A wall and floor tile glaze water barrier agent, a preparation method, a separation method and a production system

Abstract

The application discloses a kind of wall ground glaze tile glaze water barrier agent, preparation method, isolation method and production system, for bell shower glazing or flat seam duckbill shower glazing process, the end surface of the direction of advance of green brick is prone to glaze, the problem of roller kiln high-temperature sintering stick, glaze water barrier agent with hydrophobic modified inorganic powder as core skeleton, with water-based film-forming resin to form continuous film layer, with fluxing agent to ensure high-temperature fusion, each component realizes the effect of "low-temperature film-forming hydrophobic, high-temperature no residue fusion" in cooperation;By accurate coating special barrier agent on the end surface of green brick to form a hydrophobic isolation layer, block the contact channel of glaze and end surface, without additional glaze washing edge or glaze scraping edge equipment, it can completely solve the edge glaze, glaze waste and kiln roller stick due to glaze showering, nail defects, while reducing the breakage rate of body, adapt to large-size rock plate, thin plate and other multi-category product production, significantly improve glaze line production efficiency and product qualification rate.

Description

Technical Field

[0001] This invention relates to the field of building ceramics production technology, and in particular to a glaze water barrier agent for wall and floor glazed tiles, its preparation method, isolation method, and production system. Background Technology

[0002] In the automated production of glazed wall and floor tiles, bell-shaped glazing / flat-joint duckbill glazing has always been a core glazing process due to its high glazing efficiency and good glaze surface smoothness. Its basic principle is to use a slurry supply system to allow the glaze slurry to flow uniformly down from annular gaps or flat joints, forming a continuous and stable "glaze curtain." The tile blank passes horizontally through this glaze curtain on a conveyor belt, thus achieving uniform glazing on the surface. However, this process has inherent defects: during the glazing process, when a tile blank of a certain thickness horizontally cuts into and exits the vertically falling "glaze curtain," the two end faces (i.e., the front and rear edges) of the tile blank in the direction of travel inevitably have an additional layer of glaze adhering to them in the form of droplets or strips due to the adhesion effect of the fluid and surface tension. This phenomenon of glaze on the end face is not caused by equipment failure, parameter misalignment, or human error, but is an inherent structural defect of the "vertical curtain glazing + horizontal straight brick feeding" movement mode. It cannot be eliminated by adjusting conventional parameters such as glaze slurry specific gravity and flow rate. After high-temperature firing, the edge glaze softens and sticks to the kiln drive rollers, forming glassy hard nails, which causes the brick blank to deviate and break, while also shortening the service life of the rollers.

[0003] Existing solutions mostly involve adding equipment for washing and scraping glaze edges, but this is essentially a passive compensation method of "polluting first and then treating," which exposes three major technical drawbacks that are difficult to overcome in practical applications: First, the equipment investment and maintenance costs are high, and it is difficult to develop washing and scraping equipment that is compatible with large-size slabs / thin slabs; second, the washing and scraping process is prone to causing damage to the blank, reducing the yield; third, under high-speed glazing lines (≥15m / min), the washing and scraping action is slow to respond and cannot remove the glaze material from the end face, which will still cause roller sticking accidents. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a glaze water barrier agent for wall and floor glazed tiles, a preparation method, an isolation method, and a production system to solve one or more problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a water barrier agent for wall and floor glazed tiles, comprising the following raw materials in parts by weight: 25-40 parts of hydrophobic modified inorganic powder, 15-25 parts of water-based film-forming resin, 5-12 parts of flux, 2-5 parts of dispersant, 1-3 parts of thickener, and 20-35 parts of deionized water.

[0006] In one embodiment of the present invention, the hydrophobically modified inorganic powder is a hydrophobically treated kaolin / calcined alumina composite powder, wherein the mass ratio of kaolin to calcined alumina is 2:1; the hydrophobic treatment agent is a silane coupling agent; the aqueous film-forming resin is an acrylate resin / polyurethane resin composite system with a solid content of 30-40%; the flux is a zinc borate / barium carbonate composite system with a mass ratio of 1:1-2:1; the dispersant is a polycarboxylate dispersant; and the thickener is a hydroxyethyl cellulose / bentonite composite system.

