CN115215626B - Plaster, plaster preform and plaster preparation method - Google Patents

Plaster, plaster preform and plaster preparation method Download PDF

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Publication number
CN115215626B
CN115215626B CN202210756131.7A CN202210756131A CN115215626B CN 115215626 B CN115215626 B CN 115215626B CN 202210756131 A CN202210756131 A CN 202210756131A CN 115215626 B CN115215626 B CN 115215626B
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China
Prior art keywords
gypsum
parts
powder
plaster
desulfurized
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CN202210756131.7A
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Chinese (zh)
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CN115215626A (en
Inventor
刘慧根
夏嵩
戴晓瑞
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Clp Guorui Supply Chain Management Co ltd
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Clp Guorui Supply Chain Management Co ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/003—Methods for mixing
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/122—Hydroxy amines
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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 embodiment of the application provides plaster, a plaster prefabricated product and a plaster preparation method. A plaster of a first aspect of an embodiment of the present application comprises: the powder comprises desulfurized building gypsum, cement and mineral powder, and the liquid comprises alcohol amine auxiliary agents. The prefabricated product of the plastering gypsum can reduce the porosity of the plastering gypsum, prevent chloride ions from migrating to the surface of the gypsum, effectively solidify the chloride ions in the preparation of the plastering gypsum, and obviously improve the performance and quality of the prepared plastering gypsum.

Description

Plaster, plaster preform and plaster preparation method
Technical Field
The application relates to the technical field of plastering gypsum, in particular to plastering gypsum, a plaster prefabricated product and a plaster preparation method.
Background
A large amount of desulfurized gypsum is generated in the process of wet desulfurization of the mainstream technology of coal-fired flue gas desulfurization, and is used as a solid waste, so that the application of the desulfurized gypsum in building materials is wide at present, and plastering gypsum is generally prepared by adopting the desulfurized gypsum. However, the chloride ions contained in the desulfurized gypsum adversely affect the quality of the plastering gypsum, resulting in a decrease in the performance of the plastering gypsum, and it is necessary to avoid the adverse effect of the chloride ions contained in the chloridion-containing desulfurized gypsum on the performance of the plastering gypsum.
Therefore, there is a need for a new plaster, plaster preform and plaster preparation method.
Disclosure of Invention
A first aspect of the present application provides a plaster on plaster preform comprising: powder and liquid, wherein,
the powder comprises desulfurized building gypsum, cement and mineral powder, and the liquid comprises alcohol amine auxiliary agent.
The alcohol amine auxiliary agent in the plaster pre-product liquid can further enhance the hydration degree of powder in the plaster pre-product preparation process, promote the content of C-S-H gel, chloroaluminate and other substances to be increased, and promote Ca (OH) generated by hydration 2 The transformation of hydration products such as AFt (ettringite) to C-S-H gel and chloroaluminate respectively promotes the mass production of the C-S-H gel and the chloroaluminate, and realizes the fixation of chloride ions through physical adsorption and chemical solidification. In addition, increased hydration results in C-S-H gels and chloroaluminatesAFt, etc., can prevent migration of chloride ions to the gypsum surface by reducing the porosity of the plastered gypsum. In general, the alcohol amine auxiliary agent can effectively solidify chloride ions in the preparation of the plastering gypsum, and obviously improves the performance and quality of the prepared plastering gypsum.
In some alternative embodiments of the first aspect of the present application, the powder comprises, in parts by weight, 120 to 250 parts of desulfurized building gypsum, 7.5 to 25 parts of cement and 40 to 100 parts of mineral powder,
the liquid material comprises 0.09-0.40 part of alcohol amine auxiliary agent.
In some alternative embodiments of the first aspect of the present application, the amount of chloride ions in the desulfurized building gypsum is in the range of 500 to 2500mg/kg.
In some alternative embodiments of the first aspect of the present application, the chloride ion content is 800 to 2000mg/kg.
