JP3515222B2 - Antibacterial masterbatch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a highly versatile and widely used polyethylene or polypropylene resin or a polyvinyl chloride resin which can be easily dispersed and mixed. The present invention relates to an antibacterial masterbatch for keeping an antibacterial property in a molded product. 2. Description of the Related Art Polyethylene and polypropylene resin materials are inexpensive, lightweight and excellent in moldability, and polyvinyl chloride resin materials are inexpensive and have water resistance, weather resistance and chemical resistance. Because it is also excellent in secondary workability such as printing and bonding, it is used in a large amount in various industrial material products and living material products. In recent years, however, a large amount of industrial smoke and drainage due to remarkable economic development, a large amount of exhaust gas accompanying the socialization of vehicles, a large intake of additives due to a flood of processed foods, etc. On the other hand, with the advent of an aging society, a declining population, and the spread of medical knowledge associated with the computerization, health-oriented and environmental-healthy orientations are increasing abundantly. [0004] Therefore, it is particularly safe for packaging bags and film materials for fresh foods and processed foods made of polyethylene or polypropylene resin materials, and for interior materials such as water suction and drain pipes made of polyvinyl chloride resin materials, wall materials, floor materials, and the like. As well as hygiene, so-called antibacterial properties have been strongly demanded. In view of such circumstances, it is necessary to add a pyridine compound and an imidazole compound to a polyvinyl chloride resin to prevent bacteria and fungi from adhering and growing, thereby providing a hygienic film or sheet. Is actually Kaihei 7-99
No. 52 or Japanese Utility Model Laid-Open No. 7-9996. However, pyridine-based compounds and imidazole-based compounds, which are called antibacterial agents, are not particularly compatible with polyvinyl chloride resins, and their addition amounts are small. In addition to the fact that the dispersion is not evenly distributed over the whole, the antibacterial agent itself is highly toxic and two kinds of these highly toxic antibacterial agents are blended at the time of molding. You. Furthermore, since the antibacterial action of the antibacterial agent is exerted when the antibacterial component elutes or volatilizes and comes into contact with bacteria and fungi, it is sufficient to simply blend the antibacterial component into an extremely hydrophobic polyvinyl chloride resin. No antibacterial effect can be expected, and none of polyethylene and polypropylene resin products yet can be expected to have a sufficient antibacterial effect has been developed. SUMMARY OF THE INVENTION [0007] The present invention has been made to solve the above problems, and has an antibacterial property which is relatively safe to use and has antibacterial properties against bacteria and fungi. The dispersing agent is capable of dispersing the agent uniformly over the entire molded product made of polyethylene, polypropylene resin or polyvinyl chloride resin, and the migrating property of dissolving or volatilizing the dispersed antibacterial component on the outer surface of the molded product. An object of the present invention is to provide an antibacterial masterbatch that can be applied. [0008] In order to solve the above-mentioned problems, the technical means used by the present invention is tetrachloroisophthalonitrile, which has an antibacterial effect on both bacteria and fungi. In order to enhance the dispersion by melting efficiently in a short time, it is crushed into a fine powder of 80 mesh or more and retains 30 to 50% by weight of the powder and compatibility and migration with polyethylene or polypropylene resin. A dispersion antibacterial material having a composition of 50 to 70% by weight of polyethylene wax is blended in a ratio of 2 to 13% by weight with respect to a base material made of polyethylene or polypropylene resin, and is melt-kneaded to a required diameter and length. In the antimicrobial masterbatch of the given composition. Furthermore, tetrachloroisophthalonitrile crushed into a fine powder of 80 mesh or more has a particle size of 30 to 5%.
0% by weight, 45-60% by weight of metal stearate soap for enhancing dispersion of the tetrachloroisophthalonitrile upon melting, and a semi-dry vegetable oil having compatibility and migration with polyvinyl chloride resin Is 5 to 10
% Of the antibacterial material having a composition of 2% by weight is blended with 2 to 13% by weight of the base material in which the required amount of the antibacterial agent and the stabilizer are blended with the polyvinyl chloride resin and melt-kneaded to obtain the required diameter and length. The antibacterial masterbatch of the configuration thus formed is present. The technical means of the present invention has the following functions. That is, polyethylene or polypropylene resin is 8
30% to 50% by weight of tetrachloroisophthalonitrile crushed into a fine powder of 80 mesh or more and 50% of polyethylene wax to 7% to 98% by weight.
