CN117142832B - Dihydrate gypsum artificial inorganic marble and preparation method thereof - Google Patents

Dihydrate gypsum artificial inorganic marble and preparation method thereof Download PDF

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CN117142832B
CN117142832B CN202311428884.6A CN202311428884A CN117142832B CN 117142832 B CN117142832 B CN 117142832B CN 202311428884 A CN202311428884 A CN 202311428884A CN 117142832 B CN117142832 B CN 117142832B
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marble
gypsum
dihydrate gypsum
parts
dihydrate
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CN117142832A (en
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李涛
商赵健
程美林
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Shanghai Meitian Ecological Technology Development 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
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/12—Waste materials; Refuse from quarries, mining or the like
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/143—Calcium-sulfate
    • C04B22/145—Gypsum from the desulfuration of flue gases
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • C04B24/383—Cellulose or derivatives thereof
    • 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
    • C04B7/00—Hydraulic cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/54—Substitutes for natural stone, artistic materials or the like
    • C04B2111/542—Artificial natural stone
    • C04B2111/545—Artificial marble
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to the technical field of artificial marble preparation, and discloses a dihydrate gypsum artificial inorganic marble and a preparation method thereof, wherein the dihydrate gypsum artificial inorganic marble comprises the following components: master batch main material: dihydrate gypsum, mineral powder and cement; building admixture: the water reducer comprises a polycarboxylate water reducer, cellulose, water glass, redispersible latex powder and graphene; aggregate: grading stones. The preparation method comprises the following steps: uniformly mixing the master batch main material and the building additive according to a certain proportion to obtain a dihydrate gypsum cementing material master batch; mixing the gypsum cementing material master batch with aggregate, adding water, and stirring uniformly to obtain mixed slurry; injecting the mixed slurry into a mould, carrying out vacuum defoaming and compression molding to obtain a blank block, and placing the blank block into water for curing; and (3) grinding and polishing the cured blank block to enable the blank block to have a marble surface layer, and then assisting with a curing agent to treat the surface to obtain the dihydrate gypsum artificial inorganic marble.

Description

Dihydrate gypsum artificial inorganic marble and preparation method thereof
Technical Field
The invention relates to an artificial inorganic marble and a preparation method thereof, belonging to the technical field of artificial marble preparation.
Background
The marble is a natural stone material with good rigidity, high hardness, strong wear resistance and small temperature deformation, is very beautiful after polishing, can form a natural water-ink landscape painting in section, and can be used for processing various shapes, plates, wall surfaces of buildings, floors, tables, columns and the like. However, natural marble is mostly radioactive, and the thin plate is brittle, so that pits and even cracks are easy to occur when the thin plate is hit by hard objects. In addition, natural marble is expensive and the need to make mountain and fry the stone is a damage to ecology, is restricted by natural stone resources, and the difficulty of providing stone in large quantities is high, so artificial marble has been produced.
The artificial marble is a novel building decoration material developed in recent years, is generally made of unsaturated polyester resin, cement and other fillers, has various colors, has the processability of synthetic materials, and is widely applied to the field of building decoration. The preparation method of the artificial marble in the current market mainly comprises the following steps: mixing unsaturated polyester resin with cement, curing agent, accelerator and filler, stirring, and curing in mould.
The artificial marble has natural texture and has a sense similar to that of natural stone. Because of its strong plasticity and customizable nature, it is also widely used, but artificial marble is produced synthetically, with many uncontrollable elements. Some artificial marble even have formaldehyde, benzene and other harmful substances, and some organic solvents are added in the production process, so that the artificial marble is easy to deform, crack and other problems are caused.
The invention patent with the publication number of CN102432261B discloses a preparation method of decorative artificial marble with the advantages of hydration reaction of calcium sulfate hemihydrate, modification, crystal transformation, built-in waterproof and continuous compression molding process as technical support, realization of transformation of hydration structure water and hydration time into compression molding water and compression time respectively, transformation of crystal microstructure into compact plate-shaped structure, and physical and mechanical properties, environmental protection function properties and stone sense comparable with those of natural stone. The invention only uses the hydration of the calcium sulfate hemihydrate into the calcium sulfate dihydrate as a reaction mechanism, the strength of the hydrated gypsum hemihydrate with better quality does not exceed 20MPa even after 7 days, and the hydration reaction coagulation time of the gypsum hemihydrate is only about 10 minutes, so that the gypsum hemihydrate is coagulated after the press molding is performed, and the operation is difficult.
