JP3189893U - PET bottle with inner bottom processed into a smooth surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing container capable of stirring and mixing a liquid or the like in a bottle using a commercially available PET bottle. SOLUTION: A potting resin 3 is injected into a concavo-convex portion of a PET bottle 1 having an uneven inner bottom and solidified to process the concavo-convex portion into a flat surface. As the potting resin, a urethane resin composed of a main agent and a curing agent is preferable from the viewpoint of workability such as injection and solidification. The liquid in the bottle can be effectively agitated by putting a liquid 4 such as water in this bottle, further putting a rotor 5 and rotating the rotor on the magnetic stirrer 6. [Selection diagram] Fig. 3

Description

  The present invention relates to a PET bottle container in which liquid-liquid, liquid-gas, and the like are mixed and dissolved by stirring.

  Polyethylene terephthalate (abbreviated as PET) is used in various containers because of its excellent balance of resin performance. In particular, containers such as tea, carbonated drinks and seasonings are widely used as PET bottles, and a social infrastructure for recycling their resources has been established. In addition, bottles are processed for use even if they are not recycled, and they are often used for other purposes such as windmills for avoiding harmful birds and mole retraction jigs.

  The present invention intends to effectively use a PET bottle overflowing on a daily basis as an apparatus for mixing and dissolving liquids and gases. A PET bottle that is easily processed so that the liquid and gas in the bottle can be stirred with a magnetic stirrer. Is to provide.

  The above problem is solved by a PET bottle in which the inner bottom having irregularities is solidified with resin and the upper surface of the bottom is molded into a flat shape. In this bottle, the resin is preferably a two-part potting resin comprising a main agent and a curing agent. Furthermore, the potting resin is more preferably a polyurethane resin. Of these bottles, the PET bottle is preferably a thick bottle for carbonated beverages.

  A stirring vessel excellent in airtightness could be obtained by applying a simple process to a commercially available PET bottle. Since waste can be made into a product with high added value, it can be expected to be used in laboratories and as a portable mixing container as an energy-saving technology.

Figure 1 is a schematic diagram of a vertical cross section of a PET bottle Fig. 2 is a schematic view of the bottle longitudinal section in which the inner bottom of the PET bottle is hardened with resin. FIG. 3 is a schematic view showing a state in which the liquid is put into the PET bottle of the present invention and the liquid is stirred on the magnetic stirrer.

  The present invention is a container in which a liquid (4) or gas is introduced into a PET bottle (1) and stirred or mixed or dissolved, as illustrated in FIG. 6) A container that stirs and mixes the liquid and gas of the contents by rotating the rotor (5) placed on the inner bottom surface of the bottle with a stirrer. Therefore, in order for the rotor to smoothly rotate on the inner bottom surface of the bottle, the surface on which the inner bottom surface and the rotor are in contact needs to be flat.

  On the other hand, commercially available PET bottles often have an inner bottom surface that is not flat for various reasons. In particular, PET bottles containing carbonated beverages use bottles using thick PET in order to prevent air spilling from carbon dioxide bottles and to withstand the pressure of high-pressure carbon dioxide. Further, this bottle is not flat but has a concavo-convex shape as illustrated in FIG. 1 because the bottom surface increases pressure resistance and mechanical strength. The present invention provides a bottle in which the inner bottom of such a PET bottle having an irregular shape is solidified with a resin (3) as illustrated in FIG. 2 and the upper surface of the inner bottom is processed into a flat shape. .

  Several methods can be employed as a method of solidifying the inner bottom with resin. Examples of such casting resins or potting resins include polyurethane resins, epoxy resins, unsaturated polyester resins, urea resins, silicone resins, methacrylic resins, polyamide resins and the like. The casting method also varies depending on the type of resin, but polyurethane resin, epoxy resin, etc. are solidified by injecting a mixed liquid in which the main agent and curing agent are mixed and reacting the two agents.

  On the other hand, for a methacrylic resin, a method in which a liquid obtained by mixing a resin monomer or oligomer and a polymerization initiator is injected and polymerized at the injection site to be solidified is used. As another method of hardening with resin, there is a method of melting a polymer compound having a low melting point and injecting the melt into a PET bottle. Polyethylene is a preferred resin for this melt polymer process because it has a melting point near 110 ° C. and is below the softening temperature of PET.

  In the present invention, any of these methods of casting and solidifying a resin can be adopted, but a method using a two-part potting agent composed of a main agent and a curing agent is preferable from the viewpoint of workability, and among them, a thermosetting polyurethane More preferably, a resin is used. Polyurethane reacts with a compound having two or more isocyanate groups such as toluene diisocyanate (main agent) and a compound having two or more hydroxyl groups such as polyether polyol (curing agent) to form urethane bonds three-dimensionally to solidify the resin. To use.

