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    Home > Coatings News > Paints and Coatings Market > The development of electrostatic powder spraying technology

    The development of electrostatic powder spraying technology

    • Last Update: 2020-02-13
    • Source: Internet
    • Author: User
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    As we all know, electrostatic powder spraying technology is almost 100% applied to metal surface coating since it was born in 1960s Although many powder manufacturers and equipment suppliers have claimed for a long time that "electrostatic powder spraying can be applied to non-metallic surfaces", the products that can form industrial production have not appeared In the late 1990s, with the development of powder coating and spraying equipment, it is possible to apply electrostatic powder spraying technology to non-metallic surfaces For the coating of non-metallic materials, Yudong gottingshi and iruda have been committed to the electrostatic powder spraying of MDF in the past two years, and it has become a reality in industrial production This paper mainly introduces the latest situation of spraying MDF in order to promote the development of electrostatic powder spraying technology in China 1 Related factors of electrostatic powder spraying electrostatic powder spraying is the process of coating powder coating on the coated object through electrostatic action and baking at a certain time and temperature The factors involved in this process include the coating object, powder coating, spray gun, baking equipment, etc The analysis of these factors is helpful to understand the whole process 2 Confirmation of coated objects: economically speaking, the coated objects are identified as bulk commodities Besides metal, wood and plastic shall be selected Among them, due to the problem of temperature resistance at present, plastics cannot be considered temporarily For wood, MDF (medium density fiberboard) has become the first choice The reasons are as follows: electrostatic powder spraying requires the material to have conductivity, while wood is a kind of hygroscopic material, that is, it will exchange water with the surrounding environment After a certain period of time, it will absorb the water in a specific environment at a certain temperature, so as to achieve balance Therefore, in general, the moisture content of the finished products in Mucun will keep a proper balance with the local climate It can be considered that by adjusting the moisture content of wood base material, wood can be made to be close to or equivalent to the state of conductor MDF is a wood product, which also has the above characteristics In addition, MDF, as a green building material in line with environmental protection, has a huge amount of application, and its growth in wood-based panels is also very fast Moreover, MDF is a large-scale industrial production product, whose product has stable quality and adjustable product technology is also an important factor It is these factors that make MDF the first choice of powder spraying 3 Technological progress of powder coating thermosetting powder coating has been affected by curing temperature (conventional curing temperature is 180 ℃, 20min) for a long time, which limits the application range of the process In recent years, more and more low temperature curing powder coatings have appeared It has been reported that the powder cured at 120 ℃ for 20 minutes can be prepared Of course, there are still some problems such as poor storage stability in the low-temperature solidified powder, which limits the application scope to a certain extent It is believed that there will be improvement in the near future The powder used in MDF spraying includes UV curing powder and ultra-low temperature curing powder It is reported that DSM company has published the materials of maleic acid / vinyl ether UV curable powder coating, whose coating object is MDF At present, the epoxy / polyester powder is used in MDF (MDF) by iruda company, and its curing temperature is controlled within the maximum curing temperature range (150 ℃) of general paint 4 The new breakthrough of electrostatic powder spraying equipment corona charging gun has experienced several stages, such as voltage charging, current charging, total energy control charging (t.e.c) The first two charging methods limit the sprayed workpieces to metal parts, while the adoption of "Tec total energy control" technology breaks through the above limitations When the distance between the spray gun and the workpiece (power connection point) changes, the current and voltage can be adjusted automatically to maintain the total charge energy, effectively control the charge amount of powder and ensure the powder loading efficiency The specific spraying distance, current and voltage changes are shown in Figure 1 5 Baking equipment: for ultra-low temperature solidified powder, use special baking channel (IR curing baking channel mentioned in gaotingshi report) to cure and eliminate the volatile components produced by MDF in continuous high temperature state That is to say, the volatiles are consumed in the drying channel and the curing temperature is stable at the process temperature This is different from ultraviolet (UV) curing, which uses infrared lamp to melt and level the powder (below 100 ℃), and then uses ultraviolet lamp to cure the film for several seconds Based on the above points, the industrial production of electrostatic powder spraying (ultra-low temperature curing) of MDF began in the late 1990s In August 1999, the first fully automatic MDF special production line in the UK was put into production successfully It can be predicted that in the next two or three years, MDF powder spraying process will have a rapid development Of course, there are some aspects that need to be improved for MDF powder spraying process in the future: low curing temperature of coating (including further development and utilization of UV curing powder); diversification of coating varieties; by selecting spray gun with TEC charging technology and reforming existing curing equipment, the production line can spray metal products and MDF, etc At the same time, we can also foresee that other non-metallic products will enter the field of electrostatic powder spraying.
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