CN111606666A - Paper-surface gypsum board and preparation method thereof - Google Patents
Paper-surface gypsum board and preparation method thereof Download PDFInfo
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- CN111606666A CN111606666A CN201910382628.5A CN201910382628A CN111606666A CN 111606666 A CN111606666 A CN 111606666A CN 201910382628 A CN201910382628 A CN 201910382628A CN 111606666 A CN111606666 A CN 111606666A
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- 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
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- 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
- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a paper-surface gypsum board and a preparation method thereof, wherein the paper-surface gypsum board comprises the following raw materials in parts by mass: 100 parts of desulfurized gypsum, 0.5-10 parts of modified starch, 50-70 parts of water and 1-10 parts of modified natural zeolite. The preparation method of the paper-surface gypsum board comprises the following steps: firstly, uniformly mixing water and modified starch to prepare a mixed solution; secondly, uniformly mixing the desulfurized gypsum and the modified natural zeolite to prepare a mixture; then uniformly mixing the mixed solution and the mixture to prepare gypsum slurry; then lapping and firmly adhering the gypsum slurry and the protective paper for molding to prepare a wet plate; and finally, after the wet board is solidified, the wet board enters a drier, and the dried wet board is the paper-surface gypsum board. The gypsum plaster board solves the problem that the prepared gypsum plaster board with high impurity ion desulfurized gypsum as a raw material has poor dehydration performance and caking property, and the prepared gypsum plaster board has good bonding effect because the board core and the mask paper are not peeled off under severe test conditions.
Description
Technical Field
The present invention relates to building material technology, and is especially one kind of gypsum plaster board and its making process.
Background
The gypsum board is used as a modern building environment-friendly material, has the characteristics of light weight, high strength and environment friendliness, and can improve the building energy-saving effect. Meanwhile, the main raw material of the gypsum board is industrial byproduct gypsum, and a large amount of desulfurized gypsum generated by flue gas desulfurization of a thermal power plant can continuously occupy land and break the environment if the desulfurized gypsum is not treated in time; therefore, the production of gypsum board plays a great role in the utilization of desulfurized gypsum.
Disclosure of Invention
In the preparation of the gypsum board, certain requirements are imposed on the raw materials of the gypsum board, the growth of gypsum crystals can be influenced to a great extent by the content of chloride ions, and various parameters such as the bonding property, the mechanical property and the like of the prepared gypsum board are influenced. The application provides a preparation method for improving the adhesive property and the mechanical property of a paper-surface gypsum board prepared by taking high-impurity ion desulfurized gypsum as a raw material. The proper increase of the starch content can enhance the bonding performance of the gypsum board, but the excessive addition increases the resistance in the water and starch transfer process, is not beneficial to the subsequent drying of the gypsum board, and influences the bonding performance of the gypsum board. Compared with the prior art, the zeolite introduced into the gypsum board has a three-dimensional pore system, and the internal cavity of the zeolite enables the zeolite to have good adsorbability, and the specific polar adsorbability of the zeolite can tightly adsorb impurity ions in the gypsum, so that the impurity ions are prevented from migrating to the surface of the gypsum board, and the adhesive property of the gypsum board is prevented from being influenced. Untreated high impurity ion desulfurized gypsum is currently on the market.
The application provides a gypsum plaster board and a preparation method thereof, which solve the technical problems of poor dehydration property and poor caking property of the gypsum plaster board prepared by taking high impurity ion desulfurized gypsum as a raw material.
The application provides a thistle board, wherein, thistle board includes the mask paper in board core and the board core outside, the board core contains following raw materials: 100 parts of desulfurized gypsum, 0.5-10 parts of modified starch, 50-70 parts of water and 1-10 parts of modified natural zeolite. Optionally, the core material of the board consists of 100 parts by weight of desulfurized gypsum, 0.5-10 parts by weight of modified starch, 50-70 parts by weight of water and 1-10 parts by weight of modified natural zeolite.
The desulfurized gypsum is selected from one or more of high-chlorine desulfurized gypsum, high-magnesium desulfurized gypsum and high-sodium desulfurized gypsum.
In the paper-surface gypsum board provided by the invention, the content of chloride ions in the high-chlorine desulfurized gypsum is 500-1000 mg/kg.
