A kind of phenol-terminated polysiloxane and its preparation method and a kind of polysiloxane-polycarbonate copolymer
A technology of phenol-terminated polysiloxane and hydrosilane, which is applied in the field of polysiloxane preparation, can solve problems such as increased process complexity, easy yellowing of products, and no mention of platinum content, and achieves product performance without , low catalyst dosage, improved heat resistance and yellowing resistance
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Embodiment 1
[0054] Embodiment 1 Eugenol modified hydrosilane synthesis
[0055] In a 1L three-necked flask, add 163 parts of eugenol (parts by mass, the same below) and Castel (tetramethyldivinyldisiloxane-platinum complex) catalyst (calculated as eugenol and tetramethyl 1 ppm of the total amount of disiloxane), the temperature was raised to 150° C., 134 parts of tetramethyldisiloxane was slowly added dropwise, and the reaction was continued for 1 h after the dropwise addition was completed. After the reaction is completed, use vacuum distillation, 30 theoretical plates, and a reflux ratio of 1:1 to extract the fraction at 163-169 ° C under a pressure of 50 Pa to obtain eugenol-modified hydrosilane (IIa) with a purity of 99.2%.
Embodiment 2
[0056] Example 2 Synthesis of 4-allylphenol modified hydrosilane
[0057] In a 1L three-necked flask, add 134 parts of 4-allylphenol (parts by mass, the same below) and chloroplatinic acid catalyst (calculated as 20ppm of the total amount of 4-allylphenol and tetramethyldisiloxane by platinum) , at 20°C, 670 parts of tetramethyldisiloxane was slowly added dropwise, and the reaction was continued for 10 h after the dropwise addition was completed. After the reaction is completed, use vacuum distillation, 20 theoretical plates, and a reflux ratio of 1:5 to extract the fraction at 156-162°C under a pressure of 60Pa to obtain 4-allylphenol-modified hydrosilane (IIb), with a purity of 99.5%.
Embodiment 3
[0058] Example 3 Synthesis of eugenol-modified hydrosilane
[0059] In a 1L three-necked flask, add 164 parts of eugenol (parts by mass, the same below) and Castel (tetramethyldivinyldisiloxane-platinum complex) catalyst (calculated as eugenol and tetramethyl 5ppm of the total amount of disiloxane), the temperature was raised to 70°C, and 402 parts of tetramethyldisiloxane was slowly added dropwise, and the reaction was continued for 4 hours after the dropwise addition was completed. After the reaction was completed, use vacuum distillation, 25 theoretical plates, reflux ratio 1:3, extract the fraction at 185-191°C under the pressure of 100Pa to obtain eugenol-modified hydrosilane (IIc) with a purity of 99.3%.
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