JPH08120112A - Deodorizing expandable resin bead and deodorizing foamed molding - Google Patents

Abstract

PURPOSE: To obtain beads having excellent deodorizing ability and capable of providing a box material not leaving residual odor in replacing the contents as a box for cold insulation and heat insulation by forming the coating film of a methalo-phthalocyanine derivative-containing resin onto the surface of expandable styrene-based beads. CONSTITUTION: A coating film mixing a metal phthalocyanine derivative in an amount of 0.1-5wt.% based on the a resin solid content of an aqueous acrylic resin or an aqueous urethane resin (an emulsion composed of 40-50wt.% of resin solid content and 60-50wt.% of a water) therein is formed onto the surface of expandable styrene-based resin beads or expandable polyethylene-based beads to provide the objective expandable beads. These resultant resin beads or mixed beads of these resin beads with these expandable resin beads are subjected to expansion molding to produce the objective molding whose surface is attached by deodorizing coating film extended by expansion of beads. Cobalt phthalocyanine octacarboxylic acid, cobalt phthalocyanine tetracarboxylic acid, etc., is used as the derivative.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention was obtained by deodorizing foamable resin beads capable of imparting deodorizing ability to styrene resin foam molded products or polyethylene resin foam molded products and foam molding of these beads. The present invention relates to a deodorant foamed molded product.

[0002]

BACKGROUND OF THE INVENTION As is well known, expandable styrene resin beads or expandable polyethylene resin beads are, for example, propane, butane, pentane, etc., which are gaseous or liquid aliphatic hydrocarbons at room temperature in an aqueous medium together with the expandable beads. It is manufactured by a method of dispersing in and heating. The expandable resin beads thus obtained are heated with heated steam to be primary-foamed, then filled in a mold having pores, and heated steam is injected from the pores to be secondary-foamed to form a molded article.

Since the molded product produced in this manner is inexpensive, lightweight and excellent in heat insulating property, it is used for various containers (boxes) for heat insulation, heat insulation, packing materials or various buffers. Widely used as wood.

[0004]

As described above, the lightweight polystyrene foamed polyethylene resin beads or the expandable polyethylene-based resin beads are used widely as a box for keeping cold or keeping warm for various foods by utilizing the light weight and excellent heat insulating property. in use. However, in some cases, there are boxes for exclusive use of specific foods, but in many cases, the contents are different depending on the forward and return routes of transportation or each season. Therefore, the odor (smell) of the previously stored food adheres and remains in the container, and this residual odor transfers to the stored food after that, which impairs the unique odor of the stored food and reduces the commercial value. The difficulty arises that it causes a situation.

Further, for example, a foam molded article or a pneumatic bag made of polyethylene film molded into a shape which can be inserted into a shoe which is generally used for preventing the shape of a shoe is useful for keeping the shape of the shoe, The odor inside cannot be erased.

[0006] Such problems can be remedied to some extent by spraying the deodorant on the foamed molded product with the deodorant spray, but there is a concern that a part of the deodorant adheres to the contents in the box. In addition, the deodorizing ability cannot be maintained for a long time, so that it is not practical.

The present inventors have conducted various studies on safety, deodorant persistence, deodorant ability, or affinity with the surface of expandable styrene resin beads or expandable polyethylene resin beads, and as a result, deodorant As the metal phthalocyanine derivative, which is a metal complex having redox ability, is preferable, and as the fixing agent to the bead surface, the water-based acrylic resin or water-based polyurethane resin has a strong adhesive force with polystyrene or polyethylene, and the beads during pre-foaming. The inventors have found that it has a good spreadability that follows the expansion of the surface of, and have completed the present invention.

Therefore, an object of the present invention is to impart a deodorizing ability to a polystyrene or polyethylene foamed molded article,
It is an object of the present invention to provide a deodorant foamable resin bead and a deodorant foamed molded product which can solve the above-mentioned problems of conventional foamed molded products.

[0009]

According to the present invention, expandable styrene resin beads or expandable polyethylene resin beads are dipped in an emulsion (or an aqueous solution) of an aqueous acrylic resin or an aqueous urethane resin mixed with a metal phthalocyanine derivative. The problem was solved by uniformly adhering a small amount of a metal phthalocyanine derivative mixed through an acrylic resin or a urethane resin on the surface of beads.

That is, the expandable resin beads of the present invention have an aqueous acrylic resin or an aqueous urethane resin (resin solid content 40 to 50% by weight, water 60 to 50% by weight) on the surface of the resin beads.
The coating film is formed by mixing 0.1 to 5% by weight of the metal phthalocyanine derivative with respect to the resin solid content of the emulsion).

In the deodorant foamed molded article of the present invention, the deodorant foamable resin beads or mixed beads of the deodorant foamable resin beads and the foamable resin beads are foam-molded by a conventional method, It is characterized in that the deodorant coating film extended by the foam expansion of beads is attached to the surface of at least a part of the foamed molded product.

