CN113735561B - Lotus leaf-imitated hydrophobic moisture-proof ceramic tile and preparation method thereof - Google Patents

Lotus leaf-imitated hydrophobic moisture-proof ceramic tile and preparation method thereof Download PDF

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CN113735561B
CN113735561B CN202110937692.2A CN202110937692A CN113735561B CN 113735561 B CN113735561 B CN 113735561B CN 202110937692 A CN202110937692 A CN 202110937692A CN 113735561 B CN113735561 B CN 113735561B
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ceramic tile
lotus leaf
green body
hydrophobic
circular
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CN113735561A (en
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刘一军
陆龙生
姚蔚
汪庆刚
吴洋
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Monalisa Group 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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/4838—Halogenated polymers
    • C04B41/4842—Fluorine-containing polymers
    • C04B41/4846—Perfluoro-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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/82—Coating or impregnation with organic materials
    • C04B41/83—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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
    • C04B2235/3454—Calcium silicates, e.g. wollastonite
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
    • C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite

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Abstract

The invention discloses a lotus leaf-imitated hydrophobic moisture-proof ceramic tile and a preparation method thereof. The preparation method comprises the following steps: preparing a green body with a circular raised array microstructure on the surface; preparing a green body with a circular raised array microstructure on the surface into a mature body by using a hydrothermal reaction; spraying fluorine-containing coating with low surface energy on the surface of the cooked blank; and curing the cured blank sprayed with the low-surface-energy fluorine-containing coating to obtain the lotus leaf-like hydrophobic moisture-proof ceramic tile. According to the preparation method, the micro-nano secondary composite structure of the circular convex array is constructed on the surface of the ceramic tile and coupled with a low surface energy treatment mode, so that the strong hydrophobic effect of the ceramic tile is obtained.

Description

Lotus leaf-imitated hydrophobic moisture-proof ceramic tile and preparation method thereof
Technical Field
The invention relates to the field of functional ceramic tiles, in particular to a lotus leaf-imitated hydrophobic moistureproof ceramic tile and a preparation method thereof.
Background
With the continuous progress of science and technology, people have higher and higher requirements on building ceramic tiles, and the building ceramic tiles are required to have good decorative performance and certain functionality. In coastal and subtropical climate areas of China, wet weather is heavy, rainfall is large, especially when the phenomenon of 'returning south to south' occurs, air humidity is close to saturation, and a large amount of water drops are attached to the surfaces of indoor ceramic tiles due to the fact that moisture in air is adsorbed. The wet ceramic tile is easy to cause the careless tumbling of adults and children, and meanwhile, fungi, bacteria and the like are easy to breed in the wet environment to cause the surface of the ceramic tile to be mildewed, thereby bringing great inconvenience to the daily life of people. Therefore, in order to improve the comfort of people in home life, the problem of water drop adhesion on the surface of the ceramic tile must be solved.
The conventional method employs ceramic tiles of composite structure to solve the above problems. For example, chinese patent CN 200217018U discloses a ground moisture-proof ceramic tile, wherein the surface of the ceramic tile is distributed with holes and is communicated with the pipeline inside the ceramic tile, the pipeline inside the ceramic tile is connected with a water filtering chamber to collect the water on the surface of the ceramic tile, and the lower part of the water filtering chamber is connected with a sewer through a communicating pipe, so that the ceramic tile can effectively discharge the water on the surface. The complex structure reduces the stability of the ceramic tile in practical application.
Disclosure of Invention
Aiming at the problems, the invention provides a lotus leaf-imitated hydrophobic moistureproof ceramic tile and a preparation method thereof.
In a first aspect, the invention provides a preparation method of a lotus leaf-imitated hydrophobic moisture-proof ceramic tile. The preparation method comprises the following steps:
preparing a green body with a circular raised array microstructure on the surface;
preparing a green blank with a circular raised array microstructure on the surface by using a hydrothermal reaction to prepare a mature blank;
spraying fluorine-containing coating with low surface energy on the surface of the cooked blank;
and curing the cured blank sprayed with the low-surface-energy fluorine-containing coating to obtain the lotus leaf-like hydrophobic moisture-proof ceramic tile.
