Method of manufacturing hydrophilic silicone prepolymer

A method for manufacturing a hydrophilic silicone prepolymer, comprising the steps of:

• performing a ring-opening polymerization, wherein a cyclic siloxane and a cyclic hydrogen siloxane are catalyzed by a strong acid, and then inserted into a hydroxyl-terminated disiloxane, so as to form a hydroxyl-terminated polysiloxane containing multi silicon-hydrogen (Si—H) groups;
• performing a hydrosilation, wherein a carbon-carbon double bond of a hydrophilic monomer is added to the Si—H groups of the polysiloxane by a rhodium-based catalyst, and then the hydrophilic monomer is connected to the polysiloxane to form a hydroxyl-terminated silicone diol containing a hydrophilic side-chain, in which the hydrophilic monomer is an amide-containing hydrophilic monomer or a phosphorylcholine-containing hydrophilic monomer;
• performing a copolymerization, wherein p mole of the silicone diol produced under the hydrosilation is polymerized with q mole of a diisocyanate in a different molar ratio by a catalyst of dibutyltin dilaurate (DBTDL), so as to form a diol copolymer end-capped with hydroxyl groups as p>q or form an isocyanate copolymer end-capped with isocyanate groups as p<q;
• and
• performing a end-capping reaction, wherein the diol copolymer is end-capped with an ethylenically unsaturated monomer containing electrophiles or the isocyanate copolymer is end-capped with an ethylenically unsaturated monomer containing nucleophiles, so as to give the hydrophilic silicone prepolymer end-capped with ethylenically unsaturated groups.