November 7, 2025
 EZHOU ANJEKA TECHNOLOGY CO.,Ltd professional Additive supplier |
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| Dispersant Test Sheet | |||||||
| Test Name | Screening of Dispersants for Aqueous Barium Sulfate Paste | ||||||
| Test Start Date | 2025.6.22 | Test End Date | |||||
| Objective: Evaluation of dispersants in a resin-free filler paste based on barium sulfate. | |||||||
| Pigment Paste Formula | |||||||
| Barium Sulfate (800 mesh) Paste Unit:Gram | |||||||
| Component | 6220 | 6210 | 6070 | 6272 | 6270A | 6072 | 6272A |
| Water | 58.8 | 58.8 | 58.8 | 58.8 | 58.8 | 58.8 | 58.8 |
| Dispersant | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 4420 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Filler | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
| Total | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Experimental Method | |||||||
| 1. After 2 hours of shaking, viscosity recorded. 2. Stability observed. |
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| Test Result | |||||||
| Resin-Free Paste Viscosity（mpa.s ） | |||||||
| 34℃ | 6220 | 6210 | 6070 | 6272 | 6270A | 6072 | 6272A |
| Barium Sulfate | 50 | 50 | 50 | 300 | 200 | 50 | 200 |
| In the resin-free barium sulfate paste, dispersants 6070, 6220, 6210, and 6072 demonstrated the most effective viscosity reduction. | |||||||
| Settling Status (50°C, 5 Hours) | |||||||
| 6220 | 6210 | 6070 | 6272 | 6270A | 6072 | 6272A | |
| Layering / Sedimentation | Layering with sediment | Layering with sediment | Layering with sediment | Layering without sediment | Layering without sediment | Layering with sediment | Layering without sediment |
| Minimal layering | |||||||
| Dispersant 6270A demonstrated superior layer stability. | |||||||
| Settling Status (50°C, 24 Hours) | |||||||
| 6220 | 6210 | 6070 | 6272 | 6270A | 6072 | 6272A | |
| Layering | 50% | 50% | 50% | 20% | 20% | 50% | 50% |
| Sedimentation | Pasty, soft sediment (irreversible) | Pasty, soft sediment (irreversible) | Pasty, soft sediment (irreversible) | Can be re-homogenized by shaking | Can be re-homogenized by shaking | Pasty, soft sediment (irreversible) | Pasty, soft sediment (irreversible) |
| Dispersants 6270A and 6272 showed good layer stability. | |||||||
| Conclusion | |||||||
| 1.In the resin-free barium sulfate paste, dispersants 6070, 6220, 6210, and 6072 demonstrated the best performance in viscosity reduction. 2.Regarding layer stability, dispersant 6270A showed the superior stability. |
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