KimaCell® HPMC MP200M is hydroxypropyl Methyl cellulose ether with the highest viscosity for dry mixed mortar. A new type of mortar plasticizer is obtained by compounding a cationic surfactant with certain plasticizing, thickening and water-retaining functions and an appropriate amount of hydroxypropyl methylcellulose ether. It can form lasting foaming and stabilizing ability, and the small spacing can obviously improve the workability of mortar, and can quickly disperse cement particles, accelerate cement hydration reaction, improve mortar strength, frost resistance and impermeability, and reduce mortar shrinkage.
HPMC MP200M is water-retaining thickener is an essential component of ready-mixed mortar. In drymix mortar, hydroxypropyl methyl cellulose is generally selected KimaCell® HPMC MP200M, and the water retention rate can be increased to more than 90%. The method of HPMC use in dry mortar is to add water directly after the dry powder is evenly mixed. The high water retention of HPMC MP200M can fully hydrate the cement, significantly increase the bond strength, and at the same time appropriately increase the tensile and shear strength. HPMC MP200M can greatly improve the construction effect and improve work efficiency.
|Chemical name||Hydroxypropyl Methyl Cellulose|
|Synonym||Cellulose ether; Hypromellose; Cellulose, 2-hydroxypropyl methyl ether; Hydroxypropyl methyl cellulose; HPMC; MHPC|
|Product Grade||HPMC MP200M|
|Solubility||Water Soluble Cellulose Ether|
|Physical form||White to off-white cellulose powder|
|Viscosity Brookfield 2% solution||Min70000 mPa.s|
|Viscosity NDJ 2% solution||160000-240000 mPa.S|
|Mesh size||99% pass 100 mesh|
KimaCell® HPMC MP200M can be used in dry mixed mortar. There are several features of cellulose ether as bellow:
The fineness of cellulose ether
The fineness of cellulose ether affects its solubility. Therefore, the fineness of cellulose ether should be included as one of its investigation properties. Generally speaking, the sieve residue of cellulose ether fineness exceeding 0.212mm should not exceed 8.0%.
Drying weight loss rate
The drying weight loss rate refers to the percentage of the mass of the lost material in the mass of the original sample when the cellulose ether is dried at a certain temperature. For a certain quality of cellulose ether, the drying weight loss rate is too high, which will reduce the content of active ingredients in cellulose ether, affect the application effect of downstream enterprises, and increase the purchase cost. Usually, the weight loss on drying of cellulose ether is not more than 6.0%.
Sulfate ash content of cellulose ether
For a certain quality of cellulose ether, the ash content is too high, which will reduce the content of active ingredients in cellulose ether and affect the application effect of downstream enterprises. The sulfate ash content of cellulose ether is an important measure of its own performance. Combined with the production status of the existing cellulose ether manufacturers in my country, the ash content of MC, HPMC and HEMC should not exceed 2.5%, and the ash content of HEC cellulose ether should not exceed 10.0%.
Viscosity of cellulose ether
The water retention and thickening effect of cellulose ether mainly depends on the viscosity and dosage of cellulose ether itself added to the cement slurry.
The pH value of cellulose ether
The viscosity of cellulose ether products will gradually decrease after being stored at a higher temperature or for a long period of time, especially for high-viscosity products, so it is necessary to limit the pH. Generally, it is advisable to control the pH range of cellulose ether to 5-9.
Light transmittance of cellulose ether
The light transmittance of cellulose ether directly affects its application effect in building materials. The main factors affecting the light transmittance of cellulose ether are: (1) the quality of raw materials; (2) the effect of alkalization; (3) the process ratio; (4) solvent ratio; (5) neutralization effect.
According to the use effect, the light transmittance of cellulose ether should not be less than 80%.
The gel temperature of cellulose ether
Cellulose ether is mainly used as viscosifier, plasticizer and water retention agent in cement products, so viscosity and gel temperature are important measures to characterize the quality of cellulose ether. The gel temperature is used to determine the type of cellulose ether, which is related to the degree of substitution of cellulose ether. Therefore, in cement products, the temperature is usually controlled below the initial gel temperature. Under this condition, the lower the temperature, the higher the viscosity, and the more obvious the effect of thickening and water retention.