Because sodium carboxymethyl cellulose is easily soluble in water, the solution is transparent; and it has the characteristics of being stable in alkaline solution and easy to hydrolyze in case of acid. It is widely used in many industries, among which it is used in ice packs and cold storage agents. It is also used in production, so what are the characteristics of carboxymethylcellulose sodium (CMC-Na) in the production of ice packs and cold storage agents?
The main principle of products used to cool down, such as ice packs, refrigerants and cold storage agents, is to use the reaction between the proportioning ingredients to produce a process of absorbing heat, so as to achieve the effect of cooling.
The main ingredients for making ice packs are roughly: sodium nitrate, sodium borate, sodium carboxymethylcellulose (CMC-Na), sodium silicate, sodium chloride and sodium hydroxide.
The usual method of preparing ice packs is to mix the above formulations according to the application ratio:
1. Weigh sodium carboxymethylcellulose and add it to sodium borate, stir and heat, stop heating after the solution becomes transparent, and obtain solution 1;
2. Add sodium nitrate, sodium sulfate decahydrate and sodium silicate sequentially to solution 1 under stirring, and stir evenly to obtain solution 2;
3. Add sodium hydroxide to the solution, stir evenly, then add sodium chloride, stir evenly, after the solution is transparent, put it into a bag, and then make a finished ice bag.
Chemical ice packs have the advantages of low refrigeration temperature and long refrigeration time.
The so-called refrigerating agent is cold storage agent, which is mainly composed of antifreeze, thickener and water, among which antifreeze includes ethylene glycol, etc.; thickener includes sodium carboxymethyl cellulose and sodium alginate, etc.
The steps to prepare the coolant are simple:
1. First, completely dissolve thickeners such as carboxymethylcellulose sodium (CMC-Na) in water to form a gel solution with good transparency;
2. After the solution is stable, add antifreeze such as ethylene glycol while stirring, and after stirring evenly, the cooling agent can be obtained.
This type of cold storage agent can be widely used in ice packs, which improves the service life and provides better cooling effect.
To sum up, sodium carboxymethyl cellulose uses its own characteristics to play with the substances in the production of ice packs and cold storage agents to form its products. At the same time, it improves the service life and cooling effect of the cold storage agent.
