JP4765053B2 - Heat resistant and high strength epoxy resin - Google Patents

Heat resistant and high strength epoxy resin Download PDF

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JP4765053B2
JP4765053B2 JP2004148422A JP2004148422A JP4765053B2 JP 4765053 B2 JP4765053 B2 JP 4765053B2 JP 2004148422 A JP2004148422 A JP 2004148422A JP 2004148422 A JP2004148422 A JP 2004148422A JP 4765053 B2 JP4765053 B2 JP 4765053B2
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epoxy resin
amino
quinoxaline
curing agent
aminophenyl
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文彦 阿久津
英哉 吉岡
直樹 宮下
真理 猪木
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国立大学法人 千葉大学
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Description

本発明は,耐熱性・高強度エポキシ樹脂に関するものである。  The present invention relates to a heat resistant and high strength epoxy resin.

エポキシ樹脂は接着性、接着強度、非収縮性、電気特性など優れているため、航空機、宇宙機器、自動車、スポーツ用品、レジャー用品などの用途で広く用いられている。  Epoxy resins are widely used in applications such as aircraft, space equipment, automobiles, sporting goods, and leisure goods because of their excellent adhesiveness, adhesive strength, non-shrinkage, and electrical properties.

一般的に、エポキシ樹脂の耐熱性を向上させるためには、硬化剤の構造中に芳香環を導入すれば効果があることがわかっている。従来、汎用のエポキシ樹脂の耐熱性硬化剤としては、4,4‘−ジアミノジフェニルスルホン(DDS)や4,4’−ジアミノジフェニルメタン(DDM)が知られている(たとえば特許文献1参照)。これらの硬化剤を用いて製造されたエポキシ樹脂硬化物は熱変形温度が196℃および156℃で室温では十分な接着強度を示す。しかし、従来のエポキシ樹脂硬化物を高温にさらすと、その接着強度は120℃付近から急速に低下し、180℃においてはDDM効果の場合で室温の67%、DDS効果の場合で室温の54%にまで低下する。このように従来のエポキシ樹脂硬化物では熱変形温度、接着力ともに耐熱性が十分でないという問題があった。
特開平7−258389号公報
In general, it has been found that introducing an aromatic ring into the structure of the curing agent is effective for improving the heat resistance of the epoxy resin. Conventionally, 4,4′-diaminodiphenylsulfone (DDS) and 4,4′-diaminodiphenylmethane (DDM) are known as heat-resistant curing agents for general-purpose epoxy resins (see, for example, Patent Document 1). The cured epoxy resin produced using these curing agents has a heat distortion temperature of 196 ° C. and 156 ° C. and exhibits sufficient adhesive strength at room temperature. However, when the conventional cured epoxy resin is exposed to a high temperature, its adhesive strength rapidly decreases from around 120 ° C., and at 180 ° C., 67% of the room temperature in the case of the DDM effect and 54% of the room temperature in the case of the DDS effect. Drop to. Thus, the conventional epoxy resin cured product has a problem that heat resistance is not sufficient for both the heat distortion temperature and the adhesive force.
JP 7-258389 A

本発明の目的は、高い耐熱性または、および接着強度を示すエポキシ樹脂硬化物を提供することである。  The objective of this invention is providing the epoxy resin hardened | cured material which shows high heat resistance or adhesive strength.

本発明は、(1)エポキシ樹脂(A)と芳香族アミン系硬化剤(B)をエポキシ基とアミノ基をモル比2:1で配合したエポキシ樹脂組成物。(2)芳香族アミン系硬化剤(B)がポリアミノフェニルキノキサリンを1〜100モル%含有している(1)のエポキシ樹脂組成物。(3)前記ポリアミノフェニルキノキサリンが、6−アミノ−2,3−ビス(p−アミノフェニル)キノキサリン、6−アミノ−2,3−ビス(m−アミノフェニル)キノキサリンまたは6−アミノ−2,3−ビス(アミノフェニル)キノキサリンであることを特徴とする(2)のエポキシ樹脂組成物。(4)(1)〜(3)のエポキシ樹脂組成物を硬化したエポキシ樹脂硬化物に関する。  The present invention is (1) an epoxy resin composition in which an epoxy resin (A) and an aromatic amine curing agent (B) are blended with an epoxy group and an amino group in a molar ratio of 2: 1. (2) The epoxy resin composition according to (1), wherein the aromatic amine-based curing agent (B) contains 1 to 100 mol% of polyaminophenylquinoxaline. (3) The polyaminophenylquinoxaline is 6-amino-2,3-bis (p-aminophenyl) quinoxaline, 6-amino-2,3-bis (m-aminophenyl) quinoxaline or 6-amino-2,3 -The epoxy resin composition according to (2), which is bis (aminophenyl) quinoxaline. (4) It relates to a cured epoxy resin obtained by curing the epoxy resin composition of (1) to (3).

