Method for producing one-component sealing and coating...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/06 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/66 (2006.01) C08G 18/75 (2006.01) C08K 3/00 (2006.01) C09D 175/04 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2293355

The invention relates a method for producing one- component sealing- and coating compounds with a polyu- rethane base which can cause an improved storage sta- bility of the same and at the same time a reduction of the production costs. The method contains the following steps: - stirring of a mixture out of a polyolcomponent and a diisocyanatecomponent, so an isocyanate prepolymer with a rest content of monomeric di- isocyanate of > 2 weight % is obtained. - dispersing of pigments and inorganic filling material and adding of a solvent while stir- ring, so the rest content of the monomeric di- isocyanate can react with the moisture intro- duced by the filling material and a H2O concen- tration of < 0,01 weight % is obtained in the reaction mixture. - adding of a H2O reactive latent hardener and of at least one catalyst and an air-tight filling of resulting sealing- and coating compound.

L'invention concerne un procédé de production de matières d'étanchéité et de revêtement à un composant à base de polyuréthane, qui permet d'obtenir une meilleure stabilité au stockage desdites matières, tout en réduisant simultanément les frais de production. Ce procédé comprend les étapes suivantes: agiter un mélange comprenant un constituant polyol et un constituant diisocyanate, pour obtenir un prépolymère isocyanate ayant une teneur résiduelle en diisocyanate monomère > 2 % en poids; disperser dans le mélange des pigments et des charges inorganiques et ajouter un solvant en continuant à agiter, la teneur résiduelle en diisocyanate monomère réagissant alors avec l'humidité introduite par l'intermédiaire des charges, la teneur en H2O obtenue dans le mélange réactionnel étant < 0,01 % en poids; ajouter un durcisseur latent réagissant à H2O et éventuellement au moins un catalyseur et conditionner hermétiquement la matière d'étanchéité et de recouvrement obtenue.

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