Author: doPowder

 

Smooth finishes and wooden UV powder coating furniture

Smooth finishes and wooden UV powder coating furniture

UV powder coating furniture with smooth finishes and wooden substrate UV Powder coating for Smooth, Matt Finishes Blends of specific polyesters and epoxy resins permitted the development of smooth, matt finishes for metal and MDF applications. Smooth, matt clear coats were successfully applied on hardwood, on veneered composite board such as beech, ash, oak and on PVC used for resilient flooring. The presence of the epoxy partner in the binder boosted the chemical resistance of all the coatings. The best smoothnessRead More …

Testing of Powder Coatings

testing of powder coatings

Testing of Powder Coatings Surface Characteristics Test Method Procedure (s) Primary Test Equipment Surface Characteristics     Smoothness PCI # 20 Smoothness Standards Gloss ASTM D523 Glossmeter Color ASTM D2244 Colorimeter Distinctness of Image   Visual Observations Contrast Ratio PCI #3 Special Substrates,   ASTM D2805 Reflectance Instruments Physical Characteristics Physical Test Primary Test Equipment Characteristics Procedure (s)   Film Thickness ASTM D 1186 Magnetic Film Thick Gauge,   ASTM D1400 Eddy Current Induce Gauge Impact ASTM D2794 Impact Tester Flexibility ASTM D522 Conical or Cylindrical Mandrel Adhesion ASTM 2197 Balanced-Beam Scrape-Adhesion,   ASTM D3359 Cross Hatch Cutting Device and Tape Hardness ASTM D3363 Calibrated Drawing Leads or Pencils Abrasion Resistance ASTM D4060 Taber Abrader and Abrasive Wheels   ASTM D968   Edge Coverage ASTM 296 Standard Substrate and Micrometer Chip Resistance ASTM D3170 Gravelometer   Test Method Procedure(s) Primary Test Equipment Environmental Characteristics     Solvent Resistance   MEK or other Stain ResistanceRead More …

Qualicoat-Test Methods and Requirements

Qualicoat-Test Methods and Requirements

Qualicoat-Test Methods and Requirements The Qualicoat-Test methods described below are used to test finished products and/or coating systems for approval (see chapters 4 and 5). For the mechanical tests (sections 2.6, 2.7 and 2.8), the test panels must be made of the alloy AA 5005-H24 or -H14 (AlMg 1 – semihard) with a thickness of 0.8 or 1 mm, unless otherwise approved by the Technical Committee. Tests using chemicals and corrosion tests should be performed on extruded sections made ofRead More …

Powder coating orange peels appearance

Powder coating orange peels

Powder coating orange peels appearance From shape visually or using mechanical methods of measurement shows instrument or via a bellows scan to assess and compare the powder coating orange peel appearance. (1) visual method In this test, the model of the double tube fluorescent. A model of reflective light source can be obtained by appropriately placed boilerplate. Qualitative analysis of the clarity of the reflected light from the visual assessment of the nature of the flow and leveling. In theRead More …

Coating forming process

Coating forming process

Coating-forming process can be divided into melt coalescence to form a coating film leveling three stages. At a given temperature, the control molten coalescence rate the most important factor is the melting point of the resin, the viscosity of the molten state of the powder particles and the size of the powder particles. In order to best coalescence of molten shall as soon as possible, in order to have a longer time to complete the leveling phase flow effects. TheRead More …

TGIC replacement chemistries in powder coating-Hydroxyalkylamide(HAA)

Hydroxyalkylamide(HAA)

Hydroxyalkylamide(HAA) TGIC Replacement chemistries As the future of TGIC is uncertain,manufacturers are searching for an equivalent replacement for it. HAA curatives such as Primid XL-552 ,developed and trademarked by Rohm and Haas,have been introduced. The chief drawback to such hardeners is that, since their cure mechanism is a condensation reaction, films that build to thicknesses exceeding 2 to 2.5 mils (50 to 63 microns) may display outgassing ,pinholing ,and poor flow and leveling . This is especially true when theseRead More …

