2results about How to "Increased melt flow rate" patented technology

This invention provides a method in which the polymerization activity in the first and second polymerization steps is excellent, easily producing propylene-based block copolymers with high melt flow rates and a high proportion of propylene / α-olefin copolymer components. A method for manufacturing a propylene-based block copolymer includes using an olefin polymerization catalyst, performing a first polymerization step, and then performing a second polymerization step. The olefin polymerization catalyst comprises (A) a solid catalyst component for olefin polymerization and (B) an organoaluminum compound. The (A) solid catalyst component for olefin polymerization contains titanium, magnesium, halogen, and a 1,3-diether compound. The first polymerization step is performed at a temperature of 45-65°C, where olefins containing 95-100% by mass of propylene are polymerized to obtain a propylene-based polymer. The second polymerization step is performed at a temperature of 50-90°C, in the presence of the propylene-based polymer, where olefins containing 5% by mass and less than 95% by mass of propylene and α-olefins other than propylene are copolymerized to obtain a propylene / α-olefin copolymer.

The invention belongs to the technical field of high polymer materials, and particularly relates to ABS-PS composite plastic with a high melt flow rate and a preparation method of the ABS-PS composite plastic. The preparation method comprises the following steps: S1, performing surface modification on montmorillonite powder by using chlorinated 1-hexadecyl-3-methylimidazole to obtain ionic liquid modified montmorillonite, and then mixing the ionic liquid modified montmorillonite, ABS resin and SAN resin for melting modification to obtain a modified ABS material; s2, mixing the modified ABS material, the PS material, a compatilizer, a titanate coupling agent and an antioxidant by using a high-speed mixer, and then feeding the mixture into a double-screw extruder for mixing and granulating to obtain the ABS-PS composite plastic with the high melt flow rate. The composite plastic disclosed by the invention has a relatively high melt flow rate and excellent flame retardant property, so that the composite plastic can be better applied to shells of household appliances such as air conditioners and the like.