CN114671611B - Ceramic rock plate primer for preventing roller from rising and nailing and application thereof - Google Patents
Ceramic rock plate primer for preventing roller from rising and nailing and application thereof Download PDFInfo
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- CN114671611B CN114671611B CN202210365621.4A CN202210365621A CN114671611B CN 114671611 B CN114671611 B CN 114671611B CN 202210365621 A CN202210365621 A CN 202210365621A CN 114671611 B CN114671611 B CN 114671611B
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Abstract
The invention discloses ceramic rock plate primer for preventing a roller from lifting a rod and an application thereof. The basic mineral of the ceramic rock plate bottom slurry consists of 90-95 wt% of gibbsite and 5-10 wt% of wollastonite, and the initial melting temperature of the ceramic rock plate bottom slurry is 1260-1300 ℃. The ceramic rock plate bottom slurry can overcome the defect that a roller rod of a roller kiln is easy to lift a rod nail, and the production stability and the production cost of the ceramic rock plate are optimized.
Description
Technical Field
The invention relates to ceramic rock plate primer for preventing a roller from lifting a rod and an application thereof, belonging to the technical field of ceramic brick production and manufacturing.
Background
With the continuous development of the building ceramic industry and the popularity of new rock plate concepts in the global heat, the thin ceramic rock plate is gradually becoming a sustainable ceramic product and is deeply favored by consumers, and is widely applied to household industries such as cabinets, wardrobe, refrigerator panels and the like. The most prominent problem in the process of producing thin ceramic rock plates is the high rock plate breakage rate. The main reason for the damage of the rock plate is that the roller is easy to lift and nail at the position of the front temperature section (400-800 ℃) of the roller kiln. The formation of the stick nail has close relation with the formula of the base slurry and the distribution uniformity of the base slurry.
And performing element analysis on the rod nails of the front temperature section of the roller kiln. As an example, the chemical composition of the stick nail includes: in mass percent, K 2 O：0.47％，Na 2 O：1.34％，CaO：0.9％，MgO：30.9％，Al 2 O 3 ：24.9％，SiO 2 ：2.99％，Fe 2 O 3 ：0.26％，SO 3 :36.4%, znO:1.67%. It can be seen that the main components of the pins are magnesium oxide, aluminum oxide and sulfur trioxide. XRD analysis is carried out on the rod nails in the front temperature section of the roller kiln. The main phase composition of the rod nail comprises magnesium sulfate crystals and magnesium aluminum spinel Dan Jingxiang. The conventional primer formula in the ceramic industry uses light burned magnesia as a main raw material and sometimes auxiliary raw materials such as kaolin and/or alumina are matched. Light burned magnesium oxide is easy to hydrate to form magnesium hydroxide, and the magnesium hydroxide reacts with sulfur oxide (sulfur dioxide) gas to form magnesium sulfate crystals. The sources of sulfur oxides are: (1) generating a small amount of oxysulfide gas in the roller kiln in the natural gas or water gas combustion process; (2) the blank ball milling uses desulfurization circulating water which is prepared by a double-alkali desulfurization method, so that the desulfurization circulating water contains sulfate ions with a certain content; (3) the sulfate species in the green body feedstock decompose to produce sulfur oxides. Because the smoke exhaust fan of the roller kiln is usually arranged at the kiln head, the airflow in the kiln flows from the kiln tail to the kiln head, so that the sulfur oxide gas in the front temperature section of the roller kiln is more distributed, and the reason that the rod nails are easy to be lifted in the front temperature section of the roller kiln is explained to a certain extent. In addition, magnesium hydroxide produced by hydration of magnesium oxide reacts with aluminum oxide to form a magnesium aluminate spinel crystal phase. In summary, when the bottom slurry using magnesium oxide as a main raw material is used, the magnesium oxide in the bottom slurry is hydrated into magnesium hydroxide and falls off to react with sulfur oxide on the roller to generate magnesium sulfate crystals, and the magnesium hydroxide reacts with aluminum oxide to generate magnesium aluminate spinel. The alumina may be from a base stock or from an alumina rod stock of a roll.
