Preparation of a thermoset resin system suitable for the preparation of fibre reinforced prepreg, the prepreg obtainable from the resin system, and its applications
AssigneePolinvent Kft.
InventorsGábor NAGY, Béla SOMORJAI, László MEISZEL, Ferenc Dávid BALÁZS
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Abstract
The present invention relates to polyisocyanate-based impregnating resin system, which is a liquid polyisocyanate mixture, containing more than 50% by weight MDI based di- and polyisocyanates, and one or more, originally powdery inorganic hydroxides. The resin system of the invention is suitable for the preparation of prepregs. The invention relates also to the prepreg that can be manufactured with the use of the resin system, and use thereof. Among the uses of the invention one important is the use of the prepreg for lining chimneys.
Claims15
Polyisocyanate based impregnating resin system, which is a liquid polyisocyanate mixture, containing more than 50% by weight MDI based di- and polyisocyanates, which polyisocyanates consist of raw P-MDI, polymer P-MDI homologs and isomers, MDI based prepolymers, modified MDIs, and the like, which resin additionally contains one or more, originally powdery inorganic hydroxides at an amount of less than 50% by weight, in suspended form.
Process for chimney lining, characterized that the resin system of the invention is used in the prepreg used for lining, wherein the following steps are used in the process:
- from the prepreg prepared by the use of the resin system suitable size hoses are formed with one of the methods known, and an extruded, one- or multi-layered heat-treatment hose is put inside the prepreg hose, a polyester calibrating hose is pulled to the double-walled hose obtained this way, finally the three-layered hose is introduced into the chimney flue, clamped to the necessary fittings, the prepreg hose is inflated with the heat-treatment hose, and the temperature necessary for curing is provided with the heat-treatment hose mentioned, by blowing through the hose hot steam, mixture of steam and air, or mixture of flue and steam.
Dependencies are inferred from the claim text.