A reversible water-based electrostatic adhesive.
A reversible water-based electrostatic adhesive.
复制标题
一种可逆水基静电粘合剂。
DOI：
10.1002/anie.202310750
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发表时间：
2024
期刊：
影响因子：
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通讯作者：
Sierra-Romero A
中科院分区：
文献类型：
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作者：
Sierra-Romero A
商业粘合剂通常分为两类：结构性粘合剂或压敏粘合剂。结构胶依赖于固化过程中形成的共价键，并提供高拉伸强度，而压敏粘合剂使用物理粘合提供较弱的粘合力，但对用户来说相当方便。在这里，提出了一类新的粘合剂，也是可逆的，具有介于压敏粘合剂和结构粘合剂之间的粘合强度。含有带相反电荷的聚电解质的互补水基制剂形成静电键，该静电键可通过浸入低或高pH水性环境中而逆转。这种静电粘合剂具有有利的特性，即它对低能量表面如聚丙烯表现出良好的粘合性。此外，它是通过商品材料、苯乙烯和丙烯酸丁酯的乳液共聚来生产的，这使得它便宜并打开了工业生产的可能性。生物基材料也被整合到配方中，以进一步提高可持续性。此外，与其他水基胶不同，粘合力在潮湿环境中不会显着降低。由于此类静电粘合剂不需要机械分离，因此它们适用于大规模回收，例如，瓶子标签或食品包装。该粘合剂还适用于汽车零件和电子产品等不同领域的部件拆卸。
Commercial adhesives typically fall into two categories: structural or pressure sensitive. Structural glues rely on covalent bonds formed during curing and provide high tensile strength whilst pressure‐sensitive adhesives use physical bonding to provide weaker adhesion, but with considerable convenience for the user. Here, a new class of adhesive is presented that is also reversible, with a bond strength intermediate between those of pressure‐sensitive and structural adhesives. Complementary water‐based formulations incorporating oppositely charged polyelectrolytes form electrostatic bonds that may be reversed through immersion in a low or high pH aqueous environment. This electrostatic adhesive has the advantageous property that it exhibits good adhesion to low‐energy surfaces such as polypropylene. Furthermore, it is produced by the emulsion copolymerization of commodity materials, styrene and butyl acrylate, which makes it inexpensive and opens the possibility of industrial production. Bio‐based materials have been also integrated into the formulations to further increase sustainability. Moreover, unlike other water‐based glues, adhesion does not significantly degrade in humid environments. Because such electrostatic adhesives do not require mechanical detachment, they are appropriate for the large‐scale recycling of, e.g., bottle labels or food packaging. The adhesive is also suitable for dismantling components in areas as varied as automotive parts and electronics.