CN111620640A - Machine-sprayed light-weight bottom layer plastering gypsum and preparation method thereof - Google Patents

Machine-sprayed light-weight bottom layer plastering gypsum and preparation method thereof Download PDF

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Publication number
CN111620640A
CN111620640A CN201910274182.4A CN201910274182A CN111620640A CN 111620640 A CN111620640 A CN 111620640A CN 201910274182 A CN201910274182 A CN 201910274182A CN 111620640 A CN111620640 A CN 111620640A
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China
Prior art keywords
phosphogypsum
plastering gypsum
machine
sprayed
plastering
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CN201910274182.4A
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Chinese (zh)
Inventor
尹东杰
王鹏起
简铭
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Beijing New Building Material Group Co Ltd
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Beijing New Building Material Group Co Ltd
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Priority to CN201910274182.4A priority Critical patent/CN111620640A/en
Publication of CN111620640A publication Critical patent/CN111620640A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/143—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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00508—Cement paints
    • 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
    • C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The application discloses machine spouts light bottom plaster of plastering, machine spouts light bottom plaster of plastering includes: based on 100 parts of pretreated phosphogypsum, 1.5-5 parts of curing agent, 2-5 parts of retarder, 10-25 parts of water-retaining agent, 20-40 parts of vitrified micro-bead, 0.1-0.5 part of pregelatinized starch, 400 parts of water and 600 parts of accelerator optionally. The application also provides a preparation method of the machine-sprayed lightweight bottom layer plastering gypsum. The mechanical properties of the prepared machine-sprayed light-weight bottom layer plastering gypsum meet the requirements, and the problem that the common plastering gypsum cannot be mechanically constructed is solved; the mechanical plastering replaces manual plastering, so that the construction efficiency can be greatly improved, and the construction period can be shortened; the construction process is simple.

Description

Machine-sprayed light-weight bottom layer plastering gypsum and preparation method thereof
Technical Field
The application relates to but is not limited to the field of building materials, in particular to but not limited to machine-sprayed light-weight bottom layer plastering gypsum and a preparation method thereof.
Background
Plastering gypsum is a novel leveling material which develops rapidly in recent years, is mainly a plastering material prepared by taking gypsum as a main cementing material and adding admixtures, additives and the like, and is widely applied to leveling and decorating inner walls and roofs. In the building engineering, the plastering gypsum has good workability, fluidity, water retention, heat preservation and insulation performance and proper fireproof performance. The wall surface after plastering gypsum is smeared is compact and flat, and the indoor humidity can be adjusted. Therefore, the plastering gypsum is a wall plastering leveling material with good material performance, construction performance and use function, and is widely applied to industrial and civil buildings.
In recent years, machine-sprayed light-weight bottom layer plastering gypsum is a new variety of plastering gypsum, is mainly used for a wall surface leveling layer, has the function of supplementing and saving energy for the inner side of an outer wall, a household wall and a ceiling, and is a new bright point in the development of plastering materials for building inner walls.
When preparing plastering gypsum, at present, natural gypsum and desulfurized gypsum are used as more gypsum sources, and less phosphogypsum is used. The phosphogypsum is an industrial byproduct in the process of preparing phosphoric acid by a wet method, about 5 tons of phosphogypsum are generated when 1 ton of phosphoric acid is produced, and the accumulated storage amount of the phosphogypsum in China currently exceeds 3 hundred million tons. Particularly, as the year is 2018, the country collects 25 yuan/ton of solid waste environment protection tax to pollution discharge enterprises, so that the utilization of the phosphogypsum, a regenerated gypsum resource, is not slow.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides machine-sprayed light bottom layer plastering gypsum prepared by using phosphogypsum and a preparation method thereof, opens up a new way for replacing the machine-sprayed light bottom layer plastering gypsum for producing building gypsum by using the phosphogypsum, and successfully realizes the resource utilization of the phosphogypsum. Various mechanical properties of the prepared machine-sprayed light-weight bottom layer plastering gypsum meet the requirements, and the problem that the common plastering gypsum cannot be mechanically constructed is solved; the mechanical plastering replaces manual plastering, so that the construction efficiency can be greatly improved, and the construction period can be shortened; the construction process is simple.
