Polylactic acid/starch whole biological-base composite material and preparation method of composite material
A composite material and polylactic acid technology, which is applied in the field of polylactic acid/starch full bio-based composite materials and their preparation, can solve the problems of reducing the tensile strength at break of polylactic acid, heat tolerance of polylactic acid, and increasing the brittleness of polylactic acid. The effect of no serious loss of modulus, high heat resistance temperature and fast crystallization rate
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[0039] Preparation of dextro-polylactic acid polyurethane elastomer:
[0040] Firstly, the dextro-polylactide polyol (number average molecular weight is 2000), isophorone diisocyanate and dibutyltin dilaurate are reacted at 85℃ for 2h under the protection of protective gas (nitrogen) to obtain the prepolymer , Then add the chain extender 1,4-butanediol to carry out the chain extension reaction for 4h, after the reaction, remove the solvent to obtain the right-handed lactide polyol polyurethane elastomer (that is, the right-handed polylactic acid type polyurethane elastomer). The molar ratio of dextro-polylactide polyol, isophorone diisocyanate, and 1,4-butanediol chain extender is 1:3:2, dibutyltin dilaurate catalyst and dextro-polylactide The molar ratio of ester polyol is 0.005:1.
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[0041] Example 1
[0042] Take the prepared dextro-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its mass parts is 85) and corn starch (10 parts by mass) after mixing uniformly (first in the initial The temperature is 40℃ for pre-mixing, the pre-mixer is slowly increased from low speed 800 rpm to high speed 1200 rpm, mixing for 30 minutes), melt blending in a twin-screw extruder, and the extrusion temperature of the first to sixth stages are successively 175℃±5, 180℃±5, 185℃±5, 190℃±5, 180℃±5, 180℃±5. After cooling the extrudate, it is pelletized by a pelletizer to obtain pellets. The material was dried in a vacuum drying oven at 85°C for 12 hours to prepare a dextro-polylactic acid polyurethane / polylactic acid / starch composite pellet. According to GB / T1040.1-2006 and ISO 179-1:98, dextrorotary polylactic acid polyurethane toughened and heat-resistant modified polylactic acid / starch composi...
Example Embodiment
[0043] Example 2
[0044] Take the prepared dextro-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its mass parts is 75) and corn starch (20 parts by mass) after mixing uniformly (first in the initial The temperature is 40℃ for pre-mixing, the pre-mixer is slowly increased from low speed 800 rpm to high speed 1200 rpm, mixing for 30 minutes), melt blending in a twin-screw extruder, and the extrusion temperature of the first to sixth stages are successively 175℃±5, 180℃±5, 185℃±5, 190℃±5, 180℃±5, 180℃±5. After cooling the extrudate, it is pelletized by a pelletizer to obtain pellets. The material was dried in a vacuum drying oven at 85°C for 12 hours to prepare a dextro-polylactic acid polyurethane / polylactic acid / starch composite pellet. According to GB / T1040.1-2006 and ISO 179-1:98, dextrorotary polylactic acid polyurethane toughened and heat-resistant modified polylactic acid / starch composi...
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