The present invention belongs to the field of polypropylene resin and relates to a low VOC content polypropylene resin and its preparation method. The preparation method includes the following steps: pre treat polypropylene with a microwave multi-stage dryer, then dry the pre treated polypropylene in a vacuum oven, and blend and extrude the dried polypropylene and processing aids for granulation; The pretreatment steps of the microwave multi-stage dryer include: first, performing first-order conventional heating at a temperature of 80-150 ℃ for 10-30 minutes; Then perform second-order microwave heating for 1 to 10 minutes, with a microwave power density of 10 to 50 W/L and a material gas-solid ratio of ≥ 3. The total volatile organic compounds (TVOC) and odor of the polypropylene resin of the present invention can be significantly reduced, which effectively solves the shortcomings of the existing technology. The operation process is simple and reliable, and the investment cost is low. It is suitable for high-end automotive interior parts, medical and food packaging materials with high environmental requirements.
Kerke Extrusion Equipment