Specifically, the application provides a machine-sprayed light bottom layer plastering gypsum, which comprises the following components in parts by weight:
based on 100 parts of the pretreated phosphogypsum,
and optionally, an accelerator.
In some embodiments, the phosphogypsum may be a phosphogypsum pre-treated by: adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining for a while, aging and grinding.
In some embodiments, the pH of phosphogypsum can be adjusted to 6.8-8 with quicklime powder. Soluble P in quicklime powder CaO and phosphogypsum2O5、F-The reaction is carried out to generate inert substances, and the harm of soluble phosphorus and fluorine can be eliminated.
In some embodiments, quicklime powder may be used in an amount of 0.2% to 1.0% by weight of the phosphogypsum.
In some embodiments, the temperature of the calcination may be from 150 ℃ to 200 ℃ and the time may be from 1.5 to 4 hours.
In some embodiments, the aging time may be from 24 to 72 hours.
In some embodiments, the mill may be ground until the phosphogypsum passes through a 50-200 mesh screen.
In some embodiments, the pH of phosphogypsum may be adjusted to 6.8-8 with quicklime powder, which may be used in an amount of 0.2-1.0% by weight of the phosphogypsum, the calcination temperature may be 150-200 ℃, the time may be 1.5-4 hours, the aging time may be 24-72 hours, and the milling may be milling until the phosphogypsum can pass through a 50-200 mesh sieve.
In some embodiments, the curing agent may be selected from any one or more of fluorosilicate-based curing agents and amine-based curing agents.
In some embodiments, the fluorosilicate-based curing agent may be selected from any one or more of magnesium fluorosilicate, zinc fluorosilicate, calcium fluorosilicate, and sodium fluorosilicate.
In some embodiments, the amine-based curing agent may be selected from any one or more of 4, 4' -diaminodiphenylmethane, triethylene tetramine, diethylene triamine, N-methylol acrylamide, polypropylene aniline, m-phenylenediamine, and tetraethyl ammonium bromide.
When the curing agent is an amine curing agent, the plastering gypsum further comprises an accelerator. In some embodiments, the promoter may be selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, t-butanol, isobutanol, and cyclohexanol.
In some embodiments, the weight ratio of the amine-based curing agent to the accelerator may be 1: 0.5 to 1.
In some embodiments, the set retarder may be selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based set retarders.
In some embodiments, the protein-based retarder may be selected from any one or more of a bone cement protein retarder and a protein-based gypsum retarder in which degraded polyamide is calcium-salted.
In some embodiments, the water retaining agent may be selected from any one or more of hydroxypropyl methylcellulose (HPMC), carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.
In some embodiments, the water retaining agent may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000pa.s to 200000 pa.s.
In some embodiments, the water retaining agent may be a slow dissolving hydroxypropyl methylcellulose having a viscosity grade of 60000pa.s to 100000 pa.s.
In some embodiments, the volume weight of the vitrified micro bubbles can be in the range of 100kg/m3-130kg/m3. The vitrified micro bubbles are used as lightweight aggregate, so that the flowability and the self-resistance strength of the plastering gypsum can be improved, the drying shrinkage rate is reduced, the comprehensive performance is improved, and the comprehensive production cost is reduced.
In some embodiments, the pregelatinized starch may be any one or more of pregelatinized starches selected from the group consisting of tapioca starch, potato starch, and corn starch.
In some embodiments, the pregelatinized starch can have a viscosity of 300mpa.s to 1000mpa.s and a fineness of 50 mesh to 100 mesh. According to the application, the pregelatinized starch is used in the formula for preparing the plastering gypsum by utilizing the pretreated phosphogypsum, the plastering gypsum has stronger bonding property, better linkage transition with the bottom layer and the surface layer of the wall surface and good wall surface integrity.
