CN114735962A - Modified additive for calcined gypsum and preparation method thereof - Google Patents
Modified additive for calcined gypsum and preparation method thereof Download PDFInfo
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- CN114735962A CN114735962A CN202210421895.0A CN202210421895A CN114735962A CN 114735962 A CN114735962 A CN 114735962A CN 202210421895 A CN202210421895 A CN 202210421895A CN 114735962 A CN114735962 A CN 114735962A
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- calcined gypsum
- gypsum
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- 239000010440 gypsum Substances 0.000 title claims abstract description 69
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 69
- 239000000654 additive Substances 0.000 title claims abstract description 44
- 230000000996 additive effect Effects 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003381 stabilizer Substances 0.000 claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 6
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical group O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 19
- 239000011426 gypsum mortar Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 8
- 239000012496 blank sample Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 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 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010016807 Fluid retention Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- 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
- C04B28/143—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 phosphogypsum
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a modified additive for calcined gypsum and a preparation method thereof, wherein the modified additive comprises the following steps: s1, firstly putting 200-500 parts by weight of sulphoaluminate cement and 10-100 parts by weight of water reducing agent into a mixer, and stirring and mixing to obtain a mixture; s2, adding 350-650 parts by weight of ash calcium, 5-10 parts by weight of suspension stabilizer and 1-30 parts by weight of cellulose ether into a mixer, and stirring to obtain the modified additive for the calcined gypsum. Through the mode, the modification additive for the calcined gypsum and the preparation method thereof can be added in the practical application of various gypsum mortars, and can reduce the water consumption, improve the surface strength and solve the cracking problem when the same construction performance is kept.
Description
Technical Field
The invention relates to the field of modified additives for gypsum, in particular to a modified additive for calcined gypsum and a preparation method thereof.
Background
The gypsum is used as a building material and has a plurality of excellent performances such as light weight, fire resistance, sound absorption and the like, and the gypsum mortar has the characteristic of micro-expansion in the hydration hardening process, so that the problems of cracking and the like can be avoided.
Gypsum is used in cementitious materials to produce gypsum board, gypsum mortar, and the like, and it is necessary to first calcine it to form building gypsum having beta calcium sulfate hemihydrate as the major phase. According to the regulation of GB/T9776 building gypsum, the semi-hydrated gypsum phase content, the III type anhydrous gypsum phase content and the dihydrate gypsum phase content in the calcined building gypsum are respectively not less than 75%, not more than 8% and not more than 4%.
In the production process, the over-burning of the building gypsum leads to the increase of the content of the III type anhydrous gypsum phase, and the cracking of a plastering layer is easily caused. The under-burning of the building gypsum causes the content of dihydrate gypsum phase to be higher, the coagulation accelerating effect is obvious, and the consumption of retarder is multiplied. When the content of the over-burnt building gypsum, namely the III type anhydrous gypsum phase is higher, the aging treatment can be carried out to convert the anhydrous gypsum phase into the hemihydrate gypsum, but the aging generally needs 14 days or more, and needs to be improved.
Disclosure of Invention
The invention mainly solves the technical problem of providing a modified additive for over-burned gypsum and a preparation method thereof aiming at over-burned building gypsum (one of desulfurized building gypsum, phosphorus building gypsum and citric acid building gypsum), so as to improve the cracking phenomenon of the over-burned gypsum in the practical application of gypsum mortar.
In order to solve the technical problems, the invention adopts a technical scheme that: the preparation method of the modified additive for the calcined gypsum comprises the following steps:
s1, firstly putting 200-500 parts by weight of sulphoaluminate cement and 10-100 parts by weight of water reducing agent into a mixer, and stirring and mixing to obtain a mixture;
and S2, adding 350-650 parts by weight of ash calcium, 5-10 parts by weight of suspension stabilizer and 1-30 parts by weight of cellulose ether into a mixer, stirring to obtain the modified additive for the calcined gypsum, and improving the homogeneity of the gypsum mortar by using the suspension stabilizer under the condition that the viscosity is not obviously improved so as to ensure that the gypsum mortar is uniform on the surface and the inside.
In a preferred embodiment of the invention, the sulphoaluminate cement adopts sulphoaluminate cement of 42.5 grade of rapid hardening, meets the standard requirement of GB 20472-2006, and can increase the hardness of the surface of the gypsum mortar.
In a preferred embodiment of the present invention, the Ca (OH) in the gray calcium2The content of the calcium sulfate is more than or equal to 90 percent, the fineness requirement is more than or equal to 100 meshes, the general PH of the building gypsum is less than or equal to 7 and is neutral or acidic, and the lime calcium is added to provide an alkaline environment, so that other additives can fully play a role.
