To identify the Hansen solubility parameters of grey, grey pro, high temp, elastic, and tough resins.
Date Run:
11/25/2019
Experiment Procedure:
Twenty-four standardized solvents for HSPiP testing were placed into individual 22ml vials per resin. The resin was poured into a ¼ teaspoon, 1.25ml, and added to a vial; this process was repeated for each of the 24 solvents. Visual observations and ratings were taken after 15 minutes of unheated immersion. The following rating key was based on how the resin dissolved in the solvents.
The two hardest resins to dissolve were the High Temp. Resin and the Grey Pro resin within the 10-minute cleaning time. There was no change in ratings even after a full 20 minutes of immersion. Isopropanol (#14) was not effective at dissolving the Tough and Grey Pro resin. Most of the resins settled on the bottom of the vial and agitation after rating did improve solubility with some of the solvents.
HSPiP Program Sphere Results:
A core value for D, P, and or H value of 0.25 or less is considered good, and 0.75 or higher is considered a bad.
Resin
D Value
P Value
H Value
Core Values
Grey
16.49
0.84
10.97
±[0.30, 0.65, 0.90]
Tough
18.72
10.35
15.49
±[0.35, 1.95, 0.75]
High Temp.
18.61
15.76
14.87
±[1.45, 1.15, 1.15]
Elastic
20.83
11.82
13.87
±[0.20, 0.65, 0.45]
Grey Pro.
16.51
16.67
12.86
±[0.25, 0.15, 0.30]
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
Additional solvents will be needed for testing to create a better sphere of solubility for each resin. It would also be helpful going forward to get coupons made of the resins so we can test cured and uncured a the same time. Once the spheres are considered “good”, the D, P, and H values will be plugged into the software to create a junction value of all of the resins. This junction value will be used to identify the safer solvent options.
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