40results about How to "Heterogeneous nucleation" patented technology

The invention provides a secondary aluminum grain refinement process and a secondary aluminum treatment process and relates to the technical field of aluminum alloys. The secondary aluminum grain refinement process comprises the steps of (1) preparing a raw material and putting the raw material into a smelting furnace for smelting; (2) feeding molten aluminum filtered for the first time into a refining furnace through a flow guide chute, introducing inert gases at 1680-1800 DEG C, adding 0.1wt%-0.2wt% of Al-Ti-C refiner, conducting stirring under a vacuum condition, lowering the temperature to 1000-1250 DEG C at the speed of 50 DEG C per minute, adding 0.1wt%-0.2wt% of Al-Ti-C refiner, and then conducting secondary filtering; and (3) putting the molten aluminum into a pig casting machine to conduct ingot bar forming to obtain aluminum alloys. By means of the secondary aluminum grain refinement process, grains can be effectively refined, and the mechanical properties of alloys such as toughness and strength can be improved. The secondary aluminum treatment process including the recycled grain refinement process is easy to operate and friendly to environment and the quality of manufactured finished products is high.

The application belongs to the technical field of materials, and relates to a method for manufacturing nano-copper antibacterial and antiviral melt-blown cloth master batches, comprising the following steps: mixing graphene, nano-copper, microporous silica and nano-microcapsule wrapping materials to obtain Nano-microcapsule-coated graphene composite material; nano-microcapsule-coated graphene composite material and polypropylene material are mixed, melted, extruded and granulated to obtain nano-copper antibacterial and antiviral melt-blown cloth masterbatch. It also relates to the application of the nano-copper antibacterial and antiviral meltblown cloth masterbatch obtained by the above manufacturing method in a meltblown cloth with antibacterial and virus inactivation properties. Using nano-copper as an antibacterial additive to form nano-microcapsule-coated graphene composite material, and forming a melt-blown non-woven fabric masterbatch with polypropylene material, can make nano-copper firmly embedded in the molecular structure of polyester fiber to form a non-dissolving type Antibacterial fibers, so that fibers and nonwovens can obtain continuous antibacterial properties.

The invention provides a battery composite diaphragm, a lithium ion battery and a preparation method thereof. The preparation of the battery composite diaphragm includes: mixing nano inorganic powder with a diluent to obtain a mixed liquid; mixing polyolefin powder with the mixed liquid and performing Mixing and plasticizing to form a homogeneous melt; cooling the homogeneous melt to form a cast film, and stretching the cast film; removing the diluent, and performing shaping and winding treatment to obtain a battery compound diaphragm. In the present invention, nano-scale inorganic powder is added to the polyolefin diaphragm through an in-situ blending method. The nano-inorganic powder has high thermal stability and can reduce the thermal shrinkage of the lithium battery diaphragm after being heated; the nano-inorganic powder has a larger specific The surface area, with polar functional groups on the surface, can improve the lyophilic performance between the polyolefin separator and the electrolyte; the nano-inorganic powder plays a heterogeneous nucleation role in the system, and can increase the crystallization of polyolefin during the polyolefin molding process degree, improving the mechanical strength of the diaphragm.

The invention discloses a polypropylene material with high β crystal form, which adopts 95.8-98.9 parts of polypropylene, 0.2-0.6 parts of β-type nucleating agent, and 0.5-2 parts of (3-aminopropyl) dimethylethoxysilane , 0.2-0.6 parts of heat stabilizer, 0.2-1 part of processing aid are mixed by high mixer and twin-screw extruder extrusion granulation; the preparation method of the present invention is simple and effective, and the crystallinity of the polypropylene material obtained Higher, the relative content of the β crystal form can be increased from 45% of ordinary modification to more than 98%, and the prepared high β crystal form polypropylene material has more excellent mechanical properties, thermal properties and gloss, so that the product of the present invention has Excellent prospects for industrialization.

The invention discloses a heat-resistant and impact-resistant polylactic acid composite material as well as a preparation method and application thereof. The heat-resistant and impact-resistant polylactic acid composite material includes the following components calculated in parts by weight: 60-90 parts of polylactic acid, 5-25 parts of polybutylene terephthalic acid / adipate, 1-25 parts of compatibilizer 5 parts, 1-9 parts of active nano-calcium carbonate and 0.1-1 part of antioxidant; the active nano-calcium carbonate is prepared by modifying nano-calcium carbonate. The preparation method provided by the present invention adopts the technology of first banburying and then blending, so that the prepared heat-resistant and shock-resistant polylactic acid composite material is more uniformly dispersed, and has excellent mechanical properties, impact resistance, heat resistance and complete biological properties. Degradability, it has a good application prospect in the field of heat-resistant packaging such as hot meal containers.

