利用新工艺制得羟基化氮化硼（ OH-BN）：通过 NaOH辅助物理球磨，将六方氮化硼（h-BN）剥离成纳米片的同时初步进行羟基化改性，利用水热法在 NaOH溶液中进一步羟基化改性，酸洗干燥后得到 OH-BN。使用不同二异氰酸酯和亲水扩链剂合成了多种水性聚氨酯（ H-WPU），利用 OH-BN和 H-WPU制备 OH-BN/H-WPU涂料，通过丝网印花法制得羟基化六方氮化硼导热聚氨酯涂层（ OH-BN/H-WPU涂层）。通过红外光谱仪（ FT-IR）、透射电镜（ TEM）和热重分析仪（ TGA）等对 OH-BN进行了测试表征，并研究了 OH-BN/H-WPU涂层导热系数的影响因素。结果表明： OH-BN成功被羟基化且保留了 h-BN的典型六边形结构，在水及 H-WPU中的分散性提升。当使用异佛尔酮二异氰酸酯和 2，2-双（羟甲基）丙酸合成的 H-WPU、OH-BN用量为 H-WPU质量的 20%时，所制得的 OH-BN/H-WPU涂层导热性能最好，导热系数为 0. 278 3 W/（m·K），相较纯 H-WPU涂层的导热系数提升了 0. 077 3 W/（m·K）。

The novel method to produce hydroxylated boron nitride（OH-BN）∶ the hexagonal boron nitride（h-BN）was exfoliated into nanosheets by NaOH-assisted physical ball milling with preliminary hydroxylation modification， and further hydroxylation modification was carried out in NaOH solution by hydrothermal method followed by acid washing and drying to obtain OH-BN. Using different diisocyanate and hydrophilic chain extenders，a variety of waterborne polyurethane（H-WPU）were synthesized，which，combined with OH-BN，was used to prepare hydroxylated hexagonal boron nitride（OH-BN/H-WPU）coatings. And hydroxylated hexagonal boron nitride thermal conductive polyurethane coating was prepared by screen printing method. The OH-BN was characterized by FT-IR，XRD，TEM，TGA，and the factors affecting the thermal conductivity OH-BN/H-WPU coating were investigated. The results showed that OH-BN was successfully hydroxylated and the typical hexagonal structure of h-BN was retained，and the dispersing performance in water and waterborne polyurethanes（H-WPU） was improved. When H-WPU synthesized with isophorone diisocyanate and 2，2-bis（hydroxymethyl）propionic acid was used，and the mass of OH-BN was 20% of H-WPU，the prepared OH-BN/H-WPU coating showed the best thermal conductivity of 0. 278 3 W/（m·K），which was 0. 077 3 W/（m·K）higher than that of the pure H-WPU coating.