JP2000015709A - Functional foamed plastic molded article and method for producing the same - Google Patents

Abstract

(57) [Summary] [Problem] Functions such as insect repellent effect, mold repellent effect, or antibacterial effect can be expected without harming humans such as workers and residents, and the function such as insect repellent effect is aging. To provide a functional foamed plastic molded product that is difficult to disappear. SOLUTION: Hinokitiol is adhered to the surface of primary foamed foam particles 2 and the foamed particles are secondarily foamed in a molding die to obtain a thick plate-shaped insect-proof foamed plastic molded product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, building forms,
The present invention relates to a foamed plastic molded article suitable for building materials such as flooring and heat insulating material, a fish box for storing fresh fish, a pass box for storing fruits and vegetables, and a method for producing the same.

[0002]

2. Description of the Related Art A foamed plastic molded product is used in various fields, and a conventional technology will be described by taking a building material as a typical example.

[0003] Recent houses provide a comfortable indoor environment by using a heat insulating material or a pair of glass to improve the airtightness and heat insulation of the house, thereby keeping the indoor temperature environment constant. As a result, energy saving effect, prevention of dew condensation, and improvement in durability of the house are achieved. However, in order to keep the indoor temperature environment constant, on the other hand, molds, mites, cockroaches, and the like are easily generated. For this reason, countermeasures such as applying a fungicide or an insect repellent to building materials such as a base material and a heat insulating material are taken. In order to protect the houses from termites and the like, bases and pillars are also sprayed with termiticides to take measures.

[0004]

However, since the insect repellent treatment for applying an insect repellent or the like to building materials is performed at the construction site, the working environment is poor. In addition, since a step of drying the insect repellent or the like is required, the operation is complicated. Furthermore, since the insect repellent and the like are applied to the surface of the building material, the effect of the insect repellent and the like may be lost over time or the insect repellent effect may be lost due to a physical change when the building material surface is damaged by a mouse or the like. Was.

[0005] Also, because the airtightness of the house has been improved,
Chemical substances released from building materials such as fungicides, insect repellents, and plywood do not float outside the room and are not exhausted outside the room. "Sick house syndrome", which manifests itself, is a problem. For this reason, there is a demand for the development of a building material that does not contain a chemical substance or a building material that does not harm humans and has an effect of preventing insects and the like.

[0006] Further, effects such as mold prevention and antibacterial properties are not limited to building materials. For example, in recent years, fish boxes, fruit and vegetable boxes, and the like, have been widely required to have effects such as insect repellent, fungicide, and antibacterial as effects or functions added to the original functions of the objects.

[0007] Hinokitiol has attracted attention as a drug that can be expected to have functions such as insect repellent, fungicide, and antibacterial.
However, since this hinokitiol has sublimability, simply applying it to the surface has poor durability and cannot be put to practical use. For this reason, the function cannot be sustained unless it is put in starchy microcapsules or activated carbon is used as a holding material. However, placing hinokitiol in a starchy microcapsule or using activated carbon as a holding material complicates the production, and is contrary to labor saving and rationalization.

Therefore, the present invention can be expected to have a function such as an insect repellent effect, a fungicide effect, or an antibacterial effect without harming humans such as workers and occupants. It is an object of the present invention to provide a functional foamed plastic molded product which is difficult to disappear and a method for producing the same.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object. According to the present invention, there is provided a method for forming foamed plastic particles having a drug mainly composed of hinokitiol on a surface thereof. A functional foam plastic molded article characterized in that the surface portions of the foam particles are fused and integrated by heating in a mold, and that hinokitiol is held in the fine voids between adjacent foam particles. is there.

[0010] According to a second aspect of the present invention, a plastic bead containing a foaming agent is heated and foamed to a predetermined magnification.
A secondary foaming step, a drug adhering step of adhering a drug containing hinokitiol as a main component to the surface of the primary foamed plastic foam particles, and filling and heating the foam particles having hinokitiol adhered into a mold. A secondary foaming step of performing secondary foaming and molding into a predetermined shape, and holding hinokitiol in fine voids between adjacent foamed particles;
This is a method for producing a functional foamed plastic molded product, which is molded through the following.

