JP2019044141A - Molded body, home appliance, and toilet member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress adhesion of dirt. A molded product containing a base resin and an additive having a melting point lower than the melting point of the base resin and solid at room temperature, having a surface roughness Sa of 300 nm or less, and falling droplets on the surface. A molded product having an angle of 90 ° or less. By effectively exposing additives such as lubricants to the surface of the molded product to make the surface difficult for droplet stains to adhere to, a significant improvement in antifouling property can be expected. [Selection diagram] FIG. 7

Description

  The present invention relates to a molded article that is excellent in liquid repellency and hardly adheres to a surface, and relates to household appliances and toilet members using the molded article.

  Conventionally, efforts have been made to impart antifouling properties to the product surface for the purpose of reducing the labor of cleaning. Attempts have also been made to impart antifouling properties to resin moldings widely used in home appliances, etc. by surface coating or kneading additives into a base resin.

  One index of the antifouling property is a contact angle with a droplet on the surface of the molded body.

  As shown in FIG. 1A, the contact angle is an angle formed between the contact surface of the molded body 1 and the interface of the liquid droplet 2 when the liquid droplet 2 is attached to the surface of the molded body 1.

  As the contact angle approaches 0 degrees, the surface of the molded body 1 and the droplet 2 become more familiar, and as the contact angle approaches 180 degrees, adhesion to the surface of the molded body 1 becomes difficult.

  Another index is the falling angle. As shown in FIG. 1B, the falling angle is an angle at which the compact 1 on which the droplet 2 is placed is gradually inclined from the horizontal position, and the droplet 2 starts to slide on the surface of the compact 1. That is.

  The closer the tumbling angle is to 0 degrees, the easier it is for the droplet 2 to be removed from the surface of the molded body 1, and the closer the tumbling angle is to 90 degrees, the more difficult the droplet 2 is to separate from the surface of the molded body 1.

  The surface coating is a means for improving the antifouling property, and after molding of the molded body, the surface of the molded body contains a silicone, a fluorine compound, or the like that improves water repellency, that is, a water contact angle, in a later step. A coating agent is applied and dried and cured to impart antifouling properties. Apply two or three coats including primer and top coat as necessary to give antifouling properties.

  In this method, since the surface of the molded body is covered with the antifouling substance by the coating agent, an antifouling effect is exhibited, but the process and cost increase, and depending on the material of the molded body, the adhesion to the surface of the molded body may be There is a problem that the coating film is easy to peel off from the surface of the molded body.

  On the other hand, the additive is kneaded into the base resin of the molded body by kneading an antifouling compound that improves water repellency into the base resin together with other additives in advance, and molding the pellet using the pellet. By this, the member to which antifouling property was provided simultaneously with shaping can be obtained.

  Conventionally, as a technique for kneading an additive into a base resin of a molded body, a resin composition containing a polypropylene-based resin and silicone-grafted polypropylene and silicone oil has been proposed. A molded body using this resin composition has high water repellency and can be easily removed even if dirt adheres to the surface of the molded body (see, for example, Patent Document 1).

  In addition, it has been proposed that the toilet seat is constituted by a resin molded body in which a lubricant is mixed into a base resin. By improving the sliding of the surface of the resin molded body constituting the toilet seat, the surface of the molded body is less likely to be scratched, and can be easily removed even if dirt is attached (for example, Patent Document 2). reference).

JP 2012-214777 A JP 2000-189345 A

  However, the molded body molded using the resin described in Patent Document 1 can easily remove dirt even when dirt adheres, but it does not suppress the adhesion of dirt to the surface of the molded body itself. Absent.

  Further, the toilet seat described in Patent Document 2 improves the wiping property of the pseudo-soil, but does not suppress the adhesion of the droplet dirt.

  An object of the present invention is to solve the above-described conventional problems, and it is an object of the present invention to improve the antifouling property because dirt hardly adheres thereto.

  In order to solve the above-mentioned conventional problems, the molded article of the present invention is a molded article containing a base resin, an additive having a melting point lower than the melting point of the base resin and solid at room temperature, and having a surface roughness Sa. Is 300 nm or less, and the drop angle of the droplet on the surface is 90 ° or less.

  The molded body of the present invention can provide a molded body in which droplets slide down the surface and droplet dirt or the like is difficult to adhere. Moreover, even if dirt adheres, it can be wiped off easily. Therefore, it is possible to obtain a molded article having a very excellent antifouling property.

