Inorganic high-strength artificial quartz stone and preparation method thereof

Abstract

The present invention relates to an inorganic high-strength artificial quartz stone and a preparation method thereof, belonging to the technical field of artificial quartz stone. The present invention creatively performs alkaline etching with a sodium hydroxide solution and grafting with sodium carboxymethyl cellulose on basalt fibers with a length between 3 and 5 mm, thereby preparing a modified basalt fiber with a relatively short length. The modified basalt fiber is then composited with an untreated basalt fiber with a length between 10 and 15 mm to form a composite basalt fiber. Subsequently, silica fume, alum stone, and the composite basalt fiber are used as reinforcing agents, mixed with cement, quartz sand, quartz powder, a water reducer, and deionized water. After vibrating and molding under a vacuum state, curing, and other conventional operations, an inorganic artificial quartz stone having excellent strength is obtained. At the same time, the present invention has a simple process in the entire preparation process of the inorganic artificial quartz stone, and is easy to implement industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial quartz stone, and particularly relates to an inorganic high-strength artificial quartz stone and a preparation method thereof. Background Art

[0002] Artificial quartz stone is a plate made of cementitious materials, quartz sand, quartz powder and additives as main components, which is mixed, vacuumized under negative pressure, and vibrated to form a plate. It has a hard texture and dense structure, and has wear resistance, high temperature resistance, corrosion resistance and other properties that other decorative materials cannot match. Among them, if classified according to the type of cementitious materials, artificial quartz stone can be divided into inorganic artificial quartz stone (cement as cementitious material) and organic artificial quartz stone (resin as cementitious material). Compared with organic artificial quartz stone, inorganic artificial quartz stone emits less volatile organic pollutants, is more environmentally friendly, and conforms to the concept of green development. However, the existing inorganic artificial quartz stone still has certain disadvantages that limit its actual application effect. This is because when cement is used as a cementitious material, it often faces the problem of limited bonding strength. Cement is not as good as resin in adhesion, resulting in a decrease in interface strength, which ultimately results in the strength of the inorganic artificial quartz stone still having a lot of room for improvement. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention aims to provide an inorganic high-strength artificial quartz stone and a preparation method thereof. The present invention creatively subjects basalt fibers with a length of 3-5 mm to alkaline etching with a sodium hydroxide solution and grafting with sodium carboxymethyl cellulose in sequence, thereby preparing a modified basalt fiber with a relatively short length. The modified basalt fiber is then composited with untreated basalt fibers with a length of 10-15 mm to form a composite basalt fiber. Silica fume, alum stone, and the composite basalt fiber are then mixed with cement, quartz sand, quartz powder, a water reducer, and deionized water in a certain mass ratio as reinforcing agents. After vibrating and molding under vacuum, curing, and other conventional operations, an inorganic artificial quartz stone having excellent strength is obtained. At the same time, the present invention has a simple process in the entire preparation process of the inorganic artificial quartz stone, and is easy to implement in industrial production.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] The invention discloses an inorganic high-strength artificial quartz stone, which is prepared from cement, quartz sand, quartz powder, a water reducer, a strengthening agent and deionized water; the strengthening agent comprises silica fume, alunite and composite basalt fiber.

[0006] As a preferred technical solution of the present invention, the mass ratio of the cement, the quartz sand, the quartz powder, the water reducer, the strengthener and the deionized water is 30-32:35:25-30:0.2-0.3:9:8-10.

[0007] As a preferred technical solution of the present invention, the mass ratio of the silica fume, the alunite and the composite basalt fiber is 3:2:3-4.

[0008] As a preferred technical solution of the present invention, the cement is Portland cement.

[0009] As a preferred technical solution of the present invention, the quartz sand is continuously graded quartz sand; the particle size distribution of the continuously graded quartz sand is 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-140 mesh, and the mass ratio is 3-3.2:3.5:2:1.5.

[0010] As a preferred technical solution of the present invention, the particle size of the quartz powder is 300-320 mesh.

[0011] As a preferred technical solution of the present invention, the water reducer is a polycarboxylate water reducer.

[0012] As a preferred technical solution of the present invention, the particle size of the alunite is 200-300 mesh.

[0013] As a preferred technical solution of the present invention, the composite basalt fiber is prepared by the following steps:

[0014] Step A: Add 2-3 parts by weight of basalt fiber A to 80 parts by weight of sodium hydroxide solution, then stir at 40-60° C. for 1 hour, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 60-80° C. until constant weight, to obtain component A;

[0015] Step B: adding 2-3 parts by weight of sodium carboxymethyl cellulose and 4-5 parts by weight of component A to 80 parts by weight of deionized water, stirring at 60-65° C. for 2 hours, filtering, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 60-80° C. until constant weight is obtained to obtain modified basalt fiber A;

[0016] Step C: The modified basalt fiber A and the basalt fiber B are mixed in a mass ratio of 1-1.2:2 to complete the preparation.

