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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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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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Saturday, March 17, 2012

Why is Borax used In Adhesives?

Manufacturer: We are using Polyvinyl acetate and Polyvinyl alcohol emulsion in combination with starch as bonding agents for paper and textile materials. In view of our concern over toxicity level of our compounding ingredients, we've removed borax from our formulations.

However we encountered a drop in the quality of our products in our lab evaluation due to delamination where the adhesives are being applied. Can you help us?

 John Woon (Senior Latex Consultant):  I'm not surprised at all by your findings.
Borax, also known as sodium borate or sodium tetraborate is often added to water-based adhesives especially those containing starch and Polyvinyl alcohol to enhance the tack and "body" (i.e. green strength) of the adhesive by crosslinking conjugated hydroxyl groups. Such cross-links are formed through the borate anion structure leading to a more highly branched polymer with higher molecular weight which accounts for the increased in viscosity, tack, and rheology properties of the resulted adhesives.

I don’t see why you should be unduly worried about the toxicity of borax because it is one of FDA's (USA) approved materials used in the manufacture of paper and paperboard products for food packaging as long as you don’t add borax directly into the food.

If you still insisted in removing borax from your formulation, you should have replaced it with other tackifiers and latex thickeners.

It might interest you to know that "Flubber Slime" that is popular among children is actually made by mixing Polyvinyl acetate or Polyvinyl alcohol emulsion with borax.




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Assessment of Latex Stability

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Poor Flocking Quality Of Household Gloves

Creaming of Latex

What is Vulcanization?

History of Latex Dipped Products

Applications of Prevulcanized Latex

Defoamer Creating Havoc in Glove Factory

Problems With Milling Rubber Chemicals

Medical Gloves From Guayule Latex

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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