JP2010070695A - Flame-retardant epoxy resin and method for producing the same - Google Patents

Flame-retardant epoxy resin and method for producing the same Download PDF

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JP2010070695A
JP2010070695A JP2008241913A JP2008241913A JP2010070695A JP 2010070695 A JP2010070695 A JP 2010070695A JP 2008241913 A JP2008241913 A JP 2008241913A JP 2008241913 A JP2008241913 A JP 2008241913A JP 2010070695 A JP2010070695 A JP 2010070695A
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phytic acid
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JP5311380B2 (en
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Kazuhiro Taguchi
和宏 田口
Shigeo Hirose
重雄 廣瀬
Yuichi Nakagawa
祐一 中川
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National Institute of Advanced Industrial Science and Technology AIST
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant cured epoxy resin which can be produced at a low unit production cost and a method for producing the flame-retardant cured epoxy resin. <P>SOLUTION: The flame-retardant cured epoxy resin containing phosphorus is produced by cationic-polymerizing an epoxy compound containing an alcohol such as glycerol with plant-derived phytic acid containing phosphorus as an acid catalyst and chemically bonding the phytic acid. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、難燃性エポキシ樹脂及びそれを製造する技術に関し、特に、植物由来の材料を用いて、低い製造単価で難燃性エポキシ樹脂を製造する技術に関する。   The present invention relates to a flame retardant epoxy resin and a technique for producing the flame retardant epoxy resin, and more particularly, to a technique for producing a flame retardant epoxy resin at a low production unit cost using plant-derived materials.

エポキシ樹脂は、エンジニアリングプラスチックス、電子機器、接着剤、塗料など広範囲な応用がなされている代表的な熱硬化性樹脂である。
硬化前のエポキシ基を含む化合物は、低分子又は中分子量物質で、固体状態のものもあるが、多くは液状である。エポキシ基を含む化合物は、種々の硬化剤により、エポキシ基(オキシラン)の開環による高分子化と架橋反応が起こり硬化した樹脂を与える。なお、一般に「エポキシ樹脂」といった場合、硬化前のエポキシ基を有する化合物を指す場合と、硬化後の樹脂を指す場合があるが、ここでは、硬化前の液状または固体状のエポキシ基を有する化合物を、「エポキシ化合物」と称し、硬化後のものを、「(エポキシ)硬化樹脂」と称することとする。
Epoxy resins are typical thermosetting resins that have a wide range of applications such as engineering plastics, electronic equipment, adhesives, and paints.
The compound containing an epoxy group before curing is a low molecular or medium molecular weight substance, and there are some in a solid state, but many are liquid. The compound containing an epoxy group gives a cured resin by polymerizing and crosslinking reaction by ring opening of an epoxy group (oxirane) by various curing agents. In general, the term “epoxy resin” refers to a compound having an epoxy group before curing, and sometimes refers to a resin after curing, but here, a compound having a liquid or solid epoxy group before curing. Is called “epoxy compound”, and the cured product is called “(epoxy) cured resin”.

