Color Art of Pearl Pigments and Coatings

1since 1978, when Sol Danush, a German paint scientist, first applied the mica titanium beads to metallic flash car finishes, it has greatly contributed to the advancement and development of automotive coatings and coating technologies around the worldIn recent years, the application of high-decorative magic-color pearl coatings made from magic-color pearlescent pigments has been paid more and more attention by the coating and automotive industryEspecially for cars with high decorative color paint, can create a new color art effectAt present, with a variety of magic pearl coating coating of various brands of new brands of cars, and constantly appear in the international automotive and paint exhibition booth, to the vast number of automotive enthusiasts and consumers with a refreshing feelingFrom an aesthetic point of view, it is no exaggeration to call the mica titanium pearl coating "a fine chemical work of modern paint" and "a revolution in car coating"this paper intends to summarize the previous people and their own previous practice work on the basis of how to use the magic pearl paint to create a new color art effect of paint to make a shallow discussion2The construction and type of the phantom pearl pigmentthe magic color pearl pigment is a series of mica titanium pearly pigments, also known as "rainbow pearl pigment"This pigment itself does not have color, it shows the same color as the natural rainbow produced, is a typical pseudo-color, is the pigment sheet of the incident light multiple reflections and refraction of the results of the addition of each othermagic-color pearlescent pigment is obtained by re-coating and regulating and controlling the level and thickness of titanium dioxide polycrystalline film on mica sheets on the basis of the manufacture of silver-white pearly pigmentsAt present, domestic and imported magic color pearlescent pigments according to its display of pseudo-color phase can be divided into gold, gold, purple, eggplant purple, gem blue and olive green fiveat the same time, in the production process of magic color pearleid pigment, with the increase of the geometric thickness of titanium dioxide polycrystalline membrane on the mica sheet, a series of magic color pearlescent pigments may be produced between these major pseudo-color phasesHowever, because of this transition altogether of the magic color pearlpolish pigment in the manufacture, reaction parameters are extremely difficult to control, it is difficult to ensure the geometric thickness of titanium dioxide polycrystalline film, so the reproduction is poor, coupled with the poor visual perception, so manufacturers rarely as a product market circulationThere is a relationship between the optical thickness and geometric thickness of titanium dioxide encased in the mica sheet:a, geometric thickness, optical thickness/refractive index b, titanium dioxide refractive index: 2.52 in sharp titanium type, 2.71
3Magic color pearl pigment Optical propertiesthe optical properties of the magic-color pearly pigment are concentrated in the following five main aspects:3.1 pearl effect
pearleffectn effect refers to its pearl-like soft color, pearl color is by the titanium dioxide polycrystalline film encased in the mica substrate to produce multiple reflections and transmission resultsFor pearly pigments with small particle size, because the titanium dioxide polymorphic film encased in the surface of the mica sheet is divided into many tiny layers like the internal structure of a natural pearl, so that when the natural light hits its surface, it will appear a silk-like soft color, called "pearl light"This optical feature is called the pearl effectThe pearl effect is the basis of the art color on which we create the color of the applied pearl3.2 Metallic flash effect
a decorative metallic pigment appeared in industry in the 1920s and 1930sIt is used by the metal pigment sheet with the characteristics of the mirror reflection to light to achieve the purpose of decorationMetal aluminum shines cyan in natural light, copper (brass) flashes yellow light, stainless steel flashes white light, and zinc-copper alloy flashes strong golden glow, etcThis metallic surface's mirror reflection on light produces a flickering vision of the human eye known as the "metal flash effect", and the mica titanium pearlpigment has this characteristicPure quality of natural spline through titanium dioxide and other metal oxide coating, or with colorants, can obtain a series of metallic color, for example: the simple use of titanium dioxide coating mica titanium beads can show a strong silver-white metallic gloss; Carbon black coloring or calcined in a reduced atmosphere to form a denatured oxide of titanium, can show a deep color of lead metal gloss, with chromium oxide coloring silver-white pearl pigment flashing bronze gloss, with iron oxide coloring magic yellow pearl pigment to show strong and realistic gold gloss3.3 angle flash effect
