A kind of silicon dioxide-containing composite hydroxyl acrylic acid dispersion and its preparation method and application
A technology for compounding hydroxyacrylic acid and hydroxyacrylic acid, applied in coatings, anti-corrosion coatings, etc., can solve problems such as poor blending stability, and achieve the effects of product stability, anti-corrosion performance improvement, and excellent friction resistance.
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Embodiment approach 1
[0039] In order to improve the stability of acrylic acid dispersion, apply it to coatings and be suitable for industrial development, the invention provides a composite hydroxyl acrylic acid dispersion containing silica, which comprises the following components: hydroxyl acrylic resin and Janus silica.
[0040] One side of Janus silica is modified by hydrophobic groups, and one side is unmodified; Janus silica is mainly composed of silica sol modified by KH560 or / and dodecyl trimethoxysilane.
[0041] One side of Janus silica is connected with hydroxyl group, and the other side is a hydrophobic group modified by KH560 or / and dodecyl trimethoxysilane. Janus silica can improve the stability of hydroxyl acrylic acid dispersion containing silica, especially the thermal storage stability.
[0042] Preferably, the components are 180-220 parts by weight of hydroxyacrylic resin and 5-20 parts by weight of Janus silica; It also includes 150 ~ 250 parts of water.
[0043] Preferably, 20...
Embodiment approach 2
[0045] The invention provides the preparation method of the silica containing composite hydroxyl acrylic acid dispersion, which comprises the following steps: dispersing the hydroxyl acrylic resin in Janus silica dispersion to obtain the silica containing composite hydroxyl acrylic acid dispersion. Compared with the traditional cold splicing method, the product is more stable; Compared with organic-inorganic hybrid method, it is more simple, efficient and easy to control; When used in paint film, it has high hardness and better salt spray resistance.
[0046] Among them, hydroxy acrylic resin and solvent were dispersed by phase inversion method.
[0047] Specifically, it includes the following sequential steps:
[0048] S1 add hydroxyl acrylic resin into N-N dimethyl ethanolamine for neutralization and heat it to 80 ~ 95 ℃;
[0049] Among them, N-N dimethyl ethanolamine is added into hydroxy acrylic resin under stirring at 250rpm, and the hydroxy acrylic resin is heated and kept w...
Embodiment approach 3
[0075] The invention also provides the application of the composite hydroxyl acrylic acid dispersion containing silica as a coating. Among them, the components in the coating are as follows by weight:
[0076] Main agent:
[0077]
[0078]
[0079] Curing agent:
[0080] 20 ~ 25 parts of NCO curing agent;
[0081] Before use, the main agent and curing agent shall be fully mixed and evenly mixed, and the galvanized sheet shall be sprayed, and the wet film thickness shall be controlled at 200 μ m. Bake at 80 ℃ for 30min for curing.
[0082] In order to better understand the above technical scheme, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the invention are shown in the accompanying drawings, it should be understood that the invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embo...
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