Flow sheet manufacturing diagram of Nylon 66

Apr 27 • General • 9823 Views • 1 Comment on Flow sheet manufacturing diagram of Nylon 66

  • Nylon 6,6 is a semi crystalline poly-amide commonly used in fiber applications such as carpeting,clothing and tire cord.
  • It is also used as an engineering material in bearings and gears due to its good abrasion resistance and self-lubricating properties.

                                Chemical formula- C12H22O2N2

                           Chemical structure-  PA66 repeat unit

                                                                              Nylon-6,6

Properties of Nylon 6,6 

  • Glass transition temperature: 50oC.
  • Melting  temperature: 255oC.
  • Amorphous density at 25oC: 1.07g/cm3.
  • Crystalline density at 25oC: 1.24g/cm3.  
  •   Molecular weight of repeat unit : 226.32g/mol . 

   Manufacturing Process of Nylon 6,6                    

  •  The manufacturing process starts with the production of two chemicals hexamethylene  diamine and  adipic acid both of which contains 6 carbon atoms from coal.
  • These chemicals are combined to form the nylon salt, which is dissolved in water and sent to the spinning mill.
  • The nylon salt solution is made  into a concentrated solution by heating in large  evaporators.
  • The concentrated solution is then heated in an autoclave under the pressure and temperature.The polymerization   takes place combining the two chemicals into polymers which are like a giant chains.

The molten polymer is processed in a manner similar to nylon 6.

                                   

                                                Manufacturing Process of   Nylon 6,6

Nylon 6,6

  Drawing:

  The filaments obtained from spinning are stretched by drawing process. the drawing process is accomplished in 2 ways;

  •      Unwinding the yarn from one godet, or wheel,

     Winding it onto another godet that is rotating much faster.The  Speed of the second wheel determines the amount of cold-drawing or stretching.

The yarn from the second godet is wrapped on a cylindrical tube called a pirn.

The filaments can be stretched from 2 to 7 times their original length. The
molecules in the filament structure straighten out, become
parallelized, and are brought very close together.

                 

 QUESTION AND ANSWERS..

Q1) Write the chemical formula and chemical structure of nylon 6,6?

Ans-

          chemical formula : C12H22O2N2

 chemical structure:  PA66 repeat unit

 Nylon-6,6

Q2) Write the  Manufacturing Process of   Nylon 6,6 with proper diagram?

Ans-                                                                    

 Manufacturing Process of Nylon 6,6       

  •  The manufacturing process starts with the production of two chemicals hexamethylene  diamine and  adipic acid both of which contains 6 carbon atoms from coal.
  • These chemicals are combined to form the nylon salt, which is dissolved in water and sent to the spinning mill.
  • The nylon salt solution is made  into a concentrated solution by heating in large  evaporators.
  • The concentrated solution is then heated in an autoclave under the pressure and temperature.The polymerization   takes place combining the two chemicals into polymers which are like a giant chains.

The molten polymer is processed in a manner similar to nylon 6.

Q3)How the diagram will be done?

Ans- The filaments obtained from spinning are stretched by drawing process. the drawing process is accomplished in 2 ways;

  •      Unwinding the yarn from one godet, or wheel,

Winding it onto another godet that is rotating much faster.The  Speed of the second wheel determines the amount of cold-drawing or stretching.

The yarn from the second godet is wrapped on a cylindrical tube called a pirn.

The filaments can be stretched from 2 to 7 times their original length. The
molecules in the filament structure straighten out, become
parallelized, and are brought very close together.

 

 

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One Response to Flow sheet manufacturing diagram of Nylon 66

  1. mamu says:

    thermal stability of bases

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