| Waste oil is a general term for inferior oils.It is rich in sources,including the catering industry,the food industry,the edible oil producers,and the leather processing industry.Waste oil is an inedible resource.If it is not handled properly,it will cause serious environmental pollution.If it enters the circulation field directly,it will endanger people's health.Therefore,solving the problem of waste oil treatment,turning it into a waste and reducing environmental pollution is a hot issue that needs to be solved urgently in today's society.At present,waste oil has been reported in biodiesel,surfactants,feed,soil remediation agents,pesticides,coated fertilizers,plasticizers,and resins.However,at present,the preparation process of coated fertilizer is complicated and the cost is high,which restricts the development of coated fertilizer.The preparation of coated fertilizer from waste oil can solve the problems of coated fertilizer to a certain extent,and can also find a new way for waste oil recycling.The yield of soybean waste oil is large,and the degree of unsaturation is high,which makes it easy to be modified.Therefore,this paper uses soybean waste oil as raw material,through epoxidation and ozonation modification,and after appropriate post-treatment,then It is used as a raw material to prepare coated fertilizer.The main research work is as follows:?1?Epoxidized modification of soybean waste oil:taking soybean waste oil as raw material,using cetyltrimethylammonium bromide as phase transfer catalyst and H2O2 as oxygen source in solventless system,the epoxidation reaction of solid phosphotungstic acid catalyzed waste oil was studied.At the same time,the raw oil and product were characterized by FTIR,1H NMR,13C NMR and TG.The results show that when the ratio of H2O2 to waste oil liquid is 1:2 g/ml,m?waste oil?:m?phosphoric acid?:m?cetyltrimethylammonium bromide?=1:0.012:0.008,H2O2 in the 60?system dropwise addition reaction 2 h,the epoxy value can reach a maximum of 4.24%.When the reaction product and the raw material are compared,the carbon-carbon double bond of the waste oil disappears,the epoxy group is generated,and the thermal stability is enhanced,and an epoxidized oil is synthesized.?2?Using phosphoric acid modified epoxy soy waste oil,the epoxy of the product was determined and characterized by FTIR,TG and contact angle.The results showed that the addition of phosphoric acid to epoxidized soybean waste oil increased the hydroxyl value of the oil,decreased the epoxy value,increased the viscosity,enhanced the hydrophobicity,enhanced the thermal stability,and produced phosphate compounds in the system.?3?The soybean waste oil was treated with ozone at room temperature,and the peroxide value and acid value of the product were measured,and the structure and performance of the ozonated waste oil and the raw material waste oil were compared by viscosity,TG,1H NMR,13C NMR and FTIR.The results show that under normal temperature conditions,when the waste oil is treated with ozone,the peroxide value of the oil will increase,the acid value will increase,the viscosity will increase,the thermal stability will decrease,and the hydrophobicity will increase.The system produces1,2,4-trioxolane,aldehydes,and low molecular weight polymers,which are consistent with the Criegee reaction mechanism.The ozonated waste oil was heat-treated,the acid value of the product was tested,and the heat-treated ozonated waste oil was subjected to structural characterization and performance testing by GPC,1H NMR,13C NMR,TG,FTIR and contact angle.The results show that under heat treatment conditions,C=C,oligomers,peroxides and acid values are reduced in ozonated waste oil,and 1,2,4-trioxolane and low molecular weight polymers are decomposed.The polymer in which-C-C-,-C-O-O-C or-C-O-C-is formed as a main chain has an increased molecular weight and dispersion and enhanced hydrophobicity.?4?The coated fertilizer is prepared by using epoxy waste oil,phosphorylated epoxy waste oil,ozonized waste oil and heat-treated ozonized waste oil as raw materials,respectively.The four kinds of coated fertilizers were evaluated by the primary nutrient release rate.The tunable fertilizers were characterized by FTIR and SEM,and the two kinds of coated fertilizers with good effect were tested in the field.The results showed that the coated fertilizer prepared from epoxy waste oil was inferior,and its primary nutrient release rate was 100%.The test of phosphorylated epoxy waste oil showed that the amount of phosphoric acid was 0.1%of the mass of epoxy waste oil,and the obtained coated fertilizer had the best effect,and its primary nutrient release rate was 11.22%.The test of ozonated waste oil showed that under normal temperature conditions,when the peroxide value reached 1046.07 mmol/kg after ozone treatment,the encapsulation fertilizer prepared by the ozonated oil had the best effect,and the primary nutrient release rate was 10.72%;The heat treatment results showed that the optimal heat treatment condition of ozonated waste oil was 120°C for 12 h,and the primary nutrient release rate of coated fertilizer was8.32%.The outer surfaces of the latter three kinds of coated fertilizers are smooth and have no mechanical impurities,which meets the requirements of GB/T 23348-2009"slow release fertilizer"for the appearance of coated fertilizer;the hydrogenation interaction between the membrane layers of the coated fertilizer,phosphorylation Epoxy waste oil-based coating fertilizer has the strongest hydrogen bonding force,followed by heat treatment ozonation waste oil-based coating fertilizer,and ozonized waste oil-based coating fertilizer is the weakest.he film layers of the three kinds of coated fertilizers were observed by SEM to be180200?m,100130?m,180200?m,the surface pores of the coated fertilizer were small,and the sections were closely connected.All of these provide the necessary conditions for the slow release of nutrients from the coated fertilizer.In the field experiment,the corn planting test was carried out on the coated fertilizer prepared by the ozonated waste oil coated film fertilizer and the heat-treated ozonated waste oil with the same quality of urea as the control.It was found that the average yield of ozonized waste oil coated fertilizer,the average yield per area,and the yield per mu increased by 27.16%,27.13%,and 27.11%,respectively,and the heat treatment of ozonated waste oil coated fertilizer increased by 49.63%and 49.54%,and 49.56%. |
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