エポキシ化合物の硬化は、重付加型反応または触媒型反応により行われる。重付加型反応は、ポリアミン(ジエチレントリアミンやトリエチレンテトラミンなど)、酸無水物(無水フタル酸や無水ピロメリット酸など)、ポリフェノール(フェノールノボラックなど)、ポリメルカプタンなどを硬化剤として行われる。触媒型反応の一つ、アニオン重合型反応は、第三アミン(2,4,6−トリス(ジメチルアミノメチル)フェノールなど)やイミダゾール化合物(2−エチル−4−メチルイミダゾールなど)を硬化剤として使用されている。もう一つの触媒型反応、カチオン重合型反応は、BFモノメチルアミン錯体などが硬化剤として使用されている。
得られたエポキシ硬化樹脂は、大気下で燃焼性を有するため難燃化が重要な課題であるが、これらの従来の硬化剤には、硬化樹脂に難燃性を付与できる元素(塩素や臭素などのハロゲン、またはリンなど)が含まれず、また一般のエポキシ化合物も同様に難燃性を付与するような元素を含まないため、得られるエポキシ硬化樹脂は難燃性に乏しい材料である。
Curing of the epoxy compound is performed by a polyaddition type reaction or a catalytic type reaction. The polyaddition reaction is carried out using polyamine (such as diethylenetriamine or triethylenetetramine), acid anhydride (such as phthalic anhydride or pyromellitic anhydride), polyphenol (such as phenol novolac), or polymercaptan as a curing agent. One of the catalytic reactions, anionic polymerization reaction, uses tertiary amines (2,4,6-tris (dimethylaminomethyl) phenol, etc.) and imidazole compounds (2-ethyl-4-methylimidazole, etc.) as curing agents. in use. In another catalyst type reaction, cationic polymerization type reaction, BF 3 monomethylamine complex or the like is used as a curing agent.
The resulting epoxy cured resin is flammable in the atmosphere, so flame retardancy is an important issue. However, these conventional curing agents include elements that can impart flame retardancy to the cured resin (chlorine and bromine). And the like, and a general epoxy compound does not contain an element that imparts flame retardancy as well, so that the resulting epoxy cured resin is a material with poor flame retardancy.

そこで、従来、こうしたエポキシ硬化樹脂の難燃化には、臭素に代表されるようなハロゲンを化学構造に組み入れたエポキシ化合物などの難燃成分を汎用エポキシ化合物に追加し、硬化させることにより行われてきた。例えば、特許文献1で、ノボラック型エポキシ樹脂及びN,N,N′,N′−テトラグリシジルジアミノジフェニルメタンの混合物系に、臭素化ビスフェノールA型エポキシ樹脂を混合することにより難燃性を付与することが記載されている。
しかし、燃焼の際にハロゲン化水素等の有害な物質であるハロゲン化物を生成するという問題がある。この問題を解決するため、特許文献2,3では、エポキシ樹脂にリン化合物を反応せしめたものを用いることが提案されている。
特開昭59−33322号公報 特開平11−166035号公報 特開平11−279258号公報
Therefore, conventionally, such an epoxy cured resin is made flame retardant by adding a flame retardant component such as an epoxy compound in which halogen such as bromine is incorporated into a chemical structure to a general-purpose epoxy compound and curing it. I came. For example, in Patent Document 1, flame retardancy is imparted by mixing brominated bisphenol A type epoxy resin into a mixture system of novolac type epoxy resin and N, N, N ′, N′-tetraglycidyldiaminodiphenylmethane. Is described.
However, there is a problem that a halide which is a harmful substance such as hydrogen halide is generated during combustion. In order to solve this problem, Patent Documents 2 and 3 propose using epoxy resin obtained by reacting a phosphorus compound.
JP 59-33322 A JP-A-11-166035 JP-A-11-279258

しかしながら、臭素やリンを含有するエポキシ化合物の製造は手間がかかり、化合物の価格は汎用エポキシ化合物より大幅に上回るため、難燃性エポキシ硬化樹脂の製造において、これらのエポキシ化合物の利用範囲は非常に限定されており、製造単価を上げないエポキシ硬化樹脂の難燃化法が求められてきた。
本発明は、以上のような事情に鑑みてなされたものであって、低い製造単価で、難燃性のエポキシ硬化樹脂の製造を可能とすることを目的とするものである。
However, since the production of epoxy compounds containing bromine and phosphorus is time consuming and the price of the compound is significantly higher than that of general-purpose epoxy compounds, the range of use of these epoxy compounds in the production of flame retardant epoxy cured resins is extremely high. There has been a demand for a flame-retarding method for epoxy-cured resins that is limited and does not increase the production cost.
This invention is made | formed in view of the above situations, Comprising: It aims at enabling manufacture of a flame-retardant epoxy cured resin with a low manufacturing unit price.

