CN111606661A - High-chlorine desulfurized gypsum plasterboard and method for improving bonding grade by activating zeolite - Google Patents
High-chlorine desulfurized gypsum plasterboard and method for improving bonding grade by activating zeolite Download PDFInfo
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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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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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Abstract
The invention provides a high-chlorine desulfurized gypsum plasterboard and a method for improving bonding grade by activated zeolite, wherein the plasterboard comprises the following raw materials in parts by mass: 100 parts of desulfurized gypsum clinker, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch; the preparation method comprises pretreating zeolite, and activating; mixing the desulfurized gypsum clinker and the glass fiber to prepare a mixture; weighing water, a retarder, starch and treated zeolite to prepare a mixed solution; uniformly mixing the mixture and the mixed solution to prepare gypsum slurry; and (3) forming, solidifying, drying, combining, edge sawing, edge sealing and packaging the gypsum slurry to obtain the gypsum plaster board. The gypsum plaster board solves the technical problem that the gypsum plaster board prepared by using the high-chlorine desulfurized gypsum clinker as a raw material has poor dehydration performance and bonding performance, and the core and the protective paper are not peeled off under harsh test conditions, so that the bonding effect is good.
Description
Technical Field
This document relates to paper-faced gypsum board, and more particularly to high chlorine desulfurized gypsum paper-faced gypsum board and a method for increasing the bonding grade by activating zeolite.
Background
The desulfurized gypsum is a product of flue gas desulfurization of a coal-fired power plant, and along with the popularization of a flue gas desulfurization project of the coal-fired power plant, the annual yield of the desulfurized gypsum in China is incredible. The desulfurized gypsum is widely used in industries such as building materials and the like, promotes the further development of national environmental protection circular economy, greatly reduces the exploitation amount of natural gypsum and protects resources. If the desulfurization gypsum can not be effectively treated and applied, not only is the resource waste, but also the secondary pollution is caused to the environment.
At present, the technology for preparing the paper-surface gypsum board by utilizing the desulfurized gypsum is mature, but the quality of the paper-surface gypsum board is still influenced due to unstable gypsum quality. From chemical composition analysis, the desulfurized gypsum is mainly composed of CaO and SO3And also includes Na2O，K2O，MgO，Cl-And the like. Cl-With Ca2+And Mg2+A stable substance containing crystal water is formed, so that the desulfurized gypsum is not easy to dehydrate, and the calcining temperature and the calcining quality of the desulfurized gypsum are influenced; meanwhile, the high content of chloride ions can reduce the bonding performance of the protective paper and the board core in a humid environment, and the application of the gypsum board is influenced. Therefore, the production enterprises of the gypsum plasterboard strictly limit the content of chloride ions in the desulfurized gypsum entering the factory, and the use of the exceeding desulfurized gypsum is limited. The application provides a method for improving the bonding performance of gypsum plasterboard prepared from high-chloride-ion-content desulfurized gypsum.
Disclosure of Invention
The application provides a high-chlorine desulfurized gypsum plasterboard and a method for improving the bonding grade by activated zeolite, which can use desulfurized gypsum with high chloride ion content as a raw material of the plasterboard, and solve the technical problems of poor dehydration property and poor bonding property of the plasterboard prepared by using the high-chlorine desulfurized gypsum as a raw material.
The application provides high chloride ion content desulfurized gypsum is the thistle board of raw materials, thistle board includes the mask paper in board core and the board core outside, the raw materials of board core include following component: 100 parts of desulfurized gypsum clinker and 0.5-10 parts of zeolite;
according to JC/T2074 plus 2011 flue gas desulfurization gypsum, the desulfurization gypsum meets the technical requirement regulation of more than three levels of desulfurization gypsum: the content of chloride ions is less than or equal to 400 mg/kg. The content of chloride ions in the desulfurization gypsum raw materials entering a factory is limited to be less than or equal to 300mg/kg by common paper-faced gypsum board production enterprises so as to ensure the performance of the paper-faced gypsum board. In the paper-faced gypsum board provided by the invention, the desulfurized gypsum clinker is desulfurized gypsum clinker with high chloride ion content, and the chloride ion content is as follows: 500-8000 mg/kg;
in the gypsum plaster board provided by the invention, the zeolite is modified zeolite, and the specific surface area of the modified zeolite is 500-1000m2G, pore diameter of 0.40nm-0.80 nm. The internal pores of the unmodified zeolite can be occupied by organic matters or other inorganic impurities, so that the pore channels can not be completely opened, and the adsorption and solidification on chloride ions are not obvious.
