JP2009256523A - Polypropylene resin having stain-resistance and antibacterial property, and household electric apparatus and toilet stool apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein an antibacterial agent does not so much deposit on the surface and the antibacterial property is weak because, if silicone oil and inorganic antibact erial agents are mixed by kneading simultaneously, silicone oil is oriented at the surface of a resin preferentially to the antibacterial agent. <P>SOLUTION: The polypropylene resin 1 comprises a silicone oil 3 and an antibacterial agent 4, and the antibacterial agent 4 is the one supporting or containing at least silver or zinc ion on the surface of an inorganic material having hydroxyl group, and realizes a polypropylene resin 1 having stain-resistance and antibacterial property by substituting at least one part or all part of the hydroxyl group by a hydrophobic group, because the antibacterial agent 4 orients on the surface of the polypropylene resin without being buried in the silicone oil 3 and can exhibit antibacterial property. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a polypropylene resin having antifouling properties and antibacterial properties, which is mainly used for housings and toilet seat surfaces of home appliances.

  Conventionally, as a method for imparting antifouling property to a resin, a method of kneading a water repellent or oil repellent substance such as a silicone compound into the resin has been performed (for example, see Patent Document 1).

In addition, an inorganic antibacterial agent is also kneaded in order to impart antibacterial properties (see, for example, Patent Document 2).
JP 2002-078630 A JP 2004-210929A

  However, in the above prior art, when silicone oil and an inorganic antibacterial agent are kneaded at the same time, the silicone oil is preferentially oriented on the resin surface over the antibacterial agent, so that the antibacterial agent is not deposited on the surface so much and the antibacterial property is weak. There was a problem. This is explained by the critical surface tension of the substance, which is 24 mN / m for the trimethyl group on the surface of the silicone oil and about 100 mN / m for the hydroxyl group on the surface of the inorganic antibacterial agent. Attempts to orient in the air and collect on the resin surface. Furthermore, when fluorine oil is used in place of silicone oil, the critical surface tension of the trifluoro group is 6 mN / m, so that there is a problem that the inorganic antibacterial agent cannot move to the resin surface.

  The present invention solves such problems, and is a polypropylene resin containing a silicone oil and an antibacterial agent, wherein the antibacterial agent carries at least silver ions or zinc ions on an inorganic substance having a hydroxyl group on the surface or The antibacterial agent contained is a polypropylene resin having antifouling and antibacterial properties, in which at least a part or all of the hydroxyl groups are substituted with hydrophobic groups. Usually, the surface of the inorganic antibacterial agent is hydrophilic. Although it is a hydroxyl group, substituting this hydroxyl group with a hydrophobic group such as trimethyl group or trifluoro group reduces the critical surface tension, and it is antibacterial by being oriented on the polypropylene resin surface without being buried in silicone oil. It can realize polypropylene resin with antifouling and antibacterial properties.

As mentioned above, according to invention of Claims 1-9, the polypropylene resin which has high antifouling property and antibacterial property is realizable. According to the invention described in claim 10, by adopting a polypropylene resin having high antifouling properties for the housing of home appliances, it is difficult to get food-derived stains such as coffee, tea, miso soup, and even if attached, it is easy to remove. Highly antifouling rice cookers and electric water heaters can be realized. Furthermore, since it has antibacterial properties, a very clean rice cooker, electric water heater, etc. can be realized without breeding of germs. According to the eleventh aspect of the present invention, a highly antifouling toilet seat can be realized by adopting a polypropylene resin having a high antifouling property for the toilet seat. In particular, bounce of urine and the like is scattered on the back of the toilet seat, but it is easy to remove the dirt with dry toilet paper, and there is an effect that the labor of cleaning can be saved. In addition, there is an effect that it is possible to easily remove stains that have been left without being noticed by the urine adhering to the back of the toilet seat and dried, with a light force. Furthermore, since it has antibacterial properties, a very clean toilet seat can be realized without breeding of various germs.