According to a third aspect of the present invention, a plastic bead containing a foaming agent is heated and foamed to a predetermined magnification, and a drug mainly composed of hinokitiol is attached to the surface of the foaming particles. The foaming particles after the primary foaming agent adhering step and the primary foaming agent adhering step are filled in a mold and heated to form secondary foam to form a predetermined shape. And a secondary foaming step of retaining hinokitiol in the fine voids.

According to a fourth aspect of the present invention, there is provided a drug adhering step of adhering a drug mainly composed of hinokitiol to the surface of a plastic bead containing a foaming agent, and heating the plastic bead having the drug adhering to the surface. A primary foaming step of foaming to a predetermined magnification, and filling and heating the foamed foam into a molding die to form the foam into a predetermined shape by secondary foaming, and fine voids between adjacent foamed grains. And a secondary foaming step in which hinokitiol is retained in the molded article.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an insect-resistant foamed plastic molded article 1 described as a first embodiment of the present invention. FIG. 2 shows an insect repellent 3 on the surface of the primary expanded foam 2.
FIG. 6 is a cross-sectional view showing a state where is attached. FIG. 3 is a cross-sectional view of a molding die for secondary foaming and molding the foamed particles 2 having the insect repellent adhered to the surface.

This insect-resistant foamed plastic molded article 1 is
A hinokitiol solvent as a chemical agent (insect repellent) is applied to the surface of the primary foamed (pre-foamed) plastic foam particles 2 by spraying or the like, and the foam particles 2 are secondarily foamed. It is molded into a plate shape that is easy to process and can be used as a heat insulating material for building foundations.

The expanded beads 2 are heated with steam or the like while stirring plastic beads such as expandable polystyrene beads containing a blowing agent such as butane or pentane (90 to 1).
05 ° C) and foamed to a desired magnification (primary foaming step), and then matured. As shown in FIG. 2, the inside of the granules is generated by a foaming gas such as butane or pentane generated by heating. Are formed in a state where countless fine closed cells are combined. In this primary foaming step, the foaming ratio can be appropriately adjusted in the range of about 20 to 90 times by controlling the steam heating time, and the apparent magnification of the primary expanded particles becomes equal to the actual magnification of the molded product. I have. Aging is a process of allowing air to penetrate into air bubbles by allowing the primary expanded granules 2 to be used for molding to raise the internal pressure to atmospheric pressure.

Then, hinokitiol, which is a main component, is attached to the surface of the foamed particles 2 by spraying or applying a solution of the insect repellent 3 to the foamed particles 2 (drug adhering step). The method of attaching the insect repellent 3 to the surface of the foamed particles 2 is not limited to the above-described spraying and application, and any method may be used as long as the foamed particles 2 can have the insect repellent 3 on the surface. It may be immersed in a tank in which the solution is stored and adhered. As described above, when the insect repellent is attached to the surface of the foamed particles, the insect repellent is mixed into the plastic bead material itself, and then the primary and repellents are mixed.
A smaller amount of insect repellent is used than in the case of secondary foaming.

In order to form the foamed particles 2 having been subjected to the drug adhering step into a desired shape, as shown in FIG.
The foamed particles 2 filled into the cavity 6 of the mold 5 by the filling gun 4 and air transport, then as shown in FIG. 3 (b), the 0.6~1,2kg / cm ² as a heat source Water vapor is blown to soften the foamed particles 2 to cause secondary foaming (secondary foaming step). In the secondary foaming step, the surface portions of the foamed grains 2 are fused together by the expansion pressure of the foamed grains and the softening of the surface of the foamed grains, and are integrated into the shape of the cavity 6. At this time, the gap between the adjacent foamed particles 2 is crushed and molded into the shape of the cavity 6 as a whole. However, the gap between the adjacent foamed particles 2 is not completely crushed. As shown in (1), fine voids 7 remain, and the insect repellent 3 is held in the fine voids 7. In particular, the fine voids 7 are likely to remain at a portion where three or more expanded particles 2 are joined, and a relatively large amount of the insect repellent 3 is held at this portion. Also, the insect repellent 3 is held on the joint surface of the fused foam particles 2. The fusion strength between the surface portions of the foamed particles 2 and the size of the fine voids 7 between the foamed particles 2 can be appropriately adjusted by controlling the heating temperature and the expansion pressure during the steam heating time.