The dihydrate gypsum has extremely low strength due to the non-water resistance and the overlong setting time (2-3 days), and is only used as a cement retarder or filler at present, if a large amount of dihydrate gypsum is needed to be used for manufacturing gypsum boards or used as a cementing material, the dihydrate gypsum is needed to be dried into semi-hydrated gypsum through steam of a power plant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a dihydrate gypsum artificial inorganic marble and a preparation method thereof.
In order to solve the technical problems, the present invention provides a dihydrate gypsum artificial inorganic marble, comprising: in terms of the weight portions of the components,
master batch main material: 500-950 parts of dihydrate gypsum, 150-400 parts of mineral powder and 50-200 parts of cement;
building admixture: 1 to 5 parts of polycarboxylate water reducer, 0.1 to 1 part of cellulose, 1 to 2 parts of water glass, 1 to 6 parts of redispersible emulsion powder and 0.1 to 1 part of graphene;
aggregate: 1000-3000 parts of graded stone.
Preferably, the dihydrate gypsum is industrial solid waste dihydrate gypsum after desulfurization and denitrification in the power generation process of the coal-fired power plant.
Preferably, the cellulose is hydroxypropyl methylcellulose.
The invention also provides a preparation method of the dihydrate gypsum artificial inorganic marble, which comprises the following steps:
uniformly mixing the master batch main material and the building additive according to a proportion to obtain a dihydrate gypsum cementing material master batch;
mixing the dihydrate gypsum cementing material master batch with aggregate, adding water, and uniformly stirring to obtain mixed slurry;
injecting the mixed slurry into a mould, carrying out vacuum defoaming and compression molding to obtain blank blocks, and placing the blank blocks into water for curing for 28 days to obtain cured blank blocks;
and (3) grinding and polishing the cured blank block to enable the blank block to have a marble surface layer, and then treating the surface by assisting with a curing agent to obtain the dihydrate gypsum artificial inorganic marble.
Preferably, the addition amount of water in the mixed slurry is 25% -30%.
Preferably, the gypsum dihydrate matrix is weakly basic.
The invention has the beneficial effects that:
1. according to the invention, cement and mineral powder are added into the dehydrate gypsum cementing material master batch, the dehydrate gypsum is weakly acidic, the cement is more alkaline, a large amount of dehydrate gypsum is assisted with a small amount of cement to make the whole material weakly alkaline, and then a certain amount of mineral powder and building additives are added, so that the mineral powder has good hydration activity, on one hand, hydration products such as hydrated calcium silicate gel are generated under the excitation of weakly alkaline conditions, on the other hand, the mineral powder and the dehydrate gypsum generate a certain amount of ettringite, and the hydration products and ettringite are wrapped and filled on the crystal surfaces and gaps of the dehydrate gypsum, so that the internal structural compactness of the composite cementing material is improved, and the contact point between the dehydrate gypsum and water is reduced, thereby enhancing the water resistance.
2. According to the invention, the polycarboxylic acid water reducer is added in the process of preparing the marble, the water consumption of gypsum can be reduced efficiently by adding the water reducer, gaps left by volatilization of water are reduced after the marble is solidified, the compactness of the marble is increased to a certain extent, and the water resistance of the dihydrate gypsum is improved.
3. The interior of the dihydrate gypsum matrix is mainly formed by mutually lapping needle-shaped and lamellar dihydrate gypsum crystals to form a net-shaped and skeleton structure, and the interior structure of the gypsum crystals is loose and has large void ratio.
4. According to the invention, water glass is added into the preparation of the dihydrate gypsum cementing material, silicate ions, sulfate ions and hydrogen ions in the solution in the dihydrate gypsum cementing material doped with the water glass can generate stronger hydrogen bond association, and part of water molecules are wrapped in the dihydrate gypsum cementing material, so that the consistency and cohesiveness of the aqueous solution on the surface of slurry particles in water are increased, the infiltration of external water molecules, the outward diffusion and dissolution processes of internal solid powder are reduced, and the water resistance of the dihydrate gypsum is improved to a certain extent.