Besides the damage of the rock plate blank, the rod nails can affect the surface flatness of the rock plate and reduce the definition of the ground pattern of the brick. This is because: magnesium oxide will hydrate rapidly to magnesium hydroxide. The hydratable alumina can spontaneously hydrate at normal temperature, and the hydration products of the hydratable alumina boehmite and the bayerite form a network structure to play a role in cementation hardening. Therefore, the primer is thixotropic due to hydration of magnesium oxide and aluminum oxide, blocks the dots of the silica gel roller, gradually reduces the printing quantity of the primer, and causes uneven distribution of the primer on the brick surface, unclear shading or even no primer on the blank bottom.
Disclosure of Invention
Aiming at the problems, the invention provides the ceramic rock plate primer for preventing the rod from being lifted and the application thereof, which can overcome the defect that the rod of a roller kiln is easy to lift and the production stability and the production cost of the ceramic rock plate are optimized.
In a first aspect, the present invention provides a ceramic rock laminate flooring that resists roll-up. The basic mineral of the ceramic rock plate bottom slurry consists of 90-95 wt% of gibbsite and 5-10 wt% of wollastonite, and the initial melting temperature of the ceramic rock plate bottom slurry is 1260-1300 ℃.
Preferably, the blank powder of the ceramic rock plate is a calcareous blank, and the initial melting temperature of the calcareous blank is 1145-1350 ℃.
Preferably, the chemical composition of the calcareous blank comprises: in mass percent, siO 2 ：65.0～66.0％、Al 2 O 3 ：19.0～20.0％、CaO：3.0～3.5％、MgO：0.5～0.7％、K 2 O：2.8～3.2％、Na 2 O:1.8 to 2.0 percent. In some embodiments, the calcareous billet comprises the following chemical components: in mass percent, siO 2 ：65.0～66.0％、Al 2 O 3 ：19.0～20.0％、Fe 2 O 3 ：0.5～0.7％、TiO 2 ：0.1～0.3％、CaO：3.0～3.5％、MgO：0.5～0.7％、K 2 O：2.8～3.2％、Na 2 O：1.8～2.0％、SO 3 :0.04 to 0.09 percent, loss on ignition: 5.0 to 5.2 percent.
Preferably, the chemical composition of the base mineral of the ceramic rock plate primer comprises: in mass percent, siO 2 ：2.55～5.10％、Al 2 O 3 ：59.82～63.15％、CaO：2.11～4.20％、MgO：0.12～0.24％、K 2 O：0.05～0.1％、Na 2 O:0.30 to 0.35 percent. In some embodiments, the chemical composition of the base mineral of the ceramic rock matrix comprises: in mass percent, siO 2 ：2.55～5.10％、Al 2 O 3 ：59.82～63.15％、Fe 2 O 3 ：0.01～0.03％、TiO 2 ：0.02～0.05％、CaO：2.11～4.20％、MgO：0.12～0.24％、K 2 O：0.05～0.1％、Na 2 O：0.30～0.35％、SO 3 :0.04 to 0.07 percent, loss on ignition: 29.52 to 31.55 percent.
Preferably, the ceramic rock board primer includes a glaze additive in addition to a base mineral; the glaze additive comprises 0.5-0.8wt% of sodium carboxymethyl cellulose, 0.1-0.3wt% of sodium tripolyphosphate, 50-70wt% of roller stamp-pad ink and 100-150wt% of water.
Preferably, the pH of the ceramic rock plate primer is 9-10.
In a second aspect, the invention provides the use of a ceramic rock plate primer of any one of the above-mentioned types to inhibit the lifting of a pin by a roller. And applying ceramic rock plate bottom paste for preventing the roller from lifting pins to the bottom of the rock plate body in a roller printing mode, and then firing in a kiln.
