Electrolyte (FX4-ECN) Properties

The most regular treatment of the remaining gelatin that produced during the process of semiconductor sealing are boiling-off exfoliation or electrolytic exfoliation for surface treatment of iron or non-iron materials. The kind chemists contain lots of acid-alkali materials and surface-active agent. The first one can not exfoliate the remaining gelatin, on the other hand, make gelatin solidification and harder to exfoliate. It also produces huge red precipitation when the electrolysis is processing, and attaches on objects. Moreover, the base's metal will be caustic embrittlement, because of contacting with alkali materials, and effect product durability. The surface-active agent will product lots of bubbles during the electrolysis. Besides above problems, there still have the problem of gelatin corrosion with bleaching and ashing simultaneously, and prints disappear too. The durability of acid-alkali exfoliation is very short and less than one week, no mater adding more exfoliation; it does not effect as the same and has to change new materials.

For resolving above problems, we start to research and analyze related studies, and receive the patent rights of some ingredients from oversea, to use in semiconductor-sealing manufactures in Taiwan. That is, Electrolytic remaining gelatin exfoliation (FX4-ECN) can control the concentration by visible efficiently.

FX4-ECN adapts special design of concentrated indicated agent. This design is mixed with electrolytic exfoliation smartly, and added appropriate moderator to keep the balance of density. In the practical process, we found the effect will consume by processing, but by adding FX4-ECN liquid to existing FX4-ECN. We can see the color changing from indigo back to transparent and non-precipitation, which means, the liquid has been rehabilitation and good for using. The reason is the electrolytic agent has aged when the color of FX4-ECN changes from transparent to indigo and some precipitation. Therefore, there is no need for daily use and manage of FX4-ECN by control of laboratory workers, but by senior supervisors. It can reduce the working load of operators.

 

Unique Characters:

Outlook Transparent or light-yellow liquid
PH Value 12
Flash point non-ignite ability
Heavy metal none
Halide none
COD 800-1,200

 


 



 Maintenance

Level of electrolyte should below the base of heater, the full capacity of electrolytic cell
is300L, the using capacity approximate 64*64*(74-14) / 1,000 = 245L.
Add pure water for supply, because of decreasing by evaporation and run-out.
Check the concentration of electrolyte daily and add in primary liquid when it is under l evel.

 

Analysis

  Use a cone-bottle and leaving on electronic scale, and get approximate 3g liquid from
cell, then record the weight precisely.
  Add 100ml DI water.
  Add few drops of Phenol red indicator.
  Use 0.5N HCL titration, the end of titration is the liquid becomes to orange and record
  the consumption of HCL ml.
  Count the concentration of electrolyte (%) =0.5N HCL consumption of titr
  ation ml *f* 14.61/weight of sample
  The f is the titration compare of the master concentrated ratio of 0.5N HCL, if basing on
  the master usage of 0.5N
  HCL, thenf=1, what if usage is 1N HCL, then f=2.
  Note: 14.61 is constant, do not change.
   
   
   

Calculation

For example: get 2.95g from electrolyte cell as sample, after adding 100ml DI water, the
result of titration 0.5NHCL
The consumption is 5ml and total of electrolyte from electrolysis cell are 245L:
Count the using concentration (%) = 5*1*14.61/2.95 = 24.8%
Due to the using of master electrolyte is dilution by adding two-and-half times water then
the primary liquid (100% concentrated), thus,
The master concentration of electrolyte in using is 33.3%.
Primary liquid (100% concentrated) adding amount: total capacity of electrolyte
* (標準master value - analysis value)= 245L*(33.3-24.8)/100 = 20.825L
Based on the result, only add 20.825L primary electrolyte, then can make 245L, the in
using electrolyte of 24.8% concentrated liquid to the concentration rate to 33.3%.