3results about How to "Improve Tangling Effect" patented technology

The invention discloses a polyhydroxyalkanoate composition and a preparation method thereof. The polyhydroxyalkanoate composition comprises the following components in parts by mass: 100 parts of polyhydroxyalkanoate; 0.5 to 5 parts of unsaturated D-polylactic acid; 0.5 to 5 parts of poly (L-lactic acid); the preparation method comprises the following steps: S1, carrying out melt blending on the polyhydroxyalkanoate and the unsaturated D-polylactic acid, and enabling the polyhydroxyalkanoate and the unsaturated D-polylactic acid to fully react, so as to obtain an intermediate product; and S2, carrying out melt blending on the intermediate product obtained in the step S1, poly-L-lactic acid and an ester exchange inhibitor to finally obtain the polyhydroxyalkanoate composition with excellent thermal stability, high melt strength and high crystallization speed.

The invention provides a fiber multilayer composite air filtering material and a preparation method thereof. The fiber multilayer composite air filtering material comprises a fiber base material, a metal catalyst is loaded on the fiber base material, the surface of the fiber base material is covered with a nanofiber membrane, the fiber base material is composed of alkali-treated bamboo fibers and polymer fibers, and the nanofiber membrane contains an antibacterial agent and a silane coupling agent. The fiber multilayer composite air filtering material has the advantages of high catalyst loading capacity, excellent filtering efficiency, good mechanical strength and toughness and the like, the raw materials are wide in source, the process is simple and environment-friendly, and a new way is provided for development of multifunctional air filtering materials. The invention also provides a preparation method of the fiber multilayer composite air filtering material.

The application belongs to the technical field of polyethylene, and particularly relates to single-kettle bimodal polyethylene for water supply pipes and a preparation method thereof. The single-kettle bimodal polyethylene for water supply pipes is prepared by using ethylene as raw material, hydrogen as molecular weight regulator, a main catalyst and a cocatalyst, and a gas phase fluidized bed process to perform copolymerization with 1-hexene in a single reactor. The main catalyst is a supported metallocene bimetallic catalyst which is prepared by loading bis(cyclopentadienyl)zirconium dichloride, dichlorotitanocene and bis-arene imidazole pyridine iron complex on a silica carrier. The length of tie molecules and the lamella thickness are increased by increasing the polyethylene molecular weight. Meanwhile, the content of the comonomer in the polyethylene molecular chain is increased, which further increases the entanglement effect of the tie molecules between the lamellas, so that the lamellas are not easy to slip, thereby improving the slow crack growth resistance of the material.