Preparation and Performance Study of Na2S2O8-Modified Melamine Foam

Herein, expandable melamine resin was used as the matrix material, while Na2S2O8 was employed as a formaldehyde scavenger to fabricate low-formaldehyde melamine foam via microwave foaming method. The primary objective was to investigate the determination of Na2S2O8 addition content ratio on the formaldehyde released and the resulting mechanical properties of foam. Our experiments demonstrate that sulfate free radicals ( SO₄^ • - ) resulted from Na2S2O8 not only can efficiently oxidize free formaldehyde but also promote the cross-linking reaction. The dual effect significantly reduces the residual content of formaldehyde and improves the comprehensive performance of foam. The formaldehyde content of the foam can be decrease to 167 mg/kg—59.2% reduction ratio compared with the unmodified sample. The results show that the tensile strength can reach to 52 kPa and simultaneously realizing the tear strength of 42 N/m, the compressive strength of 9.7 kPa and tensile strength of 52 kPa. Our research provides a theoretical basis and technical support for the green and sustainable preparation of low-formaldehyde and high-performance melamine foam, develop a new way for expanding the application of melamine foam in fields such as interior decoration and precision electronic packaging.