リン元素を含有するフィチン酸は植物由来の物質であり、米などの穀類には、このフィチン酸が、水に不溶なカルシウム塩、マグネシウム塩の形で大量に含まれている。例えば、玄米には、1.03〜1.17重量%、米ぬかには、9.5〜14.5重量%含まれており、酸処理により容易に水に可溶なフィチン酸として取り出すことができる。
このフィチン酸は、多価アルコールであるイノシトールのヘキサリン酸エステル構造を持つ強酸性の物質である。リン酸に比べて遙かに強い酸性を示すが、天然物であるが故に、簡単な中和により廃棄ができるので、フィチン酸塩は酸化防止剤などとして、食品や化粧品の添加物として用いられている。
Phytic acid containing elemental phosphorus is a plant-derived substance, and grains such as rice contain a large amount of this phytic acid in the form of calcium and magnesium salts that are insoluble in water. For example, brown rice contains 1.03-1.17% by weight, and rice bran contains 9.5-14.5% by weight, and can be easily taken out as water-soluble phytic acid by acid treatment. it can.
This phytic acid is a strongly acidic substance having a hexaphosphate structure of inositol, which is a polyhydric alcohol. Although it is much more acidic than phosphoric acid, it is a natural product and can be discarded by simple neutralization. Therefore, phytate is used as an antioxidant and as an additive in foods and cosmetics. ing.

本発明者らは、既にこのフィチン酸を用いて、安全性が高く、安価で活性の高い、脱水反応用の酸触媒及びそれを用いたエステル又はエーテルの製造方法を提案している(特願2007−166268号)。
本発明者らは、上記課題を解決するために更に鋭意検討を重ね、グリセリンなどのアルコール類を含むエポキシ化合物を、植物由来の物質であるフィチン酸を酸触媒としてカチオン重合させるとともに、フィチン酸を化学結合させることによりリン含有難燃性エポキシ硬化樹脂を得ることが出来ることを見いだした。また、フィチン酸を、油脂のエステル交換反応の酸触媒として用いることにより、フィチン酸を含むグリセリンを製造した場合には、この混合物からも難燃性エポキシ硬化樹脂を得ることができることも判明した。
The present inventors have already proposed a highly safe, inexpensive and highly active acid catalyst for dehydration reaction using this phytic acid and a method for producing an ester or ether using the same (Japanese Patent Application). 2007-166268).
In order to solve the above-mentioned problems, the present inventors have made further intensive studies, and cationically polymerize an epoxy compound containing alcohols such as glycerin using phytic acid, which is a plant-derived substance, as an acid catalyst, and phytic acid. It has been found that a phosphorus-containing flame-retardant epoxy cured resin can be obtained by chemical bonding. It has also been found that when glycerin containing phytic acid is produced by using phytic acid as an acid catalyst for the transesterification of fats and oils, a flame retardant epoxy cured resin can be obtained from this mixture.

本発明は、該知見に基づいて完成に至ったものであり、以下のとおりのものである。
[1]エポキシ化合物及びフィチン酸を含有することを特徴とする硬化性組成物。
[2]前記フィチン酸の可溶化剤として、アルコールを含有することを特徴とする前記[1]の硬化性組成物。
[3]前記アルコールが、グリセリンであることを特徴とする前記[2]の硬化性組成物。
[4]フィチン酸が化学結合していることを特徴とする難燃性エポキシ硬化樹脂。
[5]エポキシ化合物にフィチン酸を添加して混練した後、得られた混合物を室温又は加温下で放置して硬化させることを特徴とするエポキシ硬化樹脂の製造方法。
[6]前記フィチン酸の可溶化剤としてアルコールを用いることを特徴とする前記[5]のエポキシ硬化樹脂の製造方法。
[7]油脂と低級アルコールの混合物にフィチン酸を添加してエステル交換反応により脂肪酸エステルとグリセリンを生成せしめた後、得られた脂肪酸エステルを蒸留除去し、蒸気圧の低いフィチン酸とグリセリンの混合物を得、これにエポキシ化合物を混合することを特徴とする前記[5]又は[6]のエポキシ硬化樹脂の製造方法。
The present invention has been completed based on this finding, and is as follows.
[1] A curable composition comprising an epoxy compound and phytic acid.
[2] The curable composition according to the above [1], which contains an alcohol as a solubilizer for the phytic acid.
[3] The curable composition according to the above [2], wherein the alcohol is glycerin.
[4] A flame retardant epoxy cured resin, wherein phytic acid is chemically bonded.
[5] A method for producing an epoxy cured resin, comprising adding phytic acid to an epoxy compound and kneading, and then allowing the resulting mixture to cure at room temperature or under heating.
[6] The method for producing an epoxy cured resin according to [5], wherein alcohol is used as the solubilizing agent for phytic acid.
[7] After adding phytic acid to a mixture of fat and lower alcohol and producing a fatty acid ester and glycerin by transesterification, the resulting fatty acid ester is distilled off to obtain a mixture of phytic acid and glycerin having a low vapor pressure And the epoxy compound is mixed therewith, the method for producing an epoxy cured resin according to the above [5] or [6].

