The difference between hydroxypropyl methyl cellulose and methyl cellulose

The difference between hydroxypropyl methyl cellulose and methyl cellulose

(HPMC) Physical and chemical properties:
1. Appearance: MC is white or almost white fibrous or granular powder, odorless.
2. Properties: MC is almost insoluble in absolute ethanol, ether and acetone. It disperses and swells quickly in hot water at 80~90℃, and dissolves quickly after cooling. The aqueous solution is quite stable at normal temperature, and can gel at high temperature, and the gel can change with the solution with the temperature. It has excellent wettability, dispersibility, adhesion, thickening, emulsification, water retention and film-forming properties, as well as impermeability to grease. The formed film has excellent toughness, flexibility and transparency. Because it is non-ionic, it can be compatible with other emulsifiers, but it is easy to salt out and the solution is stable in the range of PH2-12.
3. Apparent density: 0.30-0.70g/cm3, density is about 1.3g/cm3.
2. Dissolution method:
The MC product is directly added to the water, it will agglomerate and then dissolve, but this dissolution is very slow and difficult. The following three dissolution methods are suggested, and the user can choose the most convenient method according to the use situation:
1. Hot water method: Since MC does not dissolve in hot water, MC can be evenly dispersed in hot water at the initial stage. When it is subsequently cooled, two typical methods are described as follows:
1). Put the required amount of hot water in the container and heat it to about 70°C. Gradually add MC under slow agitation, start to float on the surface of the water, and then gradually form a slurry, and cool the slurry under agitation.
2). Add 1/3 or 2/3 of the required amount of water into the container and heat it to 70°C. Follow the method in 1) to disperse MC to prepare a hot water slurry; then add the remaining amount of cold water or ice water Into the hot water slurry, cool the mixture after stirring.
2. Powder mixing method: Mix MC powder particles with an equal or larger amount of other powdered ingredients to fully disperse them by dry mixing, and then add water to dissolve, then MC can be dissolved without agglomeration.
3. Organic solvent wetting method: pre-disperse or moisten MC with an organic solvent, such as ethanol, ethylene glycol or oil, and then add water to dissolve, then MC can also be dissolved smoothly.
3. Purpose:
This product is widely used in building construction, building materials, dispersive coatings, wallpaper pastes, polymerization additives, paint removers, leather, ink, paper, etc. as thickeners, adhesives, water-retaining agents, film-forming agents, Excipients, etc. For example, it is used as a binder, thickener and water-retaining agent in building materials, as a film-forming agent and thickener in the coating industry, and is also widely used in petroleum drilling and daily chemical industries.
The physical and chemical properties of methyl cellulose (MC):

1. Appearance: MC is white or almost white fibrous or granular powder, odorless.

Properties: MC is almost insoluble in absolute ethanol, ether and acetone. It disperses and swells rapidly in hot water of 80~90>℃, and dissolves quickly after cooling. The aqueous solution is quite stable at normal temperature and can gel at high temperature, and the gel can change with the solution with the temperature. It has excellent wettability, dispersibility, adhesion, thickening, emulsification, water retention and film-forming properties, as well as impermeability to grease. The formed film has excellent toughness, flexibility and transparency. Because it is non-ionic, it can be compatible with other emulsifiers, but it is easy to salt out and the solution is stable in the range of PH2-12.

3. Apparent density: 0.30-0.70g/cm3, density is about 1.3g/cm3.

4. Dissolution method:
MC> The product is directly added to water, it will agglomerate and then dissolve, but this dissolution is very slow and difficult. The following three dissolution methods are suggested, and the user can choose the most convenient method according to the use situation:

1. Hot water method: Since MC does not dissolve in hot water, MC can be evenly dispersed in hot water at the initial stage. When it is subsequently cooled, two typical methods are described as follows:

1). Put the required amount of hot water in the container and heat it to about 70°C. Gradually add MC under slow agitation, start to float on the surface of the water, and then gradually form a slurry, and cool the slurry under agitation.

2). Add 1/3 or 2/3 of the required amount of water into the container and heat it to 70°C. Follow the method in 1) to disperse MC to prepare a hot water slurry; then add the remaining amount of cold water or ice water Into the hot water slurry, cool the mixture after stirring.

Powder mixing method: dry mixing MC powder particles with equal or larger amounts of other powdered ingredients to fully disperse them, and then add water to dissolve them, then MC can be dissolved without agglomeration.

3. Organic solvent wetting method: disperse or moisten MC with an organic solvent, such as ethanol, ethylene glycol or oil, and then add water to dissolve it, then MC can also be dissolved smoothly.

5. Purpose:
This product is widely used in building construction, building materials, dispersive coatings, wallpaper pastes, polymerization additives, paint removers, leather, ink, paper, etc. as thickeners, adhesives, water-retaining agents, film-forming agents, Excipients, etc. For example, it is used as a binder, thickener and water-retaining agent in building materials, as a film-forming agent and thickener in the coating industry, and it is also widely used in fields such as petroleum drilling and daily chemical industry.

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