[0007] In one embodiment of the present invention, the viscosity of the glaze barrier is 800-1500 mPa·s (25°C), the surface tension is ≤25 mN / m, the high-temperature decomposition temperature is ≥850°C, and the inorganic residue rate after firing is ≤0.5%.

[0008] To achieve the above objectives, the present invention also adopts the following technical solution: a method for preparing the above-mentioned glaze water barrier agent for wall and floor glazed tiles, comprising the following steps: (1) Preparation of hydrophobically modified inorganic powder: Kaolin and calcined alumina are mixed at a mass ratio of 2:1, and silane coupling agent is added as a hydrophobic treatment agent. The amount of silane coupling agent is 3-5% of the mass of inorganic powder. After stirring evenly, the powder is dried, ground, and passed through a 200-mesh sieve to obtain hydrophobically modified inorganic powder. (2) Base material preparation: Add dispersant and thickener to deionized water in sequence, and stir until completely dissolved to obtain water-based base material; (3) Preparation of barrier agent: Add hydrophobic modified inorganic powder, water-based film-forming resin and flux to water-based base material, stir at high speed for 30-60 min at a speed of 1500-2500 r / min to obtain a uniform suspension as glaze water barrier agent.

[0009] To achieve the above objectives, the present invention also adopts the following technical solution: a method for isolating wall and floor glazed tile glaze water barrier agent as described above, comprising the following steps: S1. Brick blank pretreatment: Before the brick blank is conveyed to the glazing station, the front end face and rear end face of the brick blank in the direction of forward movement are identified by the positioning device to confirm the isolation coating area; S2. Barrier coating: Apply glaze barrier agent evenly to the front and rear end faces of the brick blank by spot spraying or screen printing to form a hydrophobic isolation layer with a thickness of 0.02-0.08mm. S3. Pre-drying treatment: Using the residual heat of the brick blanks after they leave the drying kiln or an external drying device, control the temperature of the brick blanks to above 60℃ and dry them until the moisture content of the isolation layer is ≤1% to avoid the glaze slurry diluting the isolation layer during glazing. S4. Glazing and molding: The pre-dried brick blank is sent into the bell jar glazing or flat seam duckbill glazing station. The glaze flows down the surface of the brick blank, and the isolation layer prevents the glaze from adhering to the front end face and the rear end face. S5. Firing treatment: The glazed brick blanks are fired in the kiln, and the isolation layer volatilizes at high temperature.

[0010] In one embodiment of the present invention, in step S4, the glazing parameters are controlled as follows: glaze slurry level height 150-250mm, glaze slurry specific gravity 1.35-1.85g / cm³, glazing speed 5-20m / min, and glaze curtain thickness 5-8mm.

[0011] In one embodiment of the present invention, in step S2, when screen printing is used for coating, the mesh count of the screen is 120-180 mesh and the printing speed is 2-5 m / min; when point spraying is used for coating, the spraying pressure is 0.2-0.4 MPa and the distance between the nozzle and the end face of the brick blank is 10-20 cm.

[0012] To achieve the above objectives, the present invention also adopts the following technical solution: an isolation system for wall and floor glazed tile glaze water isolation method described above, comprising a blank conveying line, an end face positioning coating device, a pre-drying treatment zone, a glazing device, and a firing kiln arranged in sequence. The end-face positioning coating device includes a photoelectric sensor, a spraying / screen printing assembly, and a controller. The photoelectric sensor is electrically connected to the controller and is used to accurately identify the position of the brick blank end face. The controller is used to control the actions of the spraying / screen printing assembly.

[0013] In one embodiment of the present invention, the glazing device includes a glazing device, a glaze slurry level control component, and a flow rate adjustment component, wherein the glaze slurry level control component and the flow rate adjustment component are respectively signal-connected to the glazing device.

