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

High initial permeability in fe-ni alloys, Illustrate how a high initial pe...

Illustrate how a high initial permeability in Fe-Ni alloys helps to reduce the area under hysteresis loop. The most favourably oriented fully-grown domain tends to rotate so a

Formation of nacl from na and cl, In the formation of  Nacl from Na  and...

In the formation of  Nacl from Na  and  cl: (1) Sodium and chlorine both give electrons (2) Sodium and chlorine both accept electrons (3) Sodium loses electron and chlori

List the factors influencing product development, Q. List the factors influ...

Q. List the factors influencing product development? The factors influencing product development are growing urbanization, changes in life style, increasing number of small fam

Nitro compounds, explain why boiling and meliting points of nitroalkanes th...

explain why boiling and meliting points of nitroalkanes than that of iosmeric alkyl nitrites

TOLUENE, HOW TOLUENE CAN BE PREPARED

HOW TOLUENE CAN BE PREPARED

Actinide, what are ionization energy of actinides?

what are ionization energy of actinides?

Determine the formula of the compound, A compound is prepared by two elemen...

A compound is prepared by two elements N and M. The element N forms ccp structure and atoms of M occupy 1/3rd of tetrahedral voids. Determine the formula of the compound ?

Elements, list the elements that have all 3 properties: lustre , malleabbil...

list the elements that have all 3 properties: lustre , malleabbility and conductivity

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