How to solve the color difference of real stone paint from production and construction

As we all know, real stone paint, as one of the exterior wall paints with rapidly growing market demand, is becoming more and more popular in the market. The real stone paint uses natural colored sand and water-based acrylic emulsion as the main raw materials. It is very difficult to keep the colors of different batches of real stone paint completely consistent. However, if it is effectively controlled from the source, production and construction, the color difference problem of real stone paint can be solved to a large extent.

1. Selection and control of production raw materials

The colored sand is the most fundamental source of the color difference of the real stone paint. Natural colored sand is mined from natural colored ore, crushed by artificial equipment, screened and packaged according to different particle sizes, the surface and interior of the ore are brought by natural factors such as different growth years and sunlight exposure, and the colored sand ore in the same area is crushed and processed And the color will vary, and some will vary greatly. Colored sand of the same color in different ore areas is more difficult to ensure the consistency of color.

There are many difficulties in producing real stone paint with the same color between batches. At the same time, the natural color characteristics of natural colored sand also have strict requirements on the manufacturers of colored sand or their downstream real stone paint manufacturers. Some large colored sand manufacturers use mixing equipment for mixing according to the requirements of downstream production, which ensures the color consistency of larger batches of colored sand, but the supply cost of the corresponding colored sand will increase accordingly, so The selection and control of colored sand and colored sand manufacturers has become the basis for controlling the color difference of real stone paint.

2. Technical level of production color matching

For the purchase of established real stone paint colored sand, production and R&D personnel are required to carry out color matching according to customer needs and existing colored sand types. Irregularity and unevenness of the coating film determine that its color cannot be corrected by professional Spectrophotometer computer color correction equipment, and can only be manually adjusted and corrected by relying on the experience of color matching engineers. This has relatively strict requirements for color engineers, such as familiarity with raw materials, sensitivity to color experience, proficiency and precise grasp of real stone paint formulas.

3. Production process control

The production of real stone paint is researched and developed according to the sample formula, then scaled up for production, and then modified according to customer needs. Raw material feeding in production should be done in a proper way. There is a principle of first shallow and then deep, first more and then less, from shallow to deep and easy, from deep to shallow and difficult. For colored sand with a small amount of addition and a darker color, the method of buckling and adding materials can often solve the number of repetitions of color correction to a large extent. At the same time, the addition and adjustment of various additives and the process control during production are quite particular. The combination of precise process control and rich production experience is a necessary condition for the production of real stone paint with small deviation and high degree of color matching with the incoming sample.

4. Construction method

The color difference of real stone paint is also closely related to the construction method and construction thickness. The same batch of real stone paint or the same bucket of real stone paint, the color of spraying and scraping will be slightly different. The real stone paint film sprayed has a strong texture, uniform dispersion, and relatively uniform color dispersion; while the effect of scraping is high in flatness, and it tends to collect large-sized sand particles inward, and fine sand is easy to float on the surface. mainstream color. Of course, this depends on the specific construction requirements and coating effects.

There are also differences in the color of different thicknesses of spray paint or scrape coating, so the consistency of the technique should be kept as far as possible during construction, and the construction should be as uniform as possible. Try to use the same batch of real stone paint on the same wall.