A paint paste is a colored paste composed of a pigment, an emulsifier, and water. The utility model has the advantages of small fineness, high uniformity, large hiding power, bright color, can be used together, and has good acid and alkali resistance, light resistance, weather resistance and abrasion resistance. Today, Quanxu Company will come to understand the basic knowledge of paint paste.
1. Coloring strength of color paste
For the comparison of water-based color pastes of different brands, color intensity is an important index, which reflects the color concentration, color performance and flocculation of pigment dispersion.This data is measured by the number of pigment pastes required to achieve 1/25 of international standard depth (ISD). The smaller the number, the higher the coloring power.The value represents the number of grams of color paste needed to be added to white paint, such as latex paint with white base paint titanium white content of 25% (1/25st).
2. Compatibility of color paste
The compatibility of color paste and application system is the key to affect the color floaters, flocculation and some surface defects.In the use of color paste color matching, we must do compatibility tests, additives can be used to solve the problem of compatibility with paint. Color paste into the white paint, generally match into a medium, light color, coating on the surface of the coating, to be about to coagulate, with the finger grinding coating surface part, dry after observation whether there is a significant color difference (visual measurement).Such as color paste fineness is not enough, poor dispersion performance all lead to color paste poor performance, will affect the reproduction of color paint.
3. The dispersion of color paste
The degree of deflocculation of pigment particles determined the size and stability of pigment dispersion.Generally speaking, it is impossible to achieve complete deflocculation (i.e. the uniform and stable existence of primary particles of pigment in the system), and it is only evenly distributed in the system in the form of the adhesion of pigment particles.A good color paste its degree of deflocculation is quite high, that is to say, the polymer is as small as possible, so as to have good coloring power, excellent color development and storage stability. If paste dispersion performance is bad, printing ink pigment flocculation in the body and basic material of white pigment and filler particles migration differences more easily, the differences often make the pigment flocculation body is no longer uniform distribution, when the film internal temperature, density and surface tension on the tiny differences, and have natural pigment flocculation body to participate in this movement, pigment flocculation body then separation, lead to float hair flower color.If the dispersion of color paste is good, it can avoid the occurrence of floating color and flower.Additional, the stand or fall of coating oneself dispersibility also affects the float color hair flower of color paint directly.
4. One of the structural properties of color paste
The light and weather resistance test of color paste is through outdoor exposure (such as Florida in the United States, our country's turufan have exposure field, etc.), but the actual outdoor exposure time is too long, now the general color paste performance test is mostly through instrument and equipment simulation test. Light resistance: outdoor acrylic latex paint is used to make 1/3isd and 1/25isd standard color samples for exposure. Xenon lamp light source (1000W) is used for 72 hours. 1-8 grade blue wool ruler is used for simultaneous exposure with the standard color samples. Weather resistance: outdoor acrylic latex paint is used to make 1/3isd and 1/25isd standard color samples for exposure, ATLAS artificial aging instrument is used for 500 hours of exposure, and ISD gray card is used for color difference rating, grade 1 is poor, grade 5 is good.
5. Color paste structure and performance of the second
The chemical resistance of water-based color paste is mainly acid and alkali resistance, that is, chemical transfer resistance.This property basically depends on the pigment itself, which must be considered in the outdoor color paste.General waterborne coatings are also required acid and alkali resistance, do not require resistance to organic solvents and other chemicals. Acid and alkali resistance: the color paste was dried (105 ℃) and placed in 1% sulfuric acid and 2.5% sodium hydroxide solution for 24 hours. Then it was taken out and washed to determine its acid and alkali resistance.According to the color infiltration and color changes, according to the grade 5 standard to evaluate, reach grade 5 shows excellent acid and alkali resistance, grade 1 shows very poor acid and alkali resistance.
6. Quality stability and storage stability of color paste
Generally, through strict control of production formula, raw materials, production process and finished products, we can ensure the consistency of solid parts, fineness, viscosity, coloring force, color exhibition, light and weather resistance, etc.Generally, the storage stability of water-based color paste is kept at room temperature of 25 ℃ for one year without obvious defects such as layering, caking, returning coarse, precipitation, etc., and there is no significant decrease in coloring power, color rendering and other physicochemical properties.Usually the aging can be accelerated by heat storage and freezing experiments, and evaluated by canning effect evaluation and color matching software.
7.How to choose color paste?
According to the coloring object and environmental requirements, color paste is mainly divided into two types of light fastness and light fastness.Generally, indoor in the system does not exist compatibility problems, to achieve color requirements, low cost as the principle, do not require light resistance. And outdoor use must consider the following factors: a.B. Chemical resistance (mainly acid and alkali resistance);C. Compatibility with the operating system;D. Coloring intensity, hiding power and transmissibility;E. matching between color paste and color paste;F. storage stability of color paste.Generally, external coating color retention of the color is quite strict requirements, so in the selection of color paste should pay special attention to the color paste light resistance, weather resistance and acid and alkali resistance.On the premise of good compatibility, coloring power, hiding power, color transfer and storage stability, color paste matching is also very important.Should be as much as possible to choose the monochrome printing ink color matching with good light resistance weather resistance, but in fact are composite color, so generally follow the inorganic and organic or inorganic, organic and light weathering function such as close as the principle, in order to ensure that outdoor color retention, can avoid the color paste weatherability can obvious difference, lead to longer lead to fade or coating defects such as uneven color and hair flower.
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