[0017] Furthermore, the concentration of the sodium hydroxide solution in step A is 0.5-0.7 mol / L.

[0018] Furthermore, the diameter of the basalt fiber A in step A is 10-15 μm; the length of the basalt fiber A is 3-5 mm; and the tensile strength of the basalt fiber A is 3500-4000 MPa.

[0019] Furthermore, in step C, the diameter of the basalt fiber B is 10-15 μm; the length of the basalt fiber B is 10-15 mm; and the tensile strength of the basalt fiber B is 3500-4000 MPa.

[0020] A method for preparing inorganic high-strength artificial quartz stone, the preparation method comprising the following steps:

[0021] Add cement and water reducing agent to deionized water, then stir for 2-3 minutes at room temperature, then add quartz sand, quartz powder and strengthening agent, continue stirring for 3-5 minutes at room temperature, pour into the mold, vibrate and form using a vibration compaction molding machine under vacuum, demould, cure, cool naturally to room temperature, polish, cut, and the preparation is complete.

[0022] As a preferred technical solution of the present invention, the vacuum degree of the vacuum state is -0.1 MPa.

[0023] As a preferred technical solution of the present invention, the operating parameters of the vibration compaction molding machine are as follows: the vibration frequency is controlled at 50 Hz, the static pressure is controlled at 40-50 kg, and the time is controlled at 5 minutes.

[0024] As a preferred technical solution of the present invention, the curing refers to curing at 35-40°C for 7 days.

[0025] Beneficial effects of the present invention:

[0026] (1) The present invention creatively subjects basalt fibers with a length of 3-5 mm to alkaline etching with sodium hydroxide solution and grafting with sodium carboxymethyl cellulose in sequence, thereby preparing a modified basalt fiber with a relatively short length. The modified basalt fiber is then composited with untreated basalt fibers with a length of 10-15 mm to form a composite basalt fiber. Silica fume, alum stone and the composite basalt fiber in a certain mass ratio are then used as reinforcing agents and mixed with cement, quartz sand, quartz powder, a water reducer and deionized water. After conventional operations such as vibration molding and curing under vacuum, an inorganic artificial quartz stone having excellent strength is obtained. At the same time, the present invention has a simple process in the entire preparation process of the inorganic artificial quartz stone and is easy to realize industrial production.

[0027] (2) The present invention creatively performs alkaline etching with sodium hydroxide solution and grafting with sodium carboxymethyl cellulose on basalt fibers with a length of 3-5 mm. On the one hand, sodium hydroxide, as a strong base, can etch the surface of the basalt fibers, thereby forming a certain groove structure. On the other hand, sodium carboxymethyl cellulose contains a large amount of carboxylate ions, which can react with the metal ions on the surface of the basalt fibers to complete the grafting through the formation of covalent bonds, thereby preparing a modified basalt fiber with a relatively short length, which is combined with silica fume, alum stone and basalt fibers with a length of 10-15 mm without any treatment as reinforcing agents, thereby giving the final inorganic artificial quartz stone excellent strength; silica fume contains highly chemically active silicon dioxide, which can undergo secondary hydration with the hydration products of cement to generate amorphous secondary hydration products, thereby enhancing the interface strength to a certain extent. Alunite can promote the formation of needle-shaped ettringite in the system, and the interfacial bonding strength is further improved by interweaving the amorphous secondary hydration products with the needle-shaped ettringite. At the same time, the introduction of modified basalt fiber can not only better fit and fill the tiny cracks inside the system with its own small size and groove structure, thereby achieving an interface repair effect, but also because its surface contains a large number of carboxylate ions, it can also produce organic-metal coordination with the secondary hydration product, promoting the formation of secondary hydration products on its surface, thereby exerting an excellent synergistic effect and obtaining a better interface repair effect (although the polycarboxylate water-reducing agent also contains a large number of carboxylate ions, unlike the modified basalt fiber of the present invention, the polycarboxylate water-reducing agent mainly attaches to the surface of the cement particles to exert a water-reducing effect). As for the basalt fiber with a length of 10-15 mm, it has a certain reinforcing effect as a whole. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0029] The silicate cement in all the embodiments and comparative examples of the present invention was purchased directly from the market, purchased from Jiangxi Yinshan Super Materials Technology Co., Ltd., and the model was Yinshan brand P.W42.5 grade; the polycarboxylate water reducer was purchased directly from the market, purchased from Shandong Yuncheng Huihuang New Building Materials Technology Co., Ltd., with a solid content of 20%; the sodium carboxymethyl cellulose was purchased directly from the market, purchased from Shandong Weifang Lite Composite Materials Co., Ltd., model IH8; the silica fume was purchased directly from the market, purchased from Gansu Sanyuan Silicon Materials Co., Ltd., model SF88.

