Modified thermoplastic polyurethane rolling film and preparation method

Abstract

This present invention discloses a modified thermoplastic polyurethane (TPU) rolling film and relates to a preparation method thereof. The modified thermoplastic polyurethane (TPU) rolling film comprises: 100 parts by weight of TPU resin, 3 to 8 parts by weight of Thermoplastic polyolefin (TPO) resin, 5 to 10 parts by weight of Thermoplastic Silicone Vulcanizate (TPSiV) resin, 5 to 15 parts by weight of TPU color masterbatch, 0.5 to 1.5 parts by weight of antioxidant, 0.5 to 1.5 parts by weight of light stabilizer, 10 to 15 parts by weight of flame retardant, and 0.03 to 0.1 parts by weight of compound lubricant. This kind of rolling film has a uniform thickness and high surface gloss, and is yellowing resistant, abrasion resistant, flame retardant, and low-temperature resistant.

What is claimed is: 
     
         1 . A modified thermoplastic polyurethane (TPU) rolling film comprising:
 100 parts by weight of TPU resin,   3 to 8 parts by weight of Thermoplastic polyolefin (TPO) resin,   5 to 10 parts by weight of Thermoplastic Silicone Vulcanizate (TPSiV) resin,   5 to 15 parts by weight of TPU color masterbatch,   0.5 to 1.5 parts by weight of antioxidant,   0.5 to 1.5 parts by weight of light stabilizer,   10 to 15 parts by weight of flame retardant,   and 0.03 to 0.1 parts by weight of compound lubricant.   
     
     
         2 . The composition as claimed in  claim 1  wherein the TPU color masterbatch is prepared through an extruding and granulating process with TPU resin (DP6386A) used as carrier and toner. 
     
     
         3 . The composition as claimed in  claim 1  wherein the antioxidant is prepared by mixing β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecanol ester with N, N′-hexamethylene bis (3,5-di-tert-butyl-4-hydroxyphenyl propionamide) at a mass ratio of 1:1.5. 
     
     
         4 . The composition as claimed in  claim 1  wherein the light stabilizer is prepared by mixing 2-(2′-hydroxy-3′,5′-cumylphenyl) benzotriazole with 2-(2′-hydroxy-3′,5′-di-tert-amyl-phenyl) benzotriazole at a mass ratio of 1:2. 
     
     
         5 . The composition as claimed in  claim 1  wherein the flame retardant is prepared by mixing the organophosphate flame retardants with talcum powder of 5000 mesh at a mass ratio of 3:1. 
     
     
         6 . The composition as claimed in  claim 1  wherein the compound lubricant is prepared by mixing Erucamide with Oleic acid amide and Stearic acid at a mass ratio of 1:1:1. 
     
     
         7 . A process of preparing a modified TPU rolling film as claimed in  claims 1 - 6  comprising the following steps (1), (2), and (3):
 Step (1): adding all ingredients according to the compositions specified in  claims 1 - 6  into a stirring pot and stirring the mixture evenly at a high speed under a temperature between 85° C. and 100° C.; 
 Step (2): adding the mixture obtained from Step 1 into an internal batch mixer wherein the mixture is mixed for 3 to 5 minutes; 
 Step (3): plasticating, then extruding, and finally calendering the mixture obtained from Step (2) using a rolling turbine, an extruder, and a calender, respectively, to produce the film. 
 
     
     
         8 . A process according to  claim 7  wherein the temperatures for said plasticating, extruding, and calendering as described in Step (3) are maintained at 130° C. to 150° C., 130° C. to 150° C., and 140° C. to 160° C. respectively.