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Modified NR Latex-Based Contact Adhesives
Modified Nr Latex-Based Contact AdhesivesConcerns regarding the environment as well as the health and safety of workers and consumers and consumers of solvent-based adhesives are gaining momentum worldwide. In the United States of America, for example, the local, state and federal governments are setting stricter limits on plant emissions and the volatile organic compound (VOC) content of adhesives.

A combination of factors including performance considerations, excise taxes and regulations governing VOCs will motivate adhesive manufacturers to evaluate advances made in water-based technology and encourage their customers to consider solventless systems.

Lembaga Getah Malaysia has successfully developed water-based contact adhesives using modified NR latices. These novel adhesives are particularly suitable for bonding to wood substrates.


All the materials used in the preparation of the contact adhesives are either aqueous dispersions or solutions.

Preparation of the various adhesives involves mixing of these aqueous ingredients in the required proportions by normal stirring. Such waterborne adhesives, being dispersions, need to be kept agitated to prevent the adhesive particles from settling out.

Excessive stirring or pumping rates, however, can cause foaming of the adhesive resulting in unevenness or gaps in the applied adhesive.

Another factor to consider in the mixing process is the potential for contamination by dirt or impurities: filtration may be effected with a system within the piping or by pouring the adhesive over a filter.

The main advantages of waterbased adhesives include absence of VOCs and hazardous air pollutants (HAPs), no explosion risk, reduced generation of hazardous wastes, lower insurance costs, and no need for solvent recovery or air pollution control systems.

There are some limitations, however, in processing waterborne adhesives including increased generation of wastewater and sludge, may need onsite wastewater treatment, cleaning is more time and energy intensive, and dry/cure ovens have higher energy consumption.

Other Info
  Processing Flow Chart
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