CN111548059A - Paper-surface gypsum board, preparation method thereof and desulfurization gypsum pretreatment method - Google Patents
Paper-surface gypsum board, preparation method thereof and desulfurization gypsum pretreatment method Download PDFInfo
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- CN111548059A CN111548059A CN202010365858.3A CN202010365858A CN111548059A CN 111548059 A CN111548059 A CN 111548059A CN 202010365858 A CN202010365858 A CN 202010365858A CN 111548059 A CN111548059 A CN 111548059A
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- gypsum
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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
- 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
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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
- 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
A paper-surface gypsum board, a preparation method thereof and a desulfurization gypsum pretreatment method. The paper-surface gypsum board comprises the following raw materials: desulfurized gypsum clinker, polyphosphate, cationic surfactant, nonionic surfactant, binder and water. The preparation method comprises the steps of uniformly mixing the desulfurized gypsum clinker, the polyphosphate and the binder to obtain a mixture; uniformly mixing the cationic surfactant, the nonionic surfactant and the water to obtain a compounded surfactant solution; uniformly mixing the mixture with the compounded surfactant solution to obtain slurry; and attaching protective paper to the upper surface and the lower surface of the slurry, forming and drying to obtain the paper-surface gypsum board. The paper-faced gypsum board has good mechanical property, the protective paper has good bonding property with gypsum, and the content of water-soluble MgO in the core material and the content of water-soluble chloride ions in the interlayer of the core material are low.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a paper-surface gypsum board, a preparation method thereof and a desulfurization gypsum pretreatment method.
Background
The flue gas desulfurization gypsum is an industrial byproduct generated by wet desulfurization for a coal-fired power plant, has the same main component as natural gypsum, can be dried, calcined and ground to obtain building gypsum, and is widely applied to the production of building material products such as gypsum boards, gypsum blocks and the like due to relatively low price. However, the desulfurized gypsum contains various water-soluble impurity ions, such as magnesium ions, chloride ions and the like. The existence of the impurity ions easily causes the quality problems of the prepared gypsum product, such as blooming, sagging, yellowing, reduced strength, poor bonding of the protective paper and the gypsum board core, and the like. At present, the quality of a plurality of desulfurized gypsum can not meet the production requirement of gypsum products. It has been reported in the literature that cement can be used to set water-soluble impurity ions, but in the case of gypsum plasterboard, hydration of the incorporated cement raises the pH of the gypsum slurry, affecting the bonding of the facing paper to the board core.
Disclosure of Invention
The application provides a paper-surface gypsum board, a preparation method thereof and a desulfurization gypsum pretreatment method, the paper-surface gypsum board has good mechanical property, the bonding property between the protective paper and the gypsum is good, the content of water-soluble MgO in the core material and the content of water-soluble chloride ions in the interlayer of the core material are low, and the desulfurization gypsum pretreatment method can effectively reduce the content of water-soluble MgO and chloride ions in the desulfurization gypsum.
In a first aspect, the present application provides a paper-faced gypsum board, the raw materials of which include: desulfurized gypsum clinker, polyphosphate, cationic surfactant, nonionic surfactant, binder and water.
In embodiments herein, the polyphosphate may be selected from any one or more of chain polyphosphates, cyclic metaphosphates, and ultraphosphates.
Optionally, the polyphosphate is selected from any one or more of tripolyphosphate, tetrapolyphosphate, hexametaphosphate, trimetaphosphate and tetrametaphosphate.
In an embodiment of the present application, the cationic surfactant may be selected from any one or more of long chain quaternary ammonium salts, wherein the number of carbon atoms of the long chain is twelve, fourteen, sixteen and eighteen, and the number of the long chain is one.
Optionally, the cationic surfactant is selected from any one or more of dodecyl dimethyl benzyl ammonium chloride, tetradecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and octadecyl trimethyl ammonium chloride.
In the embodiments of the present application, the nonionic surfactant may be selected from any one or more of span-based nonionic surfactants and polyoxyethylene-type nonionic surfactants.
Optionally, the Span-type nonionic surfactants include Span-20 and Span-40, and the polyoxyethylene-type nonionic surfactants include alkylphenol ethoxylates, polyoxyethylene fatty acid esters (also called emulsifier A, e.g., emulsifier A-105 (C)17H33(CHCH2O)5H) Emulsifier A-103, emulsifier A-110, emulsifier A-115, etc.) and alkylphenol ethoxylates.
In the embodiment of the application, the desulfurized gypsum clinker can be prepared from desulfurized gypsum raw material (belonging to low-quality desulfurized gypsum) with the content of water-soluble chloride ions or water-soluble magnesium oxide exceeding the secondary index in the national standard GB/T37785-2019 flue desulfurized gypsum).
