Urea aldehyde group biodegradable polymer sand-fixing material with nutrient controlled release and water absorption and retention functions
A polymer material and biodegradation technology, applied in the field of biodegradable polymer materials, can solve the problems of barrenness, poor water and fertilizer retention capacity, unfavorable plant growth, etc., and achieve the effects of simple process, excellent mechanical properties, and good water and fertilizer environment.
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[0051] A water-absorbing and water-retaining polymer material is corn straw (CS) modified polyacrylic acid (PAA CS ), the inorganic fertilizer is potassium dihydrogen phosphate (KH 2 PO 4 ) and the biodegradable polymer material fabric select the preparation method of the urea aldehyde-based biodegradable sand-fixing material with both slow and controlled release of nutrients and water absorption and water retention functions of polylactic acid (PLA) fabric, comprising the following steps:
[0052] (1) Preparation of methylol urea (MU) solution: add formaldehyde and urea to a closed reaction vessel, the molar ratio of the two is 1:2, then adjust the pH of the solution to 8, and react at 40°C for 2h to obtain MU solution.
[0053] (2) Use KOH to adjust the neutralization degree of acrylic acid AA to 80%, and then sequentially mix the AA solution with a neutralization degree of 80%, pretreated CS, and KH 2 PO 4 and ammonium persulfate are added to the MU solution prepared in...
Embodiment 1
[0058] Obtain the present invention by being coated with PAA CS / KH 2 PO 4 UF-1.5 PLA fabric is a urea aldehyde-based biodegradable polymer sand-fixing material with the functions of sustained and controlled release of nutrients and water absorption and water retention. The tensile strength is 2.42MPa, the water absorption rate is 21.67g / g, and the nutrient element nitrogen Content 6.55wt%, with P 2 o 5 The content of nutrient element P is 0.61wt%, expressed as K 2 The content of nutritional element K calculated as O is 24.97wt%.
Embodiment 2
[0060] Obtain the present invention by being coated with PAA CS / KH 2 PO 4 The urea aldehyde-based biodegradable polymer sand-fixing material prepared by PLA fabric of UF-1 has the functions of slow and controlled release of nutrients and water absorption and water retention. The tensile strength is 2.66MPa, the water absorption rate is 41.59g / g, and the nutrient element nitrogen Content 11.03wt%, with P 2 o 5 The content of nutrient element P is 1.03wt%, expressed as K 2 The content of nutritional element K calculated as O is 21.37wt%.
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