绿色海藻酸钠基和层状双氢氧化物阻燃剂的制备，用于提高聚丙烯的阻燃性能。

Fabrication of green alginate-based and layered double hydroxides flame retardant for enhancing the fire retardancy properties of polypropylene.

机构信息

College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China.

出版信息

Carbohydr Polym. 2020 Apr 15;234:115891. doi: 10.1016/j.carbpol.2020.115891. Epub 2020 Jan 20.

DOI:10.1016/j.carbpol.2020.115891

PMID:32070511

Abstract

An efficient and bio-based alginate pillared hydrotalcite (SA@LDHs) was fabricated via calcination-reconstruction manner with sodium alginate (SA) and hydrotalcite (LDHs-C), and used as novel flame retardant for polypropylene (PP). The morphologies and combustion properties of SA@LDHs and its hybrid with PP composites (PP/SA@LDHs) had been characterized by SEM, TGA, cone calorimetry, LOI and UL-94 measurements. With 30 wt% loading, the SA@LDHs achieved a LOI value of 30.9 % and a UL-94 V-0 rating, whereas the LDHs-C exhibited only LOI value of 27.6 % and a UL-94 V-1 rating. The peak heat release rate, total heat release and total smoke production of PP/SA@LDHs were 260.8 kW m, 61.3 MJ m and 8.2 m, respectively, which presented declines of 69.2 %, 42.8 % and 32.2 % compared with those of Neat PP. These improvements could be attributed to the presence of the radical-trapping effect of SA, which leading to promote PP chains to participate in the carbonization process.

摘要

通过采用海藻酸钠（SA）和水滑石（LDHs-C）的煅烧-重构方法，制备了一种高效、基于生物的海藻酸钠插层水滑石（SA@LDHs），并将其用作新型阻燃剂用于聚丙烯（PP）。通过 SEM、TGA、锥形量热仪、LOI 和 UL-94 测试对 SA@LDHs 及其与 PP 复合材料（PP/SA@LDHs）的形貌和燃烧性能进行了表征。当添加 30wt%的 SA@LDHs 时，其 LOI 值达到 30.9%，并通过 UL-94 V-0 等级测试，而 LDHs-C 仅具有 27.6%的 LOI 值和 UL-94 V-1 等级。PP/SA@LDHs 的峰值热释放速率、总热释放和总烟释放量分别为 260.8kW/m、61.3MJ/m 和 8.2m，与纯 PP 相比，分别下降了 69.2%、42.8%和 32.2%。这些改进可以归因于 SA 的自由基捕获效应的存在，这促使 PP 链参与碳化过程。