Preferably, the specific gravity of the ceramic rock plate primer is 1.20-1.26 g/mL, and the application amount is 10-12 g/m 2 。
Preferably, the firing period is 60 to 120 minutes, and the highest firing temperature is 1200 to 1220 ℃.
Preferably, the melting temperature of the ceramic rock plate primer is 60-80 ℃ higher than the highest firing temperature.
Drawings
FIG. 1 is a schematic surface view of a tile bottom tack;
FIG. 2 is an EDS scan element distribution plot of the rod nail of FIG. 1; the scale unit in the figure is 500 μm;
FIG. 3 is a surface shading effect of a ceramic rock panel using the primer of the present invention;
FIG. 4 is a graph showing the effect of magnesium oxide primer on roller closure;
FIG. 5 is a graph of the tile surface effect of a ceramic rock plate using a magnesia base slurry;
fig. 6 is a graph of the effect of the spotting of ceramic rock plates using the primer (left) and the magnesia primer (right) of the present invention.
Detailed Description
The invention is further illustrated by the following embodiments, which are to be understood as merely illustrative of the invention and not limiting thereof. Unless otherwise specified, each percentage refers to a mass percent. The following illustrates the ceramic rock plate primer of the present invention for preventing the rolling rod from being lifted and the application thereof.
Poor surface flatness of ceramic rock plates is typically caused by the following reasons, including: (1) the powder at the bottom of the brick falls on a stick, and the stick contacts with the brick surface, so that the brick surface becomes uneven; (2) the primer reaction produces a pin and adheres to the bottom of the tile. As can be seen from fig. 1, the ceramic rock plate after firing has a pin on its bottom surface, which pin forms a protrusion on the bottom of the brick. This problem is particularly pronounced on thin ceramic plate surfaces. The surface element distribution of the pins was analyzed by EDS, and the results are shown in fig. 2. Fe and Mg elements are accumulated on the surface of the rod nail. In combination with the elemental distribution and XRD pattern of the pins, it was found that the formation of the pins was accompanied by the production of magnesia-alumina spinel.
Chinese patent CN113582708A discloses a rock board primer formulation comprising 65-75 parts by weight of alumina, 12-20 parts by weight of wollastonite, 5-12 parts by weight of high purity water washed kaolin, 0.5-1.0 parts by weight of magnesia. The rock plate primer formula solves the problem that the rock plate has surface bulge by overcoming the defect that the brick primer is easy to fall on a roller rod. However, the following drawbacks remain with this rock board primer formulation: first, alumina is hydratable, and boehmite and bayerite, which are spontaneously hydrated products at normal temperature, form a network structure. Magnesium oxide also hydrates readily to form magnesium hydroxide. These have the side effect of hardening the cement, causing thixotropic of the slurry of the floor underlayment, and causing deterioration of the uniformity of the adhesion of the underlayment to the tile bottom. In addition, the magnesium hydroxide gel formed by hydration of light burned magnesium oxide causes poor fluidity of the base slurry, and the mesh on the rubber roller is easy to be blocked during roller printing, thereby influencing the continuous production of the ceramic rock plate. Second, magnesium hydroxide formed by hydration of magnesium oxide reacts with sulfur dioxide gas to form magnesium sulfate crystals, and magnesium aluminate spinel crystals formed by the reaction of magnesium hydroxide and aluminum oxide are accompanied. In summary, the formulation of the rock board primer of chinese patent CN113582708A does not solve the problem of nails caused by chemical reactions of the primer formulation well.
