| 摘要 |
The present invention is directed to a liquid sealant composition based on polysulphide, capable of curing on demand, and the process for preparing same, the liquid sealant composition including: (i) a polysulphide comprising an —SH end group, (ii) a crosslinking agent chosen from ethylenically unsaturated or acetylenically unsaturated compounds, the unsaturated ethylenic or unsaturated acetylenic functions of the crosslinking agent being chemically blocked with a blocking agent, and (iii) optionally, a catalyst. The present invention also relates to a process for coating a substrate with a composition according to the invention, and also to the cured sealant materials formed from this composition. Finally, the invention relates to the use of a liquid sealant composition according to the invention for the construction and/or the maintenance, and more particularly for the adhesive bonding and/or the protection, of vehicles and machines. |
| 主权项 |
1. A method for attaching or adhesively bonding sealing and/or pieces or filling spaces or immediate gaps, said method comprising:
a step of applying to a substrate aliquid sealant composition comprising at least:
(i) a polysulphide with an —SH end group,(ii) a crosslinking agent chosen from ethylenically unsaturated or acetylenically unsaturated compounds, said unsaturated ethylenic or unsaturated acetylenic functions of the crosslinking agent being chemically blocked with a blocking agent, wherein said blocking agent is a diene corresponding to the following formula:in which:
R1, R2, R3, and R4, which may be identical or different, are chosen from H or C1-C12 alkyl chains optionally functionalized with at least one ester, ether, ketone or amide function, —X=CH2, O, S, or N—Rx in which Rx is chosen from linear or branched C1-C30 alkyl chains,
(iii) optionally, a catalysta curing step of the mass of the sealant material by deprotection of the crosslinking agent chemically blocked with a blocking agent, under the effect of external energy, which results in the initiation of the reaction between the polysulphide and the crosslinking agent. |
