JP4777330B2 - Insect-proof insulation manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing an insect-proof heat insulating material .

  In recent years, as a heat insulating material used for heat insulation of a house, etc., an insect repellent comprising a foam such as a polyurethane foam having an insect repellent coating film surface on the surface side, and a foam such as a polyurethane foam mixed with an insect repellent inside. Insect repellents with performance have been proposed.

  However, in the insect repellent insulation material having the former insect repellent coating film surface, simply applying the insect repellent to the foam surface to form the paint film surface, so while the paint film surface exists Appropriate insect repellent effect (specifically, effect to prevent white ants from eating damage, etc.) can be obtained, but the coating surface is reduced as the insect damage (white ants) progresses and damage over time. There was a problem of lack of durability.

  On the other hand, in the case of the insect-insulating heat insulating material composed of a foam in which an insect repellent is mixed in the latter, a powder raw material liquid such as polyurethane raw material liquid is mixed with a powder or oily liquid insect repellent at room temperature, and the insect repellent is contained. The foaming raw material liquid is stirred to prepare an insecticide-containing raw material liquid, and foam molding is performed using the raw material liquid. However, when a powdery insect repellent is mixed, it is difficult to disperse the insect repellent uniformly in the foaming raw material liquid, and the resulting foam is unevenly distributed with the insect repellent, so that a sufficient insect repellent effect cannot be obtained. There is a fear. Furthermore, if the amount of the powdered insect repellent is increased in order to enhance the insect repellent effect, the powdered insect repellent will be unevenly distributed in the foaming raw material liquid and foaming will not be performed well. Cannot be obtained. In addition, when the insect repellent is mixed with an oily liquid at room temperature, the insect repellent in the repellent heat insulating material is liquid at room temperature at which the obtained insect repellent heat insulating material is used. There is a problem that a good insecticidal effect cannot be obtained over a long period of time.

  When the insect repellent is mixed into the foam, as in the invention described in JP-A-6-294165, toluene or the like is used as a solvent for the insect repellent when preparing the insect repellent-containing raw material liquid. In such a case, however, foaming of the foam of the urethane foam may occur due to the toluene or the like, and the foam may become rough, which may hinder the original function as a heat insulating material. Moreover, when the said heat insulating material with which toluene etc. remain | survive in foam | foam is used for a private house, a commercial building, etc., there is a concern about an environmental pollution and an influence on a human body.

The present invention has been proposed in view of the above points, and is an insect repellent insulation material in which an insect repellent is uniformly dispersed in a foam without using a solvent, and a sufficient insect repellent effect can be obtained over a long period of time . A manufacturing method is to be provided.

The method for producing an insect-insulating heat insulating material according to claim 1 is a method for producing an insect-insulating heat insulating material by foam molding performed by mixing a plurality of foaming raw material liquids, wherein the plurality of foaming raw material liquids include a polyol component. It consists of a foaming raw material liquid and an isocyanate side foaming raw material liquid containing an isocyanate component, and an insect repellent having a melting point of 35 ° C. to 150 ° C. is mixed in at least one of the polyol side foaming raw material liquid and the isocyanate side foaming raw material liquid , and thereafter The insecticide is heated and melted to prepare an insecticide-containing raw material solution, and then the insecticide-containing raw material solution is mixed with another foaming raw material solution to perform foam molding.

In the insect repellent heat insulating material manufactured by the invention of claim 1, since the insect repellent is dispersed in the foam without being unevenly distributed, the insect repellent effect can be sufficiently exhibited and the insect repellent effect can be exhibited over a long period of time. Can be maintained. Moreover, the insect repellent is solid at room temperature where the insect repellent heat insulating material is used, and there is little wasteful reduction due to evaporation, and thereby a good insect repellent effect can be maintained over a long period of time.

According to the invention of claim 1, since the insect repellent-containing raw material liquid is prepared by heating and melting the powder insect repellent, it is extremely possible to use a solvent such as toluene as described in the prior art column. The insect repellent can be easily dispersed uniformly in the raw material liquid, and the insect repellent is not unevenly distributed in the molded foam, but the foam repellent is mixed and dispersed as a liquid by melting so that poor foaming occurs. It is hard to occur. In addition, the obtained insect-insulating material has a good insect-proofing effect over a long period of time .

The insect-proof heat insulating material manufactured by the invention of claim 1 is used as a heat insulating material for a house or the like, and is made of a foam formed by foaming using a foam raw material liquid. And in this insect repellent heat insulating material, the insect repellent whose melting | fusing point is 35 degreeC-150 degreeC is disperse | distributing in the said foam, and the insect repellent effect | action which controls the damage by a white ant, etc. is provided.