The antibacterial material composed of 2 to 13% by weight is blended and melt-kneaded in a proportion of 2 to 13%, so that tetrachloroisophthalonitrile can be efficiently melted by short-time heating and melting of polyethylene wax. The presence creates a masterbatch in which the melted antimicrobial components are homogeneously dispersed. [0011] The master batch is made of a basic material made of polyethylene resin or polypropylene resin.
Since it is composed of 5 to 95% by weight, it is easily compatible and mixed and dispersed even when a desired molded product is formed by mixing an appropriate amount with a polyethylene resin or a polypropylene resin, and the entire molded product is dispersed. As a result, the antibacterial component is homogeneously dispersed and the antibacterial component dispersed inside the molded product is also gradually transferred to the outer surface of the molded product and eluted or volatilized with the migration of the polyethylene wax. Further, based on a base material made of polyvinyl chloride resin having a weight ratio of 87 to 98%, tetrachloroisophthalonitrile crushed into a fine powder of 80 mesh or more has a weight ratio of 30 to 50%, and stearic acid. Dispersed antibacterial material composed of 45 to 60% by weight of metal soap and 5 to 10% by weight of plant semi-drying oil is blended at 2 to 13% by weight and melt-kneaded. The ingredients are dispersed homogeneously with the metallic soap of stearic acid to create a masterbatch. Since the masterbatch is composed of 87 to 98% by weight of a base material in which a required amount of a plasticizer and a stabilizer are mixed with a polyvinyl chloride resin, the required amount is mixed with the polyvinyl chloride resin. Even when a desired molded product is formed, it is easily compatible and mixed and dispersed, the antimicrobial component is uniformly dispersed throughout the molded product, and the semi-dry vegetable oil can migrate in the polyvinyl chloride resin, With the transfer of the semi-dry vegetable oil, the antibacterial component is also gradually eluted or volatilized on the outer surface of the molded product. Embodiments of the present invention will be described below in detail.
The present invention is intended to be blended with a polyethylene resin or a polypropylene resin, or blended with a polyvinyl chloride resin so that the molded product exhibits antibacterial properties against bacteria and microbes. One reason is that they have compatibility with molding materials such as polyethylene resin, polypropylene resin and polyvinyl chloride resin and are sufficiently mixed and dispersed. [0015] For this reason, polyethylene resin is blended with polyethylene resin, and polypropylene resin blended with polypropylene resin is blended with polypropylene resin. In such a case, the ratio of the base cord material is desirably at least 87% by weight or more, particularly from 95% to 98% in order to enhance the mixing and dispersibility.
%. The basic cord thus obtained has an antibacterial component for maintaining antibacterial properties in various products to be formed, and the antibacterial component is dispersed throughout the various products to be formed, and the product is transferred by migration. Dispersion antibacterial material consisting of a composition with a dispersion transfer component that elutes or volatilizes the antibacterial component on the outer surface,
It is blended in a weight ratio of 2 to 13% and then melt-kneaded. Tetrachloroisophthalonitrile is selected as the antibacterial component constituting the dispersed antibacterial material. This is because benzimidazole compounds, carbamate compounds, and pyridine are used as antibacterial agents for bacteria and fungi. Although a very wide variety of compounds such as glycerin compounds and guanidine derivatives are currently used, these antibacterial agents have high selectivity to bacteria and fungi, and are therefore expected to have antibacterial properties over both bacteria and fungi. It is necessary to use at least two or more antibacterial agents in combination, and these antibacterial agents and the like are highly toxic and have many problems in handling. In view of the above, the inventors of the present invention have investigated the antibacterial properties of typical types of bacteria and fungi that cause practical contamination and fouling of various molded products using tetrachlorophthalonitrile. The minimum growth inhibitory concentration was examined using the so-called MIC value.
