Polyurethaneurea system

摘要

A polyurethaneurea system that includes in some embodiments Parts A and B reaction components for a polyurethaneurea, wherein an exemplary embodiment provides a Part A that comprises between 55 and 75 wt. % of an oligomeric polyol, between 3 and 7 wt. % of an aromatic diamine chain extender, and between 0.1 and 1.5% of a reactivity catalyst; Part B includes between 1 and 15 wt. % of a short aromatic diisocyanate and between 5 and 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol. The polyurethaneurea system may further comprise an elastomer-surface activator comprising a second short aromatic diisocyanate and a second aromatic diisocyanate prepolymer, wherein at least one of the second diisocyanates may be the same as at least one of the diisocyanates of Part B.

主权项

1. A polyurethaneurea system for bonding to a cross-linked rubber surface, wherein reaction components react to form polyurethaneurea, the reaction components comprising:
part A, wherein part A is a mixture comprising:
between about 55 and about 75 wt. % of an oligomeric polyol having an average molecular weight greater than about 1000;between about 3 and 7 wt % of an aromatic diamine chain extender; andbetween about 0.1 and about 1.5 wt. % of a reactivity catalyst; and part B, wherein part B is a mixture comprising:
between about 1 and about 15 wt. % of a short aromatic diisocyanate;between about 5 and about 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol, wherein the mass fraction of each of the reaction components is based upon the total mass of the part A and part B reaction components; and between 0.7 and about 5 wt. % of protectorants;
wherein said protectorants are selected from the group consisting of UV absorbers and light stabilizers, or a combination thereof, andwherein said protectorants may be added to said part A or part B or both; and an elastomer-surface activator adapted for application to the cross-linked rubber surface consisting of a solvent mixed with activators consisting essentially of a second short aromatic diisocyanate and a second aromatic diisocyanate prepolymer.