Abstract: Using waterborne polyurethane as matrix and ultra-high molecular weight polyethylene (UHMWPE) fiber as reinforcement, unidirectional and orthogonal composite soft bulletproof layer was prepared. Based on ballistic penetration test and non-destructive testing, the effects of resin modulus, resin content, fiber development degree and other technological parameters on the elastic resistance of the soft bulletproof layer of advanced composites were studied. The results show that the UHMWPE composites prepared with low resin content, low modulus resin and proper placement rate present better ballistic penetration performance. The low resin content increases the fiber proportion, resulting in more fiber bearing capacity per unit surface density. The low modulus resin can reduce the stiffness of the composite, allowing more fibers to pull out and break in the affected area. Although the faster arrangement rate can improve the production efficiency, it will generate more tension and damage the fiber during the production process. By analyzing the influence of various factors on the ballistic properties of composites, the technological parameters of ballistic composites can be better designed and the soft bulletproof layer of advanced composites can be prepared.

Key words: process parameters, ultra high molecular weight polyethylene fiber, waterborne polyurethane, ballistic performance, composites