The invention is thatA novel ceramic rock plate primer (also called as aluminum-calcium system primer) for preventing the roller from rising the pins is provided. The basic mineral of the ceramic rock plate base slurry consists of 90-95 wt% of gibbsite and 5-10 wt% of wollastonite. Aluminum hydroxide is also called aluminum oxide trihydrate, classified into three isopycnic crystals according to its crystal structure and physicochemical properties, respectively gibbsite (gamma-Al (OH) 3 ，γ-Al 2 O 3 ·3H 2 O), bayerite (alpha) 1 -Al(OH) 3 ，α 1 -Al 2 O 3 ·3H 2 O), noralachlor (alpha) 2 -Al(OH) 3 ，α 2 -Al 2 O 3 ·3H 2 O)。γ-Al(OH) 3 The interlayer relation of (C) is BC CB BC and the density is 2.42g/cm 3 Is common in bauxite. The structural unit of bayerite (also known as granular bayerite) is Al (OH) 6 Octahedron, oxygen atoms are close packed in a similar way, the interlayer relation is similar to gibbsite, the density is 2.53g/cm, and the AC is similar to that of gibbsite 3 。ɑ 2 -Al(OH) 3 The structural unit of (2) is Al (OH) 6 Octahedron is piled up in an intermediate state of diaspore and bayerite, and is piled up like diaspore between layers. The aluminum hydroxide with the gibbsite crystal structure is selected, because the highest value of the gibbsite energy gap is lower than that of other two isomorphous crystals, and the reactivity of the gibbsite is higher; and the minimum population of H-O bonds and Al-O bonds of gibbsite indicates that the bonding force of gibbsite is minimum compared with that of bayerite and noaluminum, and the gibbsite is easier to calcine into alumina.
As an example, the chemical composition of gibbsite includes: in mass percent, al 2 O 3 ：66～67％、Fe 2 O 3 ：0.01～0.05％、TiO 2 ：0.02～0.05％、CaO：0.02～0.05％、K 2 O：0.05～0.1％、Na 2 O：0.3～0.4％、SO 3 :0.04 to 0.07 percent, loss on ignition: 32.6 to 33.1 percent. As an example, the chemical components of wollastonite include: in mass percent, siO 2 ：50.88～51.97％、Al 2 O 3 ：0.06～0.16％、Fe 2 O 3 ：0.1～0.3％、TiO 2 ：0.02～0.05％、CaO：41.0～44.0％、MgO：1.2～3.6％、K 2 O：0.05～0.1％、Na 2 O：0％、SO 3 :0.04 to 0.07 percent, loss on ignition: 2.3 to 4.1 percent.
The ceramic rock plate ground paste for preventing the roller from rising and nailing has better effect when being matched with blank powder (also called calcareous blank) of a calcareous system. The green body powder of the calcareous system comprises the following chemical components: in mass percent, siO 2 ：65.0～66.0％、Al 2 O 3 ：19.0～20.0％、Fe 2 O 3 ：0.5～0.7％、TiO 2 ：0.1～0.3％、CaO：3.0～3.5％、MgO：0.5～0.7％、K 2 O：2.8～3.2％、Na 2 O：1.8～2.0％、SO 3 :0.04 to 0.09 percent, loss on ignition: 5.0 to 5.2 percent. The chemical composition enables the rock plate blank body to have higher cutting performance. In some technical solutions, the green body powder of the calcareous system comprises the following chemical components: in mass percent, siO 2 ：65.32％、Al 2 O 3 ：19.67％、Fe 2 O 3 ：0.61％、TiO 2 ：0.23％、CaO：3.29％、MgO：0.61％、K 2 O：2.98％、Na 2 O：1.96％、SO 3 :0.09%, loss on ignition: 5.18%.
The initial melting temperature of the calcareous blank is 1145-1350 ℃. Wollastonite in the ceramic rock plate primer can prevent the primer from chemically reacting with calcareous blank to reduce the cutting performance of the rock plate. It was also found in the test that the onset of melting temperature of the ceramic rock matrix required adaptation to the calcareous billet. The blank has an excessively high initial melting temperature, and the ceramic rock plate bottom slurry has an excessively low initial melting temperature, so that a liquid glass phase bonding roller formed by high-temperature melting of the blank can generate a rod nail. The initial melting temperature of the blank is too low, and the initial melting temperature of the base slurry is too high, so that the base slurry is seriously dropped after the blank is burned. Mainly controls the initial melting temperature of the ceramic rock plate bottom slurry by controlling the wollastonite content of the ceramic rock plate bottom slurry. The initial melting temperature of the ceramic rock plate primer is preferably 1260-1300 ℃. In some technical schemes, the initial melting temperature of the ceramic rock plate bottom slurry is about 1300 ℃.
