Syntheses and Mechanical Properties of HighlyTough Epoxy Resins Modified with Polyurethane forOne-component Curing Type with Dicyandiamide―For Composite Materials and Adhesives―

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  • ジシアンジアミド1 液硬化型強靭性ポリウレタン変性エポキシ樹脂の合成と物性―複合材・接着剤用として―
  • ジシアンジアミド 1エキ コウカガタ キョウジンセイ ポリウレタン ヘンセイ エポキシ ジュシ ノ ゴウセイ ト ブッセイ : フクゴウザイ ・ セッチャクザイヨウ ト シテ

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<p>Highly tough epoxy resins modified with polyurethane for composite materials and adhesives of onecomponent</p><p>curing type using dicyandiamide were synthesized by in-situ method. As the 1st reaction，</p><p>bisphenol F type epoxy resin， polypropylene glycol and 4,4’-diphenylmethane-diisocyanate were charged</p><p>at 16 levels and reacted at 120 ℃ for 2 hours to synthesize urethane-pre-polymers. As the 2nd reaction，</p><p>1,4-buthane-di-ol of a chain-extender and the above urethane-pre-polymers were reacted at 120 ℃ for 2</p><p>hours to synthesize 16 levels of epoxy resins modified with polyurethanes having different rations of Hard</p><p>Segment : Soft Segment : Segment with n=1body of bisphenol F type epoxy resin added to the polyurethanes’</p><p>end. These epoxy resins modified with polyurethanes， bisphenol F type epoxy resin of an agent to control</p><p>the concentration of polyurethane， dicyandiamide of a hardener and 1,3,5-triazine-2,4,6（1H,3H,5H）-trione，</p><p>compounded with 6-2-（2-methyl-1H-　imidazol-1-yl）ethyl-1,3,5-triazine-2,4-diamine （1:1） of a curing</p><p>accelerator were mixed to prepare a one-component resin composition， which was then pre-baked at 120 ℃</p><p>for 45 minutes and post-baked at 150 ℃ for 45 minutes to obtain cured products. As a result of measuring the</p><p>properties， it was found that a cured product of an epoxy resin modified with 10 wt.% polyurethane， which</p><p>has 5 wt.% Hard Segment， 2.3 wt.% Soft Segment and 52.7 wt.% of Segment with n=1body of bisphenol F type</p><p>epoxy resin added to the polyurethanes’ ends， showed excellent properties suitable for composite materials</p><p>and adhesives of one-component curing type using dicyandiamide， i.e.， the fracture toughness was 1.87</p><p>MPa･m0.5， the tensile fracture elongation was 7.2 %， the tensile fracture strength was 67.6 MPa， the tensile</p><p>modulus was 2.2 GPa and the Tg（ DSC） was 132 ℃.</p>

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