The preparation and characteristics of high puncture resistant composites inspired by natural silk cocoon

Bombyx mori cocoon, a natural nonwoven material has excellent puncture resistance and unique structure. Based on the structure of cocoon, this paper designed a biomimicry composite, aiming to improve the static puncture resistance through polyurethane impregnated treatment. In this article, four different types of polyurethane (TPU 85 A, TPU 90 A, PEUR 855 A, PEUR 991 A) are selected and five concentration gradients (5, 7, 9, 11, 13 wt%) are set. The tensile and static puncture resistance of the impregnated composites and damaged morphology after puncture are systematically studied. The results show that the static puncture resistance of nonwovens impregnated by polyurethane is improved obviously. This study provides a new way to design better static puncture resistant materials.