JP3097556B2 - Blow molding and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article obtained by blow molding a glass member or a resin member into a predetermined shape and a molding method thereof, and more particularly to a blow molding by supplying a pressure fluid containing a photocatalyst into a parison. The present invention relates to a molded article in which a photocatalyst is disposed on the inner surface side of a container in a process of performing the molding, and a molding method thereof.

[0002]

2. Description of the Related Art In recent years, drinking containers made of glass members and resin members are molded by injection molding or blow molding. For example, JP-A-5-8287 and JP-A-5-31
No. 8562 discloses a method for manufacturing a container.

[0003]

However, in the above-mentioned molded articles and molding methods, there is no proposal on a structure having a photocatalyst on the inner surface side of the container or a method of disposing the photocatalyst.

According to the present invention, a photocatalyst is scattered and buried, or an adhesive containing a photocatalyst is applied to the inner surface of a hollow portion of a molded product, that is, a surface in contact with a pressurized fluid, by a blow molding process. It is another object of the present invention to provide a blow molded product having a photocatalyst and a blow molding method at low cost.

[0005]

In order to solve the above-mentioned problems, a molded article having a hollow portion or the like according to the present invention is configured to use a pressure fluid containing a photocatalyst at the time of blow molding.

More specifically, a plasticized parison is supplied into a mold, and then a pressure fluid containing a photocatalyst is introduced into the parison, and the photocatalyst is disposed on the inner surface side of the hollow portion in the process of forming a molded product. It is configured to be installed.

[0007] Any member may be used as the photocatalyst. For example, fine powder particles of a photocatalyst made of titanium dioxide or a mixture of titanium dioxide and activated carbon are used. By disposing the powder particles of the photocatalyst or the thin film of the adhesive containing the photocatalyst on the inner surface side of the molded article, the inner surface can be prevented from being stained, bacteria on the inner surface can be killed, and the smell attached thereto can be removed.

[0008] That is, 300 nm to 40
The photocatalyst which has received near-ultraviolet light of 0 nm is activated and oxidizes and decomposes organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds and the like. It also decomposes carcinogenic substances such as trihalomethane contained in tap water.

The fine powder particles of the photocatalyst, such as titanium dioxide or a mixture of titanium dioxide and activated carbon, have an outer shape of 0.01 to 100 μm. When the photocatalyst is contained in the adhesive and supplied into the parison, the mixing ratio with the adhesive is about 0.1% to 30% by weight.

[0010] The state of the photocatalyst provided on the inner surface of the parison may be arbitrarily implemented such as dotted or coated. In the case of a film, the coating thickness may be arbitrarily determined according to the purpose of use. For example, an adhesive containing a photocatalyst may be applied to a thickness of about several microns to 100 microns.

The structure of the photocatalyst is described in, for example,
No. 5853 has been proposed. Here, a highly active photocatalyst is formed by bringing a catalyst carrying a reducing catalytically active component and a photocatalyst carrying an oxidizing catalytically active component into contact with each other, and further contacting a water-repellent substance with one of them. are doing.

As a specific example, a component having catalytic activity for a reduction reaction of carbon dioxide gas such as copper or mercury is carried on a conductive carrier such as carbon black. In addition, a component such as silver or platinum having a catalytic activity for oxidizing water is supported on a semiconductor such as titanium dioxide. Then, the two are brought into contact with each other, but recombination of charges is prevented because the active sites are separated. Also, because the water-repellent substance is brought into contact with any of them,
The catalyst floats and is present in the aqueous solution surface layer to obtain a highly active photocatalyst.

The titanium alkoxide compound is dissolved in an equimolar amount of ethanol or the like, and hydrolyzed by adding hydrochloric acid or the like. The obtained titanium compound can be formed into any shape without a binder.

The titanium dioxide is preferably an anatase type, but may be a rutile type titanium dioxide metallized with copper, silver, platinum or other metals.

WO ↓ 2, Cds, SrTiO ↓
2, a photocatalyst may be formed of a semiconductor such as MoS ↓ 2.

The photocatalyst contained in the pressure fluid may be mixed in any form such as powder, particles, or flakes. For example, a form in which a powdery, particulate or flake-shaped photocatalyst having an outer dimension of 0.01 to 100 μm is mixed into a high-pressure gas (high-pressure gas) composed of compressed air or the like having a pressure of 8 kg / cmＫ2 or less. It is supplied by.

Further, the timing of supplying the photocatalyst to the blow molding material (parison) is arbitrarily determined. For example, when supplying a high-pressure gas containing a powdery, particulate, or flaky photocatalyst, the process is performed before the molding material (parison) in the mold cavity is cooled and solidified.

Of course, after the shape of the product is formed, a high-pressure gas containing a photocatalyst may be supplied continuously before the molding material (parison) is cooled and solidified.