  A first invention is a polypropylene resin containing a silicone oil and an antibacterial agent, wherein the antibacterial agent is an antibacterial agent having at least silver ions or zinc ions supported or contained in an inorganic substance having a hydroxyl group on the surface, It is a polypropylene resin having antifouling and antibacterial properties in which at least a part or all of the groups are substituted with hydrophobic groups. Usually, the surface of inorganic antibacterial agents has hydrophilic hydroxyl groups. Replacing the hydroxyl group with a hydrophobic group such as trimethyl group or trifluoro group reduces the critical surface tension, and can be antibacterial by being oriented on the surface of the polypropylene resin without being buried in silicone oil. In addition, an antibacterial polypropylene resin can be realized.

  The second invention is a polypropylene having antifouling properties and antibacterial properties, particularly in the first invention, wherein the silicone oil has a polar group and contains a compatibilizing agent for improving the compatibility between the silicone oil and the polypropylene resin. Silicone oil and polypropylene resin are difficult to blend in, but by introducing a polar group into part of the silicone oil, the compatibilizer can blend the polar group of the silicone oil with the polypropylene resin. Since the silicone oil is finely dispersed in the polypropylene resin, it is possible to realize an antifouling polypropylene resin by covering the vicinity of the polypropylene resin surface with the silicone oil, and inorganic antibacterial agents are also deposited on the polypropylene resin surface. Antibacterial properties are added, and it has higher antifouling properties and antibacterial properties. The home appliance housing or seat made of a polypropylene resin can be realized.

  In the third invention, in particular, in the second invention, the silicone oil having a polar group is a modified silicone oil, so that the silicone oil having a polar group is easily available at a low cost. And antibacterial polypropylene resin can be realized.

  In the fourth invention, particularly in the second invention, the compatibilizer is a modified polypropylene resin, so that the modified polypropylene is easily compatible with the polypropylene resin because the base is a polypropylene resin, and the modified portion is a polar group of silicone oil. Since the polypropylene resin and the silicone oil can be compatible with each other, the polypropylene resin having antifouling properties and antibacterial properties can be realized.

  In the fifth invention, in particular, in the fourth invention, the modified silicone oil is an amino-modified silicone oil and the modified polypropylene resin is an acid-modified polypropylene resin, all or a part of which chemically react with each other, and after the chemical reaction, Due to the presence of the reactive amino-modified silicone oil, the dispersibility of the modified silicone oil can be improved by strongly bonding the modified silicone oil and the modified polypropylene resin by chemical reaction with each other. Furthermore, the unreacted modified silicone oil enters between the modified silicone oils combined with the modified polypropylene resin, so that the polypropylene resin has antifouling and antibacterial properties by covering the vicinity of the polypropylene resin surface with silicone oil. it can.

  In the sixth invention, in particular, in the fifth invention, the acid-modified polypropylene resin is a carboxylic anhydride-modified polypropylene resin, and the carboxylic anhydride-modified polypropylene resin is highly safe and easily available. Therefore, it is possible to realize a polypropylene resin having a low cost and high antifouling properties and antibacterial properties.

In the seventh invention, particularly in the fifth invention, the amino-modified silicone oil is a side-chain type amino-modified silicone oil, so that the side-chain type amino-modified silicone oil easily reacts with a carboxylic acid, and is inexpensive and easily available. Since it is possible, a polypropylene resin having a high antifouling property and an antibacterial property can be realized relatively easily and at a low cost.

  In the eighth invention, particularly in the first invention, the hydrophobic group contains at least a methyl group, whereby the hydroxyl group on the surface of the inorganic antibacterial agent is substituted with a functional group containing a methyl group having a small critical surface tension. Even if it is mixed with polypropylene resin at the same time as silicone oil, it will be deposited on the surface of the polypropylene resin without being buried in the silicone oil, so that a polypropylene resin that can achieve both high antifouling properties and antibacterial properties can be realized, especially when applied to the toilet seat A clean toilet seat that has both antibacterial and antifouling properties can be realized.