According to the preparation method, the micro-nano composite structure on the lotus-like surface is introduced to the surface of the ceramic tile, when water drops contact with the surface of the ceramic tile, gaps exist between the water drops and the ceramic tile due to the micro-nano composite structure, the contact area between the ceramic tile and the water drops is reduced, and the hydrophobic and moisture-proof functionalization of the ceramic tile is favorably realized.
Preferably, the raw material composition of the green body comprises: 30-50% of ball clay, 20-30% of diatomite, 5-15% of albite, 5-15% of potassium feldspar, 5-15% of potassium sand, 5-10% of wollastonite, 1-3% of talc and 1-5% of bentonite in percentage by mass.
Preferably, the diameter of the circle in the circular bump array microstructure is 50-140 μm, the distance between bumps is 50-140 μm, and the bump height is 50-70 μm. The parameters of the circular bump array microstructure are controlled in the range, so that the surface decoration of the ceramic tile can be prevented from being influenced, and the raw material powder of the green body can be prevented from being adhered to the mold due to the small-size microstructure design, so that the microstructure is difficult to form on the surface of the green body through mold pressing.
Preferably, the technological conditions of the hydrothermal reaction are as follows: the hydrothermal temperature is 180-.
Preferably, the spraying amount of the low-surface-energy fluorine-containing coating is 60-200g/m 2 。
Preferably, the curing temperature is 100-120 ℃, and the curing time is 20-30 min.
Preferably, the raw materials of the green body are ball-milled uniformly with water to obtain slurry; drying and granulating the slurry to obtain powder for molding; and putting the powder into a mold with a circular pit array microstructure on the surface, and molding to obtain a green body.
Preferably, the grain diameter of the powder is less than or equal to 500 mu m.
Preferably, the low surface energy fluorine-containing coating is a polytetrafluoroethylene coating; preferably, the polytetrafluoroethylene coating comprises 40-80wt% polytetrafluoroethylene and 20-60wt% butyl ester.
In a second aspect, the invention further provides the lotus leaf-imitated hydrophobic moisture-proof ceramic tile obtained by the preparation method. The lotus leaf-like hydrophobic moisture-proof ceramic tile takes water as a medium, the static contact angle is 142-151 degrees, and the rolling angle is 13.1-16.4 degrees.
Preferably, the specifications of the lotus leaf-imitated hydrophobic moisture-proof ceramic tile are 600mm long, 600mm wide and 600mm high and 3-6mm high.
Drawings
FIG. 1 is a schematic structural diagram of a circular raised array microstructure, wherein (a) is a top view and (b) is a side view;
FIG. 2 is a flow chart of the preparation of a lotus leaf-like hydrophobic moisture-proof ceramic tile;
FIG. 3 is the static contact angle of the lotus leaf-simulated hydrophobic moisture resistant ceramic tile of example 1.
Detailed Description
The present invention is further illustrated by the following examples, which are to be understood as merely illustrative of, and not restrictive on, the present invention. Unless otherwise specified, each percentage means a mass percentage.
The preparation method of the lotus leaf-like imitating hydrophobic moisture-proof ceramic tile is exemplarily described below.
And preparing a green body with a circular raised array microstructure on the surface.
The raw material composition of the green body comprises: by mass percentage, 30-50% of ball clay, 20-30% of diatomite, 5-15% of albite, 5-15% of potassium feldspar, 5-15% of potassium sand, 5-10% of wollastonite, 1-3% of talc and 1-5% of bentonite. In some embodiments, the chemical composition of the green body comprises: by mass percent, SiO 2 60-70％，Al 2 O 3 20-30％，K 2 O 1-5％，Na 2 O 1-2％，CaO 1-2％，MgO 1-2％。
The diatomite has a large number of nanometer-scale hole structures. In the subsequent hydrothermal reaction process, the original nano-scale pore structure of the diatomite is reserved, and the diatomite reacts with other raw materials of the green body to generate hydrothermal minerals which can promote the bonding among the raw materials of the green body and form a nano-scale pore structure different from the original structure of the diatomite by filling the pores of the diatomite or attaching to the surface of the pores of the diatomite. The nano hierarchical pore structure is coupled with the circular convex array microstructure, and plays a role similar to a micron-scale mastoid and a nanometer-scale wax layer on the surface of a lotus leaf.
