JP2005067142A - Polyester resin molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester resin molded product having an antibacterial property, preferably also having, in combination, a characteristic of preventing insects from coming flying. <P>SOLUTION: The transparent polyester resin molded product comprises a base layer 1 and an antibacterial agent-containing surface layer 2. The antibacterial agent suppresses the breeding of bacteria adhering to the surface of the molded product. Further, the molded product composed so as to block out the light having the wavelengths of ≤520 nm has, in combination, the antibacterial property and the characteristic of preventing insects from coming flying. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an antibacterial polyester resin molded body, and more particularly to an antibacterial polyester resin molded body that blocks light in the visible region of ultraviolet rays or short wavelengths and suppresses flying insects.

  Polyester resins are rich in translucency and do not generate harmful gases when burned, and thus have been used in various applications in recent years. Among these polyester resins, amorphous polyester resins having two glycol components, ethylene glycol and cyclohexane dimethanol, do not whiten even when bent cold, and are easy to manufacture. Applications are expanding. As one of the applications, the applicant has developed a molded body having a thickness of 1 to 10 mm in which the flying insects are prevented from flying (see Patent Document 1). The molded body is confirmed to have a function of preventing the flying insects from flying by adding a pigment or the like to the amorphous polyester resin and blocking light having a wavelength of 520 nm or less. It is used for such as.

However, in food factories and the like, it is necessary not only to prevent insects from flying, but also to prevent the attachment and invasion of bacteria, so that the partition material for partitioning the interior and the exterior is also required to have an antibacterial function. It was.
JP 2003-128796 A

  The present invention has been made in order to solve the above-mentioned problems, and is an antibacterial polyester resin molding used not only for partition materials but also for food factory machine covers, factory side walls, containers and the like. The main purpose is to provide a body.

  Another object of the present invention is to provide a molded article used for a partition material having both antibacterial properties and insect flying prevention properties.

  Therefore, the polyester resin molded body according to the present invention is a translucent polyester resin molded body composed of a base layer and a surface layer, and is characterized in that an antibacterial agent is contained in the surface layer.

  The polyester resin molded body preferably has a surface layer thickness of 10 to 200 μm, an average particle diameter of the antibacterial agent of 1 to 50 μm, and at least a part thereof is exposed from the surface. It is also preferable that the agent is contained in the surface layer in an amount of 0.05 to 5.0% by weight. The polyester resin is preferably an amorphous copolymer of dicarboxylic acid, diethylene glycol, and 1,4 cyclohexanedimethanol. Furthermore, it is also preferable that the polyester resin molded body has a thickness of 1 to 10 mm, substantially blocks wavelengths of 520 nm or less, and has a total light transmittance of 20 to 70% at a thickness of 5 mm.

  Since the polyester resin molding of the present invention contains an antibacterial agent in the surface layer, the growth of bacteria attached to the surface is suppressed, and bacteria are prevented from entering the room. When the antibacterial agent is exposed from the surface, the antibacterial action is remarkably exhibited, and further bacteria can be prevented from entering.

  Further, when an amorphous polyester resin is used as the polyester resin, the impact strength of the molded resin is high, and there is no risk of damage even when used for food machine covers, partitioning materials, passage wall materials, etc. Even if the light is substantially blocked, the total light transmittance can be maintained at 20 to 70%, and a translucent molded article having antibacterial properties and insect flying prevention functions can be obtained.

  The best embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view of a polyester resin molded article of the present invention, showing an antibacterial molded article that also has anti-flying insects. The structure is a plate material having a three-layer structure in which surface layers 2 and 2 are formed on both surfaces of the base layer 1, and the surface layers 2 and 2 contain an antibacterial agent.

  The base layer 1 is a layer made of a translucent polyester resin, and has a thickness of 1 to 10 mm. A colorant such as a pigment or a dye is added to the base layer 1 to substantially emit light having a wavelength of 520 nm or less. It is colored orange or yellow so as to block it. Here, substantially blocking means that light having a wavelength of 520 nm or less is blocked by 95% or more, preferably 99% or more.

