Phenyl polysiloxane containing hydrogen and preparation method thereof
A technology of hydrogen polysiloxane and methyl hydrogen cyclosiloxane is applied in the field of phenyl hydrogen polysiloxane and its preparation, which can solve the problems of low viscosity and high viscosity, and achieve the effect of low viscosity characteristics
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Embodiment 1
[0019] i). 75 parts of bis-diphenylmethyl-terminated methylphenyl polysiloxane, 20 parts of methylhydrogencyclotetrasiloxane, 6 parts of tetramethyldihydrodisiloxane, catalyst 3 Parts, added to the reactor, fully stirred and mixed evenly;
[0020] ii). Slowly raise the temperature to 85°C, and stir for 9 hours. After the reaction is completed, cool down and filter out the solid cation exchange resin;
[0021] iii). Distillation under reduced pressure, the temperature was slowly raised to 65° C., the vacuum degree was 750 mmHg, and the time was 0.5 hours. After the reaction is completed, it is cooled and discharged.
[0022] The technical indicators of the phenyl hydrogen-containing polysiloxane prepared by the present invention are as follows:
[0023] Appearance: colorless transparent liquid
[0024] Viscosity (25°C): 95mPa.S
[0025] Refractive index (25°C): 1.5429
[0026] Hydrogen content (%): 0.23%
Embodiment 2
[0028] i). 75 parts of bis-diphenylmethyl-terminated methylphenyl polysiloxane, 30 parts of methylhydrogen cyclotetrasiloxane, 7 parts of tetramethyldihydrodisiloxane, catalyst 3 Parts, added to the reactor, fully stirred and mixed evenly;
[0029] ii). Slowly raise the temperature to 85°C, and stir for 10 hours. After the reaction is completed, cool down and filter out the solid cation exchange resin;
[0030] iii). Distillation under reduced pressure, slowly warming up to a temperature of 70° C., a vacuum degree of 750 mmHg, and a time of 0.5 hours. After the reaction is completed, it is cooled and discharged.
[0031] The technical indicators of the phenyl hydrogen-containing polysiloxane prepared by the present invention are as follows:
[0032] Appearance: colorless transparent liquid
[0033] Viscosity (25°C): 75mPa.S
[0034] Refractive index (25°C): 1.5318
[0035] Hydrogen content (%): 0.37%
Embodiment 3
[0037] i). Add 80 parts of methyl-terminated methylphenylpolysiloxane, 23 parts of methylhydrogencyclopentasiloxane, 7 parts of tetramethyldihydrodisiloxane, and 2 parts of catalyst to the reaction In the container, stir thoroughly to mix evenly;
[0038] ii). The temperature was raised slowly to 85°C, and the reaction was stirred for 12 hours. After the reaction is completed, cool down and filter out the solid cation exchange resin;
[0039] iii). Distill under reduced pressure, slowly raise the temperature to a temperature of 65° C., and a vacuum degree of 730 mmHg for 1 hour. After the reaction is completed, it is cooled and discharged.
[0040] The technical indicators of the phenyl hydrogen-containing polysiloxane prepared by the present invention are as follows:
[0041] Appearance: colorless transparent liquid
[0042] Viscosity (25°C): 116mPa.S
[0043] Refractive index (25°C): 1.5405
[0044] Hydrogen content (%): 0.29%
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