Preparation And Properties Of TPU Blend Alloys

The thermoplastic polyurethane elastomer have many excellent physical properties, and also have the characteristics of rubber and plastics. In recent years,The polyurethane industry has entered the period of rapid development, but the high costs of production and the defects of certain performance limit its wide further application. Recently, the domestic and foreign researchers have done a lot of experiments in improving the performance of TPU and expanding the use and reducing the overall cost of production and other aspects. The researches of modified TPU on reports also continue to increase, and it’s not uncommon, especially in the regard of the development of polyurethane elastomers blend alloys.The research has studied the technical background of modified TPU, and combined with the current state of the development of TPU.By adding the appropriate compatibility agent, select ing the appropriate blending process and the appropriate conditions,we can improve TPU’s interface compatibility with other materials, as well as improve the mechanical properties and the processing properties of thermoplastic polyurethanes.We have prepared TPU/PA6 blend alloys, TPU/TPEE blend alloys, polyether-based TPU/ polyester-based TPU blends alloys, selected the appropriate cross-linking agent and assistant cross-linking agent to prepare crosslinked TPU, for improving the oil resistance and pressure compression set of TPU, and ultimately developing the thermoplastic polyurethane materials which have excellent overall performance.The results showed that:(1)We prepared TPU/PA6 blend alloy with the method of mechanical blending. When the blending proportion is 70/30, the TPU is ER-95A, the overall performance of the blend material is better than others. Adding HDPE-g-MAH can improve the adhesion of the two phases, thereby improving the compatibility of the two materials. After blending, the oil resistance properties of the materials is improved and the compression set of TPU is reduced.(2) We prepared TPU/TPEE blend alloy with the method of mechanical blending. When the TPU/TPEE is 80/20, the TPU is NX-95A, the overall performance of the blend material is better than others. Adding 701 can improve the compatibility of TPEE and TPU.It can improve the overall performance of blend material. After blending, the oil resistance properties of the materials is improved and the compression set of TPU is reduced.(3) We blend the polyester-based TPU (ER-95) with the polyether-based TPU (NX-95). When the blending proportion is 70/30, the overall performance of the blend material is better than others.When selecting HDPE-g-MAH as the compatibilizer, the compatibility of the two materials can be improved. The overall performance of the materials can be improved,too. After blending, the oil resistance properties of the material is improved and the compression set of TPU is reduced.(4) suitable crosslinking can improve the oil resistance and reduce the compression set of TPU materials. Selecting the appropriate cross-linking agent and assistant crosslinking agent and the appropriate condition can make the material relatively remained high mechanical properties. Under certain conditions, the crosslinking agent (BIPB) can make the molecular chains of TPU form a crosslinked structure,.And the adding of assistant cross-linking agent (TAIC) can significantly improve the degree of crosslinking structure. After crosslinking, the oil resistance properties of the materials is improved and the compression set of TPU is reduced.