[0014] In one embodiment of the present invention, the glazing device is a bell-shaped glazing device or a flat-slit duckbill glazing device.

[0015] As described above, the glaze water barrier agent, preparation method, isolation method, and production system for wall and floor glazed tiles of the present invention have the following beneficial effects: 1. Completely solves the problem of glaze sticking to the end face: The hydrophobic layer formed by the release agent can completely block the contact between the glaze and the end face of the brick blank, avoiding edge glaze sticking and edge adhesion from the source, eliminating the glassy hard nail defect of the kiln rollers, and extending the service life of the rollers.

[0016] 2. Significant cost reduction and efficiency improvement: No need to add glaze washing and scraping equipment, reducing equipment investment and maintenance costs; at the same time, it avoids body breakage and increases the yield by 2-5%; it has good adaptability to high-speed glazing lines (≥15m / min) and increases single-line capacity.

[0017] 3. Adaptable to multiple product categories: The isolation layer thickness is controllable and the film formation is uniform, which can be adapted to multiple product categories such as small-sized wall and floor tiles, large-sized slabs, and thin slabs, solving the industry pain point of not being able to handle the glaze adhesion on the end face of large-sized products.

[0018] 4. Environmentally friendly and residue-free: The high-temperature decomposition temperature of the barrier agent is ≥850℃, and the residue rate after firing is ≤0.5%, which does not affect the quality of the glaze and the physical and chemical properties of the brick body, and meets the requirements of environmentally friendly production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A flowchart illustrating the preparation method of the glaze water barrier agent for wall and floor glazed tiles provided by the present invention; Figure 2 A process flow diagram of the preparation method of the glaze water barrier agent for wall and floor glazed tiles provided by the present invention; Figure 3 A flowchart illustrating the isolation method of the glaze water barrier agent for wall and floor glazed tiles provided by the present invention. Detailed Implementation

[0021] This invention provides a glaze water barrier agent for wall and floor glazed tiles, a preparation method, an isolation method, and a production system. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the description of this invention, it should be understood that the terms "up," "down," "left," and "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the terms "installation," "connection," etc., should be interpreted broadly; those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. Example

[0022] This invention provides a water barrier agent for glaze on wall and floor tiles, comprising the following raw materials in parts by weight: 25-40 parts of hydrophobic modified inorganic powder, 15-25 parts of water-based film-forming resin, 5-12 parts of flux, 2-5 parts of dispersant, 1-3 parts of thickener, and 20-35 parts of deionized water.

[0023] In detail, the hydrophobically modified inorganic powder is a hydrophobically treated kaolin / calcined alumina composite powder, wherein the mass ratio of kaolin to calcined alumina is 2:1; the hydrophobic treatment agent is a silane coupling agent; the waterborne film-forming resin is an acrylate resin / polyurethane resin composite system with a solid content of 30-40%; the flux is a zinc borate / barium carbonate composite system with a mass ratio of 1:1-2:1; the dispersant is a polycarboxylate dispersant; and the thickener is a hydroxyethyl cellulose / bentonite composite system. The glaze water barrier agent has a viscosity of 800-1500 mPa·s (25℃), a surface tension ≤25 mN / m, a high-temperature decomposition temperature ≥850℃, and an inorganic residue rate ≤0.5% after firing.

[0024] Specifically, the hydrophobically modified inorganic powder is selected from 30 parts of a hydrophobically modified kaolin or calcined alumina composite powder; wherein, as a raw material in the intermediate preparation process, the amount of silane coupling agent is 3%. The aqueous film-forming resin is selected from 20 parts of an acrylate or polyurethane composite film-forming resin (solid content 35%). The co-solvent is selected from 8 parts of a mixture of zinc borate and barium carbonate, wherein the mass ratio of zinc borate to barium carbonate is 1:1. The dispersant is selected from 3 parts of a polycarboxylate dispersant. The thickener is selected from 2 parts of a hydroxyethyl cellulose or bentonite thickener. 27 parts of deionized water are also included. Example

