WO2021092986A1

WO2021092986A1 - Self-cleaning artificial stone plate for outdoor use and preparation method therefor

Info

Publication number: WO2021092986A1
Application number: PCT/CN2019/119777
Authority: WO
Inventors: 刘福财; 肖敏; 郑增勇; 汪鹏飞; 黎浩; 黄贺明
Original assignee: 广东特耐石新材料科技有限公司
Priority date: 2019-11-15
Filing date: 2019-11-20
Publication date: 2021-05-20
Also published as: CN110818329A; CN110818329B

Abstract

A self-cleaning artificial stone plate for outdoor use and a preparation method therefor, the self-cleaning artificial stone plate for outdoor use being prefabricated from an ultra-high performance mineral powder with a compressive strength of 100-150 MPa, and the ultra-high performance mineral powder comprising the following raw materials in parts by weight: 80-100 parts of a mineral active powder, 8-13 parts of titanium dioxide, 150-220 parts of a self-cleaning aggregate, 4-8 parts of nano-silica, 0.5-2 parts of a hydrophobic agent, 10-15 parts of water, 2-4 parts of a water reducing agent, and 4-10 parts of a pigment, the self-cleaning aggregate being made by modifying one or a combination of quartz sand, river sand, and machine-made sand with a particle size of 20-70 mesh. The artificial stone plate has good volume stability, good self-cleaning performance, low shrinkage, no warping and deformation in use, very low water absorption rate, good durability, no problems such as ageing, good surface stain resistance, and low overall comprehensive costs, and is suitable for popularisation.

Description

Self-cleaning artificial stone slab for outdoor use and preparation method thereof

Technical field

The invention relates to the technical field of artificial stone, and more specifically, to a self-cleaning artificial stone slab for outdoor use and a preparation method thereof.

Background technique

With the upgrading of material manufacturing technology and equipment, people's aesthetics and quality requirements, artificial slate has high strength, high flame retardancy, high weather resistance, high acid and alkali resistance, wide color options, realistic imitation stone effect, and good decorative effect. , Suitable for factory production, convenient construction, etc., making it a decorative material for interior and exterior walls of various high-end buildings today.

With the development of the industrial economy, industrial waste gas, automobile exhaust, smog and other pollution will follow one after another. The artificial stone decorative board used in building outdoor is inevitably polluted. These pollutants can easily form strong adhesion on the surface of the artificial stone slab. It is difficult to wash it clean by rain washing. Moreover, due to gravity and the scouring force of rain, the pollutants will be pushed and pulled down, forming strip-shaped traces of pollutants on the surface of the board, which will seriously affect

The exterior decoration effect of the board surface and the aesthetics of the building. Under the current conditions, the "Spiderman" can only be manually cleaned up on a regular basis, which consumes a large amount of cleaning agents. Especially the cleaning of the curtain walls of high-rise buildings poses a threat to the personal safety of the "Spiderman" and causes a waste of social resources.

Titanium dioxide is a semiconductor material with good chemical stability, photocatalytic activity and superhydrophilicity. It is safe and non-toxic, and has a low cost. It has been widely used, such as white pigments and porcelain glazes, vehicle decorations , Building surface cooling, food additives, brighteners, etc. Titanium dioxide has good photocatalytic activity and light-induced super-hydrophilicity under sunlight. It has the functions of self-cleaning, antibacterial, disinfection, air and water purification, and has been put into use in many industries such as construction, transportation, and new energy. . The application number is 201910572001.6, and the Chinese invention patent application named as a real stone paint with good anti-fouling and self-cleaning ability and its preparation method uses titanium dioxide nanosheets to prepare real stone paint with good anti-fouling and self-cleaning ability, but real stone paint It is a resin matrix, which is prone to aging and other phenomena, has poor interface adhesion with the slate, and is prone to peeling. However, there are few practical applications of titanium dioxide directly used in building boards.

Therefore, researching a new type of inorganic decorative board that integrates self-cleaning function, good decorative effect, good durability, and realistic stone-like effect is the development direction of the building decoration material industry.

Self-cleaning artificial stone slab for outdoor use is a new type of inorganic decorative board developed in response to the shortcomings of the above-mentioned traditional outdoor decorative board. It has good volume stability, good self-cleaning performance, low shrinkage, no warpage and deformation, extremely low water absorption, and durability. It has good performance, good mechanical properties, good decorative effect, good stain resistance and waterproof performance. It can be widely used in outdoor architectural decoration. This product has broad market application prospects and will lead the development direction of inorganic decorative panels in the future.

