Natural rubber, Chemistry

Assignment Help:

Natural rubber: Natural rubber is obtained by making small incisions on the bark of certain types of trees, like "Have a brasiliensis" and "Ganynle". White milky liquid substance (rubber latex) from the rubber tree by tapping is obtained. Latex is sieved to remove impurities then coagulated using coagulants like acetic acid or formic acid. Coagulated mass convert into coagulum. Coagulum is washed, dried and treated as follows:

1. Copper rubber: It is prepared by adding, little amount of sodium bisulphite, a retarder prevents, the discoloration and softening of rubber. Coagulum is allowed to drain for about two hours and after that it is passed through a creeping machine to form sheets of rubber of about 1 mm.

2. Smoked sheet: For preparing smoked sheets coagulation is carried out in long tanks. Sides of the tank have vertical grooves fitted with metal plates. First, dilute latex is added into the tanks and before that plates are removed. Coagulating agent, formic acid or acetic acid is then added and mixture is thoroughly stirred then plates are fitted and allowed to dry slabs are formed.

 

 


Related Discussions:- Natural rubber

Binary phase diagrams of two component systems, Binary phase diagrams of tw...

Binary phase diagrams of two component systems are usually Two dimensional plots of temperature and composition.

Combustion reactions, How many moles of octane must be burned to release 52...

How many moles of octane must be burned to release 525.1 kcal ?

Difference between vegetable oils and mineral oils, Difference between vege...

Difference between vegetable oils and Mineral oils Property Vegetable oils Minerals oils 1.  Composition These ar

Teaching methods in chemistry, list the advantage and disadvantage teaching...

list the advantage and disadvantage teaching methods in chemistry

Price ceiling problems, Price ceiling problems: The persistent shortage ...

Price ceiling problems: The persistent shortage created by price ceiling will in turn pose the following problems:  Rationing Government may have to apportion the quantity s

D block elements, Why do Zr and Hf show similar properties?

Why do Zr and Hf show similar properties?

Potentiometry, Lab Report Report the mass of KCl and KI in the original unk...

Lab Report Report the mass of KCl and KI in the original unknown sample. Include plot of titration. How do I calculate amount in unknown from titration and what is the curve suppos

Polymer, how vulcanisation does changes the chareter of natural rubber

how vulcanisation does changes the chareter of natural rubber

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd