CN113668797A - Paper-surface gypsum board and preparation method thereof - Google Patents
Paper-surface gypsum board and preparation method thereof Download PDFInfo
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- CN113668797A CN113668797A CN202110903075.0A CN202110903075A CN113668797A CN 113668797 A CN113668797 A CN 113668797A CN 202110903075 A CN202110903075 A CN 202110903075A CN 113668797 A CN113668797 A CN 113668797A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 76
- 239000010440 gypsum Substances 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920002472 Starch Polymers 0.000 claims abstract description 74
- 235000019698 starch Nutrition 0.000 claims abstract description 74
- 239000008107 starch Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 27
- 239000004088 foaming agent Substances 0.000 claims abstract description 18
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000000887 hydrating effect Effects 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 20
- 229920000881 Modified starch Polymers 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 235000019426 modified starch Nutrition 0.000 claims description 9
- 239000004368 Modified starch Substances 0.000 claims description 8
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 239000011507 gypsum plaster Substances 0.000 claims description 4
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 229920001592 potato starch Polymers 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
- -1 sodium fatty alcohol Chemical class 0.000 claims 1
- 241000132536 Cirsium Species 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000843 powder Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 4
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 4
- 240000008042 Zea mays Species 0.000 description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 235000005822 corn Nutrition 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000011505 plaster Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 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 description 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 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229940083542 sodium Drugs 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/072—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of specially adapted, structured or shaped covering or lining elements
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/28—Polysaccharides or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The application discloses thistle board and preparation method thereof, thistle board includes board core and mask paper, the board core includes according to parts by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker, 0.25 to 4 parts of bonding starch, 0.2 to 0.3 part of plate type starch, 0 to 0.6 part of water reducing agent and 0 to 0.1 part of foaming agent; the method provided by the application can effectively prevent the gypsum board from being bonded poorly or having the paper-off phenomenon due to overhigh temperature when the gypsum board is dried in a drying system. The bonding between the core and the cover paper of the gypsum board is effectively improved.
Description
Technical Field
This document relates to, but is not limited to, gypsum building materials, and more particularly to, but not limited to, a method of placing a shift over a fire.
Background
In the production process of the gypsum board, when the gypsum board is not in the drying system in the drying process of the gypsum board (for example, the gypsum board is just started to be produced or the forming system is controlled to stop for more than half an hour due to equipment failure), the heat consumption of the drying system is slow, so that the temperature of the drying system is increased; at this time, because the temperature of the drying system is high, the quality of the front dozens of gypsum boards entering the drying system is unqualified (the phenomena of excessive heating or paper removal of the gypsum boards and the like) due to the high temperature of the drying system, so that the qualification rate of the gypsum boards is reduced, resources are wasted, and the production cost is increased.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
The technical scheme that this application provided solves when not having the gypsum board among the drying system (just start production or shut down in the production and cause the drying system not have the board), and too high (can reach more than 300 ℃) influence the problem of panel qualification rate of drying system temperature, improves the qualification rate of gypsum board, reduction in production cost reduces the waste of gypsum board, resources are saved. When the drying system is not provided with the board due to starting or stopping in production, the temperature in the drying machine is obviously increased compared with the normal temperature, and the dihydrate gypsum at the edge of the gypsum board is changed into the hemihydrate gypsum, so that the head of the gypsum board which just enters the drying system is over-fired.
The method provided by the application can effectively prevent the gypsum board from being bonded poorly or having the paper-off phenomenon due to overhigh temperature when the gypsum board is dried in a drying system. The bonding between the core and the cover paper of the gypsum board is effectively improved.
The application provides a thistle board, including board core and mask paper, the board core includes according to parts by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker, 0.25 to 4 parts of bonding starch, 0.2 to 0.3 part of plate type starch, 0 to 0.6 part of water reducing agent and 0 to 0.1 part of foaming agent;
optionally, the board core comprises, in parts by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker, 0.25 to 4 parts of bonding starch, 0.2 to 0.3 part of plate type starch, 0.4 to 0.6 part of water reducing agent and 0.05 to 0.1 part of foaming agent;
the preparation process also comprises water, and the using amount of the water is 70 to 80 parts; optionally, the paper-faced gypsum board is composed of the above raw materials.
