可调湿发泡缓冲包装材料的制备及性能研究

利用微波发泡法制备一种新型的功能性发泡缓冲包装材料,采用热场发射扫描电子显微镜及微机控制电子万能试验机对发泡淀粉基调湿材料的表观形貌及力学性能进行测试,探讨了淀粉含量、丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比、丙烯酸中和度及初始水含量对发泡淀粉基调湿材料性能的影响。结果表明:当淀粉含量为10.5%wt、丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比为4.5∶1、丙烯酸中和度为80%、初始水含量为10 g时,发泡淀粉基调湿材料的平台应力和缓冲系数分别达到0.363 MPa和3.618,单位体积吸收的能量为0.326 J/cm;发泡淀粉基调湿材料的吸/放湿率随淀粉含量的增加而降低,随丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比、丙烯酸中和度及初始水含量的增加而增加。

Preparation and properties of adjustable moisture foaming cushioning packaging materials

Here, foamed starch-based humidity control (FSHC) material was successfully made with the microwave foaming method. Then, a thermal field emission scanning electronic microscope and a microcomputer controlled electronic universal testing machine were used to detect apparent morphology and mechanical properties of FSHC material, effects of starch content, acrylic acid sodium-acrylate mixed solution and acrylamide mass ratio, acrylic acid neutralization degree and initial water content on properties of FSHC material were investigated. Results showed that the platform stress, cushioning coefficient and energy absorption unit volume of FSHC material reach 0.363 MPa, 3.618 and 0.326 J/cm, respectively when starch content is 10.5%, mass ratio of acrylic acid sodium-acrylate mixed solution to acrylamide is 4.5∶1, neutralization degree of acrylic acid is 80% and initial water content is 10 g; the moisture absorption / desorption rate of FSHC material decreases with increase in starch content, and increases with increase in mass ratio of acrylic acid sodium-acrylate mixed solution to acrylamide, neutralization degree of acrylic acid and initial water content.