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

Assignment, Applications of radiometric titration in pharmaceutical industr...

Applications of radiometric titration in pharmaceutical industry #

Define rutherford's experiment, Ernest Rutherford in 1909 conducted what is...

Ernest Rutherford in 1909 conducted what is now a famous experiment where he bombarded gold foil with alpha particles (Helium nuclei). A source which undergoes for alpha decay is

Acids and bases, what is the difference between acids, bases and alkalis?

what is the difference between acids, bases and alkalis?

Purge and recycle stream, The fresh feed to an ammonia production process c...

The fresh feed to an ammonia production process contains nitrogen (N2) and hydrogen (H2) in stoichiometric proportion, along with an inert gas (I). The feed is combined with a re

Intercoversion of alcohol, explain the chemical change that take place in t...

explain the chemical change that take place in the conversion primary alcohols into secondary alcohols

Characteristic flame colour - chemical analysis, Characteristic flame colou...

Characteristic flame colour: specific metals and their salts impart particular colours to Bunsen burner flame.         (1)  Pb (plumbum) impart pale greenish colour to the f

Write the structural formula of 3-phenylprop-2-enal, (a) Write the structur...

(a) Write the structural formula of 3-phenylprop-2-enal. (b) Write one chemical equation each to illustrate the following reactions: (i) Aldol condensation (ii) Cannizzaro

Matter, name any 10 chemical compound used at homewith their molecular form...

name any 10 chemical compound used at homewith their molecular formula

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