Patent ID: 11912814
Assignee: NANJING TECH UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing a flexible polyurethane foam, comprising the following steps of:
(1) subjecting an epoxidized vegetable oil, a benzoylformic acid, a basic catalyst, and an inert solvent to a ring-opening reaction in a first microchannel reactor of a microchannel reaction device to obtain a vegetable oil polyol;
(2) subjecting the vegetable oil polyol obtained in the step (1), a propylene oxide and the inert solvent to an addition polymerization reaction in a second microchannel reactor of the microchannel reaction device to obtain a vegetable oil polyol for the flexible polyurethane foam, wherein the vegetable oil polyol for the flexible polyurethane foam comprises a hydroxyl value of 31-46 mg KOH/q and viscosity of 648-960 mPas at 25° C.;
(3) using the vegetable oil polyol for the flexible polyurethane foam obtained in the step (2) as a unique polyol, preparing a formulation comprising the following components in parts by weight:
100 parts of the vegetable oil polyol for the flexible polyurethane foam obtained in the step (2); 8 parts of ethylene glycol; 0.5 parts of stabilizer silicone oil B8681; 1 part of water; 1 part of triethylene diamine; and 1.0 part of toluene diisocyanate; wherein preparing the formulation comprises: weighing the above components excluding the toluene diisocyanate by weight first, mixing thoroughly at 25° C., adding the measured toluene diisocyanate, and stirring for 10s, and
(4) pouring the mixture produced in the step (3) into a foaming box for a foaming reaction and curing to obtain the flexible polyurethane foam,
wherein a molar ratio of an epoxy group in the epoxidized vegetable oil in the step (1) to the propylene oxide in the step (2) is 1:(10-20), and
wherein the produced flexible polyurethane foam is having the following properties:
density of 30.2-52.2 kg/m3;
indentation strength (25% IFD) of 85-136 N;
resilience by ball rebound 51-61%;
elongation at break of 115-144%;
tensile strength of 103-121 kPa and
tear strength of 351-412 N/m.