本発明は、植物由来のフィチン酸を酸触媒としてエポキシ化合物をカチオン重合させることにより、フィチン酸が化学結合したリン含有難燃性エポキシ硬化樹脂を得ることができ、難燃成分として高価な臭素化されたエポキシ化合物に替えて、安価なフィチン酸を使用するため、難燃性エポキシ硬化樹脂の製造単価を低く抑えることが可能である。また、油脂のエステル交換のためにフィチン酸を酸触媒として使い、フィチン酸を含むグリセリンを製造すれば、この混合物からも難燃性エポキシ硬化樹脂を得ることができる。   The present invention can obtain a phosphorus-containing flame-retardant epoxy cured resin in which phytic acid is chemically bonded by cationically polymerizing an epoxy compound using plant-derived phytic acid as an acid catalyst, and is expensive brominated as a flame retardant component Since inexpensive phytic acid is used in place of the epoxy compound, it is possible to keep the unit price of the flame-retardant epoxy cured resin low. Moreover, if phytic acid is used as an acid catalyst for transesterification of fats and oils and glycerin containing phytic acid is produced, a flame-retardant epoxy cured resin can be obtained from this mixture.

本発明で用いるフィチン酸は、下記の式で示される化合物であって、本発明は、このフィチン酸を用いることによって、エポキシ化合物の硬化剤の役割と共に、難燃成分としての役割を同時に発現させる点に特徴を有する。   The phytic acid used in the present invention is a compound represented by the following formula. In the present invention, by using this phytic acid, a role as a flame retardant component as well as a role as a curing agent for an epoxy compound is developed simultaneously. Characterized by points.

Figure 2010070695
Figure 2010070695

フィチン酸は強酸性の化合物であり、エポキシ化合物をカチオン重合により硬化させるとともに、フィチン酸はエポキシ化合物に付加反応し、硬化樹脂中に固定化される。そして、フィチン酸はリン含量が、28重量%と極めて高い化合物であるため、難燃性の付与に有効なリン元素を硬化樹脂中に4〜5重量%程度含ませることが可能となり、高い難燃機能を付与することが可能となる。   Phytic acid is a strongly acidic compound, and the epoxy compound is cured by cationic polymerization. At the same time, phytic acid undergoes an addition reaction with the epoxy compound and is fixed in the cured resin. And since phytic acid is a compound having a very high phosphorus content of 28% by weight, it is possible to contain about 4-5% by weight of a phosphorus element effective for imparting flame retardancy in the cured resin. It is possible to impart a fuel function.

