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Preparation of one-component addition-cure liquid silicone rubber coating with enhanced storage stability and bond strength

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Abstract

It is of great interest and challenge to simultaneously improve the storage stability and bond strength of one-component addition-cure liquid silicone rubber (OLSR) coating for electronic circuit board. In this work, we proposed an efficient approach to address this issue by incorporating both cyano-modification platinum catalyst (CN–PT) and urethane-containing poly(hydromethylsiloxane) (N-PHMS) into OLSR coating using a mechanical mixer. The CN–PT and N-PHMS were synthesized through thermal polymerization reaction and hydrosilylation reaction, respectively. The OLSR coating containing 0.3 phr CN–PT and 3 phr N-PHMS showed the best properties, with a tensile bond strength of 1.63 MPa, a storage period > 180 d at 25 °C, and a curing rate < 2 h at 80 °C. The salt-spray resistance and continuous power-on performance of OLSR coating were also improved, compared with pure OLSR coating. The synergism of CN–Pt and N-PHMS on the enhancement of both the storage stability and bond strength of OLSR coating was also explored. Our findings exhibited great potentials for fabricating OLSR coating with excellent long-term stable service performance including high storage stability and protective ability.

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Authors and Affiliations

  1. Key Lab for Fine Processing of Resources and Advanced Materials of Hunan Province, Hunan Normal University, Changsha, 410081, Hunan, China

    Chaohua Li, Shengpei Su, Bikui Wang & Jijia Zhou

  2. Hunan Key Laboratory of Near-Space Meteo-Ballon Materials and Technology, Zhuzhou, 412000, Hunan, China

    Chaohua Li

  3. National and Local Joint Engineering Laboratory for New Petro-Chemical Materials and Fine Utilization of Resources, Hunan Normal University, Changsha, 410081, Hunan, China

    Shengpei Su, Bikui Wang & Jijia Zhou

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  1. Chaohua Li
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Correspondence to Shengpei Su.

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Li, C., Su, S., Wang, B. et al. Preparation of one-component addition-cure liquid silicone rubber coating with enhanced storage stability and bond strength. J Mater Sci: Mater Electron 32, 21052–21064 (2021). https://doi.org/10.1007/s10854-021-06597-9

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