CN117602915A - Composition for gypsum board, gypsum board and preparation method of gypsum board - Google Patents
Composition for gypsum board, gypsum board and preparation method of gypsum board Download PDFInfo
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- CN117602915A CN117602915A CN202311637557.1A CN202311637557A CN117602915A CN 117602915 A CN117602915 A CN 117602915A CN 202311637557 A CN202311637557 A CN 202311637557A CN 117602915 A CN117602915 A CN 117602915A
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- 239000010440 gypsum Substances 0.000 title claims abstract description 178
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 178
- 239000000203 mixture Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000011521 glass Substances 0.000 claims abstract description 31
- 229920000881 Modified starch Polymers 0.000 claims abstract description 20
- 239000002657 fibrous material Substances 0.000 claims abstract description 20
- 239000004368 Modified starch Substances 0.000 claims abstract description 15
- 235000019426 modified starch Nutrition 0.000 claims abstract description 15
- 239000004816 latex Substances 0.000 claims abstract description 5
- 229920000126 latex Polymers 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 10
- 239000004005 microsphere Substances 0.000 claims description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 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 3
- -1 organic acid salt Chemical class 0.000 claims description 3
- 150000007524 organic acids Chemical group 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- 229910052925 anhydrite Inorganic materials 0.000 claims 1
- 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 claims 1
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 claims 1
- 239000011324 bead Substances 0.000 abstract description 23
- 238000009413 insulation Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 2
- 239000000839 emulsion Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 16
- 241000132536 Cirsium Species 0.000 description 14
- 239000002002 slurry Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 239000000440 bentonite Substances 0.000 description 7
- 229910000278 bentonite Inorganic materials 0.000 description 7
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 6
- 239000011268 mixed slurry Substances 0.000 description 6
- 238000004078 waterproofing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920002545 silicone oil Polymers 0.000 description 5
- 229920002472 Starch Polymers 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000012782 phase change material Substances 0.000 description 4
- 239000008107 starch Substances 0.000 description 4
- 235000019698 starch Nutrition 0.000 description 4
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000011507 gypsum plaster Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 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 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000013012 foaming technology Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical group [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229940095564 anhydrous calcium sulfate Drugs 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- HELHAJAZNSDZJO-OLXYHTOASA-L sodium L-tartrate Chemical group [Na+].[Na+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O HELHAJAZNSDZJO-OLXYHTOASA-L 0.000 description 1
- 239000001433 sodium tartrate Substances 0.000 description 1
- 229960002167 sodium tartrate Drugs 0.000 description 1
- 235000011004 sodium tartrates Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000002023 wood 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
-
- 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
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
The invention relates to a composition for a gypsum board, a gypsum board and a preparation method thereof, and belongs to the technical field of building materials. The composition for the gypsum board comprises desulfurized gypsum, hollow glass beads, redispersible latex powder, fiber materials and modified starch, wherein the hollow glass beads have the characteristics of light weight, hollowness and high strength, have a closed sphere structure, contain thin gas in the interior, and have the advantages of small heat conductivity coefficient, high strength, low density, low water absorption and high temperature resistance. The gypsum board prepared by the composition for the gypsum board has the advantages of low density, good thermal insulation effect, good stability, high temperature resistance, fire resistance, sound insulation, noise reduction and long service life. In addition, the gypsum board prepared by the gypsum board composition has high strength and high toughness, and can not deform, crack and mold when used in a humid environment.
Description
Technical Field
The invention relates to a composition for a gypsum board, a gypsum board and a preparation method thereof, and belongs to the technical field of building materials.
Background
The paper surface gypsum board comprises an upper facing paper layer, a gypsum board layer and a lower facing paper layer which are sequentially laminated from top to bottom. The paper gypsum board is a light board for building decoration and has the advantages of light weight, sound insulation, heat insulation, earthquake resistance, low shrinkage, high strength and the like. Paper faced plasterboards are therefore the best alternative to wood trim boards. In addition, the paper gypsum board has the advantages of low production cost and low price, and is widely applied to industrial and civil buildings.