It was confirmed that even at 0 ppm and fungi, the antibacterial effect can be achieved at a concentration of about 250 to 800 ppm. Therefore, it was found that the antibacterial effect between bacteria and fungi could be achieved by determining the actual concentration according to the intended use. . [Table 1] The tetrachloroisophthalonitrile has a white crystalline form at room temperature, and has a melting point of 250 to 251 ° C. On the other hand, the processing temperature of polyethylene resin is approximately 160 to 300 ° C,
In the case of a polypropylene resin, the temperature is about 200 to 300 ° C., and the tetrachloroisophthalonitrile is melted at a melting and kneading temperature at the time of forming a master batch. Since the heat history of 251 ° C. or higher, the so-called heat receiving time, is extremely short, it is desired to increase the surface area ratio in order to efficiently receive and melt the heat within the short time. Therefore, it is desirable to use the tetrachloroisophthalonitrile at least. It is necessary to crush into a fine powder of 80 mesh or more, preferably 120 to 150 mesh or more. The other dispersion-transferring component constituting the dispersed antibacterial material is compatible with polyethylene resin and polypropylene resin, and can migrate inside the polyethylene resin or polypropylene resin to form a molten antibacterial component. Polyethylene wax is selected because it is required to have a property of dispersing the dispersed antibacterial component homogeneously throughout the product to be formed and to gradually elute or volatilize the dispersed antibacterial component on the outer surface of the molded product. The polyethylene wax preferably has a molecular weight of about 1,000 to 8,000, and particularly has a molecular weight of about 1,000 to 8,000 in the case of strongly exhibiting migratory properties or in the case of using a flexible material such as low-density polyethylene as a molding material used in product molding. When using a high-density polyethylene or polypropylene resin material, the molecular weight is about 4000 to 8000.
A degree is preferable from the viewpoint of dispersibility. Since the dispersion-transporting component disperses the antibacterial component incorporated in a trace amount uniformly throughout the entire molded product, the composition ratio of the dispersed antibacterial material is at least equal to the weight ratio of the antibacterial component. More preferably, the weight ratio is about 1.5 to 2.3 times. The present invention provides an antibacterial masterbatch for maintaining antibacterial properties in a molded product. Usually, a pigment masterbatch is formed by performing a sufficient dispersion process on a pigment. A dilution ratio of about 2 to 40 times is used. However, since the antibacterial component in the present invention is not particularly excellent in dispersibility, a so-called dilution ratio in which a large amount of a basic material compatible with the molding resin material is used is used. It is expedient to keep at most 5 to 15 times. As a result, the antibacterial component consisting of tetrachloroisophthalonitrile can be antibacterial at a concentration of 300 ppm for bacteria and 800 ppm for fungi. About 2500pp
A concentration of the order of 0.2 m is required. Therefore, when the dilution ratio is 5 times, the antibacterial component is 1.25% by weight, the dispersion transfer component is 0.5 to 2.9% by weight, and the basic material 9 is used.
The composition ratio is 5.9 to 97.5% by weight, and when the dilution ratio is 15 times, the antibacterial component is 3.8% by weight, the dispersion transfer component is 3.8 to 8.7% by weight, and the basic material 8 is used.
The weight ratio is 7.5 to 92.3%. On the other hand, when the molding resin material is a polyvinyl chloride resin, the composition is different from that of the polyethylene or polypropylene resin material because the polyvinyl chloride resin is inferior in heat stability and heat fluidity. As the component, tetrachloroisophthalonitrile crushed into a fine powder of 80 mesh or more is used, and the antibacterial component is uniformly dispersed in a molded product, and the heat of a polyvinyl chloride resin as a molding resin material is controlled. Metallic thiaphosphate is selected as a dispersing component for increasing the stability. Specific examples of the metal soap stearate include magnesium stearate, aluminum stearate, calcium stearate, barium stearate and zinc stearate. Further, a semi-dry vegetable oil is used as a transfer component for gradually transferring the antimicrobial component dispersed throughout the molded product to the outer surface of the product and dissolving or volatilizing the antimicrobial component. Specific examples of the plant semi-dry oil include soybean oil and rapeseed oil. A dispersing antibacterial material is composed of such an antibacterial component, a dispersing component, and a migrating component. The composition ratio of these components is approximately 2500 ppm in consideration of the safety of the antibacterial component during use. Although 0.25% by weight is required, due to the excellent dispersibility of metal stearic acid soap, the dispersing component is about 1.5 to 2 times the so-called 0.38 to 0.5% by weight of the antibacterial component. The weight ratio of the migrating component is preferably about 0.16 to 0.33 times the so-called 0.04 to 0.08% by weight of the antibacterial component. Since the base material made of polyvinyl chloride resin to which such a dispersing antibacterial material is blended and melt-kneaded is inferior in heat stability and heat fluidity, a stabilizer and a plasticizer are blended in an appropriate ratio in advance. Basic materials are used.
