JPH1086148A - Method for blending granular silicon compound and compound thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the characteristics of a silicon compound be demonstrated effectively from various molded moldings by dispersion-mixing a silicon compound of a specified particle size, or a filler, a reinforcing material, or an antibacterial material which contains the silicon compound as a main component with a synthetic resin simply and homogeniously. SOLUTION: Since even a silicon compound which has the shape of powder and granular material the particle size of which is 20μm or less and is made from minerals or even a substance containing the silicon compound as a main component has siloxane linkages of a high adsorption bonding property in the main chain and is mixed with silicone oil which is 1-10 times as heavy as the silicon compound, etc., the silicon compound or the substance containing the silicon compound as a main component is dispersed simply and homogeneously and adsorption-bonded, and the mixed and dispersed silicone oil is blended and kneaded with a desired synthetic resin in an appropriate ratio. In this way, since the silicone oil demonstrates the adsorption-bonding property further between it and the synthetic resin, the silicon compound or the substance containing the silicon compound as a main component is dispersed homogeneously with the synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compounding method for homogeneously dispersing and mixing a powdery silicon compound compounded in a synthetic resin raw material in order to maintain toughness, impact resistance or antibacterial property in a synthetic resin molded product. It relates to the compounding raw material.

[0002]

2. Description of the Related Art In a molded article such as a polyethylene resin or a polypropylene resin, talc Mg ₃ (Si ₄ O ₁₀ ) (O 2) is used in order to enhance the toughness and impact resistance of the molded article.
H ₂ ) and muscovite KAl ₂ (SiAlO ₁₀ ) (O
H) ₂ , diatomaceous earth SiO ₂ · H ₂ O, or anhydrous silicate Si
It is well known that a so-called powdery silicon compound such as O ₂ is compounded as a filler or a reinforcing material. However, when such an inorganic filler or reinforcing material is blended with an organic material such as a synthetic resin raw material, formation of a molded article having uniform physical properties is extremely difficult because of poor mutual dispersibility.

[0003] In recent years, due to the remarkable increase in health-oriented, antibacterial properties and dustproof properties have been strongly required for various synthetic resin molded articles. It has been practiced to mix an antibacterial agent having a fungicidal property, for example, a benzimidazole compound, a carbamate compound or a pyridine compound into a synthetic resin material to cope with antibacterial activity. Is to volatilize or elute the drug killing component of the chemical agent to kill the drug, and the synthetic resin material has high hydrophobicity and the drug killing component of the chemical agent mixed therein is difficult to volatilize or elute, so that a large amount is mixed. In addition, practical antibacterial properties are hardly exhibited, and furthermore, if voluntary volatilization or elution is performed, there is a high risk of health due to the drug killing component, Antimicrobial with the active related products and totally Thus can not be used for particular food-related products such as also volatilization and elution are also suffer problems that are loss when short.

Under such circumstances, the inventors have conducted intensive research and have found that antimicrobial ceramic powder which is harmless to health, has excellent antibacterial action, and can exhibit antibacterial properties over a long period of time by radiating electromagnetic waves in a specific wavelength region. Has already been developed and
No. 2,746,38 discloses the contents.

However, the antibacterial ceramic powder is also composed mainly of a so-called silicon compound composed of silicon oxide (SiO ₂ ) as its main component, and therefore, when it is mixed with a synthetic resin material to form a product, it is still required. Dispersibility is poor, and therefore, there is a problem that uniform antibacterial action cannot be exerted over the entire product. Further, the filler, reinforcing material or antibacterial material containing the silicon compound or the silicon compound as a main component is desired to be as fine as possible in order to more effectively exhibit the properties held by the molded product. If the particle size is 20 μm or less, not only will it scatter violently during compounding, but the physical hygroscopicity associated with the fine particles will increase significantly, so that a slight amount of moisture will cause blocking, which will cause significant problems in the compounding operation. Occurs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to provide a silicon compound having a particle size of 20 μm or less, a filler containing a silicon compound as a main component, a reinforcing material, or an antibacterial material. The compounding direction of the powdery silicon compound and its compounding raw material are simply and homogeneously dispersed and mixed with the synthetic resin material so that the characteristics of the silicon compound can be effectively exhibited from various molded products. To provide.

[0007]

The technical means adopted by the present invention to solve the above-mentioned problem is that the particle size is 20 μm.
m or less of a particulate silicon compound or a filler, a reinforcing material, an antibacterial material, or the like containing silicon compound as a main component is mixed and dispersed in silicone oil having a weight ratio of 1 to 3 times, and adsorbed and bonded. By mixing and kneading the dispersed silicone oil with a desired synthetic resin material at an appropriate ratio, the silicone oil and the synthetic resin material are uniformly dispersed in the synthetic resin material with the adsorptive bonding property. It depends on the compounding method and the composition of the synthetic resin compounding raw material.

