JP4156752B2 - Insect-proof insulation manufacturing method - Google Patents
Insect-proof insulation manufacturing method Download PDFInfo
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- JP4156752B2 JP4156752B2 JP17308099A JP17308099A JP4156752B2 JP 4156752 B2 JP4156752 B2 JP 4156752B2 JP 17308099 A JP17308099 A JP 17308099A JP 17308099 A JP17308099 A JP 17308099A JP 4156752 B2 JP4156752 B2 JP 4156752B2
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- 238000009413 insulation Methods 0.000 title description 4
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- 239000007788 liquid Substances 0.000 claims description 66
- 239000002994 raw material Substances 0.000 claims description 62
- 239000006260 foam Substances 0.000 claims description 33
- 238000005187 foaming Methods 0.000 claims description 32
- 239000011810 insulating material Substances 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 18
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- 239000005877 Alpha-Cypermethrin Substances 0.000 description 2
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- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical class OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 2
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- HRBKVYFZANMGRE-UHFFFAOYSA-N chlorpyrifos-methyl Chemical group COP(=S)(OC)OC1=NC(Cl)=C(Cl)C=C1Cl HRBKVYFZANMGRE-UHFFFAOYSA-N 0.000 description 1
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- Agricultural Chemicals And Associated Chemicals (AREA)
Description
【０００１】
【発明の属する技術分野】
この発明は、防虫断熱材の製造方法に関するものである。
【０００２】
【従来の技術】
近年、家屋の断熱等に使用される断熱材として、表面側に防虫剤塗膜面を有するポリウレタンフォーム等の発泡体や、内部に防虫剤が混入されたポリウレタンフォーム等の発泡体からなる、防虫性能を有する防虫断熱材が提案されている。
【０００３】
しかし、前者の防虫剤塗膜面を有する防虫断熱材においては、単に発泡体表面に防虫剤を塗布して前記塗膜面を形成しているため、その塗膜面が存在している間は相応の防虫効果（具体的には白蟻による食害等を防ぐ効果）が得られるが、該塗膜面が虫（白蟻）による食害の進行や経時的な劣化等にともなって、当該防虫効果が低下するおそれがあり、耐久性に欠ける問題があった。
【０００４】
他方、後者の内部に防虫剤が混入された発泡体からなる防虫断熱材においては、ポリウレタン原料液等の発泡原料液に常温で粉体または油状液体の防虫剤を混入し、その防虫剤が含まれた発泡原料液を攪拌することにより防虫剤含有原料液を調製し、その原料液を用いて発泡成形を行っている。しかし、粉体状の防虫剤を混合する場合には防虫剤が発泡原料液に均一に分散し難く、得られる発泡体は防虫剤の偏在したものとなって、充分な防虫効果が得られないおそれがある。さらに、防虫効果を高めるために粉体状防虫剤の混合量を増やそうとすると、発泡原料液内での粉体状防虫剤の偏在が激しくなって発泡が良好に行われなくなり、まともな発泡体が得られなくなる。また、前記防虫剤として、常温で油状液体となるものを混合する場合には、得られる防虫断熱材の使用される常温では、防虫断熱材内の防虫剤が液状のため、蒸発等によって防虫剤の無駄な減少があり、長期に亘って良好な防虫効果を得られない問題がある。
