JP2001206791A - Ceramic product in contact with water and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceramic product in contact with water free of penetration with time due to hydration swelling, freezing damage and sanitary problem such as pollution and excellent in dimensional precision of the product without any modifications, etc., in the manufacturing stage. SOLUTION: This ceramic product in contact with water consists of a green body and a glaze layer formed on the necessary part on the green body, and the central part of the green body is formed with a water-absorptive ceramic green body. The water absorptivity of the part on the surface of the green body on which at least the glaze layer is not formed and in contact with the inside of a water passage and water is made lower than the center part of the green body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a toilet bowl, a urinal,
The present invention relates to a ceramic plumbing product represented by sanitary ware such as a washbasin, and a method for producing the same.

[0002]

2. Description of the Related Art In general, a ceramic product has a glaze layer formed only on a necessary portion of a ceramic substrate. For example, a glaze layer is not formed on a toilet channel or a floor installation portion of a toilet. The base is exposed.

[0003] Therefore, when the base material is formed of ceramic,
Generally, pottery has water absorption, so that water permeates into the base material through the base exposed portion, causing problems such as aging due to hydration expansion and frost damage in cold regions. Therefore, conventionally, there has been devised a method in which a glass phase is generated by sintering and melting, the glass phase fills gaps between particles in the body, densifies the whole body, and eliminates water absorption.

[0004]

However, going through such a sintering process has caused large firing shrinkage and deformation of the substrate, which has been a cause of deteriorating the accuracy of product dimensions. In other words, in order to obtain the target product dimensions, the so-called slicing was performed, in which the raw dimensional shape was determined in consideration of the firing shrinkage amount and the deformation accompanying the shrinkage. The variation was large, and in some cases, a repair work such as grinding was required. The present invention has been made in view of the above circumstances, and has as its object to eliminate the problem of hygiene such as aging, frost damage, and contamination due to hydration expansion, and without any modification work during manufacturing. An object of the present invention is to provide a plumbing product made of ceramics having good product dimension accuracy.

[0005]

According to the present invention, in order to solve the above-mentioned problems, there is provided a ceramic plumbing product comprising a base material and a glaze layer formed on a necessary portion on the base material. Is composed of a water-absorbing ceramic base material, and at least a portion of the surface portion of the base material where the glaze layer is not formed, and a portion that may come into contact with the inside of the water channel and water has a water-absorbing property. A ceramic plumbing product is provided which is smaller than a central portion of the base. By doing so, the central part of the base is a water-absorbing porcelain base, so that shrinkage and deformation during firing can be suppressed as much as possible, and at least the glaze layer is formed on the surface of the base. The non-existent part, and the part that may come into contact with the inside of the headrace and the water, the water absorption is smaller than the central part of the base, so that the water absorption in the base exposed part is suppressed, and due to hydration expansion Problems such as aging and frost damage in cold regions are unlikely to occur.

In a preferred embodiment of the present invention, there is provided a ceramic plumbing product comprising a base material and a glaze layer formed on a necessary portion on the base material, wherein a central portion of the base material has an ink permeability of more than 3 mm, And among the surface portions of the base,
At least a portion where the glaze layer is not formed, and a portion which may come into contact with the inside of the water channel and the water, have an ink penetration of 3 mm or less. By doing so, the central part of the substrate is a porous and water-absorbing ceramic substrate with an ink penetration of 3 mm or more, so it can be produced with as little shrinkage and deformation as possible during firing. Among them, at least a portion where the glaze layer is not formed, and a portion which may come into contact with the inside of the water channel and the water, since the ink permeability is 3 mm or less, water absorption from the base exposed portion is suppressed. In addition, problems such as secular penetration due to hydration expansion and freezing damage in cold regions are unlikely to occur.

In a preferred embodiment of the present invention, the composition of the main component constituting the base is SiO ₂ : 45 to 70% by weight, Al ₂
O _3: a 25 to 50 _{wt%, Na 2 O, K 2} O, a total amount of at least one alkali metal oxide selected from the group consisting of Li ₂ O is not more than 2 wt%, Na ₂ O , K ₂ O, and at least one alkali metal oxide selected from the group consisting of Li ₂ O
The total amount of at least one kind of alkaline earth metal oxide selected from the group consisting of CaO, MgO, BaO and BeO is 6% by weight or less. By keeping the composition ratio of alkali metal and alkaline earth metal acting as sintering aid low,
Generation of a glass phase due to sintering and melting is suppressed, and firing shrinkage and accompanying deformation are reduced.

