Change: China's paint industry water-based paint technology upgrade

With the intensity of environmental protection policy, the paint industry to develop technology towards environmental protection direction.
research and development of water-based coatings, high solid sub-coatings, powder coatings and UV-cured coatings has been increasing. At the same time, pay attention to improve the performance of coatings, expand the field of applications, in marine coatings, automotive coatings, construction and floor coatings and other fields have made significant progress
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In 2015, the Ministry of Finance and the State Administration of Taxation imposed a consumption tax on coatings, which is an opportunity for water-based coatings, the industry on water-based resins, water-based additives and water-based additives research and development efforts significantly increased, new technologies continue to emerge, applications continue to expand.
-based
carbon nanotubes have high elastic mods, large long diameter ratios, excellent electrical properties and high temperature resistance. The modified water-based polyurethane with carbon nanotubes can effectively improve the electrical and electrical properties of water-based polyurethane coating. Researchers from Anhui University obtained MWNTs-SDBS with sodium sulphate (SDBS) modified multi-wall carbon nanotubes (MWNTs), mixed with solutions, and prepared water-based polyurethane/SDBS modified multi-walled carbon nanotube composites. The results show that carbon nanotubes are evenly dispersed in water-based polyurethane, which obviously improves the electromemic and conductive properties of water-based polyurethanes, and reduces the crystallization performance of the soft phase of polyurethane.
Chinese Academy of Forecology Wu Guo, etc., using cellulose nanocrystalline sacs (CNW) of water dispersion, respectively, the CNW water suspension dispersed in the water-based epoxy resin polyol and water-based terpene-based epoxy resin dispersion, the study shows that: the viscosity of the composite system with the increase of CNW additions, The change of particle size peak area is directly related to the addition of CNW, CNW can be distributed evenly and disorderly in the water-based resin system, with the increase of CNW addition, the tensile strength and tensile modulus of the composite coating film is significantly improved, the fracture elongation rate is decreased, and the addition of CNW can improve the hydrophobicity of the composite coating surface.
solvent-based polyurethane, water-based polyurethane is not resistant to water, weather, solvent resistance and initial viscosity due to the presence of hydrophory groups in the molecular chain. To this end, Chongqing Zhongkolitai Zhou Jing and other use of sodium ethyl sulfonate in three (methylene methyl) phenol (AAS) catalytic reaction with epoxy resin E44, synthesis of epoxy modified new amine hydrophobic chaining agent, explore the impact of different reaction times. The conditions for AAS to fully open the E44 were determined. Epoxy-modified water-modified polyurethane emulsions were prepared with polyuric diacids, polyoxypropylene glycol, hexymethyl diocyanate, isofol, acetone diamines as raw materials, and the water resistance and water resistance of the emulsion were significantly improved compared with the unaltered emulsion.
To effectively improve the performance of water-based polyurethanes, the researchers combined the excellent properties of inormeric nanoparticles and water-based polyurethane-based pumping to polyurethane substrates by mixing or chemical bonding to improve the thermal stability and mechanical properties of water-based polyurethanes. Zhang Yu of Anhui University and others used the improved Hummers method to shoot graphene oxide, and then used ethyl amine chemical reduction modified, to obtain amino modified reduced graphene oxide (ARGO), and finally, the use of in-place emulsification ARGO / water-based polyurethane complex, experiments show that ARGO's addition of the composite material thermal stability, stretch strength and conductivity has been significantly improved.
the study of water-based dispersed isocyanate curing agent has been the focus of researchers, most of the domestic research focused on the use of non-ion correction, but because polyethyl glycol monomethyl ether modified isocyanate easy to cause system crystallization. To this end, Wang Lei of South China University of Technology and others used polyaldehyde resin /polyglycol monoether hybrid modified HDI tration system to prepare water-dispersed polycyanate curing agent. The effects of hydroxyl value and addition of polyaldehyde resin, NCO content, viscosity, water dispersion and coating properties after painting with hydroxyl resin were studied, and the results showed that polyaldehyde resin was successfully introduced into the curing agent molecule, which significantly improved the thermal stability of two-part water-based polyurethane.
the combination of water-based polyurethane and UV technology of water-based UV polyurethane has both advantages, conventional UV-cured water-based polyurethane through monohydroxypropylate to its end, this method can not take into account the high relative molecular quality and high double-bond content. To this end, China University of Science and Technology Sun Wei and so on to a home-made long measuring chain containing double-bond binary alcohol as a chain expansion agent, prepared a hydro-hydroploric polyurethane pre-polymer, and then added a double-bonded multi-function acrylic monomer, The nuclear shell polyurethane/acrylic emulsion, which is made of water-based UV varnish with high gloss, and has excellent mechanical properties and chemical resistance, has broad application prospects in water-based wood coating, automotive cover varnish and other fields.
-based coatings
water-based epoxy coatings have excellent properties of both epoxy systems and dry oils, especially for water-based coatings for automotive components. However, in the application, such as paint film drying speed is slow, poor weather resistance, alkaline resistance and other problems. To this end, Changzhou Coatings Institute Xu Fei and so on first developed a vinyl modified water-based epoxy ester emulsion, which with a specific acrylic emulsion as a film-forming substance, add pigment slurry and additives, preparation to obtain water-based industrial coatings. The combination of water-based epoxy resin is indicated, the curing process is analyzed, the coating formulation is optimized, and the process parameters of the prepared water-based coating products are discussed. The prepared water-based coatings have a good appearance, good adhesion to the substrate, high hardness, and good water and salt spray resistance, and have been successfully used in the automotive parts department, motor housing and other industrial coating fields instead of traditional solvent-based coatings.
Nanjing Forestry University Yang Yaping and other epoxy resin and acrylic as the basic copolymer monomer, prepared a non-alkyl phenol polyoxyethylene ether (APEO) phosphorus epoxy acrylates poor compatible, difficult to branch the problem, first of all, methyl acrylic and epoxy resin open epoxy reaction synthesis polymerized methyl propylene epoxy monoester. In order to make water-based coatings have excellent anti-rust function, the water-based emulsification system without APEO is studied, and phosphate emulsizers and monosomes are introduced. The resulting emulsion is delicate and uniform, and the coating film is complete.
Jiangnan University Zhang Guo standard and other methyl acrylic shrinking glycerides sodium sulfonate and acrylic copolymer synthesis preparation photosensitivity doping agent G-PSA, and G-PSA for water-based dispersants and charge balance doping agent preparation PEDOT/G-PSA, the use of polyserotonol secondary doping to enhance its conductivity. After the film UV curing forms a cross-network structure, its water resistance and environmental stability have been greatly improved, but also has a high conductivity, by its preparation of anti-static coatings have good transparency, adhesion and conductivity.
"environmental protection" has become one of the important key words in the development of the paint industry, if enterprises want to make a breakthrough in the field of industry, we must combine the current policy to accelerate the development of environmentally friendly high-tech coating products.