[0025] The difference between this embodiment and the previous embodiment is that the special barrier agent was prepared using 25 parts of hydrophobically modified kaolin / calcined alumina composite powder (treated with silane coupling agent, 3% dosage), 18 parts of acrylate and polyurethane composite film-forming resin (solid content 32%), 6 parts of zinc borate and barium carbonate flux (mass ratio 1:1), 2 parts of polycarboxylate dispersant, 1.5 parts of hydroxyethyl cellulose or bentonite thickener, and 37.5 parts of deionized water. The preparation steps were the same as in Example 1, resulting in a barrier agent with a viscosity of 850 mPa·s (25℃) and a surface tension of 24 mN / m. Example

[0026] Please see Figure 1 and Figure 2 The present invention provides a method for preparing the above-mentioned wall and floor glazed tile glaze water barrier agent, including the following steps: (1) Preparation of hydrophobic modified inorganic powder: Kaolin and calcined alumina are mixed at a mass ratio of 2:1, and silane coupling agent is added as a hydrophobic treatment agent. The amount of silane coupling agent is 3-5% of the mass of inorganic powder. After stirring evenly, the powder is dried, ground, and passed through a 200-mesh sieve to obtain hydrophobic modified inorganic powder; (2) Base material preparation: Dispersant and thickener are added to deionized water in sequence and stirred until completely dissolved to obtain water-based base material; (3) Barrier agent preparation: Hydrophobic modified inorganic powder, water-based film-forming resin, and flux are added to the water-based base material and stirred at high speed for 30-60 min at a speed of 1500-2500 r / min to obtain a uniform suspension as glaze water barrier agent.

[0027] In this embodiment, the specific preparation method is as follows: Kaolin and calcined alumina are mixed at a ratio of 2:1, silane coupling agent ethanol solution is added, stirred for 30 min, dried at 105℃ for 2 h, and ground through a 200-mesh sieve; dispersant and thickener are added to deionized water and stirred to dissolve; hydrophobic modified powder, film-forming resin and flux are added, and stirred at 2000 r / min for 45 min to obtain a barrier agent with a viscosity of 1000 mPa・s (25℃) and a surface tension of 23 mN / m. Example

[0028] Please see Figure 3 This invention provides an isolation method for using the above-mentioned glaze barrier agent for wall and floor glazed tiles, comprising the following steps: S1. Tile blank pretreatment: Before the tile blank is transported to the glazing station, the leading edge end face and the trailing edge end face of the tile blank in the forward direction are identified by a positioning device to confirm the isolation coating area; S2. Barrier agent coating: The glaze barrier agent is uniformly coated on the leading edge end face and the trailing edge end face of the tile blank by means of fixed-point spraying or screen printing to form a hydrophobic isolation layer with a thickness of 0.02-0.08mm; S3. Pre-drying treatment: Using the residual heat of the brick blank after it leaves the drying kiln or an external drying device, the temperature of the brick blank is controlled above 60℃ and dried until the moisture content of the isolation layer is ≤1%, so as to avoid the glaze slurry diluting the isolation layer during glazing; S4. Glazing and forming: The pre-dried brick blank is sent to the bell jar glazing or flat seam duckbill glazing station. The glaze slurry flows down the surface of the brick blank, and the isolation layer prevents the glaze slurry from adhering to the front end face and the rear end face; S5. Firing treatment: The glazed brick blank is fired in the kiln, and the isolation layer volatilizes at high temperature.

[0029] Preferably, in step S4, the glazing parameters are controlled as follows: glaze level height 150-250mm, glaze specific gravity 1.35-1.85g / cm³, glazing speed 5-20m / min, and glaze curtain thickness 5-8mm. In step S2, when screen printing is used, the screen mesh count is 120-180 mesh, and the printing speed is 2-5m / min; when point spraying is used, the spraying pressure is 0.2-0.4MPa, and the distance between the nozzle and the end face of the brick is 10-20cm.

