Carboxy Methyl Cellulose ( CMC ) is synthesized by the alkali-catalyzed reaction of cellulose with chloroacetic acid. The polar (organic acid) carboxyl groups render the cellulose soluble and chemically reactive. The functional properties of Fooding Carboxy Methyl Cellulose(CMC) depend on the degree of substitution of the cellulose structure (i.e., how many of the hydroxyl groups have taken part in the substitution reaction), as well as the chain length of the cellulose backbone structure and the degree of clustering of the carboxymethyl substituents.
Oil Drilling Grade CMC
Physical and Chemical Indexes of Sodium Carboxymethyl Cellulose for Drilling Fluid.(Perform SY5093-92 Standard)
| LV-CMC | MV-CMC | HV-CMC |
| Appearance | White or light yellow powder, freely flowable |
| Replace degrees(D. S) | 0.80 min |
| Purity | 80% min | 85% min | 95% min |
Viscosity 2%
(in 2% solution at 25 centigrade) | 200-500 mpa.s | 600-900 mpa.s | 1000-1800 mpa.s |
| Size(60 head) | 80% |
| Moisture (%) | 10% max |
| PH | 7.0-9.0 | 7.0-9.0 | 6.5-8.0 |
Category |
Item | Index |
| Distilled water | Salt water | Saturated salt water |
| Oil-based mud | Filtration loss,ml | 60±10 | 90±10 | 100±10 |
| Apparent viscosity,mpa.s | ≤6 | ≤6 | ≤10 |
| PH | 8.0±1.0 | 8.0±1.0 | 7.5±1.0 |
| HV-CMC | Pulping rate,m³/t | ≥200 | ≥150 | ≥160 |
| LV-CMC | Filtration loss
(10ml) | Dosage,g/l | ≤7.0 | ≤10.0 |
| Apparent viscosity,mpa.s | ≤4.0 | ≤6.0 |
| MV-CMC | Dosage,g/l | 6.0 | 14.0 | 3.5 |
| Apparent viscosity,mpa.s | ≥15 | ≥15 | ≥15 |
| Filtration loss,ml | ≤9 | ≤9 | ≤8 |
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