The invention selects the aluminum oxide trihydrate with aluminum hydroxide crystal phase to be used together with wollastonite, and does not directly use aluminum oxide because: on one hand, the alumina has high hardness, the ball milling time from slurry ball milling to required fineness is long, and the energy consumption is high; on the other hand, alumina has poor adsorptivity, is easy to fall off in the sintering process, and forms white dirt defect on the brick surface, so that ceramic products are degraded. Unlike light burned magnesium oxide and sulfur dioxide react to form magnesium sulfate crystals, since sulfur dioxide is more acidic than aluminum hydroxide in water-soluble sulfurous acid, aluminum hydroxide (aluminum oxide produced by thermal decomposition of aluminum hydroxide) does not react with sulfur dioxide, which largely inhibits the formation of pins. And aluminum hydroxide is amphoteric hydroxide, and can react in an alkaline base slurry system to generate soluble tetrahydroxy aluminate (meta-aluminate), which is beneficial to improving the uniformity of the base slurry.
The ceramic rock board primer of the present invention uses wollastonite to incorporate calcium oxide. Although calcite and anorthite also contain calcium oxide, calcite and anorthite are not suitable for the ceramic rock plate primer of the present invention. Calcite belongs to calcium carbonate minerals, the loss of calcium carbonate due to ignition is large, and the calcite starts to decompose to generate carbon dioxide in the vicinity of a temperature range of 825-896 ℃, which can influence the oxidation of green bricks and even can cause defects such as pinholes on the brick surfaces due to poor oxidation. In production practice, it was found that the main mineral composition of the pin also included anorthite (CaO) 0.65 Na 0.35 Al 1.65 Si 2.35 O 8 ) Or doubly feldspar (CaO) 0.85 NaO 0.14 Al 1.86 Si 2.14 O 8 ) And (3) forming plagioclase. The commercial anorthite has limited purity and is usually accompanied by the presence of albite in plagioclase minerals. Therefore, the method does not use anorthite to introduce calcium oxide components so as to avoid the anorthite raw material from introducing mineral composition of the rod nails as much as possible. Wollastonite is mainly silicon dioxide and calcium oxide, the silicon dioxide can react with alumina generated by high-temperature decomposition of aluminum hydroxide to form mullite refractory materials, and the three-system eutectic of silicon dioxide-alumina-calcium oxide can widen the firing range of the base slurry. Furthermore, wollastonite may incorporate an amount of calcium oxide to increase the bonding of the primer to the green substrate。
The chemical composition of the basic mineral of the ceramic rock plate primer comprises: in mass percent, siO 2 ：2.55～5.10％、Al 2 O 3 ：59.82～63.15％、Fe 2 O 3 ：0.01～0.03％、TiO 2 ：0.02～0.05％、CaO：2.11～4.20％、MgO：0.12～0.24％、K 2 O：0.05～0.1％、Na 2 O：0.30～0.35％、SO 3 :0.04 to 0.07 percent, loss on ignition: 29.52 to 31.55 percent. As an example, the chemical composition of the ceramic rock plate primer includes: in mass percent, siO 2 ：4.08％、Al 2 O 3 ：61.15％、Fe 2 O 3 ：0.02％、TiO 2 ：0.02％、CaO：3.37％、MgO：0.19％、K 2 O：0.10％、Na 2 O：0.30％、SO 3 :0.05%, loss on ignition: 30.36%.
