Preparation and performance of water dispersion and curing film for polyurethane polyol

Author: 李培礼

Source: 南京理工大学

Oily solvent-type polyurethane contains a large amount of organic volatile solvents, most of which are harmful to the human body, such as toluene, nitrite, DMF, etc.; solvent-free liquid polyurethane contains a certain concentration of free-NCO, which has strong toxicity; In comparison, water-based polyurethane is more friendly, environmentally friendly, safe and non-toxic. 

Water-based polyols need to have good dispersibility, mix evenly with polyisocyanate curing agent components with low shear energy consumption , and ensure that the cured coating film has excellent properties, such as high shear modulus, strong adhesion, etc. performance. In the two-component water-based polyurethane system, polyurethane polyol is a relatively satisfactory polyol component. The proportion of urethane bonds in the molecular chain of polyurethane polyol film can be changed. performance. In this chapter, polyurethane polyol aqueous dispersion was prepared by prepolymer method, and compounded with hydrophilic polyisocyanate curing agent to form a film . The raw material formula was optimized by single factor experiment method, and the effects of W, DMPA dosage, TMP dosage, Rt W and neutralization degree on the performance of HPUA and 2K-WPU coating films were focused on, and the two-component system n-NCo/ The effect of n_OH and curing temperature on the properties of coating film.