PLA biodegradable composite material and preparation method thereof

Abstract

The invention discloses a PLA biodegradable composite material and a preparation method thereof. The PLA biodegradable composite material is prepared from, by weight, 100 to 120 parts of PLA, 20 to 30 parts of PBAT, 10 to 15 parts of polyester, 2 to 5 parts of fatty glyceride, 3 to 8 parts of vegetable oil and 1 to 4 parts of a compatilizer. According to the composite material disclosed by the invention, the PLA is taken as a main raw material, the PBAT is added to improve the brittleness of the PLA, and meanwhile, the polyester, fatty glyceride, vegetable oil and the compatilizer are supplemented to improve the compatibility of the PLA and the PBAT, so that the phase interface of the dispersed phase PBAT and the matrix PLA is improved, and the impact strength and tensile strength of the composite material are further improved.

Description

technical field

[0001] The invention relates to a PLA biodegradable composite material and a preparation method thereof, belonging to the technical field of plastics. Background technique

[0002] Polylactic acid (PLA) is a thermoplastic polymer with high tensile strength and fully biodegradable. It has a wide range of potential applications, but it has disadvantages such as brittleness, poor heat resistance, low melt strength, and narrow processing range. The application in many fields is limited, so the research on the toughening modification of PLA has become the focus of attention in recent years. The currently used toughening modification methods include: copolymerization, adding fillers, blending with other tough polymers, etc.

[0003] PBAT is an aromatic polyester with excellent toughness (elongation at break > 500%) and biodegradability, so melt blending PBAT with PLA is an effective way to improve the brittleness of PLA without destroying the reliability of the...

Examples

Embodiment 1

[0019] A PLA biodegradable composite material comprises the following raw materials in parts by weight: 100 parts of PLA, 20 parts of PBAT, 10 parts of polyester, 2 parts of fatty acid glyceride, 3 parts of corn oil and 1 part of polycaprolactone. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0020] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0021] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0022] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer, then add them to the twin-screw extruder, melt, extrude, pelletize, repeat the extrusion steps three times, and dry Composite materials are produced.

[0023] Among them, the temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C, and the head temperature is 170°C.

Embodiment 2

[0025] A PLA biodegradable composite material, comprising the following raw materials in parts by weight: 120 parts of PLA, 30 parts of PBAT, 15 parts of polyester, 5 parts of fatty acid glycerides, 8 parts of sunflower oil and 4 parts of maleic anhydride graft compatibilizer share. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0026] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0027] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0028] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer and add them to the twin-screw extruder, and repeat the steps of melting, extruding, pelletizing and extruding four times, Dry to obtain a composite material.

[0029] Among them, the temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C,...

Embodiment 3

[0031] A PLA biodegradable composite material comprises the following raw materials in parts by weight: 110 parts of PLA, 25 parts of PBAT, 12 parts of polyester, 3 parts of fatty acid glyceride, 6 parts of peanut oil and 2 parts of polycaprolactone. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0032] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0033] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0034] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer, then add them to the twin-screw extruder, melt, extrude, pelletize, repeat the extrusion steps three times, and dry Composite materials are produced. The temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C respectively, and the head temperature is 170°C.

technical field

[0001] The invention relates to a PLA biodegradable composite material and a preparation method thereof, belonging to the technical field of plastics. Background technique

[0002] Polylactic acid (PLA) is a thermoplastic polymer with high tensile strength and fully biodegradable. It has a wide range of potential applications, but it has disadvantages such as brittleness, poor heat resistance, low melt strength, and narrow processing range. The application in many fields is limited, so the research on the toughening modification of PLA has become the focus of attention in recent years. The currently used toughening modification methods include: copolymerization, adding fillers, blending with other tough polymers, etc.

[0003] PBAT is an aromatic polyester with excellent toughness (elongation at break > 500%) and biodegradability, so melt blending PBAT with PLA is an effective way to improve the brittleness of PLA without destroying the reliability of the...

Examples

Embodiment 1

[0019] A PLA biodegradable composite material comprises the following raw materials in parts by weight: 100 parts of PLA, 20 parts of PBAT, 10 parts of polyester, 2 parts of fatty acid glyceride, 3 parts of corn oil and 1 part of polycaprolactone. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0020] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0021] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0022] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer, then add them to the twin-screw extruder, melt, extrude, pelletize, repeat the extrusion steps three times, and dry Composite materials are produced.

[0023] Among them, the temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C, and the head temperature is 170°C.

Embodiment 2

[0025] A PLA biodegradable composite material, comprising the following raw materials in parts by weight: 120 parts of PLA, 30 parts of PBAT, 15 parts of polyester, 5 parts of fatty acid glycerides, 8 parts of sunflower oil and 4 parts of maleic anhydride graft compatibilizer share. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0026] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0027] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0028] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer and add them to the twin-screw extruder, and repeat the steps of melting, extruding, pelletizing and extruding four times, Dry to obtain a composite material.

[0029] Among them, the temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C,...

Embodiment 3

[0031] A PLA biodegradable composite material comprises the following raw materials in parts by weight: 110 parts of PLA, 25 parts of PBAT, 12 parts of polyester, 3 parts of fatty acid glyceride, 6 parts of peanut oil and 2 parts of polycaprolactone. The PLA density is 1.24g / cm 3 , is a semi-crystalline material.

[0032] A preparation method of PLA biodegradable composite material, comprising the following steps:

[0033] (1) Place PLA and PBAT in a vacuum drying oven and dry at 60°C for 12 hours to remove small molecule residues and moisture;

[0034] (2) Mix the dried PLA, PBAT, polyester parts, fatty acid glycerides, vegetable oil and compatibilizer, then add them to the twin-screw extruder, melt, extrude, pelletize, repeat the extrusion steps three times, and dry Composite materials are produced. The temperatures in zones 1-9 of the extruder are 155°C, 155°C, 165°C, 165°C, 170°C, 170°C, 170°C, 165°C, 165°C respectively, and the head temperature is 170°C.

Images