Controlled release granular fertiliser
A controlled release, granular fertilizer technology for ammonium salt fertilizers, ammonium nitrate fertilizers, fertilizer mixtures, etc., to solve problems such as not maximizing fertilizer delivery
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Embodiment 1
[0172] Example 1: Synthesis and Composition of Biodegradable Polymers: Synthesis of PCL-PLLA Copolymers
[0173] Granules of PLA were ground and dried at 100° C. for 2 hours under nitrogen itself before use. The ε-caprolactone was dried in an oil bath at a temperature of 100° C. under vacuum pump. Synthesis of copolymers with 15% and 20% by weight of ε-caprolactone were prepared as follows:
[0174] PCL-PLLA polymers were synthesized by ring-opening polymerization using reactive extrusion.
[0175]
[0176] Synthetic scheme of PCL-PLLA polymer
[0177] The actual polymerization time (depending on the amount of catalyst added and the temperature conditions used) varies between two hours and up to two days. It must be noted that the limit to bringing polymerization to an eventual completion is the time required for residual monomer to diffuse through the already formed highly viscous polymer in order to reach the reaction site. Polymers obtained with such processes gene...
Embodiment 2
[0183] Example 2: Synthesis of PCL-PLLA polymer blends by extrusion
[0184] PCL and PLLA blends were prepared by extrusion process using pellets of both PCL and PLLA polymers with different loadings of catalyst BuOSn in amounts of 0.5%, 1%, 1.5%, 2% by weight of the polymers, respectively and 3%. The PCLPLLA polymer was compounded by using a Haake twin-screw extruder at a temperature between 160°C and 190°C. The extruded blend is pelletized into pellets for feeding into the film extrusion process. The PCL / PLA blend was fed into the hopper of the film extrusion process with a temperature profile of 160°C-180°C. Three films were prepared with thicknesses of 120 microns, 160 microns and 200 microns.
Embodiment 3
[0185] Example 3: Hydrolytic Degradation of PCL-PLLA Copolymer
[0186] Membranes prepared in Example 1 with different amounts of catalyst were soaked in water at ambient temperature and showed figure 1 and figure 2 Various degradation profiles are shown.
[0187] figure 1 GPC molecular weight distribution curves for blanks after soaking in water for five weeks are shown. Samples with increased amounts of ε-caprolactone and lower levels of catalyst had higher Mp than those synthesized with higher amounts of catalyst.
[0188] figure 2 The effect of increasing humidity on the degradation of samples and blends in the control chamber is shown.
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