Powder coating components
The overwhelming success of any coating powder depends on the measurements of the equipment, the nature of the powder, its composition and its condition.
There is a variety of powder, which can choose from, the final selection will depend on the final use requirements of the coated surface.
In thermoplastic systems, the polymer is usually a molecular weight, low melt, flowing during fusion, and immediately passes any chemical transformation to any processed or coherent heat. Once connected to this condition, it can not be repositioned to any plastic case. As is the case with thermoplastics.
The solidification reaction, in the thermocouple powder, occurs between the specialized (reactive) metal parts of the resins and the special metal parts of the processing agent. It is obvious that, to obtain a smooth layer, the polymer must be transformed into a soft layer, before the process begins.
The powder is a harmonic component, where the temperature of the lining is balanced, with the properties of viscosity, fusion, and speed of hardening. As with solvent-based coatings, heat-tight powder can be installed to produce decorative coatings, special effects of aluminum, bronze, metalic, distinctive texture, and strong, low-gloss effects and finishes.
Installation of powder :
The main components of the solid powder are:
• Hardness factor, help, tie, or handle
• Additional flow control materials
The selection of components affects the following characteristics:
• Film properties such as gloss, color, hardness, flexibility, cohesion, and chemical resistance.
• How to use.
• Processing time, temperature.
Solid grades are used for resins, with powder coating. The choice of appropriate grades is very important, such as the properties of the coating layer, the leveling, the flow, and the melting point. The Aczoneoplastic powder enhances its UK-based Polymer Innovations facility, which is dedicated solely to research and innovation in the field of polymers.
Resins, which have a softening point, typically range from 70-110 ° C. Resins, which have a low melting point, may have a real "kneading" tendency during storage and have a distinct degree of flow during processing. Therefore, only a low degree of "sharp limb cover" is obtained. In contrast, these resins, which have a softening point, may be higher with insufficient flow during treatment and tend to show the effect of orange peel, but the coverage of the sharp edges is good. In addition, there is a sustainable risk, which is the interaction of the most solid factors with polymers, at the high processing temperatures required during the manufacturing process.
Factor (s) of hardness, assistive factors, hardening factors, or treatment factors :
The method of manufacturing, use, treatment, and properties required in all coatings is influenced by the choice of the treatment agent used with a particular type of polymer used in the installation. The hardness factor must be ineffective at room temperature, which remains constant at 100 ° C, and the reaction must occur completely starting from this temperature, temperature 180 ° C. Interaction should not be too fast to prevent the full flow of molten resins, but the very long processing time should be avoided for commercial considerations.
Pigments and solvents :
The pigments currently used in conventional surface coatings, which carry solvents, can be used with powder coating, provided they are chemically inert, fast resistant to light, and heat.
Titanium dioxide is also used by default, in the manufacture of colors, white, pastel and light only. Carbon black is used, to manufacture black and gray colors. To obtain high-quality color paints and to use a variety of organic and inorganic pigments, although at the same time the focus has shifted to organic species; there has been a reduction in the use of heavy metals, such as lead. However, some red organic colors tend to react during treatment, leaving them to gloss and clean; so careful selection is important to ensure stability. Aluminum powder and bronze are used to provide metallic effects.
Certain elastic, inorganic materials can be incorporated into the compositions, without reducing the properties of gloss, flow, or mechanical coating. Mortars typically have high quality densities, and although the cost of raw materials is low, they have a negative impact on the powder-covered area. The real economies of these materials can be calculated by calculating the value of the painted unit per unit of powder. Other types of mortar can also be used; to adjust the level of gloss, and the appearance of coatings as needed.
Additional flow control materials :
After selecting suitable resins, hardness factor and pigment system, modifications to the structure are usually required to modify the properties of the coating layer and flow to suit the application and treatment conditions.
It is necessary to incorporate control factors, in the flow, without which the coating powders tend to be punctured, skewed, and deformed during treatment, and the effects of orange peel may appear on them. Flow control factors reduce the tendency of resins to deviate by reducing surface disturbance and by enhancing flow, resulting in smoother layers. Acrylic polymers and other resins have been successfully used in this field.
The coatings may tend to be sporadic, flowing very rapidly, providing "weak cover for sharp edges". To provide adequate coverage for these parts, and to prevent relaxation, they may use fibrillating agents such as organic derivatives of mantmorillonite, well-separated silicates, and other solvents. However, they must be chosen wisely, otherwise the properties of the coating layer, such as gloss, color, may be affected.
Epoxy powder :
This powder can be installed to provide soft, high gloss, cohesive, flexible, and excellent chemical resistance. Its main drawback is its pronounced tendency to yellow at high temperatures or when exposed to daylight. In addition, this powder quickly converts to chalk, on external surfaces, however, the safety of the coating layer on the outside surfaces is excellent. Treatment of epoxy powder is an additional mechanism, and no volatile material is present, emitted during heating.
Polyester powder :
This powder has excellent external bearing strength, with high resistance to yellowing under the influence of ultraviolet radiation, and should be heated for long periods and at high temperatures, compared to epoxy powder. Polyester powder resistance to chemical agents is just below powder.
Polyester and epoxy powder powder :
This powder, a class of solid powder, is widely used. Epoxy resin is a catalyst for polyester resins. Based on the selection of resin and its proportions, the properties of the mixture powder are combined between pure epoxy and pure polyester. The presence of this type of epoxy resins, resins are subject to alteration, on external surfaces.
Polyurethane powder :
Polyurethane powder contains powder properties, which contain hydroxy, which interact with the covered (or retained) isocyanates. This powder provides complete chemical, physical properties, as well as good external bearing strength.