改性h-BN/聚氨酯丙烯酸酯涂料的制备与性能

利用水热法制备羟基化六方氮化硼（BNNSs），采用异佛尔酮二异氰酸酯（IPDI）和丙烯酸羟乙酯（HEA）在其表面进行接枝得到功能化六方氮化硼（Fh-BN）。然后将得到的Fh-BN掺入有机硅改性的聚氨酯丙烯酸酯（PUA）涂料中，成功制备出改性h-BN/聚氨酯丙烯酸酯涂料。研究了水热时间、温度对BNNSs硼羟基含量的影响，利用XPS分析得出水热反应最佳反应条件为180℃、12h，B—OH质量分数达到5.97%。通过机械性能、综合热分析、耐水性、涂层交流阻抗和Tafel极化曲线进行测试分析，掺杂0.75%Fh-BN涂膜硬度达到3H，耐冲击性50cm，柔韧性0.5mm；与未掺杂前涂层相比，吸水率降低4.96%；涂层耐热性提高，T_50%提升了6℃；耐水测试浸泡168h后涂膜无变化；电化学测试表明：0.75%Fh-BN涂层阻抗R₁达到1.818×10⁹Ω·cm²，比原有涂层提升了两个数量级，E_corr由-0.4886V正移至-0.32124V，I_corr由2.5552×10^-7A/cm²降低至1.5555×10^-8A/cm²。Fh-BN的引入显著提升了涂层的机械性能、热稳定性和耐腐蚀性。

Preparation and performance of modified h-BN/polyurethane acrylic coatings

In this paper, hydroxylated hexagonal boron nitride (BNNSs) was prepared by hydrothermal method. The functionalized hexagonal boron nitride (Fh-BN) was obtained by grafting isophorone diisocyanate (IPDI) and hydroxyethyl acrylate (HEA) on the surface of BNNSs. The resulting Fh-BN was adding into the PUA coating and the modified Fh-BN/polyurethane acrylic coating was successfully prepared. The effect of time and temperature on BNNSs B—OH content was studied respectively, and the B-OH content was 5.97% in the optimal hydrothermal reaction of 180℃ for 12h. The modified Fh-BN/polyurethane acrylic coating was evaluated by mechanical performance test, water resistance, coating impedance and Tafel polarization curve test. When 0.75% Fh-BN was added to the coating, the hardness reached 3H with the flexibility of 0.5mm and the impact resistance of 50cm. The water absorption of coating reduced by 4.96%, Fh-BN improved heat resistance with T_50% arising 6℃ and Immersion without change in water 168h, while E_corr shifted positively from -0.4886V to -0.32124V and I_corr decreased from 2.5552×10^-7A/cm² to 1.5555×10^-8A/cm². The mechanical properties, water resistance and corrosion resistance of the coating were significantly improved by Fh-BN.