Alternatively, a photocatalyst may be supplied into the parison in advance, and then the high pressure gas may be introduced to completely form the parison.

Alternatively, a high-pressure gas containing a photocatalyst may be supplied and preformed, and then the high-pressure gas may be introduced to completely form the parison.

In either case, it is desirable to supply the pressure fluid containing the photocatalyst while the blow molding material (parison) is tacky and has the ability to adhere the photocatalyst.

After the molding material has been cooled and solidified, a high-pressure gas containing a photocatalyst may be injected.

Further, a binder such as PVA (polyvinyl alcohol), acrylic or polyurethane, an epoxy resin, an acrylic resin, a vinyl chloride resin,
Any transparent adhesive resin such as ABS resin, PS resin, polyamide resin, polycarbonate resin, styrene resin, thermoplastic resin such as polybutylene terephthalate resin, or any diluent solvent such as alcohol, toluene, thinner, acetone, etc. May be included.

When a transparent adhesive resin containing a photocatalyst is supplied into the parison, the photocatalyst is initially coated with the adhesive resin, but the adhesive resin is decomposed by receiving near-ultraviolet rays of sunlight or a fluorescent lamp. And exposed.

It should be noted that the pressurized fluid may be heated to a predetermined temperature to facilitate the molding, accelerate the curing of the molded product, or facilitate the adhesion of the photocatalyst to the molding material.

Further, the present invention may be arbitrarily implemented as a member constituting a molded product. For example, ABS, PS, PP, PM
A resin member such as MA, PE, or PET, a glass member, or the like may be used. The translucent resin or the translucent glass activates the photocatalyst from outside the container.

The member constituting the molded article may be a biodegradable plastic. For example, a denatured protein material such as gluten, a material obtained by kneading paper and denatured protein, an agar material, a material obtained by kneading potato starch with water, a natural polymer Novamont (trade name: Materby / Nippon Synthetic Chemical Industry), a microorganism-producing material Polyester-based ICI (trade name: Biopol / ICI Japan), chemically synthesized aliphatic polyester (trade name: Bionole / Showa Kobunshi), and the like may be used arbitrarily.

According to the present invention, the characteristics of the resin member used for molding are not changed by the above configuration. Also, an arbitrary structure or a curved surface shape can be configured according to the variety of designs and the purpose of use. Of course, the quality of the molded product does not deteriorate.

Further, the photocatalyst can be disposed on the inner surface of the molded article in parallel with the molding process, so that the work of disposing the photocatalyst in a separate step is not required. Therefore, the process can be simplified and the cost can be reduced.

Further, the photocatalyst is provided on the inner surface of a drinking container or the like to decompose a carcinogenic substance such as trihalomethane or an organic substance.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a photocatalyst is disposed on the inner surface of a parison by introducing a pressurized gas containing the photocatalyst into the parison. The photocatalyst can be disposed on the inner surface side during the molding process, and the work of disposing the photocatalyst in a separate step is not required. Therefore, the process can be simplified and the cost can be reduced. Further, the photocatalyst has an action of decomposing trihalomethane and organic substances as carcinogenic substances.

According to a second aspect of the present invention, there is provided a blow-molded article characterized in that a photocatalyst is embedded in the inner surface of the parison by introducing a pressurized gas containing the photocatalyst into the parison. In the process, the photocatalyst can be provided, and the cost can be reduced. Further, it has an effect of decomposing trihalomethane, organic substances, and the like.

According to a third aspect of the present invention, there is provided a blow molded product wherein a photocatalyst is disposed on the inner surface of the parison by introducing a pressure gas containing a photocatalyst and an adhesive into the parison. Thus, the photocatalyst can be provided during the molding process, and the cost can be reduced. Further, it has an effect of decomposing trihalomethane, organic substances, and the like.

According to a fourth aspect of the present invention, there is provided a blow molded article according to the third aspect, wherein the molded article is a drinking container, and a photocatalyst can be disposed in the molding process, thereby reducing costs. it can. Further, it has an effect of decomposing trihalomethane, organic substances, and the like.

According to a fifth aspect of the present invention, there is provided a blow-molded article according to the fourth aspect, characterized in that the drinking container is capable of transmitting light. Can be reduced. Further, it has an effect of decomposing trihalomethane, organic substances, and the like.

According to a sixth aspect of the present invention, a photocatalyst is disposed on the inner surface of a molded article by introducing a pressurized gas containing a photocatalyst into the parison after supplying the plasticized parison into the mold. This is a blow molding method characterized in that the photocatalyst can be provided in the molding process and the cost can be reduced.

According to a seventh aspect of the present invention, a molded article is formed in the process of molding a molded article by supplying a pressurized gas containing a photocatalyst into the parison after supplying the plasticized parison into the mold. This is a blow molding method characterized by disposing a photocatalyst on the inner surface of the device, and has an effect that the photocatalyst can be disposed in the molding process and the cost can be reduced.