The application also provides a preparation method of the machine-sprayed lightweight bottom layer plastering gypsum, which comprises the following steps:
uniformly mixing the treated phosphogypsum, a curing agent, an optional accelerator, a retarder, a water-retaining agent, vitrified micro bubbles and pregelatinized starch to obtain plastering gypsum powder;
and uniformly mixing the plastering gypsum powder with water on a construction site to obtain the machine-sprayed light-weight bottom layer plastering gypsum.
In an embodiment of the preparation method, the pH of phosphogypsum can be adjusted to 6.8-8 with quicklime powder.
In an embodiment of the preparation method, the temperature of the calcination may be 150 ℃ to 200 ℃ and the time may be 1.5 to 4 hours.
In an embodiment of the preparation method, the aging time may be 24 to 72 hours.
In an embodiment of the preparation method, the mill may be a mill until the phosphogypsum can pass through a 80 mesh sieve.
In an embodiment of the preparation method, the pH of the phosphogypsum may be adjusted to 6.8-8 with quicklime powder, the calcination temperature may be 150-200 ℃, the time may be 1.5-4 hours, the aging time may be 24-72 hours, and the grinding may be grinding until the phosphogypsum can pass through a 50-200 mesh sieve.
In an embodiment of the production method, the curing agent may be selected from any one or more of fluorosilicate-based curing agents and amine-based curing agents.
In an embodiment of the production method, the fluorosilicate-based curing agent may be selected from any one or more of magnesium fluorosilicate, zinc fluorosilicate, calcium fluorosilicate, and sodium fluorosilicate.
In an embodiment of the preparation method, the amine-based curing agent may be selected from any one or more of 4, 4' -diaminodiphenylmethane, triethylene tetramine, diethylene triamine, N-methylol acrylamide, polypropylene aniline, m-phenylenediamine and tetraethyl ammonium bromide.
When the curing agent is an amine curing agent, the plastering gypsum further comprises an accelerator. In some embodiments, the promoter may be selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, t-butanol, isobutanol, and cyclohexanol.
In an embodiment of the preparation method, the weight ratio of the amine curing agent to the accelerator may be 1: 0.5-1.
In an embodiment of the method of making, the retarder may be selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based retarders.
In an embodiment of the preparation method, the protein-based retarder may be any one or more selected from the group consisting of a bone collagen protein retarder and a protein-based gypsum retarder in which degraded polyamide is calcium-salted.
In an embodiment of the preparation method, the water retaining agent may be selected from any one or more of hydroxypropylmethylcellulose, carboxymethylhydroxyethylcellulose, hydroxypropylcellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate and ammonium polyacrylate.
In an embodiment of the preparation method, the water retention agent may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000pa.s to 200000 pa.s.
In an embodiment of the preparation method, the water retaining agent may be a slow-dissolving hydroxypropylmethylcellulose having a viscosity grade of 60000pa.s-100000 pa.s.
In an embodiment of the manufacturing method, the volume weight range of the vitrified small bubbles may be 100kg/m3-130kg/m3。
In an embodiment of the preparation method, the pregelatinized starch may be any one or more selected from the group consisting of pregelatinized starches of tapioca starch, potato starch and corn starch.
In an embodiment of the preparation method, the viscosity of the pregelatinized starch may be 300mpa.s to 1000mpa.s, and the fineness may be 50 mesh to 100 mesh.
