JP2001004524A - Method for acceleration testing of long-term sanitary retentivity of glazed surface of sanitary ware and test liquid for testing acceleration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evaluate long-term sanitary retentivity of a glazed surface of a sanitary ware with good reproducibility by bringing the glazed surface into contact with a strong alkali aqueous solution or a strong acid aqueous solution of specific pH values for a long term. SOLUTION: A glazed surface of a sanitary ware or a glazed ware test piece is brought into contact with a strong alkali aqueous solution of pH of 11 or more or a strong acid aqueous solution of pH of 1 or less for a long time. Further, the glazed surface of the ware or the test piece heated to 40 to 90 deg.C is brought into contact with the strong alkali aqueous solution of the pH of 11 or more or the strong acid aqueous solution of the pH of 1 or less for a long time. Its testing time can be more shortened by heating the ware or the piece. This testing method can be utilized, for example, for a glazed surface of a sanitary ware such as, for example, a closet, a urinal, a washbowl, a hand washbowl or the like. The strong alkali aqueous solution means a solution obtained by dissolving alkaline chemicals such as sodium hydroxide or potassium hydroxide in water, and the strong acid aqueous solution means a hydrofluoric acid, a hydrochloric acid, a citric acid or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerated test method and a test solution for accelerated test of long-term hygiene retention of a glazed surface of sanitary ware.

[0002]

2. Description of the Related Art Sanitary ware surfaces are considered to be hardly deteriorated because they consist of a glaze layer, which is a chemically stable and dense inorganic oxide as compared to metal materials and organic materials. It is. However, after long-term use on the order of several years, it is observed that the dirt is fixed or that the dirt is difficult to remove unless the frequency of cleaning is increased. By the way, the glaze surface of sanitary ware such as urinals, urinals, handwashers, washbasins, etc. is generally required to have not only the initial characteristics but also high characteristics for long-term use due to the long use cycle of sanitary ware. Is done. Long-term evaluation methods, such as outdoor exposure and actual use, have been used in conventional methods.

[0003]

However, outdoor exposure and actual use vary greatly, and although relative comparison in a test sample is possible, in the case of an exposure test, for example, exposure 1
The fact that an absolute value evaluation such as 50 hours equivalent to one year of actual use cannot be performed is a problem in performing various evaluations of glaze drug properties. In actual use tests, the location of the test specimens, the number of people used, the use environment, etc. vary greatly, so although it is certainly the best evaluation method, there is also a problem that this is only a relative evaluation. . Further, there is a problem that it takes a long time for both outdoor exposure and actual use. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an accelerated test method and a test solution for an accelerated test capable of evaluating the long-term hygiene retention of a glazed sanitary ware surface with good reproducibility.

[0004]

The circumstances leading to the present invention will be briefly described below. First, I obtained a ceramic toilet bowl that had been used for several years at a long level and had dirt fixed. next,
When observing the sanitary ware, it was observed that the surface roughness of the ball surface was larger than that of the product before use. Furthermore, when the surface is closely observed, the quartz particles contained in the silica sand, which is the main component of the glaze raw material, remain despite being calcined, and a concave portion is particularly conspicuous near the quartz particles. It was observed that it was formed and became a hotbed to which bacteria and dirt were fixed. In general,
Silica, which is a component of quartz particles, has a tetrahedral unit having an internal structure of a siloxane bond (Si-O-Si), and has Si-OH on the surface. Si-OH bonds have the property of gradually dissolving in water, and siloxane bonds have high solubility in alkaline solutions. Under the actual use environment of sanitary ware, there are many opportunities to come into contact with water at all times and to come into contact with ammonia-basic water due to urination or the like. Therefore, when the sanitary ware is used for a long time, the glaze layer is gradually eroded. In addition, it is considered that recesses are formed in the vicinity of the quartz particles, probably due to preferential erosion of grain boundaries. Therefore, the reason why the surface roughness of the glaze surface during the long-term use is larger than that of the product before use is that the portions with different dissolution rates are dissolved by water and ammonia water, It is thought that the unevenness was gradually formed between the portion and the portion having a low dissolution rate. Therefore, it was thought that this phenomenon could be accelerated by bringing the glaze surface into contact with a larger basic environment. Further, it is considered that a similar result can be obtained by using a strong acid that significantly deviates from the isoelectric point (pH 3 to 5) of the glaze raw material on the acid side. In the present invention, the above idea has been verified and the present invention has been completed.

In the present invention, the glaze surface of a sanitary ware or a glazed porcelain test piece is treated with a strong alkaline aqueous solution of pH 11 or more or p-type water.
Provided is an accelerated test method for long-term hygiene retention of a glazed surface of sanitary ware, which is characterized by contacting with a strong acid aqueous solution of H1 or less for a long time. By doing so, it becomes possible to evaluate the long-term hygiene retention of the glazed sanitary ware surface in a short time with good reproducibility.