  Since the viscosity and curing time when the agent is mixed differ depending on the types of the main agent and the curing agent, it is necessary to select appropriately according to the working conditions. It is desirable that the resin in which the main agent and the curing agent are stirred and mixed is defoamed and injected into the PET bottle in a low-viscosity state where curing has not yet started. The amount of injection may be as long as the concave and convex portions on the inner bottom are filled with the resin and the top surface of the resin can form a flat surface. A large amount of resin is not preferable because the resin layer becomes thick and the magnetic force transmitted to the rotor of the magnetic stirrer becomes weak.

  In order to make the top surface of the resin flat, if the viscosity of the injected resin is relatively low, the flat surface is formed by its own weight before curing. In the case of resin with high viscosity, it is possible to process the top surface of the resin into a flat surface by injecting the resin into the centrifuge and applying centrifugal force to the resin in the depth direction (perpendicular to the inner bottom surface). It is.

  In order to accelerate the curing reaction, it is preferable to heat the resin part. The heating temperature is generally in the range of 40-60 ° C. Although the curing reaction proceeds even at room temperature, it may take several days to complete. Completing the curing reaction is important in terms of improving the physical properties of the resin. In particular, it is important for the container of the present invention to be used for the purpose of rotating the rotor by bringing the rotor into contact with the resin surface so that the hardness of the resin is high.

  Although there is no restriction | limiting in the PET bottle which can be used for this invention, By volume, it can process from the commercially available small volume of several hundred ml to the thing of a large volume of 2L vicinity. In particular, a thick bottle for carbonated drinks is useful because it has a pressure resistance of several atmospheres and can be used as an agitation / mixing dissolution apparatus that seals and dissolves gas in a liquid under pressure. The present invention will be further described below with reference to examples.

  A commercially available carbonated beverage thick PET bottle (300 ml capacity) was prepared. As shown in FIG. 1, the bottom portion of this bottle had an uneven shape. Stir and mix 62 parts by weight of a polyurethane resin molding base (product name: Coronate 4403 made by Nippon Polyurethane) and 38 parts by weight of a curing agent (product name: Nippon Pollan 4276 made by Nippon Polyurethane) as a potting resin, and deaerate in a vacuum deaerator. The casting resin was adjusted.

  By injecting 30 g of this casting resin into a prepared PET bottle, the concavo-convex portion of the inner bottom was filled with the resin, and the upper surface formed a flat surface. After standing at room temperature (about 25 ° C.) for 1 day, a curing reaction was carried out in a thermostatic bath at 50 ° C. for 2 days to complete the reaction. The obtained PET bottle is a bottle with light yellow urethane resin solidified at the bottom as shown in Fig. 2. When water is inserted and a rotor is inserted and rotated on a magnetic stirrer, it rotates smoothly and the contents The product water was stirred.

  A PET bottle for hydrogen water aquatic water that generates hydrogen by reacting a hydrogen generator with water in the inner lid described in JP 2012-176395A, and dissolves the hydrogen in the water in the PET bottle. Was used to make hydrogen water. In that case, the PET bottle processed with resin in Example 1 was used as a PET bottle, 250 ml of water was put into the bottle, a rotor was inserted, and 1 g of a hydrogen generator was filled in the inner lid, and the opening was filled. Inserted and sealed bottle with lid.

  The bottle side wall was squeezed by hand, the water in the bottle was introduced into the inner lid through a tube, and the hydrogen generated by reacting with the hydrogen generator was dissolved in the water in the bottle. At that time, in order to dissolve hydrogen in water in a short time, the bottle was placed on a magnetic stirrer and the water in the bottle was agitated by rotating the rotor simultaneously with the generation of hydrogen. After stirring for 10 minutes, the lid was opened and the inner lid was removed, and the dissolved hydrogen concentration (abbreviated as DH) in the hydrogen water in the bottle was measured by gas chromatography and found to be 1 ppm (weight basis).

  As a comparative example, 280 ml of water was put into a 300 ml PET bottle not subjected to resin processing, and hydrogen water was prepared using 1 g of a hydrogen generator in the same manner as described above. At that time, the PET bottle was left standing at the same time as the generation of hydrogen, and the relationship between the standing time and DH was measured. Although DH increased with time, it was as low as 0.57 ppm in 2 hours. Therefore, it was found that hydrogen water with high DH can be adjusted in a short time by stirring the water in the PET bottle as in the example. The hydrogen generator used in the above Examples and Comparative Examples contained calcium hydride and had the property of generating 54 ml (25 ° C.) of hydrogen from 1 g of the generator.

  The PET bottle of the present invention can be used as a simple stirring container, and can be usefully used in a hydrogen water fresh water device.

DESCRIPTION OF SYMBOLS 1 PET bottle body 2 Bottle lid 3 Solidified resin 4 Liquid 5 Rotor 6 Magnetic stirrer

Claims (4)

  A PET bottle in which the inner bottom having irregularities is solidified with a resin and the upper surface of the bottom is molded into a flat shape.   The PET bottle according to claim 1, wherein the resin is a two-part potting resin comprising a main agent and a curing agent.   The PET bottle according to claim 2, wherein the potting resin is a polyurethane resin.   The PET bottle according to any one of claims 1 to 3, wherein the PET bottle is a thick bottle for carbonated beverages.