Preparation method and recyclingmethod for degradable and recyclable paper plastics with water resistance and high-strength

A preparation method for degradable and recyclable paper plastics with water resistance and high-strength, comprising the following steps:

• 1) Stirring and mixing a cyclic carbonate compound with an amine compound uniformly at room temperature to 70° C. to obtain modified materials, wherein the amine compound is at least one of tetraethylenepentamine, polyethyleneimine, polyethylene polyamine or tri (2-aminoethyl) amine;
• and
• 2) Applying the modified materials prepared in step 1) onto paper, and performing curing at 65-130° C. for 0.5-6 hours or curing under 700-6000 W microwave irradiation for 1-15 minutes, without hot pressing, to obtain degradable and recyclable paper plastics with water resistance and high-strength,
• wherein the degradable and recyclable paper plastic is recycled by the following method:
• soaking the degradable and recyclable paper plastic in a sodium hydroxide solution or anhydrous ethanol at a temperature of 70-100° C. for 5-6 hours, degrading non-isocyanate polyurethane in the paper plastic, performing filtration to obtain paper fibers, and performing reshaping by a paper sheet forming machine to produce new paper, wherein molar concentration of sodium hydroxide is 0.8-1.2 mol/L.