本発明において用いられるエポキシ化合物としては、一般的なエポキシ硬化樹脂の製造に使われる様々な化学構造を有するエポキシ化合物が用いられる。
具体的には、二官能性エポキシ化合物として、ビスフェノールAジグリシジルエーテル、ビス[4−(グリシジルオキシ)フェニル]メタン(ビスフェノールFジグリシジルエーテル)、ヘキサヒドロビスフェノールAジグリシジルエーテル、レゾルシノールジグリシジルエーテル、フタル酸ジグリシジルエステル、1,4−ブタンジオールジグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、エチレンルグリコールジグリシジルエーテル、などが挙げられる。三官能性エポキシ化合物として、トリメチロールプロパントリグリシジルエーテル、N,N−ジグリシジル−4−グリシジルオキシアニリン、トリス(2,3−エポキシプロピル)イソシアヌレートなどが挙げられる。四官能性エポキシ化合物として、4,4´−メチレンビス(N,N−ジグリシジルアニリン)、テトラグリシジルメタエチレンジアミンなどが挙げられる。また、3.4−エポキシシクロヘキシルメチルカルボキシレート等の脂環式エポキシ化合物やエポキシ化大豆油、なども用いることができる。
As the epoxy compound used in the present invention, epoxy compounds having various chemical structures used in the production of general epoxy cured resins are used.
Specifically, as the bifunctional epoxy compound, bisphenol A diglycidyl ether, bis [4- (glycidyloxy) phenyl] methane (bisphenol F diglycidyl ether), hexahydrobisphenol A diglycidyl ether, resorcinol diglycidyl ether, Examples thereof include phthalic acid diglycidyl ester, 1,4-butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, and ethylene glycol diglycidyl ether. Examples of the trifunctional epoxy compound include trimethylolpropane triglycidyl ether, N, N-diglycidyl-4-glycidyloxyaniline, and tris (2,3-epoxypropyl) isocyanurate. Examples of the tetrafunctional epoxy compound include 4,4′-methylenebis (N, N-diglycidylaniline) and tetraglycidylmetaethylenediamine. In addition, alicyclic epoxy compounds such as 3.4-epoxycyclohexylmethylcarboxylate, epoxidized soybean oil, and the like can also be used.

上記フィチン酸をエポキシ化合物に添加し、混練した後、混合物を室温、または加温下で放置することによりエポキシ硬化樹脂を得ることができる。フィチン酸とエポキシ化合物との相溶性が十分でないときは、フィチン酸にアルコール類などを含ませることにより両者の相溶性を高め、均質な混合物を得ることができる。   After adding the phytic acid to the epoxy compound and kneading, the epoxy cured resin can be obtained by allowing the mixture to stand at room temperature or under heating. When the compatibility of phytic acid and the epoxy compound is not sufficient, the compatibility of both can be improved by including alcohols in the phytic acid, and a homogeneous mixture can be obtained.

本発明において、相溶性を高めるアルコール類としては、メタノールやエタノールといった単官能性アルコールのほか、エチレングリコール、1,2−プロピレングリコール、1,3−プロピレングリコール、1,4−ブタンジオール、ジエチレングリコール、トリエチレングリコール、テトラエチレングリコール、グリセリン、トリメチロールプロパン、ペンタエリスリトールなど多価アルコールが挙げられる。多価アルコールは単官能性アルコールに比べ、硬化後のエポキシ樹脂の硬度が高く望ましい。   In the present invention, alcohols that enhance compatibility include monofunctional alcohols such as methanol and ethanol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, diethylene glycol, Examples thereof include polyhydric alcohols such as triethylene glycol, tetraethylene glycol, glycerin, trimethylolpropane, and pentaerythritol. Polyhydric alcohol is desirable because the cured epoxy resin has a higher hardness than monofunctional alcohol.

また、本発明に用いるフィチン酸は、酸触媒としてエステル交換反応に利用できる(上記の特願2007−166268号参照)ので、油脂とメタノール、エタノール等の低級アルコールの混合物にフィチン酸を添加すると、下記のようにして、脂肪酸エステルとグリセリンが生成する。エステル交換反応により生成した脂肪酸エステルを、蒸留などにより反応液から除くと、蒸気圧が低いフィチン酸とグリセリンからなる混合液を得ることができるので、本発明においては、この混合液を酸触媒として、エポキシ化合物を硬化させることにより難燃性エポキシ硬化樹脂を得ることができる。   In addition, since phytic acid used in the present invention can be used for an ester exchange reaction as an acid catalyst (see the above-mentioned Japanese Patent Application No. 2007-166268), when phytic acid is added to a mixture of fats and oils and lower alcohols such as methanol and ethanol, Fatty acid esters and glycerin are produced as follows. When the fatty acid ester produced by the transesterification reaction is removed from the reaction solution by distillation or the like, a mixed solution composed of phytic acid and glycerin having a low vapor pressure can be obtained. In the present invention, this mixed solution is used as an acid catalyst. A flame retardant epoxy cured resin can be obtained by curing the epoxy compound.

