GENIOSIL® SMP 100
GENIOSIL® SMP 100 is a clear, viscous liquid.
GENIOSIL® SMP 100 is a silane-terminated polyester with 3-trimethoxysilylpropylcarbamate end groups. GENIOSIL® SMP 100 reacts with moisture (releasing methanol) to form silanols, which can react further to produce stable siloxane compounds.
GENIOSIL® SMP 100 dissolves readily in standard organic solvents. It is virtually insoluble in aqueous media, and reacts slowly releasing methanol and forming a resinous deposit.
Despite its highly reactive end groups, GENIOSIL® SMP 100 is stable in air for several days in the absence of a catalyst. However, its reactivity toward water and atmospheric humidity must be taken into account during storage and processing, since the material will otherwise undergo slow condensation. Therefore, the material should only be removed from its container in the absence of moisture (e.g. inert gases).
GENIOSIL® SMP 100 can be formulated by conventional methods and mixing procedures. The composition can be varied to produce the required properties in the resultant coating.
Water scavengers are needed to stabilize formulations against premature curing during preparation or due to the presence of moisture during storage. GENIOSIL® XL 63 (trimethoxysilylmethyl-O-methyl-carbamate) and GENIOSIL® XL 10 (vinyltrimethoxysilane) are particularly suitable scavengers.
Suitable catalysts include strongly basic amino compounds (e.g. DBU, DBN) as well as organic and inorganic acids (e.g. phosphoric acid derivatives). Common organometallic compounds can also be used.
Clearcoat Base Formulation:
100 parts GENIOSIL® SMP 100
1 part water scavenger (e.g. GENIOSIL® XL 63)
0.1 parts silicone-based flow enhancer
5 parts catalyst (butylphosphate, 10% in methoxypropylacetate)
1 space line
Solids content and viscosity can optionally be adjusted by using a solvent (e.g. methoxypropylacetate). The formulation can be further adjusted with rheological agents, pigments and other common surface-coating additives.
GENIOSIL® SMP 100 is used as a reactive binder for scratch- and chemical-resistant coatings. Curing takes place in the presence of water or atmospheric moisture.