CN112341022A - Bottom layer plastering gypsum for regenerative building and preparation method thereof - Google Patents

Bottom layer plastering gypsum for regenerative building and preparation method thereof Download PDF

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CN112341022A
CN112341022A CN202011328060.8A CN202011328060A CN112341022A CN 112341022 A CN112341022 A CN 112341022A CN 202011328060 A CN202011328060 A CN 202011328060A CN 112341022 A CN112341022 A CN 112341022A
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gypsum
powder
plastering
reducing agent
bottom layer
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陈群
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Zhejiang Zhuangshuo Building Materials Co ltd
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Zhejiang Zhuangshuo Building Materials Co ltd
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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
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than 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
    • C04B11/00—Calcium sulfate cements
    • C04B11/005—Preparing or treating the raw materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/007—After-treatment of the dehydration products, e.g. aging, stabilisation
    • 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
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • 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
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a bottom layer plastering gypsum for a regeneration building and a preparation method thereof, and the bottom layer plastering gypsum comprises 100-200 parts of salt gypsum, 10-20 parts of a dissolution accelerator and 50-60 parts of an enhanced additive, wherein the dissolution accelerator comprises heptasodium diethylenetriamine penta (methylene phosphonic acid), potassium formate and zeolite powder, and the mass ratio of the heptasodium diethylenetriamine penta (methylene phosphonic acid), the potassium formate and the zeolite powder is 1: 2: the reinforced admixture comprises a retarder, latex powder, a water reducing agent, Portland cement, vitrified micro bubbles and diatomite, wherein the mass of the Portland cement is 50-60% of that of the reinforced admixture, the water retention property is good, the wall surface is tightly combined, and peculiar smell in air is eliminated.

Description

Bottom layer plastering gypsum for regenerative building and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to bottom layer plastering gypsum for a regenerative building 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 and leveling material with good material performance, construction performance and use function, and is widely applied to industrial and civil buildings.
The salt gypsum is waste residue produced in salt industry, the main component of the salt gypsum is calcium sulfate dihydrate containing a large amount of sodium chloride, the plastering gypsum is a high-efficiency and energy-saving plastering leveling material for building interior walls and ceilings, which takes gypsum as a main cementing material, compared with the cement plastering material, the plastering material has low volume weight, only half of the traditional cement plastering material, the building load can be effectively reduced, the plastering gypsum is divided into bottom plastering gypsum, surface plastering gypsum, light bottom plastering gypsum and heat-insulating layer plastering gypsum, the preparation of the bottom plastering gypsum by using the salt gypsum not only can fully utilize industrial solid wastes, solve the problems of environment and water pollution caused by the salt gypsum, but also fills new vitality for the continuous development of the gypsum industry.
However, because the evaporation rate of the salt gypsum is high in the salt making process, the nucleation rate of calcium sulfate is high, the granularity of precipitated gypsum is small, the median particle size is about 4-6 microns, and the specific surface area is large, the salt gypsum is very difficult to separate sodium chloride by washing, and meanwhile, because the content of chloride ions is high, the salt gypsum can be combined with calcium ions in the gypsum to form calcium chloride, the calcium chloride is very easy to absorb water and damp, and the plastering gypsum has the phenomena of moisture regain, yellowing and the like, so that the salt gypsum is difficult to recycle.
The strength of the regenerated gypsum is reduced by about 50 percent compared with the original gypsum, the water absorption rate of the regenerated gypsum is increased by about 40 percent, the 2h strength of the regenerated gypsum is lower than 1.73MPa, and the compressive strength of the regenerated gypsum is lower than 2.9MPa, which do not meet the standard requirements, so the regenerated gypsum can not be reused as building gypsum, and the reason that the existing regenerated gypsum including the salt gypsum is mainly used as a soil conditioner or a cement additive and is hardly utilized as a building product is also provided.
