潮湿表面用环氧树脂固化剂的合成及其性能

Synthesis and properties of epoxy resin curing agent for wet surface

以混合胺和脂肪酸为主要原料,制备了环氧树脂固化剂CTH311,采用傅里叶红外光谱及胺值、粘度、凝胶时间及力学性能测试等考察了原料比例、最高反应温度对固化剂性能的影响,并将其与聚醚胺类THC2002固化剂复配,考察了固化剂配比、稀释剂种类和用量对体系浇铸体力学和粘接性能的影响。结果表明,CTH311的粘度为520 mPa·s,胺值(KOH)为494 mg/g,凝胶时间为51 min。PQE610稀释剂质量分数为10%(基于DGEBA和稀释剂总质量),CTH311在CTH311/THC2002固化剂体系中的质量分数为60%时,浇铸体的拉伸强度可达72 MPa,断裂伸长率8.55%,压缩强度101 MPa,在空气及潮湿表面的拉伸剪切强度分别为22 MPa和14 MPa,完全满足GB 50728—2011对潮湿环境中胶粘剂的技术要求。该产品在隧道衬砌裂缝等领域具有很大的应用市场。

The epoxy resin curing agent CTH311 was prepared using mixed amine and fatty acid as the main raw materials. The effects of raw material ratio and maximum reaction temperature on the performance of curing agent were investigated by Fourier transform infrared spectroscopy and tests of amine value,viscosity,gel time and mechanical properties. The CTH311 was compounded with polyetheramine THC2002 curing agent,and the effects of curing agent ratio,diluent type and dosage on the mechanical and adhesive properties of the castings of the system were investigated. The results showed that the viscosity of CTH311 was 520 mPa·s, the amine value(KOH)was 494 mg/g,and the gel time was 51 min. When the mass fraction of PQE610 diluent was 10%(based on the total mass of DGEBA and diluent),and the mass fraction of CTH311 in the CTH311/THC2002 curing agent system was 60%,the tensile strength,elongation at break and compressive strength of the castings could reach 72 MPa,8.55% and 101 MPa,respectively. The tensile shear strength on air and wet surfaces was 22 MPa and 14 MPa,respectively,which fully met the technical requirements of GB 50728—2011for adhesives in humid environments. This product had a large application market in the fields of tunnel lining cracks.