Polyaspartic Coating Technology

Polyaspartic Coating Technology

The chemistry is based on the reaction of an aliphatic polyisocyanate and a polyaspartic ester, which is an aliphatic diamine. This technology was initially used in conventional two-component polyurethane solvent-borne coating formulations because the polyaspartic esters are excellent reactive diluents for high solids polyurethane coatings More recent developments in polyaspartic coating technology have concentrated on achieving low or near-zero VOC coatings where the polyaspartic ester is the main component of the co-reactant for reaction with a polyisocyanate. The unique andRead More …

AntiCorrosive Pigments

AntiCorrosive Pigments

The future trend in anticorrosive pigments is to obtain chromate free and heavy metal free pigments and to go in the direction of sub-micron and nanotechnology anti corrosive pigments and smart coatings with corrosion-sensing. This type of smart coatings do contain microcapsules containing pH indicator or corrosion inhibitor or/and self healing agents. The shell of the microcapsule breaks down under basic pH conditions. The pH indicator changes color and is released from the microcapsule together with corrosion inhibitor and /Read More …

How It Works-Tribo Charging Method

The charging of the powder particles in a tribo gun is achieved by the friction of two dissimilar materials coming in contact with one another. (See diagram #2.) In the case of most tribo guns,electrons are stripped from the powder particles as they make contact with the gun wall or tube which is typically made of teflon. This results in the particle giving up electrons which leaves it with a net positive charge. The positively charged powder particle is transportedRead More …

Corona Charging Method-How It Works

Electrostatic Spray Systems

In corona charging, a high voltage potential is developed at an electrode located in or near the powder stream. With most corona guns this occurs as the powder exits the gun. (See diagram #l.) An ion field is generated between the electrode and the grounded product. Powder particles passing through this field are bombarded with ions, become charged, and are attracted to the grounded product. The charged powder particles accumulate on the grounded product and are electrostatically retained long enoughRead More …

Why Powder Coating

Why Powder Coating

Why Powder Coating ECONOMIC CONSIDERATIONS The excellence of the powder-coated finish is accompanied by substantial cost savings, when compared to liquid coating systems. Since powder contains no VOCs, air used to exhaust the powder spray booth can be recirculated directly to the plant, eliminating the cost of heating or cooling the makeup air. Ovens that cure solvent-based coatings must heat and exhaust huge volumes of air to ensure that the solvent fumes do not reach a potentially explosive level. WithRead More …

Comparison between UV coatings and other coatings

uv coatings

Comparison between UV coatings and other coatings Even though UV curing has been used commercially for over thirty years (it is the standard coating method for compact disk screen printing and lacquering for example), UV coatings are still relatively new and growing. UV liquids are being used on plastic cell phone cases, PDAs and other handheld electronic devices. UV powder coatings are being used on medium density fiberboard furniture components. While there are many similarities with other types of coatings,Read More …

What is Polyurea Coating and Polyurethane Coatings

Polyurea Coating Application

Polyurea Coating and Polyurethane Coatings Polyurea coating Polyurea coating is basically a two-component system based on Amine terminated prepolymer crosslinked with Isocyanate which forms the urea linkages. The crosslinking between reactive polymers take place at a rapid speed at ambient temperature. Normally this reaction does not require any catalyst. Since the Pot-life of such coating is within seconds; special type of Plural Component spray gun is require to carry out the application. The coatings can build up to 500 toRead More …

What is Moisture-cured polyurethane

Moisture-cured polyurethane

What is Moisture-cured polyurethane Moisture-cured polyurethane is one-part polyurethane that its cure is initiatedly environmental moisture. The moisture-curable polyurethane is mainly consists of isocyanate-terminated pre-polymer. Various types of pre-polymer can be used to provide required property. For instance, isocyanate-terminated polyether polyols are used to provide good flexibility due to their low glass transition temperature. Combining soft segment, such as polyether, and hard segment, such as polyurea, provides good hardness and flexibility of coatings. Moreover, the properties are also controlled byRead More …