In the paper-surface gypsum board provided by the invention, the raw materials of the board core comprise the following components: 100 parts of desulfurized gypsum clinker, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
In the paper-surface gypsum board provided by the invention, the starch is modified starch; the modified starch is selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch. The modified starch has the following moisture content: 12 wt.% or less; pH value: 5-8; alkaline fluidity: 14-20 s.
In the paper-surface gypsum board provided by the invention, the specific surface area of the desulfurized gypsum clinker is 3500-4000cm2/g。
In the paper-surface gypsum board provided by the invention, the glass fiber is selected from any one of medium alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber.
In the paper-surface gypsum board provided by the invention, the length of the glass fiber is 9-15mm, and the diameter of the fiber monofilament is 10-15 μm.
In the gypsum plaster board provided by the invention, the retarder is selected from one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, lignosulfonate, sodium carboxymethyl cellulose, hydroxyethyl cellulose, phosphoric acid and protein retarder.
In the paper-surface gypsum board provided by the invention, the protein retarder is selected from a bone glue protein retarder and a protein gypsum retarder formed by calcium-calcified degraded polyamide.
On the other hand, the invention also provides a preparation method of the paper-surface gypsum board, which comprises the following steps:
(1) pre-treating the zeolite, activating it: roasting zeolite to remove organic matters, cooling to room temperature, leaching with water, and drying to constant weight;
(2) weighing desulfurized gypsum clinker, glass fiber and pretreated zeolite, mechanically stirring, and uniformly mixing to obtain a mixture;
(3) weighing water, a retarder and starch, and uniformly mixing to obtain a mixed solution;
(4) adding the premix prepared in the step (2) into the mixed solution obtained in the step (3) to prepare gypsum slurry;
(5) lapping and firmly adhering the uniformly stirred gypsum slurry and the mask paper for forming to obtain a wet plate;
(6) and (4) after the wet board is solidified, feeding the solidified wet board into a dryer, and drying the wet board to obtain the paper-surface gypsum board.
In the preparation method of the gypsum plaster board provided by the invention, the roasting temperature of the zeolite in the step (1) is 200-400 ℃, the roasting time is 1.5-3h, and after organic matters are removed, the gypsum plaster board is cooled to room temperature; the drying temperature is 45-60 ℃, and the mixture is dried in vacuum to constant weight. In addition, the zeolite is rinsed 10 times with deionized water, and the volume of the deionized water is not less than 10 times of the volume of the zeolite.
In the preparation method of the paper-surface gypsum board provided by the invention, the gypsum slurry in the step (5) is thrown onto the lower protective paper on the forming table under the action of centrifugal force, the gypsum slurry is extruded by the forming knife under the driving of the traction force of the solidification belt, so that the lower protective paper is folded into a right angle along the roller mark, the lower protective paper and the slurry are overlapped with the upper protective paper under the extrusion of the forming plate and are firmly bonded to form a wet board, and then the wet board is led out under the traction of the solidification belt to finish the forming;
in the method for preparing the paper-surface gypsum board, the drying in the step (6) is more than two drying stages with the drying temperature decreasing.
In the preparation method of the paper-surface gypsum board, the drying in the step (6) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 150-; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 100-; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.
In the preparation method of the paper-surface gypsum board provided by the invention, the dried wet board is further subjected to sheet combination, edge sawing, edge sealing and packaging to form a paper-surface gypsum board product.
The invention provides a method for improving the bonding effect of a paper-surface gypsum board. The zeolite is a natural porous mineral, pores are developed, a large number of pores and cavities are formed in the crystal, the specific surface area is large, the high adsorption performance is shown, after activation, the pores are opened, chloride ions can be adsorbed, the influence of moisture absorption and crystallization of water-soluble salt on the bonding capacity of the facing paper and the board core in a humid environment is reduced, and the application of the gypsum board is influenced.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and methods described in the specification and claims.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the embodiment of the invention, the paper-surface gypsum board comprises a board core and a protective paper on the outer side of the board core, wherein the board core comprises the following raw materials: 100 parts of desulfurized gypsum clinker and 0.5-10 parts of zeolite;
according to JC/T2074 plus 2011 flue gas desulfurization gypsum, the desulfurization gypsum meets the technical requirement regulation of more than three levels of desulfurization gypsum: the content of chloride ions is less than or equal to 400 mg/kg. The content of chloride ions in the desulfurization gypsum raw materials entering a factory is limited to be less than or equal to 300mg/kg by common paper-faced gypsum board production enterprises so as to ensure the performance of the paper-faced gypsum board.
