Single-ingredient polyurethane powder bonding agent synthesized by one-step method and preparation method thereof

The invention relates to a single-ingredient polyurethane powder bonding agent synthesized by a one-step method and a preparation method thereof. The preparation method comprises the following steps of synthesizing polyurethane prepolymers; performing end sealing granulation; performing reduced pressure filtering; washing particles by water for many times; performing vacuum drying at 30 to 40 DEGC to obtain the white polyurethane powder bonding agent. The polyurethane powder bonding agent is white; the particle diameter is 10 to 100 mu m; the softening point is 50 to 75 DEG C; the initial period peeling force is 118.60 to 198.10N. The polarity differences of prepolymers and dispersion liquid are used; the reverse phase suspension polymerization end sealing is performed; the end sealing and the dispersion granulation are integrated; the synthesis, end sealing and granulation are completed in one step. 本发明涉及种步法合成的单组份聚氨酯粉末胶粘剂及其制备方法。所述制备方法包括步骤如下：合成聚氨酯预聚体；封端造粒；减压过滤，用水多次洗涤颗粒，30～40℃真空干燥，得到白色聚氨酯粉末胶粘剂。所述聚氨酯粉末胶粘剂为白色，粒径