单晶Sb粉末改性PLA复合薄膜的制备与性能研究

本文采用改性氢化蓖麻油、聚酰胺蜡、聚乙烯蜡作为PERC背面银浆的触变剂，研究了不同种类的触变剂对PERC背面银浆性能的影响。采用上述三种触变剂制备的有机载体搭配银粉、自制玻璃粉配制成PERC背银浆料，并利用旋转粘度计、流变仪、印刷机等工具分别测试了PERC背面银浆的粘度、触变性、储存稳定性、印刷湿重、漏浆量等性能。结果表明：改性氢化蓖麻油对PERC背面银浆的粘度、触变性、储存稳定性的影响最明显，聚酰胺蜡居中、聚乙烯蜡最弱。有机载体中加入1 %的触变剂可以使PERC背面银浆粘度增大1500-20000 mPaS，印刷湿重增大0.001-0.019 g/片，漏浆量下降明显，下降幅度达到0.57-2.22 g/片，浆料储存6 个月后仍旧能够保持流变状态的稳定。

Study on preparation and properties of monocrystalline Sb powder modified PLA composite membranes

In this paper, modified hydrogenated castor oil, polyamide wax and polyethylene wax were used as thixotropic agents of PERC back silver paste. The effects of different kinds of thixotropic agents on the properties of PERC back silver paste were studied.The above three thixotropic agents were used to prepare organic carriers,and PERC back silver pastes were prepared by combining the organic carrier,silver powder and self-made glass powder.The viscosity, thixotropy, storage stability, wet-weight and paste leakage of PERC back silver paste were tested by rotary viscometer, rheometer and printing press.The results show that the modified hydrogenated castor oil has the most obvious effect on the viscosity, thixotropy and storage stability of the PERC back silver paste, the polyamide wax is in the middle and the polyethylene wax is the weakest.After 1% thixotropic agents were added in the organic carrier, the viscosity of the PERC back silver paste can increase by 1500-20000 mPaS, the printing wet weight increase by 0.001-0.019 g/ piece, and the leakage of the paste decrease by 0.57-2.22 g/ piece. After 6 months of storage, the paste can still maintain a stable rheological state.