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              1. PILCURE ZDC
                • Overview
                • Compounding Information
                • Application

                Chemical Name

                Zinc diethyldithiocarbamate (ZnDEC)

                Chemical Structure

                CAS Reg. No.

                14324-55-1

                Mol. Wt.

                362

                Product Information

                Parameter

                Limits

                Test Method

                Product form

                Powder

                Color

                White-Off white

                Assay  ,% (min)

                96.0

                NOCIL 02-3-356

                Melting Point, initial, °C (min)

                173

                D 1519

                Melting point , final , °C (min)

                176

                D 1519

                Heat Loss, % (max)

                0.3

                D 4571

                Zn Content, %

                17.5-18.5

                NOCIL 02-3-323

                Residue on 150 µm sieve, % (max)

                0.10

                D 5461

                Residue on 63 µm sieve, % (max)

                0.30

                D 5461

                Typical Data

                Specific gravity at  25°C

                1.45

                D 1817

                Bulk density , kg/m3

                380 - 420

                NOCIL G-44

                Bulk density (Comp), kg/m3

                520 - 560

                NOCIL G-44

                Product Information

                Solubility

                Soluble in methylene chloride, benzene; partly soluble in acetone and carbon tetrachloride and insoluble in alcohol and water.

                Classification

                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 175.105,177.2600,and BgVV XXI, Categories1-4, & ‘Sonderkategorie’.

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

                Slightly harmful by mouth. (Oral LD50rat over 2000 mg / kg). Not a skin sensitizer.Can cause alcohol intolerance.

                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. If swallowed, seek  medical advice

                Storage

                Always store in a cool (below 35ºC) & dry place in single stack pallets away from direct sun light or any other heat source to avoid grit formation.

                Packaging

                Paper-Fabric  Bag

                20 kg

                FIBC

                -

                Storage Life

                24 months

                Color code

                Navy Blue colored strip.

                Pilcure ZDC is a widely used ultra fast accelerator for NR latex based compounds and also finds applications as primary or secondary accelerator in most dry rubber based sulphur cured compounds.

                Pilcure ZDC is  very active at temperatures above 100°C. As a  primary accelerator in NR dry rubber based compounds. Pilcure ZDC exhibits scorching tendency, faster cure rate, higher cross link density but poor reversion resistance. However; Pilcure ZDC does not affect the stability of NR latex based compounds.

                Normal dosages of Zinc oxide and Stearic acid are necessary as cure activators for Pilcure ZDC based cure systems designed for diene rubbers. Pilcure ZDC disperses well in latex / dry rubber based compounds and does not decompose in the absence of sulphur. It may be noted that the vulcanizates cured with all types of dithiocarbamate accelerators may exhibit poor ageing properties in the absence of antioxidants / antidegradants.

                Low unsaturation content rubbers such as Butyl rubber and EPDM can be cured using Pilcure ZDC as a secondary accelerator at relatively higher dosage along with Thiuram class primary accelerators. The thiazole class accelerators act as cure rate modifiers in such compounds.

                Highly basic accelerators / amines further activate the cure rate of Pilcure ZDC based cure systems which are used for the manufacture of self curing adhesives. However, in dry rubber compounds Pilcure ZDC is mainly used as a booster accelerator and offers typical synergistic effect with thiazole class accelerators. In case of sulphenamide based cure systems, Pilcure ZDC is a very active booster accelerator and even very small dosages are highly responsive. Accelerators such as Pilcure MBTS, Pilcure TMT at 0.05 - 0.1phr dosages act as retarders where Pilcure ZDC is used as primary accelerator.

                Pilcure ZDC has a limited solubility in rubber compounds and hence excess quantity of Pilcure ZDC tends to bloom on the surface of the vulcanizate. (The ‘bloom’ of thiuram class accelerators is accelerator ZDC itself, since thiuram accelerator is converted to ZDMC during the vulcanization in the presence of Zinc oxide.)

                Pilcure ZDC is non- staining and non-discoloring even on exposure to light and is suitable for the manufacture of transparent goods; however, Pilcure ZDBC is the most preferred accelerator for this purpose. Vulcanizates based on Pilcure ZDC / Pilcure TMT can be used for food contact applications subject to a maximum 1.2% by weight of the finished product. (It may be noted that FDA Rules & Regulations are subject to change and seeking clarifications from relevant authorities is recommended before commercial manufacture of rubber products).

