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Conventional powder coatings need to be cured at a temperature of 180°C-200°C in 10-20 minutes
.
Especially thick workpieces have slow heat transfer and may require higher temperature or longer time
.
Inefficient baking paint online coatingol.
com
.
Higher energy consumption, coupled with the need to invest a lot of money in baking equipment, increase the overall overall cost
.
The curing temperature of low-temperature curing powder coatings is 160° and below, which shortens the heating time, reduces the energy consumption, and at the same time shortens the production cycle.
The huge economic benefits and environmental protection advantages mark the broad development space in the future
New product formula
Resin: The key to determining the performance of powder coatings is resin.
Resin suppliers at home and abroad have developed new resins such as unsaturated polyester, unsaturated acrylate resin, urethane acrylate resin, and vinyl ether resin
.
Latent curing agent for new powder coatings: Latent curing agents generally use physical and chemical means to improve the curing activity of commonly used low-temperature and high-temperature curing agents, so that the curing agent does not react when mixed with the resin at a certain temperature.
When in use, the reactivity of the curing agent is released through external conditions such as light and heat, so as to achieve the purpose of rapid curing of the resin
Figure-1 Typical curing mechanism of latent curing agent
Combination boxing with new curing technology
Infrared heating curing technology: Infrared curing is a new type of thermal curing method.
Near-infrared and mid-infrared can heat both the coating film and the object to be coated at the same time
Figure-2 Infrared curing drying tunnel
Ultraviolet (UV) curing technology assistance: Unlike traditional thermal curing powder coatings, the melting, leveling and curing of UV curing powder coatings are two independent processes.
First, the powder particles are heated by infrared radiation to melt and level, and then Then UV radiation curing is carried out, so that a smooth and smooth coating film can be obtained
Figure-3 Typical UV curing mechanism
Electron beam curing technology (Electron Beam Curing): Electron beam curing refers to the use of electron beams emitted by a low-energy electron accelerator to directly act on the polymer liquid coating painted/printed on the surface of the substrate, and make the liquid through the chemical reaction of radiation.
The surface hardening process where the coating quickly transforms into a solid
Figure-4 Principle of electron beam curing
New powder manufacturing technology
The supercritical fluid method (VAMP) powder coating manufacturing technology developed by Ferro in the United States is to add various components of the powder coating into a high-pressure reactor, and fill the reactor with carbon dioxide to a critical state, so as to achieve the low temperature of each component of the coating.
It is fluidized and achieves the effect of melt extrusion, and sprayed into the product with the required particle size through the nozzle
.
However, due to the special equipment and technology, the investment is relatively large, and the temporary application is relatively small
.
Figure-5 Supercritical fluid method flow
Although there is a great demand for low-temperature curing powder coatings, two problems in low-temperature curing powder coatings hinder its production and application: physical and mechanical stability and chemical stability
.
In response to the growing demand for low-temperature solutions from construction machinery customers, the Nippon Powder Innovation Team has successfully developed a 160°C low-temperature curing (NPD-ACE-LT) system and 140°C ultra-low temperature curing (NPD-ACE-ULT) after continuous attempts.
