Plant proteins as binders in cellulosic paper composites

Area of Science:

• Materials Science
• Biochemistry
• Sustainable Engineering

Background:

• Traditional paper manufacturing often relies on synthetic binders.
• These synthetic binders can pose environmental challenges during production and recycling.
• There is a growing need for sustainable and biodegradable alternatives in the paper industry.

Purpose of the Study:

• To investigate the efficacy of plant proteins as bulk binders for cellulosic fibers in paper composites.
• To evaluate the impact of denatured soy bean protein and wheat gluten on paper properties.
• To compare the performance of plant-based binders with conventional synthetic adhesives.

Main Methods:

• Soy bean protein and wheat gluten were denatured using urea+NaOH and urea+NaOH+acrylamide methods.
• Denatured proteins were incorporated as binders in cellulosic fiber paper composites.
• Paper strength properties, opacity, and kaolin retention were measured and compared.

Main Results:

• Increased amounts of denatured plant proteins significantly enhanced all paper strength properties.
• Soy protein addition resulted in a remarkable improvement in paper opacity.
• Protein binders increased kaolin retention and maintained higher paper strength than protein-free paper.

Conclusions:

• Plant proteins, specifically soy and wheat gluten, are effective biodegradable binders for paper composites.
• These plant-based binders offer a sustainable and environmentally friendly alternative to synthetic adhesives.
• The use of plant proteins simplifies paper recycling processes and reduces environmental impact.