A double-layer low water absorption green tile with enhanced tile bonding strength

Abstract

The application discloses a kind of double-layer low water absorption brick billets for enhancing tile bonding strength, including body layer and isolation covering billet layer, the water absorption of the body layer is <0.1%, the water absorption of the isolation covering billet layer is 0.5~1%;The isolation covering billet layer is pressed and fired by isolation covering powder, the particle gradation of the isolation covering powder is: 20 mesh screen residue ≤7%, 40 mesh screen residue 65~80%, 60 mesh screen residue 88~96% and 100 mesh screen residue ≥98%;And according to mass percentage, the chemical composition of the isolation covering powder includes SiO2 60~65%, Al2O3 19~22%, Fe2O3 0.7~1%, TiO2 0.1~0.5%, CaO 0.2~0.7%, MgO 2~2.6%, K2O 2~3%, Na2O 1~1.6% and loss on ignition 6.2~7.2%.The scheme can effectively reduce the air pocket and falling phenomenon formed in the process of paving and using by adding an isolation covering billet layer for enhancing tile paving bonding strength at the bottom of the body layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building ceramics, and particularly relates to a double-layer low water absorption brick body for enhancing the bonding strength of ceramic tiles. BACKGROUND

[0002] In traditional ceramic tile paving, the bonding performance between the cement bonding layer after paving and the ceramic tile is lower as the water absorption (E value) of the ceramic tile is lower. The main reason is that the sintering degree of the low water absorption (E < 0.1%) ceramic tile product is higher, so that the surface layer of the bottom of the ceramic tile is relatively smooth, the density is higher, and the micropores and pits are less, so that the firm embedding formed after the hydration reaction of the ceramic tile and the cement bonding layer is reduced.

[0003] In addition, the residual stress of the large-specification low water absorption ceramic tile product after high-temperature sintering is low, so that it is not easy to deform. The lower deformation amount causes the stress generated at the contact interface between the bottom of the ceramic tile and the cement bonding layer to be mostly concentrated in the relatively weak cement bonding layer. At the same time, due to the application of the large-specification ceramic tile product, the joint per unit area is less, and the joint that can supply deformation to release force is reduced. The above factors will cause the cement bonding layer to be subjected to a larger force, and thus be more easily damaged and broken, and finally form the hollowing and falling phenomenon during the ceramic tile paving and use. On the one hand, the hollowed ceramic tile is prone to warping or falling in use, affecting the decorative effect; on the other hand, when the hollowing phenomenon occurs in the water area such as balcony, kitchen and bathroom, water accumulation is easy to occur at the hollowing position to produce foul odor, which seriously affects the human living experience.

[0004] The insufficient bonding strength between the ceramic tile and the cement mortar-based bonding agent is one of the reasons for the hollowing. In order to increase the strength of the ceramic tile and the bonding agent, ceramic tile glue is often used, but the cost is several times that of ordinary cement mortar, and the construction cost is high. In addition, through the study on the bonding strength of the ceramic tile and the bonding agent, it is found that the water absorption of the ceramic tile body is a very important factor affecting the bonding strength. Improving the water absorption of the ceramic tile body can effectively reduce the risk of ceramic tile hollowing, so in order to ensure that the ceramic tile does not slip during paving and does not fall after paving, some manufacturers also improve the bonding strength of the ceramic tile by improving the water absorption of the ceramic tile body. However, the improvement of the water absorption of the ceramic tile body means the decrease of the mechanical performance indexes such as the breaking strength and the modulus of rupture of the ceramic tile product, which easily leads to the limitation of the application scene and consumer group of the ceramic tile product. Therefore, how to improve the paving bonding strength of the low water absorption ceramic tile has become a difficult problem in the building ceramic industry.

