Common knowledge of coating: light curing automobile coating

Core tip: plastic parts coating Engineering plastics or polymer based composite materials have been used in many parts of automobiles They not only need coating to improve their surface properties, but also have a very outstanding advantage in this regard UV curing has been used in this field for more than ten years 1 Lamp lampshade: polycarbonate lampshade has already replaced glass lampshade Polycarbonate has the advantages of easy processing and molding, light weight, strong flexibility and not easy to break, etc., but its surface strength is not enough, it is not resistant to scratch and scratch, and it has poor weather resistance and is easy to turn yellow The use of light curing coating can improve the surface properties Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: many parts of plastic parts paint automobile have used engineering plastics or polymer based composite materials They not only need coatings to improve their surface properties, but also UV curing coatings have a very prominent advantage in this respect UV curing has been used in this field for more than ten years 1 Lamp shade: polycarbonate lamp shade has already replaced glass The lampshade and polycarbonate have the advantages of easy processing and molding, light weight, strong flexibility and not easy to break, but their surface strength is not enough, they are not resistant to scratch and scratch, and they have poor weather resistance, and they are easy to turn yellow The use of light curing coating can improve the surface properties, so it has been applied, which not only greatly saves the coating time, but also has good optical friction resistance, and can meet the long-term weather resistance Sexual requirements 2 Reflector: the automobile reflector is also made of plastic, but its surface must have high reflective performance In order to achieve this goal, the plastic surface must be treated by three times of ultraviolet irradiation First of all, the surface of the plastic should be exposed to UV light to produce photochemical reaction and increase the surface tension, so as to facilitate the leveling and adhesion of the UV curing coating After coating the UV curing varnish, the plastic surface becomes flat and easy to metallization, and then the metal deposition is completed in the ground vacuum deposition box After the metallization of the plastic surface, another layer of light curing coating is needed Its function is to maintain and expand the metal reflective layer 3 Glass fiber reinforced composite parts: composite materials have been widely used in various parts of automobile In order to protect the surface and beauty, coating is required For example, the car body part of the model racing car is made of composite materials cured by electron beam and decorated with light curing paint One of the key problems of using UV curing coating on large parts is to design a coating curing chamber which is convenient for the whole body coating Light cured powder coating light cured powder coating combines the advantages of powder coating and light cured coating It can not only be used in metal, but also in plastics, wood products and other heat sensitive components, greatly expanding the scope of use of powder coating Therefore, it has great potential in the use of automobile, and is valued The frame and rim of automobile can be replaced by powder coating The metal frame of the car needs to bear the damage of stone strike, contamination, blister, etc generally, it needs to be treated with electrophoretic paint first, but the color selection of electrophoretic paint is limited and there are usually paint defects such as stripe, etc in order to improve its decoration, it can be made up by color light curing powder paint The combination of the two can achieve satisfactory results, and the powder coating can give excellent decoration The wheel rim coating made of aluminum alloy has very high requirements for the coating The traditional wheel rim coating generally uses thermosetting powder coating as the primer, then the middle layer with flash effect, and finally the transparent finish Now these three coatings can be replaced by light curing coatings When three-dimensional (3D) parts with different shapes, sizes, angles, bends, edges and bumps of 3D curing equipment and technology are cured, light shall be projected on all surfaces, and reliable and sufficient energy shall be available Generally, lamps and lanterns are composed of tube lamps and reflectors Reflectors are used to gather light beams and project them to objects Reflectors are generally oval or parabolic Elliptical lampshades are used The tubes are placed in the first focus of the ellipse, and the light is focused on the second focus to form a narrow high irradiance beam However, due to the divergence of the light, the irradiance decreases rapidly when it deviates from this point Using parabolic lampshade, the same UV beam can be obtained in a wide range, but the irradiance is low and the shadow can be increased on three-dimensional objects In order to obtain the full solidification of the whole surface, some measures need to be taken: first, improve the ellipse to form the shape of the lampshade, change the focus of the light, make it farther away from the lamp surface, and make the focus wider Although this will reduce the peak value of high radiation, it can make the light intensity more uniform, and get enough radiation at a distance from the lamp, while maintaining the aggregation and divergence The advantages of light are to reduce the occurrence of shadows; the second is to optimize the formula, the spectral absorption of the coating should match the emission spectrum of the lamp; the third is to optimize the process conditions, the energy of UV light projected on the object should match the processing speed; the photosensitivity of the coating and the thickness of the coating should be optimized, so that the surface coating can be completely cured within a larger range of light intensity Of course, there are also special requirements for 3D curing device The production line should be designed according to the actual situation, such as the size and shape of the object, whether the object is vertical or horizontal, and whether the latent shadow can be illuminated by rotation In order to meet the requirements of light curing energy and the regulation of curing speed, it is an important method to install the lamp on the robot There are many advantages of using robot, many parts which can not be illuminated by fixed light source can be effectively illuminated As mentioned before, the coating and curing of FRP body requires a large space of three-dimensional coating and curing device, which is also a challenge The application of dual hybrid curing for some parts, regardless of the design of curing device and light source, there are always some parts of the light can not meet or the light intensity can not meet the coating requirements, so pure UV curing coating can not meet the coating requirements In order to solve this problem, the development of UV curing and thermal curing methods seems to offset the advantages of UV curing, but this is an insurmountable problem However, hybrid curing system has some advantages over pure thermal curing system, such as low curing temperature and short curing time Since most of the objects are dry in the light, only a few parts are not dry, so the possibility of contamination can be reduced Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,