(A) explanatory diagram of contact angle, (b) explanatory diagram of sliding angle The perspective view of the droplet adhesion evaluation apparatus in Embodiment 1 of this invention Top view of the droplet adhesion evaluation device Diagram showing the same liquid Cross-sectional schematic diagram of the drop weight test The figure explaining an example of the droplet adhesion evaluation The perspective view which shows the toilet apparatus and member in Embodiment 2 of this invention Plan view showing the body and body case of the toilet device Cross section of the toilet seat

  The molded product of the first invention is a molded product containing a base resin, an additive having a melting point lower than the melting point of the base resin, and a solid additive at normal temperature, having a surface roughness Sa of 300 nm or less, and a surface In this case, the drop angle of the liquid droplet is 90 ° or less.

  Since the melting point of the additive is lower than the melting point of the base resin, the base resin hardens first at the time of molding, and the additive is extruded by the injection pressure while maintaining fluidity, so that it easily moves to the surface. Therefore, the additive is easily distributed on the surface of the molded body, and the effect of the additive is easily exhibited.

In addition, the surface smoothness may be improved and the slipperiness of the droplets may be excellent. The reason why the surface smoothness is improved is that a lower melting point than the base resin keeps the liquid state longer and the surface area becomes smaller due to the surface tension, so that a smooth layer can be formed on the surface of the base resin. This is because when the smoothness is improved, there is less resistance when the droplet falls on the surface, and the sliding property is improved. Further, when the surface smoothness is improved, it becomes difficult for dirt to accumulate in the fine irregularities on the surface, and the dirt removal property is also improved.

  Furthermore, an additive that is solid at room temperature is used. If it is liquid near room temperature, the liquid additive that floats on the surface of the molded body can be wiped off or outflowed when performing wiping operation or cleaning with running water, etc. There is a concern that is likely to decline.

  Therefore, by using an additive that is solid at room temperature, it is possible to obtain a molded body in which dirt in contact with the surface easily slips, that is, dirt does not easily adhere. Moreover, even if dirt remains, since it is excellent in surface slipperiness, it is possible to obtain a molded body that is easy to wipe off dirt.

  In the molded product of the second invention, the sliding angle is 45 ° or less.

  The smaller the falling angle, the better the droplet sliding property, so that particularly excellent antifouling properties can be obtained. Moreover, since the slipperiness becomes high, surface wear due to wiping and cleaning is suppressed, and a durable molded body that is hardly damaged can be obtained.

  In the molded article of the third invention, the additive is a lubricant.

  By using a lubricant, it is possible to obtain a molded article having excellent droplet sliding properties.

  The melting point of the lubricant is preferably 140 ° C. or lower, more preferably 100 ° C. or lower. When the melting point is high, the lubricant hardens before moving to the base resin surface, and the effective exposure to the surface of the lubricant or the smoothness is poor.

  The addition amount of the lubricant is preferably 0.1 to 10 parts by weight, more preferably 1 to 5 parts by weight.

  If the amount added is small, the effect of improving lubricity is small, and if it is too large, the strength is lowered.

  In the molded product of the fourth invention, the additive is a hydrocarbon-based additive.

  A lubricant having —CH 3 group or —CH 2 group having low surface free energy is present on the surface of the base resin. Therefore, since it is excellent in water repellency and slidability, it is possible to impart the effect of suppressing the adhesion of contaminants and improving the wiping property when adhered. Moreover, since there are few functional groups weak to an acid and an alkali, it is excellent also in chemical resistance.

  In the molded product of the fifth invention, the base resin is polypropylene.

  In particular, when the additive contains a hydrocarbon-based additive and the resin is polypropylene, the compatibility is good, so that the additive not only easily distributes on the surface but also easily disperses inside, so the surface is worn, etc. Even if it is shaved by the above, it is possible to obtain a molded article having an excellent durability because the additive easily stays inside.

  In addition, since it is a general-purpose resin with excellent chemical resistance, it is excellent in durability even at sites where it comes into contact with detergents and drugs.

  The molded body of the sixth invention contains an inorganic additive in the molded body.

  For example, even when the strength of the resin is reduced due to the inclusion of a lubricant or the like, the strength can be maintained or improved by adding an inorganic additive such as glass fiber or talc.

  The molded article of the seventh invention contains an antibacterial agent in the molded article.

  Because it is a molded product that does not easily adhere to liquid droplets, it is difficult for bacteria and other germs derived from the soil to propagate. However, the inclusion of an antibacterial agent further improves the antifouling, antibacterial, and cleanliness of the molded product surface. be able to.

  The household electrical appliance of the eighth invention uses the molded body according to any one of the first to seventh inventions.

  By using the above-mentioned molded article for home appliances, since the droplets attached to the surface easily slide down the surface, dirt is difficult to adhere, and even when dirt is attached, an effect of improving wiping can be expected.

  Therefore, it is possible to obtain a household electrical appliance having a very excellent antifouling property.

