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PVDF fluorocarbon coating

The fluorocarbon coating developed by the company is a new type of thermosetting coating for precoated coil based on DuPont's polytetrafluoroethylene as the main film forming material, it in the coating of weather resistance, hardness, stain resistance, resistance   It is far more than other film forming materials in acid and base, and is the king of modern outdoor building decoration materials. The excellent performance of PVDF fluorocarbon coatings is due to the special chemical structure of the product, due to the carbon-fluorine bond   In addition, only a small proportion of UV photons (≤220nm UV wavelength) in sunlight can destroy C-F bond. Sunlight has almost no effect on fluoropolymers, so fluoropolymers have ultra-high weather resistance.

Coating performance test index

Test item

Inspection specificationremarks

Coating appearance

Coating surface should be flat, no bubbles, shrinkage and other undesirable phenomena

Eye   measuring

fineness

Brightness: 10μm matte 20-25μm

Fineness plate

viscosity

110-130" 25 ℃ /

FD4# Viscosity Cup

Wet film specific gravity

White: 1.2-1.4 Others: 0.9-1.3

100ml specific gravity cup

Solid composition

White: 60±5% Silver: 50±3% Others: 53±3%

105℃×3Hr

luster

Bright light: Matte above 80℃ can be according to the actual requirements of customers

< 60 °

adhesion

1mm×1mm×100/100

Hundred grid method

hardness

≥HB

Mitsubishi pencil

impact

No cracks in 1/2×1000g×50cm

Impact meter

bend

Finish paint ≤2T

Bending meter

Solvent resistance

≥100 times (1kg force)

MEK

Acid and alkali resistance

48HR no abnormal phenomena such as discoloration, foaming and paint removal

5%HCL5%NAOH

Boiling water resistance

99±1℃2Hr no bubbles, paint and other abnormal phenomena

Thermostatic water bath

Salt spray resistance

35℃5%NACL×4000Hr no abnormal phenomenon such as foaming, paint removal

Salt spray tester

Weather resistance

4000HR does not bubble, flake and crack

Weather testing machine

self-cleaning



Graffiti resistance

Oil-based strokes wipe on the film without a trace



Coating process of PVDF fluorocarbon coating

Materials: pretreated substrate  

Diluent: supporting special diluent  

Coating viscosity: 60-90" /25℃ 

Film thickness: 28±2 μM m 

Drying conditions (PMT):224℃-241℃×60-90 ";

Two coatings and two baking processes are commonly used

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"Two coating and one baking" spraying process

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