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

Types of titrations - oxidation reduction titrations, Oxidation Reduction T...

Oxidation Reduction Titrations The titrations based upon oxidation-reduction reactions are termed redox titrations. The chemical reactions proceed along with transfer of electr

Determine electronic configuration, Electronic configuration  1s 2 2s 2 2...

Electronic configuration  1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1   represents: (1) Ground state (2) Excited state (3) Anionic state (4) All of these Ans:  Ground

PH and DO, does lowered pH of water affect dissolved oxygen?

does lowered pH of water affect dissolved oxygen?

Explain sensory panel, Sensory panel During the product development cy...

Sensory panel During the product development cycle it is necessary to conduct periodic quality assessment of the product being developed.  This is done either with a consumer

Vapor pressure, Fractional distillation is based on boiling a solution of t...

Fractional distillation is based on boiling a solution of two liquids and collecting the vapor above them multiple times. This method is often used in creating distilled spirits wi

Lanthanide chemistry, Why lanthanides shows more than 7 coordination number...

Why lanthanides shows more than 7 coordination number

F block elements, why f elememnts kept sepertaly in periodic table

why f elememnts kept sepertaly in periodic table

Advantages of icp-aes method, Advantages of ICP-AES method: The wide a...

Advantages of ICP-AES method: The wide applicability of ICP-AES in the quantitative analysis of various materials can be attributed to the following advantages. Rapid a

Orbital angular momentum for a d-electron, Orbital angular momentum for a d...

Orbital angular momentum for a d-electron is: (1) 6h/ 2Π             (2) √6/ 2 Π (3) 12 h/ 2Π (4)  √12h/ 2Π Ans:  √6/ 2 Π

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