Flame retardant modified starch adhesive made by crosslinking with phosphorus containing citrate based polyamines has...

The preparation of new environmentally friendly materials from renewable biomass has become the focus of research. However, the development of materials with both high bond strength and water resistance remains a challenge due to the presence of a large number of hydrophilic functional groups in biomass materials. In this work, GAS was prepared by linking long chains of starch and gelatin using maleic anhydride as a "bridge", and branched phosphorus containing citric acid based polyamines (HC-TCPP) had been developed. HC-TCPP can tandemise the crosslinked network structure (GAS) of starch and gelatin, and a wood-bonded material, GAS-HC-TCPP, was successfully prepared. The introduction of HC-TCPP not only enhances the water resistance and adhesive properties of the bonding material, but also provides flame retardant properties. According to the results of the limiting oxygen index (LOI = 27.4 %), laminated plywood coated with wood-bonding material (GAS-HC-TCPP) has significant flame-retardant properties. Meanwhile, the introduction of HC-TCPP regulates the pH of the bonding material, alleviates the corrosion of laminated plywood caused by excessive acidity of the bonding material, and strengthens the bending resistance of laminated plywood. This work provides new ideas for the preparation of starch based wood-bonded materials with excellent mechanical properties and flame retardancy.