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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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Friday, April 27, 2007

Chemical Blooming and Copper Staining


Manufacturer:We have been having chemical blooming and copper staining problems on our dipped latex films. We believe this is due to ZDEC (Zinc Diethyldithiocarbamate) we are using.
How could we minimize these problems? For some reasons we cannot reveal, we have only a choice among ZDMC, ZDEC and ZDBC.

JohnWoon:Among the 3 common dithiocarbamates you mentioned, ZDBC has the least tendency to bloom due to it being the most soluble in rubber. For the same reason, ZDBC would be expected to have relatively lower tendency to cause staining in the presence of trace copper. The usual yellowish to brownish stain is due to the formation of a complex of copper dithiocarbamates.

Please take note that the activity and solubility of these dithiocarbamates in rubber increase as the chain length of the alkyl group increases.

Having said this, you have to be careful in your reformulation as ZDBC has a faster curing rate at room temperature compared to ZDEC. Please refer to my more detailed report despatched to you separately.


You are at the site for answers and solutions to all your problems in natural rubber latex processing and manufacturing of medical gloves, condoms, catheters, baby teats and baby pacifiers.

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Introduction to SMG Gloves

 

 

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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