What should I pay attention to when switching from color paste to color powder in the production of pigmented paints?
Color pastes are commonly used as colorants in the production of pigmented paints. However, in order to reduce costs or to meet specific needs, it is sometimes chosen to switch from color paste to color powder. In this article, we will look at what to look for during the conversion process, such as dispersion effect, the amount to be added, and whether or not grinding is required.
01
Dispersion of Color Powder
Dispersion of color powder in pigmented paints is a critical step. Since the particle size of color powder is usually larger than that of color pigment, direct addition may not be easy to disperse uniformly, resulting in uneven colors in the final product. Therefore, efficient dispersing equipment must be used. Before adding color powder, it can be mixed with appropriate amount of solvent and additives to make slurry, which helps to improve the dispersion effect. In addition, the dosage of color powder can be gradually increased to observe the color change for better control of color consistency.
02
Adding amount of color powder
The amount of color powder added depends on the desired color depth and covering power. Since the coloring power of the color powder is usually stronger than that of the color paste, a smaller amount may be needed to achieve the desired effect. However, the exact amount to be added needs to be determined through experimentation to avoid excessive amounts resulting in too deep a color or too strong a covering power. At the same time, it is also necessary to observe the effect of color powder on other properties of the paint, such as viscosity, dryability, etc.
03
Whether grinding is needed
For the production of pigmented paints, grinding is an essential step, which helps the pigments to be better dispersed and improves the uniformity and covering power of the paint. For color pigments, the need for additional grinding depends on the particle size and the desired end result. If the particle size of the color pigment is small and it is evenly dispersed in the paint, then additional grinding may not be necessary. However, if the color is found to be uneven or lacking in coverage, an additional grinding step may be required.
In summary, when changing from color paste to color powder, the steps of dispersion, addition amount and grinding must be carefully considered and adjusted. Determining the optimal process parameters through experimentation is the key to ensuring the quality of pigmented paints. At the same time, continuous monitoring and optimization of the production process is also necessary to ensure product quality and production stability.
Weather-resistant, fast-drying, salt spray-resistant! Water-based light anticorrosive color paste is the right choice!
With the rapid development of various types of functionalized coatings, the specialization and functionalization of paint color paste has also become a new trend in its development. Its main function is to give the paint to the color, and in recent years the paint products to the direction of diversification, different systems under the color paste application environment is very different, the color paste requirements are also different. Therefore, the color paste system must have strong special performance to adapt to the coloring requirements under special environment.
According to the paint purchasing network, light anti-corrosion generally belongs to the C1-C3 corrosion protection grade, mainly used in some conventional corrosive environments, through the blocking of the surface coating, can effectively prevent the metal in the air, water, acid and alkali substances and microorganisms erosion and corrosion.
The selection of steel structure coating directly affects the life of steel structure parts. Steel structure coating preparation process, the addition of color paste products can not only make the finished coating appearance bright, a “circle” of the color paste products also need to meet the coating manufacturers in the water resistance, salt spray resistance and cost of many requirements. In recent years, Zhejiang Tianhe Resin Co., Ltd (hereinafter referred to as “Tianhe”) has accumulated a large number of successful project cooperation cases in such occasions as color steel tiles, steel structures, scaffolding and other occasions that require temporary protection, and the products are well known in the market for their outstanding performance advantages and reasonable prices.
Tianhe’s newly developed waterborne light anticorrosive special color paste is made of deionized water, high-performance pigments, special surfactants and so on through ultra-fine grinding and processing, and it is a set of color pastes with strong coloring power, bright colors and strong specialization designed for different requirements such as initial water resistance, drying water resistance, and salt spray resistance, etc. The series is made of acrylic acid, acrylic acid, acrylic acid, acrylic acid, acrylic acid, acrylic acid and acrylic acid.
This series of color paste is designed with acrylic, alkyd, epoxy ester and emulsion resin compounding system, which is widely used in steel structure, motor, engineering machinery, color steel tile and other fields because of its high cost performance.
Multi-color water-in-water color mixing refinement process! Paint manufacturers must see!
