Views: 0 Author: Site Editor Publish Time: 2022-06-09 Origin: Site
Hydroxypropyl methyl cellulose and sodium carboxymethyl cellulose is likely to have a lot of practical significance to similar chemicals, they may be so, but if we don't think like that, so, in the manufacture if we also think so, it may cause very bad bad influence, after all, if theemotions to not look from the outside world.
Easy to disperse in water to complete transparent aqueous gel, insoluble in alcohol and other organic solutions. Proper water retention in mortar can make concrete have a longer hydration time, and the water retention ability is positively correlated with the viscosity of cellulose ether aqueous solution, the higher the viscosity, the stronger the water retention ability. Because for equal aqueous solutions of carboxymethyl cellulose, the water flow increases, indicating a decrease in viscosity.
Hydroxypropyl methyl cellulose for off-white or milky fiber or granular powder, odorless, odorless. Dissolved in water to produce a responsive or slightly turbid colloid solution; Insoluble in industrial ethanol, ether or medical ether; It can be quickly dispersed in boiled water at 80-90℃ and quickly dissolved after refrigeration. At room temperature, the solution is relatively stable, high temperature can be suspected glue, with the rise of temperature and the transformation of aqueous solution, can be converted to each other.
Sodium carboxymethyl cellulose is a cationic cellulose ether in cellulose carboxymethyl ether, is milky or milky white fiber powder or particulate matter, relative density of 0.5-0.7 g /cm3, basically odorless, odorless, moisture absorption. Easy to disperse in water to complete transparent aqueous gel, insoluble in alcohol and other organic solutions. At pH values of 6.5-8.5, the viscosity of slurry decreases significantly at pH>10 or <5, and performs well at pH=7. The viscosity rises rapidly below 20℃, and the transition is slow at 45℃. Heating beyond 80℃ for a long time will make the colloid solution convertible, but the viscosity and performance are significantly reduced. Soluble strong electrolyte. Aqueous solution transparent; In alkaline solution is very stable, but encountered acidysis, PH value at 2-3 will produce deposition, flagellar antigen metal salt will also produce deposition.
Obviously, the two in the characteristics and other problems or have a great difference, so in the production and manufacturing we must be more concerned about, see the specific situation must be sodium carboxymethyl cellulose or other chemicals, so as to ensure that you can faster production and manufacturing.
Hydroxymethyl cellulose is widely used, widely used, not only in some video industry has effective practical effect, and in industrial production is also a good main performance, so what role will be added to cement mortar?
1. Maintain moisture: Carboxymethyl cellulose prevents moisture from seeping into walls. Proper water retention in mortar can make concrete have a longer hydration time, and the water retention ability is positively correlated with the viscosity of cellulose ether aqueous solution, the higher the viscosity, the stronger the water retention ability. As water content rises, water retention decreases. Because for equal aqueous solutions of carboxymethyl cellulose, the water flow increases, indicating a decrease in viscosity. The improvement of water retention performance will increase the dry setting time of cement mortar under construction.
2. Wetting ability: all retarders have the effect of wetting agent, because it reduces the interfacial tension, so that the ultrafine powder in cement mortar and water mix and disperse.
3. Bubble composition: high bubble composition, high production of cement mortar, good engineering construction performance, resulting in less gap. In addition, hardness values will continue to be reduced and "vaporization" will occur. The total number of bubbles is generally in mixing time. Carboxymethyl cellulose is widely used in concrete, plaster of Paris and other materials with water condensation performance improvement. Cement mortar in the water retention performance is good, can increase the rectification device time and open time, reduce the loss of light of cement mortar.
4. Excellent anti-flow hanging cement mortar represents the risk of not easy to lose light and dirty in thick layer engineering construction. With engineering construction special type of carboxymethyl cellulose can improve the anti - hanging performance. In particular, the new construction of carboxymethyl cellulose, with a good anti-hanging performance.
In addition, carboxymethyl cellulose can improve the construction, with moisture absorption, heat resistance to light, the use of goods can improve the engineering construction performance of cement mortar.
Sodium carboxymethyl cellulose is widely used and widely used, so its price has been a very concerned problem. Therefore, the value of the key to suffer from what aspects of harm, why the price of each manufacturer are different?
1. As we all know, the degree of substitution (DS) and purity is to consider the specific index value of sodium carboxymethyl fiber quality. In general, DS and sodium carboxymethyl fiber properties are different; The substitution degree is improved, the solubility will be improved, the clarity and reliability of aqueous solution will be improved, the actual effect of the application of equipment is not the same as the substitution degree and purity, of course, the price will have a certain difference.
2. According to the purpose of application, it can be divided into bonding. Thickening. Emulsion. Holding water. Anti deposition, frame reinforcement, so there are differences between the two.
3 harm the properties of sodium carboxymethyl cellulose for many reasons, including raw materials from the characteristics, average molecular weight size, throughout the curve, carboxymethylation ratio, carboxymethylation symmetry, salt slag composition, powder particle size, filling characteristics, which may be the price of the influencing factors.
Fields such as crude oil offshore drilling platforms must be resistant to deposition and not have high viscosity; Whitening toothpaste CMC regulation has thickening, so the viscosity is high.
On the whole, the performance of sodium carboxymethyl fiber in various fields is not the same, so its price will be different. Purchase must be based on their specific requirements and application performance, select their own goods, price elements for reference only.