The application adopts the phosphogypsum to prepare the plastering gypsum, and realizes the reutilization of the phosphogypsum which is a solid waste. Because the phosphogypsum contains more harmful impurities, part of the harmful impurities in the phosphogypsum are removed by neutralizing, calcining and aging the phosphogypsum, and then the curing agent is added, so that after the curing agent acts on the phosphogypsum, the damage and the damage of impurity ions to an electric double layer structure between gypsum particles can be effectively prevented, and the exchange activity of the impurity ions is limited. The chemical force generated by the curing agent can seal the diffusion path of impurity ions, so that the cohesive force of gypsum particles is enhanced, the phosphogypsum is cemented and cured in the process of coagulating and hardening in water and is not permeated and diffused out of the phosphogypsum any more, so that the phosphogypsum can reach the national standard of building gypsum, and can replace the traditional natural gypsum and desulfurized gypsum to produce plastering gypsum. Meanwhile, various mechanical properties of the prepared machine-sprayed light-weight bottom layer plastering gypsum meet the requirements, and the problem that the common plastering gypsum cannot be mechanically constructed is solved; the mechanical plastering replaces manual plastering, so that the construction efficiency can be greatly improved, and the construction period can be shortened; the construction process is simple.
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. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof.
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 starting materials used in the following examples are all common commercial products.
Example 1
Step 1: adjusting the pH value of the phosphogypsum powder to 6.8 by using quicklime powder accounting for 0.3 percent of the weight of the phosphogypsum.
Step 2: calcining the neutralized phosphogypsum powder in a muffle furnace at 160 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 32%.
And step 3: weighing the components, wherein 100 parts by weight of the phosphogypsum powder obtained in the step 2, 1.5 parts by weight of magnesium fluosilicate, 450 parts by weight of water, 2.3 parts by weight of a bone glue protein retarder, 12 parts by weight of hydroxypropyl methyl cellulose (HPMC) with the viscosity of 60000Pa.s, and 115kg/m326 parts of vitrified micro bubbles and 0.15 part of pregelatinized starch.
And 4, step 4: and (3) uniformly mixing the phosphogypsum powder obtained in the step (2), a curing agent, a retarder, hydroxypropyl methyl cellulose (HPMC), vitrified micro bubbles and pregelatinized starch to obtain the plastering gypsum powder.
And 5: and mixing the mixed plastering gypsum powder with water on a construction site to obtain the mechanically-sprayed light-weight bottom plastering gypsum capable of being mechanically constructed.
Example 2
Step 1: adjusting the pH value of the phosphogypsum powder to 7.2 by using quicklime powder accounting for 0.5 percent of the weight of the phosphogypsum.
Step 2: calcining the neutralized phosphogypsum powder in a muffle furnace at 180 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 30 percent.
And step 3: weighing 100 parts by weight of phosphogypsum powder obtained in the step 2, 2.8 parts by weight of sodium fluosilicate, 500 parts by weight of water, 4.6 parts by weight of protein gypsum retarder formed by calcifying degraded polyamide, 15 parts by weight of hydroxypropyl methyl cellulose (HPMC) with the viscosity of 80000Pa.s, 28 parts by weight of vitrified micro-beads of 118kg/m3 and 0.35 part by weight of pregelatinized starch.
And 4, step 4: and (3) uniformly mixing the phosphogypsum powder obtained in the step (2), a curing agent, a retarder, hydroxypropyl methyl cellulose (HPMC), construction sand and pregelatinized starch to obtain the plastering gypsum powder.
And 5: and mixing the mixed plastering gypsum powder with water on a construction site to obtain the mechanically-sprayed light-weight bottom plastering gypsum capable of being mechanically constructed.
Example 3
Step 1: adjusting the pH value of the phosphogypsum powder to 7.8 by using quicklime powder accounting for 0.8 percent of the weight of the phosphogypsum.
Step 2: calcining the neutralized phosphogypsum powder in a muffle furnace at 160 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 33 percent.
And step 3: weighing 100 parts by weight of phosphogypsum powder obtained in the step 2, 3.5 parts by weight of calcium fluosilicate, 550 parts by weight of water, 4.0 parts by weight of protein gypsum retarder formed by calcifying degraded polyamide, 10 parts by weight of hydroxypropyl methylcellulose (HPMC) with viscosity of 100000Pa.s and 120kg/m330 parts of vitrified micro bubbles and 0.35 part of pregelatinized starch.
