CN111620639A - Machine-sprayed heat-insulating layer plastering gypsum and preparation method thereof - Google Patents
Machine-sprayed heat-insulating layer plastering gypsum and preparation method thereof Download PDFInfo
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- CN111620639A CN111620639A CN201910268967.0A CN201910268967A CN111620639A CN 111620639 A CN111620639 A CN 111620639A CN 201910268967 A CN201910268967 A CN 201910268967A CN 111620639 A CN111620639 A CN 111620639A
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- phosphogypsum
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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
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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
- 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
- C04B2111/00577—Coating or impregnation materials applied by spraying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The application discloses machine spouts heat preservation plaster of plastering, machine spouts heat preservation plaster of plastering includes each component of following parts by weight: based on 100 parts of phosphogypsum, 1.5-5 parts of curing agent, 2-5 parts of retarder, 10-25 parts of water-retaining agent, 20-60 parts of construction sand, 15-50 parts of vitrified micro-beads, 0.1-0.5 part of pregelatinized starch, 600 parts of water and optionally accelerator. The application also provides a preparation method of the mechanical spraying heat-insulating layer plastering gypsum. This application has realized utilizing ardealite preparation machine to spout heat preservation gypsum that plasters. Various mechanical properties of the prepared mechanical spraying 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
Technical Field
The application relates to the field of building materials, in particular to machine-sprayed heat-insulating 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 heat-insulating layer plastering gypsum becomes a new bright point for the development of plastering materials for building interior walls. Utilize the machine to spout heat preservation plaster and join in marriage the quick-witted bottom layer that spouts, the machine spouts the surface course plaster and carries out the project of plastering of wall heat preservation, can effectively practice thrift the total cost of project for the engineering construction progress has become the urgent demand of large-scale building site. The machine-sprayed limestone paste is used for replacing lime mortar and cement mortar for plastering, which is a development trend of building wall decoration.
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 thermal insulation layer plastering gypsum prepared by using phosphogypsum and a preparation method thereof, opens up a new way for replacing building gypsum with phosphogypsum to produce machine-sprayed plastering gypsum, and successfully realizes resource utilization of the phosphogypsum. Various mechanical properties of the prepared mechanical spraying 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 spouts heat preservation plaster of plastering, machine spouts heat preservation plaster of plastering includes each component of following part by weight:
taking the pretreated phosphogypsum as 100 parts
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, 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 can pass through 50-200 mesh.
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 construction sand may be mixed with construction sand having a fineness of 80 mesh to 120 mesh and construction sand having a fineness of 40 mesh to 80 mesh.
In some embodiments, the weight fractions of the construction sand having the fineness of 80 mesh to 120 mesh and the construction sand having the fineness of 40 mesh to 80 mesh may be 10 to 30 and 10 to 30, respectively.
In some embodiments, the volume weight of the vitrified micro bubbles can be in the range of 100kg/m3-130kg/m3Preferably 115kg/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 of the material is reduced, the comprehensive performance is improved, and the 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 mechanical spraying heat-insulating layer plastering gypsum, which comprises the following steps:
adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining, aging and grinding to obtain the treated phosphogypsum;
uniformly mixing the treated phosphogypsum, a curing agent, an optional accelerator, a retarder, a water-retaining agent, building sand and pregelatinized starch to obtain plastering gypsum powder;
and uniformly mixing the plastering gypsum powder with water on a construction site to obtain the mechanical spraying heat insulation 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 50-200 mesh sieve.
In an embodiment of the preparation method, the pH of the phosphogypsum can be adjusted to 6.8-8 by quicklime powder, the calcining temperature can be 150-200 ℃, the time can be 1.5-4 hours, the aging time can be 24-72 hours, and the phosphogypsum can be ground to 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-soluble hydroxypropyl methylcellulose with a viscosity grade of 40000-.
In an embodiment of the preparation method, the water retention agent may be a slow-soluble hydroxypropyl methylcellulose with a viscosity grade of 60000-100000 pa.s.
In an embodiment of the preparation method, the construction sand may be mixed with construction sand having a fineness of 80 mesh to 120 mesh and construction sand having a fineness of 40 mesh to 80 mesh.
In an embodiment of the preparation method, the weight fractions of the construction sand having the fineness of 80 mesh to 120 mesh and the construction sand having the fineness of 40 mesh to 80 mesh may be 10 to 30 and 10 to 30, respectively.
In the embodiment of the preparation method, the volume weight range of the vitrified micro bubbles is 100-3Preferably 115kg/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 pregelatinized starch may have a viscosity of 300mpa.s to 1000mpa.s and a fineness of 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 mechanical spraying bottom layer plastering gypsum meet the requirements, and the problem that 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 collagen retarder, 12 parts by weight of hydroxypropyl methyl cellulose (HPMC) with the viscosity of 60000Pa.s, 15 parts by weight of 80-120-mesh building sand, 15 parts by weight of 40-80-mesh building sand, 50 parts by weight of vitrified micro-beads and 0.15 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 mechanical spraying heat insulation layer plastering gypsum capable of being constructed mechanically.