[0030] Preferred isolation methods are as follows: ① Brick pretreatment: After pressing, the temperature of the dried brick is maintained above 60℃, and it is preheated and dried to maintain a high brick temperature. ② Barrier agent coating: The moisture content of the isolation layer is 6%; before the 600×1200mm brick is conveyed to the glazing station after the base glaze, the photoelectric sensor identifies the end face of the brick and locates the coating area; a fixed-point spraying method is adopted, with a spraying pressure of 0.3MPa and a spraying distance of 200mm, and the edge face of the brick is evenly coated, with an isolation layer thickness of 0.05mm; ③ Brick temperature pre-drying treatment: Preheat and dry at 60℃, and the moisture content of the isolation layer is reduced to 1%; ④ Glazing and forming: The brick is sent to the bell jar glazing station, with the glaze level at 200mm, the glaze specific gravity at 1.65g / cm³, the glazing speed at 2.0m / min, and the glaze curtain thickness at 6mm; ⑤ Firing treatment: Firing is carried out according to the conventional curve at 1200℃×40min to obtain the finished wall and floor tiles. Example

[0031] The difference between this embodiment and the above embodiment is as follows: the isolation method is as follows: ① Brick blank pretreatment: after pressing, the temperature of the dried brick blank is kept above 60℃, preheated and dried to maintain a high blank temperature. ② Barrier agent coating: before the 300×600mm wall tile blank after the base glaze is conveyed to the glazing station, the photoelectric sensor positions the edge face of the brick; a fixed-point spraying method is adopted, the spraying pressure is 0.25MPa, the spraying distance is 180mm, the end face is evenly coated, and the isolation layer thickness is 0.03mm; ③ Pre-drying treatment: preheated and dried at 45℃, the moisture content of the isolation layer is 0.5%; ④ Glazing and forming: sent into the bell jar glazing station, the glaze slurry level is 180mm, the glaze slurry specific gravity is 1.75g / cm³, the glazing speed is 1.8m / min, and the glaze curtain thickness is 5mm; ⑤ Firing treatment: fired according to the conventional curve at 1190℃×35min to obtain the finished wall tile. Example

[0032] This invention provides an isolation system applying the aforementioned glaze isolation method for glazed wall and floor tiles. The system includes a blank conveyor line, an end-face positioning and coating device, a pre-drying treatment zone, a glazing device, and a firing kiln, arranged sequentially along the tile blank processing direction. Each workstation is synchronized and interacts with data via a PLC central control system. The blank conveyor line is preferably a roller conveyor or mesh belt conveyor with anti-deviation function, responsible for sequentially conveying the tile blanks to each processing station, providing a stable physical reference for subsequent precise positioning.

[0033] The end-face positioning and coating device, as the core component for achieving end-face isolation, specifically includes a photoelectric sensor, a spraying / screen printing assembly, and a controller. The photoelectric sensor is electrically connected to the controller, and its installation position corresponds to the brick's travel path. As the brick passes along the conveyor line, the photoelectric sensor is used to identify the spatial coordinates of the front and rear ends and side edges of the brick in real time and non-contactly, effectively overcoming positioning deviations caused by the brick's own dimensional tolerances or minor vibrations during transport.

[0034] The controller receives position pulse signals from the photoelectric sensor, performs delay compensation calculations using an internal algorithm, and then sends action commands to the spraying / screen printing assembly. When using the spraying assembly, the controller precisely controls the opening and closing time of the solenoid valve and the spray angle of the nozzle to achieve narrow-width quantitative spraying of the release agent on the end face. When using the screen printing assembly, the controller drives a servo motor to achieve dynamic synchronous printing between the screen and the brick blank end face, ensuring controllable release agent coating width and preventing agent splashing and waste.

[0035] The pre-drying treatment zone is located between the end-face positioning coating device and the glazing device, and is equipped with a hot air circulation drying module or an infrared heating module. After the brick blanks that have undergone end-face coating enter this zone, the moisture or solvent in the release agent evaporates rapidly in a short time, causing the release agent to quickly solidify into a film on the end face of the brick blanks.