5. The invention uses the dihydrate gypsum as the master batch of the dihydrate gypsum cementing material, and other materials and building additives are added, so that the water resistance is changed, and the overall strength of the dihydrate gypsum cementing material is further improved by means of reducing water consumption, increasing consistency and the like. The artificial marble prepared by the invention has the advantages of low price, stable performance, no pollution, difficult cracking and deformation, high strength and the like.
6. The invention greatly utilizes industrial solid waste dihydrate gypsum and mineral powder, accelerates the consumption of industrial solid waste, realizes the high-quality comprehensive utilization of solid waste resources, and has no pollution to human bodies and environment, and is green and environment-friendly; meanwhile, the dihydrate gypsum does not need to be calcined and dried, so that zero pollution, zero emission and zero energy consumption are realized, secondary resources are replaced by primary resources, and the damage and pollution to the ecological environment are reduced.
Drawings
FIG. 1 is a drawing showing the result of curing the gypsum dihydrate artificial inorganic marble blank of example 6 according to the standard for 28 days.
FIG. 2 shows the results of the gypsum dihydrate artificial inorganic marble wool briquette of example 6, which was left to stand for 28 days after curing for 28 days in different states, with natural curing, standard curing, and in-water curing in this order from left to right.
FIG. 3 is a diagram showing a raw set of gypsum dihydrate artificial inorganic marble before polishing of preparation example 1.
FIG. 4 is a diagram of the gypsum dihydrate artificial inorganic marble after polishing of preparation example 1.
Detailed Description
The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
The materials and sources used for the examples and comparative examples are as follows:
table 1 materials and sources
Example 1
A method for preparing a dihydrate gypsum artificial inorganic marble blank block comprises the following steps:
(1) According to parts by weight, 850 parts of industrial solid waste dihydrate gypsum, 150 parts of mineral powder and 50 parts of cement are taken, mixed with 1 part of polycarboxylate water reducer, 1 part of hydroxypropyl methylcellulose, 1 part of water glass and 1 part of redispersible latex powder, and 0.1 part of graphene are uniformly mixed, so as to obtain the dihydrate gypsum cementing material master batch.
(2) The dihydrate gypsum cementing material master batch is uniformly mixed with 3000 parts (by weight) of 1-10 mm-grade stone, water is added and uniformly stirred, so as to obtain mixed slurry, and the addition amount of water in the mixed slurry is 25%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming and compression molding, wherein the vacuum degree is-0.075 MPa, and the pressure is 2.5 MPa, so as to obtain a blank block.
Example 2
A method for preparing a dihydrate gypsum artificial inorganic marble blank block comprises the following steps:
(1) According to the weight parts, 800 parts of industrial solid waste gypsum dihydrate, 150 parts of mineral powder and 50 parts of cement are taken and mixed with 2 parts of polycarboxylate water reducer, 0.8 part of hydroxypropyl methylcellulose, 1 part of water glass and 2 parts of redispersible latex powder and 0.3 part of graphene uniformly to obtain the gypsum dihydrate cementing material master batch.
(2) The dihydrate gypsum cementing material master batch and 2500 parts (by weight) of 1-10 mm grade cobbles are uniformly mixed, water is added and uniformly stirred, so as to obtain mixed slurry, and the addition amount of water in the mixed slurry is 26%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming and compression molding, wherein the vacuum degree is-0.072 MPa, and the pressure is 2.8 MPa, so as to obtain the blank block.
Example 3
A method for preparing a dihydrate gypsum artificial marble blank block comprises the following steps:
(1) According to the weight parts, 750 parts of industrial solid waste gypsum dihydrate, 180 parts of mineral powder and 70 parts of cement are taken and mixed with 3 parts of polycarboxylate water reducer, 0.5 part of hydroxypropyl methylcellulose, 1.5 parts of water glass and 3 parts of redispersible latex powder, and 0.5 part of graphene, and the mixture is uniformly mixed to obtain the gypsum dihydrate cementing material master batch.