In the paper-surface gypsum board provided by the invention, the high-magnesium desulfurized gypsum is desulfurized gypsum with water-soluble magnesium oxide content marked as x, and the content of the water-soluble magnesium oxide in the desulfurized gypsum is more than 0.2 wt.% and less than or equal to x and less than or equal to 2.5 wt.%;
in the gypsum plaster board provided by the invention, the high-sodium desulfurized gypsum is desulfurized gypsum with the content of water-soluble sodium oxide recorded as y, and the content of the water-soluble sodium oxide in the desulfurized gypsum is more than 0.08 wt.% and less than or equal to y and less than or equal to 0.25 wt.%.
In the paper-surface gypsum board provided by the invention, the particle size of the modified starch is 80-150 meshes.
In the paper-faced gypsum board provided by the present invention, the natural zeolite is selected from one or more of analcime, mordenite and clinoptilolite.
In the gypsum plaster board provided by the invention, the particle size of the natural zeolite is 80-400 meshes, preferably 200-325 meshes.
In another aspect, the present invention provides a method for preparing the above paper-surface gypsum board, comprising the following steps:
(1) uniformly mixing water and modified starch to prepare a mixed solution;
(2) uniformly mixing desulfurized gypsum and modified natural zeolite, and calcining to obtain a mixture of calcined gypsum and modified natural zeolite;
(3) uniformly mixing the mixed solution and the mixture to prepare gypsum slurry;
(4) lapping and firmly adhering the gypsum slurry and the face protective paper for forming to prepare a wet plate;
(5) 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.
Optionally, the preparation method of the paper-surface gypsum board consists of the steps.
In the preparation method of the gypsum plaster board provided by the invention, the modified natural zeolite is prepared by calcining natural zeolite at high temperature, wherein the calcining temperature of the high-temperature calcining is 200-600 ℃, and the calcining time is 1-2 h.
In the preparation method of the gypsum plaster board provided by the invention, the calcination temperature of the high-temperature calcination in the step (2) is 110-270 ℃, and the calcination time is 1-3 h.
In the method for producing a gypsum plasterboard according to the present invention, the drying in step (5) includes two or more drying stages in which the drying temperature decreases.
In the preparation method of the paper-surface gypsum board, the drying in the step (5) has three stages, the drying time of the first stage is 0.1-1h, and the drying temperature is 140-165 ℃; the drying time of the second stage is 0.1-2h, the drying temperature is 80-120 ℃, the drying temperature of the third stage is 40-60 ℃, and the drying is carried out until the weight is constant.
The invention provides a method for improving the bonding effect of a paper-surface gypsum board. Wherein the zeolite is natural porous mineral, has developed pores, and has good adsorbability, ion exchange property, catalysis, acid resistance, heat resistance and the like. The zeolite has large adsorption capacity to polar molecules or ions, and can adsorb impurity ions migrating to the surface in time in the use of the gypsum with high impurity ions, so that the influence of the impurity ions on the bonding performance of the gypsum board is prevented; meanwhile, a large number of holes and pore channels in the zeolite crystal can fully adsorb moisture and free impurity ions after being wetted, and the moisture absorption performance and the mechanical property of the gypsum board are improved.
In order to remove organic matters in zeolite pore channels and fully exert the adsorption performance of the zeolite, before the zeolite is used, modification treatment is carried out, the zeolite and ethanol are mixed and fully ground until the ethanol is completely volatilized, the mixture is placed in a muffle furnace for roasting at high temperature (200 plus 600 ℃) for 1 to 2 hours, and then the mixture is placed in a drier for cooling and sieving.
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
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the claims. 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 embodiment of the invention provides a paper-surface gypsum board, wherein the paper-surface gypsum board comprises a board core and a protective paper outside the board core, and the board core is composed of the following raw materials: 100 parts of desulfurized gypsum, 0.5-10 parts of modified starch, 50-70 parts of water and 1-10 parts of modified natural zeolite. Optionally, the core material of the board consists of 100 parts by weight of desulfurized gypsum, 0.5-10 parts by weight of modified starch, 50-70 parts by weight of water and 1-10 parts by weight of modified natural zeolite.
The desulfurized gypsum is selected from one or more of high-chlorine desulfurized gypsum, high-magnesium desulfurized gypsum and high-sodium desulfurized gypsum. The desulfurized gypsum used in the embodiment of the invention is desulfurized gypsum raw material.
In the embodiment of the invention, the content of chloride ions in the high-chlorine desulfurization gypsum is 500-1000 mg/kg.