[0036] The glazing device includes a glazing applicator, a glaze level control component, and a flow rate adjustment component. The glaze level control component and the flow rate adjustment component are respectively connected to the glazing applicator and the main control system. During the glazing process, the level control component monitors the glaze level in the glaze tank of the applicator in real time and maintains a constant level through a linked glaze supply pump, thereby ensuring a constant static pressure head when the glaze falls. The flow rate adjustment component dynamically adjusts the outflow cross-sectional area and flow rate of the glaze according to the conveying line speed of the brick body, ensuring that the weight of glaze applied to the front of the brick body per unit time (i.e., the amount of glaze applied) remains highly uniform, avoiding edge overflow due to fluctuations in glaze curtain thickness.

[0037] Optionally, the glazing device can be a bell-shaped glazing device or a flat-slit duckbill glazing device. When a bell-shaped glazing device is used, the glaze flows evenly down the curved surface of the bell to form an arc-shaped glaze curtain, which has a wide coverage area and is particularly suitable for rapid glazing of the central area of ​​large-format wall and floor tiles, resulting in excellent glaze surface flatness. When a flat-slit duckbill glazing device is used, a straight glaze curtain with uniform thickness and sharp edges can be formed through its flat slit at the bottom. This structure can better control the fluid dynamics of the glaze at the edge of the tile blank. Combined with the end-face isolation layer of the previous station, it can minimize the surface tension climbing effect when the glaze reaches the edge of the tile blank, thereby achieving the ultimate isolation effect of "zero glaze dripping" at the end face.

[0038] In summary, the glaze barrier agent, preparation method, isolation method, and production system for wall and floor glazed tiles of the present invention, through the synergistic compounding of hydrophobically modified inorganic powder and water-based film-forming resin, endow the barrier agent with extremely low surface tension and suitable viscosity, enabling it to precisely adhere to the end face of the tile blank to form a dense hydrophobic isolation layer. This isolation layer can completely block the adhesion and penetration of glaze slurry on the front and rear edges of the tile blank during the glazing process, effectively solving defects such as glaze dripping and overflow that are prone to occur in traditional production. Combined with the precise end-face positioning coating system and pre-drying process, it not only avoids the barrier agent shifting and contaminating the tile surface but also eliminates the risk of the isolation layer being diluted and ineffective by the glaze during glazing. More importantly, the compounded flux allows the barrier agent to decompose stably at high temperatures during the firing stage, with extremely low inorganic residue after firing. This completely eliminates the interference of the barrier agent on the final glaze color and smoothness, achieving a closed-loop process for ceramic tile end-face isolation from "precise coating and thorough isolation" to "high-temperature traceless volatilization," significantly improving the yield and appearance quality of wall and floor glazed tiles. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0039] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A glaze water barrier agent for wall and floor glazed tiles, characterized in that, The raw materials include the following parts by weight: 25-40 parts of hydrophobic modified inorganic powder, 15-25 parts of water-based film-forming resin, 5-12 parts of flux, 2-5 parts of dispersant, 1-3 parts of thickener, and 20-35 parts of deionized water.

2. The glaze water barrier agent for wall and floor glazed tiles according to claim 1, characterized in that, The hydrophobically modified inorganic powder is a hydrophobically treated kaolin / calcined alumina compound powder, wherein the mass ratio of kaolin to calcined alumina is 2:

1. The hydrophobicating agent is a silane coupling agent; The aqueous film-forming resin is an acrylate resin / polyurethane resin composite system with a solid content of 30-40%. The flux is a zinc borate / barium carbonate composite system with a mass ratio of 1:1-2:1; The dispersant is a polycarboxylate dispersant; The thickener is a hydroxyethyl cellulose / bentonite compound system.