When the expanded particles 2 are fused, as shown in FIG. 3 (c), cooling is performed by passing cooling water through a molding die 5, and then the mold is released.

As described above, in this embodiment, since the insect repellent 3 is attached to the foamed particles 2 and then molded as a final molded product, it can be molded into a desired shape according to the application. Therefore, the present invention can be applied not only to the thick plate shape shown in the drawings but also to a wide range of applications by being molded into various shapes.

Further, since each of the foamed particles 2 constituting the molded article 1 is subjected to insect repellent treatment, in other words, not only the surface of the molded article 1 but also the surface of the foamed particles 2 existing inside the molded article 1 Has an insect repellent effect, so that even if a process such as cutting is performed to make the molded article 1 into a predetermined shape, the insect repellent effect is generated on the cut surface. Since the insect repellent 3 exists not only on the surface of the molded article 1 but also inside the molded article 1, it is possible to prevent the insect repellent effect from deteriorating over time, and it is not necessary to perform the insect repellent treatment at the work site. .

The insect repellent 3 attached to the surface of the foamed particles 2
A solvent containing hinokitiol as a main component is used.

The solvent mainly composed of hinokitiol is
Hinokithiol is dissolved in alcohol or the like to make it water-soluble and adjusted to a predetermined concentration. Hiba oil containing hinokitiol is adjusted to a predetermined concentration, and Hiba distillate containing hinokitiol.

Hinokitiol has the chemical name "4-isopropyl-2-hydroxy-2,4,6-cycloheptatrien-1-one" and is a phenolic substance having a special structure of a 7-membered ring. is there. This hinokitiol is
It is contained in the wood of the cypress family Asunaro genus, Rats genus, Black genus, Incense cedar genus, Hinoki genus,
These woods are obtained by isolating them from oil refinements (eg, hiba oil) obtained by steam distillation.

An oil refined by steam distillation of Aomori Hiba, a Japanese cypress family belonging to the genus Asunaro belonging to the genus Asunaro, is also referred to as Hiba oil. This Hiba oil is an extremely excellent natural product. It contains about 2% hinokitiol, which has antibacterial properties. In addition, there is Hiba distillate which is distilled together with Hiba oil when extracting Hiba oil by steam distillation. This Hiba distillate is distilled about 100 times as much as Hiba oil during steam distillation, and mainly contains an acidic oil component in Hiba oil, and also contains 100 ppm of hinokitiol.

It is known that hinokitiol has functions such as an antibacterial effect, a tranquilizing effect, and a deodorizing / deodorizing effect, in addition to insect repellent effects.

As an insect repellent effect, a very effective insecticidal activity against termites has been recognized, and a repellent effect against mosquitoes and cockroaches has also been confirmed.

The antibacterial effect is characterized by an extremely broad antibacterial spectrum, a particularly high activity against fungi and rot fungi, and the exclusion of resistant bacteria. . Therefore, when it is molded into a packaging material such as a box, it can be used as a fish box used for transporting fresh fish or a pass box for putting fruits and vegetables such as vegetables and fruits. When used as a fish box, the generation of odor peculiar to fish can be suppressed, and rot can be suppressed in any case. Also, when molded into a marine product such as a float, the adhesion of algae can be reduced.

As a tranquilizing effect, the fragrance of hinokitiol acts to relieve stress, as is known in forest bathing. Therefore, it is preferable to use the foamed plastic molded product according to the present invention as a heat insulating material for buildings. In an experiment using rats, rats that did not eat food in the stressed state given an electric shock were given, for example, hiba oil (containing hinokitiol), and the stress was reduced and they began to eat food. (“Hiba oil presentation effect on psychological stress caused by electric shock warning signal in rats”, Mokuzai Gakkaishi, 38 (1
2) 1105-1110 (1992)).

As the deodorizing / deodorizing effect, since the propagation of various bacteria is prevented by the antibacterial effect, there is an effect of preventing bad odor from the various bacteria, and in addition, there is an effect of eliminating an unpleasant odor by a unique fragrance of a tree. Also in this respect, it is suitable for a fish box.