  Especially, it is excellent in the adhesion suppression effect especially with respect to not only horizontal but also the inclined member or product, or the member or product with the antifouling target surface facing downward.

  The member for toilet of the eighth invention uses the molded article according to any one of the first to seventh inventions.

  In particular, when the molded body is used as a toilet member, urine stains and the like are less likely to adhere, and even when adhered, it is easy to wipe off and has a high antifouling effect.

  A toilet seat or main body case according to a tenth aspect of the invention is the toilet member described above.

  In particular, it is highly effective when used for toilet seats and body cases that are easily contaminated with urine stains.

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

(Embodiment 1)
The molded body 1 disclosed in the present embodiment is assumed to be used for products, parts, structures and the like that are required to have antifouling properties, but is not limited thereto.

  The material of the base material of the molded body 1 is not particularly specified as long as the molded body 1 can maintain its shape in a durable manner. The molded body 1 can be appropriately selected in consideration of required appearance quality, mechanical properties, water repellency, durability, functionality, transparency, cost, and the like.

  The material of the base material of the molded body 1 is, for example, polyethylene, polypropylene, polystyrene, AS resin, ABS resin, acrylic resin, polycarbonate, polyethylene terephthalate, polymethyl methacrylate, polyamide, polyvinyl chloride, polyacetal, polyvinyl alcohol, polylactic acid. , Polyester, polytetrafluoroethylene, polymethylpentene, cycloolefin polymer, polyphenylene sulfide, polysulfone, polyamideimide, and the like, which are not particularly specified.

  In addition, homopolymers, block copolymers, random copolymers, etc. can be used as polypropylene, but copolymers with other resins are used, or ethylene-propylene copolymers, polybutadiene, polyisoprene, styrene-ethylene-butadiene-styrene. A material in which an elastomer such as a block copolymer (SEBS) is blended can also be used.

  Also, a mixture of a plurality of types of resins may be used.

  Moreover, in order to provide the required mechanical property, thermal property, liquid repellency, etc., an additive composed of inorganic, organic, or a mixture thereof may be contained.

  As additives, for example, antioxidants, flame retardants, UV absorbers, light stabilizers, metal deactivators, antistatic agents, antifogging agents, nucleating agents, antibacterial agents, antifungal agents, foaming agents, stabilizers , Plasticizers, fillers, reinforcing materials, fibers, pigments, rubber components, water repellents, slidability improvers, oils, and the like, or a plurality of them.

  When a lubricant is contained, the lubricant is not particularly specified. As the lubricant, paraffin wax, polyethylene-based, polypropylene-based hydrocarbon-based and olefin-based lubricants and waxes, those obtained by subjecting some of them to modification treatment such as oxidation, stearic acid, hydroxystearic acid, etc. Fatty acids, fatty alcohols, fatty acid amides, metal soaps such as calcium stearate and zinc stearate, and ester lubricants such as butyl stearate and glycerol monoacetate, but are not limited to these. Absent. For example, NOFAloy (registered trademark), high wax (trademark), or the like may be used. A plurality of types may be used.

  In addition, as a confirmation method when an olefinic additive is contained in polypropylene, for example, DSC, TG-DTA, GC / MS, NMR, IR, GPC, and the like can be used. It is not limited.

  Furthermore, it is also possible to contain silicone-based, fluorine-based, olefin-based water-repellent additives such as silicone oil and silicone resin.

  In order to improve the dispersibility and performance of the additive, for example, a lubricant obtained by dispersing or binding paraffin or the like in a suitable resin may be used. At this time, the resin may be a plurality of types or polymers.

  It is also possible to improve the strength by adding inorganic substances such as glass fiber and talc. In addition, it is also possible to use a filler such as calcium carbonate, titanium oxide, zinc oxide, barium sulfate, mica, aluminum hydroxide, antimony oxide, calcium phosphate, glass balloon, a pigment, or a flame retardant.

  Furthermore, you may contain an antibacterial agent. As an antibacterial agent, Ag type, Zn type, Cu type or the like, or those supported on a carrier such as silica, alumina, zeolite, phosphate, silicate, etc., or organic type There are antibacterial agents, natural organic antibacterial agents, etc., but they are not specified.

  Although the molded object 1 is produced by injection molding, extrusion molding, blow molding, compression molding, etc., it does not designate the west.

  For example, in injection molding, a material is melted in a heated cylinder, the molten material is injected and pressed into a mold, and a molded product is obtained after cooling.

  Materials used for injection molding, that is, base resins, lubricants and other additives, other resin materials, rubber materials, etc., are mixed in advance or kneaded with a twin-screw kneader etc. It is desirable to pelletize.