In one embodiment provided herein, the binding starch is selected from modified starches; optionally, the modified starch has a viscosity of 50Pa · s to 100Pa · s.
In one embodiment provided herein, the plate-type starch is selected from one or more of pregelatinized modified corn starch, pregelatinized modified tapioca starch, and pregelatinized modified potato starch;
the molecular weight of the plate-type starch is less than 16000, the alkaline fluidity of the plate-type starch is 14s to 20s, the moisture content in the plate-type starch is less than 12 wt.%, and the pH value of the plate-type starch is 5 to 8.
Compared with common starch and pregelatinized starch, the plate-type starch has significantly reduced molecular weight, the molecular weight of the plate-type starch is less than 16000, the molecular weight of the common starch is between 16000 and 32000, and the molecular weight of the pregelatinized starch is greater than 32000. Plate-type starches are clearly distinguished from pregelatinized starches.
In one embodiment provided herein, the water reducing agent is selected from one or more of polycarboxylic acid water reducing agents and naphthalene water reducing agents.
In one embodiment provided herein, the foaming agent is selected from one or more of sodium lauryl sulfate, sodium dodecylbenzenesulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate.
In another aspect, the present application provides a method for preparing the above paper-surface gypsum board, comprising the following steps:
1) uniformly mixing the gypsum clinker and the plate-type starch to obtain a mixture 1
2) Uniformly mixing the mixture 1 with the water reducing agent, the bonding starch, the foaming agent and the water to prepare gypsum slurry;
3) overlapping, bonding and molding the gypsum slurry on a face-protecting paper to obtain a wet board, and drying the wet board to obtain a gypsum plaster board;
optionally, the method for preparing the paper-surface gypsum board consists of the steps.
In an embodiment provided by the present application, in step 2), the step of uniformly mixing specifically includes:
a) uniformly mixing the mixture 1 with the water reducing agent, the bonding starch and part of the water, and then mixing with a foaming agent to obtain a mixture 2;
b) and uniformly mixing the mixture 2 with the rest of the water to obtain the gypsum slurry.
In one embodiment provided herein, step b) is specifically to mix the mixture 2 with gas and the rest of the water uniformly;
in one embodiment provided herein, the gas is any one or more of compressed air, an inert atmosphere gas;
in one embodiment provided herein, the compressed air has a pressure of 0.08Mpa to 1.5Mpa and is used in an amount of 8 to 16 cubic meters per hour.
In one embodiment provided herein, in step 3), when the wet board enters the dryer, the board is absent from the dryer and the temperature in the dryer is 200 ℃ to 340 ℃, the board head faces a drying temperature of 200 ℃ to 340 ℃, optionally the board head faces a drying temperature of 250 ℃ to 340 ℃, preferably the board head faces a drying temperature of 300 ℃ to 340 ℃;
when the gypsum board in the dryer is saturated, the temperature of the dryer is 110 ℃ to 130 ℃, and the temperature of the gypsum board in the dryer is reduced to the right range of 110 ℃ to 130 ℃, so that the gypsum board with the length of the board head of 0 to 30 meters is effectively prevented from being over-fired, and the strength of the gypsum board is also improved through the synergistic effect of the components.
In yet another aspect, the present application provides the use of board-type starch to prevent excessive fire during the drying of gypsum plasterboard.
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 present application may be realized and attained by the invention in its aspects as described in the specification.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. 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.
The preparation method of the paper-surface gypsum board in the embodiment is as follows:
1) metering gypsum powder and plate type starch with preset weight, mixing in a mixing reamer, and then feeding into a mixing stirrer;
2) water, a water reducing agent and bonding starch with preset weight are metered and then enter a mixing stirrer through a screw pump;
3) mixing a foaming agent with a predetermined weight with part of water through a mixing pump, foaming through a bubbler together with compressed air, and entering a mixing stirrer;
4) the three materials are put into a mixing stirrer to be stirred to prepare uniform slurry, the slurry is continuously put between two layers of protective paper, the gypsum board is prepared after extrusion forming, and the finished product gypsum board is prepared after cutting, drying, edge sawing and edge sealing.
