Processing and Properties of Liquid Rubbers

1973 ◽  
Vol 46 (1) ◽  
pp. 148-160 ◽  
Author(s):  
R. T. Humpidge ◽  
D. Matthews ◽  
S. H. Morrell ◽  
J. R. Pyne
Keyword(s):  
Carbon Black ◽  
Injection Molding ◽  
Light Weight ◽  
Textile Fibers

Abstract Difficulties of compounding liquid rubbers are discussed and detailed descriptions are given of mixers for the adequate continuous dispersion of carbon black and of light-weight injection molding machines suitable for the pastes which result; some of the problems of injection molding are outlined and suggested solutions given. The reinforcement of liquid rubbers with textile fibers is discussed and suggestions proposed for the layout of a factory suitable for the processing of liquid rubbers.

Effect of Carbon Black Addition on the Rheology Properties of Electrically Conductive PP-Graphite Composite

2011 ◽  
Vol 233-235 ◽  
pp. 3057-3063 ◽  
Author(s):  
Yovial Mahyoedin ◽  
Jaafar Sahari ◽  
Andanastuti Mukhtar ◽  
Norhamidi Mohammad
Keyword(s):  
Activation Energy ◽  
Composite Materials ◽  
Carbon Black ◽  
Injection Molding ◽  
Solid Loading ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Graphite Composite ◽  
Twin Screw ◽  
Varied Composition

This investigation gives attention on the rheology characteristics of polymer composites based on graphite and carbon black as fillers for further processing using an injection molding machine. In such a high solid loading system, the particles exhibit a very strong tendency toward agglomeration. This rapidly increases the viscosity of the mixture and decreases moldability. The presence of agglomerates in the mixture in particular may result in defect within the microstructure in the final product, even though it is sometime necessary in electrical conductivity. Composite materials in this study are polypropylene (PP) as matrix, and graphite (G) and carbon black (CB) as fillers, with a varied composition according to the percentage weight (% wt) of CB. Twin screw co-rotating extruder was used for mixing materials in order to achieve the best homogeneity of this compound. The measurement results obtained using capillary rheometer equipment showed that the addition of CB to the mixture of PP/G increase the viscosity of the materials, increase the activation energy and generally reduce the fluidity of composite materials. The value of the mixture viscosity increases with increasing the number of CB, reducing the ability of materials to be formed (moldability). Material viscosity, activation energy, fluidity and moldability shows how suitable the compound material to be processed by using injection molding machine.

Low Sulfur-Sulfenamide Accelerator Combinations for Injection Molding of Cis-1,4-Poly(Isoprene)

1972 ◽  
Vol 45 (5) ◽  
pp. 1403-1411 ◽  
Author(s):  
J. F. O'Mahoney
Keyword(s):  
Carbon Black ◽  
Injection Molding ◽  
Sulfur Concentration ◽  
Cure Rate ◽  
Tetramethylthiuram Disulfide ◽  
Excellent Method ◽  
Injection Molded ◽  
Low Levels ◽  
Low Sulfur ◽  
Made In

Abstract Earlier work with cis-l,4-poly(isoprene) suggested that low levels of sulfur and high levels of sulfenamide accelerator with high levels of secondary accelerator was an excellent method for curing injection molded stocks. However, subsequent experience showed that despite the benefits of reduced sulfur concentrations on reversion, increased sulfur, increased sulfenamide, and reduced secondary accelerator concentrations were necessary for adequate cure and safety. From that experience we explored further and found that, if the sulfenamide concentration is held constant at a higher level and the secondary accelerator concentration is increased as sulfur concentration is decreased, nearly equivalent hardness and modulus can be maintained throughout most cure conditions with no loss in safety and cure rate and much improvement in reversion resistance. Studies were made in a carbon black filled stock with N-cyclohexyl-2-benzothiazole sulfenamide (CBS), N-oxodiethylene-2-benzothiazole sulfenamide (DBS), and N-morpholinyl-2-benzothiazolyl disulfide (MBD) as primary accelerators and tetramethylthiuram monosulfide (TMTM) and tetramethylthiuram disulfide (TMTD) as secondary accelerators.