1 Multi-color paint toning overview
1.1 Receive order material
After receiving the sampling task order “sample contact list”, first review the single, according to customer demand, sample whether plane, gross surface or other requirements, sample size demand number, etc., whether equipped with wet material, according to the amount of demand for material.
1.2 Determination of color number
According to the sample color phase to determine and write the proofing sheet color number into the archives, and fill in the color number in the “sample contact sheet”.
1.3 Color mixing (see annex for specific operations)
1.3.1 Review the samples, samples, paint film and stone, etc., according to its overall color to determine the hue of the base color in the coating and the depth of the base color base material for the proportion, according to the amount of demand for the preparation of materials to adjust the color, and to fill in the color number of the sample contact sheet.
According to the amount of demand for the preparation of materials to adjust the color, the base color is ready, with a small roller will be uniformly coated in A4 cardboard to be used.
1.3.2 According to the sample to determine the number of color points and color shades to determine the ratio of base material, and then according to the number of color points for the deployment of color points.
1.4 Granulation (see annex for specific operation)
After mixing the color dots, according to the color density of the color dots and the size of the color dots, after the integration of the material formula, then according to the company’s fixed water, milk, color dots ratio for small samples of granulation.
Color point ratio for small sample granulation.
1.5 Spraying board color
To the spray booth will be granulated material according to the sample dilution density evenly sprayed on the previously coated A4 cardboard, generally need to be sprayed twice, into the oven to dry and come to the sample for comparison and then according to the difference in hue for modification until it reaches a similarity of more than 90%, before the production of samples.
1.6 Configuration of wet materials
Sampling similarity to meet the requirements, configure wet material, after confirming the wet material, customer samples / boards, color confirmation samples, wet samples and the “sample contact sheet” forwarded to the sample department for sample production; the number of wet material configuration: the amount of customer samples, customer wet material, the amount of self-retained samples required, as well as the various color points to stay in the sample.
1.7 Record
The whole process of color matching needs to be recorded in the original formula – “color formula and process original single”, and requires the recording of the formula is clear and accurate, after the record is filed for use. After each color is adjusted, record the start time and end time of color mixing.
1.8 Sample and wet material
Each time the bottom color of the color point is left 100G, along with the (sample department spraying) together with the spraying of cardboard samples for classification, in order to prepare for the production of the color to be used.
1.9 Sanitary organization
After the work is completed, clean and organize the worktable to keep the workplace clean and clean.
2 Colorful paint mixing steps
Colorful coloring is carried out according to the following steps:
Determine the base color of the medium paint → Determine the number of color points → Adjust the color points → Determine the granulation formula → Granulation → Spraying → Modify until qualified.
2.1 Determine the base color of the middle coating:
After getting the stone, three meters from a distance to the overall hue of the base color, Karamay grain gold, from a distance for the yellow system, it is determined that the yellow is the base color, such as the overall close to the white or light color, the flower white (DSQ-W) as the base material. If the overall color is dark or colorful, add 10%-50% of DSQ-W, the rest add DSQ-C, the overall amount of 100%.
Determine the base material after the beginning of the color, the color is determined according to the hue of the three color pastes, generally not allowed to exceed three, commonly used color pastes for iron red, iron yellow, carbon black, and the rest of the special color pastes are: phthalocyanine green, phthalocyanine blue, permanent solid purple, crimson, red, bright yellow and so on. Usually use iron red, iron yellow, carbon black, only special colors. These three kinds of color paste can not be blended, only when the use of other color paste. Of course, in the use of other color paste, can only use three.
Determine a good three color paste, it will be weighed and counted, and then in accordance with the first main color, then the secondary color and then the complementary color of the order of adding color paste, such as the deployment of a yellow, it is the first to add the main color paste yellow paste, and then add the red, and then the black, add the color paste, according to the specimen color in small quantities and slowly add, can not be added at once too much, in order to prevent the color is too dark.
