Hydroxypropyl Methylcellulose

Hydroxypropyl Methylcellulose is a non-ionic cellulose ether made through a series of chemical processes, with the natural polymer cellulose as the raw material. It is odorless, tasteless and non-toxic white powder. In cold water, it swells into a clear or slightly turbid colloidal solution. Hydroxypropyl Methylcellulose and Methylcellulose can be used in building materials, coating industry, synthetic resin, ceramic industry, medicine, food, textile, agriculture, daily chemicals and other industries.

Major Applications of Hydroxypropyl Methylcellulose in Building Materials

1. Cement-based Plastering Mortar

1) Improve the homogeneity, enabling plastering mortar easier for trowel coating, while improving the sag resistance, enhancing liquidity and pumpability and improving the working efficiency.

• Increase the water retention, extend the storage time of mortar and improve the working efficiency, beneficial for mortar hydration and solidification to produce high mechanical strength.

3). Control the air entrainment, thus eliminating the cracks on the surface of coatings and forming an ideal smooth surface.

2. Gypsum-based Plastering Mortar and Gypsum Products

1) Improve the homogeneity, enabling plastering mortar easier for trowel coating, while improving the sag resistance, enhancing liquidity and pumpability and improving the working efficiency.

• Increase the water retention, extend the storage time of mortar and improve the working efficiency, beneficial for mortar hydration and solidification to produce high mechanical strength.

3). Control the uniform consistency of mortar and form an ideal surface coating.

3. Masonry Mortar

1). Enhance the adhesion onto the masonry surface, improve the water retention and increase the mortar strength.

• . Improve the lubricity, plasticity and application properties; the mortar improved by the use of cellulose ether is easier for construction, saves the construction time and reduces the construction cost.

• . Cellulose ethers with particularly high water retention apply to highly water-absorbent bricks.

4. Panel Joint Fillers

1). Feature excellent water retention, extend the opening time and improve the working efficiency; act as a high-quality lubricant, easier for mixing.

• . Increase the resistance to shrinkage and cracking; improve the quality of coating surface.

• . Enhance the adhesion of bonding surface; provide with a flat and smooth texture.

5. Ceramic Tile Adhesives

• . Facilitate the dry mixing of ingredients without producing clumps; increase the application speed; improve the application performance; save the working time; and reduce the working cost.

2). Improve the tiling efficiency and provide with excellent adhesion effects by extending the opening time.

6. Self-Leveling Flooring Materials

1). Provide with the viscosity and act as an anti-settling additive.

• . Enhance the liquidity pumping and improve the flooringefficiency.

• . Control the water retention and shrinkage property, and reduce cracking and shrinkage of floor.

7. Water-based Coatings

1). Prevent the solid precipitation and extend the shelf life. Feature high biological stability and excellent compatibility with other components.

2). Improve the liquidity, provide with favorable splash-proof, anti-sag and leveling properties, and ensure excellent surface finish.

8. Wallpaper Powder

1). Dissolve quickly without lumps, conducive to mixing.

• . Provide with high bond strength.

9. Extruded Cement Panels

1). Feature high bonding and lubricity; enhance the processing properties of extruded products.

• . Improve the green strength, promote hydration and solidification effects, and increase the rate of finished products.

10. Dedicated Hydroxypropyl Methylcellulose Products for Ready-mixed Mortar

HPMC (Hydroxypropyl MethylCellulose)

Hydroxypropyl MethylCellulose is a non-ionic cellulose ether, in the appearance of white powder, odorless and tasteless. It is soluble in water, most polar organic solvents, and the appropriate proportion of ethanol/water, propanol /water and dichloroethane, but insoluble in diethyl ether, acetone, and anhydrous alcohol. In cold water, it will swell into a clear or slightly turbid colloidal solution.

Its aqueous solution has surface activity, high transparency and stable properties. Hydroxypropyl MethylCellulose has thermal gelation properties, so after heating the aqueous solution will precipitate and form gels, and dissolve again after cooling. Products of different specifications have different gelling temperatures. Its solubility varies with the viscosity, and the lower the viscosity is, the greater the solubility will be. There are some differences in the properties of Hydroxypropyl MethylCellulose of different specifications. The dissolution of Hydroxypropyl MethylCellulose in water is not affected by the pH value.

1. Stability

Hydroxypropyl MethylCellulose has many features such as thickening power, salt discharge performance, pH stability, water retention, excellent film-forming properties, extensive resistance to enzymes, dispersion and adhesion.

In latex paints and water-soluble resin coatings, Hydroxypropyl MethylCellulose acts as film-forming agents, thickeners, emulsifiers and stabilizers, making the coating film with good wear resistance, leveling property, and adhesion, and improving the surface tension, pH stability, and compatibility with metal color materials. In the water-based paints, Hydroxypropyl MethylCellulose has excellent storage stability, maintains uniform viscosity, makes pigments uniformly dispersed, and basically won’t be affected by the pH value.

2. Water-holding Property

In putty, the main roles of celluloses are water retention, adhesion, lubrication and so on. Hydroxypropyl MethylCellulose has high water-holding performance, surface opticity and improves uniformity. This helps to avoid crusting and off-powder phenomena, improve resistance to shrinkage, cracking and vertical flow, and to improve the work efficiency since the painting job is comfortable and saves effort.

3. Dispersibility

In the production of synthetic resin, Hydroxypropyl MethylCellulose plays the role of protective colloidal agents and can effectively prevent polymeric particles from agglomerating. In the floating polymerization of vinyl chloride (VC), the disperse system has a direct impact on the product, PVC resin, and the quality of processing and products. It helps to improve the thermal stability of the resin and control the particle size distribution(that is, adjust the density of PVC). PVC resins made from high-quality cellulose ethers not only can ensure that the performance meets international standards, but also have apparent physical properties, fine particle characteristics and excellent melting rheological behavior.

4. Adhesion

In such materials as the adhesive mortar and surface mortar in the thermal mortar system, celluloses mainly plays a role of bonding, water retention and increasing strength. It also helps to improve construction, water-retaining property and resistance to hanging. Furthermore, it improves the resistance to vertical flow, shrinkage and cracking, and thus improves the bonding strength and the work efficiency.

5. Thickening Property

In interface agents, Hydroxypropyl MethylCellulose mainly functions as the thickening agent and can increase the the tensile strength and flexural strength. It also helps to improve surface coatings, enhance adhesion and improve the bonding strength of mortar. Furthermore, good permeability can improve the uniformity of the interface, enhance lubricity and fluidity of mortar, make coating easier and thus improve work efficiency.

6. Constructability

In the bonding of tiles, tile adhesives can function as water-retaining agent and adhesives, and can greatly improve construction performance of adhesives, allow longer opening hours and greater cohesion, and prevent falling of tiles due to excessive water loss. Hydroxypropyl MethylCellulose has the properties of improving the workability, good water-retaining property, enhancing adhesion and high resistance to hanging. Hydroxypropyl MethylCellulose can improve the sticking and tiling efficiency, and also enhance bonding strength and shear strength.

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