[0008] In a preferred aspect of the present invention, the substrate further comprises quartz, cristobalite,
At least one mineral selected from the group consisting of mullite and corundum is contained. By doing so, the strength of the base is improved.

[0009] In a preferred embodiment of the present invention, the same base and glaze as the ceramic plumbing product are used, and the width is 2 mm.
When a test piece having a size of 5 mm, a thickness of 5 mm, and a length of 230 mm is produced, the amount of shrinkage in the longitudinal direction of the test piece is set to 7% or less. By doing so, it is possible to obtain a product with small firing shrinkage and stable dimensional accuracy.

[0010] In a preferred embodiment of the present invention, the same base material and glaze as the above-mentioned ceramic plumbing product are used, and
A 4 × 130 mm test piece is manufactured, and the bending strength calculated when a three-point bending test is performed using the test piece by an autograph under the conditions of a span of 100 mm and a crosshead speed of 2.5 mm / min is 30 MPa or more. , And using the same base and glaze as the ceramic,
A test piece having a width of 25 mm, a thickness of 5 mm, and a length of 230 mm was prepared. The test piece was supported at two points with a span of 200 m, and the temperature was raised to 1000 ° C. in 4 hours.
The temperature is raised to 00 ° C. in 2 hours, and the temperature is maintained at 1200 ° C. for 1 hour, and then the amount of deflection of the test piece when naturally cooled to room temperature is 5 mm or less. By doing so,
It is possible to obtain a product having strength that can be used as a normal product, small firing deformation and stable dimensional accuracy.

In a preferred aspect of the present invention, when a test piece is manufactured using the same base and glaze as the above-mentioned water-produced ceramics, the linear thermal expansion coefficient of the test piece in the longitudinal direction is 90%. × 10 ⁻⁷ / ° C or less. By doing so, the matching with the glaze generally used for ceramic products is good, and the occurrence of defects on the glaze surface such as glaze skipping and penetration is less likely to occur. In addition, the substrate is prevented from being cut during the cooling process in the firing step of the substrate itself, and the thermal shock resistance is further improved.

In a method for producing a ceramic plumbing product according to the present invention, a base material preparation step of preparing a base material by adjusting the particle size of a ceramic raw material containing SiO ₂ and Al ₂ O ₃ as main components; After performing a forming step of forming a base, a drying step of drying the formed base, a glaze step of applying a glaze to the formed base, and a firing step, at a portion where a glaze layer is not formed, and inside the water conduit and A step of performing a water absorption prevention treatment on a surface portion which may come into contact with water is performed.
By doing so, it is possible to prevent water from penetrating from the inside of the headrace and from a surface portion that may come into contact with water, and problems such as aging caused by hydration expansion and freezing damage in a cold region are less likely to occur.

In the step of performing the water absorption preventing treatment,
Commercially available oil-based paints, lacquers, alkyd resin paints, vinyl resin paints, acrylic resin paints, epoxy resin paints, polyurethane resin paints, polyester resin paints,
The same water-absorbing effect can be obtained by applying a general paint such as a silicone resin paint, and a coating agent such as an organic / inorganic water-absorbing inhibitor, a sealer or a primer, or a filler. In a more preferred aspect of the present invention, the step of performing the water absorption preventing treatment is a step of applying a silane-based, siloxane-based, or silica-based osmotic water-absorbing agent. By doing so, in the case of silane-based and siloxane-based osmotic water-absorbing agents, the osmotic water-absorbing agent penetrates into the base material and chemically bonds with silanol groups in the base material, so that it can reach within a few mm Since a strong water absorption preventing layer is generated, it is possible to obtain a durable and long-term water absorption preventing effect. Further, in the silica-based permeable water-absorbing agent, the silica fine particles can enter the pores in the base material, fill the pores themselves, and make them closed, so that the water-absorbing effect can be obtained semipermanently. Therefore, problems such as secular penetration due to hydration expansion and freezing damage in cold regions are unlikely to occur.

