2, wherein the mixed fiber is composed of polypropylene fiber and pulp fiber, and the mass ratio of the polypropylene fiber to the pulp fiber is 1.0-2.5: 1.
4. The lightweight high-strength fiber gypsum board according to any one of claims 1 to 3, wherein the mass ratio of tobermorite slurry to mixed fibers is 40-100: 1.
5. The light high-strength fiber gypsum board according to any one of claims 1 to 4, wherein the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a melamine water reducing agent, a naphthalene sulfonate water reducing agent, a sulfamate high-efficiency water reducing agent and a melamine water reducing agent; the retarder is one or more of sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid and potassium tartrate; the organic water repellent is one or more of sodium methyl silicate, silicone-acrylic emulsion, polyvinyl alcohol, thixotropic agent, paraffin and polymer resin; the rheology modifier is one or two of hydrophilic nano silicon dioxide and polyethylene glycol; the modified starch is gypsum special-purpose high-substituted hydroxypropyl starch ether.
6. The lightweight high-strength fiber gypsum board according to any one of claims 1 to 5, wherein the tobermorite slurry is prepared by a method comprising the following steps:
(1) mixing a calcareous raw material and a quartz sand raw material according to the molar ratio of Ca element to Si element of 1: 0.8-1.05, adding water to prepare a suspension with the concentration of 10-30%, and then adding a caustic soda solution with the concentration of 20-35% as a catalyst to obtain a mixed slurry with the water-solid ratio of 10-30;
(2) placing the mixed slurry obtained in the step (1) in a closed container for synthetic reaction, wherein the stirring speed is 50-100rpm, the reaction temperature is 150-220 ℃, the reaction pressure is 1-5 Mpa, and the reaction time is 8-12 hours, so as to obtain slurry;
(3) and (3) sending the slurry obtained in the step (2) to a water washing pool, washing, performing solid-liquid separation, and collecting solids to obtain tobermorite slurry with the solid content of 10% -25%.
7. The method for preparing the light high-strength fiber gypsum board according to any one of claims 1 to 6, wherein the method for preparing the desulfurized gypsum alpha powder comprises the following steps:
(1) uniformly mixing the desulfurized gypsum raw material and the composite additive to obtain a mixture;
(2) placing the mixture obtained in the step (1) in a closed container for dehydration and crystallization reaction, wherein the reaction temperature is 120-150 ℃, the reaction pressure is 0.2-0.5 Mpa, the reaction time is 2-5 h, and then drying to obtain short column-shaped alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 80-200 meshes, and then forming to obtain the desulfurized gypsum alpha powder.
8. A method of making a lightweight, high strength fibrous gypsum board according to any one of claims 1 to 7, comprising the steps of:
(1) mixing tobermorite slurry, a rheological agent and water, and continuously stirring to obtain mixed slurry A;
(2) adding mixed fibers, a retarder, a water reducing agent, an organic water repellent and modified starch into the mixed slurry A obtained in the step (1), and uniformly stirring to obtain mixed slurry B;
(3) adding desulfurized gypsum alpha powder into the mixed slurry B obtained in the step (2), and uniformly mixing to obtain gypsum slurry;
(4) and (4) pouring the gypsum slurry obtained in the step (3) into a pressure forming machine, forming, drying, maintaining and drying to obtain the light high-strength fiber gypsum board.
9. The method for preparing the light high-strength fiber gypsum board according to claim 8, wherein in the step (3), the water consumption for the standard consistency of the desulfurized gypsum alpha powder is 0.3-0.5, the initial setting time is more than 3min, the final setting time is less than 30min, and the attached water content is less than 0.5%.
10. The preparation method of the light-weight high-strength fiber gypsum board as claimed in claim 8 or 9, wherein in the step (4), the drying temperature is 38-42 ℃; the drying time is 4 hours; the curing temperature is normal temperature.
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| CN115959878A (en) * | 2022-12-26 | 2023-04-14 | 上海恩加岛建筑新材料科技有限公司 | Water-soaking bendable shaping gypsum substrate, preparation method thereof and application method for manufacturing special-shaped building |
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| CN115959878A (en) * | 2022-12-26 | 2023-04-14 | 上海恩加岛建筑新材料科技有限公司 | Water-soaking bendable shaping gypsum substrate, preparation method thereof and application method for manufacturing special-shaped building |
| CN115959878B (en) * | 2022-12-26 | 2024-03-22 | 上海恩加岛建筑新材料科技有限公司 | Water-soaking bendable shaping gypsum substrate, preparation method thereof and application method for manufacturing special-shaped building |
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