At present, three main methods for improving the heat insulation performance of gypsum boards are as follows: physical foaming technology, composite insulation board technology and phase change material impregnation technology. The physical foaming technology can improve the porosity of the gypsum board, but when the gypsum board is prepared by the method, the size of cells in the gypsum board is not easy to control, and the foaming agent affecting the performance of the gypsum board can remain in the prepared gypsum board. The composite thermal insulation board technology is to compound a common paper gypsum board and a foamed polystyrene foam board by using an adhesive, the operation process of the method is complex, and the foamed polystyrene foam board in the prepared composite thermal insulation board is inflammable and can release toxic gas, so that the safety is poor. The phase-change material impregnation technology is that the phase-change material is impregnated into the gypsum board in a physical mixing mode, the phase-change material in the gypsum board prepared by the method is easy to leak, has poor stability and short service life, and the preparation process is complex, so that the actual production is not facilitated. In addition, inorganic lightweight fillers (such as expanded vermiculite and expanded perlite) can be added into the gypsum board slurry during the preparation of the gypsum board to improve the heat preservation performance of the gypsum board, but the inorganic lightweight fillers have hygroscopicity, so that the heat preservation performance of the gypsum board after water absorption is obviously reduced, and the application of the gypsum board in a humid environment is not facilitated.
In order to improve the heat preservation performance and the waterproof performance of the gypsum board, chinese patent document CN110698160A discloses a gypsum board slurry and a preparation method thereof, wherein the gypsum board slurry disclosed in the patent document comprises the following components in parts by mass: 100 to 200 parts of gypsum, 5 to 8 parts of bentonite, 40 to 60 parts of glass beads, 2 to 4 parts of anhydrous calcium sulfate whisker, 40 to 80 parts of heavy calcium carbonate, 0.5 to 1 part of organosilicon waterproofing agent, 30 to 50 parts of talcum powder, 0.2 to 0.8 part of polycarboxylate water reducer, 0.1 to 0.3 part of cellulose ether and 120 to 240 parts of water. Wherein, the gypsum is desulfurized gypsum after heat treatment, and the bentonite is bentonite modified by hydrochloric acid. The gypsum board slurry disclosed in this patent document contains bentonite having water absorption, and the bentonite undergoes volume expansion and is converted into gel after water absorption. When the gypsum board slurry is applied to the indoor paper surface gypsum board, the bentonite can effectively absorb moisture in indoor air, so that the gypsum is prevented from absorbing water and being affected with damp, and the flexural strength and the impact strength of the paper surface gypsum board are ensured. And moreover, the bentonite converted into gel can block fine cracks of the thistle board, so that an automatic repairing effect is achieved, and the strength of the thistle board is further improved. In addition, the gypsum board slurry disclosed in the patent document contains glass beads, and the glass beads have the advantages of light weight and good stability on one hand; on the other hand, the filler can be filled in the gaps of the gypsum matrix, so that the porosity of the gypsum matrix is reduced, and the aim of improving the strength of the paper-surface gypsum board on the premise of reducing the weight of the paper-surface gypsum board is fulfilled. However, the gypsum board prepared from the gypsum board slurry disclosed in the patent document has the defects of overlarge density, high volume weight, poor heat insulation and sound insulation effects, increased wall building load, increased construction cost, increased transportation cost and adverse to practical application.
Disclosure of Invention
The invention aims to provide a composition for gypsum boards, which can solve the problem that the density of gypsum boards prepared from the conventional composition for gypsum boards is too high.
The second purpose of the invention is to provide a paper surface plasterboard, which can solve the problem of overlarge density of the existing paper surface plasterboard.
The third object of the invention is to provide a preparation method of the thistle board, which can solve the problem of overlarge density of the thistle board prepared at present.
In order to achieve the above object, the gypsum board composition of the present invention adopts the following technical scheme:
the composition for the gypsum board comprises the following components in parts by weight: 60-80 parts of desulfurized gypsum, 10-40 parts of hollow glass microspheres, 5-10 parts of redispersible latex powder, 5-10 parts of fiber materials, 5-10 parts of modified starch, 0-0.05 part of retarder, 0-0.5 part of water reducer and 0-5 parts of waterproof agent.
The hollow glass microsphere in the gypsum board composition has the characteristics of light weight, hollowness and high strength, has a closed sphere structure, contains thin gas in the interior, and has the advantages of small heat conductivity coefficient, high strength, low density, low water absorption and high temperature resistance. The gypsum board prepared by the composition for the gypsum board has the advantages of low density, good thermal insulation effect, good stability, high temperature resistance, fire resistance, sound insulation, noise reduction and long service life. In addition, the gypsum board prepared by the gypsum board composition has high strength and high toughness, and can not deform, crack and mold when used in a humid environment.
