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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of High Solid Content Waterborne Polyurethanes with Controllable Bimodal Particle Size Distribution
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Synthesis of High Solid Content Waterborne Polyurethanes with Controllable Bimodal Particle Size Distribution

机译：具有可控制的双峰粒度分布的高固含量水性聚氨酯的合成

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摘要

A series of waterborne polyurethane dispersions were synthesized by one-pot reaction and step-wise reaction, respectively. The effects of synthetic methods and DMPA content on the particle size distribution (PSD), solid contents and viscosity were studied by laser particle size analyzer, Brookfield viscometer and TEM analysis. High solid content and low viscosity waterborne polyurethanes (WPUs) with controllable bimodal PSD were prepared by one-pot reaction using 2,2-dimethylol propionic acid (DMPA) as the only self-emulsifier. Meanwhile, 40% solid content WPUs with unimodal PSD were obtained by step-wise reaction at the same formula. With the increment of DMPA content, the ratio of large particles to small particles decreased and two peaks of the particle size finally became one peak by one-pot reaction while the PSD remained unimodal by step-wise reaction. The reason leading to the difference of PSD between one-pot reaction and step-wise reaction was analyzed and the relationships among PSD, viscosity and solid content were discussed.
机译：分别通过一锅法和逐步反应合成了一系列水性聚氨酯分散体。通过激光粒度分析仪，布鲁克菲尔德粘度计和TEM分析研究了合成方法和DMPA含量对粒度分布（PSD），固体含量和粘度的影响。采用2,2-二羟甲基丙酸（DMPA）作为唯一的自乳化剂，通过一锅法反应制得了具有可控双峰PSD的高固含量和低粘度水性聚氨酯（WPU）。同时，在相同的配方下，通过逐步反应，获得了具有单峰PSD的40％固含量的WPU。随着DMPA含量的增加，大颗粒与小颗粒的比率降低，并且通过一锅法反应，粒径的两个峰最终变为一个峰，而通过逐步反应，PSD保持单峰。分析了导致一锅法和逐步反应之间PSD差异的原因，并探讨了PSD，粘度和固含量之间的关系。

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