Do you know any glue preparation
Time：2016/10/28 9:37:08 Hits：4785
First of all, we need in the reaction flask, add 60 ml of water, in 80 degrees Celsius conditions, add 6 grams of polyvinyl alcohol, dissolved in 90-95 conditions, dissolved after, cooled to 80-85 degrees Celsius, then add 1-2 drops of hydrochloric acid, regulating PH value is 2, pay attention to, with adjustable PH to note, don't add! Adjusted, adding to the solution of formaldehyde in 1.5 ml, time control in 5 minutes, at about 90 degrees under the conditions of stirring for 15 minutes, this time the theory is milky white, but the experiment is not obvious, so little effect. Then adding sodium hydroxide, regulating PH value between 7 to 8, cooling to room temperature, can be prepared into 107 glue