Preferably, the desulfurized gypsum is anhydrous gypsum and/or semi-hydrated gypsum.
Preferably, the true density of the hollow glass beads is 0.12-1.60 g/cm 3 Bulk density of 0.10-0.62 g/cm 3 The average particle diameter is 2-130 μm. The hollow glass beads in the invention are white fluidity powder, and are transparent and hollow regular spheres when observed by a microscope. The true density of the hollow glass beads is too high, so that the density of the gypsum board under the same volume can be increased, and the true density of the hollow glass beads is too low, so that the strength of the gypsum board can be reduced; the average particle size of the hollow glass beads is too large, so that the flow property of slurry can be reduced, the production difficulty of gypsum boards is increased, the average particle size of the hollow glass beads is too small, the density of the gypsum boards can be reduced, and the heat insulation and sound insulation properties can not be effectively improved.
The redispersible emulsion powder has high binding capacity and unique properties (such as water resistance, workability, heat insulation and the like) and can improve the strength and the flexibility of the gypsum board at the same time, and is preferably ethylene-vinyl acetate copolymer rubber powder and/or styrene-acrylic ester copolymer rubber powder.
In order to increase the dissolution and dispersion speed of the redispersible emulsion powder, the average particle size of the redispersible emulsion powder is preferably 60-100 μm.
Preferably, the fibrous material is glass fiber.
Preferably, the length of the fiber material is 3-10 mm and the diameter is 10-30 μm.
There are many methods for modifying starch, and the main modification methods are physical modification, chemical modification, biological modification, composite modification, etc., and preferably, the modified starch is acidified modified corn starch.
Preferably, the mass part of the retarder is not less than 0.03 part; the mass part of the water reducer is not less than 0.05 part; the mass portion of the waterproof agent is not less than 3 portions.
The retarder is an additive capable of reducing the hydration speed and the hydration heat of gypsum and prolonging the setting time, and is preferably an organic acid retarder, an organic acid salt retarder, a phosphate retarder and a protein retarder. For example, the organic acid retarder is citric acid or tartaric acid, and the organic acid salt retarder is citrate or tartrate.
The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump of the gypsum board slurry basically unchanged, and mostly belongs to anionic surfactants, and preferably, the water reducing agent is a polycarboxylic acid water reducing agent and/or a naphthalene sulfonate water reducing agent.
Preferably, the waterproofing agent is a silicone waterproofing agent. Preferably, the waterproof agent is hydrogen-containing silicone oil emulsion. For example, the water-repellent is hydrogen-containing silicone oil emulsion of model XLD-822A manufactured by Jinan Xinglong chemical Co.
Preferably, the gypsum board composition further comprises water, wherein the mass part of the water is 60-85 parts.
The paper gypsum board adopts the following technical scheme:
a gypsum board comprising a facing paper layer and a gypsum board layer made from a gypsum board composition as described above.
The gypsum plaster board has the advantages of low density, good warm keeping effect, good stability, high temperature resistance, fire resistance, sound insulation, noise reduction and long service life, and has high strength and high toughness, and deformation, cracking and mildew can not occur when the gypsum plaster board is used in a humid environment.
The technical scheme adopted by the preparation method of the paper gypsum board is as follows:
the preparation method of the gypsum board comprises the following steps: the gypsum board composition as described above is formed into a gypsum board blank, and the gypsum board blank and the facing paper are bonded together, and the gypsum board is dried to obtain a gypsum board.
The preparation method of the paper gypsum board has the advantages of simple operation, low cost and convenient mass production. The gypsum board prepared by the invention has the advantages of low density, good thermal insulation effect, good stability, high temperature resistance, fire resistance, sound insulation, noise reduction and long service life, and has high strength and high toughness, and deformation, cracking and mildew can not occur when the gypsum board is used in a humid environment.
Preferably, the gypsum board composition comprises water, and the paper surface gypsum board is prepared by the following steps: and uniformly mixing the composition for the gypsum board to obtain slurry, pouring the slurry into a forming machine with the surface protection paper laid at the bottom, then scraping the slurry in the forming machine, laying a layer of surface protection paper on the surface of the scraped slurry, and drying to obtain the gypsum board.
