4results about How to "Uniform cell structure" patented technology

The invention provides a composite insulating layer of a light superconducting cable and a preparation method and application of the composite insulating layer. The composite insulating layer is prepared from the following raw materials in parts by weight: 40-60 parts of fusible polytetrafluoroethylene, 30-50 parts of fluorinated ethylene propylene, 0.5-5 parts of an auxiliary agent, 1-5 parts of filler and 0.1-0.6 part of a nucleating agent. The composite insulating layer of the light superconducting cable has relatively high tensile strength, relatively low dielectric constant and dielectric loss factor, good mechanical property and high insulating strength; compared with the prior art, the composite insulation layer has the advantages of low average cell diameter and high cell density, which indicates that a uniform and fine cell structure is formed in the composite insulation layer, the overall density of the material can be effectively reduced, the insulation layer is light, and the composite insulation layer can be applied to preparation of light superconducting cables for medical equipment and realizes integrity and low loss of high-frequency signal transmission.

The present application relates to a kind of flame-retardant anti-shrinkage PBAT / bamboo powder supercritical foaming material and its preparation method, belong to degradable foaming material technical field.To solve the problem that PBAT system introduces bamboo powder and flame retardant causes foaming material cell structure uneven, density uneven, mechanical property drops, the present application provides a kind of flame-retardant anti-shrinkage PBAT / bamboo powder supercritical foaming material, component includes PBAT, bamboo powder and flame retardant, melt extrusion granulation after being placed in airtight container, fills in supercritical gas and is foamed to be prepared.The present application improves the anti-shrinkage and flame-retardant performance of PBAT foaming material by the addition of bamboo powder and flame retardant;By optimizing the injection amount of supercritical gas, foaming temperature and pressure, reduce foaming instability, effectively offset the adverse effects of bamboo powder and flame retardant on cell growth, obtain uniform cell structure and density, further improve the mechanical property of material.

The application relates to the field of high polymer foaming materials, and particularly discloses a preparation method of elastic polypropylene composite foaming beads, the foaming beads and a molded product thereof, and the preparation method of the elastic polypropylene composite foaming beads comprises the following steps: uniformly mixing polypropylene resin, alpha-olefin elastomer and an additive, melt plasticizing, the ratio of the melt mass flow rate of the polypropylene resin to that of the alpha-olefin elastomer being 1:1-3, to obtain a composite; injecting a supercritical fluid, the supercritical fluid accounting for 0.5-3.0 wt% of the total mass of the composite, mixing and melting to obtain a mixed melt; gradiently cooling the mixed melt, then extruding, cutting and drying, then adding a dispersion medium and a foaming agent, impregnating through pressurization and heating, then releasing pressure to foam, washing, drying and curing, to obtain the foaming beads; the molded product is obtained by water vapor heating molding of the foaming beads; and the foaming beads have the advantages of good compatibility and dispersibility, good heat resistance, high expansion ratio, high elasticity and dimensional stability.

This application relates to the field of building insulation materials technology, specifically disclosing a method for preparing vitrified microcapsule insulation mortar based on phase change microcapsules. The method includes the following steps: dry mixing ZrO2 / ZnO / PDA multi-shell phase change microcapsules, phenolic resin foam-vitrified microsphere composite material, cement, cellulose ether, fly ash, polypropylene fiber, water-reducing agent, and redispersible latex powder for 25-30 seconds to obtain a preliminary mixture; adding water to the preliminary mixture and stirring for 60-90 seconds until homogeneous to obtain the vitrified microcapsule insulation mortar based on phase change microcapsules. The insulation mortar provided by this application exhibits excellent insulation performance and temperature regulation and energy storage capacity.