Author: doPowder
Zinc casting can be powder coated
zinc casting can be powder coated A cast part will have porosity that may cause blemishes in the coating at high temperature. Air that is trapped near the surface may expand and rupture the film during the cure process. There are several ways to mitigate the issue. You can preheat the part to drive off some of the trapped air that causes the problem. Heat the part to a temperature about 50°F greater than the cure temperature, cool it down,Read More …
Customer decides MDF powder coating powder quality
Customer decides MDF powder coating powder quality What level of quality MDF powder coatings require is ultimately up to the customer. The various requirements of customers for MDF powder coatings are very important. For the production of TV cabinets, monitors, bathroom furniture or cabinet doors, MDF coatings are very different. To decide what powder and quality MDF and paint line design to use, we must first understand the quality requirements of customers When it comes to achieving high quality MDFRead More …
What Is the Challenges for MDF Powder Coating
Challenges for MDF Powder Coating China’s fiberboard annual output of more than one hundred million cubic meters. MDF (medium density fiberboard), the annual output of about 30 million cubic meters of 16mm specifications operator, light MDF there are about 1.8 billion square meters. With the technological development outside of MDF fiberboard such as popcorn board, etc. can also be powder coating. Expected to have a potential market of hundreds of thousands of tons of powder volume. In other words, theRead More …
Suitable temperature for Waterproof coating
Waterproof coating selection characteristics of the solution, nano-ceramic hollow particles, silica alumina fibers, all kinds of reflective material as the main raw material, thermal conductivity only 0.03W/mK, can effectively suppress shielded infrared heat radiation and heat conduction. In the hot summer, at a temperature of more than 40 ℃, it would be inappropriate to do waterproof, for the following reasons: queous or solvent-based waterproof coating construction under high temperature conditions will rapidly thickens, cause priming difficulties, affect the construction quality;Read More …
D523-08 Standard Test Method for Specular Gloss
D523-08 Standard Test Method for Specular Gloss This standard is issued under the fixed designation D523; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval . A superscripl epsilon indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense . 1.Scope OfRead More …
Corona and tribo charging technology
Understanding the differences between corona and tribo charging, assists in deciding which technology is best for an application. Each type of charging has typically been used for specific industries. Tribo charging has typically been used in industries which require epoxy powder or products that have intricate shapes. Insulating products such as electrical equipment that only require protective coating are prime users of tribo charging guns. This protective coating is generally;epoxy due to its tough finish. Also, industries such as wireRead More …
Coil powder coating technology progress
Pre-coated coil can be used in building internal and external wall panels, and there are broad prospects in the appliance, automotive, metal furniture and other industries. From the 1980s, China began to introduce and absorb foreign technology, especially in recent years due to the building materials market and the automotive electronics market costs and environmental requirements,a large number of domestic coil powder coating production line launched The powder coating is known for its high efficiency and environmental protection,China has becomeRead More …
Necessary laboratory equipment for testing powder coating in application
LABORATORY EQUIPMENT Equipment necessary for testing the pre-treatment chemicals, rinsing water and final results Tests of pre-treatment chemicals to be performed according to suppliers’ instructions Conductivity measurement gauge for evaluation of final rinse Temperature recorder Coating weight equipment, DIN 50939 or equal Equipment necessary for testing the powder coating Film thickness gauge suitable for use on aluminum (e.g. ISO 2360, DIN 50984) Cross hatch equipment, DIN-EN ISO 2409 – 2mm Bending test equipment, DIN-EN ISO 1519 Indentation test equipment, DIN-ENRead More …
Definitions for corrosion classification
As an aid in finding what requirements should be made for pre-treatment, we can define different corrosion classification: Corrosion Class 0 Indoors with relative humidity over 60% Very little corrosion risk (aggressivity) CORROSION CLASS 1 Indoors in non-heated, well ventilated room Little corrosion risk (aggressivity) Corrosion Class 2 Indoors with fluctuating temperature and humidity. Outdoors in inland climates, far from sea and industry. Medium corrosion risk (aggressivity) CORROSION CLASS 3 In densely populated areas or near industrial areas. Above open waterRead More …
