Description
Drilling Starches
- Hydroxypropyl methyl cellulose (HPMC) salt resistance: because ion and the polyelectrolytein exsist in this product, its metal salt or organic electrolyte aqueous solution is stable.
- Surface activity: HPMC for daily chemical aqueous solution has the surface activity, ensuring its emulsification, protective colloid and relative stability.
- Low ash content: because ion exist in this product, in preparation process we can use hot water washing for effective refinement, so its ash content is very low.
- pH stability: HPMC aqueous solution viscosity in the range of pH3.0-11.0 is more stable.
- Water retention effect: this product is hydrophilic and its solution has high viscosity.
- Film-forming property: HPMC can generate strong pliable and transparent sheet, which has the good oil resistance to ester performance.
Specifications:
| Item | HPMC |
| Methoxyl content (-OCH3),w/% | 20.0 – 28.0 |
| Hydroxypropyl content (-OCH2CHOOHCH3),w/% | 5.0-11.0 |
| Gelling temperature, °C | 55-80 |
| Moisture content ,w/% | max 1% |
| Residue on ignition,w% | max 1.5% |
| Lead (Pb), ppm | max 2 |
| Arsenic (As) ,ppm | max 2 |
| Heavy metal | max 20 |
| Viscosity (mpa.s) | 5-200,000 |
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