摘要:
A heat-curable structural adhesive includes a non-rubber-modified epoxy resin, a reaction product of a carboxyl-or amine-terminated butadiene polymer or copolymer and a bisphenol F-based epoxy resin, a elastomeric toughener containing capped isocyanate groups, one or more epoxy curing agents a moisture scavenger and a heat activatable catalyst comprising a mixture of a solid or liquid tertiary amine compound that has a boiling temperature of at least 130° C. and a novolac resin. The structural adhesive develops excellent bonding properties when cured at moderate temperatures, especially from 120 to 170° C., and in addition performs very well in environmental aging stress testing. The adhesive is particularly good for bonding aluminum to another metal, or bonding aluminum to aluminum.
摘要:
Structural adhesives are prepared from an elastomeric toughener that contains urethane and/or urea groups, and have some terminal isocyanate groups that are capped with a phenol and other terminal isocyanate groups that are capped with a hydroxy-functional acrylate or a hydroxy-functional methacrylate. In certain embodiments, the presence of both types of capping on the toughener leads to higher impact peel strengths and a greater level of cohesive failure, than when the toughener is capped with a phenol an hydroxy-functional acrylate or hydroxy-functional methacrylate alone.
摘要:
Epoxy adhesive compositions containing a rubber-modified epoxy resin contain a bisphenol. The bisphenol can be pre-reacted with the rubber-modified epoxy resin to advance the resin. The adhesives are resistant to thermal degradation as can occur in so-called “overbake” conditions, in which the adhesive is heated to high temperatures for prolonged periods of time. In addition, expanded microballoons are included in epoxy structural adhesives to promote a desired fracture mode.
摘要:
The invention relates to a guide-vane arrangement (1) for deviating the flow present in the by-pass flow channel (2) of an engine (3), said arrangement comprising an outer ring (4) and an inner ring (5) and guide vanes (6) arranged therebetween in a substantially radial manner, wherein the outer ring (4) has elements (7) for connecting to an outer engine structure (8), and the inner ring (5) has elements (9) for connecting to an inner engine structure (10), with a plurality of segments (11) being provided. In order to create a guide-vane arrangement (1) which is sufficiently stable and has optimum aerodynamic properties, each segment (11) is integrally produced from at least one guide vane (6) with a part (12) of the outer ring (4) having at least two flanges (14) for fixing to the outer engine structure (8), and with a part (13) of the inner ring (5) having at least two flanges (15) for fixing to the inner engine structure (10), the segments (11) preferably being made of fiber-reinforced plastic composite material, preferably by an RTM (resin transfer molding) method.
摘要:
Two-component epoxy-based structural adhesives are disclosed which exhibit excellent impact resistance, even when cured at approximately room temperature. The adhesives include an epoxy resin component which includes an epoxy resin and a reactive tougher. The adhesives also include a hardener component, which includes from 15 to 50 weight percent of an amine-terminated polyether, from 4 to 40 weight percent of an amine terminated rubber having a glass transition temperature of −40° C. or below, and from 10 to 30 weight percent of an amine-terminated polyamide having a melting temperature of no greater than 50° C.
摘要:
A two-component epoxy adhesive composition comprises a) a first component comprising a first epoxy resin and a second epoxy resin being flexibilized by an elastomer, and b) a second component comprising at least one amine compound with one or more primary and/or secondary amino groups having a molecular weight of less than 450 g/mole. The ratio of the total number of amino groups of the amine compound to the total number of epoxy groups of the epoxy resins is from 0.01:1 to 0.5:1. The mixing of components a) and b) results in a wash-off resistant composition upon heat-curing in a crash-stable structural adhesive.
摘要:
The invention is a composition comprising applying to a substrate a stream of an adhesive comprising: one or more epoxy resins; one or more rubber modified epoxy resins; one or more toughening compositions comprising the reaction product of one or more isocyanate terminated prepolymers and one or more capping compounds having one or more phenolic, benzyl alcohol, aminophenyl, or, benzylamino groups wherein the reaction product is terminated with the capping compounds; one or more curing agents for epoxy resins and one or more catalysts which initiate cure at a temperature of about 100° C. or greater; and optionally; fillers adhesion promoters, wetting agents or rheological additives useful in epoxy adhesive compositions; wherein the adhesive composition has a viscosity at 45° C. of about 20 Pa·s to about 400 Pa.s. The composition can be used as an adhesive and applied as a stream using a high speed streaming process.
摘要:
The present invention provides for a method of impregnating a matrix with a high thermal conductivity filled resin 32, which produces a resin impregnated matrix. The high thermal conductivity material 30 comprises 5-60% by volume of the resin 32. This is compressed by approximately 5-30%, and the distances between the high thermal conductivity materials loaded in the resin are reduced, and the resin is then cured.
摘要:
Improving cell therapy and tissue regeneration in a patient suffering from a cardiovascular or a neurological disease by treating a tissue of the patient with shock waves and/or applying to the patient a therapeutically effective amount of stem cells and/or progenitor cells. Such treatment increases expression of chemoattractants, pro-angiogenic factors, and pro-survival factors. The chemoattractants can be, for example, vascular endothelial growth factor (VEGF) or stromal cell derived factor 1 (SDF-1). For example, the treated tissue can be located in the patient's heart or in a skeletal muscle of the patient, and the shock waves can be extracorporeal shock waves (ESW) or intracorporeal shock waves. The cardiovascular disease can have an ischemic or non-ischemic etiology. For example, the cardiovascular disease can be a myocardial infarction, ischemic cardiomyopathy, or a dilatative cardiomyopathy. For example, the neurological disease can be a peripheral neuropathy or neuropathic pain.
摘要:
Core-shell rubbers are incorporated into epoxy adhesives. The adhesives are structural type adhesives that contain an epoxy resin and a toughener, and may contain a liquid rubber in addition to the core-shell rubber. The adhesives have good modulus and tensile strength, which are obtained without loss of elongation and adhesive properties.