There are no particular restrictions on the stabilizers and plasticizers used in such a case. Metallic soaps such as lauric acid and stearic acid are used as stabilizers, and phthalic acid-based DBP and DO are used as plasticizers.
P, phosphoric acid-based TCP, TOP and the like are usually used. The heating conditions when a required ratio of the dispersing antibacterial material is blended with such a base material made of polyethylene or polypropylene resin or a base material made of polyvinyl chloride resin and melt-kneaded are, of course, tetrachloroisophthalo. Care is taken to allow the nitrile to melt. According to the technical means of the present invention, the following specific effects are exhibited. That is, when polyethylene or polypropylene resin is used as the molding material, the base material composed of polyethylene or polypropylene resin compatible with the molding material occupies 87 to 98% by weight. Since the polyethylene wax compatible with the material is blended in a weight ratio of 1.0 to 2.3 times the weight ratio of the antibacterial component, the antibacterial component is uniformly dispersed throughout the molded product. At the same time, the dispersed antibacterial component is gradually transferred to the outer surface of the molded product together with the migrating polyethylene wax and eluted or volatilized, so that the entire molded product exerts the antibacterial property evenly, and the Real concentration of antibacterial component consisting of isophthalonitrile is 2500 ppm
As a result, excellent antibacterial properties are exhibited over a long period of time, not only for bacteria but also for fungi. Further, even when the polyvinyl chloride resin is a molding material, a base material in which a required ratio of a stabilizer and a plasticizer is previously blended with the polyvinyl chloride resin compatible with the molding material is 87 to 98% by weight. The dispersed antimicrobial material occupying 2 to 13% by weight of the antibacterial material is composed of tetrachloroisophthalonitrile, which has antibacterial properties against bacteria and fungi, and is 30 to 50% by weight. The antimicrobial component is blended so as to be dispersed at a concentration three times as high as that of the antimicrobial component. Further, the dispersing component composed of metallic stearic acid soap for dispersing the antimicrobial component throughout the molded product is 45 to 60% by weight based on the weight of the so-called antimicrobial component. Since the antibacterial component is blended at a weight ratio of 0.9 to 2 times, the antibacterial component is uniformly dispersed throughout the molded product, and the antibacterial effect is exerted evenly, and the dispersed component also exerts a heat stabilizing effect. Thermal stability of basic materials also increased Silurian properly. In addition, since the composition has a composition in which 5 to 10% by weight of a plant semi-drying oil having a migration property to a molding material or a base material is blended, an antibacterial component dispersed throughout the entire product gradually becomes outside the molded product. It can be said that the antibacterial masterbatch has extremely many features such as being transferred to the surface, being dissolved or volatilized, and exhibiting antibacterial properties over a long period of time.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08J 3/22 C08L 1/00-101/16

Claims (1)

(57) [Claim 1] 30 to 50% by weight of tetrachloroisophthalonitrile crushed into a fine powder having a size of 80 mesh or more, 45 to 60% by weight of metal thaliaphosphate, and plant half The dispersing antibacterial material having a composition of 5 to 10% by weight of the drying oil is used in an amount of 2 to 13% based on the base material in which the required ratio of the plasticizer and the stabilizer is blended with the polyvinyl chloride resin.
An antibacterial masterbatch formed by mixing and melting and kneading by weight.