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Hydroxypropyl Methylcellulose
  • Hydroxypropyl MethylcelluloseHydroxypropyl Methylcellulose

Hydroxypropyl Methylcellulose

Qingdao Shuodi Environmental Protection Technology Co., Ltd. is a Chinese supplier specializing in the production of hydroxypropyl methylcellulose. Hydroxypropyl methylcellulose, also known as hypromellose and cellulose hydroxypropyl methyl ether, is made from highly pure cotton cellulose and specially etherified under alkaline conditions.

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Product Description

As the professional manufacture, we would like to provide you high quality Shuodi Hydroxypropyl Methylcellulose. And we will offer you the best after-sale service and timely delivery. hydroxypropyl methylcellulose is soluble in water and most polar c and appropriate proportions of ethanol/water, propanol/water, dichloroethane, etc., insoluble in ether, acetone, absolute ethanol, and in cold water It swells into a clear or slightly cloudy colloidal solution. The aqueous solution has surface activity, high transparency and stable performance. Hydroxypropyl methylcellulose HPMC has the property of thermal gelation. After the aqueous solution of the product is heated, it forms a gel and precipitates, and dissolves after cooling. The gelation temperature of different specifications of the product is different. Solubility varies with viscosity. The lower the viscosity, the greater the solubility. Different specifications of hydroxypropyl methylcellulose HPMC have certain differences in their properties, and the dissolution of HPMC in water is not affected by the pH value. Particle size: 100 mesh pass rate is greater than 98.5%. Bulk density: 0.25-0.70g/ (usually around 0.4g/), specific gravity 1.26-1.31. Discoloration temperature: 180-200°C, carbonization temperature: 280-300°C. The methoxyl value ranges from 19.0% to 30.0%, and the hydroxypropyl value ranges from 4% to 12%. Viscosity (22°C, 2%) 5~200000mPa .s. The gel temperature (0.2%) is 50-90°C. HPMC has the characteristics of thickening ability, salt discharge, PH stability, water retention, dimensional stability, excellent film-forming property, and wide range of enzyme resistance, dispersibility and cohesiveness.

Hydroxypropyl methylcellulose Physical and chemical properties:

1. Appearance: white or white powder

2. Particle size: 100 mesh pass rate is greater than 98.5%, 80 mesh pass rate is greater than 100%

3. Carbonization temperature: 280-300°C

4. Apparent density: 0.25-70g/cm3 (usually 0.5/cm3), specific gravity 1.26-1.31

5. Discoloration temperature: 190-200°C

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

7. Soluble in water and some organic solvents, such as ethanol, water, dichloroethane, etc. in an appropriate proportion. Aqueous solutions are surface active. High transparency, stable performance, different specifications of products have different gel temperatures, solubility changes with viscosity, the lower the viscosity, the greater the solubility, different specifications of HPMC have certain differences in performance, and the dissolution of HPMC in water is not affected by the pH value.

8. With the reduction of methoxyl content, the gel point of HPMC increases, the water solubility decreases, and the surface activity also decreases.

9. HPMC has the characteristics of layer thickening ability, low ash content, PH stability, water retention, excellent film-forming property, and wide range of enzyme resistance, dispersibility and cohesiveness.

The main application of hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose is an industrial grade HOMC, which is mainly used as a dispersant in the production of polyvinyl chloride, and is the main auxiliary agent for the preparation of PVC by suspension polymerization. In addition, thickeners, stabilizers, emulsifiers, excipients, water-retaining agents, film-forming agents, etc. agent etc. The application in synthetic resin can make the obtained product have the characteristics of regular particle size, transportation, appropriate apparent specific gravity, and excellent processing performance. Thereby basically replacing gelatin and polyvinyl alcohol as dispersants. In addition, in the construction process of the building industry, it is mainly used for building walls and stucco decoration, with high bonding strength and can reduce the amount of cement. Used as a thickener in the paint industry, the visible layer is bright and delicate, does not come off powder, improves the leveling performance, etc. Used in plastering gypsum, bonding gypsum, caulking gypsum, and water-resistant putty, it can significantly improve its water retention and bonding strength.

How to use hydroxypropyl methylcellulose:

1. Add hydroxypropyl methylcellulose into hot water (80-90°C) with 1/3-1/5 of the required water volume, stir and disperse until it swells completely, then add the remaining cold water well and stir to cool down until completely dissolved.

2. The product with clean surface treatment can be directly dissolved in cold water under stirring. For rapid dissolution, use ammonia water or alkaline water to adjust the pH value to 8-10, and the product will quickly dissolve and form a solution.

3. First, make hydroxypropyl methylcellulose into a higher concentration mother liquor for later use (the method is the same as above). When using, add cold water and continue stirring until a uniform solution is formed.

4. Due to its good compatibility, hydroxypropyl methylcellulose can be directly mixed with most products, such as gypsum powder, cement, lime calcium powder, starch, etc.

Precautions for packaging and storage of hydroxypropyl methylcellulose

Packed in 25KG plastic-lined woven bags or paper-plastic composite bags. It can also be packed according to user requirements. When storing and transporting, pay attention to moisture-proof, and the number of stacking layers shall not exceed 20 layers.

The effective deposit period is 2-3 years.

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