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              1. PILCURE ZDBC
                • Overview
                • Compounding Information
                • Application

                Chemical Name

                Zinc dibutyldithiocarbamate.  (ZnDBC)

                Chemical Structure

                CAS Reg. No.

                136-23-2

                Mol. Wt.

                474

                Product Specification

                Parameter

                                      Limits

                Test Method

                Product form

                Powder

                Powder (OT)

                -

                Color

                White - Off white

                White - Off white

                -

                Assay  ,% (min)

                95.0

                94.0

                NOCIL 02-3-356

                Melting Point, initial, °C (min)

                100.0

                98.0

                D 1519

                Melting point , final , °C

                105-112

                104-112

                D 1519

                Heat Loss, % (max)

                0.50

                0.50

                D 4571

                Water Solubles, % (max)

                0.50

                0.50

                NOCIL 02-3-332

                Zn Content, %

                13.5-15.0

                13.5-15.0

                NOCIL 02-3-323

                Residue on 150 µm sieve, % (max)

                0.20

                0.20

                D 5461

                Residue on 63 µm sieve, % (max)

                0.50

                0.50

                D 5461

                Paraffinic Oil, %

                -

                1.0-2.0

                NOCIL 02-3-343

                Typical Data

                Specific gravity at  25°C

                1.24

                D 1817

                Bulk density , kg/m3

                310 - 350

                NOCIL G-44

                Bulk density (Comp), kg/m3

                420 - 460

                NOCIL G-44

                Product Information

                Solubility

                Soluble in ethylene dichloride, benzene; partly soluble in hexane. Insoluble in dilute alkali 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, 178.2010, 175.300, 177.1210, 177.2600 , under BgVV  XXI, Categories 1-4, and ‘Sonderkategorie’.

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

                Not harmful by mouth. (Oral LD50rat over 5000 mg/kg). 
                May cause slight eye / skin irritation.

                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 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

                Silver Gray strip.

                Pilcure ZDBC is mainly used as a non-blooming, non-staining ultra fast primary accelerator or as a booster accelerator in NR / Synthetic rubber latex compounds and dry rubber compounds for the manufacture of transparent / bright colored bloom free rubber products.

                Pilcure ZDBC as a primary accelerator is very active above 70°C in NR latex compounds and thus is faster than ZDMC or ZDEC as far as latex compounding is concerned. However; in dry     rubber  compounds, Pilcure ZDBC is a slower accelerator as compared to ZDMC / ZDEC at equal dosage due to its higher molecular weight. Like other dithiocarbamate accelerators, Pilcure ZDBC exhibits scorching tendency, faster cure rate and higher crosslink density; however, in combination with thiazoles, Pilcure ZDBC produces bloom free vulcanizates having very good ageing resistance in the presence of antioxidants.

                In NR latex based compounds, Pilcure ZDBC is effective in the absence of Zinc oxide and thus offers excellent transparency to finished products; however, Zinc oxide and Stearic  acid are generally included in dry rubber based  compounds as activators of cure at normal dosages. Pilcure ZDBC disperses easily in latex as well as dry rubber based compounds and does not decompose in the absence of sulphur.

                Pilcure ZDBC is extensively used in sulphur cure systems designed for curing EPDM rubber based compounds at 1.5 to 3.0 phr levels along with other accelerators such as MBT / TMTD / DPTT to manufacture bloom free products.

                Pilcure ZDBC, if required, can be further activated by adding small proportions of dibutyl amine (e.g. for room temperature cure). Pilcure MBTS acts as an effective retarder for Pilcure ZDBC based cure systems without affecting the cure activity at higher curing temperatures.

                Pilcure ZDBC is also used as an effective antioxidant in the manufacture of hot melt adhesives (HMAs),  thermoplastic elastomers (TPEs), unvulcanized rubber cements and adhesives.

                Recommended method for the preparation of 50% dispersion of Pilcure ZDBC for Latex compounding is given below :                                    

                Ingredients

                Dry

                Wet

                Pilcure ZDBC, 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 ZDBC and dry grind for 2 – 3 hr. Add dispersing agent, part quantity of water and grind to paste. Add china clay, balance quantity of water and 10% KOH solution and ball mill for 24 – 48 hr.

