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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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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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Wednesday, June 17, 2009

What Are The Best Surfactants For Latex Compounds?

Manufacturer: We are manufacturers of latex dipped products using both natural rubber latex and synthetic latices. Our latex compounds are varied with some having low pH while others high pH. We would like to seek your advice on the choice of surfactants as effective stabilisers for our compounds. We've seen and sought the input from the suppliers of surfactants but although they have expertise in surface active agents, they lack knowledge of latex technology.

John Woon (Senior Latex Consultant): There are indeed many choices of surfactants in the market so much so that it could be very confusing and daunting experience in selecting the right surfactants for the right compounds especially to the new latex technologist.

I shall attempt to make it as simple as possible for you in my explanation and suggestion.

Generally, surfactants could be classified under four main groups, namely anionic, non-ionic, cationic and amphoteric.

My advice for you is to concentrate on the anionic first while keeping the non-ionic group in view only for specific conditions. Anionic group itself in turn could be further classified under carboxylates, sulphonates, sulphates and phosphates:

1) Carboxylates
For highest solubility and hence best stability, use the potassium soap. Use the ammonium soaps when the final films are to have the least water sensitivity especially when leaching could not be sufficiently done. I shall explain why you should stay away from the sodium soaps separately.

Good examples are potassium oleate, laurate and caprylates. However these are sensitive to acids and heavy metal ions.

2) Sulphonates
For your compounds with low pH, carboxylates might not be effective. I suggest you try the sulphonates which are less sensitive to acid (low pH) and dissolved heavy metal ions. This could be added in combination with the carboxylates.

3) Sulphates
This is more soluble than sulphonates and are even more superior in terms of resistance to low pH and free metallic ions.

Notes: Both sulphonates and sulphates are also good wetting agents which might be useful in your applications but they might retard the gelling process where calcium nitrate is used as the coagulant. For your purpose you also could use a combination of say, potassium laurate and sulphate.

4) Phosphates
These are mainly the inorganic polyphosphates. This has the mildest surface active agent. I'd discuss how and where you should use this along with the non-ionic surfactants separately.

Note: Amphoteric surfactant could be another good candidate for your compounds which are more acidic.







Wednesday, June 10, 2009

Vietnamese Prime Minister Approved Master Rubber Plan

According to an article on www.bernama.com, "As many as 800,000 ha will be devoted to rubber plantations with annual latex production of 1.1 million metric tons by 2015 under a new plan approved by Prime Minister Nguyen Tan Dung, Vietnam News Agency (VNA) reported Monday [June 8].

The plan developing rubber cultivation to 2015 with a vision to 2020 will be based on market needs and on effectively exploiting the advantages of land and other natural resources in specific regions to ensure sustainable development, according to the government.

Under the plan, an additional 70,000 ha of rubber will be planted by 2010, raising the country's total rubber area to 650,000 ha and annual rubber latex output to 800,000 metric tons. By 2015, the export value of rubber products is expected to reach $1.8 billion. Five years later, the country's rubber cultivation area will be kept stable at 800,000 ha, while annual rubber latex output will increase to 1.2 million metric tons and the export value to $2 billion, the plan envisages.

Rubber cultivation will be focused in five major regions -- the southeast region, the central highlands region, the southern central coastal region, the northern central region and northwest provinces. The central highlands will grow an additional 95,000-100,000 ha of rubber, becoming the region with the largest new rubber plantations. The southeast region, which accounts for the country's largest rubber cultivation area at present, will plant an additional 25,000 ha.

Total investment outlay for the plan is estimated at 30 trillion VND ($1.76 billion). Under the plan, the government will continue to provide capital for research projects that will select and create new hybrid varieties of rubber. It will also fund projects to import rubber varieties of high yield and quality, and supply enough seeds for nurseries to meet production demand.

Enterprises will be encouraged to sign contracts with rubber growers to ensure stable consumption of latex. The plan seeks to increase investment in latex processing facilities and production of rubber products in cultivation regions. Trade promotion activities will be undertaken to expand export markets to boost sales of rubber products. The government will also encourage individuals and organizations to plant rubber, process latex and produce rubber products. The Vietnam Rubber Association has been advised to enhance its capacity to support and create favorable conditions for members, as well as protect their legitimate rights.

Laboratory Safety Course

Learn best practices to minimize personal injury, health impairment, property loss, fines, and liability in your laboratory. This course gives you an overview of the practical and latest regulatory measures for the prevention of accidents, incidents, or exposures that may cause health impairment, injury, fire, or interference with laboratory operations. It includes the OSHA training requirements for a Chemical Hygiene Officer.
Click HERE to register

Saturday, June 06, 2009

Devulcanisation System For Waste Tyres

A UK project to develop a continuous devulcanisation system for waste tyres has been hailed a success by its developers.

Smithers Rapra said the DevulC02 project “successfully surpassed its aims of developing a novel, effective and commercially competitive devulcanisation system for waste tyre rubber, and to evaluate the devulcanised rubber manufacturing a variety of general rubber goods.”

Funded by the government’s Technology Strategy Board, the DevulC02 project involved three years of research by a consortium comprising Smithers Rapra, PJH Partnership, Martins Rubber Company, BD Technical Polymer, J. Allcock & Sons, and Charles Lawrence International.

Smithers Rapra said the technology is ready to be scaled up to commercial levels of production and is now seeking contact with companies wanting to take products to market.

Friday, June 05, 2009

Benefits of Natural Rubber Versus Risks of Alternative Materials

Manufacturer: We are looking for literature materials for our products brochures to emphasize the strength and advantages of natural rubber used in many of our latex products against other synthetic alternatives. I hope you could help us.

John Woon (Senior Latex Consultant): Consider this done! I have an excellent article which you should not miss - "Benefits of Natural Rubber versus Risks of Alternative Materials"
Please go HERE now to read the article.

FDA Approved Antioxidants and Antiozonants for Latex Dipped Products

Manufacturer: We are looking for antioxidants and antiozonants to be incorporated in our latex dipped products that would come into contact with food. Can you let us know some that are approved by FDA of the USA?

John Woon (Senior Latex Consultant): Used at below 5% of the rubber weight of the products, there are quit a number of antioxidants and antiozonants you could use. Avoid the "amine-type" if discolouration would be a problem.

Please go HERE for the list under FDA CFR Title 21 Part 177.2600

PART 177 -- INDIRECT FOOD ADDITIVES: POLYMERS

Subpart C--Substances for Use Only as Components of Articles Intended for Repeated Use




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What has the bouncing ball to do with tyres?

Latex Gloves Educational Articles from the Malaysian Rubber Export Promotion Council

How do you select your medical gloves?

Rubber Chemicals: Carcinogenicity, Mutagenicity, Clastogenicity.

Why is Compression Set measurement important?

Assessment of Latex Stability

Joule Effect

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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