Preparation and Properties of Coating for Improving Heat and Salt Wet Resistance of Combustible Cartridges,Propellants, Explosives, Pyrotechnics

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Preparation and Properties of Coating for Improving Heat and Salt Wet Resistance of Combustible Cartridges
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-03-25 , DOI: 10.1002/prep.201900409
Yuxin Zhang ₁ , Xi Zeng ₁ , Jinxiu Xiao ₁ , Chengkai Pu ₁ , Haiyue Shi ₁ , Zhenggang Xiao ₁

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A combustible cartridge is made of nitrocellulose, wood fibers and resin. It is easy to absorb moisture in a high‐humidity environment and the NC‐based materials may self‐ignite after storage at higher temperature for a long time. A large number of studies have been carried out to improve the surface protection performance of combustible cartridges usually using a general nitrocellulose varnish. But the heat‐resistance of the nitrocellulose varnish coating is poor. In this article, we develop a composite coating that improves the heat‐resistance and salt wet resistance of combustible cartridges. The new composite coating was prepared by adding BN/silane composite particles and non‐ionic surface active reagent Tween 80 into the nitrocellulose varnish by an optimized composition. The high temperature resistant performance and salt tolerance properties effect of the new composite coating for combustible cartridge were investigated by thermogravimetric experiment, muffle furnace experiment and salt wet resistance test. Compared with the control sample, the coated sample by the new composite coating was able to stand for 138 s at a high temperature of 220 °C, increasing the high temperature resistance time by a maximum percentage of 50 %. In a high‐salt environment, the final water absorption percentage was only 0.2944 % when the coated sample is immersed in a high salt content water at 26 °C for three days, increasing the salt wet resistance by a maximum percentage of 70 %. Results show that the new coating using BN/silane composite particle can improve the high temperature resistant performance and salt tolerance properties of combustible cartridges effectively.

中文翻译：

提高可燃弹药筒耐热和耐盐湿性的涂料的制备和性能

可燃药筒由硝化纤维素，木纤维和树脂制成。在高湿度环境中很容易吸收水分，而NC基材料在高温下长时间保存后可能会自燃。通常使用普通的硝酸纤维素清漆进行了大量研究以改善可燃药筒的表面防护性能。但是硝酸纤维素清漆涂层的耐热性很差。在本文中，我们开发了一种复合涂层，可改善可燃弹药筒的耐热性和耐盐湿性。通过将BN /硅烷复合颗粒和非离子表面活性剂Tween 80通过优化的组成添加到硝酸纤维素清漆中来制备新的复合涂层。通过热重试验，马弗炉试验和耐盐湿性试验研究了新型可燃药筒复合涂料的耐高温性能和耐盐性能。与对照样品相比，采用新的复合涂层涂覆的样品能够在220°C的高温下放置138 s，从而将耐高温时间最多延长了50％。在高盐环境中，将涂层样品在26°C的高盐含量水中浸泡三天后，最终吸水率仅为0.2944％，最大提高了70％的耐盐湿性。

更新日期：2020-03-25

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