  Examples of the polyester resin include crystalline polyester resin, amorphous polyester resin, and mixed resin of polyester resin and polycarbonate resin. Among these, a molded body made of an amorphous polyester resin is preferably used because it can be cold-processed, has mechanical strength, and is excellent in transparency. This amorphous polyester resin is typically a copolymer resin of dicarboxylic acid, ethylene glycol and 1,4 cyclohexanedimethanol in which 10 to 70% of the ethylene glycol component in polyethylene terephthalate is replaced with 1,4 cyclohexanedimethanol. This resin is sold by Eastman Chemical Company under the trade name “SPECTAR”. Specifically, it is made amorphous by setting the molar ratio of ethylene glycol and 1,4 cyclohexanedimethanol to about 7: 3. In addition, a resin in which the copolymer resin and the polycarbonate resin are mixed to improve heat resistance is also preferably used.

  A coloring agent such as a pigment or a dye is added to the amorphous polyester resin to substantially block light having a wavelength of 520 nm or less, and the total light transmittance at a thickness of 5 mm is 20 to 70%, haze. The value is set to 0.1 to 8.0%. As the pigment and the like, known ones such as perylene-based and anthoraquinone-based pigments are used, and it is possible to obtain a molded article that can prevent the flying insects from flying by coloring the pigment so as to exhibit an orange or yellow color. . When the total light transmittance is 20% or less, it is difficult to see the opposite side of the partitioning material, and when it is 70% or more, it is difficult to block light having a wavelength of 520 nm or less. More preferable total light transmittance is 30 to 60%, and haze value is 0.1 to 3.0%.

  In addition, the amorphous polyester resin molded article has excellent mechanical strength and excellent secondary processability such as cold bending, so that it does not break even when used for food machine covers, etc. When the product shape is required, it is possible to easily form a deformed product by bending it in the cold to adjust the shape, or by vacuum forming or pressure forming.

  On both surfaces of the base layer 1, surface layers 2 and 2 containing an antibacterial agent are laminated. As the resin used for the surface layer 2, the resin used for the base layer 1 is used, and amorphous polyester is most preferably used for adhesion to the base layer 1.

  The surface layer 2 may be a layer in which light having a wavelength of 520 nm or less is blocked as in the base layer 1 by adding a pigment, or may be a colorless and transparent layer without adding a pigment. What is necessary is just to substantially block light having a wavelength of 520 nm or less as a body.

  As the antibacterial agent, known materials such as zeolite, glass and silica gel containing metal ions such as silver ions, copper ions, zinc ions, aluminum ions and magnesium ions can be used. Among these, the glass carrying silver ions, copper ions, zinc ions alone or in combination with antibacterial performance and antifungal performance is rare even if it is contained in a translucent resin. Since the supported metal ions are released little by little under water or moisture, the metal ions are preferably used because they exhibit a function for a long time.

  And it is preferable that the average particle diameter of this antibacterial agent is 1-50 micrometers, and it can expose a part of this antibacterial agent from the surface of the surface layer 2 by making the thickness of the surface layer 2 into 10-200 micrometers. it can. If the antibacterial agent is an inorganic substance such as glass, it will not be compatible with the translucent resin, so it will bleed out from the surface layer 2 and concentrate on the surface side to be easily exposed from the surface, and has long-term antibacterial performance. It will be. Preferably, an antibacterial agent having a particle size of 3 to 30 μm, more preferably 5 to 20 μm is used, and the thickness of the surface layer 2 is set to 30 to 100 μm.

  These antibacterial agents are preferably contained in the surface layer 2 in an amount of 0.05 to 5.0% by weight. When this amount is included, the antibacterial agent can be uniformly contained in the surface layer 2 from the surface. The amount is sufficient for exposure. The more preferable content is 0.1 to 4.0% by weight, and the most preferable content is 0.1 to 2.0% by weight.

  The antibacterial molded article having the above-described constitution of the present invention, which has anti-light-growth insect flying prevention, includes a base layer molding resin composition in which a colorant is added to an amorphous polyester resin, and an antibacterial agent in the amorphous polyester resin. It can be easily manufactured by preparing the added resin composition for surface layer molding and coextrusion molding using a three-layer coextrusion molding die. Alternatively, each calender sheet can be made with each resin compound, and the calender sheets for the surface layer can be stacked on top and bottom of a plurality of calender sheets for the base layer, followed by hot pressing and laminating and integrating easily. Can be manufactured.

