12 results about "Melt extrusion" patented technology

The invention relates to a method for preparing a high-temperature resistant microporous membrane. The method sequentially comprises the following steps: (A) mixing raw materials consisting of 20-55% (by weight) of resin mixture and 45-80% (by weight) of membrane forming solvent; (B) carrying out melt extrusion on the mixed raw materials, and cooling to form a sheet; (C) longitudinally and transversely stretching the sheet, so as to form a membrane; (D) extracting the membrane forming solvent from the membrane through an extraction solvent, so as to form a microporous membrane; (E) carrying out heat-setting on the microporous membrane formed in the step (D), wherein the resin mixture consists of the ingredients in percentage by weight: 2-10% of high-temperature resistant resin, 5-15% of polypropylene and 75-93% of polyethylene, the melting point of the high-temperature resistant resin is higher than 170 DEG C, and polyethylene with the molecular weight greater than 106 accounts for 10-30% the total weight of the polyethylene. The method for preparing the high-temperature resistant microporous membrane, disclosed by the invention, aims to provide the high-temperature resistant microporous membrane which is good in temperature resistance and relatively high in melting rupture temperature and better meets the use requirements of lithium battery diaphragms.

The nature of the rotational molding process is cyclic. It requires the temperature of the rotating mold and the plastic it is charged with to be elevated from room temperature to beyond its melting temperature and then cooled back to room temperature. Consequently, rotational molding cycle times are lengthy, which is often considered as the fundamental drawback of this plastic fabrication process. The motivation and objectives of this disclosure are twofold. The presently proposed invention focuses on developing an innovative extrusion-assisted rotational foam molding processing technology for the manufacture of integral-skin cellular composite moldings having adjacent, but clearly distinct, layers of non-cellular and cellular structures, consisting of identical or compatible polymeric grades. Its primary goal is to significantly reduce the processing cycle time in comparison with respective currently implemented technologies by employing melt extrusion in order to maximize the speed of controlled polymer melting.

The invention discloses a scratch-resistant polypropylene material and a preparation method thereof, and relates to the technical field of high polymer materials. The polypropylene composite materialcomprises the following components in parts by weight: 60-75 parts of polypropylene, 20-35 parts of modified chitosan fibers, 10-15 parts of an ore filler, 1-2 parts of a silane coupling agent, 0.5-1part of a lubricant and 3-5 parts of a compatilizer, and the ore filler is formed by mixing diatomite, quartz and calcium carbonate in a weight ratio of 3: 3: 2; the preparation method comprises the following steps: weighing the materials according to the specification, uniformly mixing, adding the obtained mixture into a screw extruder, carrying out melt extrusion, cooling with cooling water after extrusion, and carrying out shearing granulation to obtain the scratch-resistant polypropylene material. The polypropylene prepared in the invention has good scratch resistance.

The invention relates to the field of plastic masterbatch, and discloses a graphene magnetic injection molding masterbatch for nylon electrical appliance plastics, and a preparation method thereof. The preparation process comprises: (1) adding sulfonated graphene, an iron salt and a ferrous salt to deionized water, and carrying out a hydrothermal reaction to obtain graphene-Fe3O4 nanometer composite magnetic micro-particles; (2) carrying out surface treatment on the composite magnetic micro-particles, adding nylon 6 and a dispersant, and carrying out melt extrusion to obtain a nylon 6 melt; and (3) mixing melt, polyamide-amine, adipic acid and hexanediamine, carrying out a condensation polymerization, carrying out pressure relief, drying, and crushing to prepare the graphene magnetic injection molding masterbatch. According to the present invention, the nanometer composite magnetic micro-particles are coated with the hyperbranched nylon 6 with characteristics of good compatibility withthe nylon injection molding matrix and high fluidity, such that the dispersibility of the magnetic powder in the nylon is substantially improved, the melt has good fluidity, the processing performance is excellent, and the method is suitable for popularization and application.

The invention provides a metal texture, scratch-resistant PC/ABS composite material and a preparation method thereof, which comprises 45-65 parts of PC resin, 35-55 parts of ABS resin, 5-10 parts of ASA, and 5-10 parts of compatibilizer , 10-15 parts of metallic pigments, 0.1-0.5 parts of antioxidant, 0.1-0.5 parts of lubricant, after adding into a mixer and mixing uniformly, adding in a twin-screw extruder; Metal texture, scratch-resistant PC/ABS composite material. The metallic texture and scratch-resistant PC/ABS composite material of the present invention is suitable for use in the fields of home appliances, automobiles, and electronic appliances, and plastic parts that require metal texture and no spraying for materials.

The invention relates to the technical field of a high-molecular material, and concretely relates to a polyester film. The polyester film is prepared by 60-80 parts of a polyester material, 20-30 parts of membrane-grade master batch, 2-9 parts of polysiloxane, 4-12 parts of a solvent, 2-4 parts of tritolyl phosphate, 1-3 parts of a curing agent, 1-2 parts of nuciferine, and 2-3 parts of flufenacet. The raw materials are uniformly mixed through a feed mixer, then a mixture is subjected to fusion extrusion through an extruder, the polyester film is prepared through vertical stretching and transverse stretching, and rolling package is carried out finally. Through reasonable designing of the components and a processing technology, the product has good transmittance and has excellent ultraviolet-resistant effect, and the product quality is good.

The invention discloses super-hydrophobic foamed polypropylene and a preparation method thereof.The super-hydrophobic foamed polypropylene comprises polypropylene, reactive long-chain alkylsilane, nano-silica and an additive, the reactive long-chain alkylsilane and polypropylene form a microstructure on the surface of the polypropylene through a grafting reaction, the nano silicon dioxide is embedded in the microstructure, and the grafting rate of the reactive long-chain alkylsilane is 1-30%. According to the super-hydrophobic foamed polypropylene and the preparation method thereof disclosed by the invention, the reactive long-chain alkylsilane and the polypropylene are subjected to grafting reaction during melt extrusion, so that a surface microstructure is formed on the polypropylene, and a super-hydrophobic nano-microstructure is formed on the surface due to embedding of the nano silicon dioxide, so that the super-hydrophobic foamed polypropylene has a super-hydrophobic effect; meanwhile, the melt strength of polypropylene is improved, and the method is more suitable for production of foamed polypropylene.

The invention provides an oil-resistant EVA cable material and a preparation technology thereof. The cable material comprises, by weight, 50-70 parts of a vinylsilane/styrene grafted ethylene-vinyl acetate copolymer (EVA-g-VS/ST), 5-20 parts of polyphenyl ether resin, 15-30 parts of a fire retardant and 1-5 parts of a coupling agent; the VA content of the ethylene-vinyl acetate copolymer is 10-28%, and the vinylsilane/styrene grafted ethylene-vinyl acetate copolymer is prepared through a melt extrusion method under the effect of an initiator. According to the material, the technical problem issolved that the oil resistance of the ethylene-vinyl acetate copolymer with low VA content is low, and meanwhile the obtained cable material has excellent flame retardance and mechanical performance.