CN111606665A - High-sodium desulfurized gypsum plasterboard and preparation method thereof - Google Patents
High-sodium desulfurized gypsum plasterboard and preparation method thereof Download PDFInfo
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- CN111606665A CN111606665A CN201910379484.8A CN201910379484A CN111606665A CN 111606665 A CN111606665 A CN 111606665A CN 201910379484 A CN201910379484 A CN 201910379484A CN 111606665 A CN111606665 A CN 111606665A
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- Prior art keywords
- gypsum
- board
- desulfurized gypsum
- drying
- starch
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 200
- 239000010440 gypsum Substances 0.000 title claims abstract description 200
- 239000011734 sodium Substances 0.000 title claims abstract description 46
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 80
- 239000000463 material Substances 0.000 claims abstract description 64
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 54
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000010457 zeolite Substances 0.000 claims abstract description 54
- 239000002994 raw material Substances 0.000 claims abstract description 46
- 239000003365 glass fiber Substances 0.000 claims abstract description 37
- 229920002472 Starch Polymers 0.000 claims abstract description 35
- 239000008107 starch Substances 0.000 claims abstract description 35
- 235000019698 starch Nutrition 0.000 claims abstract description 35
- 239000011507 gypsum plaster Substances 0.000 claims abstract description 33
- 230000001681 protective effect Effects 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011259 mixed solution Substances 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 238000001179 sorption measurement Methods 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims description 18
- 229920000881 Modified starch Polymers 0.000 claims description 17
- 102000004169 proteins and genes Human genes 0.000 claims description 17
- 108090000623 proteins and genes Proteins 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 14
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 11
- 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
- 238000001816 cooling Methods 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000004952 Polyamide Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 241000132536 Cirsium Species 0.000 claims description 5
- 239000004368 Modified starch Substances 0.000 claims description 5
- 239000002639 bone cement Substances 0.000 claims description 5
- 235000019426 modified starch Nutrition 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 240000003183 Manihot esculenta Species 0.000 claims description 3
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 3
- 240000006394 Sorghum bicolor Species 0.000 claims description 3
- 235000011684 Sorghum saccharatum Nutrition 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 229960004106 citric acid Drugs 0.000 claims description 3
- 229940005740 hexametaphosphate Drugs 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229960005336 magnesium citrate Drugs 0.000 claims description 3
- 239000004337 magnesium citrate Substances 0.000 claims description 3
- 235000002538 magnesium citrate Nutrition 0.000 claims description 3
- 229940091250 magnesium supplement Drugs 0.000 claims description 3
- 235000011007 phosphoric acid Nutrition 0.000 claims description 3
- 229920001592 potato starch Polymers 0.000 claims description 3
- 235000018102 proteins Nutrition 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- PLSARIKBYIPYPF-UHFFFAOYSA-H trimagnesium dicitrate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O PLSARIKBYIPYPF-UHFFFAOYSA-H 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- 239000003463 adsorbent Substances 0.000 claims 1
- 230000002308 calcification Effects 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 238000006477 desulfuration reaction Methods 0.000 abstract description 10
- 230000023556 desulfurization Effects 0.000 abstract description 10
- 238000004806 packaging method and process Methods 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 6
- 239000011505 plaster Substances 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 40
- 230000000052 comparative effect Effects 0.000 description 21
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 12
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 10
- 238000007711 solidification Methods 0.000 description 10
- 230000008023 solidification Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 229910052925 anhydrite Inorganic materials 0.000 description 7
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910001415 sodium ion Inorganic materials 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009938 salting Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B13/08—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
- C04B2111/0062—Gypsum-paper board like 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Building Environments (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a high-sodium desulfurization gypsum plaster board and a preparation method thereof, wherein the plaster board comprises a board core and a protective paper outside the board core, and the board core comprises the following raw materials in parts by mass: 100 parts of desulfurized gypsum raw material, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch; and the side of the mask paper, which is in contact with the board core, is coated with an adsorption material. The preparation of the board core comprises the steps of crushing, drying and grinding the zeolite and desulfurized gypsum raw materials, and mixing the crushed, dried and ground zeolite and desulfurized gypsum raw materials with glass fibers to prepare a mixture; mixing water, retarder and starch to prepare a mixed solution; uniformly mixing the mixed solution and the mixture to prepare gypsum slurry; and spraying the gypsum slurry on a protective paper sprayed with a mixed solution of an adsorbing material and starch in advance, forming, solidifying, drying, combining pieces, sawing edges, sealing edges, and packaging to obtain the gypsum plaster board.
Description
Technical Field
The present invention relates to gypsum plaster board, and is especially high sodium desulfurized gypsum plaster board and its preparation process.
