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Property Improvement of Glass Fiber & Glass Bubble Filled Polypropylene

IP.com Disclosure Number: IPCOM000245883D
Publication Date: 2016-Apr-15
Document File: 8 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

Polypropylene (PP) composite compositions with Glass Bubbles (GBs) are useful for light weight automotive part manufacturing. Certain PP grades used in the automotive industry have low molecular weight which in turn induces ultrahigh crystallinity and high modulus. Glass fibers (GFs) are known to improve mechanical properties of (PP), such as its impact strength, tensile and flexural strength and modulus. Glass bubbles have been used to reduce the density of glass fiber reinforced PP. However, the addition of GBs into GF reinforced PP typically has a detrimental effect on tensile strength, flexural strength, impact strength, and strain at break. In this study, it is demonstrated that the addition of relatively small amounts of maleic anhydride grafted polypropylene (MAPP) improves all of these properties beyond what can be achieved with these fillers in PP alone. This is especially true when a homopolymer polypropylene with ultra-high crystallinity and low molecular weight is used as the base resin matrix. Recall that the use of MAPP to improve interface mechanical properties has been known for GF/PP and GB/PP composites separately1. In this study, it is reported that the addition of MAPP is substantial in hybrid systems (co-presence of both GB and GF in PP). It is also reported that the addition of MAPP is more influential for ultrahigh crystallinity PP.

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       Property Improvement of Glass Fiber & Glass Bubble Filled Polypropylene Introduction:

Polypropylene (PP) composite compositions with Glass Bubbles (GBs) are useful for light weight automotive part manufacturing. Certain PP grades used in the automotive industry have low molecular weight which in turn induces ultrahigh crystallinity and high modulus. Glass fibers (GFs) are known to improve mechanical properties of (PP), such as its impact strength, tensile and flexural strength and modulus. Glass bubbles have been used to reduce the density of glass fiber reinforced PP. However, the addition of GBs into GF reinforced PP typically has a detrimental effect on tensile strength, flexural strength, impact strength, and strain at break. In this study, it is demonstrated that the addition of relatively small amounts of maleic anhydride grafted polypropylene (MAPP) improves all of these properties beyond what can be achieved with these fillers in PP alone. This is especially true when a homopolymer polypropylene with ultra-high crystallinity and low molecular weight is used as the base resin matrix. Recall that the use of MAPP to improve interface mechanical properties has been known for GF/PP and GB/PP composites separately1. In this study, it is reported that the addition of MAPP is substantial in hybrid systems (co-presence of both GB and GF in PP). It is also reported that the addition of MAPP is more influential for ultrahigh crystallinity PP.

Experimental Results:

Several mixtures of PP, GF and GBs were made varying the amounts of each component. These are compared with a neat formulation of PP and one with a MAPP addition. The tables below show the formulations in weight percentage along with calculated volume percentages and actual measurements of the properties for each mixture.


1. European Patent EP1 709 115 B1


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Formulations (wt%)

                                     0 1 2 3 4 4/MAPP 5 Recipe in Weight % Designation Density in
g/cm3 Weight% Weight% Weight% Weight% Weight% Weight% Weight%

Raw material 1 PP-Homo Albis 0.92 100 80 70 74.8 76 76 75.4 Raw Material 2

GF 2.674 0 20 20 20 20 20 20

Raw Material 3

iM30K 0.6 0 0 10 0 4 4 0

Raw Material 4

iM16K 0.46 0 0 0 5.2 0 0 4.6

Formulations in Calculated Vol%

Vol% Vol% Vol% Vol% Vol% Vol% Vol%

Raw material 1 PP-Homo Albis

100 92 76 81 85 85 82

Raw Material 2

GF

0 8 7 8 8 8 8

Raw Material 3

iM30K

0 0 17 11 7 7 0

Raw Material 4

iM16K

0 0 0 0 0 0 10

Recipe Calculated Density (g/cc)


0.92 1.059 0.998 0.999 1.034 1....