高固含量核壳结构阳离子水性聚氨酯的制备及表征,Journal of Applied Polymer Science

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高固含量核壳结构阳离子水性聚氨酯的制备及表征
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-10-10 , DOI: 10.1002/app.54766
Minghao Mu ₁ , Xinqiang Liu ₁ , Haisong Bi ₁ , Zheng Wang ₁ , Chengduo Qian ₁ , Baojian Yao ₂ , Yifan Liu ₂ , Xiufen Liu ₂ , Xue Li ₂

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本研究制备了高固含量的核壳结构阳离子水性聚氨酯（WPU）分散体。为此，由聚四亚甲基醚二醇（PTMG）、异佛尔酮二异氰酸酯（IPDI）、蓖麻油（CO）和1,4-丁二醇（BDO）合成预聚物A，而不结合亲水基团。由PTMG、IPDI、CO、BDO和N-甲基二乙醇胺(MDEA)制备具有亲水基团的预聚物B。将预聚物A和预聚物B混合、中和、乳化，可以生成具有核壳结构的WPU分散体。结果表明，通过该技术生成的WPU分散体呈现乳状外观，pH值在5.30范围内。至 5.60。预聚物A和预聚物B的最佳组合（比例为5:5）得到的分散体具有最高的固含量（50.4%）、最低的粘度（69 mPa·s）和最窄的粒径分布。随着预聚物A与预聚物B比例的降低，WPU薄膜的拉伸强度降低，而断裂伸长率和玻璃化转变温度升高。此外，最初与水的接触角不是增加而是减小。然而，预聚物 A 和 B 比例的改变并未对 WPU 薄膜的热稳定性能产生任何显着影响。

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Preparation and characterization of high solid content cationic waterborne polyurethane with core-shell structures

In this study, core-shell structured cationic waterborne polyurethane (WPU) dispersions with high solid content were prepared. To this end, prepolymer A was synthesized from polytetramethylene ether glycol (PTMG), isophorone diisocyanate (IPDI), castor oil (CO) and 1,4-butanediol (BDO) without integration of the hydrophilic groups. Prepolymer B with hydrophilic groups was prepared from PTMG, IPDI, CO, BDO and N-methyldiethanol amine (MDEA). WPU dispersion with a core-shell structure could be generated by mixing, neutralizing, and emulsifying of the prepolymer A and the prepolymer B. The results indicated that the generation of WPU dispersions through this technique exhibited a milky appearance while the pH values range from 5.30 to 5.60. The optimal combination of prepolymer A and prepolymer B (at a ratio of 5:5) resulted in a dispersion with the highest solid content (50.4%), lowest viscosity (69 mPa·s), and narrowest particle size distribution. As the proportion of prepolymer A to prepolymer B decreases, the tensile strength of WPU film reduces while the elongation at break and glass transition temperature increases. Moreover, initially the contact angle with water was decreased instead of increase. However, modifications in a ratio of prepolymer A and B was not showed any significant impact on the thermal stability performance of the WPU films.

更新日期：2023-10-10

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