In some optional embodiments of the first aspect of the present application, the powder further comprises:
9 to 16 portions of cement, 0.18 to 0.55 portion of retarder, 0.36 to 0.64 portion of water retention agent, 3.96 to 7.07 portions of water reducing agent, 1.8 to 3.21 portions of waterproofing agent and 2.94 to 5.25 portions of redispersible emulsion powder.
In some alternative embodiments of the first aspect of the present application, the cement is Portland cement having a strength grade of 42.5.
In some optional embodiments of the first aspect of the present application, the ore powder is S95 type ore powder.
In some optional embodiments of the first aspect of the present application, the alcohol amine-based auxiliary is selected from one or more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, and monoethyl diisopropanolamine.
In some optional embodiments of the first aspect of the present application, the retarder is selected from any one of citric acid, sodium hexametaphosphate, and PE gypsum retarder.
In some optional embodiments of the first aspect of the present application, the water retaining agent is selected from any one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
In some optional embodiments of the first aspect of the present application, the water reducing agent is selected from any one of a polycarboxylate water reducing agent and a naphthalene-based water reducing agent.
In some alternative embodiments of the first aspect of the present application, the waterproofing agent is a silicone waterproofing agent.
In some alternative embodiments of the first aspect of the present application, the liquid further comprises 115-148 parts of water, the liquid being a homogeneous mixture.
The second aspect of the present application provides a method for preparing plastering gypsum, comprising:
providing a plaster pre-product, wherein the plaster pre-product comprises powder and liquid, the powder comprises desulfurized building plaster, cement and mineral powder, and the liquid comprises alcohol amine auxiliary agent;
mixing the powder and the liquid, and stirring uniformly to obtain the plastering gypsum.
The plastering gypsum provided by the second aspect of the application is simple and efficient to operate, and the performance and quality of the prepared plastering gypsum can be obviously improved.
In some optional embodiments of the second aspect of the present application, the powder comprises 120-250 parts by weight of desulfurized building gypsum, 7.5-25 parts by weight of cement and 40-100 parts by weight of mineral powder, and the liquid comprises 0.09-0.40 part by weight of alcohol amine-type compound alcohol amine-type auxiliary agent.
In some optional embodiments of the second aspect of the present application, the content of chloride ions in the desulfurized building gypsum is 500-2500 mg/kg;
in some alternative embodiments of the second aspect of the present application, the chloride ion content may need to be further limited according to specific examples.
In some optional embodiments of the second aspect of the present application, the powder further comprises:
9 to 16 portions of cement, 0.18 to 0.55 portion of retarder, 0.36 to 0.64 portion of water retention agent, 3.96 to 7.07 portions of water reducing agent, 1.8 to 3.21 portions of waterproofing agent and 2.94 to 5.25 portions of redispersible emulsion powder.
In some alternative embodiments of the second aspect of the present application, the liquid further comprises 115 to 148 parts of water, the liquid is a homogeneous mixture or the liquid comprises water and an alcohol amine adjuvant, each independently packaged.
In some optional embodiments of the second aspect of the present application, the method further includes:
drying the desulfurized gypsum to constant weight at 40-60 ℃ to obtain dried desulfurized gypsum,
grinding the dried desulfurized gypsum and passing through a 140-target standard sieve,
calcining the sieved desulfurized gypsum at 150-180 ℃ for 1.5-2.5 h, cooling and aging to obtain the desulfurized building gypsum.
A third aspect of the present application provides a plaster of paris made by the method of making plaster of paris provided in the second aspect of the present application.
The plastering gypsum provided by the third aspect of the application has the advantages that the water retention rate is superior to that of the general plastering gypsum, the tensile bonding strength is obviously improved, the shrinkage rate is obviously reduced, the phenomena of hollowness, cracking and the like of the plastering gypsum in the smearing and using process are effectively inhibited, and the performance and the quality of the plastering gypsum are greatly improved.
