JP5703510B2 - Method for producing ant-proof polystyrene foam insulation - Google Patents

Description

  The present invention is an improvement of a method for producing an ant-proofing polystyrene heat insulating material, and more specifically, thermal history of primary and secondary foaming of polystyrene beads despite the small addition amount of silafluorfen as an ant-proofing agent. It is related to a novel method capable of inexpensively and efficiently producing an ant-proof foamed polystyrene heat insulating material that can effectively prevent damage to the building caused by termites, with very little removal of silafluophene during the process. is there.

  The present inventor has finally made a polystyrene resin composition containing a foaming agent by melt-kneading silafluophene and imidacloprid, and further hexabromocyclododecane as a flame retardant at a certain ratio to perform extrusion foam molding. A foam has been proposed and gained popularity (see Patent Document 1).

  The “ant-proof polystyrene resin foam” previously proposed by the present inventor is extruded from a die while being foamed in a sealed state inside the barrel of an extruder (extruder), and is quickly cooled after extrusion. Therefore, even if the molding temperature of 200 to 220 ° C. is recorded during kneading and molding, the degree to which silafluophene and imidacloprid are detached or the ant-preventive medicinal effect is reduced by thermal decomposition is negligible. Less, it was possible to provide practical use as a sufficiently molded ant-proof polystyrene foam.

  However, when manufacturing an ant-proof foamed polystyrene molded product (heat insulating material) by using a bead foam molding method in which a bead is foamed in a mold that is not hermetically sealed, the temperature recorded during the primary foaming and secondary foaming is the only temperature. Although it is low (about 125 ° C), due to the effects of the steam during heating and the expansion action of the foaming agent during molding, silafluorfen and imidacloprid, which are ant-proofing components, are easily removed from the surface, and the ant-proofing performance required for use is achieved. In order to obtain the expanded polystyrene insulation material to be exhibited, a large amount of silafluophene and imidacloprid had to be used in anticipation of the amount of separation, and the manufacturing cost was inevitably increased.

JP 2002-88185 A

  The present invention was made in view of the above-mentioned difficulties that could not be avoided in the case of producing an anti-foaming polystyrene polystyrene insulation material using silafluophene and imidacloprid as an anti-fungal agent by a conventional bead foam molding method. The purpose of this is to limit the amount of salifluophene used as the ant proofing agent to silafluophene, and to limit the amount of silafluophene to be used to the lowest possible level. Cost-effective and efficient ant-proof foam polystyrene insulation that has very little detachment of silafluophene and can effectively prevent termite damage, even if it has a history of expansion during heating and expansion during expansion. It is to provide a method that can be manufactured automatically.

  The starting point that the present inventor has solved the above problems will be described as follows. As is well known, silafluophene is provided in the form of a liquid because it is liquid and easily tolerated by organic solvents, while imidacloprid is colorless and pale yellow crystals (solid) and is in a small volume, in the form of a powder. Is provided.

  Therefore, the present inventor tried to mix the liquid silafluophene from the surface of the polystyrene beads (containing the volatile foaming agent) to the inside before and after the primary foaming or before the secondary foaming. When the beads were uniformly impregnated, and then molded into block-shaped expanded polystyrene by primary foaming or secondary foaming, the injected silafluorene was hardly retained and was stably held in the expanded polystyrene, which was unexpected. The fact that it exhibits excellent ant-preventive medicinal properties was found.

  On the other hand, imidacloprid in powder form was also mixed with polystyrene beads containing a foaming agent and subjected to primary foaming and secondary foaming to form foamed polystyrene, and imidacloprid was tested for primary foaming and secondary foaming. It became clear that it became viscous by heating at the time, and it was detached from the polystyrene beads due to the expansion action of the foaming agent, and the anti-anticide effect was extremely lowered.

  Based on such knowledge, the present inventor has mixed the liquid sylfluophene from the surface of the polystyrene beads previously processed containing the volatile foaming agent while adhering the sylfluophene, and impregnating and impregnating the sylfluophene into the inside. When the whole was molded by primary foaming and secondary foaming, we were convinced that we could mass-produce ant-proof foam polystyrene insulation material with ant-proofing medicinal properties suitable for heat insulation construction of houses, etc., and completed the present invention It came to do.

  Means adopted by the present inventor for solving the above-described problems will be described as follows.

