以端羟基聚丁二烯（HTPB）、聚己二酸1，4-丁二醇酯（PBA2000）、异佛尔酮二异氰酸酯（IPDI）、1，4-丁二醇（BDO）、乙二胺（EDA）、2，2-二羟甲基丙酸（DMPA）为主要原料合成预聚体，用三乙胺（TEA）进行中和，得到HTPB改性水性聚氨酯。在预聚过程中固定异氰酸基团（—NCO）与多元醇中的羟基（—OH）的物质的量比为2.3∶1，DMPA的含量为3.8%，通过调控HTPB在多元醇中的占比，最终制得固体含量实测值为38%的水性聚氨酯乳液。研究HTPB在多元醇中的占比对水性聚氨酯的乳液粒径、乳液储存稳定性以及固化成膜后的耐水性、力学性能、热稳定性、低温柔韧性的影响。结果表明：随着HTPB在多元醇中占比的逐渐增大，水性聚氨酯乳液的平均粒径也随之增大，稳定性逐渐降低，玻璃化转变温度先下降后上升，最低可达-46.84 ℃，制得的聚氨酯薄膜的吸水率先上升再下降，耐水性则是先下降再上升，断裂伸长率与低温柔韧性均随着HTPB在多元醇中占比的增大而提高。

The prepolymer was synthesized using hydroxyl-terminated polybutadiene (HTPB), poly(butylene adipate) (PBA2000), isophorone diisocyanate (IPDI), 1,4-butanediol (BDO), ethylenediamine (EDA), and 2,2-dimethylolpropionic acid (DMPA) as the main raw materials. The prepolymer was then neutralized with triethylamine (TEA) to obtain HTPB-modified waterborne polyurethane. In the prepolymerization process, the molar ratio of isocyanate group (—NCO) and hydroxyl group (—OH) in the polyol was fixed 2.3∶1, the content of DMPA was 3.8%, and the waterborne polyurethane emulsion with a solid content of 38% (measured value) was finally prepared by adjusting the proportion of HTPB in the polyol. The effects of HTPB content in polyols on the particle size of emulsion, storage stability of emulsion, water resistance, mechanical properties, thermal stability were studied. The results show that with the gradual increase of the proportion of HTPB in polyols, the average particle size of waterborne polyurethane emulsion also increases, the stability gradually decreases, the glass transition temperature decreases first and then increases, and the lowest glass transition temperature can reach -46.84 ℃. The water absorption of the produced polyurethane films first increases and then decreases, while the water resistance first decreases and then increases, and the elongation at break and low-temperature flexibility both increase with the increase of the proportion of HTPB in the polyol.