Hydroxyethyl cellulose (HEC) is a white or light yellow, odorless, non-toxic fibrous or powdery solid prepared by etherification of alkaline cellulose and ethylene oxide (or chlorohydrin). Nonionic soluble cellulose ethers. Because HEC has good properties of thickening, suspending, dispersing, emulsifying, bonding, film-forming, protecting moisture and providing protective colloids, it has been widely used in oil exploration, coatings, construction, medicine and food, textiles, papermaking and polymers. Polymerization and other fields. Hydroxyethyl cellulose is unstable at normal temperature and pressure, avoiding humidity, heat, and high temperature, and has exceptionally good salt solubility for dielectrics. Its aqueous solution is allowed to contain high concentrations of salts and is stable.
Instructions
Join directly in production
1. Add clean water to a large bucket equipped with a high-shear blender.
2. Start stirring continuously at low speed and slowly sieve the hydroxyethyl cellulose into the solution evenly.
3. Continue stirring until all particles are soaked through.
4. Then add antifungal agents, alkaline additives such as pigments, dispersing aids, ammonia water.
5. Stir until all the hydroxyethyl cellulose is completely dissolved (the viscosity of the solution increases significantly) before adding other components in the formula, and grind until the finished product.
Equipped with mother liquor
This method is to first prepare a mother liquor with a higher concentration, and then add it to the latex paint. The advantage of this method is that it has greater flexibility and can be directly added to the finished paint, but it should be properly stored. The steps are similar to steps 1-4 in method 1, except that high stirring is not required to completely dissolve into a viscous solution.
Use caution
Since the surface-treated hydroxyethyl cellulose is powder or cellulose solid, it is easy to handle and dissolve in water as long as the following matters are noted.
1. Before and after adding hydroxyethyl cellulose, it must be continuously stirred until the solution is completely transparent and clear.
2. It must be sieved into the mixing barrel slowly. Do not directly add the hydroxyethyl cellulose that has been formed into lumps or balls into the mixing barrel in large quantities or directly.
3. The water temperature and the pH value of the water have a significant relationship with the dissolution of hydroxyethyl cellulose, so special attention should be paid to it.
4. Never add some alkaline substances to the mixture before the hydroxyethyl cellulose powder is warmed by water. Raising the PH value after warming is helpful for dissolution.
5. As far as possible, add antifungal agent as early as possible.
6. When using high-viscosity hydroxyethyl cellulose, the concentration of the mother liquor should not be higher than 2.5-3%, otherwise the mother liquor is difficult to operate. The post-treated hydroxyethyl cellulose is generally not easy to form lumps or spheres, and it will not form insoluble spherical colloids after adding water.
Post time: Nov-11-2022