Water Based Sealing Lacquer, Brand Name : JADECHEM (J&C)

We are offering jc-2050 water-based sealing lacquer/anti-tarnish.
About
jc-2050 lacquer is used in the post-treatment for deposits with transparent or black passivation films such as zn-ni alloy plating, ni-cr plating, gold imitation plating and zn passivation. Jc-2050 is a water-based solution, when immersing or spraying, the transparent organic protective film can enhance the corrosion resistance. For zinc deposit, it can increase the salt spray test by at least 50 hours.
Make up of working solution
the solid content of jc-2050 is 50% , a working solution is usually diluted by adding 4-8 unit’s (weight ratio) deionized water (the solid content will be 5%--10%). If the solution is cloudy, please fill in ammonia water to adjust the ph value in the range of 7.5-9.5 and make the solution clear.
Working condition
immersing time 10—30 secs.
Immersing temperature 10—30℃
trickling time 1—3 mins
drying temperature 120℃
drying time 10—20 mins.
Maintenance of working solution
the consumption of solution is in proportion to the drag out. The solid content of jc-2050 in the working solution should be tested after a certain period, fill in the required jc-2050 basic solution to adjust.
Measuring of solid content: sample 4—5g, drying way: 120℃×30mins.
The drag in of acid shall be avoided as the acid could cause the cloudy of solution. Once it happens, please adjust by filling in ammonia water to regulate the ph value.
Notes
during the working process, the variation of solid content shall be monitored, if a “rainbow” appears on the lower part of work piece after immersing, it means the solid content is too high, then the required deionized water shall be added to dilute; if a “rainbow” appears on the upper part of work piece after immersing, it means the solid content is too low, add in required jc-2050 basic solution and re-immerse the work piece.
Packing and storage
packed in pe plastic drum and 25kg/drum
stored in cool and dry place.
drying---baking---cooling---parts
4. Initial make up of solution:
4.1 initial make up of transparent lacquer
ratio:
original electrophoretic lacquer: deionized water=1:5
method:
due to the high viscosity of jc-2011, please stir when adding original lacquer to avoid precipitation.
4.2 initial make up of color lacquer
ratio:
original electrophoretic lacquer: deionized water=1:5
if the color paste is water-soluble, just add the color paste in the ready made lacquer solution and electrophoresis after fully circulation.
if the color paste is oil-soluble, firstly please add the color paste into the original lacquer, mechanical stir till uniform but make sure to keep the lacquer cool, and then fill in water, stir uniform to get the solution.
note: suitable stir-to-cured time of solution is important, otherwise, pitting and holes on the coating film may occur due to the effect of low boiling point solvents; while it can’t be too long, or the lack of solvent will lead to bad leveling and replenishment of solvent is required.
5. Properties of jc-2011 electrophoretic lacquer
appearance yellowish to milky white transparent liquid
solid content (%) 28±2
6. Operation technological parameter
solid content (%) 10±2
ph (25℃) 5.5±0.5
conductivity (μs/cm @ 25℃) 400-800
temperature (℃) 20-30
voltage (v) 30-80
time of electrophoresis (sec) 15-60
curing condition (℃/min) 120-160/30
7. Technological index of coating film
property performance test method
appearance clear --
film thickness 5-15 μm film thickness tester
adhesion 0 grade gb9286-88
hardness 4h gb6739-89
solvent resistance no abnormal rubbed by acetone 400 times
boiling water resistance no abnormal 2 hours
perspiration resistance 36 hours passivation of surface
8. Maintenance
similar maintenance as regular electrophoretic lacquers, control the temperature of tank solution and regular ultrafiltration is required to remove impure ions.
when comes to the regular problems such as pitting, non uniform leveling on coating film, adjusting by adding solvent is suggested, small volume in a single time but frequently.
9. Storage and packing
stored in cool and dry place, estimated shelf life is 12 months.
packed in plastic drum, 25kg/drum.