Background
The desulfurized gypsum is a product of flue gas desulfurization of a coal-fired power plant, and along with the popularization of a flue gas desulfurization project of the coal-fired power plant, the annual yield of the desulfurized gypsum in China is incredible. The desulfurized gypsum is widely used in industries such as building materials and the like, promotes the further development of national environmental protection circular economy, greatly reduces the exploitation amount of natural gypsum and protects resources. If the desulfurization gypsum can not be effectively treated and applied, not only is the resource waste, but also the secondary pollution is caused to the environment.
At present, the technology for preparing the paper-surface gypsum board by utilizing the desulfurized gypsum is mature, but the quality of the paper-surface gypsum board is still influenced due to unstable gypsum quality. From chemical composition analysis, the desulfurized gypsum is mainly composed of CaO and SO3And also includes Na2O，K2O, MgO, Cl and the like. Excessive sodium ions can bring quality problems of bonding, expansion, alkali resistance and the like to gypsum products, and in a humid environment, moisture absorption and crystallization of water-soluble salts can influence the bonding of the protective paper and the board core of the gypsum board, reduce the bonding capability of the protective paper and the board core in the humid environment and influence the application of the gypsum board.
The desulfurized gypsum raw materials produced by power plants in China generally have lower quality, larger quality difference and different product performances, so that Na is strictly controlled when the desulfurized gypsum enters the plant by each paper-surface gypsum board manufacturer+And the content of impurities and the like, the exceeding desulfurized gypsum is limited to be used so as to prevent the performance, especially the bonding performance, of the paper-surface gypsum board from being influenced. The application provides a method for improving the bonding performance of a gypsum plaster board prepared from high-sodium ion-content desulfurized gypsum.
Disclosure of Invention
The application provides a high-sodium desulfurized gypsum plasterboard and a preparation method thereof, which can use desulfurized gypsum with high sodium ion content as a raw material of the plasterboard and solve the technical problems of poor dehydration property and poor caking property of the plasterboard prepared by using the high-sodium ion desulfurized gypsum as a raw material.
The application provides a high-sodium desulfurized gypsum plaster board, wherein the plasterboard comprises a board core and a protective paper outside the board core, the raw material of the board core comprises desulfurized gypsum raw material with sodium oxide content recorded as x, and the content of water-soluble sodium oxide in the desulfurized gypsum raw material is more than 0.08 wt.% and less than or equal to 0.25 wt.%;
according to JC/T2074 plus 2011 flue gas desulfurization gypsum, the desulfurization gypsum meets the technical requirement regulation of more than three levels of desulfurization gypsum: water-soluble sodium oxide is less than or equal to 0.08 wt.%. To ensure the performance of the paper-surface gypsum board.
In the embodiment of the invention, the desulfurized gypsum raw material is desulfurized gypsum with high sodium oxide content, and the water-soluble sodium oxide content is as follows: 0.08 wt.% < x ≦ 0.25 wt.%;
in the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the surface of one side of the mask paper, which is in contact with the board core, is provided with an adsorbing material, and the adsorbing material is selected from one or more of zeolite, diatomite and fly ash, preferably zeolite;
in the high-sodium desulfurized gypsum plaster board provided by the invention, the specific surface area of the zeolite is 500-1000m2G, pore diameter of 0.40nm-0.60 nm.
In the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the raw materials of the board core comprise the following components: 100 parts of desulfurized gypsum raw material, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
In the high-sodium desulfurized gypsum plasterboard provided by the invention, the glass fiber is selected from one or more of medium-alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber.
In the high-sodium desulfurization gypsum plaster board provided by the invention, the length of the glass fiber is 9-15mm, and the diameter of the fiber monofilament is 10-15 um.
In the high-sodium desulfurized gypsum plaster board provided by the invention, the retarder is selected from one or more of citric acid, magnesium citrate, magnesium hexametaphosphate, borax, lignosulfonate, sodium carboxymethylcellulose, hydroxyethyl cellulose, phosphoric acid and protein retarder.
In the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the protein gypsum retarder is selected from one or two of bone glue protein retarder and protein gypsum retarder formed by calcium-calcified degraded polyamide.
In the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the starch is modified starch, and the starch has the following moisture content: 12 wt.% or less; pH value: 5-8; alkaline fluidity: 14-20 s. The modified starch is selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch.
In another aspect, the present invention provides a method for preparing the gypsum plaster board using the high-sodium desulfurized gypsum as a raw material, wherein the method comprises coating a mixed solution containing an adsorbing material on the side of the facing paper in contact with the board core.
The preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention comprises the following steps:
(1) weighing zeolite, fully and uniformly mixing the zeolite with the desulfurized gypsum raw material, and crushing the material while drying the material to dehydrate the desulfurized gypsum raw material to obtain desulfurized gypsum clinker;
(2) grinding the material obtained in the step (1) to be fine, increasing the specific surface area of the material, and then cooling the material to further stabilize the phase composition of the material;
(3) weighing glass fibers, mechanically stirring the glass fibers and the materials obtained in the step (2), and uniformly mixing;
(4) weighing water, a retarder and starch, and uniformly mixing to prepare a mixed solution 1;
(5) adding the material prepared in the step (3) into the mixed solution 1, and uniformly mixing to prepare gypsum slurry;
(6) spraying a mixed solution 2 of a starch solution and an adsorption material on the protective paper in advance;
(7) lapping and firmly adhering the uniformly stirred gypsum slurry and the mask paper for forming to obtain a wet plate;
(8) and (4) after the wet board is solidified, feeding the solidified wet board into a dryer, and drying the wet board to obtain the paper-surface gypsum board.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the materials in the step (1) are fully and uniformly mixed and then enter a grinding body of a hammer type scattering machine, the materials are scattered while being dried, a rotating rotor grinds the materials, and the materials are dried by hot air. The heat transfer occurs after the hot gas directly contacts with the gypsum, and the gypsum (CaSO4 & 2H2O) is heated and quickly dehydrated to become the plaster of Paris (CaSO4 & 1/2H2O, CaSO 4).
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the specific surface area of the desulfurized gypsum clinker ground in the step (2) is 3500-4000cm2The cooling temperature of the material cooling is 25-80 ℃.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board, the weight ratio of water, starch and the adsorbing material in the mixed solution 2 of the starch solution and the adsorbing material in the step (6) is 100:3-8: 1-5.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the water dosage in the step (6) is not more than 5% of the weight of the desulfurized gypsum raw material.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the uniformly stirred gypsum slurry in the step (5) is thrown onto the lower protective paper on a forming table under the action of centrifugal force, the gypsum slurry is extruded by a forming knife under the driving of the traction force of a solidification belt, so that the lower protective paper is folded into a right angle along the roller mark, the lower protective paper and the slurry are overlapped with the upper protective paper under the extrusion of the forming plate and are firmly bonded to form a wet board, and then the wet board is led out under the traction of the solidification belt to finish the forming.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the drying in the step (8) is more than two drying stages with decreasing drying temperature.
In the preparation method of the high-sodium desulfurized gypsum paper-surface gypsum board provided by the invention, the drying in the step (8) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 140-; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 80-120 ℃; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.
In the preparation method of the high-sodium desulfurized gypsum plaster board provided by the invention, the dried wet board is further subjected to plate combination, edge sawing, edge sealing and packaging to form the gypsum plaster board.
The invention provides a method for improving the bonding effect of a paper-surface gypsum board. The zeolite is a natural porous mineral, has developed pores, has a large number of pore channels and cavities in the crystal, has a large specific surface area and shows high adsorption performance. Mixing with desulfurized gypsum raw material, calcining, ball-milling, removing impurities of organic matter, etc. to obtain gypsum slurry, and adsorbing a certain quantity of sodium cation. On the other hand, sodium ions which cannot be adsorbed by the zeolite in the gypsum slurry migrate to the surface of the paper-faced gypsum board along with the starch and can be adsorbed by the zeolite on the surface of the mask paper, so that the influence of the sodium ions on bonding is reduced. The starch sprayed on the surface plays a role in strengthening and guaranteeing the bonding effect. Under the comprehensive action, the influence of moisture absorption and crystallization of water-soluble salt on the bonding capacity of the protective paper and the board core in a humid environment can be reduced, and the application of the gypsum board is influenced.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and methods described in the specification and claims.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the high-sodium desulfurized gypsum plaster board disclosed by the embodiment of the invention, the plaster board comprises a board core and a protective paper outside the board core, the raw material of the board core comprises desulfurized gypsum raw material with water-soluble sodium oxide content recorded as x, and the content of the water-soluble sodium oxide in the desulfurized gypsum raw material is more than 0.08 wt.% and less than or equal to x and less than or equal to 0.25 wt.%;
in the high-sodium desulfurized gypsum plaster board disclosed by the embodiment of the invention, the surface of one side, which is in contact with the board core, of the facing paper is provided with an adsorbing material, and the adsorbing material is selected from one or more of zeolite, fly ash and diatomite, preferably zeolite;
the specific surface area of the zeolite is 500-1000m2G, pore diameter of 0.40nm-0.60 nm.
