7results about How to "Improve Tangling Effect" patented technology

The invention discloses a preparation method and application of a bifunctional acrylate monomer modified polypropylene coarsening film for an extremely cold-resistant oil-immersed capacitor, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The invention relates to application of a bifunctional acrylate monomer modified polypropylene coarsened film in an extremely cold resistant oil-immersed capacitor or a thin film capacitor. The preparation method comprises the following steps: (1) respectively adding a polypropylene coarsened film, a monomer, an interface agent, a co-monomer, an initiator and deionized water in certain parts by weight into a reactor, and heating for swelling; (2) heating the reaction system to a certain temperature, and carrying out grafting reaction; and (3) washing, extracting and drying. According to the invention, the bifunctional acrylate is used as a monomer to carry out long-chain branching modification on the polypropylene coarsened film, so that the problem of poor performance of a capacitor in an extreme environment caused by low-temperature embrittlement and high-temperature insulation deterioration of the polypropylene coarsened film is solved. The method has the advantages of good effect, environmental protection, simple process, low cost and the like.

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.

The invention relates to the technical field of lithium ion battery components, and particularly discloses a high-temperature-resistant aramid fiber coated lithium ion battery diaphragm and a preparation process thereof. Aramid composite slurry is used for enhancing a base membrane, a liquid crystal phase is locally formed through 3, 5-dimethoxyphenyl, a xanthene structural unit is introduced, nano lignin is added as an auxiliary agent, and the xanthene structural unit and the nano lignin both contain a large number of aromatic ring structures, so that the liquid crystal phase is partially formed; the mechanical strength of the coating can be synergistically enhanced by virtue of a pi-pi stacking effect between aromatic rings and a liquid crystal phase, so that the defect of low tensile strength of a non-woven fabric diaphragm is overcome, and the requirements of high-end products can be fully met.

The invention discloses a preparation method and application of a difurfuryl sulfide long-chain branched modified polypropylene coarsening film for an extremely cold-resistant oil-immersed capacitor, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The difurfuryl sulfide modified polypropylene coarsened film is prepared from a polypropylene coarsened film, difurfuryl sulfide, an interface agent, a co-monomer, deionized water, a main antioxidant, an auxiliary antioxidant and an initiator as raw materials. The difurfuryl sulfide long-chain branched modified polypropylene coarsened film is applied to an oil-immersed capacitor or a thin-film capacitor. According to the invention, the difurfuryl sulfide is used as a monomer to carry out long-chain branching modification on the polypropylene coarsened film, so that the problem of poor performance of a capacitor in an extreme environment caused by low-temperature embrittlement and high-temperature insulation deterioration of the polypropylene coarsened film is solved. The method has the advantages of simple process, environmental protection, low cost, good processing effect and the like.

The invention discloses a preparation method and application of a long-chain branched polypropylene coarsened film for an extremely cold-resistant oil-immersed capacitor, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The method comprises the following steps: adding a polypropylene coarsened film, an acrylate n-alkyl ester monomer, an interface agent, a co-monomer, deionized water, an antioxidant and an initiator into a reactor according to a certain weight ratio, swelling at a certain temperature for a certain time, then reacting at a certain temperature for a certain time, and finally washing and extracting to obtain the polypropylene film. The long-chain branched polypropylene coarsening film for the extremely-cold-resistant oil-immersed capacitor is obtained and is applied to the extremely-cold-resistant oil-immersed capacitor. According to the invention, the acrylic acid n-alkyl ester is used as a monomer to carry out long-chain branching modification on the polypropylene coarsened film, so that the problem of poor performance of a capacitor in an extreme environment caused by low-temperature embrittlement and high-temperature insulation deterioration of the polypropylene coarsened film is solved. The method has the advantages of being good in effect, simple to operate, green, environment-friendly, low in cost and the like.