In the hue and shade to reach 80% similarity, need to scrape the film drying, and then compared, after drying is usually placed in front of the stone three meters away from the distance. If you feel that the hue is very close to the overall color of the stone, the roll plate to be used.
2.2 Determine the number of color points:
After getting the stone, carefully observe the different colors on the stone, to determine the number of color points. Generally very conspicuous on the need to deploy, from a distance is not very conspicuous, or rarely only one, two such color points, can be ignored, do not have to deploy, the general number of color points controlled within eight. Try not to exceed eight, of course, except for special. Usually the most common general between five and six points. For example, Carmichael. Usually: warm white, warm yellow, orange, coffee, dark coffee, black and so on. After determining the name of the color point, the color point coding. (For coding, refer to Appendix A, Color Category and Shade Coding Chart)
2.3, adjust the color point:
Color point to determine the number of good, according to each color point of the hue and shades, to determine the base material ratio, such as lighter near white, you can add more BW-, and vice versa, less BW-, or do not add. Determined after the color point color blending, color point, color paste to be diluted with BQ-, the general dilution of BQ-: 100g, color paste to add 3g, that is, 100:3 dilution, all kinds of color paste are the same. Detailed color mixing process refer to the base color mixing process. For example, the warm white in the Kamai, usually close to the white, you can add more BW-, generally add the amount between 300-800, adjust the color point when the base material as a whole amount of 800g, add BW-, after the rest of the addition of BQ-, and then such as the coffee point of the color is very deep and very colorful, usually add less BW-, the amount of additions are generally between 0-100g, the rest of the addition of BQ-, such as the color point of the blending of good one by one, to determine the formulation of the pelleting is ready! Granulation.
2.4, determine the granulation formula:
First of all, according to the company’s granulation base ratio for the proportion: GL-S: 95, GL-R: 90, material: 100 (material 100 that is, all the color points need to granulate the sum) to determine the ratio of material, according to the number of stone points and the size of the proportion, such as black points in the carmac, orange and yellow points smaller, can be listed in a separate piece of the machine to play. The rest of the color points through visual inspection is about 1.5mm or so can be listed in a piece of 1.5mm screen for grain extraction. In addition, the black point and orange point is usually less just embellishment, proportioning can be allocated less amount, general warm yellow and coffee is usually more, can be allocated more.
2.5, granulation:
First weigh 75g isolation water with a 1L small can, to the above formula, for example, the isolation of water into two parts, a 1/3, a 2/3, and then machine the material according to the formula weighed into the 1/3 of the GL-S for machine, general small machine open to 450 rpm, the material will be put into the machine for machine, even speed to hit the stone on the size of the color point needed until.
Another part of the material weighed to 2/3 isolation water to get the granulation vacuum machine, with 1.5mm sieve for two times of the extraction of granules, pumping well after the two parts of the material together to add 75g, gently mix with a small spoon, can be used for spraying.
2.6 Spraying:
Before rolling a good primer A4 cardboard to get the spray booth on the spray table, to be put on the stable, and then make a good grain of material into a clean spray gun, the material pressure adjusted to the right, cover the material pressure cover, adjust the spraying air pressure, the sample for uniform spraying, into the oven to dry, and then the second spray, and then dry, and the stone block for comparison. (For specific spraying method, see Annex B: water-based colorful coating construction method)
2.7. Modification:
Comparison of dried cardboard and stone, towards the color of the stone, particle size, particle sparse density of the direction of modification, until qualified. For example, cardboard: compare with the stone is red and deep, it will be modified towards yellow and shallow direction, and vice versa towards reverse direction.
Water-in-water coding method:
DC-Y-0918 RC—represents: water-in-water colorful Y—represents: main color system 0918 represents multi-color stone sequence number
Water-in-water primer coding method:
DQS-Y0918 DSQ—represents: water-in-water colorful medium paint primer Y—represents: main color system 0918 represents sequence number
Water-in-water color spot coding method: BQY0918GN
BQ — represents the base material used to make a difference with the base color;
Y0918 — multi-colored stone sequence number (Y on behalf of the main color system);
GN (warm green) — color number;
Three parts of a color point code: meaning the warm green (GN) color point (GN) in the RC-Y0918 blended with the base material (BQ-, BW-) of the color mixing point.
