Method for Evaluating Properties of Melt-Blown Plastic Resin

Abstract

A method for evaluating physical properties of a melt-blown plastic resin, and, more specifically, a novel method for evaluating physical properties are provided. When a particular plastic resin is processed by a melt-blown process, a stretching diameter value after the process of the plastic resin can be accurately derived from a physical property value measured using a specimen of the resin.

1 . A method for evaluating physical properties of a melt-blown plastic resin comprising:
 measuring a molecular weight distribution for a plastic resin specimen;   deriving a peak molecular weight value from the molecular weight distribution;   deriving a molecular weight distribution value (Mw/Mn) from the molecular weight distribution; and   predicting a stretching diameter of the plastic resin specimen manufactured from a melt-blown process using the peak molecular weight value and the molecular weight distribution value.   
     
     
         2 . The method according to  claim 1 , wherein
 when the molecular weight distribution of the plastic resin specimens is measured by GPC/SEC, the peak molecular weight value is a molecular weight value corresponding to a largest peak.   
     
     
         3 . The method according to  claim 1 , wherein
 the melt-blown process is performed under the temperature condition of 150° C. to 250° C.   
     
     
         4 . The method according to  claim 1 , wherein
 the melt-blown process is performed at a longitudinal stretch ratio of 100 times to 10,000 times.   
     
     
         5 . The method according to  claim 1 , wherein
 predicting the stretching diameter comprises:   deriving a polymer characteristic factor using Mathematical Formula 1 below.
   Polymer Characteristic Factor= a (MWD) b *( Mp ) c   [Mathematical Formula 1]
 
   in Mathematical Formula 1,   MWD is the molecular weight distribution value (Mw/Mn),   Mp is the peak molecular weight value,   a is 0.01 to 0.02,   b is 0.8 to 1.0, and   c is 0.20 to 0.22.   
     
     
         6 . The method according to  claim 5 , wherein
 predicting the stretching diameter comprises;   predicting a stretching diameter from the polymer characteristic factor using Mathematical Formula 2 below.
   Predicted Stretching Diameter= d *(Polymer Characteristic Factor)− e   [Mathematical Formula 2]
 
   in Mathematical Formula 2,   d is 1.01 to 1.02, and   e is 0.005 to 0.007.   
     
     
         7 . The method according to  claim 1 , wherein
 the peak molecular weight value is 10.000 g/mol to 150,000 g/mol.   
     
     
         8 . The method according to  claim 1 , wherein
 the molecular weight distribution value is 4 or less.   
     
     
         9 . The method according to  claim 1 , wherein
 the plastic resin has a number average molecular weight value (Mn) of 10,000 g/mol to 50,000 g/mol.   
     
     
         10 . The method according to  claim 1 , wherein
 the plastic resin has a weight average molecular weight value (Mw) of 10,000 g/mol to 200,000 g/mol.   
     
     
         11 . The method according to  claim 1 , wherein
 the plastic resin is a polypropylene resin.