Study On Synthesis And Properties Of Tri (4-hydroxypheny) Methane Epoxy Resin With Low Viscosity

Tri (4-hydroxypheny) methane epoxy resin (TMGE) is a kind of trifunctional epoxy resin that contains benzene ring structure and the heat resistance of the cured product is superior to the bisphenol A type epoxy resin. Therefore, TMGE has a broad application prospects in the field of electronic packaging. But the high viscosity of TMGE seriously affects its operation process and material properties. To reduce viscosity of TMGE, the synthesis process of TMGE with low viscosity and related properties were studied firstly. Then a kind of hyperbranched polyester epoxy resin (AHBP) and 1,4-butanediol diglycidyl ether (BDDGE) were used as dilution agents to study the properties of TMGE.The main studies and progress of this paper are as follows:1. TMGE with low viscosity was synthesized by tri (4-hydroxyphenyl) methane and epichlorohydrin (ECH). The structure of TMGE was characterized by FT-IR,’H-NMR and GPC. The type and amount of catalyst, etherification temperature, feeding methods, closed-loop temperature and alkali concentration in synthesis process of TMGE with low viscosity were studied by single factor method and orthogonal test. The viscosity and epoxy value of TMGE prepared under optimum process conditions were 7500～7800cp (25℃) and 0.55～0.58 mol/100g, respectively.2. The AHBP with low viscosity was synthesized by trimethylolpropane, trimellitic anhydride and ECH. FT-IR was used for characterization of AHBP. The influences of the closed-loop temperature, the type of alkali, reaction time on epoxy value of AHBP were investigated by orthogonal test method. The viscosity of AHBP synthesized under optimum process conditions was about 1500cp (25℃), and epoxy value was about 0.188 mol/100g, which was increased by 37% compared to the relevant paper. The results show that the epoxy value of AHBP improves significantly under optimized process.3. The curing reaction process of three kinds of TMGE curing systems was studied by non-isothermal differential scanning calorimetry (DSC) using methyl nadic anhydride (MNA) as the curing agent and AHBP, BDDGE as dilution agent. Then the curing conditions of TMGE systems were determined. The results show that the reaction activation energy of epoxy resin systems were reduced by BDDGE, while AHBP increased by AHBP.4. The performances of TMGE/MNA were tested by the thermogravimetric analysis (TGA), electronic universal testing machine, refractometer and so on. And the influences of the AHBP and BDDGE as the diluent on the properties of TMGE/MNA system were investigated. The results showed that TMGE/MNA tensile strength, flexural strength, refractive index and thermal stability had excellent performance. The reactive diluent BDDGE, AHBP significantly reduced TMGE/MNA viscosity. The mechanical properties, thermal stability, refractive index of TMGE/MNA/AHBP were better than TMGE/MNA/BDDGE.