  In the present embodiment, polypropylene is used as the base resin, and polypropylene having an MFR of 3 to 70 g / min is used.

  In addition, the molded body as described above is a housing and parts of household appliances such as washing machines, air conditioners, refrigerators, rice cooker jar pots, mixers, toilet parts such as toilet seats and body cases, or bathroom floors, walls, and ceilings. It can be used for products and parts that are not limited to antifouling, such as bathtubs, portable toilets, children's toilets, and automobile bumpers.

(Example)
Hereinafter, the present embodiment will be described more specifically. In addition, this invention is not limited by this Example.

  First, polypropylene as the base resin, lubricants as additives, antioxidants, reinforcing materials, rubber materials, other additives, etc. are kneaded and pelletized with a biaxial kneader and then molded with an injection molding machine. The molded body 1 was obtained. The melting point of polypropylene was about 160 ° C.

  At this time, additives that have already been masterbatched and resins and additives that should not be kneaded may be mixed before molding without biaxial kneading. Absent.

  Moreover, since the melting point of the additive used for the lubricant is lower than that of the resin, when using a twin-screw kneader, it is desirable that the lubricant charging temperature into the screw portion is lower than the temperature of the screw kneading portion.

  Next, a method for evaluating liquid repellency on the surface of the molded body 1 is shown below.

  As a typical index of liquid repellency, a contact angle and a falling angle of 5 μL or 20 μL of distilled water were selected. A contact angle meter DM-501 type manufactured by Kyowa Interface Science Co., Ltd. was used for measuring the contact angle and the sliding angle. The drop angle was expressed as> 90 ° when the droplet did not fall even when the substrate surface was vertical.

  When the surface roughness Sa of the sample used in the examples was evaluated using a laser microscope, Ra was 1.0 μm or less, or 0.5 μm or less.

  Moreover, droplet adhesion evaluation was performed as follows.

  As shown in FIG. 2 and FIG. 3, an evaluation device 3 simulating a toilet is produced, and water that is colored black and whose surface tension is adjusted is jetted from the jetting part 4 to the inside of the toilet bowl at a constant speed and rebounds on the inside of the toilet bowl. The area of the droplet (an example is shown in FIG. 4) attached to the back surface of the toilet seat 5 was evaluated. The adhered droplet 6 was binarized after drying, the area was calculated, and a quantitative comparison was made. The smaller the area, the smaller the area.

At this time, the flat plate of the polypropylene resin described in Comparative Example 1 is attached to the half side of the back surface of the toilet seat, the flat plate described in the example is attached to the line-symmetrical position, and the example described with respect to the flat plate described in the comparative example is attached. The area ratio of the droplets adhering to the flat plate was evaluated.

  In order to simply evaluate the mechanical strength, a falling weight test was performed as shown in FIG. The flat molded body 7 is placed on a ring-shaped table 8 and a weight 9 having a weight of 500 g is vertically dropped from the specified height in the cylindrical guide 10 so that the molded body 7 is cracked. evaluated. The higher the cracking height, the stronger the strength. A cushion material 11 is placed on the molded body 7 to reduce the drop impact of the weight.

  Further, as a reference, the mechanical strength evaluation of a tensile test, a bending test, and a Charpy impact test was performed on some samples of the molded body 7. The mechanical strength was evaluated in a test environment of about 23 ° C., and the tensile test was performed at a test speed of 50 mm / min and a distance between chucks of 115 mm with reference to JIS K7161. The bending test was performed at a test speed of 2 mm / min and a fulcrum distance of 64 m with reference to JIS K7171. The Charpy impact test was conducted with a notch type A with reference to JIS K7111.

  Moreover, the wiping property evaluation was performed as follows.

  For making the soil, coffee having a composition similar to that of feces was used. Drop instant coffee diluted to 0.2%, heat dry at 40 ° C for 60 minutes, wipe the dry cloth with a load of about 1kg, reciprocate 5 times, and visually check the remaining dirt after wiping. confirmed.

Example 1
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

The molded body was formed into a flat plate by kneading and pelletizing 100 parts of polypropylene resin as a base material with 3 parts of a paraffinic lubricant having a melting point of about 70 ° C.

  The contact angle / rolling angle of water was 109 ° / 40 ° when it was 5 μL and 107 ° / 19 ° when it was 20 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property was favorable.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the flat plate-shaped molded body when the weight was dropped from a height of 120 cm or more.

(Example 2)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded body was formed into a flat plate by kneading and pelletizing 100 parts of polypropylene resin as a base material, 1 part of a paraffinic lubricant having a melting point of about 70 ° C. and 5 parts of talc.

