摘要
As a key engineering adhesive for wood architecture and interior finishes, melamine-formaldehyde resin (MF) is critically constrained by intrinsic brittleness, insufficient hydrophobicity, and limited long-term flame-retardant efficiency. Herein, this study successfully engineered a category of multifunctional MF (PMF) via in-situ co-polymerization of a novel amino-grafted polyborosiloxane (N-PBS). The obtained PMF integrates B-O linkages and the robust siloxane skeleton into the rigid MF network, exhibiting excellent material processability, characterized by a light color, transparency, good storage stability, and suitable viscosity. Crucially, the incorporation of N-PBS improved fire resistance of PMF, as manifested by significantly enhanced thermal stability. For PMF containing 15 wt% N-PBS (15 %-PMF), the residual char yield was elevated from 19.7 % to 23.9 % due to the synergistic effect of boron and silicon in promoting the rapid formation of a dense, protective char layer. This structural defense extended the burn-through time of 15 %-PMF decorative panel by 64.6 s, and suppressed the total smoke production (TSP) and total heat release (THR) by 82.1 % and 5.9 %, respectively, compared to pure MF. Importantly, the intrinsically flexible siloxane backbone and its low surface energy significantly enhanced the mechanical and interfacial properties. The PMF with 10 wt % N-PBS (10 %-PMF) was considered mechanically optimal, yielding a 20.0 % increase in flexibility (verified by 4.8 mm curling radius) with 7.0 % and 16.0 % enhancements in dry and wet bonding strengths, respectively. The surface robustness was significantly enhanced, evidenced by a 14.6° increase in water contact angle with a 26.4 % enhancement, the cigarette burn resistance and surface water vapor resistance both of 4 level. The designed multifunctional engineering PMF in our work holds great promise as an advanced, high-performance composite for sustainable and functional flame-retardant interior finishes.
危险品化学品经营许可证（带存储）