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

Explain the term field processing, Field processing Certain processing ...

Field processing Certain processing techniques at the field itself could help to reduce the chances of spoilage of  the fresh produce, specially during transportation. Fruits a

Tie line, tie line explain in with the help of phase rule

tie line explain in with the help of phase rule

Hubles Test, Explain in brief hubles test for any test splution

Explain in brief hubles test for any test splution

Physical properties of phthalic acid, Physical properties of Phthalic Acid ...

Physical properties of Phthalic Acid  (a) Phthalic acid is colourless crystalline substance. (b) Phthalic acid's melting point is not sharp (195-213°C). (c) Phthalic acid

Evaluate precentage proteins in milk, Q. Evaluate precentage Proteins in Mi...

Q. Evaluate precentage Proteins in Milk ? Milk comprises of casein, lactoalbumins and lactoglobulins. About 82 per cent of the protein in milk is casein and the remaining prot

Equivalent weights, molecular weight of orthophosphoric acid is M.Its equi...

molecular weight of orthophosphoric acid is M.Its equivalent weight

S block elements, why lithium and beryllium markedly differ from other memb...

why lithium and beryllium markedly differ from other members of their respective groups?

Stuructural proteins, what is the role of structural protein, their types, ...

what is the role of structural protein, their types, how are they formed, significance.

Trends in alkali metals, what is the order of solubility of alkali metal hy...

what is the order of solubility of alkali metal hydrides and halides

Hybrisation, examples of spd arrangement

examples of spd arrangement

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