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JW Latex Consultants (and Rubber Consultants,乳胶顾问) offer solutions to your problems in Natural Rubber latex and Synthetic Rubber latex processing and the manufacturing of latex products (condoms, catheters, medical gloves, baby teats and soothers, toy balloons etc) Quick answers through e-mails are possible at reasonable cost.

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Sunday, December 28, 2014

Wet Tack and Dry Tack of Latex Based Adhesives

Manufacturer: I am new to latex based adhesive technology. Please explain the difference between wet and dry tack and how to improve them.

John Woon (Senior Latex Consultant): "Wet tack" is the ability of the latex to hold to layers of materials together before drying. This depends a lot on the nature of the substrates concerned.  A solid impermeable substrate is more difficult to adhere to compared with, for examples, a porous textile or paper board.

Other factors involved in ensuring good wet tack are:

1) Surface tension and wetting - A good wetting with low surface tension is required for the initial spreading and wetting of the substrates.
2) Total solid content - Higher TSC is required for higher initial tack.
3) Mechanical stability - Lower mechanical stability is needed for the quick development of the wet tack.
4) Types of stabilizers used - rosin acid soaps are preferred to fatty acid and non-ionic soaps.
5) Nature of polymer - Lower Tg is preferred to ensure the polymer is soft enough for better particle-to-particle integration and  film formation.

As for "dry tack", I have already covered this in my earlier posting om "Nitrile Latex Adhesives" below.



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