Hydroxypropyl methylcellulose (HPMC)

HPMC is a non-ionic cellulose ether obtained from natural polymer materials through a series of chemical processing. In order to meet the needs of green environmental protection, our company specially develops and produces Fuqiang brand products for the building materials industry. It has the characteristics of high water retention, good dispersibility, good fineness, good workability, and convenient dissolution; it is suitable for dry powder mortar building materials, interior and exterior walls. Water-resistant putty powder (paste), adhesive, caulking agent, interface agent, water-based paint, self-leveling agent and other new building materials. In the production of building materials, cellulose ether is an indispensable additive.

Skills requirement

Note: The temperature of 2% aqueous solution at 20°C. The above specifications are all cold water dispersion type (delayed dissolution), S means that the model is cold water dispersion type.

Product nature

1. Appearance: white or off-white powder.

2. Particle size; 100 mesh pass rate is greater than 98.5%; 80 mesh pass rate is 100%. The particle size of special specification is 40~60 mesh.

3. Carbonization temperature: 280-300℃

4. Apparent density: 0.25-0.70g/cm (usually around 0.5g/cm), specific gravity 1.26-1.31.

5. Discoloration temperature: 190-200℃

6. Surface tension: 2% aqueous solution is 42-56dyn/cm.

7. Solubility: soluble in water and some solvents, such as appropriate proportion of ethanol/water, propanol/water, etc. Aqueous solutions are surface active. High transparency and stable performance. Different specifications of products have different gel temperatures, and solubility changes with viscosity. The lower the viscosity, the greater the solubility. Different specifications of HPMC have different properties. The dissolution of HPMC in water is not affected by pH value.

8. HPMC also has the characteristics of thickening ability, salt resistance, low ash powder, pH stability, water retention, dimensional stability, excellent film-forming properties, and a wide range of enzyme resistance, dispersibility and cohesiveness.

Dissolution method

1. All models can be added to the material by dry mixing;

2. When it needs to be directly added to the normal temperature aqueous solution, it is best to use the cold water dispersion type, and it usually takes 10 minutes to thicken after adding;

3. Ordinary models can be dissolved by stirring and dispersing with hot water first, then adding cold water, stirring and cooling;

4. If there is agglomeration and wrapping during dissolving, it is because the stirring is not sufficient or the ordinary model is directly added to the cold water. At this time, it should be stirred quickly.

Application field

construction industry

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

2. Tile cement: Improve the plasticity and water retention of pressed tile mortar, improve the bonding force of tiles, and prevent chalking.

3. Coating of refractory materials such as asbestos: as a suspending agent and a fluidity improver, it also improves the bonding force to the substrate.

4. Gypsum coagulation slurry: improve water retention and processability, and improve 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 putty based on resin latex.

7. Stucco: As a paste instead of natural materials, it can improve water retention and improve the bonding force with the substrate.

8. Coating: As a plasticizer for latex coatings, it has a role in improving the operational performance and fluidity of coatings and putty powder.

9. Spray coating: It has a good effect on preventing cement-based or latex-based spraying only material filler from sinking and improving fluidity and spray pattern.

10. Secondary products of cement and gypsum: It is used as extrusion molding binder for hydraulic substances such as cement-asbestos series to improve fluidity and obtain uniform molded products.

11. Fiber wall: It is effective as a binder for sand walls due to its anti-enzyme and anti-bacterial effect.

12. Others: It can be used as a bubble retainer for thin mortar and plastering operator (PC version)

chemical industry

1. Polymerization of vinyl chloride and vinylidene: As a suspension stabilizer and dispersant during polymerization, it can be used together with polyvinyl alcohol (PVA) hydroxypropyl cellulose (HPC) to control particle shape and particle distribution.

2. Adhesive: As the adhesive of wallpaper, it can usually be used together with vinyl acetate latex paint instead of starch.

3. Pesticides: added to pesticides and herbicides to improve the adhesion effect during spraying.

4. Latex: improve the emulsion stabilizer of asphalt latex, and the thickener of styrene-butadiene rubber (SBR) latex.

5. Binder: used as a molding adhesive for pencils and crayons.

Cosmetics

1. Shampoo: Improve the viscosity of shampoo, detergent and detergent and the stability of air bubbles.

2. Toothpaste: Improve the fluidity of toothpaste.

food industry

1. Canned citrus: to prevent whitening and deterioration due to the decomposition of citrus glycosides during preservation to achieve the effect of preservation.

2. Cold food fruit products: add to sherbet, ice, etc. to make the taste better.

3. Sauce: as an emulsifying stabilizer or thickening agent for sauces and ketchup.

4. Cold water coating and glazing: used for frozen fish storage, it can prevent discoloration and quality degradation. After coating and glazing with methyl cellulose or hydroxypropyl methyl cellulose aqueous solution, it is then frozen on ice.

5. Adhesives for tablets: As a molding adhesive for tablets and granules, it has good "simultaneous collapse" (rapidly melted and collapsed dispersibility when taking it).

Pharmaceutical industry

1. Encapsulation: The encapsulating agent is made into a solution of an organic solvent or an aqueous drug tablet, especially the prepared granules are sprayed and encapsulated.

2. Retarder: With the feeding amount of 2-3 grams per day, 1-2G each time, the effect will be shown in 4-5 days.

3. Eye drops: Since the osmotic pressure of methyl cellulose aqueous solution is the same as that of tears, it is less irritating to the eyes. It is added to the eye drops as a lubricant for contacting the eye lens.

4. Jelly: as the base of jelly-like external medicine or ointment.

5. Impregnation drug: as thickener and water-retaining agent.

Kiln industry

1. Electronic materials: As a ceramic electric sealer, the extruded binder of ferrite bauxite magnets can be used together with 1.2-propanediol.

2. Glaze: used as a glaze for ceramics and in combination with enamel, it can improve adhesiveness and workability.

3. Refractory mortar: added to refractory brick mortar or pouring furnace materials to improve plasticity and water retention.

Other industries

1. Fiber: used as printing dye paste for pigments, boron-based dyes, basic dyes, and textile dyes. In addition, in the corrugated processing of kapok, it can be used together with thermosetting resins.

2. Paper: used for the surface glue and oil-resistant processing of carbon paper.

3. Leather: used as final lubrication or one-time adhesive.

4. Water-based ink: added to water-based ink and ink as a thickener and film-forming agent.

5. Tobacco: as a binder for regenerated tobacco.

Safety performance

health hazard

This product is safe and non-toxic, can be used as a food additive, has no heat, and is non-irritating to skin and mucous membranes.

environmental impact

Avoid random scattering to cause dust to fly and cause air pollution.

Physical and chemical hazards: Avoid contact with fire sources, and avoid the formation of a large amount of dust in a closed environment to prevent explosion hazards.

Transportation and storage matters

Pay attention to sunscreen, rainproof, moistureproof, avoid direct sunlight, and store in a dry place.