                LATEX COMPOUNDING:

                Pilcure ZDBC is  widely used for the  manufacture of NR/SR latex  based products such as Surgical Gloves, Condoms, Latex Threads, Prevulcanized Latex, for transparent goods and heat resistant products, High transparency Teats and rubber bands, NR-latex bonded Sports surfaces, Balloons, etc.
                 

                DRY RUBBER COMPOUNDING:

                Pilcure ZDBC is used in the manufacture of NR / IR based transparent molded products, bright white / bright colored rubber products, Footwear, Cut threads, Transparent tubings, Rubberized fabric, Rubber adhesives and cements, etc. and as a secondary accelerator for the manufacture of bloom-free EPDM and NR-EPDM blend based Molded and Extruded rubber goods.

                 

                TYPICAL DOSAGES:

                Typical dosages of Pilcure ZDBC based cure systems are given below:
                 

                TYPICAL DOSAGES OF PILCURE  ZDBC

                Product

                Rubber

                Accelerator /  Sulphur, phr

                ZDBC

                ZMBT

                TMTD

                DPTT

                TETD

                ETU

                S

                Latex Products :

                Latex Thread:
                General purpose
                Heat resistant

                NR Latex

                 

                0.25
                1.5

                 

                1.5
                1.8

                 

                -
                -

                 

                -
                1.8

                 

                -
                -

                -

                 

                1.7
                -

                Surgical Gloves:
                Disposable
                Sterilizable

                NR Latex

                 

                0.75
                1.0

                 

                -
                -

                 

                -
                0.5

                -

                -

                -

                 

                0.5
                0.25

                Condoms:
                Wet Strip
                Dry Strip

                NR Latex

                 

                0.8
                0.6

                 

                0.8
                1.2

                -

                -

                -

                -

                 

                0.8
                1.0

                PV Lattices:
                Transparent goods
                Heat resistant goods

                NR Latex

                 

                0.5
                1.0

                 

                -
                -

                -

                -

                 

                -
                2.5

                 

                -
                1.0

                 

                1.0
                -

                High transparency teats

                NR Latex

                1.0

                -

                -

                -

                -

                -

                1.0

                Rubber Bands

                NR Latex

                0.75

                -

                -

                -

                -

                -

                0.75

                 

                Transparent Balloons

                NR Latex

                0.75

                -

                -

                -

                -

                -

                0.75

                 

                Latex Bonded Sports- Surface

                NR Latex

                1.5

                1.5

                -

                -

                -

                -

                1.6

                 

                Dry Rubber Products :

                 

                Non blooming Molded and Extruded Goods

                EPDM

                2.0-2.5
                2.0-2.5
                1.0

                -
                1.0
                -

                0.5
                1.5
                2.0

                0.8
                1.0
                0.8

                -
                -
                0.8

                -
                1.0
                -

                2.0
                1.8
                2.0

                 

                NR-EPDM Blend (80:20)

                NR-EPDM

                0.7-1.0

                -

                1.7

                -

                -

                -

                1.2

                 

                Transparent Products

                NR, IR

                0.5-0.7

                -

                -

                -

                -

                -

                1.2-1.5

                 

                Colored Molded Products

                NR
                SBR

                0.6
                0.75

                -

                0.2-0.3
                0.2-0.3

                -
                -

                -

                -

                2.0
                1.8

                 

                Rubberized Fabric

                NR

                0.6

                -

                0.4

                -

                -

                -

                1.8

                 

                Self curing Adhesives /
                Cements
                (Two component system)

                NR

                2.0-4.0

                -

                -

                -

                -

                -

                1.0

                 

                As antioxidant in HMA, TPEs

                -

                0.2-0.3

                -

                -

                -

                -

                -

                -

                 

                As antioxidant in unvulcanized adhesives / solutions

                -

                0.5

                -

                -

                -

                -

                -

                -

                 

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