because the mica titanium beads are made up of metal oxides that are covered with a transparent layer of transparent surface of the female mica sheet and whose refractive index is much higher than the substrate mica When light in the refractive and reflective light in the different transparent interface of the refractive index, and partial absorption, penetration of the various reflective light between the interference phenomenon of light must occur and create a magic color For the observer, the sharpest interferometry can be seen when the line of sight is at the reflective angle of light and deviates from the reflection angle, only bead white or other colors This phenomenon of seeing different interferometry with the observer's observation angle is called the "view-flash effect" 3.4 Color Transfer Effect
continuous coating made of interferometry magic-color pearlescent pigment sits can simultaneously display two different colors called "color transfer effects" For example, the color of a car coated with a pearl coating made of magic-colored pearlescent pigment will change color transfer effect from blue to orange with the curvature of the car body; That is, from the reflective color of the magic-color pearl pigment to its complementary color It is precisely because of the unique color transfer effect of the mica titanium pearlescent pigment that people can design and create a variety of wonderful and fantastic decorative effects according to different needs 3.5 Additional color effect
mica titanium pearlescent pigments can be used with transparent organic and inorganic pigments or directly with these pigments to color the pearlescent pigments produce more attractive colors Such as copper eilan, green, transparent iron oxide red and the same color of the magic pearl yading pigment mixing its color will not weaken but will also enhance This is the pearly pigment unique "additional color effect" also known as "color-adding effect." We know that one of the biggest disadvantages of conventional metal pigments such as aluminum is that the saturation of its color when it is mixed with the resin is attenuated significantly, causing the color to become deep and dim However, the color of the pearly pigment after color or after the construction of the film color will become more bright, bright 4 Standard primer paint - pearlvarl, color paint system 4.1 pearl varnish
the pearlvar leaching referred to here refers to the use of a variety of transparent resin sin does not add any body pigments or coloring pigments only mixed with the magic pearl paint and made similar to the shield paint a class of paint The pearly pigments contained in the varnish are relatively small and usually only 05% to 1% or less of the quality of the resin substrate The formulation of this low-key ratio is designed to minimize its masking force so that the color of the base coating is revealed through a thin surface coating or interferes with the color light of the bottom coating in order to produce a new color effect The formulation used in the primer paint should be used in addition to considering the solid attachment of the substrate, but also with the varnish to avoid the production of the paint disease such as biting the primer The varnish should be used with low solid fractions and a leveling agent to ensure the directional arrangement of the flaky pearlescent pigments in the varnish Due to the low viscosity of varnish in the construction may produce "flow hanging" construction can be added a small amount of thickener such as polyethylene wax paste for example: for room temperature curing, to -OH and -NCO cross-linked film of the two-component polyurethane of the pearly varnishe formula
varnish can also be made into a baking type of heat-cured cross-linked film single-component paint The color of the primer can be freely selected according to the need but requires a high coverage force, good rheumatity performance during construction, good interlayer adhesion with pearlvar and not dissolved by strong solvents in the varnish during "wet and wet" construction It is worth pointing out that the use of magic-color pearlescent pigment and conventional primer matching the production of pearl coating film its color is extremely bright The saturation of both hues, brightness, and color is unmatched and unmatched with conventional pigment color Pearl varnish is commonly used in primer-face paint dual coating systems, which can act as both decorative and glossy 4.2 color paint
pearly finish paint refers to a type of finish that is colored by transparent organic or inorganic pigments and then mixed with the magic-color pearlele pigment Coloring pigments can be the same as the interferometry of the phantom pearl paint or two different phases Pearl paint formulated with magic-colored pearlescent pigments and transparent organic or inorganic pigments can produce a distinct "color transfer effect" For example, the coloring of the resin with the color of the eipho-green and the addition of the magic olive green pearly pigment made of the pearly finish paint its green tone is very attractive The coating film formed by the construction of this paint on a conventional black primer shows a bright olive-green pearl from a dark-green viewing angle The camouflage-colored sapphire blue-pearl paint, made with the blue color, is constructed in conventional white primer with a positive view angle for milky white while the viewing angle shows sky-blue pearly light similar to group green coloring in the pearly paint color must pay attention to the following points: the first pearly pigment is best and transparent pigments