In the prior art, patent number CN201911284592.3 discloses a bottom layer plastering gypsum and a preparation method thereof, which improve hydration and hardening characteristics of well salt gypsum by activating the well salt gypsum, thereby improving hydration rate and hardening strength of the bottom layer plastering gypsum, and solving the problems of large amount of idle stockpiling of well salt gypsum and no gelation of well salt gypsum, but the water retention of the well salt gypsum still needs to be improved, and the salt gypsum is not desalted, the gypsum has small granularity and large specific surface area, and the more water is needed in actual use, the belt is coagulated and dried, the more pores are left after water evaporation, the less dense gypsum is caused, and the problem of poor physical properties such as strength reduction is caused.
Disclosure of Invention
In order to solve the problems, the invention provides the bottom layer plastering gypsum for the regeneration building and the preparation method thereof, which realize the reutilization of the salt gypsum, have good water retention property, are tightly combined with the wall surface and eliminate the peculiar smell in the air.
The technical scheme for solving the problem is that the bottom layer plastering gypsum for the regeneration building comprises 100-200 parts of salt gypsum, 10-20 parts of a dissolution promoter and 50-60 parts of an enhanced additive, wherein the dissolution promoter comprises heptasodium diethylenetriamine penta (methylene phosphonic acid), potassium formate and zeolite powder, and the mass ratio of the heptasodium diethylenetriamine penta (methylene phosphonic acid), the potassium formate and the zeolite powder is 1: 2: the reinforcing admixture comprises a retarder, latex powder, a water reducing agent, Portland cement, vitrified micro bubbles and diatomite, wherein the mass of the Portland cement is 50-60% of that of the reinforcing admixture.
Preferably, the retarder is sodium tripolyphosphate, the mass of the retarder is 1-5% of that of the enhancing additive, the setting time of the plastering gypsum is required to be longer due to operation requirements, the initial setting time is not less than 1h, the final setting time is not more than 8h, the retarder is required to be added to the prepared plastering gypsum, the sodium tripolyphosphate covers the gypsum surface to inhibit the dissolution of the gypsum through forming calcium phosphate insoluble salt, and a chemical adsorption layer is formed on the surface of a dihydrate gypsum crystal nucleus to inhibit the growth of the crystal nucleus to realize the retarding effect on the gypsum.
Preferably, the latex powder is at least one of ethylene and vinyl acetate copolymer rubber powder, vinyl acetate and vinyl versatate copolymer rubber powder, acrylate copolymer rubber powder, styrene and acrylate copolymer rubber powder, the latex powder is 10-20% of the enhanced additive, the enhanced additive is used as a plastering material, plastering gypsum has enough bonding strength, and the bonding effect can be enhanced by adding the latex powder, the latex powder is redispersible latex powder, the redispersible latex powder is rapidly dispersed and formed into a film after contacting with water, the cohesive force of the gypsum is increased by using the adhesive, the compressive strength and the tensile bonding strength of the gypsum are improved, the polymer is deposited on the crystal surface of the dihydrate gypsum, the free water is gradually reduced along with the process of setting and hardening, the distances among the latex powder particles are reduced, and the latex powder particles are finally contacted and connected with each other to form a continuous and compact film, it has a low elastic modulus, and can disperse stress and inhibit the formation of microcrack when the hardened body is stressed, so that the tensile bonding property of the gypsum can be improved.
Preferably, the water reducing agent is a polycarboxylate water reducing agent, the quality of the polycarboxylate water reducing agent is 5-10% of that of the reinforcing additive, and as the retarder and the water-retaining agent are added in the scheme, the retarder and the water-retaining agent can both increase the standard consistency water demand of the bottom plastering gypsum, so that the strength of the obtained bottom plastering gypsum is reduced, and the polycarboxylate water reducing agent realizes the water reducing effect through electrostatic repulsion and steric hindrance.
