Sodium carboxymethyl cellulose price
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Product Introduction
Product Details
Carboxymethyl cellulose (CMC) is an anionic cellulose ether, produced by reacting cellulose with chloroacetic acid under alkaline conditions.
Carboxymethyl cellulose powder is the sodium salt form of CMC. The key differences between the two are as follows:
1. Solubility: CMC-Na is readily soluble in cold water, forming a transparent, viscous solution; ordinary CMC requires alkaline conditions (pH>8) or heating to dissolve, limiting its ease of application.
2. Ionic Properties: Due to the presence of sodium ions, CMC-Na exhibits better salt resistance and greater viscosity stability in high electrolyte environments; ordinary sodium carboxymethyl cellulose thickener is easily affected by metal ions and precipitates.
3. Application Areas: CMC-Na is widely used as a food thickener, drug sustained-release agent, and toothpaste binder; ordinary CMC is mostly used in the textile and paper industries and requires alkaline conditions for use.
4. Stability: CMC solutions do not easily separate during long-term storage, while ordinary CMC may experience performance degradation due to pH changes. Chemically, both contain carboxymethyl groups (-CH2COOH), but the carboxyl group in CMC-Na exists in the form of a sodium salt (-CH2COONa), enhancing its hydrophilicity and functionality. Therefore, CMC-Na is the mainstream commercial product, while ordinary CMC is mostly used as an intermediate or for special industrial applications.
| Application | Type | Viscosity | Degree of Substitution | Purity | Moisture | |
| Food Grade | FH6 | 1% Soln 100-1000 | 0.7-0.9 | ≥99.5 | ≤8% | |
| FVH6 | 1% Soln 1000-10000 | 0.7-0.9 | ≥99.5 | ≤8% | ||
| FH9 | 1% Soln 300-500 | ≥0.90 | ≥99.5 | ≤8% | ||
| FVH9 | 1% Soln 1000-6000 | ≥0.90 | ≥99.5 | ≤8% | ||
| FL100 | 2% Soln 30-150 | ≥1.0 | ≥99.5 | ≤8% | ||
| Medical Grade | PM7 | 2% Soln 950-5400 | 0.65-0.98 | ≥99.5 | ≤8% | |
| PH7 | 2% Soln 6800-16200 | 0.65-0.98 | ≥99.5 | ≤8% | ||
| Toothpaste Grade | TH9 | 2% Soln 900-1200 | 0.92-1.0 | ≥99.5 | ≤7% | |
| TH10 | 2% Soln 900-1200 | 0.95-1.0 | ≥99.5 | ≤7% | ||
| TH12 | 2% Soln 900-1200 | ≥1.1 | ≥99.5 | ≤7% | ||
| 9H | 1% Soln 1200-4000 | 0.8-1.1 | ≥99.5 | ≤7% | ||
| Printing & Dyeing Grade | 10H | 1% Soln ≥3000 | ≥1.0 | ≥95.0 | ≤10% | |
| 13H | 1% Soln ≥2000 | ≥1.0 | ≥95.0 | ≤10% | ||
| 15H | 1% Soln ≥1800 | ≥1.50 | ≥95.0 | ≤10% | ||
| 18H | 1% Soln ≥1000 | ≥1.80 | ≥95.0 | ≤10% | ||
| Battery Grade | BVH | 1% Soln 1000-9000 | 0.89-0.94 | ≥99.5 | 5%-7% | |
| Ceramic Grade | C1300/1500/1800 | 1% Soln 1200-2000 | ≥0.90 | ≥98.0 | ≤10% | |
| C25 | 1% Soln 20-30 | ≥1.00 | ≥98.0 | ≤10% | ||
| CH10 | 1% Soln 100-1200 | ≥1.00 | ≥98.0 | ≤10% | ||
| TCH9 | 1% Soln 200-500 | ≥1.00 | ≥98.0 | ≤10% | ||
| Oil Drilling Grade | PAC-HV | 1% Soln ≥2500 | ≥0.95 | ≥98.0 | ≤10% | |
| PAC-LV | 2% Soln 100-150 | ≥1.0 | ≥98.0 | ≤10% | ||
| CMC-HV | 1% Soln 1500-1800 | ≥0.90 | ≥65.0 | ≤10% | ||
| CMC-LV | 2% Soln 90-150 | ≥0.90 | ≥65.0 | ≤10% | ||
| Papermaking Grade | FR | 2% Soln 10-70 | ≥0.90 | ≥99.0 | ≤10% | |
Sodium carboxymethyl cellulose (CMC-Na) exhibits a certain degree of salt resistance, but its performance varies under different salt conditions and concentrations.
Generally, CMC-Na maintains its performance and stability well in low-salt environments. In the presence of common salts such as sodium chloride, it can maintain the viscosity and other properties of the solution within a certain concentration range. This is because the carboxymethyl groups in the sodium CMC molecule interact with sodium ions, allowing the molecules to disperse and extend well in solution, thus performing its thickening and water-retaining functions.
However, when the salt concentration is too high, excessive sodium ions compete with the carboxymethyl groups on the sodium CMC molecule for water molecules, leading to enhanced intermolecular interactions. This can decrease the viscosity of the solution, affecting its salt resistance. For example, in extremely high salt concentration environments such as saturated sodium chloride solutions, the performance of high-quality sodium carboxymethyl cellulose may significantly decrease, its thickening effect weakens, and precipitation may even occur.
Sodium CMC from different sources or prepared using different processes may also exhibit differences in salt resistance. Some specially modified or treated CMC-Na may exhibit better salt resistance, maintaining stable performance over a wider range of salt concentrations.
In summary, sodium carboxymethyl cellulose (CMC-Na) possesses a certain degree of salt resistance, but in specific applications, it is necessary to select and use it appropriately based on actual salt concentrations and other conditions to ensure its effectiveness.
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