In a preferred embodiment of the invention, the cellulose ether is one of hydroxyethyl cellulose or hydroxypropyl methyl cellulose, improves the water retention of the gypsum mortar, and has a viscosity specification of 400-100000 Pa-s.
In a preferred embodiment of the invention, the water reducing agent is a melamine water reducing agent, and the water consumption is reduced on the basis of maintaining certain constructability, so that the hardening effect is achieved.
In order to solve the technical problem, the invention adopts another technical scheme that: provides a modified additive for calcined gypsum prepared by the preparation method of the modified additive for calcined gypsum.
The invention has the beneficial effects that: the modified additive for the calcined gypsum and the preparation method thereof can be added in the practical application of various gypsum mortars, for example, the modified additive for the calcined gypsum is added in the basic proportioning of the calcined gypsum plaster, or the modified additive for the calcined gypsum is added in the basic proportioning of the calcined gypsum, so that the water consumption is slightly reduced, the surface strength is improved quickly, the surface and the inside are consistent, the cracking problem is improved, and the compressive strength is favorably improved when the same construction performance is maintained.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1:
a modified additive for calcined gypsum and a preparation method thereof comprise the following steps:
s1, firstly putting 500 parts by weight of rapid-hardening 42.5-grade sulphoaluminate cement and 94 parts by weight of melamine water reducer into a mixer, and stirring and mixing to obtain a mixture, wherein the melamine water reducer is an SM melamine water reducer produced by Suzhou Xingbang chemical building materials Co.Ltd;
s2, adding 400 parts by weight of ash calcium, 5 parts by weight of suspension stabilizer and 1 part by weight of hydroxyethyl cellulose with the viscosity specification of 100000 Pa.s into a mixer, and stirring to obtain the modified additive for the calcined gypsum, wherein the suspension stabilizer is ST-1001 suspension stabilizer produced by Xingpeng chemical building materials Co., Ltd, Suzhou;
example 2:
a preparation method of a modified additive for calcined gypsum comprises the following steps:
s1, firstly putting 400 parts by weight of rapid hardening 42.5-grade sulphoaluminate cement and 80 parts by weight of melamine water reducing agent into a mixer, and stirring and mixing to obtain a mixture;
s2, adding 510 parts by weight of ash calcium, 5 parts by weight of ST-1001 suspension stabilizer and 5 parts by weight of hydroxypropyl methyl cellulose with the viscosity specification of 40000 Pa S into a mixer, and stirring to obtain the modified additive for the calcined gypsum;
example 3:
a preparation method of a modified additive for calcined gypsum comprises the following steps:
s1, putting 350 parts by weight of rapid hardening 42.5-grade sulphoaluminate cement and 60 parts by weight of melamine water reducing agent into a mixer, and stirring and mixing to obtain a mixture;
s2, adding 575 parts by weight of ash calcium, 5 parts by weight of ST-1001 suspension stabilizer and 10 parts by weight of hydroxypropyl methyl cellulose with the viscosity specification of 400Pa S into a mixer, and stirring to obtain the modified additive for the calcined gypsum;
example 4:
a preparation method of a modified additive for calcined gypsum comprises the following steps:
s1, putting 300 parts by weight of rapid hardening 42.5-grade sulphoaluminate cement and 46 parts by weight of melamine water reducer into a mixer, and stirring and mixing to obtain a mixture;
s2, adding 640 parts by weight of gray calcium, 10 parts by weight of ST-1001 suspension stabilizer and 4 parts by weight of hydroxypropyl methyl cellulose with the viscosity specification of 100000Pa S into a mixer, and stirring to obtain the modified additive for the calcined gypsum.
Comparative example 1 (gypsum based self-leveling):
blank sample 1 proportioning:
950 parts by weight of citric acid gypsum (type III anhydrous gypsum phase ratio 8%)
43 parts by weight of PO42.5 cement
PC-1050 (polycarboxylic acid water reducer, available from Kyoho chemical building materials Co., Ltd., Suzhou) 3.0 part by weight
SG-12X (Gypsum retarder, produced by Kyoho chemical building materials Co., Ltd., Suzhou) 3.0 parts by weight
A-406 (antifoaming agent, produced by Kyoho chemical building materials Co., Ltd., Suzhou) 1.0 part by weight
The test method comprises the following steps:
the comparative performance test of the modified additives obtained in examples 1 to 4 and blank sample 1 is carried out, and the specific test method is as follows: initial fluidity, 30-minute fluidity and absolute dry compressive strength are referenced to JC/T1023-2021 gypsum-based self-leveling mortar. Surface cracking a sample block of 30cmX30cmX3cm was molded in a silicone mold and observed for surface cracking.