Detailed Description
The hollow glass microsphere in the gypsum board composition has the characteristics of light weight, hollowness and high strength, has a closed sphere structure, contains thin gas in the interior, and has the advantages of small heat conductivity coefficient, high strength, low density, low water absorption and high temperature resistance. The gypsum board prepared by the composition for the gypsum board has the advantages of low density, good thermal insulation effect, good stability, high temperature resistance, fire resistance, sound insulation, noise reduction and long service life. In addition, the gypsum board prepared by the gypsum board composition has high strength and high toughness, and can not deform, crack and mold when used in a humid environment.
The redispersible emulsion powder in the composition for the gypsum board has high binding capacity and unique properties (such as water resistance, workability, heat insulation and the like) and can improve the strength and the flexibility of the gypsum board. The redispersible emulsion powder is ethylene-vinyl acetate copolymer rubber powder and/or styrene-acrylic ester copolymer rubber powder, and compared with other types of redispersible emulsion powder, the ethylene-vinyl acetate copolymer rubber powder and/or styrene-acrylic ester copolymer rubber powder can be dispersed and dissolved in water and then coagulated into a film, so that the cohesive force of the gypsum board can be enhanced, the cohesive force of the inside of the gypsum board and the interface between the gypsum board and the facing paper can be improved, and the flexural strength of the gypsum board and the adhesive strength of the gypsum board and the facing paper can be further improved.
The retarder in the gypsum board composition can reduce the hydration speed and hydration heat of gypsum and prolong the setting time.
The water reducing agent in the gypsum board composition can reduce the mixing water consumption under the condition of maintaining the slump of the gypsum board slurry to be basically unchanged.
The technical scheme of the invention is further described below with reference to specific embodiments.
1. Specific examples of the gypsum board composition of the present invention are as follows:
example 1
The gypsum board composition of the embodiment comprises the following components in parts by weight: 65 parts of desulfurized gypsum, 20 parts of hollow glass beads, 5 parts of redispersible emulsion powder, 5 parts of fiber materials, 5 parts of modified starch, 0.03 part of retarder, 0.05 part of water reducer, 3 parts of waterproofing agent and 70 parts of water; wherein, the parameters of the hollow glass bead are as follows: true density is 0.1574g/cm 3 Bulk density of 0.08g/cm 3 The average particle diameter was 120. Mu.m; the redispersible emulsion powder is ethylene-vinyl acetate copolymer emulsion powder, and the average granularity of the redispersible emulsion powder is 80 mu m; the fiber material is glassGlass fiber, the length of the fiber material is 9mm, and the diameter is 20 mu m; the modified starch is acidified modified corn starch (the manufacturer is Guangdong Huimei starch technology Co., ltd., product model is HM-J700); the retarder is citric acid; the water reducer is a commercially available polycarboxylate water reducer; the waterproof agent is hydrogen-containing silicone oil emulsion with the model XLD-822A manufactured by Jinan Xinglong chemical industry Co.
Example 2
The gypsum board composition of the embodiment comprises the following components in parts by weight: 80 parts of desulfurized gypsum, 40 parts of hollow glass beads, 10 parts of redispersible emulsion powder, 10 parts of fiber materials, 10 parts of modified starch, 0.05 part of retarder, 0.5 part of water reducer, 5 parts of waterproofing agent and 85 parts of water; wherein, the parameters of the hollow glass bead are as follows: true density is 0.3837g/cm 3 Bulk density of 0.20g/cm 3 The average particle diameter was 65. Mu.m; the redispersible emulsion powder is styrene-acrylic ester copolymer emulsion powder, and the average granularity of the redispersible emulsion powder is 60 mu m; the fiber material is glass fiber, the length of the fiber material is 3mm, and the diameter is 10 mu m; the modified starch is acidified modified corn starch (the manufacturer is Guangdong Huimei starch technology Co., ltd., product model is HM-J700); the retarder is tartaric acid; the water reducer is a commercially available polycarboxylate water reducer; the waterproof agent is hydrogen-containing silicone oil emulsion with the model XLD-822A manufactured by Jinan Xinglong chemical industry Co.