Summary of the invention

In view of this, the present invention overcomes at least one of the shortcomings described in the prior art, and provides a product with good volume stability, good self-cleaning performance, low shrinkage, no warpage and deformation in use, extremely low water absorption, and durability. The artificial stone slab has good mechanical properties, good decorative effect, good stain resistance and waterproof performance and its preparation method, which solves the problem that traditional outdoor decorative plates are susceptible to outdoor organic matter and dust pollution and are not easy to clean.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A self-cleaning artificial stone slab for outdoor use, prefabricated from ultra-high-performance mineral powder with a compressive strength of 100-150 MPa. The ultra-high-performance mineral powder includes the following raw material components in parts by weight: mineral active powder 80-100 parts of body, 8-13 parts of titanium dioxide, 150-220 parts of self-cleaning aggregate, 4-8 parts of nano-silica, 0.5-2 parts of water repellent, 10-15 parts of water, 2~ water reducing agent 4 parts, 4-10 parts of pigments, the self-cleaning aggregate is one or more combinations of quartz sand, river sand, and machine-made sand with a particle size of 20-70 mesh, soaked in micro-silica powder, nano-titanium dioxide, It is obtained from a self-cleaning photocatalytic suspension slurry formed by cement, microbead powder, quartz stone powder, dispersant, retarding water reducing agent, water, and thickening agent.

The mass ratio of cement, microsilica powder, nano titanium dioxide, microbead powder, quartz stone powder, dispersant, retarding type water reducing agent, water, and thickening agent in the self-cleaning photocatalytic suspension slurry is 1:0.05 ～0.15: 0.05～0.10: 0.10～0.20: 0.05～0.15: 0.003～0.006: 0.005～0.02: 0.25～0.4: 0.0001～0.0003, control the slurry concentration at 75～85%, and the slurry fluidity at 250～300mm. After cleaning the quartz sand or river sand or machine-made sand to make the surface pH not less than 10, soak it in the self-cleaning photocatalytic suspension slurry, so that the surface of the aggregate has a better affinity with the self-cleaning photocatalytic suspension slurry, and can exert alkali Stimulating effect to improve the bonding strength of the interface between the aggregate and the hydration product. In the cleaning process, first rinse with water to remove mud and mud and other debris until the clear water is discharged, then use pH 2 to 4 acetic acid solution to clean the surface weathering or corrosive materials, and finally use pH 10 to 12 sodium hydroxide solution or Soak in potassium hydroxide solution to control the surface pH value not less than 10.

Further, the cement with a mineral active powder of 42.5 or more is the main body mixed with one or more of silica fume, mineral powder, glass beads, and zeolite powder, and the mass ratio of the mineral active powder components is cement: Silica fume: mineral powder: glass beads: zeolite powder is 1:0.05～0.2:0.5～1:0～0.3:0～0.2.

Further, the titanium dioxide is anatase titanium dioxide with a particle size of 10 to 1000 nm. On the one hand, it uses its photocatalytic function to completely oxidize and degrade most organic pollutants into harmless inorganic small molecules such as water and carbon dioxide. On the one hand, it takes advantage of its photo-induced super-hydrophilicity to take the inorganic contaminants on the surface of the artificial stone away from the surface of the artificial stone under the rain, and keep the surface of the artificial stone as clean as new.

Further, the particle size of the nano-silica is 5-100 nm, which can improve the wear resistance, impermeability and waterproof performance of the artificial stone slab in the present invention.

Further, the water-repellent agent is polysiloxane or organic silicon, which plays a waterproof role in the present invention and improves the waterproof performance of the self-cleaning outdoor artificial stone slab.

The preparation method of the self-cleaning outdoor artificial stone slab includes the following steps:

S1. Calculate the amount of each raw material according to the ratio, and premix all the titanium dioxide and self-cleaning aggregates for 2 to 4 minutes;

S2. Add all the mineral active powder, nano silica, water repellent, pigment and 40wt% water to the premixed aggregate obtained in step S1 and stir for 1 to 2 minutes;

S3. Add all the water reducing agent and the remaining 60% by weight of water to the pre-wet mixture obtained in step S2, and fully stir for 7-9 minutes to obtain the mixture for use;

S4. Prepare the mold, calculate according to the thickness and weigh the mixture prepared in step S3 to evenly distribute the material in the mold;

S5. In step S4, the mixture in the mold is covered with an isolation moisturizing film, and then placed in a vacuum chamber to be evacuated and exhausted;

S6. The vacuum-formed board in step S5 is cured at 40°C for 8-12 hours, and then heated to 80-90°C for 24 to 36 hours to obtain a rough board;

S7. Remove the insulating moisturizing film from the blank obtained in step S6, cut, calibrate, and polish, to obtain a self-cleaning outdoor artificial stone slab.

