| Tung oil is an important forestry biomass resource in China. Developing Tung oil’s downstream products and improving Tung oil’s economic value added are of great realistic significance under the background of increasingly short petroleum resource. The optimal conditions of biodiesel-preparing with Tung oil by transesterification was study, the quality and applied performance of the biodiesel were analyzed. Methyl-α-Eleostearate (ME) was synthesized from Tung oil by transesterification and then, Methyl-α-Eleostearate-Maleic Anhydride Adduct (MEMAA) which was an intermediate for further use was synthesized by resin catalysis method in toluene. Furthermore, Tung Oil Anhydride Ester Polyol (TOAEP), Tung oil-based Bi-dihydrogen-maleimide (TOBBDHMI) and Tung Oil-Polyurethane Prepolymer Bi-dihydrogen-maleimide (TO-PUP-BDHMI) were synthesized from MEMAA and respectively used to modified Polyurethane (PU). PU modified by TOAEP, TOBBDHMI/PU IPN and TO-PUP-BDHMI/PU IPN were prepared, which showed excellent properties. The research results were as follows:1. The optimal conditions for biodiesel-preparing were0.8%NaOH of Tung oil, mole ratio of methanol to oil7:1, reaction time80min and reaction temperature40℃. Under the optimal conditions, the conversion rate was98.2%. The properties of biodiesel completely measured up to the relevant standards. B20-Biodiesel and B50-Biodiesel which were made of the preparing biodiesel were good substitutes for diesel0#.2. DT-851catalytic resin was suitable for the catalysis of methyl-a-eleostearate-maleic anhydride addition reaction, toluene was chosen for reaction media. The appropriate addition conditions were as follows: methyl-α-eleostearate20g, methyl-α-eleostearate and maleic anhydride mole ratio1:1.3; DT-851resin dosage4g; and refluxing for10h. MEMAA’s yield was79.4%(calculated from ME) under the appropriate conditions. DT-851resin catalysis can be used five times and have good use repeatability.3. The optimal conditions of TOAEP synthesis were:p-toluene sufonic acid was used as the catalyst, mole ratio of ethylene glycol to MEMAA was4:1, reaction temperature was120℃~130℃, and reaction duration was8h. Under the optimal synthesis conditions, the yield of TOAEP was up to88.8%with hydroxyl value was up to318.0mg KOH/g (the theoretical value was324.4mg KOH/g). The hardness and tensile strength of the modified PU increased as the dose of TOAEP increased, while the elongation at break decreased. The heat-resistance was improved a lot after modification. The modified PU’s hard segment phase and soft segment phase were compatible well with each other.4. The optimal conditions for TOBBDHMI synthesis were catalyst triethylamine1.0%of MDI, mole ratio of MEMAA to MDI2.4:1, reaction temperature75℃, reaction time2h. Under the optimal conditions, TOBBDHMI’s yield was82.4%(calculated from MDI). The hardness and tensile strength of TOBBDHMI/PU IPN increased as the dose of TOBBDHMI increased, while the elongation at break decreased. The heat-resistance was improved a lot after modification. TOBBDHMI segment phase and PU segment phase were compatible with each other.5. The optimal conditions for TO-PUP-BDHMI synthesis were catalyst triethylamine1.2%of PU-PP, reaction temperature70℃, reaction time2.5h. Under the optimal conditions, the yield of TO-PUP-BDHMI was70.0%(calculated from PU-PP). The hardness and tensile strength of TO-PUP-BDHMI/PU IPN increased as the dose of TO-PUP-BDHMI increased, while the elongation at break increased a little. The heat-resistance was improved a lot after modification. TO-PUP-BDHMI segment phase and PU segment phase were very compatible with each other.Tung oil is used to prepare biodiesel and modify PU. Through the research, the properties of biodiesel completely measured up to the relevant standards, and modified PU showed good mechanical-property and heat-resistance. The study has laid foundation for the greater range of Tung oil’s application. |
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