羟丙基甲基纤维素

Hydroxypropyl methyl cellulose, also abbreviated as hypromellose, is a kind of non-ionic cellulose mixed ether. It is a semi-synthetic, inactive, viscoelastic polymer. Hypromellose manufactured by Feicheng Honrui Fine Chemicals Materials Manufacturer has the following characteristics and application.

Specifications

	HR-60
Hydroxypropyl(%)	28-30
Mechoxy(%)	7-12
Gel temperature	58-64
Loss on drying(%)	≤5
Residue on ignition(%)	≤5
ph(1% aqueous solution 25℃）	4---8
Chloride(%)	≤0.2
Arsenic （ppm）	≤2
Heavy Metal （ppm）	≤2
Viscosity (2% aqueous solution 20℃, mPa.s)	5-200,000

 

Physical and Chemical properties:

1. Appearance: white or off-white powder, tasteless and tasteless

2. Granularity: ≧98.5% (100 M) ;100% (80 M).

3. Carbonization Temperature: 280-300℃.

4. Apparent Density: 0.25-0.70g/ (0.5g more or less), Specific gravity 1.26-1.31.

5. Discoloration Temperature: 190-200℃.

6. Surface tension: 42-56dyn/cm (20% aqueous solution).

 

7.Solubility:soluble in water and some organic solvents, in a certain proportion, such as ethanol/water, propanol/water, dichloroethane, etc. The aqueous solution has surface activity, high transparency and stable performance. The products with different specifications have different gel temperatures, which is the thermal gel properties of HPMC. The solubility changes with the viscosity. The lower the viscosity, the greater the solubility. HPMC with different specifications have different performances. The dissolution of HPMC in water is not affected by pH

 

8. As the methoxy content decreases, the gel point will increase, the water solubility will decrease, and the surface activity will decrease.

 

9. HPMC also has the characteristics of thickening ability, salt discharge, low ash content, pH stability, water retention, dimensional stability, excellent film-forming properties, and extensive enzyme resistance, dispersibility and adhesion.

 

Application

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, it is used as thickener, stabilizer, emulsifier, excipient, water retaining agent, film forming in the production of other petrochemicals, building materials, paint removers, agricultural chemicals, inks, textile printing and dyeing, ceramics, papermaking, cosmetics and other products, etc.

In synthetic resins，it can make the obtained products with the characteristics of regular particles, looseness, suitable apparent specific gravity, and excellent processing performance, which basically replaces gelatin and polyvinyl alcohol as dispersants.

In building industry, it is mainly used for mechanized construction such as wall masonry, plastering, and caulking;

In special decorative construction, it is used for pasting tiles, marbles, and plastic decorations, which has high bonding strength and can reduce the amount of cement.

As a thickener in the coating industry, it can make the coating bright and delicate, without powdering, and improve the leveling performance.

In plastering plaster, pasting plaster, caulking plaster, water-resistant putty, it can significantly increase its water retention and adhesive strength.

It can also be used in functional ceramics, metallurgy, seed coating agents, water-based inks, cosmetics, electronics, printing and dyeing, papermaking and other fields

Dissolution Method

1. Take the required amount of hot water, put it in a container and heat it to above 80°C. Gradually add this product under slow stirring. The cellulose initially floats on the water surface, but it will  disperse to form a uniform slurry. Cool the solution while stirring.

2. Or heat 1/3 or 2/3  hot water to above 85°C, add HPMC to obtain a hot water slurry, then add the remained amount of cold water, keep stirring, and cool the resulting mixture to serve.

3. Cellulose particles is relatively fine, and it exists as a single small particle in the evenly stirred powder, and it dissolves quickly when it meets with water to form the required viscosity.

4. Add the cellulose slowly and evenly at room temperature, stirring continuously during the addition process until a transparent solution is formed.

 

Packaging, Storage and Transportation:

 

Packing: 25kg/bag.

 

Storage : Avoiding sun, rain and moisture during storage and transportation.

 

HPMC CAS 9004-65-3

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