Commonly used cellulose ethers include HEC, HPMC, CMC, PAC, MHEC, etc. Nonionic water-soluble cellulose ether has cohesiveness, dispersion stability and water retention capacity, and is a useful additive for building materials. HPMC, MC or EHEC are used in most cement-based or gypsum-based constructions, such as masonry mortar, cement mortar, cement coating, gypsum, cementitious mixture and milky putty, etc., which can enhance the dispersion of cement or sand and greatly improve the Adhesion, which is very important for plaster, tile cement and putty. HEC is used in cement, not only as a retarder, but also as a water-retaining agent, and HEHPC is also used in this regard. MC or HEC are often used together with CMC as a solid part of the wallpaper. Medium-viscosity or high-viscosity cellulose ethers are commonly used in wallpaper glued building materials.
Hydroxypropyl methylcellulose HPMC is generally used in the production of interior and exterior wall putty powder with a viscosity of 100,000 cellulose, in dry powder mortar, diatom mud and other building material products, cellulose with a viscosity of 200,000 is commonly used, and in self-leveling and other special mortars, cellulose with a viscosity of 400 is commonly used. Viscosity cellulose, this product has good water retention effect, good thickening effect and stable quality. HPMC is widely used in the building materials industry and is used in a large amount. Cellulose can be used as a retarder, water retention agent, thickener and binder. Cellulose ether plays an important role in ordinary dry-mixed mortar, external wall insulation mortar, self-leveling mortar, dry powder plastering adhesive, tile bonding mortar, putty powder, interior and exterior wall putty, waterproof mortar, thin-layer joints, etc. , they have an important influence on the water retention, water demand, firmness, retardation and workability of the stucco system.
Hydroxypropyl methylcellulose HPMC products combine many physical and chemical properties to become a unique product with multiple uses. The various properties are as follows:
◆Water retention: It can maintain moisture on porous surfaces such as wall cement boards and bricks.
◆Film-forming: It can form a transparent, tough and soft film with excellent oil resistance.
◆Organic Solubility: The product is soluble in some organic solvents, such as ethanol/water, propanol/water, dichloroethane and a solvent system composed of two organic solvents.
◆Thermal gelation: The aqueous solution of the product will form a gel when it is heated, and the formed gel will become a solution again after cooling.
◆Surface activity: Provide surface activity in the solution to achieve the required emulsification and protective colloid, as well as phase stabilization.
◆Suspension: Hydroxypropyl methylcellulose can prevent solid particles from settling, thus inhibiting the formation of precipitates.
◆Protective colloid: It can prevent droplets and particles from coalescing or coagulating.
◆Adhesiveness: Used as an adhesive for pigments, tobacco products, and paper products, it has excellent functions.
◆Water Solubility: The product can be dissolved in water in different quantities, and its maximum concentration is only limited by viscosity.
◆Non-ionic inertness: The product is a non-ionic cellulose ether, which does not combine with metal salts or other ions to form insoluble precipitates.
◆Acid-base stability: suitable for use within the range of PH3.0-11.0.
◆Tasteless and odorless, not affected by metabolism; used as food and drug additives, they will not be metabolized in food, and will not provide heat.
Post time: Dec-28-2022