Preparation and Properties Study of Castor Oil-based Polyurethane Film
YIN Hong
QIU Yuzhe
FANG Tao
ZHANG Man
LIU Jiesheng
WANG Yuansheng
TAN Xiaoming
Abstract：To investigate the optimal film-forming conditions and comprehensive performance of castor oil-based polyurethane(CO-PU)films,we used castor oil(CO)and 4,4-diphenylmethane diisocyanate(MDI)as the main reactants,benzoyl peroxide(BPO)as the free radical initiator,and dibutyltin dilaurate(DBTDL)as a catalyst,CO-PU films with different R-values(the ratio of the amount of-NCO to the amount of-OH)were prepared through the pre-polymerisation method while controlling a single variable.The mechanical properties and film-forming state of CO-PU films were investigated to determine the optimal film-forming conditions for CO-PU films,considering different R-values,DBTDL content,and film-forming curing temperature.The experiments demonstrated that the CO-PU films achieved a tensile strength of 36.4 MPa and an elongation at break of 49.05%when the R value was 2.5,DBTDL content was 0.1‰,and the film-forming curing temperature was 80℃.Additionally,the film exhibited a pencil hardness of 6H,a water absorption rate of 0.01%,and a maximum water contact angle of 83.5°,indicating superior all-round performance.This study confirms that the performance of CO-PU films can be improved to a certain extent by changing the film formation conditions of CO-PU films,which lays a foundation for the application expansion of CO-PU films in the later stage and other performance studies.
Keywords：film curing temperaturephysical propertiestensile strengthwater absorptioncontact angle
Publication Date：2024-06-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 164-171 )