Then, hinokitiol was used as an insect repellent 3 for building materials.
When used as a material, an effective effect when used as a building material is added in addition to the insect repellent effect as described above.

Hinokitiol, which exerts such a medicinal effect, has sublimability as an important feature. For this reason, when using hinokitiol, it has been said that it is necessary to select a holding material suitable for a period in which the effect of hinokitiol is required.

However, the insect-resistant foamed plastic molded article 1 of the present embodiment is formed by secondary foaming the foamed particles 2 having hinokitiol adhered to the surface thereof. The existing fine voids 7 and expanded particles 2
Hinokitiol is held at the joint surface between the two. Therefore, hinokitiol can be held for a long period of time without using a separate holding material.

That is, the insect-resistant foamed plastic molded article 1 is obtained by adhering a solvent containing hinokitiol as a main component to the surface of the primary foamed foamed grains 2 and secondary foaming the foamed grains 2 to form a molded article. In addition, these foamed particles 2 are also characterized as functioning as a holding material for hinokitiol.

According to the experiment, hiba oil diluted 500 times was applied to the surface of the foamed particles 2 by applying or spraying,
Using the foamed particles 2, an insect-resistant foamed plastic molded article 1 is formed.
When 10 termites were released on the top, 2 died 2 days later, 5 died 3 days later, 6 died 4 days later and 7 died 6 days later. In the case of Hiba oil diluted 300 times, 3
One day later and four days later, four died. On the other hand, in the case of Hiba oil diluted 1000 times, one animal died 4 days later.
It is therefore desirable to use hiba oil diluted up to 500 times from this experiment. Since hinokitiol exerts its effect in a small amount, Hiba distillate can be used instead of Hiba oil.

As described above, the insect-resistant foamed plastic molded article 1 is highly safe for residents because it uses hinokitiol as the insect-controlling agent 3, and additionally uses water as a solvent for hinokitiol. No chemicals are released from the solvent.

In the above embodiment, the case where the insect-resistant foamed plastic molded article 1 is mainly used as a building material has been described, but the invention is not limited to this. That is, in the above embodiment, the building material was formed by molding into a thick plate,
By changing the design according to the purpose and appropriately utilizing the medicinal properties of hinokitiol attached to the foamed particles 2, molded articles for various uses can be provided. For example, when molded as a heat insulating material provided in an air conditioner, a fungicidal effect due to hinokitiol can be expected in addition to the heat insulating effect.

In the above-described embodiment, the agent containing hinokitiol as the main component is adhered to the surface of the foamed particles 2 which have been subjected to the primary foaming. What is necessary is just to have a medicine on the surface of the foaming particle 2.

Therefore, a drug mainly composed of hinokitiol may be attached to the surface of the expandable plastic beads (drug attachment step), and then primary foaming (primary foaming step) may be performed. (Secondary foaming step) is the same as described above. As described above, if the drug is attached at the stage of the plastic beads before the primary foaming, the treatment can be performed with a small volume, so that the drug attaching step is easy.

Further, a medicine may be adhered at the time of primary foaming. That is, a plastic foam containing a foaming agent is heated and foamed at a predetermined magnification, and a primary foaming drug adhering step of adhering a drug containing hinokitiol as a main component to the surface portion of the foaming particles is performed, The foamed particles having undergone the primary foaming agent adhering step are filled in a mold and heated to form secondary foam to form a predetermined shape and to retain hinokitiol in the fine voids between adjacent foamed particles. A functional foamed plastic molded article may be manufactured by performing a secondary foaming step. In order to attach the medicine to the particles being foamed when performing the primary foaming, the medicine may be contained in steam supplied to the foaming tank for heating, or the medicine may be separately prepared from the steam. It may be sprayed inside. In the above embodiments, natural hinokitiol or hiba oil was used, but the hinokitiol of the present invention may be chemically synthesized.