The ceramic rock plate primer further comprises a glaze additive besides basic minerals. The glaze additive may include sodium carboxymethyl cellulose in an amount of 0.5 to 0.8wt% of the base mineral, sodium tripolyphosphate in an amount of 0.1 to 0.3wt% of the base mineral, roller ink in an amount of 50 to 70wt% of the base mineral, and water in an amount of 100 to 150wt% of the base mineral.
The pH value of the ceramic rock plate base slurry for preventing the roller from lifting the rod nails is 9-10.
And preparing the ceramic rock plate primer for preventing the roller from lifting the pins. The preparation method comprises the following steps: ball milling, iron removal, sieving and aging. The ball milling includes a first ball milling and a second ball milling. The first ball milling is to ball mill the basic mineral, sodium carboxymethyl cellulose, sodium tripolyphosphate and water for 2 to 4 hours, collect slurry, and the screen residue of the ball milling fineness of 325 mesh screen reaches 0.3 to 0.5 weight percent. And the second ball milling is to mix the slurry obtained by ball milling with roller stamp-pad ink, and ball milling is carried out for 2 minutes to fully stir the slurry. The slurry after the second ball milling is subjected to electromagnetic iron removal, and three-dimensional sieving is carried out through a 120-mesh screen to remove impurities. And ageing the slurry after iron removal and sieving. The ageing time is at least 48 hours, so that the water in the base paste and the roller stamp-pad ink are uniformly distributed, and good suspension property and fluidity are ensured.
Will prevent the roll from liftingThe ceramic rock plate primer of the rod nail is applied to the surface of the rock plate by a roller printing mode, for example, the primer is printed by adopting a silica gel roller lattice point extrusion type. The specific gravity of the ceramic rock plate base slurry for preventing the roller from rising and nailing is 1.20-1.26 g/mL, and the application amount is 10-12 g/m 2 . The parameters are beneficial to effectively isolating the contact between the blank bottom and the roller, prevent the vitrified liquid phase formed by high-temperature melting of the rock blank from contacting the roller to generate rod nails, and simultaneously maintain the uniformity of the brick bottom slurry. In some embodiments, the flow rate of the ceramic rock plate primer for preventing the roller from lifting the rod is 10-15 s. The beaker used to test the flow rate was a No. 4 viscosity cup. The material of the roller is preferably silica gel.
And then sintering in a kiln. The sintering period is 60-120 minutes, and the highest sintering temperature is 1200-1220 ℃. The initial melting temperature of the ceramic rock plate also needs to be matched with the firing temperature of the kiln. The melting temperature of the ceramic rock plate primer is preferably 60-80 ℃ higher than the highest firing temperature. Otherwise, the roller can generate a large number of rod nails due to the contact of the liquid glass phase of the high-temperature melting of the blank and the roller in the high-temperature sintering environment, so that the production yield is reduced and the production cost is increased due to the replacement of the roller. By way of example, the melting temperature of the ceramic rock plate primer is 80 ℃ above the maximum firing temperature of the kiln.
The present invention will be further illustrated by the following examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations upon the scope of the invention, since numerous insubstantial modifications and variations will now occur to those skilled in the art in light of the foregoing disclosure. The specific process parameters and the like described below are also merely examples of suitable ranges, i.e., one skilled in the art can make a suitable selection from the description herein and are not intended to be limited to the specific values described below.
Example 1
1. And (5) preparing ceramic rock plate primer. The primer includes a base mineral and a glaze additive. The base mineral consisted of 92wt% aluminum hydroxide and 8wt% wollastonite. The glaze additive comprises: sodium carboxymethylcellulose accounting for 0.8wt% of the basic mineral, sodium tripolyphosphate accounting for 0.15wt% of the basic mineral, roller stamp-pad ink accounting for 60wt% of the basic mineral, and water accounting for 120wt% of the basic mineral.
