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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Send Your Enquiry and Orders To: woonsungliang@yahoo.com.sg
Problem Solving Through E-Mails with John Woon Latex Consultants Is Possible
可以通过电子邮件与JW乳胶顾问来解决问题
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Study of Effects of Surface Tension in Latex Dipping Process
Manufacturer: We are manufacturers of a varied range of latex dipped products. We believe we are having some wetting problems with our coagulants and latex and would like to use surface tenstion measurement for our initial work. What should we do?
John Woon (Senior Latex Consultant): I suggest you study the effect of both the "Equilibrium Surface Tension" based on Du Nouy Ring and Wihelmy Plate methods and the "Dynamic Surface Tension" by maximum bubble pressure. (Kyowa Interface Science Co., Ltd. gives the following illustration)
Dynamin surface tension is particularly useful in understanding its effect in a dynamic system such as that experienced by you in your dipping process, where new interfaces are rapidly encountered.
Your surfactants suppliers should be able to give you more details.
Freeze-Thaw Stability of Natural Rubber Latex Concentrates
Manufacturer: We are using centrifuged latex concentrates from Thailand and very often encountering latex stability problem during winters. Can you explain why and how we can ensure better freeze-thaw stability of the latex.
John Woon (Senior Latex Consultant): If you are storing your latex just above freezing temperatures, the colloidal stability of the latex is normally still acceptable. But once the water phase of the latex is frozen at sub-zero temperatures, latex destabilization would occur with an increase in viscosity and a drop in mechanical stability even after the latex has been thawed.
The frozen of the water phase would force the latex particles to collide and adhere with each other and hence destabilization. In severe cases, this would lead to irreversible coagulation and gelation.
The good news is that freeze-thaw stabilized centrifuged latex concentrates are available from the latex producers if such requirement is specified by the buyers. The improved stability is normally done through the addition of sodium salts of certain phenolic additive and ammonium laurate soap.