HPMC Appearance and properties: white or off-white fibrous or granular powder
Density: 1.39 g/cm3
Solubility: almost insoluble in absolute ethanol, ether, acetone; swelling into a clear or slightly cloudy colloidal solution in cold water
HPMC Stability: The solid is flammable and incompatible with strong oxidants.
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 specifications 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. Color changing temperature: 190-200℃
6. Surface tension: 2% aqueous solution is 42-56dyn/cm.
7. Solubility: soluble in water and some solvents, such as ethanol/water, propanol/water, etc. in an appropriate proportion. 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. With the decrease of methoxy group content, the gel point increases, the water solubility decreases, and the surface activity of HPMC decreases.
9. 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.
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. After adding, it usually takes 10-90 minutes to thicken;
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.
5. If bubbles are generated during dissolution, it can be left for 2-12 hours (the specific time is determined by the consistency of the solution) or removed by vacuuming, pressurizing, etc., or adding an appropriate amount of defoaming agent.
This product is used in the textile industry as a thickener, dispersant, binder, excipient, oil-resistant coating, filler, emulsifier and stabilizer. It is also widely used in synthetic resin, petrochemical, ceramics, paper, leather, medicine, food and cosmetics industries.
The main purpose
1. Construction industry: As a water-retaining agent and retarder for cement mortar, it makes the mortar pumpable. Used as a binder in plastering slurry, gypsum, putty powder or other building materials to improve spreadability and prolong operation time. It is used as a paste for ceramic tile, marble, plastic decoration, as a paste enhancer, and it can also reduce the amount of cement. The water retention of HPMC can prevent the slurry from cracking due to drying too fast after application, and enhance the strength after hardening.
2. Ceramic manufacturing: widely used as a binder 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 a 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. Plastic: used as molding release agent, softener, lubricant, etc.
6. Polyvinyl chloride: It is used as a dispersant in the production of polyvinyl chloride, and it is the main auxiliary agent for the preparation of PVC by suspension polymerization.
7. Others: This product is also widely used in leather, paper products, fruit and vegetable preservation and textile industries.
8. Pharmaceutical industry: coating materials; film materials; rate-controlling polymer materials for sustained-release preparations; stabilizers; suspending agents; tablet binders; tackifiers
Use in specific industries
construction industry
1. Cement mortar: improve the dispersibility of cement-sand, greatly improve the plasticity and water retention of mortar, and effectively prevent cracks and enhance the strength of cement.
2. Tile cement: Improve the plasticity and water retention of the pressed tile mortar, improve the bonding force of the tiles, and prevent pulverization.
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 the cement-based or latex-based spray material filler from sinking and improving the fluidity and spray pattern.
10. Secondary products of cement and gypsum: It is used as extrusion molding binder for hydraulic materials such as cement-asbestos 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 effects.
12. Others: It can be used as a bubble retainer for thin mortar and plasterer operators (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 vinyl 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: when added to pesticides and herbicides, it can 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 storage 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. Coating and glazing in cold water: It is used for frozen fish storage, which can prevent discoloration and deterioration of quality. 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 bonding “simultaneous collapse” (rapidly melted, collapsed and disperse when taking it).
Pharmaceutical industry
1. Coating: The coating agent is prepared into a solution of an organic solvent or an aqueous solution for drug administration, especially the prepared granules are spray-coated.
2. Retarder: 2-3 grams per day, 1-2G feeding amount 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 material of jelly-like external medicine or ointment.
5. Impregnation medicine: as thickening agent and water-retaining agent.
Kiln industry
1. Electronic materials: As a binder for ceramic electric seals and ferrite bauxite magnets, it can be used together with 1.2-propylene glycol.
2. Glaze: Used as a glaze for ceramics and in combination with enamel, it can improve the bondability and processability.
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 corrugation processing of kapok, it can be used together with thermosetting resin.
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.
Post time: Oct-19-2022