In the drying system in the step 4), a fluidized bed furnace is used as a heat source, the gypsum plaster boards continuously exchange heat with longitudinally flowing hot air while slowly advancing in a dryer, the board absorbs heat, the temperature is increased, and the temperature of the end can reach 340 ℃ at most.
When the thistle board runs long enough, the temperature of the dryer reaches a balance, and free moisture in the subsequent board slowly evaporates, but crystal water of dihydrate gypsum is not damaged. The normal temperature of the dryer is 110 ℃ to 130 ℃, and when the gypsum plaster board leaves the dryer, the water content of attached water is less than or equal to 1 percent.
Example 1
In this example, the amount of the calcined gypsum powder was 100 parts by weight, the plate type starch was 0.3 parts by weight, the amount of water used in step 2) was 75 parts by weight, the amount of the water reducing agent was 0.5 parts by weight, the amount of the adhesive starch was 2 parts by weight, the foaming agent was 0.06 parts by weight, the amount of water used in step 3 was 5 parts by weight, and the amount of compressed air was 10 cubic meters per hour, the pressure of the compressed air was 0.12MPa, and 2880 m/hr of the gypsum board produced per hour2。
The plate-type starch is corn pre-gelatinized starch, the alkaline fluidity of the plate-type starch is 16s, the water content is 11 wt.%, and the pH value is 6; the average molecular weight is less than 16000.
The board type starch is purchased from a special bonding powder factory for gypsum boards in Pingyi county.
The water reducing agent is a coagulation promoting type naphthalene liquid water reducing agent which is a naphthalene water reducing agent and is purchased from Laiwenlaier building materials Co.
The binding starch is modified starch, the viscosity is 70 Pa.s (about 27.00 g of starch is weighed and is accurate to 0.01 g, the modified starch is put into a 500ml high beaker, 450ml of deionized water is added, the dissolved starch is put on an electromagnetic stirrer for heating and stirring, when the time is reached to 15 minutes, the beaker is taken down, the beaker is placed at room temperature, after the temperature is cooled to 20 +/-1 ℃, the viscosity eta 2 is measured by a rotational viscosity meter, the unit is Pa.S, the average value is measured for three times, the model of the rotational viscosity meter is DNJ-5S, and the model of the rotational viscosity meter is 10 mpa.S to 1 x 105mpa·S)。
The foaming agent is sodium dodecyl sulfate and is purchased from Tooming Co.
Example 2
In this example, the amount of the plaster powder used was 100 parts by weight, the amount of the plate-type starch was 0.3 parts by weight, the amount of water used in step 2) was 75 parts by weight, the amount of the water reducing agent was 0.5 parts by weight, the amount of the adhesive starch was 0.5 parts by weight, the amount of the foaming agent was 0.06 parts by weight, the amount of water used in step 3 was 5 parts by weight, and the pressure of the compressed air was 0.12 Mpa; 2880m of gypsum board produced per hour2。
The plate-type starch is corn pre-gelatinized starch, the alkaline fluidity of the plate-type starch is 16s, the water content is 11 wt.%, and the pH value is 6; the average molecular weight is less than 16000.
The plate type starch is purchased from a special gypsum board bonding powder factory in Pingyi county.
The water reducing agent is a coagulation promoting type naphthalene liquid water reducing agent which is a naphthalene water reducing agent and is purchased from Laiweier building materials Limited company;
the binding starch is modified starch, the viscosity is 70 Pa.s (weighing about 27.00 g of starch, accurately to 0.01 g, placing into 500ml high beaker, adding 450ml deionized water, dissolving, placing on electromagnetic stirrer, heating and stirring, taking off the beaker when the time is up to 15 minutes, then placing at room temperature, and coolingCooling to 20 + -1 deg.C, measuring viscosity eta 2 with rotational viscometer (model DNJ-5S, 10mpa · S to 1 × 10) in Pa.S, and averaging three times5mpa·S)。
The foaming agent is sodium dodecyl sulfate which is purchased from Tooming Co.
