Properties of KH550 and Hydroxyl Silicone Oil Co-modified Epoxy Resin and Its Mg-rich Primer

doi:10.11902/1005.4537.2021.205

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 590-596 DOI: 10.11902/1005.4537.2021.205

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Properties of KH550 and Hydroxyl Silicone Oil Co-modified Epoxy Resin and Its Mg-rich Primer

GE Chengyue¹^,², LUO Xiangping³(

), WANG Jing¹, DUAN Jizhou¹, WANG Ning¹, HOU Baorong¹

^1.Key Laboratory of Marine Environmental Corrosion and Bio-Fouling of Chinese Academy of Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
^2.Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
^3.Beijing Gas Group Company Limited, Beijing 100035, China

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Abstract

Epoxy resin (E-20) was co-modified by silane coupling agent (KH550) and hydroxyl silicone oil through a two-step reaction process. The ethoxy group (coming from KH550) was introduced into E-20 by addition reaction of primary amine to increase the activity, thereby the grafting efficiency of E-20 with hydroxyl silicone oil was improved. The mechanism of two-step reaction process and the effect of reactant ratio on properties of modified resin were studied in detail through IR, GPC test, stability analysis and DSC test so that to optimize modification parameters. The results show that the appropriate ratio of reactants was E-20: hydroxyl silicone oil: KH550=10:1.5:0.5 (mass ratio). Further, the Mg-rich primer made of the modified resin was prepared and then applied on Al-alloy, afterwards the protective performance for the Mg-rich primer coated Al-alloy was assessed through salt spray testing and aging testing. The results show that this coating has high adhesion and good flexibility, as well as excellent salt spray resistance and aging resistance.

Key words: Mg-rich coating graft polymerization modification of epoxy resin protection of Al-alloy

Received: 17 August 2021

ZTFLH:

TG174

Fund: National Key R&D Program of China(2019YFC0312103);Innovation and Development Fund of South China Sea Institute of Ecological Environment Engineering Innovation, CAS(ISEE2018YB05);National Natural Science Foundation of China(42006046)

Corresponding Authors: LUO Xiangping E-mail: luoxiangping@bigas.com

About author: LUO Xiangping, E-mail: luoxiangping@bigas.com

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Cite this article:

GE Chengyue, LUO Xiangping, WANG Jing, DUAN Jizhou, WANG Ning, HOU Baorong. Properties of KH550 and Hydroxyl Silicone Oil Co-modified Epoxy Resin and Its Mg-rich Primer. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 590-596.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.205 OR https://www.jcscp.org/EN/Y2022/V42/I4/590

Fig.1 Technical scheme of modification for E-20

Fig.2 FT-IR spectrum of intermediate product & reactant (a) and final product (b)

Fig.3 GPC curve of intermediate product (a) and the final product (b)

Fig.4 FT-IR spectrum of different modified products

Fig.5 GPC curves and fitting values of different modified products

Table 1 Storage stability of different modified resins

Fig.6 DSC curves and fitting values of different modified resin

Fig.7 Macroscopic morphotogies of original (a) salt-spraying (b) and ageing test (c) of coating prepared by different modified resins (a1-c1) 10:2:0.5, (a2-c2) 10:1.5:0.5, (a3-c3) 10:1:0.5

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