The Method to Produce Light-Color Natural Rubber

Hathaichanok Boonyang; Jitladda Sakdapipanich

doi:10.4028/www.scientific.net/AMR.844.85

Paper Titles

Changes in Mixing Torque, Mechanical and Dynamic Rheological Properties of Epoxidized Natural Rubber and Copolyester Blends as Affected by Epoxidized Natural Rubber Contents
p.69

Water Absorption and Swelling Property of Interpenetrating Network Hydrogel from Crosslinked Natural Rubber and Modified Rice Starch
p.73

Thermal and Mechanical Properties of Natural Rubber/Rice Starch Interpenetrating Network Hydrogel
p.77

Influence of Curing Systems on Mechanical, Dynamic, and Morphological Properties of Dynamically Cured Epoxidized Natural Rubber/ Copolyamide Blends
p.81

The Method to Produce Light-Color Natural Rubber
p.85

Thermoplastic Natural Rubber of Co-Polyamide: Effect of Blend Ratios on Mechanical, Swelling, Dynamic and Morphological Properties
p.89

Influence of Blend Proportions on Properties of ENR-25/TPU Simple Blends
p.93

Dynamic Mechanical and Dielectric Properties of Poly(vinylidene fluoride) and Epoxidized Natural Rubber Blends
p.97

Role of Gel Content on the Structural Changes of Masticated Natural Rubber
p.101

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 844The Method to Produce Light-Color Natural Rubber

The Method to Produce Light-Color Natural Rubber

Abstract:

It is known that natural rubber (NR) has a naturally occurring color, which restricts to some applications of NR, especially for producing light-colored NR products. Thus, this present work was an attempt to find the appropriate method for promoting the light color NR. First, the color substances in NR were extracted by a certain method and subjected to analysis by Thin layer chromatography (TLC). They were separated by hexane/diethyl ether (7:3 v/v). The separation was detected using 3% cupric acetate in 8% phosphoric acid (H₃PO₄) and heated at 180 degree C. It was found that the color extracts from NR comprise of various compounds such as carotenoids, free fatty acids, tocotrienols, oxidized proteins, etc. Developments of light color NR were carried out by the addition of enzymatic browning inhibitors, i.e., sodium metabisulphite (SMS) in latex and the employment of some chemicals, i.e., proteolytic enzyme, sodium hydroxide, to discolor the rubber. It was found that the color index of NaOH-treated rubber or saponified rubber (SP) was lightest, whereas the color of urea-treated rubber or deproteinized rubber (DP) was close to the centrifugation rubber. The treatment of SMS showed an insignificant effect on the decoloring of NR. DP and SP showed very low nitrogen content, so these may be effective methods to produce light-color NR.

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Periodical:

Advanced Materials Research (Volume 844)

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85-88

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.844.85

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Online since:

November 2013

Authors:

Hathaichanok Boonyang, Jitladda Sakdapipanich

Keywords:

Decolorization, Light-Color NR

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