In a preferred embodiment of the present invention,
The glazed surface of the sanitary ware or glazed porcelain specimen heated to 90 ° C. is brought into contact with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less for a long time. By heating, the test time can be further shortened.

In a preferred embodiment of the present invention, the temperature of the strong alkaline aqueous solution or the strong acid aqueous solution is from 40 to 9
It should be 0 ° C. By using such a solution, the test time can be further shortened.

In a preferred embodiment of the present invention, the glazed surface of the sanitary ware or glazed porcelain test piece is treated with a strong alkaline aqueous solution of pH 11 or higher at a temperature substantially equal to that of the glazed surface or pH 1 or higher.
The present invention provides an accelerated test method for long-term hygiene retention of a glazed sanitary ware characterized by contacting with the following strong acid aqueous solution for a long time. By contacting with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less at a temperature substantially equal to that of the glazed surface, temperature fluctuations during the test are suppressed,
Testing can be performed with higher reproducibility. Here, it is preferable to heat the glazed surface to 40 to 90 ° C., because the test time can be further shortened.

In a preferred embodiment when the present invention is applied to a toilet, a step of sealing a trap hole of a toilet product with a corrosion-resistant sealing material, the step of applying a pH of 1 to the toilet bowl surface.
The method includes a step of injecting the aqueous solution into the ball such that one or more strong alkaline aqueous solutions or a strong acid aqueous solution having a pH of 1 or less come into contact. In the case of a toilet, a trap hole is present, so that it is necessary to seal that portion with a corrosion-resistant sealing material.

In a preferred embodiment when the present invention is applied to a toilet bowl, a step of sealing the trap hole of the toilet bowl product with a corrosion-resistant sealing material, the step of forming a pH of 1 on the bowl surface of the toilet bowl.
The method includes a step of injecting the aqueous solution into the ball so that at least one strong alkaline aqueous solution or a strong acidic aqueous solution having a pH of 1 or less comes into contact, and a step of covering the upper surface of the toilet with a cover. By covering the upper surface of the toilet with the cover, evaporation of the strong alkali aqueous solution or strong acid aqueous solution during the test can be prevented, and the reproducibility of the test can be improved and the test can be performed safely.

In a preferred embodiment when the present invention is carried out in a toilet bowl, a step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing the trap holes of the toilet bowl with a corrosion-resistant sealing material, The method includes a step of injecting the aqueous solution into a ball so that the aqueous solution is contacted with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less. By heating the toilet bowl to 40 to 90 ° C., the test time can be further shortened. Here, as a method of heating the toilet bowl product, both a method of directly heating the toilet itself and a method of heating the atmosphere can be used.

In a preferred embodiment when the present invention is applied to a toilet bowl, a step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing a trap hole of the toilet bowl with a corrosion-resistant sealing material, The method includes a step of injecting the aqueous solution into a ball such that a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less comes into contact, and a step of covering the upper surface of the toilet with a cover. By covering the upper surface of the toilet with the cover, it is possible to prevent the evaporation of the strong alkaline aqueous solution or the strong acid aqueous solution at the time of the test, and it is possible to improve the reproducibility of the test and to reduce the toilet product to 40 to
By heating to 90 ° C., the test time can be further shortened.

In a preferred embodiment when the present invention is implemented in a toilet, the temperature of the strong alkaline aqueous solution or the strong acid aqueous solution is set to 40 to 90 ° C.
By doing so, the test time can be further shortened.

In a preferred embodiment in which the present invention is carried out in a toilet, a step of sealing a trap hole of a toilet product with a corrosion-resistant sealing material, a method of forming a strong alkali having a pH of 11 or more at a temperature substantially equal to the glaze surface on the toilet bowl surface. The method includes a step of injecting the aqueous solution into the ball so that the aqueous solution or the strong acid aqueous solution having a pH of 1 or less is brought into contact. By bringing into contact with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less at a temperature substantially equal to that of the glazed surface, a change in temperature at the time of the test is suppressed, so that the test can be performed with higher reproducibility. Here, the glazed surface is 40
Heating to 90 ° C is preferable because the test time can be further shortened. Further, it is more preferable that the upper surface of the toilet is covered with the cover, since the evaporation of the strong alkali aqueous solution or the strong acid aqueous solution at the time of the test can be prevented, and the reproducibility of the test can be improved and the test can be performed safely. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The test method of the present invention can be used, for example, for glazed surfaces of sanitary ware such as toilets, urinals, washbasins, and handwashers. It can also be used to evaluate various test pieces regardless of the product.

In the present invention, the strong alkaline aqueous solution is
A substance in which an alkaline chemical such as sodium hydroxide or potassium hydroxide is dissolved in water (preferably water having a small amount of impurities, most preferably distilled water). A substance having a pH of 11 or more, preferably 13 or more and extremely close to 14 And The strong acid aqueous solution refers to hydrofluoric acid, hydrochloric acid, citric acid, and the like.