Further, in the step S3, the expansion degree of the stirring mixture material is 550-700 mm; the initial setting time after stirring and mixing is not less than 60 minutes; in the step S5, the vacuum time is not less than 60s, and the vacuum pressure is -0.07~ -0.1MPa; the thickness of the blank board in the step S6 is 600-1200mm; in the step S6, the humidity is maintained at 75% or more during the high-temperature curing process.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The self-cleaning outdoor artificial stone slab according to the present invention has good volume stability, good self-cleaning performance, low shrinkage, no warpage and deformation, extremely low water absorption, good durability, good mechanical properties, and good decorative effects , Good stain resistance and waterproof performance, compressive strength of 100-150 MPa, electric flux less than 100 Coulomb, etc.

(2) In the preparation method of self-cleaning outdoor artificial stone slabs according to the present invention, the consumption of molds is small, the mold turnover period is short, and the cutting efficiency is high, which solves the problems of high consumption and high cost of traditional decorative concrete slab molds, and saves production costs. .

(3) The self-cleaning outdoor artificial slate of the present invention has a wide range of raw materials, can realize industrialized production, has high production efficiency, is a green energy-saving and environmentally friendly product, and has economic and social benefits.

(4) In the preparation method of the self-cleaning outdoor artificial stone slab according to the present invention, vacuum degassing is adopted to improve the compactness of the inorganic artificial stone slab and improve the mechanical and durability performance.

(5) The self-cleaning outdoor artificial stone slab according to the present invention adopts anatase titanium dioxide, which utilizes its photocatalytic function and photo-induced superhydrophilicity to improve the self-cleaning performance of the artificial stone slab.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments.

Example 1

A self-cleaning artificial stone slab for outdoor use, prefabricated from ultra-high-performance mineral powder with a compressive strength of 100-150 MPa. The ultra-high-performance mineral powder includes the following raw material components in parts by weight: mineral active powder 80 parts of body, 8 parts of titanium dioxide, 150 parts of self-cleaning aggregate, 4 parts of nano-silica, 0.5 part of water repellent, 10 parts of water, 2 parts of water reducing agent, 4 parts of pigment, the self-cleaning aggregate One or more combinations of quartz sand, river sand, and machine-made sand with a particle size of 20-70 mesh, soaked in silica fume, nano-titanium dioxide, cement, bead powder, quartz powder, dispersant, retarder after cleaning It is obtained by self-cleaning photocatalytic suspension slurry formed by water reducing agent, water and thickening agent.

The mass ratio of cement, microsilica powder, nano titanium dioxide, microbead powder, quartz stone powder, dispersant, retarding type water reducing agent, water, and thickening agent in the self-cleaning photocatalytic suspension slurry is 1:0.05 : 0.05: 0.10: 0.05: 0.003: 0.005: 0.25: 0.0001, control the slurry concentration at 75-85%, and the slurry fluidity at 250-300mm. The silicon dioxide content of the microsilica powder is not less than 85%, the activity index is greater than 100%, and the average particle diameter is 0.18um; the nanometer titanium dioxide is anatase crystal type with an average particle diameter of 0.13um; the cement requires 42.5 Grade or above; the activity index of the microbead powder is greater than 75%, and the fineness is greater than 300 mesh; the fineness of the quartz stone powder is above 800 mesh, and the silicon dioxide content is 93%; the dispersant includes sodium hexametaphosphate and polyacrylic acid One or more of sodium dodecylbenzene sulfonate; the water reducing rate of the retarding type water reducing agent is greater than 30%, and the retarding time is 2 to 4 hours; the thickening agent is methyl fiber Vegetarian. The test piece made of the self-cleaning photocatalytic suspension slurry has a 28-day compressive strength of not less than 80 MPa, a tensile strength of not less than 3.5 MPa, and a water absorption rate of less than 1%. After cleaning the quartz sand or river sand or machine-made sand to make the surface pH not less than 10, soak it in the self-cleaning photocatalytic suspension slurry, so that the surface of the aggregate has a better affinity with the self-cleaning photocatalytic suspension slurry, and can exert alkali Stimulating effect to improve the bonding strength of the interface between the aggregate and the hydration product. In the cleaning process, first rinse with water to remove mud and mud and other debris until the clear water is discharged, then use pH 2 to 4 acetic acid solution to clean the surface weathering or corrosive materials, and finally use pH 10 to 12 sodium hydroxide solution or Soak in potassium hydroxide solution to control the surface pH value not less than 10.

