I was shocked to see this new research. Bad news is that acrylic paints are causing 58% of the microplastics pollution in our ocean. Yes, they are plastic. A recent study by Environmental Action, a Swiss-based scientific research firm, shows us that acrylic paint's role in plastic pollution is much greater than most of us realize. The good news is that there are many tried and true alternatives that are healthier and more durable. Consider using mineral, clay, and plant-based alternatives like Romabio, Keim Paints, or Real Milk Paint Co.
https://architizer.com/blog/practice/materials/microplastic-plastic-paint-alternatives/"
The Healthy Materials Lab at Parsons has done a lot of good research: