Cold-box binding agent systems and mixtures for use as additives for such binding agent systems

摘要

A description is provided of a mixture which is preparable by allowing the reaction of a premixture of (av), methanesulfonic acid (bv), one or more esters of one or more phosphorous-oxygen acids and (cv) one or more silanes. The invention also concerns the use of said mixtures as additives for the polyisocyanate component of a two-component binding agent system for preparation of a polyurethane resin. The invention further concerns a solution containing polyisocyanate for use as a component of a molding material binding agent system, and the use of a solution containing polyisocyanate as the polyisocyanate component of a two-component binding agent system for preparation of a polyurethane resin and corresponding two-component binding agent systems for preparation of a polyurethane resin.

主权项

1. Mixture comprising:
(I) one or more polyisocyanates with in each case two or more isocyanate groups in the molecule, and (II) a premixture prepared by reacting: (av) 1.0-50.0 wt % methanesulfonic acid; (bv) one or more esters of one or more phosphorous-oxygen acids, wherein the total quantity of said esters is in the range 5.0-90.0 wt %, and (cv) one or more silanes, selected from the group consisting of amino silanes, epoxy silanes, mercapto silanes and ureido silanes, wherein the total quantity of said silanes is in the range 5.0-90.0 wt %, wherein the proportion of water is a maximum of 0.1 wt %, wherein the wt % information relates to the total quantity of ingredients (av), (bv), (cv), and water in the premixture.