The mineral active powder 42.5 or more cement is the main body mixed with silica fume, mineral powder, glass beads, and zeolite powder. The mass ratio of the mineral active powder components is cement: silica fume: mineral powder: glass beads: zeolite powder. 1:0.125:0.75:0.15:0.1.

The titanium dioxide is anatase titanium dioxide with a particle size of 10 to 1000 nm. On the one hand, it uses its photocatalytic function to completely oxidize and degrade most organic pollutants into harmless inorganic small molecules such as water and carbon dioxide. On the other hand, it uses Its light-induced super-hydrophilicity will take the inorganic contaminants on the artificial stone surface away from the artificial stone slab surface under rain washing, and keep the artificial stone slab surface clean as new.

The particle size of the nano-silica is 5-100 nm, which can improve the wear resistance, impermeability and waterproof performance of the artificial stone slab in the present invention.

The water-repellent agent is polysiloxane or organic silicon, which plays a waterproof role in the present invention and improves the waterproof performance of the self-cleaning outdoor artificial stone slab.

S3. Add all the water reducing agent and the remaining 60wt% of water to the pre-wet mixture obtained in step S2, fully stir for 7-9 minutes, the expansion degree of the stirred mixture material is 550-700mm, and the initial setting time after stirring and mixing is not Less than 60 minutes, get the mixture, set aside;

S5. In step S4, the mixture in the mold is covered with an isolation moisturizing film, and then put into a vacuum chamber to be evacuated and exhausted. The evacuation time is not less than 60s, and the vacuum pressure is -0.07～-0.1MPa, the step S6 The thickness of the medium blank board is 600～1200mm;

S6. The vacuum-formed board in step S5 is cured at 40°C for 8-12 hours, and then heated to 80-90°C for 24 to 36 hours to obtain a blank board, and the humidity is maintained above 75% during the high-temperature curing process;

Example 2

In addition to the different formulations of ultra-high-performance mineral powder, other conditions are the same as in Example 1.

The ultra-high-performance mineral powder includes the following raw material components in parts by weight: 100 parts of mineral active powder, 13 parts of titanium dioxide, 220 parts of self-cleaning aggregate, 8 parts of nano silica, 2 parts of water repellent, 15 parts of water, 4 parts of water reducing agent, 10 parts of pigment.

Example 3

Except for the different formulations of the ultra-high-performance mineral powder, other conditions are the same as in Example 1.

The ultra-high-performance mineral powder includes the following raw material components in parts by weight: 85 parts by weight of mineral active powder, 9.5 parts by titanium dioxide, 170 parts by self-cleaning aggregate, 5 parts by nano silica, 0.9 parts by water repellent, 11 parts of water, 2.5 parts of water reducing agent, 5.5 parts of pigment.

Example 4

The ultra-high-performance mineral powder includes the following raw material components in parts by weight: 95 parts of mineral active powder, 11.5 parts of titanium dioxide, 200 parts of self-cleaning aggregates, 7 parts of nano silica, 1.6 parts of water repellent, 14 parts of water, 3.5 parts of water reducing agent, 8.5 parts of pigment. The mineral active powder is mainly composed of cement of 42.5 or more mixed with silica fume and mineral powder, and the mass ratio of the components of the mineral active powder is cement: silica fume: mineral powder of 1:0.05:0.5. The mass ratio of cement, microsilica powder, nano titanium dioxide, microbead powder, quartz stone powder, dispersant, retarding type water reducing agent, water, and thickening agent in the self-cleaning photocatalytic suspension slurry is 1:0.15 : 0.10: 0.20: 0.15: 0.006: 0.02: 0.4: 0.0003.