【０００５】
なお、前記防虫剤が発泡体内部に混入される場合においては、特開平６−２９４１６５号公報に記載の発明等の如く、前記防虫剤含有原料液の調製時に防虫剤の溶剤としてトルエン等を用いることがあるが、その場合、前記トルエン等に起因してウレタンフォームの発泡形成時にフォームのセル荒れ等が起こり、本来の断熱材としての機能を阻害するおそれがある。また、フォーム中にトルエン等が残存する当該断熱材を個人住宅や商用ビル等に使用する場合には、環境汚染や人体への影響が懸念される。
【０００６】
【発明が解決しようとする課題】
この発明は、前記の点に鑑み提案されたものであって、溶剤を用いることなく均一に防虫剤が発泡体中に分散し、長期間に亘って十分な防虫効果が得られる防虫断熱材の製造方法を提供しようとするものである。
【０００７】
【課題を解決するための手段】
請求項１の発明に係る防虫断熱材の製造方法は、複数の発泡原料液を混合して行う発泡成形により防虫断熱材を製造する方法において、融点３５℃〜１５０℃の防虫剤を複数の発泡原料液の少なくとも一液に混入し加熱融解した後、前記防虫剤が融解した原料液の冷却により当該防虫剤を再結晶化させて結晶状態で分散させた防虫剤含有原料液を調製し、その後、前記防虫剤含有原料液を他の原料液と混合して発泡成形を行うことを特徴とする。
【０００８】
請求項１の発明によれば、粉体の防虫剤を加熱融解させて防虫剤含有原料を調製するので、先の従来技術欄に述べたようにトルエン等の溶剤を用いなくても、極めて容易に、防虫剤を前記原料液中に均一に分散させることができ、成形後の発泡体中に防虫剤が偏在し難いのみならず、融解により防虫剤を液状として混合分散させるので発泡不良を生じ難い。
【０００９】
さらに請求項１の発明によれば、防虫剤が融解状態で分散した原料液を冷却した後、該原料液を他の原料液と混合して発泡成形を行うので、防虫剤を発泡原料液に混入しない通常の発泡成形と同様に、発泡原料液の反応速度の制御が容易となり、発泡不良のない、良好な発泡体を得ることができる。また、得られた防虫断熱材は、その発泡体中に防虫剤が偏在することなく分散しているので、防虫効果を十分に発揮できるとともに、その防虫効果を長期間に亘って維持することができる。しかも、防虫断熱材が使用される常温では防虫剤が固体となっており、蒸発による無駄な減少が少なく、それによっても良好な防虫効果を長期に亘って維持できる。
【００１０】
請求項２の発明に係る防虫断熱材の製造方法は、請求項１において、前記複数の発泡原料液がポリオール成分を含むポリオール側発泡原料液とイソシアネート成分を含むイソシアネート側発泡原料液とからなり、前記防虫剤がポリオール側発泡原料液に混入されることを特徴とする。
【００１１】
この請求項２の発明によれば、優れた断熱性および耐候性を有することが知られている、ポリウレタンフォーム、ウレタン変成イソシアヌレートフォームあるいはウレアフォームを防虫断熱材とすることができる。さらに、防虫剤を粘性の高いポリオール成分に混入するため、ポリオール成分中に防虫剤を均一に分散させた状態を維持して、該ポリオール成分をイソシアネート成分と混合させて発泡させることができ、発泡体中に防虫材が偏在するのをより確実に防ぐことができる。
【００１２】
【発明の実施の形態】
この発明により製造される防虫断熱材は、家屋等の断熱材として使用されるもので、発泡原料液を用いて発泡成形した発泡体からなる。そして、この防虫断熱材にあっては、前記発泡体中に融点が３５℃〜１５０℃の防虫剤が分散しており、白蟻による食害を防除する等の防虫作用が付与されている。
【００１３】
前記発泡原料液は、従来からこの種断熱材に使用されているものであって、ポリオール成分を含むポリオール側発泡原料液（通称Ａ液）とイソシアネート成分を含むイソシアネート側発泡原料液（通称Ｂ液）の２液とされるのが一般的である。
【００１４】
前記ポリオール成分には、ポリエーテルポリオール，ポリエステルポリオールの双方あるいは何れか一方が使用されるが、主要となるポリオールは、短鎖多官能であって水酸基価が２５０〜４５０ＫＯＨｍｇ／ｇとするのが好ましい。なお、このポリオール成分には、触媒，製泡剤，発泡剤，難燃剤，可塑剤等が適宜添加される。
【００１５】
前記イソシアネート成分には、トルエンジフェニルジイソシアネート（ＴＤＩ）プレポリマー，メチレンジフェニルジイソシアネート（ＭＤＩ），クルードＭＤＩ，ポリメリックＭＤＩ，ウレトジオン変性ＭＤＩ，カルボジイミド変性ＭＤＩ等が使用される。
【００１６】
上記の発泡原料液から得られる発泡体としては、広義のポリウレタン硬質フォームが好ましく、具体的には、ポリウレタンフォーム，ウレタン変成イソシアヌレートフォーム，ウレアフォーム等が挙げられる。
【００１７】
