Synthesis of urea-formaldehyde controlled releasing fertilizer
A technology of controlled release fertilizer and synthesis method, applied in fertilizer mixture, nitrogen fertilizer, fertilization device and other directions, can solve the problems of long slow release period, easy overflow of formaldehyde, poor uniformity, etc., to improve effectiveness, improve environmental quality and production Efficiency, quality improvement effect
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[0026] The preparation process of the urea-formaldehyde controlled-release fertilizer of this example is as follows:
[0027] 1. Weigh 20.0g of flour and add it to a 1000ml beaker, add 240.0g of water, heat to boiling, and keep warm for 5min;
[0028] 2. After stopping heating, 272.0g urea is directly added in the solution of step (1);
[0029] 3. Put the beaker in a constant temperature water bath at 60°C. When the urea is completely dissolved, add 170ml of formaldehyde solution (37%) into the solution at an even speed (add 1.7g of polyacrylamide water-absorbing resin to the 170ml of formaldehyde solution in advance, after completely absorbing use);
[0030] 4. Measure the pH value and adjust the pH of the solution to 8.0 with 10% NaOH, then add 50ml of cottonseed oil to cover the surface of the solution, stir gently and place it in a water bath, when the temperature of the solution rises to 60°C, start timing , keep warm for 40min;
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