Abstract

The paper presents a new, non-pollution pyrophosphate flame retardant microcapsules which was prepared by in situ polymerization with hemicellulose maleate (HCMA), urea, formaldehyde and pyrophosphate. The HCMA was obtained through the hemicellulose extracted from the waste liquid of regenerated cellulose fiber and modified by maleic anhydride. The pyrophosphate flame retardant microcapsules were degradable and environment friendly, and they could effectively provide compatibility with matrix and flame resistance. The preparation and properties of flame retardant microcapsules were determined. Under the preparation conditions of which the core–shell ratio was 2:1.5 (mol:mol), pH was 3.5 and temperature was 55 °C, the embedding quantity reached to 66.7%, and the average particle size of flame retardant microcapsules was about 20 μm. The flame retardant microcapsules exhibited good thermal stability. Thermal kinetics analysis was studied based on the Coats–Redfern equation, and the changes of activation energy during the thermal degradation were determined. The pyrophosphate flame retardant microcapsules were added into the regenerated cellulose fiber stock solution to prepare the film sample. By adding 15% flame retardant microcapsules, the LOI of film sample reached 29.1%, and the UL-94 on vertical combustion could reach UL-94-V-0. The film sample with pyrophosphate flame retardant microcapsules showed excellent flame retardant performance.

Graphic abstract

The preparation on shell of flame retardant microcapsules

中文翻译：

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马来酸半纤维素制备焦磷酸盐阻燃微胶囊的性能及应用研究

摘要

本文介绍了一种新的，无污染的焦磷酸盐阻燃剂微胶囊，它是通过与马来酸半纤维素（HCMA），尿素，甲醛和焦磷酸盐原位聚合制备的。HCMA是通过从再生纤维素纤维废液中提取的半纤维素经马来酸酐改性而获得的。焦磷酸盐阻燃微胶囊可降解且环保，可有效提供与基质和阻燃性的相容性。确定了阻燃微胶囊的制备和性能。在核壳比为2：1.5（mol：mol），pH为3.5，温度为55°C的制备条件下，包埋量达到66.7％，阻燃微胶囊的平均粒径约为20微米 阻燃微胶囊表现出良好的热稳定性。基于Coats-Redfern方程对热动力学分析进行了研究，并确定了热降解过程中活化能的变化。将焦磷酸盐阻燃剂微胶囊添加到再生的纤维素纤维储备溶液中以制备膜样品。通过添加15％的阻燃微囊，薄膜样品的LOI达到29.1％，垂直燃烧的UL-94可以达到UL-94-V-0。具有焦磷酸盐阻燃微胶囊的薄膜样品显示出优异的阻燃性能。将焦磷酸盐阻燃剂微胶囊添加到再生的纤维素纤维储备溶液中以制备膜样品。通过添加15％的阻燃微囊，薄膜样品的LOI达到29.1％，垂直燃烧的UL-94可以达到UL-94-V-0。具有焦磷酸盐阻燃微胶囊的薄膜样品显示出优异的阻燃性能。将焦磷酸盐阻燃剂微胶囊添加到再生的纤维素纤维储备溶液中以制备膜样品。通过添加15％的阻燃微囊，薄膜样品的LOI达到29.1％，垂直燃烧的UL-94可以达到UL-94-V-0。具有焦磷酸盐阻燃微胶囊的薄膜样品显示出优异的阻燃性能。

图形摘要

阻燃微胶囊壳的制备