Study On Toughening Of High-Performance Phenolic Foam Insulation Materials

Phenolic foam is a new kind of material of high-performance fireproof insulation, which has incomparable advantages compared with the traditional polystyrene foam insulation. Phenolic foam has fire resistance, dimensional stability, burning smokeless and non-toxic material and many unique advantages, it will be used in many future industry area. However, there are some flaws with phenolic foam, such as brittle, easily dregs and other shortcomings. Therefore, this paper has been selected suitable toughening and flame retardants focus on modification of phenolic resin on the basis of laboratory work, and then prepare a high-performance fire retardant modified phenolic foam insulation.This paper investigate the hydrolysis and characterization of silane coupling agent KH-560, probes into the hydrolysis of ethyl silicate to produce nano silicon dioxide (SiC>2) particles, and silane coupling agent KH-560 modified nano silica (SiO2) particles, which has good characteristics of hydrophobic and dispersed uniformly. The hydrolysis product of silane coupling agent KH-560 and the silica (SiO2) nanoparticles modified with silane coupling agent KH-560 as modifier modified phenolic resin, then the phenolic foam was prepared with modified phenolic resin. Fourier transform infrared spectroscopy (FT-IR) qualitative analysis was carried out on the modifier and the modified resin, SEM、TG/DTA、e LOI、WSM-5KN electronic universal testing machine and XJU-22 cantilever type impact testing machine were used to characterize modified Phenolic foam.Silane coupling agent KH-560 contains epoxy group and a long flexible chain. The hydrolysis of KH-560 produce a long flexible chain with silanol, epoxy ring produce hydroxy group at the same time which can react with phenolic resin. The hydrolysis product of silane coupling agent KH-560 with long flexible chain as toughening agent modified phenolic foam. A long flexible chain replace the rigid part of the methylene in resin, flexible chain increases, the macromolecular crosslinking density of resin was reduced. The toughness and mechanical strength of phenolic foam was significantly improved when KH-560 was 7%(wt), its thermal stability was only slightly lower, the carbon residue retention rate increase 1-3% compare with pure phenolic foam at same temperature, it still keep good thermal stability and good flame retardancy.In this paper, nano-SiO2 particle was modified with the silane coupling agent KH-560. Connect the organic molecular chain to nano SiO2 surface at high active point, increased the stability of SiO2 sol particles and has SiO2 colloidal particle surface grafted reaction active group, as well as preventing agglomeration of particles, increase the dispersion of the inorganic particle in organic phase. The modified phenolic foam was prepared with the modified SiO2 nanoparticles as toughening agent. The high temperature resistant and flame retardant performance was increased greatly on the basis of increasing the toughness and mechanical properties of phenolic foamd when modified nano-SiO2 percentage was 1.5%(wt).