Disulfide Silane Coupling Agent Crosile® 75 for Tyre Rubber Industry

Crosile® 75 (Bis(3-triethoxysilylpropyl)disulfide) TESPD is a Disulfide Silane Coupling Agent, polysulfidic organosilane and has been widely in the rubber industry. Crosile® 75 Silane coupling agent is used to improve the reinforcing capability of fillers with silanol group on their surface,and also as an integral part of curing systems to improve cross-linking network properties.

Item NO.:
Crosile® 75
Chemical Name:
Bis(3-triethoxysilylpropyl)disulfane
Chemical Formula:
C18H42O6S4Si2
CAS No.:
56706-10-6
EINECS No:
260-350-7
Properties:
Crosile®75 is a pale-yellow clear liquid with light odor of ethyl alcohol and soluble easily in ethyl alcohol, acetone, benzene, toluene etc. It is unsoluble in water.

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Disulfide Silane Coupling Agent Crosile® 75 for Tyre Rubber Industry

Bifunctional sulfur-containing organosilane that boosts filler reinforcement and builds an effective crosslinking network.

Product Description

Crosile® 75 (TESPD) is a bifunctional sulfur-containing organosilane widely used in the rubber industry. It improves the reinforcing efficiency of fillers containing silanol groups on their surfaces and also participates in the vulcanization system, contributing to the development of an effective crosslinking network.

Chemical Identity

Chemical Name: Bis [3-(triethoxysilyl)propyl] disulfide
CAS Number: 56706-10-6
Molecular Formula: (C2H5O)3SiCH2CH2CH2-S2-CH2CH2CH2Si(OC2H5)3
Synonyms: BIS(TRIETHOXYSILYLPROPYL)DISULFIDE, Bis(3-triethoxysilylpropyl)disulfane, BIS[3-(TRIETHOXYSILYL) PROPYL]-DISULFIDE, Bis[3-(triethoxysilyl)propyl] persulfide, 3,3′-Bis-(triethoxysilylpropyl) disulfide, Bis[3-(triethoxysilyl)propyl] perdisulfide, bis[γ-(triethoxysilyl-propyl]-disulfide, Bis-(γ-triethoxysilylpropyl)-disulfide

Molecular Mechanism

Crosile® 75 is a bifunctional sulfur-containing organosilane that improves the reinforcing efficiency of fillers whose surfaces carry silanol groups, coupling them into the polymer matrix. It also participates in the vulcanization system, where its disulfide functionality contributes to the development of an effective crosslinking network.

Key Features

Filler Reinforcement

Improves the reinforcing efficiency of fillers containing silanol groups on their surfaces.

Thermal Stability

Compared with Crosile® 69 (TESPT), Crosile® 75 exhibits higher thermal stability, allowing higher processing and mixing temperatures.

Crosslinking Network

Participates in the vulcanization system, contributing to the development of an effective crosslinking network.

Bifunctional Sulfur Silane

Crosile® 75 (TESPD) is a bifunctional, sulfur-containing organosilane widely used across the rubber industry.

Performance Improvement

Mechanical Properties: Significantly improves tensile strength, tear strength, and abrasion resistance, enhances modulus, and reduces compression set.

Processability: Helps lower compound viscosity and improve the processability of rubber compounds.

Dynamic Performance: Contributes to enhanced dynamic performance of rubber compounds.

Technical Specifications

Properties	Units	Target Values (Spec,Limits)
Alcohol content	%(wt)	≤0.5%
γ2 Content	%(wt)	≤3.0%
Other impurity content	%(wt)	≤1.0%
Viscosity 25°C (cps)	Cps	≤14.0
Sulfur Content	%(wt)	15.0 ± 1.0
S2 content	%(wt)	80-90
S4-S8 content	%(wt)	10.00%
The average sulfur chain	2.20±0.15
Other Impurity Content	%(wt)	Max 4.0
Specific Gravity (25°C)	g/cm3	1.080 ± 0.020
Refractive Index (25°C)		1.480 ± 0.020

Application Scenarios

Vulcanizate Performance

Crosile® 75 is a multifunctional silane coupling agent that improves the physical and mechanical properties of vulcanizates, significantly improving tensile strength, tear strength, and abrasion resistance while reducing compression set.

Filler Reinforcement

Enhances the reinforcing efficiency of fillers containing hydroxyl groups in unsaturated elastomers and their blends. Silica, talc, mica, and clay can be used in combination with Crosile® 75.

Polymer Compatibility

Compatible with unsaturated elastomers including NR, IR, SBR, BR, NBR, and EPDM, and their blends.

Usage Guidelines

Recommended dosage: 1.0-4.0 PHR

Packaging And Transportation

Packing: 25 kg/drum (16 MT/20 FCL with pallet); 200 kg/drum (16 MT/20 FCL with pallet); 1060 kg in IBC drum (21.2 MT/20 FCL with pallet)
Storage: Store in cool, dry, ventilated area away from direct sunlight.
Shelf life: 12 months in ventilated, cool, dry conditions.

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