[0005] Further, the semi-finished product (i.e. the un-edged product just out of the furnace) of the ceramic tile body after high-temperature firing has the color and whiteness of the edge part substantially consistent with that of the bottom part; while the finished product after edging has the color of the edge part lighter and the whiteness higher, which is quite different from that of the bottom part. This is mainly because the edge part and the bottom part of the semi-finished product are directly heated in the firing process, so that the sintering degree is substantially consistent, and the color and whiteness of the body are substantially close; while the semi-finished product is edged (the edging amount is about 15 mm), the edge part position after edging receives relatively less heat in the firing process, resulting in the sintering degree of the position lower than that of the bottom part, thus the whiteness of the edge part after edging is higher than that of the bottom part, which causes the insufficient overall appearance of the ceramic tile product, and the overall appearance will be reflected in the use performance and function of the ceramic tile product to some extent, resulting in the difference in the use performance and function of the same ceramic tile product, which is not conducive to meeting the use requirements of customers. SUMMARY

[0006] The purpose of the present application is to provide a double-layer low water absorption tile body with enhanced bonding strength of ceramic tiles, which can effectively reduce the hollowing and falling phenomena of the existing low water absorption ceramic tiles in the process of paving and using by adding an isolation and covering body layer at the bottom of the body layer to overcome the shortcomings in the prior art; meanwhile, the isolation and covering body layer also has excellent covering power and whiteness.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] A double-layer low water absorption tile body with enhanced bonding strength of ceramic tiles, comprising a body layer and an isolation and covering body layer, the isolation and covering body layer is located at the bottom of the body layer, and the water absorption of the body layer is <0.1%, and the water absorption of the isolation and covering body layer is 0.5-1%;

[0009] The isolation and covering body layer is pressed and fired from isolation and covering powder, and the particle size distribution of the isolation and covering powder is: 20 mesh screen residue ≤7%, 40 mesh screen residue 65-80%, 60 mesh screen residue 88-96%, and 100 mesh screen residue ≥98%;

[0010] And the chemical composition of the isolation and covering powder comprises, in terms of mass percentage, SiO2 60-65%, Al2O3 19-22%, Fe2O3 0.7-1%, TiO2 0.1-0.5%, CaO 0.2-0.7%, MgO 2-2.6%, K2O 2-3%, Na2O 1-1.6%, and loss on ignition 6.2-7.2%.

[0011] Preferably, the water content of the isolation and covering powder is 7.2-8.0% in terms of mass percentage.

[0012] Preferably, the green body layer is pressed and fired from green body powder having a particle size distribution of: 20 mesh sieve residue ≤ 2%, 40 mesh sieve residue 55-65%, 60 mesh sieve residue 85-95%, and 100 mesh sieve residue ≥ 97%.

[0013] Preferably, the chemical composition of the covering powder includes, in mass percentage, SiO2 62.63%, Al2O3 20.28%, Fe2O3 0.87%, TiO2 0.29%, CaO 0.42%, MgO 2.26%, K2O 2.64%, Na2O 1.33%, and loss on ignition 6.75%.

[0014] Preferably, the raw materials of the covering powder include, in mass fraction, sodium sand 8 parts, bauxite 10 parts, talc 5.5 parts, potassium-sodium sand 18 parts, washed mud 24 parts, mixed mud 10 parts, and yellow sand 24.5 parts.

[0015] The talc has a MgO content of 35-40% and a loss on ignition of 25-30% in mass percentage, the washed mud has an Al2O3 content of 30-35% and a loss on ignition of 10-13% in mass percentage, and the bauxite has an Al2O3 content of 45-50% and a loss on ignition of 10-13% in mass percentage.

[0016] Preferably, the covering powder has a feeding amount of 800-1000 g / m2. 2 .

[0017] Preferably, the green body layer has a whiteness of at least 20 degrees.

[0018] Preferably, the chemical composition of the sodium sand includes, in mass percentage, SiO2 70.09%, Al2O3 16.46%, Fe2O3 0.19%, TiO2 0.09%, CaO 0.54%, MgO 0.11%, K2O 0.66%, Na2O 8.01%, and loss on ignition 0.64%.

[0019] The chemical composition of the potassium-sodium sand includes, in mass percentage, SiO2 75.82%, Al2O3 11.63%, Fe2O3 0.32%, TiO2 0.05%, CaO 0.5%, MgO 0.12%, K2O 5.44%, Na2O 2.59%, and loss on ignition 0.61%.

