Category: Industry Tech
Industry technology of powder coating,coatings,elecstrostatic painting,etc.
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 …
The Principle of Hydrophobic/Super Hydrophobic Coatings
Conventional sol-gel coatings were prepared using MTMOS and TEOS as silane precursors to form a smooth, clear and dense organic/inorganic network on an aluminum alloy substrate. Such coatings are known to have excellent adhesion due to their ability to form Al-O-Si linkages at the coating/substrate interface.Sample-II in this study represents such a conventional sol-gel coating. In order to reduce surface energy, and hence increase hydrophobicity, we incorporated an organo-silane containing a fluorooctyl chain, in addition to MTMOS and TEOS (sampleRead More …
What is the steps of steel coil coating process
These are the basic steps of the steel coil coating process UNCOILER After visual inspection,moves the coil to the uncoiler whereby the steel is placed on a pay-off arbor for unwinding. JOINING The beginning of the next coil mechanically join to the end of the previous coil,this allows for the continuous feed of the coil coating line. This makes each edge of the joint area become the “tongue” or “tail” of the finished coated steel coil. ENTRY TOWER The entryRead More …
Formulation and production of high solids polyester amino acrylic paint
Formulation and production of high solids polyester amino acrylic paint High solids polyester amino acrylic paint is used primarily as an topcoat on passenger cars,motorcycles and other vehicles with better protection.It has the following features: Various application methods are available for High solids polyester amino acrylic paint,such as electrostatic spraying,air spraying,brushing . Drying conditions: baking at 140 ℃ with 30min Thick coating: During the application process,under the same conditions,one coating thickness is 1/3 more than ordinary high-solids paint, which canRead More …
Hot Press Transfer VS Sublimation Transfer
Classification of thermal transfer From the point of ink type,there are hot press transfer printing and sublimation transfer ; from the point of transferred object there are fabric, plastic (plates , sheets, film ) , ceramic and metal coating plates , etc. ; from the printing process,there can be divided into categories classification from the substrate thermal transfer paper and plastic film ; screen printing , lithographic , gravure, letterpress , inkjet and ribbon printing. The following highlights the hotRead More …
Powder Coating Hazard
What are the powder coating hazard? Most powder coating resins are less toxic and hazard, and the curing agent is significantly more toxic than the resin. However, when formulated into a powder coating, the toxicity of the curing agent becomes very small or almost non-toxic. Animal experiments have shown that there is no death and injury symptoms after inhalation of the powder coating, but there are different degrees of irritation to the eyes and skin. Although general powder coatings haveRead More …
Optimization of ultra-thin powder coating technology
Ultra-thin powder coating technology is not only an important development direction of powder coatings, but also one of the problems the world is still plagued in painting circles. Powder coatings hardly accomplish ultra-thin coating,that not only greatly limit its application scope ,but also lead to thicker coating (generally 70um above ) . It is an unnecessary waste costs for most applications which do not require thick coating . To solve this worldwide problem to achieve ultra-thin coating ,the experts haveRead More …
Advantages of Epoxy Polyester Hybrids Powder Coating
Advantages of Epoxy Polyester Hybrids Powder Coating Epoxy powder coatings based on newer technology are known as epoxy-polyester “hybrids” or “multipolymer” systems. This group of powder coatings could be considered simply part of the epoxy family, except that the high percentage of polyester utilized (often more than half the resin) makes that classification misleading. The properties of these hybrid coatings are more closely akin to epoxies than polyesters, with a few notable exceptions. They show similar flexibility in terms ofRead More …
Anti-corrosion epoxy powder coating play a protective function
The joint application of cathodic protection and corrosion protection layer, allows underground or underwater metal structure to obtain the most economical and effective protection. Usually coated with a protective coating before use, to the metal and dielectric environment electrical insulation isolation, a good coating can protect more than 99% of the structures of the outer surface from corrosion. The pipe coating in the production, transportation and construction, can not absolutely guarantee against any damage to (fill the mouth coating, theRead More …
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 …
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 …
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 …
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
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 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 …
7 Standards To Test Weathering Resistance of Powder Coatings
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 …
Two strategies for designing coatings with exceptional mar resistance
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
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 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 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 …
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 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 …
The advantages of fluorocarbon powder coating
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
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
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
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 …