Detailed Description
The following description of the present application will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Features and exemplary embodiments of various aspects of the invention are described in detail below, and in order to make the objects, technical solutions and advantages of the invention more apparent, the invention is described in further detail below in connection with the specific embodiments. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The "range" disclosed herein is defined in terms of lower and upper limits, with a given range being defined by the selection of a lower and an upper limit, the selected lower and upper limits defining the boundaries of the particular range. Ranges that are defined in this way can be inclusive or exclusive of the endpoints, and any combination can be made, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3,4 and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed throughout, and "0-5" is simply a shorthand representation of a combination of these values. When a certain parameter is expressed as an integer of 2 or more, it is disclosed that the parameter is, for example, an integer of 2, 3,4, 5, 6, 7, 8, 9, 10, 11, 12 or the like.
All steps of the present application may be performed sequentially or randomly, preferably sequentially, unless otherwise indicated. For example, the method comprises steps (a) and (b), meaning that the method may comprise steps (a) and (b) performed sequentially, or may comprise steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), may include steps (a), (c) and (b), may include steps (c), (a) and (b), and the like.
Reference herein to "comprising" and "including" means open ended, as well as closed ended, unless otherwise noted. For example, the terms "comprising" and "comprises" may mean that other components not listed may be included or included, or that only listed components may be included or included.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
The inventor researches on plastering gypsum for a long time show that the plastering gypsum has the characteristics of large utilization amount of the desulfurized gypsum, wider application range, light weight, high strength, energy conservation and the like. The main raw materials for preparing the plastering gypsum are the desulfurization gypsum generated from wet desulfurization, and the cyclic utilization of water used in a desulfurization system causes continuous accumulation of chloride ions in a desulfurization absorption tower, so that the content of the chloride ions in the desulfurization gypsum generated in the desulfurization process is high, and the desulfurization gypsum can be generally called as high-chlorine desulfurization gypsum. However, the inventors have found that chloride ions in the desulphurised gypsum can adversely affect the quality of the plastered gypsum. For example: the chloride ions can directly influence the hydration process of the plastering gypsum, so that the indexes such as setting time, compressive strength, tensile bonding strength and the like of the plastering gypsum do not meet the construction standard; chloride ions can migrate in the slurry when the plastering gypsum is hydrated, and finally calcium chloride with extremely strong water absorbability is formed by combining the surface with calcium ions, so that the water absorbability of the plastering gypsum is enhanced, the problems of moisture regain, yellowing and the like of the plastering gypsum are caused, and the performance of the plastering gypsum is reduced. The plastering gypsum has poor water retention rate, low tensile bonding strength and high shrinkage rate, and is easy to cause hollowing and cracking in the use process. It is therefore necessary to control the chloride ions in the high chlorine content desulfurized gypsum to attenuate its negative impact on the gypsum performance of the plastering.
A first aspect of an embodiment of the present application provides a gypsum plaster preform comprising: powder and liquid, wherein the powder comprises desulfurized building gypsum, cement and mineral powder, and the liquid comprises alcohol amine auxiliary agent.
When preparing plastering gypsum, the desulfurization building gypsum in the powder material in the hydration process of the plastering gypsum can dissolve part of Ca 2+ The cement contains a large amount of Ca element and Si and Al elements with high content in mineral powder, which can be quickly dissolved into the slurry, and the elements react to generate substances such as C-S-H (hydrated calcium silicate) gel, AFt (ettringite), chloroaluminate and the like.
The alcohol amine auxiliary agent of the prefabricated product of the plastering gypsum provided by the first aspect of the application can be added into slurry to further enhance the hydration degree of powder materials comprising the desulfurized building gypsum, cement and mineral powder, promote the content of substances such as C-S-H gel, chloroaluminate and the like to be increased, and improve Ca in the cement and the building desulfurized gypsum 2+ Si in mineral powder 2+ 、Al 3+ And thereby promote the mutual reaction between the above ions, resulting in further increase in the production of C-S-H gel and chloroaluminate, and also promote Ca (OH) produced by hydration 2 The transformation of hydration products such as AFt (ettringite) to C-S-H gel and chloroaluminate, respectively, promotes the mass production of C-S-H gel and chloroaluminate.
