1results about How to "Realize separate control" patented technology

This invention relates to the field of polypropylene technology, specifically to a high-strength, creep-resistant, and high-water-pressure-resistant PPH pipe and its preparation method. The pipe is produced by extrusion and two-stage cooling and shaping of a polypropylene homopolymer containing N,N'-dicyclohexyl terephthalamide with a specific particle size, stepwise addition of low-viscosity and high-softening-point maleic anhydride-grafted polypropylene wax, and side-feed addition of highly crystalline non-polar polypropylene wax. This method systematically solves the problems of uneven nucleating agent dispersion, weak interfacial bonding, and coarse processing control in existing technologies through nucleating agent particle size control, hierarchical interface construction, synergistic processing, and gradient cooling. It synergistically and significantly improves the pipe's long-term internal pressure resistance, creep resistance, and resistance to slow crack propagation.