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Preparation method of long-fiber reinforced polypropylene microcellular foam material

A microporous foam material and long-fiber technology, applied in the field of preparation of microporous foam materials, can solve the problems of decreased production efficiency and mechanical properties of final products, and achieve the improvement of production efficiency, mechanical properties, strength and modulus The effect of volume increase

Inactive Publication Date: 2016-06-01
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will inevitably lead to a decrease in production efficiency during processing, and at the same time, the mechanical properties of the final product will also decrease after the material has undergone multiple thermomechanical processes.
Current research on the combination of long fiber reinforced thermoplastics (LFT) technology and supercritical CO 2 The combination of extrusion and foaming molding technology for one-step molding to prepare high-performance polypropylene microcellular foaming materials has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 67 parts of polypropylene resin to the extruder through the feeding device, melt and plasticize evenly in the front section of the barrel; add continuous long glass fiber to the extruder in 25 parts by weight at the side feeding port of the twin-screw extruder section, and After the polymer melt is mixed, it is transported to the single-screw extruder; the gas injection port of the single-screw extruder passes through supercritical CO 2 Inject metering device to inject 8 parts by weight of CO 2Foaming agent: the melt mixture mixed uniformly in the single-screw extruder finally passes through the die head of the extruder and foams under reduced pressure to obtain long-fiber reinforced polypropylene extruded foaming material. Among them, the temperature of each section of the barrel of the twin-screw extruder is set as follows: 170°C for the first zone, 190°C for the second zone, 210°C for the third zone, 200°C for the fourth zone, and 200°C for the fifth zone; The t...

Embodiment 2

[0039] Put 60 parts of polypropylene resin particles, 3 parts of talcum powder, 3 parts of maleic anhydride grafted polypropylene, 0.5 parts of antioxidant 1010 and 0.5 parts of antioxidant 168 into a high-speed mixer and mix for 2 minutes, then premix The material is fed into the extruder through the feeding device, and melted and plasticized evenly in the front section of the barrel; the continuous long glass fiber is fed into the extruder at the side feeding port of the twin-screw extruder section in 25 parts by weight, and mixed with the polymer melt Conveyed to single screw extruder; supercritical CO 2 The injection metering device injects 8 parts by weight of CO into the gas injection port of the single-screw extruder. 2 Foaming agent; the melt mixture mixed uniformly in the single-screw extruder is further pressurized after passing through the melt pump, and finally passed through the die head of the extruder to reduce pressure and foam to obtain long fiber reinforced p...

Embodiment 3

[0041] Put 45 parts of polypropylene resin particles, 7.5 parts of talcum powder, 6 parts of maleic anhydride grafted polypropylene, 1 part of antioxidant 1010 and 0.5 parts of antioxidant 168 into a high-speed mixer and mix for 2 minutes, then premix The material is fed into the extruder through the feeding device, and melted and plasticized evenly in the front section of the barrel; the continuous long glass fiber is fed into the extruder in 30 parts by weight at the side feeding port of the twin-screw extruder section, and mixed with the polymer melt Conveyed to single screw extruder; supercritical CO 2 The injection metering device injects 10 parts by weight of CO into the gas injection port of the single-screw extruder. 2 Foaming agent; the melt mixture mixed uniformly in the single-screw extruder is further pressurized after passing through the melt pump, and finally passed through the die head of the extruder to reduce pressure and foam to obtain long fiber reinforced p...

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Abstract

The invention discloses a preparation method of a long-fiber reinforced polypropylene microcellular foam material. The method includes the following steps of adding 45-80 parts of raw material into an extruder, wherein the raw material is polypropylene resin; adding 10-45 parts of long fiber and 2-12 parts of supercritical fluid into the middle section of the extruder respectively to be sufficiently mixed to obtain a melt mixture; making the melt mixture pass through a die head of the extruder to be subjected to depressurization foaming to obtain the long-fiber reinforced polypropylene microcellular foam material, wherein the extruder is formed by connecting a twin-screw extruder with a single-screw extruder in series, the temperature of the first region of the single-screw extruder is 120-140 DEG C, the temperature of the die head is 150-175 DEG C, and the pressure of melt in the die head is 6-20 MPa. Compared with a material where fiber is not added or ordinary short-cut fiber is added, the strength and modulus of the long-fiber reinforced polypropylene microcellular foam material can be remarkably improved; the material is formed, extruded and prepared through one step, continuous industrial production can be achieved, and production efficiency is greatly improved. The material is safe, free of toxin, green and environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method of a microcellular foaming material, in particular, the invention relates to a preparation method of a long fiber reinforced polypropylene microcellular foaming material. Background technique [0002] Polymer foam material refers to a polymer-based microporous material with numerous bubbles inside, and can also be regarded as a composite material filled with gas. Foaming materials are widely used in daily necessities, vehicles, household appliances, packaging materials, insulating materials, building materials, aerospace industry and other fields due to their advantages of light weight, high specific strength, heat insulation and sound insulation. At present, the most common polymer foam materials are polyurethane (PU) foam materials, polystyrene (PS) foam materials, polyethylene (PE) foam materials and polypropylene (PP) foam materials. PU, PS and PE foaming materials have problems and shortcomings that a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/06C08K13/04C08K7/14C08K3/34C08J9/12B29C47/92B29C47/14B29C48/305B29C48/92
CPCC08K7/14B29C48/11B29C48/30B29C48/305B29C48/92B29C2948/92514B29C2948/92704B29C2948/92895B29C2948/92904C08J9/122C08J2203/06C08J2203/08C08J2323/12C08J2451/06C08L23/12C08L2203/14C08L51/06C08K13/04C08K3/34
Inventor 吕冬林红吴景深
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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