Preparation method of high-fluidity camellia oleifera shell powder PLA / PBAT wood-plastic composite master batch

Abstract

The invention relates to the technical field of environment-friendly master batches, in particular to a preparation method of a high-flowability oil tea shell powder PLA / PBAT wood-plastic composite master batch, PLA / PBAT and oil tea shell powder are used as main components of the composite master batch, the advantage that the composite master batch can be completely degraded is guaranteed, meanwhile, most of added auxiliaries are environment-friendly auxiliaries, and therefore the environment-friendly wood-plastic composite master batch is environmentally friendly. Therefore, the composite master batch has the characteristic of environmental friendliness. A plurality of auxiliaries are added in the master batch preparation process, the binding force between the PLA / PBAT and the camellia oleifera shell powder is enhanced, and the prepared composite master batch can improve the flowability and strength of the PLA / PBAT master batch and has stability and good mechanical strength in various environments.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection masterbatch, and particularly relates to a preparation method of a high-fluidity oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch. Background Art

[0002] Polylactic acid (PLA) is a biodegradable thermoplastic polyester masterbatch, which is polymerized from lactic acid in renewable resources. Due to its good environmental protection characteristics and biocompatibility, PLA is widely used in the field of plastic products, contributing to environmental protection and sustainable development; polybutylene adipate terephthalate (PBAT) belongs to a biodegradable polyester, with excellent toughness and heat resistance. With its excellent processing performance and environmental protection characteristics, PBAT is widely used in the fields of medical treatment, packaging materials, agriculture, etc.; however, the prices of PLA and PBAT are relatively high, and their solid-state fluidity is poor, showing relatively large brittleness, which also limits the application of PLA and PBAT in multiple fields.

[0003] Based on the current shortcomings of PLA / PPBAT and the contradiction between environmental protection masterbatches, the research focus is on compounding PLA / PBAT with degradable substances to form environmental protection masterbatches; the application of plant fiber masterbatches in plastic modification has gradually attracted the attention of countries around the world. As agricultural waste, oil-tea shells will emit a large amount of thick smoke during incineration, polluting the environment, while the processed oil-tea shell powder has been proven to play a positive role in plastic modification. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of a high-fluidity oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch, which solves the technical problem of environmental pollution caused by the incineration of oil-tea shells.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A preparation method of a high-fluidity oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch, the prepared oil-tea shell powder PLA / PBTAT wood-plastic composite masterbatch has high fluidity and can be completely degraded, and the preparation method includes the following steps;

[0006] a. Take the pulverized oil-tea shell powder with a particle size of 60 mesh, dry it in a drying oven at a drying temperature of 95°C for 2 hours;

[0007] b. Take a 5% silane coupling agent KH570, fully immerse the dried oil-tea shell powder, let it stand for 2 hours at 80°C, and then dry it again at 100°C for 2 hours;

[0008] c. Take 25% - 30% PLA, 10% - 15% PBAT plastic, and 5% silane coupling agent KH570, and uniformly mix them in a high-speed mixer at a mixing temperature of 180°C for 20 minutes. After drying, raw material A is obtained;

[0009] d. Take 35% - 45% camellia shell powder, 0.1% zinc stearate, 1.4% compound antioxidant, 3.5% plasticizer, 1% flame retardant, and 9% ultra-fine talc powder, and uniformly mix them with raw material A in a mixer at a mixing temperature of 80°C for 20 minutes. After drying, raw material B is obtained;

[0010] e. Extrude the raw material B through a twin-screw extruder to obtain mixed pellets at an extrusion temperature of 170°C, and then crush the mixed pellets in a crusher;

[0011] f. Mold the crushed mixed pellets in a flat vulcanizing machine, heat them at 180°C for 20 minutes, then apply a molding pressure of 7 MPa and hold the pressure for 25 minutes to obtain the camellia shell powder PLA / PBAT wood-plastic composite masterbatch.

[0012] By the above technical solutions, the present invention provides a preparation method of a high-fluidity camellia shell powder PLA / PBAT wood-plastic composite masterbatch, which at least has the following beneficial effects:

[0013] The present invention uses PLA / PBAT and camellia shell powder as the main components of the composite masterbatch, ensuring that the composite masterbatch has the advantage of being completely degradable. At the same time, most of the added auxiliaries are environmentally friendly auxiliaries, so that the composite masterbatch has the characteristics of environmental friendliness. Adding a variety of auxiliaries in the masterbatch preparation process can enhance the bonding force between PLA / PBAT and camellia shell powder. The composite masterbatch prepared by the present invention can improve the fluidity and strength of the PLA / PBAT masterbatch, and has stability and good mechanical strength in various environments. Specific Embodiments

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0015] Example 1

[0016] A preparation method of a high-fluidity camellia shell powder - PLA / PBAT wood-plastic composite masterbatch includes the following steps:

[0017] a. Take the crushed camellia shell powder with a particle size of 60 mesh, and dry it at a drying temperature of 95°C for 3 hours;

[0018] b. Take a silane coupling agent with a concentration of 5%, fully soak the dried oil-tea shell powder, let it stand for 2 h at 80 °C, and then dry it again at 100 °C for 2 h;

[0019] c. Take 30% PLA, 15% PBAT plastic, and 5% silane coupling agent KH-570, and uniformly mix them in a high-speed mixer at a mixing temperature of 180 °C for a mixing duration of 20 min. After drying, raw material A is obtained;

