UHMWPE Blended Yarn

Zhejiang QianXiLong Special Co., Ltd and Longkui New Material Co., Ltd are highly regarded companies located in Yongkang Economic Development Zone, Zhejiang, China. These companies were created by the renowned Qianxi Group, a prominent investment group. QianXiLong Special Fiber (QXL) is an exceptional high-tech enterprise that focuses on research, development, and manufacturing of UHMWPE (Ultra High Molecular Weight Polyethylene) fibers. Our company boasts three plants situated in Yongkang, Longyou, and Shanxi, with a combined capacity of 4000 tons. Our fibers come in a wide range of superfine 8D to 2400D, and even up to 40000D, with high tenacity fibers (tenacity exceeding 42 cN/dtex) being our specialty. On the other hand, Longkui New Material Co., Ltd (Longkui) is a top-tier high-tech enterprise that concentrates on the development of UHMWPE protective materials.

Heat resistance
UHMWPE blended yarn has a lower heat resistance than many other types of high-strength fibers and a lower melting point (297° to 305° F) than many common polymers. All grades will have the same heat resistance and melting point because of the nature of UHMWPE blended yarn. As an example, UHMWPE blended yarn is a good option for ballistic body armor used in security and police work, but is not a good choice for the manufacture of firefighters' gear. But all grades of UHMWPE blended yarn would have similar heat resistance level.

Tensile strength
UHMWPE blended yarn yarns are 40% stronger than aramid yarns. They also have high abrasion resistance, even under pressure, and are 15 times more resistant to abrasion than carbon steel. If strength and preventing breakage is of critical importance, evaluate your yarn selection to make sure it meets your tensile strength requirements. UHMWPE blended yarn is known for its high tensile strength - but always check product specs for exact tensile properties. Strengths vary depending on the grade, and exactly how each grade is drawn out. A skydiver doesn't want their gear to break under high stress, and your company certainly wouldn't want to be involved in the creation of any faulty materials that could cause an accident down the line.

Durability
Depending on the grade, UHMWPE blended yarn usually has a molecular mass between 3.5 and 7.5 million amu, which is quite high. UHMWPE blended yarn also has a very high cut resistance. It also has a very low coefficient of friction, comparable to polytetrafluoroethylene (PTFE), meaning it is well-suited for uses that involve motion and sliding. A common example is bulk handling equipment, which experiences constant repetitive motions.

High-performance fiber yarns are widely used in the field of ballistic protection as fabric and reinforced composites due to their exceptional properties. When a yarn is impacted transversely by a projectile, a transverse wave is generated at the impact point and travels to the end. A faster transverse wave is desirable to dissipate energy more quickly, thereby enhancing the impact performance of the fabric or composite. However, experimental studies on yarns have shown that individual fibers within a yarn do not experience impact simultaneously. Instead, these fibers progressively fail within the first few microseconds. Additionally, during the manufacturing process, fibers are prone to slipping, leading to loosing yarns and fiber entanglement, which hinders smooth production, particularly in the weaving of high-density impact-resistant fabrics. Furthermore, experiments have revealed that when woven fabrics are post-treated with resin to create coated fabrics, some fibers may exhibit uneven resin infiltration. Under these circumstances, the yarn behaves as a collection of separate fiber components, which affects transverse wave propagation and potentially diminishes the overall impact resistance of the structure. Research has indicated that thermoplastic polyurethane (PU) is a preferable filler polymer due to its excellent processability and chemical stability. Notably, its molecular chain contains flexible segments that enhance resistance to bending, impact, and energy absorption. To improve the ability of UHMWPE blended yarn fibers and the overall impact resistance of its composites, the fibers are coated to enhance the wettability of the core yarns in subsequent fabric resin post-treatment.

The tensile properties of fiber yarns play a crucial role in determining the ballistic performance of fabrics and composites, and are therefore vital for the design of bulletproof equipment. Most research efforts have focused on investigating the tensile properties of single yarns, with limited studies on composite yarns with coating layers. It discovered that the strain rate of UHMWPE blended yarn yarn' tensile properties exhibited high sensitivity to low strain rate (3.3 × 10−5 to 0.33/s). However, these tensile properties were independent of 0.33–400/s. Wang et al. It reported that the tensile strength of E-glass yarns gradually increased (90–1700 s−1), while the strain to failure increased with strain rate (below 1110 s−1), and decreased with strain rate (exceeded 1300 s−1) observed that the breaking stress of PVA yarns increased with increasing strain rate (0.01–1500 s−1). However, the failure strain of PVA fiber yarns significantly decreased with increasing strain rate (0.01–270 s−1), but increased with increasing strain rate (270–1500 s−1). It found that basalt yarns exhibited a significant strain rate effect, with increasing strain rate resulting in higher tensile strength and lower strain to failure. It conducted research on that the destructive stress and failure strain of the material gradually increased (0.01–180 s−1). In the case of composite yarns with coating layers. It discovered that coated carbon nanotube yarns exhibited higher ultimate tensile strengths compared to pure carbon nanotube yarns when subjected to in situ loading. Additionally, the coated yarns demonstrated more cohesive fracture behavior in comparison to uncoated yarns. It focused on the coating of UHMWPE blended yarn fibers with PU and found that stretching the composite yarn under quasi-static conditions significantly increased its strength. However, neither of these studies involved dynamic loading conditions. Fabrics were impacted by a projectile, poor frictional properties between projectile-yarn and inter-yarn resulted in the yarns slipping over the projectile. Therefore, no yarn failure was observed in their experiments. It reported that spraying coatings on UHMWPE blended yarn fabrics significantly increased the coefficient of friction of coated samples compared to neat counterparts, and improved the impact resistance of the fabrics.

The current lack of research on the dynamic mechanical behavior of composite yarns and the limited understanding of the toughening mechanism of polyurethane (PU) on yarn under dynamic loading. To address this gap, this study impregnates ultra-high molecular weight polyethylene (UHMWPE blended yarn) yarn material with a PU solution and subsequently cure it to create PU/PE composite yarns.