In the embodiment of the present application, the polyphosphate may be added in an amount of 0.1 to 1 part by weight, the cationic surfactant may be added in an amount of 0.1 to 1 part by weight, the nonionic surfactant may be added in an amount of 0.1 to 1 part by weight, the binder may be added in an amount of 0.3 to 0.6 part by weight, and the water may be added in an amount of 60 to 80 parts by weight, based on 100 parts by weight of the desulfurized gypsum clinker.
In embodiments herein, the ratio of the amount of cationic surfactant added to the amount of nonionic surfactant added may be from 1:4 to 4: 1.
In an embodiment of the present application, the binder may be starch.
Optionally, the binder is selected from any one or more of modified corn starch, modified tapioca starch, cross-linking agent or pre-gelatinized starch.
It is to be understood that the raw materials of the paper-faced gypsum board of the present application may include, in addition to the desulfurized gypsum clinker, polyphosphate, cationic surfactant, nonionic surfactant, binder, and water, paper-faced gypsum board additives commonly used in the art, such as, for example, foaming agents, water reducing agents, glass fibers, and the like.
In a second aspect, the present application provides a method of making a gypsum plasterboard as described above, comprising:
uniformly mixing the desulfurized gypsum clinker, the polyphosphate and the binder to obtain a mixture;
uniformly mixing the cationic surfactant, the nonionic surfactant and the water to obtain a compounded surfactant solution;
uniformly mixing the mixture with the compounded surfactant solution to obtain slurry; and
and attaching protective paper to the upper surface and the lower surface of the slurry, forming and drying to obtain the gypsum plaster board.
In a third aspect, the present application also provides a desulfurization gypsum pretreatment method, comprising:
uniformly mixing the desulfurized gypsum and the polyphosphate to obtain a mixture;
uniformly mixing a cationic surfactant, a nonionic surfactant and water to obtain a compound surfactant solution;
uniformly mixing the mixture with the compounded surfactant solution to obtain slurry;
optionally, water is removed from the slurry.
In the desulfurization gypsum pretreatment method of the embodiment of the application, whether to remove water from the slurry can be selected according to production needs, for example, water in the slurry can be removed first, and then a gypsum product is prepared; alternatively, the slurry may be used directly to prepare a gypsum product, for example, a binder may be added directly to the slurry, followed by addition of a cover paper, molding, and drying to obtain a gypsum plaster board.
In the desulfurization gypsum pretreatment method of the embodiment of the present application, the desulfurization gypsum may be desulfurization gypsum clinker or desulfurization gypsum raw material.
Optionally, when the desulfurized gypsum is desulfurized gypsum clinker, the addition amount of the polyphosphate is 0.1-1 part by weight, the addition amount of the cationic surfactant is 0.1-1 part by weight, and the addition amount of the nonionic surfactant is 0.1-1 part by weight, based on 100 parts by weight of the addition amount of the desulfurized gypsum clinker.
In embodiments herein, the ratio of the amount of cationic surfactant added to the amount of nonionic surfactant added may be from 1:4 to 4: 1.
According to the application, the cationic surfactant, the nonionic surfactant and the polyphosphate are introduced into the preparation raw materials of the paper-surface gypsum board, so that not only is no adverse effect on the performance of the paper-surface gypsum board brought, but also the water-soluble MgO content in the paper-surface gypsum board and the water-soluble chloride ion content in a sandwich layer of a core material of the gypsum board are obviously reduced, the breaking load and the bonding performance of the paper-surface gypsum board are improved, and the low-quality desulfurized gypsum can be adopted to prepare the qualified paper-surface gypsum board.
The desulfurization gypsum pretreatment method can effectively reduce the content of water-soluble MgO and chloride ions in the desulfurization gypsum, so that the low-quality desulfurization gypsum can be adopted to prepare qualified gypsum products such as gypsum plasterboards.
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 instrumentalities and methods described in the specification.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. 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 desulfurized gypsum used in the following examples and comparative examples was obtained from the electric Kunming Yang Zong sea power plant and was processed into clinker, the content of water-soluble impurities in which is shown in Table 1.
TABLE 1 Water-soluble impurity ion content in desulfurized Gypsum Clinker
(1) According to the raw materials and the addition amount in the tables 2 and 3, uniformly mixing the gypsum clinker, the polyphosphate and the binder to obtain a mixture;
(2) uniformly mixing a surfactant and water according to the raw materials and the addition amounts in the tables 2 and 3 to obtain a compounded surfactant solution;
(3) adding the mixture obtained in the step (1) into the compounded surfactant solution obtained in the step (2) to obtain slurry; and
(4) and attaching protective paper to the upper and lower surfaces of the slurry, forming, drying at 160 deg.C for 30min, drying at 110 deg.C for 90min, and drying at 45 deg.C to constant weight to obtain 9.5mm thick gypsum board.