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, 10 parts by weight of 80-120-mesh building sand, 40 parts by weight of 40-80-mesh building sand, 25 parts by weight of vitrified micro-beads 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 mechanical spraying heat insulation layer plastering gypsum capable of being constructed mechanically.
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 the components, wherein 100 parts by weight of the 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 a protein gypsum retarder formed by calcifying degraded polyamide, 10 parts by weight of hydroxypropyl methyl cellulose (HPMC) with the viscosity of 100000Pa.s, 25 parts by weight of 80-120-mesh building sand, 25 parts by weight of 40-80-mesh building sand, 30 parts by weight of vitrified micro-beads 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 mechanical spraying heat insulation layer plastering gypsum capable of being constructed mechanically.
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 salt of degraded polyamide, 20 parts by weight of hydroxypropyl methyl cellulose (HPMC) with viscosity of 100000Pa.s, 30 parts by weight of 80-120-mesh building sand, 20 parts by weight of 40-80-mesh building sand, 40 parts by weight of vitrified micro-beads and 0.40 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 mechanical spraying heat insulation layer plastering gypsum capable of being constructed mechanically.
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 a protein gypsum retarder formed by calcium-adding degraded polyamide, 10 parts by weight of hydroxypropyl methylcellulose (HPMC) with the viscosity of 100000Pa.s, 20 parts by weight of 80-120 meshes of building sand, 30 parts by weight of 40-80 meshes of building sand, 50 parts by weight of vitrified micro-beads and 0.45 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 mechanical spraying heat insulation layer plastering gypsum capable of being constructed mechanically.
Performance testing
The performance of the mechanical spray insulation layer plastering gypsum prepared in the above embodiment is detected according to the national standard GB/T28627-2012 plastering gypsum, and the detection result is shown in Table 1.
TABLE 1 Properties of plastering Gypsum prepared in examples 1 to 5 of the present application
It can be seen that the mechanical spraying heat-insulating layer plastering gypsum prepared by 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; the thermal conductivity is in the range of 0.15W/(m.K) -0.21W/(m.K).
GB/T28627-2012 plastering gypsum has no requirement on the breaking strength and tensile bonding strength of the plastering gypsum of the heat-insulating layer.
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 heat-insulating 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 thermal insulation layer plastering gypsum of claim 1, wherein the curing agent is selected from any one or more of a fluorosilicate curing agent and an amine curing agent,
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 thermal insulation layer 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 thermal insulation layer 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 thermal insulation plastering gypsum of claim 1, wherein the pregelatinized starch can be any one or more selected from the group consisting of pregelatinized starches of tapioca starch, potato starch and corn starch.
6. The machine-sprayed heat-insulating layer plastering gypsum of claim 5, wherein the viscosity of the pregelatinized starch is 300-1000 mpa.s, and the fineness is 50-100 meshes.
7. The method of making machine-sprayed insulation layer plastered gypsum of any one of claims 1 to 6, the method comprising:
pre-treating phosphogypsum: adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining, aging and grinding to obtain pretreated phosphogypsum;
uniformly mixing the pretreated phosphogypsum, a curing agent, a retarder, a water-retaining agent, construction sand, 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 mechanical spraying heat insulation 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 50-200 meshes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101597147A (en) * | 2009-07-06 | 2009-12-09 | 贵州安捷能建筑材料发展有限公司 | The processing method of a kind of phosphogypsum, desulphurization gypsum for preparing high strength plaster of Paris |
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| JP2017166174A (en) * | 2016-03-15 | 2017-09-21 | 株式会社ノザワ | Sprayed heat insulation material and installation method thereof |
| CN108002792A (en) * | 2017-12-01 | 2018-05-08 | 泰州普利策新材料科技有限公司 | A kind of machine spray type inorganic heat preservation anticracking grout and its construction method |
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| CN105688362A (en) * | 2016-01-18 | 2016-06-22 | 四川大学 | Stabilizing agent for phosphogypsum and method for innocent treatment of phosphogypsum |
| JP2017166174A (en) * | 2016-03-15 | 2017-09-21 | 株式会社ノザワ | Sprayed heat insulation material and installation method thereof |
| CN108002792A (en) * | 2017-12-01 | 2018-05-08 | 泰州普利策新材料科技有限公司 | A kind of machine spray type inorganic heat preservation anticracking grout and its construction method |
| CN108191371A (en) * | 2018-03-15 | 2018-06-22 | 云南云天任高实业有限公司 | A kind of ardealite base machine spray thermal insulation mortar and preparation method thereof |
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