As a method of applying the water-absorbing agent in the step of performing the water-absorbing prevention treatment, a general application method such as brush coating, roller brush coating, and ironing can be applied. In a more preferred aspect of the present invention, the step of performing the water absorption prevention treatment is a dipping method. By doing so, it is possible to easily apply the liquid to a portion that is difficult to apply, such as the inside of a waterway such as the inside of a trap or a rim of a toilet or a urinal, the inside of an overflow of a washbasin, or the inside of a toilet tank.

Further, the method of applying the water-absorbing agent in the step of performing the water-absorbing prevention treatment is an atomization system represented by an air spray system. By doing so, the water-absorbing agent is atomized, and it is hard to apply to the inside of toilets, urinal traps or headraces represented by rims, washbasin overflows, toilet bowl tanks, etc. Can also be easily applied.

The plumbing product made of ceramics to which the water-absorbing agent is applied is a toilet, and the predetermined surface portion is inside a trap or inside a headrace typified by a rim, and / or when a toilet is installed on a wall or floor. So that it is the part that contacts.
The headrace means not only a rim but also a part through which washing water flows during washing, such as a jet hole in a toilet. By doing so, the portion of the toilet that may come into contact with water is subjected to the water absorption prevention treatment, and problems such as aging caused by hydration expansion and frost damage in cold regions are less likely to occur.

The ceramic plumbing product to which the water-absorbing agent is applied is a washbasin, and the predetermined surface portion is inside the overflow. By doing so, the portion of the basin that may come into contact with water is subjected to the water absorption prevention treatment, and problems such as aging caused by hydration expansion and frost damage in a cold region are less likely to occur.

The porcelain to which the water-absorbing agent is applied is a urinal, and the predetermined surface portion is a portion that comes into contact with a wall or a floor when the urinal is installed, inside the trap or inside the water channel. . By doing so, the portion of the urinal that may come into contact with water is subjected to the water absorption prevention treatment, and problems such as aging caused by hydration expansion and frost damage in a cold region are less likely to occur.

The ceramic to which the water-absorbing agent is applied is a toilet tank, and the predetermined surface portion is the interior of the toilet tank and / or the unglazed portion of the bottom of the tank. By doing so, the portion of the toilet tank that may come into contact with water is subjected to the water absorption prevention treatment, and problems such as aging caused by hydration expansion and frost damage in cold regions are less likely to occur.

In a preferred embodiment of the present invention, the raw material has an average particle diameter of 1 to 20 μm, preferably 5 to 10 μm as measured by a laser diffraction type particle size analyzer. If the average particle diameter is 1 μm or less, the state of aggregation of the slurry becomes severe, making peptization difficult, and causing problems in moldability. On the other hand, if the average particle diameter is 20 μm or more, the melting and mineralization of the base material become insufficient, so that sufficient strength cannot be obtained.

In a preferred embodiment of the present invention, the molding method in the molding step is a slip casting. As a result, a large-sized complicated product represented by sanitary ware can be easily formed with high dimensional accuracy.

In a preferred embodiment of the present invention, the sintering temperature in the sintering step is 1100 to 1300 ° C. By firing at a high firing temperature of 1100 ° C. to 1300 ° C., it is possible to have a practically problematic strength of 30 MPa or more in bending strength without extremely lowering the substrate strength. If the firing temperature is lower than 1100 ° C., the melting and mineralization of the substrate become insufficient, and the desired strength cannot be obtained. On the other hand, if the temperature is higher than 1300 ° C., the fusion sintering proceeds too much, so that it is not possible to obtain the desired firing shrinkage and deformation.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the present invention, the substrate 1
The glaze layer 2 is formed on the required portion on the upper side. The base 1 is made of a water-absorbing ceramic base material, and the surface portion 3 is a portion subjected to a water absorption prevention treatment, and has a smaller water absorption than the base 1. The composition of the base 1 is SiO ₂ : 45 to 70
% By weight, Al ₂ O ₃ : 25 to 50% by weight, Na ₂ O, K ₂ O, L
the total amount of at least one alkali metal oxide selected from the group consisting of i ₂ O is 2% by weight or less, and Na ₂ O, K ₂ O, L
The total amount of at least one alkali metal oxide selected from the group consisting of i ₂ O and at least one alkaline earth metal oxide selected from the group consisting of CaO, MgO, BaO and BeO is 6
% By weight or less. By suppressing the composition ratio of the alkali metal and alkaline earth metal acting as sintering aids to a low level, the formation of a glass phase due to sintering and melting is suppressed, and firing shrinkage and accompanying deformation are reduced. Therefore, a product having good dimensional accuracy can be obtained without performing a correction operation or the like during manufacturing. In addition, since the surface portion 3 that may come into contact with water is subjected to the water absorption prevention treatment, water does not penetrate into the base material, and problems such as aging due to hydration expansion and frost damage in cold regions are caused. It is a product that is unlikely to occur.