[0008]

The technical means of the present invention has the following functions. That is, even a powdery and inorganic silicon compound having a particle size of 20 μm or less, or a substance containing a silicon compound as a main component, has a siloxane bond having a high adsorptivity in the main chain and a weight ratio of the silicon compound or the like of from 1 to The silicon compound or the substance containing the silicon compound as a main component is easily and homogeneously dispersed and adsorbed and bonded to be mixed with a 10-fold weight of silicone oil. By mixing and kneading the resin material in an appropriate ratio, the silicone oil exhibits a further adsorptive binding property with the synthetic resin material, so that the silicon compound or a substance containing the silicon compound as a main component is uniformly dispersed in the synthetic resin material. Will be done. Since the silicone oil is a viscous liquid, the silicon compound or the substance containing the silicon compound as a main component mixed in the silicone oil has no danger of scattering and can be easily compounded because it is liquid. Become.

[0009]

The present invention will be described in more detail with reference to the following examples. The term "particulate silicon compound" as used in the present invention means that the compound is formed into fine powder particles having a maximum particle size of 20 μm or less. Is talc Mg ₃ (Si ₄ O ₁₀ ) (OH) which is used as a so-called filler or reinforcing material compounded for improving the impact resistance and toughness of a molded product made of a polyethylene resin, a polypropylene resin or an ABS resin material. ₂ , diatomaceous earth SiO ₂ · H ₂ O, kaolinite Al ₂ Si ₂ O ₅ (O
H) ₄ , silicic anhydride SiO ₂ , muscovite KAl ₂ (Si ₃ A
lO ₁₀ ) (OH) ₂ or zeolite (general formula Wm
ZnO ₂ n · SH ₂ O, where W = Na, Ca, K, Z =
(Si + Al, S = unspecified). Specific examples containing a silicon compound as a main component are described in Japanese Patent Application No. 7-274638.
As disclosed in US Pat. No. 6,075,086, 30 to 50% by weight of silicon oxide, 15 to 25% by weight of alumina oxide, 7 to 15% by weight of manganese oxide and zinc oxide, 2 to 5% by weight of titanium oxide, and 0.1 to 25% by weight of silver or copper. An antibacterial ceramic powder fired at a ratio of 1% by weight is exemplified.

Although the silicon compound or the filler, reinforcing material or antibacterial material containing the silicon compound as a main component is inorganic, the synthetic resin material is organic and has a large difference in specific gravity. However, it is not possible to achieve mutual uniform dispersion throughout the entire structure. Therefore, it has a high adsorptive binding property to inorganic substances, especially to silicon compounds, and also to organic substances, and it is a liquid that easily dilutes and disperses powdery silicon compounds etc. Silicone oil is selected as a material having a high viscosity, and a powdery silicon compound or the like is mixed with the silicone oil in a weight ratio of 1 to 3 times by weight to achieve the adsorption bonding with the silicone oil and Disperse in silicone oil.

In such a case, the silicone oil used is preferably one having a low polymerization degree of dimethyldichlorosilane, and has a viscosity of about 3 to 200 at room temperature.
A polymer having a degree of polymerization of about cp (centipoise) is desired.

[0012] Further, in the case of a silicon compound or a filler or a reinforcing material containing a silicon compound as a main component, it is usually 1: 1 with respect to synthetic resin material.
About 5 to 15% by weight is used, and 0.1 to 5.0% by weight is usually used for an antibacterial material.
If the dilution ratio with respect to the silicone oil is increased, a large amount of the silicone oil will be blended into the synthetic resin material, and there is a risk of changing the basic physical properties of the molded product. Therefore, it is important to keep the weight ratio within 1 to 3 times at most. is there.

The synthetic resin materials used in the present invention include polyolefin resins such as polyethylene and polypropylene, thermoplastic resins such as polystyrene resin and polyvinyl chloride resin, and thermosetting resins such as polyamide resin and polyester resin. Further, copolymer resins such as ABS resin can be used, and it can be used over all synthetic resin materials whose substantial processing temperature is lower than the thermal decomposition temperature of silicone oil.

The synthetic resin material selected to form a desired molded product may be obtained by adding a silicon compound or a powdery or granular filler containing a silicon compound as a main component, a reinforcing material, or an antibacterial material together with a coloring agent or a stabilizer. Is mixed and dispersed appropriately and then kneaded with a ribbon blender or Henschel mixer used as a general kneading machine, so that the synthetic resin compounding material is uniformly dispersed and compounded throughout the entire synthetic resin material. Is created.

In such a case, in the case of a silicon compound or a filler or a reinforcing material containing a silicon compound as a main component, it is usually blended at about 1.5 to 15% by weight with respect to the synthetic resin material. When a large amount of silicone oil is blended in a vinyl resin, a polystyrene resin, or an ABS resin, internal plasticization is large and basic physical properties are impaired. Therefore, when the synthetic resin material is used, the amount of the silicone oil itself is also reduced. It should be limited to a maximum of 20% weight or less.

