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              1. PILCURE MOR
                • Overview
                • Compounding Information
                • Application

                Chemical Name

                2-(4-Morpholinothio) benzothiazole (MBS)

                Chemical Structure

                CAS Reg. No.

                102-77-2

                Mol. Wt.

                252

                Product Specification

                Parameter

                Limits

                Test Method

                Product form

                Pellets (2mm)

                -

                Color

                Off white to light buff

                -

                Assay (titration ) ,% (min)

                97.0

                D 4936

                Melting point , final , °C

                82-88

                D 1519

                Heat Loss, % (max)

                0.3

                D 4571

                Ash, % (max)

                0.3

                D 4574

                Methanol Insolubles, % (max)

                0.3

                D 4934

                Free Amine, % (max)

                0.3

                D 4936

                Typical Data

                Specific gravity at  25°C

                1.36

                D 1817

                Bulk density , kg/m3

                540 - 580

                NOCIL G-44

                Bulk density (Comp), kg/m3

                550 -590

                NOCIL G-44

                Product Information                       

                Solubility

                Soluble in acetone, benzene & chloroform. Partially soluble methyl alcohol. Insoluble in water.

                Classification

                Fast – Delayed action accelerator.

                Discoloration & Staining

                Non staining. At higher dosages slight discoloration.

                FDA Approval Status

                Regulated for use in articles in contact with food under FDA 21 CFR 177.2600, and BgVV  XXI, Category 4.

                Toxicity Data
                (Please refer to the latest
                Toxicological information.)

                Practically non-harmful. (Oral LD 50 rat over 5000 mg/kg). Not a skin or eye irritant. To minimize the possibility of nitrosamines generation; morpholine   based chemicals are avoided with nitrosating agents.

                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

                Always store in a cool (below 30ºC) & dry place in single stack pallets away from direct sun light or any other heat source to avoid compaction. Avoid exposure to acids, acidic materials / atmosphere & high humidity.

                Packaging

                Paper –Fabric Bag

                20 kg

                FIBC

                500 kg

                Storage Life

                12 months when stored as stated above.

                Color code

                Dark Yellow colored strip

                Pilcure MOR is a delayed action sulphenamide accelerator for NR, NR-BR blends, NR-SBR blends and other highly unsaturated synthetic rubber based compounds reinforced with fine particle size furnace blacks prone to excessive heat generation during processing operations. Pilcure MOR pellets exhibit good storage stability and disperse easily in rubber compounds due to comparatively lower melting range of Pilcure MOR.

                Normal dosages of Zinc oxide and Stearic acid are necessary for cure activation of compounds based on Pilcure MOR. Pilcure MOR is used at 0.5-1.0 phr dosage for conventional cure systems, at 1.5 to 2.0 phr dosage for Semi-EV cures and at 3.0 and above for low sulphur EV cures.

                Pilcure MOR is very active above 140°C and offers longer scorch delay; particularly during high temperature processing operations (e.g.extrusion/ calendaring, etc.) as compared to Pilcure CBS or Pilcure NS for tyre treads or similar high performance rubber compounds.    

                The rubber compounds based on Pilcure MOR exhibit excellent shelf life and retention of cure activity on prolonged storage as compared to other sulphenamide accelerators.  At curing temperatures Pilcure MOR exhibits delayed on- set of cure along with faster cure rate and a very good plateau effect. The crosslink density obtained by using Pilcure MOR is approximately 6-8% lower than Pilcure CBS and 12 to 15% lower than Pilcure NS when compared at equal dosages of  these sulphenamide class accelerators. Progressive increase in Pilcure MOR dosage, like other sulphenamide accelerators, shows improvements in scorch delay, cure rate and state of cure. The vulcanizates based on Pilcure MOR exhibit higher modulus, excellent elastic properties under dynamic conditions and lower heat buildup  under dynamic stress. Semi-EV cure systems based on Pilcure MOR offer improved heat and ageing resistance.

                Pilcure MOR is usually incorporated in the rubber compounds at the end of the mixing cycle. In case Pilcure MOR is to be added at a  later stage it is sufficient to ensure  that the rubber compound is warmed to 80-85°C for achieving excellent dispersion and dissolution of Pilcure MOR.