The contact angle / rolling angle of water was 104 ° / 73 ° when it was 5 μL and 103 ° / 29 ° when it was 20 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property was favorable. Moreover, it was 39 nm when the surface roughness was measured. Compared with the flat plate of Comparative Example 1, the surface roughness is small, and it is considered that smoothness was improved by adding an additive having a low melting point.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the flat plate-shaped molded body when the weight was dropped from a height of 150 cm or more.

(Example 3)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded body was formed into a flat plate by kneading and pelletizing 100 parts of a polypropylene resin as a base material, 2 parts of a paraffinic lubricant having a melting point of about 70 ° C. and 5 parts of talc.

  The contact angle / rolling angle of water was 109 ° / 47 ° when it was 5 μL and 107 ° / 21 ° when it was 20 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property was favorable.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the flat plate-shaped molded body when the weight was dropped from a height of 140 cm or more.

  Compared with the molded body of Example 2, the molded body of Example 3 has improved contact angle and sliding angle by increasing the amount of lubricant added.

Example 4
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded body was formed by kneading and pelletizing 3 parts of a paraffinic lubricant having a melting point of about 70 ° C. and 5 parts of talc into 100 parts of polypropylene resin as a base material, thereby forming a flat plate.

The water contact angle / rolling angle was 110 ° / 41 ° at 5 μL and 105 ° / 18 ° at 20 μL. Moreover, about the wipeability evaluation of dirt, the wipeability was favorable.
Moreover, it was 51 nm when the surface roughness was measured. Compared to Comparative Example 1, the surface roughness is small.

  Furthermore, as a result of the droplet adhesion evaluation, the adhesion area of the flat plate described in Example 4 was 1/2 or less as compared with the flat plate of Comparative Example 1. A part of the results is shown in FIG. The left side of the center is the flat plate described in Comparative Example 1, and the right side is the flat plate described in Example 4. It can be seen that the amount on the right is less.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the flat plate-shaped molded body when the weight was dropped from a height of 140 cm or more.

  Furthermore, as a reference evaluation, the tensile strength was 35 MPa, the bending strength was 49 MPa, the flexural modulus was 2070 MPa, and the Charpy impact test was 3.1 kJ / m2.

  Compared with the molded body of Example 2, the molded body of Example 4 has improved contact angle and sliding angle by increasing the amount of lubricant added.

  Moreover, since the fall angle | corner is improving the molded object of Example 4 compared with the molded object of a comparative example, the adhesion prevention function of a droplet is improving.

Moreover, the molded object of Example 4 is improving mechanical strength by mix | blending talc compared with the molded object of Example 1. FIG.

(Example 5)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded body was formed into a flat plate by kneading and pelletizing 5 parts of a paraffinic lubricant having a melting point of about 70 ° C. and 5 parts of talc into 100 parts of polypropylene resin as a base material.

  The contact angle / rolling angle of water was 107 ° / 42 ° when 5 μL, and 105 ° / 18 ° when 20 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property was favorable. Moreover, it was 79 nm when surface roughness was measured. Compared with Examples 2 and 4 in which the amount of lubricant added is small, it is large. When the surface was observed with a laser microscope, many pores were observed. This is considered to be due to the vaporization of the lubricant having a low melting point, and it is considered that the surface roughness was increased due to the generation of a larger number of pores due to the increase in the amount of addition.

  Furthermore, when droplet residual property evaluation was performed, compared with the flat plate of the comparative example 1, the adhesion area of the flat plate of Example 5 was 1/2 or less.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the plate-shaped molded body when the weight was dropped from a height of 130 cm or more.

  The molded product of Example 5 had almost the same performance as the molded product of Example 4, although the amount of lubricant added was increased. The amount of lubricant is considered to be almost saturated.

(Example 6)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  As a base material, 100 parts of polypropylene resin as a base material was kneaded and pelletized with 8 parts of a paraffinic lubricant having a melting point of about 70 ° C. to form a flat plate.

  The contact angle / rolling angle of water was 108 ° / 45 ° when it was 5 μL and 107 ° / 21 ° when it was 20 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property was favorable.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the plate-shaped molded body when the weight was dropped from a height of 130 cm or more.

  In the molded body of Example 6, the amount of lubricant is increased as compared with the molded body of Example 5. It can be seen that when the amount of the lubricant is increased, the sliding angle is deteriorated. When the metal mold | die which produced the molded object of Example 6 was confirmed, the lubricant had adhered to the metal mold | die. This is probably because excessive lubricant was unevenly distributed and deposited on the surface. It is considered that the surface roughness of the molded body was increased by the excessive lubricant, and the slipperiness of the droplets was deteriorated. When the surface roughness was measured, it was 183 nm. When the surface was observed with a laser microscope, a large number of pores were confirmed in the same manner as in Example 5, and it was considered that excessive lubricant was vaporized and the surface roughness was increased. From the results of Examples 2, 4, 5, 6 and Comparative Example 1, the surface roughness is decreased by the addition of the lubricant, but excessive addition is thought to cause an increase in the surface roughness and deteriorate the slipperiness.