Preferably, the mass ratio of the retarder to the diatomite to the water reducing agent is 4: 2: 1.
further, a preparation method of the recycled building bottom layer plastering gypsum is also provided, and comprises the following steps:
s1, roasting zeolite powder, cooling, mixing with heptasodium diethylenetriamine penta (methylene phosphonic acid) and potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, uniformly mixing the retarder, the latex powder, the water reducing agent, the portland cement, the vitrified micro bubbles and the diatomite to obtain an enhanced additive, press-filtering the gypsum slurry, crushing and ball-milling the gypsum slurry to obtain gypsum powder, mixing the gypsum powder and the enhanced additive, calcining and aging to obtain the bottom layer plastering gypsum for the regeneration building.
Preferably, in the step S1, the calcination temperature of the zeolite powder is 180-200 ℃, and the calcination time is 1-2 h.
Preferably, in the step S2, the particle size of the gypsum powder is 0.1-0.4 mm.
Preferably, in the step S2, the calcination temperature is 160-180 ℃, the calcination time is 3-5h, the aging temperature is 20-30 ℃, and the aging time is 2-3 h.
In the scheme, waste salt gypsum is used as a raw material, the waste salt gypsum is pretreated by zeolite powder and a dissolution promoter, the zeolite powder has a frame structure, a plurality of cavities are arranged in a crystal, and the volume of a pore passage accounts for about 50% of the volume of a zeolite sphere, so that the zeolite has strong adsorption capacity and can adsorb chloride ions in the material, meanwhile, the zeolite powder contains a certain amount of active silica and silicon sesquioxide, and can react with doped calcium hydroxide to generate a reticular C-S-H gel, the C-S-H gel is dispersedly distributed on the surface of the gypsum crystal to improve the strength of plastering gypsum, meanwhile, the C-S-H gel has a large internal specific surface area and strong adsorption and solidification capacity on the chloride ions, and can effectively prevent the chloride ions from migrating in the hardening slurry of the plastering gypsum, and on the other hand, the heptasodium diethylenetriamine pentamethylenephosphonic acid in the dissolution promoter can effectively reduce the migration of the sodium chloride crystals on the surface of calcium sulfate dihydrate The adhesion force is accelerated, the sodium chloride on the surface of the calcium sulfate dihydrate is desorbed by the heptasodium diethylenetriamine pentamethylene phosphonic acid, the sodium chloride is dissolved in the potassium formate solution, meanwhile, the zeolite adsorbs chloride ions dissolved in the formic acid solution, the saturation of the sodium chloride in the formic acid solution is reduced, the dissolution of the sodium chloride on the surface of the calcium sulfate dihydrate is further accelerated, the zeolite adsorbs chloride ions contained in the internal structure of the calcium sulfate dihydrate, the sodium chloride on the surface and in the calcium sulfate dihydrate is completely dissolved out, the salt gypsum is desalted and then used as a raw material for preparing the bottom layer plastering gypsum, if the desalting is not thorough, the gypsum has small granularity and large specific surface area, and the water requirement is increased in actual use, the belt is condensed and dried, and the more pores left after water evaporation, the less dense gypsum is caused, and the problem of poor physical properties such as strength reduction and the like is caused;
in the scheme, after the treated salt gypsum is desalted, the reinforcing additive is added to prepare the bottom layer plastering gypsum, so that the water retention property, the mechanical strength and the waterproof and moistureproof performance of the bottom layer plastering gypsum meet the use requirements of the bottom layer plastering gypsum, in order to improve the operability of the bottom layer plastering gypsum, the plastering gypsum is mainly used for plastering the inner wall of a building, most of the wall bodies have water absorption, so the plastering gypsum needs to have better water retention property, the phenomenon that the bonding part of the gypsum and the wall surface is separated and shelled due to water shortage of the wall body caused by water absorption and the like is avoided, the diatomite added in the scheme is used as a water regulator to keep the water content in the bottom layer plastering gypsum stable, the main component of the diatomite is silicic acid, the surface has numerous pores, can absorb and decompose the peculiar smell in the air, has the functions of humidifying and deodorizing, and when the indoor humidity rises, the ultramicropores on the diatomite can automatically absorb the water in the ambient environment, store it, if moisture content in the environment reduces, humidity descends, diatomaceous earth just can release the moisture content of storing in super micropore, adjust the water content of bottom plastering gypsum, prevent because the separation of the water deficiency cause with the wall junction, the crust, also prevent to appear building wall when contacting moisture because the water content of plastering gypsum is too big, the condition that moisture permeates to the wall inside rapidly and migrates repeatedly in the wall, improve building wall's water resistance, because diatomaceous earth surface has countless pores, make the structure of bottom plastering gypsum loose, be convenient for make level to building wall when the construction, do the basis for the construction of follow-up bottom plastering gypsum.