Microscopic Evaluation of Commingling-Hybrid Yarns

2007 ◽  
Vol 539-543 ◽  
pp. 992-996 ◽  
Author(s):  
Bok Choon Kang ◽  
K.H. Min ◽  
Y.H. Lee ◽  
Beong Bok Hwang ◽  
Chathura Nalendra Herath
Keyword(s):  
Mechanical Properties ◽  
Characteristic Feature ◽  
Cross Section ◽  
Process Parameters ◽  
Volume Content ◽  
Light Weight ◽  
Textile Fibers ◽  
Hybrid Yarn ◽  
Microscopic Evaluation ◽  
End Products

Fibers made of elements such as carbon, aramid and glass have higher mechanical properties than other conventional textile fibers and they enable the production of light weight composites as end products. Furthermore, commingling hybrid yarns generally have a characteristic feature so that their components are distributed homogeneously enough over the yarn cross section. A normal air texturerising machine was modified to produce commingling hybrid yarns for test samples. Different process parameters were applied to produce the hybridized yarn samples. However, these process parameters turned out to have little effect on the filament distribution over the hybrid yarn cross section in terms of homogeneity. The analysis in this paper is focused on the pattern of mixing of filaments over a cross section of hybrid yarns according to different combinations of reinforcement and matrix filament yarns through microscopic view. The volume content of filament in hybrid yarn cross section was maintained at 50% for both reinforced and matrix, and the hybrid yarns count at 600 tex throughout experiments. It was concluded from the experiments that the diameters of reinforcement and matrix filaments have strong effects on the pattern of mixing of filaments over a cross section of hybrid yarns such that the hybrid yarns with more or less equal diameters of reinforcement and matrix filaments showed considerably even distributions over the hybrid yarn cross section.

scholarly journals Peculiarities of Injection Molding Conducting Composites

2018 ◽  
Vol 248 ◽  
pp. 01006
Author(s):  
Yovial Mahyoedin ◽  
Jaafar Sahari ◽  
Andanastuti Mukhtar ◽  
Norhamidi Mohammad ◽  
Iqbal
Keyword(s):  
Composite Material ◽  
Carbon Black ◽  
Injection Molding ◽  
Test Procedure ◽  
Molded Parts ◽  
Twin Screw ◽  
Probe Test ◽  
Injection Molded ◽  
Conducting Composites

The investigations in this study focused on the characteristic of feedstock in an effort to understand the mechanism of injection molded in composite material. A composite, which has 75% wt. filler, consist of graphite (G), carbon black (CB) and polypropylene copolymer (PP). Twin-screw co-rotating extruder used for mixing materials. The conductivity of the molded parts measured using a four-point probe test procedure. The results showed that the injection molding conducting composites, which aggregated into larger clusters, tended to disperse unevenly into the PP, resulting in fewer particle-particle contacts and, consequently, a lower-conductivity composite in some part of the molded.

scholarly journals Carbon black functionalized stretchable conductive fabrics for wearable heating applications

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19174-19180 ◽  
Author(s):  
Lakshitha R. Pahalagedara ◽  
Induni W. Siriwardane ◽  
Nadeeka D. Tissera ◽  
Ruchira N. Wijesena ◽  
K. M. Nalin de Silva
Keyword(s):  
Carbon Black ◽  
Light Weight ◽  
Wearable Electronics ◽  
Electrically Conductive

There is an increasing interest on robust electrically conductive textiles with light weight and flexibility to meet the applications in wearable electronics.

Melt spinning of conductive textile fibers with hybridized graphite nanoplatelets and carbon black filler

2013 ◽  
Vol 130 (4) ◽  
pp. 2579-2587 ◽  
Author(s):  
Erik Nilsson ◽  
Henrik Oxfall ◽  
Wojciech Wandelt ◽  
Rodney Rychwalski ◽  
Bengt Hagström
Keyword(s):  
Carbon Black ◽  
Melt Spinning ◽  
Graphite Nanoplatelets ◽  
Textile Fibers ◽  
Conductive Textile
Sign in / Sign up

Export Citation Format

Share Document