(Example 7)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded product is a rubber additive 3 comprising 100 parts of polypropylene resin as a base material, 3 parts of a paraffinic lubricant having a melting point of about 70 ° C., 5 parts of talc, and a styrene-ethylene-butadiene-styrene block copolymer (SEBS). The part was kneaded and pelletized to form a flat plate.

  The contact angle / fall angle of water was 108 ° / 42 ° for 5 μL and 106 ° / 21 ° for 20 μL. Moreover, when wiping property evaluation of dirt was performed, the wiping property was good.

  Further, when a falling weight test was performed as the mechanical strength, a crack was generated in the flat molded body when the weight was dropped from a height of 150 cm or more.

  It was confirmed that the impact strength of the molded body of Example 7 was improved by adding a rubber-based additive.

(Example 8)
The molded body 7 was produced by the above production method and evaluated. The results are shown in Table 1.

  The molded body was formed by kneading and pelletizing 100 parts of polypropylene resin as a base material, 3 parts of a paraffinic lubricant having a melting point of about 70 ° C., 5 parts of talc, and 3 parts of PP graft-polymerized silicone additive to form a flat plate.

  The contact angle / fall angle of water was 106 ° / 49 ° for 5 μL and 103 ° / 23 ° for 20 μL. Moreover, when wiping property evaluation of dirt was performed, the wiping property was good.

  The molded body of Example 8 ensured predetermined performance in both contact angle and sliding angle even when a silicone additive was blended.

Example 9
The molded body was molded by kneading and pelletizing 3 parts of a fatty acid amide-based lubricant having a melting point of 90 ° C. and 5 parts of talc into 100 parts of a polypropylene resin to produce a flat plate.

  The water contact angle / rolling angle was 101 ° / 56 ° for 5 μL and 98 ° / 24 ° for 20 μL. Moreover, when wiping property evaluation of dirt was performed, the wiping property was good.

  The molded product of Example 9 was lower than the molded product of Example 4 using a paraffinic lubricant, but performance was ensured for both contact angle and sliding angle.

(Comparative Example 1)
The molded body was molded by adding 5 parts of talc to 100 parts of polypropylene resin as a base material and kneading and pelletizing to produce a flat plate.

  The contact angle / rolling angle of water was 96 ° /> 90 ° at 5 μL and 95 ° /> 90 ° at 20 μL. Moreover, it was 89 nm when the surface roughness was measured. Moreover, when the wiping property evaluation of dirt was performed, in order to wipe off dirt, the wiping 5 times or more was required.

  Further, when a drop weight test was performed as a mechanical strength evaluation, cracks occurred in the flat plate-shaped molded body when the weight was dropped from a height of 150 cm or more.

  Since the molded article of Comparative Example 1 does not contain the additive disclosed in the present invention, it is considered that the falling angle could not be secured.

(Comparative Example 2)
The molded body was kneaded and pelletized by adding 5 parts of a fluororesin powder having a melting point of about 300 ° C. to 100 parts of polypropylene resin as a base material to produce a flat plate.

  The contact angle / fall angle of water was 95 ° /> 90 ° at 5 μL. Moreover, when the wiping property evaluation of dirt was performed, in order to wipe off dirt, wiping 5 times or more was necessary.

(Comparative Example 3)
The molded body was kneaded and pelletized by adding 3 parts of a silicone oil (non-modified, viscosity of about 12,500) having a melting point of <0 ° C. to 100 parts of a polypropylene resin as a base material to produce a flat plate. .

  The contact angle / fall angle of water was 95 ° /> 90 ° at 5 μL. Moreover, when the wiping property evaluation of dirt was performed, the wiping property of dirt was favorable.

  However, after the wiping operation was performed a plurality of times, the same wiping property evaluation of the dirt was performed. In order to wipe off the dirt, wiping five or more times was necessary.

(Comparative Example 4)
The molded body was formed by kneading and pelletizing 3 parts of a paraffinic lubricant having a melting point of about 70 ° C. and 5 parts of talc into 100 parts of polypropylene resin as a base material, thereby forming a flat plate. In addition, the surface was filed after molding to increase the surface roughness.

  The water contact / rolling angle was 124 ° /> 90 ° for 5 μL and 113 ° / 66 ° for 20 μL. Moreover, when the surface roughness was measured, it was 330 nm. Compared to Example 4, although the materials were the same, it was confirmed that the surface roughness increased, and the surface roughness greatly affected the falling of water.