The main hydration products of the hemihydrate gypsum-silicate cement composite system obtained by adding silicate cement into the regenerated gypsum are rod-shaped dihydrate gypsum crystals, fine needle-shaped ettringite crystals (AFt) and amorphous C-S-H gel. The AFt crystal and the dihydrate gypsum crystal are interwoven to grow into a net structure, and the C-S-H gel is filled in the crystal gap, so that the crystal structure is more compact, and the mechanical property of the bottom layer plastering gypsum is improved.
The invention has the beneficial effects that:
1. the method for producing the regenerated gypsum powder by using the salt gypsum can change waste into valuable, reduce pollution, protect the environment, recycle industrial waste residues, reduce the exploitation of the ore gypsum and save ore resources;
2. the salt gypsum is pretreated by using a mixture of the heptasodium diethylenetriamine penta (methylene phosphonic acid), the potassium formate and the zeolite powder as a dissolution promoter, and the heptasodium diethylenetriamine penta (methylene phosphonic acid) and the zeolite perform a synergistic action to remove redundant sodium chloride components in the salt gypsum so as to facilitate the next preparation of bottom layer plastering gypsum;
3. diatomite is used as a moisture regulator to keep the moisture content in the bottom plastering gypsum stable, prevent the joint part of the bottom plastering gypsum from separating and peeling due to water shortage, and also prevent the situation that when the building wall is contacted with moisture, the moisture rapidly permeates into the wall and repeatedly migrates in the wall due to the overlarge moisture content of the plastering gypsum;
4. the bottom layer plastering gypsum prepared by the scheme has a loose structure, and is convenient for leveling the building wall surface during construction.
Drawings
FIG. 1 is a test of physical properties of the recycled plastering gypsum for construction use obtained in examples 5 to 8 and the recycled plastering gypsum obtained in comparative examples 1 to 3;
FIG. 2 shows the results of the tests of the purification performance and the durability of the purification effect of the plastering gypsum for regenerating buildings obtained in examples 5 to 8 and the plastering gypsum for regenerating buildings obtained in comparative examples 1 to 3.
Detailed Description
In order to make the present invention more comprehensible, the technical solutions of the present invention are further described below with reference to specific embodiments, but the present invention is not limited thereto.
Example 1
The bottom layer plastering gypsum for the regeneration building comprises the following components in parts by weight: 100g of salt gypsum, 10g of dissolution accelerator and 50g of reinforcing additive, wherein the dissolution accelerator comprises 2.5g of heptasodium diethylenetriamine pentamethylene phosphonic acid, 5g of potassium formate and 2.5g of zeolite powder, and the reinforcing additive comprises 10g of sodium tripolyphosphate as a retarder, 5g of ethylene and vinyl acetate copolymer rubber powder as emulsion powder, 2.5g of polycarboxylic acid water reducer as a water reducer, 25g of silicate cement, 2.5g of vitrified micro bubbles and 5g of diatomite.
Example 2
The bottom layer plastering gypsum for the regeneration building comprises the following components in parts by weight: 200g of salt gypsum, 20g of dissolution accelerator and 60g of reinforcing additive, wherein the dissolution accelerator comprises 5g of heptasodium diethylenetriamine penta (methylene phosphonic acid), 10g of potassium formate and 5g of zeolite powder, and the reinforcing additive comprises 10g of sodium tripolyphosphate as a retarder, 4.5g of copolymer rubber powder of vinyl acetate and vinyl versatate as emulsion powder, 2.5g of polycarboxylic acid water reducer as a water reducer, 36g of silicate cement, 2g of vitrified micro bubbles and 5g of diatomite.