Example 3
In this example, the amount of the plaster powder used was 100 parts by weight, 0.3 part by weight of the plate type starch, 75 parts by weight of the water used in step 2), 0.5 part by weight of the water reducing agent, 2 parts by weight of the adhesive starch, 0.08 part by weight of the foaming agent, 5 parts by weight of the water used in step 3, and 8 cubic meters per hour of compressed air, the pressure of which was 0.12 Mpa; 2880m of gypsum board produced per hour2。
The plate-type starch is corn pre-gelatinized starch, the alkaline fluidity of the plate-type starch is 16s, the water content is 11 wt.%, and the pH value is 6; the average molecular weight is less than 16000.
The plate type starch is purchased from a special gypsum board bonding powder factory in Pingyi county.
The water reducing agent is a coagulation promoting type naphthalene liquid water reducing agent which is a naphthalene water reducing agent and is purchased from Laiweier building materials Limited company;
the binding starch is modified starch, the viscosity is 70 Pa.s (about 27.00 g of starch is weighed and is accurate to 0.01 g, the modified starch is put into a 500ml high beaker, 450ml of deionized water is added, the dissolved starch is put on an electromagnetic stirrer for heating and stirring, when the time is reached to 15 minutes, the beaker is taken down, the beaker is placed at room temperature, after the temperature is cooled to 20 +/-1 ℃, the viscosity eta 2 is measured by a rotational viscosity meter, the unit is Pa.S, the average value is measured for three times, the model of the rotational viscosity meter is DNJ-5S, and the model of the rotational viscosity meter is 10 mpa.S to 1 x 105mpa·S)。
The foaming agent is sodium dodecyl sulfate which is purchased from Tooming Co.
Comparative example 1
The comparative example differs from example 1 only in that it does not involve a starch of the plate type, and the sources and amounts of the other components and the preparation method are exactly the same as in example 1.
Comparative example 2
The comparative example is different from example 1 only in that the plate type starch is used in an amount of 0.4 part, and the sources and amounts of other components and preparation methods are completely the same as example 1.
Comparative example 3
The comparative example is different from example 1 only in that the plate type starch is used in an amount of 0.1 part, and the sources and amounts of other components and preparation methods are completely the same as example 1.
Comparative example 4
This comparative example differs from example 1 only in that no binding starch is involved and the sources and amounts of the other components and the preparation method are exactly the same as in example 1.
Table 1: example and comparative example Performance statistics
The data are obtained under the conditions of the same paper roll and the same formula (except that the addition amount of the board-type starch is different), and from the data, the board-type starch has a certain reinforcing effect on the strength of the gypsum board, and the effect is more and more obvious along with the increase of the addition amount.
Influence of board-type starch on end bonding of gypsum board
The data are obtained under the conditions of the same paper roll and the same formula (except different addition amounts of the plate-type starch), and the plate-type starch plays a great role in adhering the end of the gypsum board from the aspect of data.
Influence of board type starch on high-temperature fire resistance of gypsum board
Before adding no board type starch, the production line can produce about 7500m gypsum board with poor end bonding caused by overhigh drying temperature per 100 ten thousand square meters of production line2After the board type starch is added, the production line does not produce gypsum boards with poor end bonding caused by overhigh drying temperature.
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 paper-surface gypsum board comprises a board core and a protective paper, wherein the board core comprises the following components in parts by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker, 0.25 to 4 parts of bonding starch, 0.2 to 0.3 part of plate type starch, 0 to 0.6 part of water reducing agent and 0 to 0.1 part of foaming agent;
optionally, the raw materials of the board core comprise, by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker, 0.25 to 4 parts of bonding starch, 0.2 to 0.3 part of plate type starch, 0.4 to 0.6 part of water reducing agent and 0.05 to 0.1 part of foaming agent.
