Amidino phenyl thiourea as a secondary accelerator for the vulcanisation of natural rubber - polychloroprene blends

Susamma A.P., . and Kuriakose A.P., . and Mini A.M., . Amidino phenyl thiourea as a secondary accelerator for the vulcanisation of natural rubber - polychloroprene blends. pp. 111-123. ISSN 1511-1768

All rubbers have shortcomings in one or more properties. There are therefore technical reasons for blending different elastomers as it makes it possible to obtain the desired compromise in properties. Natural rubber (NR) is a versatile raw material on account of its unique chemical and physical properties. Polychloroprene rubber (CR) is known for its good flame resistance resistance to oil and ozone but is more costly. A blend of NR and CR will make a desirable compromise in the individual properties. Thiourea (TU) and its derivatives are widely used in CR and NR latex vulcanisation. Ethylene thiourea (NA22) the conventional accelerator used in CR vulcanisation is reported to be toxic in nature. We synthesised a thiourea derivative viz. N-amidino-N -phenyl thiourea (APT) which is a non-toxic chemical and attempted the use of APT as a secondary accelerator for the vulcanisation of NR-CR blends. Systems with varying concentrations of APT along with tetramethyl thiuram disulphide (TMTD) and other compounding ingredients were prepared in unfilled and filled systems. TMTD-TU and TMTD-NA22 binary combinations were taken as controls. Different cure characteristics and various physical properties of the experimental and control systems were investigated. Studies showed that APT could be advantageously used as a secondary accelerator along with TMTD. The different vulcanisates prepared with this non-toxic accelerator showed better/comparable tensile and other physical properties compared with the reference formulations.

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Abstract

All rubbers have shortcomings in one or more properties. There are therefore technical reasons for blending different elastomers as it makes it possible to obtain the desired compromise in properties. Natural rubber (NR) is a versatile raw material on account of its unique chemical and physical properties. Polychloroprene rubber (CR) is known for its good flame resistance resistance to oil and ozone but is more costly. A blend of NR and CR will make a desirable compromise in the individual properties. Thiourea (TU) and its derivatives are widely used in CR and NR latex vulcanisation. Ethylene thiourea (NA22) the conventional accelerator used in CR vulcanisation is reported to be toxic in nature. We synthesised a thiourea derivative viz. N-amidino-N -phenyl thiourea (APT) which is a non-toxic chemical and attempted the use of APT as a secondary accelerator for the vulcanisation of NR-CR blends. Systems with varying concentrations of APT along with tetramethyl thiuram disulphide (TMTD) and other compounding ingredients were prepared in unfilled and filled systems. TMTD-TU and TMTD-NA22 binary combinations were taken as controls. Different cure characteristics and various physical properties of the experimental and control systems were investigated. Studies showed that APT could be advantageously used as a secondary accelerator along with TMTD. The different vulcanisates prepared with this non-toxic accelerator showed better/comparable tensile and other physical properties compared with the reference formulations.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Elastomers
AGROVOC Term:	Blending
AGROVOC Term:	Thiourea
AGROVOC Term:	Ethylene
AGROVOC Term:	Synthetic rubber
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/22918

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