In the high-sodium desulfurized gypsum paper-surface gypsum board disclosed by the embodiment of the invention, the raw materials of the board core comprise the following components: 100 parts of desulfurized gypsum raw material, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
In the high-sodium desulfurized gypsum paper-surface gypsum board disclosed by the embodiment of the invention, the specific surface area of the desulfurized gypsum clinker is 3500-4000cm2/g。
In the high-sodium desulfurized gypsum plaster board disclosed in the embodiment of the invention, the glass fiber is selected from one or more of medium-alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber.
In the high-sodium desulfurized gypsum plaster board disclosed by the embodiment of the invention, the length of the glass fiber is 9-15mm, and the diameter of the fiber monofilament is 10-15 um.
In the high-sodium desulfurized gypsum plaster board disclosed by the embodiment of the invention, the retarder is selected from one or more of citric acid, magnesium citrate, magnesium hexametaphosphate, borax, lignosulfonate, sodium carboxymethylcellulose, hydroxyethyl cellulose, phosphoric acid and protein retarder.
In the high-sodium desulfurized gypsum plaster board disclosed by the embodiment of the invention, the protein gypsum retarder is selected from one or two of bone glue protein retarder and protein gypsum retarder formed by calcium-calcified degraded polyamide.
In the high-sodium desulfurized gypsum plasterboard disclosed in the embodiment of the invention, the starch is modified starch, and the modified starch is selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch.
In the embodiment of the invention, the high-sodium desulfurization gypsum plaster board comprises a mixed solution which is coated on one side of a protective paper, which is in contact with a board core, and contains zeolite.
In the following examples, the desulfurized gypsum clinker used is made of desulfurized gypsum from solid waste produced by flue gas desulfurization in power plants; zeolite was produced by State invested flourishing Inc.; glass fibers were purchased from mineral products limited, Jinghang, Hebei. The modified corn starch is purchased from Jinan Yuan Tong chemical Co., Ltd; protein gypsum retarders, which are made by calcium-salting degraded polyamides, are available from shanghai and chemical ltd. The bone glue protein retarder was purchased from Linyi Black horse Gypsum building materials Co.
Example 1
The raw material desulfurized gypsum of the paper-faced gypsum board produced in this example had a water-soluble sodium oxide content of 0.24 wt.%.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
weighing 100 parts by weight of desulfurized gypsum raw material and 0.5 part by weight of zeolite, fully and uniformly mixing the zeolite and the desulfurized gypsum raw material, feeding the mixture into a grinding body of a hammer type scattering machine, scattering the material while drying, grinding the material by a rotating rotor, and drying the material by hot air. The heat transfer occurs after the hot gas directly contacts with the gypsum, and the gypsum (CaSO)4·2H2O) is rapidly dehydrated into plaster of paris (CaSO) after being heated4·1/2H2O、CaSO4)。
Secondly, the materials enter a ball mill to be ball-milled until the specific surface area of the desulfurized gypsum clinker is 3800cm2/g。
And step three, cooling the material to 35 ℃ to further stabilize the composition of the matter phase.
And step four, weighing 0.06 part by weight of medium alkali glass fiber (the length of the glass fiber is 9mm, and the diameter of a fiber monofilament is 10 microns), mechanically stirring the medium alkali glass fiber and the cooled material, and uniformly mixing to obtain a mixture.
Weighing 68 parts by weight of water, 0.25 part by weight of protein gypsum retarder formed by calcifying degraded polyamide and 0.2 part by weight of modified corn starch, and uniformly mixing to prepare a mixed solution.
And step six, adding the mixture into the mixed liquid prepared in the step five to prepare gypsum slurry.
And seventhly, spraying a layer of mixed solution of starch solution and zeolite on the surface protecting paper of the forming table in advance. Wherein, the water: modified corn starch: the weight ratio of the zeolite is 100: 3:1. Wherein the amount of water is 3 percent of the weight of the desulfurized gypsum raw material.
And step eight, throwing the uniformly stirred slurry onto the lower protective paper on the forming table under the action of centrifugal force, extruding the slurry by a forming cutter under the driving of traction force of a solidification belt, folding the lower protective paper into a right angle along the roller mark, overlapping the lower protective paper and the slurry with the upper protective paper under the extrusion of a forming plate, firmly bonding to form a wet plate, and then leading out the wet plate under the traction of the solidification belt to finish forming.