  Although the said embodiment is an antibacterial molded object which has anti-light-flying insect flying prevention, the translucent polyester resin molded object which has only an antibacterial function may be sufficient. In this case, a colorless and transparent base layer 1 obtained by molding without adding a colorant such as a pigment to the base layer molding resin composition is laminated, and a colorless and transparent surface layer 2 to which an antibacterial agent is added is laminated on both sides. What is necessary is just to set it as the integrated molded object. The colorless and transparent molded body preferably has a total light transmittance of 70 to 90% and a haze value of 0.1 to 5.0%. Since other polyester resins, antibacterial agents, thicknesses, and the like are the same as those in the above-described embodiment, description thereof is omitted.

  Although each said embodiment showed the polyester resin molded object which formed the surface layer 2 on both surfaces of the base layer 1, you may form the surface layer 2 only in one side. In this case, the surface that does not have the surface layer 2 may be the outermost layer of the base layer 1, but as shown in FIG. 2, the surface of the base layer opposite to the surface layer 2 that exhibits the antibacterial function is controlled. A functional layer 3 such as an electric layer, a hard coat layer, or a hydrophilic coat layer may be formed. When the antistatic functional layer 3 is used, it is possible to prevent dust or the like from adhering to the inside of the room or the food machine. Further, when the hard coat functional layer 3 is provided, it is difficult to be damaged over a long period of time, and the transparency can be maintained. Further, when the hydrophilic coat functional layer 3 is present, an antifogging effect can be imparted.

  Hereinafter, specific description will be given based on examples.

(Example 1)
Eastman Chemical's amorphous polyethylene terephthalate resin “SPECAR” containing 0.10% by weight of pigment “Perylene Orange” and 0.05% by weight of “benzotriazole UV absorber” Adjusted. Further, a surface layer formulation was prepared in which 0.5% by weight of an antibacterial agent composed of glass particles supporting silver ions was contained in the “SPECAR”. These blends were subjected to an extruder equipped with a three-layer coextrusion die, and each transparent surface layer having a thickness of 0.10 mm was laminated on both sides of an orange base layer having a thickness of 4.8 mm. A 5.0 mm orange transparent three-layer coextruded plate was formed. The hue of the obtained amorphous polyethylene terephthalate resin plate was measured based on JIS Z8729 using a color difference meter “SZ-Σ80” manufactured by Nippon Denka Kogyo Co., Ltd., and the results are shown in Table 1. Moreover, the transmittance | permeability according to wavelength was measured using the Shimadzu Corporation spectroscopic light transmittance measuring machine "Shimadzu self-recording spectrophotometer UV-3100", and the result was shown in FIG.

  Further, this orange transparent three-layer coextruded plate was used, and an antibacterial test was conducted according to JIS Z2801 “Antimicrobial processed product-antibacterial test method / antibacterial effect”. As a test bacterium, Escherichia coli NBRC 3972 was used, and the antibacterial performance was shown by the number of viable bacteria per one. The results are listed in Table 2.

(Example 2)
Both sides of a transparent base layer having a thickness of 4.8 mm, as in Example 1, except that the amorphous polyethylene terephthalate resin “SPECAR” manufactured by Eastman Chemical Co., used in Example 1 was used as the resin composition for the base layer. A colorless and transparent three-layer coextruded plate having a thickness of 5.0 mm was formed by laminating each transparent surface layer containing an antibacterial agent having a thickness of 0.10 mm. The hue and transmittance for each wavelength of this co-extruded plate were measured in the same manner as in Example 1. The hue was also shown in Table 1, and the transmittance for each wavelength was shown in FIG. Further, the antibacterial test was also conducted in the same manner as in Example 1, and the results are also shown in Table 2.

(Comparative Example 1)
Amorphous polyethylene terephthalate resin “SPECAR” manufactured by Eastman Chemical Co., Ltd. used in Example 1, 0.10% by weight of pigment “perylene orange” and 0.05% by weight of “benzotriazole UV absorber” % Added formulation was prepared, and this was subjected to an extruder to form an orange transparent single layer extruded plate having a thickness of 5.0 mm. The hue and transmittance by wavelength of this single-layer extruded plate were measured in the same manner as in Example 1. The hue was also shown in Table 1, and the transmittance by wavelength was shown in FIG. Further, the antibacterial test was also conducted in the same manner as in Example 1, and the results are also shown in Table 2.