The electric double-layer structure of the C-S-H gel has strong physical adsorption capacity to chloride ions; the chloroaluminate is formed by converting chloride ions into stable chemical species for curing. Meanwhile, the large amount of hydration products such as C-S-H gel, chloroaluminate, AFt and the like can reduce the porosity of the plastering gypsum and prevent chloride ions from migrating to the surface of the gypsum. The formation of the C-S-H gel and chloroaluminate can inhibit the migration of chloride ions, so that the water absorption of the plastering gypsum is reduced, and meanwhile, the water retention rate is further improved, so that the occurrence of the moisture regain phenomenon of the plastering gypsum can be more inhibited, namely, the performance problem caused by the strong water absorption of the plastering gypsum is inhibited. In general, the alcohol amine auxiliary agent is added into the prefabricated product of the plastering gypsum, and can effectively solidify chloride ions in three aspects of physical adsorption, chemical fixation and cutting off of chloride ion migration channels in the preparation of the plastering gypsum, so that the performance and quality of the prepared plastering gypsum are obviously improved. The high-chlorine-content desulfurization building gypsum used as the solid waste of the power plant is used as the raw material of plastering gypsum, so that the solid waste of the electric field can be utilized in a large amount.
In some optional embodiments of the first aspect of the embodiments of the present application, the powder material includes 120-250 parts by weight of desulfurized building gypsum, 7.5-25 parts by weight of cement and 40-100 parts by weight of mineral powder, and the liquid material includes 0.09-0.40 parts by weight of alcohol amine auxiliary agent.
In some optional embodiments of the first aspect of the embodiments of the present application, the powder material includes 120-250 parts by weight of desulfurized building gypsum, 7.5-25 parts by weight of cement and 40-100 parts by weight of mineral powder, the liquid material includes 0.09-0.40 part by weight of alcohol amine auxiliary agent, and the content of chloride ions in the desulfurized building gypsum is 500-2500 mg/kg.
In these alternative examples, the inventors found that when the content of chloride ions in the desulfurized building gypsum is 500-2500 mg/kg, the effect of curing chloride ions in three aspects of physical adsorption, chemical fixation and cutting off of chloride ion migration channels is superior when the parts by weight of each component in the powder and the parts by weight of each component in the liquid satisfy the above ranges, so that the performance and quality improvement of plastering gypsum are ensured.
In some alternative embodiments of the first aspect of the embodiments of the present application, the amount of chloride ions in the desulfurized building gypsum is in the range of 800 to 2000mg/kg.
In some optional embodiments of the first aspect of the embodiments of the present application, the powder further includes: 9 to 16 portions of cement, 0.18 to 0.55 portion of retarder, 0.36 to 0.64 portion of water retention agent, 3.96 to 7.07 portions of water reducing agent, 1.8 to 3.21 portions of waterproofing agent and 2.94 to 5.25 portions of redispersible emulsion powder.
In some optional embodiments of the first aspect of the embodiments of the present application, the liquid further comprises 115-148 parts of water, and the liquid is a homogeneous mixture. In some embodiments, the liquid material is a homogeneous mixture of an alcohol amine adjuvant and water, which may be selected from deionized water.
In some alternative embodiments of the first aspect of the embodiments of the present application, the cement is Portland cement having a strength grade of 42.5.
In some optional embodiments of the first aspect of the embodiments of the present application, the ore powder is S95 type ore powder;
in some optional embodiments of the first aspect of the embodiments of the present application, the alcohol amine-based auxiliary is selected from one or more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, monoethyl diisopropanolamine;
in some optional embodiments of the first aspect of the embodiments of the present application, the retarder is selected from any one of citric acid, sodium hexametaphosphate, and PE gypsum retarder.
