Overview of the hottest pigment additives and intr

2022-09-19
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Overview and performance of pigment additives (IV)

15 Brightness and brightness loss

there are many factors related to the brightness of the coating, such as the color of the final processing, the angle of observation, the angle of reflection, the surface form, and the smoothness of the coating. Generally speaking, brightness is a property of surface light reflection. Will your computer suddenly crash? Answer: it is usually the same as the luminous property and the clarity of the reflected image. If the PVC of the same pigment is the same, the paint base material with good wettability will produce a brighter film than the base material with poor wettability. Additives that can improve the brightness also tend to improve the wetting characteristics of paint substrates. Such additives include zinc naphthenate, various amines, yolk and fatty acids that can be used as a reference for users

there may be the following reasons for the loss of brightness:

(1) slowly develop fine wrinkles, which can be improved by adjusting the content and type of desiccant and metal in desiccant

(2) exposure to ultraviolet light causes degradation of the film surface, and the degree of degradation can be minimized by using powdered titanium dioxide

(3) the components of the base material are improper and lack brightness durability. Some components, such as fatty acids, can be added to the base material

(4) the loss of brightness will occur in some paint and enamel, which can be remedied by changing the composition of the base material

(5) reactants that reduce brightness are formed, such as soaps

(6) polymerization continues in the dry film, making the brightness lose. The improvement method is to select the appropriate base material, processing method or pigment

16. Flat light

sometimes it is necessary to obtain a dim coating effect. If pigments are used, PVC can be added to achieve a clear flat light effect. The simplest method of coating is to apply diatomite or amorphous silicon oxide

17. Brushing

poor brushing performance refers to the continuous dragging phenomenon when brushing paint. There are many reasons for this phenomenon, such as improper coating formulation and poor compatibility of base material components, resulting in thickening or gelatinization. Adding coupling solvent or high solvent solvent and heating paint can be corrected; Conversely, painting on a cold surface often produces drag. Good brushing performance requires that the painted surface should be connected with the painted surface within the interval. Within a certain interval, the adjacent coating needs to have enough fluidity so that it can contact the previous brushing surface. Adding more base materials, using non-volatile solvents or adding additives can improve the brushing properties of the paint

18. Color durability

films of white, light light or transparent colors will turn more or less yellow or brown due to sunlight, artificial light or heat, and baking processing will also produce the same results. This change is partly due to accelerated oxidation and partly due to decomposition, which usually produces acidic products. The reason for yellowing may be the base material, pigment or other ingredients, especially the desiccant, or a combination of reasons. Generally speaking, the base material has the greatest influence on the color of the film. The length of drying time, the temperature and the surrounding climate will affect the color of the base material

adjusting relevant factors can improve the durability of color, such as adding additives. For outdoor applications, the most effective is UV, which is said to be such a high-end external light absorber, which can reduce the role of UV. Suitable for indoor applications are some wetting agents with excellent performance

19. Penetrability

the so-called penetrability refers to the performance of the coating penetrating or invading into the surface on the application surface. Good penetrability is often related to good wetting base material, but a good wetting base material is not necessarily an infiltration base material. The permeability is neither good nor bad. 2.6 the upper plane of diaphragm and end plate should be flush depending on the situation. Some additives can improve permeability

20. Wrinkles

wrinkles are the phenomenon of folding on the surface of the film when it is dry. The relevant reasons are application, formula, or both. Excessive thick coating, or sometimes excessive use of desiccant, often leads to wrinkles; When there is skin on the surface of the coating, the drying under the surface will expand the surface and cause wrinkles; Sometimes excessive humidity changes during drying will also lead to wrinkles

in adverse circumstances, wrinkles can be avoided if the film is thin and uniform. Adding too much linseed oil to the paint will promote wrinkles, or uneven or even cracking of the surface. If the paint concentrates too much at a certain place, wrinkles may also form. Generally, the final processing with baking treatment can avoid wrinkles better than drying in air. There are several ways to reduce wrinkles:

(1) reduce the amount of desiccant

(2) use less cobalt desiccant, increase the amount of lead desiccant, or use zinc naphthenate

(3) when there is lead, calcium naphthenate can be used

there is a kind of coating that needs wrinkles, that is, the so-called wrinkle processing. In this case, the base material is very important, and appropriate desiccants, such as cobalt manganese desiccants, should be selected

21. Colloidal liquid guarantors and base agents

colloidal liquid guarantors and base agents include many substances, including methyl cellulose, propionate, starch, carbonyl cellulose, hydroxyethyl cellulose, etc. in linear form, casein, soybean protein, etc. in three-dimensional form. Appropriate use can increase viscosity and stabilize colloidal liquid, while preventing their particles from approaching each other and connecting together. These substances can also often improve the coating properties without affecting the properties of the film

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