In the embodiment of the invention, the desulfurized gypsum clinker is desulfurized gypsum clinker with high chloride ion content, and the chloride ion content is as follows: 500-8000 mg/kg;
in the embodiment of the invention, the zeolite is modified zeolite, and the specific surface area of the modified zeolite is 500-1000m2G, pore diameter of 0.40nm-0.80 nm. The internal pores of the unmodified zeolite can be occupied by organic matters or other inorganic impurities, so that the pore channels can not be completely opened, and the adsorption and solidification on chloride ions are not obvious.
In the embodiment of the invention, the raw materials of the plate core comprise the following components: 100 parts of desulfurized gypsum clinker, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
In an embodiment of the invention, the starch is a modified starch; the modified starch is selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch. The modified starch has the following moisture content: 12 wt.% or less; pH value: 5-8; alkaline fluidity: 14-20 s.
In the embodiment of the invention, the specific surface area of the desulfurized gypsum clinker is 3500-4000cm2/g。
In the embodiment of the present invention, the glass fiber is selected from any one of medium alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber.
In the embodiment of the invention, the length of the glass fiber is 9-15mm, and the monofilament diameter of the fiber is 10-15 μm.
In an embodiment of the invention, the retarder is selected from one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, lignosulfonate, sodium carboxymethylcellulose, hydroxyethylcellulose, phosphoric acid and protein-based retarder.
In the embodiment of the invention, the protein retarder is selected from a bone glue protein retarder and a protein gypsum retarder formed by calcium-calcified degraded polyamide.
In the embodiment of the invention, the used desulfurized gypsum clinker is prepared from the desulfurized gypsum of solid wastes generated by flue gas desulfurization in a power plant; zeolite was produced by State invested flourishing Inc.; glass fibers were purchased from mineral products limited, Jinghang, Hebei. The modified starch is purchased from Jinan Yuan chemical Co., Ltd; protein gypsum retarders, which are made by calcium-salting degraded polyamides, are available from shanghai and chemical ltd. The bone glue protein retarder was purchased from Linyi Black horse Gypsum building materials Co.
Example 1
The content of chloride ions in the desulfurized gypsum clinker serving as the raw material of the paper-faced gypsum board prepared in the example is 1389 mg/kg.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
step one, pretreating zeolite and activating the zeolite, wherein the method comprises the following steps: roasting the zeolite for 2 hours at 300 ℃ in a muffle furnace, removing organic matters, and cooling to room temperature; and leaching the zeolite with deionized water for 10 times, wherein the volume of the deionized water is not less than 10 times of that of the zeolite, and drying the zeolite at 45 ℃ in vacuum to constant weight.
Step two, weighing 100 parts by weight of desulfurized gypsum clinker and 0.06 part by weight of medium alkali glass fiber (the length of the glass fiber is 9mm, and the diameter of a fiber monofilament is 10 mu m), mechanically stirring and uniformly mixing to obtain a mixture.
Step three, weighing 60 parts by weight of water, 1.2 parts by weight of pretreated zeolite, 0.8 part by weight of protein gypsum retarder formed by calcifying degraded polyamide and 0.3 part by weight of modified corn starch, and uniformly mixing to obtain a mixed solution.
And step four, adding the prepared mixture into the prepared mixed solution to prepare gypsum slurry.
And fifthly, throwing the uniformly stirred gypsum slurry onto the lower protective paper on the forming table under the action of centrifugal force, extruding the slurry by a forming cutter under the driving of traction force of a solidification belt, folding the lower protective paper into a right angle along the roller mark, overlapping the lower protective paper and the slurry with the upper protective paper under the extrusion of the forming plate, firmly bonding to form a wet plate, and then leading out the wet plate under the traction of the solidification belt to finish forming.
And step six, solidifying the wet plate on a conveying belt, cutting off the wet plate, and then entering a dryer to perform three drying stages. The drying time of the first drying stage is 0.6h, and the drying temperature is 180 ℃; the drying time of the second drying stage is 1h, and the drying temperature is 110 ℃; the drying time of the third drying stage was 24h and the drying temperature was 45 ℃.
