聚乙烯醇基复合调湿材料的制备及其对卷烟湿度的调节性能

Preparation of Polyvinyl Alcohol-based Composite Moisture-controlling Materials and Their Regulation Performance for Cigarette Humidity

用聚丙烯酸、硅藻土和CaCl_(2)对聚乙烯醇化学改性,制备了聚乙烯醇基复合调湿材料。结果表明,聚丙烯酸对聚乙烯醇微交联后材料的疏水性增加,CaCl_(2)改性后材料的亲水性随CaCl_(2)的加入而增加。调节不同分子量PVA的比例能有效减少材料的发粘现象。在相对湿度为30%~80%条件下放置24 h,烟丝含水率保持在11.35%~12.75%,在相对湿度为30%~80%条件下放置48 h,复合调试材料可使烟丝含水率保持在10.93%~13.30%;证明该调湿材料能有效调节烟盒内部湿度,稳定烟丝含水率,保持卷烟口感良好。

Polyvinyl alcohol(PVA)was chemically modified by polyacrylic acid,diatomite and CaCl_(2),and hence the PVA-based composite moisture-controlling materials were prepared.The results indicated that the hydrophobicity of the chemical modifying polyacrylic acid into PVA increased after the micro-cross-linking,while the hydrophilicity of the CaCl_(2)modified materials increased with the addition of CaCl_(2).Adjusting the ratio of PVA with different molecule weight was able to effectively reduce the viscosity of the resulting materials.As the relative humidity was kept at 30%~80%for 24 h,the moisture content of the tobacco was in the range of 11.35%~12.75%.As the relative humidity was 30%~80%for 48 h,the composite material kept the moisture content of the tobacco at 10.93%~13.30%.As a result,the present composite moisturecontrolling materials was able to effectively regulate the internal humidity in the cigarette box,stabilize the moisture content of the tobacco,and make cigarettes keep good taste.