Modified polylactic acid material under low irradiation dose and preparation method thereof
A polylactic acid material and low-irradiation technology, which is applied in the field of modified polylactic acid material and its preparation, can solve the problems of complex process route and difficulty in obtaining relative molecular weight PLA, and achieve increased molecular weight, improved mechanical properties, and increased radiation stability. Effect
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Embodiment 1
[0026] Polylactic acid (molecular weight: 12,500) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then taken out. Using TAIC as a sensitizer, weigh 1,000g of the above-mentioned polylactic acid and 31g of TAIC and mix them, then The mixture was poured into a reaction kettle, reacted at a reaction temperature of 110° C. for 0.5 hour, and then poured out and cooled.
[0027] The polylactic acid mixture was irradiated with an electron beam at a dose of 25 kGy.
[0028] Using the method in the literature (Xing Yunjie, Yuan Maoquan, Mao Huiping, etc. Preparation of new biodegradable materials-hydrogen-bonded PLLA [J]. Shanghai Chemical Industry, 2006, 31(3): 33-34.) for detection: the obtained polylactic acid material The molecular weight of the product is 180,000; it is tested with reference to the method specified in the GB / T 1040.1-2006 standard: the tensile strength and elongation at break are increased by 53%.
Embodiment 2
[0030] Polylactic acid (molecular weight: 5,000) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then quickly taken out. Using BDDA and HDDA as sensitizers, weigh 2,000g of PLA, 75g of BDDA and 30g of HDDA respectively. After mixing, the mixture is then fed into a reactive twin-screw extruder, and the extrusion temperature is controlled at 110°C. The polylactic acid mixture was irradiated with an electron beam at a dose of 10 kGy.
[0031] Using the method in the literature (Xing Yunjie, Yuan Maoquan, Mao Huiping, etc. Preparation of new biodegradable materials-hydrogen-bonded PLLA [J]. Shanghai Chemical Industry, 2006, 31(3): 33-34.) for detection: the obtained polylactic acid material The molecular weight is 100,000;
[0032] Tested with reference to the method specified in the GB / T 1040.1-2006 standard: the tensile strength and elongation at break have increased by 62%.
Embodiment 3
[0034] Polylactic acid (molecular weight 3,8000) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then quickly taken out. Using ETMPTA as a sensitizer, 2,000g of PLA and 41g of ETMPTA were weighed and mixed, and then The mixture was fed into a reactive twin-screw extruder, and the extrusion temperature was controlled at 140°C. Use in air atmosphere and room temperature 60 The Co-γ-ray source irradiates with a dose rate of 100Gy / min and an absorbed radiation dose of 5kGy.
[0035] The molecular weight of the obtained polylactic acid material is 260,000, and the tensile strength and elongation at break are increased by 50%.
[0036] The detection method is the same as in Example 1.
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