And uniformly ball-milling the raw materials of the green body and water according to the mass ratio of 2:1-3:1 to obtain slurry. In the ball milling process, the ball milling rotating speed is 2000-2500 rpm, and the ball milling time is 15-30 minutes.
And drying and granulating the slurry to prepare powder for molding. The granulation is convenient to control the granularity of the powder and is beneficial to the subsequent hydrothermal reaction. The drying temperature may be 100-120 ℃. The drying time is 6-10 h. The granulation method includes, but is not limited to, spray granulation, dry extrusion granulation, and the like. The grain diameter of the powder is less than or equal to 500 mu m. As the preferable powder, the grain diameter of the material is less than or equal to 125 mu m. The powder with the fineness can ensure that the particles are contacted more closely in the reaction process and react more fully, thereby improving the hydrothermal reaction speed and the reaction degree. In some embodiments, the powder passes through a 100 mesh screen with a reject of up to 0.8 wt%.
And putting the powder into a mold with a circular pit array microstructure on the surface, and molding to obtain a green body. The circular pit array microstructure can be constructed on the surface of the mould by laser processing. The material of the die is not limited and can be stainless steel. In the examples, a die made of a 304L stainless steel sheet was used. Note that the pit positions of the mold correspond to the projection positions of the green body.
In some embodiments, a mold with a surface having a microstructure of circular array of pits is placed at the bottom of a mold cavity of a press, and the mold cavity is filled with a green powder material and shaped to form a green body with a microstructure of circular array of protrusions on the surface. The forming method includes but is not limited to dry pressing, roll forming and the like. For example, the molding pressure may be 15 to 20 MPa.
The circular diameter, the interval between the bulges and the bulge height of the circular bulge array microstructure can be adaptively changed according to requirements. For example, the diameter (d) of the circle is 50 to 140 μm, the pitch(s) between the protrusions is 50 to 140 μm, and the height of the protrusions is 50 to 70 μm.
And preparing a green blank with a circular raised array microstructure on the surface by using a hydrothermal reaction. The technological conditions of the hydrothermal reaction are as follows: the hydrothermal temperature is 180-. The hydrothermal reaction time is not less than 12h, which can ensure the sufficient hydrothermal reaction. Part of the raw materials of the ceramic tile blank reach the melting point in the (high temperature) firing process, so that the microstructure is heated and melted to be damaged. The hydrothermal reaction temperature is lower and does not reach the melting point of the raw material of the green body, and the circular raised array microstructure formed by pressing the die on the surface of the green body cannot be melted down due to the hydrothermal reaction. The green body is made into the clinker blank of the ceramic tile by a hydrothermal method, so that the deformation of the circular raised array microstructure on the surface of the green body caused by heating and melting in the high-temperature sintering process can be avoided, and a foundation is laid for the preparation of the hydrophobic moisture-proof ceramic tile. The hydrothermal reaction can be carried out in a hydrothermal reaction kettle.
And spraying the fluorine-containing coating with low surface energy on the surface of the cooked blank. May be a polytetrafluoroethylene coating. The polytetrafluoroethylene has lower surface energy and better bonding property with ceramics. The invention endows the surface of the ceramic tile with low surface energy by the low-surface-energy fluorine-containing coatingThe ceramic tile is characterized in that the ceramic tile is coupled with the circular raised array microstructure to obtain the hydrophobic moisture-proof ceramic tile with water drops capable of rolling on the surface of the ceramic tile. The spraying amount of the low surface energy fluorine-containing coating can be 60-200g/m 2 . The spray pattern may be air spray. In some embodiments, the polytetrafluoroethylene coating includes 40 to 80wt% polytetrafluoroethylene and 20 to 60wt% butyl ester.
