To improve the performance of waterborne materials, this study attempts to prepare a novel water-dispersible isocyanate crosslinking agent based on plant-based castor oil. The intermediate maleated castor oil and water-dispersible isocyanates with different R values [n(NCO)/n(OH)] are prepared and characterized by FTIR and ¹H NMR. The viscosity test, isocyanate content titration, particle size analysis, and the morphologies indicate that the optimal condition for the water-dispersible isocyanates (e.g., best storage stability and particle size distribution) is at R value = 40. The mechanical test proves that the water-dispersible isocyanates can greatly improve the bonding strength and water resistance of wood adhesives, showing an increase of wet strength to be as high as 146 % and 506 % for urea-formaldehyde resin and white latex, respectively. The castor oil-mediated water-dispersible isocyanate system opens a novel avenue to synthesize waterborne crosslinking agent for applications in adhesives, coatings, and structural materials.

为提高水性材料的性能，本研究试图制备一种基于植物性蓖麻油的新型水分散性异氰酸酯交联剂。制备了具有不同R值[n(NCO)/n(OH)]的中间体马来化蓖麻油和水分散性异氰酸酯，并通过FTIR和¹核磁共振。粘度测试、异氰酸酯含量滴定、粒度分析和形貌表明，水分散性异氰酸酯的最佳条件（例如，最佳储存稳定性和粒度分布）为 R 值 = 40。机械测试证明水分散异氰酸酯能大大提高木材胶粘剂的粘接强度和耐水性，对脲醛树脂和白乳胶的湿强度提高分别高达146%和506%。蓖麻油介导的水分散性异氰酸酯体系为合成用于粘合剂、涂料和结构材料的水性交联剂开辟了一条新途径。