The specific test results are shown in the following table:
| composition (I) | 1000 portions Blank sample 1 | 980 parts of blank 1+20 parts of example 1 Modified additive for obtained calcined gypsum | 980 parts of blank 1+20 parts of example 2 Modified additive for obtained calcined gypsum | 980 parts of blank 1+20 parts of example 3 Modified additive for obtained calcined gypsum | 980 parts of blank 1+20 parts of example 3 Modified additive for obtained calcined gypsum |
| Amount of water used | 52% | 50% | 50% | 50% | 50% |
| Initial flow Degree (mm) | 160 | 165 | 165 | 162 | 160 |
| 30Min flow Motion degree (mm) | 140 | 155 | 150 | 145 | 142 |
| Absolutely dry pressure resistance Strength of （MPa） | 15 | 17 | 17 | 16 | 16 |
| Surface cracking Condition of the condition | Crack tightly Heavy load | Without cracking | Without cracking | Without cracking | Without cracking |
Comparative example 2 (light plastering gypsum):
blank sample 2 proportioning:
617 parts by weight of citric acid gypsum (type III anhydrous gypsum phase proportion 8%)
80 parts by weight of vitrified micro bubbles (commercially available at 70-90 meshes)
300 parts by weight of 300 mesh heavy calcium carbonate (commercially available)
2 parts by weight of 10 ten thousand viscosity hydroxypropyl methylcellulose ether (commercially available)
1 part by weight of SG-12X (Gypsum retarder, Kyoho chemical building materials Co., Ltd., Suzhou city)
The test method comprises the following steps:
the comparative performance test of the modified additive for calcined gypsum obtained in examples 1 to 4 and the blank sample 2 is carried out by the following specific test method: the standard expansion degree water consumption, the jumping table fluidity and the absolute dry compressive strength refer to GB/T28627-2012 plastered gypsum, the surface cracking condition is observed on aerated building blocks, and a sample block of 30cmX30cmX3mm is plastered and formed.
The specific test results are shown in the following table:
| composition (I) | 1000 portions Blank sample 2 | 980 parts of blank 2+20 parts of example 1 Modified additive for obtained calcined gypsum | 980 parts of blank 2+20 parts of example 2 Modified additive for obtained calcined gypsum | 980 parts of blank 2+20 parts of example 3 Modified additive for obtained calcined gypsum | 980 parts of blank 2+20 parts of example 4 Modified additive for obtained calcined gypsum |
| Standard extension Water consumption | 60% | 56% | 56% | 58% | 58% |
| Flow of jumping table Degree (mm) | 165 | 165 | 165 | 165 | 165 |
| Compressive strength （MPa） | 3.0 | 3.5 | 3.5 | 3.3 | 3.3 |
| Surface cracking Condition of the condition | Crack is severe Heavy load | Without cracking | Without cracking | Without cracking | Without cracking |
In conclusion, the modified additive for the calcined gypsum and the preparation method thereof can be added in the practical application of the gypsum mortar, can reduce the water consumption, improve the surface strength and solve the cracking problem caused by the calcined gypsum.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A preparation method of a modified additive for calcined gypsum is characterized by comprising the following steps:
s1, firstly putting 200-500 parts by weight of sulphoaluminate cement and 10-100 parts by weight of water reducing agent into a mixer, and stirring and mixing to obtain a mixture;
and S2, adding 350-650 parts by weight of ash calcium, 5-10 parts by weight of suspension stabilizer and 1-30 parts by weight of cellulose ether into a mixer, and stirring to obtain the modified additive for the calcined gypsum.
2. The method for preparing the modifying additive for the calcined gypsum according to claim 1, wherein the sulphoaluminate cement is fast-hardening 42.5 grade sulphoaluminate cement.
3. The method for preparing the modified additive for calcined gypsum according to claim 1, wherein the Ca (OH) in the ash calcium is2The content of (A) is more than or equal to 90 percent and the fineness isThe mesh size is not less than 100.
4. The method for preparing the modifying additive for calcined gypsum according to claim 1, wherein the cellulose ether is one of hydroxyethyl cellulose and hydroxypropyl methyl cellulose, and the viscosity specification of the cellulose ether is 400 to 100000 Pa-s.
5. The method for preparing the modified additive for calcined gypsum according to claim 1, wherein the water reducing agent is melamine water reducing agent.
6. A modified additive for calcined gypsum, which is characterized by being prepared by the method for preparing a modified additive for calcined gypsum according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210421895.0A CN114735962A (en) | 2022-04-21 | 2022-04-21 | Modified additive for calcined gypsum and preparation method thereof |
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