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Improved aging properties of bio-bitumen coating sheets by using modified lignin.
Yanru Ren1, Hui Cao1, Haijun Xu1
1Beijing Bioprocess Key Laboratory, Beijing University of Chemical Technology, Beijing, 100029, PR China.
Journal of Environmental Management
|August 11, 2020
Summary
This study modifies lignin from papermaking waste into bio-bitumen for waterproof coatings. Modified lignin improves aging resistance, offering a sustainable alternative to petroleum resources.
Area of Science:
- Chemical Engineering
- Materials Science
- Environmental Science
Background:
- Papermaking waste liquid (black liquor) causes significant water pollution due to high lignin content.
- Lignin, a recyclable aromatic resource, has low utilization rates (<3%), necessitating effective recycling strategies.
- There is a growing need for biomass-derived materials to replace petroleum resources.
Purpose of the Study:
- To optimize oxypropylation and esterification of lignin.
- To synthesize bio-bitumen from modified lignin.
- To evaluate the performance of bio-bitumen in waterproof coating sheets.
Main Methods:
- Optimized oxypropylation and esterification of lignin.
- Synthesis of bio-bitumen using modified lignin.
- Application of bio-bitumen in waterproof coating sheets.
- Characterization using FTIR and mechanical property testing (softening point, peel strength, low-temperature flexibility).
Main Results:
- Modified lignin addition decreased softening point and peel strength of coating sheets.
- Oxypropylated lignin (OL) and esterified lignin (OEL) significantly improved aging resistance, particularly peel strength.
- Enhanced performance of waterproof coatings after aging compared to control samples.
Conclusions:
- Modified lignin shows promise for creating durable waterproof coatings.
- Lignin valorization offers a sustainable pathway for waste management and material development.
- Bio-bitumen derived from lignin can contribute to reducing reliance on petroleum-based products.