Figure 2010070695
Figure 2010070695

以下、本発明を実施例によってさらに具体的に説明するが、本発明はこれら実施例により何ら限定されるものではない。
(実施例1)
フィチン酸50%水溶液1重量部をグリセリン1重量部に混合し、混合物を60℃で2時間、減圧下で攪拌し、フィチン酸中に含まれていた水分を除いた。
また、ビスフェノールAジグリシジルエーテル9重量部とトリメチロールプロパントリグリシジルエーテル1重量部とを混合し、攪拌により均質に混和し、エポキシ混合物を調製した。
先に調製したフィチン酸−グリセリン混合物の1重量部と、エポキシ混合物の1.5重量部とを攪拌により均質に混練した。
この混練物を金型に流し、12時間静置し、硬化物を得た。続いて硬化物を150℃の恒温室内で1時間加熱処理を行い、半透明樹脂を得た。硬化物は大気下で着火性を持たなかった。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
Example 1
1 part by weight of a 50% aqueous solution of phytic acid was mixed with 1 part by weight of glycerin, and the mixture was stirred at 60 ° C. for 2 hours under reduced pressure to remove water contained in phytic acid.
Further, 9 parts by weight of bisphenol A diglycidyl ether and 1 part by weight of trimethylolpropane triglycidyl ether were mixed and mixed homogeneously by stirring to prepare an epoxy mixture.
1 part by weight of the previously prepared phytic acid-glycerin mixture and 1.5 parts by weight of the epoxy mixture were homogeneously kneaded by stirring.
The kneaded product was poured into a mold and allowed to stand for 12 hours to obtain a cured product. Subsequently, the cured product was heat-treated in a thermostatic chamber at 150 ° C. for 1 hour to obtain a translucent resin. The cured product was not ignitable in the atmosphere.

(実施例2)
フィチン酸50%水溶液1重量部をグリセリン1重量部に混合し、混合物を60℃で2時間、減圧下で攪拌し、フィチン酸中に含まれていた水分を除いた。調製したフィチン酸−グリセリン混合物の1重量部と、ビスフェノールFジグリシジルエーテルの3.87重量部とを攪拌により均質に混練した。
この混練物を金型に流し、80℃で1時間、続いて150℃で1時間加熱処理を行い、白色樹脂を得た。硬化物は大気下で着火性を持たなかった。
(Example 2)
1 part by weight of a 50% aqueous solution of phytic acid was mixed with 1 part by weight of glycerin, and the mixture was stirred at 60 ° C. for 2 hours under reduced pressure to remove water contained in phytic acid. 1 part by weight of the prepared phytic acid-glycerin mixture and 3.87 parts by weight of bisphenol F diglycidyl ether were homogeneously kneaded by stirring.
The kneaded product was poured into a mold and heat-treated at 80 ° C. for 1 hour and then at 150 ° C. for 1 hour to obtain a white resin. The cured product was not ignitable in the atmosphere.

(実施例3)
フィチン酸50%水溶液1重量部をエチレングリコール1重量部に混合し、混合物を60℃で2時間、減圧下で攪拌し、フィチン酸中に含まれていた水分を除いた。調製したフィチン酸−エチレングリコール混合物の1重量部と、ビスフェノールAジグリシジルエーテルの4.68重量部とを攪拌により均質に混練した。
この混練物を金型に流し、80℃で1時間、続いて150℃で1時間加熱処理を行い、半透明樹脂を得た。硬化物は大気下で着火性を持たなかった。また、得られた樹脂の、示差走査熱量計によるガラス転移温度は、57.3℃であった。
(Example 3)
1 part by weight of a 50% aqueous solution of phytic acid was mixed with 1 part by weight of ethylene glycol, and the mixture was stirred at 60 ° C. for 2 hours under reduced pressure to remove water contained in phytic acid. 1 part by weight of the prepared phytic acid-ethylene glycol mixture and 4.68 parts by weight of bisphenol A diglycidyl ether were homogeneously kneaded by stirring.
The kneaded product was poured into a mold and heat-treated at 80 ° C. for 1 hour and then at 150 ° C. for 1 hour to obtain a translucent resin. The cured product was not ignitable in the atmosphere. Moreover, the glass transition temperature of the obtained resin by a differential scanning calorimeter was 57.3 ° C.

