What effect does pigment performance have on the quality of coated paper?
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The type and nature of the pigment play an important role in the optical properties, physical properties and printing properties of the coated paper. Therefore, it is very important to select the appropriate pigment for the pigment in the coating formulation when applying the processed paper. This article describes the effects of pigment properties on the quality of coated paper.
The main function of the pigment is to fill and level the surface of the paper, making it a uniform and uniform print surface and improving the appearance of the coated paper. In order to meet the needs of paper coating, the pigment must have certain physical and chemical properties. The basic requirements are: good dispersion in water, correct particle size composition, crystal structure, high opacity, high whiteness of water absorption. It has low properties, good anti-wear performance, strong chemical stability, good adaptability to other components in the coating mixture, less adhesive content, and if it needs to be dyed, it requires high tinting strength and color durability, and low cost. The performance of the coated paper in the mountain is mainly determined by the fact that it is very important to coat the formula towel with a suitable pigment and a suitable pigment ratio. The pigment component of a coating formulation is 70% to 90% of the weight of the most soil. They usually exceed 70% of the total volume on the rest, so they are the most important component in the coating formulation. The following is a detailed description of the properties of the pigment:
1. Covering power The so-called hiding power or covering power of a pigment refers to the ability to cover the bottom layer when it is applied to a surface. This property is determined by the difference between the refractive power of the mountain pigment and the refractive index of the pigment and the folding rate of the dispersion medium. The stronger the refraction and reflected light of the pigment, the more opaque it is, and the more opaque it is. Sometimes the hiding power of a pigment is determined by its absorptive capacity, such as carbon black and small reflected light. However, due to its high absorption capacity, it is small transparent and has good hiding power. The pigment is coated on the epidermal blood of the paper and is present in the colloidal frlJ in the form of a suspension. "1, the adhesive publication has a great influence on the concealer of the pigment: the light is incident on the pigment through the adhesive, At this time, the light may not change the running speed, especially the slow running speed of the pigment or light, and the refraction or reflection from the pigmented soil. The hiding power of the pigment in the same adhesive J is refracted by the pigment and the adhesive. The difference in the index is determined. The larger the difference, the greater the hiding power of the pigment.
The hiding power of a pigment depends on its structure and determines its dispersion. As the degree of dispersion increases, the hiding power of the pigment also increases. At this time, as the number of reflective surfaces in the pigment increases, when the diameter of the particles reaches the same length as the light wave, the increase in hiding power stops, such as continuing to increase dispersion. At the same time, the pigment begins to become transparent, and becomes transparent when dispersed in the molecular state, so that the pigment can no longer be an obstacle to the passage of light.
2, crystal structure ordinary coating pigment crystal structure can have five kinds of most basic crystal system: tetragonal system, six bending tester square crystal system, rhombohedral crystal system, rhombohedral hexagonal system, single cattle line. A single crystal or a crystal lattice assembly can be used to describe the entire shape of the pigment particles, such as a layered body, a needle-like body, or a frond body. A natural pigment particle is a non-ideal sphere particle. The viscosity, fluidity, dispersibility, surface coverage and ink receptivity of different crystal tilts have different effects. For paint printing paper, the paint prepared by the pigment of the sheet structure has a fluidity and dispersibility compared with other ones. The shape is good, which is also advantageous for surface coverage and ink reception.
3. Particle size and its usual pigments are present in a state of flocculation of aggregates of extremely fine particles, which are rarely dry-like.
The particle size refers to a so-called equal spherical particle diameter which is obtained by dispersing a pigment particle in a flocculated state into a medium particle or a small aggregate and averaging a spherical shape. The size distribution of the pigment particles is not uniform, and the proportion of the particle size of the mustard constitutes the particle size distribution of the pigment particles. The size and distribution of the particle size can affect the sedimentation stability, viscosity, fluidity and amount of adhesive of the coating. It has great surface strength, gloss, smoothness, whiteness and printing performance after coating. The effect, the pigment particle size of the coating can not be too large, generally around 0.5-sum, and the particles below uZm account for 80%-100%. Electronic balance
4, gloss and tinting strength Gloss is a strong and uniform light in a certain direction on the surface, the perception of the optic nerve caused by reflection. When the strong light is reflected in different directions, a feeling of dull gloss is produced. When the light reflected on the surface is very weak, there is no feeling of luster. The condition that the film can have a gloss on any of the smooth surfaces is that the diameter of the satin large particles of the pigment is smaller than the thickness of the film, and that all of the particles of the pigment should be inside the film. Such an in-film agitator also increases the gloss of the adhesive as the relative content of the adhesive increases (to a certain extent).
An important characteristic of a pigment is the consistency of the light that is reflected into the gloss and the reflected and scattered light that determines the color of the coating. This consistency is achieved when the color is determined by the very thin surface layer of the pigment. When the color of the pigment is determined by a very thick layer of surface, the light that reflects the dry luster may be inconsistent with the color of the object, and the pigment may change its white color by observing its direction. In this case. Pigment early bronze luster, which is a lack of its nature. The most important characteristic of a pigment is the tinting strength, that is, its ability to impart its own color when mixed with other pigments. The tinting strength is not often determined by the hiding power of the pigment. From this point of view, pigments can be divided into two categories: reflective pigments and absorbing pigments. For colored reflective pigments, its tinting strength is inversely proportional to the hiding power. For colored and black absorbing pigments, its tinting strength is proportional to the absorption of light, and of course inversely proportional to the hiding power. For white reflective pigments, its tinting strength is proportional to the hiding power. The amount of radiation increases as the dispersion of the pigment increases.
5. Specific surface area The specific surface area refers to the sum of the surface area of ​​the pigment particles per unit mass. The performance index is directly related to the particle diameter, and the smaller the particle size, the larger the specific surface. The surface area of ​​the pigment particles has an effect on the viscosity, fluidity, water retention and the amount of the adhesive and the "slip", gloss, hiding rate, ink receiving rate, etc. of the coated paper. A 22m2/g is good.
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