It is a process of changing the physical properties of rubber using heat and vulcanizing agents like peroxide, sulphur powder, etc.

1. CONVEYOR BELT VULCANIZING
NIPL Engineering Pvt. Ltd

2. Origin of vulcanization method
Rubber vulcanization started in 1839 after it was discovered by
Charles Goodyear. Though, it was Thomas Hancock (1786-1865) who
patented vulcanization of rubber and was awarded patent on 21 May,
1844 in Britain. On 15 June 1844, Goodyear was awarded the patent
in the US. Hancock’s was the first patent for vulcanization of rubber.

3. Define vulcanization
It is a process of changing the physical properties of rubber using heat
and vulcanizing agents like peroxide, sulphur powder, etc. Through
vulcanization the elasticity increases as the plasticity decreases.
There are two types of additives used for conveyor belt
vulcanization:
1. Accelerators are chemical substance used for vulcanization
to reduce curing time
2. Activators are compounds to increase the performance of
accelerators

4. Accelerators are reduces oxidative degradation of elastomers during
the vulcanization process, thereby improving the property of
vulcanisates. Accelerators can be divided into the following based on
the vulcanization rate:
• Slow: Di-o-tolyl guanindine (DOTG)
• Medium: N-Cyclohexylbenzothiazyl-2-sulfenamide (CBS)
• Fast: 2-Mercapobenzothiazole (MBT)
• Ultrafast: Tetramethyl thiuram monosulfide and Tetramethyl
thiuram disulfide

5. Activators increase the efficiency of accelerators and they can be
divided into:
• Zinc oxide (ZnO) – It is considered the most popular
vulcanizing activator and is used along with other accelerators.
• Magnesium oxide(MgO) - It is used for vulcanization of
neoprene type elastomers.
Vulcanization can be divided into:
• Sulphur Vulcanization primarily used for curing unsaturated
elastomers. Sulphur powder is used as vulcanizing agent.

6. Peroxide Vulcanization is where organic peroxides are used as
curing agents. It does not enter the polymer yet generates free
radicals forming C-C linkage with adjacent polymer chain. It is
applicable for saturated and unsaturated rubbers. The benefits
include transparent and stable products due to the C-C bond which
is more stable than sulphur bond. There is no cross linked
reversion.

7. NIPL Engineering Pvt. Ltd
Phone: +91 444 214 5016 | +91 444 214 5017
Email: info@beltpro.in
Website: http://www.beltpro.in/