Paint kit for heavy duty coating
A heavy-duty anti-corrosion and coating technology, applied in anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve problems such as not showing satisfactory physical properties, and achieve the effect of excellent physical properties
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Embodiment 1
[0071] 1) Primer paint
[0072] 6 parts by weight of silane-modified epoxy resin (Kukdo Chemical Co., Ltd., KSR176X90), 7 parts by weight of the first solvent (xylene+Kocosol+isopropanol), 78.9 parts by weight of zinc powder and 0.1 parts by weight of Parts of dispersant (BYK, DISPERBYK-110) were added to the container and dispersed using a high speed dissolver until the pigment particle size (measured according to ASTM D1210) reached 50 μm. After the dispersion was completed, 2 parts by weight of the first solvent (methoxypropanol) was further added to prepare a primer main material part.
[0073] Next, 2 parts by weight of a curing agent (KCC Corporation, a mixture of Mannich reaction product and epoxy-amine reaction product), 3.7 parts by weight of the first solvent (isopropyl alcohol + Kocosol + xylene), and 0.3 parts by weight of a curing accelerator are added agent (Huntsman Corporation, ACCELERATOR 2950CH) to prepare the basecoat curing agent part.
[0074] Thereafter...
experiment example 1
[0092] A primer layer having a film thickness of 60 μm was formed by applying each of the primer paints prepared in Examples and Comparative Examples, respectively, under conditions of an ambient temperature of −18° C. to 49° C. and a relative humidity of 85% or less. Then, a middle coating layer having a film thickness of 210 μm was formed by applying the middle coating paint on the base coat under the conditions of an ambient temperature of −5° C. to 40° C. and a relative humidity of 85% or less.
[0093] Subsequently, the coating film in which the undercoat layer and the intermediate coat layer were formed was aged under the following conditions (ISO 20340).
[0094] 1 cycle: -20℃(24 hours)+QUV-A(72 hours)+Q-FOG(72 hours)
[0095] 25 cycles: 4,200 hours
[0096] Thereafter, the physical properties of the coating films were evaluated by the following methods, and the results are shown in Table 4.
[0097] *Corrosion resistance (rust creep): evaluated according to ISO 20340...
experiment example 2
[0105] By applying the topcoats prepared in the Examples and Comparative Examples, respectively, on the middle coat formed in Experimental Example 1 under the conditions of an ambient temperature of -5°C to 40°C and a relative humidity of 85% or less, Thus, a topcoat layer having a film thickness of 50 μm was formed.
[0106] Then, the coating film formed with the undercoat layer, the middle coat layer, and the top coat layer was aged under the following conditions.
[0107] - Ultraviolet (UV) irradiation with QUV-A lamp for 2,000 hours.
[0108] - Condensation cycle: 60°C, UV 8 hours 40°C, dark condensation 4 hours.
[0109] Thereafter, the physical properties of the topcoat layer were evaluated by the following methods, and the results are shown in Table 5.
[0110] *Color difference (ΔE): Evaluation was performed according to ASTM D2244.
[0111] - Use a color computer to measure the color difference before and after the test
[0112] *Gloss retention (%): evaluated ac...
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