 The
MRB has developed a new generation peroxide prevulcanised NR latex
that produces product with improved ageing resistance, stable colour
during drying and low level of extractable proteins. Treatment of
this material produces products with low extractable protein and allergenic
protein contents.
There are
three important approaches to produce low nitrosamine latex products:
- Using low nitrosamine accelerator system such as zinc dibenzyldithiocarbamate/zinc
mercaptobenzothiazole
- Peroxide prevulcanised NR latex, and
- Radiation vulcanised NR latex. The level of nitrosamine in latex
products could also be reduced to a certain degree by surface
treatment and washing of latex films. The concern of non-volatile
nitrosamines and cytotoxicity of additives used in latex product
may affect future acceptability of the zinc dibenzyldithiocarbamate/zinc
mercaptobenzothiazole system.
There are other advantages of producing products from peroxide
prevulcanised latex or radiation vulcanised latex. Unlike those
prepared using accelerated latex vulcanising systems, peroxide or
radiation vulcanised latex does not contain vulcanising accelerators
that could cause type IV allergic reactions, zinc compounds that
pose disposal problem of products, nor sulphur containing compounds
that make the product unsuitable for applications in the electronic
industry and safe product disposal by incineration.
Manufacturing Process
A. Using ZBED (zinc dibenzyl dithiocarbamate)
/ ZMBT (zinc mercaptobenzothiazole) accelerated sulphur vulcanising
system
B. Using peroxide prevulcanised NR latex
C. Using radiation vulcanised NR latex
|
