Method for preparing 1,2-polybutadiene rubber toughened modified polylactic acid
A technology of polybutadiene rubber and polybutadiene, which is applied in the field of rubber toughening modified plastics, can solve problems such as strength decline, and achieve the effects of improving toughness, reducing the magnitude of strength decline, and high motion matching
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[0032] The present invention provides a method for preparing 1,2-polybutadiene rubber toughened and modified polylactic acid. Firstly, 1,2 polybutadiene (E1,2-PB) with different epoxy degrees is prepared, and then E1,2-PB with different epoxide degrees is dissolved in the lactide polymerization system. During the in-situ polymerization of lactide (polylactide (PLA) is formed, the grafting reaction with E1,2-PB occurs at the same time) , To generate PLA-g-E1,2-PB. The specific mechanism is as follows figure 1 As shown, polylactic acid is used as a matrix, PLA-g-E1,2-PB is used as a compatibilizer, and 1,2-PB is used as a toughening agent. Put polylactic acid and PLA-g-E1,2-PB, 1,2-PB in a Hack internal mixer for banburying to obtain 1,2-PB toughened and modified polylactic acid.
[0033] Among them, 1,2 polybutadiene (E1,2-PB) with different epoxy degrees can be prepared by the following method: Place the dried 1,2-PB in a round bottom flask, and add toluene solvent at room temper...
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[0042] Example 1
[0043] Put 0.1g of E1,2-PB with an epoxy degree of 5% and 0.9g of lactide in a test tube, add toluene solvent, and after the E1,2-PB is completely dissolved, add m-cresol-substituted triisobutyl Base aluminum (Fen / Al = 1), tributyl phosphate substituted molybdenum pentachloride catalyst (substance ratio is 3), among which lactide: aluminum catalyst: molybdenum catalyst is based on lactide: aluminum element : The amount ratio of the substance in terms of molybdenum is 1000:30:1, the concentration of lactide is 1mol / L, the reaction is 10h, the polymerization temperature is 100℃, and PLA-g-E1,2-PB5 is obtained (the number 5 represents the ring The degree of oxygen is 5%), and the conversion rate is 62%. Such as figure 2 In order to obtain the infrared spectrum of PLA-g-E1,2-PB5, the results proved that PLA-g-E1,2-PB5 was successfully synthesized.
[0044] Put 1g of E1,2-PB with 5% epoxy degree and 9g of lactide in a test tube, add toluene solvent, after E1,2-PB ...
Example Embodiment
[0045] Example 2
[0046] Put 0.1g of E1,2-PB with 10% epoxy degree and 0.9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add 2-hydroxy-4-methoxy Triisobutyl aluminum (Fen / Al=0.5) substituted with methyl acetophenone, molybdenum pentachloride catalyst substituted with tripropyl phosphate (substance ratio 2.5), of which lactide: aluminum catalyst: molybdenum The catalyst is based on the ratio of lactide: aluminum element: molybdenum element to be 1300:40:1, the concentration of lactide is 0.8mol / L, the reaction is 9h, the polymerization temperature is 90℃, and PLA-g- The conversion rate of E1,2-PB10 was 54%.
[0047] Put 1g of E1,2-PB with 10% epoxy degree and 9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add 2-hydroxy-4-methoxybenzene respectively Ethyl ketone substituted triisobutyl aluminum (Fen / Al=0.5), tripropyl phosphate substituted molybdenum pentachloride catalyst (substance ratio 2.5), o...
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