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

Radiometric titration, what are the principles of radiometric titration

what are the principles of radiometric titration

Anode rays, does the nature of the anode rays depend upon the nature of the...

does the nature of the anode rays depend upon the nature of the discharge tube and the nature of the electrode?

TitrATION., HOW TO CALCULATE TITRE FACTOR.

HOW TO CALCULATE TITRE FACTOR.

Title: Organic, Show by means of equations and reagents, how the following ...

Show by means of equations and reagents, how the following conversion would be achieved? Propyne to butanoic acid

Show multiplying quantities written in scientific notation, Q. Show Multipl...

Q. Show Multiplying Quantities Written in Scientific Notation? Multiplying Quantities Written in Scientific Notation Solve the following problem. (2 * 10 14 cm) * (9 *

LIQVID CRYSTAL.., I HAVE TO PREPARE A ASSIGNMENT ON LIQUID CRYSTAL. AND I W...

I HAVE TO PREPARE A ASSIGNMENT ON LIQUID CRYSTAL. AND I WANT TO MAKE IT DIFFERENT FROM OTHER, ACTUALLY I GOT THE MATTER FROM OUR BOOK BUT OUR TEACHER SAID THAT YOU DON''T HAVE TO C

Phenol concentration in the water and oil, A chemical transport barge routi...

A chemical transport barge routinely carries chemicals across Lake Futura. In an unfortunate incident the chemical transport barge, carrying a solution of phenol in synthetic oil,

Which of the following electronic configuration, Which of the following ele...

Which of the following electronic configuration is not possible: (1)  1s 2 2s 2                           (2)  1s 2 2s 2   2p6                   (3) [Ar]3d 10 4s 2 4

Organic chemistry, advantages and disadvantages of westron

advantages and disadvantages of westron

Liquification of gases, tell me about liquification of gases in detail but ...

tell me about liquification of gases in detail but in most easy words

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