Abstract:
Methods of preparing and using compositions and devices comprising compressible absorbent matrix material having mechanically-shaped sponge architecture are disclosed.
Abstract:
La présente invention concerne un procédé de fabrication d'une mousse polyester thermodurcie, comprenant les étapes successives suivantes : (a) mise à disposition d'une composition expansible et thermodurcissable contenant - un composant polyol comprenant au moins un élément choisi parmi le glycérol, le diglycérol et les oligomères de glycérol, - un composant polyacide comprenant de l'acide citrique, - un agent tensioactif, et - un catalyseur d'estérification, (b) introduction de la composition expansible et thermodurcissable dans un moule ou application de la composition expansible sur un support, (c) chauffage de la composition expansible et thermodurcissable à une température au moins égale à 135 °C, de préférence au moins égale à 175 °C, de manière à faire réagir le composant polyol avec le composant polyacide et à former un bloc de mousse polyester thermodurcie.
Abstract:
Methods and combinations of a curing catalyst with a mold release mixture, which is then subsequently applied to the surface of a mold prior to the application of polyurethane reactants to said mold, where the curing catalyst component has the effect of catalyzing the reaction at the surface of the molded part. This catalysis results in greater reactivity at the surface between reacting portions and lower delamination of the surface of the foam, thereby leading to more attractive skins with a more consistent cell structure, and lower de-mold times due to skins whose nature makes them less likely to adhere to the surface of the mold. These foams will be less likely to tear upon opening of the mold, and production quality and output will be improved.
Abstract:
A structural reinforcement for an article including a carrier (10) that includes: (t) a mass of polymeric material (12) having an outer surface; and (ii) at least one fibrous composite Insert (14) or overlay (980) having an outer surface and including at least one elongated fiber arrangement (e.g., having a plurality of ordered fibers). The fibrous Insert (14) or overlay (980) is envisioned to adjoin the mass of the polymeric material in a predetermined location for carrying a predetermined load that Is subjected upon the predetermined location (thereby effectively providing localized reinforcement to that predetermined location). The fibrous insert (14) or overlay (980) and the mass of polymeric material (12) are of compatible materials, structures or both, for allowing the fibrous insert or overlay to be at feast partially joined to the mass of the polymeric material. Disposed upon at least a portion of the carrier (10) may be a mass of activatable material (126). The fibrous insert (14) or overlay (980) may include a polymeric matrix that includes a thermoplastic epoxy.
Abstract:
The invention relates to a method for producing a two-component or multi-component foam for filling cavities or moulding units/bodies with foam. The object of the invention is to provide a method for producing a two-component or multi-component foam for filling cavities or moulding units/bodies with foam and to provide an assembly for carrying out said method, whereby the method and assembly facilitate a low-wear operation, rapid and highly accurate dosage and can also be achieved with few resources and thus cost-effectively. The invention relates to a method for producing a two-component or multi-component foam by applying the mixed components to cavities or moulding units or bodies, each component being supplied to a mixing head (3) from an individual storage container (1). Depending on the operating mode, during operation the components are supplied to the mixing head (3) at an adjustable pressure by means of a dosing element (2), or during circulation said components circulate between at least the storage container (1), the dosing element (2) and the mixing head (3). The specific parameters and settings for the components, the dosing element (2), the mixing head (3) and the storage container (1) are detected and adapted by means of a controller. Each component is dosed by means of at least one electromechanically driven volumetric plunger dosing unit as the dosing element (2) and for the circulation of each component, the component is delivered at least to the dosing element and/or past the dosing element (2). During the circulation the dosing element (2) is set to have a fillable capacity of between 0 % and 30 %, before application the component is delivered to the dosing element (2) in order to fill the latter (2) and for the application the delivery of the component at least to the dosing element (2) is interrupted and the component is delivered to the mixing head by the emptying of the dosing element (2).