And 4, step 4: and (3) uniformly mixing the phosphogypsum powder obtained in the step (2), a curing agent, a retarder, hydroxypropyl methyl cellulose (HPMC), construction sand and pregelatinized starch to obtain the plastering gypsum powder.
And 5: and mixing the mixed plastering gypsum powder with water on a construction site to obtain the mechanically-sprayed bottom layer plastering gypsum capable of being mechanically constructed.
Example 4
Step 1: adjusting the pH value of the phosphogypsum powder to 7.8 by using quicklime powder accounting for 0.5 percent of the weight of the phosphogypsum.
Step 2: calcining the neutralized phosphogypsum powder in a muffle furnace at 190 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 33 percent.
And step 3: weighing the components, wherein 100 parts by weight of the phosphogypsum powder obtained in the step 2, 1.6 parts by weight of N-hydroxymethyl acrylamide, 1.0 part by weight of salicylic acid, 550 parts by weight of water, 4.5 parts by weight of protein gypsum retarder formed by calcium-adding degraded polyamide, 20 parts by weight of hydroxypropyl methylcellulose (HPMC) with viscosity of 100000Pa.s, and 138kg/m340 parts of vitrified micro bubbles and 0.40 part of pregelatinized starch.
And 4, step 4: and (3) uniformly mixing the phosphogypsum powder obtained in the step (2), a curing agent, a retarder, hydroxypropyl methyl cellulose (HPMC), construction sand and pregelatinized starch to obtain the plastering gypsum powder.
And 5: and mixing the mixed plastering gypsum powder with water on a construction site to obtain the mechanically-sprayed light-weight bottom plastering gypsum capable of being mechanically constructed.
Example 5
Step 1: adjusting the pH value of the phosphogypsum powder to 7.5 by using quicklime powder accounting for 0.8 percent of the weight of the phosphogypsum.
Step 2: calcining the neutralized phosphogypsum powder in a muffle furnace at 200 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 33 percent.
And step 3: weighing the components, wherein 100 parts by weight of the phosphogypsum powder obtained in the step 2, 5 parts by weight of triethylene tetramine, 3.8 parts by weight of ethanol, 550 parts by weight of water, 4.0 parts by weight of protein gypsum retarder formed by calcium-calcified degraded polyamide, 10 parts by weight of hydroxypropyl methylcellulose (HPMC) with the viscosity of 100000Pa.s, and 130kg/m335 parts of vitrified micro bubbles and 0.45 part of pregelatinized starch.
And 4, step 4: and (3) uniformly mixing the phosphogypsum powder obtained in the step (2), a curing agent, a retarder, hydroxypropyl methyl cellulose (HPMC), construction sand and pregelatinized starch to obtain the plastering gypsum powder.
And 5: and mixing the mixed plastering gypsum powder with water on a construction site to obtain the mechanically-sprayed light-weight bottom plastering gypsum capable of being mechanically constructed.
Performance testing
The performance of the machine-sprayed light-weight bottom layer plastering gypsum prepared in the above embodiments is detected according to the national standard GB/T28627-2012 plastering gypsum, and the detection results are shown in table 1.
TABLE 1 Properties of plastering Gypsum prepared in examples 1 to 5
It can be seen that the machine-sprayed lightweight bottom layer plastering gypsum prepared in the embodiment of the application has high water retention rate, which indicates that almost no bleeding exists; the slurry has higher tensile bonding strength, which indicates that the working performance is good and the slurry has higher cohesiveness; the initial setting time is more than 1 hour, the final setting time is less than 8 hours, and the flexural strength, the compressive strength and the tensile bonding strength all meet the requirements of relevant standards.