The ceramic plumbing product of FIG. 1 is made of φ14 × 130 mm
The bending strength calculated when performing a three-point bending test by using an autograph using the test piece under the conditions of a span of 100 mm and a crosshead speed of 2.5 mm / min is 30 MPa or more. In addition, a test piece having a width of 25 mm, a thickness of 5 mm, and a length of 230 mm was prepared using a base and glaze having the same configuration and composition as the ceramic plumbing product, and the test piece was subjected to a span of 20 mm.
0m at two points, heated to 1000 ° C in 4 hours,
Further, the temperature was raised to 1200 ° C in 2 hours,
After holding for a while, the test piece is naturally cooled to room temperature and the amount of deflection of the test piece is 5 mm or less. Furthermore, when a test piece is manufactured using a base material and a glaze having the same configuration and composition as the ceramic, the linear thermal expansion coefficient of the test piece in the longitudinal direction is 90 × 10 ⁻⁷ / ° C. or less.

The above-mentioned porcelain is made to penetrate aging by hydration expansion,
There is no problem in hygiene such as frost damage and contamination, and the accuracy of the product dimensions is good without any modification work during manufacturing.
Therefore, it can be widely used for a basin, a urinal, a toilet, a baby bath, a hand basin, a toilet tank, and the like.

The ceramic plumbing product shown in FIG. 1 can be produced, for example, by the following method. Particle preparation of ceramic raw material mainly composed of SiO ₂ and Al ₂ O ₃ , preparation of raw material with average particle diameter of 1 to 20 μm measured by laser diffraction type particle size analyzer, slurry casting, slurry casting After performing a forming step of forming a forming base by a method such as, a drying step of drying the forming base, a glaze step of applying a glaze to the forming base, and a firing step at a temperature of 1100 to 1300 ° C., the glaze layer is formed. The part that is not formed, and
A step of applying a silane-based, siloxane-based, or silica-based permeable water-absorbing agent by brushing, dipping, or air spraying on the inside of the water channel and on the surface portion 3 which may come into contact with water. When producing a ceramic plumbing product by the above method, in the firing step, at least the amount of shrinkage in the longitudinal direction is 7% or less, and the width 30 produced under the same conditions as the ceramic up to the step before drying, A test piece molded body having a thickness of 15 and a length of 260 mm is supported at a span of 200 mm, and the amount of deflection when calcined under the same calcining conditions as that of the porcelain is 20 mm or less in terms of the calcined body thickness of 10 mm.

Next, the ceramic raw materials used in the present invention will be described. The ceramic raw material refers to both a raw material used as a normal raw material for a solute and a raw material used as a refractory raw material. Here, the solubilized base material is, for example, pottery stone, feldspar, quartzite, mica, kaolin, frog eye clay, Kibushi clay, dolomite, and the like, and the refractory raw material is, for example, limestone, ban shale, Chamotte, limestone clay, refractory clay, flint clay, bauxite, magnesia clinker, etc. It is desirable to use the raw material for the solute and the refractory raw material together. It is better to use refractory raw materials such as raw materials with low contents of alkali metal oxides and alkaline earth metal oxides such as rosacea and chamotte raw materials than in the case where the green body is prepared using only the composition of the solubilized raw materials. This is because it is easy to reduce metal oxides and alkaline earth metal oxides.

