Nano calcium carbonate strengthened microcrystal polypropylene composite material synthesized by supercritical fluid rapid diffusion method

• Main Authors: HAN JIE, MA QINGWEI, GONG KENAN, MA JUNJIE
• Format: Patent
• Language: Chinese; English
• Published: 08.09.2010
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The invention realizes the even distribution of nano calcium carbonate in PP (Polypropylene) by carrying out filling modification on the PP through applying a supercritical CO2 rapid diffusion technology, thereby greatly improving the stability and the mechanical performance of the modified material. The supercritical CO2 plays a role of plasticization on the PP by unique gas-liquid two-phase performance in the production process, the melting temperature of the PP is reduced, and meanwhile, CaCO3 is uniformly distributed in the PP by the high diffusion and permeability of supercritical CO2. The invention researches a high-performance nano CaCO3 filled microcrystal PP powder. The effect of a microcrystal attributes to the sharp diffusion process from a supercritical state to normal temperature and normal pressure of the whole system; a crystal nucleus of the PP is too late to grow due to the sharp performance of conversion; the optical performance and the transparency are greatly improved by great reduction of