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 the term "rice bran", Rice bran Rice bran contains primarily ins...

Rice bran Rice bran contains primarily insoluble fiber (cellulose) and soluble fiber (hemicellulose). Insoluble fiber adds bulk to the gastrointestinal (GI) track in humans cau

Bohr orbits in an atom of hydrogen, In Bohr series of lines of hydrogen spe...

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom

To prepare crystals of pure phthalic acid from impure sample, what will be ...

what will be theory of phthalic acid of crystallization?

Plant nutrion, name an artificial fertilizer or fertilisisers which farmer ...

name an artificial fertilizer or fertilisisers which farmer can use to increase the supply of nitrate,phosphate and potassium to their crops.what are the function of ions?

Mining of petroleum and petroleum refining, Mining of petroleum and Petrole...

Mining of petroleum and Petroleum refining (1) Mining of petroleum: Petroleum deposits takes place at varying depth at different places ranging from 500 to 15000 feet. This is

Test for the presence of argemone oil, Q. Test for the presence of argemone...

Q. Test for the presence of argemone oil? This test helps to detect the presence of argemone oil. Argemone mexicana  is the plant, which yields seeds of this oil.  The seeds ar

Volumetric method for acids and bases - chemical methods, Volumetric method...

Volumetric method for acids and bases - chemical methods Molecular mass of an acid can be ascertained by dissolving a known mass of the acid in water and titrating the solution

Electronic configuration exhibits, 3d 10 4s0 electronic configuration exhi...

3d 10 4s0 electronic configuration exhibits by; (1) Zn ++                                (2) Cu ++                          (3) Cd ++                      (4) Hg ++

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