[0028]

FIG. 2 shows the composition of the base material, the chemical composition, and the crystalline minerals of the example of the present invention and the comparative example. The base material was prepared by weighing predetermined raw materials, wet-pulverizing 35 parts of water and an appropriate amount of sodium silicate as a peptizer in a pot mill to adjust the average particle diameter to 6 μm. Next, the raw material slurry was poured into a gypsum mold capable of being formed into a predetermined shape of a sample for measuring physical properties, and was molded and removed from the mold to form a test piece. Test pieces were dried at 40 ° C for 24 hours and then
4 hours to 1200 ° C in 2 hours.
After holding at 0 ° C. for 1 hour, it was calcined by a heat curve of naturally cooling. Next, about Examples 1-5, only a surface part brush-coats a silane type | system | group permeable water absorption inhibitor, dipping,
It was applied by air spray and dried at 40 ° C. for 6 hours. Further, a silica-based permeable water-absorbing agent was applied by dipping, and dried at 40 ° C. for 6 hours.

The bending strength of the base was determined by a test piece of φ14 × 130 mm and a span of 1 by an autograph manufactured by Shimadzu.
It is a value measured by a three-point bending method under the conditions of 00 mm and a crosshead speed of 2.5 mm / min.

The sintering deformation amounts are width 30, thickness 15, length 2
A value obtained by supporting a 60 mm test piece (unfired base) with a span of 200 mm at the time of firing and measuring the deflection amount after firing and the thickness of the test piece. Since the amount of deflection at this time is inversely proportional to the square of the thickness of the test piece after firing, the amount of deflection converted when the thickness is 10 mm by the following equation is defined as the amount of deformation. Firing deformation amount = amount of deflection measurements × (thickness of test piece after baking) ^{2/10 2}

The amount of deformation upon reheating is as follows: width 25 mm, thickness 5
A test piece (fired material) having a length of 230 mm and a length of 230 mm was supported at two points with a span of 200 m, and the temperature was raised to 1000 ° C. in 4 hours, and further raised to 1200 ° C. in 2 hours.
After holding at 0 ° C. for 1 hour, the amount of deflection of the test piece when naturally cooled to room temperature is defined as the amount of deformation upon reheating. However, when the thickness of the test piece is not 5 mm, since the amount of deflection is inversely proportional to the thickness of the test piece, the corrected value is used as the deformation amount at the time of reheating. The correction method is to measure the amount of deformation at the time of reheating with two types of test pieces having different thicknesses, calculate n by the following equation, and further obtain the amount of deformation at the time of reheating when the thickness of the test piece is 5 mm. . Deformation amount 2 = Deformation amount 1 x (Thickness 1 / Thickness 2) ⁿ Deformation amount 1: Deformation amount at the time of reheating with test piece of thickness 1 Deformation amount 2: Deformation amount at the time of reheating with test piece of thickness 2 n: constant for correction

As the ink permeability other than the surface portion, a base fracture surface is used instead. For the measurement method, please refer to JI
Implemented in accordance with SA5207, width 30 and thickness 1
5. Break the test piece of 130 mm in length, immerse the fracture surface in a red ink solution (1% concentration of eosin Y solution) for 1 hour or more, wipe off the ink, and determine the maximum penetration size that has permeated into the substrate. It is a measured value.

The ink permeability of the surface portion is 30 for width and 1 for thickness.
5. After blocking the surface of the test piece with a length of 130 mm, such as the back surface and cross-section, which has not been subjected to the water absorption prevention treatment, with paraffin or resin so that the red ink does not penetrate, the amount of red so that the surface part is sufficiently immersed This is a value obtained by immersing the sample in an ink solution (eosin Y solution having a concentration of 1%) for 1 hour or more, wiping off the ink, breaking the sample, and measuring the maximum permeation dimension that has permeated into the substrate.