[0020] Preferably, the chemical composition of the washed mud includes SiO2 50.27%, Al2O3 32.5%, Fe2O3 1.41%, TiO2 0.18%, CaO 0.12%, MgO 0.25%, K2O 3.16%, Na2O 0.37% and loss on ignition 10.98% by mass percentage;

[0021] The chemical composition of the mixed mud includes SiO2 68.7%, Al2O3 19.07%, Fe2O3 1.15%, TiO2 0.39%, CaO 0.4%, MgO 0.24%, K2O 1.09%, Na2O 0.2% and loss on ignition 6.91% by mass percentage.

[0022] Preferably, the chemical composition of the yellow sand includes SiO2 75.7%, Al2O3 10.24%, Fe2O3 0.93%, TiO2 0.22%, CaO 0.33%, MgO 0.23%, K2O 1.89%, Na2O 0.32% and loss on ignition 2.63% by mass percentage.

[0023] The technical scheme provided by the embodiment of the application can include the following beneficial effects:

[0024] 1. The particle size distribution of the isolation and covering powder for sintering the isolation and covering green layer is limited, which has a large particle size, is beneficial to increase the roughness of the sintered isolation and covering green layer, can improve the bonding force between the isolation and covering green layer and the conventional low water absorption green body layer, and can effectively enhance the bonding strength during paving.

[0025] 2. The formula structure of the isolation and covering green layer is optimized, the water absorption, sintering degree and porosity of the isolation and covering green layer are controlled in a suitable range, the particle size distribution of the powder is limited, the purpose of enhancing the bonding strength during paving and use is achieved, the hiding power and whiteness of the isolation and covering green layer are improved, the through-body property of the green brick is improved, the use performance and function of the green brick are ensured to a certain extent, and the use demand of the customer is met. DETAILED DESCRIPTION

[0026] A double-layer low water absorption green brick for enhancing the bonding strength of ceramic tiles, comprising a green body layer and an isolation and covering green layer, the isolation and covering green layer is located at the bottom of the green body layer, the water absorption of the green body layer is <0.1%, and the water absorption of the isolation and covering green layer is 0.5-1%.

[0027] The isolation and covering green layer is pressed and sintered by isolation and covering powder, and the particle size distribution of the isolation and covering powder is as follows: the residue on a 20-mesh screen is ≤7%, the residue on a 40-mesh screen is 65-80%, the residue on a 60-mesh screen is 88-96%, and the residue on a 100-mesh screen is ≥98%.

[0028] and the chemical composition of the isolation covering powder, in terms of mass percentage, comprises SiO260-65%, Al2O319-22%, Fe2O30.7-1%, TiO20.1-0.5%, CaO 0.2-0.7%, MgO 2-2.6%, K2O 2-3%, Na2O 1-1.6%, and a loss on ignition of 6.2-7.2%.

[0029] In order to effectively reduce the hollowing and falling phenomenon of the existing low water absorption ceramic tiles in the process of paving and using, the present application provides a double-layer low water absorption tile body with enhanced bonding strength, by adding an isolation covering body layer at the bottom of the body layer, optimizing the formula and structure of the isolation covering body layer, controlling the water absorption, sintering degree and porosity of the isolation covering body layer in a suitable range, and limiting the particle size distribution of the powder of the isolation covering body layer, so as to enhance the bonding strength in the process of paving and using, improve the covering power and whiteness of the isolation covering body layer, improve the overall performance of the tile body, ensure the consistency of the performance and function of the tile body to a certain extent, and meet the use requirements of customers.

[0030] Specifically, in order to enhance the bonding strength of the tile body, the double-layer low water absorption tile body of the present application first limits the particle size distribution of the isolation covering powder used for sintering the isolation covering body layer, which has a large particle size, which is beneficial to increase the roughness of the isolation covering body layer after sintering, which can on the one hand improve the bonding force between the isolation covering body layer and the conventional low water absorption body layer, and on the other hand effectively enhance the bonding strength during paving.

