Research On Glass Fiber Felts Coated With Graphene Oxide Modified Phenolic Resin Binder

The phenolic resin is widely used as binder for glass fiber felts because of the extremely advantages of corrosion-proof,high-temperature resistance and ageing resistant.In order to further improve the mechanical properties,hydrophobic properties and high-temperature resistance of phenolic resin,in this paper,the preparation method of graphene oxide modified phenolic resin binder by in-situ reduction reaction was used to solve the agglomeration problem of graphene in phenolic resin matrix and a reduced graphene oxide/phenolic resin binder with excellent performances was synthesized.Then the reduced graphene oxide/phenolic resin binder was applied to the fiber glass felts,resulting in the hydrophobic performance of fiber glass felts increased by 60%,the tear strength increased by 57%,the mass loss rate is reduced by 50.03% during 60 s vertical burning.The major research work and results of this paper are as follows:The binder with uniform dispersion,stable performancewas prepared by phenolic resin modified by graphene oxide,urea and melamine.The glass fiber monofilament was uniformly coated by the binder,and the stability at the overlap between the monofilaments was bonded;The in-situ polymerization mechanism of graphene oxide modified phenolic resin was analyzed and phenolic resin molecules could grow in situ on the surface of the reduced graphene oxide,impeding agglomeration between the lamellar layers;The high temperature resistance of reduced graphene oxide /phenolic resin binder was tested by thermogravimetric analyzer,tensile testing machine was used to test the tear strength of glass fiber felts,the contact angles and water absorption rate were characterized the hydrophobic properties of glass fiber felts,60 s vertical burning was used to test the flame resistance of glass fiber felts.The results showed that the addition of graphene oxide increased the carbon residue rate of phenolic resin binder to 77.90%,increased by 9.4%,and the optimal graphene oxide content was 0.4wt%,at this point,the hydrophobic performance increased by 60%,the tear strength increased by 57%,the flame retardant performance was increased by 50%.;And,the reduced graphene oxide/phenolic resin binder was used for preparing glass fiber felts,and pressurized heating curing treatment for 80 min.The results have shown that when the curing temperature is 160 ?,the hydrophobic,mechanical properties and high temperature resistance are the best,however,the effect on the thermal conductivity is not obvious;The last,taking graphene oxide content,curing temperature as the input value,water absorption,tear strength and burning damage length were taken as output values of glass fiber felts as the output value were used for BP neural network training.Hydrophobicity of glass fiber felts was predicted with the experimental data for the training sample,when the graphene oxide content is 0.4 wt %,curing temperature is 160 ?,the glass fiber felts have the best hydrophobic performance,mechanical properties and high temperature resistance.This project successfully prepared a new kind of glass fiber felts with low thermal conductivity,excellent hydrophobic performance,high tearing strength and excellent high temperature resistance,which can be predicted to have important application value in aerospace,navigation and other fields.