Example 3
The bottom layer plastering gypsum for the regeneration building comprises the following components in parts by weight: 150g of salt gypsum, 15g of dissolution accelerator and 55g of reinforcing additive, wherein the dissolution accelerator comprises 3.75g of heptasodium diethylenetriamine penta (methylene phosphonic acid), 7.5g of potassium formate and 3.75g of zeolite powder, and the reinforcing additive comprises 10g of sodium tripolyphosphate as a retarder, 5g of acrylate copolymer rubber powder as emulsion powder, 2.5g of polycarboxylic acid water reducer as a water reducer, 30g of silicate cement, 2.5g of vitrified micro bubbles and 5g of diatomite.
Example 4
The bottom layer plastering gypsum for the regeneration building comprises the following components in parts by weight: 100g of salt gypsum, 20g of dissolution accelerator and 50g of reinforcing additive, wherein the dissolution accelerator comprises 5g of heptasodium diethylenetriamine pentamethylene phosphonic acid, 10g of potassium formate and 5g of zeolite powder, and the reinforcing additive comprises 10g of sodium tripolyphosphate as a retarder, 2g of styrene and acrylate copolymer rubber powder as emulsion powder, 2.5g of polycarboxylic acid water reducer as a water reducer, 30g of silicate cement, 0.5g of vitrified micro bubbles and 5g of diatomite.
Example 5
A preparation method of bottom plastering gypsum for regenerative buildings comprises the following steps:
s1, roasting 2.5g of zeolite powder at 180 ℃ for 1h, cooling, mixing with 2.5g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 5g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 100g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, mixing 10g of sodium tripolyphosphate as a retarder, 5g of ethylene-vinyl acetate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent, 25g of portland cement, 2.5g of vitrified micro bubbles and 5g of diatomite uniformly to obtain a reinforced additive, press-filtering the gypsum slurry, crushing and ball-milling to obtain gypsum powder, wherein the particle size of the gypsum powder after ball-milling is 0.1mm, mixing the gypsum powder with the reinforced additive, calcining at 160 ℃ for 3h, and aging at 20 ℃ for 2h to obtain the bottom layer plastering gypsum for the regenerative building.
Example 6
A preparation method of bottom plastering gypsum for regenerative buildings comprises the following steps:
s1, roasting 5g of zeolite powder at 200 ℃ for 2h, cooling, mixing with 5g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 10g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 200g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, mixing 10g of sodium tripolyphosphate as a retarder, 4.5g of vinyl acetate-vinyl versatate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent, 36g of portland cement, 2g of vitrified micro bubbles and 5g of diatomite uniformly to obtain an enhanced additive, press-filtering the gypsum slurry, crushing and ball-milling to obtain gypsum powder, wherein the particle size of the gypsum powder after ball milling is 0.4mm, mixing the gypsum powder with the enhanced additive, calcining at 180 ℃ for 5h, and aging at 30 ℃ for 3h to obtain the bottom layer plastering gypsum for the regenerative building.
Example 7
A preparation method of bottom plastering gypsum for regenerative buildings comprises the following steps:
s1, roasting 3.75g of zeolite powder at 190 ℃ for 1.5h, cooling, mixing with 3.75g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 7.5g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 150g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, uniformly mixing 10g of sodium tripolyphosphate as a retarder, 5g of acrylate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent, 30g of portland cement, 2.5g of vitrified micro bubbles and 5g of diatomite to obtain a reinforced additive, press-filtering the gypsum slurry, crushing and ball-milling to obtain gypsum powder, wherein the particle size of the gypsum powder after ball-milling is 0.2mm, mixing the gypsum powder with the reinforced additive, calcining at 170 ℃ for 4h, and aging at 25 ℃ for 2.5h to obtain the bottom layer plastering gypsum for the regenerative building.