本発明に係るエポキシ樹脂硬化剤は、キノキサリン環を有するポリアミンであって、アミノ基として6−アミノおよびp−アミノまたはおよびm−アミノまたはおよびアミノフェニル基を有するか、キノキサリン環を含むポリアミンと芳香族アミン系硬化剤(DDS、DDMおよびエーテル変性芳香族アミンおよびこれらの誘導体など)と混合したものである。芳香族アミン系硬化剤としては、例えば、フェニレンジアミン、ジアミノジフェニルメタン、2,2’−ビス−(アミノフェニル)プロパン、ジアミノジフェニルスルホン、トルエンジアミン等およびこれらの誘導体が挙げられ、単独または数種混合して使用することが出来る。  The epoxy resin curing agent according to the present invention is a polyamine having a quinoxaline ring, which has a 6-amino and p-amino or m-amino or and aminophenyl group as an amino group, or a polyamine containing a quinoxaline ring. Mixed with an aromatic amine-based curing agent (such as DDS, DDM and ether-modified aromatic amines and derivatives thereof). Examples of the aromatic amine-based curing agent include phenylenediamine, diaminodiphenylmethane, 2,2′-bis- (aminophenyl) propane, diaminodiphenylsulfone, toluenediamine, and the like, and derivatives thereof. Can be used.

本発明に係るエポキシ樹脂硬化物は、ポリアミノフェニルキノキサリンまたはポリアミノフェニルキノキサリンを含有する芳香族ポリアミンを硬化剤としエポキシ樹脂を硬化した硬化物であって、樹脂中に3置換キノキサリン構造を有することを特徴とする。3置換キノキサリン構造を下記に示す。

Figure 0004765053
The cured epoxy resin according to the present invention is a cured product obtained by curing an epoxy resin using polyaminophenylquinoxaline or an aromatic polyamine containing polyaminophenylquinoxaline as a curing agent, and has a tri-substituted quinoxaline structure in the resin. And A trisubstituted quinoxaline structure is shown below.
Figure 0004765053

本発明のエポキシ樹脂硬化剤は複素環を含み3置換構造を有しているため架橋密度が高くなり、高い熱変形温度およびまたは高い接着強度を達成することが出来る。  Since the epoxy resin curing agent of the present invention contains a heterocyclic ring and has a trisubstituted structure, the crosslinking density is increased, and a high heat distortion temperature and / or a high adhesive strength can be achieved.

以下、本発明を実施例に基づいて説明する。
エポキシ樹脂として旭電化工業製EP−4100(ビスフェノールAのジグリシジルエーテル)を用意した。また、硬化剤として下記のものを用意した。
ABAPQ:6−アミノ−2,3−ビス(4−アミノフェニル)キノキサリン
p−BAPQ:2,3−ビス(4−アミノフェニル)キノキサリン
DDS:4,4’−ジアミノジフェニルスルホン
これらの硬化剤の化学式を下記に示す。

Figure 0004765053
Hereinafter, the present invention will be described based on examples.
As an epoxy resin, EP-4100 (diglycidyl ether of bisphenol A) manufactured by Asahi Denka Kogyo was prepared. Moreover, the following were prepared as a hardening | curing agent.
ABAPQ: 6-amino-2,3-bis (4-aminophenyl) quinoxaline p-BAPQ: 2,3-bis (4-aminophenyl) quinoxaline DDS: 4,4′-diaminodiphenylsulfone Chemical formula of these curing agents Is shown below.
Figure 0004765053

上記エポキシ樹脂と各々の硬化剤をエポキシ基とアミノ基のモル比が2:1になるように混合し、加熱硬化してエポキシ樹脂硬化物を得た。
それぞれのエポキシ樹脂硬化物の熱変形温度を求めた。
熱変形温度は、JIS K−7196に従い、針入法によるTMA(Thermaomechanicalanalysis)を行うことによって測定した。
The epoxy resin and each curing agent were mixed so that the molar ratio of epoxy group to amino group was 2: 1 and cured by heating to obtain a cured epoxy resin.
The thermal deformation temperature of each cured epoxy resin was determined.
The heat distortion temperature was measured by performing TMA (Thermomechanical analysis) according to the penetration method according to JIS K-7196.

