Abstract: A method for preparing a long-chain branched polypropylene includes subjecting a T-reagent to a polymerization reaction with propylene in the presence of a catalyst composition. The catalyst composition includes an alkylaluminoxane and a metallocene-based catalyst. The metallocene-based catalyst contains a metal selected from the group consisting of titanium (Ti), zirconium (Zr), and hafnium (Hf). The T-reagent having an alkenyl silyl functional group is selected from the group consisting of 1,2-bis[dimethyl(vinyl)silyl]ethane, dimethyldivinylsilane, 7-octenyldimethyl(vinyl)silane, 7-octenyldimethyl(allyl)silane, 4-(but-3-enyl)phenyldimethyl(vinyl)silane, 4-(but-3-enyl)phenyldimethyl(allyl)silane, and combinations thereof.

Abstract: The present application relates to a polypropylene with high melt flow index and a method for producing the same, and meltblown fiber fabrics. A reacting mixture is firstly provided, and a polymerization process is performed to the reacting mixture in a slurry reaction system to obtain the polypropylene. The reacting mixture includes propylene monomers, Ziegler-Natta catalysts, organoaluminum compounds and electron donor. The polypropylene has high melt flow index and adjustable melting point and molecular weight distribution, such that it is used to produce the meltblown fiber fabrics.

Abstract: The present disclosure relates to a catalyst composition for polymerizing propylene and a method for producing polypropylene. The catalyst composition for polymerizing the propylene includes a modifying agent. The modifying agent is an ester compound having hydrophilic groups and hydrophobic groups. In the method for producing the polypropylene, a reverse microcellular structure is formed by the modifying agent during a propylene polymerization, in which the hydrophilic groups are inside the reverse microcellular structure, and the hydrophobic groups are outside the reverse microcellular structure, such that polar substances in a raw material are retained inside the reverse microcellular structure. Thus, poisoning of the catalyst is reduced. Besides, the modifying agent can maintain a valence state of titanium in an active site of the catalyst at positive trivalent, such that the propylene polymerization between the titanium and the monomer is facilitated, thereby enhancing an activity of the catalyst.

Abstract: The present application relates to a polypropylene with high melt flow index and a method for producing the same, and meltblown fiber fabrics. A reacting mixture is firstly provided, and a polymerization process is performed to the reacting mixture in a slurry reaction system to obtain the polypropylene. The reacting mixture includes propylene monomers, Ziegler-Natta catalysts, organoaluminum compounds and electron donor. The polypropylene has high melt flow index and adjustable melting point and molecular weight distribution, such that it is used to produce the meltblown fiber fabrics.

Abstract: A polypropylene fabric structure, a manufacturing method thereof, and a protective clothing including the polypropylene fabric structure are provided. The polypropylene fabric structure includes a polypropylene spunbond nonwoven fabric and a polypropylene meltblown nonwoven fabric. The polypropylene meltblown nonwoven fabric is directly bonded to the polypropylene spunbond nonwoven fabric. The polypropylene meltblown nonwoven fabric is made of a material including polypropylene having a melt flow index between 1700 g/10 min and 2000 g/10 min and a melting point between 155° C. and 165° C.

Abstract: The present invention relates to a thermoplastic composition, a thermoplastic composite, and a method for producing the thermoplastic composite. In the method for producing the thermoplastic composite, a polymer, an acid-modified lignin with a specific element content and a compatibilizer with a specific melt flow index and a specific maleic anhydride content are used to produce the thermoplastic composite. Hydroxy groups of the acid-modified lignin react with maleic anhydride groups of the compatibilizer to generate ester bonds via an in-situ reaction catalyzed by acidic groups of the acid-modified lignin to enhance compatibility between the polymer and the lignin, thereby increasing a mechanical strength of the resulted thermoplastic composite.

Abstract: The present application relates to a polypropylene with high melt flow index and a method for producing the same, and meltblown fiber fabrics. A reacting mixture is firstly provided, and a polymerization process is performed to the reacting mixture in a slurry reaction system to obtain the polypropylene. The reacting mixture includes propylene monomers, Ziegler-Natta catalysts, organoaluminum compounds and electron donor. The polypropylene has high melt flow index and adjustable melting point and molecular weight distribution, such that it is used to produce the meltblown fiber fabrics.