Paint water-based attack, how to prepare the technology?

China Coatings Network
: "
water-based
production enterprises ten years grinding a sword, now it should come out." Zhu Yan'
secretary-general of china's
Technology Alliance, said in a recent interview with the China National Chemical News. Environmental new policies are becoming more stringent, consumer health awareness is growing, high VOCs
coatings
seems to have been exhausted. However, according to the China Chemical News reporters understand that
wood coatings in
, the proportion of water-based well below 10%. In addition to the low acceptance of downstream enterprises, water-based coating application costs and product performance is still not satisfactory is also the main reason. Facing the water-based era of comprehensive attack, what new requirements are put forward for supporting resins, coloring systems, additives, etc.? How should raw material manufacturers deal with it? A reporter from China Chemical News conducted a wide range of interviews.
Yang Huan, marketing service manager of wanhua Chemical Group Co., Ltd., believes that
wood paint
further oil-to-water, technology mainly faces the following challenges: First, the hardness of the paint film is insufficient, second, it is difficult to achieve a full closure effect, third, wood swelling problem, fourth, the drying process is greatly affected by the environment. China Chemical News reporter learned that the performance of paint is mostly achieved by resin. The hydration of wood coatings depends critically on the performance and cost of water-based resins.
Yang Huan pointed out that the use of furniture in different fields, the performance requirements of different coatings. For example, outdoor furniture requires paint water and white, weather resistance, flexibility requirements are high; Interior furniture has high hardness, appearance, chemical resistance and mechanical properties. This requires targeted selection of different resin systems into the formulation design. From the resin point of view, oily paint resin also has many categories, such as nitro paint, PU paint,
UV
and so on. Before the wood coating used resin is mostly acrylic emulsion, although the cost is low, dry fast, good polishing, but the performance is single, it is difficult to match the above oily coatings, so more water-based resin system is needed to form an overall effect to replace oily resin. How to improve performance, how to reduce the sensitivity of paint film to the environment during drying, how to solve the problem of swelling, how to improve the wetting properties of water-based resin to wood, are to be solved by resin suppliers. At present, puD, PUA, water-based UV, water-based dual-part system has been successfully developed, so that downstream users have more choices.
, deputy general manager of Hebei Chenyang Industry and Trade Group Co., Ltd., said in an interview that the rapid development of new chemical materials, water-based paint performance optimization provides a strong guarantee. At present, the domestic use of more or Opeldi, DSM and other multinational companies water-based resin. Domestic enterprises produce water-based resin products in terms of performance index stability there is room for improvement. "For example, temperature control in emulsion production is critical, and if the temperature control equipment is not sensitive, there will be a large range of temperature fluctuations, resulting in differences in batch-to-batch performance beyond the allowable errors. Domestic enterprises in the finished product testing means, production control means compared with international producers there is still a large gap. At present, some enterprises in the introduction of foreign production equipment, the implementation of fully automated control. Only the high degree of automation of equipment, precision control, product performance indicators can be stable, downstream enterprises can also produce stable products. Hua Dong-thon said.
the different solvents, the demand for water-based coatings in coloring systems is very different from that of oily coatings, which has given birth to the development heat of water-based coloring systems.
According to Dongguan Color Hong Chemical Co. , Ltd. technical engineer Shu Wei introduced, color essence is the paint industry transparent color coloring scheme, in the application of water-based paint plays an increasingly important role. Good water-based coloring not only needs to have good compatibility with water-based coatings, but also the powder used should have better refractability, temperature resistance, color migration and sufficient brightness, in performance with all the characteristics of solvent-based products, in order to better be accepted by users.
the current market for water-based system transparent coloring system, mainly acidic dyes and metallic group coloring two systems. Acidic dyes react easily with weak alkaline water-based coatings and fade easily. Previous metallic enseging requires the dissolution of organic solvents at a higher cost. In order to adapt to the application of water-based coatings, color Hong company developed CH-W121 water-based yellow essence, CH-W721 water-based brown essence, CH-W823 water-based black essence, CH-223 water-based orange essence and other series of coloring products. The metallic enses pigment pigments in these water-like colors are not completely soluble in the water-like system, but are a stable dispersion state.
industry experts pointed out that color paste is also a large category of water-based paint coloring system products. With the hydration of the coating, there is a lot of room for the future development of the slurry that can be used with the water-based coating. Water-transparent slurry is mainly used for wood coloring and higher-grade car paint. After using transparent color paste, the wood grain can be displayed well and the wood grade can be raised. In
automotive
, transparent slurry with aluminum silver slurry and pearlescent pigment use can improve the effectiveness of automotive coatings. Water-based solid color paste is the most widely used in water-based
-industrial coatings
coloring systems, and its performance has a lot to do with the light resistance, weather resistance and chemical resistance of the pigment itself.
with the increasing use of water-based coatings in the future, water-based coloring systems will become more and more mature, providing downstream users with more personalized solutions.
it is understood that water-based coatings and oil-based coatings are mainly different in solvents. Coating film- and flow-leveling, paint film properties and solvents are closely related. Oily
coating solvents
kinds, depending on the need to adjust solvents, and water-based coatings only water and a small amount of co-existence solvents, it is difficult to achieve oily coating film-forming, flow and leveling, need to add additive regulation.
reporters learned that, in theory, water-based emulsions can achieve better materialization than oily systems because of their higher relative molecular mass. However, since the raw materials of the oily system have been well developed, technical researchers can obtain ultra-high performance coatings through special raw material selection or additives. In contrast, aquatic products are not very rich, there is no superior performance of the emulsion to choose from, the correct use of film-forming additives, with the right system of additives to improve the performance of the paint film is very critical.
predictably, with the acceleration of the process of oil-to-water, a number of new film-forming additives, fluidizers, leveling agents, crosslinkers and functional fillers suitable for water-based coatings will emerge.
In addition, because the water-based wood coating formula contains a large number of organic substances, very suitable for the growth of microorganisms, microbial mucus will break down the composition of wood coatings, affecting the flow of products and other properties, resulting in product quality, affecting the use. Therefore, it is necessary to control the growth of microorganisms, preservatives in the tank need to have the following characteristics: broad-spectrum antibacterial, pH application range, to meet the protection requirements under process conditions, safe operation, good compatible, low amount of addition, in line with the relevant regulatory requirements.