And curing the cured blank sprayed with the low-surface-energy fluorine-containing coating to obtain the lotus leaf-like hydrophobic moisture-proof ceramic tile. The curing temperature may be 100-120 ℃. The curing temperature can promote the rapid curing of the low-surface-energy fluorine-containing coating, and simultaneously avoid the influence of the discoloration and yellowing of the coating caused by overhigh temperature on the surface decoration of the ceramic tile. The curing time can be 20-30 min.
The lotus leaf-like hydrophobic moisture-proof ceramic tile takes water as a medium, the static contact angle is 142-151 degrees, and the rolling angle is 13.1-16.4 degrees.
The preparation method provided by the invention is characterized in that lotus leaves are used as a bionic object, the bionics principle is applied to construct a circular protrusion array microstructure on the surface of a ceramic tile, and the ceramic tile surface is modified by low-surface-energy fluorine-containing coating to be in a hydrophobic state, so that the ceramic tile has a moisture-proof function. Compared with the traditional method for leading out the water on the surface of the ceramic tile, the lotus leaf-like hydrophobic moistureproof ceramic tile obtained by the preparation method disclosed by the invention directly inhibits the condensation of water vapor on the surface of the ceramic tile, so that the surface of the ceramic tile is continuously kept in a dry state, the moistureproof effect of the ceramic tile is obviously improved, the method is simple, efficient, good in controllability, and good in stability of the prepared finished product, and is suitable for industrial production.
The present invention will be described in detail by way of examples. It is also to be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention, and that certain insubstantial modifications and adaptations of the invention by those skilled in the art may be made in light of the above teachings. The specific process parameters and the like of the following examples are also merely one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below.
Example 1
The preparation method of the lotus leaf-imitated hydrophobic moisture-proof ceramic tile comprises the following steps:
step (1): taking 40% of ball clay, 23% of diatomite, 10% of albite, 10% of potassium feldspar, 5% of potassium sand, 8% of wollastonite, 2% of talcum and 2% of bentonite as raw materials of a green body, and uniformly ball-milling the raw materials and water according to the mass ratio of 2.5:1 to prepare slurry; drying and granulating the slurry, and then sieving the slurry with a 100-mesh sieve to obtain powder;
step (2): placing a mold with a circular pit array microstructure built on the surface at the bottom of a mold cavity of a press, filling the mold cavity with the powder prepared in the step (1), and molding into a green body with a circular bulge array microstructure on the surface under the molding pressure of 16 MPa; the circular diameter of the circular bump array microstructure is 50 micrometers, the space between bumps is 50 micrometers, and the height of the bumps is 60 micrometers;
and (3): reacting the green body in a hydrothermal reaction kettle for 15 hours at the temperature of 180 ℃ and under the pressure of 1MPa to prepare a cooked blank; and (4): and spraying polytetrafluoroethylene coating on the cooked blank, and curing at 100 ℃ for 30min to obtain the lotus leaf-imitated hydrophobic moisture-proof ceramic tile.
The static contact angle was measured by a contact angle measuring instrument model C2000D1 in the morning of shanghai. Roll angle the sliding angle was measured by the inclined plate method. The volume of the test water drop was 8. mu.l. After randomly selecting an area on each sample surface and performing six measurements, an average value was taken as a test result to reduce errors.
The lotus leaf-like hydrophobic moistureproof ceramic tile takes water as a medium, and has a static contact angle of 149 degrees and a rolling angle of 15.1 degrees.
Example 2
The preparation method of the lotus leaf-imitated hydrophobic moisture-proof ceramic tile comprises the following steps:
step (1): taking 38% of ball clay, 22% of diatomite, 10% of albite, 10% of potassium feldspar, 7% of potassium sand, 6% of wollastonite, 4% of talcum and 3% of bentonite as raw materials of a green body, and uniformly ball-milling the raw materials and water according to the mass ratio of 3:1 to prepare slurry; drying and granulating the slurry, and then sieving the slurry with a 100-mesh sieve to obtain powder;
step (2): placing a die with a circular pit array microstructure built on the surface at the bottom of a die cavity of a press, filling the die cavity with the powder prepared in the step (1), and forming into a green body with a circular bulge array microstructure on the surface under the forming pressure of 15 MPa; the circular diameter of the circular bump array microstructure is 110 micrometers, the space between bumps is 80 micrometers, and the height of the bumps is 50 micrometers;
and (3): reacting the green body in a hydrothermal reaction kettle at the temperature of 200 ℃ and the pressure of 1.5MPa for 20 hours to prepare a mature body;
and (4): and spraying polytetrafluoroethylene coating on the cooked blank, and curing at 120 ℃ for 20min to obtain the lotus leaf-imitated hydrophobic moisture-proof ceramic tile.