                Recommended method for preparation of 50% dispersion of Pilcure ZDC for latex compounding is given below :


                Ingredients

                Dry

                Wet

                Pilcure ZDC, pbw

                50

                50

                10% Dispersing Agent *, pbw

                1.0

                10

                10% KOH Solution, pbw

                0.5

                5

                China Clay, pbw

                0.5

                0.5

                Water, pbw

                -

                34.5

                Total

                52

                100

                * Sodium salt of polymerized alkyl naphthalene sulfonic acid type.

                 

                METHOD:

                Charge Pilcure ZDC, dispersing agent and part quantity of water and grind to paste. Add china clay, balance quantity of water , 10% KOH solution and ball mill for 24 to 48 hr.depending on the requirements of the rubber product to be manufactured

                LATEX COMPOUNDING:

                Pilcure ZDC is widely used for the manufacture of NR/SR latex based products such as Latex Foam, Coir Foam, Latex Threads, Latex Tubings, Prevulcanized lattices, Surgical Gloves, Household and Industrial gloves, Condoms, Teats, Toy balloons, Rubber bands, Carpet backings, Latex adhesives, etc.

                 

                DRY RUBBER COMPOUNDING:

                Pilcure ZDC alone is used in the manufacture of white / colored rubber products such as Footwear components, Seals, Gaskets, Bathing caps, Hoses, Beltings, Cut threads, Sponges, Expanded rubbers, Rubberized fabrics, Rubber Sheeting, Stereo rubbers, Food contact applications, etc.

                 

                TYPICAL DOSAGES:

                Typical dosages of Pilcure ZDC used in latex compounding, please refer the table given for Pilcure ZMBT. Additional applications of Pilcure ZDC in latex compounding as well as in dry rubber compounding are given below. (Accelerator and Sulphur dosages are on ‘dry’ basis).

                TYPICAL DOSAGES OF PILCURE ZDC

                Product

                Rubber

                Accelerator /  Sulphur, phr

                ZDC

                ZMBT

                MBT

                TMTD

                CBS

                S

                Latex Products :

                Surgical Gloves
                Electrician’s Gloves
                Household Gloves
                Latex Foam
                Coir Foam
                Latex Thread
                Misc. dipped goods
                Latex Adhesives
                Carpet backings
                Toy Balloons

                NR Latex

                0.7
                1.5
                1.0
                1.0
                1.0
                0.5
                1.0
                1.0
                1.5
                0.6

                0.2
                -
                -
                1.0
                1.0
                1.0
                0.2
                -
                1.5
                -

                -
                -
                -
                -
                -
                -
                -
                -
                -
                -

                -
                -
                -
                -
                -
                -
                -
                -
                -
                -

                -
                -
                -
                -
                -
                -
                -
                -
                -
                -

                1.0
                1.25
                1.25
                2.0
                2.0
                1.8
                1.0-1.2
                -
                2.0
                0.7

                PV Lattices :
                Low Modulus
                Medium Modulus
                High Modulus

                NR Latex

                 

                0.25
                0.5
                1.0

                 

                -
                -
                -

                 

                -
                -
                -

                 

                -
                -
                -

                 

                -
                -
                -

                 

                0.25
                1.0
                2.0

                Cast Products

                NR Latex

                1.0-1.5

                -

                -

                -

                -

                1.5-2.5

                Latex Tubing

                NR Latex

                1.2

                0.2

                -

                -

                -

                1.0

                Dry Rubber Products:

                Food Applications

                NR
                SBR

                0.3
                0.5

                -
                -

                -
                -

                0.1
                0.2

                -
                -

                2.0
                1.5

                Colored Molded Products

                NR
                SBR

                0.5
                0.7

                0.2
                0.3

                -
                -

                -
                -

                -
                -

                2.0
                1.7

                Molded & Extruded
                Products

                EPDM
                BUTYL

                0.75
                0.5-1.0

                -
                -

                0.5
                0.5

                1.5
                1.5-2.0

                -
                -

                1.5
                2.0

                Cables

                NR, SBR

                1.0

                -

                0.7

                -

                0.7

                1.0

                Hot Air Cured Products

                NR, SBR

                0.7

                -

                0.5

                -

                -

                1.5

                Steam Cured Products

                NR, SBR

                0.15

                -

                -

                -

                1.0

                1.25

                Stereo Rubbers

                NR

                0.25

                -

                -

                -

                1.5

                1.5

                Sponge Rubber

                NR

                1.0

                -

                0.25

                -

                -

                1.2

                LCM Cured Products

                NR

                0.4

                -

                0.20

                -

                1.5

                1.2

                NR-EPDM Blends(80:20)

                NR-EPDM

                0.6

                -

                1.7

                -

                -

                1.8

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