[0020] d. Take 35% oil-tea shell powder, 0.1% zinc stearate, 1.4% compound antioxidant, 3.5% plasticizer, 1% flame retardant, and 9% ultra-fine talc powder, and uniformly mix them with raw material A in a mixer at a mixing temperature of 80 °C for a mixing time of 20 min. After drying, raw material B is obtained;

[0021] e. Extrude the raw material B through a twin-screw extruder to obtain mixed pellets at an extrusion temperature of 170 °C, and then crush the mixed pellets in a crusher;

[0022] f. Mold the crushed mixed pellets in a flat vulcanizing machine, heat them at 180 °C for 20 min, then apply a molding pressure of 7 MPa, and keep the pressure for 25 min to obtain the oil-tea shell powder-PLA / PBAT wood-plastic composite masterbatch. Example 2

[0023] This example is based on Example 1 and has the same beneficial effects as Example 1. For the same parts, refer to each other and will not be elaborated in detail here.

[0024] a. Take the crushed oil-tea shell powder with a particle size of 60 mesh, and dry it at a drying temperature of 95 °C for a drying time of 3 h;

[0025] b. Take a silane coupling agent with a concentration of 5%, fully soak the dried oil-tea shell powder, let it stand for 2 h at 80 °C, and then dry it again at 100 °C for 2 h;

[0026] c. Take 25% PLA, 15% PBAT plastic, and 5% silane coupling agent KH-570, and uniformly mix them in a high-speed mixer at a mixing temperature of 180 °C for a mixing duration of 20 min. After drying, raw material A is obtained;

[0027] d. Take 40% oil-tea shell powder, 0.1% zinc stearate, 1.4% compound antioxidant, 3.5% plasticizer, 1% flame retardant, and 9% ultra-fine talc powder, and uniformly mix them with raw material A in a mixer at a mixing temperature of 80 °C for a mixing time of 20 min. After drying, raw material B is obtained;

[0028] e. Extrude the mixture into pellets through a twin-screw extruder at an extrusion temperature of 170 °C, and then crush the pellets in a pulverizer.

[0029] f. Mold the crushed pellets in a flat vulcanizing machine. Heat at 180 °C for 20 min, then apply a molding pressure of 7 MPa and hold the pressure for 25 min to obtain the camellia shell powder-PLA / PBAT wood-plastic composite masterbatch.

[0030] Example 3

[0031] This example is based on Example 1 and has the same beneficial effects as Example 1. For the same parts, please refer to each other and will not be elaborated here in detail.

[0032] As the preferred technical solution of this example:

[0033] a. Take the crushed camellia shell powder with a particle size of 60 mesh and dry it at a drying temperature of 95 °C for 3 h.

[0034] b. Take a 5% silane coupling agent and fully immerse the dried camellia shell powder. Let it stand at 80 °C for 2 h and then dry it again at 100 °C for 2 h.

[0035] c. Take 25% PLA, 10% PBAT plastic, and 5% silane coupling agent KH-570, and mix them evenly in a high-speed mixer at a mixing temperature of 180 °C for 20 min. After drying, obtain raw material A.

[0036] d. Take 45% camellia shell powder, 0.1% zinc stearate, 1.4% compound antioxidant, 3.5% plasticizer, 1% flame retardant, and 9% ultra-fine talc powder, and mix them evenly with raw material A in a mixer at a mixing temperature of 80 °C for 20 min. After drying, obtain raw material B.

[0037] e. Extrude the mixture into pellets through a twin-screw extruder at an extrusion temperature of 170 °C, and then crush the pellets in a pulverizer.

[0038] f. Mold the crushed pellets in a flat vulcanizing machine. Heat at 180 °C for 20 min, then apply a molding pressure of 7 MPa and hold the pressure for 25 min to obtain the camellia shell powder-PLA / PBAT wood-plastic composite masterbatch.

[0039] For the oil-tea shell powder-PLA / PBAT wood-plastic composite masterbatches in Examples 1 to 3, the tensile strength, flexural strength, impact strength, and melt flow rate of the test samples were respectively tested according to GB / T 1040.2-2006, GB 1042-79, GB / T 1843-2008, and GB 3682-1983. The test results are shown in the following table:

[0040]

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a high-fluidity oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch, characterized in that, The prepared oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch has high fluidity and can be completely degraded. The preparation method includes the following steps; a. Take the pulverized oil-tea shell powder with a particle size of 60 mesh, dry it in an oven at a drying temperature of 95°C for 2 hours; b. Take a 5% silane coupling agent KH570, fully immerse the dried oil-tea shell powder, let it stand for 2 hours at 80°C, and then dry it again at 100°C for 2 hours; c. Take 25% - 30% PLA, 10% - 15% PBAT plastic, and 5% silane coupling agent KH570, and uniformly mix them in a high-speed mixer at a mixing temperature of 180°C for 20 minutes. After drying, raw material A is obtained; d. Take 35% - 45% oil-tea shell powder, 0.1% zinc stearate, 1.4% compound antioxidant, 3.5% plasticizer, 1% flame retardant, and 9% ultrafine talc powder, and uniformly mix them with raw material A in a mixer at a mixing temperature of 80°C for 20 minutes. After drying, raw material B is obtained; e. Extrude the raw material B through a twin-screw extruder to obtain mixed pellets, with an extrusion temperature of 170°C, and crush the mixed pellets in a crusher; f. Mold the crushed mixed pellets in a flat vulcanizing machine, heat them at 180°C for 20 minutes, then apply a molding pressure of 7 MPa, and keep the pressure for 25 minutes to obtain the oil-tea shell powder PLA / PBAT wood-plastic composite masterbatch.

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