7 Standards To Test Weathering Resistance of Powder Coatings

Weathering Resistance Powder Coatings for street lamps

There are 7 standards to test weathering resistance of powder coatings. Resistance to mortar Accelerated ageing and UV durability (QUV) Saltspraytest Kesternich-test Florida-test Humiditytest (tropical climate) Chemical Resistance Resistance to mortar According to the standard ASTM C207. A specific mortar will be brought in contact with powder coating during 24h at 23°C and 50% relative humidity. Accelerated ageing and UV durability (QUV) This test in the QUV-weatherometer consists of 2 cycles. The coated testpanels are 8h exposed to UV-light andRead More …

Electrostatic Spraying Nozzle

Classification of electrostatic spraying nozzle

Classification of electrostatic spraying nozzle Electrostatic spraying can be divided into the way the air or hydraulic atomizing electrostatic spraying, centrifugal electrostatic spraying, etc.; Electrostatic spraying can be divided into the way the air or hydraulic atomizing electrostatic spraying, centrifugal electrostatic spraying, etc.; direct nozzle electrostatic spraying, electrostatic spray of Y-type nozzle target nozzle electrostatic spraying can be divided according to the different characteristics of the nozzle; in accordance with the paint can be divided into the different nature ofRead More …

Two strategies for designing coatings with exceptional mar resistance

hanger stripping in powder coating

There are two strategies are available for designing coatings with exceptional mar resistance. They can be made hard enough that the marring object does not penetrate far into the surface; or  They can be made elastic enough to recover after the marring stress is removed. If the hardness strategy is chosen, the coating must have a minimum hardness. However, such coatings may fail by fracture. Film flexibility is an important factor influencing fracture resistance. Use of 4-hydroxybutyl acrylate instead ofRead More …

Exterior architectural gloss coatings pigment selection

Wood Powder coating porcess

There are two primary types of TiO2 pigments: those which enamel grade performances below Critical Pigment Volume Concentration (CPVC), which corresponds to gloss and semi gloss powder coatings, and those improving spacing characteristics for above CPVC coatings applications (flat aspect). Exterior architectural gloss coatings pigment selection is based upon a good balance of properties associated to tight Particle Size Distribution which enables product to provide superior exterior high gloss.Within the extensive choice of pigments, the main ones for this applicationRead More …

Abrasive blasting for preparation of metal surfaces

Abrasive blasting

Abrasive blasting is most often used for preparation of metal surfaces of heavy structural parts, particularly HRS weldments. It is a very good way of removing the encrustations and carbonized oils that are characteristic of this type of product. Blasting operations can be manual or automated and they can be installed as part of a conveyorized powder coating system or as a batch process.The blasting device may be a nozzle type or a centrifugal wheel type. As previously stated, nozzleRead More …

UV-curable Powder Coatings Advantages

UV-curable Powder Coatings Advantages

UV-curable Powder Coatings Advantages UV-curable powder coatings is one of the fastest coating chemistries available. From start to finish the entire process for finishing MDF takes 20 min or less, depending on chemistry and part geometry, making it an ideal finish for applications that require a quick turnaround. A completed part requires only one coat, allowing increased production with 40 to 60 percent less energy than other finishing processes. The UV-curing process is much simpler than other finishing technologies. CuringRead More …

Factors affecting the leveling of powder coatings

the leveling of powder coatings

Factors Affecting The Leveling of Powder Coatings Powder coating is a new type of solvent-free 100% solid powder coating. It has two main categories: thermoplastic powder coatings and thermosetting powder coatings. The paint is made of resin, pigment, filler, curing agent and other auxiliaries, mixed in a certain proportion, and then prepared by hot extrusion and sifting and sieving. They are stored at room temperature, stable, electrostatic spraying or fluidized bed dip coating, reheating and baking melt solidification, so thatRead More …

Is fluidized bed powder coating a good fit for your products?

