当前位置：
X-MOL 学术
›
Propellants Explos. Pyrotech.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Development and Characterization of a Photopolymeric Binder for Additively Manufactured Composite Solid Propellant Using Vibration Assisted Printing
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-03-23 , DOI: 10.1002/prep.201900387 Monique S. McClain 1, 2 , Aaron Afriat 1, 3 , Jeffrey F. Rhoads 1, 3, 4 , Ibrahim Emre Gunduz 5 , Steven F. Son 1, 2, 3
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-03-23 , DOI: 10.1002/prep.201900387 Monique S. McClain 1, 2 , Aaron Afriat 1, 3 , Jeffrey F. Rhoads 1, 3, 4 , Ibrahim Emre Gunduz 5 , Steven F. Son 1, 2, 3
Affiliation
|
An emerging area of research in the energetic materials community is the development of new manufacturing methods, such as additive manufacturing (AM), that can be used to selectively deposit energetic materials into complex geometries, which provides more control over how the energetics perform during combustion. Although ammonium perchlorate (AP) composite propellant has been 3D printed at solids loadings that are comparable to traditional formulations (85 wt.%) with vibration assisted printing (VAP), traditional propellant binders such as hydroxyl terminated polybutadiene (HTPB) are poorly suited for 3D printing large or complex structures because propellant made with HTPB deforms easily under its own weight and isocyanates do not crosslink HTPB fast enough to facilitate rapid polymerization after deposition. Ultraviolet (UV) curable photopolymers have been used for many types of AM processes, such as stereolithography, and there is a variety of commercially available binders with customizable chemical and mechanical properties. However, little work has been done to characterize the optimal cure characteristics of UV curable binders that are compatible with composite propellants. Furthermore, it has also been speculated that aluminized propellants may not be amenable to UV curing since opaque particles impede UV transmission. In this work, the curing properties of a photopolymer that has similar characteristics to HTPB with AP and aluminum were quantified. The ingredients consisted of a polybutadiene urethane acrylate and hexanediol diacrylate (HDDA) polymer binder, which could be mixed in various ratios to control properties such as adhesion to particle surfaces and viscosity, as well as bisacylphosphine oxide (BAPO) which is a well‐known photoinitiator for deep curing in the coatings industry. The effect of wavelength, exposure time, and intensity on cure depth were quantified on the neat photopolymer. In addition, the effect of aluminum content (up to 20 %) on the cure depth of propellant with a solids loading of 85 wt.% was measured. It was shown that at higher intensities (∼20 mW/cm2), aluminized propellants could be cured to depths on the order of 1–2 mm, which is greater than the typical layer thickness of propellants printed via VAP (∼0.25 mm). In addition, it was shown that there were no visible interfaces in aluminized propellant (15 % aluminum) that was cured layer‐by‐layer. The approach taken could be applied to a wide range of other granular, opaque composite materials, such as metal, ceramic, and fibrous mixtures.
中文翻译：
用振动辅助印刷技术开发和表征用于增材制造复合固体推进剂的光聚合物粘合剂
高能材料领域的一个新兴研究领域是新制造方法的开发，例如增材制造（AM），可用于将高能材料选择性地沉积到复杂的几何形状中，从而提供了对高能在燃烧过程中的性能的更好控制。尽管高氯酸铵（AP）复合推进剂的固含量可以与传统配方（85 wt。％）进行振动辅助印刷（VAP）进行3D打印，但传统的推进剂粘合剂（例如羟基封端的聚丁二烯（HTPB））非常不适合3D打印大型或复杂结构，因为用HTPB制成的推进剂在自重作用下很容易变形，而异氰酸酯的交联速度不够快，不足以促进沉积后的快速聚合。紫外线（UV）固化型光敏聚合物已用于多种类型的AM工艺（如立体光刻），并且有多种具有可定制化学和机械性能的市售粘合剂。但是，很少有工作来表征与复合推进剂相容的紫外线固化型粘合剂的最佳固化特性。此外，还已经推测镀铝的推进剂可能不适合UV固化，因为不透明的颗粒阻碍了UV透射。在这项工作中，定量了具有与HTPB和AP和铝相似特性的光敏聚合物的固化性能。成分由聚丁二烯氨基甲酸酯丙烯酸酯和己二醇二丙烯酸酯（HDDA）聚合物粘合剂组成，可以各种比例混合以控制性能，例如对颗粒表面的粘附力和粘度，以及双酰基氧化膦（BAPO），后者是涂料行业中用于深固化的著名光引发剂。波长，曝光时间和强度对固化深度的影响在纯净光敏聚合物上进行了定量。此外，测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm 测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm 测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm2），可以将镀铝的推进剂固化到大约1-2毫米的深度，该深度大于通过VAP打印的推进剂的典型层厚（约0.25毫米）。此外，还显示了逐层固化的镀铝推进剂（15％铝）中没有可见的界面。所采用的方法可以应用于多种其他颗粒状，不透明的复合材料，例如金属，陶瓷和纤维混合物。
更新日期：2020-03-23
中文翻译：
用振动辅助印刷技术开发和表征用于增材制造复合固体推进剂的光聚合物粘合剂
高能材料领域的一个新兴研究领域是新制造方法的开发，例如增材制造（AM），可用于将高能材料选择性地沉积到复杂的几何形状中，从而提供了对高能在燃烧过程中的性能的更好控制。尽管高氯酸铵（AP）复合推进剂的固含量可以与传统配方（85 wt。％）进行振动辅助印刷（VAP）进行3D打印，但传统的推进剂粘合剂（例如羟基封端的聚丁二烯（HTPB））非常不适合3D打印大型或复杂结构，因为用HTPB制成的推进剂在自重作用下很容易变形，而异氰酸酯的交联速度不够快，不足以促进沉积后的快速聚合。紫外线（UV）固化型光敏聚合物已用于多种类型的AM工艺（如立体光刻），并且有多种具有可定制化学和机械性能的市售粘合剂。但是，很少有工作来表征与复合推进剂相容的紫外线固化型粘合剂的最佳固化特性。此外，还已经推测镀铝的推进剂可能不适合UV固化，因为不透明的颗粒阻碍了UV透射。在这项工作中，定量了具有与HTPB和AP和铝相似特性的光敏聚合物的固化性能。成分由聚丁二烯氨基甲酸酯丙烯酸酯和己二醇二丙烯酸酯（HDDA）聚合物粘合剂组成，可以各种比例混合以控制性能，例如对颗粒表面的粘附力和粘度，以及双酰基氧化膦（BAPO），后者是涂料行业中用于深固化的著名光引发剂。波长，曝光时间和强度对固化深度的影响在纯净光敏聚合物上进行了定量。此外，测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm 测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm 测量了铝含量（最高20％）对固含量为85％（重量）的推进剂固化深度的影响。结果表明，在更高的强度下（〜20 mW / cm2），可以将镀铝的推进剂固化到大约1-2毫米的深度，该深度大于通过VAP打印的推进剂的典型层厚（约0.25毫米）。此外，还显示了逐层固化的镀铝推进剂（15％铝）中没有可见的界面。所采用的方法可以应用于多种其他颗粒状，不透明的复合材料，例如金属，陶瓷和纤维混合物。
京公网安备 11010802027423号