FIG. 3 shows the physical properties and chemical analysis values of the example and the comparative example. Comparative Example 1 has a general composition of the melt base material, and since the sintering has completely progressed, the ink permeability is 0.1 mm for both the fracture surface and the surface portion. However, it can be seen that firing shrinkage and deformation show the largest values. Comparative Example 2 is a composition obtained by replacing feldspar and dolomite containing a large amount of sintering aid components with kaolin from Comparative Example 1. Since the amount of the alkali metal oxide is 2% by weight or more, the baking shrinkage is 7.3%, the deformation is still as large as 19.2 mm, and the surface is not subjected to the water absorption preventing treatment.
In this state, the ink penetration is 8.0 mm or more, and water absorption from the surface cannot be prevented at all. Comparative Example 3 is a case where a refractory raw material such as chamotte is used in combination, and is a preparation in which the amount of alkali metal oxide and the amount of alkaline earth metal oxide of the base material itself are reduced as much as possible. In this case, the firing shrinkage is 3.5.
%, The deformation amount is 4.8 mm, which is considerably smaller.
However, since the surface portion was not subjected to the water absorption preventing treatment, the ink penetration from the surface portion was 8.0 mm or more, and as in Comparative Example 2, water absorption was not prevented at all.

Example 1 has the same composition as Comparative Example 2,
The silane-based osmotic water-absorbing agent is brush-coated on the surface. The ink permeability of the fracture surface is porous at 8.0 mm or more, while the ink permeability from the surface is 0.5 mm. However, the amount of the alkali metal oxide in the substrate itself was 2% by weight or more, and the firing shrinkage and deformation amount were slightly higher. Example 2 has the same composition as Comparative Example 3 and is obtained by applying a silane-based permeable water-absorbing agent by brush coating. The ink permeability of the surface is 0.5 mm, the firing shrinkage is 3.5%, and the deformation is 4.
8mm, very small.

Example 3 has the same composition as that of Comparative Example 3 except that a silane-based osmotic water-absorbing agent is applied to the surface by dipping. The ink penetration from the surface is 0.
It is 1 mm, and a water absorption preventing effect can be obtained almost completely. Example 4 has the same composition as Comparative Example 3, and has a surface portion coated with a silane-based permeable water-absorbing inhibitor by air spray. The ink penetration from the surface is 0.
The thickness is 3 mm, and although the effect of preventing water absorption is slightly inferior to that of the dipping coating, a practically sufficient effect of preventing water absorption can be obtained. Example 5 has the same composition as Comparative Example 3, and has a silica-based permeable water-absorbing agent coated on the surface by dipping. Also in this case, a sufficient effect of preventing water absorption with an ink penetration of 0.8 mm can be obtained.

[0037]

Industrial Applicability According to the present invention, there is no problem in hygiene such as aging, frost damage and contamination due to hydration swelling, and the porcelain with good accuracy of product dimensions without any modification work during manufacturing. It is possible to provide a plumbing product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a general stool type toilet according to an embodiment of the present invention. (A) Cross-sectional view in the front-rear direction of a stool toilet (b) Enlarged view of rim cross-section

FIG. 2 shows a base composition, a chemical composition, and a crystalline mineral of Examples and Comparative Examples of the present invention.

FIG. 3 shows physical properties and chemical analysis values of the examples and comparative examples shown in FIG.

[Explanation of symbols]

 1: Base part 2: Glaze layer 3: Base surface part (water absorption prevention treatment part)

Claims (19)

