Construction usage of HPMC(Hydroxypropyl methylcellulose)

Hydroxypropyl methylcellulose, also known as hydroxypropyl methylcellulose, is one of the non-ionic cellulose mixed ethers.

Appearance: white or off white fibrous or granular powder

Stability: solid is flammable and incompatible with strong oxidants.

Particle size; The passing rate of 100 mesh is more than 98.5%; The passing rate of 80 mesh is 100%. The particle size of special specifications is 40 ~ 60 mesh.

Carbonization temperature: 280-300 ℃

Apparent density: 0.25-0.70g/cm3 (usually about 0.5g/cm3), 

Apecific gravity: 1.26-1.31.

Discoloration temperature: 190-200 ℃

Surface tension: 42-56dyne / cm for 2% aqueous solution

Solubility: soluble in water and some solvents, such as appropriate proportion of ethanol / water, propanol / water, etc. Aqueous solution has surface activity. High transparency and stable performance. The gel temperature of products of different specifications is different, and the solubility changes with the viscosity. The lower the viscosity, the greater the solubility. The performance of HPMC of different specifications is different, and the dissolution of HPMC in water is not affected by pH value.

With the decrease of methoxyl content, the increase of gel point, the decrease of water solubility and the decrease of surface activity of HPMC.

HPMC also has the characteristics of thickening ability, salt resistance, low ash powder, pH stability, water retention, dimensional stability, excellent film-forming, extensive enzyme resistance, dispersion and adhesion.

It is used as thickener, dispersant, binder, excipient, oil resistant coating, filler, emulsifier and stabilizer in textile industry. It is also widely used in synthetic resin, petrochemical industry, ceramics, papermaking, leather, medicine, food, cosmetics and other industries.

Main purpose of Hydroxypropyl methylcellulose

1. Construction industry: as a water retaining agent and retarder of cement mortar, the mortar has pumpability. When plastering mortar, gypsum material, putty powder or other building materials, it can be used as adhesive to improve the smearability and prolong the operation time. It can be used for pasting ceramic tile, marble, plastic decoration and strengthening agent, and can also reduce the amount of cement. The water retention performance of HPMC prevents the slurry from cracking due to drying too fast after coating, and enhances the strength after hardening.

2. Ceramic manufacturing: widely used as adhesive in the manufacture of ceramic products.

3. Coating industry: as a thickener, dispersant and stabilizer in the coating industry, it has good compatibility in water or organic solvents. As paint remover.

4. Ink printing: as a thickener, dispersant and stabilizer in the ink industry, it has good compatibility in water or organic solvents.

5. Plastics: used as mold release agent, softener, lubricant, etc.

6. PVC: used as dispersant in PVC production, it is the main auxiliary agent for suspension polymerization to prepare PVC.

7. Pharmaceutical industry: coating materials; Membrane material; Speed control polymer material of sustained-release preparation; Stabilizer; Suspension aid; Tablet adhesive; Tackifier

8. Others: it is also widely used in leather, paper products industry, fruit and vegetable preservation and textile industry.

Specific industry application of Hydroxypropyl methylcellulose

Construction industry

1. Cement mortar: improve the dispersion of cement sand, greatly improve the plasticity and water retention of mortar, have an effect on preventing cracks and enhance the strength of cement.

2. Ceramic tile cement: improve the plasticity and water retention of pressed ceramic tile mortar, improve the glue relay of ceramic tile and prevent pulverization.

3. Coating of asbestos and other refractory materials: as a suspension safety agent and liquidity improver, it also improves the adhesive force to the substrate.

4. Gypsum concrete slurry: improve water retention and processability, and improve the adhesion to the substrate.

5. Joint cement: added to the joint cement for gypsum board to improve fluidity and water retention.

6. Latex putty: improve the fluidity and water retention of resin latex based putty.

7. Plaster: as a paste instead of natural substances, it can improve the water retention and improve the glue relay with the substrate.

8. Coating: as a plasticizer of latex coating, it plays a role in improving the operability and fluidity of coating and putty powder.

9. Spraying coating: it has a good effect on preventing the sinking of cement or latex spraying filler and improving the fluidity and spray pattern.

10. Secondary products of cement and gypsum: used as the press out molding binder of hydraulic substances such as cement asbestos system to improve the fluidity and obtain uniform molded products.

11. Fiber wall: due to the anti enzyme and anti-bacterial effect, it is effective as the adhesive of sand wall.

12. Others: it can be used as bubble retention agent for thin mortar, sand mortar and mud hydraulic operator.

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