Step seven: and (4) combining the dried boards, sawing edges, sealing edges and packaging to form the gypsum plaster board.
Example 2
The content of chloride ions in the desulfurized gypsum clinker of the raw material of the paper-faced gypsum board produced in this example was 1564 mg/kg.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
step one, pretreating zeolite and activating the zeolite, wherein the method comprises the following steps: roasting the zeolite for 2 hours at 300 ℃ in a muffle furnace, removing organic matters, and cooling to room temperature; and leaching the zeolite with deionized water for 10 times, wherein the volume of the deionized water is not less than 10 times of that of the zeolite, and drying the zeolite at 45 ℃ in vacuum to constant weight.
Step two, weighing 100 parts by weight of desulfurized gypsum clinker and 0.18 part by weight of alkali-free glass fiber (the length of the glass fiber is 15mm, and the diameter of a fiber monofilament is 15 mu m), mechanically stirring and uniformly mixing to obtain a mixture.
Step three, weighing 65 parts by weight of water, 4.2 parts by weight of pretreated zeolite, 0.5 part by weight of bone glue protein retarder and 0.5 part by weight of modified corn starch, and uniformly mixing to obtain a mixed solution.
Steps four to seven are the same as in example 1.
Example 3
The content of chloride ions in the desulfurized gypsum clinker serving as the raw material of the paper-faced gypsum board prepared in the example is 4820 mg/kg.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
step one, pretreating zeolite and activating the zeolite, wherein the method comprises the following steps: roasting the zeolite for 2 hours at 300 ℃ in a muffle furnace, removing organic matters, and cooling to room temperature; and leaching the zeolite with deionized water for 10 times, wherein the volume of the deionized water is not less than 10 times of that of the zeolite, and drying the zeolite at 45 ℃ in vacuum to constant weight.
Step two, weighing 100 parts by weight of desulfurized gypsum clinker and 0.1 part by weight of alkali-resistant glass fiber (the length of the glass fiber is 12mm, and the diameter of a fiber monofilament is 12 microns), mechanically stirring and uniformly mixing to obtain a mixture.
Step three, weighing 72 parts of water, 6.8 parts of pretreated zeolite, 0.26 part of bone glue protein retarder and 0.9 part of modified corn starch, and uniformly mixing to obtain a mixed solution.
Steps four to seven are the same as in example 1.
Example 4
The content of chloride ions in the desulfurized gypsum clinker serving as the raw material of the paper-faced gypsum board prepared by the embodiment is 6820 mg/kg.
The method for preparing the paper-surface gypsum board comprises the following specific steps:
step one, pretreating zeolite and activating the zeolite, wherein the method comprises the following steps: roasting the zeolite for 2 hours at 300 ℃ in a muffle furnace, removing organic matters, and cooling to room temperature; and leaching the zeolite with deionized water for 10 times, wherein the volume of the deionized water is not less than 10 times of that of the zeolite, and drying the zeolite at 45 ℃ in vacuum to constant weight.
Step two, weighing 100 parts by weight of desulfurized gypsum clinker and 0.2 part by weight of medium alkali glass fiber (the length of the glass fiber is 10mm, and the diameter of a fiber monofilament is 10 mu m), mechanically stirring and uniformly mixing.
Step three, weighing 68 parts by weight of water, 9.7 parts by weight of pretreated zeolite, 0.26 part by weight of protein gypsum retarder formed by calcifying degraded polyamide and 0.9 part by weight of modified corn starch, and uniformly mixing.
Steps four to seven are the same as in example 1.
Comparative example 1
Comparative example 1 differs from the paper-faced gypsum board of example 1 only in that comparative example 1 does not have zeolite added, the remaining components are the same as in example 1, and the procedure for making the paper-faced gypsum board is also the same as in example 1.
Comparative example 2
Comparative example 2 is a paper-faced gypsum board of example 2, except that comparative example 2 is added with unmodified zeolite, the remaining components are the same as in example 2, and the procedure for making the paper-faced gypsum board is the same as in example 2.
Comparative example 3
The gypsum plasterboard of comparative example 3 differs from that of example 3 only in that the zeolite is not added in comparative example 3, fly ash is added in the same amount by weight as the zeolite, the remaining components are the same as those in example 3, and the procedure for producing the gypsum plasterboard is also the same as that in example 3.
