Hollow microsphere reinforced polylactic acid (PLA)-based composite foaming material and preparation method thereof

Abstract

The invention discloses a hollow microsphere reinforced polylactic acid (PLA)-based composite foaming material and a preparation method thereof. The foaming material has the apparent density of 0.15 to 0.8g / cm<3>, the compressive strength of 7 to 25MPa, the impact strength of 20 to 50KJ / m<2> and the average cell size of 90 to 630mu m and consists of the following raw materials in part by weight: 50 to 93 percent of PLA, 1 to 20 parts of hollow glass microspheres, 1 to 30 parts of biodegradable toughening agent, 1 to 3 parts of nano-nucleating agent, 0.5 to 3 parts of cross-linking agent, 1 to 10 parts of foaming agent, 0.1 to 1 part of foaming aid, 1 to 3 parts of antioxidant, 1 to 2 parts of lubricating agent and 0.5 to 1.5 parts of surfactant. The method comprises the following steps of: extruding and granulating the raw materials at the temperature of between 100 and 190 DEG C, and performing foam forming on a foaming masterbatch on a flat vulcanizing machine at the temperature of between 120 and 200 DEG C. Composite foamed plastic with high mechanical property and surface quality can be prepared.

Description

technical field

[0001] The invention belongs to the field of foaming materials, and in particular relates to a hollow microbead reinforced polylactic acid-based composite foaming material and a preparation method thereof. Background technique

[0002] As a non-renewable resource, oil reserves are very limited. my country's oil consumption is the second largest in the world, while its reserves only account for 2% of the world's total. At the same time, the "white pollution" caused by a large number of petroleum-based plastic products on the market today has also brought great harm to human production and living environment. Therefore, the research and vigorous development of bio-based plastics and their composite materials is the key to solving resources, energy diversification, environmental friendliness, and sustainable development.

[0003] Polylactic acid (PLA), including poly-L-lactic acid (L-PLA), poly-D-lactic acid (D-PLA), and poly-DL-lactic acid (DL-PLA), is a clas...

Examples

Embodiment 1

[0043] The raw material components are by weight: 80 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 5 parts of hollow glass microspheres, 5 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 1 part of di Benzoyl, 3 parts of azodicarbonamide, 0.5 parts of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin, 0.5 parts of sodium dodecylbenzenesulfonate. The molecular weight distribution Mw / Mn value of poly DL-lactic acid is 1.6, and the crystallinity is 35%.

[0044] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat and foam molding on a flat vulcanizing machine at 180 °C, the foaming time is 10min, and the apparent density is 0.40 g / cm 3 Ho...

Embodiment 2

[0046] The raw material components are by weight: 70 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 10 parts of hollow glass microspheres, 10 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 1 part of di Benzoyl, 3 parts of azodicarbonamide, 0.5 parts of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin, 0.5 parts of sodium dodecylbenzenesulfonate.

[0047] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat foam molding on a flat vulcanizing machine at 180 °C, the foaming time is 10min, and the apparent density is 0.43 g / cm 3 Hollow microbeads reinforced polylactic acid-based composite foam materials.

Embodiment 3

[0049] The raw material components are by weight: 60 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 15 parts of hollow glass microspheres, 15 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 0.5 parts of di Cumene, 3 parts of azodicarbonamide, 0.5 part of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin wax, 1 part of sodium dodecylbenzenesulfonate.

[0050] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat and foam on a flat vulcanizing machine at 180 °C, and the foaming time is 5 minutes to obtain an apparent density of 0.45 g / cm 3 Hollow microbeads reinforced polylactic acid-based composite foam materials.

technical field

[0001] The invention belongs to the field of foaming materials, and in particular relates to a hollow microbead reinforced polylactic acid-based composite foaming material and a preparation method thereof. Background technique

[0002] As a non-renewable resource, oil reserves are very limited. my country's oil consumption is the second largest in the world, while its reserves only account for 2% of the world's total. At the same time, the "white pollution" caused by a large number of petroleum-based plastic products on the market today has also brought great harm to human production and living environment. Therefore, the research and vigorous development of bio-based plastics and their composite materials is the key to solving resources, energy diversification, environmental friendliness, and sustainable development.

[0003] Polylactic acid (PLA), including poly-L-lactic acid (L-PLA), poly-D-lactic acid (D-PLA), and poly-DL-lactic acid (DL-PLA), is a clas...

Examples

Embodiment 1

[0043] The raw material components are by weight: 80 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 5 parts of hollow glass microspheres, 5 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 1 part of di Benzoyl, 3 parts of azodicarbonamide, 0.5 parts of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin, 0.5 parts of sodium dodecylbenzenesulfonate. The molecular weight distribution Mw / Mn value of poly DL-lactic acid is 1.6, and the crystallinity is 35%.

[0044] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat and foam molding on a flat vulcanizing machine at 180 °C, the foaming time is 10min, and the apparent density is 0.40 g / cm 3 Ho...

Embodiment 2

[0046] The raw material components are by weight: 70 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 10 parts of hollow glass microspheres, 10 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 1 part of di Benzoyl, 3 parts of azodicarbonamide, 0.5 parts of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin, 0.5 parts of sodium dodecylbenzenesulfonate.

[0047] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat foam molding on a flat vulcanizing machine at 180 °C, the foaming time is 10min, and the apparent density is 0.43 g / cm 3 Hollow microbeads reinforced polylactic acid-based composite foam materials.

Embodiment 3

[0049] The raw material components are by weight: 60 parts of poly DL-lactic acid with a weight average molecular weight of 150,000, 15 parts of hollow glass microspheres, 15 parts of polybutylene succinate, 3 parts of nano calcium carbonate, 0.5 parts of di Cumene, 3 parts of azodicarbonamide, 0.5 part of zinc oxide, 1 part of didodecyl thiodipropionate, 1 part of paraffin wax, 1 part of sodium dodecylbenzenesulfonate.

[0050] According to the above formula, the fully dried raw materials are mixed evenly in a high mixer, then extruded with a twin-screw extruder at 160°C, and pelletized with a pelletizer to prepare a length of 5-10mm and a particle size of about 5mm. foaming masterbatch; put a certain amount of foaming masterbatch in the mold, heat and foam on a flat vulcanizing machine at 180 °C, and the foaming time is 5 minutes to obtain an apparent density of 0.45 g / cm 3 Hollow microbeads reinforced polylactic acid-based composite foam materials.

Images