Hyperbranched polyborosiloxane containing functional groups, and preparation method thereof

[0026] 1) Under stirring and nitrogen protection, first add 23.61g γ-glycidoxypropyltrimethoxysilane, 5.60g boric acid, 5.15g deionized water and 0.09g 20% ​​tetramethylammonium hydroxide solution into three mouths After flask, reflux at 30°C for 2 hours;

[0027] 2) Under stirring and nitrogen protection, 30.89g of trimethylchlorosilane, 18.00mL of methanol and 36.00mL of pyridine were added to the solution obtained in step 1). After refluxing at 40°C for 6 hours, reduce Crude product is obtained after pressure distillation;

[0028] 3) Finally, the crude product is dissolved in 1 g of dichloromethane, the insoluble matter is filtered off, and after vacuum distillation and vacuum drying, the hyperbranched polyborosiloxane is obtained.

[0029] The prepared hyperbranched polyborosiloxane has a viscosity of 400mPa·s at 25°C and has the following molecular formula:

[0030] [(CH 3 ) 3 SiO 1 / 2 ] a [R 1 R 2 2 SiO 1 / 2 ] b [R 1 R 2 SiO 2 / 2 ] c [R 1 SiO 3 / 2 ] d

[0031] [R 3 2 BO 1 / 2

[0034] 1) Under stirring conditions, first add 23.61g of γ-glycidoxypropyltrimethoxysilane, 9.41g of trimethyl borate, 3.43g of deionized water and 0.04g of KOH into the three-necked flask, and then keep the temperature at 90°C. Reflux for 30 hours;

[0035] 2) Under stirring conditions, then add a mixed solvent consisting of 15.44g of hexamethyldisiloxane, 5.00mL of n-butanol and 8.30mL of tetrahydrofuran to the solution obtained in step 1), and reflux at 90°C for 20 hours. , The crude product is obtained after vacuum distillation;

[0036] 3) Finally, the crude product is dissolved in 1000 g of dichloromethane, the insoluble matter is filtered off, and after vacuum distillation and vacuum drying, the hyperbranched polyborosiloxane is obtained.

[0037] The prepared hyperbranched polyborosiloxane has a viscosity of 80mPa·s at 25°C and has the following molecular formula:

[0038] [(CH 3 ) 3 SiO 1 / 2 ] a [R 1 R 2 2 SiO 1 / 2 ] b [R 1 R 2 SiO 2 / 2 ] c [R 1 SiO 3 / 2 ] d

[0039] [R 3 2

[0042] 1) Under the conditions of stirring and nitrogen protection, first add 23.80g 3-mercaptopropyltriethoxysilane, 13.00g triethyl borate, 4.46g deionized water and 0.05g p-toluenesulfonic acid into a three-necked flask. Reflux at 65°C for 4 hours;

[0043] 2) Under stirring and nitrogen protection, add a mixed solvent consisting of 23.22g of hexamethyldisiloxane, 20.00mL of ethanol and 10.00mL of pyridine to the solution obtained in step 1), and reflux at 65°C for 7 hours Then, the crude product is obtained after vacuum distillation;

[0044] 3) Finally, the crude product is dissolved in 50 g of toluene, the insoluble matter is filtered off, and after vacuum distillation and vacuum drying, the hyperbranched polyborosiloxane is obtained.

[0045] The prepared hyperbranched polyborosiloxane has a viscosity of 100 mPa·s at 25°C and has the following molecular formula:

[0046] [(CH 3 ) 3 SiO 1 / 2 ] a [R 1 R 2 2 SiO 1 / 2 ] b [R 1 R 2 SiO 2 / 2 ] c [R 1 SiO 3 / 2 ] d

[0047] [R 3 2 BO