一种基于氢氧化镁的环氧树脂固化剂的制备与表征

Synthesis and Characterization of Based on Magnesium Hydroxide Curing Agents for Epoxy Rresins

摘要:

该文制备了一种氨基功能化氢氧化镁（DETA-AA-MH）并将其用作环氧树脂固化剂。采用FTIR、XRD、13C CP-MAS、纳米粒径分析仪、SEM和TGA对DETA-AA-MH的化学结构、形貌以及热稳定性进行了表征，并通过FTIR和DSC分析得到环氧树脂（DGEBA）和DETA-AA-MH发生固化反应的最佳质量分数分别为84.03%和15.97%，热固化实验分析得到最佳固化温度分别为80和110 ℃。LOI测试分析结果表明,DGEBA/DETA-AA-MH较DGEBA/DETA的LOI提高了10.15%。采用SEM和EDS对环氧树脂燃烧后的炭残留物进行分析，结果表明，在燃烧过程中DETA-AA-MH促进保护碳层的形成。机械性能测试表明，DGEBA/DETA-AA-MH（质量分数15.97%）与DGEBA/DETA（质量分数7.38%）对比发现其弯曲强度、弯曲模量和冲击强度分别提高了669.70%、33.12%、228.57%。

Abstract:

A novel amino-functionalized magnesium hydroxide (DETA-AA-MH) was synthesized and used as curing agents for epoxy resins．DETA-AA-MH was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray power diffraction (XRD), Solid state nuclear magnetic resonance(SSNMR), nano particle analyzer, field-emission scanning electron microscopy(FESEM) and thermogravimetric analysis (TGA). Crosslinking behavior was found by FTIR and differential scanning calorimetry (DSC), the best mass ratio of curing reaction was epoxy resin(DGEBA, 84.03%) and DETA-AA-MH1 (5.97%), the optimum curing temperature were 80 and 110 ℃. Flame retardance of the EPs was evaluated by LOI tests, compare the data of DGEBA/DETA with DGEBA/DETA-AA-MH, the LOI of DGEBA/DETA-AA-MH was improved by 10.15%. SEM and EDS was employed to investigate the burning residues of EP, confirming that DETA-AA-MH could promote the formation of a protective char layer during burning. The experiments for determining the mechanic properties of DETA-AA-MH cured EPs were also conducted, which indicated that compared to EP (mass fraction 7.38% DETA), Comparing with, the flexural strength, flexural modulus and impact strength of EP(mass fraction 15.97% DETA-AA-MH) were efficiently increased by 669.70%, 33.12%, 228.57%, respectively.