含短氟碳链结构水性环氧树脂的制备及性能

Preparation and Properties of Waterborne Epoxy Resin with Short Fluorocarbon Chain Structure

摘要:

采用环氧树脂（E-44）、异佛尔酮二异氰酸酯（IPDI）、1,1,1,3,3,3-六氟-2-丙醇（HFIP）、二乙烯三胺（DETA）为主要原料，合成了一种含短氟碳链结构的水性环氧乳化型固化剂，并与氟改性环氧树脂乳化配制成一种环保、疏水型含短氟碳链结构的水性环氧树脂。采用接触角测定仪、FTIR、AFM、TGA和DMA对该树脂的结构、固化膜的表面性能、热性能及力学性能进行表征和考察。结果表明：与无氟体系相比，含氟结构改性的环氧体系的耐热性和疏水性得到一定程度的提高，较低的氟含量2.4%（氟元素在环氧固化物中的质量分数，下同）即可到达疏水的效果。随着氟含量增加到5.1%，环氧树脂固化膜的铅笔硬度从3H提高到5H，但是附着力降低了1级，玻璃化转变温度从68℃提高到了80℃，同时表面粗糙程度也得到提高，使得水接触角进一步增大到最佳的98°，并且此时固化膜得到了最佳的热稳定性，得到最大热分解温度为373.1℃。

Abstract:

A waterborne self-emulsification epoxy curing agent modified by the short fluorocarbon chain was synthesized successfully based on epoxy resin(E-44), isophorone diisocyanate (IPDI), 1, 1, 3, 3,3- hexafluoro-2-propanol(HFIP),and diethylenetriamine (DETA) as main raw materials, and it was emulsified further with fluorine-containing epoxy resin to form an environment-friendly hydrophobic waterborne epoxy resin. contact angle testing, FTIR, AFM, TGA, DMA and other analytical methods were used to characterize and study the structure of the resin, surface properties, thermal properties and mechanical properties of the cured film results show that the heat resistance and hydrophobicity of the fluorine-containing epoxy were improved to some extent compared with the fluorine-free system, and lower fluorine content 2.4% (the mass fraction of fluorine in epoxy cured substance) can reach the hydrophobic effect. With the fluorine content increases to 5.1%, the hardness of epoxy resin cured flim increased from 3H to the5H, but the adhesion decreases by 1 level, and the glass transition temperature increased from 68℃ to 80℃.The surface roughness is also improved, so that the water contact angle is further increased to an optimum 98°. The cured film obtained the best thermal stability, and the maximum thermal decomposition temperature was 373.1 °C.