(実施例4)JIS規格の方法に準拠して
フィチン酸50%水溶液3重量部をエチレングリコール1重量部に混合し、混合物を60℃で2時間、減圧下で攪拌し、フィチン酸中に含まれていた水分を除いた。また、ビスフェノールAジグリシジルエーテル8重量部とトリメチロールプロパントリグリシジルエーテル2重量部とを混合し、エポキシ化合物混合液を調製した。
先に調製したフィチン酸−エチレングリコール混合物の1重量部とエポキシ化合物の混合液の2重量部とを攪拌により均質に混練した。
この混練物を金型に流し、80℃で1時間、続いて120℃で1時間加熱処理を行い、半透明樹脂を得た。硬化物は大気下で着火性を持たなかった。
(Example 4) 3 parts by weight of a 50% aqueous solution of phytic acid was mixed with 1 part by weight of ethylene glycol in accordance with the method of JIS standard, and the mixture was stirred at 60 ° C. for 2 hours under reduced pressure and contained in phytic acid. The moisture that had been removed was removed. Further, 8 parts by weight of bisphenol A diglycidyl ether and 2 parts by weight of trimethylolpropane triglycidyl ether were mixed to prepare an epoxy compound mixed solution.
1 part by weight of the previously prepared phytic acid-ethylene glycol mixture and 2 parts by weight of the epoxy compound mixture were homogeneously kneaded by stirring.
The kneaded product was poured into a mold and heat-treated at 80 ° C. for 1 hour and then at 120 ° C. for 1 hour to obtain a translucent resin. The cured product was not ignitable in the atmosphere.

(実施例5)
フィチン酸50%水溶液1重量部と1,3−プロピレングリコール1重量部を混合し、混合物を60℃で2時間、減圧下で攪拌し、フィチン酸中に含まれていた水分を除いた。この混合物7.4重量部に、ビスフェノールAジグリシジルエーテル28重量部を混合し、攪拌により均質に混練した。
この混練物を金型に流し、80℃で1時間、次いで150℃で1時間加熱処理を行い、半透明の硬化物を得た。また、得られた樹脂の示差走査熱量計によるガラス転移温度は、49.7℃であった。さらに、この樹脂について、JIS規格(JISK7201)の方法に準拠して限界酸素指数を測定したところ、24.1%(標準偏差0.45%)であった。
(Example 5)
1 part by weight of a 50% aqueous phytic acid solution and 1 part by weight of 1,3-propylene glycol were mixed, and the mixture was stirred at 60 ° C. for 2 hours under reduced pressure to remove moisture contained in phytic acid. To 7.4 parts by weight of this mixture, 28 parts by weight of bisphenol A diglycidyl ether was mixed and homogeneously kneaded by stirring.
The kneaded product was poured into a mold and heat-treated at 80 ° C. for 1 hour and then at 150 ° C. for 1 hour to obtain a translucent cured product. Moreover, the glass transition temperature of the obtained resin by a differential scanning calorimeter was 49.7 ° C. Furthermore, when the critical oxygen index of this resin was measured in accordance with the method of JIS standard (JISK7201), it was 24.1% (standard deviation 0.45%).