TABLE 2 raw materials and their addition amounts in the examples
TABLE 3 raw materials and their addition amounts for comparative examples
Note: "/" indicates no addition.
The gypsum boards prepared in the above examples and comparative examples were tested for transverse breaking load, longitudinal breaking load, and dry adhesion property, and for wet-heat adhesion property, which reflects the adhesion property of the gypsum board after being affected with moisture, according to the Chinese national standard GB/T9775-2008 "gypsum plasterboard". The wet and hot bonding performance test adopts a detection mode that a cross knife cuts the paper-faced gypsum board after steam heating, a water bath pot is set to be 100 ℃, when the temperature reaches 98 ℃, the gypsum board is placed on a support of the water bath pot, steam heating is carried out for 10min, after the gypsum board is taken out of the water bath pot, two knives are cut on the gypsum board by a wallpaper knife in a staggered mode, the top end of a triangle is lifted and torn upwards, and the bonding condition of the protective paper and the gypsum is checked. The results are shown in Table 4.
TABLE 4 mechanical and adhesive Properties of thistle boards
Note: the adhesion properties are classified into 5 types, i type: the paper boards are firmly bonded and are not separated after being lifted; and II: a small part is separated, and a large part is intact; class III: half of the adhesive is firmly adhered, and the other half of the adhesive is separated; and IV: most of the materials are separated, and only a small part of the materials are firmly adhered; and V, type: the cardboard is totally separated.
From comparative examples 1 to 5, it can be seen that the performance of the prepared gypsum plaster board is poor no matter any one or more of cationic surfactant, nonionic surfactant and polyphosphate is lacked, and even the performance of the gypsum plaster board does not meet the requirements of Chinese national standard GB/T9775-2008 paper plaster board; from comparative examples 6 to 8, it can be seen that when the cationic surfactant, the nonionic surfactant or the polyphosphate is not suitable, the performance of the prepared gypsum plasterboard can not meet the requirements of the Chinese national standard GB/T9775-2008 'gypsum plasterboard'; the cationic surfactant, the nonionic surfactant and the polyphosphate related to the invention are added simultaneously in the embodiment of the application, so that the performance of the gypsum plaster board is not affected (shown by comparison with a comparative example 1), the breaking load and the bonding performance of the gypsum plaster board are improved, the performance of the prepared gypsum plaster board meets the requirements of the national standard GB/T9775-2008 gypsum plaster board, and the three components, namely the cationic surfactant, the nonionic surfactant and the polyphosphate are all absent, and the three components synergistically act to improve the breaking load and the bonding performance of the gypsum plaster board.
In order to further verify the existence and distribution of impurity ions in the paper-surface gypsum board, water-soluble magnesium ions and water-soluble chloride ions are respectively detected according to the national standard GB/T5484-2012 gypsum chemical analysis method. The water-soluble MgO detects the total content of the core of the gypsum plaster board except the facing paper and the water-soluble chloride ions, and has extremely strong mobility, so the water-soluble chloride ions detect the content of the facing paper, the gypsum interlayer and the core of the gypsum plaster board, the thickness of the interlayer and the core is 2mm, and the detection results are shown in Table 6.
TABLE 5 Water-soluble MgO content and chloride ion distribution in paper-faced gypsum board core
It can be seen that the water soluble MgO content of the gypsum plasterboards of examples 1-3 of the present application is significantly reduced, indicating that the addition of the surfactant and polyphosphate in examples 1-3 of the present application reduces the amount of magnesium ions in the gypsum. Meanwhile, the content of interlayer chloride ions is also reduced along with the increase of the surfactant and the polyphosphate.
As can be seen from comparative examples 2 to 5, the main component for removing chloride ions was a cationic surfactant, followed by a nonionic surfactant; as is clear from example 2 and comparative examples 2 and 4, when two surfactants were used simultaneously, the adsorption effect was enhanced. Therefore, the proper amount of the surfactant is added, so that the migration of chloride ions in the gypsum board core can be effectively inhibited, the chloride ion concentration in the interlayer between the gypsum board and the facing paper is reduced, and the problem of poor bonding between the facing paper and the board core is solved.
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 paper-faced gypsum board, the raw materials of which comprise: desulfurized gypsum clinker, polyphosphate, cationic surfactant, nonionic surfactant, binder and water.
2. The paper-faced gypsum board of claim 1, wherein the polyphosphate is selected from any one or more of chain polyphosphates, cyclic metaphosphates, and ultraphosphates, optionally from any one or more of tripolyphosphates, tetrapolyphosphates, hexametaphosphates, trimetaphosphates, and tetrametaphosphates.
