PREVULCANIZATION OF NATURAL RUBBER LATEX BY UV TECHNIQUES: A PROCESS TOWARDS REDUCING TYPE IV CHEMICAL SENSITIVITY OF LATEX ARTICLES

2010 ◽  
Vol 83 (2) ◽  
pp. 133-148 ◽  
Author(s):  
S. Schlögl ◽  
A. Temel ◽  
R. Schaller ◽  
A. Holzner ◽  
W. Kern
Keyword(s):  
Natural Rubber ◽  
Addition Reaction ◽  
Bond Cleavage ◽  
Natural Rubber Latex ◽  
Innovative Technology ◽  
Cross Linking ◽  
Latex Films ◽  
Photochemical Process ◽  
Sulfur Vulcanization ◽  
Ene Addition

Abstract The UV induced prevulcanization of natural rubber (NR) latex provides an innovative technology for an efficient cross-linking. In the photochemical process, a selected photoinitiator and a poly-functional thiol are added to the NR latex. Free radicals (bond cleavage of the photoinitiator) are generated due to UV irradiation and cross-linking of the latex particles is then achieved by a thiol-ene addition reaction. The thiol-ene addition reaction in NR films is characterized with Fourier transform infrared and Raman spectroscopy. To achieve the prevulcanization of latex, both a thin film photoreactor and a falling film photoreactor are applied. Solid latex films are then produced by conventional dipping of the precured NR latex. The NR latex films are distinguished by good skin compatibility due to the absence of sensitizing or irritating processing agents which are used in conventional sulfur vulcanization. Moreover UV cross-linked films display excellent physical properties as well as high aging stabilities. Further advantages of the new technology compared to conventional sulfur vulcanization are low energy consumption together with short vulcanization times.

scholarly journals Physicochemical, Thermomechanical, and Swelling Properties of Radiation Vulcanised Natural Rubber Latex Film: Effect of Diospyros peregrina Fruit Extracts

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Kazi Md Zakir Hossain ◽  
Nashid Sharif ◽  
N. C. Dafader ◽  
M. E. Haque ◽  
A. M. Sarwaruddin Chowdhury
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Tensile Modulus ◽  
Decomposition Temperature ◽  
Latex Film ◽  
Cross Linking ◽  
Rubber Latex ◽  
Swelling Properties ◽  
Fruit Extracts ◽  
Control Film

A range of radiation vulcanised natural rubber latex (RVNRL) films were prepared using various concentrations of aqueous extracts of mature Diospyros peregrina fruit, which acted as a cross-linking agent. The surface of the RVNRL films exhibited an aggregated morphology of the rubber hydrocarbon with increasing roughness due to increasing fruit extract contents in the latex. An improvement in tensile strength, tensile modulus, and storage modulus of RVNRL films was observed with the addition of fruit extracts compared to the control film due to their cross-linking effect. The glass transition (Tg) temperature of all the RVNRL films was found to be at around −61.5°C. The films were also observed to be thermally stable up to 325°C, while the maximum decomposition temperature appeared at around 375°C. The incorporation of fruit extracts further revealed a significant influence on increasing the crystallinity, gel content, and physical cross-link density of the RVNRL films.

Centrifuging Effect on the Structure and Property of Natural Rubber Latex Films

2003 ◽  
Vol 42 (4) ◽  
pp. 503-514 ◽  
Author(s):  
M. F. Mina ◽  
M. M. Alam ◽  
F. Akhtar ◽  
K. Imaizumi ◽  
S. Yoshida ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Latex Films ◽  
Rubber Latex ◽  
Structure And Property

Preparation and properties of g‐C 3 N 4 on natural rubber latex films

2020 ◽  
Vol 41 (8) ◽  
pp. 3124-3134
Author(s):  
Jing Chen ◽  
Lusheng Liao ◽  
Fuquan Zhang ◽  
Tianming Gao ◽  
Jiazhao Lin ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Latex Films ◽  
Rubber Latex

The Effect of Pre-Vulcanization Temperature on Mechanical and Rheological Properties of Starch Filled Natural Rubber Latex Compounds

2013 ◽  
Vol 858 ◽  
pp. 184-189
Author(s):  
Siti Rohana Yahya ◽  
Farah Nadiah Hamdan ◽  
Azura A. Rashid ◽  
Baharin Azahari
Keyword(s):  
Natural Rubber ◽  
Rheological Properties ◽  
Room Temperature ◽  
Natural Rubber Latex ◽  
Shear Thickening ◽  
Filler Loading ◽  
Latex Films ◽  
Rubber Latex ◽  
Thickening Behavior ◽  
Vulcanization Process

The main objective of this study was to investigate the effect of the pre-vulcanization temperature on mechanical and rheological properties of starch filled natural rubber (NR) latex films. The 10 phr filler loading of starch was added into the latex prior to the pre-vulcanization process at 60°C to 140°C. The dipped films were cured in the oven at 100°C for 20 minutes and cooled at room temperature for 24 hours before stripping. The rheological properties of NR latex compounds were studied based on the viscosity measurement. The tensile and tear tests of starch filled NR latex films were also carried out. The results indicated that the rheological properties of the latex compounds showed shear thickening behavior where viscosity was increased with the increase in shear rate and pre-vulcanization temperature proportionally. The pre-vulcanization temperature at 80°C showed the optimum mechanical properties of starch filled NR latex films.

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