  In the ninth invention, particularly in the first invention, the hydrophobic group is a trimethylsilyl group. For example, by using an alkylalkoxysilane or a silane coupling agent, the hydroxyl group on the surface of the inorganic antibacterial agent can be easily used. Since the group can be substituted, a polypropylene resin having high antifouling properties and antibacterial properties can be realized relatively easily at low cost.

  The tenth invention is a home electric appliance case formed using the polypropylene resin having antifouling property and antibacterial property of any one of the first to ninth inventions, and the polypropylene resin having antifouling property and antibacterial property is provided. By using it for a home appliance housing, home appliances such as a rice cooker and an electric kettle with high antifouling properties and antibacterial properties can be realized.

  The eleventh invention is a toilet seat device in which at least a toilet seat is formed using the polypropylene resin having antifouling properties and antibacterial properties of any one of the first to ninth inventions, and has high antifouling properties and antibacterial properties. A sanitary toilet seat can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of a polypropylene resin having antifouling properties and antibacterial properties according to the first embodiment of the present invention. FIG. 4 shows a modified silicone oil 32 and an inorganic antibacterial agent 33 added to the polypropylene resin 31. It is a cross-sectional schematic diagram supposing the added conventional example.

  The polypropylene resin having antifouling properties and antibacterial properties of FIG. 1 includes a modified polypropylene resin 2 as a compatibilizing agent in polypropylene resin 1, a modified silicone oil 3 as a silicone oil having a polar group, and an inorganic antibacterial agent 4. Are distributed. A modified silicone oil 3 is bonded to a part of the modified polypropylene resin 2 by a chemical reaction.

  In the vicinity of the surface of the polypropylene resin 1 having antifouling properties and antibacterial properties, as shown in FIG. 1, the modified silicone oil 3 bonded to the modified polypropylene resin 2 is finely dispersed as compared with the conventional example of FIG. Further, as shown in FIG. 1, more inorganic antibacterial agents 4 are also present in the vicinity of the surface of the polypropylene resin 1 than the conventional example of FIG.

  The modified polypropylene resin 2 is schematically shown in the figure, and as shown in the figure, the modified polypropylene resin 2 is not entirely a straight line, and the length thereof is not limited to the figure. Similarly, the modified silicone oils 3 and 32 are also shown as ellipses in the figure, but the shape and size are not limited to those shown in the figure. In addition, although the inorganic antibacterial agents 4 and 33 are also shown by triangles in the figure, the shape and size are not limited to those shown in the figure.

The modified silicone oil 3 is prepared by previously modifying the modified polypropylene resin 2 with the modified silicone oil 3.
It is obtained by kneading the product obtained by reacting with the polypropylene resin 1 or by reacting the modified silicone oil 3 with the modified polypropylene resin 2 when the modified silicone oil 3 and the modified polypropylene resin 2 are kneaded with the polypropylene resin 1. In view of the simplicity of the process, the latter is desirable, and the kneading method is not particularly limited.

  In addition, the inorganic antibacterial agent 4 may be either a powder type or a pre-master batch, and when the modified polypropylene resin 2 and the modified silicone oil 3 are kneaded. Can be added simultaneously. Therefore, for example, a predetermined amount of modified polypropylene resin pellets, modified silicone oil, polypropylene resin pellets, and masterbatch inorganic antibacterial agent are put into a twin screw extruder and kneaded, and antifouling and antibacterial properties are achieved. Polypropylene resin pellets having properties can be produced. At this time, a master batch containing the modified silicone oil in a high concentration may be used, or a compound that can be used for molding as it is.

  The inorganic antibacterial agent 4 was added as a masterbatch when a masterbatch or compound prepared by previously kneading polypropylene resin 1, modified silicone oil 3 and modified polypropylene 2 was molded. A method of adding the inorganic antibacterial agent 4 may be used.