And step nine, solidifying the wet plate on a conveying belt, cutting off the wet plate, and then entering a dryer to perform three drying stages: the drying time of the first drying stage is 0.5h, and the drying temperature is 180 ℃; the drying time of the second drying stage is 0.6h, and the drying temperature is 120 ℃; the drying time of the third drying stage was 12h and the drying temperature was 60 ℃.
Step ten: and (4) combining the dried boards, sawing edges, sealing edges and packaging to form the gypsum plaster board.
Example 2
The raw material desulfurized gypsum of the paper-faced gypsum board prepared in this example had a water-soluble sodium oxide content of 0.45 wt.%.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
step one, weighing 100 weight parts of desulfurized gypsum raw material and 3.7 weight parts of zeolite, fully and uniformly mixing the zeolite and the desulfurized gypsum raw material, and feeding the mixture into a grinding body of a hammer type beater, whereinThe materials are scattered while being dried, the materials are ground by the rotating rotor, and the materials are dried by hot air. The heat transfer occurs after the hot gas directly contacts with the gypsum, and the gypsum (CaSO)4·2H2O) is rapidly dehydrated into plaster of paris (CaSO) after being heated4·1/2H2O、CaSO4)。
Secondly, the materials enter a ball mill to be ball-milled until the specific surface area of the desulfurized gypsum clinker is 3500cm2/g。
And step three, cooling the material to 55 ℃, and further stabilizing the composition of the matter phase.
Weighing 0.09 part by weight of alkali-free glass fiber (the length of the glass fiber is 15mm, and the diameter of a fiber monofilament is 15 mu m), mechanically stirring the alkali-free glass fiber and the cooled material, and uniformly mixing to obtain a mixture.
Weighing 70 parts of water, 0.5 part of bone glue protein retarder and 0.55 part of modified corn starch by weight, and uniformly mixing to prepare a mixed solution.
And step six, adding the mixture into the mixed liquid prepared in the step five to prepare gypsum slurry.
And seventhly, spraying a layer of mixed solution of starch solution and zeolite on the surface protecting paper of the forming table in advance. Wherein, the water: modified corn starch: the weight ratio of zeolite was 100:5: 3. Wherein the amount of water is 3 percent of the weight of the desulfurized gypsum raw material.
And step eight, throwing the uniformly stirred slurry onto the lower protective paper on the forming table under the action of centrifugal force, extruding the slurry by a forming cutter under the driving of traction force of a solidification belt, folding the lower protective paper into a right angle along the roller mark, overlapping the lower protective paper and the slurry with the upper protective paper under the extrusion of a forming plate, firmly bonding to form a wet plate, and then leading out the wet plate under the traction of the solidification belt to finish forming.
And step nine, solidifying the wet plate on a conveying belt, cutting off the wet plate, and then entering a dryer to perform three drying stages: the drying time of the first drying stage is 1h, and the drying temperature is 140 ℃; the drying time of the second drying stage is 1.5h, and the drying temperature is 80 ℃; the drying time of the third drying stage was 36h, and the drying temperature was 45 ℃.
Step ten: and (4) combining the dried boards, sawing edges, sealing edges and packaging to form the gypsum plaster board.
Example 3
The raw material desulfurized gypsum of the paper-faced gypsum board produced in this example had a water-soluble sodium oxide content of 1.28 wt.%.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
weighing 100 parts by weight of desulfurized gypsum raw material and 6.9 parts by weight of zeolite, fully and uniformly mixing the zeolite and the desulfurized gypsum raw material, feeding the mixture into a grinding body of a hammer type scattering machine, scattering the material while drying, grinding the material by a rotating rotor, and drying the material by hot air. The heat transfer occurs after the hot gas directly contacts with the gypsum, and the gypsum (CaSO)4·2H2O) is rapidly dehydrated into plaster of paris (CaSO) after being heated4·1/2H2O、CaSO4)。
Step two, the materials enter a ball mill to be ball-milled until the specific surface area of the desulfurized gypsum clinker is 4000cm2/g。
And step three, cooling the material to 75 ℃ to further stabilize the composition of the matter phase.
And step four, weighing 0.16 part by weight of alkali-resistant glass fiber (the length of the glass fiber is 12mm, and the diameter of a fiber monofilament is 12 microns), mechanically stirring the alkali-resistant glass fiber and the cooled material, and uniformly mixing to obtain a mixture.
Step five, weighing 72 parts by weight of water, 0.6 part by weight of protein gypsum retarder formed by calcifying degraded polyamide and 0.75 part by weight of modified corn starch, and uniformly mixing to prepare a mixed solution.
And step six, adding the mixture into the mixed liquid prepared in the step five to prepare gypsum slurry.
