Construction Grade Hydroxypropyl Methyl Cellulose HPMC
Production process of Hydroxypropyl Methyl Cellulose HPMC:
Treat the refined cotton cellulose with lye at 35-40 ℃ for half an hour, press, crush the cellulose, and properly age at 35 ℃, so that the average polymerization degree of the alkali fiber obtained is within the required range. Put the alkali fiber into the etherification kettle, add propylene oxide and methyl chloride in turn, etherify at 50-80 ℃ for 5h, and the maximum pressure is about 1.8MPa. Then add proper amount of hydrochloric ACID and Oxalic Acid to wash the material in 90 ℃ hot water to make the volume expand. Dehydrate with centrifuge. Wash to neutral. When the water content in the material is less than 60%, dry it to less than 5% with 130 ℃ hot air flow. Finally, the finished product is crushed through 20 mesh sieve.
Specification of Construction Grade HPMC:
| ITEM | STANDARDS |
| Appearance | White or off-white powder |
| Methoxyl Content(%) | 19~30 |
| Hydroxypropoxyl Content(%) | 4~12 |
| Moisture(%) | ≤5.0 |
| Ash(%) | ≤1 |
| PH-Value | 4-8 |
| Chloride(NaCl)% | ≤0.2 |
| Arsenic Salt (ppm) | ≤2 |
| heavy metal (ppm) | ≤20 |
| Viscosity 2% in water at 20℃(mpa.s) | 5~180000 |
Application of Hydroxypropyl Methyl Cellulose:
1.HPMC Used In Construction Industry: As a water-retaining agent and retarder of cement mortar, it makes the mortar pumpable. When plastering mortar, gypsum, putty powder or other building materials as adhesives, improve the coating ability and extend the operational time. It can be used to paste ceramic tile, marble, plastic decoration, paste reinforcing agent, and also reduce the amount of cement. The water retention property of HPMC makes the slurry not crack due to drying too fast after application, and enhances the strength after hardening.
2. HPMC Used In Ceramic Manufacturing Industry: widely used as adhesive in ceramic product manufacturing.
3. HPMC Used In Coating Industry: as thickener, dispersant and stabilizer in the coating industry, it has good phase solubility in water or organic solvent. As paint remover.
4.HPMC Used In Ink Printing: As a thickener, dispersant and stabilizer in the ink industry, it has good solubility in water or organic solvents.
5. HPMC Used In Plastic: used as forming release agent, softener, lubricant, etc.
6. HPMC Used In PVC: used as dispersant in the production of PVC, is the main auxiliary for the preparation of PVC by suspension polymerization.
7. HPMC For Other Usage: This product is also widely used in leather, paper products, fruit and vegetable preservation and textile industries.
8. Pharmaceutical industry: coating materials; Membrane material; Speed control polymer material of sustained-release preparation; Stabilizer; Suspension aids; Tablet adhesive; Tackifier.
Packing of Construction Grade HPMC:
The package of Construction Grade HPMC is double-layer polyethylene film bag, pearlescent film woven bag, net weight of each bag is 25kg.
Except Construction Grade HPMC,we can also supply Titanium Dioxide R996, Carbon Black N330,PVA Resin 2488, PVA Resin 1788,EVA Resin etc.
Product Categories : Chemical Additives > HPMC
