With the gradual increase of environmental protection requirements

the utilization of highly toxic organic solvents has become the main factor restricting the production and application of polyurethane-based (PU) transparent coatings

and enabling PU alcohol solubility by structural design is an effective strategy for preparing environmentally friendly transparent coatings. In this paper

poly (propylene oxide diol) was used as the soft segments

and the alcohol solubility and transparency of PU coatings were imparted by introducing the alicyclic structure of isophorone diisocyanate into the hard segments. The chemical structure of the alcohol-soluble PU coatings was characterized by Fourier transform infrared spectroscopy

the alcohol-soluble and optical properties were characterized by ultraviolet-visible spectrophotometry

the hydrophobicity was observed by static contact angle test

the thermal stability was determined by thermo-gravimetric analyzer

and the effect of the content of the hard segments on the mechanical properties was analyzed by electronic universal testing machine. Furthermore

the applied properties were investigated by scratch tests and corrosion resistance measurements. The results show that the ring structure with large spatial site resistance makes the hydrogen bonding between urethane groups in the hard segments weak

and the hydrogen bonding between ethanol and urethane groups promotes the solubilization of the PU coatings

which in turn shows favorable alcohol solubility. The amorphous state of the soft and hard segments resulted in good transparency

but with the increase of the hard segments content

the microphase-separated degree of the PUs increased

which resulted in a decrease in the light transmittance of the coatings

a slight decrease in the hydrophobicity

and a significant increase in the tensile strength. The prepared alcohol-soluble PU-based transparent coatings have excellent hydrophobicity

thermal stability

anti-peeling and corrosion resistance

and are expected to be used in optical devices

high-end glass instruments and other applications.