That is, in the present invention, a liquid ant- preventive agent containing silafluophene as an active ingredient is adhered to polystyrene beads impregnated with a volatile foaming agent at a rate of 0.02 to 0.15% by weight as silafluophene. While stirring and mixing uniformly, the entire polystyrene beads are infiltrated with silafluophene and uniformly impregnated,
By heating the polystyrene beads impregnated with this ant-proofing agent, the foam is primarily foamed,
Next, the primary foamed polystyrene beads are filled into a mold of the required shape and heated to cause secondary foaming, thereby supporting the above-mentioned ant-proofing agent in the polystyrene beads and bubbles, and in a plate shape or block shape. By adopting the technical means of molding into an anti-foaming polystyrene heat insulating material, the manufacturing method was completed.

  In addition, in order to solve the above-mentioned problems, the present invention, in addition to the above-described means as necessary, from the polyethylene beads by spraying a liquid ant-preventive agent containing silafluorfen as an active ingredient on polystyrene beads. The technical means of impregnating with an anti-anticide was adopted.

Furthermore, the present invention, in order to solve the above-mentioned problems, in addition to the above-mentioned means as needed, the primary expanded polystyrene beads are transferred to an aging silo,
The primary foamed beads, which are filled with foaming agent and have a high internal pressure, get wet in water vapor and are softened, are gradually brought back to normal pressure. The technical means of raising the internal pressure of the beads to the atmospheric pressure was adopted.

  Furthermore, in order to solve the above-mentioned problems, the present invention provides a technical means for forming polystyrene beads into a plate or block shape by secondary foaming of polystyrene beads 30 to 70 times as necessary in addition to the above means. It was adopted.

  Furthermore, in order to solve the above-described problems, the present invention employs a technical means for primary foaming of polystyrene beads by steam heating in addition to the above means as necessary.

  According to the method of the present invention, a liquid and highly impregnated silafluophene is uniformly impregnated from polystyrene beads impregnated with a foaming agent as an antifungal agent, and the entire bead is impregnated with an antifungal agent so as not to be unevenly distributed. Manufactured through a process in which polystyrene beads are primary foamed by heating, and then the polystyrene beads that have undergone primary foaming are filled into a mold and heated to secondary foam and molded into an ant-proof polystyrene heat insulating material. Therefore, silafluophene is confined inside the bubbles, so that the amount of separation is extremely small, and an anti-foamed polystyrene heat insulating material can be manufactured inexpensively and efficiently.

  Moreover, the ant-proof foam polystyrene heat insulating material manufactured by the method of the present invention uses a liquid ant-proofing agent containing silafluophene as an active ingredient, and this silafluophene is impregnated with a foaming agent at the starting material stage. Since it is manufactured by infiltrating from polystyrene beads, uniformly mixing and impregnating them, and maintaining them uniformly throughout the beads, the primary foaming and secondary foaming are made into a history. Unlike ant agents, it has excellent impregnation and fixing properties, and the distribution of silafluophene in the heat insulating material is uniform throughout, providing the ant-preventive medicinal properties required anywhere in the heat insulating material and preventing homes and the like with peace of mind. It can be used for ant countermeasures.

It is a block diagram showing roughly the process of the manufacturing method of the termite-proof foam polystyrene heat insulating material concerning a 1st embodiment of the present invention. It is an expanded sectional view showing the structure of the ant-proof foam polystyrene heat insulating material concerning the present invention. It is the block diagram which represented roughly the process of the manufacturing method of the termite-proof foam polystyrene heat insulating material which concerns on 2nd Embodiment of this invention. It is the block diagram which represented roughly the process of the manufacturing method of the termite-proof foam polystyrene heat insulating material which concerns on 3rd Embodiment of this invention.

  A method for producing an ant-proof foamed polystyrene heat insulating material by applying the present invention will be described with reference to FIGS.

“First Embodiment”
First, a first embodiment of the present invention will be described. In this embodiment, polystyrene beads impregnated with a foaming agent (for example, n-pentane) are introduced into the bead / anti-antagonist impregnation tank A of FIG. 1, and in this embodiment, the polystyrene beads are stirred in this process. While spraying a liquid ant proofing agent containing silafluophene as an active ingredient, the entire polystyrene beads are uniformly infiltrated with silafluophene, which is an antproofing agent, and impregnated to the inside (hereinafter referred to as first process).

  Next, the polystyrene beads impregnated with the silafluophene liquid agent are put into the primary foaming machine B, and heated (in this embodiment, with water vapor) to be foamed. At this time, in order to uniformly foam, it is preferable to adjust the particle diameter of the beads substantially uniformly through a screen (hereinafter, abbreviated as the second process).

