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

Metallurgy, Al is used as reducing agent for the extraction of metals such ...

Al is used as reducing agent for the extraction of metals such as Chromium,Monganes.Explain why? Solution) Al3+ + 3 e- Al Good reducing agents like aluminum have relatively

Illustrate atomic number, Each element has a unique number of protons. This...

Each element has a unique number of protons. This unique number is known as the element's atomic number . All atoms of a given element have the same atomic number. For example:

Transition metal do not displace hydrogen from dilut acid, Most of the tran...

Most of the transition metal do not displace hydrogen from dilut acid. why? Ans) The activity series of transition metals is less than that of hydrogen so they can not displace h

Solid state, how many solid state are there?

how many solid state are there?

What is scientific law and theory, Q. What is scientific law and theory? ...

Q. What is scientific law and theory? A theory is a description that has been supported by many experiments. Theories declare broad principles of nature. Even though theories a

Show the extraction of oxygen, Q. Show the Extraction of Oxygen? Oxygen...

Q. Show the Extraction of Oxygen? Oxygen is separated from air on a large scale by the fractional distillation of liquid air. It is obtained as a by-product along with hydrogen

Apply kinetic molecular theory to liquids, Q. Apply Kinetic Molecular Theor...

Q. Apply Kinetic Molecular Theory to Liquids? Ans. The Kinetic Molecular Theory (KMT) states that the particles of liquids are in constant random motion. Their motion, how

What is the mechanism of e1cb?, E1cb means elimination, unimolecular, of th...

E1cb means elimination, unimolecular, of the conjugate base. This type elimination proceeds through the carbanion mechanism. An carbon compound, acting as an acid, is attacked by

The following quantum no.represent an imposssible arrangment, Which of the ...

Which of the following sets of quantum numbers represent an impossible arrangement:         n          l          m        m2      (1)   3          2        - 2        (+)

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