[0031] Then, in order to further improve the bonding strength and covering power of the body layer, the formula system of the isolation covering powder is designed as a high fluxing (calcium, magnesium, potassium and sodium) and high loss on ignition system.

[0032] Firstly, after high-temperature sintering, the formula system forms a magnesium solid solution system with magnesium aluminate spinel (MgO·Al2O3) as the main product and with a refractive index of 1.72, magnesium olivine (2MgO·SiO2) with a refractive index of 1.63 and cordierite (2MgO·2Al2O3·5SiO2) with a refractive index of 1.56 as auxiliary products, which can effectively improve the covering effect of the isolation covering body layer by generating scattering substances with a large refractive index in the body layer.

[0033] In addition, in the high-temperature firing process of the isolation covering powder, part of the powder participates in the reaction and melts into a glass phase, and at a certain temperature, crystals with high refractive index are generated, while the other part of the powder cannot fully react (especially some raw materials in the powder with a higher melting temperature) and remains in the solid solution; by controlling the particle size distribution of the isolation covering powder, the Mie scattering phenomenon that maximizes the scattering effect of the isolation covering layer can be further improved to achieve the purpose of improving the covering effect.

[0034] Secondly, in general, the sintering degree of the post-firing layer increases with the increase of the alumina content in the formula system, and decreases with the increase of the flux content in the formula system. In the high-flux formula system of the present solution, it is helpful for the post-firing isolation covering layer to have a suitable sintering degree, which can on the one hand be well bonded with the conventional low-water absorption body layer before and after firing, and on the other hand play a role in isolating the stick from the body layer during firing. If the sintering degree of the isolation covering layer is too high, it is difficult to form a dense brick structure with the body layer; if the sintering degree of the isolation covering layer is too low, it is not conducive to the isolation of the stick and the ceramic tile.

[0035] It should be noted that in the production process of modern ceramic tiles, magnesium oxide is generally used as the brick bottom paste, which can easily produce magnesium hydroxide through hydration reaction. This substance can easily form magnesium sulfate crystals with sulfides in the flue gas in the kiln, and can easily form co-melting substances such as magnesium aluminate spinel with alumina on the surface of the brick bottom and the stick in the high-temperature zone. The above co-melting substances are the "stick nails" attached to the stick and the brick bottom surface.

[0036] The appearance of stick nails mainly concentrates in the temperature range between the pre-heating section (350-800℃) of the kiln and the high-temperature section and the rapid cooling section. In the former, the brick is running in the pre-heating section of the kiln, and since the firing temperature of the pre-heating section is relatively low, the brick has not yet appeared liquid phase at this time and thus has low strength. If it is affected by the stick nails at this time, it is easy to cause the brick to run unevenly and be damaged; in the latter, the brick is softened after passing through the high-temperature zone of the kiln, and if there are stick nails on the stick at this time, it will affect the flatness of the brick and cause local deformation, thereby affecting the deformation degree of the product. Therefore, how to avoid the appearance of stick nails has also become a problem in the ceramic industry.

[0037] In the prior art, the amount or proportion of brick bottom paste is generally reduced as much as possible. However, if the effective components of the brick bottom paste are reduced, it is difficult to play a role in isolation between the stick and the brick blank. In addition, because the conventional proportion of the brick bottom paste is large and difficult to sinter, after the ceramic tile product is fired, the bottom of the product is left with residues that are unevenly distributed and have low adhesion with the ceramic tile. When the ceramic tile is laid, the residues further reduce the adhesion strength between the ceramic tile and the cement adhesive layer, increasing the risk of the ceramic tile falling off. Therefore, in the actual laying process, the decoration construction unit generally lays the ceramic tile after manually cleaning the brick bottom paste residues, which is time-consuming and labor-intensive and is not conducive to improving the laying efficiency.

[0038] The present scheme optimizes the formula structure of the isolation covering blank layer and makes it have a suitable sintering degree. In addition to being able to enhance the adhesion strength of the brick blank during laying, it also plays a certain isolation role. Therefore, in the production process of the low water absorption brick blank of the present scheme, the addition of the isolation covering blank layer can also partially or even completely replace the existing brick bottom paste to avoid the appearance of the stick during the firing process, thereby further enhancing the adhesion strength of the brick blank and improving the laying efficiency of the brick blank.