[0030] Example 1

[0031] The invention discloses an inorganic high-strength artificial quartz stone, which is prepared from cement, quartz sand, quartz powder, a water reducer, a strengthening agent and deionized water; the strengthening agent comprises silica fume, alunite and composite basalt fiber.

[0032] The mass ratio of the cement, the quartz sand, the quartz powder, the water reducer, the strengthener and the deionized water is 30:35:25:0.2:9:8.

[0033] The mass ratio of the silica fume, the alunite and the composite basalt fiber is 3:2:3.

[0034] The cement is Portland cement.

[0035] The quartz sand is continuously graded quartz sand; the particle size distribution of the continuously graded quartz sand is 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-140 mesh, and the mass ratio is 3:3.5:2:1.5.

[0036] The particle size of the quartz powder is 300 mesh.

[0037] The water reducer is a polycarboxylate water reducer.

[0038] The particle size of the alum stone is 200 meshes.

[0039] The composite basalt fiber is prepared by the following steps:

[0040] Step A: Add 2 parts by weight of basalt fiber A to 80 parts by weight of sodium hydroxide solution, then stir at 40° C. for 1 hour, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 60° C. until constant weight, to obtain component A;

[0041] Step B: adding 2 parts by weight of sodium carboxymethyl cellulose and 4 parts by weight of component A to 80 parts by weight of deionized water, stirring at 60° C. for 2 hours, filtering, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 60° C. until constant weight, to obtain modified basalt fiber A;

[0042] Step C: The modified basalt fiber A and the basalt fiber B are mixed in a mass ratio of 1:2 to complete the preparation.

[0043] The concentration of the sodium hydroxide solution in step A is 0.5 mol / L.

[0044] The diameter of the basalt fiber A in step A is 10 μm; the length of the basalt fiber A is 3 mm; and the tensile strength of the basalt fiber A is 3500 MPa.

[0045] In step C, the diameter of the basalt fiber B is 10 μm; the length of the basalt fiber B is 10 mm; and the tensile strength of the basalt fiber B is 3500 MPa.

[0046] A method for preparing inorganic high-strength artificial quartz stone, the preparation method comprising the following steps:

[0047] Add cement and water reducing agent to deionized water, then stir for 2 minutes at room temperature, then add quartz sand, quartz powder and strengthening agent, continue stirring for 3 minutes at room temperature, pour into the mold, vibrate and form using a vibration compaction molding machine under vacuum, demold, cure, cool naturally to room temperature, polish, cut, and the preparation is complete.

[0048] The vacuum degree of the vacuum state is -0.1 MPa.

[0049] The operating parameters of the vibration compaction molding machine are as follows: the vibration frequency is controlled at 50 Hz, the static pressure is controlled at 40 kg, and the time is controlled at 5 minutes.

[0050] The curing refers to curing at 35°C for 7 days.

[0051] Example 2

[0052] The invention discloses an inorganic high-strength artificial quartz stone, which is prepared from cement, quartz sand, quartz powder, a water reducer, a strengthening agent and deionized water; the strengthening agent comprises silica fume, alunite and composite basalt fiber.

[0053] The mass ratio of the cement, the quartz sand, the quartz powder, the water reducer, the strengthener and the deionized water is 32:35:30:0.3:9:10.

[0054] The mass ratio of the silica fume, the alunite and the composite basalt fiber is 3:2:4.

[0055] The cement is Portland cement.

[0056] The quartz sand is continuously graded quartz sand; the particle size distribution of the continuously graded quartz sand is 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-140 mesh, and the mass ratio is 3.2:3.5:2:1.5.

[0057] The particle size of the quartz powder is 320 mesh.

[0058] The water reducer is a polycarboxylate water reducer.

[0059] The particle size of the alum stone is 300 meshes.

[0060] The composite basalt fiber is prepared by the following steps:

[0061] Step A: adding 3 parts by weight of basalt fiber A to 80 parts by weight of sodium hydroxide solution, stirring at 60° C. for 1 hour, filtering, taking the filter residue, washing with deionized water, and finally vacuum drying at 80° C. until constant weight, to obtain component A;

[0062] Step B: adding 3 parts by weight of sodium carboxymethyl cellulose and 5 parts by weight of component A to 80 parts by weight of deionized water, stirring at 65° C. for 2 hours, filtering, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 80° C. until constant weight, to obtain modified basalt fiber A;

[0063] Step C: Modified basalt fiber A and basalt fiber B are mixed at a mass ratio of 1.2:2 to complete the preparation.