2. And preparing the ceramic rock plate primer. The first ball milling is to ball mill the basic mineral, sodium carboxymethyl cellulose, sodium tripolyphosphate and water for 2 hours, collect slurry, and the fineness of the ball milling reaches 0.4wt% after sieving with 325 mesh screen. And the second ball milling is to mix the slurry obtained by the first ball milling with roller stamp-pad ink, and ball milling is carried out for 2 minutes to fully stir the slurry. The slurry after the second ball milling is subjected to electromagnetic iron removal, and three-dimensional sieving is carried out through a 120-mesh screen to remove impurities. And ageing the slurry after iron removal and sieving. The ageing time is at least 48 hours, so that the water in the base paste and the roller stamp-pad ink are uniformly distributed, and good suspension property and fluidity are ensured.
3. And printing primer on the surface of the rock plate blank by adopting a silica gel roller. The specific gravity of the base stock was 1.22g/mL, the flow rate was 12s, and the applied amount was 12g/m 2 。
4. And (5) putting the rock plate blank body after printing the primer into a kiln for firing. The highest firing temperature is 1210 ℃, and the firing period is 90 minutes.
Fig. 3 shows the surface shading effect after firing of the rock blank body using the ceramic rock blank primer according to the invention. The brick bottom slurry at the bottom of the baked brick blank is uniformly distributed, the lines are clear, and the three-dimensional effect is strong. In addition, the roller in the section of the high and low boxes of the roller kiln at 400-800 ℃ is clean, and no rod nails are generated.
Comparative example 1
Substantially the same as in example 1, the only difference is that: the primer includes a base mineral and a glaze additive. The base mineral consisted of 92wt% aluminum hydroxide and 8wt% wollastonite. The glaze additive comprises: sodium carboxymethylcellulose accounting for 1.2wt% of the basic mineral, sodium tripolyphosphate accounting for 0.15wt% of the basic mineral, roller stamp-pad ink accounting for 30wt% of the basic mineral, and water accounting for 150wt% of the basic mineral.
The comparative example has an increased sodium carboxymethylcellulose content and a reduced roller stamp-pad ink content compared to example 1, which maintains good suspension properties of the base stock and reduces formulation costs. However, in the using process, the roller surface layer is closely covered with a layer of transparent sticky and slippery jelly after a longer period of practice is printed, and the jelly is sodium carboxymethyl cellulose after judgment. The mesh of the roller is blocked, and the phenomena of uneven sizing and no sizing at the bottom of the brick appear. Therefore, the content of sodium carboxymethyl cellulose in the ceramic rock plate base slurry is preferably controlled to be within 0.8 wt%.
Comparative example 2
Substantially the same as in example 1, the only difference is that: the primer includes a base mineral and a glaze additive. The base mineral consisted of 88wt% aluminum hydroxide and 12wt% wollastonite. The glaze additive comprises: sodium carboxymethylcellulose accounting for 0.8wt% of the basic mineral, sodium tripolyphosphate accounting for 0.15wt% of the basic mineral, roller stamp-pad ink accounting for 60wt% of the basic mineral, and water accounting for 120wt% of the basic mineral.
The initial melting temperature of the bottom slurry is near 1200 ℃, no rod nails are generated in the front temperature section of the kiln at 400-800 ℃, but the vitrified liquid phase of high-temperature melting of the green bricks is contacted with the roller rod due to the lower initial melting temperature of the bottom slurry formula to generate a large number of rod nails (the main mineral composition is labrade), so that the flatness of the rock plate is affected, and the labor intensity and the production cost are increased by replacing the roller rod in a large number and frequently.
Comparative example 3
Substantially the same as in example 1, the only difference is that: a primer formulation of a magnesium oxide system was used.
FIG. 4 is a graph of the effect of magnesium oxide primer on roller closure. Magnesium hydroxide gel formed by hydration of magnesium oxide causes poor fluidity of the base slurry, and is easy to block meshes on a rubber roller during roller printing, thereby influencing continuous production of ceramic rock plates.