for Wucuto must not be mixed with opaque pigments such as titanium white, chromium pigment, cadmium pigment, iron oxide pigment and metal pigment; The preparation of pearly finish paint should be made with a higher base ratio Usually should make the pearl pigment in the resin substrate quality ratio of about 6% but not more than 8% will affect the pigment sheet in the coating film of the directional arrangement to reduce its pearleffectn effect Pearly finish escupand is generally used in the three-way coating system of primer-face paint-cover varnish 5 Color Pearl Art Paint Phantom Pearl Pearl Art Coatings, also known as Pearl Cloud Paint or Pearl Ylack Fantasy Paint is the latest generation of decorative art paint is now widely used in race cars, rowing boats, overhead ropeway car boxes, leisure and recreation facilities outside the coating The magic-color pearl-light art coating makes full use of the theory of surface tension in the physical chemistry of modern coatings, the theory of solution volatile gradient, the theory of dissolving and dissolving, the use of paint diseases such as floating color, shrinkhole, biting bottom, hair flower, seepage and so on when coating the coating, and using the magic-color pearl-light pigment as the effect pigment The pattern pattern made with this magic pearl yading art coating is very natural and realistic, both to make natural marble patterns or cloud patterns as needed, as well as to produce abstract art patterns with multiple light-color effects Illusion pearly art coatings are usually composed of different color base coatings, medium coatings and surface coatings from the construction angle There are also medium coatings divided into several layers and several colors The principle and method for producing the pattern are described below 5.1 The addition of the surfactant reducethes the surface tension of the surface coating to a minimum when the medium coating is not completely dry and sprays the surface coating into a cloud on the medium coating with a large diameter gun nozzle The surface coating automatically extends and penetrates into the color-soluble and coordinated pattern of the bottom, middle and surface coatings of the undried medium coating due to the small tension The amount of magic-color pearl eads added to the medium coating and surface coating coating is usually 1% to 3% The control of the solid sprigs of each layer should decrease from the inside out The author has used conventional white primer - transparent iron oxide red coloring magic gold purple pearl coating - blue coloring magic color gem blue coating using the above method construction to obtain a very beautiful and realistic similar blue peacock feather pattern and excellent reproduction 5.2 According to the volatilization speed of different solvents to produce patterns
using different volatile speed solvents respectively formulated bottom, medium and surface coatings caused by the tension difference between layers such a large tension coating will automatically shrink the tension of small coatings will automatically expand and penetrate into the tension of the coating to produce patterns 5.3 The pattern is produced using differences in different coating characteristics
in this type of phantom coating the base coating is a less tension-high water-based coating for a less tensionsolvent coating coating for a solvent-based coating with smaller tension In the coating and surface coating on the tension of the base coating will occur surface expansion phenomenon combined with the solvent and the film-forming effect of the insosymptomading to form an artistic pattern 6 Conclusion
Pearl coating son will be the mainstream of high-decorative coatings in the present and future In particular, the production technology and application technology of mica titanium pearlescent pigment have become increasingly mature and the production cost is relatively low, and its multi-color effect is the root cause of its leading in modern decorative coatings When the mica titanium pearlpigment came out soon after it was predicted that pearlescent pigment will gradually replace the status of metal flash aluminum powder, its formulated pearl coating will become the mainstream of the car flash paint now this prediction is becoming a reality At present, in many synthetic new materials with multiple color effect and comparable to the nano-scale titanium dioxide commonly known as "transparent titanium dioxide." Although it also has multiple light-color effect in high-decorative automotive coatings to show a good prospect, but its high manufacturing costs combined with the purification of powder, particle collection and storage, particle size and shape control, precision grading, analytical testing and other aspects of many technical problems to be solved estimated that in the future for a long time can not be accepted Therefore, industry insiders assert that the mica titanium beads and their position in high-decorative coatings are established and stable at least until the middle of the next century To this end, we must seize the opportunity to actively strive to establish china's characteristics of pearly pigments, coatings research, development, production, application system to catch up with the world's advanced level to make our due contribution