  The said foaming raw material liquid is conventionally used for this kind of heat insulating material, Comprising: The polyol side foaming raw material liquid (common name A liquid) containing a polyol component and the isocyanate side foaming raw material liquid (common name B liquid) containing an isocyanate component In general, it is a two-component solution.

  Either or both of polyether polyol and polyester polyol are used as the polyol component, but the main polyol is preferably a short-chain polyfunctional and has a hydroxyl value of 250 to 450 KOHmg / g. . In addition, a catalyst, a foaming agent, a foaming agent, a flame retardant, a plasticizer, etc. are suitably added to this polyol component.

  As the isocyanate component, toluene diphenyl diisocyanate (TDI) prepolymer, methylene diphenyl diisocyanate (MDI), crude MDI, polymeric MDI, uretdione-modified MDI, carbodiimide-modified MDI and the like are used.

  The foam obtained from the above foaming raw material liquid is preferably a polyurethane rigid foam in a broad sense, and specifically includes polyurethane foam, urethane-modified isocyanurate foam, urea foam, and the like.

  The insect repellent is present in a solid state at normal temperature (5 ° C. to less than 35 ° C.) and can be melted at least at a decomposition temperature (150 ° C.) or less of the polyol. That is, in the insect repellent of the present invention, the melting point is set to 35 ° C to 150 ° C. More preferably, an insect repellent having a melting point of 50 ° C. to 90 ° C. lower than the reaction temperature (about 140 ° C.) at the time of foaming is preferably used in order to foam the foaming raw material liquid satisfactorily. Specifically, as the insect repellent, 2- (4-ethoxyphenyl) -2-methylpropyl-3-phenoxybenzyl ether [melting point: 37.0 ° C., common name: etofenprox], α-cypermethrin [melting point : 82.5 ° C], bifenthrin [melting point: 61.0 ° C], chlorpyrifos [melting point: 42.0 ° C], 0,0-dimethyl-0-3,5,6, -trichloro-2-pyridyl phosphorothioate [melting point : 45.5 ° C., common name: chloropyrifosmethyl] and the like.

  As will be described later, this insect repellent is mixed in at least one liquid prior to foam molding using the foaming raw material liquid. The amount of the insect repellent added (mixed amount) is determined in consideration of the effectiveness of the insect repellent effect, the burden on the stirring device used during stirring, the viscosity of the raw material liquid after mixing the insect repellent (the handleability of the raw material liquid), etc. It is done. Specifically, the addition amount of the insect repellent is about 0.05 to 30.0 parts by weight with respect to 100 parts by weight of the polyol component.

Next, an example of the manufacturing method of the said insect-proof heat insulating material is demonstrated.
First, the powder insect repellent is mixed with at least one liquid of the foaming raw material liquid, in this example, the polyol component side foam raw material liquid, and the insect repellent is melted and stirred to obtain a molten insect repellent. A uniformly dispersed insecticide-containing raw material solution is prepared. In addition, the melting of the insect repellent may be performed by mixing the insect repellent in a foaming raw material liquid that has been heated to a melting point or higher of the insect repellent in advance, or after mixing the insect repellent into the foam raw material liquid. You may carry out by heating the foaming raw material liquid.

  Next, the insect repellent-containing raw material liquid is cooled to a predetermined temperature, preferably rapidly cooled, so that the insect repellent is recrystallized to obtain a foam raw material liquid in which the insect repellent is dispersed in a fine crystalline state. The cooling temperature of the insect repellent-containing raw material liquid is set equal to the mixing temperature for mixing the insect repellent-containing raw material liquid described later and another foaming raw material liquid in consideration of the efficiency of foam molding and the like. Is desirable.

  Thereafter, the raw material liquid in which the insect repellent is dispersed in a fine crystalline state is mixed with another foaming raw material liquid, in this example, the isocyanate component side foaming raw material liquid, and foam molding is performed according to known methods and conditions, An insect-insulating heat insulating material made of a foam in which an insect-repellent is dispersed can be obtained.

Among the examples of the present invention, particularly typical ones are shown below.
Examples 1 and 2
100 parts by weight of an aromatic polyester polyol (hydroxyl value: 450), 2.5 parts by weight of powdered etofenprox (manufactured by Mitsui Toatsu Co., Ltd.) as an insect repellent as Example 1 and 5.0 parts by weight as Example 2 A portion was added, and this was put into a propeller stirrer equipped with a jacket type temperature control equipment, heated to 70 ° C. and stirred for 20 minutes. After confirming that etofenprox is melted and the polyol mixed solution (insecticide-containing raw material solution) becomes transparent, 1.5 wt.% Of a foam stabilizer (dimethylpolysiloxane modified) is added to the polyol mixed solution. Part, 1.5 parts by weight of catalyst (dimethylcyclohexylamine) and 3 parts by weight of water as a blowing agent were added and stirred for another 20 minutes. Thereafter, the mixed solution was cooled to room temperature to recrystallize the insect repellent, thereby preparing a polyol-side foaming raw material solution.