Example 3
The gypsum board composition of the embodiment comprises the following components in parts by weight: 70 parts of desulfurized gypsum, 25 parts of hollow glass beads, 7 parts of redispersible emulsion powder, 8 parts of fiber materials, 6 parts of modified starch, 0 part of retarder, 0 part of water reducer, 0 part of waterproofing agent and 60 parts of water; wherein, the parameters of the hollow glass bead are as follows: true density is 0.2597g/cm 3 Bulk density of 0.14g/cm 3 The average particle diameter was 65. Mu.m; the redispersible emulsion powder is ethylene-vinyl acetate copolymer emulsion powder, and the average granularity of the redispersible emulsion powder is 100 mu m; the fiber material is glass fiber, the length of the fiber material is 10mm, and the diameter is 30 mu m; the modified starch was an acidified modified corn starch (manufacturer is guangdong Huimei starch technologies limited,the model number of the product is HM-J700); the retarder is sodium tartrate; the water reducer is a commercially available naphthalene sulfonate water reducer; the waterproof agent is hydrogen-containing silicone oil emulsion with the model XLD-822A manufactured by Jinan Xinglong chemical industry Co.
2. The specific examples of the paper gypsum board and the preparation method thereof are as follows:
the paper-faced gypsum board of this example comprises an upper facing paper layer, a gypsum board layer and a lower facing paper layer which are laminated in this order from top to bottom, the gypsum board layer being made of the composition for gypsum board of any one of examples 1 to 3.
The preparation method of the thistle board of the embodiment 4-6 comprises the following steps: uniformly stirring desulfurized gypsum, hollow glass microspheres, redispersible latex powder, fiber materials, modified starch and retarder in the composition for gypsum board according to a proportion to obtain a mixture A; uniformly stirring a water reducing agent, a waterproof agent and water in the composition for the gypsum board according to a proportion to obtain a mixture B; adding the mixture A into the mixture B, stirring at 900rpm for 3min to obtain mixed slurry, pouring the mixed slurry into a flat plate forming machine with facing paper laid at the bottom, scraping the mixed slurry in the flat plate forming machine (the mixed slurry in the flat plate forming machine is a gypsum board blank), spreading a layer of facing paper on the surface of the scraped mixed slurry, standing the flat plate forming machine in an environment of 40+/-2 ℃, standing for 0.5h (gypsum final setting in the standing process), drying the flat plate forming machine at 160+/-2 ℃ for 30min, cooling to 45+/-2 ℃ for continuous drying for 24h, taking out the paper gypsum board from the flat plate forming machine, and finally cutting and trimming the paper gypsum board to obtain a finished product (the length is 210mm, the width is 120mm and the height is 9.5 mm) of the paper gypsum board.
The gypsum board compositions in the production methods of the gypsum boards of examples 4 to 6 were the gypsum board compositions of examples 1 to 3, respectively, in that order.
Comparative example 1
The preparation method of the paper-faced gypsum board of this comparative example was different from that of example 4 only in that the mass fraction of hollow glass microspheres in the gypsum board composition used in the preparation method of the paper-faced gypsum board of this comparative example was 0 part, the mass fraction of the desulfurized gypsum was 85 parts, and the mass fraction of the redispersible emulsion powder was 0 part.
Comparative example 2
The preparation method of the paper-faced gypsum board of the present comparative example was different from that of example 4 only in that the redispersible emulsion powder in the gypsum board composition used in the preparation method of the paper-faced gypsum board of the present comparative example was 0 parts by mass, and the fibrous material was 7.5 parts by mass, and the modified starch was 7.5 parts by mass.
Comparative example 3
The preparation method of the paper-faced gypsum board of the present comparative example was different from that of example 4 only in that the redispersible emulsion powder in the gypsum board composition used in the preparation method of the paper-faced gypsum board of the present comparative example was 7.5 parts by mass, and the fibrous material was 0 part by mass, and the modified starch was 7.5 parts by mass.
Comparative example 4
The preparation method of the paper-faced gypsum board of the present comparative example was different from that of example 4 only in that the redispersible emulsion powder in the gypsum board composition used in the preparation method of the paper-faced gypsum board of the present comparative example was 7.5 parts by mass, and the fibrous material was 7.5 parts by mass, and the modified starch was 0 part by mass.
