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    Home > Coatings News > Paints and Coatings Market > Nano-silicon dioxide modified epoxy resins improve coating corrosion resistance

    Nano-silicon dioxide modified epoxy resins improve coating corrosion resistance

    • Last Update: 2020-11-19
    • Source: Internet
    • Author: User
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    Epoxy resin has excellent adhesion, chemical stability, mechanical properties and low shrinkage, easy processing and low cost advantages, in adhesives, construction, aerospace, coatings, electrical and electronic and advanced composites and other fields are widely used. However, because pure epoxy resin has a high cross-link structure, there are brittleness, fatigue resistance, poor impact toughness and other shortcomings, it is difficult to meet the requirements of the use of engineering technology, so that its application is limited. The modifiing of epoxy resin to improve its performance has become one of the hot topics of research
    in
    .there are many modified methods of
    epoxy resin, the traditional toughening method is to add tough polymers such as rubber elastomer or thermoplastic resin to epoxy resin, so that the toughness of its composite materials has been significantly improved, however, the method in improving the toughness of epoxy resin at the same time, but also make heat resistance and other degrees of reduction. As a result, people have been looking for new ways to change. In recent years, the emergence of nanomaterials and the development of nanotechnology have provided a new way for polymers to be modified. Inormeric nanomaterials have been increasingly used in polymer modified studies because of their excellent heat resistance and dimensional stability. NanoSiO
    2
    is an unsealed white powder with a large number of unsaturated residual bonds and hydroxyls in different bonding states in its molecular structure, which is a three-dimensional chain structure. This structure can be used in combination with certain groups of resin, which greatly improves the hardness and strength of the material. At the same time, nanoSiO
    2
    particles due to their small size, when the appropriate way to compound with the resin will be distributed in the polymer bond gap, which makes the strength, toughness, stretch of the polymer are greatly improved.
    foreign researchers have recently studied different sizes of gas-phase silicon dioxide modified epoxy resins by ultrasonic degradation to improve coating performance.
    used ultrasonic technology to successfully prepare nano (7nm) and micron (0.2-0.3m) silica-enhanced blank epoxy coatings (EC) in different contents. Scan electroscope analysis showed that nano and micro-silicon dioxide fillers were evenly dispersed in epoxy substations with a load of 3wt.. Ultrasonic waves can form permanent chemical bonding between epoxy resins and silicon dioxide particles through infrared spectroscopy and differential scanning heat (DSC). The quantitative analysis of infrared spectroscopy showed that the participation of nano-silicon dioxide in the chemical bonding of epoxy resin was higher than that of microns of silicon dioxide.
    compared test, the surface wetting, corrosion resistance, thermal stability and mechanical properties of the coated epoxy resin coating and gas phase silicon dioxide-epoxy composite coated steel plate were analyzed and evaluated.
    the contact angle test to measure the contact angle between the micro-silicon dioxide modified coating sample and the nano-silicon dioxide modified coating sample, the study showed that the coating modified by nano-silicon dioxide is better hydrophobic.
    test and thermal weight analysis show that nano-silicon dioxide improves corrosion resistance and thermal stability of epoxy coating compared with the modified coating of micron silica. Mechanical properties (i.e. scratch hardness, adhesion, impact strength and wear resistance) are improved in the same way.
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