また、上記のエポキシ樹脂とABAPQとDDSをモル比で25:75、50:50、75:25の割合で混合した硬化剤を調整し、エポキシ基とアミノ基のモル比が2:1になるように混合し、加熱硬化しエポキシ硬化物を得た。
それぞれのエポキシ硬化物の熱変形温度をTMAで測定した。
In addition, a curing agent prepared by mixing the above epoxy resin, ABAPQ, and DDS in a molar ratio of 25:75, 50:50, and 75:25 is adjusted so that the molar ratio of epoxy group to amino group is 2: 1. The resulting mixture was cured by heating to obtain an epoxy cured product.
The thermal deformation temperature of each epoxy cured product was measured by TMA.

さらに、上記のエポキシ樹脂と各々の硬化剤をエポキシ基とアミノ基がモル比2:1になるように混合し、ステンレススチール製試験片に塗布した後、もう1枚のステンレススチール製試験片を圧着して加熱することにより接着した。これらの試料について引張試験を行うことにより、接着強度を測定した。
これらの結果を表1に示す。

Figure 0004765053
Further, the above epoxy resin and each curing agent were mixed so that the molar ratio of epoxy group and amino group was 2: 1 and applied to a stainless steel test piece, and then another stainless steel test piece was attached. Bonding was performed by pressing and heating. The adhesive strength was measured by performing a tensile test on these samples.
These results are shown in Table 1.
Figure 0004765053

表1の実施例1〜4から、ABAPQの含有率の増加に伴い熱変形温度が著しく向上していることがわかる。また実施例2〜4では熱変形温度が上昇しかつ接着強度が著しく改善されたことがわかる。本発明のエポキシ樹脂硬化物では3−置換キノキサリン構造を有するABAPQを用いて架橋密度を上げたことによって、上記のような高い耐熱性・高い接着力が得られた。  From Examples 1 to 4 in Table 1, it can be seen that the heat distortion temperature is remarkably improved as the ABAPQ content increases. In Examples 2 to 4, it can be seen that the heat distortion temperature increased and the adhesive strength was remarkably improved. In the cured epoxy resin of the present invention, the high heat resistance and high adhesive strength as described above were obtained by increasing the crosslinking density using ABAPQ having a 3-substituted quinoxaline structure.

本発明のエポキシ樹脂硬化物は、他の特性を維持しつつ、熱変形温度または、および接着強度が改善されているので、航空機、宇宙機器、自動車、スポーツ用品、レジャー用品などで耐熱性、接着強度が要求される用途で使用されることが期待される。  The epoxy resin cured product of the present invention has improved heat distortion temperature or adhesive strength while maintaining other properties, so that it has heat resistance and adhesion in aircraft, space equipment, automobiles, sports equipment, leisure goods, etc. It is expected to be used in applications where strength is required.

Claims (3)

1分子中に2個以上のエポキシ基を有するエポキシ樹脂(A)と芳香族アミン系硬化剤(B)をエポキシ基とアミノ基をモル比2:1で配合したエポキシ樹脂組成物であって、
前記芳香族アミン系硬化剤(B)はポリアミノフェニルキノキサリンであって、前記ポリアミノフェニルキノキサリンが、6−アミノ−2,3−ビス(p−アミノフェニル)キノキサリン、6−アミノ−2,3−ビス(m−アミノフェニル)キノキサリンまたは6−アミノ−2,3−ビス(アミノフェニル)キノキサリンであるエポキシ樹脂組成物。
An epoxy resin composition in which an epoxy resin (A) having two or more epoxy groups in one molecule and an aromatic amine curing agent (B) are blended with an epoxy group and an amino group in a molar ratio of 2: 1,
The aromatic amine curing agent (B) is polyaminophenylquinoxaline, and the polyaminophenylquinoxaline is 6-amino-2,3-bis (p-aminophenyl) quinoxaline, 6-amino-2,3-bis. An epoxy resin composition which is (m-aminophenyl) quinoxaline or 6-amino-2,3-bis (aminophenyl) quinoxaline.
前記ポリアミノフェニルキノキサリンを1〜100モル%含有している請求項1記載のエポキシ樹脂組成物。   The epoxy resin composition according to claim 1, containing 1 to 100 mol% of the polyaminophenylquinoxaline. 請求項1又は2記載のエポキシ樹脂組成物を硬化したエポキシ樹脂硬化物。 A cured epoxy resin obtained by curing the epoxy resin composition according to claim 1.
JP2004148422A 2004-04-15 2004-04-15 Heat resistant and high strength epoxy resin Expired - Lifetime JP4765053B2 (en)

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