| Abstract:The paper addresses the challenge of balancing air permeability and mechanical properties in medical packaging paper, as well as the issues of paper tearing and debris generation during the peeling process. Using high-air-permeability base paper as the substrate, the study investigates impregnation and reinforcement with a modified acrylic copolymer latex, aiming to preserve air permeability, enhance mechanical properties, and modulate surface hydrophilicity and hydrophobicity. The results indicate that the range of adjustment for impregnation solution concentration was 7.8 times that of the impregnation temperature and 12.3 times that of the impregnation time. Microscopic observations revealed that the latex coated the fiber surfaces and filled the pores, effectively regularizing the internal pore distribution. This led to significant improvements in the paper’s air permeability and pore structure uniformity, as well as a significant reduction in the paper’s coefficient of variation. Based on a comprehensive analysis of air permeability, mechanical properties, and hydrophilic/hydrophobic properties, the optimal latex application rate was determined to be 12~15 g/m². Paper treated with this latex coating simultaneously meets the enterprise standards for Cobb 60 value, air permeability, tensile strength, bursting strength, and tear resistance. |