Cyclohexilamine in rubber applications
Rubber latex is a stable dispersion of polymeric substances in aqueous medium and is essentially a two phase systems :
1. Disperse phase ( discontinous phase of rubber molecules )
2. Dispersion medium ( aqueous continous phase of serum )
Natural Rubber Latex ( NR Latex ) is the most widely used latex for the manufacture of latex based rubber products.
LATEX PRODUCTS MANUFACTURE
Manufacturing Process Products
1. Dipped latex products Surgical globes, Household gloves, industrial gloves,
contraceptives, feeding bottle teats, Toy balloons etc.
2. Foamed latex products Mattresses, Pilows, Upholstery, Carpet Backings,
Packagings, Packaging material etc.
3. Latex extrusions Latex thread.
4. Latex spreading Carpet backing, Textile treatment, Paper coatings
5. Latex casting Toys, Bulbs
6. Miscellaneous Rubberized coir/ Fiber products, Battery separators,
Adhesives and PV Latex.
1. DIPPED LATEX PRODUCTS
Dipping process is described as : Immersion of a former into a suitable
latex compound followed by a slow withdrawal in such a way so that a
uniform deposit of latex compound film is formed around the outside of
the former which is subsequently dried, leached, vulcanized and stripped to
obtain a finished product.
The dipping methods are classified as straight DIP, SINGLE DIP, MULTI DIP, WET
COACERVANT DIP, DRY COACERVANT DIP, HEAT SENSITIZED DIP and ELECTRO
DEPOSITION DIP.
DRY COACERVANT DIPPING ( Coagulant Dipping )
The most widely used dipping method, involves use of dry coacervants such as calcium chloride,
calcium nitrate, cyclohexyl ammonium acetate & a few other salts.
The former is then dipped into latex compound and allowed to dwell for optimum time to build up desired thickness. The dwell time depends on the type & concentration of the coacervant and the stability of latex compound towards the coacervant.
One of the example of dry coacervant solutions as belows :
Cyclohexyl ammonium acetate used as coacervant when products of optimum clarity are desired. This also provides superior bead adhesion and mild antioxdiant action.
Cyclohexilamine 12.4 pbw
Glacial acetic acid 7.6 pbw
Methyl Alcohol 80 pbw
Michael
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