(2) The dihydrate gypsum cementing material master batch is uniformly mixed with 2000 parts (by weight) of 1-10 mm-grade stone, water is added and uniformly stirred, so as to obtain mixed slurry, and the addition amount of water in the mixed slurry is 27%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming and compression molding, wherein the vacuum degree is-0.072 MPa, and the pressure is 2.0 MPa, so as to obtain the blank block.
Example 4
A method for preparing a dihydrate gypsum artificial marble blank block comprises the following steps:
(1) According to the weight portion, 700 portions of industrial solid waste gypsum, 200 portions of mineral powder and 100 portions of cement are taken and mixed with 4 portions of polycarboxylate water reducer, 0.3 portion of hydroxypropyl methylcellulose, 1.5 portions of water glass and 4 portions of redispersible latex powder, and 0.8 portion of graphene are evenly mixed, so as to obtain the gypsum dihydrate cementing material master batch.
(2) The dihydrate gypsum cementing material master batch is uniformly mixed with 1500 parts (by weight) of 1-10 mm-grade stone, water is added and uniformly stirred, so as to obtain mixed slurry, and the addition amount of water in the mixed slurry is 28%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming and compression molding, wherein the vacuum degree is-0.075 MPa, and the pressure is 2.2 MPa, so as to obtain a blank block.
Example 5
A method for preparing a dihydrate gypsum artificial marble blank block comprises the following steps:
(1) According to the weight parts, 600 parts of industrial solid waste gypsum dihydrate, 250 parts of mineral powder and 150 parts of cement are taken and mixed, and uniformly mixed with 5 parts of polycarboxylate water reducer, 0.1 part of hydroxypropyl methylcellulose, 2 parts of water glass, 5 parts of redispersible latex powder and 0.8 part of graphene, so as to obtain the gypsum dihydrate cementing material master batch.
(2) The dihydrate gypsum cementing material master batch is uniformly mixed with 1250 parts (by weight) of 1-10 mm-grade stone, water is added and uniformly stirred, and mixed slurry is obtained, wherein the addition amount of water in the mixed slurry is 29%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming, pressurizing and forming, wherein the vacuum degree is-0.068 MPa, and the pressure is 2.5 MPa, so as to obtain the blank block.
Example 6
A method for preparing a dihydrate gypsum artificial marble blank block comprises the following steps:
(1) According to the weight parts, 500 parts of industrial solid waste gypsum dihydrate, 300 parts of mineral powder and 200 parts of cement are taken and mixed with 3 parts of polycarboxylate water reducer, 1 part of hydroxypropyl methylcellulose, 1.5 parts of water glass, 3 parts of redispersible latex powder and 1 part of graphene uniformly to obtain the gypsum dihydrate cementing material master batch.
(2) The dihydrate gypsum cementing material master batch is uniformly mixed with 1000 parts (by weight) of 1-10 mm-grade stone, water is added and uniformly stirred, so as to obtain mixed slurry, and the addition amount of water in the mixed slurry is 30%.
(3) Injecting the mixed slurry into a mould, vacuum defoaming and compression molding, wherein the vacuum degree is-0.070 MPa, and the pressure is 2.8 MPa, so as to obtain a blank block.
Performance testing
(1) Firstly, fixing the non-cured dihydrate gypsum artificial marble blank block prepared in the examples 1-6 on a sample loading device according to the method in GB/T35160.2-2017, then applying a load of 20N for 14 days and 28 days respectively, and then detecting the bending strength of the blank block according to the method in GB/T35160.2-2017; the non-cured gypsum dihydrate artificial marble blank block prepared in examples 1-6 was placed on a tester according to the method in GB/T35160.3-2017, then a load of 20N was applied for 14 days and 28 days, respectively, and then the compressive strength was measured according to the method in GB/T35160.3-2017.