[0039] Thirdly, because the formula of the isolation covering powder of the present scheme has a high loss on ignition, the blank layer can form a large number of small pores in the incomplete vitrification reaction, that is, the water absorption is controlled at 0.5-1%. Because the water absorption of the isolation covering blank layer is relatively high compared with the blank body layer, the liquid phase generated in the isolation covering blank layer is less and is not enough to completely fill the pores generated by the high loss on ignition, ultimately leaving part of the pores in the isolation covering blank layer. This not only helps the isolation covering blank layer to play a high-temperature isolation role, but also improves its adhesion to the cement adhesive layer during laying, achieving the purpose of enhancing the adhesion strength. In addition, limiting the water absorption of the isolation covering blank layer through the optimization of the formula structure also helps to ensure the stability of the blank layer brick type and reduce the risk of secondary deformation due to moisture absorption later.

[0040] Further, the water content of the isolation covering powder is 7.2-8.0% by mass percentage.

[0041] In a preferred embodiment of the present technical scheme, the water content of the isolation covering powder is further controlled to be 7.2-8.0%. If the water content of the powder is too low, it is easy to cause the particle size of the powder to be too small, making it difficult to form a rough surface of coarse particles in the blank layer. In addition, too low water content will also easily lead to a small porosity after drying and sintering, which is not enough to form small gaps in the blank layer, limiting the improvement of the adhesion strength of the brick blank. If the water content of the powder is too high, it will easily reduce the flowability of the powder, affecting the uniformity of the powder layer during the distribution process, and easily increasing the risk of the blank body layer being exposed.

[0042] Further, the green body layer is pressed and sintered from the green body powder, and the particle size distribution of the green body powder is: 20 mesh sieve residue ≤2%, 40 mesh sieve residue 55-65%, 60 mesh sieve residue 85-95%, and 100 mesh sieve residue ≥97%.

[0043] In addition, in order to further improve the combination of the isolation covering green layer and the green body layer, the green body powder with smaller particle size and the isolation covering powder with larger particle size are preferably used together.

[0044] Further, the chemical composition of the isolation covering powder includes SiO2 62.63%, Al2O3 20.28%, Fe2O3 0.87%, TiO2 0.29%, CaO 0.42%, MgO 2.26%, K2O 2.64%, Na2O 1.33%, and loss on ignition 6.75% according to the mass percentage.

[0045] The present application also provides a preferred formula of the chemical composition of the isolation covering powder, which is more conducive to the generation and transformation of target crystals in the green layer, and the isolation covering green layer with ideal sintering degree and porosity is obtained.

[0046] Further, the raw materials of the isolation covering powder include sodium sand 8 parts, bauxite 10 parts, talc 5.5 parts, potassium sodium sand 18 parts, washed mud 24 parts, mixed mud 10 parts, and yellow sand 24.5 parts according to the mass fraction.

[0047] The MgO content of the talc is 35-40% and the loss on ignition is 25-30% according to the mass percentage, the Al2O3 content of the washed mud is 30-35% and the loss on ignition is 10-13%, and the Al2O3 content of the bauxite is 45-50% and the loss on ignition is 10-13%.

[0048] Further, the present application also provides a raw material scheme for configuring the preferred formula of the chemical composition of the isolation covering powder.

[0049] Specifically, the talc with extremely high MgO content and loss on ignition is selected as the raw material of the isolation covering powder, which is conducive to providing sufficient MgO and loss on ignition, and plays an important role in forming magnesium-based high refractive index products and the porosity after sintering. At the same time, a large amount of washed mud and bauxite are introduced, and both the washed mud and the bauxite contain extremely high Al2O3 content and loss on ignition, which is conducive to providing sufficient Al2O3 and loss on ignition for the formula system, and plays an important role in forming high refractive index crystals and small concave pores required for improving the paving performance.

[0050] Further, the amount of the isolation covering powder is 800-1000 g / m2.2 .