Tetramethoxymethyl glycoluril (TMMGU),TGIC Replacement Chemistries
Tetramethoxymethyl glycoluril (TMMGU), TGIC Replacement Chemistries Hydroxyl polyester/TMMGU combinations,such as powderlink 1174,developed by Cytec, may offer an excellent opportunity to replace TGIC in applications that require thinner film builds. As this chemistry’s cure mechanism is a condensation reaction, some of the application problems described in the section on HAA curatives also occur with this curative. However, recent evaluations and data show that pin hole free coatings can be obtained with hydroxyl polyester / TMMGU combinations even when film builds exceedRead More …
Antimicrobial Coatings
Antimicrobial coatings are being used on a generous scale, in many ranges of application, varying from anti-fouling paints, coatings used in hospitals and on medical equipment, to algaecidal and fungicidal coatings in and around the house. Until now, coatings with added toxins are being used for these purposes. A growing problem in our world is that on the one hand, for reasons of health and environment, more and more biocides are being prohibited, while on the other hand bacteria areRead More …
Particle size distribution analsis for powder coating
Particle size distribution analsis for powder coating laser particle size analyzer test results: Average particle size (median diameter), the boundary of particle size and particle size distribution of the dispersion. The average size of the sample is less than and greater than 50% of particles. The boundary particle size: closer to the common sense to the maximum and minimum particle size. However, the maximum and minimum particle size to describe the upper and lower limits of the sample particle sizeRead More …
Plasticizers in Coating Formulations
Plasticizers are used to control the film formation process of coatings based on physically drying film forming materials. Proper film formation is essential in order to meet demands on specific coating properties such as dry film appearance, substrate adhesion, elasticity, in combination with high level of hardness at the same time Plasticizers function by reducing film formation temperature and elasticize the coating; plasticizers work by embedding themselves between the chains of polymers, spacing them apart (increasing the “free volume”), andRead More …
What Cause The Burning Explosion of Powder Coating
What Cause The Burning Explosion of Powder Coating The following aspects are the factors that lead to the burning explosion of powder coating (A) The dust concentration exceeds the lower limit Due to these reasons, the dust concentration in the powder room or workshop exceeds the lower explosion limit, thus forming the main conditions for powder burning explosion. If the ignition source is moderate, burning explosion are likely to occur (B) Powder and paint shop mixing In some factories, dueRead More …
Safe Storage Of Powder Coating
Proper storage for powder coating prevents particle agglomeration and reaction advancement, and ensures satisfactory application,this is pivotal. During application powder coatings must be easily fluidizable, free-flowing, and capable of accepting and maintaining a good electrostatic charges. Factors affecting powder coatings storage The key factors affecting powder coatings storage can be identified as: Temperature Moisture / Humidity Contamination Direct sunlight The recommended optimum conditions for storage of powder coating are: Temperature < 25°C Relative humidity 50 – 65% Away from directRead More …
How to Wipe Out Orange Peel During Electrostatic Powder Painting
Achieving the right amount of electrostatic powder paint on the part is very important for durability reasons as well as eliminating orange peel. If you spray too little powder on the part, you will most likely end up with a grainy texture to the powder also known as “tight orange peel.” This is because there was not enough powder on the part for it to flow-out and create a uniform coating. Besides the poor aesthetics of this, the part willRead More …
Bending Test And Adhesion of FBE powder coating
Adhesion of FBE powder coating A cupping tester is mainly used to determine the adhesion of FBE powder coating, and Fig.7 shows the test principle of the cupping tester. The head of the cupping tester is spherical, pushing the back of coated panels to test whether the positive film cracked or separated from the substrate. Fig.8 is a cupping test result of the epoxy powder coating. It could be seen that the FBE powder coatings that are not filled withRead More …
