Modified polylactic acid and preparation method thereof
A polylactic acid and modification technology, applied in the field of modified polylactic acid and its preparation, can solve the problems of reduced compatibility and limited toughening effect of PLA.
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[0019] The embodiment of the invention discloses a preparation method of modified polylactic acid, comprising: melt blending polyurethane and polylactic acid at 180°C to 220°C to obtain modified polylactic acid; the polyurethane is polyether diol-propylene Terpolymer of lactide-diisocyanate.
[0020] The present invention uses polyurethane to modify polylactic acid. Since polyurethane is a terpolymer of polyether diol-lactide-diisocyanate, the polyurethane molecular chain contains polyether segments and polylactic acid segments, so polyurethane The compatibility with polylactic acid is greatly improved. During the preparation of polyurethane, linear polyurethane containing terminal hydroxyl groups can be obtained by controlling the amount of diisocyanate used.
[0021] According to the invention, the polyurethane is a terpolymer of polyether diol-lactide-diisocyanate. The preparation method of described polyurethane is specifically:
[0022] Polyether diol and lactide are r...
Embodiment 1
[0035] Drying treatment of polyethylene glycol After strictly drying the three-neck bottle with a ground mouth equipped with a magnetic stirrer and a thermometer, weigh it. Add about 180g of polyethylene glycol-400 (PEG-400) into the three-neck bottle and seal it, leaving only the vacuum interface, stir and heat with a heating mantle with an electromagnetic stirrer, slowly raise the temperature to 130°C, and dehydrate under high vacuum. After no more air bubbles in the solution, dehydrate for 2 hours, then cool to below 90°C, release the vacuum under the protection of nitrogen, weigh, and accurately calculate the mass of PEG-400.
[0036] Polyurethane synthesis Add 10wt% of L-lactide (LA) to the final polyurethane product in a three-neck flask, add 0.1wt% of SnCl to the total amount of the final product 2 , control the reaction temperature at 90-120° C., and react for 12-16 hours under stirring conditions to generate a tri-block prepolymer of HO-PLA-PEG-PLA-OH. Reduce the tem...
Embodiment 2
[0041] The drying treatment of polyethylene glycol is with embodiment 1.
[0042] Synthesis of polyurethane Add 30wt% of L-lactide (LA) to the final polyurethane product in a three-neck flask, add 0.1wt% of SnCl to the final product 2 , control the reaction temperature at 90-120° C., and react for 12-16 hours under stirring conditions to generate a tri-block prepolymer of HO-PLA-PEG-PLA-OH. Reduce the temperature of the prepolymer, and control the temperature of the prepolymer not to exceed 50°C. Add IPDI according to the molar ratio of PEG-400 and isophorone diisocyanate (IPDI) is 100:99.5, and add IPDI into the reactor at one time under stirring condition. Slowly raise the temperature to 70°C and keep the temperature constant for 16h. Then slowly raise the temperature to 120°C and keep the temperature constant for 4 hours to complete the -NCO reaction to obtain the PU product. The whole polymerization process should be protected with nitrogen to prevent the absorption of ...
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