Preparation method of biodegradable and antibacterial bamboo fiber-based paper straw

A preparation method of a biodegradable and antibacterial bamboo fiber-based paper straw, comprising the following steps:

• step 1, preparing bamboo fiber-based paper;
• step 2, cutting the bamboo fiber-based paper into a rectangular paper sheet;
• wetting the rectangular paper sheet with a citric acid solution at a weight percentage concentration in a range of 10%-15% followed by a chitosan quaternary ammonium salt solution at a concentration in a range of 10-15 grams per liter (g/L) to obtain a wet rectangular paper sheet;
• rolling the wet rectangular paper sheet onto a polytetrafluoroethylene rod, and pressing edges of the wet rectangular paper sheet together, followed by drying at room temperature to obtain a dried paper tube;
• and separating the dried paper tube from the polytetrafluoroethylene rod to obtain a citric acid/chitosan quaternary ammonium salt/bamboo fiber straw;
• and
• step 3, adding a stearic acid at a weight percentage concentration in a range of 10%-22% and a phytic acid at a weight percentage concentration in a range of 5%-20% to a solvent being absolute ethanol and mixing uniformly to obtain a mixture, and heating the mixture to 65-70 degrees Celsius (° C.) under stirring until a clear mixed solution is obtained;
• and immersing the citric acid/chitosan quaternary ammonium salt/bamboo fiber straw obtained in step 2 into the clear mixed solution for 10-20 minutes followed by natural drying at room temperature to obtain the biodegradable and antibacterial bamboo fiber-based paper straw, denoted as a stearic acid/phytic acid/bamboo fiber straw.