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Characterization and evaluation of primer formulations for bonding silicone rubber to metal
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.porgcoat.2019.105513
A. Grard , L. Belec , F.X. Perrin

Abstract The aim of this study was to explore the chemistry and adhesive properties of industrial primer formulations used for bonding silicone elastomers on AA6061 aluminum alloy. The composition of different primer formulations was determined using conventional chemical analyses. Adhesion strength was measured using 90° peel test. The formulation comprising partially condensed vinyltrimethoxysilane (VTMS) and tetrapropoxysilane (TPOS) and titanium tetrabutoxide (TTB) catalyst showed a strong adhesion to metal but a low adhesive strength of the primer-elastomer interface. 29Si NMR spectroscopy results have shown that exchange reactions of alkoxy groups of VTMS, TPOS and TTB has occurred in the formulation. Surprisingly, one formulation was free of silane and consisted of a one-component addition curing system comprising a SiH oligosiloxane, a vinyl-PDMS with a Pt catalyst and silica filler. This formulation enabled high cohesive strength of the primer and primer-elastomer interphase but it showed low adhesion to the metal. The more complex formulation containing a mixture of silanes (vinyltriethoxysilane, methyltriethoxysilane and tetraethoxysilane), a vinyl silicone gum, a hydroxy-terminated PDMS and silica filler resulted in the highest adhesive strength with 100 % cohesive failure in the elastomer. We found that the reinforcement effect of silica filler plays an important role in the promotion of adhesion.

中文翻译:

用于将硅橡胶与金属粘合的底漆配方的表征和评估

摘要 本研究的目的是探索用于在 AA6061 铝合金上粘合有机硅弹性体的工业底漆配方的化学和粘合性能。使用常规化学分析确定不同底漆配方的组成。使用90°剥离试验测量粘合强度。包含部分缩合乙烯基三甲氧基硅烷 (VTMS) 和四丙氧基硅烷 (TPOS) 以及四丁氧基钛 (TTB) 催化剂的配方显示出对金属的强粘附力,但底漆-弹性体界面的粘附强度低。29Si NMR谱结果表明,配方中VTMS、TPOS和TTB的烷氧基发生了交换反应。令人惊讶的是,一种配方不含硅烷,由包含 SiH 低聚硅氧烷的单组分加成固化体系组成,带有 Pt 催化剂和二氧化硅填料的乙烯基 PDMS。这种配方使底漆和底漆-弹性体界面具有高内聚强度,但对金属的附着力低。包含硅烷(乙烯基三乙氧基硅烷、甲基三乙氧基硅烷和四乙氧基硅烷)、乙烯基硅橡胶、羟基封端的 PDMS 和二氧化硅填料的混合物的更复杂配方导致最高的粘合强度,弹性体的内聚破坏率为 100%。我们发现二氧化硅填料的补强作用在促进附着力方面起着重要作用。甲基三乙氧基硅烷和四乙氧基硅烷)、乙烯基硅橡胶、羟基封端的 PDMS 和二氧化硅填料导致最高的粘合强度,弹性体的内聚破坏率为 100%。我们发现二氧化硅填料的补强作用在促进附着力方面起着重要作用。甲基三乙氧基硅烷和四乙氧基硅烷)、乙烯基硅橡胶、羟基封端的 PDMS 和二氧化硅填料导致最高的粘合强度,弹性体的内聚破坏率为 100%。我们发现二氧化硅填料的补强作用在促进附着力方面起着重要作用。
更新日期:2020-03-01
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