Experimental example 1
To evaluate the properties of the gypsum plasterboards prepared in examples 4 to 6 and comparative examples 1 to 4, the gypsum plasterboards prepared in examples 4 to 6 and comparative examples 1 to 4 were tested for density, thermal conductivity and stability in a wet environment, respectively. The test method of the stability in the humid environment comprises the following steps: and (3) placing the thistle board in an environment with the temperature of 32+/-2 ℃ and the humidity of 90+/-3%RH for 48 hours, observing the appearance of the thistle board, if the thistle board is deformed, cracked or mildewed, determining that the stability test result of the thistle board in a wet environment is unqualified, and if the thistle board is not deformed, cracked or mildewed, determining that the stability test result of the thistle board in the wet environment is qualified. The test results of the density, thermal conductivity and stability in a wet environment of the thistle boards prepared in examples 4-6 and comparative examples 1-4 are shown in Table 1.
TABLE 1 Density, thermal conductivity and stability in humid environments of the paper facer gypsum boards prepared in examples 4-6 and comparative examples 1-4
Experimental example 2
In order to evaluate the effect of the addition amount of hollow glass beads on the properties such as density and strength of the gypsum board, the gypsum board was prepared again according to the method for preparing a gypsum board of example 4, except that the mass parts of hollow glass beads in the gypsum board composition used in preparing a gypsum board were adjusted from 20 parts to 0 part, 4 parts, 10 parts, 30 parts and 40 parts, respectively, in order, and then the density of the mixed slurry obtained in preparing a gypsum board was measured, and the density of the gypsum board layer in the gypsum board and the compressive strength of the gypsum board were measured, and the results are shown in table 2.
TABLE 2 influence of the addition amount of hollow glass microspheres on the density and strength of a gypsum plasterboard
To examine the effect of the true density, bulk density and average particle size of the hollow glass beads on the experimental results, a paper-faced gypsum board was repeatedly prepared according to the preparation method of the paper-faced gypsum board of example 4, except that the true density of the hollow glass beads was changed from 0.1574g/cm 3 Replaced by 0.12g/cm 3 Or 1.60g/cm 3 Or the bulk density of the hollow glass beads is changed from 0.08g/cm 3 Replaced by 0.10g/cm 3 Or 0.62g/cm 3 Or the average particle diameter of the hollow glass beads is replaced by 2 μm or 130 μm from 120 μm, and then the prepared gypsum plaster board is measured according to the methodTest results show that the stability test results of the thistle board prepared after parameter adjustment in a wet environment are all qualified, and the density and the heat conductivity are similar to those of the thistle board prepared in the embodiment 4.
Claims (10)
1. The composition for the gypsum board is characterized by comprising the following components in parts by weight: 60-80 parts of desulfurized gypsum, 10-40 parts of hollow glass microspheres, 5-10 parts of redispersible latex powder, 5-10 parts of fiber materials, 5-10 parts of modified starch, 0-0.05 part of retarder, 0-0.5 part of water reducer and 0-5 parts of waterproof agent.
2. The gypsum board composition of claim 1, wherein the desulfurized gypsum is anhydrite and/or hemihydrate gypsum.
3. The gypsum board composition of claim 1, wherein the hollow glass microspheres have a true density of from 0.12 to 1.60g/cm 3 Bulk density of 0.10-0.62 g/cm 3 The average particle diameter is 2-130 μm.
4. The gypsum board composition according to claim 1, wherein the redispersible latex powder is an ethylene-vinyl acetate copolymer powder and/or a styrene-acrylate copolymer powder.
5. The gypsum board composition of claim 1, wherein the fibrous material is glass fibers; the length of the fiber material is 3-10 mm, and the diameter is 10-30 mu m.
6. The gypsum board composition of claim 1, wherein the modified starch is an acidified modified corn starch.
7. The composition for gypsum board according to any one of claims 1 to 6, wherein the retarder is an organic acid retarder, an organic acid salt retarder, a phosphate salt retarder, a protein retarder; the water reducer is a polycarboxylate water reducer and/or a naphthalene sulfonate water reducer.
8. The composition for gypsum board according to any one of claims 1 to 6, further comprising water in an amount of 60 to 85 parts by mass.
9. A gypsum board comprising a facing paper layer and a gypsum board layer, wherein the gypsum board layer is made from the gypsum board composition of any one of claims 1-8.
10. The preparation method of the gypsum board is characterized by comprising the following steps: a gypsum board obtained by forming the gypsum board composition according to any one of claims 1 to 8 into a gypsum board blank, bonding the gypsum board blank and a facing paper, and drying the resultant gypsum board.
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