March 2015 Archives

#204 Non-viscous Paints

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The term "non-viscosity" refers to anti-stick properties. As we are familiar with Teflon (by Du Pont) coating, which is used for the inner surface of a frying pan or the bottom of an iron, its performance is well known. Teflon coating prevents cooking ingredients or fabrics from getting attached to a frying pan or the bottom of an iron so that we can work with them more efficiently.

A typical non-viscous paint is the fluorine resin paint made with tetrafluoroethylene (PTFE). This can also prevent posters from sticking to surfaces.
Fluorine resin paints with non-viscous properties include tetrafluoroethylene (PTFE) resin paint, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin paint, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) resin paint, modified resin paint, tetrafluoroethylene-ethylene copolymer (ETFE) resin paint, and others.
Among these, PTFE and FEP paints are dispersion paints where resins are dispersed in solvents, while PFA and ETFE paints are provided in powder form. With any paints, coating is made by heating fluorine resin to above melting point until they fuse and form a film. In addition, modified fluorine resin paint, organosol paint, and solvent-based paints are also available.

As described above, most non-viscous paints are made up of fluorine resin. In addition to non-viscous properties, fluorine resin paints excel in sliding performance, chemical resistance and electrical insulation. They are used in a wide range of applications owing to these characteristics. Examples of their application are shown in [Table 1].

[Table 1] Application of non-viscous paints
Household use Various types of pots, frying pans, irons, crepe makers, table-top deep fryers, electric griddles, etc.
Industrial use Bread-making/confectionery blenders, rolls, cutters, baking pans, automated packaging machines, automated weighing machines, rubber/plastic molds, racks for painting/plating, fiber/paper-making rolls, etc.

Dispersion paints are made by dispersing fine particles of fluorine resin ranging from 0.1 to 0.4 µm into emulsifier-containing water or organic solvents and compounding them with pigments or fillers on an as-needed basis. Powder paints are made by painting pure fluorine resin powders ranging from 5 to 50 µm and are capable of providing the full advantages of fluorine resin.

Modified fluorine resin paints are made by dispersing fluorine resin powders into another type of resin paint which act as a binder. They leave particulate fluorine resin even after the coating have been formed. Resins such as epoxy, phenol, urethane, acrylic, and silicone are used as a binder. This type of paint has lower non-viscosity properties; however, the adhesiveness with materials is improved, allowing baking at a relatively lower temperature.

Organosol paints are made by dispersing vinylidene fluorine resin powders into soluble modified resin paints. During the heating and baking process, fluorine resin powders are dissolved into solvents in the coating film. Because of the baking temperature being relatively low, they are used with curtain walls and pre-coated metals.

Solvent-based paints are made by producing degenerative changes in fluorine resin to be soluble in organic solvents. They can be handled in the same manner as regular paints.

#203 Lubricating Paints

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Lubricating paints are used in areas where it is difficult to lubricate with oil/grease commonly used, in areas that are not compatible with greasing by such agents, and in rolling bearings used under a special atmosphere such as in a vacuum. They are also used to reduce friction between sliding objects and/or to improve resistance to abrasion and corrosion. With the developments in the sectors of precision industry and semiconductor manufacturing in recent years, dust- and maintenance-free features are required, and thus the self-lubricating properties achieved by these lubricant is increasingly demanded.
Types of lubricating paints include molybdenum disulfide lubricating paints, tetrafluoroethylene lubricating paints, graphite lubricating paints, and boron nitride/tungsten disulfide lubricating paints.

(1) Molybdenum disulfide lubricating paints

This type of paint is used for the following:

1. Friction area of a machine where micro-vibrations are likely to occur
2. Plastic forming such as wire drawings/cold extrusion of stainless steel, titanium, aluminum, etc.
3. Lubrication of rolling bearings, sliding bearings, and screws used in a special atmosphere such as in a vacuum or under high/low temperature environments
4. Antirust and lubrication of springs used for railroad vehicles and automobiles
5. Lubrication of cameras, office machines and other machines

and other purposes.

(2) Tetrafluoroethylene resin lubricating paints

This type of paint is used for a wide range of applications from bridges, dams, and floodgates operated under low-speed / high-load conditions to kitchen instruments such as frying pans.

For example, it is used for the following:

1. Fulcrum of bridges and bearings of floodgates that are used under high-load / low-speed conditions
2. Bearing alloys and glass foundation cloth, etc. (used as lubricants by impregnating them with this paint)
3. Improving sliding performance of clocks, sewing machines, and irons, etc.
4. Adding non-viscous properties to the instruments for food, fibers, paper manufacturing, and kitchen
5. Lubrication of general machinery

and other purposes.

(3) Graphite lubricating paints

This type of paints is used in an atmosphere where it is not possible to use molybdenum disulfide or tetrafluoroethylene resin.

For example, it is used for the following:

1. Lubrication of sliding components used in a high-temperature atmosphere such as boiler's heat exchanger or casting equipment, as well as ones used in an environment where there is the effects of radiation such as a nuclear reactor
2. Lubrication during hot working processes of metals such as casting, drawing, or extrusion, as well as mold releasing during hot working processes of glass

and other purposes.

(4) Boron nitride/tungsten disulfide lubricating paints

This type of paint has the following uses:

1. High-temperature mold release agent
2. Lubricants for breaking in a machinery

and other uses.

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