疏水型纸浆纤维基隔热泡沫材料的制备及性能研究

Preparation and Properties of Hydrophobic Pulp Fiber-Based Insulating Foam Materials

中文关键词:  纸浆纤维  泡沫材料  疏水  隔热

英文关键词:pulp fiber  foam materials  hydrophobicity  thermal insulation

中文摘要:

      目的 开发具有疏水性、可回弹的生物降解型纸浆纤维基隔热泡沫。方法 以纸浆纤维为主要原料，十二烷基硫酸钠为发泡剂，聚乙烯醇为交联剂，阳离子型聚丙烯酰胺为黏结剂，经过打浆、搅拌发泡、滤水和干燥，制备纸浆纤维基泡沫材料。在此基础上，通过涂布聚乳酸/二氧化硅进行疏水改性，降低纸浆纤维基泡沫的吸湿性。 结果 性能测试表明，所得纸浆泡沫具有超低密度(0.044 3~0.069 8 g/cm³)、高孔隙率(95.22%~97.04%)、低热导率(0.071 1~0.081 1 W/(m.K))、优异的回弹性(1次压缩回弹率可达91.65%，10次压缩回弹率为87.77%)。聚乳酸/二氧化硅涂层显著提高了纸浆纤维基泡沫的隔热性能、疏水性(接触角为132.3°)。结论 疏水型纸浆纤维基泡沫可代替传统泡沫用于冷链包装，支持包装行业的可持续发展。

英文摘要:

      The work aims to develop a hydrophobic, resilient, and biodegradable pulp fiber-based insulating foam. With pulp fibers as the main raw material, sodium dodecyl sulfate as the foaming agent, polyvinyl alcohol as the cross-linking agent, and cationic polyacrylamide as the binder, the pulp fiber-based foam materials were prepared through a process involving pulping, mixing and foaming, drainage, and drying. To reduce the hygroscopicity of the pulp fiber-based foam, a hydrophobic modification was performed by coating with a polylactic acid/silica layer. The performance tests showed that the pulp fiber-based foam had ultra-low density (0.044 3-0.069 8 g/cm3), high porosity (95.22%-97.04%), low thermal conductivity (0.071 1-0.081 1 W/(m.K)), excellent resilience (resilience up to 91.65% after once compression, 87.77% after ten times of compression). The polylactic acid/silica coating significantly improved the thermal insulation, and hydrophobicity (contact angle 132.3°) of the pulp fiber-based foam. Hydrophobic pulp fiber-based foams can be used in cold chain packaging instead of traditional foams, supporting the sustainable development of the packaging industry.