Table 2 blank block performance test of different examples
As is clear from Table 2, the artificial marble wool block prepared in the manner of example 6 had overall higher strength than the artificial marble wool blocks prepared in examples 1 to 5. The master batch main material of the artificial marble wool briquette of example 6 is gypsum dihydrate: mineral powder: the proportion of cement is 5:3:2, the amount of the dihydrate gypsum is smaller than that of examples 1-5, and the amount of the mineral powder and the cement is larger than that of examples 1-5. The cement with strong alkalinity is mixed with the weak acidity dihydrate gypsum to make the whole material be weak alkaline, and then mineral powder with high hydration activity and building additive are added, so that not only can hydration products such as hydrated calcium silicate gel and the like be generated, but also a certain amount of ettringite can be generated with the dihydrate gypsum, the hydration products and ettringite are wrapped and filled in the surface and gaps of the dihydrate gypsum crystal, the compactness of the internal structure of the composite cementing material is improved, and the contact point between the dihydrate gypsum and water is reduced, so that the water resistance is enhanced. Therefore, the proportion of the dihydrate gypsum, the mineral powder and the cement in the master batch is proper, and the building additive with proper components is added, so that the compressive strength of the prepared marble material is also greatly improved.
(2) The gypsum dihydrate artificial inorganic marble wool briquettes prepared according to the method of example 6 were divided into three groups, the first group was left to stand in a natural curing state for 28 days, the second group was cured in a standard curing box for 28 days, and the third group was put into water for curing for 28 days. And then the bending strength and the compression strength of the dihydrate gypsum artificial inorganic marble wool briquettes under different placing conditions are detected according to the method in the performance test (1).
TABLE 3 Performance test under different Placement conditions
As is clear from Table 3, the bending strength and the compressive strength of the artificial marble wool briquette in the water-cultured state were high. The standard curing result of the blank block of the dihydrate gypsum artificial inorganic marble is shown in fig. 1, the whole section is cyan, and fig. 2 shows the result of curing the blank block of the dihydrate gypsum artificial inorganic marble in different states for 28 days and then placing for 28 days, so that the surface of the blank block after standard curing and underwater curing is still dilute, and cyan can be seen. Therefore, the marble can be cured by water after the subsequent production, and if the condition can not be met, the marble can be cured by sprinkling water periodically.
Preparation example 1
A method for preparing dihydrate gypsum artificial inorganic marble, comprising:
(1) According to weight parts, mixing 500 parts of industrial solid waste gypsum dihydrate, 300 parts of mineral powder and 200 parts of cement, 3 parts of polycarboxylate water reducer, 1 part of hydroxypropyl methylcellulose, 1.5 parts of water glass and 3 parts of redispersible latex powder with 1 part of graphene, and uniformly mixing to obtain gypsum dihydrate cementing material master batch;
(2) Uniformly mixing the dihydrate gypsum cementing material master batch with 1000 parts (by weight) of 1-10 mm-grade stone, adding water and uniformly stirring to obtain mixed slurry, wherein the addition amount of water in the mixed slurry is 30%;
(3) Injecting the mixed slurry into a mold, vacuum defoaming, pressurizing and molding, wherein the vacuum degree is-0.070 MPa, and the pressure is 2.8 MPa, so as to obtain a blank block, as shown in figure 3, and placing the blank block into water for curing for 28 days;
(4) Grinding and polishing the cured blank block to form a marble surface layer, and uniformly coating an amino ethyl piperazine serving as a curing agent on the marble surface layer to obtain the dihydrate gypsum artificial inorganic marble, as shown in fig. 4;
(5) The resulting artificial marble was tested according to the test method in the performance test, and after 28 days of bending, it was measured to have a bending strength of 8.5 MPa and after 28 days of compression, it was measured to have a compression strength of 61 MPa.
Comparative example 1
A method for preparing semi-hydrated gypsum artificial inorganic marble, comprising:
(1) According to weight parts, 93.5 parts of natural alpha-type calcium sulfate hemihydrate, 2 parts of glass fiber, 1.5 parts of ethylene/vinyl acetate copolymer and 3 parts of titanium dioxide are taken, and each powder is continuously metered and then enters a spiral reamer mixing device, so that continuous stirring and continuous metering of standard powder are realized;
(2) Continuously metering clear water by using a screw conveying standard powder and a flow pump, and pushing a standard semi-wet mixture by using screw stirring;
(3) Continuous roll forming, wherein the pressure is 2.0 MPa;
(4) The pulse rollers synchronously roll on the surface of the formed sample, and send out pulse signals to perform cutting treatment when the surface of the formed sample reaches the set specification of the product, and the cut samples respectively enter a polishing table to perform polishing treatment, so that the artificial marble finished product is obtained;
(5) The resulting artificial marble product was tested according to the test method in the performance test (1), and after 28 days of bending, it was measured to have a bending strength of 4.12 MPa and after 28 days of compression, it was measured to have a compression strength of 16.74 MPa.
