What role does CMC glue play in heat-sensitive materials

2022-10-27 Hits: 65 views

The full name of CMC is called carboxymethyl cellulose, which is obtained by carboxymethylation of cellulose. Its aqueous solution is what we often call CMC glue, which has the functions of thickening, film-forming, bonding, moisture retention, and colloid protection. It is widely used in petroleum, food, medicine, textile and papermaking industries, and is one of the very important cellulose ethers.

1. The role of CMC glue in heat-sensitive materials
CMC can be used as paper surface smoothing agent and sizing agent in heat-sensitive materials. Adding 0.1% to 0.3% CMC to the pulp can enhance the tensile strength of thermal paper by 40% to 50%, and increase the compressive rupture by 50%. Kneading increased 4 to 5 times.

2. Other uses of carboxymethyl cellulose (CMC)
1. Drilling, drilling and other projects of petroleum and natural gas

① The mud containing CMC can make the well wall form a thin and firm filter cake with low permeability, which reduces the water loss.

② After CMC is added to the mud, the drilling rig can obtain a low initial shear force, so that the mud can easily release the gas wrapped in it, and at the same time, the debris is quickly discarded in the mud pit.

③Drilling mud, like other suspension dispersions, has a certain period of existence, and the addition of CMC can make it stable and prolong the period of existence.

④ The mud containing CMC is rarely affected by mold, so it is not necessary to maintain a high pH value and use preservatives.

⑤ Contain CMC as drilling mud washing fluid treatment agent, which can resist the pollution of various soluble salts.

⑥ The mud containing CMC has good stability and can reduce water loss even if the temperature is above 150℃.

2. Textile, printing and dyeing industry Textile industry
CMC is used as sizing agent for light yarn sizing of cotton, silk wool, chemical fiber, blended and other strong materials.

3. CMC can be used as a dirt adsorbent when added to synthetic detergents; daily chemicals such as toothpaste industry CMC glycerin aqueous solution is used as a gum base for toothpaste; pharmaceutical industry is used as a thickener and emulsifier; CMC aqueous solution is thickened and used for floating mineral processing, etc.

4. Ceramic industry
It can be used as an adhesive for blanks, a plasticizer, a suspending agent for glazes, and a color-fixing agent.

5. Construction industry
Improves water retention and strength.

6. Food industry
The food industry uses CMC with high substitution degree as thickener for ice cream, canned food, quick-cooked noodles, foam stabilizer for beer, etc. agent or excipient.

7. Pharmaceutical industry
CMC with appropriate viscosity is selected as the adhesive, disintegrant, and suspending agent of the tablet.

Three, carboxymethyl cellulose (CMC) dissolution method
(1) CMC and water are completely bonded, and there is no solid-liquid separation between the two;

(2) The mixed paste is in a uniform state, and the surface is smooth and smooth;

(3) The color of the mixed paste is close to colorless and transparent, and there are no granular objects in the paste. It takes 10 to 20 hours from when CMC is put into the batching tank and mixed with water until CMC is completely dissolved.

Fourth, carboxymethyl cellulose (CMC) storage precautions
1. When storing, pay attention to moisture-proof, fire-proof and high-temperature proof, and it is required to be stored in a ventilated and dry place.

2. It is strictly forbidden to contact with water during storage, otherwise it will gel or partially dissolve and it cannot be used.

Five, carboxymethyl cellulose (CMC) transportation precautions
Rainproof during transportation, and iron hooks are strictly prohibited for loading and unloading. Long-term storage and stacking pressure of this product may cause agglomeration when unpacking, which will cause inconvenience but will not affect the quality.