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

-

-

-

-

-

-