Fig. 5 is a graph of the tile surface effect of a ceramic rock plate using a magnesia base slurry. The vitrified liquid phase of ceramic green bricks in high-temperature melting is contacted with a roller rod to generate a rod nail, so that the flatness of the brick surface is affected, and the reflection and bending of the lamp tube are serious.
Fig. 6 is a graph of the effect of the ceramic rock plate stippling using the primer of the present invention and a magnesia primer. The left graph shows the dot pattern effect of the gibbsite primer of the present invention. The right graph is a dot pattern effect graph printed by light burned magnesia base slurry. The uniformity and definition of the bottom slurry are compared, and the roller patterns of the left graph are clearer and more uniform, and the dot patterns are more solid, so that the roller patterns are not burnt and scattered like the light burned magnesia bottom slurry.
Table 1 formulation of magnesium oxide system base stock
TABLE 2 glaze slip Performance of magnesium oxide System base slip formulation
| Numbering device | Specific gravity (g/mL) | Flow rate (S) | Thixotropic properties | Suspension property |
| 1 | 1.25～1.30 | 8～9 | Thixotropic material | Precipitation |
| 2 | 1.25～1.30 | 22～28 | Severe thixotropic | Forming into paste |
| 3 | 1.25～1.30 | 9～11 | Thixotropic material | Precipitation |
| 4 | 1.25～1.30 | 8～9 | Does not thixotropic | Precipitation |
TABLE 3 production of magnesium oxide System base slurry formulation
TABLE 4 reason for the above-mentioned defects in the formulation of the magnesium oxide system primer
Claims (8)
1. The ceramic rock plate bottom slurry for preventing the roller from rising and nailing is characterized in that the basic mineral of the ceramic rock plate bottom slurry consists of 90-95 wt% of gibbsite and 5-10 wt% of wollastonite, and the initial melting temperature of the ceramic rock plate bottom slurry is 1260-1300 ℃; the blank powder of the ceramic rock plate is a calcareous blank, the initial melting temperature of the calcareous blank is 1145-1350 ℃, and the chemical composition of the calcareous blank comprises: in mass percent, siO 2 ：65.0～66.0%、Al 2 O 3 ：19.0～20.0%、CaO：3.0～3.5%、MgO：0.5～0.7%、K 2 O：2.8～3.2%、Na 2 O：1.8～2.0%。
2. The ceramic rock plate primer of claim 1, wherein the chemical composition of the base mineral of the ceramic rock plate primer comprises: in mass percent, siO 2 ：2.55～5.10%、Al 2 O 3 ：59.82～63.15%、CaO：2.11～4.20%、MgO：0.12～0.24%、K 2 O：0.05～0.1%、Na 2 O：0.30～0.35%。
3. The ceramic rock plate primer of claim 1, wherein the ceramic rock plate primer includes a glaze additive in addition to a base mineral; the glaze additive comprises 0.5-0.8wt% of sodium carboxymethyl cellulose, 0.1-0.3wt% of sodium tripolyphosphate, 50-70wt% of roller stamp-pad ink and 100-150wt% of water.
4. A ceramic rock plate primer according to claim 3, characterized in that the pH of the ceramic rock plate primer is 9-10.
5. Use of a ceramic rock plate primer to prevent rolling up of pins according to any one of claims 1 to 4, characterized in that the ceramic rock plate primer to prevent rolling up of pins is applied to the surface of the rock plate by means of roll printing and then fired in a kiln.
6. The use according to claim 5, wherein the ceramic rock plate primer has a specific gravity of 1.20-1.26 g/mL and an application amount of 10-12 g/m 2 。
7. The use according to claim 5, wherein the firing cycle is 60 to 120 minutes and the maximum firing temperature is 1200 to 1220 ℃.
8. The use according to claim 5, characterized in that the melting temperature of the ceramic rock plate primer is 60-80 ℃ higher than the maximum firing temperature.
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