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Ultra-accelerator for natural and synthetic rubbers and their latices |
Behaviour in Vulcanization
NAFTOCIT Di 7 is an ultra-accelerator, used either alone or as a secondary accelerator for the fast vulcanizing of natural and synthetic latex and also solid rubber types such as NR, SBR, EPDM, IIR, IR and NBR.
NAFTOCIT Di 7 is also an activator for accelerators of the Thiuram (TMT), mercapto (MBT) or sulphenamide (CBS) classes. Basic accelerators, however, have an activating effect on NAFTOCIT Di 7.
Very rapid and efficient combinations can be obtained in conjunction with other ultra-accelerators of the dithiocarbamate group, such as NAFTOCIT Di 4 or NAFTOCIT Di 13.
Latex mixtures with NAFTOCIT Di 7 display safe and reliabie curing results and have good shelf life as well as a broad plateau effect in vulcanization.
NAFTOCIT Di 7 as a sole accelerator in latex mixtures also produces no thickening, even over prolonged storage periods, no discoloration and no offensive taste or odour in the vulcanizates.
As a combination accelerator NAFTOCIT Di 7 is particulariy effective in solid rubber compounds.
Typical fields of application
White and light-coloured latex goods such as carpet backings, foam rubber or latex, dipped products, etc.; rubber threads, rubberized textiles; soft rubber products such as bathing caps, bath mats; physiologically harmless (non-toxic) rubber goods; footwear, transparent rubber soles and heels; as an antioxidant in adhesives and adhesive foils; cable coverings and wire insulations; non-blooming EPDM-vulcanizates.
Dosage
The concentrations generally used are:
In latex compounds:
- 0.5 - 1.5 phr (by wt.) NAFTOCIT Di 7 as sole accelerator with 2.5 phr (by wt.) sulphur
- 0.1 - 0.3 phr (by wt.) NAFTOCIT Di 7 in combination with 0.4 - 0.8 phr (by wt.) NAFTOCIT Di 4 + 1.5 - 2 phr (by wt.) sulphur
- 0.8 - 1.5 phr (by wt.) NAFTOCIT Di 7 in combination with 0.2 - 0.6 phr (by wt.) NAFTOCIT ZMBT and 2.5 phr (by wt.) sulphur
In solid rubber compounds: - 0.1 - 0.8 phr (by wt.) NAFTOCIT Di 7 in combination with 0.5 - 1.0 phr (by wt.) NAFTOCIT MBT, NAFTOCIT MBTS or NAFTOCIT Thiuram 16 + 1.5 - 2.5 phr (by wt.) sulphur.
Food contact applications
BGA: Empf. XXI, Cat. 1
FDA: Regulated in CFR 21, §177.2600
Shelf life
At least 2 years when avoiding extremely high temperatures and humidity.
Standard packing
Multi-ply paper bags with PE-lining, 25 kg.
Product information
| NAFTOCIT Di 7 | NS | M | C | |
| Product form | powder | non dusting coated powder | wettable powder | non dusting oiled powder |
| Product Specification | ||||
| Melting point start (°C) min. | 175 | 175 | 175 | 175 |
| Melting point end (°C) max. | 185 | 185 | 185 | 185 |
| Purity (%) min. | 98 | 96 | 96 | 96 |
| Sieve residue 63 micro (%) max. | 0.1 | 0.1 | 0.1 | 0.1 |
| Additive content (%) | - | - | - | 1 - 2 |
| Evaporation loss 105 °C (%) max. | 0.3 | 2 - 3 | 2 - 3 | 0.3 |
| Colour | white to yellowish white powder | |||
| Odour | non pungent | |||
| Appearance | free of hard parts and conglomerations | |||
| Typical Properties | ||||
| Specific gravity 20°C (g/cm3) | approx. 1.47 |
Naftocit Di 7 is also availabie as a 50 % aqueous dispersion (Naftocit Di 7 D - 50 %).
As at: January 1998