The lotus leaf-like hydrophobic moistureproof ceramic tile takes water as a medium, the static contact angle is 149.2 degrees, and the rolling angle is 15.1 degrees.
Example 3
The preparation method of the lotus leaf-imitated hydrophobic moisture-proof ceramic tile comprises the following steps:
step (1): taking 30% of ball clay, 28% of diatomite, 12% of albite, 12% of potassium feldspar, 6% of potassium sand, 8% of wollastonite, 2% of talcum and 2% of bentonite as raw materials of a green body, and uniformly ball-milling the raw materials and water according to the mass ratio of 2:1 to prepare slurry; drying and granulating the slurry, and then sieving the slurry with a 100-mesh sieve to obtain powder;
step (2): placing a die with a circular pit array microstructure built on the surface at the bottom of a die cavity of a press, filling the die cavity with the powder prepared in the step (1), and forming into a green body with a circular bulge array microstructure on the surface under the forming pressure of 17 MPa; the circular diameter of the circular bump array microstructure is 80 μm, the space between bumps is 140 μm, and the height of the bumps is 60 μm;
and (3): reacting the green body in a hydrothermal reaction kettle at the temperature of 190 ℃ and the pressure of 1.25MPa for 18h to prepare a mature body;
and (4): and spraying polytetrafluoroethylene coating on the cooked blank, and curing at 110 ℃ for 25min to obtain the lotus leaf-imitated hydrophobic moisture-proof ceramic tile.
The lotus leaf-like hydrophobic moisture-proof ceramic tile takes water as a medium, the static contact angle is 148.2 degrees, and the rolling angle is 16.2 degrees.
Comparative example 1
The preparation method of the hydrophobic ceramic tile comprises the following steps:
step (1): taking 32% of ball clay, 25% of diatomite, 15% of albite, 15% of potassium feldspar, 6% of potassium sand, 5% of wollastonite, 1% of talcum and 1% of bentonite as raw materials of a green body, and uniformly ball-milling the raw materials and water according to the mass ratio of 2.5:1 to prepare slurry; drying and granulating the slurry, and then sieving the slurry with a 100-mesh sieve to obtain powder;
step (2): placing a die with a circular pit array microstructure built on the surface at the bottom of a die cavity of a press, filling the die cavity with the powder prepared in the step (1), and forming into a green body with a circular bulge array microstructure on the surface under the forming pressure of 15 MPa; the circular diameter of the circular bump array microstructure is 80 μm, the space between bumps is 140 μm, and the height of the bumps is 70 μm;
and (3): the green body is sent to a kiln line for sintering, the maximum sintering temperature is 1050 ℃, the sintering time is 65 minutes, and a cooked blank is prepared;
and (4): and spraying polytetrafluoroethylene coating on the cooked blank, and curing for 25min at 110 ℃ to obtain the hydrophobic ceramic tile.
The hydrophobic ceramic tile takes water as a medium, the static contact angle is 118 degrees, water drops cannot roll on the surface of the ceramic tile, and the hydrophobic effect is basically not obviously different from that of the conventional ceramic tile directly sprayed with polytetrafluoroethylene coating for modification treatment. The reason is that the microstructure formed by mould pressing on the surface of the green body in a high-temperature sintering environment at 1050 ℃ is subjected to melting deformation, so that a micro-nano composite structure cannot be constructed on the surface of the green body, and a remarkable high hydrophobic effect cannot be realized.