In the present invention, first, a test aqueous solution is prepared. As the aqueous solution, a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less is selected. The aqueous solution is placed in a container having excellent chemical resistance such as polypropylene.

Next, sanitary ware to be tested is prepared. Sanitary ware here means toilet bowl, urinal, washbasin,
Although it is a product such as a hand-washing machine or a fragment thereof, a sample that has been glazed on a sanitary ware body formed in advance to a predetermined size and then fired may be used.

In the erosion treatment of a product, the inside of the product ball and the like are mainly treated. However, since the product cannot be filled with an aqueous solution as it is, a sealing material having excellent chemical resistance such as silicone is used. Process so that it can be filled with the aqueous solution. Thereafter, the container containing the product and the aqueous solution is placed in a thermostat, set to a predetermined temperature, and heated. The heating temperature can be set arbitrarily between 60 and 80 ° C., but should be selected in relation to the processing time. After the product and the aqueous solution reach the set temperature, the aqueous solution is poured into the processing section. Further, after performing a process for preventing the aqueous solution from evaporating, the solution is left for a predetermined time. After standing, the treated part is strongly washed with a soft sponge or the like to remove excess aqueous solution.

In the treatment of the sample, the test specimen is put in a container of a predetermined size made of polypropylene, and then put in a thermostat together with the container containing the aqueous solution, set at a predetermined temperature and heated. The heating temperature can be arbitrarily set between 40 and 90 ° C., preferably between 60 and 80 ° C., but should be selected in relation to the processing time. After the sample and aqueous solution reach the set temperature, pour the aqueous solution into the container,
Allow the sample to fully soak. Further, after a lid is placed on a container in which the aqueous solution does not evaporate, the container is left for a predetermined time. After standing, the surface of the sample is strongly washed with a soft sponge or the like to remove excess aqueous solution.

The properties of the treated product and the surface of the sample are measured as usual, and are used as evaluation values of the properties after long-term use. Here, examples of the surface characteristics include glaze surface roughness (Ra) and glossiness. Ra can be measured by a stylus type surface roughness measuring device (JIS-B0651).

[0022]

EXAMPLES Specific examples will be described below. (Example 1) Corrosion aqueous solution 5% aqueous solution of sodium hydroxide Specimen 1 Sanitary ware toilet A Specimen 2 Sanitary ware toilet B Heating temperature 70 ° C Leaving time 10 hours (Example 2) Erosion aqueous solution 25% hydrochloric acid Specimen 1 Sanitary ware sample C test specimen 2 Sanitary ware sample D Heating temperature 60 ° C Leaving time 5 hours

The processing was performed under the conditions of the above embodiment. In Example 1, the entire bowl inside the toilet was treated, and the trap was sealed with silicone.
Thereafter, the toilet bowl and the container containing the aqueous sodium hydroxide solution were placed in a thermostat, set at 70 ° C. and heated. After the toilet and the aqueous solution of sodium hydroxide reached 70 ° C., the aqueous solution was poured into the bowl, covered with vinyl, treated to prevent evaporation, and allowed to stand for 10 hours. After the standing, the treated portion was strongly washed with a soft sponge or the like, then the silicone was carefully removed, further washed with water and dried.

In Example 2, the sample was put in a container made of polypropylene, and then put in a thermostat together with the container containing hydrochloric acid, set at 60 ° C. and heated. After the temperature of the sample and hydrochloric acid reached 60 ° C., hydrochloric acid was poured into the container, and a lid was further covered and treated so as not to evaporate, and then left for 5 hours. After standing, the treated part was strongly washed with a soft sponge or the like and then dried.

With respect to the obtained product and sample after the treatment, the glaze surface roughness (Ra) and the gloss were measured. The surface roughness is measured with a stylus type surface roughness meter (JIS-B0
651), the center line surface roughness (Ra) was measured.
The gloss was measured using a gloss meter.

As shown in Table 1, each of the results shows that the two types of the embodiment can achieve a state substantially similar to the actually used toilet bowl. That is, by evaluating the product or sample in this state, it is possible to evaluate the product or sample after using it for a predetermined number of years.