                Pilcure MOR is a sulphenamide accelerator based on secondary amine (Morpholine) and hence is extremely sensitive to booster accelerators like DPG, DOTG, TMTM, and ZDC as as well as pre vulcanization inhibitor Pilgard PVI (CTP). Thus, when booster accelerators are required for further activation or Pilgard PVI is required for further scorch delay; very small dosages can produce desired response. Pilcure   MBT (used in small dosages) also activates the rate of cure; however, thiuram accelerators TMTM / TMTD and dithiocarbamates are generally preferred as booster accelerators for achieving desired vulcanizate properties.

                Like other sulphenamide accelerators, Pilcure MOR also decomposes rapidly in the presence of hot steam and can be used for the manufacture of open steam cured products requiring faster onset of cure; however, similar advantage is not offered for hot air cured products in the absence of strong booster accelerators. Pilcure MOR is an excellent accelerator for EPDM cures where long scorch delay and faster cure rate is desired. A cure system of Pilcure MOR 3.5 phr and Sulphur 1.5 phr may be used for curing products like dock fenders where long scorch delay, excellent stock shelf life and faster cures are needed.

                Pilcure MOR is the most effective retarder for thiuram based EV-cures. Incorporation of Pilcure MOR reduces the blooming tendency of the thiuram cured vulcanizates and contributes to improvements in the state cure if sulphur is incorporated at small dosage.

                Pilcure MOR based vulcanizates have a typical amine  odor & bitter taste and hence Pilcure MOR is generally avoided for the manufacture of rubber goods intended for repeated contact with food / drugs.

                Pilcure MOR alone or in combination with small quantities of booster accelerator is widely used in NR, SBR, NR-BR/SBR blends, NBR and other synthetic rubber based compounds  used for the manufacture of auto tyres, tyre retreading materials, conveyor and power transmission beltings, rubber goods with thick cross sections, intricately shaped rubber goods, rubber footwear, injection molded goods, cables and other miscellaneous molded and extruded rubber products.

                Typical dosage of Pilcure MOR based accelerator systems are given below:

                Product

                Rubber

                Accelerators / Sulphur, phr.

                MBS

                MBTS

                TMTD

                PVI
                (CTP)

                S

                Truck & Bus Tyres -   Tread
                Sidewall
                Casing

                NR-BR
                NR-BR
                NR-SBR

                1.1-1.2
                0.9-1.0
                0.8-1.2

                -
                -
                -

                -
                -
                -

                0.15-0.20
                0.15-0.20
                0.15-0.20

                1.5-1.6*
                1.8-2.0*
                2.0-2.4*

                Conveyor Belt Cover
                General Purpose
                Heat Resistant


                NR
                NR-SBR


                0.6-0.8
                1.5


                0.1-0.3
                -


                -
                0.5


                0.10-0.20
                0.15-0.20


                2.3-2.5
                0.5-0.7

                V Belts  Base
                Cushion
                Friction

                NR
                NR
                NR

                0.5
                0.5
                0.6

                0.2
                0.2
                0.2

                -
                -
                -

                0.10-0.20
                0.15-0.20
                0.15-0.20

                3.0
                2.4
                2.75

                Retreads  Hot Cure

                Pre Cured

                NR
                NR-BR
                NR-BR

                0.5
                0.8
                1.0

                -
                -
                0.2

                -
                -
                -

                0.15
                0.15
                0.10

                2.4*
                2.0*
                1.6

                Footwear             DV Soles
                Molded Soles & Heels

                NR-SBR
                NR-SBR

                0.8
                0.8

                0.4
                -

                0.1
                0.2

                0.10
                0.10

                2.0
                2.2

                Injection Moldings

                NR

                0.7

                -

                -

                0.25

                2.4

                Molded & Extruded Goods

                NR
                NR-SeEV
                NR-EV

                SBR
                SBR-SeEV
                SBR-EV

                NBR
                NBR-SeEV
                NBR-EV

                0.7-0.8
                1.5-2.0
                2.5-3.0

                1.0-1.2
                1.5-2.5
                1.5

                1.0-1.2
                1.5-1.2
                2.0

                0.1
                -
                -

                0.2
                -
                -

                0.2
                -
                -

                0.0-0.2
                0.3-0.5
                0.5-0.6

                0.1-0.2
                0.5
                2.5-3.5

                0.1-0.2
                0.5-0.7
                3.0-4.0

                0.10-0.20
                0.10-0.20
                -

                -
                -
                -

                -
                -
                -

                2.2-2.5
                0.8-1.0
                0.3-0.5

                2.0-2.2
                0.7-1.0
                0.3-0.5

                1.5
                0.75
                0.3

                Note:   *   Insoluble Sulphur (100% active content basis)          

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