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 (11)

1. The machine-sprayed light bottom layer plastering gypsum comprises the following components in parts by weight:
based on 100 parts of the pretreated phosphogypsum,
and optionally, an accelerator.
2. The machine-sprayed lightweight plastering gypsum of claim 1, wherein the curing agent is selected from any one or more of fluorosilicate-based curing agents and amine-based curing agents,
the fluorosilicate curing agent is selected from any one or more of magnesium fluorosilicate, zinc fluorosilicate, calcium fluorosilicate and sodium fluorosilicate,
the amine curing agent is selected from any one or more of 4, 4' -diaminodiphenylmethane, triethylene tetramine, diethylene triamine, N-methylol acrylamide, polypropylene aniline, m-phenylenediamine and tetraethyl ammonium bromide.
3. The machine-sprayed lightweight bottom plastering gypsum of claim 2, wherein when the curing agent is an amine curing agent, the plastering gypsum further comprises an accelerator,
the promoter is selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, tert-butanol, isobutanol and cyclohexanol.
4. The machine-sprayed lightweight bottom plastering gypsum of claim 3, wherein the weight ratio of the amine curing agent to the accelerator is 1: 0.5-1.
5. The machine-sprayed lightweight bottom plastering gypsum of claim 1, wherein the set retarder is selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based set retarders,
the water retention agent is selected from any one or more of hydroxypropyl methyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate and ammonium polyacrylate,
the pregelatinized starch is any one or more of pregelatinized starch selected from tapioca starch, potato starch and corn starch.
6. The machine-sprayed lightweight bottom plastering gypsum of claim 5, wherein the protein-based retarder is selected from any one or more of a bone cement protein retarder and a protein-based gypsum retarder obtained by calcium-calcifying degraded polyamide,
the water-retaining agent is slowly soluble hydroxypropyl methyl cellulose with the viscosity grade of 40000Pa.s-200000Pa.s,
the viscosity of the pregelatinized starch is 300-1000 mpa.s, and the fineness is 50-100 meshes.
7. A method of making a machine-sprayed lightweight render plaster according to any of claims 1-6, the method of making comprising:
pre-treating phosphogypsum: adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining, aging and grinding to obtain the treated phosphogypsum;
uniformly mixing the pretreated phosphogypsum, a curing agent, a retarder, a water-retaining agent, pregelatinized starch and an optional accelerator to obtain plastering gypsum powder;
and uniformly mixing the plastering gypsum powder with water on a construction site to obtain the machine-sprayed light-weight bottom layer plastering gypsum.
8. A method of preparation according to claim 7, where the pH of the phosphogypsum is adjusted to 6.8-8 with quicklime powder,
the weight of the quicklime powder is 0.2-1.0% of that of the phosphogypsum.
9. The preparation method according to claim 7, wherein the temperature of the calcination is 150 ℃ to 200 ℃ and the time of the calcination is 1.5 to 4 hours.
10. The preparation method according to claim 7, wherein the aging time is 24 to 72 hours.
11. The plastering gypsum of claim 7, wherein the flour mill is ground until the phosphogypsum passes through a 50-200 mesh sieve.
CN201910274182.4A 2019-04-04 2019-04-04 Machine-sprayed light-weight bottom layer plastering gypsum and preparation method thereof Pending CN111620640A (en)

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CN112390611A (en) * 2021-01-19 2021-02-23 佛山市南海宇诚装饰材料有限公司 High-strength sound-absorbing ceiling and preparation method thereof
CN113354377A (en) * 2021-05-25 2021-09-07 重庆大学 Lightweight plastering gypsum prepared from mirabilite gypsum and preparation method thereof

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CN112390611A (en) * 2021-01-19 2021-02-23 佛山市南海宇诚装饰材料有限公司 High-strength sound-absorbing ceiling and preparation method thereof
CN113354377A (en) * 2021-05-25 2021-09-07 重庆大学 Lightweight plastering gypsum prepared from mirabilite gypsum and preparation method thereof

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