[0051] Since the isolation covering base layer in the case has high covering power through optimization of the formula structure, the amount of isolation covering powder can be reduced under the premise of ensuring the covering effect of the base layer, so as to be suitable for ceramic products of different thickness ranges, such as ceramic rock plates with thinner thickness, and to avoid weakening the breaking strength and fracture modulus of the double-layer low water absorption brick base by too much proportion of the isolation covering base layer.

[0052] Further, the whiteness of the isolation covering base layer is at least 20 degrees.

[0053] After high-temperature firing, the whiteness of the isolation covering base layer in the present application is at least 20 degrees, which to some extent whitens the bottom of the base body layer and improves the overall effect of the low water absorption brick base.

[0054] Further, the chemical composition of the sodium sand includes SiO2 70.09%, Al2O3 16.46%, Fe2O3 0.19%, TiO2 0.09%, CaO 0.54%, MgO 0.11%, K2O 0.66%, Na2O 8.01%, and loss on ignition 0.64% by mass percentage.

[0055] The chemical composition of the potassium sodium sand includes SiO2 75.82%, Al2O3 11.63%, Fe2O3 0.32%, TiO2 0.05%, CaO 0.5%, MgO 0.12%, K2O 5.44%, Na2O 2.59%, and loss on ignition 0.61% by mass percentage.

[0056] Further, the chemical composition of the washed mud includes SiO2 50.27%, Al2O3 32.5%, Fe2O3 1.41%, TiO2 0.18%, CaO 0.12%, MgO 0.25%, K2O 3.16%, Na2O 0.37%, and loss on ignition 10.98% by mass percentage.

[0057] The chemical composition of the mixed mud includes SiO2 68.7%, Al2O3 19.07%, Fe2O3 1.15%, TiO2 0.39%, CaO 0.4%, MgO 0.24%, K2O 1.09%, Na2O 0.2%, and loss on ignition 6.91% by mass percentage.

[0058] Further, the chemical composition of the yellow sand includes, in percentage by mass, SiO2 75.7%, Al2O3 10.24%, Fe2O3 0.93%, TiO2 0.22%, CaO 0.33%, MgO 0.23%, K2O 1.89%, Na2O 0.32%, and loss on ignition 2.63%.

[0059] The technical solutions of the present application are further illustrated below through specific embodiments.

[0060] Embodiment 1

[0061] A double-layer low water absorption green tile for enhancing the bonding strength of ceramic tiles includes a body layer and a separating and covering green layer, the separating and covering green layer is located at the bottom of the body layer, and the chemical composition of the body layer includes, in percentage by mass, SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and loss on ignition 4.3%; the body layer is pressed and fired by using body powder, and the particle size distribution of the body powder is: 20 mesh screen residue ≤2%, 40 mesh screen residue 55-65%, 60 mesh screen residue 85-95%, and 100 mesh screen residue ≥97%.

[0062] The separating and covering green layer is pressed and fired by using separating and covering powder, and the distribution amount of the separating and covering powder is 800g / m 2 , and the particle size distribution is: 20 mesh screen residue ≤7%, 40 mesh screen residue 65-80%, 60 mesh screen residue 88-96%, and 100 mesh screen residue ≥98%; the chemical composition of the separating and covering powder includes, in percentage by mass, SiO2 60.05%, Al2O3 21.86%, Fe2O3 0.95%, TiO2 0.12%, CaO 0.26%, MgO 2.59%, K2O 2.98%, Na2O 1.14%, and loss on ignition 6.23%, and the water content of the powder is 7.2%.

[0063] Embodiment 2

[0064] A double-layer low water absorption brick body with enhanced tile bonding strength comprises a body layer and a separation cover layer, the separation cover layer is located at the bottom of the body layer, and the chemical composition of the body layer comprises SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05% and loss on ignition 4.3% in percentage by mass; the body layer is pressed and fired by body powder, and the particle size distribution of the body powder is: 20 mesh screen residue ≤2%, 40 mesh screen residue 55-65%, 60 mesh screen residue 85-95%, and 100 mesh screen residue ≥97%.

