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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: research and application of art coating in construction machinery industry

    Coating knowledge: research and application of art coating in construction machinery industry

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    In addition to the protective function of general coatings, art coatings also have a strong decorative effect, full of three-dimensional and flickering sense, which are widely used in interior decoration, crafts and other surface coating Art coating not only plays a protective and decorative role on the surface of objects, but also improves the added value of products It is favored by the majority of users and gradually becomes a high-grade decoration material in the decoration industry With the rapid development of science and technology and the intensification of market competition, the decorative requirements for the appearance of construction machinery are increasing day by day In order to meet the personalized needs of users, high decoration, high environmental protection and low consumption have become the art painting technology of large construction machinery industry Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Paint Home News: 0 Introduction in addition to the protective function of general paint, art paint also has a strong decorative role, full of three-dimensional and flickering sense, widely used in interior decoration, crafts and other surface coating Art coating not only plays a protective and decorative role on the surface of objects, but also improves the added value of products It is favored by the majority of users and gradually becomes a high-grade decoration material in the decoration industry With the rapid development of science and technology, the fierce market competition, the decorative requirements for the appearance of construction machinery are increasing day by day In order to meet the personalized needs of users, high decoration, high environmental protection and low consumption have become the development trend of art painting technology in large construction machinery industry The variety and scope of art paint are constantly developing and changing New art paint and painting technology are emerging The appearance and application of hammer paint, orange paint, spray paint and other ugly paint, crack paint, pearlescent paint, chameleon paint and other high decorative paint not only make the product appearance more colorful, but also bring people strong spiritual infection and visual enjoyment In this paper, the characteristics, principles and field construction performance of several kinds of art coatings which are widely used in the construction machinery industry are summarized Research and application of fine art paint in construction machinery industry 1.2 formation principle of crack paint in the process of film formation of crack top coat, due to the rapid volatilization of solvent, cracks are generated in the interior of top coat film due to uneven stress, showing irregular crack gap, so that the base color paint with different color from crack top coat is exposed in the crack gap, forming a good and uniform crack pattern Generally, the greater the color contrast between crack primer and finish, the stronger the stereoscopic feeling and the better the effect The results show that the crack formation depends on the interaction between coating and coating When the paint is in an isolated state, it shrinks uniformly in all directions; when the paint is on the substrate, the paint film is not only affected by its own shrinkage and tensile force, but also by the influence of the fluidity of the primer, resulting in uneven shrinkage of the topcoat and stress concentration When the stress is greater than the tensile strength of the film, it will crack and form cracks On the contrary, when the primer has no flexibility, the top coat will not produce stress concentration and crack, and when the top coat stress is less than the large tensile strength of the paint film, it will not crack The formation of the crack effect is largely related to the composition of the coating When the weak link of the coating molecular chain is less and the bonding strength is small, the crack will be relatively straight when cracking (as shown in Fig 1a-1c); otherwise, when the bonding strength of the molecular chain is large, the crack points will be more, forming a curved and uneven skin texture effect (as shown in Fig 1D) For example, to ensure the size and uniformity of crack spraying, crack paint is generally used in the production of small workpiece spraying, such as the decorative plane of coaming, box cover, etc 1.3 construction performance of crack paint 1 Base material selection: the base material for spraying crack paint is widely selected, including steel plate, wood, fiberglass and plastic products 2 Coating selection: in order to ensure the better corrosion resistance, appearance decoration and environmental protection of construction machinery products, two-component epoxy type dermatoglyphic primer, water-based resin topcoat and flexible curing agent with a longer curing time are generally selected as the coating supporting system Because if the curing time is too short, it will be difficult to control the coating process of the top coat, the film cracking is difficult and the effect is poor Considering the environmental protection and safety, the water-based top coat has become more and more choice 3 Coating process: the coating process of the crack paint is the same as that of the common paint Generally, it is: pretreatment of the substrate - spraying crack primer - drying - spraying crack finish - drying - spraying varnish - drying Because the crack paint is loose and lacks the proper adhesion to the primer, it is necessary to spray varnish on the surface of the crack paint to increase the bonding strength of the crack paint and the adhesion to the primer 4 Spraying process requirements and precautions of each process: whether the crack paint can present a uniform and beautiful pattern on the workpiece surface is closely related to the corresponding coating process technology and environment besides the performance of the crack paint itself In the production process, the following factors must be paid attention to to to ensure the normal and efficient implementation of the crack paint process (1) Before construction, the spray pattern must be on the small sample plate which has been sprayed with primer According to the effect