In some optional embodiments of the first aspect of the embodiments of the present application, the water retaining agent is selected from any one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
In some optional embodiments of the first aspect of the embodiments of the present application, the water reducing agent is selected from any one of a polycarboxylate water reducing agent and a naphthalene-based water reducing agent.
In some alternative embodiments of the first aspect of the embodiments of the present application, the waterproofing agent is a silicone waterproofing agent.
The second aspect of the present application provides a method for preparing plastering gypsum, comprising:
s10: providing a plaster pre-product, wherein the plaster pre-product comprises powder and liquid, the powder comprises desulfurized building plaster, cement and mineral powder, and the liquid comprises alcohol amine auxiliary agent;
s20: mixing the powder and the liquid, and stirring uniformly to obtain the plastering gypsum.
The plastering gypsum provided by the second aspect of the application is simple and efficient to operate, and the performance and quality of the prepared plastering gypsum can be obviously improved.
In some optional embodiments of the second aspect of the present application, the powder comprises 120-250 parts by weight of desulfurized building gypsum, 7.5-25 parts by weight of cement and 40-100 parts by weight of mineral powder, and the liquid comprises 0.09-0.40 parts by weight of alcohol amine-type compound alcohol amine-type auxiliary agent.
In some alternative embodiments of the second aspect of the present application, the amount of chloride ions in the desulfurized architectural gypsum is in the range of 500 to 2500mg/kg.
In some alternative embodiments of the first aspect of the present application, the chloride ion content is 800 to 2000mg/kg.
In some optional embodiments of the second aspect, the powder further comprises: 9 to 16 portions of cement, 0.18 to 0.55 portion of retarder, 0.36 to 0.64 portion of water retention agent, 3.96 to 7.07 portions of water reducing agent, 1.8 to 3.21 portions of waterproofing agent and 2.94 to 5.25 portions of redispersible emulsion powder.
In some alternative embodiments of the second aspect of the present application, the liquid further comprises 115 to 148 parts of water, the liquid being a homogeneous mixture or the liquid comprising water and an alcohol amine adjuvant, each independently packaged.
In some examples of the above embodiments, when the liquid material is a homogeneous mixture, that is, the liquid material contains water and an alcohol amine-based auxiliary agent which are homogeneously mixed, the liquid material and the powder material may be mixed in step S20.
In some examples of the above embodiments, when the liquid material contains water and an alcohol amine-based auxiliary agent, which are individually packaged, the powder material, the alcohol amine-based auxiliary agent in the liquid material, and the water in the liquid material may be added to the stirring vessel in step S20, respectively, to be mixed, and stirred uniformly.
In some optional embodiments of the second aspect of the present application, the method for preparing plastered gypsum further comprises:
s01: drying the desulfurized gypsum to constant weight at 40-60 ℃ to obtain dried desulfurized gypsum,
grinding the dried desulfurized gypsum and passing through a 140-target standard sieve,
calcining the sieved desulfurized gypsum at 150-180 ℃ for 1.5-2.5 h, cooling and aging to obtain the desulfurized building gypsum.
In these examples, desulfurized gypsum refers to: the substances produced by wet desulfurization of coal-fired flue gas power plants are mainlyThe component is calcium sulfate dihydrate (CaSO) 4 ·2H 2 O). The definition of the desulfurized building gypsum is that the desulfurized gypsum is obtained after calcination, cooling and aging, and the main component is calcium sulfate hemihydrate (CaSO) 4 ·1/2H 2 O)；
A third aspect of the present application provides a plaster of paris made by the method of making plaster of paris provided in the second aspect of the present application.
The plastering gypsum provided by the third aspect of the application has the advantages that the water retention rate is superior to that of the general plastering gypsum, the tensile bonding strength is obviously improved, the shrinkage rate is obviously reduced, the phenomena of hollowness, cracking and the like of the plastering gypsum in the smearing and using process are effectively inhibited, and the performance and the quality of the plastering gypsum are greatly improved.
