A kind of preparation method of high tenacity dyeable fully degradable pla-pha material

Abstract

The invention belongs to the technical field of degradable materials, and in particular relates to a method for preparing a fully degradable PLA-PHA material with high toughness and dyeability, comprising the following steps: (1) weighing PLA powder and PHA powder, and mixing them evenly after drying to obtain a mixture (2) Add polyester stabilizer, antioxidant and nucleating agent to the mixture in step (1), mix well, melt and extrude through a twin-screw extruder, cut into pellets by water cooling, and dry to make master batches ; The weight parts of each substance in the step (1) and step (2) are: 60-80 parts of PLA powder, 20-30 parts of PHA powder, 0.5-2 parts of polyester stabilizer, 0.1-1 part of antioxidant , 0.1-1 part of nucleating agent. The molar content of 4-hydroxybutyric acid in the PHA of the present invention is 20-25 mol%, and the higher content of 4-hydroxybutyric acid can significantly improve the flexibility of the composite material, so that the present invention can be obtained without adding a plasticizer The high toughness PLA‑PHA composite material ensures high toughness without affecting the mechanical properties such as tensile strength of the material.

Description

technical field

[0001] The invention belongs to the technical field of degradable materials, and in particular relates to a preparation method of a high-toughness dyeable fully degradable PLA-PHA material. Background technique

[0002] In recent years, polylactic acid (PLA) has been used more and more to make daily consumer goods, such as textiles, non-woven fabrics, etc. PLA is a thermoplastic material with good mechanical properties and processability. Products made of polylactic acid can be degraded by composting after being discarded, which meets today's environmental protection requirements. However, the disadvantages of polylactic acid are also prominent. Its heat resistance is poor, its toughness is insufficient, it is easy to crystallize and become brittle, and it is not easy to dye. Due to the low coloring rate and poor color fastness of polylactic acid products, polylactic acid textile products are mostly light-colored. Products, and the color vividness is not hig...

Examples

Embodiment Construction

[0031] The present invention is described in further detail now in conjunction with embodiment.

[0032] The preparation method of high tenacity dyeable fully degradable PLA-PHA material is characterized in that: comprising the following steps:

[0033] (1) Take PLA powder and PHA powder, mix after drying, obtain mixture;

[0034] (2) Add polyester stabilizer, antioxidant and nucleating agent to the mixture in step (1), mix thoroughly, melt and extrude through a twin-screw extruder, water-cool and cut into pellets, and dry to make master batches.

[0035] Wherein, the drying method of the polyhydroxyalkanoate powder in step (1) is: put the polyhydroxyalkanoate powder into the vacuum drum drying equipment and dry for 8-10 hours, the drying temperature is 70-80°C, the polyhydroxyalkanoate The water content of the ester powder is controlled below 30PPM; the drying method of the polylactic acid powder in step (1) is: put the polylactic acid powder in a vacuum drum drying equipmen...

technical field

[0001] The invention belongs to the technical field of degradable materials, and in particular relates to a preparation method of a high-toughness dyeable fully degradable PLA-PHA material. Background technique

[0002] In recent years, polylactic acid (PLA) has been used more and more to make daily consumer goods, such as textiles, non-woven fabrics, etc. PLA is a thermoplastic material with good mechanical properties and processability. Products made of polylactic acid can be degraded by composting after being discarded, which meets today's environmental protection requirements. However, the disadvantages of polylactic acid are also prominent. Its heat resistance is poor, its toughness is insufficient, it is easy to crystallize and become brittle, and it is not easy to dye. Due to the low coloring rate and poor color fastness of polylactic acid products, polylactic acid textile products are mostly light-colored. Products, and the color vividness is not hig...

Examples

Embodiment Construction

[0031] The present invention is described in further detail now in conjunction with embodiment.

[0032] The preparation method of high tenacity dyeable fully degradable PLA-PHA material is characterized in that: comprising the following steps:

[0033] (1) Take PLA powder and PHA powder, mix after drying, obtain mixture;

[0034] (2) Add polyester stabilizer, antioxidant and nucleating agent to the mixture in step (1), mix thoroughly, melt and extrude through a twin-screw extruder, water-cool and cut into pellets, and dry to make master batches.

[0035] Wherein, the drying method of the polyhydroxyalkanoate powder in step (1) is: put the polyhydroxyalkanoate powder into the vacuum drum drying equipment and dry for 8-10 hours, the drying temperature is 70-80°C, the polyhydroxyalkanoate The water content of the ester powder is controlled below 30PPM; the drying method of the polylactic acid powder in step (1) is: put the polylactic acid powder in a vacuum drum drying equipmen...

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