According to the present invention, after the plasticized parison is supplied into the mold, a pressurized fluid is introduced into the parison and molded, and then the photocatalyst is contained before the parison is cooled and solidified. A blow molding method characterized by disposing a photocatalyst on the inner surface of a molded article by introducing a pressurized gas into the parison, which has an effect that photocatalysts can be arranged in the molding process and cost can be reduced. Have.

Hereinafter, an example of a blow molded article and a molding method according to an embodiment of the present invention, in which a resin member is blow molded to form a drinking container, will be described with reference to the drawings shown in FIGS.

(Embodiment) FIG. 1 is a sectional view of a drinking container according to an embodiment of the present invention. FIG. 2 is a sectional view of a main part of a blow molding apparatus used for molding according to the present invention, and FIG. 3 is an enlarged sectional view of a mold in FIG.

As shown in FIG. 1, the drinking container 20 of the present invention
Reference numeral 0 denotes a polyester bottle, which has a photocatalyst 201 on the inner surface side of the container.

The members constituting the drinking container 200 include P
It may be composed of any light transmitting member such as ET (polyethylene terephthalate), acrylic, polycarbonate, vinyl chloride, urea resin and the like. Of course, other opaque resin members such as ABS, PP, PS, and epoxy may be arbitrarily implemented.

The first means for providing a photocatalyst on the inner surface side of the container is as follows: an adhesive member containing the photocatalyst is spray-coated, or an adhesive member containing the photocatalyst and a diluting solvent is injected into the container, and the container is closed. Is applied by shaking or rolling.

As an adhesive member containing a photocatalyst, a thermosetting acrylic resin member (for example, acrylic melamine resin)
Or alkyd melamine resin member, or synthetic resin member (or organic binder) such as vinyl acetate, fluorine resin, silicon resin, urethane resin or polyester resin, phenol resin, or polyvinyl chloride And any one of them.

The coating thickness of the adhesive member containing the photocatalyst is about 0.1 μm to 100 μm. The mixing ratio of the photocatalyst to be mixed with the adhesive member is 0.1.
The range is 1 W% to 30 W%.

It should be noted that an epoxy resin-based adhesive member may be used in addition to the above-mentioned adhesive member. In this case, after dispersing the photocatalyst in the adhesive member containing the epoxy resin, the photocatalyst is applied to the inner surface of the container. Then, after primary drying at 30 to 50 degrees Celsius and evaporating the thinner, secondary drying is performed at 80 to 200 degrees Celsius to form a coating layer containing a photocatalyst.

Further, it goes without saying that an organic adhesive member, a water-soluble adhesive member, a UV resin, or the like other than those described above may be used.

It goes without saying that any other method such as dip coating, electrostatic coating or powder coating may be used as the coating method.

The particle diameter of the powder of the photocatalyst contained in the adhesive is in the range of 0.01 μm to 100 μm.

Next, a second means for providing a photocatalyst on the inner surface side of the container is shown in FIGS. The blow molding apparatus shown in FIGS. 2 and 3 shows the concept of a method of applying or embedding a photocatalyst on the inner surface side of a container in the process of molding. 2 and 3 do not necessarily indicate an accurate drinking container.
For convenience, a generally convex bottomed container is shown.

In the molding procedure, first, a plasticized parison (molding material) is supplied into a mold. Next, a blow molding method is adopted in which a pressure fluid containing a photocatalyst is introduced into the parison, and a photocatalyst coating layer or the like is formed on the inner surface side in the process of forming a drinking container.

For example, a high-pressure gas (high-pressure gas) composed of compressed air or the like having a size of 8 kg / cm @ 2 or less
It is supplied in the form of mixing a powdery photocatalyst of 1 to 100 μm.

The timing of supplying the photocatalyst to the blow molding material (parison) is arbitrarily determined. For example, when supplying a high-pressure gas containing a powdery photocatalyst, the process is performed before the resin in the mold cavity is cooled and solidified.

Of course, a high-pressure gas containing a photocatalyst may be supplied after the drinking container is formed and before the drinking container is cooled and solidified.

Alternatively, a pressurized gas may be supplied to the parison in advance, and then a high-pressure gas containing a photocatalyst may be introduced into the parison.

Alternatively, a high-pressure gas containing a photocatalyst may be first introduced into the parison, and then a pressurized gas may be introduced into the parison to form the parison.

In any of the above cases, it is desirable to supply the pressure fluid containing the photocatalyst while the blow molding material (parison) is tacky and has the ability to adhere the photocatalyst.

After the drinking container is cooled and solidified, a high-pressure gas containing a photocatalyst may be injected.