[0040]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the foamed plastic particles having a drug containing hinokitiol as a main component on the surface thereof are heated in a mold so that the foamed particles are fused and integrated with each other. Since the hinokitiol is retained in the fine voids, the amount of valuable hinokitiol used can be reduced. In addition to being able to be molded into the desired shape, the molded product itself has the medicinal properties of hinokitiol, such as insect repellent, antibacterial, deodorant and deodorant, and is highly safe for human beings, so it can be used for a wide range of applications. It is not necessary to perform a treatment such as chemical spraying, so that the working environment can be prevented from deteriorating. In addition, since hinokitiol is also held inside the molded product, even if processing such as cutting is performed to make the molded product into a predetermined shape, the medicinal effect of hinokitiol occurs on the cut surface and the medicinal effect of hinokitiol over time Loss can be prevented. And, since it is held in the fine voids between adjacent foamed particles, even if it is hinokitiol which has a problem in durability because it has sublimation properties, it can prevent its medicinal properties from disappearing over time, and for many years Can withstand use.

According to the second aspect of the present invention, a drug adhering step of adhering a drug containing hinokitiol as a main component to the surface of the primary foamed plastic foam particles, and placing the foam particles having hinokitiol adhered in a molding die. Filling and heating to form a secondary shape by secondary foaming,
Molding through the secondary foaming step of retaining hinokitiol in the fine voids between adjacent foamed particles facilitates production of highly durable foamed plastic molded products that can exert the medicinal properties of hinokitiol over a long period of time. can do.

According to the third aspect of the present invention, the plastic beads containing a foaming agent are heated to foam at a predetermined magnification, and a drug mainly composed of hinokitiol is attached to the surface of the foaming particles. The foaming particles after the primary foaming agent adhering step and the primary foaming agent adhering step are filled in a mold and heated to form secondary foam to form a predetermined shape. Since the molding is performed through a secondary foaming step of retaining hinokitiol in the fine voids, the operation of adhering the medicine can be performed separately from other steps, so that the manufacturing process can be streamlined.

According to the fourth aspect of the present invention, the primary foaming step is performed after the drug attaching step of attaching a drug containing hinokitiol as the main component to the surface of the expandable plastic beads. Since the drug is attached at the stage of the plastic beads, the treatment can be performed in a small volume state, so that the drug attaching step is easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of an insect-resistant foamed plastic molded product according to the present invention.

FIG. 2 is a cross-sectional view showing a state where an insect repellent is attached to the surface of the foamed particles.

FIGS. 3A and 3B are cross-sectional views of a mold in which foam particles having an insect repellent adhered to the surface are placed, wherein FIG. 3A is a cross-sectional view in which foam particles are filled, and FIG. FIG. 3C is a cross-sectional view illustrating a state where cooling water is supplied and cooled.

[Description of Signs] 1 Insect repellent foamed plastic molded product 2 Expanded granules 3 Insect repellent (hinokitiol) 4 Filling gun 5 Mold 6 Cavity 7 Micro void

Claims (4)

[Claims] 1. A plastic foam having a drug mainly composed of hinokitiol on its surface is heated in a mold to fuse and integrate the surface portions of the foam with each other. A functional foamed plastic molded article characterized in that hinokitiol is retained in the fine voids. 2. A primary foaming step of heating plastic beads containing a foaming agent and foaming the beads at a predetermined magnification, and a drug for attaching a drug mainly composed of hinokitiol to the surface of the primary foamed plastic foam particles. An adhering step, filling the foamed particles with the attached hinokitiol into a mold and heating to form the foam into a predetermined shape by secondary foaming, and to hold the hinokitiol in the fine voids between adjacent foamed particles 2 A method for producing a molded article of a functional foamed plastic, which is molded through a next foaming step. 3. A primary foaming agent adhering step of heating a plastic bead containing a foaming agent to foam the beads at a predetermined magnification and adhering a drug mainly composed of hinokitiol to a surface portion of the foaming particles. The foamed particles after the primary foaming agent adhering step are filled in a mold and heated to form secondary foam by molding and hold hinokitiol in the fine voids between adjacent foamed particles. And a secondary foaming step of performing molding. 4. A drug adhering step of adhering a drug mainly composed of hinokitiol to the surface of a plastic bead containing a foaming agent, and heating the plastic bead having the drug adhering to the surface to foam at a predetermined magnification. A secondary foaming step, in which the primary foamed foam particles are filled in a mold and heated to form a predetermined shape by secondary foaming, and hinokitiol is held in the fine voids between adjacent foamed particles 2 A method for producing a molded article of a functional foamed plastic, which is molded through a next foaming step.