The expandable styrene-based resin beads or expandable polyethylene-based resin beads that have been conventionally used in foam-molded articles and have a particle size of 0.7 to 1.0 mm, such as Eslen beads [trade name: Sekisui] Chemical Industry Co., Ltd.], HiBeads 5SG [Product Name: Hitachi Chemical Co., Ltd.] or Kanepar [Product Name: Kanegafuchi Chemical Industry Co., Ltd.] and other commercially available expandable styrene resin beads or expandable polyethylene. Resin beads can be applied.

As the metal phthalocyanine derivative having deodorant properties, metal complexes having redox ability, such as metal porphyrin, metal porphyrazine and derivatives thereof are preferably used. A metal phthalocyanine derivative as a deodorant has a high rate of decomposition of a bad odor and a high decomposition rate, a reaction proceeds even at room temperature, a catalytic function in a bad odor decomposition reaction, and a long life. Most preferably used. Specific examples thereof include cobalt phthalocyanine octacarboxylic acid, cobalt phthalocyanine tetracarboxylic acid, cobalt phthalocyanine polysulfonic acid, iron phthalocyanine octacarboxylic acid and iron phthalocyanine tetracarboxylic acid.

As the water-based acrylic resin which serves as a fixing agent for the deodorant on the surface of the expandable styrene resin beads or the expandable polyethylene resin beads, there is a vinyl [trade name:
Kanae Chemical Co., Ltd.] (acrylic resin solid content 40-50
Examples of the water-based urethane resin include a trade name: HYDRAN [Dainippon Ink and Co., Ltd.] (emulsion similar to the above) and the like.

The amount of the deodorant attached to the expandable resin beads is
When the amount of the resin solid content of the emulsion is 0.1% by weight or more, a desired deodorizing ability can be imparted to the foamed molded product. The larger the amount of the adhering substance, the more effective it is, but the higher the cost becomes. Therefore, in consideration of economical efficiency and functionality, it should be kept within 5% by weight.

[0016]

[Function] Water-based acrylic resin or water-based urethane resin
The deodorant substance adhering to the surface of the expandable resin beads, which exhibits water absorption during pre-expansion by heating steam, is spread uniformly in accordance with the expansion and expansion of the beads. Also forms a thin layer of deodorant material on the surface of the foamed molded product. The metal phthalocyanine derivative contained in this thin layer acts as an artificial enzyme and cooperates with moisture in the air to decompose and eliminate the odor (odor) attached to the foamed molded product.

[0017]

【Example】

"Manufacturing method of deodorant foam beads" Cobalt phthalocyanine polysulfonic acid was prepared as a deodorant, and expandable polystyrene resin beads with a particle diameter of 1 mm were used as the foam beads "Product name: Eslen beads (Sekisui Chemical Co., Ltd.)" Got ready.

Next, 18 kg of water-based acrylic resin [trade name: Vinar (Nakae Chemical Co., Ltd.)], water 1.5
kg, cobalt phthalocyanine polysulfonic acid 0.04
An emulsion was prepared by mixing kg.

Then, 0.6 kg of the above emulsion was added to 10 kg of the expandable beads in a high speed mixer, stirred for 10 minutes to uniformly coat the emulsion on the bead surface, and then dried at 40 ° C. for about 5 hours. , A deodorant foamable bead having a light blue coating adhered to the surface.

"Production Example 1 of molded article" The obtained deodorant foam beads are pre-expanded about 50 times by a steam heating type pre-expanding machine, and after being aged for 24 hours, they are molded, and are generally used. It was used as a container for transporting food.

Frozen shrimp was first placed in the obtained container and left for 10 hours, then this frozen shrimp was taken out, and after 30 minutes, cabbage was stored and left for 10 hours. After that, when I took out the cabbage, I did not feel the smell of frozen shrimp in the cabbage.

For comparison, first, frozen shrimp were first placed in a conventional new container and left for 10 hours, then this frozen shrimp was taken out, and after 30 minutes, the cabbage was stored and left for 10 hours. After that, when the cabbage was taken out, the smell of frozen shrimp was transferred to the cabbage.

"Production Example 2 of Molded Product" Using the above-mentioned deodorant foamable styrene resin beads, foam molding is carried out by the same method as described above, and molding for preventing deformation of a shoe having a shape insertable into a shoe. It was a thing.

The obtained molded product was inserted into one shoe after wearing, and the conventional foam-molded product for shape retention was inserted into the other shoe and left for 12 hours. After that, when the molded product was taken out and the smell inside the shoe was smelled, the unpleasant odor due to perspiration during wearing remained in the shoe where the conventional molded product was inserted, but the molded product of the present invention was used. Almost no unpleasant odor due to perspiration during wearing was felt in the inserted shoe.