The invention discloses a waste polypropylene regenerated toughening-modified composition and a preparation method thereof, belonging to the technical field of high polymer materials. The waste polypropylene regenerated toughening-modified composition is prepared from the following components in parts by weight: 45-5 parts of toughening master batch, 50-90 parts of waste polypropylene, 2-6 parts of reinforcing assistant R, 1-5 parts of compatilizer, 0.1-0.5 part of lubricant, 0.2-0.6 part of antioxidant and 0-30 parts of polypropylene raw material. The method adopts a two-step process for blending and granulation and comprises the following steps: 1. uniformly mixing a metallocene polyethylene elastomer, an inorganic nano filler, a polypropylene raw material, a lubricant and an antioxidant, melting and granulating to obtain the toughening master batch; and 2. uniformly mixing the toughening master batch, waste polypropylene, reinforcing assistant R, compatilizer, polypropylene raw material, lubricant and antioxidant, melting and granulating. The formed part has the characteristics of high strength, favorable toughness, low production cost and the like.

The invention provides a preparation method of polypyrrole / silver surface modified layered clay-polycaprolactone antibacterial nanocomposite film. + Salt-induced chemical oxidation of pyrrole Py on the surface of layered clay LDHs, the chemical oxidation of newly formed PPy can combine and reduce silver ions into metallic silver nanoparticles AgNP, and then form polypyrrole PPy-coated clay LDHs to obtain polypyrrole surface modification Layered clay antibacterial powder LDHs@PPy‑Ag; finally, LDHs@PPy‑Ag / PCL nanocomposite films were prepared by solution casting of LDHs@PPy‑Ag and polycaprolactone PCL. The invention increases the interface compatibility and bonding force between LDHs and the substrate PCL through the surface organic coating PPy, improves the mechanical properties and gas barrier properties of the final nanocomposite material, and endows the composite film with excellent antibacterial properties, and finally expands the composite film. The application of the material in the field of active packaging has the advantages of simple preparation method and easy control of conditions, and is suitable for large-scale production.

A preparation method of polylactic acid composite material and products. The invention relates to the technical field of polymer materials, and discloses a polylactic acid composite material, which comprises, in parts by weight, 50-90 parts of polylactic acid, 5-25 parts of glass microspheres, 5-25 parts of starch, 1-6 parts of glycerin, 2-5 parts of coloring agent and 1-3 parts of antioxidant. The polylactic acid composite material provided by the invention can remarkably improve heat resistance and mechanical properties. The invention also discloses a preparation method of a polylactic acid composite material product, comprising: S1. adding polylactic acid, starch, glass microspheres and glycerin into a stirring tank, and stirring until uniformly mixed; S2. mixing the product obtained in step S1 Add in the extruder, extrude and granulate; S3. add the product that step S2 obtains in the injection molding machine that the temperature of mould can be adjusted, carry out injection molding, and the temperature of mold increases first and then reduces when holding pressure, to Products are annealed. In the preparation method of the polylactic acid composite product provided by the invention, the product can be annealed in the injection mold.

The invention relates to an anti-yellowing polypropylene plastic and a preparation method thereof, and belongs to the technical field of plastics, the anti-yellowing polypropylene plastic comprises the following raw materials by weight: 80-90 parts of polypropylene, 2-3 parts of modified zinc oxide, 10-12 parts of a flame retardant, 5-6 parts of a compatilizer, 2-3 parts of a filler and 1-3 parts of a lubricant; the preparation method comprises the following steps: mixing the raw materials, extruding by using a double-screw extruder, water-cooling, pelletizing and carrying out injection molding. In order to delay or inhibit the aging process of polypropylene, 2, 2, 6, 6-tetramethylpiperidine-4-alcohol containing a hindered amine structure is selected as a raw material, a modifier containing the hindered amine structure is grafted on the surface of zinc oxide through substitution, addition and other reactions in sequence, the surface polarity of zinc oxide is reduced, the dispersity of zinc oxide in polypropylene is improved, and meanwhile, the aging resistance of polypropylene is improved. The migration of the modifier can be prevented; the anti-yellowing effect is good.