JP3059816B2 - Anti-scale adhesive polypropylene resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin resin composition and, more particularly, to a molded product having antibacterial adhesion, antibacterial property, antistatic property and surface modification property by retaining three points.

[0002]

2. Description of the Related Art Conventionally, techniques for improving the antifouling performance of a polyolefin resin composition include preventing the adhesion of dust by adding an antistatic agent, preventing the growth of microorganisms such as fungi and bacteria by adding an antibacterial agent, or adding silicones. They are selectively used for the purpose of improving the water repellency and the releasability, and they have been used in practice. However, despite the fact that there are many requests for improvement regarding the prevention of scale adhesion, the reality is that it has not been solved.

[0003]

SUMMARY OF THE INVENTION The present inventors have continued their studies focusing on the adhesion of scale, etc., which has not been solved with existing polyolefin molded products. 3 of inhibitor and surface modifier
It has been found that the above problems can be solved by blending the points), and the object of the present invention is to achieve a polyolefin resin having a scale adhesion preventing property which has not existed so far. To provide a molded article.

[0004]

An object of the present invention is to provide a polyolefin resin composition comprising a polyolefin resin, an antibacterial agent, an antistatic agent and a surface modifier, wherein the polyolefin resin is a polypropylene resin. Wherein the antibacterial agent, antistatic agent and surface modifier are (a)
0.1 to 5.0 parts by weight of an antibacterial agent, (b) 0.2 to 7.0
Parts by weight of an antistatic agent, (c) 0.2 to 4.0 parts by weight of a surface modifying agent, wherein the antibacterial agent contains silver, copper,
One or two or more metals selected from zinc are held in a porous zeolite in an ionic state, and the antistatic agent is any of glycerin fatty acid ester or sorbitan fatty acid ester, This is achieved by a descaling-preventing polypropylene resin composition characterized in that the surface modifier is either polytetrafluoroethylene or an organopolysiloxane.

Hereinafter, the present invention will be described in detail. The polyolefin resin used according to the present invention refers to a polypropylene resin. Polypropylene is not limited to a homopolymer, and a random or block copolymer can also be used. The descaling-preventing molded article of the present invention contains an antibacterial agent, an antistatic agent, and a surface modifier in the following proportions. (A) 0.1 to 5.0 parts by weight of an antibacterial agent (b) 0.2 to 7.0 parts by weight of an antistatic agent (c) 0.2 to 4.0 parts by weight of a surface modifier In (a), as the antibacterial agent, from the viewpoint of antibacterial properties when blended with polyolefin, it is preferable to use an inorganic type such as zeolite containing a metal having a bactericidal action, and particularly from silver, copper and zinc. A porous zeolite in which one or more selected metals are held in an ionic state is used. As the zeolite suitable for the holding base of the antibacterial agent, a porous zeolite having an ion exchange capacity of 1 meq / g (anhydrous basis) or more and having a large specific surface area is preferable. Y-type zeolite, synthetic mordenite, and the like are preferable. On the other hand, as the natural zeolite, mordenite, clobtyrolite, chabazite and the like are preferable. Further, since it is contained in the polyolefin resin, a powdery product having a particle size as small as possible is preferable, and an active zeolite powder having an average particle size of 15 μm or less is particularly suitable for uniform dispersion. The above powder should be 2
The one with less secondary aggregation is better.

[0006] By using zeolite having such properties, one or more holding amounts of the antibacterial metal ions are arbitrarily adjusted by an ion exchange method to prepare an antibacterial agent having a desired antibacterial property. Can be. The compounding amount of the metal having a bactericidal property is preferably 0.005% by weight to a saturated amount based on the whole antibacterial agent. Here, the saturation amount is
It is the saturation value of the ion exchange amount of the zeolite used. A more preferred metal loading is 0.1-5.0% by weight. The water content is preferably activated by heating, and the water content is preferably 5% by weight or less. The content of the antibacterial agent used in the present invention is preferably 0.1 to 5.0 parts by weight based on 100 parts by weight of the polyolefin resin.

[0007] (b) As the antistatic agent, a nonionic one is preferred, and glycerin fatty acid esters and sorbitan fatty acid esters are used. The content of the antistatic agent is preferably 0.2 to 100 parts by weight of the polyolefin resin.
1.0 part by weight.