  The modified polypropylene resin 2 is not particularly limited as long as a reactive group is introduced. Further, instead of those having a reactive group introduced, those modified in advance with fluorine or silicone may be used. In the case of reacting with the modified silicone oil during the kneading with the polypropylene resin 1, one modified with carboxylic anhydride is desirable. This is because this carboxylic anhydride-modified polypropylene resin is safe, inexpensive and can be obtained relatively easily. Moreover, when making it react with a carboxylic anhydride modified polypropylene resin, the modified silicone oil which has an alkali group is needed. In this case, amino-modified silicone oil is desirable.

  There are two types of modified silicone oils: one end type, one end type, and side chain type, any of which can be used. By using side chain type having many reactive groups in the side chain, a small amount of modified polypropylene oil can be used. Thus, the effect of the present invention can be improved. Therefore, a side chain type amino-modified silicone oil is desirable.

  The content of the modified silicone oil contained in the polypropylene resin is preferably about 1 to 10 wt%. If it is small, the antifouling effect is small, and if it is large, the mechanical properties such as rigidity and impact resistance of the polypropylene resin are lowered. The modified polypropylene resin 2 is preferably about 0.1 to 5 wt%. If this is exceeded, the unreacted modified portion of the modified polypropylene resin will cause dirt to adhere, and on the contrary, the antifouling property may deteriorate.

  Next, the inorganic antibacterial agent 4 will be described. Antibacterial agents include organic compounds such as horseradish component (allyl isothiocyanate) and inorganic compounds including silver, zinc, copper, etc. Organic ones are modified silicone oil, modified polypropylene resin, polypropylene resin Inorganic materials are used because they may be altered by heat during kneading. Examples of inorganic antibacterial agents include silver-based inorganic antibacterial agent “Novalon” (registered trademark) manufactured by Toagosei Co., Ltd., inorganic antibacterial agent “Zeomic” (registered trademark) manufactured by Sinanen Zeomic, and silver-based inorganic antibacterial manufactured by Fuji Chemical Co., Ltd. Antibacterial agent “Bactekiller” (registered trademark) and the like can be mentioned, and these can also be expected to have an antifungal effect.

However, for example, “NOVALON” (registered trademark) is one in which silver ions are supported on zirconium phosphate. However, since zirconium phosphate is a ceramic, a large amount of hydroxyl groups exist on the surface thereof, When hydrophilic and high critical surface tension is present at the same time as the polypropylene resin 1 having a hydrophobic group having a small critical surface tension such as silicone oil, the one having a hydrophobic group is preferentially deposited on the resin surface. For this reason, it is necessary to add a large amount of antibacterial agent to give antibacterial properties as compared with the case where silicone oil is not present. Therefore, by substituting the functional group on the surface of the inorganic antibacterial agent 4 with a hydrophobic group, it becomes possible to exist on the surface of the polypropylene resin 1 even when it exists simultaneously with the silicone oil in the resin. Antibacterial properties can be imparted even with the antibacterial agent 4 of the system.

  The method for replacing the hydroxyl group on the surface of the inorganic antibacterial agent 4 is not particularly limited, but representative methods will be described. Using silver-based inorganic antibacterial agent “NOVALON” (registered trademark) manufactured by Toagosei Co., Ltd. as an inorganic antibacterial agent, and dimethyldimethoxysilane as an alkylalkoxysilane, the hydroxyl group on the “NOVALON” (registered trademark) surface is changed to a trimethylsilyl group. Replaced. The replacement method is as follows.

  A solution in which 80 g of methanol, 0.1 g of 28 wt% aqueous ammonia and 22 g of water were mixed was prepared. To this solution, 85 g of dimethyldimethoxysilane was added and stirred to obtain a substitution solution. 10 g of “NOVALON (registered trademark) (Product No .: AGZ330)” was added to this replacement liquid, and after sufficiently stirring, it was sealed and allowed to stand in an environment of 60 ° C. for 2 hours. Thereafter, suction filtration was performed to remove the replacement liquid, and then “NOVALON” (registered trademark) was dried at 150 ° C. for 24 hours or more. In the present embodiment, “Novalon” (registered trademark) produced in this way is used as the inorganic antibacterial agent 4.