No. Principle: In general, RC-Y-0918 can be followed by the suffix “S” on behalf of the addition of sand “AC” on behalf of the change in the size of the dots, changes in the number of color dots or changes in the amount of color dots. In other cases, the suffix cannot be added. It can only be renumbered.
3 Please water-in-water colorful coating construction method
I. Tools:
1. Air compressor: Requirements to achieve more than 8KG pressure supply and storage tank larger, and requires a uniform gas supply, can not be big or small.
2. Spray gun: according to the size of the construction area and the size of the main material sprayed particle size to choose a suitable good non-damage to the spray gun.
Second, the material pressure: uniform material pressure is the first condition of spraying the main material is generally controlled between 0.01 to 0.03, if you can evenly match the speed of the gun and spread evenly as qualified. (The actual construction can be properly adjusted to their own feel the most appropriate color pressure standard)
1. too large: easy to pile up and can not spray evenly, will cause hanging, can not achieve the desired effect of spraying.
2. too small: will cause no material, small material, so that can not be sprayed properly, will affect the spraying effect and construction time.
Third, air pressure: the air pressure of the spray gun is generally debugging the pressure valve at the end of the spray gun (pressure valve at the bottom of the air inlet hole is also the end of the handle) shall prevail (it is not recommended that another pressure gauge, if the pressure gauge debugging is not good enough to easily cause insufficient supply of air to affect the spraying), adjusting the air pressure can be the first pressure valve clockwise rotating to a complete shutdown, and then counterclockwise rotation of one and a half turns for the most appropriate pressure, of course, if this time there is not enough pressure, you can continue to a quarter-turn of the way to the end, the pressure valve will not be able to spray the results and construction time. Of course, if the air pressure is not enough at this time, you can continue to quarter-turn way to debug.
1. Air pressure is too large easy to break the main material color point, the spray effect is more fuzzy and pinhole-like color point more, color point around the explosion state, the overall effect will be gray and dark, can not achieve the desired effect.
2. Air pressure is too small color points will be piled up hanging not up to the size of the required spray color point effect. The effect of the material will be bent and sagging and show the state of the air.
Fourth, the construction environment: 1. Base surface treatment must be flat, the primer should be evenly rolled to ensure the uniformity of the color, otherwise it will affect the main material of the hair flower, can not make the overall color to achieve consistency. (The spraying method of fire surface primer can refer to the construction method of the required bone material for spraying)
2. Outdoor construction must be selected in sunny and dry weather construction, air humidity, will affect the drying speed of the paint and the main material will affect the construction effect of hanging. If you really need to construction can be used to improve the method of less spraying more ways.
Fifth, recognize the gun: to play a small sample of the gun as an example, the hopper is mainly used to contain the main material, air inlet holes are located at the bottom of the handle, adjusting the air pressure valve has been said earlier, the control valve is located at the upper end of the handle, the end of the gun needle is the thicker that is mainly used to control the amount of material out of the material, the general control of the material out of the material to be adjusted to the right position, too small will tear the color point, too big gun will not have force, generally adjusted to reveal two to three turns of the wire buckle is appropriate, such as the spraying of a small sample of the gun. Three turns of the wire buckle for appropriate, such as in the case of larger color points can be appropriately adjusted (generally more exposed wire buckle for large, and vice versa for small), adjusting the spray width valve, located in the upper end of the control of the discharge valve of the smaller is, according to the construction area can be adjusted appropriately to the width of the discharge degree of narrowness, clockwise for the narrow, counterclockwise for the wide. Of course, too narrow is also easy to cause color accumulation and shredding of color points, too wide spray color points will be more scattered will also affect the strength of the material, so only appropriate debugging. The nozzle is the small mouth of the main material when spraying. Pressure handle, located in front of the handle, when spraying to play a role in controlling the role of the material (role in the form of a pistol’s trigger), general spraying
