Physical decoloration in the concentration process of natural rubber

Rojruthai, Porntip; Pareseecharoen, Chayaporn; Sakdapipanich, Jitladda

doi:10.1002/pls2.10049

Cited by 7 publications

(4 citation statements)

References 10 publications

(15 reference statements)

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“…The color of the rubber films obtained from SRPs was deeper than that from LRPs. This may be attributed to the higher NRC content of SRPs than LRPs, such as protein and ester [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Clones on Relationship between Natural Rubber and Size of Rubber Particles in Latex

Zhang

et al. 2022

IJMS

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IAN873, Dongfang93114 and Reyan73397, created through vegetative propagation for their high yield and excellent cold resistance, are major clones planted in China. In this work, latexes with rubber particles of the same size from these clones are separated from fresh natural rubber latex, and corresponding rubber films are prepared from each latex. The structure and components of each film are measured. This indicates that the characteristics of the rubbers obtained from latexes with similar particle sizes show some resembling trends among different clones, while for specific samples, those characteristics vary depending on the clone. The molecular weight is generally highest in IAN873 and lowest in Reyan73397. Rubber chains in small rubber particles are longer, and large rubber particles show a wider molecular weight distribution. The gel content of every sample from Reyan73397 is lower than the other two clones. The nitrogen content increases with the size of rubber particles in all clones. The ester content of small rubber particles in IAN873 and Reyan73397 is almost zero. Large rubber particles have more branching points formed via esters. This study provides a new perspective on the influence of clones on the relationship between characteristics of natural rubber and the size of rubber particles in natural rubber latex.

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“…The color of the rubber films obtained from SRPs was deeper than that from LRPs. This may be attributed to the higher NRC content of SRPs than LRPs, such as protein and ester [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Clones on Relationship between Natural Rubber and Size of Rubber Particles in Latex

Zhang

et al. 2022

IJMS

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“…The decolorization of NR is minimally affected by treatment with sodium metabisulphite. Given their low nitrogen concentration, deproteinized rubber and saponified rubber are considered suitable methods for producing light-colored NR [47,48]. Therefore, this study aimed to focus on the development of DNRL preparations that result in light-colored rubber films.…”

Section: Discussionmentioning

confidence: 99%

Deproteinization of Natural Rubber Latex and Its Pale-Colored Thin Films

Suksaeree,

Bumroongrat,

Polraksa

et al. 2023

Sustainability

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The non-rubber components present in natural rubber latex can contribute to the dark color of dried films and may cause allergic reactions. This project aimed to develop light-color rubber films with minimal protein contamination. Various additives were incorporated, and a leaching procedure was implemented to address this issue. The evaluation focused on protein content, color changes, and swelling properties of thin natural rubber films. Texapon N70 proved effective as both a latex stabilizer and leaching agent, while Uniphen P-23 served as a preservative. The combined use of these additives facilitated the removal of soluble serum through appropriate incubation, leaching, and centrifugation processes. The introduction of additional centrifugation cycles improved deproteinization and color reduction; however, it led to a loss of rubber mass and an increase in manufacturing costs. Increasing the amount of Texapon N70 and introducing alkali potassium hydroxide (KOH) further enhanced the efficiency of deproteinization and color reduction. The optimal conditions determined in this investigation were as follows: 0.5% w/w Texapon N70, 0.5% w/w KOH, 1% w/w Uniphen P-23, a 60-min incubation period, and a single leaching cycle with distilled water. These conditions resulted in a 90.57 ± 1.20% decrease in protein contamination and a color change (ΔE) of 433.69 ± 20.23. This successful condition can be replicated and scaled up for further applications.

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“…Mostly, the non-rubber components affect the color of products made from it. Therefore, the color change of the samples is likely to arise from the oxidation of non-rubbers such as proteins and lipids [19].…”

Section: Characterization Of Fresh Natural Latexmentioning

confidence: 99%

Influence of Non-Rubber Components on the Properties of Unvulcanized Natural Rubber from Different Clones

et al. 2022

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Natural rubber from different Hevea braziliensis clones, namely RRIM600, RRIT251, PB235 and BPM24, exhibit unique properties. The influences of the various fresh natural rubber latex and cream concentrated latex on the non-rubber components related properties were studied. It was found that the fresh natural rubber latex exhibited differences in their particle size, which was attributed to the non-rubber and unique signature of clones which affect various properties. Meanwhile, the cream concentrated latex showed the protein contents, surface tension, and color of creamed latex to be lower than the fresh natural latex. However, TSC, DRC, viscosity, particle size and green strength of concentrated latex were found to be higher than the fresh natural latex. This is attributed to the incorporation of HEC molecules. Also, the rubber particle size distribution in the RRIM600 clone exhibited a large particle size and uniform distribution, showing good mechanical properties when compared to the other clones. Furthermore, the increased green strength in the RRIM600 clone can be attributed to the crystallization of the chain on straining and chain entanglement. These experimental results may provide benefits for manufacturing rubber products, which can be selected from a suitable clone.

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Physical decoloration in the concentration process of natural rubber

Cited by 7 publications

References 10 publications

Influence of Clones on Relationship between Natural Rubber and Size of Rubber Particles in Latex

Influence of Clones on Relationship between Natural Rubber and Size of Rubber Particles in Latex

Deproteinization of Natural Rubber Latex and Its Pale-Colored Thin Films

Influence of Non-Rubber Components on the Properties of Unvulcanized Natural Rubber from Different Clones

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