The dispersibility of the antibacterial ceramic powder in the polyethylene film formed by the compounding method of the present invention and the polyethylene film formed by the conventional compounding method using the antibacterial ceramic powder containing a silicon compound as a main component will be described below. The antibacterial property of the film exhibited by the antibacterial ceramic powder was measured and measured. The antibacterial film material used for the measurement of dispersibility was a low-density polyethylene film grade resin whose composition was 52% by weight of silicon oxide, 22% by weight of alumina oxide, and 12% by weight of titanium oxide.
% Of antibacterial ceramic powder having an average particle size of 1.2 μm, which is baked at 7% by weight of manganese oxide and zinc oxide, is 1% by weight of polyethylene resin and has a viscosity of 7.5 cp at room temperature. An antibacterial film formed by mixing and dispersing 3% by weight of silicone oil with respect to the polyethylene resin, mixing and kneading the mixed and dispersed silicone oil with the polyethylene resin, and forming the film to a thickness of 40 μm and a width of 210 cm by inflation molding. A material and a polyethylene resin were mixed and kneaded with the above antibacterial ceramic powder at 1% by weight, and an antibacterial film material formed in the same manner was used as a control film material.

For measurement of dispersibility, 50 × 20 cm measurement film pieces were randomly sampled from 50 m each of the antibacterial film material and the control film material. Escherichia coli (Escherichia)
Coli) as a test bacterium, and this was incubated at 35 ° C. in an NB medium.
A culture solution of the test bacteria cultured with shaking for 16 to 20 hours was diluted with the same medium so that the number of bacteria was approximately 10 ⁶ / ml, and then diluted 1000-fold with a sterilized phosphate buffer, and used as a bacterial solution.

For the measurement of the antibacterial activity, 0.5 ml of bacterial solution was applied to one surface of each of 50 antibacterial film pieces and a control film piece.
Was dropped, and a sterilized polyethylene film was adhered thereon, and this was stored at 35 ° C., and the number of viable bacteria after 1 hour was measured to check the distribution of viable bacteria. The results are shown in Table 1. there were.

[0019]

[Table 1]

For the determination of the viable cell count, each of the film pieces was washed with 10 ml of SCDLP medium (Nihon Pharmaceutical), and the washed liquid was subjected to a pour plate culture method (cultured at 35 ° C. for 48 hours) using an SA medium. The number of bacteria was measured and converted per piece of film. As is clear from Table 1, the antibacterial film material formed according to the compounding direction of the present invention has a remarkably narrow distribution of the number of viable bacteria, and has an antibacterial ceramic powder. This is considered to be a result of being uniformly dispersed throughout the film material.

[0021]

As described above, the present invention relates to a silicon compound having an inorganic particle diameter of 20 μm or less, a filler, a reinforcing material, or an antibacterial ceramic powder having a particle size of 20 μm or less. The mixture is once dispersed and diluted with a silicone oil having a siloxane bond in the main chain having a viscosity of about 3 to 200 cp at a normal temperature at a weight ratio of 3 times,
Since the mixed and dispersed and diluted silicone oil is mixed and kneaded in an appropriate ratio to the synthetic resin material, blocking is prevented and the silicon compound or the like and the synthetic resin have an adsorptive bond due to the high adsorptivity of the silicone oil. In addition to being enhanced, the difference in specific gravity is also buffered due to the viscosity of the silicone oil, so that the dispersibility is extremely good and uniform, so that the properties of the silicon compound and the like can be uniformly exhibited throughout the molded article. . Further, since the silicon compound and the like in the form of powder are mixed and dispersed in the silicone oil, they do not scatter even during compounding and kneading, and since they are liquid, the compounding and kneading operation can be carried out extremely easily, and the kneading properties are remarkably improved. Silicone oil not only retains adsorptive bonding with a wide range of synthetic resin materials, but also retains heat resistance enough to withstand the molding process of these synthetic resin materials. It can be said that it is a compounding method and a compounding raw material of the silicon compound.

Claims (3)

[Claims] Claims 1. A powdery silicon compound is mixed in an appropriate ratio with an appropriate synthetic resin raw material in an appropriate ratio to prepare a compounded raw material for producing a synthetic resin molded product having desired characteristics, and the particle size thereof is 20 μm or less. Is dispersed and mixed in a silicone oil having a weight ratio of 1 to 3 times in weight ratio, and the silicone oil in which the particulate silicon compound is dispersed and mixed is appropriately mixed with a synthetic resin raw material. A compounding method of a powdery silicon compound, which is characterized by kneading. 2. The compounding method according to claim 1, wherein the particulate silicon compound comprises a composition containing a silicon compound as a main component. 3. A synthetic resin blending raw material which is blended by the blending method according to claim 1 or 2.