Encapsulation of linseed oil in graphene oxide shells for preparation of self-healing composite coatings
Graphene oxide was employed as the stabilizer of Pickering emulsions.
Self-healing microcapsules were filled with a glue-like chemical that can repair damage and recover the original functions of materials. Graphene oxide (GO) was employed as the stabilizer of Pickering emulsions, and then the microcapsule shells were built upon the self-assembly of GO at oil/water interfaces. Linseed oil was encapsulated in the microcapsules as the healing agent.
Stabilization of the Pickering emulsionsSeveral important factors were studied that affected the stabilization of the Pickering emulsions and the formation of the integral microcapsules, such as the pH value of GO aqueous solution, the GO/linseed oil mass ratio and the effect of surfactant. Chemical stitching of GO sheets by polyetheramine molecules were employed to enhance the chemical stability of the microcapsules. The waterborne polyurethane (PU) composite coatings containing 10 wt% microcapsules autonomously healed a scratch with 20 μm in width. After healing, the impedance modulus of the composite coatings was four orders of magnitude higher than neat PU. The study is published in: Progress in Organic Coatings Volume 129, April 2019, Pages 285-291.
Five facts on the water-borne coatings marketBy JudiIn International Shows, materials science, Paint Technology Posted April 17, 2019
Water-based formulations are among the top trends in the coatings industry. How is the situation at the market currently? We have gathered five facts.
Water-borne coatings are developed as an alternative to solvent- borne coatings that contains high amount of VOCs, less eco-friendly in nature and causing several health issues. On the other hand, water-borne coatings are manufactured through green technology which is more eco-friendly in nature and adheres to the safety regulations proposed by REACH and other government organisations.
The global water-borne coatings market size was about EUR 62.4 billion in 2017 and is projected to reach about EUR 82.7 billion by 2022, at a CAGR 5.7% in terms of value.
The market by regions
Asia Pacific has been a bright spot in the global water-borne coatings market in the backdrop of the overall slowdown in global economic development.
Architectural coatings biggest segment
Architectural is the largest application of water-borne coatings. Rapid urbanisation, rising disposable income, and growing GDP in Asia Pacific resulted into increased demand for residential, commercial, and industrial infrastructure followed by renovation/re-paint of residential and commercial buildings.
Forecasts for the coming years remain positive, driven in particular by rising demand for environmentally friendly technologies.
What are the most important resins?
There has been a shift toward water-borne acrylics, especially in the automotive basecoats due to environmental concerns.