In the embodiment of the invention, the high-magnesium desulfurized gypsum is desulfurized gypsum with water-soluble magnesium oxide content marked as x, and the content of the water-soluble magnesium oxide in the desulfurized gypsum is more than 0.2 wt.% and less than or equal to x and less than or equal to 2.5 wt.%;
in the embodiment of the invention, the high-sodium desulfurized gypsum is desulfurized gypsum with the content of water-soluble sodium oxide recorded as y, and the content of the water-soluble sodium oxide in the desulfurized gypsum is more than 0.08 wt.% and less than or equal to y and less than or equal to 0.25 wt.%.
In the embodiment of the invention, the particle size of the modified starch is 80-150 meshes.
In an embodiment of the invention, the natural zeolite is selected from one or more of analcime, mordenite and clinoptilolite.
In the embodiment of the invention, the particle size of the natural zeolite is 80-400 meshes, preferably 200-325 meshes; the pore diameter of the modified natural zeolite is 0.4-0.8 nm.
Example 1:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 68 parts by weight of water and 0.5 part by weight of modified starch, and stirring to obtain a mixed solution; roasting clinoptilolite at 250 ℃ for 2h to obtain modified clinoptilolite;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the chloride ion content of 586mg/kg and 9 parts of modified clinoptilolite by weight, and calcining at 150 ℃ for 1h to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 150 ℃ for half an hour, turning to 100 ℃ for drying for one hour, and finally turning to 40 ℃ for drying to constant weight.
Example 2:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 65 parts by weight of water and 5 parts by weight of modified starch, and stirring to obtain a mixed solution; roasting the analcime at 300 ℃ for 1.5h to obtain modified analcime;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the chloride ion content of 672mg/kg and 5 parts of modified analcime by weight, and calcining at 110 ℃ for 2 hours to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
Example 3:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 68 parts by weight of water and 9 parts by weight of modified starch, and stirring to obtain a mixed solution; roasting clinoptilolite at 550 ℃ for 1h to obtain modified clinoptilolite;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the chloride ion content of 586mg/kg and 10 parts of modified clinoptilolite by weight to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 175 ℃ for half an hour, drying at 120 ℃ for one hour, and finally drying at 58 ℃ to constant weight.
Example 4:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 57 parts by weight of water and 9 parts by weight of modified starch, and stirring to obtain a mixed solution; roasting clinoptilolite at 350 ℃ for 1.5h to obtain modified clinoptilolite;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the chloride ion content of 672mg/kg and 1 part of modified clinoptilolite by weight, and calcining at 130 ℃ for 1.5 hours to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
Example 5:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 67 parts by weight of water and 9 parts by weight of modified starch, and stirring to obtain a mixed solution; roasting clinoptilolite at 360 ℃ for 1.5h to obtain modified clinoptilolite;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the water-soluble magnesium oxide content of 2 wt.% and 1 part of modified clinoptilolite, and calcining at 130 ℃ for 1.5 hours to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
Example 6:
the gypsum plasterboard prepared in this example was prepared as follows:
step 1: mixing 55 parts by weight of water and 6 parts by weight of modified starch, and stirring to obtain a mixed solution; roasting clinoptilolite at 300 ℃ for 2h to obtain modified clinoptilolite;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the water-soluble sodium oxide content of 0.2 wt.% and 1 part of modified clinoptilolite, and calcining at 130 ℃ for 1.5 hours to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
Comparative example 1:
the difference from the examples is that no zeolite is added, and the preparation steps are as follows:
step 1: mixing 55 parts by weight of water and 0.5 part by weight of modified starch, and stirring to obtain a mixed solution;
step 2: calcining 100 parts of desulfurized gypsum raw material with the chloride ion content of 672mg/kg for 1.5h at 130 ℃ to prepare gypsum clinker;
and step 3: uniformly mixing the mixed solution prepared in the step (1) and the gypsum clinker prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
Comparative example 2:
the difference from the example is that the zeolite is replaced by diatomite, and the preparation steps are as follows:
step 1: mixing 57 parts by weight of water and 9 parts by weight of modified starch, and stirring to obtain a mixed solution;
step 2: uniformly mixing 100 parts of desulfurized gypsum raw material with the chloride ion content of 672mg/kg and 1 part of diatomite by weight, and calcining at 120 ℃ for 1.5 hours to prepare a mixture;
and step 3: uniformly mixing the mixed solution prepared in the step (1) with the mixed solution prepared in the step (2) to obtain gypsum slurry, and lapping, bonding and molding the gypsum slurry and the protective paper to obtain a wet plate;
and 4, step 4: and (3) conveying the formed plate to a drying kiln, drying at 160 ℃ for half an hour, drying at 110 ℃ for one hour, and finally drying at 45 ℃ to constant weight.