  In this embodiment, dimethyldimethoxysilane is used as the alkylalkoxysilane. However, similar results can be obtained by using methoxytrimethylsilane, methyltrimethoxysilane, diethoxydiethylsilane, or the like. Further, for example, hexamethyldisilazane or trimethylchlorosilane may be used instead of the alkylalkoxysilane. However, when trimethylchlorosilane is used, it is not necessary to add water or aqueous ammonia, and it can be used as a mixed solution with methanol.

  Further, the alcohol serving as the solvent is not limited to methanol, and ethanol, isopropyl alcohol, butanol or the like may be used.

  Furthermore, the antibacterial agent is not limited to “NOVALON (registered trademark) (Product No .: AGZ330)”, and has a hydroxyl group on the surface, which is substituted with a hydrophobic group, and then dispersed in a polypropylene resin. Any material can be used as long as the effect can be exhibited. The antibacterial effect is confirmed by a test based on JIS Z2801. The addition amount of the inorganic antibacterial agent 4 is optimally about 0.1 wt% to 2 wt%. This is because if the amount is too small, the antibacterial effect is not exhibited, and if the amount is too large, the cause of coloring such as darkening or the deterioration of the antifouling property may be caused.

  Next, the antifouling property will be described. The antifouling shown in the present invention means that it is difficult to attach dirt in which solid matter is dissolved or dispersed in water, alcohol, oil, organic solvent, or the like, or the attached dirt is easily removed, or the liquid is dried. Thus, it is easy to remove the dry dirt on which the solid matter dissolved or dispersed has precipitated. Examples of such stains include stains derived from foods such as coffee, tea, miso soup, oil, soy sauce, dressing, vegetable juice, fruit juice, dirt such as magic and paint, or stool, urine, mud stains, The polypropylene resin having antifouling properties and antibacterial properties of the present invention exhibits a high antifouling effect against these stains, and in particular, exhibits a high effect when wiping away the dried stains with a dry wipe.

The principle of antifouling utilizes the water repellency and oil repellency of the silicone component. The silicone component has water repellency and oil repellency as compared with polypropylene resin, and repels water, alcohol, oil, organic solvent, and the like, so that it is difficult for dirt to adhere, and the attached dirt is easy to remove. In addition, when the solid contained in the soil is dried and dissolved or dispersed, the solid content adheres as a soil. When the solid content is inorganic, the water repellency reduces the binding force, and the solid content is organic. If it is oil-repellent, the bonding force becomes small and it is easy to remove.

  Conventionally, since polypropylene resin and modified silicone oil are not familiar, as shown in FIG. 4, the modified silicone oil exists as a lump of a certain size in polypropylene resin. Accordingly, the interval between the masses of the modified silicone oil becomes wide, and when the dirt 34 adheres to the portion where the modified silicone oil 32 is present on the surface of the polypropylene resin 31, it is easy to remove, but the modification The dirt 34 adhering to the location where the silicone oil 32 is not present has a removal performance comparable to that of a normal polypropylene resin.

  On the other hand, in the case of the polypropylene resin having antifouling properties and antibacterial properties of the present invention, the dispersibility of the modified silicone oil 3 is increased by the modified polypropylene 2 as a compatibilizing agent mediating the polypropylene resin 1 and the modified silicone oil 3. In other words, as shown in FIG. 1, it can be finely dispersed as compared with FIG. Therefore, the interval between the masses of the modified silicone oil becomes narrow, and the modified silicone oil is present under the adhered dirt 5, so that the antifouling property is improved.

  The antifouling and antibacterial polypropylene resin produced in this way makes it difficult to adhere to, and adheres to, dirt from foods such as coffee, tea and miso soup, dirt from magic and paint, or dirt from feces and urine. It has a high antifouling effect such as easy removal even after drying, and also has a high antibacterial effect.