3. The gypsum plasterboard of claim 1, wherein the cationic surfactant is selected from any one or more of long chain quaternary ammonium salts, wherein the number of carbon atoms of a long chain is twelve, fourteen, sixteen and eighteen, and the number of long chains is one; optionally, the cationic surfactant is selected from any one or more of dodecyl dimethyl benzyl ammonium chloride, tetradecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and octadecyl trimethyl ammonium chloride.
4. The paper-faced gypsum board of claim 1, wherein the nonionic surfactant is selected from any one or more of span-based nonionic surfactants and polyoxyethylene-based nonionic surfactants;
optionally, the Span-type nonionic surfactant comprises Span-20 and Span-40, and the polyoxyethylene-type nonionic surfactant comprises alkylphenol ethoxylates, polyoxyethylene fatty acid ester and alkylphenol ethoxylates.
5. The gypsum plaster board as claimed in claim 1, wherein the desulfurized gypsum clinker is prepared from desulfurized gypsum raw material containing water-soluble chloride ions or water-soluble magnesium oxide with content exceeding the secondary index of national standard GB/T37785-2019 flue gas desulfurization gypsum.
6. The gypsum plasterboard according to any one of claims 1 to 5, wherein the polyphosphate is added in an amount of 0.1 to 1 part by weight, the cationic surfactant is added in an amount of 0.1 to 1 part by weight, the nonionic surfactant is added in an amount of 0.1 to 1 part by weight, the binder is added in an amount of 0.3 to 0.6 part by weight, and the water is added in an amount of 60 to 80 parts by weight, based on 100 parts by weight of the desulfurized gypsum clinker.
7. The gypsum plasterboard of claim 6, wherein the binder is starch, optionally any one or more selected from modified corn starch, modified tapioca starch, a cross-linking agent or pre-gelatinized starch.
8. A method of making a paper-faced gypsum board according to any one of claims 1-7, comprising:
uniformly mixing the desulfurized gypsum clinker, the polyphosphate and the binder to obtain a mixture;
uniformly mixing the cationic surfactant, the nonionic surfactant and the water to obtain a compounded surfactant solution;
uniformly mixing the mixture with the compounded surfactant solution to obtain slurry; and
and attaching protective paper to the upper surface and the lower surface of the slurry, forming and drying to obtain the gypsum plaster board.
9. A desulfurization gypsum pretreatment method comprising:
uniformly mixing the desulfurized gypsum and the polyphosphate to obtain a mixture;
uniformly mixing a cationic surfactant, a nonionic surfactant and water to obtain a compound surfactant solution;
uniformly mixing the mixture with the compounded surfactant solution to obtain slurry;
optionally, water is removed from the slurry.
10. The desulfurization gypsum pretreatment method of claim 9, wherein the desulfurization gypsum is desulfurization gypsum clinker or desulfurization gypsum raw material;
optionally, when the desulfurized gypsum is desulfurized gypsum clinker, the addition amount of the polyphosphate is 0.1-1 part by weight, the addition amount of the cationic surfactant is 0.1-1 part by weight, and the addition amount of the nonionic surfactant is 0.1-1 part by weight, based on 100 parts by weight of the addition amount of the desulfurized gypsum clinker.
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Cited By (3)
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| CN112707708A (en) * | 2020-12-29 | 2021-04-27 | 中建材创新科技研究院有限公司 | Paper-surface gypsum board and preparation method thereof |
| CN113829694A (en) * | 2021-09-10 | 2021-12-24 | 北新集团建材股份有限公司 | Paper-surface gypsum board and preparation method thereof |
| CN114409285A (en) * | 2022-01-05 | 2022-04-29 | 北新集团建材股份有限公司 | Gypsum raw material pretreatment method |
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| CN110759691A (en) * | 2018-07-27 | 2020-02-07 | 北新集团建材股份有限公司 | Environment-friendly phase-change gypsum board and preparation method thereof |
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| AU2012225641B2 (en) * | 2011-03-10 | 2016-03-31 | Georgia-Pacific Gypsum Llc | Lightweight gypsum wallboard |
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| CN112707708A (en) * | 2020-12-29 | 2021-04-27 | 中建材创新科技研究院有限公司 | Paper-surface gypsum board and preparation method thereof |
| CN113829694A (en) * | 2021-09-10 | 2021-12-24 | 北新集团建材股份有限公司 | Paper-surface gypsum board and preparation method thereof |
| CN114409285A (en) * | 2022-01-05 | 2022-04-29 | 北新集团建材股份有限公司 | Gypsum raw material pretreatment method |
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