| 摘要 |
An object with a coating comprising: a) covalent bonds formed by reaction of a thiol group and a carbon-carbon double bond, b) covalent bonds formed by reaction of a thiol group and epoxide group, c) covalent bonds formed by a reaction of a carbon-carbon double bond and an epoxide group, said coating comprising a first primer coating and a second coating, said coating comprising covalent bonds between said first and second coatings, said first primer coating comprising covalent cross links between compounds, in the first coating the fraction (r3=ta/tc) of unreacted thiol groups (ta) to thiol groups which have reacted to form a covalent bond (tc) does not exceed 0.11, wherein the half height peak width of tan delta does not exceed 30° C. Advantages of the dual cure composition is that excellent strength is obtained and that the second curing is slow compared to the first initial curing. |
| 主权项 |
1. A method for at least partially coating an object, said method comprising the steps:
a) applying at least partially to said object at least one of—:
i. a compound comprising at least two thiol groups,ii. a compound comprising at least two carbon-carbon double bonds, andiii. a compound comprising at least two epoxide groups, and wherein ratio (r1=t/cc) of the total number of thiol groups (t) in all of the above compounds and the total number of carbon-carbon double bonds (cc) in all of the above compounds is selected from the group consisting of 0.1≦r1≦0.9 and 1.1≦r1≦20, with the proviso that if the ratio r1 is in the interval: 0.1≦r1≦0.9, then at least one homopolymerizing ene-compound is used, wherein ratio (r2=t/e) of the total number of thiol groups (t) in all of the above compounds and the total number of epoxide groups (e) in all of the above compounds is in the range 0.3≦r2≦20, b) initiating a reaction of at least a part of the applied compound comprising at least two thiol groups with at least one of
i. at least a part of the applied compound comprising at least two carbon-carbon double bonds and,ii. at least a part of the applied compound comprising at least two epoxide groups,iii. at least a part of the applied compound comprising at least one carbon-carbon double bond and at least one epoxide group, to obtain an intermediate at least partial coating, wherein said coating comprises at least one compound comprising an unreacted group selected from the group consisting of an unreacted thiol group, and an unreacted epoxide group, c) initiating a reaction of at least a part of said at least one compound comprising an unreacted group, wherein at least one further coating is applied after step b) and before step c), to obtain to a final coated article. |