(C) As the surface modifier, polytetrafluoroethylene or organopolysiloxane is used. The content of the surface modifier is preferably 0.2 to 4.0 parts by weight based on 100 parts by weight of the polyolefin resin. To add the antibacterial agent, antistatic agent and surface modifier to the polyolefin resin, first knead and granulate the antibacterial agent, antistatic agent and surface modifier in a high concentration using an extruder, and then premix. And a method of forming a molded article with an injection molding machine is appropriate. Among them, the antimicrobial agent, antistatic agent, and surface modifier are added and the amount added, but if only one type or two types is used, the effect of preventing the adhesion of descaling is not exhibited, and three types must be mixed. Thus, the effect of preventing scale adhesion is exhibited for the first time. The addition amount is preferably within the above-mentioned range, and even if it exceeds that, it is difficult to obtain an effect corresponding thereto. Generally, most of the descaling components are proteins and dust, and proteins are charged and also provide nutrients to microorganisms. In order to prevent such adhesion, an antibacterial agent and an antistatic agent are blended. However, since a phenomenon occurs via water, a hydrophilic antistatic agent cannot completely solve the problem. Therefore, in the present invention, by adding another type of surface modifier to these two types, the surface adhesion ratio to water was reduced. Therefore, by mixing these three types at a specific ratio, water hardly adheres to the surface, and even if only the protein adheres, the decomposition of the protein component by microorganisms does not occur, and the surface adheres as descaling. There is no. For this reason,
It has a high commercial value like never before.

[0009]

The anti-adhesion property of the molded article having anti-descaling properties will be described below with reference to Examples and Comparative Examples. "Examples 1 to 8, Comparative Examples 1 to 7" Homopolypropylene (HPP), propylene-ethylene block copolymer (BPP), propylene-ethylene random copolymer (RPP), high density manufactured using a Ziegler catalyst As shown in Table 1, an antibacterial agent, an antistatic agent, and a surface modifier were added to polyethylene (HDPE) and a low-density polyethylene (LDPE) produced by a high-pressure method using a Philips catalyst at a high concentration, as shown in Table 1. The extruded pellets were blended at a bulk concentration of 20% by weight), premixed, and mixed at an injection temperature of 220 ° C. to 240 ° C. with an 8 oz. Injection molding machine manufactured by Sumitomo Heavy Industries, Ltd.
After forming into a test piece of 00 mm x 50 mm x 2 mm, this test piece was fixed by dipping in the upper part of the bathtub, and the bathtub was used for 6 months as usual, and the bathtub was cleaned as usual. Table 2 shows the results.

[0010]

[Table 1]

[0011]

[Table 2]

The additives used in Examples and Comparative Examples are as follows. (1) antibacterial agent K: Ag, Zn ion containing antibacterial agent Bakutekira (2) antistatic agent T _1: Glycerin fatty acid ester T _2: sorbitan fatty acid ester (3) surface modifier H _1: Organopolysiloxane H _2: Poly Tetrafluoroethylene The results were evaluated according to the following criteria and are summarized in Table 2. ◎: Good (no scales attached) ○: Possible (scales can be removed by cleaning etc.) ×: Not possible (scales cannot be removed even after cleaning)

[0013]

The scale-preventing molded article of the present invention has reached a sufficiently satisfactory level of scale adhesion or scale removal, which has not yet been solved. The molded product having the descaling prevention property having such characteristics is suitable for bath utensils and the like.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI (C08L 23/10 83:04) (72) Inventor Masahiro Matsui 1-4-19 Minamimoricho, Kita-ku, Osaka-shi Kanebo Kasei Stock In-house examiner Shoko Mitani (56) References JP-A-4-77538 (JP, A) JP-A-2-255847 (JP, A) JP-A-4-55491 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08L 23/10 C08L 27/18 C08L 83/04 C08K 3/34 C08K 5/103

Claims (1)

(57) [Claims] 1. A polyolefin resin composition comprising a polyolefin resin, an antibacterial agent, an antistatic agent and a surface modifier, wherein the polyolefin resin is a polypropylene resin, (A) 0.1 to 5.0 parts by weight of an antibacterial agent; (b) 0.2 to 7.0 parts by weight of an antistatic agent; (c) 0.2 to 4.0 parts by weight. Part of the surface modifier, wherein the antibacterial agent is one or two selected from silver, copper, and zinc.
At least one kind of metal is held in a porous zeolite in an ionic state, wherein the antistatic agent is any of glycerin fatty acid ester or sorbitan fatty acid ester, and the surface modifier is polytetrafluorocarbon. A descaling-preventing polypropylene resin composition, which is either ethylene or an organopolysiloxane.