HPMC Hydroxypropyl Methylcellulose

HPMC Hydroxypropyl Methylcellulose Cellulose ether is a general term for a series of cellulose organisms produced by cooking, oxidation and etherification under certain conditions with natural refined cotton as raw material. It is a product in which the hydroxyl groups on the cellulose molecular chain are replaced by ether groups. 1. Hydroxypropyl Cellulose (HPMC) It is a non-ionic cellulose ether made from natural polymer materials through a series of chemical processing. It contains almost all the properties of cellulose (MC) and is an auxiliary agent for your production of building materials. In order to meet the needs of green environmental protection, our factory specially develops and produces Tasong brand products for the building materials industry, which have the characteristics of high water retention, good dispersibility, good fineness, good workability and easy dissolution; it is suitable for new building materials such as dry mortar building materials, water-resistant putty powder (paste) for internal and external walls, adhesives, caulking agents, interface agents, water-based coatings, self-leveling agents, etc. In the production of building materials, cellulose ether is an indispensable additive. After adding HPMC, the following properties can be improved: Water retention - enhance water retention, improve cement, gypsum building materials too fast drying and insufficient hydration caused by poor hardening, cracking and other phenomena. A. Workability - increase the plasticity of mortar, improve the industrial properties of construction and coating, and improve work efficiency; B. Adhesion - due to the improved plasticity of mortar, it can better bond the substrate and the adherend; C. Anti-slip - due to its thickening effect, it can prevent the occurrence of mortar and adherend slip during construction. II. Molecular Composition and Structural Foula HPMC (Hydroxypropyl Methy1 Cellulose) Where n represents the degree of polymerization, R is -H, -CH3 or -CH2CHOHCHs Where n represents polymerization degree, Ris-H, -CH3orCH2CHOHCH3. III. Physical and chemical properties: 1. Appearance: HPMC is a white or off-white fiber granular powder, odorless and tasteless. 2. Solubility: HPMC is almost insoluble in anhydrous ethanol, ether, and dissolves into clear or slightly turbid gel in cold water. HPMC is soluble in some organic solvents and in a mixed solvent of water and organic solvents. 3. Particle size: 100 mesh pass rate ≥ 98.5, 80 mesh pass rate 100%. 4. Apparent density: 0.30-0.70g/cm3, density 1.26-1.31g/cm3. IV. Product characteristics: 1. Salt resistance: HPMC is a non-ionic cellulose ether and not a polyelectrolyte. Therefore, it is relatively stable in aqueous solution in the presence of metal salts or organic electrolytes, but excessive addition of electrolytes can cause gelation and precipitation. 2. Surface activity: HPMC aqueous solution has surface activity and can be used as a colloid protective agent, emulsifier and dispersant. 3. Thermal gelation: When the HPMC aqueous solution is heated to a certain temperature, it becomes opaque, gels, and forms a precipitate, but when it is continuously cooled, it returns to the original solution state. The temperature at which this gelation and precipitation occurs mainly depends on their type, concentration, and heating rate. 4. PH-stability: The viscosity of the HPMC aqueous solution is almost unaffected by acid or alkali, and the pH value is relatively stable in the range of 3.0-11.0. 5. Water retention: HPMC is a high-efficiency water retention agent and is widely used in ceramics, building materials and many other aspects. 6. Adhesion: HPMC, as a high-performance adhesive, is used in pigments, papermaking, products and ceramic products. V. Dissolution method: HPMC products are directly added to water. It will produce coagulation and then dissolve, but this dissolution is slow and difficult. The following three dissolution methods are recommended. Users can choose a convenient method according to the usage: 1. Hot water method: Add 1/3 or 2/3 of the required amount of water to the container and heat it to above 80~C. Since HPMC does not dissolve in hot water. Therefore, HPMC can be evenly dispersed in hot water at the initial stage; then add the remaining amount of cold water or ice water to the hot water slurry, stir and cool the mixture. 2. Powder mixing method: HPMC powder particles are fully dispersed with equal or greater amounts of other powdered ingredients by dry mixing. Then add water to dissolve, and HPMC can be dissolved without agglomeration. 3. Organic solvent wetting method: HPMC is pre-dispersed or wetted with organic solvents such as ethanol, ethylene glycol or oil, and then added with water to dissolve. Then HPMC can also be dissolved smoothly at this time. VI. Main uses: HPMC can be used as a thickener, dispersant, emulsifier and film-forming agent. Its industrial-grade products can be used in daily chemicals, synthetic resins, construction and coatings. 1. Suspension polymerization: In the production of synthetic resins, such as polyvinyl chloride (PVC), polyvinylidene chloride and other copolymers, suspension polymerization is often used and requires stable hydrophobic monomers suspended in water. HPMC products have good surface activity as water-soluble polymers. It also acts as a colloid protective agent, which can effectively prevent the aggregation of polymer particles. Furthermore, although HPMC is a water-soluble polymer, it is also slightly soluble in hydrophobic monomers and increases the monomer porosity of the polymer particles, so it can provide the polymer with a good ability to remove residual monomers and enhance the absorption of plasticizers. 2. In the formulation of building materials, it can be used for: (1) Water-resistant putty powder (2) Cement mortar (3) Bonding of cement-based bricks, tiles and base bricks; (4) Plaster based on gypsum board; Cement-based structural plaster.