Synthesis and use of alkylalkoxy acyloxysilanes and blends thereof for use as a crosslinking agent in moisture curing rtv's
A technology of moisture curing and room temperature vulcanization, which is applied in the field of preparing the crosslinking agent or chain extender and novel RTV sealant composition, and can solve the problems of concentration change and the like
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Embodiment 1
[0051] Example 1 illustrates the preparation of (1-butoxy)methyldiacetoxysilane. The crosslinker is synthesized by mixing the following ingredients under anhydrous conditions.
[0052] 297.2g 1-butanol
[0053] 882.6g Triacetoxysilane
[0054] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure.
Embodiment 2
[0056] Example 2 illustrates the preparation of a mixture of (1-butoxy)methyldiacetoxysilane and methyltriacetoxysilane. The crosslinker was synthesized by mixing the following ingredients under anhydrous conditions. The catalyst mixture is liquid at 20°C.
[0057] 103.4g 1-butanol
[0058] 882.6g methyltriacetoxysilane
[0059] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure.
Embodiment 3
[0061] Example 3 illustrates the preparation of a mixture of methyltriacetoxysilane and butoxymethyldiacetoxysilane. The crosslinker was synthesized by mixing the following ingredients under anhydrous conditions. The catalyst mixture is liquid at 20°C.
[0062] 21.0g n-butanol
[0063] 220.1g Triacetoxysilane
[0064] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure. product of 1 H-NMR and 29 Si NMR with mixtures of methyltriacetoxysilane, (2-propoxy)methyldiacetoxysilane, and bis(2-propoxy)methylacetoxysilane 1 H-NMR and 29 SiNMR agrees.
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