Effects of silane on properties of silica filled natural rubber compounds

Ansarifar M. A., . and Nijhawan R., . Effects of silane on properties of silica filled natural rubber compounds. pp. 169-184. ISSN 1511-1768

The Mooney viscosity and cure properties of some conventional accelerator/sulphur compounds of natural rubber containing respectively 10 30 or 60 parts per hundred rubber by weight (p.p.h.r.) precipitated amorphous white silica were measured. The compounds also contained no silane and different amounts of bis3-triethoxysilylpropyl-) tertrasulphane bifunctional organosilane. The viscosities of the compounds with 60 p.p.h.r. and 30 p.p.h.r. silica reduced substantially when 7 p.p.h.r. and 1.5 p.p.h.r. silane were added respectively. The viscosity of the mix with 10 p.p.h.r. silica decreased only slightly as the dosage of silane was raised to 5 p.p.h.r. The shortest optimum cure times t95 for the mixes with 60 p.p.h.r. and 30 p.p.h.r. silica were recorded when 7 p.p.h.r. and 4 p.p.h.r. silane were added respectively whereas the cure time of the compound with 10 p.p.h.r. silica was little affected by the addition of up to 5 p.p.h.r. silane. The cure rate of the mixes with 60 p.p.h.r. and 30 p.p.h.r. silica calculated from the cure rate index accelerated significantly when 7 p.p.h.r. and 4 p.p.h.r. silane were added respectively. Interestingly the cure rate of the mix with 10 p.p.h.r. silica slowed down greatly as a result of introducing up to 5 p.p.h.r. silane.

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Abstract

The Mooney viscosity and cure properties of some conventional accelerator/sulphur compounds of natural rubber containing respectively 10 30 or 60 parts per hundred rubber by weight (p.p.h.r.) precipitated amorphous white silica were measured. The compounds also contained no silane and different amounts of bis3-triethoxysilylpropyl-) tertrasulphane bifunctional organosilane. The viscosities of the compounds with 60 p.p.h.r. and 30 p.p.h.r. silica reduced substantially when 7 p.p.h.r. and 1.5 p.p.h.r. silane were added respectively. The viscosity of the mix with 10 p.p.h.r. silica decreased only slightly as the dosage of silane was raised to 5 p.p.h.r. The shortest optimum cure times t95 for the mixes with 60 p.p.h.r. and 30 p.p.h.r. silica were recorded when 7 p.p.h.r. and 4 p.p.h.r. silane were added respectively whereas the cure time of the compound with 10 p.p.h.r. silica was little affected by the addition of up to 5 p.p.h.r. silane. The cure rate of the mixes with 60 p.p.h.r. and 30 p.p.h.r. silica calculated from the cure rate index accelerated significantly when 7 p.p.h.r. and 4 p.p.h.r. silane were added respectively. Interestingly the cure rate of the mix with 10 p.p.h.r. silica slowed down greatly as a result of introducing up to 5 p.p.h.r. silane.

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Item Type:	Article
AGROVOC Term:	Silica
AGROVOC Term:	Natural rubber
AGROVOC Term:	Viscosity
AGROVOC Term:	Sulphur
AGROVOC Term:	Polymers
AGROVOC Term:	Elastomers
AGROVOC Term:	Zinc
AGROVOC Term:	Stearic acid
AGROVOC Term:	Electronics
AGROVOC Term:	Formulations
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23218

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