Example 8
A preparation method of bottom plastering gypsum for regenerative buildings comprises the following steps:
s1, roasting 5g of zeolite powder at 200 ℃ for 1h, cooling, mixing with 5g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 10g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 100g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, mixing 10g of sodium tripolyphosphate as a retarder, 2g of styrene and acrylate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent, 30g of portland cement, 0.5g of vitrified micro bubbles and 5g of diatomite uniformly to obtain a reinforced additive, press-filtering the gypsum slurry, crushing and ball-milling to obtain gypsum powder, wherein the particle size of the gypsum powder after ball-milling is 0.1mm, mixing the gypsum powder with the reinforced additive, calcining at 180 ℃ for 3h, and aging at 20 ℃ for 3h to obtain the bottom layer plastering gypsum for the regenerative building.
Comparative example 1
S1, roasting 2.5g of zeolite powder at 180 ℃ for 1h, cooling, mixing with 2.5g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 5g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 100g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, mixing 10g of sodium tripolyphosphate as a retarder, 5g of ethylene-vinyl acetate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent and 2.5g of vitrified micro bubbles uniformly to obtain a reinforced additive, press-filtering the gypsum slurry, crushing and ball-milling the gypsum slurry to obtain gypsum powder, wherein the particle size of the gypsum powder after ball-milling is 0.1mm, mixing the gypsum powder with the reinforced additive, calcining the mixture at 160 ℃ for 3h, and aging the mixture at 20 ℃ for 2h to obtain the regenerated plastering gypsum.
Comparative example 2
S1, mixing 5g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 10g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter and 200g of salt gypsum, dispersing the mixture into distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, mixing 10g of sodium tripolyphosphate as a retarder, 4.5g of vinyl acetate-vinyl versatate copolymer rubber powder as latex powder, 2.5g of polycarboxylic acid water reducing agent as a water reducing agent, 36g of portland cement, 2g of vitrified micro bubbles and 5g of diatomite uniformly to obtain an enhanced additive, press-filtering the gypsum slurry and crushing to obtain gypsum powder, wherein the particle size of the gypsum powder is 5 microns, mixing the gypsum powder with the enhanced additive, calcining at 180 ℃ for 5 hours, and aging at 30 ℃ for 3 hours to obtain the regenerated plastering gypsum.
Comparative example 3
S1, roasting 3.75g of zeolite powder at 190 ℃ for 1.5h, cooling, mixing with 3.75g of heptasodium diethylenetriamine penta (methylene phosphonic acid) and 7.5g of potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with 150g of salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, uniformly mixing 10g of sodium tripolyphosphate serving as a retarder, 5g of acrylate copolymer rubber powder serving as latex powder, 2.5g of polycarboxylic acid water reducing agent serving as a water reducing agent, 2.5g of vitrified micro bubbles and 5g of diatomite to obtain a reinforced additive, press-filtering the gypsum slurry, crushing and ball-milling to obtain gypsum powder, wherein the particle size of the gypsum powder after ball-milling is 0.2mm, mixing the gypsum powder and the reinforced additive, calcining at 170 ℃ for 4h, and aging at 25 ℃ for 2.5h to obtain the regenerated plastering gypsum.
Test method
The regenerative construction bottom layer plastering gypsum obtained in examples 5 to 8 and the regenerative construction bottom layer plastering gypsum obtained in comparative examples 1 to 3 are subjected to initial setting time, final setting time, water retention rate, flexural strength and compressive strength performance tests according to national standard GB/T28627-2012 plastering gypsum, and the results are shown in FIG. 1, which shows that the regenerative construction bottom layer plastering gypsum prepared by the scheme has good water retention and high strength.
The purification performance and the durability of the purification effect of the regeneration plastering gypsum obtained in the examples 5 to 8 and the regeneration plastering gypsum obtained in the comparative examples 1 to 3 are judged according to the II-class product standard in JCT-1074-2008- "indoor air purification function coating material purification performance", and the result is shown in FIG. 2, which shows that the regeneration plastering gypsum obtained in the scheme has good effect of eliminating the peculiar smell.
Specific embodiments of the present invention have been described above in detail.
It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, any technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments in the prior art based on the inventive concept should be within the scope of protection defined by the claims.

