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CMC Uses In Paints And Coatings Industry

Views: 67     Author: Site Editor     Publish Time: 2022-01-22      Origin: Site

Paint grade carboxymethyl cellulose sodium has good thickening, dispersity and stability, it can improve the viscosity and rheology of coatings, so it is widely used in various coatings, latex coatings, water-based exterior and interior coatings, casting coatings and so on.

Use of instant paint grade carboxymethyl cellulose:

The so-called instant solution means that CMC powder can be dispersed and dissolved quickly in aqueous solution at room temperature, which is different from the conventional type of slowly dissolved CMC (the conventional type of CMC needs at least 2-3 hours of high-speed stirring to be completely dissolved). The viscosity of the instant coating grade carboxymethyl cellulose CMC will not immediately reach its actual viscosity with the rapid dissolution of the powder, and will be in 10-15 minutes after the dissolution of the viscosity, the formation of the actual viscosity can achieve the colloid. In addition, the colloid stability of instant CMC is better than that of conventional CMC with the same specifications.

Instant soluble carboxymethyl cellulose CMC is widely used in all kinds of water-based coatings, such as white latex, latex paint, putty, relief paint, natural stone paint, etc.

Advantages of paint grade carboxymethyl cellulose:

A) Coating is not layered and can be preserved for a long time;

B) It can provide quick-dissolving special products for coating applications in special fields;

C) Effectively adjust the rheology of glaze slurry, facilitate glaze application, and make the glaze slurry in a stable dispersion state;

D) Effectively improve glaze strength and smoothness to prevent deglazing;

E) Ensure the printing process in the production of printing glaze, and the printed patterns are clear and beautiful;

F) There will be no blocking in the printing glaze printing process, CMC has good water solubility and almost no insoluble substances such as fiber impurities;

Paint grade CMC carboxymethyl cellulose dissolution method:

The paint grade carboxymethyl cellulose is mixed directly with water and prepared into a paste glue for later use. Level in the configuration coating carboxymethyl cellulose paste adhesive, first with mixing plant ingredients in cylinder to join a certain amount of clean water, in the open under the condition of stirring device, the coating level of carboxymethyl cellulose slowly and evenly to the ingredients in cylinder, stir constantly, make paint carboxymethyl cellulose and water level fusion, carboxymethyl cellulose can fully melted coating level. When melting paint grade carboxymethyl cellulose, the reason to evenly spread, and constantly stirring, the purpose is "to prevent paint grade carboxymethyl fiber and water meet, agglomeration, agglomeration, reduce the paint grade carboxymethyl cellulose solubility problem", and improve the dissolution rate of paint grade carboxymethyl cellulose. Stirring time and paint grade carboxymethyl cellulose complete dissolution time is not consistent, are two concepts, generally speaking, stirring time is much shorter than paint grade carboxymethyl cellulose complete dissolution time, the required time depends on the specific situation.

Determine the stirring time on the basis of: when carboxymethyl cellulose in the water evenly dispersed, there is no obvious large lump object, you can stop stirring, so that carboxymethyl cellulose and water in a static state of mutual penetration, mutual fusion.

Determine the carboxymethyl cellulose complete dissolution of the time required on the basis of the following aspects:

(1) paint grade CMC carboxymethyl cellulose and water are completely bonded, and there is no solid-liquid separation between them;

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

(3) The color of mixed aleurone is close to colorless and transparent, and there is no granular object in the aleurone. From the paint grade CMC carboxymethyl cellulose is put into the mixing tank with water, to the paint grade CMC carboxymethyl cellulose completely dissolved, the required time between 10 to 20 hours.