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Magtyte
○Preface
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In view of the environmental conservation and product durability,
the conventional use of plastic raw materials has gradually been shifted
to that of magnesium alloy which is light in weight with enough strength
and yet allowing a recycling advantage in use, covering the industrial fields
from automobile parts, home electronic products, office automation products,
telecommunication devices, farm and forestry equipment parts, broadcasting
equipment parts, etc.
The magnesium alloy retains enough strength per weight, manifesting
a l/4 weight compared with that of iron and a 2/3 weight compared with aluminum.
The magnesium alloy is, however, generally known as one of the materials
very hard to coat. Even with the chromic acid treatment applied, it causes
important problems such as insufficient adhesive strength resulting from
a release agent, cutting oil, and unevenness of treatment involved therein,
and inadequate corrosion resistance incurred from impurities slightly contained
in the materials.
Magtyte is an epoch-making primer used exclusively for magnesium alloy, developed for providing a coating layer that is not only excellent in adhesive strength but also superior in corrosion resistance, using epoxy resin as its major component mixed with stable rust-preventive pigment.
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○Features
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1.
2.
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Retaining excellent adhesive strength to magnesium alloy.
Exhibiting strong rust preventive strength
Capable of applying any type of bake-finish upper coatings
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○Coating Specifications
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(1) |
Adjustment of Coating |
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Magtyte is a two-part type.
By fully mixing base coats for making a uniform mixture, add Magtyte
adjuster thereto, followed by dilution with use of dedicated thinner. (Since
other type of thinners may not dissolve, be sure to use the dedicated thinner.)
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(2) |
Coating Specification |
| Mixing ratio |
Thinner
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Dilution
Ratio(Wt%)
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Viscosity
Iwata Cup
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Coating
method
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Baking
Conditions
(Standard)
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Modifier
30-50% to
Base 100%
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Thinner
No. 1001-1003
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10-20
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12-16 sec
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Air spray
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130℃× 20 min
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(3) |
Evaporation Rate and Seasons for Suitable Use of Dedicated Thinner
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Thinner
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Evaporation rate
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Seasons for use
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No. 1001
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Slow
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Summer
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No. 1003
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∥
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Spring/Autumn
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No. 1002
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Quick
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Winter
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(4) |
Setting time
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4-1 For 2-coating / Baking: Setting time of more than 5 min (at 20℃)
4-2 For 2-coating / 2-Baking: Setting time of more than 3 min (at 20℃)
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(5) |
Baking conditions
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Standard 130℃ × 20 min
Application range 100℃ × 20 min - 180℃ × 20 min (for 2-coat/baking)
Note: For primer single baking: 150℃ × less than 20 min
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(6) |
Coating amount |
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For coating thickness of 20 μ : 100 - 120 gr/m2
Standard coating thickness: 15 - 25 μ
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(7) |
Coating film performance
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Raw material: Magnesium alloy AZ91D
Pre-treatment: Chromic acid treatment
Baking conditions: Magtyte 130℃ × 20 min Acryon 150℃ × 20 min
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Testing/tern
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Magtyte +Acryon
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Remarks
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Film thickness
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35-45 μ
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Measurement by Kett
Electromagnetic thickness gauge
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Adhesive strength
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100/100
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Peeling off of/mm
square 10 × 10 cellophane tape
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Pencil hardness
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2H
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Scratch hardness by
Mitsubishi Uni Pencil
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Erichsen(test)
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Acceptable up to
breaking of material
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Movement by extruding
Length in mm
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Impact resistance
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Acceptable up to
breaking of material
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Dupont type: R l/4" × kg × cm
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Resistance to water
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Normal
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Dipping for 240 hr at
40℃ in city water
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Resistance to
boiling water
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Normal
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Dipping for 3 hr in
Boiling water
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Resistance to Acids
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Normal
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Dipping for 168 hr at
20℃ H2SO4 (in 5%)
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Resistance to
alkalis
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Normal
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Dipping for 168 hr at
20℃ NaOH (in 5%)
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Resistance to
Humidity
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Normal
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500 hr in RH98-l00% at 50℃
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Resistance to salt spray
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Normal
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500 hr at 35℃ NaCl(in 5%)
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