PILCURE MBTS

Overview
Compounding Information
Application

Chemical Name	2-2'-Dithiobis(benzothiazole) (MBTS)
Chemical Structure
CAS Reg. No.	120-78-5
Mol. Wt.	332
Product Specification
Parameter	Limits	Test Method
Product form	Powder (OT)	-
Color	Cream	-
Assay (titration ) ,% (min)	94.0	D 5051
Free MBT, % (max)	1.0	D 5044
Melting Point (Initial), °C (min)	170.0	D 1519
Melting Point (Final), °C	172-179	D 1519
Heat Loss, % (max)	0.4	D 4571
Ash, % (max)	0.5	D 4574
Paraffinic Oil (<0.2% PCAH), %	1.0-2.0	NOCIL G-40
Residue on 150 µ, % (max)	0.05	D 5461
Residue on 63 µ, % (max)	0.30	D 5461
Typical Data
Specific gravity at 25°C	1.54	D 1817
Bulk density, kg/m3	350 - 390	NOCIL G-44
Bulk density (Comp), kg/m3	420 - 460	NOCIL G-44
Product Information
Solubility	Soluble in chloroform. Slightly soluble in acetone and carbon tetra chloride. Insoluble in water.
Classification	Semi ultra fast accelerator.
Discoloration & Staining	Non-discoloring and Non-staining.
FDA Approval Status	Regulated for use in articles in contact with food under FDA 21 CFR 177.2600, 175.105 and BgVV XXI, Categories 1-4.
Toxicity Data (Please refer to the latest Toxicological information.)	Practically non-harmful. (Oral LD50rat over 5000 mg/kg). Not a skin or eye irritant.
Handling & Personal Protection	Ensure good ventilation and avoid creating dusty atmosphere. In case of eye or skin contacts wash out with clean water for 5 to 10 minutes.
Storage	Store at room temperature in a cool, dry and well ventilated place. Avoid exposure of the packaged material / product to direct sunlight & heat.
Packaging
Paper / Paper – Fabric Bag	20 kg
FIBC	500 kg
Storage Life	36 months
Color code	Red colored strip.

Pilcure MBTS is a semi-ultra fast accelerator for NR, SBR, BR NBR and other highly unsaturated rubbers. It readily disperses in rubber compounds and acts as a retarder for CR based compounds (depending on type of CR used). Pilcure MBTS is a retarder of cure in rubber compounds accelerated using thiurams (TMTM/TMTD) class accelerators as main accelerator and reduces bloom of thiurams to a great extent.

Pilcure MBTS has a long curing range and is safer than Pilcure MBT at rubber compound processing tempera-tures. Pilcure MBTS is very active above curing temperature of 140°C giving flat curing characteristics to 'polyi-soprene' rubbers (e.g. NR). Pilcure MBTS accelerated compounds exhibit very good tensile and resilience properties when used in combination with other booster accelerators.

Normal dosages of Zinc oxide and Stearic acid are necessary for Pilcure MBTS accelerated cure systems. Pilcure MBTS based cure systems can be activated by using small proportions of DOTG, DPG, TMTM, TMTD, ZDC, etc. to improve the rate and the state of cure with a compromise on scorch, reversion and ageing resis-tance particularly when dithiocarbamate boosted accelerator systems are used.

If required, Pilcure MBTS based cure systems can be retarded using Pilgard PVI or other acid retarders. The response of Pilgard PVI to thiazole class accelerators is somewhat sluggish as compared to its effectiveness with sulphenamide class accelerators. Pilcure MBTS can safely be used to produce non-discoloring and non-staining rubber products and is particularly recommended for rubber to metal bonded products.

Pilcure MBTS shows more retarding effect as compared to Pilcure MBT in IIR based compounds (e.g. butyl tubes/extrusions, etc.) and serves as an oxidizing agent for GMF/dibenzo GMF to form nitroso groups for rapid cross linking of diene rubbers. Pilcure MBTS is also used in the compounds based on halogenated butyl rubbers.

Pilcure MBTS dosages are kept below 3.0 phr level to avoid bloom of thiurams/ dithiocarbamates in EPDM based rubber compounds.

Pilcure MBTS / its combinations with booster accelerators are used in NR, SBR, SBR-NR / BR blends, NBR, IIR, EPDM, and other synthetic rubber based compounds used for the manufacture of motor cycles and scooter tyres, butyl tubes, cycle tyre and tubes, beltings, retreading materials, footwear, hot air cured products and miscellaneous molded and extruded products.

TYPICAL DOSAGES OF PILCURE MBTS
Product	Rubber	Accelerator / Sulphur, phr
Product	Rubber	MBTS	MBT	MOR	TMTD	ZDEC	S
Motor Cycle, Scooter Tyre Treads	NR- SBR / BR	1.0-1.2**	-	-	0.1-0.2	-	2.2-2.75*
Auto Tubes	IIR BIIR	0.3-0.4 0.5	-	-	1.0 -	0.0-0.2 0.10	1.5 0.5
Cycle Tyre Treads Casing	NR-RR NR-BR NR	0.8-1.0 1.0-1.2 1.0-1.2**	-	-	0.1-0.2 0.1-0.2 0.2-0.3	-	2.2-2.5 2.2 2.5-3.0
Conveyor Belt Cover	NR SBR	0.80 1.2-1.5	0.2 -	-	0.0-0.15 0.1-0.20	-	2.75* 2.0
Transmission Belts General Purpose Heat Resistant	NR NR	0.3 0.4	-	0.8 -	- 2.0-2.5	-	3.0 0.3
V Belts Base Cushion	NR NR	0.2 0.4	-	0.6 0.6	-	-	3.0 2.4
Retreading Materials Cushion-Hot Cure Cushion-Cold Cure Vulcanizing Solution	NR NR NR	0.2 0.6 1.2	- 0.4 -	0.7** - -	- TMTM-0.2 -	-	2.4* 2.4* 4.0*
Footwear DV Soles Microcellular Soles Neolite Soles	NR-SBR NR-SBR NR-SBR	0.7 0.6 0.7	0.3 - 0.3	-	0.1-0.2 0.1-0.2 0.1-0.2	-	2.2 2.2 2.5
Hot Air Cured Products Rubberized Fabric and Rubber Sheeting	NR	0.4	0.4	-	-	0.3	2.5
Cables	NR SBR	1.0 1.6	-	-	TMTM 0.3	-	1.2 1.0
Misc. Molded and Extruded Products	NR SBR NBR EPDM	0.8-1.0 1.2-1.5 1.2-1.5 3.0	-	-	0.0-0.2 0.0-0.2 0.0-0.2 0.75	ZDBC 1.5	2.4 2.2 1.5 0.5
Pilcure MBTS is also used in following compounds / products Chlorobutyl Inner Liner (Bias Tyres) : MBTS-0.75 + Alkyl phenol disulfide-1.2 + ZnO-5.0 Bromobutyl Inner Liner (Radials): MBTS-1.25 + ZnO-3.0 + S-0.4 Bromobutyl OTR Tubes: MBTS-1.2 + TMTD-1.7 + ZnO-4.0 Bromobutyl Tank Lining: MBTS-1.0 + TMTD-0.5 + ZnO-5.0 + S-0.5
Note: * Insoluble Sulphur (100% active content basis) ** Pre Vulcanization Inhibitor may be incorporated at 0.2-0.5 phr levels for desired scorch safety, ensuring compliance with vulcanizate properties.

Awards / Certifications