Hydrophobic medical thermoplastic polyurethane alloy
A thermoplastic polyurethane, hydrophobic technology, used in catheters and other directions, can solve problems such as limited sources, and achieve the effects of large supply, wide sources and high hardness
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Example Embodiment
[0015] Example 1: The A-component medical-grade hydrophobic thermoplastic polyurethane Tecoflex EG-72D and the B-component medical-grade hydrophobic thermoplastic polyurethane Tecoflex EG-85A were respectively weighed at a weight ratio of 90 / 10. Tecoflex EG-72D is produced by Lubrizol, with a Shore hardness of 67D. Tecoflex EG-85A is produced by Lubrizol, with a Shore hardness of 77A. The two are mixed in a high-speed mixer for 5 minutes, and then transferred to a hopper-type dehumidification dryer for drying at 80°C for 4-6 hours to obtain a dry mixture. Add the dry mixture to the twin-screw extruder for melting and mixing. The screw diameter of the extruder is 36mm, and the ratio of length to diameter is 28 / 1. Set the temperature of the extruder from the material port to the die to be 140- The temperature of the die is 180°C, and the temperature of the die is 180°C. The blend is extruded, cooled and pelletized through the die to obtain a polyurethane alloy. Tests show that ...
Example Embodiment
[0016] Example 2: The A-component medical-grade hydrophobic thermoplastic polyurethane Elastollan 1174D and the B-component medical-grade hydrophobic thermoplastic polyurethane Elastollan 1185A were respectively weighed at a weight ratio of 55 / 45. Elastollan 1174D is produced by BASF, with a Shore hardness of 73D. Elastollan 1185A is produced by BASF and has a Shore hardness of 85A. The two are mixed in a high-speed mixer for 5 minutes, and then transferred to a hopper-type dehumidifying dryer for drying at 110°C for 3-5 hours to obtain a dry mixture. The dry mixture is added to the twin-screw extruder for melting and mixing. The screw diameter of the extruder is 36mm, the ratio of length to diameter is 28 / 1, and the temperature from the material port to the die of the extruder is set to 190- 215°C, the die temperature is 215°C, the blend is extruded through the die, cooled, and pelletized to obtain a polyurethane alloy. Tests show that the flexural modulus (GB / T9341-2000) of...
Example Embodiment
[0017] Example 3: The A-component medical-grade hydrophobic thermoplastic polyurethane Pellethane 2363-75D and the B-component medical-grade hydrophobic thermoplastic polyurethane Pellethane 2363-80A were respectively weighed at a weight ratio of 70 / 30. Pellethane 2363-75D is produced by Lubrizol, with a Shore hardness of 76D. Pellethane 2363-80A is produced by Lubrizol, with a Shore hardness of 81A. The two were mixed in a high-speed mixer for 5 minutes, and then transferred to a hopper-type dehumidifying dryer for drying at 110°C for 3-5 hours to obtain a dry mixture. The dry mixture is added to the twin-screw extruder for melting and mixing. The screw diameter of the extruder is 36mm, the ratio of length to diameter is 28 / 1, and the temperature from the material port to the die of the extruder is set to 190- 215°C, the die temperature is 215°C, the blend is extruded through the die, cooled, and pelletized to obtain a polyurethane alloy. Tests show that the flexural modulus...
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