Manipulating the melt dripping of thermoplastics makes a fire scenario more or less dangerous. Yet, a detailed understanding of this phenomenon has remained a question mark in studies of the flammability of plastics. In this work, the individual and collective impacts of additives on the dripping behaviour of polyamide 6 (PA6) were studied. A set of materials compounded with melamine cyanurate (MCA) and glass fibre (GF) was investigated. Under UL 94 vertical test conditions, the dripping during first and second ignition was quantified and investigated in detail. The number, size and temperature of the drops were addressed, and the materials and their drops evaluated with respect to such aspects as their averaged molecular weight, thermal decomposition and rheological properties. PA6 with V-2 classification improved to V-0 with the addition of MCA, and achieved HB in the presence of GF. PA6/GF/MCA achieved V-2. Non-flaming drops of PA6/MCA consisted of oligomeric fragments. Flaming drops of PA6/GF showed a more pronounced decomposition of PA6 and an increased GF content. The dripping behaviour of PA6/GF/MCA can be understood as a combination of the influence of both additives. The results showed nicely that dripping under fire is neither a straightforward material property nor a simple additive influence, but the complex response of the material influenced by the interaction and competition of different phenomena.

操作热塑性塑料的熔滴会造成火灾或多或少的危险。然而，对这种现象的详细了解仍是塑料可燃性研究中的一个问号。在这项工作中，研究了添加剂对聚酰胺6（PA6）滴落行为的个体和集体影响。研究了一组与三聚氰胺三聚氰胺（MCA）和玻璃纤维（GF）混合的材料。在UL 94垂直测试条件下，对第一次和第二次点火期间的滴落进行了量化和详细研究。讨论了液滴的数量，大小和温度，并就其平均分子量，热分解和流变性质等方面对材料及其液滴进行了评估。通过添加MCA，将V-2分类的PA6改进为V-0，并在存在GF的情况下达到HB。PA6 / GF / MCA达到V-2。PA6 / MCA的非燃烧液滴由寡聚片段组成。PA6 / GF的火焰状液滴显示PA6分解更明显，且GF含量增加。PA6 / GF / MCA的滴落行为可以理解为两种添加剂影响的组合。结果很好地表明，火灾下的滴落既不是直接的材料特性也不是简单的加性影响，而是材料的复杂响应受不同现象的相互作用和竞争的影响。PA6 / GF / MCA的滴落行为可以理解为两种添加剂影响的组合。结果很好地表明，火灾下的滴落既不是直接的材料特性也不是简单的加性影响，而是材料的复杂响应受不同现象的相互作用和竞争的影响。PA6 / GF / MCA的滴落行为可以理解为两种添加剂影响的组合。结果很好地表明，火灾下的滴落既不是直接的材料特性也不是简单的加性影响，而是材料的复杂响应受不同现象的相互作用和竞争的影响。