摘要:
The invention relates to a method for producing molded polyurethane bodies, wherein (a) organic polyisocyanates are mixed with (b) compounds with at least two isocyanate-reactive hydrogen atoms, containing polyester polyol, (c) a propellant, (d) a catalyst, (e) propylene carbonate and compounds selected from the group consisting of at least one compound of the general formula (I) and a compound of the formula (II), and optionally (f) other auxiliary agents and/or additives in order to form a reaction mixture which is introduced into a mold and allowed to react so as to form a molded polyurethane body. The invention further relates to molded polyurethane bodies which can be obtained using such a method and to the use of said molded bodies as steering wheels, seats, armrests, and as shoe soles in particular.
摘要:
The invention relates to a method for producing isocyanurates and isocyanurate-containing polyurethanes, comprising the step of reacting an isocyanate in the presence of a catalyst. Said method is characterized in that the catalyst comprises the product of the reaction of a carboxylic acid containing thiol groups with an alkali-metal, alkaline-earth-metal, scandium-group, or lanthanoid base, wherein the reaction is performed in the absence of compounds containing tin and/or lead, wherein the degree of deprotonation of the catalyst is > 50% to ≤ 100% and the H atoms present in carboxyl groups, the carboxylate groups, the H atoms present in thiol groups, and the thiolate groups are also taken into account in the calculation of the degree of deprotonation. The catalyst is preferably a dipotassium salt of 2-mercaptoacetic acid, 3-mercaptopropionic acid, 4-mercaptobutyric acid, and/or thiosalicylic acid. Even at low temperatures, isocyanurates and/or isocyanurate units and in particular mixtures of isocyanurates and/or isocyanurate units and carbamates and/or urethane units, which are present in isocyanurate-containing polyurethanes (PUR/PIR systems), are obtained at a higher reaction speed than in the case of comparable methods in which catalysts that do not contain mercapto groups, such as potassium acetate, are used.
摘要:
The present invention discloses the production of panels by a discontinuous process. The panels are produced by injecting a polyisocyanurate foam forming composition into the mold cavity at reduced pressure. The combination of certain polyisocyanurate foam forming formulation and the reduced pressure in the mold cavity allows production of and resulting sandwich panels in a discontinuous process where the produced panels are characterized by improved fire resistance.
摘要:
The flame-retardant urethane resin composition contains a polyisocyanate compound, a polyol compound, a trimerization catalyst, a blowing agent, and an additive, wherein the additives include red phosphorus and a filler, and the filler has an aspect ratio of 5 to 50, an average particle diameter of 0.1 µm or larger, but smaller than 15 µm, and a melting point of 750°C or higher.
摘要:
The present invention relates to a polylactic acid resin film which has excellent flexibility, mechanical properties, stability, and transparency while having a specific biodegradability of the polylactic acid resin, and is useful as a packaging material. The present invention provides a polylactic acid resin film, comprising a polylactic acid resin including a hard segment comprising a specific polylactic acid repeating unit, and a soft segment comprising a polyurethane polyol repeating unit in which a specific polyether polyol repeating units are linearly linked via a urethane bond, wherein the total Young's modulus in both machine direction and transverse direction of the film is 350 to 750 kgf/mm 2 , and the total initial tensile strength in both machine direction and transverse direction of the film is 20 kgf/mm 2 or more.
摘要翻译:本发明涉及聚乳酸树脂膜,其具有优异的柔性,机械性能,稳定性和透明性,同时具有聚乳酸树脂的特定生物降解性,并且可用作包装材料。 本发明提供聚乳酸树脂膜,其包含聚乳酸树脂,该聚乳酸树脂包含含有特定聚乳酸重复单元的硬链段和软链段,该软链段包含聚氨酯多元醇重复单元,其中特定聚醚多元醇重复单元通过 氨基甲酸酯键,其中膜的纵向和横向方向上的总杨氏模量为350-750kgf / mm 2,膜的纵向和横向两个方向上的总初始拉伸强度为20kgf / mm 2或 更多。
摘要:
The present invention relates to a method for producing a dielectric polyurethane film from a mixture comprising A) a compound containing isocyanate groups having a content of isocyanate groups of ≥ 10 and ≤ 50 wt.% and a number-average functionality of isocyanate groups of ≥ 2.6 and ≤ 4 and B) a polyester polyol having an OH-number of ≥ 27 and ≤ 120 mg KOH/g, determined in accordance with DIN 53240, characterized in that it exhibits an ester group content of ≥ 1 and ≤ 7 mol/kg and a portion of aromatic structures of ≤ 50 wt.-% The invention also relates to the dielectric polyurethane film obtainable by this method. The invention further relates to a method for preparing an electrochemical transducer and an electrochemical transducer obtainable by said method.
摘要:
The invention relates to a method for producing thermoplastic polyurethane, having the steps of providing a composition Z(W) containing at least one carbodiimide selected from the group consisting of monomer aliphatic carbodiimides, oligomer aliphatic carbodiimides, polymer aliphatic carbodiimides, monomer aromatic carbodiimides, oligomer aromatic carbodiimides, and polymer aromatic carbodiimides, and at least one ester selected from the group consisting of citric acid esters, acetyl citric acid esters, phthalic acid esters, benzoic acid esters, adipic acid esters, hydrogenated phthalic acid esters, and phosphoric acid esters; and subsequently adding the composition Z(W) to a thermoplastic polyurethane or to a reaction mixture in order to produce a thermoplastic polyurethane. The invention further relates to a thermoplastic polyurethane which can be obtained or is obtained using a method according to the invention and to the use of the composition Z(W) as a plasticizer for thermoplastic polyurethanes. The invention also relates to molded bodies containing a thermoplastic polyurethane according to the invention.
摘要:
Methods and combinations for making and using reflective particulate foam comprising flexible cellular foam and a plurality of reflective particulates randomly and/or uniformly dispersed during the production of the reflective particulate foam. Reflective particulates have reflective surfaces which are visually distinguishable as individual reflective particulates without the use of magnification. Reflective particulate foam provides a novel and uniquely distinguishable appearance for use on, under, or within mattresses, pillows, bedding products, medical cushioning foams, outdoor bedding pads, pet beds, outdoor pillows, cushioned display cases, cushioned package containers, and other cushioning products.
摘要:
The invention relates to a process for production of expanded thermoplastic elastomer, said process comprising the steps of: • (a) adding monomers and/or oligomers used for producing the thermoplastic elastomer with or without further starting materials into a first stage of a polymer-processing machine, • (b) mixing the monomers and/or oligomers and also the optionally added further starting materials and reacting the monomers and/or oligomers to give a polymer melt in the first stage of the polymer-processing machine, •(c) passing the polymer melt into a second stage of a polymer-processing machine and adding a physical blowing agent with or without further starting materials to obtain a polymer melt comprising a blowing agent, • (d) molding the polymer melt comprising a blowing agent into an expanded thermoplastic elastomer.