Starch adhesives, used in the packaging of paper, cartons, and paper bags, are a new type of adhesive developed in recent years.
First, formula
Starch 11-12%, solid caustic soda 0.9-1%, hydrogen peroxide 0.2-0.35, borax 0.4-0.5%, phenol 0.5-0.8%, water 86-87%
Second, the operation
1. Prepare starch paste: fill 80% of the tap water in the container, heat it to 60-65 degrees, then slowly add no impurities and moldy starch to the pot, and keep stirring slowly to avoid Caking or sedimentation occurs during starch dissolution. The stirring operation must be patient and meticulous, otherwise it will affect the product quality.
2. Oxidation and alkalization: When the starch is melted into a paste, hydrogen peroxide is slowly added, and stirring is continued to make the starch fully oxidized. After 10 minutes of hydrogen peroxide addition, a 10% concentration of caustic soda solution diluted with solid caustic soda is added. , Slowly add the reaction pot stirring, heat 1.5-2 hours, and other liquids in the fear of the disappearance of most of the bubbles, cooling to 40-45 degrees, alkalized starch began to thin, more fluid.
Third, thickening: cooling to about 40 degrees, in the state of constant slow stirring, according to the formula amount of phenol added preservatives, after adding 10% concentration of borax solution, in the case of a continuous decrease in temperature, the viscosity gradually increased, into After the paste, stirring was continued for another 30 minutes and the starch binder was successfully produced.
---Chemical Chemical Channel
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