Preparation and Research of Polyurethane Based Anti-icing Coating Based on Different Young's Modulus
Using 4,4'-diphenylmethane diisocyanate(MDI)and polytetrahydrofuran ether diol(PTMEG)as precursors,a one-component wet-cured polyurethane elastomer(PUE)coating with tunable Young's modulus(0.72-5.95 MPa)was synthesized by manipulating the R value.The effect of Young's modulus of coating on ice adhesion strength was studied by comparing polyether diols with different molecular weights.The results show that higher molecular weight series of polyether diols exhibit lower ice adhesion strength(average 57.71 kPa).As the Young's modulus of the coating increases,the corresponding ice adhesion strength initially rises and then declines.The analysis reveals that the surface of the coating with low Young's modulus(for example,PTMEG-1000 as the soft segment,1.05-2.96 MPa)is easily deformed during water icing expansion,forming uneven structures and providing more adhesion points for the ice structure to adhere,which makes the ice adhesion strength closely related to the surface energy,resulting in the possibility of increasing the ice adhesion strength.However,the decrease interval of ice adhesion strength in coatings with higher Young's modulus(for example,PTMEG-1000 as the soft segment,2.96-5.95 MPa)is not consistent with the positive correlation between Young's modulus and ice adhesion strength.This is due to the effect of low temperature resilience,the elastic mismatch between the ice and the coating induces micro-cracks and cavitation of the ice-coating interface,resulting in the possibility of reducing the ice adhesion strength.Therefore,understanding how coating's Young's modulus affects ice adhesion can be effectively utilized to reduce such adhesive properties.
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