2. The gypsum plasterboard of claim 1, wherein the binding starch is selected from the group consisting of modified starch; optionally, the modified starch has a viscosity of 50Pa · s to 100Pa · s.
3. The gypsum plasterboard of claim 1, wherein the board type starch is selected from one or more of a pregelatinized modified corn starch, a pregelatinized modified tapioca starch, and a pregelatinized modified potato starch;
the molecular weight of the plate-type starch is less than 16000, the alkaline fluidity of the plate-type starch is 14s to 20s, the moisture content in the plate-type starch is less than 12 wt.%, and the pH value of the plate-type starch is 5 to 8.
4. The paper-faced gypsum board of any one of claims 1-3, wherein the water reducing agent is selected from one or more of polycarboxylic acid-based water reducing agents and naphthalene-based water reducing agents.
5. The gypsum plasterboard of any one of claims 1 to 3, wherein the foaming agent is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate.
6. A method of making a paper-faced gypsum board according to any one of claims 1 to 5, comprising the steps of:
1) uniformly mixing the gypsum clinker and the plate-type starch to obtain a mixture 1
2) Uniformly mixing the mixture 1 with the water reducing agent, the bonding starch, the foaming agent and the water to prepare gypsum slurry;
3) and (3) overlapping, bonding and molding the gypsum slurry on a facing paper to obtain a wet board, and drying the wet board to obtain the gypsum plaster board.
7. The method for preparing a gypsum plasterboard according to claim 6, wherein in the step 2), the step of uniformly mixing specifically comprises:
a) uniformly mixing the mixture 1 with the water reducing agent, the bonding starch and part of the water, and then mixing with a foaming agent to obtain a mixture 2;
b) and uniformly mixing the mixture 2 with the rest of the water to obtain the gypsum slurry.
8. The method for preparing a gypsum plasterboard according to claim 6, wherein optionally, in step b), the mixture 2 is mixed with a gas and the remaining water;
optionally, the gas is any one or more of compressed air, inert atmosphere gas;
optionally, the compressed air has a pressure of 0.08Mpa to 1.5Mpa and the compressed air is used in an amount of 8 to 16 cubic meters per hour.
9. The method of making a paper-faced gypsum board according to claim 6, wherein in step 3), the wet board is fed into the dryer without board therein and the board head is subjected to a drying temperature of 200 ℃ to 340 ℃ at a temperature of 200 ℃ to 340 ℃, optionally 250 ℃ to 340 ℃, preferably 300 ℃ to 340 ℃.
10. The application of plate-type starch in preventing the fire phenomenon in the drying process of the paper-surface gypsum board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110903075.0A CN113668797A (en) | 2021-08-06 | 2021-08-06 | Paper-surface gypsum board and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110903075.0A CN113668797A (en) | 2021-08-06 | 2021-08-06 | Paper-surface gypsum board and preparation method thereof |
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| CN113668797A true CN113668797A (en) | 2021-11-19 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140113124A1 (en) * | 2012-10-23 | 2014-04-24 | United States Gypsum Company | Pregelatinized starch with mid-range viscosity, and product, slurry and methods related thereto |
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| CN111606732A (en) * | 2019-06-21 | 2020-09-01 | 中建材创新科技研究院有限公司 | Light high-strength paper-surface gypsum board and preparation method thereof |
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| CN105722861A (en) * | 2013-10-02 | 2016-06-29 | 美国石膏公司 | Method of preparing pregelatinized, partially hydrolyzed starch and related methods and products |
| CN111605263A (en) * | 2019-06-21 | 2020-09-01 | 中建材创新科技研究院有限公司 | High-strength fire-resistant paper-surface gypsum board and preparation method thereof |
| CN111606732A (en) * | 2019-06-21 | 2020-09-01 | 中建材创新科技研究院有限公司 | Light high-strength paper-surface gypsum board and preparation method thereof |
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Application publication date: 20211119 |