Improvements in manufacturability, bonding strength, and curing efficiency of a silicone adhesive

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Two-component room temperature vulcanizing silicone adhesive RTV566 with a lower elastic modulus has been widely used in precision optomechanical products such as remote sensors and aerospace infrared cameras. However, the silicone adhesive is of poor manufacturability due to its extremely high viscosity, and the bonded joint usually exhibits low bonding strength and requires a long curing time. This paper investigates a way to improve both the adhesion strength and curing efficiency of Invar alloy and optical glass with RTV566 through single-lap experiments. It is found that adding small amounts of acetone and water can significantly reduce the viscosity, enhance the bonding strength, and shorten the curing time. The viscosity can be reduced by 63.4 % and the bonding strength can be improved by 136.4 % with the weight ratio of adhesive to acetone being 20:2. Moreover, a little amount of water in the weight ratio of 100:10:0.1 (adhesive: acetone: water) can shorten the curing time from 7 days to 4 days without harms to the bonding strength and elastic modulus. As to the mechanism, the silicone adhesive can be dissolved by acetone and its sulfuration reaction can be enhanced by water, resulting in good manufacturability and high curing efficiency. This work contributes a novel and easy-to-use method to greatly improve the performances of the bonding process of precision optical structures.

提高硅酮粘合剂的可制造性、粘合强度和固化效率
具有较低弹性模量的双组分室温硫化硅酮粘合剂 RTV566 已广泛应用于遥感器和航空红外摄像机等精密光机械产品。然而,这种硅胶粘合剂由于粘度极高,可制造性差,粘接接头通常粘接强度低,固化时间长。本文通过单圈实验研究了一种用 RTV566 提高因瓦合金和光学玻璃的粘接强度和固化效率的方法。实验发现,添加少量丙酮和水可显著降低粘度,提高粘接强度,缩短固化时间。粘合剂与丙酮的重量比为 20:2,粘度可降低 63.4%,粘合强度可提高 136.4%。此外,以 100:10:0.1(粘合剂:丙酮:水)的重量比加入少量水,可将固化时间从 7 天缩短至 4 天,而不会影响粘合强度和弹性模量。在机理方面,丙酮可溶解硅酮粘合剂,水可促进其硫化反应,因此具有良好的可制造性和较高的固化效率。这项工作提供了一种新颖易用的方法,大大提高了精密光学结构粘接工艺的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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