[0065] The separation cover layer is pressed and fired by separation cover powder, and the laying amount of the separation cover powder is 900g / m 2 , the particle size distribution is: 20 mesh screen residue ≤7%, 40 mesh screen residue 65-80%, 60 mesh screen residue 88-96%, and 100 mesh screen residue ≥98%; the chemical composition of the separation cover powder comprises SiO2 62.63%, Al2O3 20.28%, Fe2O3 0.87%, TiO2 0.29%, CaO 0.42%, MgO 2.26%, K2O 2.64%, Na2O 1.33% and loss on ignition 6.75% in percentage by mass, and the water content of the powder is 7.6%.

[0066] Example 3

[0067] A double-layer low water absorption brick body with enhanced tile bonding strength comprises a body layer and a separation cover layer, the separation cover layer is located at the bottom of the body layer, and the chemical composition of the body layer comprises SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05% and loss on ignition 4.3% in percentage by mass; the body layer is pressed and fired by body powder, and the particle size distribution of the body powder is: 20 mesh screen residue ≤2%, 40 mesh screen residue 55-65%, 60 mesh screen residue 85-95%, and 100 mesh screen residue ≥97%.

[0068] The separation cover layer is pressed and fired by separation cover powder, and the laying amount of the separation cover powder is 1000g / m 2The particle size distribution is as follows: 20 mesh sieve residue ≤ 7%, 40 mesh sieve residue 65-80%, 60 mesh sieve residue 88-96%, and 100 mesh sieve residue ≥ 98%; the chemical composition of the isolating covering powder includes SiO2 64.85%, Al2O3 19.03%, Fe2O3 0.74%, TiO2 0.47%, CaO 0.65%, MgO 2.03%, K2O 2.12%, Na2O 1.57%, and loss on ignition 7.15%, and the water content of the powder is 8.0%.

[0069] Comparative Example

[0070] A low water absorption tile includes a body layer prepared from conventional body raw materials in the ceramic field, and the chemical composition of the body layer includes SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and loss on ignition 4.3% by mass percentage.

[0071] The isolating covering body layer of the double-layer low water absorption tile prepared in Examples 1-3 and the low water absorption tile in the comparative example are subjected to water absorption test and whiteness test according to conventional building ceramic technology, and the double-layer low water absorption tile prepared in Examples 1-3 and the low water absorption tile in the comparative example are subjected to bonding strength, breaking strength, and modulus of rupture test, and the results are shown in Table 1 below.

[0072] Table 1 Test results of tile properties of Examples 1-3 and the comparative example

[0073]

[0074]

[0075] The bonding strength test: the prepared low water absorption tile is cut into a test block with a size of 75 mm x 75 mm for standby, mortar is prepared according to the standard sand: 325 cement: water = 3:2:1, the mortar is applied to the bottom of the test block, and the 28-day pull strength is tested.

[0076] From the performance test results of Table 1, it can be seen that the isolation cover base layer obtained from the formula structure of the present application has a water absorption rate of 0.5-1%, and the whiteness of the glaze itself after firing is at least 30 degrees. After applying it to the bottom of the base layer, the whiteness of the ground base layer is close to that of the base layer, ensuring the overall effect of low water absorption rate ceramic tiles. At the same time, the paving effect of the double-layer low water absorption rate tile body with the isolation cover base layer of the present application is tested, and the 28-day pull strength is as high as 1.131 MPa, with excellent bonding performance. In addition, the double-layer low water absorption rate tile body prepared by Examples 1-3 has very low failure strength and fracture modulus decay, and the strength values are much higher than the national standard GB / T 4100-2015. When considering paving performance and high-temperature isolation, the strength requirements of the product are met.

[0077] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only to explain the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations here, those skilled in the art can think of other specific embodiments of the present application without creative labor, and these embodiments will fall within the scope of protection of the present application.

