Effect of thermal processing on the integrity of polyurea microcapsules for underwater adhesives

IF 3.2 3区 材料科学 Q2 ENGINEERING, CHEMICAL
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引用次数: 0

Abstract

Adhesives that rely on a curing mechanism struggle to function in underwater environments due to detrimental interactions with water. One strategy to overcome this involves protecting sensitive components in mechanically responsive microcapsules. In this way, a two-part adhesive can be achieved via a single mixture, applied as one would apply a pressure sensitive adhesive. This work focused on improving polyurea microcapsule shell integrity, specifically focusing on the effect of additional thermal processing. The improved microcapsule shells displayed limited payload leakage with only an 8 % loss in pot life compared to the base isocyanate resin alone. A mixture of optimized microcapsules and isocyanate resin was evaluated against a wide range of substrates and conditions, including dry and wet environments. When microcapsules were intentionally ruptured to release the catalyst and crosslinker payload, the microcapsule-isocyanate mixture had improved adhesive strength (506 %) compared to the base isocyanate resin without microcapsules.

Abstract Image

热加工对水下粘合剂用聚脲微胶囊完整性的影响
依靠固化机制的粘合剂在水下环境中难以发挥作用,原因是与水发生有害的相互作用。克服这一问题的策略之一是在机械反应微胶囊中保护敏感元件。这样,就可以像使用压敏胶一样,通过单一混合物实现双组分粘合剂。这项工作的重点是改善聚脲微胶囊外壳的完整性,特别是额外热处理的效果。改进后的微胶囊外壳显示出有限的有效载荷泄漏,与单独的基础异氰酸酯树脂相比,仅损失了 8% 的罐装寿命。针对包括干燥和潮湿环境在内的各种基质和条件,对优化微胶囊和异氰酸酯树脂的混合物进行了评估。当故意使微胶囊破裂以释放催化剂和交联剂有效载荷时,与不含微胶囊的基础异氰酸酯树脂相比,微胶囊-异氰酸酯混合物的粘合强度提高了 506%。
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来源期刊
International Journal of Adhesion and Adhesives
International Journal of Adhesion and Adhesives 工程技术-材料科学:综合
CiteScore
6.90
自引率
8.80%
发文量
200
审稿时长
8.3 months
期刊介绍: The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.
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