(実施例6)
フィチン酸50%水溶液5.28g(4mmol)とトリメチロールプロパン3.22g(24mmol)とを混合し、60℃に加温しながら2時間、真空下で水分を除去した。ビスフェノールAジグリシジルエーテル20.4gを加え混練した。
混練物を金型に流し、45℃に1時間、さらに120℃で1時間加熱することにより、半透明の硬化物を得た。得られた樹脂の示差走査熱量計によるガラス転移温度は、65.0℃であった。
(Example 6)
A phytic acid 50% aqueous solution (5.28 g, 4 mmol) and trimethylolpropane (3.22 g, 24 mmol) were mixed, and water was removed under vacuum for 2 hours while heating to 60 ° C. 20.4 g of bisphenol A diglycidyl ether was added and kneaded.
The kneaded product was poured into a mold and heated at 45 ° C. for 1 hour and further at 120 ° C. for 1 hour to obtain a translucent cured product. The glass transition temperature of the obtained resin as measured by a differential scanning calorimeter was 65.0 ° C.

エポキシ樹脂は、エンジニアリングプラスチックス、電子機器、接着剤、塗料など広範囲な応用がなされている代表的な熱硬化性樹脂で難燃化が重要である。本発明は、生体由来の物質であるフィチン酸を原料に用いることにより、低い製造単価で難燃性エポキシ樹脂を製造することを可能にする。また、油脂のエステル交換のためにフィチン酸を酸触媒として用いた場合には、内燃機関の燃料となる脂肪酸メチルの製造が可能となると共に、得られたフィチン酸を含むグリセリンからも難燃性エポキシ硬化樹脂を得ることが可能である。   Epoxy resin is a typical thermosetting resin that has a wide range of applications such as engineering plastics, electronic equipment, adhesives, paints, etc., and its flame resistance is important. The present invention makes it possible to produce a flame-retardant epoxy resin at a low production cost by using phytic acid, which is a biological material, as a raw material. In addition, when phytic acid is used as an acid catalyst for transesterification of fats and oils, it becomes possible to produce fatty acid methyl as a fuel for an internal combustion engine, and flame retardant from glycerin containing phytic acid obtained. It is possible to obtain an epoxy cured resin.

Claims (7)

エポキシ化合物及びフィチン酸を含有することを特徴とする硬化性組成物。   A curable composition comprising an epoxy compound and phytic acid. 前記フィチン酸の可溶化剤として、アルコールを含有することを特徴とする請求項1に記載の硬化性組成物。   The curable composition according to claim 1, further comprising an alcohol as the phytic acid solubilizer. 前記アルコールが、グリセリンであることを特徴とする請求項2に記載の硬化性組成物。   The curable composition according to claim 2, wherein the alcohol is glycerin. エポキシ化合物にフィチン酸を反応せしめてなることを特徴とする難燃性エポキシ硬化樹脂。   A flame-retardant epoxy-cured resin characterized by reacting phytic acid with an epoxy compound. エポキシ化合物にフィチン酸を添加して混練した後、得られた混合物を室温又は加温下で放置して硬化させることを特徴とするエポキシ硬化樹脂の製造方法。   A method for producing an epoxy-cured resin, comprising adding phytic acid to an epoxy compound and kneading, and then allowing the resulting mixture to cure at room temperature or under heating. 前記フィチン酸の可溶化剤としてアルコールを用いることを特徴とする請求項5に記載のエポキシ硬化樹脂の製造方法。   6. The method for producing an epoxy cured resin according to claim 5, wherein alcohol is used as the solubilizing agent for phytic acid. 油脂と低級アルコールの混合物にフィチン酸を添加してエステル交換反応により脂肪酸エステルとグリセリンを生成せしめた後、得られた脂肪酸エステルを蒸留除去し、蒸気圧の低いフィチン酸とグリセリンの混合物を得、これにエポキシ化合物を混合することを特徴とする請求項5又は6に記載のエポキシ硬化樹脂の製造方法。   After adding phytic acid to a mixture of fat and lower alcohol and producing a fatty acid ester and glycerin by transesterification, the resulting fatty acid ester was distilled off to obtain a mixture of phytic acid and glycerin having a low vapor pressure, An epoxy compound is mixed with this, The manufacturing method of the epoxy cured resin of Claim 5 or 6 characterized by the above-mentioned.
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