A kind of preparation method of alkoxy-terminated polydimethylsiloxane
A technology of hydroxyl-terminated polydimethylsiloxane and dimethylsiloxane, which is applied in the field of preparation of alkoxy-terminated polydimethylsiloxane, and can solve the problem of harsh conditions, long reaction time, sealant Performance changes and other issues, to achieve the effect of easy operation and control, reduce the yield of reactants, and mild reaction conditions
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Embodiment 1
[0029] According to the molar ratio of 1:2.1:5, respectively weigh the hydroxyl-terminated polydimethylsiloxane and methyl orthosilicate (Si(OCH 3 ) 4 ) and dimethylamine, added to the reactor, and reacted at 35°C for 60 minutes; then depressurized to -0.05 MPa and heated to 90°C, and continued to react for 30 minutes; then depressurized to -0.1 MPa and heated to 110°C , and continue the reaction to remove the low boiling for 60 minutes to obtain the product alkoxy-terminated polydimethylsiloxane.
[0030] Detect the prepared alkoxypolydimethylsiloxane: take a certain amount of the product alkoxy-terminated polydimethylsiloxane, add tetrabutyl titanate with a mass content of 1.5%, and pass through the flow The viscosity change of the polydimethylsiloxane before and after the reaction is measured by a variable instrument is less than 10%, indicating that the capping ratio is greater than 85%, which meets the requirements for the preparation of alcohol-type sealant with a long ...
Embodiment 2
[0033] According to the molar ratio of 1: 2.2: 5, respectively weigh the hydroxyl-terminated polydimethylsiloxane and tetraethyl orthosilicate (Si(OC 2 h 5 ) 4 ) and diethylamine, added to the reactor, and reacted at 50°C for 50 minutes; then depressurized to -0.05 MPa and heated to 90°C, and continued to react for 25 minutes; then depressurized to -0.1 MPa and heated to 110°C , and continue the reaction to remove the low boiling point for 75 minutes to obtain the product alkoxy-terminated polydimethylsiloxane.
[0034] Detect the prepared alkoxypolydimethylsiloxane: take a certain amount of the product alkoxy-terminated polydimethylsiloxane, add tetrabutyl titanate with a mass content of 1.5%, and pass through the flow The viscosity change of the polydimethylsiloxane before and after the reaction is measured by a variable instrument is less than 10%, indicating that the capping ratio is greater than 85%, which meets the requirements for the preparation of alcohol-type seala...
Embodiment 3
[0037] According to the molar ratio of 1:2.3:5, respectively weigh the hydroxyl-terminated polydimethylsiloxane and orthophenylsilicate (Si(OC 5 h 6 ) 4 ) and pyrrolidine were added to the reactor, and reacted at 85°C for 30 minutes; then depressurized to -0.05 MPa and heated to 110°C, and continued to react for 15 minutes; then depressurized to -0.1 MPa and heated to 120°C, Continue the reaction to remove the low boiling point for 90 minutes to obtain the product alkoxy-terminated polydimethylsiloxane.
[0038] Detect the prepared alkoxypolydimethylsiloxane: take a certain amount of the product alkoxy-terminated polydimethylsiloxane, add tetrabutyl titanate with a mass content of 1.5%, and pass through the flow The viscosity change of the polydimethylsiloxane before and after the reaction is measured by a variable instrument is less than 10%, indicating that the capping ratio is greater than 85%, which meets the requirements for the preparation of alcohol-type sealant with ...
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