前記防虫剤は、常温（５℃〜３５℃未満）時において固体で存在し、かつ少なくともポリオールの分解温度（１５０℃）以下で融解できるものとされる。すなわち、本発明の防虫剤にあっては、その融点が３５℃〜１５０℃とされる。さらに好ましくは、前記発泡原料液の発泡を良好に行うため、発泡する際の反応温度（１４０℃程度）よりも低い、５０℃〜９０℃の融点を有する防虫剤を用いるのが良い。具体的に当該防虫剤としては、２−（４−エトキシフェニル）−２−メチルプロピル−３−フェノキシベンジルエーテル〔融点：３７．０℃、慣用名：エトフェンプロックス〕、α−シペルメトリン〔融点：８２．５℃〕、ビフェントリン〔融点：６１．０℃〕、クロルピリホス〔融点：４２．０℃〕、０，０−ジメチル−０−３，５，６，−トリクロロ−２−ピリジルホスホロチオエート〔融点：４５．５℃、慣用名：クロルピリホスメチル〕等が挙げられる。
【００１８】
この防虫剤は、後述するように、前記発泡原料液を用いる発泡成形に先立って、少なくとも一液に混入される。前記防虫剤の添加量（混入量）は、防虫作用の有効性や攪拌時に用いる攪拌装置への負担や防虫剤混入後における原料液の粘性（該原料液の取り扱い性）等を考慮して定められる。具体的に当該防虫剤の添加量は、ポリオール成分１００重量部に対して０．０５〜３０．０重量部程度とされる。
【００１９】
次に、上記防虫断熱材の製造方法の一例について説明する。
まず、前記粉体の防虫剤を前記発泡原料液の少なくとも一液、この例ではポリオール成分側発泡原料液に混入するとともに、該防虫剤を融解させ、これを攪拌することによって、融解防虫剤が均一に分散した防虫剤含有原料液を調製する。なお、前記防虫剤の融解は、予め防虫剤の融点以上に昇温しておいた原料液に防虫剤を混入することにより行っても良いし、あるいは防虫剤の原料液への混入後にその原料液を加熱することにより行っても良い。
【００２０】
次いで、前記防虫剤含有原料液を所定温度まで冷却、好ましくは急冷することにより、前記防虫剤を再結晶化させ、防虫剤が微細な結晶状態で分散した原料液とする。なお、前記防虫剤含有原料液の冷却温度は、発泡成形の効率性等を考慮して、後述する防虫剤含有原料液と他の原料液とを混合させる際の混合温度と等しく設定するのが望ましい。
【００２１】
その後、前記防虫剤が微細な結晶状態で分散した原料液を他の原料液、この例ではイソシアネート成分側発泡原料液と混合し、公知の手法及び条件に基づいて発泡成形を行えば、上記防虫剤が分散した発泡体からなる防虫断熱材を得ることができる。
【００２２】
【実施例】
本発明の実施例の内で特に代表的なものを以下に示す。
実施例１，２
芳香族ポリエステルポリオール（水酸基価：４５０）１００重量部に、防虫剤として粉体のエトフェンプロックス（三井東圧社製）を実施例１として２．５重量部、実施例２として５．０重量部添加し、これをジャケットタイプの温調設備を備えたプロペラ攪拌機に投入し、７０℃に昇温して２０分間攪拌した。そして、エトフェンプロックスが融解して、ポリオール混合液（防虫剤含有原料液）が透明になるのを確認した後、さらに前記ポリオール混合液に整泡剤（ジメチルポリシロキサン変性体）１．５重量部、触媒（ジメチルシクロヘキシルアミン）１．５重量部、発泡剤として水３重量部を添加し、さらに２０分間攪拌した。その後、その混合液を室温まで冷却して前記防虫剤を再結晶化させて、ポリオール側発泡原料液を調製した。
【００２３】
他方、イソシアネートとして、１０℃に温調したポリメリックＭＤＩ（日本ポリウレタン工業社製、ＭＲ２００）からなるイソシアネート側発泡原料液を１２８重量部、イソシアネートインデクス１０５となるようにして、低圧注入機により前記ポリオール側発泡原料液と共にダブルコンベア上に吐出し、防虫断熱材を得た。
【００２４】
実施例３，４
実施例１または２において、防虫剤としてα−シペルメトリン９４．３％（日本サイアナミッド社製）０．５重量部または１．０重量部を芳香族ポリエステルポリオールに添加して、上記と同様に発泡成形を行い防虫断熱材を得た。
【００２５】
実施例５，６
実施例１または２において、防虫剤としてビフェントリン８９％（FMC CORPRATION , Agricultural
Chemical Group製）０．２５重量部または０．５重量部を芳香族ポリエステルポリオールに添加して、上記と同様に発泡成形を行い防虫断熱材を得た。
【００２６】
上記実施例１〜６の各防虫断熱材に対して次のように耐蟻性試験を行った。
各防虫断熱材から１×１×２ｃｍの試験体を切り出し、直径８ｃｍ，長さ６ｃｍのアクリル樹脂製円筒の底部に硬石こうを厚さ約５ｍｍで固めた飼育容器に前記試験体を１個入れ、該飼育容器に無作為に巣から取り出した職蟻１５０匹と兵蟻１５匹を投入する。この飼育容器を試験体の数だけ複数用意し、これらをあらかじめ底一面に約２ｃｍの厚さに湿潤綿を敷きつめた蓋付き容器内に入れ、該蓋付き容器を２８±２℃の暗所に２１日間静置して飼育した後、試験体に付着した付着物を取り去り、該試験体の質量を測定し、試験に供する前の質量から試験後の質量を差し引き、質量減少率を算出した。また、同時に、試験終了後に生存していた蟻の数を計測して死虫率を算出した。なお、防虫剤を添加せずに上述の実施例と同じように発泡成形した比較例１、防虫剤として融点２５〜３０℃、沸点２２０℃の黄褐色油状液体からなるペルメトリンを用いて発泡成形した比較例２についても、同様にして耐蟻性試験を行った。結果を表１に示す。
【００２７】
【表１】
【発明の効果】
