Patent ID: 9206339
Filing Date: 2015-12-08
Classification: C08L,C09J,H01L,Y02E

Abstract:
1. A method of preparing a polyester/polyolefin hot-melt adhesive for use in a solar cell bus bar, comprising the steps of: 1) sequentially adding 2,6-naphthalenedicarboxylic acid, ethylene glycol and a titanium-based catalyst, in a predetermined ratio, into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser to initiate an esterification reaction under a normal pressure at a temperature of 200° C. to 245° C., and terminating the esterification reaction when an amount of water resulting therefrom reaches 92% to 96% of an amount of calculation; 2) performing a polycondensation reaction at a temperature of 245° C. to 265° C. for 1.3 h to 1.8 h in vacuum with a pressure of 500 Pa to 650 Pa to result in a polyethylene naphthalate (PNT) with a weight-average molecular weight of 16,000 to 20,000; and 3) melt-blending the PNT resulting from step 2) with a compatibilizer and a low-density polyethylene (LDPE) to produce the hot-melt adhesive for use in a solar cell bus bar, wherein the 2,6-naphthalenedicarboxylic acid and the ethylene glycol are in a molar ratio of 1:1.8; wherein the hot-melt adhesive consists of 4.7% to 14% by weight of the PNT, 78% to 89% by weight of the LDPE, and 5.7% to 8.2% by weight of the compatibilizer; wherein the LDPE exhibits a melt flow rate (MFR) of 2.0 g/10 min to 3.0 g/10 min at 190° C./2.16 kg; and wherein the compatibilizer is an LDPE grafted by maleic anhydride at a grafting ratio of 1.0% to 2.0% and exhibits an MFR of 2.0 g/10 min to 3.0 g/10 min at 190° C./2.16 kg.