In order to further confirm the deodorizing effect, a rectangular box (vertical width dimension 250 mm, lateral width dimension 340 mm, height dimension 130 mm, foam wall thickness) generally used for dinner service with the above deodorant beads. 20
mm), make a foam molding box with a lid, seal the fitting part of the lid, and, as shown in Fig. 1, make holes on both sides of the box (1).
(2) From the hole (2) with the hole (2) opened, a mixed gas of ammonia gas and air adjusted to 250 ppm and a mixed gas of hydrogen sulfide gas and air adjusted to 250 ppm, 5 liters, are individually separated using a silicone rubber tube. Injected. After injecting the gas, the holes (2) and (3) were closed with a glass stopper, and the gas concentration in the box was examined with a gas detector at each time. Table 1 shows the results.

[0026]

[Table 1]

For comparison, a rectangular box generally used for a conventional dinner service (height width 250 m)
m, width dimension 340 mm, height dimension 130 mm, foam wall thickness 20 mm), sealed in the same manner as above and injecting the same mixed gas 5 l, and measuring the gas concentration in the box with time with a gas detector. Examination revealed that the gas concentration in the box showed a slight decrease even after 8 hours.

In the examples, styrene resin beads were used as the expandable beads, but the same effect as using expandable polyethylene resin beads instead of this was confirmed. Further, as a fixing agent for the deodorant to the expandable resin beads, an aqueous urethane resin having excellent hydrophilicity and spreadability is used instead of the aqueous acrylic resin, for example, trade name: HYDRAN [manufactured by Dainippon Ink and Chemicals, Inc.] or trade name: IMPRANIL
[Dainippon Ink Co., Ltd.] and the like can also be preferably used.

Although the deodorant molded article of the present invention may be formed only of deodorant foam beads, it may be formed by mixing deodorant foam beads with ordinary foam beads before deodorization processing. It may be a molded product.

As described above, the deodorant expandable resin beads of the present invention have an aqueous acrylic resin or an aqueous urethane resin (resin solid content of 40 to 40%) on the surface of the expandable styrene resin beads or the expandable polyethylene resin beads. Since the coating film is formed by mixing 0.1 to 5% by weight of the metal phthalocyanine derivative with respect to the resin solid content of 50% by weight of water and 60 to 50% by weight of water). A desired molded article can be formed by the same foam molding method as for the expandable resin beads. The foamed molded product thus obtained has the deodorant substance expanded by the foaming expansion of the beads attached to the surface thereof and exhibits an excellent deodorant effect peculiar to the metal phthalocyanine derivative.

Therefore, in addition to the above-mentioned embodiment, for example, by foam-molding into a ball having a diameter of about 3 to 5 cm, and leaving a plurality of the balls directly in the toilet bowl, they disappear while floating on water or urine. It can exert an odor effect. In addition, if a cushioning material for a helmet is molded with the deodorant expandable styrene resin beads of the present invention and is installed inside the helmet, it is useful for eliminating the sweat odor of the helmet. Furthermore, for example, a foam block having a thickness of 10 cm, a width of 30 cm and a length of 100 cm is molded with the deodorant expandable styrene resin beads of the present invention, and then the block is sliced into a thin plate, and the thin plate is used as a shoe box or the like. If it is laid on the shelf of a cooking room or the like, the odor in the shoe box or the cooking room can be eliminated or remarkably alleviated, which is useful for improving the living environment.

[Brief description of drawings]

FIG. 1 is an explanatory view of a test example of a deodorizing effect of a foamed molded product.

[Explanation of symbols]

 1. Box 2. Hole 3. Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seigo Higaki No. 1-9 Kashima, Mikawa-cho, Ishikawa-gun, Ishikawa Prefecture 9-9 Daiwabo Techno Station (72) Inventor Toshinaga Tsukijo Kashima No. 1, Mikawa-cho, Ishikawa-gun, Ishikawa Prefecture 9th 9th Diwabo Techno Station

Claims (2)

[Claims] 1. A resin of an aqueous acrylic resin or an aqueous urethane resin (emulsion having a resin solid content of 40 to 50% by weight and water of 60 to 50% by weight) on the surface of the expandable styrene resin beads or the expandable polyethylene resin beads. A deodorant expandable styrene resin bead, wherein a coating film in which 0.1 to 5% by weight of a metal phthalocyanine derivative is mixed with the solid content is formed. 2. The deodorant expandable resin beads according to claim 1 or mixed beads of the deodorant expandable resin beads and the expandable resin beads are foam-molded by a conventional method, and at least one of the foam-molded products is formed. A deodorant foamed molded article, characterized in that the deodorant coating film, which is spread by foaming expansion of beads, is attached to the surface of the part.