[ example ]
In order to make the objects, technical solutions and advantageous technical effects of the present application clearer, the present application is further described in detail below with reference to examples. However, it should be understood that the examples of the present application are merely for the purpose of explaining the present application and are not intended to limit the present application, and the examples of the present application are not limited to the examples given in the specification. The experimental conditions are not noted in the examples as conventional conditions or as recommended by the material supplier or equipment supplier.
1. The preparation method of plaster gypsum comprises the following steps:
example 1
1.1 the plaster of example 1 was prepared from the components of the preform:
powder material: 126 parts of desulfurized building gypsum, 9 parts of P.O.42.5 ordinary Portland cement, 45 parts of S95 type mineral powder, 0.18 part of PE gypsum retarder, 0.36 part of hydroxyethyl methyl cellulose ether with the viscosity of 200000, 3.95 parts of polycarboxylate water reducer, 1.8 parts of organosilicon waterproofing agent and 2.934 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 1350-1500 mg/kg.
Liquid material: triethanolamine 0.09 parts and deionized water 115 parts.
1.2 the preparation method of plastering gypsum in example 1:
s1: drying the desulfurized gypsum to constant weight at 50 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 150 ℃ for 2.5 hours, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing and stirring the triethanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
Example 2
2.1 the plaster of example 2 was prepared from the following components:
powder material: 126 parts of desulfurized building gypsum, 9 parts of P.O.42.5 ordinary Portland cement, 45 parts of S95 type mineral powder, 0.18 part of PE gypsum retarder, 0.36 part of hydroxypropyl methyl cellulose ether with viscosity of 100000, 3.95 parts of naphthalene water reducer, 1.8 parts of organosilicon waterproofing agent and 2.934 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 800-1040 mg/kg.
Liquid material: triisopropanolamine 0.15 parts and deionized water 115 parts.
2.2 the preparation method of plastering gypsum in example 2:
s1: drying the desulfurized gypsum to constant weight at 50 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 175 ℃ for 2.5 hours, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing triisopropanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
Example 3
3.1 the plaster gypsum of example 3 was prepared from the following components:
powder material: 225 parts of desulfurized building gypsum, 16 parts of P.O.42.5 ordinary Portland cement, 80 parts of S95 type mineral powder, 0.55 part of citric acid, 0.64 part of hydroxyethyl methyl cellulose ether with the viscosity of 200000, 7 parts of naphthalene water reducer, 3.2 parts of organosilicon waterproofing agent and 5 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 1520-1670 mg/kg.
Liquid material: 0.13 part of triethanolamine, 0.15 part of diethanol monoisopropanolamine and 145 parts of deionized water.
3.2 the method for preparing plastering gypsum in example 3:
s1: drying the desulfurized gypsum to constant weight at 60 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 175 ℃ for 1.5h, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing and stirring the triethanolamine, the diethanol monoisopropanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
Example 4
4.1 the plaster of example 4 was prepared from the following components:
powder material: 150 parts of desulfurized building gypsum, 8 parts of P.O.42.5 ordinary Portland cement, 40 parts of S95 type mineral powder, 0.28 part of citric acid, 0.7 part of hydroxypropyl methyl cellulose ether with viscosity of 150000, 4 parts of polycarboxylate water reducer, 2 parts of organosilicon waterproofing agent and 3 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 1720-1810 mg/kg.
Liquid material: 0.15 part of ethylene-di-isopropanolamine and 100 parts of deionized water.
3.2 the method for preparing plastering gypsum in example 3:
s1: drying the desulfurized gypsum to constant weight at 40 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum, sieving with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 160 ℃ for 2 hours, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing and stirring the monoethyl diisopropanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
Example 5
5.1 the plaster of example 5 was prepared from the following components:
powder material: 225 parts of desulfurized building gypsum, 16 parts of P.O.42.5 ordinary Portland cement, 80 parts of S95 type mineral powder, 0.55 part of sodium hexametaphosphate, 0.64 part of hydroxypropyl methyl cellulose ether with the viscosity of 100000, 7 parts of polycarboxylate water reducer, 3.2 parts of organosilicon waterproofing agent and 5 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 1840-1930 mg/kg.
