JP2006282494A - Method for producing antibacterial colored zirconia ceramic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, though the impartment of antibacterial properties to zirconia ceramic is recently performed, since the sharpening of edges is required particularly in a cutter, a baked coating on the surface thereof is shaved off, thus its effect is regarded as a question, and the retaining of the antibacterial properties to the structure itself of the zirconia ceramics is desired. <P>SOLUTION: This invention comprises: a first stage where inorganic copper salt compound crystal powder is dissolved into water or alcohol, so as to obtain a solution; a second stage where the solution is added to zirconia powder, so as to be mixed, thus copper ion-containing zirconia powder is obtained; a third stage where the copper ion-containing zirconia powder is molded, so as to obtain an intermediate product; and a fourth stage where the intermediate product is sintered in an atmospheric furnace, so as to obtain a finished product of copper oxide-containing antibacterial colored zirconia ceramic. Further, the finished product is manual cutters or motor-driven cutters, moreover, the finished product is tableware, and, additionally, the finished product is medical articles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing an antibacterial colored zirconia ceramic. More specifically, the present invention relates to a coloring effect that exhibits a green color by addition of an inorganic copper salt compound solution containing copper ions and an antibacterial performance due to the contained copper oxide. The present invention relates to a method for producing an antibacterial colored zirconia ceramic.

  In recent years, zirconia ceramic has been widely used for manual knifes for food cooking such as knives, kitchen knives, and bowls in general households. Since the white appearance is common sense, there is a great demand for colorization of the white zirconia ceramic.

Furthermore, in recent years, antibacterial properties are imparted to zirconia ceramic by a method in which a solution containing photocatalyst Tio ₂ is baked and coated on the surface of the zirconia ceramic product. The baked coating on the surface is scraped off and the effect is questioned, and it is desired to keep the zirconia ceramic structure itself antibacterial, but what was developed by adding antibacterial performance to the zirconia ceramic structure itself was There is nothing.

As described above, the zirconia ceramic product is basically white, and various precedents regarding this coloring method have been published. For example, the zirconia ceramic product has a suitable blade shape, and its material is 2 to 5 mol. % Of Y ₂ O ₃ partially stabilized white or gray pigment ZrO ₂ on the back side of the wavy or linear boundary set at the required position between the blade edge and the back of the blade body The surface layer portion extending over the surface is a surface oxide layer composed of at least one of black or black-grey Fe ₂ O ₃ , Cr ₂ O ₃ , TiO ₂ or a diffusion layer in which the oxide diffuses into the blade body. It consists of zirconia blades (see Patent Document 1) which are replaced and which form a diffusion layer with each other at the boundary between the blade body and the layer to be replaced, ceramic powder, binder and color-forming particles. Also form two types of particulates, subject to a binder removal step and sinter. In this case, the granular material is composed of different chromogenic particles and / or different concentrations of the same chromogenic particles, and has a distinctly colored region of the ceramic product (see Patent Document 2), and zirconia and Group 4 in the periodic table. A method for producing a zirconia sintered body and a method for producing the same, comprising firing an inclusion of an element (excluding zirconium) with an oxide in a hydrogen-containing atmosphere, a nitrogen-containing atmosphere or a water-containing atmosphere The zirconia sintered body obtained by the above (see Patent Document 3), or a zirconia in which a first phase mainly composed of tetragonal zirconia and at least a second phase composed of alumina particles containing at least ceria as a stabilizer is dispersed. This is a composite ceramic sintered body. As a coloring component element, an element containing at least one element selected from elements belonging to Groups 6 and 8 to 10 in the periodic table in the second phase is disclosed (see Patent Document 4).
Japanese Unexamined Patent Publication No. 60-60979 JP-A-8-81255 Japanese Patent Laid-Open No. 2003-212652 JP 2004-59374 A

  However, although the above-mentioned known patent documents describe the coloring technique, there is no consideration for antibacterial properties, and when using zirconia ceramics for food cooking knives, knives, scissors, cutters, etc. Although it is often awarded for its abrasion resistance due to hardness, it is naturally useful to develop effective means for obtaining hygienic performance such as antibacterial properties as long as food is cooked. It is not recognized, and the present invention aims to solve the technical problem of imparting antibacterial performance to the zirconia sintered body itself.

