A kind of high melt strength polylactic acid material and preparation method thereof
A polylactic acid material and high melt strength technology, which is applied in the field of fully biodegradable polymer materials, can solve the problems of restricting the large-scale production of polylactic acid materials, complex processing technology, harsh production conditions, etc., and achieves high production efficiency and simple process. , Improve the effect of melt strength
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Embodiment 1
[0022] Weigh 493g of polylactic acid, 5g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, processing aid BHT (hindered phenolic antioxidant 2,8-di-tert-butyl-4-methyl Phenol) 0.5g, acetone 10g, 1,6-hexanediol diacrylate and dicumyl peroxide are fully dissolved in acetone first, then poured into polylactic acid, fully mixed in a mixer, until the acetone volatilizes Completely, the grafted polylactic acid product is obtained through a twin-screw extruder melt grafting reaction. The temperature of the twin-screw extruder is 160~180°C, the screw speed is 50r / min, the melt flow rate of the grafted product is 1.2g / 10min, and the melt strength is 6.8×10 4 Pa·s.
Embodiment 2
[0024] Weigh 488g of polylactic acid, 10g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, 0.5g of processing aid TH-168 (phosphite antioxidant), 10g of acetone, and mix 1, 6-Hexanediol diacrylate and dicumyl peroxide are fully dissolved in acetone, then poured into polylactic acid, mixed fully in a mixer, until the acetone is completely volatilized, melted and grafted through a twin-screw extruder The reaction results in grafted polylactic acid products. The temperature of the twin-screw extruder is 170~190°C, the screw speed is 60r / min, the melt flow rate of the grafted product is 0.8g / 10min, and the melt strength is 9.3×10 4 Pa·s.
Embodiment 3
[0026] Weigh 483g of polylactic acid, 15g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, 0.5g of processing aid BHT, and 10g of acetone. After the dicumyl oxide is fully dissolved in acetone, it is poured into polylactic acid, and fully mixed in a mixer. After the acetone is completely volatilized, the grafted polylactic acid product is obtained through a twin-screw extruder melting and grafting reaction. The temperature of the twin-screw extruder is 180~200°C, and the screw speed is 80r / min. The melt flow rate of the obtained grafted product is 0.6g / 10min, and the melt strength is 1.48×10 5 Pa·s, the crystallinity increased by 65% to 38%.
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