Method of preparing fiber reinforced polypropylene composites

A technology of fiber reinforcement and polypropylene, which is applied in the field of products prepared from polypropylene compositions, and can solve problems affecting the dispersion of PET fibers and the mechanical properties of PET fibers, etc.

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More specifically, the configuration of the extrusion mixing screw may affect the dispersion of PET fibers within the PP matrix, and the extrusion mixing process conditions may not only affect the mechanical properties of the matrix polymer, but also the mechanical properties of PET fibers

Method used

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  • Method of preparing fiber reinforced polypropylene composites
  • Method of preparing fiber reinforced polypropylene composites
  • Method of preparing fiber reinforced polypropylene composites

Examples

Experimental program
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preparation example Construction

[0046] The present invention is not limited to any particular polymerization process for preparing the matrix polypropylene, and the polymerization processes described herein are not limited to any particular type of reaction vessel. For example, the matrix polypropylene can be prepared using any of the known solution polymerization, slurry polymerization, bulk polymerization, gas phase polymerization methods, and combinations thereof. Furthermore, the present invention is not limited to any particular catalyst for the production of polypropylene, and may include Ziegler-Natta or metallocene catalysts, for example.

[0047] The compositions of the invention generally comprise at least 10% by weight of organic fibers, based on the total weight of the composition. In a specific embodiment, the fiber content is at least 10 wt%, or at least 15 wt%, or at least 20 wt%, or its content is in the following range, based on the total weight of the composition, the lower limit of the ran...

Embodiment

[0068] PP3505G is a propylene homopolymer commercially available from ExxonMobil Chemical Company of Baytown, Texas. According to ASTM D1238, the MFR (2.16kg, 230°C) of PP3505G is 400g / 10min.

[0069] PP7805 is an 80 MFR propylene impact copolymer commercially available from ExxonMobil Chemical Company of Baytown, Texas.

[0070] PP8114 is a 22MFR propylene impact copolymer containing ethylene-propylene rubber and a plastomer commercially available from ExxonMobil Chemical Company of Baytown, Texas.

[0071] PP8224 is a 25MFR propylene impact copolymer containing ethylene-propylene rubber and a plastomer commercially available from ExxonMobil Chemical Company of Baytown, Texas.

[0072] PO1020 is a 430MFR maleic anhydride functionalized polypropylene copolymer containing 0.5-1.0 weight percent maleic anhydride.

[0073] Cimpact CB7 is a surface modified talc, V3837 is a high aspect ratio talc, and Jetfine 700C is a high surface area talc, all available from Luzenac America Inc...

Embodiment 1-6

[0078] * Examples 1-6: The impact results are that the sample does not crack or fragment, and no fragments leave the sample

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Abstract

The present invention is directed generally to processes for making fiber reinforced polypropylene resins including at least 25 wt% polypropylene based polymer, from 5 to 60 wt% organic fiber, and from 0 to 60 wt% inorganic filler. The process includes extrusion compounding the polypropylene based polymer, the organic fiber, and the inorganic filler to form a fiber reinforced polypropylene resin, which is subsequently molded to form an article with a flexural modulus of at least 300,000 psi, that exhibits ductility during instrumented impact testing (15 mph, -29 DEG C, 25 lbs). Twin screw extruder compounding processes where the organic fiber is continuously fed to the extruder hopper by unwinding from one or more spools, and uniformly dispersed in the fiber reinforced polypropylene resin by twin screws having a combination of conveying and kneading elements are also disclosed.

Description

technical field [0001] The present invention generally relates to articles prepared from fiber reinforced polypropylene compositions having a flexural modulus of at least 300,000 psi and exhibiting ductility in an instrumented impact test. The invention also relates to methods of making such articles. It relates more particularly to an advantageous process for the preparation of fiber-reinforced polypropylene composites. Still more specifically, the present invention relates to a method of continuously feeding fibers into a twin screw mixing process and dispersing said fibers uniformly and randomly into a polypropylene matrix Background technique [0002] Polyolefins have limited use in engineering applications due to the trade-off between toughness and stiffness. For example, polyethylene is generally considered to be relatively ductile, but low in stiffness. Polypropylene generally exhibits the opposite tendency, being relatively rigid but having low toughness. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/04B60J5/04B29C45/00C08L23/10
CPCB05D3/144B05D7/53B05D2201/00B05D3/08
Inventor 阿诺德·吕斯蒂热杰弗里·瓦伦塔格
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