  Then, the primary foamed beads primarily foamed in the primary foaming machine B are transferred to the aging silo C and subjected to aging treatment. The primary foamed beads transferred to the aging silo C are initially filled with the foaming agent, and the internal pressure is high and wet in the water vapor and is softened, but gradually return to normal pressure. However, if it is allowed to cool as it is, the foaming power will be reduced during the secondary foaming in the next step, so that in the aging silo C, the air is infiltrated into the beads by making sufficient contact with the air, Increase the bubble internal pressure of the beads to atmospheric pressure. In the present embodiment, in the aged silo C, the primary foamed beads are usually left for 12 to 24 hours (hereinafter abbreviated as the third process).

  Thereafter, the primary expanded beads aged in the aged silo C are put into a secondary expanded mold D having an arbitrary shape (mainly plate-shaped or block-shaped) and heated again with steam or the like. Soften the beads. Then, the individual beads are fused to each other and formed into a necessary shape within the mold (hereinafter referred to as a fourth process).

  That is, the expanded polystyrene heat insulating material manufactured through the expanded polystyrene manufacturing process (first to fourth) shown in FIG. 1 has a liquid anti-anticide 2 containing silafluophene as an active ingredient, as shown in FIG. Since it is uniformly impregnated with the polystyrene beads 1 infiltrated, it becomes a heat insulating material in which silafluophene is confined in the open cell (open cell) structure bubbles 11 formed on the surface and inside of the expanded polystyrene. Thus, it has a function as an excellent ant-preventing heat insulating material that exhibits ant-repellent medicinal effects over a long period.

“Second Embodiment”
Next, a second embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 3, while the polystyrene beads are impregnated with the volatile foaming agent in the first process, the liquid ant-repellent agent 2 containing silafluophene as an active ingredient is adhered to the beads, and the mixture is stirred all the time. The polystyrene beads 1 are heated to form a primary foam (second process) while the polystyrene beads are uniformly impregnated by infiltrating the entire polystyrene beads by mixing (second process). It is to be carried.

  Even in the mixing of the ant-preventing agent 2 at this timing, the polystyrene bead 1 can be surely impregnated with the liquid ant-preventing agent 2 and is excellent by passing through the same third and fourth processes as described above. A heat insulating material having an ant-proof effect can be produced.

“Third embodiment”
A third embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 4, the polystyrene beads impregnated with the volatile foaming agent in the first process and the second process are primarily foamed by heating,
Liquid anti-anticide 2 containing silafluophene as an active ingredient at the timing immediately before filling the form-molded polystyrene beads into the mold of the required shape and heating and secondary foaming (before the fourth process) By uniformly stirring and mixing, the entire polystyrene beads are impregnated with silafluophene and uniformly impregnated, whereby the polystyrene beads 1 and the antifungal agent 2 are supported in the bubbles.

  Even if the mixture of the ant-preventing agent 2 at this timing, the polystyrene bead 1 can be surely impregnated with the liquid ant-preventing agent 2, and an excellent ant-preventing effect can be obtained through the same fourth process as described above. The heat insulating material which has can be manufactured.

By the method in which the inventor performs each manufacturing process of the above-described embodiment, the ant-proof foamed polystyrene heat insulating material of the present invention (Example 1, Example 2);
A foamed polystyrene heat insulating material (Comparative Example 1) produced by adding silafluorene to polystyrene beads in a proportion of less than 0.02% by weight;
Each of the foamed polystyrene heat insulating materials (Comparative Example 2) containing no silafluophene was made as a trial product, and the results were compared as follows.

(1) Example 1
5 kg of polystyrene beads containing a foaming agent (n-pentane) (Kaneka: Kanepal VF-L) and 50 g of an anti-anticide containing 15% by weight of silafluophene (Dainipaku Insect Chrysanthemum Co., Ltd .: Kintori Shironen Emulsion) 1, in the polystyrene foaming equipment bead / ant-proofing agent impregnation tank A, the first process is performed, and then the second process, the third process, and the fourth process are performed, and the expansion ratio is 30 times and 50 times. Five 70-fold plate-like expanded polystyrene heat insulating materials (thickness: 5 cm, width: 20 cm, length: 50 cm) were molded.

(2) Example 2
5 kg of polystyrene beads containing a foaming agent (n-pentane) (Kaneka: Kanepal VF-L) and 25 g of an anti-anticide containing 15% by weight of silafluophene (Dainipaku Insect Chrysanthemum Co., Ltd .: Kintori Shironen Emulsion) The first process is performed by the bead / anti-anticide impregnation tank A of the polystyrene foaming equipment shown in FIG. 1, and then the second process, the third process, and the fourth process are performed, and the expansion ratio is 30 times, 50 times, and 70. Five double plate-like expanded polystyrene heat insulating materials (thickness: 10 cm, width: 20 cm, length: 50 cm) were molded.