  The manufacturing method of the antibacterial colored zirconia ceramic product of the present invention is a solution obtained by dissolving a predetermined amount of inorganic copper salt compound crystal powder in a predetermined amount of water or a predetermined amount of alcohol as a result of diligent research in view of the above-mentioned problems. A first step of obtaining a copper ion-containing zirconia powder by adding and mixing a predetermined amount of the solution obtained in the first step to a predetermined amount of zirconia powder, and a copper ion obtained by the second step The third step to obtain the intermediate product by forming the zirconia powder containing the desired product shape, and the finished product of the antibacterial colored zirconia ceramic containing copper oxide by sintering the intermediate product obtained in the third step in an atmospheric furnace And a finished product is a manual knife such as a knife, scissors, cutter, knife, scalpel, razor blade, or electric knife, and further, the finished product is Tableware, container, Poon, is intended to with the dish such as fork, in addition, one in which finished products and various types of container, tweezers, medical supplies such as forceps.

  The method for producing an antibacterial colored zirconia ceramic product of the present invention is obtained by dissolving an inorganic copper salt compound crystal powder in water or alcohol to obtain a solution, and adding and mixing the solution to the zirconia powder but not containing copper ions. By obtaining a powder, forming a copper ion-containing zirconia powder into a desired product shape to obtain an intermediate product, and sintering the intermediate product in an atmospheric furnace to obtain a finished product of an antibacterial colored zirconia ceramic containing copper oxide The invention enables green coloring, and can simultaneously obtain an antibacterial effect by copper ions, and is an extremely innovative and highly practical invention.

  The present invention relates to a method for producing an antibacterial colored zirconia ceramic. More specifically, the present invention relates to a coloring effect exhibiting a green to blue color by adding and sintering an inorganic copper salt compound solution containing copper ions, and an antibacterial performance due to contained copper oxide. The method for producing an antibacterial colored zirconia ceramic product according to claim 1 comprises a predetermined amount of inorganic copper salt in a predetermined amount of water or a predetermined amount of alcohol. First step of dissolving compound crystal powder to obtain a solution, and second step of obtaining a copper ion-containing zirconia powder by adding and mixing a predetermined amount of the solution obtained in the first step to a predetermined amount of zirconia powder. And a third step of obtaining an intermediate product by forming the copper ion-containing zirconia powder obtained in the second step into a desired product shape, and an intermediate product obtained in the third step. Is characterized in that comprises a fourth step of obtaining a finished product of the antimicrobial coloring zirconia ceramic oxide containing copper by sintering in a gas furnace, a.

  Furthermore, the manufacturing method of the antibacterial colored zirconia ceramic product according to claim 2 is the manufacturing method of the antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is a knife, scissors, cutter, knife, knife, It is characterized by using manual blades such as razor blades or electric blades.

  Furthermore, the method for producing an antibacterial colored zirconia ceramic product according to claim 3 is the method for producing an antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is a tableware, container, spoon, fork or the like. It is characterized by having tableware.

  In addition, the method for producing an antibacterial colored zirconia ceramic product according to claim 4 is the method for producing an antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is a medical device such as various containers, tweezers, forceps and the like. It is characterized as a product.

  EXAMPLES Hereinafter, the manufacturing method of the antimicrobial coloring zirconia ceramic product of this invention is explained in full detail according to an Example.

  That is, the first step of the method for producing an antibacterial colored zirconia ceramic product of the present invention includes a predetermined amount of inorganic copper containing copper ions that are easily dissolved in a predetermined amount of water or a predetermined amount of alcohol in water or an alcohol solvent. The salt compound crystal powder is dissolved to obtain a solution.

  In the second step, a predetermined amount of the solution obtained in the first step is uniformly added to and mixed with a predetermined amount of zirconia powder to obtain copper ion-containing zirconia powder as a raw material.

  Next, in the third step, the intermediate product is obtained by forming the copper ion-containing zirconia powder obtained in the second step into a desired desired product shape using press molding or injection molding, slurry solidification molding or the like.

  Next, in the fourth step, the intermediate product obtained in the third step is heat-sintered in an atmospheric furnace at a temperature of 1,500 ° C. or lower to produce a finished product of antibacterial green zirconia ceramic containing copper oxide as a sintered body. To get.

