Patent
Method for manufacturing rigid polyurethane foam, rigid polyurethane foam and impact absorbing material
光彦 渡辺,Mitsuhiko Watanabe +1 more
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TLDR
In this paper, a method for manufacturing rigid polyurethane foam capable of reducing the difference between a density of a skin layer and a core part, and also an impact absorbing material composed of the rigid PU foam was proposed.Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing rigid polyurethane foam capable of reducing a difference between a density of a skin layer and a density of a core part, and also to provide rigid polyurethane foam obtained by the method and an impact absorbing material composed of the rigid polyurethane foam.SOLUTION: A method for manufacturing rigid polyurethane foam includes a step of molding polyurethane foam through foaming and reacting a polyurethane foam formation composition including a polyhydroxy compound, a polyisocyanate compound, a foaming agent, a catalyst and a foam stabilizer. The composition further includes, based on 100 pts.mass of the defoaming agent, 0.1-2.0 pts.mass of the polyhydroxy compound. Rigid polyurethane foam and an impact absorbing material are obtained by the method.read more
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Hard foam thermal insulation material and preparation method thereof
TL;DR: In this article, the authors proposed a hard foam thermal insulation material, which comprises a component A and a component B, wherein the component B is isocyanate, the component A comprises: 100 parts of polyol, 0.57-9 parts of a catalyst, 10-30 parts of fire retardant, 4-12.5 parts of graphite, 2-4 parts of stabilizer, and 6-46 partsof a foaming agent, and the graphite has a specific surface area of 3-70 m /g.
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Patent
Polymer polyol, method for producing the same, and method for producing polyurethane resin
TL;DR: In this article, a polymer polyol (I) is provided that is formed of a polyol, polymer particles (B) obtained by polymerization of an ethylenically unsaturated compound (b), and an active-hydrogen-containing compound (d) having an aromatic ring and having a number-average molecular weight of 150 to 2,000, wherein a content of (b) is 1 to 20% on the basis of a weight of (B).
Patent
Method for producing polyurethane foam
TL;DR: In this paper, a method for producing polyurethane foam with ≥ 0.1 g/cm 3 density of molded articles was proposed, where the polyol component contains one or more polyester polyols selected from a polyesterpolyol A comprising (a) a polypolyol comprising a polyhydric alcohol component containing 2-methyl-1,3-propanediol (hereinafter abbreviated as MPD) and an acid component other than ortho-phthalic acid and terephthalic acids and (b) apolyester polyol
Patent
Method for producing rigid polyurethane foam with open-cell structure
Megumi Sakamoto,惠 坂本 +1 more
TL;DR: In this article, a rigid polyurethane foam with open-cell structure is produced by reacting raw material for polyurethsane foam comprising polyols, polyisocyanates, catalysts, foaming agents and foam breaker, and then foaming and curing.
Patent
Production of impact absorbing molded product
TL;DR: In this article, a polyurethane foamable raw material based on a polyhydroxy compd and a polyisocyanate compd is foamed and reacted in a mold consisting of an upper mold B and a lower mold A to produce an impact absorbing molded product, where a spacer C with a thickness of 2mm or more is arranged between the upper and lower molds B, A and the pack ratio of the core part of the molded product is set to 1.0-1.20 to perform foaming and reaction.
Patent
Manufacture of open-cell rigid foam, open-cell rigid foam obtained thereby and its usage
TL;DR: In this article, a polyisocyante is made to react with a compound containing a plurality of hydrogen atoms capable of reacting with an isocyante such as a hydroxyl group-containing ester represented by the formula having a functionally of 2-8 and a molecular weight of 300-8,000 in the presence of water and, if necessary, an organic compound acting as a physical foaming agent, a catalyst, an auxiliary and an additive to produce an open-cell type rigid foam.