And seventhly, spraying a layer of mixed solution of starch solution and zeolite on the surface protecting paper of the forming table in advance. Wherein, the water: modified corn starch: the weight ratio of zeolite was 100:6: 4. Wherein the amount of water is 3% of the weight of the desulfurized gypsum raw material.
And step eight, throwing the uniformly stirred slurry onto the lower protective paper on the forming table under the action of centrifugal force, extruding the slurry by a forming cutter under the driving of traction force of a solidification belt, folding the lower protective paper into a right angle along the roller mark, overlapping the lower protective paper and the slurry with the upper protective paper under the extrusion of a forming plate, firmly bonding to form a wet plate, and then leading out the wet plate under the traction of the solidification belt to finish forming.
And step nine, solidifying the wet plate on a conveying belt, cutting off the wet plate, and then entering a dryer to perform three drying stages: the drying time of the first drying stage is 0.8h, and the drying temperature is 155 ℃; the drying time of the second drying stage is 1h, and the drying temperature is 110 ℃; the drying time of the third drying stage was 24h and the drying temperature was 45 ℃.
Step ten: and (4) combining the dried boards, sawing edges, sealing edges and packaging to form the gypsum plaster board.
Example 4
The raw material desulfurized gypsum of the paper-faced gypsum board produced in this example had a water-soluble sodium oxide content of 1.98 wt.%.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
weighing 100 parts by weight of desulfurized gypsum raw material and 9.7 parts by weight of zeolite, fully and uniformly mixing the zeolite and the desulfurized gypsum raw material, feeding the mixture into a grinding body of a hammer type scattering machine, scattering the material while drying, grinding the material by a rotating rotor, and drying the material by hot air. The heat transfer occurs after the hot gas directly contacts with the gypsum, and the gypsum (CaSO4 & 2H2O) is heated and quickly dehydrated to become the plaster of Paris (CaSO4 & 1/2H2O, CaSO 4).
Step two, the materials enter a ball mill to be ball-milled until the specific surface area of the desulfurized gypsum clinker is 4000cm2/g。
And step three, cooling the materials to 80 ℃ to further stabilize the composition of the matter phase.
And step four, weighing 0.18 part by weight of glass fiber, mechanically stirring the glass fiber and the materials, and uniformly mixing.
And step five, weighing 73 parts by weight of water, 0.6 part by weight of retarder and 0.75 part by weight of modified corn starch, and uniformly mixing.
And step six, adding a mixture of desulfurized gypsum clinker, zeolite and glass fiber into the mixed solution to prepare gypsum slurry.
And seventhly, spraying a layer of mixed solution of starch solution and zeolite on the surface protecting paper of the forming table in advance. Wherein, the water: modified corn starch: the weight ratio of the zeolite is 100: 8:5. The water consumption of the mixed solution is 4 percent of the weight of the desulfurized gypsum raw material.
And step eight, throwing the uniformly stirred slurry onto the lower protective paper on the forming table under the action of centrifugal force, extruding the slurry by a forming cutter under the driving of traction force of a solidification belt, folding the lower protective paper into a right angle along the roller mark, overlapping the lower protective paper and the slurry with the upper protective paper under the extrusion of a forming plate, firmly bonding to form a wet plate, and then leading out the wet plate under the traction of the solidification belt to finish forming.
And step nine, solidifying the wet plate on a conveying belt, cutting off the wet plate, and then entering a dryer to perform three drying stages: the drying time of the first drying stage is 0.6h, and the drying temperature is 165 ℃; the drying time of the second drying stage is 1.2h, and the drying temperature is 110 ℃; the drying time of the third drying stage was 24h and the drying temperature was 50 ℃.
Step ten: and (4) combining the dried boards, sawing edges, sealing edges and packaging to form the gypsum plaster board.
Comparative example 1
Gypsum plasterboard was prepared from the desulphurised gypsum of example 1 without addition of zeolite; and the seven steps spray water without spraying the mixed liquid of the starch and the zeolite. The remaining components were the same as in example 1, and the other steps for making the paper-faced gypsum board were the same as in example 1.
Comparative examples 1 to 1
Gypsum plasterboard was prepared from the desulfurized gypsum of example 1, zeolite was added; and the seven steps spray water without spraying the mixed liquid of the starch and the zeolite. The remaining components were the same as in example 1, and the other steps for making the paper-faced gypsum board were the same as in example 1.
Comparative example 2
Gypsum plasterboard was prepared from the desulphurised gypsum of example 1 without addition of zeolite; the seventh step is to spray the mixed solution of water and starch, the rest components are the same as the example 1, and the other steps for manufacturing the paper-surface gypsum board are also the same as the example 1.