Some Points to Know the Quality of The Powder Coating Powders
Exterior Appearance Identification: 1. Hand Feel: Should feel silky smooth,loose, floating, the more smooth loose of the powder, the better of the quality, on the contrary, powder feel rough and heavy, poor quality, not Easy spraying, powder falling twice more wastage. 2.Volume: The larger of the volume, the less filler of the powder coatings, the higher of the cost, the better the quality of the coating powders. On the contrary , the smaller of the volume, the higher content ofRead More …
Differences Between Powder Coatings Vs Solvent Coatings
Powder Coatings PK Solvent Coatings Advantages Powder coating does not contain organic solvents, this avoids environmental pollution caused by organic solvent coatings, fire hazards and organic solvents waste and harm to human health; powder coatings do not contain water,water pollution problem can be avoided. The biggest feature is that the over sprayed powders can be recycled with high effective utilization.With a high recovery efficiency of the recovery equipment, the utilization of powder coating is up to 99%.Powder coatings give highRead More …
Heat Transfer of Hot Dip Aluminizing Coating During Solidification
Hot dip aluminizing coating is one of the most effective methods of surface protection for steels and is gradually gaining popularity. Although the pulling speed is one of the most important parameters to control the coating thickness of aluminizing products, however, there are few publications on the mathematical modeling of pulling speed during the hot dip process. In order to describe the correlation among the pulling speed, coating thickness and solidification time, the principle of mass and heat transfer duringRead More …
Study of Superhydrophobic Biomimetic Surfaces
The surface properties of materials are very important, and researchers attempt all sorts of methods to obtain materials surfaces with required properties. With the development of bionic engineering, researchers are paying an increasing attention to biological surface in order to understand how the nature can solve engineering problems. The extensive investigations on biological surfaces have revealed that these surfaces have many unusual properties. The “lotus-effect” is a typical phenomenon that the natural surface structure as blueprint is used to designRead More …
Superhydrophobic Surface Can Be Prepared by Two Methods
People know the self-cleaning lotus effect for many years, but can not make the material as the lotus leaf surfaces. By nature, the typical superhydrophobic surface – study found that lotus leaf, constructed with a special geometry of roughness in the low surface energy solid surface plays an important role on superhydrophobic.Based on these principles, the scientists began to mimic this surface. Now, research on rough superhydrophobic surface has been quite a lot of coverage. In general, the superhydrophobic surfaceRead More …
Self-cleaning Effect of Super Hydrophobic Surface
Wettability is an important feature of the solid surface, which is determined by the chemical composition and morphology of the surface. Super-hydrophilic and super hydrophobic surface characteristics are the main contents of invasive studies. The superhydrophobic (water-repellent) surface generally refers to the surface that the contact angle between water and surface is greater than 150 degrees. That people know superhydrophobic surface is mainly from plant leaves – lotus leaf surface, “self-cleaning” phenomenon. For example, water droplets can roll to rollRead More …
What is Electrostatic Painting Process
Electrostatic painting is a process in which a spray gun tip is electrostatically charged; making the paint charged electrically; thereby allowing the paint to be attracted to a grounded surface. This process wastes almost no paint through normal air flow, wind, or dripping. This is because the paint particles are actually attracted to the surface you are painting like a magnet. However, in order for the process to work the object you are painting has to be grounded. Electrostatic sprayingRead More …
Research for Corrosion Resistance of Hot dipped Galvalume Coating
Hot-dipped Zn55Al1.6Si galvalume coatings has been widely used in many fields such as automobile industry, shipbuilding, machinery industry etc, owing not only to its better anti-corrosive performance than that of Zinc coating,but also to its low cost (the price of Al is lower than that of Zn at present). Rare earths such as La can hinder scale growth and increase scale adhesion, thus they have been employed to protect steels and other metallic alloys against oxidation and corrosion. However, there are onlyRead More …