In traditional coating printing processes, petroleum-based raw materials account for over 50% of synthetic resins and additives, exacerbating energy crises and environmental pollution due to high dependence on non-renewable fossil resources. In contrast, bio-based raw materials offer advantages such as environmental friendliness, renewability, and low VOC emissions. Therefore, the work aims to adopt bio-based raw materials to prepare water-based polyurethane (WPU), thus reducing the carbon footprint of the coating printing industry from the source and driving its green transformation. With bio-based poly(trimethylene ether) diol (PO3G 1000), polycarbonate diol (PCDL 2000), and 1,5-pentamethylene diisocyanate (PDI) as primary raw materials and isosorbide (IS) as a chain extender, a series of bio-based WPU emulsions were prepared by the prepolymer dispersion method and tested for properties. As the IS content increased, the thermal stability, mechanical properties, and water contact angle of the cured film significantly improved. When the IS content reached 2.6%, the overall performance was optimal. When the IS content is 2.6%, the water contact angle of the cured film increases from 70° to 80.2°, the maximum thermal decomposition temperature rises from 372.16 ℃ to 402 ℃, and the fabric plate soap wash fastness significantly improves, meeting the application requirements of the coating printing industry. This study provides theoretical support for the application of bio-based waterborne polyurethane in the printing field, contributing to the green transformation and upgrading of the coating printing industry.
Key words
bio-based /
waterborne polyurethane /
coating printing /
isosorbide
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