Liquid material: triethanolamine 0.30 parts and deionized water 145 parts.
5.2 the method for preparing plaster in example 5:
s1: drying the desulfurized gypsum to constant weight at 60 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 180 ℃ for 1.5h, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing and stirring the triethanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
Comparative example 1
6.1 the plaster gypsum of comparative example 1 was prepared from the following components:
powder material: 126 parts of desulfurized building gypsum, 9 parts of P.O.42.5 ordinary Portland cement, 45 parts of S95 type mineral powder, 0.18 part of PE gypsum retarder, 0.36 part of hydroxyethyl methyl cellulose ether with the viscosity of 200000, 3.95 parts of polycarboxylate water reducer, 1.8 parts of organosilicon waterproofing agent and 2.934 parts of redispersible emulsion powder, wherein the content of chloride ions in the desulfurized building gypsum is 1350-1500 mg/kg.
Liquid material: 115 parts of deionized water and no alcohol amine auxiliary agent.
6.2 preparation of plastering gypsum in comparative example 1:
s1: drying the desulfurized gypsum to constant weight at 60 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 180 ℃ for 1.5h, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: adding deionized water into the uniformly dispersed powder, and uniformly stirring the powder and the deionized water to obtain plastering gypsum.
In the comparative example 1, no alcohol amine auxiliary agent was added to the liquid.
Comparative example 2
7.1 the plaster gypsum of comparative example 2 was prepared from the following components:
powder material: 126 parts of desulfurized building gypsum, 0.18 part of PE gypsum retarder, 0.36 part of hydroxyethyl methyl cellulose ether with the viscosity of 200000, 3.95 parts of polycarboxylate water reducer, 1.8 parts of organosilicon waterproofing agent and 2.934 parts of redispersible emulsion powder, wherein the chloride ion content in the desulfurized building gypsum is 1350-1500 mg/kg.
Liquid material: triethanolamine 0.09 parts and deionized water 115 parts.
7.2 the preparation method of plastering gypsum in comparative example 2:
s1: drying the desulfurized gypsum to constant weight at 50 ℃ to obtain dried desulfurized gypsum, grinding the dried desulfurized gypsum and sieving the dried desulfurized gypsum with a 140-target standard sieve, calcining the sieved desulfurized gypsum at 150 ℃ for 2.5 hours, cooling and aging for seven days to obtain desulfurized building gypsum.
S2: all the components in the powder are added into a stirring container and stirred for three minutes to uniformly disperse the components in the powder.
S3: and mixing and stirring the triethanolamine and deionized water uniformly to obtain a liquid material.
S4: and (3) adding the liquid material in the step (S3) into the uniformly dispersed powder material, and uniformly stirring the powder material and the liquid material to obtain the plastering gypsum.
2. Plastering gypsum performance detection results prepared in each example and comparative example
TABLE 1
From the detection results of the plastering gypsum reacted in table 1, the plastering gypsum added with the alcohol amine auxiliary agent in examples 1 to 5 and containing the desulfurized building gypsum, cement and mineral powder in the powder has higher water retention rate than that of the plastering gypsum in comparative example 1 and comparative example 2, which is beneficial to avoiding the phenomenon of moisture regain of the plastering gypsum in the later period. The tensile bond strength of examples 1 to 5 is significantly improved and the shrinkage is significantly reduced as compared with comparative examples 1 and 2, and the phenomena of hollowing and cracking of the plastering gypsum during use are suppressed.