  Further, if necessary, the finished product is finished as a final product by an antibacterial colored zirconia ceramic product containing copper oxide obtained by subjecting the finished product to grinding and polishing.

  As an example of the present invention, first, 1 g (A) and 5 g of copper nitrate trihydrate crystal powder (copper ion content 25%) as an inorganic copper salt compound crystal powder in 100 cc of water as a solvent. (B) and 10 g (C) were added and dissolved, respectively, to obtain three solutions.

  Next, after adding the above three dissolved solutions to zirconia powder and 5 g of each dissolved solution to 100 g of each, the mixture was mixed and dried, and then press-molded to form three rectangular plate-shaped products (A), (B), and (C). The three molded products (A), (B), and (C) were sintered at 1,450 ° C. in an atmospheric furnace to obtain three finished products (A), (B), and (C) of zirconia ceramics. It is obtained.

  Next, copper ions contained in the powders of the three finished products (A), (B), and (C) sintered are uniformly dispersed as inorganic copper oxide in the zirconia ceramic by sintering in an atmospheric furnace. Finished products (A), (B), and (C) of sintered copper oxide-containing green zirconia ceramic were obtained, and each antibacterial activity test and color difference comparison test were performed. Table 1 below shows (D) manufactured under the same conditions and subjected to performance comparison.

  As a result, in the antibacterial activity test evaluation by the Japan Food Analysis Center, the three finished products (A), (B) and (C) all showed good results in the E. coli test results, compared with the additive-free ceramic pieces (D) ( B) (C) is <10 (no viable count is recognized). Also in (A), the remaining viable count is reduced by about 10,000 minutes and antibacterial property condition of antibacterial activity test (unprocessed product comparison) The antibacterial activity significantly lower than the value of 1/100 or less remaining viable bacteria) was confirmed, and it was proved that the antibacterial colored zirconia ceramic containing copper oxide of the present invention has a strong antibacterial effect.

  Next, in the color difference measurement evaluation by Saitama Industrial Technology Center, when the additive-free product (D) Δ value reference value is 0.00, the three finished products (A), (B), and (C) are approximately proportionally colored. Since the concentration is increased and the desired color tone can be obtained, it can be controlled by adjusting the amount of copper oxide by changing the concentration of the inorganic copper salt compound crystal powder in the solution, so that the desired color tone can be easily obtained.

  The method for producing an antibacterial green zirconia ceramic of the present invention is, for example, in (C) shown in Table 1, 10 g of copper nitrate trihydrate crystal powder is mixed and dissolved in 100 cc of water, and 2.5 g of copper ions 5 g of the solution is added to 100 g of zirconia powder and uniformly mixed and then dried to fix 0.025 g of steel ions in 100 g of zirconia powder. After pressing the zirconia powder using a mold, it is sintered at 1,470 ° C. in an atmospheric furnace to obtain a green high-strength antibacterial zirconia ceramic. The amount of copper oxide contained in this zirconia powder is , 0.025 g in 100 g of zirconia.

  The method for producing an antibacterial colored zirconia ceramic according to the present invention can be used in the field of manual or electric knife, tableware, medical supplies for home use or business use, and zirconia ceramic products colored antibacterial and green are used. It can be provided.

Claims (4)

  A first step in which a predetermined amount of inorganic copper salt compound crystal powder is dissolved in a predetermined amount of water or a predetermined amount of alcohol to obtain a solution, and a predetermined amount of the solution obtained in the first step is converted into a predetermined amount of zirconia powder A second step in which the copper ion-containing zirconia powder is added and mixed to obtain the intermediate product by forming the copper ion-containing zirconia powder obtained in the second step into a desired product shape, and the third step. And a fourth step of obtaining a finished product of antibacterial colored zirconia ceramic containing copper oxide by sintering an intermediate product obtained in the process in an atmospheric furnace, and a method for producing an antibacterial colored zirconia ceramic product .   The method for producing an antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is a manual knife such as a knife, a knife, a cutter, a knife, a knife, a razor blade, or an electric knife.   The method for producing an antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is tableware such as tableware, a container, a spoon, and a fork.   The method for producing an antibacterial colored zirconia ceramic product according to claim 1, wherein the finished product is a medical product such as various containers, tweezers, and forceps.