3. The glaze water barrier agent for wall and floor glazed tiles according to claim 1, characterized in that, The viscosity of the glaze barrier is 800-1500 mPa·s (25℃), the surface tension is ≤25 mN / m, the high-temperature decomposition temperature is ≥850℃, and the inorganic residue rate after firing is ≤0.5%.

4. A method for preparing a water-repellent barrier agent for wall and floor glazed tiles as described in any one of claims 1-3, characterized in that, Includes the following steps: (1) Preparation of hydrophobically modified inorganic powder: Kaolin and calcined alumina are mixed at a mass ratio of 2:1, and silane coupling agent is added as a hydrophobic treatment agent. The amount of silane coupling agent is 3-5% of the mass of inorganic powder. After stirring evenly, the powder is dried, ground, and passed through a 200-mesh sieve to obtain hydrophobically modified inorganic powder. (2) Base material preparation: Add dispersant and thickener to deionized water in sequence, and stir until completely dissolved to obtain water-based base material; (3) Preparation of barrier agent: Add hydrophobic modified inorganic powder, water-based film-forming resin and flux to water-based base material, stir at high speed for 30-60 min at a speed of 1500-2500 r / min to obtain a uniform suspension as glaze water barrier agent.

5. A method for isolating wall and floor glazed tile glaze water barrier agent according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Brick blank pretreatment: Before the brick blank is conveyed to the glazing station, the front end face and rear end face of the brick blank in the direction of forward movement are identified by the positioning device to confirm the isolation coating area; S2. Barrier coating: Apply glaze barrier agent evenly to the front and rear end faces of the brick blank by spot spraying or screen printing to form a hydrophobic isolation layer with a thickness of 0.02-0.08mm. S3. Pre-drying treatment: Using the residual heat of the brick blanks after they leave the drying kiln or an external drying device, control the temperature of the brick blanks to above 60℃ and dry them until the moisture content of the isolation layer is ≤1% to avoid the glaze slurry diluting the isolation layer during glazing. S4. Glazing and molding: The pre-dried brick blank is sent into the bell jar glazing or flat seam duckbill glazing station. The glaze flows down the surface of the brick blank, and the isolation layer prevents the glaze from adhering to the front end face and the rear end face. S5. Firing treatment: The glazed brick blanks are fired in the kiln, and the isolation layer volatilizes at high temperature.

6. The isolation method of the glaze water barrier agent for wall and floor glazed tiles according to claim 5, characterized in that, In step S4, the glazing parameters are controlled as follows: glaze slurry level height 150-250mm, glaze slurry specific gravity 1.35-1.85g / cm³, glazing speed 5-20m / min, and glaze curtain thickness 5-8mm.

7. The isolation method of the glaze water barrier agent for wall and floor glazed tiles according to claim 5, characterized in that, In step S2, When using screen printing for coating, the mesh count of the screen should be 120-180 mesh, and the printing speed should be 2-5 m / min. When using spot spraying for coating, the spraying pressure should be 0.2-0.4 MPa, and the distance between the nozzle and the end face of the brick should be 10-20 cm.

8. An isolation system for using the glaze isolation method for wall and floor glazed tiles according to any one of claims 5-7, characterized in that, It includes a green body conveying line, an end face positioning and coating device, a pre-drying treatment zone, a glazing device, and a firing kiln, which are arranged in sequence. The end-face positioning coating device includes a photoelectric sensor, a spraying / screen printing assembly, and a controller. The photoelectric sensor is electrically connected to the controller and is used to accurately identify the position of the brick blank end face. The controller is used to control the actions of the spraying / screen printing assembly.

9. The glaze water isolation system for wall and floor glazed tiles according to claim 8, characterized in that, The glazing device includes a glazing device, a glaze slurry level control component, and a flow rate adjustment component. The glaze slurry level control component and the flow rate adjustment component are respectively connected to the glazing device via signal.

10. The glaze water isolation system for wall and floor glazed tiles according to claim 9, characterized in that, The glazing device is either a bell-shaped glazing device or a flat-slit duckbill glazing device.

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