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Polyurethane/polylactic acid blend and preparation method thereof

A polylactic acid and polyurethane technology, which is applied in the field of polyurethane/polylactic acid blends and their preparation, can solve the problems of unsatisfactory toughening results and reduced tensile strength, and achieves improvement in tensile strength and glass transition temperature, and increases in Elongation at break, the effect of simple and easy operation

Active Publication Date: 2019-04-16
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the content of polyurethane is 20%, the elongation at break of polylactic acid is only increased by 3.3 times, while the tensile strength is reduced by 33% (see section 2.1 of the literature for details), and its toughening result is obviously not enough ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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 of chain extender (EG), mix well, 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 in the TPU The mass ratio occupied by the soft segment is 20%, the mass ratio occupied by the soft segment in the TPU is 80%, and the melt index of the obtained TPU is 8g / 10min (under the test condition of 190°C / 2.16kg, the same below);

[0030] 2) Take 2.0kg of TPU prepared in step 1) and 8.0kg of PLA with a melt index of 2g / 10min and mix evenly. The cooling roll is cooled to obtain a polyurethane / polylactic acid sheet.

[0031] The tensile strength, elongation at break and glass transition tempe...

Embodiment 2

[0037] 1) Take 9kg of PEGA with a number-average molecular weight of 2500 and 0.974kg 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 0.026kg of chain extender (BD), mix well, 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 in the TPU The mass ratio of the soft segment is 10%, the mass ratio of the soft segment in the TPU is 90%, and the melt index of the TPU obtained is 11g / 10min;

[0038] 2) Take 2.0kg of TPU prepared in step 1) and 8.0kg of PLA with a melt index of 6g / 10min and mix evenly. The cooling roll is cooled to obtain a polyurethane / polylactic acid sheet.

[0039] The tensile strength, elongation at break and glass transition temperature of the polyurethane / polylactic acid sheet obtained in this embodiment a...

Embodiment 3

[0053] 1) Take 8 kg of PEGA with a number-average molecular weight of 1000 and 1.824 kg of isocyanate (HDI) in a reactor. After mixing evenly, keep the system at 90°C and keep it warm for 1 hour; then cool the system down to 60°C and stir Add 0.176kg of chain extender (EG), mix well, raise the temperature to 70°C and keep it warm for 4 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 in the TPU The mass ratio of the soft segment is 20%, the mass ratio of the soft segment in the TPU is 80%, and the melt index of the TPU obtained is 6g / 10min;

[0054] 2) Take 2.0kg of TPU prepared in step 1) and 8.0kg of PLA with a melt index of 6g / 10min and mix evenly. The cooling roll is cooled to obtain a polyurethane / polylactic acid sheet.

[0055] The tensile strength, elongation at break and glass transition temperature of the polyurethane / polylactic acid sheet obtained in this embodiment are detect...

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Abstract

The invention discloses a polyurethane / polylactic acid blend and a preparation method thereof. The polyurethane / polylactic acid blend is prepared from, by mass, 5-20% of polyester type thermoplastic polyurethane and the balance polylactic acid; the polyester type thermoplastic polyurethane is the polyester type thermoplastic polyurethane with an amorphous structure, the polyester type thermoplastic polyurethane is composed of a soft segment and a hard segment, and the polyester type thermoplastic polyurethane is prepared from, by mass, 75-90% of the soft segment and the balance hard segment; the soft segment is polyethyl dialcohol adipate of which the number-average molecular weight is 1000-2500, and the hard segment is composed of isocyanate and a chain extender. The polyurethane / polylactic acid blend obviously increases the elongation at break of an obtained modified material, and also does not obviously reduce the tensile strength and glass-transition temperature of the modified material.

Description

technical field [0001] The invention relates to a polylactic acid modified material, in particular to a polyurethane / polylactic acid blend and a preparation method thereof. Background technique [0002] The demand for biodegradable plastics is increasing due to the increasing problems of "white waste" and the shortage of petroleum resources and environmental pollution caused by traditional plastics. Polylactic acid (PLA) is regarded as the most promising biodegradable plastic because of its outstanding characteristics such as good processability, mechanical properties, transparency, and sufficient and renewable raw material sources. However, the high brittleness of polylactic acid has become the biggest obstacle restricting its wide application. In order to improve the brittleness and toughness of polylactic acid, many enterprises and scientific research institutes have carried out a lot of modification research on polylactic acid. [0003] At present, the brittle modifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06
CPCC08L67/04C08L2207/04C08L75/06
Inventor 陈志平冯羽风黄孙息钟立松
Owner GUILIN ELECTRICAL EQUIP SCI RES INST