Claims

1. A double-layered low water absorption green tile for enhancing the bonding strength of a ceramic tile, characterized by: The blank body layer and the isolation covering blank layer, the water absorption of the blank body layer is less than 0.1%, the water absorption of the isolation covering blank layer is 0.5-1%; The isolation covering blank layer is pressed and fired by isolation covering powder, the particle size distribution of the isolation covering powder is that the sieve residue of 20 mesh screen is less than or equal to 7%, the sieve residue of 40 mesh screen is 65-80%, the sieve residue of 60 mesh screen is 88-96% and the sieve residue of 100 mesh screen is more than or equal to 98%; The chemical composition of the isolation covering powder includes SiO2 60-65%, Al2O3 19-22%, Fe2O3 0.7-1%, TiO2 0.1-0.5%, CaO 0.2-0.7%, MgO 2-2.6%, K2O 2-3%, Na2O 1-1.6% and loss on ignition 6.2-7.2% according to mass percentage.

2. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 1, wherein: The water content of the isolation covering powder is 7.2-8.0% according to mass percentage.

3. The double-layered green tile with low water absorption for enhancing the bonding strength of ceramic tiles according to claim 1, wherein: The blank body layer is pressed and fired by blank body powder, the particle size distribution of the blank body powder is that the sieve residue of 20 mesh screen is less than or equal to 2%, the sieve residue of 40 mesh screen is 55-65%, the sieve residue of 60 mesh screen is 85-95% and the sieve residue of 100 mesh screen is more than or equal to 97%.

4. The double-layered green tile with low water absorption for enhancing the bonding strength of ceramic tiles according to claim 1, wherein: The chemical composition of the isolation covering powder includes SiO2 62.63%, Al2O3 20.28%, Fe2O3 0.87%, TiO2 0.29%, CaO 0.42%, MgO 2.26%, K2O 2.64%, Na2O 1.33% and loss on ignition 6.75% according to mass percentage.

5. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 4, wherein: The raw materials of the isolation covering powder include sodium sand 8 parts, bauxite 10 parts, talc 5.5 parts, potassium sodium sand 18 parts, washed mud 24 parts, mixed mud 10 parts and yellow sand 24.5 parts according to mass fraction; The MgO content of the talc is 35-40% and the loss on ignition is 25-30% according to mass percentage, the Al2O3 content of the washed mud is 30-35% and the loss on ignition is 10-13%, the Al2O3 content of the bauxite is 45-50% and the loss on ignition is 10-13% according to mass percentage.

6. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 1, wherein: The cloth amount of the isolation covering powder is 800-1000g / m 2 .

7. The double-layered green tile with low water absorption for enhancing the bonding strength of ceramic tiles according to claim 1, wherein: The whiteness of the isolation covering blank layer is at least 20 degrees.

8. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 5, wherein: The chemical composition of the sodium sand includes SiO2 70.09%, Al2O3 16.46%, Fe2O3 0.19%, TiO2 0.09%, CaO 0.54%, MgO 0.11%, K2O 0.66%, Na2O 8.01% and loss on ignition 0.64% according to mass percentage; The chemical composition of the potassium sodium sand includes SiO2 75.82%, Al2O3 11.63%, Fe2O3 0.32%, TiO2 0.05%, CaO 0.5%, MgO 0.12%, K2O 5.44%, Na2O 2.59% and loss on ignition 0.61% according to mass percentage.

9. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 5, wherein: The chemical composition of the washed mud includes SiO2 50.27%, Al2O3 32.5%, Fe2O3 1.41%, TiO2 0.18%, CaO 0.12%, MgO 0.25%, K2O 3.16%, Na2O 0.37% and loss on ignition 10.98% by mass; The chemical composition of the mixed mud includes SiO2 68.7%, Al2O3 19.07%, Fe2O3 1.15%, TiO2 0.39%, CaO 0.4%, MgO 0.24%, K2O 1.09%, Na2O 0.2% and loss on ignition 6.91% by mass.

10. The double-layered low water absorption green tile for enhancing the bonding strength of ceramic tiles according to claim 5, wherein: The chemical composition of the yellow sand includes SiO2 75.7%, Al2O3 10.24%, Fe2O3 0.93%, TiO2 0.22%, CaO 0.33%, MgO 0.23%, K2O 1.89%, Na2O 0.32% and loss on ignition 2.63% by mass.

Images