Radiation cure silicone compositions
A technology of radiation curing and composition, which is applied in the field of preparation of this compound, can solve the problems of expensive and difficult to remove by-products in the existing methods of silicone
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[0044] The present invention also provides a process for the preparation of the composition containing the compound of formula (I). One method of preparing compounds of formula (I) comprises the step of mixing: a) a siloxane of formula (II): Compounds of formula (II)b) formula (III): Formula (III) where R 1 , R 2 , R 3 , R 4 , R 5 and n as above. By this method, a silanol of formula (II) is capped with a compound of formula (III) by means of a condensation reaction. Therefore, the invention also relates to compositions comprising the reaction products obtained by this method.
[0045] In the condensation reaction of silanols with silanes bearing hydrolyzable groups, the reactivity of silanes is directly proportional to the number of hydrolyzable groups attached to the silicon, which may be attributed to typical hydrolyzable groups such as alkane The ability of oxygen and acetoxy to withdraw electrons. The more hydrolyzable groups present on the silicon of the silane...
Synthetic example 2
[0054] 150 grams of a silanol fluid having a viscosity of 2000 centipoise was mixed with 3.00 grams of methacryloxymethylmethyldimethoxysilane in a 300 milliliter three-neck round bottom flask. Butyllithium (0.10 mL of a 1.6M solution in hexanes) was introduced via syringe. The mixture was heated at 60°C with vigorous stirring for 2 hours, followed by vacuum stripping at 60°C for 1 hour to remove the methanol by-product.
[0055] The resulting fluid was found to have a viscosity of 6000 centipoise.
[0056] A 40-gram sample of this fluid was mixed with 0.60 grams of diethoxyacetophenone. The mixture was then placed in two glass plates with a gap of 75 mm and irradiated for 1 minute on each side with 70 mW / cm2 of UV light generated by a medium pressure mercury lamp. The formulation cured to a clear rubber with a hardness of 65 as measured by a Shore OO durometer. Synthesis example 3
Synthetic example 3
[0057] 160 grams of a silanol fluid having a viscosity of 5000 centipoise was mixed with 2.04 grams of methacryloxymethylmethyldimethoxysilane in a 300 milliliter three-neck round bottom flask. Butyllithium (0.10 mL of a 1.6M solution in hexanes) was introduced via syringe. The mixture was heated at 60°C for 2 hours with vigorous stirring, followed by vacuum stripping at 60°C for 1 hour.
[0058] The resulting fluid was found to have a viscosity of 16,400 centipoise.
[0059] A 40 g sample of this fluid was mixed with 0.60 g of diethoxyacetophenone. The mixture was then placed in two glass plates with a gap of 75 mm and irradiated for 1 minute on each side with light of 70 mW / cm2 generated by a medium pressure mercury lamp. The formulation cured to a clear rubber with a hardness of 52 as measured by a Shore OO durometer.
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Abstract
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