Claims (9)

1. The bottom plastering gypsum for the regenerative building is characterized by comprising the following components in parts by weight: 100-200 parts of salt gypsum, 10-20 parts of a dissolution promoter and 50-60 parts of an enhanced additive, wherein the dissolution promoter comprises heptasodium diethylenetriamine penta (methylene phosphonic acid), potassium formate and zeolite powder, the enhanced additive comprises a retarder, latex powder, a water reducing agent, portland cement, vitrified micro-beads and diatomite, and the mass of the portland cement is 50-60% of that of the enhanced additive.
2. The recycled building primer plaster of claim 1, wherein said retarder is sodium tripolyphosphate.
3. The recycled building bottom plastering gypsum of claim 1, wherein the latex powder is at least one of ethylene and vinyl acetate copolymer rubber powder, vinyl acetate and vinyl versatate copolymer rubber powder, acrylate copolymer rubber powder, styrene and acrylate copolymer rubber powder.
4. The recycled building bottom plastering gypsum of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
5. The regeneration building bottom layer plastering gypsum according to claim 1, wherein the mass ratio of the retarder, the diatomite and the water reducing agent is 4: 2: 1.
6. the method for preparing plastering gypsum for foundation of regenerative construction according to claims 1 to 5, comprising the steps of:
s1, roasting zeolite powder, cooling, mixing with heptasodium diethylenetriamine penta (methylene phosphonic acid) and potassium formate to obtain a dissolution promoter, mixing the dissolution promoter with salt gypsum, dispersing in distilled water, stirring, settling and separating to obtain gypsum slurry;
s2, uniformly mixing the retarder, the latex powder, the water reducing agent, the portland cement, the vitrified micro bubbles and the diatomite to obtain an enhanced additive, press-filtering the gypsum slurry, crushing and ball-milling the gypsum slurry to obtain gypsum powder, mixing the gypsum powder and the enhanced additive, calcining and aging to obtain the bottom layer plastering gypsum for the regeneration building.
7. The method as claimed in claim 6, wherein the zeolite powder is calcined at 180-200 ℃ for 1-2h in step S1.
8. The method of claim 6, wherein in step S2, the particle size of the gypsum powder is 0.1-0.4 mm.
9. The method as claimed in claim 6, wherein the calcination temperature is 160-180 ℃, the calcination time is 3-5h, the aging temperature is 20-30 ℃, and the aging time is 2-3h in step S2.
CN202011328060.8A 2020-11-24 2020-11-24 Bottom layer plastering gypsum for regenerative building and preparation method thereof Pending CN112341022A (en)

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CN107021719A (en) * 2017-05-27 2017-08-08 明光市泰丰新材料有限公司 A kind of high-strength energy-saving surface layer brushing gypsum and its preparation technology
CN107188513A (en) * 2017-07-25 2017-09-22 合肥威斯伏新材料有限公司 A kind of high-strength energy-saving surface layer brushing gypsum and its preparation technology
CN107761966A (en) * 2017-11-15 2018-03-06 嘉兴市博宏新型建材有限公司 A kind of motar containing phase-changing energy storage material available for automatic arc spraying
EP2279154B1 (en) * 2008-05-27 2018-10-17 Dow Silicones Corporation Gypsum materials
CN110759699A (en) * 2019-12-13 2020-02-07 河南城建学院 Bottom layer plastering gypsum and preparation method thereof
CN111606675A (en) * 2019-06-21 2020-09-01 中建材创新科技研究院有限公司 Method for improving high chloride ion content of plastering gypsum and plastering gypsum

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EP2279154B1 (en) * 2008-05-27 2018-10-17 Dow Silicones Corporation Gypsum materials
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CN106587679A (en) * 2016-12-06 2017-04-26 河南同伟建材有限公司 Building gypsum powder produced by salt gypsum and preparation method thereof
CN107021719A (en) * 2017-05-27 2017-08-08 明光市泰丰新材料有限公司 A kind of high-strength energy-saving surface layer brushing gypsum and its preparation technology
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