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

Define standard feat of formation, The quantity of heat liberated of absorb...

The quantity of heat liberated of absorbed when one mole of compound is formed in its standard state from its elements in their standard state is known as standard heat of formatio

Organic chemistry, it is impossibe to synthesise orgnic compounds in the la...

it is impossibe to synthesise orgnic compounds in the lab since life force is essential for their formation -theory is known as

Chemical equation of the peroxodisulfate ion, Chemical Kinetics of the Pero...

Chemical Kinetics of the Peroxodisulfate Ion The peroxodisulfate  ion is one of the strongest oxidants that are  called, although the oxidation reaction is relatively slow.

Quantum mechanics, Q. Illustrate the Quantum Mechanics? Ans: In 1924,...

Q. Illustrate the Quantum Mechanics? Ans: In 1924, a French scientist named Louis de Broglie proposed another model for the nature of the electrons in atoms. He predicted tha

Carbon, why must the mass relative of atom refer to atomic mass of C

why must the mass relative of atom refer to atomic mass of C

Determine the phase or phases present at equilibrium, Q. Iron chloride form...

Q. Iron chloride forms various solid hydrates, all of which melt congruently. The temperatures t of aqueous solutions of various compositions that are saturated with respect to a s

Show the colorimetric analysis, Q. Show the Colorimetric analysis? Colo...

Q. Show the Colorimetric analysis? Colorimetric analysis depends on the variation of the colour with the change in concentration of the compound. Usually, absorption of light i

The possible values of magnetic quantum number would be, If the value of az...

If the value of azimuthal quantum number is 3, the possible values of magnetic quantum number would be: (1) 0, 1, 2, 3          (2) 0, - 1, - 2, - 3    (3) 0 ± 1±  2,± 3

Flame photometer, What is the advantage of using a flame photometer instrum...

What is the advantage of using a flame photometer instrument designed to operate with an internal standard ?

Factors affecting chemichal shift ., 1.sheilding & de-sheilding 2.magnetic ...

1.sheilding & de-sheilding 2.magnetic anisotropy 3.hydrogen bonding

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