Method for preparing high-strength and high-toughness polypropylene/glass fiber composite material through one-step method

Abstract

The invention relates to the technical field of polymer material modification. The invention particularly relates to a method for preparing a high-strength and high-toughness polypropylene / glass fibercomposite material through a one-step method. The preparation method comprises the following steps: uniformly mixing PP, MAH and an initiator; adding the mixture into a double-screw extruder from a main feeding hole of the double-screw extruder for melt grafting to obtain PP-g-MAH uniformly dispersed in a PP matrix; adding GF from a side feeding port or a GF adding port, and further melting and mixing PP and GF under the action of screw shearing and heat; and conveying the mixture to an extruder head, and carrying out extruding, cooling, drying and granulating to obtain the high-strength high-toughness PP / GF composite material. According to the invention, the defect of poor mechanical strength caused by non-uniform dispersion of internal components when the PP / GF composite material is prepared by a two-step method in the prior art is overcome, the defect of high cost is also overcome, the uniformity of the interface interaction between GF and a PP matrix is improved, the mechanical property of the PP / GF composite material is improved, and the cost is reduced.

Description

technical field

[0001] The invention relates to the technical field of polymer material modification, in particular to a method for preparing a high-strength and high-toughness polypropylene / glass fiber composite material through a one-step method. Background technique

[0002] As one of the five general-purpose plastics, polypropylene (PP) plastic has the advantages of excellent corrosion resistance, electrical insulation, and easy processing and molding. However, there are disadvantages such as low strength, flammability, and easy cracking at low temperature, which limit its application in the field of high strength and high toughness.

[0003] At present, the solution is mainly to use glass fiber (GF) to reinforce PP, and to prepare high-strength and high-toughness PP / GF composite materials by controlling the length and content of GF, and the interface compatibility between PP and GF. Therefore, improving the interfacial compatibility between PP and GF has become an impo...

Examples

Embodiment 1

[0022] Mix 65 parts of homopolymerized PP, 25 parts of copolymerized PP, 0.3 parts of MAH and 0.02 parts of initiator DCP, and then feed it into the twin-screw extruder at 180°C to 220°C from the main feeding port of the twin-screw extruder. At 30r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 10 parts of long GF treated with γ-aminopropyltriethoxysilane from the GF inlet. The diameter of GF is 30 μm. Under the action of screw shear and heat, PP and long GF are further melted and mixed, and transported to the extruder. Out of the machine head, after extrusion, cooling, drying and pelletizing, the PP / GF composite material is obtained.

Embodiment 2

[0024] Mix 50 parts of homopolymerized PP, 20 parts of copolymerized PP, 0.3 parts of MAH and 0.02 parts of initiator DCP evenly, and then feed it into the twin-screw extruder at 180℃~220℃ from the main feeding port of the twin-screw extruder. At 60r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 30 parts of long GF treated with silane coupling agent such as vinyltriethoxysilane from the GF inlet. The diameter of GF is 3 μm. Under the action of screw shear and heat, PP and long GF are further melted and mixed, and conveyed To the head of the extruder, after extrusion, cooling, drying and pelletizing, the PP / GF composite material is obtained.

Embodiment 3

[0026] After mixing 44 parts of homopolymerized PP, 16 parts of copolymerized PP, 0.3 parts of MAH and 0.05 parts of initiator DCP, it is added to the twin-screw extruder at 180 ° C ~ 220 ° C from the main feeding port of the twin-screw extruder. At 60r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 40 parts of isopropyl tri(dioctylphosphoryl) titanate long-treated GF from the GF inlet, the diameter of GF is 20 μm, and add 10 parts of isopropyl tri(dioctylphosphorus) Acyl) titanate long-treated short GF, under the action of screw shear and heat, PP and GF are further melted and mixed, and transported to the head of the extruder, after extrusion, cooling, drying, and pelletizing, the obtained PP / GF composite material.

technical field

[0001] The invention relates to the technical field of polymer material modification, in particular to a method for preparing a high-strength and high-toughness polypropylene / glass fiber composite material through a one-step method. Background technique

[0002] As one of the five general-purpose plastics, polypropylene (PP) plastic has the advantages of excellent corrosion resistance, electrical insulation, and easy processing and molding. However, there are disadvantages such as low strength, flammability, and easy cracking at low temperature, which limit its application in the field of high strength and high toughness.

[0003] At present, the solution is mainly to use glass fiber (GF) to reinforce PP, and to prepare high-strength and high-toughness PP / GF composite materials by controlling the length and content of GF, and the interface compatibility between PP and GF. Therefore, improving the interfacial compatibility between PP and GF has become an impo...

Examples

Embodiment 1

[0022] Mix 65 parts of homopolymerized PP, 25 parts of copolymerized PP, 0.3 parts of MAH and 0.02 parts of initiator DCP, and then feed it into the twin-screw extruder at 180°C to 220°C from the main feeding port of the twin-screw extruder. At 30r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 10 parts of long GF treated with γ-aminopropyltriethoxysilane from the GF inlet. The diameter of GF is 30 μm. Under the action of screw shear and heat, PP and long GF are further melted and mixed, and transported to the extruder. Out of the machine head, after extrusion, cooling, drying and pelletizing, the PP / GF composite material is obtained.

Embodiment 2

[0024] Mix 50 parts of homopolymerized PP, 20 parts of copolymerized PP, 0.3 parts of MAH and 0.02 parts of initiator DCP evenly, and then feed it into the twin-screw extruder at 180℃~220℃ from the main feeding port of the twin-screw extruder. At 60r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 30 parts of long GF treated with silane coupling agent such as vinyltriethoxysilane from the GF inlet. The diameter of GF is 3 μm. Under the action of screw shear and heat, PP and long GF are further melted and mixed, and conveyed To the head of the extruder, after extrusion, cooling, drying and pelletizing, the PP / GF composite material is obtained.

Embodiment 3

[0026] After mixing 44 parts of homopolymerized PP, 16 parts of copolymerized PP, 0.3 parts of MAH and 0.05 parts of initiator DCP, it is added to the twin-screw extruder at 180 ° C ~ 220 ° C from the main feeding port of the twin-screw extruder. At 60r / min, under the action of the initiator, MAH was evenly grafted onto the PP molecular chain. Add 40 parts of isopropyl tri(dioctylphosphoryl) titanate long-treated GF from the GF inlet, the diameter of GF is 20 μm, and add 10 parts of isopropyl tri(dioctylphosphorus) Acyl) titanate long-treated short GF, under the action of screw shear and heat, PP and GF are further melted and mixed, and transported to the head of the extruder, after extrusion, cooling, drying, and pelletizing, the obtained PP / GF composite material.

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