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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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Wednesday, August 06, 2008

Vulcanisation and thickening of positively charged Natural Rubber and Nitrile latices (latexes)



Manufacturer: We managed to produce positive charged natural rubber latex and Nitrile latex. This is for coating and impregnating textiles which usually have negative charges. To our satisfaction, we found the adhesion of the latex to the textile to be superior compared to normal centrifuged natural rubber latex concentrates (i.e. CL 60 HA or LATZ) and standard Nitrile latex.

However, our problem is that the ageing resistance of the rubber is quite poor. To overcome this we decided to add curing agents to vulcanize the rubber. However we encountered latex stability problem during mixing of the latex compounds. Also, we had problems when we intended to increase the latex viscosity with acrylic types of thickener.

Your suggestions on how we could overcome these problems would be appreciated.


John Woon (Senior Latex Consultant): If you are using conventional dispersing agents for the preparation of your curative dispersions or you are using ready made dispersions from external sources, I won’t be surprised at all that you’re experiencing the latex stability problem you mentioned.

You should use only cationic surfactants and perhaps along with only non-ionic surfactants as your dispersing agents because your latex particles are positively charged, unlike the usual natural rubber and nitrile latex concentrates. Examples of the former are quaternary ammonium compounds such as cetyl trimethyl ammonium chlorides and cetyl pyridium bromide while examples of the latter are condensation products of ethylene oxide with fatty acids, alcohols or phenols.

As regards the latex thickeners, you should not use anionic type like sodium or ammonium polyacrylates. Your better bet should be those based on methyl cellulose.







You are at the site for answers and solutions to all your problems in natural rubber latex processing and manufacturing of industrial, household and medical gloves, condoms, catheters, baby teats and baby pacifiers, toy balloons, latex foam products, latex threads etc.

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Click on The Following Links to Read More Articles:

[Advantages of Vulcanization] [Applications of PV Latex] [Bacteria and Latex] [Chemical Toxicity] [Cross-Linking Density] [Biodegradability] [Black Articles] [Blooming] [Bouncing Ball] [Compression Set] [Condoms] [Creaming] [Defoamer] [FDA] [Fatty Acid Soaps] [Flame Retardant] [Flocking] [Food Packaging] [Glove Demand] [Glove Selection] [Guayule Latex] [History of Gloves] [Joul Effect] [Latex Stability] [Latex Thread] [Milling Problem] [MREPC Articles] [Nano Polymer Particles] [Nano ZnO] [Polychloroprene] [REACH] [SMG] [Storage Hardening] [Vulcanization] [Vytex] [Yulex]

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