载银抗菌ABS塑料的研制

PREPARATION OF ABS ANTIBACTERIAL PLASTICS CONTAINING SILVER

先将载银无机抗菌剂进行表面处理,再与ABS混合经双螺杆挤出得到高浓度的抗菌母粒,然后添加到ABS中注塑抗菌塑料试样。研究结果表明,变色抑制剂可有效地防止抗菌ABS塑料的变色,提高抗菌性能;随着抗菌母粒的增加,抗菌ABS塑料的抗菌性能提高,当抗菌母粒的添加量为4%时,即抗菌剂在ABS塑料中的含量为1%时,抗菌ABS塑料的性价比最佳;经表面处理后的抗菌剂在ABS中分布均匀,无团聚现象,与ABS基体树脂的相容性好;添加4%抗菌母粒的抗菌ABS塑料对大肠杆菌、金黄色葡萄球菌、绿脓杆菌、鼠伤寒沙门氏菌的抗菌率都达到95%以上;该抗菌塑料经过55℃的去离子水浸泡16h后,抗菌性能下降较小,具有长效抗菌性能;其力学性能与空白ABS塑料相当,并且经过120h的光老化后的平均色差为3.27,光老化性能较好。

High content antibacterial masterbatches were prepared by melt blending ABS and surface-modified inorganic antibacterial agents containing silver with twin screw extruder, and added into ABS to prepare ABS antibacterial plastics. The experimental results showed that the addition of off-color inhibitor could efficiently prevent ABS antibacterial plastics from color deterioration, and raised antibacterial activity. The antibacterial activity of ABS antibacterial plastics improved with the increase of the content of antibacterial masterbatches, ABS antibacterial plastics showed high rate of properties to prices by adding 4% antibacterial masterbatches, here the conten of the surface-modified inorganic antibacterial agents were 1%. Surface-modified inorganic antibacterial agents were well dispersed in ABS, and had favorable compatibility with ABS by adding 4% antibacterial masterbatches, the antibacterial rates were all above 99% towards escherichia coli, staphylococcus aureus, pseudomonas aeruginosa and salmonella typhi. The antibacterial activities of the antibacterial plastics didn′t decline obviously with the antibacterial plastics diping in 55℃ deionized water for 16 h. The antibacterial plastics had long-acting antibacterial properties and antibacterial agents had almost no effect on mechanical properties of ABS in the experimental range. The ABS antibacterial plastics showed good light-resistant property after 120 h light ageing test with the aberration of 3.27.