[0027]

[Table 1]

[0028]

According to the present invention, it is possible to provide an accelerated test method and a test solution for accelerated test, which can evaluate the long-term hygiene retention of a glazed surface of sanitary ware with good reproducibility.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuhiro Kawakami 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Equipment Co., Ltd. 1-1-1 Totoki Kiki Co., Ltd. (72) Inventor Hiroyuki Takada 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Tochiki Kiki Co., Ltd. (72) Inventor Yukinari Matsumoto Kokura, Kitakyushu-shi, Fukuoka 2-1, 1-1 Nakajima, Kita-ku Totoki Equipment Co., Ltd. (72) Inventor Minoru Suda 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Touchi Equipment Co., Ltd. (72) Inventor Shigeyuki Yamada 2D038 ZA00 2G050 AA02 BA01 BA10 CA04 DA01 EA01 EA02 EA06 EB01 EB07 EC05 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture

Claims (15)

[Claims] 1. Accelerated long-term hygiene retention of a glazed sanitary ware surface, wherein the glazed surface of the sanitary ware or glazed porcelain test piece is brought into contact with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less for a long time. Test method. 2. A sanitary ware characterized in that a glazed surface of a sanitary ware or a glazed porcelain specimen heated to 40 to 90 ° C. is brought into contact with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less for a long time. Accelerated test method for long-term hygiene retention of glazed surface. 3. The accelerated test method for long-term hygiene retention of a glazed sanitary ware surface according to claim 1, wherein the temperature of the strong alkaline aqueous solution or the strong acid aqueous solution is 40 to 90 ° C. 4. A sanitary ware glazing characterized in that the glazed surface of the sanitary ware or the glazed porcelain test piece is brought into contact with a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less at a temperature substantially equal to the glazed surface for a long time. Accelerated test method for long-term hygiene retention of surface. 5. The method according to claim 4, wherein the temperature is in the range of 40 to 90 ° C. 6. A step of sealing a trap hole of a toilet bowl product with a corrosion-resistant sealing material, and injecting the aqueous solution into the bowl so that a strong alkaline aqueous solution having a pH of 11 or more or a strong acidic aqueous solution having a pH of 1 or less comes into contact with the bowl surface of the toilet bowl. Accelerated test method for long-term hygiene retention of sanitary ware glazed surface, characterized by including a process. 7. A step of sealing a trap hole of a toilet bowl product with a corrosion-resistant sealing material, and injecting the aqueous solution into the bowl so that a strong alkaline aqueous solution having a pH of 11 or more or a strong acidic aqueous solution having a pH of 1 or less comes into contact with the bowl surface of the toilet bowl. A method for accelerating long-term hygiene retention of a glazed surface of sanitary ware, comprising a step and a step of covering the upper surface of the toilet with a cover. 8. A step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing the trap hole of the toilet bowl product with a corrosion-resistant sealing material, and a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less on the bowl surface of the toilet bowl. A method for injecting the aqueous solution into a ball so that the glaze comes into contact with the ball. 9. A step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing the trap hole of the toilet bowl product with a corrosion-resistant sealing material, and a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less on the bowl surface of the toilet bowl. A step of injecting the aqueous solution into the ball so that the bowl comes into contact with the bowl, and a step of covering the upper surface of the toilet bowl with a cover. 10. The accelerated test method according to claim 6, wherein the temperature of the strong alkaline aqueous solution or the strong acid aqueous solution is 40 to 90 ° C. 11. A step of sealing a trap hole of a toilet bowl product with a corrosion-resistant sealing material, so that a strong alkaline aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less at a temperature substantially equal to that of the glaze surface is brought into contact with the bowl surface of the toilet bowl. A method for accelerating long-term hygiene retention of a glazed surface of sanitary ware, comprising a step of injecting the aqueous solution into a ball. 12. A step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing a trap hole of the toilet bowl product with a corrosion-resistant sealing material, and a step of applying a pH of 11 or more to the bowl surface of the toilet bowl at a temperature substantially equal to the glazed surface. A method for accelerating long-term hygiene retention of a glazed surface of sanitary ware, comprising a step of injecting the aqueous solution into a ball so as to come in contact with an alkali aqueous solution or a strong acid aqueous solution having a pH of 1 or less. 13. A step of sealing a trap hole of a toilet bowl product with a corrosion-resistant sealing material, wherein a strong alkaline aqueous solution having a pH of 11 or more or a strong acidic aqueous solution having a pH of 1 or less at a temperature substantially equal to the glaze surface is formed on the toilet bowl surface. A method for accelerating long-term hygiene retention of a glazed sanitary ware surface, comprising a step of injecting the aqueous solution into a ball so as to make contact with the bowl, and a step of covering an upper surface of the toilet bowl with a cover. 14. A step of heating the toilet bowl product to 40 to 90 ° C., a step of sealing a trap hole of the toilet bowl product with a corrosion-resistant sealing material, and a step of applying a temperature substantially equal to the glazed surface to the toilet bowl surface. a step of injecting the aqueous solution into a ball so that a strong alkali aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less comes into contact with the ball, and covering the toilet bowl with a cover for a long period of time. Accelerated test method. 15. A test solution for an accelerated test of a long-term hygiene retention of a glazed surface of sanitary ware, comprising a strong alkali aqueous solution having a pH of 11 or more or a strong acid aqueous solution having a pH of 1 or less.