(3) Comparative Example 1
5 kg of polystyrene beads (Kaneka: Kanepal VF-L) containing a foaming agent (n-pentane) and 5 g of an anti-anticide containing 15% by weight of silafluophene (Dainipaku Insect Chrysanthemum Co., Ltd .: Kintori Shironen Emulsion) The first process is performed by the bead / anti-anticide impregnation tank A of the polystyrene foaming equipment shown in FIG. 1, and then the second process, the third process, and the fourth process are performed, and the expansion ratio is 30 times, 50 times, and 70. Five double plate-like expanded polystyrene heat insulating materials (thickness: 10 cm, width: 20 cm, length: 50 cm) were molded.

(4) Comparative Example 2
5 kg of polystyrene beads (Kaneka: Kanepal VF-L) containing a foaming agent (n-pentane) are put into the beads / anticide-preventing agent impregnation tank A of the polystyrene foaming equipment shown in FIG. Then, the second process, the third process, and the fourth process are performed, and a foamed polystyrene insulation material having a foaming ratio of 30 times, 50 times, and 70 times (thickness: 10 cm, width: 20 cm, length) : 50 cm).

  First, the samples (30 × 30 × 20 cm) obtained in the above “Example 1”, “Example 2”, “Comparative Example 1”, and “Comparative Example 2” were cut into a rectangular parallelepiped shape and placed in a petri dish. Then, 300 petite ants and 30 soldier ants were placed in each chalet and observed for 21 days. The following results were obtained.

  Next, the rectangular parallelepiped samples (20 × 30 × 30 cm) of “Example 1”, “Example 2”, and “Comparative Example 1” were placed in a warmer for 30 days at a temperature of 60 ° C. After heating, the volatilization promotion test of silafluophene (corresponding to the passage of 30 years at room temperature) was conducted, and the above-mentioned ant-proof test was performed using these samples, and the following results were obtained.

  In view of the results of the above-mentioned [Table 1] and [Table 2] ant-proof tests, the present inventor found that the ant-proof performance of the foamed polystyrene heat insulating materials of “Example 1” and “Example 2” according to the present invention is as follows. We decided that it was possible to protect wooden houses from termite damage for 30 years. In addition, it was confirmed that there is almost no difference depending on the foaming ratio (30 times, 50 times, 70 times) of the sample according to “Example 1”.

  As described above with reference to the examples, the ant-proof polystyrene foam insulation material provided by the method of the present invention can effectively insulate a building such as a house built using wood. It is possible to protect the building from termite damage for a long period of time, and because there is very little silafluophene used as an active ingredient for ant protection performance, it must be manufactured inexpensively and efficiently. Can do.

A Bead / Anti-antibiotic impregnation tank B Primary foaming machine C Aging silo D Secondary foaming form 1 Polystyrene beads
11 Air bubbles 2 Anti-anticide

Claims (5)

A liquid anti- anticide containing silafluophene as an active ingredient is attached to polystyrene beads impregnated with a volatile foaming agent at a rate of 0.02 to 0.15% by weight, and stirred and mixed universally. By making the entire polystyrene beads infiltrate with silafluophene and uniformly impregnating,
By heating the polystyrene beads impregnated with this ant-proofing agent, the foam is primarily foamed,
Next, the primary foamed polystyrene beads are filled into a mold of the required shape and heated to cause secondary foaming, thereby supporting the above-mentioned ant-proofing agent in the polystyrene beads and bubbles, and in a plate shape or block shape. A method for producing an ant-proof foamed polystyrene heat insulating material, characterized in that it is molded into a mold. 2. The ant-proof foamed polystyrene heat insulating material according to claim 1 , wherein the polystyrene beads are impregnated with the ant-proofing agent from the polyethylene beads by spraying a liquid ant-proofing agent containing silafluophene as an active ingredient. Manufacturing method. Transfer the primary expanded polystyrene beads to the aging silo,
The primary foamed beads, which are filled with foaming agent and have a high internal pressure, get wet in water vapor and are softened, are gradually brought back to normal pressure. 3. The method for producing an ant-proof foamed polystyrene heat insulating material according to claim 1, wherein the internal pressure of bubbles in the beads is increased to atmospheric pressure. The method for producing an ant-proof foamed polystyrene heat insulating material according to any one of claims 1 to 3 , wherein the polystyrene beads are secondarily foamed 30 to 70 times and formed into a plate shape or a block shape. . The method for producing an ant-proof polystyrene heat insulating material according to any one of claims 1 to 4 , wherein the polystyrene beads are primarily foamed by steam heating.