A kind of fiber/polyurethane/polylactic acid blend and preparation method thereof
A technology of polylactic acid and blends, which is applied in the field of fiber/polyurethane/polylactic acid blends and their preparation, can solve the problems of reduced tensile strength and unsatisfactory toughening results, and achieve improved elongation at break and improved Tensile strength, glass transition temperature, and the effect of increasing tensile strength
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Embodiment 1
[0033] 1) Take 8 kg of PEGA with a number-average molecular weight of 1800 and 1.824 kg of isocyanate (MDI) in a reaction kettle. After mixing evenly, keep the system at 85°C and keep it warm for 2 hours; then cool the system down to 60°C and stir. Add 0.176kg alcohol chain extender (EG), mix evenly, heat up to 70°C for 5h, heat the reaction for 5h, take out the reaction material, and mature it in an oven at 120°C for 4h to obtain TPU; the hard segment of the obtained TPU is The mass ratio in the TPU is 20%, the mass ratio of the soft segment in the TPU is 80%, and the melt index of the TPU obtained is 8g / 10min (under the test condition of 190°C / 2.16kg, the same below);
[0034] 2) get the ramie fiber that length is 2-4mm and place temperature and be 60 ℃, concentration be that 4wt% NaOH aqueous solution soaks 3h, take out, place temperature after draining is 60 ℃, concentration is the KH550 solution (pH of 3wt%) =3, the solvent is a mixed solvent composed of water and absolut...
Embodiment 2
[0042] 1) Take 9kg of PPA with a number-average molecular weight of 2500 and 0.974kg of isocyanate (MDI) in a reactor, mix well, keep the system at 85°C, and keep the temperature for 2 hours; then cool the system to 60°C, and stir Add 0.026kg of alcohol chain extender (BD), mix evenly, raise the temperature to 70°C and keep it warm for 5 hours, take out the reaction material, and mature it in an oven at 120°C for 4 hours to obtain TPU. The hard segment of the obtained TPU is The mass ratio that accounts for in TPU is 10%, and the mass ratio that soft segment accounts for in TPU is 90%, and the melt index of gained TPU is 11g / 10min;
[0043] 2) getting length is that the jute fiber of 2-4mm is placed in temperature and is 60 ℃, concentration is that 15wt% NaOH aqueous solution soaks 3h, takes out, puts temperature after draining and is 80 ℃, concentration is the KH550 solution (pH of 5wt%) =4, the solvent is a mixed solvent composed of water and absolute ethanol in a volume rat...
Embodiment 3
[0059] 1) Take 8.5kg of PEGA with a number average molecular weight of 2500 and 1.371kg of isocyanate (MDI) in a reactor, mix well, keep the system at 90°C, and keep it warm for 2 hours; then cool the system down to 60°C, stirring Add 0.129kg of alcohol chain extender (EG), mix evenly, heat up to 70°C for 4h, heat the reaction for 4h, take out the material obtained from the reaction, and mature it in an oven at 120°C for 4h to obtain TPU; the obtained TPU medium hard segment The mass ratio that accounts for in TPU is 15%, and the mass ratio that soft segment accounts for in TPU is 85%, and the melting index of gained TPU is 18g / 10min;
[0060] 2) getting the sisal fiber of 2-4mm in length and placing it in a KOH aqueous solution with a temperature of 60°C and a concentration of 12wt% for 3h, taking it out, draining it and placing it in a KH550 solution with a temperature of 60°C and a concentration of 3wt% ( pH=4, the solvent is a mixed solvent composed of water and absolute e...
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