Full-degradable mulch film with phosphate fertilizer slow release function, and preparation method thereof
A slow-release phosphate fertilizer and full-degradation technology, which is applied in the field of full-degradable mulch film and its preparation, can solve problems such as poor results, and achieve the effects of improving the utilization rate of phosphate fertilizer, improving the environment, and reducing consumption
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Embodiment 1
[0034] Concrete preparation method comprises the following steps:
[0035] (1) Add 90 parts of polyphosphoric acid to 20 parts by weight of alkali lignin, stir for 60 hours, and dry to obtain phosphated lignin;
[0036] (2) Add 50 parts of PBAT, 20 parts of PLA, 30 parts of phosphorified lignin described in step (1), 0.6 part of tributyl citrate, 0.8 part of bisphenol A, 0.3 part of tert-butyl Hydroquinone, 0.5 parts of epoxidized soybean oil, and 0.2 parts of zinc stearate were mixed for 15 minutes at a speed of 1000 rpm at 105 ° C to obtain a mixed material;
[0037] (3) extruding and granulating the mixed material described in step (2), controlling the temperature at 150-160° C. to obtain phosphated lignin-modified plastic composite particles;
[0038] (4) The composite particles described in the step (3) are blown into a film at 140-150° C. to obtain a fully degradable plastic film with the effect of slow-release phosphate fertilizer.
Embodiment 2
[0040] Concrete preparation method comprises the following steps:
[0041] (1) Add 140 parts of polyphosphoric acid to 40 parts by weight of enzymatic lignin, stir for 80 hours, and dry to obtain phosphorified lignin;
[0042] (2) Add 55 parts of PBAT, 25 parts of PBSA, 20 parts of phosphorified lignin described in step (1), 0.6 part of triacetin, 0.3 part of 1,4-butanediol, 0.4 part of Dibutyl hydroxytoluene, 0.6 parts of maleic anhydride and 0.15 parts of calcium stearate were mixed for 15 minutes at 105° C. at a speed of 1000 rpm to obtain a mixed material;
[0043] (3) extruding and granulating the mixed material described in step (2), controlling the temperature at 140-150° C. to obtain phosphated lignin-modified plastic composite particles;
[0044] (4) The composite particles described in the step (3) are blown into a film at 130-140° C. to obtain a fully degradable plastic film with the effect of slow-release phosphate fertilizer.
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