[Claims] 1. A ceramic plumbing product comprising a base material and a glaze layer formed on a necessary portion on the base material, wherein a central portion of the base material is made of a water-absorbing ceramic base material, and a surface of the base material Of the part, at least the part where the glaze layer is not formed, and the part that contacts the inside of the headrace and water,
A water supply product made of ceramics, wherein water absorption is smaller than a central portion of the base. 2. A ceramic plumbing product comprising a base material and a glaze layer formed on a necessary portion on the base material, wherein a central portion of the base material has an ink permeability of more than 3 mm and a surface portion of the base material. Among them, at least a portion where a glaze layer is not formed, and a portion that contacts with water inside the water channel and water has an ink permeability of 3 mm or less. 3. The composition of a main component constituting said base material is Si
O ₂ : 45 to 70% by weight, Al ₂ O ₃ : 25 to 50% by weight, and the total amount of at least one alkali metal oxide selected from the group consisting of Na ₂ O, K ₂ O and Li ₂ O Is at most 2% by weight, and at least one alkali metal oxide selected from the group consisting of Na ₂ O, K ₂ O and Li ₂ O and at least one selected from the group consisting of CaO, MgO, BaO and BeO The ceramic plumbing product according to any one of claims 1 and 2, wherein the total amount of one kind of alkaline earth metal oxide is 6% by weight or less. 4. The ceramic product according to claim 3, wherein the base further contains at least one mineral selected from the group consisting of quartz, cristobalite, mullite, and corundum as crystals. Plumbing products. 5. The same base and glaze as the ceramic plumbing product, width 25 mm, thickness 5 mm, length 230
5. A ceramic plumbing product according to claim 3, wherein when a test piece of mm is produced, the shrinkage in the longitudinal direction of the test piece is 7% or less. 6. A test piece of φ14 × 130 mm is prepared using the same base and glaze as the ceramic plumbing product, and a span of 100 mm and a crosshead speed of 2.5 mm /
The bending strength calculated at the time of a three-point bending test under the conditions of min is 30 MPa or more, and the same base and glaze as the ceramic plumbing product are used, and the width is 25 mm, the thickness is 5 mm, and the length is 230 mm. A test piece was prepared, and the test piece was supported at two points with a span of 200 m.
The temperature rises to 0 ° C in 4 hours, further rises to 1200 ° C in 2 hours, holds at 1200 ° C for 1 hour, and then naturally cools to room temperature, and the amount of deflection of the test piece is 5 mm or less. The ceramic plumbing product according to claim 3 or 4, wherein: 7. When a test piece is produced using the same material and glaze as the ceramic plumbing product, the linear thermal expansion coefficient of the test piece in the longitudinal direction is 90 × 10 ^-7 /
The ceramic plumbing product according to claim 3, wherein the temperature is not more than ℃. 8. The ceramic product according to claim 1, wherein the ceramic plumbing product is any one of a basin, a urinal, a toilet, a baby bath, a hand basin, and a toilet tank. Plumbing products. 9. The method for producing a ceramic plumbing product according to claim 1, wherein the ceramic raw material mainly composed of SiO ₂ and Al ₂ O ₃ is subjected to particle size adjustment to produce a base material. After performing a base preparation step, a forming step of forming a forming base, a drying step of drying the forming base, a glaze step of applying a glaze to the forming base, and a firing step, a portion where a glaze layer is not formed And performing a water absorption prevention treatment on the inside of the headrace and on a surface portion that may come into contact with water. 10. The ceramic plumbing product according to claim 9, wherein the step of performing the water absorption preventing treatment is a step of applying a silane-based, siloxane-based, or silica-based permeable water-absorbing agent. Production method. 11. The method for producing a ceramic plumbing product according to claim 9, wherein the method of applying the water-absorbing agent in the step of performing the water-absorbing prevention treatment is a dipping method. 12. The ceramic plumbing product according to claim 9, wherein the method of applying the water-absorbing agent in the step of performing the water-absorbing prevention treatment is an atomization method represented by an air spray method. Manufacturing method. 13. The ceramic plumbing product to which the water absorption prevention treatment is applied is a toilet bowl, and the predetermined surface portion is inside a trap or inside a water channel represented by a rim, and / or a wall when the toilet is installed. The method for producing a ceramic plumbing product according to any one of claims 9 to 12, wherein the portion is in contact with a floor surface. 14. The ceramic plumbing product according to claim 9, wherein the ceramic plumbing product to which the water absorption prevention treatment is applied is a wash basin, and the predetermined surface portion is an inside of an overflow. Production method. 15. The ceramic plumbing product to which the water absorption prevention treatment is applied is a urinal, and the predetermined surface portion comes into contact with a trap or an inside of a water channel, and / or a wall or a floor when the urinal is installed. The method for producing a ceramic plumbing product according to claim 9, wherein the part is a part. 16. The porcelain to which the water absorption preventing treatment is applied is a toilet tank, and the predetermined surface portion is an interior of the toilet tank and / or a non-glazed portion of the bottom of the tank. A method for producing a ceramic plumbing product as described in the above. 17. The method of claim 9, wherein the raw material has an average particle diameter of 1 to 20 μm as measured by a laser diffraction particle size analyzer. 18. The method for producing a ceramic plumbing product according to claim 9, wherein the molding method in the molding step is a slurry casting molding. 19. The firing temperature in the firing step is 1
The method for producing a ceramic plumbing product according to claim 9, wherein the temperature is 100 to 1300C.