The foregoing is merely a specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (16)

1. A plaster-on-plaster preform, comprising: powder and liquid, wherein,
the powder comprises desulfurized building gypsum, cement and mineral powder, the liquid material comprises alcohol amine auxiliary agents, the desulfurized building gypsum is obtained by calcining, cooling and aging the desulfurized building gypsum, the main component of the desulfurized building gypsum is calcium sulfate hemihydrate, the powder comprises 120-250 parts of the desulfurized building gypsum, 7.5-25 parts of the cement and 40-100 parts of the mineral powder in parts by weight, the liquid material comprises 0.09-0.40 part of the alcohol amine auxiliary agents, and the content of chloride ions in the desulfurized building gypsum is 500-2500 mg/kg.
2. The plaster gypsum plaster preform according to claim 1, characterized in that the chloride ion content is 800-2000 mg/kg.
3. The plaster preform according to claim 1, characterized in that said powder further comprises:
9-16 parts of cement, 0.18-0.55 part of retarder, 0.36-0.64 part of water-retaining agent, 3.96-7.07 parts of water reducer, 1.8-3.21 parts of waterproofing agent and 2.94-5.25 parts of redispersible latex powder.
4. A plaster preform according to claim 3, characterized in that the cement is Portland cement, having a strength grade of 42.5.
5. A plaster preform according to claim 3, characterized in that the mineral powder is a S95 type mineral powder.
6. A plaster gypsum preform according to claim 3, characterized in that the alcohol amine-based auxiliary is selected from one or more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, monoethyl diisopropanolamine.
7. A plaster preform according to claim 3, characterized in that the retarder is selected from any one of citric acid, sodium hexametaphosphate, PE gypsum retarder.
8. A prefabricated product of plastered gypsum according to claim 3, wherein the water retaining agent is selected from any one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
9. A preform of plastered gypsum according to claim 3, wherein the water reducing agent is selected from any one of polycarboxylate water reducing agents and naphthalene-based water reducing agents.
10. A plaster preform according to claim 3, characterized in that the waterproofing agent is a silicone waterproofing agent.
11. The preform of claim 1, wherein the liquid further comprises 115-148 parts of water, the liquid being a homogeneous mixture.
12. A method for preparing plastering gypsum, which is characterized by comprising the following steps:
providing a plaster gypsum prefabricated product, wherein the plaster gypsum prefabricated product comprises powder and liquid, the powder comprises desulfurized building gypsum, cement and mineral powder, the liquid comprises alcohol amine auxiliary agents, the desulfurized building gypsum is obtained by calcining, cooling and aging the desulfurized building gypsum, and the main component of the desulfurized building gypsum is calcium sulfate hemihydrate;
mixing the powder material and the liquid material, uniformly stirring to obtain the plastering gypsum,
the powder comprises 120-250 parts by weight of the desulfurized building gypsum, 7.5-25 parts by weight of cement and 40-100 parts by weight of mineral powder, the liquid comprises 0.09-0.40 part by weight of alcohol amine auxiliary agent of alcohol amine compound, and the content of chloride ions in the desulfurized building gypsum is 500-2500 mg/kg.
13. The method of preparing plasters according to claim 12, wherein the powder further comprises:
9-16 parts of cement, 0.18-0.55 part of retarder, 0.36-0.64 part of water-retaining agent, 3.96-7.07 parts of water reducer, 1.8-3.21 parts of waterproofing agent and 2.94-5.25 parts of redispersible latex powder.
14. The method for preparing plastering gypsum according to claim 12, wherein the liquid further comprises 115-148 parts of water, the liquid is a uniform mixture or the liquid comprises the water and the alcohol amine auxiliary agent which are packaged independently.
15. The method of preparing plastered gypsum according to claim 12, further comprising:
drying the desulfurized gypsum to constant weight at 40-60 ℃ to obtain dried desulfurized gypsum,
grinding the dried desulfurized gypsum and passing through a 140-target standard sieve,
calcining the screened desulfurized gypsum at 150-180 ℃ for 1.5-2.5 hours, cooling and aging to obtain the desulfurized building gypsum.
16. A plaster of paris, characterized in that it is produced by a method according to any of claims 12 to 15.
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