The diatomite and the zeolite have the same characteristics of large porosity, strong adsorption performance and the like, the diameter of the diatomite pore is about 7-125 nm, the diameter of the zeolite pore can be increased from 0.4-0 and 6nm to 0.8nm after modification, the pore of the zeolite can block the entrance of large-diameter molecules or ions, the selective exchange and adsorption performance can be realized, the selective adsorption can avoid the macromolecules from occupying the pore channel, and the ion adsorption utilization rate of the mineral material can be reduced; meanwhile, after impurities in the pore channels of the zeolite are removed in the modification step of the zeolite, the ion adsorption rate of the zeolite can be further improved.
Test example 1:
the flexural strength and compressive strength data compared to the comparative examples are shown in the following table, according to GBT 17669.4-1999 Standard "measurement of physical Properties of clean building Gypsum slurries".
Table 1: flexural and compressive strength test results
| Categories | Flexural strength (MPa) | Compressive strength (MPa) |
| Comparative example 1 | 6.30 | 19.6 |
| Comparative example 2 | 6.10 | 17.108 |
| Example 1 | 8.3 | 22.1 |
| Example 2 | 8.5 | 22.5 |
| Example 3 | 7.9 | 21.2 |
| Example 4 | 7.5 | 21.5 |
| Example 5 | 8.0 | 21.9 |
| Example 6 | 7.8 | 21.7 |
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. Examples 1, 2, 3, 4, 5 and 6 are superior in performance to comparative examples 1 and 2. The zeolite is proved to have obvious improvement effect on the flexural strength and the compressive strength of the gypsum test block.
Test example 2:
the invention tests the breaking load of the sample after being damped, and the damping test condition of the gypsum board refers to the damping deflection test condition of the gypsum board: the temperature is 32 +/-2 ℃, and the humidity is 90 +/-3%. The improvement in breaking load after exposure to moisture on the gypsum board is shown in the table below.
Table 2: comparison table/N of breaking load after being affected with damp
From the conclusion of test example 2, it can be seen that the gypsum plasterboards prepared according to examples 1, 2, 3, 4, 5 and 6 of the present application using desulfurized gypsum with high impurity ion content, the boards doped with modified natural zeolite, have significantly better fracture properties after being wetted than the gypsum boards not doped with zeolite. The zeolite provides a significant improvement over diatomaceous earth in the breaking load of plasterboard after exposure to moisture, compared to comparative example 2.
Test example 3:
the invention determines the change of the bonding effect of the gypsum board by testing the dry-wet bonding of the gypsum board: 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 test of dry bonding is carried out by a cross knife method, and the test of wet bonding of the invention is carried out according to a method for detecting bonding performance of gypsum boards of North New construction 28095and boards of State factory SGZJ013-2014, a small board with the size of about 160 multiplied by 40mm is cut out, the small board is put into a constant temperature water bath box with the temperature of 98 +/-2 ℃, the time is counted, and the small board is taken out after 12 minutes. Cutting the board from the middle of the length direction, pulling up the two-side protective paper along the cutting part, observing the combination state of the protective paper and the gypsum core at the pulling-up part, and judging according to the judgment standard.
By testing, the following experimental conclusions were made:
table 3: results of adhesion Performance test
| Categories | Dry bonding | Wet heat bonding |
| Example 1 | A | A |
| Example 2 | A | A |
| Example 3 | A | A |
| Example 4 | A | A |
| Example 5 | A | A |
| Example 6 | A | A |
| Comparative example 1 | A | E |
| Comparative example 2 | A | D |
The performance index detection in the present application is based on national and industry standards. As can be seen from Table 3, the paper-faced gypsum boards prepared in examples 1, 2, 3, 4, 5 and 6 of the present application have better bonding effect under humid and hot, high humidity environment conditions than those of comparative examples 1 and 2, and the paper-faced gypsum boards prepared by the technical measures of the present invention improve the poor bonding effect of the paper-faced gypsum boards prepared by using high impurity ion desulfurized gypsum as a raw material.
