Water based systems: nanotechnologies and high-tech hybridization strategies
Water based systems are safe and environmentally friendly. Their non-toxic and non-flammable nature reduces harmful emissions and increases worker safety.
Responsibility in human and environmental care lead to the development of waterborne polymer, as an excellent replacement of traditional solvent based paints. Waterborne polymers exhibit a wide range of advantages, such as ﬂexibility, low temperature resistance, toughness, UV resistance and outstanding abrasion resistance. But the quality of the paint is strongly inﬂuenced by its water barrier properties.
Water penetration into the paint leads to growth of fungi and loss of adhesion between the paint and underlying substrate. In addition, water is the main carrier for the penetration of the aggressive ions originating from rain and water soluble gases such as CO2 and SO2 which both cause a negative effect on the protection of the substrate. Thus, control of waterproofing properties in the paint is critical to achieve its protecting characteristics.
Water based polymers are a two phases systems, in which there is an equilibrium among molecules that are lipophilic “fat-loving” in one phase and hydrophilic “water-loving” in the other.
The polymer phase consist of submicron-sized spheres: a 200-gram sample of an emulsion generally contains more spheres than there are stars in the Milky Way.
A waterborne dispersion is usually achieved by introduction of the “internal emulsiﬁers”. Internal emulsiﬁer is a hydrophilic monomer which is inserted int the backbone of the polymer chain during the chemical synthesis. The ionic hydrophilic groups in the emulsiﬁer will provide surface charge to disperse hydrophobic polymer segments in water, creating solid polymer particles dispersed in water. However, the hydrophilic nature of ionic groups or water-soluble segments of waterborne type polymer could poses some problems associated with water barrier.
Various methods have been adopted by Borma Wachs to improve water resistance and hydrophobic property of waterborne polymer via copolymerization with special monomers. Strong hydrophobic segments, are introduced into the polymer macromolecules as short side-chain. The modiﬁed waterborne co-polymer combines low surface tension, high-hydrophobicity and high weathering resistance as well as maintain the original physical and mechanical properties of waterborne polymer.
Copolymer and hyperbranched polymer are used in the formation of core shells of oil in water, in which the hydrophile block serves as the core, while the hydrophobic block forms the shell. In the micellar core: reactive, liquid and renewable and biodegradable plant oils are emulsified.
> HYBRID SYSTEM
In the past few years, scientists have found microplastics in the environmental. And there’s growing concern about the potential health risks they pose to humans.
Some studies are suggesting that there are more microplastics on land than there are in oceans, but the research on land freshwater is still at the beginning.