Na CMC
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Product Introduction
Product Details
What is Sodium Carboxymethyl Cellulose?
Sodium CMC is the most widely used and consumed type of cellulose in the world today.
Abbreviated as CMC-Na, it is a cellulose derivative with a degree of polymerization of glucose of 100-2000 and a relative molecular mass of 242.16. It is a white fibrous or granular powder. Odorless, tasteless, hygroscopic, and insoluble in organic solvents.
| 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% | |
Main Uses
In the food industry, it is used as a thickener; in the pharmaceutical industry, as a drug carrier; in the daily chemical industry, as a binder and anti-re-settling agent; in the printing and dyeing industry, as a sizing agent and protective colloid for printing pastes; and in the petrochemical industry, it can be used as a component of oil fracturing fluid.
Basic Properties
This product is the sodium salt of carboxymethyl cellulose ether, an anionic cellulose ether. It is a white or off-white fibrous powder or granules with a density of 0.5-0.7 g/cm³. It is almost odorless and tasteless, and hygroscopic.
CMC Sodium is easily dispersed in water to form a transparent gel-like solution. It is insoluble in organic solvents such as ethanol. A 1% aqueous solution has a pH of 6.5–8.5. When pH > 10 or < 5, the viscosity of the gel decreases significantly. Its performance is optimal at pH 7.
Carboxymethylcellulose is heat-stable. Its viscosity increases rapidly below 20°C, changes more slowly at 45°C, and prolonged heating above 80°C can denature the colloid, resulting in a significant decrease in viscosity and properties.
It is readily soluble in water, forming a transparent solution. It is very stable in alkaline solutions, but easily hydrolyzes in acids. Precipitation occurs at pH 2-3, and it also reacts with polyvalent metal salts to form precipitation.
Instructions for Use
Mix CMC-Na directly with water to prepare a paste-like solution. When preparing the CMC paste, first add a certain amount of clean water to a mixing tank equipped with a stirrer. With the stirrer on, slowly and evenly sprinkle the CMC into the mixing tank, stirring continuously to ensure the Sodium CMC and water are completely mixed and the CMC is fully dissolved.
The reason for evenly sprinkling and continuously stirring when dissolving CMC is to prevent clumping and agglomeration of the Sodium CMC when it comes into contact with water, thus reducing the solubility of Carboxymethyl cellulose sodium, and to increase the dissolution rate of CMC.
The stirring time and the time required for the Carboxymethyl cellulose powder to completely dissolve are not the same; they are two separate concepts. Generally, the stirring time is much shorter than the time required for the Sodium Carboxymethyl cellulose thickener to completely dissolve. The specific times required depend on the individual circumstances.
The basis for determining the stirring time is:
When sodium carboxymethyl cellulose is evenly dispersed in water without any obvious large clumps, stirring can be stopped, allowing the CMC and water to permeate and blend together in a static state.
The time required for complete dissolution of CMC is determined based on the following factors:
Sodium carboxymethyl cellulose powder and water are completely bonded together without any solid-liquid separation; the mixed paste is homogeneous with a smooth surface; the mixed paste is nearly colorless and transparent, and contains no particulate matter. From the time CMC is added to the mixing tank and mixed with water until it is completely dissolved, the time required is between 10 and 20 hours.
Quality
The main indicators for evaluating the quality of CMC powder are the degree of substitution (DS) and purity. Generally, different DS values result in different properties of CMC; a higher degree of substitution enhances solubility, and the solution exhibits better transparency and stability. It has been reported that Sodium carboxymethyl cellulose food thickener exhibits better transparency when the degree of substitution is between 0.7 and 1.2, and its aqueous solution viscosity is highest at pH values between 6 and 9. To ensure its quality, in addition to selecting the etherifying agent, several factors affecting the degree of substitution and purity must be considered, such as the ratio of alkali to etherifying agent, etherification time, system water content, temperature, pH value, solution concentration, and salt content.
Precautions
CMC Natrium is contraindicated when combined with strong acids, strong bases, or heavy metal ions (such as aluminum, zinc, mercury, silver, iron, etc.).
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