(Embodiment 2)
7 and 8 show a toilet apparatus and its members using the material of the present invention.

  7, 12 is a toilet apparatus, 13 is a toilet seat, 14 is a main body, 15 is a toilet bowl, 16 is a toilet lid, 17 is a washing nozzle, 18 is an operation part, and in FIG. 8, 19 is a main body case.

  The formulation is similar to that described in Example 4. The toilet seat 13 of the toilet apparatus was molded using a material obtained by kneading and pelletizing 3 parts of a paraffinic lubricant having a melting point of 70 ° C. and 5 parts of talc into 100 parts of polypropylene resin. The polypropylene resin used in the present embodiment also contains an antioxidant, and may contain a weathering agent, a flame retardant, an antibacterial agent, other fillers, a pigment, an antibacterial agent, and the like as necessary.

  Antioxidants include phenolic, phosphorus-based, and sulfur-based types, and may be appropriately selected as necessary.

  The toilet seat 13 according to the present embodiment is configured as described above, so that the back surface of the toilet seat 13 to which urine stains are particularly likely to adhere, in the toilet device, has a urine adhesion amount of about ½ compared to the conventional case in normal use. Became. In the toilet seat 13 of the present embodiment, the cleaning timing is twice as long as the conventional one, and the careability is improved. Moreover, the adhering dirt could be wiped off well and the wiping property was good.

  Furthermore, by applying the composition of the present configuration to the body case 19 where urine stains are likely to adhere, an adhesion suppressing effect is easily exhibited and the careability can be improved.

(Composition of toilet seat)
FIG. 9 is a sectional view of the toilet seat.

  As shown in FIG. 9, the toilet seat 300 includes an upper toilet seat casing 310, a toilet seat heater 330 in which a cord heater 332 is disposed on a soaking plate 331 made of aluminum foil, a heat insulating material 340 made of polystyrene foam, The lower toilet seat casing 320 is configured as a main constituent member.

  The material of the upper toilet seat casing 310 may be any material as long as the toilet member can maintain its shape in a durable manner, and is not particularly specified. The toilet member can be freely selected in consideration of required appearance quality, mechanical properties, water repellency, durability, functionality, transparency, cost, and the like. In this embodiment, polypropylene resin is used.

  As in Example 1, the lower toilet seat casing 320 uses polypropylene resin as a base resin, and knead and pelletize 100 parts of polypropylene resin with 3 parts of a paraffin-based sliding additive having a melting point of about 70 ° C. We use what we did.

  The lower toilet seat casing 320 is kneaded with a paraffinic sliding additive having a melting point of about 70 ° C. Since the paraffinic slidable additive has a lower melting point than that of the polypropylene resin, it can be easily dispersed in the polypropylene resin at the time of kneading or molding, and can exhibit a sufficient antifouling effect. Since the paraffinic slidable additive has high fluidity in the resin composition, a phenomenon occurs in which the paraffinic slidable additive moves toward the surface of the molded body. Therefore, the ratio of the presence of paraffinic slidable additives on the surface of the molded body is increased, and high antifouling properties and abrasion resistance can be achieved.

  When the upper toilet seat casing 310 and the lower toilet seat casing 320 are completed, the inner peripheral edge and the outer peripheral edge of each other are joined to form a hollow ring shape.

  In the toilet seat heater 330, a cord heater 332 covered with a soft vinyl chloride insulating coating is spaced on the surface of a heat equalizing plate 331 formed of a substantially horseshoe-shaped aluminum foil with a part of the front portion cut off. The heat generated by the cord heater 332 is conducted to the soaking plate 331 and diffused over the entire soaking plate 331. The toilet seat heater 330 is provided with a cord heater 332 so that the entire surface of the seating surface 313 can be heated, and in particular, the density is changed depending on the place so that the thigh and buttocks of the seated user can be comfortably heated. It is.

  Further, a thermistor which is a temperature detection means (not shown) and a thermostat which is an excessive rise prevention means are installed on the surface of the soaking plate 331, and the cord heater 332, the thermistor and the thermostat are connected by lead wires.

  The toilet seat heater 330 in the present embodiment maintains the upper surface of the upper toilet seat casing 310 in a state where it is kept at a set temperature. The set temperature can be changed according to the user's preference by an operation switch (not shown), and can be adjusted in the range of 35 ° C to 40 ° C. The upper surface temperature of the upper toilet seat casing 310 is set to 40 ° C. in order to prevent the user from getting low-temperature burns.