Comparative example 4
The gypsum plasterboard of comparative example 4 is different from that of example 4 only in that the zeolite is not added in comparative example 4, the diatomaceous earth is added in the same weight part as the zeolite, the rest components are the same as those in example 4, and the procedure for producing the gypsum plasterboard is also the same as that in example 4.
Comparative example 5
Common paper-faced gypsum board is commercially available.
Test example 1
The gypsum plasterboards of the examples and the comparative examples are tested according to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the physical and mechanical properties of the gypsum plasterboards are detected, and the results are shown in Table 1.
TABLE 1 thistle board Performance test results
As can be seen from Table 1, the gypsum plasterboard prepared in the embodiment of the present application can meet the physical and mechanical properties required by the building material industry standard in terms of performance. The experimental raw materials, the proportions and the preparation steps of comparative examples 1, 2, 3 and 4 are respectively the same as those of examples 1, 2, 3 and 4, and the performances are similar to those of examples 1, 2, 3 and 4, which shows that the addition of zeolite does not reduce the mechanical properties of the gypsum plasterboard.
Test example 2
The adhesive property is divided into 5 grades, A grade: the paper boards are firmly bonded and are not separated after being lifted; b stage: a small part is separated, and a large part is intact; c level: half of the adhesive is firmly adhered, and the other half of the adhesive is separated; d stage: most of the materials are separated, and only a small part of the materials are firmly adhered; e, grade: the cardboard is totally separated.
The gypsum plasterboard of the examples and the comparative examples is tested by referring to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the dry bonding performance of the gypsum plasterboard is detected.
The wet and hot bonding performance test method comprises the following steps: and (3) performing hot steam curing on the prepared gypsum plaster board in a water bath kettle at 100 ℃ for 12 minutes, testing the bonding property of the gypsum plaster board by adopting a method of drawing an equilateral triangle, and finishing the test within 1 minute.
And (3) testing in a high-humidity environment: the prepared gypsum board is maintained under the high humidity condition (the temperature is 23 +/-2 ℃, and the relative humidity is 90 +/-3), and after the gypsum board reaches the specified age of 1 week, the bonding performance of the gypsum board is tested by adopting a method of drawing an equilateral triangle.
TABLE 2 paper-surface plasterboard bond property test results
| Dry bonding | Wet heat bonding | High wet adhesion | |
| Example 1 | A | A | A |
| Example 2 | A | B | A |
| Example 3 | A | B | A |
| Example 4 | A | A | A |
| Comparative example 1 | B | E | E |
| Comparative example 2 | C | E | E |
| Comparative example 3 | D | E | E |
| Comparative example 4 | E | E | E |
| Comparative example 5 | A | E | D |
The performance index detection in the present application is based on national and industry standards. Table 2 shows that the paper-faced gypsum boards prepared in examples 1, 2, 3 and 4 of the present application have better bonding effect under humid and hot environment and high humidity environment than those prepared in comparative examples 1, 2, 3, 4 and 5.
Test example 3
The gypsum plasterboards of the examples and the comparative examples are tested by referring to the Chinese national standard GB/T9775-2008 'gypsum plasterboard', and the damp deflection of the gypsum plasterboards is detected. In the national standard, a test method of the paper-surface gypsum board is standardized, but no clear standard quantity value is provided for the qualified range of the damp deflection.