ここで開示された発明に係る防虫断熱材は、その発泡体中に防虫剤が均一に分散しているので、白蟻による食害等に対する防虫作用が高まるとともに、その防虫作用を長期間に亘って維持することができる。さらに、防虫断熱材使用時の常温において、防虫剤は固体化しているため、蒸発等による無駄な減少が少なく、これによっても、良好な防虫効果がより長期に亘って得られる。加えて、当該防虫断熱材は、トルエン等の揮発性物質を用いないので、人体や環境等に対する安全性が向上する。
【００２９】
また、ここで開示された防虫断熱材の製造方法の発明によれば、防虫剤含有原料液の調製は融点が３５℃〜１５０℃の防虫剤を加熱融解させて行うので、極めて簡単に防虫剤が均一に分散した防虫剤含有原料液を調製することができ、発泡成形後における発泡体中で防虫剤が偏在するのを容易に防ぐことができる。さらに、防虫剤を融解させて発泡原料液に混合分散するため、その分散不良による発泡不良のおそれがなく、防虫剤添加量の制限を緩和できる利点もある。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an insect-proof heat insulating material .
[0002]
[Prior art]
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.
[0003]
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.
[0004]
On the other hand, in the case of the latter, in the insect-insulating material made of foam in which an insect repellent is mixed, a foam 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.
[0005]
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.
[0006]
[Problems to be solved by the invention]
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.
[0007]
[Means for Solving the Problems]
The method for manufacturing an insect-insulating material according to claim 1 is a method of manufacturing an insect-insulating material by foam molding performed by mixing a plurality of foaming raw material liquids, and a plurality of insecticides having a melting point of 35 ° C. to 150 ° C. After mixing in at least one of the raw material liquids and heating and melting, the insect repellent-containing raw material liquid prepared by recrystallizing the insect repellent by cooling the raw material liquid in which the insect repellent is melted and dispersed in a crystalline state is prepared. The insecticide-containing raw material liquid is mixed with other raw material liquids to perform foam molding.
[0008]
According to the first aspect of the present invention, since the insect repellent-containing raw material is prepared by heating and melting the powder repellent, it is extremely easy even without using a solvent such as toluene as described in the prior art section. In addition, the insect repellent can be uniformly dispersed in the raw material liquid, and not only is the insect repellent difficult to be unevenly distributed in the molded foam, but also the foam repellent is mixed and dispersed by melting, resulting in poor foaming. hard.