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. A gypsum plasterboard, wherein the gypsum plasterboard comprises a core and a cover paper outside the core, the core comprising the following raw materials: 100 parts of desulfurized gypsum, 0.5-10 parts of modified starch, 50-70 parts of water and 1-10 parts of modified natural zeolite;
the desulfurized gypsum is selected from one or more of high-chlorine desulfurized gypsum, high-magnesium desulfurized gypsum and high-sodium desulfurized gypsum.
2. The gypsum plasterboard of claim 1, wherein the chloride ion content in the high-chlorine desulfurized gypsum is 500-1000 mg/kg;
the high-magnesium desulfurized gypsum is desulfurized gypsum with the content of water-soluble magnesium oxide marked as x, and the content of the water-soluble magnesium oxide in the desulfurized gypsum is more than 0.2 wt.% and less than or equal to x and less than or equal to 2.5 wt.%;
the high-sodium desulfurized gypsum is desulfurized gypsum with the content of water-soluble sodium oxide recorded as y, and the content of the water-soluble sodium oxide in the desulfurized gypsum is more than 0.08 wt.% and less than or equal to y and less than or equal to 0.25 wt.%.
3. The gypsum plasterboard of claim 1 or 2, wherein the modified starch has a particle size of 80-150 mesh.
4. A paper-faced gypsum board as claimed in claim 1 or 2, wherein the modified natural zeolite is a high temperature calcined natural zeolite.
5. The gypsum plasterboard of claim 4, wherein the high-temperature calcination is carried out at a calcination temperature of 200 ℃ and 600 ℃ for a calcination time of 1-2 h.
6. The gypsum plasterboard of claim 4, wherein the particle size of the natural zeolite is 80-400 mesh, preferably 200-325 mesh; the natural zeolite is selected from one or more of analcime, mordenite and clinoptilolite;
the pore diameter of the modified natural zeolite is 0.4-0.8 nm.
7. A method of making the paper-faced gypsum board of any one of claims 1 to 6, wherein the method of making comprises the steps of:
(1) uniformly mixing water and modified starch to prepare a mixed solution;
(2) uniformly mixing desulfurized gypsum and modified natural zeolite, and calcining to obtain a mixture of calcined gypsum and modified natural zeolite;
(3) uniformly mixing the mixed solution and the mixture to prepare gypsum slurry;
(4) lapping and firmly adhering the gypsum slurry and the face protective paper for forming to prepare a wet plate;
(5) 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 gypsum plasterboard according to claim 7, wherein the calcination temperature in step (2) is 110-270 ℃ and the calcination time is 1-3 h.
9. The method of making a paper-faced gypsum board according to claim 7, wherein the drying in step (5) includes more than two drying stages with decreasing drying temperatures.
10. The method for preparing gypsum plasterboard according to claim 7, wherein the drying in step (5) has three stages, the drying time in the first stage is 0.1-1h, and the drying temperature is 140-165 ℃; the drying time of the second stage is 0.1-2h, the drying temperature is 80-120 ℃, the drying temperature of the third stage is 40-60 ℃, and the drying is carried out until the weight is constant.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910382628.5A CN111606666A (en) | 2019-05-08 | 2019-05-08 | Paper-surface gypsum board and preparation method thereof |
| PCT/CN2019/103401 WO2020224120A1 (en) | 2019-05-08 | 2019-08-29 | High impurity ion content desulfurized gypsum paper-faced gypsum board and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910382628.5A CN111606666A (en) | 2019-05-08 | 2019-05-08 | Paper-surface gypsum board and preparation method thereof |
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| CN113698163A (en) * | 2021-07-27 | 2021-11-26 | 北新集团建材股份有限公司 | Paper-surface gypsum board and preparation method thereof |
| US20220324756A1 (en) * | 2021-04-07 | 2022-10-13 | Knauf Gips Kg | Methods of removing chloride from gypsum having high level of chloride salt |
| CN115368098A (en) * | 2022-08-22 | 2022-11-22 | 武汉理工大学 | Industrial byproduct gypsum product coated with carbon mineralized coating and preparation method thereof |
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| CN115368098A (en) * | 2022-08-22 | 2022-11-22 | 武汉理工大学 | Industrial byproduct gypsum product coated with carbon mineralized coating and preparation method thereof |
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