Organosilicon leather coating technology based on carbon peak strategy

Based on the demand of carbon peak and carbon emission reduction strategy, divinyl-terminated polydimethylsiloxane (^ViPDMS^Vi), poly(methylhydrosiloxane) (PMHS), divinyl-terminated polymethylvinylsiloxane (^ViPMVS^Vi), and fumed silica were used as primary raw materials, polydimethylsiloxane (PDMS) synthetic leather coating was in situ constructed by thermally induced hydrosilylation polymerization on the synthetic leather substrate. The effect of the viscosity of ^ViPDMS^Vi, the active hydrogen content of PMHS, the molar ratio of vinyl groups to active hydrogen, the dosage of ^ViPMVS^Vi and fumed silica on the performance of PDMS polymer coating, including mechanical properties, cold resistance, flexural resistance, abrasion resistance, hydrophobic and anti-fouling properties were investigated. The results show that ^ViPDMS^Vi with high vinyl content and PMHS with low active hydrogen content is more conducive to obtaining organosilicon coating with better mechanical properties, the optimized dosage of ^ViPMVS^Vi and fumed silica was 7 wt% and 40 wt%, respectively. In this case, the tensile strength and the broken elongation of the PDMS polymer coating reached 5.96 MPa and 481%, showing reasonable mechanical properties for leather coating. Compared with polyurethane based or polyvinyl chloride based synthetic leather, the silicon based synthetic leather prepared by this method exhibits excellent cold resistance, abrasion resistance, super hydrophobicity, and anti-fouling characteristics.

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