Comparative example 2-1
Gypsum plasterboard was prepared from the desulfurized gypsum of example 2, zeolite was added; and seventhly, uniformly spraying zeolite powder on the surface of the mask paper. The remaining components were the same as in example 2, and the other steps for making the paper-faced gypsum board were the same as in example 2.
Comparative example 3
Thistle board was prepared using the desulfurized gypsum of example 3, step one, with no zeolite added, and fly ash added in the same weight parts as the zeolite. The remaining components were the same as in example 3, and the other steps for making the paper-faced gypsum board were the same as in example 3.
Comparative example 3-1
Thistle board was prepared using the desulfurized gypsum of example 3, except that zeolite was not added in step one, and the same weight parts of diatomaceous earth as zeolite were added. The remaining components were the same as in example 3, and the other steps for making the paper-faced gypsum board were the same as in example 3.
Comparative example 4
Common paper-faced gypsum board is commercially available.
Test example 1
The gypsum plasterboards of the examples and the comparative examples are tested according to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the physical and mechanical properties of the gypsum plasterboards are detected, and the results are shown in Table 1.
TABLE 1 thistle board Performance test results
As can be seen from Table 1, the gypsum plasterboard prepared in the embodiment of the present application can meet the physical and mechanical properties required by the building material industry standard in terms of performance. The comparative example is similar to the example in performance, and shows that the mechanical properties of the gypsum plasterboard cannot be influenced by adding the zeolite and spraying the mixed solution of the starch and the zeolite on the facing paper.
Test example 2
The adhesive property is divided into 5 grades, A grade: the paper boards are firmly bonded and are not separated after being lifted; b stage: a small part is separated, and a large part is intact; c level: half of the adhesive is firmly adhered, and the other half of the adhesive is separated; d stage: most of the materials are separated, and only a small part of the materials are firmly adhered; e, grade: the cardboard is totally separated.
The gypsum plasterboard of the examples and the comparative examples is tested by referring to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the dry bonding performance of the gypsum plasterboard is detected.
The wet and hot bonding performance test method comprises the following steps: and (3) performing hot steam curing on the prepared gypsum plaster board in a water bath kettle at 100 ℃ for 12 minutes, testing the bonding property of the gypsum plaster board by adopting a method of drawing an equilateral triangle, and finishing the test within 1 minute.
And (3) testing in a high-humidity environment: the prepared gypsum board is maintained under the high humidity condition (the temperature is 23 +/-2 ℃, and the relative humidity is 90 +/-3), and after the gypsum board reaches the specified age of 1 week, the bonding performance of the gypsum board is tested by adopting a method of drawing an equilateral triangle.
TABLE 2 paper-surface plasterboard bond property test results
The performance index detection in the present application is based on national and industry standards. As can be seen from Table 2, the paper-faced gypsum boards prepared in examples 1, 2, 3 and 4 of the present application have better bonding effect under humid and hot, high-humidity environmental conditions than the comparative examples. Compared with the comparative example, the two technical modes of adding zeolite into the gypsum plaster board core and spraying a layer of mixed solution of starch and zeolite on the facing paper have the auxiliary effect, and the adhesive property of the facing paper and the board core is enhanced.
Test example 3
The gypsum plasterboards of the examples and the comparative examples are tested by referring to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the damp deflection of the gypsum plasterboards is detected. In the national standard, a test method of the paper-surface gypsum board is standardized, but no clear standard quantity value is provided for the qualified range of the damp deflection.
TABLE 3 moisture deflection test results for paper-surface plasterboard
| Deflection under damp, mm. (32. + -. 2) DEG C, (90. + -.3)% | |
| Example 1 | 1.0 |
| Example 2 | 1.1 |
| Example 3 | 1.4 |
| Example 4 | 1.3 |
| Comparative example 1 | 3.4 |
| Comparative examples 1 to 1 | 3.6 |
| Comparative example 2 | 2.7 |
| Comparative example 2-1 | 3.0 |
| Comparative example 3 | 3.5 |
| Comparative example 3-1 | 3.3 |
| Comparative example 4 | 4.5 |
From the conclusion of test example 3, it can be seen that the gypsum plasterboards produced by the technical measures of the present application (examples 1, 2, 3 and 4) are comparable to those of comparative examples 1, 1-1; 2, 2-1; 3, 3-1; compared with 4, the flexibility of the gypsum plaster board can be obviously reduced. Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (10)
1. The high-sodium desulfurized gypsum plaster board comprises a board core and a protective paper outside the board core, wherein the raw material of the board core comprises desulfurized gypsum raw material with water-soluble sodium oxide content recorded as x, and the content of the water-soluble sodium oxide in the desulfurized gypsum raw material is more than 0.08 wt.% < x and less than or equal to 0.25 wt.%;
and the surface of one side of the mask paper, which is in contact with the board core, is provided with an adsorption material, and the adsorption material is selected from one or more of zeolite, diatomite and fly ash.
