Abstract:
Methods for reducing the density of thermoplastic materials and the articles made therefrom having similar or improved mechanical properties to the solid or noncellular material. Also disclosed are improvements to foaming methods and the cellular structures of the foams made therefrom, and methods for altering the impact strength of solid or noncellular thermoplastic materials and the shaping of the materials into useful articles.
Abstract:
A temperature resistant, structural polymer nanocomposite foam may be formed from an amorphous or semi-crystalline, thermoplastic polymer matrix and a nano smectite clay intercalated and/or exfoliated in the polymer. The nano smectite clay may be coated with an organophilic surfactant. A polymer foam may be formed by forming a precursor material from an amorphous or semi-crystalline, thermoplastic polymer. The precursor material may be infused with a supercritical fluid at a process temperature of less than approximately 340° C. and a process pressure of at least 10 MPa. The precursor material may be foamed using the supercritical fluid by suddenly decreasing the pressure on the precursor material. The precursor material may also contain a nano smectite clay. It may be formed into a molded preform. The polymer foam formation process may include net-molding.
Abstract:
Methods for reducing the density of thermoplastic materials and the articles made therefrom having similar or improved mechanical properties to the solid or noncellular material. Also disclosed are improvements to foaming methods and the cellular structures of the foams made therefrom, and methods for altering the impact strength of solid or noncellular thermoplastic materials and the shaping of the materials into useful articles.
Abstract:
A solid state foaming process permits the use of up to 100% recycled pre- and post-consumer polymer for the manufacture of foamed polymer material and thermoformed foamed polymer articles. The process enables the optional formation of integral unfoamed skins of controllable depth and crystallinity on foamed polymeric materails suitable for a wide variety of applications. Because this process does not alter the underlying chemistry of the material all scrap from the manufacturing process may be reused without additive to form new foamed polymeric materials and articles.
Abstract:
Fluoropolymer materials containing tetrafluoroethylene monomers, such as PTFE, are significantly swollen by supercritical carbon dioxide at high temperatures and pressures. The swollen fluoropolymer is processable by molding, extrusion, and other techniques. In addition, the fluoropolymer may be sintered at significantly lower temperatures compared to a nonswollen fluoropolymer material. The melting temperature of fluorinated polymers containing tetrafluoroethylene and triflouroethylene monomers which are swollen with supercritical carbon dioxide is significantly reduced, thereby permitting manufacturing operations such as extruding and molding to be performed at lower temperatures and with reduced risk of decomposition.
Abstract:
A foamed dustproof material which comprises a foamed body, wherein the foamed body has an average cell diameter of from 10 to 90 μm, a load against repulsion upon compressing to 50% of from 0.1 to 3.0 N/cm2, and an apparent density of from 0.01 to 0.10 g/cm3.
Abstract translation:一种泡沫防尘材料,其包括发泡体,其中所述泡沫体的平均泡孔直径为10至90μm,压缩时的反作用力为0.1至3.0N / cm 2的50%,并且表观 密度为0.01〜0.10g / cm 3。
Abstract:
A resin composition containing thermoplastic resin and a flame retardant is sufficiently kneaded and molded and carbon dioxide in a supercritical state is caused to permeate into it. Subsequently, the resin composition is degassed by cooling and/or pressure reduction. As a result of degassing, a resin foam body 1 having a fine and uniform micro-cellular foam structure is obtained. The resin foam body 1 has a cyclic structure in which a resin phase 2 and a pore phase 3 are continuous and intertwined. The obtained resin foam body 1 can suitably find applications such as home OA parts, electric and electronic parts and automobile parts that are required to be highly strong, lightweight and nonflammable.
Abstract:
A method of manufacturing polymeric foam. The invention is related to a method of manufacturing polymeric foam by allowing supercritical fluids to diffuse into polymeric material placed in a mold directly through the mold to impregnate the polymeric material.
Abstract:
Polymeric materials having a plurality of cells formed therein are described. The polymeric materials include a foamed layer comprising a plurality of uniform microcells, nanocells or combinations thereof in a closed cell network, a transition layer positioned adjacent to the foamed layer, and at least one unfoamed outer layer positioned adjacent to the transition layer. The foamed layer may be present in a volume ranging from about 80 to about 99 percent based on the volume of the polymeric material, the transition layer may present in a volume ranging from about 0 to about 10 percent based on the volume of the polymeric material, and the at least one outer layer may be present in a volume ranging from about 0.01 to about 10 percent based on the volume of the polymeric material. Methods of making such polymeric materials are also described, as are apparatus for providing foamed polymeric materials.
Abstract:
The invention relates to expandable olefin bead polymers which comprise a blowing agent with a boiling point of from −5 to 150° C., selected from the group consisting of alkanes, alkanols, ketones, ethers and esters. The particles are unfoamed and have a bulk density above 500 g/l, and can be foamed to a bulk density below 200 g/l after storage for one hour at room temperature in free contact with the atmosphere. They are prepared by impregnating polyolefin pellets in suspension in a pressure vessel with the blowing agent, cooling the batch below 100° C., reducing the pressure and isolating the particles.