  The polypropylene resin having antifouling properties and antibacterial properties of the present embodiment having the above-described effect is a housing of a home appliance having a functional unit driven by electricity inside a rice cooker, a jar pot, a juicer, a mixer, or the like, or It can be used for various products and parts that are made of polypropylene such as toilet seats and require antifouling and antibacterial effects.

(Embodiment 2)
FIG. 2 is a schematic cross-sectional view of a polypropylene resin having antifouling properties and antibacterial properties in the second embodiment of the present invention.

  The polypropylene resin having antifouling properties and antibacterial properties shown in FIG. 2 includes the inorganic material produced in the first embodiment and the modified polypropylene resin 12 as a compatibilizer and the modified silicone oil 13 as a silicone oil having a polar group. A system antibacterial agent 15 is dispersed. And by adding excess modified silicone oil 13 from the reaction point of modified polypropylene resin 12, unreacted modified silicone oil 14 will be present in polypropylene resin 11, and silicone oils are particularly familiar with each other. It exists so that the clearance gap between the modified silicone oils 13 may be filled up.

  The same effect can be achieved by a method of adding a non-reactive silicone oil. The silicone oil used in this case need not be a modified silicone oil, and may be a straight type. In that case, the unreacted modified silicone oil 14 in the figure can be treated as the same as the non-reactive silicone oil.

  In FIG. 2, the unreacted modified silicone oil 14 is illustrated by a straight line, but is not limited to this shape and size. In this way, the ratio at which the polypropylene resin surface is further covered with the modified silicone oil is increased, and the dirt 16 is easily removed, so that the antifouling property and the antibacterial property are improved as compared with the first embodiment. Polypropylene resin can be realized.

  The modified silicone oil is added in the same manner as in the first embodiment by kneading the modified polypropylene resin 12 with the modified silicone oil 13 in advance in the polypropylene resin 11 or by combining the modified silicone oil 13 and the modified polypropylene resin 12 with the polypropylene resin. 11 is obtained by reacting a part of the modified silicone oil 13 with the modified polypropylene resin 12 when kneaded into the resin 11.

  In any case, it is necessary to add an excessive amount of modified silicone oil or non-reactive silicone oil so that all modified silicone oil 13 does not react. In view of the simplicity of the process, the latter is desirable, and the kneading method is not particularly limited. For example, a predetermined amount of modified polypropylene resin pellets, modified silicone oil, polypropylene resin pellets, and an inorganic antibacterial agent are charged into a twin screw extruder, and kneaded to obtain antifouling and antibacterial polypropylene resin pellets. Can be produced. At this time, a master batch containing the modified silicone oil in a high concentration may be used, or a compound that can be used for molding as it is.

  The inorganic antibacterial agent 15 was added as a masterbatch when a masterbatch or compound prepared by kneading the polypropylene resin 11, the modified silicone oil 13 and the modified polypropylene 12 in advance was molded. A method of adding the inorganic antibacterial agent 15 may be used.

  As in the first embodiment, the modified polypropylene resin 12 is preferably a carboxylic anhydride-modified polypropylene resin, and the modified silicone oil 13 is preferably a side chain amino-modified silicone oil. The content of the modified silicone oil contained in the polypropylene resin is preferably about 1 to 10 wt%, of which unreacted modified silicone oil or non-reactive silicone oil is 0.5 to 5 wt%, which is about half of the total silicone oil content. Is desirable. The modified polypropylene resin 12 is desirably about 0.1 to 5 wt% as in the first embodiment.

  Further, the present invention can also improve the wear resistance against the antifouling property. If dirt adheres to the surface of polypropylene resin with antifouling and antibacterial properties, wipe off with a wipe such as cloth, elephant, towel, paper, etc., but if both the dirt and wipe are dry, The modified silicone oil 13 or the unreacted modified silicone oil 14 where the dirt on the surface of the polypropylene resin having antifouling property does not adhere is also rubbed, and the modified silicone oil is peeled off. However, when unreacted modified silicone oil 14 is present, unreacted modified silicone oil 14 bleeds from the inside to the surface of the polypropylene resin having antifouling properties and antibacterial properties even when rubbed off with a wipe. Therefore, the antifouling property is restored when the surface is covered with the modified silicone oil, that is, the wear resistance can be improved.

