A kind of preparation method of anti-scattering polyurethane elastic fiber
A polyurethane elastic and anti-loosening technology, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problem of easy adhesion of melt-spun spandex, poor unwinding performance, and spandex's inability to combine hot-melt adhesion and excellent Mechanical properties and other issues, to achieve good heat resistance and high temperature resistance, prevent further expansion, and inhibit off-line effects
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[0025] 1). Preparation of high melting point polyurethane
[0026] Heat the diisocyanate to 50-80 degrees to fully melt, and at the same time heat and mix the polyether diol and the small molecule diol. These materials are injected into the feeding area of the twin-screw extruder according to the proportion, and after being fully mixed and reacted in the high-temperature mixing area, they are extruded through the screw and enter the underwater pelletizer to make granular solids. The granular solid is dehydrated and dried with a dryer, and heat-cured at a temperature of 80-120 degrees to obtain high-melting-point polyurethane.
[0027] 2). Preparation of low melting point polyurethane
[0028] Heat diisocyanate to 50-80 degrees to fully melt, and at the same time heat and mix polyester diol, small molecule diol and small molecule monohydric alcohol. These materials are injected into the feeding area of the twin-screw extruder according to the proportion, and after being f...
Embodiment 1
[0044] Heat MDI to 50 degrees to fully melt, heat and mix PTMG2000 with ethylene glycol (EG) and hydroquinone bishydroxyethyl ether (HQEE). These materials are injected into the feeding zone of the twin-screw extruder in proportion, and the molar ratio of MDI, PTMG, EG, and HQEE is 1.05 / 0.5 / 0.4 / 0.1. After these materials are fully mixed and reacted in the 160-degree mixing zone, they are extruded through the screw and enter the underwater pelletizer to make granular solids. After drying to remove water, place it at a temperature of 80 degrees for 8 hours of heat aging treatment to obtain high melting point polyurethane.
[0045] Heat MDI to 50 degrees to fully melt, heat and mix PBA2000, 1,4-butanediol (BDO) and methanol (MT). These materials are injected into the feeding zone of the twin-screw extruder in proportion, the molar ratio of MDI, PBA, and BDO is 0.9 / 0.7 / 0.35, and the amount of MT is 500ppm of the molar amount of MDI. After these materials are fully mixed and reac...
Embodiment 2
[0048] Heat IPDI to 58 degrees to fully melt, heat and mix PTMG2000, BDO and hydroquinone bishydroxyethyl ether (HQEE). These materials are injected into the feeding zone of the twin-screw extruder in proportion, and the molar ratio of IPDI, PTMG, BDO, and HQEE is 1.10 / 0.6 / 0.2 / 0.2. . After these materials are fully mixed and reacted in the 160-degree mixing zone, they are extruded through the screw and enter the underwater pelletizer to make granular solids. After drying to remove water, place it at 100°C for 6 hours of thermal aging treatment to obtain high melting point polyurethane.
[0049] Heat MDI to 50 degrees to fully melt, heat and mix PEA2000, 1,4-butanediol (BDO) and n-propanol (NPA). These materials are injected into the feeding zone of the twin-screw extruder in proportion, the molar ratio of MDI, PEA, and BDO is 0.95 / 0.55 / 0.45, and the amount of NPA is 800ppm of the molar amount of MDI. After these materials are fully mixed and reacted in a 140-degree mixing z...
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