Preparation and Performance Research of PVA Formaldehyde Absorbent Sponge

By using one-step foaming method,PVA formaldehyde absorbent sponge was prepared,with characterization test of pore size,density,water absorption,water absorption rate,water retention,the structure-activity relationship between the structure and its properties of PVA absorbent sponge was analyzed,thus,the formula of water-absorbing sponge and technological parameters were optimized.The results showed that,using 30 g of PVA solution(PVA particles and water mass ratio=1∶ 7)and 5 mL of formaldehyde as a crosslinking system,while adding 1.5 mL of pentane,5.0 mL of sulfuric acid and 6.0 g of starch inorder to assisting foaming,and putting into 40 ℃ oven to react for 1h after mixing evenly at room temperature,the absorbent performance of the absorbent sponge was the best.The SEM test results showed that the bubble hole connecting with each other with moderate size;the density and water retention rate test showed that sponge had excellent apparent characteristics,hydrophilic,water holding capacity.