of crack size, the construction viscosity of crack top coat, the thickness of paint film, the shape of spray gun, air pressure, paint output (setting), and the speed, distance, spray technique, atomization status of spray gun and the color proportion of paint deployment must be well selected (2) The primer shall be leveled and self dried after spraying, and the paint film can be wet and wet to spray the crack finish after it reaches the surface dry state The difference between the crack primer and the conventional product is that the crack primer cannot be dried to the dry state, otherwise the adhesion between the primer and the top coat will be affected, and the crack effect will not be obtained (3) The thickness of the top coat shall be subject to the color of the primer completely covered The thickness of the paint film can be controlled according to the crack size to be obtained In the early stage of the crack, the striation is shallow and fine With the extension of time, the crack gradually grows and thickens Generally, the thickness crack of the paint film is large, the thin crack of the paint film is small, the crack speed is fast, the film thickness is uniform, the crack size is uniform, uniform and beautiful If large crack effect is needed, the primer film thickness should be thicker, and the crack paint should also be sprayed 2-3 times more, and the air volume should not be too large; if small crack effect is needed, the opposite is true (4) After spraying varnish, in order to make the film obtain better hardness, it is generally dried The hardness of paint film dried at 150 ℃ is the highest, followed by that dried at 80 ℃, and that dried at room temperature is the worst (5) Selection of temperature and humidity: as the crack paint is sensitive to temperature and humidity, it is not suitable to construct if the ambient humidity is too high, too high or too low In order to avoid adverse effects, the temperature of 25 ℃ and relative humidity of 75% are generally preferred When the site temperature is high, the solvent volatilizes quickly, and the top coat needs to be sprayed as soon as possible, otherwise the primer is too dry and cracks are not easy to appear The cracking of water-borne crack paint usually starts within 20min-40min after spraying the top coat, and there will be some differences according to the ambient temperature, humidity and coating thickness Generally, the spray environment temperature is high, and the cracking is faster Even in an airtight environment, cracks can form (6) In addition, the spray guns for spraying oil-based paint and water-based paint should also be used separately, otherwise it is easy to cause secondary pollution to the paint film With the increasing demand of high decoration (high freshness, high brightness, high flash color) in the finishing coat of mechanical products, the applications of metallic flash paint and pearlescent finishing coat with pearlescent effect, flash effect and angular heterochromatic effect are increasing gradually 2.1 with the effect of angle heterochromism the arrangement of metallic pigments and pearlescent pigments in the film has a great influence on the effect of angle heterochromism That is, at the same incident angle, with the change of the observer's angle of view, the brightness of the film changes strongly If the flake pigments are arranged irregularly in the film, the light will diffuse on these pigments, and the effect of angular heterochromism is very small; If the arrangement of flake pigments in the film presents a regular orientation, the incident light on its surface presents a directional reflection As a result, when viewed from one angle, the reflected light intensity is very strong, while when viewed from other angles, the light intensity is very weak, resulting in a strong color effect with the angle [1] 2.2 formation principle of pearlescent paint metallic paint is also called metallic flash paint It is named after the fine metallic pigments (such as aluminum particles, copper powder, etc.) are mixed in the paint A layer of varnish is added outside the metallic paint for protection After the film is formed, the metal pigments are arranged in different layers in a directional way After the light hits the metal particles, it is reflected by the particles through the paint film, so it looks like the metal is shining Changing the shape and size of metal powder particles can control the flash of metal flash paint film Pearlescent paint, also known as mica paint, is a kind of metallic flash paint, named after the pearlescent pigment added to the paint The pearlescent effect is due to the addition of mica pigments coated with titanium dioxide and iron oxide [2] (1) When the light hits the mica particles, it first takes on the color of titanium dioxide and iron oxide (2) The incident light passes through the pigment flakes with uniform particles and small particle size, and then complex refraction and interference occur (3) The combination of mica itself has a special, transparent color The visible light is reflected twice on the surface of titanium dioxide film and mica, and the two reflected light produces light interference effect under certain conditions In this way, after multiple reflections and refractions of visible light, it is put into people's eyes again Therefore, pearlescent paint gives people a colorful, dazzling, like the depth and level sense of Pearl flakes in sparkling 2.3 precautions for the coating process of pearlescent paint construction performance: the luster of pearlescent paint comes from the deep layer of the paint film, the pearlescent powder is a small transparent thin film, and the more transparent the medium, the less light loss Therefore, in the process of paint making, we should try to avoid the use of masking pigments and additives that are easy to cause turbidity In the paint film, the arrangement of pearlescent pigment film coating shall be parallel to the surface of the paint film as much as possible to present a more brilliant pearlescent effect (as shown in Fig 2a-2f) Therefore, in the coating process, try to make the wet film produce enough fluidity to ensure that the pigment particles can automatically achieve parallel orientation For example, Sany Heavy Industry's pump truck, crane metal pearlescent paint, Terex crane cab pearlescent paint, XCMG crane, water drill paint used on fire trucks, etc have become the focus of the exhibition due to their flashing metal pearlescent effect Brief introduction of chameleon paint
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