Preparation And Studies On Modification Of High Wear-Resistance NanoSiO₂/Polyacrylate Composite Coating

Acrylic resin is extensively applied in electronic products coatings and some other fields of light industry, instrument, architecture, rubber and paper because of its good properties of gloss retention, color retention, heat resistance and corrosion resistance. But because of limitation of acrylate coatings structure, some shortcomings , for example hardness, Wear-resistance, is in the application. SiO₂ nanoparticle have many good properties of strong hardness, abrasive resistance, corrosion resistance and acid fastness. The combination of SiO₂ nanoparticle with acrylic resin to nano-composite coating have been proved to be an effective way to improve the mechanical property of coating film.Material's quantity and properties was effected by nanoparticle has small size, high specific surface area, surface energy and activity. In this article, the modification of nano-SiO₂ was studied with silane coupling agent. The results show that nano-SiO₂ modified has good dispersibility and stability. The modification effect was best when the content was KH550 9%, KH560:11%, KH570:11%.Nano-SiO₂/acrylate composites was prepared by mechanical blending and formation in-situ. The friction- and wear-resistance of composites was studied with different silane coupling agent, content and process. The effect was friction- and fear-resistance investigated with nanoparticle. The results dedicated that:(1)The friction- and wear-resistance was improved, the wear rate was decreased and the adhesion reduced.(2)The friction- and wear-resistance was improved first and then decreased as the content of nanosilica increased. When 3% nano-SiO₂ was filled, The friction- and wear-resistance of the composite reached best. (3)The results of formation in-situ was better than mechanical blending. At last, after nanosilica filled, the mainly abrasion mechanism of the composites turn adhesive to abrasive wear.The hardness, adhesion, alcohol resistance, DSC and RCA of coating were investigated in different nano-SiO₂ content and methods. The results indicated that the properties of coating were improved except adhesion with Nano-SiO₂ filled and the formation in-situ is better than the other method. A two-component acrylate coating was prepared through molecular design. the properties of coating was investigated with the content of epoxy group increased. The results show that more time is needed on coating dry. The hardness, wear and alcohol resistance turn better and better with the increase of the epoxy group content. When 15% GMA was added, the comprehensive properties of the composites reached the requirements on actual using...