Condensation Curing Silicone Sealant Formulation Guide
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OH Polymer | |
Silane Crosslinkers | |
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Silane Adhesion Promoters | |
Silane Coupling Agents | |
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Fumed Silica | |
Tin Catalysts | |
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Plasticizers | |
Water Scavengers |
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Silane Crosslinkers |
| SiSiB SILANES has been developing and producing crosslinkers and coupling agents for the sealant industry for over 28 years, supplying world markets with a successful range of innovative products. |
| Since in Europe MEKO releasing sealants are under a lot of pressure, more and more customer are looking for low MEKO crosslinkers.
Probably in 2017 MEKO releasing sealants will be banned from the European market for a big part.As a solution, now we are producing Acetoxime & Methyl Isobutyl Ketoxime based crosslinkers, like our PC7131, PC7133, PC7530, PC7531 etc. |
| The crosslinking agent used in RTV silicone systems consists of a species that can be represented as R-Si-X3 (typically used in one component systems) or Si-X4 (typically used in two component systems). The R is an organic group such as a methyl, ethyl, or vinyl, and the X is a moisture hydrolysable group. A simplified cure mechanism for a one-component silicone RTV sealant is shown in below: |
| Figure A: Reaction of crosslinker with polymer ends: |
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| Figure B: Reaction of crosslinker-capped polymer end with moisture: |
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| Figure C: Reaction of resultant polymer end with another polymer: |
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SiSiB® SILANES 2016