Further, the high-pressure gas may contain a binder such as PVA (polyvinyl alcohol), an acrylic resin, a polyurethane resin, an adhesive resin, a diluting solvent, or the like so that the photocatalyst does not peel off from the adhered surface. That is, it is needless to say that any solvent such as alcohol, toluene, thinner, and acetone may be mixed. Epoxy resin, acrylic resin, vinyl chloride resin, ABS resin, PS resin, polyamide resin, polycarbonate resin, styrene resin A predetermined amount of an arbitrary resin member such as a resin or a thermoplastic resin such as a polybutylene terephthalate resin may be included.

As the pressure fluid, nitrogen gas, inert gas (eg, argon gas) or the like may be used in addition to compressed air.

As described above, the coating layer of the photocatalyst can be formed in the process of blow molding, and the work of forming the coating layer in a separate step is not required. Therefore, the process can be simplified and the cost can be reduced.

Next, the blow molding apparatus and the molding process will be described. FIG. 2 shows a conceptual diagram of a main configuration of the blow molding apparatus.

The screw cylinder 6 has a heating means and a hopper (not shown). The thermoplastic resin member 10 supplied from the hopper is heated by the screw cylinder 6 and sent to the plunger 40 of the accumulator 4 while melting. .

Below the accumulator 4, a pair of split molds 1, 1 provided with a predetermined concave portion (cavity) and formed to be openable and closable are provided. The molten resin member 10 extruded by the plunger 40 is extruded into the gap between the dies 1 and 1 while being formed as a cylindrical parison 11 by the die 5 provided at the lower end of the accumulator 4.

When the parison 11 is pushed out to a predetermined length, the driving of the plunger 40 is stopped, and the blow pin 2 is moved to the inner periphery of the parison 11 which can be clamped by the dies 1,1.
Insert The blow pin 2 communicates with a pressurized air source 3 via a valve or the like (not shown) to supply only pressurized air.

The supply pipe is formed by a pipe that penetrates the molds 1 and 1 and communicates with the pump 30 that supplies the high pressure gas containing the photocatalyst alone or the photocatalyst. here,
When the dies 1, 1 are closed (closed) by a driving means (not shown), as shown in FIG. 3, the parison 11 has its upper portion sandwiched by the dies 1, 1 and its lower portion has an inner periphery. The blow pin 2 is sandwiched between the dies 1 and 1 in a protruding state.

Thereafter, a valve (not shown) is opened, and a high-pressure gas 7 containing a photocatalyst alone or a high-pressure gas 7 containing a photocatalyst and a binder is supplied from a supply pipe line into the parison 11, and the photocatalyst is removed. The cavity is filled and adhered to the inner surface of the parison 2.

Next, pressurized air is supplied from the blow pin 2 to the inner peripheral side of the parison 11, and the parison is expanded so as to adhere to the cavity shape of the mold and is molded.

According to these processes, the photocatalyst is buried in the surface of the molded article at a predetermined rate or disposed so as to form a coating layer with a predetermined thickness. Therefore, the photocatalyst can be fixed to the inner surface of the molded article in the process of blow molding.

The photocatalyst disposed on the inner side of the container is:
Needless to say, it may be configured arbitrarily, such as in the form of a film or dotted. Further, the photocatalyst may be vigorously collided with the parison surface, and at least a part of the photocatalyst may be embedded in the parison surface.

Further, when the material of the container is made light-transmissive, the container may be made of an arbitrary member. Further, the shape of the container may be arbitrarily performed, and it is not always necessary to have a bottleneck in which the upper portion of the container is narrowed.

[0072]

As described above, according to the present invention, the photocatalyst is easily disposed on the inner surface side of the drinking container in the process of blow molding. Therefore, the work of arranging the photocatalyst after molding is unnecessary. As a result, the process can be simplified and the cost can be reduced.

Further, the characteristics of the resin member used for blow molding are not changed. For example, without changing the molding characteristics of the resin member, an arbitrary structure or a curved surface shape can be configured according to the variety of designs and the purpose of use.

The photocatalyst provided on the inner side of the container decomposes contaminants adhering to the molded article. In addition, it decomposes trihalomethane contained in tap water and prevents carcinogenesis.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a drinking container according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a blow molding apparatus used for molding according to the present invention.

FIG. 3 is an enlarged sectional view of a mold in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold 2 blow pin 3 pressurized air source 7 pressure fluid containing photocatalyst 11 parison 30 pump 200 drinking container 201 photocatalyst

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B65D 1/00-1/48

Claims (2)

(57) [Claims] 1. A blow-molded article wherein a photocatalyst is disposed on an inner surface of the parison by introducing a pressure gas containing a photocatalyst and an adhesive into the parison. 2. After the plasticized parison is supplied into a mold, a pressure gas containing a photocatalyst and an adhesive is introduced into the parison so that the photocatalyst is disposed on the inner surface of the molded article. A blow molding method characterized by the above-mentioned.