The toilet seat heater 330 is attached to the upper toilet seat casing 310 with double-sided tape or the like. Since the lower toilet seat casing 320 is kneaded with a paraffin-based slidable additive, the double-sided tape or the like is easily peeled off. Since the toilet seat heater 330 is attached to the upper toilet seat casing 310 that is not kneaded with a paraffin-based sliding additive, peeling of the toilet seat heater 330 is suppressed.

  The heat insulating material 340 is integrally formed of foamed polystyrene that is an independent foam, and has a substantially horseshoe shape. The shape of the inner periphery and the outer periphery of the heat insulating material 340 is substantially similar to the shape of the inner periphery and the outer periphery of the upper toilet seat casing 310, and covers the front and side portions of the upper toilet seat casing 310 and the toilet seat heater 330. It is a shape that can be.

  The toilet seat heater 330 is provided with a cord heater 332 so as to increase the amount of heat generated on both sides where the thighs of the seated user come into contact, and the heat insulating material 340 insulates the main part of the toilet seat heater 330. It has a configuration. A heat insulating space 305 is formed between the lower surface of the heat insulating material 340 and the lower toilet seat casing 320.

  The heat released downward by radiation and convection from the toilet seat heater 330 is suppressed from moving downward by the heat insulating material 340.

  By sticking the toilet seat heater 330 to the lower surface of the upper toilet seat casing 310 and disposing the heat insulating material 340 below the toilet seat heater 330, the heat of the toilet seat heater 330 is suppressed from being transmitted to the lower toilet seat casing 330.

  The lower toilet seat casing 320 is kneaded with a paraffin-based sliding additive, and the ratio of the paraffin-based sliding additive existing on the surface of the lower toilet seat casing 320 is high. The paraffinic slidable additive in the lower toilet seat casing 320 becomes liquid when the melting point or a temperature close to the melting point is reached. When the user wipes off the dirt on the lower toilet seat casing 320 in a liquid state, the slidable additive that has become liquid with the dirt is also wiped off, which may reduce the antifouling property.

  In this embodiment, since the heat insulating material 340 is disposed below the toilet seat heater 330, the thermal influence on the lower toilet seat casing 320 from the toilet seat heater 330 is very small.

  In addition, since a paraffin-based slidable additive having a melting point of about 70 ° C. is used, even when the heat insulating material 340 is not used, the lower toilet seat casing 320 reaches a temperature at which the slidable additive becomes liquid. There is no. For example, in the summer, the toilet space is assumed to reach 40 ° C., but even if it reaches 40 ° C., it uses a paraffinic sliding additive having a melting point of about 70 ° C. Never become.

  In this embodiment, a slidable additive having a melting point of about 70 ° C. is used. However, if the melting point is 55 ° C. or higher, even when the temperature of the toilet space reaches 40 ° C., it does not become liquid. Even if the user wipes off the dirt, the paraffinic slidable additive on the surface of the lower toilet seat casing 320 is not wiped off. A sliding additive having a melting point of about 50 ° C. may be used. If the melting point is about 50 ° C., when the temperature of the toilet space reaches 40 ° C., it is assumed that a part of the sliding additive becomes liquid. However, even if it becomes liquid, since it is a small amount, the deterioration of the antifouling property is suppressed.

  As described above, the molded body according to the present invention is less liable to adhere to liquid stains and easy to wipe and clean, so that home appliances, housing-related products, automotive parts, industrial machine parts, consumables, daily necessities, etc. It can be applied to any use.

DESCRIPTION OF SYMBOLS 1 Molded body 2 Droplet 3 Evaluation apparatus 4 Injection part 5 Toilet seat 6 Adhering droplet 7 Molded body 8 units 9 Weight 10 Cylindrical guide 11 Cushion material 12 Toilet device 13 Toilet seat 14 Main body 15 Toilet 16 Toilet lid 17 Cleaning nozzle 18 Operation part 19 Body case

Claims (10)

A molded body containing a base resin and an additive having a melting point lower than the melting point of the base resin and solid at room temperature, having a surface roughness Sa of 300 nm or less and a drop angle of droplets on the surface of 90. Molded body that is below °. The molded body according to claim 1, wherein the sliding angle is 45 ° or less. The molded article according to claim 1 or 2, wherein the additive is a lubricant. The molded article according to any one of claims 1 to 3, wherein the additive is a hydrocarbon-based additive. The molded body according to any one of claims 1 to 4, wherein the base resin is polypropylene. The molded body according to any one of claims 1 to 5, wherein the molded body contains an inorganic additive. The molded article according to any one of claims 1 to 6, wherein the molded article contains an antibacterial agent. The household appliances using the molded object as described in any one of Claims 1-7. The member for toilets using the molded object as described in any one of the said Claims 1-7. The toilet member according to claim 9, wherein the toilet member is a toilet seat or a main body case.