  The antifouling and antibacterial polypropylene resin produced in this way makes it difficult to adhere to, and adheres to, dirt from foods such as coffee, tea and miso soup, dirt from magic and paint, or dirt from feces and urine. It has a high antifouling effect that makes it easy to remove even after drying, and also exhibits a high antibacterial effect, and it is made of polypropylene such as a rice cooker or jar pot, or toilet seat, and requires antifouling and antibacterial effects It can be used for various products and parts.

(Embodiment 3)
FIG. 3 is an external view of a toilet apparatus according to the third embodiment of the present invention. The toilet device includes a toilet 20 and a toilet seat device 21 installed on the toilet 20, and the toilet seat device 21 has a main body 22 installed on the upper portion of the toilet 20, a toilet seat 23 for a user to sit on, and a toilet lid. 24 etc. The toilet seat 23 and the toilet lid 24 are pivotally supported at the front portion of the main body 22 so as to be rotatable. The toilet seat device 21 may be a warm water cleaning toilet seat having a cleaning function for cleaning a local part of the human body. In that case, a water supply pipe (not shown) for receiving supply of cleaning water from the water supply and an electric cable (not shown) for receiving power supply from a wall outlet are provided, and the toilet seat 23 has heating means built-in. You may do it.

  Conventionally, the toilet seat 23 is often made of polypropylene resin so that it can withstand the load of a seated person and can withstand a toilet detergent containing acid, alkali, alcohol, and the like. Polypropylene resins are generally excellent in antifouling properties, but have the disadvantage that they often soak oil and fat components. Therefore, if urine, feces, or the like adheres to the toilet seat 23, particularly on the backside, where it is usually inconspicuous, the oil and fat component penetrates and causes yellowing stains. In addition, when these stains are dried, there is a problem that they are difficult to remove by dry wiping, and there is also a problem that germs propagate using them as a nutrient source.

  In this embodiment, 1 wt% of maleic anhydride-modified polypropylene resin, 5 wt% of side chain amino-modified silicone oil, polypropylene resin, and inorganic antibacterial agent “NOVALON (registered) in which hydroxyl groups on the surface are substituted in Embodiment 1” (Trademark) (Product No .: AGZ330) "and 0.8 wt% were kneaded with a twin screw extruder to produce a compound, which was molded with an injection molding machine, and used with antifouling and antibacterial polypropylene. A toilet seat was prepared. Since the side chain type amino-modified silicone oil has a functional group equivalent of 2700, and the modified polypropylene has an acid value of 52, it is assumed that all reaction points will react. This modified silicone oil is calculated to be about 2.5 wt%.

  Next, the antifouling property will be described. When the user sits on the toilet seat 23 and performs urine or stool, the rebound adheres to the back of the toilet seat 23. Further, in the case of the warm water washing toilet seat, the hot water containing the stool adheres to the back of the toilet seat 23 by washing the hips after the stool. However, since the silicone component is water-repellent, it is difficult to attach these stains, or even if attached, the stains do not get wet and spread. Therefore, in this state, it can be easily wiped off with toilet paper.

  In addition, the back side of the toilet seat 23 is difficult to see, and such dirt may be left and dried to adhere to the toilet seat 23. Even in such a case, the oil and fat component does not permeate and the bonding force between the silicone oil and the dirt is small, so that it can be easily removed by dry wiping with toilet paper or wet elephant.

  Furthermore, by including the silicone oil and the modified polypropylene resin, the polypropylene resin having antifouling properties and antibacterial properties approaches the rubber property, and the toilet seat 23 can be prevented from being damaged. In particular, the surface of the toilet seat 23 is easily scratched because the user wipes it with toilet paper or hits a belt before use, but this is avoided by the polypropylene resin having antifouling and antibacterial properties of the present invention. be able to. For this reason, dirt does not enter the scratches, making it difficult to get dirt, and making it easy to remove it.