TABLE 3 moisture deflection test results for paper-surface plasterboard
| Deflection under damp, mm. (32. + -. 2) DEG C, (90. + -.3)% | |
| Example 1 | 1.2 |
| Example 2 | 1.5 |
| Example 3 | 1.6 |
| Example 4 | 1.3 |
| Comparative example 1 | 3.2 |
| Comparative example 2 | 3.0 |
| Comparative example 3 | 4.6 |
| Comparative example 4 | 4.1 |
| Comparative example 5 | 4.2 |
From the conclusion of test example 3, it can be seen that the damp flexibility of the gypsum plasterboard prepared by using the desulfurized gypsum with high chloride ion content in examples 1, 2, 3 and 4 of the present application is reduced by more than 50% compared with the damp flexibility of the gypsum plasterboard prepared by using comparative example 1 and comparative example 2, wherein zeolite is not added at all or unmodified zeolite is added. Comparative example 2 after the unmodified zeolite is added, the flexibility value is reduced by 28.5 percent compared with that of comparative example 5, which shows that the flexibility of the gypsum board with paper surface is reduced by the zeolite, and the effect of the modified zeolite is better. In addition, comparative example 3 and comparative example 4 show that the moisture deflection of the gypsum plasterboard is not improved by adding the fly ash and the diatomite. 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. High chloride ion content desulfurization gypsum thistle board, wherein, thistle board includes the mask paper in board core and the board core outside, the raw materials of board core include following component: 100 parts of desulfurized gypsum clinker and 0.5-10 parts of zeolite;
the desulfurized gypsum clinker is a desulfurized gypsum clinker with high chloride ion content, and the chloride ion content in the desulfurized gypsum clinker is as follows: 500-8000 mg/kg;
the zeolite is modified zeolite, and the specific surface area of the modified zeolite is 500-1000m2G, pore diameter of 0.40nm-0.80 nm.
2. The high chloride ion content desulfurized gypsum paper-faced gypsum board of claim 1 wherein the raw materials for said core comprise the following components: 100 parts of desulfurized gypsum clinker, 60-75 parts of water, 0.5-10 parts of zeolite, 0.05-0.2 part of glass fiber, 0.2-1 part of retarder and 0.2-1 part of starch.
3. The high chloride content desulfurized gypsum plasterboard of claim 2 wherein the starch is a modified starch; the modified starch is selected from one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch.
4. The high chloride ion content desulfurized gypsum thistle board of claim 1 or 2 wherein the specific surface area of said desulfurized gypsum clinker is 3500-4000cm2/g。
5. The high chloride ion content desulfurized gypsum plasterboard of claim 2, wherein the glass fibers are selected from any one of medium alkali glass fibers, alkali-free glass fibers and alkali-resistant glass fibers;
the length of the glass fiber is 9-15mm, and the diameter of the fiber monofilament is 10-15 μm.
6. The high chloride content desulfurized gypsum thistle board of claim 2, 3 or 5 wherein the set retarder is selected from one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, lignosulfonate, sodium carboxymethylcellulose, hydroxyethylcellulose, phosphoric acid, and protein-based set retarders.
7. The high chloride content desulfurized gypsum paper-faced gypsum board of claim 6 wherein said protein-based retarder is selected from the group consisting of a bone collagen protein retarder and a protein-based gypsum retarder formed by calcium-calcified degraded polyamide.
8. A method of making a high chloride ion content desulfurized gypsum plasterboard according to any one of claims 2 to 7, comprising the steps of:
(1) pre-treating the zeolite, activating it: roasting zeolite to remove organic matters, cooling to room temperature, leaching with water, and drying to constant weight;
(2) weighing desulfurized gypsum clinker and glass fiber, mechanically stirring and uniformly mixing to prepare a mixture;
(3) weighing water, a retarder, pretreated zeolite and starch, and uniformly mixing to obtain a mixed solution;
(4) adding the premix prepared in the step (2) into the mixed solution obtained in the step (3) to prepare gypsum slurry;
(5) lapping and firmly adhering the uniformly stirred gypsum slurry and the mask paper for forming to obtain a wet plate;
(6) 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.
9. The method for preparing the desulfurized gypsum plasterboard with high chloride ion content according to claim 8, wherein the zeolite roasting temperature in step (1) is 200-400 ℃, the roasting time is 1.5-3h, and the drying temperature is 45-60 ℃;
the drying in the step (6) is more than two drying stages with the drying temperature decreasing.
10. The method for preparing a desulfurized gypsum plasterboard with high chloride ion content according to claim 8 or 9, wherein the drying in step (6) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 150 ℃ to 200 ℃; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 100-; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.
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| CN201910379300.8A CN111606661A (en) | 2019-05-08 | 2019-05-08 | High-chlorine desulfurized gypsum plasterboard and method for improving bonding grade by activating zeolite |
| 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 |
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| CN201910379300.8A CN111606661A (en) | 2019-05-08 | 2019-05-08 | High-chlorine desulfurized gypsum plasterboard and method for improving bonding grade by activating zeolite |
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| CN113979665A (en) * | 2021-11-29 | 2022-01-28 | 武汉理工大学 | Functional additive for treating high-chloride-ion-content desulfurized gypsum, and preparation method and application thereof |
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