Example 5

The ultra-high performance mineral powder includes the following raw material components in parts by weight: 90 parts of mineral active powder, 10.5 parts of titanium dioxide, 185 parts of self-cleaning aggregates, 6 parts of nano silica, 1.25 parts of water repellent, 12.5 parts of water, 3 parts of water reducing agent, 7 parts of pigment. The mineral active powder is mainly composed of cement above 42.5 and mixed with silica fume, mineral powder, glass beads, and zeolite powder. The mass ratio of the mineral active powder components is cement: silica fume: mineral powder: glass beads: zeolite powder It is 1:0.2:1:0.3:0.2. The mass ratio of cement, microsilica powder, nano titanium dioxide, microbead powder, quartz stone powder, dispersant, retarding type water reducing agent, water, and thickening agent in the self-cleaning photocatalytic suspension slurry is 1:1 : 0.075: 0.15: 0.10: 0.0045: 0.0125: 0.325: 0.0002.

Comparative example 1

In addition to 60 parts of mineral active powder, other conditions are the same as in Example 1.

Comparative example 2

Except for 3 parts of titanium dioxide, other conditions are the same as in Example 1.

Comparative example 3

Except that the self-cleaning type aggregate adopts machine-made sand, the other conditions are the same as in Example 1.

Comparative example 4

Except that step S5 does not perform vacuum exhaust, other conditions are the same as in Example 1.

Comparative example 5

Except for the quartz sand, river sand, or machine-made sand used to prepare self-cleaning aggregates, no acetic acid solution with a pH value of 2 to 4 is used to clean the surface weathering or corrosive material, other conditions are the same as in Example 1.

Comparative example 6

Except for the quartz sand or river sand or machine-made sand used to prepare self-cleaning aggregates, the surface pH after cleaning is lower than 10, other conditions are the same as in Example 1.

Comparative example 7

Except that the slurry concentration of the self-cleaning photocatalytic suspension slurry is less than 75% and the slurry fluidity is less than 250 mm, other conditions are the same as in Example 1.

Comparative example 8

Except that the self-cleaning photocatalytic suspension slurry is replaced with nano-titanium dioxide dispersion, other conditions are the same as in Example 1.

The self-cleaning artificial stone slabs prepared in the above Examples 1 to 5 and Comparative Examples 1 to 8 were made into standard test pieces for performance testing. The test results are shown in Table 1:

Table 1 Performance test results of self-cleaning artificial slate

From Table 1, comparative example 1, 60 parts of mineral active powder, compared with example 1, both compressive strength and light-induced superhydrophilicity decreased more, and the photocatalytic activity decreased less; comparative example 2 titanium dioxide 3 parts, Compared with Example 1, the compressive strength is basically unchanged, and the light-induced superhydrophilicity and photocatalytic activity are both reduced. Comparative Example 3 uses machine-made sand for the self-cleaning aggregate. Compared with Example 1, the compressive strength is basically the same. In contrast, the light-induced superhydrophilicity and photocatalytic activity decreased significantly; Comparative Example 4 did not perform vacuum degassing. Compared with Example 1, both the compressive strength and light-induced superhydrophilicity decreased significantly, and the photocatalytic activity decreased significantly. Less; In Comparative Example 5, the aggregates cleaned by quartz sand or river sand or machine-made sand do not need to clean the surface weathering or corrosion products with a pH value of 2 to 4 acetic acid solution for 3-5 minutes. Compared with Example 1, the compressive strength is slightly Decrease, the light-induced superhydrophilicity decreased more, and the photocatalytic activity decreased less; in Comparative Example 6, the surface pH value of quartz sand or river sand or machine-made sand was lower than 10 after cleaning. Compared with Example 1, the compressive strength was slightly There is a decrease, the photo-induced superhydrophilicity decreases more, and the photocatalytic activity decreases less; the slurry concentration of the self-cleaning photocatalytic suspension slurry in Comparative Example 7 is less than 75%, and the slurry fluidity is less than 250mm. 1 In comparison, the compressive strength is slightly decreased, and the light-induced superhydrophilicity and photocatalytic activity are both decreased more; in Comparative Example 8, the self-cleaning photocatalytic suspension slurry is replaced with nano-titanium dioxide dispersion liquid. Compared with Example 1, the compressive resistance The intensity decreases slightly, and the light-induced superhydrophilicity and photocatalytic activity both decrease more. Through a large number of experiments, the types of mineral active powder, titanium dioxide, and aggregate selected in the present invention are the best; the porous structure of the aggregate can increase the surface area of the titanium dioxide carrier and increase the content of titanium dioxide exposed on the surface, thereby improving the artificial stone slab Self-cleaning performance; vacuum defoaming can improve the compactness of the decorative panel, thereby improving the mechanical properties, stain resistance, waterproof performance, and self-cleaning performance of the decorative panel.

