Extrusion foaming thermoplastic polyurethane elastomer bead and preparation method thereof
A thermoplastic polyurethane, extrusion foaming technology, applied in the field of foaming materials, can solve problems such as environmental pollution, high cost, and complicated foaming process, and achieve the effects of no environmental pollution, stable quality, and uniform density distribution
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[0027] For the preparation of raw material thermoplastic polyurethane elastomer particles: usually isocyanate, a compound containing active hydrogen with a molar mass of 500-10000g / mol and a chain extender with a molar mass of 50-500g / mol are mixed to produce, and a catalyst is added during the production; The following examples describe the preferred starting materials for producing thermoplastic polyurethane particles in the present invention:
[0028] Isocyanates include aliphatic, cycloaliphatic, aromatic and araliphatic; preferably diisocyanates, such as toluene diisocyanate (TDI), diphenylmethane-2,2'-, 2,4'- or 4,4'di Isocyanate (MDI), 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (HMDI), 1 ,5-Naphthalene diisocyanate (NDI), p-phenylene diisocyanate (PPDI), 1,4-cyclohexane diisocyanate (CHDI), cyclohexane dimethylene diisocyanate (HXDI), particularly preferably diphenylmethane -4,4' Di...
Example Embodiment
[0035] In Example 1, 100Kg of the thermoplastic polyurethane (TPU) particles A shown in Table 1, 0.5Kg of talc, and 0.05Kg of antioxidant 1010 were mixed uniformly, and then the above mixture was poured into an extruder to obtain pellets suitable for foaming Finally, put the above-mentioned particles into a single-stage single-screw extruder, the extrusion speed of the material is controlled at 80Kg per hour, the injection rate of supercritical carbon dioxide is controlled at 0.8Kg per hour, the die pressure is 1Mpa, and the die temperature The temperature of the underwater pelletizer is 165℃, and the water temperature of the underwater pelletizer is controlled at 70℃; materials can be continuously added according to the above-mentioned component ratios for continuous production, and the foaming density of the particles obtained is 0.306g / cm 3 .
Example Embodiment
[0036] In Example 2, 100Kg of the thermoplastic polyurethane (TPU) particles B shown in Table 1, 0.01Kg of talc, and 0.2Kg of antioxidant 1010 were mixed uniformly, and then the above mixture was poured into an extruder to obtain a pellet suitable for foaming Finally, put the above-mentioned particles into a single-stage single-screw extruder. The extrusion rate of the material is controlled at 55Kg per hour, the injection rate of supercritical nitrogen is controlled at 6Kg per hour, the die pressure is 12Mpa, and the die temperature is 185℃, the water temperature of the underwater pelletizer is controlled at 70℃; materials can be continuously added according to the above-mentioned component ratios for continuous production, and the foaming density of the particles obtained is 0.208g / cm 3 .
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