[0064] The concentration of the sodium hydroxide solution in step A is 0.7 mol / L.

[0065] The diameter of the basalt fiber A in step A is 15 μm; the length of the basalt fiber A is 5 mm; and the tensile strength of the basalt fiber A is 4000 MPa.

[0066] In step C, the diameter of the basalt fiber B is 15 μm; the length of the basalt fiber B is 15 mm; and the tensile strength of the basalt fiber B is 4000 MPa.

[0067] A method for preparing inorganic high-strength artificial quartz stone, the preparation method comprising the following steps:

[0068] Add cement and water reducing agent to deionized water, then stir for 3 minutes at room temperature, then add quartz sand, quartz powder and strengthening agent, continue stirring for 5 minutes at room temperature, pour into the mold, vibrate and form using a vibration compaction molding machine under vacuum, demold, cure, cool naturally to room temperature, polish, cut, and the preparation is complete.

[0069] The vacuum degree of the vacuum state is -0.1 MPa.

[0070] The operating parameters of the vibration compaction molding machine are as follows: the vibration frequency is controlled at 50 Hz, the static pressure is controlled at 50 kg, and the time is controlled at 5 minutes.

[0071] The curing refers to curing at 40°C for 7 days.

[0072] Example 3

[0073] The invention discloses an inorganic high-strength artificial quartz stone, which is prepared from cement, quartz sand, quartz powder, a water reducer, a strengthening agent and deionized water; the strengthening agent comprises silica fume, alunite and composite basalt fiber.

[0074] The mass ratio of the cement, the quartz sand, the quartz powder, the water reducer, the strengthener and the deionized water is 31:35:27:0.25:9:9.

[0075] The mass ratio of the silica fume, the alunite and the composite basalt fiber is 3:2:3.5.

[0076] The cement is Portland cement.

[0077] The quartz sand is continuously graded quartz sand; the particle size distribution of the continuously graded quartz sand is 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-140 mesh, and the mass ratio is 3.1:3.5:2:1.5.

[0078] The particle size of the quartz powder is 310 mesh.

[0079] The water reducer is a polycarboxylate water reducer.

[0080] The particle size of the alum stone is 250 meshes.

[0081] The composite basalt fiber is prepared by the following steps:

[0082] Step A: Add 2.5 parts by weight of basalt fiber A to 80 parts by weight of sodium hydroxide solution, then stir at 50° C. for 1 hour, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 70° C. until constant weight, to obtain component A;

[0083] Step B: adding 2.5 parts by weight of sodium carboxymethyl cellulose and 4.5 parts by weight of component A to 80 parts by weight of deionized water, stirring at 63° C. for 2 hours, filtering, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 70° C. until constant weight, to obtain modified basalt fiber A;

[0084] Step C: Modified basalt fiber A and basalt fiber B are mixed at a mass ratio of 1.1:2 to complete the preparation.

[0085] The concentration of the sodium hydroxide solution in step A is 0.6 mol / L.

[0086] The diameter of the basalt fiber A in step A is 12 μm; the length of the basalt fiber A is 4 mm; and the tensile strength of the basalt fiber A is 3500 MPa.

[0087] In step C, the diameter of the basalt fiber B is 12 μm; the length of the basalt fiber B is 11 mm; and the tensile strength of the basalt fiber B is 3500 MPa.

[0088] A method for preparing inorganic high-strength artificial quartz stone, the preparation method comprising the following steps:

[0089] Add cement and water reducing agent to deionized water, then stir for 2.5 minutes at room temperature, then add quartz sand, quartz powder and strengthening agent, continue stirring for 4 minutes at room temperature, pour into the mold, vibrate and form using a vibration compaction molding machine under vacuum, demold, cure, cool naturally to room temperature, polish, cut, and the preparation is complete.

[0090] The vacuum degree of the vacuum state is -0.1 MPa.

[0091] The operating parameters of the vibration compaction molding machine are as follows: the vibration frequency is controlled at 50 Hz, the static pressure is controlled at 45 kg, and the time is controlled at 5 minutes.

[0092] The curing refers to curing at 38°C for 7 days.

[0093] Comparative Example 1

[0094] Based on Example 3, the silica fume was replaced with an equal weight of alunite, and the rest remained unchanged.

[0095] Comparative Example 2

[0096] On the basis of Example 3, the alunite was replaced with composite basalt fiber of equal weight, and the rest remained unchanged.