  The mechanism by which the polypropylene resin approaches the rubbery state is unclear, but probably due to the addition of modified polypropylene resin or modified silicone oil, the crystallinity of the polypropylene has decreased, or these additives are lubricant-like in the polypropylene resin. It is speculated that it works.

In the present embodiment, the antifouling property is described only in the toilet seat 23 of the toilet seat device 21, but is not particularly limited as long as the base material is polypropylene resin, and the main body 22, the toilet bowl 20, and the toilet lid of the toilet seat device 21 are not limited. 24. Applicable to a remote controller (not shown) for controlling the toilet seat device 21 and a nozzle (not shown) for injecting cleaning water, and particularly to a nozzle for injecting cleaning water that is difficult to perform artificial maintenance. In this case, it is possible to clean the dirt adhering to the nozzle every time after use with a small water flow, and a nozzle with improved cleanliness can be realized.

  The toilet seat 23 of the toilet seat device 21 produced in this way has a high antifouling effect such as making it difficult to get stool or urine stains attached, and removing them even if they are attached and dried. It has an antibacterial effect that prevents germs from breeding as a source.

  As described above, the polypropylene resin having antifouling properties and antibacterial properties according to the present invention has high antifouling properties, so that it can be applied to automotive parts such as bumpers other than home appliances.

Sectional schematic diagram of the polypropylene resin having antifouling properties and antibacterial properties in the first embodiment of the present invention Sectional schematic diagram of the polypropylene resin having antifouling properties and antibacterial properties in the second embodiment of the present invention External view of toilet apparatus in the third embodiment of the present invention Cross-sectional schematic diagram assuming a conventional example in which modified silicone oil is added to polypropylene resin

Explanation of symbols

1, 11, 31 Polypropylene resin 2, 12 Modified polypropylene resin 3, 13, 32 Modified silicone oil (silicone oil)
4, 15, 33 Inorganic antibacterial agent (antibacterial agent)
21 Toilet seat device 23 Toilet seat

Claims (11)

A polypropylene resin containing a silicone oil and an antibacterial agent, wherein the antibacterial agent is an antibacterial agent having at least silver ions or zinc ions supported or contained in an inorganic substance having a hydroxyl group on the surface, and at least a part of the hydroxyl group or Polypropylene resin having antifouling and antibacterial properties, all of which are substituted with hydrophobic groups. 2. The polypropylene resin having antifouling and antibacterial properties according to claim 1, wherein the silicone oil has a polar group and contains a compatibilizing agent for improving the compatibility between the silicone oil and the polypropylene resin. 3. The polypropylene resin having antifouling and antibacterial properties according to claim 2, wherein the silicone oil having a polar group is a modified silicone oil. 3. The polypropylene resin having antifouling and antibacterial properties according to claim 2, wherein the compatibilizing agent is a modified polypropylene resin. The modified silicone oil is an amino-modified silicone oil, the modified polypropylene resin is an acid-modified polypropylene resin, all or part of them chemically react with each other, and unreacted amino-modified silicone oil exists after the chemical reaction. The polypropylene resin having antifouling properties and antibacterial properties according to claim 4. 6. The polypropylene resin having antifouling and antibacterial properties according to claim 5, wherein the acid-modified polypropylene resin is a carboxylic anhydride-modified polypropylene resin. 6. The polypropylene resin having antifouling and antibacterial properties according to claim 5, wherein the amino-modified silicone oil is a side chain amino-modified silicone oil. The polypropylene resin having antifouling and antibacterial properties according to claim 1, wherein the hydrophobic group contains at least a methyl group. 2. The polypropylene resin having antifouling and antibacterial properties according to claim 1, wherein the hydrophobic group is a trimethylsilyl group. A household electrical appliance in which at least a housing is formed using the antifouling and antibacterial polypropylene resin according to any one of claims 1 to 9. The toilet seat apparatus which formed the toilet seat at least using the polypropylene resin which has antifouling property and antibacterial property of any one of Claims 1-9.