  On the other hand, an isocyanate-side foaming raw material liquid made of polymeric MDI (manufactured by Nippon Polyurethane Industry Co., Ltd., MR200) adjusted to a temperature of 10 ° C. as an isocyanate is 128 parts by weight with an isocyanate index 105, and the polyol side It discharged on the double conveyor with the foaming raw material liquid, and obtained the insect-proof heat insulating material.

Examples 3 and 4
In Example 1 or 2, 0.5 parts by weight or 1.0 part by weight of α-cypermethrin 94.3% (manufactured by Nippon Cyanamid Co., Ltd.) as an insect repellent was added to the aromatic polyester polyol and foamed in the same manner as above. Molding was performed to obtain an insect-proof heat insulating material.

Examples 5 and 6
In Example 1 or 2, bifenthrin 89% (FMC CORPRATION as an insect repellent)
, Agricultural Chemical Group) 0.25 part by weight or 0.5 part by weight was added to the aromatic polyester polyol, and foam molding was performed in the same manner as above to obtain an insect-proof heat insulating material.

An ant resistance test was conducted on each of the insect-insulating materials of Examples 1 to 6 as follows.
Cut out a 1 x 1 x 2 cm specimen from each insect-proof insulation and place one specimen into a breeding container with a hard gypsum hardened to a thickness of about 5 mm at the bottom of an acrylic resin cylinder with a diameter of 8 cm and a length of 6 cm. , 150 occupation ants and 15 soldier ants randomly taken out of the nest are placed in the breeding container. Prepare several breeding containers as many as the number of test specimens and place them in a container with a lid that has been preliminarily covered with wet cotton to a thickness of about 2 cm on the bottom, and place the container with the lid in a dark place at 28 ± 2 ° C. After standing for 21 days and rearing, the adhering matter adhering to the test specimen was removed, the mass of the test specimen was measured, and the mass after the test was subtracted from the mass before the test, and the mass reduction rate was calculated. At the same time, the number of ants that survived after the test was counted to calculate the death rate. In addition, the comparative example 1 which carried out foam molding similarly to the above-mentioned Example, without adding an insect repellent, foam-molded using permethrin which consists of a tan oily liquid of melting | fusing point 25-30 degreeC and a boiling point 220 degreeC as an insect repellent. For Comparative Example 2, an ant resistance test was conducted in the same manner. The results are shown in Table 1.

  In the insect repellent material according to the invention disclosed herein, since the insect repellent is uniformly dispersed in the foam, the insect repellent action against white ants is increased, and the insect repellent action is maintained over a long period of time. can do. Furthermore, since the insect repellent is solidified at room temperature when the insect repellent heat insulating material is used, there is little useless reduction due to evaporation or the like, and this also provides a good insect repellent effect over a long period of time. In addition, since the insect-proof heat insulating material does not use a volatile substance such as toluene, safety against the human body and the environment is improved.

  Also, according to the invention of the method for producing an insect repellent heat insulating material disclosed herein, the preparation of the insect repellent-containing raw material liquid is performed by heating and melting an insect repellent having a melting point of 35 ° C. to 150 ° C. It is possible to prepare an insecticide-containing raw material solution in which the insecticide is uniformly dispersed, and to easily prevent the insecticide from being unevenly distributed in the foam after foam molding. Furthermore, since the insect repellent is melted and mixed and dispersed in the foaming raw material liquid, there is no risk of foaming failure due to poor dispersion, and there is an advantage that the restriction on the amount of insect repellent added can be relaxed.

Claims (1)

In a method for producing an insect-proof heat insulating material by foam molding performed by mixing a plurality of foam raw material liquids,
  The plurality of foaming raw material liquids include a polyol side foaming raw material liquid containing a polyol component and an isocyanate side foaming raw material liquid containing an isocyanate component,
  An insect repellent having a melting point of 35 ° C. to 150 ° C. is mixed in at least one of the polyol side foaming raw material liquid and the isocyanate side foaming raw material liquid, and then the insect repellent is heated and melted to prepare an insect repellent-containing raw material liquid. Then, the method for producing an insect repellent heat insulating material is characterized by performing foam molding by mixing the insect repellent-containing raw material liquid with another foam raw material liquid.