[0097] Comparative Example 3

[0098] On the basis of Example 3, the composite basalt fiber was replaced with silica fume of equal weight, and the rest remained unchanged.

[0099] Comparative Example 4

[0100] On the basis of Example 3, the composite basalt fiber was replaced with modified basalt fiber A of equal weight, and the rest remained unchanged.

[0101] Comparative Example 5

[0102] On the basis of Example 3, the composite basalt fiber was replaced with basalt fiber B of equal weight, and the rest remained unchanged.

[0103] Comparative Example 6

[0104] On the basis of Example 3, the length of the basalt fiber A was changed from 4 mm to 11 mm, and the rest remained unchanged.

[0105] Comparative Example 7

[0106] On the basis of Example 3, the length of the basalt fiber A was changed from 4 mm to 11 mm, and the length of the basalt fiber B was changed from 11 mm to 4 mm, and the rest remained unchanged.

[0107] Comparative Example 8

[0108] On the basis of Example 3, the sodium hydroxide solution was replaced by an equal weight of deionized water, and the rest remained unchanged.

[0109] Comparative Example 9

[0110] Based on Example 3, the sodium carboxymethyl cellulose was replaced by an equal weight of deionized water, and the rest remained unchanged.

[0111] Test Example 1

[0112] Strength test:

[0113] The inorganic high-strength artificial quartz stones prepared in Example 3 and Comparative Examples 1-9 were respectively subjected to bending strength tests according to standard GB / T35160.2-2017, wherein the specifications of the samples were all 200 mm*50 mm*50 mm.

[0114] Table 1. Strength test results

[0115] Bending strength / MPa Example 3 19.8 Comparative Example 1 15.2 Comparative Example 2 16.1 Comparative Example 3 15.8 Comparative Example 4 16.7 Comparative Example 5 16.2 Comparative Example 6 17.1 Comparative Example 7 17.6 Comparative Example 8 17.0 Comparative Example 9 17.4

[0116] From the comparison between Test Example 1, Example 3 and Comparative Examples 1-9, it can be seen that the inorganic artificial quartz stone prepared by the present invention has more excellent strength.

[0117] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An inorganic high-strength artificial quartz stone, characterized by: The inorganic high-strength artificial quartz stone is prepared from cement, quartz sand, quartz powder, water reducer, strengthening agent and deionized water; the strengthening agent includes silica fume, alum stone and composite basalt fiber; The composite basalt fiber is prepared by the following steps: step A: adding 2-3 parts by weight of basalt fiber A to 80 parts by weight of sodium hydroxide solution, stirring at 40-60° C. for 1 hour, filtering, taking the filter residue, washing with deionized water, and finally vacuum drying at 60-80° C. until constant weight, to obtain component A; step B: adding 2-3 parts by weight of sodium carboxymethyl cellulose and 4-5 parts by weight of component A to 80 parts by weight of deionized water, stirring at 60-65° C. for 2 hours, filtering, taking the filter residue, washing with deionized water, and finally vacuum drying at 60-80° C. until constant weight, to obtain modified basalt fiber A; step C: mixing the modified basalt fiber A and basalt fiber B in a mass ratio of 1-1.2:2, and the preparation is completed; The mass ratio of the cement, the quartz sand, the quartz powder, the water reducer, the strengthener and the deionized water is 30-32:35:25-30:0.2-0.3:9:8-10; the length of the basalt fiber A is 3-5 mm; and the length of the basalt fiber B is 10-15 mm.

2. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The mass ratio of the silica fume, the alunite and the composite basalt fiber is 3:2:3-4.

3. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The cement is Portland cement.

4. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The particle size of the alunite is 200-300 meshes.

5. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The concentration of the sodium hydroxide solution in step A is 0.5-0.7 mol / L.

6. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The diameter of the basalt fiber A in step A is 10-15 μm; the tensile strength of the basalt fiber A is 3500-4000 MPa.

7. The inorganic high-strength artificial quartz stone according to claim 1, characterized in that: The diameter of the basalt fiber B in step C is 10-15 μm; the tensile strength of the basalt fiber B is 3500-4000 MPa.

8. A method for preparing the inorganic high-strength artificial quartz stone according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: adding cement and a water reducing agent to deionized water, stirring and mixing at room temperature for 2-3 minutes, then adding quartz sand, quartz powder and a strengthening agent, stirring and mixing at room temperature for 3-5 minutes, pouring into a mold, vibrating and molding using a vibration compaction molding machine under vacuum, demoulding, curing, naturally cooling to room temperature, polishing, and cutting, thereby completing the preparation.