Obviously, the above-mentioned embodiments of the present invention are merely examples to clearly illustrate the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other changes or modifications in different forms can be made on the basis of the above description. It is unnecessary and impossible to list all the implementation methods here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

A self-cleaning outdoor artificial stone slab and a preparation method thereof, characterized in that the self-cleaning outdoor artificial stone slab is prefabricated from ultra-high-performance mineral powder with a compressive strength of 100-150 MPa, and the ultra-high-performance mineral The powder includes the following raw material components in parts by weight: 80-100 parts of mineral active powder, 8-13 parts of titanium dioxide, 150-220 parts of self-cleaning aggregate, 4-8 parts of nano-silica, 0.5 parts of water repellent ～2 parts, 10-15 parts of water, 2～4 parts of water reducing agent, 4-10 parts of pigments, the self-cleaning aggregate is one of quartz sand, river sand and machine-made sand with a particle size of 20-70 mesh Or a variety of combinations after cleaning, soaked in micro-silica powder, nano-titanium dioxide, cement, micro-bead powder, quartz stone powder, dispersant, retarding type water reducing agent, water, thickening agent to form a self-cleaning photocatalytic suspension slurry system Got.
The self-cleaning outdoor artificial stone slab according to claim 1, wherein the mineral active powder of 42.5 or more cement is the main body mixed with one of silica fume, mineral powder, glass beads, and zeolite powder. For several active powders, the mass ratio of mineral active powder components is cement: silica fume: mineral powder: glass beads: zeolite powder: 1:0.05～0.2:0.5～1:0～0.3:0～0.2.
The self-cleaning artificial stone slab for outdoor use according to claim 1, wherein the titanium dioxide is anatase titanium dioxide with a particle size of 10-1000 nm.
The self-cleaning outdoor artificial stone slab according to claim 1, wherein the particle size of the nano-silica is 5-100 nm.
The self-cleaning artificial stone slab for outdoor use according to claim 1, wherein the water-repellent agent is polysiloxane or silicone.
A method for preparing self-cleaning artificial stone slabs for outdoor use according to any one of claims 1 to 5, characterized in that it comprises the following steps:

S1 Calculate the amount of each raw material according to the ratio, and premix all the titanium dioxide and self-cleaning aggregates for 2 to 4 minutes;

S2 Add all the mineral active powder, nano silica, water repellent, pigment and 40wt% water to the premixed aggregate obtained in step S1 and stir for 1 to 2 minutes;

S3: Add all the water reducing agent and the remaining 60wt% of water to the pre-wet mixture obtained in step S2, and fully stir for 7-9 minutes to obtain the mixture for use;

S4. Prepare the mold, calculate according to the thickness and weigh the mixture prepared in step S3 to evenly distribute the material in the mold;

S5. In step S4, the mixture in the mold is covered with an isolation moisturizing film, and then placed in a vacuum chamber for evacuating and exhausting;

S6. The vacuum-formed board in step S5 is cured at 40°C for 8-12 hours, and then heated to 80-90°C for 24 to 36 hours to obtain a rough board;

S7. Remove the isolating and moisture-retaining film from the blank plate obtained in step S6, cut, calibrate, and polish, to obtain a self-cleaning outdoor artificial stone slab.
The method for preparing self-cleaning outdoor artificial stone slabs according to claim 6, characterized in that in step S3, the expansion degree of the stirring mixture material is 550-700 mm; the initial setting time after stirring and mixing is not less than 60 minutes.
The preparation method of the self-cleaning outdoor artificial stone slab according to claim 6, characterized in that, in step S5, the vacuum time is not less than 60s, and the vacuum pressure is -0.07 to -0.1 MPa.
The method for preparing a self-cleaning outdoor artificial stone slab according to claim 6, wherein in step S6, the thickness of the blank slab is 600-1200 mm.
The method for preparing a self-cleaning outdoor artificial stone slab according to claim 6, wherein in step S6, the humidity is maintained at 75% or more during the high-temperature curing process.