There are several questions that need to be asked. First, since fluidized bed powder coating generally applies a thicker coating,

There are several questions that need to be asked. First, since fluidized bed powder coating generally applies a thicker coating, can the end part withstand the dimensional changes? Unlike electrostatic coating, fluid bed coating will generally smooth over any small details in the parts, such as embossed serial numbers, metal imperfections, etc. This can be extremely beneficial for parts where Faraday Cage effects are problematic. Welded wire products are good examples. Electrostatic spray has a hard time getting into theRead More …

Difference Between Cold Rolled Steel and Hot Rolled Steel

Difference Between Cold Rolled Steel and Hot Rolled Steel

Difference Between Cold Rolled Steel and Hot Rolled Steel COLD ROLLED STEEL: The most common of the metals encountered by the jobshop powdercoater, this product is roll formed to a close tolerance and a fine surface finish, suitable for stamping, forming, and moderate drawing operations.  This material can be bent flat upon itself without cracking.  Good base for phosphate conversion coating.  Pretreatment recommendations are Clean, Phosphate, rinse, and seal or deionize rinse. HOT ROLLED STEEL: A low carbon steel suitableRead More …

TGIC-free powder coatings provide cost-saving benefits

TGIC-free powder coatings

TGIC-free powder coating options are available and are being used by manufacturers worldwide to achieve the same durable finish benefits as TGIC powder coatings. In fact, there are several advantages to the newer technology. It offers not just exterior durability, but enhanced mechanical performance, as well as flow and leveling properties. TGIC-free powder coatings provide cost-saving benefits to finishers by offering superior first-pass transfer efficiencies. Companies that have converted to TGIC-free based coatings have documented first-pass transfer efficiency improvements of asRead More …

Pearlescent powder coating,Tips before construction

Pearlescent powder coating

Tips before construction of pearlescent powder coating The pearlescent pigment having a colorless transparent, high refractive index, the directional foil layer structure, in the light irradiation, after repeated refraction, reflection and showing a sparkling pearl luster pigment. Not any permutation of the pigment platelets can produce crystal sparkle effect, in order to form a pearl and color, a prerequisite is the state of the lamellae pearlescent pigments are parallel to each other and arranged in rows along the surface ofRead More …

The advantages of fluorocarbon powder coating

fluorocarbon powder coating.webp

Fluorocarbon powder coating is a poly-vinylidene fluoride resin nCH2CF2 baking (CH2CF2) n (PVDF) as the base material or with metallic aluminum powder coating made for the toner. Bond of fluorine / carbonized the fluorocarbon base material in the chemical structure in conjunction with such a structure of the nature of having a short key is combined with hydrogen ions most stable solid combination, on the stability and solidity of the chemical structure different physical properties of the fluorocarbon paint inRead More …

Eddy current generation in a metallic conductor

Bonded metallic powder coating

A.1 General Eddy current instruments work on the principle that a high frequency electromagnetic field generated by the probe system of the instrument will produce eddy currents in an electrical conductor on which the probe is placed. These currents result in a change of the amplitude and/or the phase of the probe coil impedance, which can be used as a measure of the thickness of the coating on the conductor (see Example 1) or of the conductor itself (see ExampleRead More …

The important element for recoating powder coating

recoating powder coating

The most important element for recoating powder coating and as a matter of fact, for applying a different topcoating over an applied coating is to be sure the new coating will not lift or wrinkle the old coating. Check the old applied coating with a strong lacquer thinner by wetting the surface and giving it a couple of rubs with a damp cloth. If there is no excessive softening the coating should be OK to recoat with a new liquidRead More …

What Is The Film Hardness

film hardness

The hardness of the powder paint film refers to the resistance of the paint film after drying has a solid, i.e. the film surface the role another on the greater hardness of the material performance. This resistance exhibited by the film can be provided by a certain weight of the load acts on the relatively small contact area, by measuring the ability of the film antideformation manifested, so the film hardness is a view showing one of the important propertiesRead More …

Procedure of Measurement of coating thickness- ISO 2360

coating thickness- ISO 2360

Procedure of Measurement of coating thickness- ISO 2360 6 Procedure of Measurement of coating thickness 6.1 Calibration of instruments 6.1.1 General Before use, each instrument shall be calibrated in accordance with the manufacturer’s instructions, using suitable calibration standards. Particular attention shall be paid to the description given in Clause 3 and to the factors described in Clause 5. In order to minimize conductivity changes due to temperature variations, at the time of calibration the instrument and the calibration standards shallRead More …