摘要:
A process for producing a polyurethane foam with bimodal cell size distribution, comprising the following steps: providing a mixture in a mixing head, where the mixture comprises: A) a component reactive towards isocyanates; B) a surfactant component; C) a blowing agent component selected from the group consisting of linear, branched or cyclic C1- to C6-alkanes, linear, branched or cyclic C1- to C6-fluoroalkanes, N2, O2, argon and/or CO2, where blowing agent component C) is present in the supercritical or near-critical state; D) a polyisocyanate component; discharging the mixture comprising components A), B), C), and D) from the mixing head where, during the discharge of the mixture, the pressure prevailing in the mixture is lowered to atmospheric pressure.
摘要:
An object of the invention is to provide a polyolefin resin foam which is excellent in flexibility, cushioning property and processability, especially excellent in cutting processability. The present invention relates to a polyolefin resin foam obtained by foaming a polyolefin resin composition using carbon dioxide in a supercritical state, wherein the polyolefin resin composition contains at least: (1) a thermoplastic elastomer composition obtained by subjecting to a dynamically heat treatment a mixture of (A) a rubber, and (B) (B-1) an α-olefin crystalline thermoplastic resin and/or (B-2) an α-olefin amorphous thermoplastic resin, each having a melt tension of less than 3.0 cN at a temperature of 210° C. and at a take-up speed of 2.0 m/min, in the presence of (C) a crosslinking agent; (2) a polyolefin resin; and (3) a nucleant agent having an average particle diameter of from 0.1 μm to less than 2.0 μm. The polyolefin resin foam has a density, for example, of 0.2 g/cm2 or less.
摘要:
To be provided is a foam waterproofing material superior in waterproofness and flexible enough to be compatible with further minute clearance.The foam waterproofing material according to the present invention is a waterproofing material including a foam having a thickness of 0.1 to 1.0 mm, characterized in that the foam has a micro cell structure with an average cell diameter of 10 to 60 μm and an apparent density of 0.01 to 0.050 g/cm3. In the foam waterproofing material, the repulsive load when compressed to 0.1 mm (0.1 mm-compressive repulsion force) of the foam is preferably 0.01 to 0.1 MPa. The foam preferably has a closed-cell structure or a semi-open and semi-closed-cell structure. In addition, the foam may have a pressure-sensitive adhesive layer on one or both faces thereof. The pressure-sensitive adhesive layer is preferably formed on the foam via a film layer.
摘要翻译:要提供的是防水性优异且足够灵活以适应进一步微小间隙的泡沫防水材料。 根据本发明的泡沫防水材料是包括厚度为0.1至1.0mm的泡沫的防水材料,其特征在于,泡沫具有平均泡孔直径为10至60μm的微孔结构,并且表观密度为 0.01〜0.050g / cm 3。 在泡沫防水材料中,当压缩至泡沫的0.1mm(0.1mm压缩斥力)时的排斥载荷优选为0.01〜0.1MPa。 泡沫优选具有闭孔结构或半开放和半闭孔结构。 此外,泡沫体可以在其一面或两面上具有压敏粘合剂层。 压敏粘合剂层优选通过膜层形成在泡沫上。
摘要:
Disclosed is a thermoplastic resin foamed article, wherein the foamed article has two opposite surfaces, wherein the foamed article has at least a skin layer which defines one of the opposite surfaces and has a porosity of 0% or more but less than 1%, a lower-expansion layer which has a porosity of not less than 1% but less than 40% and is arranged so as to be adjacent to the skin layer, and a higher-expansion layer which has a porosity of not less than 40% but less than 100% and is arranged so as to be adjacent to the lower-expansion layer, wherein the skin layer, the lower-expansion layer and the higher-expansion layer are made of the same thermoplastic resin.
摘要:
Disclosed is a thermoplastic resin foam which excels typically in strength, flexibility, cushioning properties, and strain recovery and is especially resistant to cell structure shrinkage caused by the restoring force of resin.The thermoplastic resin foam which is obtained by subjecting a thermoplastic resin composition containing a thermoplastic elastomer and an active-energy-ray-curable resin to foam molding to give a foamed structure, and irradiating the foamed structure with an active energy ray to allow the active-energy-ray-curable resin to form a cross-linked structure in the foamed structure. Also, the thermoplastic resin foam which is obtained by subjecting a thermoplastic resin composition containing a thermoplastic elastomer, an active-energy-ray-curable resin, and a thermal cross-linking agent to foam molding to give a foamed structure, irradiating the foamed structure with an active energy ray to allow the active-energy-ray-curable resin to form a cross-linked structure in the foamed structure, and heating the resulting foamed structure bearing the cross-linked structure to thereby allow the thermal cross-linking agent to form another cross-linked structure in the foamed structure.
摘要:
A composition for a polyolefin resin foam, which comprises a polymer component comprising a polyolefin resin, and at least one of a rubber and a thermoplastic olefin elastomer, and powdery particles, wherein said composition has a melt tension of at least 20 cN when measured in a range between a first temperature at a melting point of said composition and a second temperature that is 20 degrees Celsius higher than said first temperature.
摘要:
A screw type processing device provides a film-formable thermoplastic composition formed mainly of polysaccharide and protein by continuously compressing substances together with carbon dioxide gas to form fluid in a critical state, processes the fluid and is capable of efficiently manufacturing a practicable polyester foam body. A pressure reduction part with increased space volume between screw vanes is formed continuously with an extruding screw of a material supply part by reducing the diameter of the shaft of the screw, and carbon dioxide gas is led into the pressure reduction part. Also, a compression part formed of a screw having a shaft with increased diameter and narrowed vanes is positioned after the pressure reduction part. The diameter of the shaft is made substantially equal to the inner periphery of a barrel, and an orifice part having an orifice formed on the surface or periphery of the shaft is formed. The maximum flow velocity of orifice passing substances is desirably designed to be 10 to 1500 cm/sec.
摘要:
A foam-molded synthetic resin material in which a RBC or CRBC fine powder and bubbles are homogeneously dispersed. There is provided an electrically conductive molded resin material of sufficient porosity by using a fine powder of RB ceramics (RBC) or CRB ceramics (CRBC), in which a surface thereof is not covered with a skin layer while an electrically conductive material is directly bared on the surface, and a method for preparing same and uses thereof.
摘要:
A preparation process of polyimide aerogels that composed of aromatic dianhydrides and aromatic diamines or a combined aromatic and aliphatic diamines is described. Also descried is a process to produce carbon aerogels derived from polyimide aerogel composed of a rigid aromatic diamine and an aromatic dianhydride. Finally, the processes to produce carbon aerogels or xerogel-aerogel hybrid, both of which impregnated with highly dispersed transition metal clusters, and metal carbide aerogels, deriving from the polyimide aerogels composed of a rigid aromatic diamine and an aromatic dianhydride, are described. The polyimide aerogels and the polyimide aerogel derivatives consist of interconnecting mesopores with average pore size at 10 to 30 nm and a mono-dispersed pore size distribution. The gel density could be as low as 0.008 g/cc and accessible surface area as high as 1300 m2/g.
摘要:
A process for modifying an unmodified clay, in particular a montmorillonite type clay, is characterized in that the clay is intimately mixed with an organomodifier selected from quaternary ammonium salts, siliconated ammonium compounds, highly fluorinated ammonium compounds, phosphonium salts, sulphonium salts, precursors of said salts and mixtures of at least two of said compounds, in the presence of carbon dioxide under pressure.