Comparative example 2
The preparation method of the hydrophobic ceramic tile comprises the following steps:
step (1): taking 40% of ball clay, 24% of diatomite, 8% of albite, 8% of potassium feldspar, 10% of potassium sand, 6% of wollastonite, 2% of talcum and 2% of bentonite as raw materials, and uniformly ball-milling the raw materials and water according to the mass ratio of 2:1 to obtain slurry; drying and granulating the slurry, and then sieving the slurry with a 100-mesh sieve to obtain powder;
step (2): placing a mold with a circular pit array microstructure on the surface at the bottom of a mold cavity of a press, filling the mold cavity with the powder prepared in the step (1), and forming a green body under the forming pressure of 16 MPa; the circular diameter of the circular pit array microstructure is 30 micrometers, the space between the bulges is 50 micrometers, and the height of the bulges is 30 micrometers;
and (3): reacting the green body in a hydrothermal reaction kettle at the temperature of 190 ℃ and the pressure of 1.25MPa for 18 hours to prepare a mature body;
and (4) spraying polytetrafluoroethylene coating on the cooked blank, and curing for 30min at 100 ℃ to obtain the hydrophobic ceramic tile.
The hydrophobic ceramic tile takes water as a medium, the static contact angle is 130 degrees, and water drops cannot roll on the surface of the ceramic tile. The reason is that the size of the microstructure of the mold (stainless steel template) is too small, and the powder and the mold have serious adhesion phenomena, so that a special circular convex array microstructure cannot be formed on the surface of a green body, and therefore, the static contact angle between the surface of a ceramic tile and water is relatively low, and water drops cannot roll on the surface of the ceramic tile.

Claims (9)

1. A preparation method of a lotus leaf-imitated hydrophobic moistureproof ceramic tile is characterized by comprising the following steps:
preparing a green body with a circular raised array microstructure on the surface; the diameter of a circle in the circular bump array microstructure is 50-140 mu m, the space between bumps is 50-140 mu m, and the bump height is 50-70 mu m;
preparing a green blank with a circular raised array microstructure on the surface by using a hydrothermal reaction to prepare a mature blank; the technological conditions of the hydrothermal reaction are as follows: the hydrothermal temperature is 180-;
spraying fluorine-containing coating with low surface energy on the surface of the cooked blank;
and curing the cured blank sprayed with the low-surface-energy fluorine-containing coating to obtain the lotus leaf-like hydrophobic moisture-proof ceramic tile.
2. The method of claim 1, wherein the raw material composition of the green body comprises: by mass percentage, 30-50% of ball clay, 20-30% of diatomite, 5-15% of albite, 5-15% of potassium feldspar, 5-15% of potassium sand, 5-10% of wollastonite, 1-3% of talc and 1-5% of bentonite.
3. The method according to claim 1, wherein the low surface energy fluorine-containing coating material is sprayed in an amount of 60 to 200g/m 2 。
4. The method as claimed in claim 1, wherein the curing temperature is 100-120 ℃ and the curing time is 20-30 min.
5. The method for preparing the ceramic material according to claim 1, wherein the raw material of the green body is ball-milled with water to obtain a slurry; drying and granulating the slurry to obtain powder for molding; and placing the powder into a mold with a circular pit array microstructure on the surface, and molding to obtain a green body.
6. The method according to claim 5, wherein the powder has a particle size of 500 μm or less.
7. The method of claim 1, wherein the low surface energy fluorine-containing coating is a polytetrafluoroethylene coating.
8. The method of claim 7, wherein the polytetrafluoroethylene coating comprises 40 to 80wt% of polytetrafluoroethylene and 20 to 60wt% of butyl ester.
9. The lotus leaf-like hydrophobic moisture-proof ceramic tile obtained by the preparation method according to any one of claims 1 to 8, wherein the lotus leaf-like hydrophobic moisture-proof ceramic tile has a static contact angle of 142-151 degrees with water as a medium, and a rolling angle of 13.1-16.4 degrees.
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ATE285390T1 (en) * 1999-10-29 2005-01-15 Erlus Baustoffwerke METHOD FOR GENERATING SELF-CLEANING PROPERTIES OF CERAMIC SURFACES
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