2. The high sodium desulfurized gypsum paper-faced gypsum board of claim 1 wherein the feedstock for said core comprises the following components: 100 parts of desulfurized gypsum raw material, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
3. The high sodium desulfurized gypsum thistle board of claim 2 wherein the glass fibers are selected from one or more of medium alkali glass fibers, alkali-free glass fibers, and alkali-resistant glass fibers;
the length of the glass fiber is 9-15mm, and the diameter of the fiber monofilament is 10-15 um.
4. The high sodium desulfurized gypsum paper-faced gypsum board of claim 2, wherein said set retarder is selected from one or more of citric acid, magnesium citrate, magnesium hexametaphosphate, borax, lignosulfonate, sodium carboxymethylcellulose, hydroxyethylcellulose, and phosphoric acid and protein-based set retarders;
the protein gypsum retarder is one or two of a bone glue protein retarder and a protein gypsum retarder formed by calcium calcification of degraded polyamide.
5. The high sodium desulfurized gypsum plasterboard of claim 2, wherein the starch is a modified starch selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch.
6. A method of making the high sodium desulfurized gypsum plasterboard of any one of claims 2 to 5, comprising coating the side of the facing paper in contact with the board core with a mixed solution comprising an adsorbent material.
7. The method of making a high sodium desulfurized gypsum plasterboard according to claim 6, comprising the steps of:
(1) weighing zeolite, fully and uniformly mixing the zeolite with the desulfurized gypsum raw material, and crushing the material while drying the material to dehydrate the desulfurized gypsum raw material to obtain desulfurized gypsum clinker;
(2) grinding the material obtained in the step (1) to be fine, increasing the specific surface area of the material, and then cooling the material to further stabilize the phase composition of the material;
(3) weighing glass fibers, mechanically stirring the glass fibers and the materials obtained in the step (2), and uniformly mixing;
(4) weighing water, a retarder and starch, and uniformly mixing to prepare a mixed solution 1;
(5) adding the material prepared in the step (3) into the mixed solution 1, and uniformly mixing to prepare gypsum slurry;
(6) spraying a mixed solution 2 of a starch solution and an adsorption material on the protective paper in advance;
(7) lapping and firmly adhering the uniformly stirred gypsum slurry and the mask paper for forming to obtain a wet plate;
(8) and (4) after the wet board is solidified, feeding the solidified wet board into a dryer, and drying the wet board to obtain the paper-surface gypsum board.
8. The method for preparing a high-sodium desulfurized gypsum thistle board according to claim 7, wherein the specific surface area of the desulfurized gypsum clinker ground in step (2) is 3500-4000cm2The cooling temperature of the material is 25-80 ℃;
in the step (6), the weight ratio of water, starch and the adsorption material in the mixed solution of the starch solution and the adsorption material is 100:3-8: 1-5;
the amount of water used in the step (6) is not more than 5% of the weight of the desulfurized gypsum raw material.
9. The method of making a high sodium desulfurized gypsum plasterboard according to claim 7, wherein the drying in step (8) is performed in more than two drying stages with decreasing drying temperatures.
10. The method for preparing a high-sodium desulfurized gypsum plasterboard according to claim 7, wherein the drying in step (8) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 140-180 ℃; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 80-120 ℃; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.
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| CN114349449A (en) * | 2021-11-23 | 2022-04-15 | 北新集团建材股份有限公司 | Paper-surface gypsum board and preparation method thereof |
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| US11999658B2 (en) | 2021-11-16 | 2024-06-04 | United States Gypsum Company | High salt gypsum wallboard containing salt absorbents and methods of making same |
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| WO2023091880A1 (en) | 2021-11-16 | 2023-05-25 | United States Gypsum Company | High salt gypsum wallboard containing salt absorbents and methods of making same |
| US11999658B2 (en) | 2021-11-16 | 2024-06-04 | United States Gypsum Company | High salt gypsum wallboard containing salt absorbents and methods of making same |
| CN114349449A (en) * | 2021-11-23 | 2022-04-15 | 北新集团建材股份有限公司 | Paper-surface gypsum board and preparation method thereof |
| US12297151B2 (en) | 2022-05-04 | 2025-05-13 | Knauf Gips Kg | Gypsum board from gypsum having high level of chloride salt and a polymer layer and methods associated therewith |
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