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

Electochemistry, what is agar-agar inert electrolyte

what is agar-agar inert electrolyte

Name the most basic amino acid, Name the most basic amino acid a) The m...

Name the most basic amino acid a) The most basic amino acid is arginine.  It has the highest isoelectric point. b) Glycine is not chiral and therefore it cannot be optically

S block elements, Ask question #Minimum 100 what is sodium pump words accep...

Ask question #Minimum 100 what is sodium pump words accepted#

Gels, classification of gels

classification of gels

Trends, Ask queatomic number atomic radius graph stion #Minimum 100 words a...

Ask queatomic number atomic radius graph stion #Minimum 100 words accepted#

Show chemical properties of thorium metal, Q. Show Chemical properties of T...

Q. Show Chemical properties of Thorium metal? You know that actinium and all the actinides are radioactive. Of these only uranium and thorium are extracted from ores, all other

Show the properties of tetrahydrido borate, Q. Show the properties of Tetra...

Q. Show the properties of Tetrahydrido borate? Tetrahydrido borate anion BH - 4 has a tetrahedral structure which can be explained on the basis of sp 3 hybridisation of boron

Structure of cis-1-3-di-tert-butylcyclohexane, Cis-1,3-di-tert-butylcyclohe...

Cis-1,3-di-tert-butylcyclohexane can exist in a chair conformation (A) in which both tert-butyl groups are equatorial.  Though, in either chair conformation of trans-1,3-di-tert-bu

Synthetic rubber, Short note on synthetic rubber. S ol. Synthetic rubbe...

Short note on synthetic rubber. S ol. Synthetic rubber: main types of synthetic rubbers: 1.                 Styrene rubber: Buna-S; Bu-Butadiene; Na=sodium; = Styrene

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