(Comparative Example 2)
The amorphous polyethylene terephthalate resin “SPECAR” manufactured by Eastman Chemical Co., used in Example 1 was used as a blend, and this was used in an extruder to mold a colorless transparent single layer extruded plate having a thickness of 5.0 mm. The hue and transmittance for each wavelength of this single-layer extruded plate were measured in the same manner as in Example 1. The hue is shown in Table 1 and the transmittance for each wavelength is shown in FIG. Further, the antibacterial test was also conducted in the same manner as in Example 1, and the results are also shown in Table 2.

  From the results in Table 1, Examples 1 and 2 in which a surface layer containing an antibacterial agent was formed on the surface, even if compared with Comparative Examples 1 and 2 in which the surface layer was not formed, hue and total light transmission It was found that there was no change in rate and haze value and the antimicrobial agent had no effect on them. In Example 1 and Comparative Example 1, since the pigment is added to form an orange color, the total light transmittance is about 45%. Had enough. Moreover, in haze value, although Example 1 was about 1% larger than Comparative Example 1, it had transparency without cloudiness. On the other hand, in Example 2 and Comparative Example 4 which became colorless and transparent without adding a pigment, the total light transmittance was about 86%, and the haze values were 1.1% and 0.1%. It has transparency.

Moreover, from Table 2, it can be seen that Examples 1 and 2 having a surface layer containing an antibacterial agent have a sufficiently reduced antibacterial activity after 24 hours and have a sufficient antibacterial effect. However, in Comparative Examples 1 and 2, which do not have a surface layer, the numerical value increases as much as 10 ² after 24 hours, and it can be seen that viable bacteria have grown 100 times.

  On the other hand, from FIG. 3 to FIG. 6, in Example 1 (FIG. 3) and Comparative Example 1 (FIG. 5) to which a pigment was added, light having a wavelength of 520 nm or less was not transmitted at all. It can be seen that it can be prevented from flying. However, Example 2 (FIG. 4) and Comparative Example 4 (FIG. 6), which are colorless and transparent, transmit about 15% of light even at a wavelength of 350 nm, and 80% or more when the light becomes a wavelength of 400 nm. It can be seen that it does not prevent the traveling insects from flying.

  From these results, it can be seen that the plate having the antibacterial agent-containing surface layer has sufficient antibacterial performance. It was also found that by adding a pigment or the like, the wavelength of 520 nm or less can be blocked, and the flying insects can be prevented from flying.

  Since the present invention exerts an antibacterial effect by the surface layer, it can be used not only in food factory partitions, machine covers, passage side walls, but also in hospitals, food stores, supermarkets, restaurants, convenience stores and the like. Furthermore, a molded article that blocks light having a wavelength of 520 nm or less can prevent the traveling insects from flying, and becomes a molded article that is more suitable for the above-described use that requires both antibacterial properties.

It is sectional drawing which shows one Embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is a graph which shows the transmittance | permeability according to wavelength of the molded object of this invention. It is a graph which shows the transmittance | permeability according to wavelength of the other molded object of this invention. It is a graph which shows the transmittance | permeability according to wavelength of the molded object of a comparative example. It is a graph which shows the transmittance | permeability according to wavelength of the molded object of another comparative example.

Explanation of symbols

1 base layer 2 surface layer 3 functional layer

Claims (5)

  A polyester resin molded article, which is a translucent polyester resin molded article comprising a base layer and a surface layer, wherein the surface layer contains an antibacterial agent.   2. The polyester resin according to claim 1, wherein the surface layer has a thickness of 10 to 200 μm, an average particle diameter of the antibacterial agent is 1 to 50 μm, and at least a part thereof is exposed from the surface. Molded body.   The polyester resin molded body according to claim 1 or 2, wherein the antibacterial agent is contained in the surface layer in an amount of 0.05 to 5.0% by weight.   The polyester resin molded article according to any one of claims 1 to 3, wherein the polyester resin is an amorphous copolymer of dicarboxylic acid, diethylene glycol, and 1,4 cyclohexanedimethanol. The polyester resin molded body has a thickness of 1 to 10 mm, substantially blocks a wavelength of 520 nm or less, and has a total light transmittance of 20 to 70% at a thickness of 5 mm. The polyester resin molded product according to claim 4.

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