[0009]
Furthermore, according to the invention of claim 1, since the raw material liquid in which the insect repellent is dispersed in a molten state is cooled, the raw material liquid is mixed with other raw material liquids to perform foam molding. As in normal foam molding without mixing, the reaction rate of the foaming raw material liquid can be easily controlled, and a good foam free from foaming failure can be obtained. Moreover, since the insect repellent obtained is dispersed in the foam without the insect repellent being unevenly distributed, the insect repellent effect can be sufficiently exerted and the insect repellent effect can be maintained over a long period of time. it can. 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.
[0010]
The manufacturing method of the insect-proof heat insulating material according to the invention of claim 2 is the method according to claim 1, wherein 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, The insect repellent is mixed in a polyol-side foaming raw material liquid.
[0011]
According to the invention of claim 2 , polyurethane foam, urethane-modified isocyanurate foam, or urea foam, which is known to have excellent heat insulation and weather resistance, can be used as an insect-proof heat insulating material. Furthermore, since the insect repellent is mixed into the highly viscous polyol component, the state in which the insect repellent is uniformly dispersed in the polyol component can be maintained, and the polyol component can be mixed with the isocyanate component to be foamed. It is possible to more reliably prevent the insect repellent material from being unevenly distributed in the body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The insect-proof heat insulating material manufactured by this invention is used as a heat insulating material for a house or the like, and is formed of a foam that is foam-molded 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.
[0013]
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.
[0014]
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.
[0015]
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.
[0016]
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.
[0017]
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.
[0018]
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.
[0019]
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 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 raw material liquid. You may carry out by heating a liquid.
[0020]
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 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 other raw material liquids in consideration of the efficiency of foam molding and the like. desirable.
[0021]
Thereafter, the above insect repellent can be obtained by mixing the raw material liquid in which the insect repellent is dispersed in a fine crystalline state with another raw material liquid, in this example, the isocyanate component side foam raw material liquid, and performing foam molding based on known methods and conditions. An insect-insulating heat insulating material comprising a foam in which the agent is dispersed can be obtained.
[0022]
【Example】
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.
[0023]
On the other hand, an isocyanate side foaming raw material liquid composed 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, and the isocyanate index 105 is used. It discharged on the double conveyor with the foaming raw material liquid, and obtained the insect-proof heat insulating material.
[0024]
Examples 3 and 4
In Example 1 or 2, 0.5 part 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 foaming was performed in the same manner as described above. Molding was performed to obtain an insect-proof heat insulating material.
[0025]
Examples 5 and 6
In Example 1 or 2, bifenthrin 89% (FMC CORPRATION, 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 described above to obtain an insect-proof heat insulating material.
[0026]
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.
[0027]
[Table 1]
【The invention's effect】
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.
[0029]
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 (2)
融点３５℃〜１５０℃の防虫剤を複数の発泡原料液の少なくとも一液に混入し加熱融解した後、前記防虫剤が融解した原料液の冷却により当該防虫剤を再結晶化させて結晶状態で分散させた防虫剤含有原料液を調製し、その後、前記防虫剤含有原料液を他の原料液と混合して発泡成形を行うことを特徴とする防虫断熱材の製造方法。 An insect repellent having a melting point of 35 ° C. to 150 ° C. is mixed in at least one of a plurality of foaming raw material liquids and heated and melted. A method for producing an insect repellent heat insulating material, comprising preparing a dispersed insect repellent-containing raw material liquid, and then performing foam molding by mixing the insect repellent-containing raw material liquid with another raw material liquid.
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| JP2008255092A (en) * | 2007-01-26 | 2008-10-23 | Japan Enviro Chemicals Ltd | Neonicotinoid preparation, curable termite control composition, termite-proofing coating composition, termite-proofing resin molded article, sprinkler, sprinkling method, and treating method |
| AU2009228116B2 (en) * | 2008-03-28 | 2014-02-06 | Icp Adhesives And Sealants, Inc. | Insect-resistant polyurethane foam |
| JP2018003267A (en) * | 2016-06-27 | 2018-01-11 | 積水ハウス株式会社 | Ant protection structure for building foundation and its construction method |
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