As is apparent from preparation example 1 and comparative example 1, marble prepared using gypsum dihydrate as a raw material, which had a flexural strength of 8.5 MPa after 28 days of bending and a compressive strength of 61 MPa after 28 days of compression; and the marble prepared using the semi-hydrated gypsum as a raw material has a flexural strength measured after 28 days lower than that of the marble prepared using the dihydrate gypsum as a raw material by one time, and has a compressive strength measured after 28 days lower than that of the marble prepared using the dihydrate gypsum as a raw material by 2.6 times. The marble prepared by using the dihydrate gypsum as a raw material in combination with the preparation method of the present invention has higher flexural and compressive strength than the marble prepared by using the hemihydrate gypsum as a raw material.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (4)

1. An artificial inorganic gypsum dihydrate marble, characterized by comprising: in terms of the weight portions of the components,
master batch main material: 500-950 parts of dihydrate gypsum, 150-400 parts of mineral powder and 50-200 parts of cement;
building admixture: 1 to 5 parts of polycarboxylate water reducer, 0.1 to 1 part of cellulose, 1 to 2 parts of water glass, 1 to 6 parts of redispersible emulsion powder and 0.1 to 1 part of graphene;
aggregate: 1000-3000 parts of graded stone;
the dihydrate gypsum is industrial solid waste dihydrate gypsum after desulfurization and denitrification in the power generation process of the coal-fired power plant; the cellulose is hydroxypropyl methyl cellulose; the grain size of the grading stone is 1-10 mm.
2. A method for preparing the dihydrate gypsum artificial inorganic marble according to claim 1, characterized by comprising:
uniformly mixing the master batch main material and the building additive according to a proportion to obtain a dihydrate gypsum cementing material master batch;
mixing the dihydrate gypsum cementing material master batch with aggregate, adding water, and uniformly stirring to obtain mixed slurry;
injecting the mixed slurry into a mould, carrying out vacuum defoaming and compression molding to obtain blank blocks, and placing the blank blocks into water for curing for 28 days to obtain cured blank blocks;
and (3) grinding and polishing the cured blank block to enable the blank block to have a marble surface layer, and then treating the surface by assisting with a curing agent to obtain the dihydrate gypsum artificial inorganic marble.
3. The method for preparing the dihydrate gypsum artificial inorganic marble according to claim 2, characterized in that the addition amount of water in the mixed slurry is 25% -30%.
4. The method for preparing the gypsum dihydrate artificial inorganic marble according to claim 2, wherein the gypsum binder master batch is weakly alkaline.
CN202311428884.6A 2023-10-31 2023-10-31 Dihydrate gypsum artificial inorganic marble and preparation method thereof Active CN117142832B (en)

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CN101830678A (en) * 2009-03-13 2010-09-15 上海晋马建材有限公司 Desulfurized gypsum.phosphorous gypsum without roasting, extruding gypsum block and production method thereof
CN103588453A (en) * 2013-09-03 2014-02-19 盐城工学院 High-volume non-calcinated desulphurization gypsum block and preparation method thereof
CN105967754A (en) * 2016-05-09 2016-09-28 马振义 Calcium sulfate dehydrate-based foam material with thermal insulation and preparation method thereof
CN115321903A (en) * 2022-08-02 2022-11-11 中建海龙科技有限公司 Inorganic artificial stone plate and preparation method thereof
CN115353361A (en) * 2022-07-13 2022-11-18 广东能源集团科学技术研究院有限公司 Composite cementing material and preparation method and application thereof

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CN101265068A (en) * 2008-04-28 2008-09-17 长沙归一建材科技有限公司 Gelatinization material gypsum-cement and producing method thereof
CN101830678A (en) * 2009-03-13 2010-09-15 上海晋马建材有限公司 Desulfurized gypsum.phosphorous gypsum without roasting, extruding gypsum block and production method thereof
CN103588453A (en) * 2013-09-03 2014-02-19 盐城工学院 High-volume non-calcinated desulphurization gypsum block and preparation method thereof
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