1.(HPMC) Physical and chemical properties:
1. Appearance: MC is white or off-white fibrous or granular powder, odorless.
2. Properties: MC is almost insoluble in absolute ethanol, ether and acetone. Rapidly disperse and swell in hot water at 80~90°C, and dissolve quickly after cooling down. The aqueous solution is quite stable at room temperature, and can gel at high temperature, and the gel can change with the solution with the temperature. It has excellent wettability, dispersibility, adhesiveness, thickening, emulsification, water retention and film-forming properties, and impermeability to oil. 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 within the range of PH2-12.
3. Apparent density: 0.30-0.70g/cm³, density about 1.3g/cm³.
2. Dissolving method:
When MC products are directly added to water, they will coagulate and then dissolve, but the dissolution is very slow and difficult. There are three suggested dissolution methods below, and users can choose the most convenient method according to their usage:
1. Hot water method: Since MC does not dissolve in hot water, MC can be evenly dispersed in hot water at the initial stage, and then when it is cooled, two typical methods are described as follows:
1). Put the required amount of hot water into the container and heat it to about 70°C. MC was gradually added under slow stirring, initially MC floated on the surface of the water, and then gradually formed a slurry, which was cooled under stirring.
2). Add 1/3 or 2/3 of the required amount of water into the container, and heat it to 70°C. According to the method of 1), disperse MC to prepare hot water slurry; then add the remaining amount of cold water or ice water to a slurry of hot water, the mixture was cooled after stirring.
2. Powder mixing method: MC powder particles and an equal or greater amount of other powdery ingredients are fully dispersed by dry mixing, and then dissolved in water, then MC can be dissolved at this time without agglomeration.
3. Organic solvent wetting method: pre-disperse or wet MC with organic solvents, such as ethanol, ethylene glycol or oil, and then add water to dissolve, then MC can also be dissolved smoothly at this time.
3. Uses:
This product is widely used in building construction, building materials, dispersible coatings, wallpaper pastes, polymerization aids, paint removers, leather, inks, papermaking, etc. as thickeners, adhesives, water-retaining agents, film-forming agents, Excipients etc. For example, it is used as an adhesive, 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.
Methylcellulose (MC) physical and chemical properties:
1. Appearance: MC is white or off-white fibrous or granular powder, odorless.
2. Properties: MC is almost insoluble in absolute ethanol, ether and acetone. Rapidly disperses and swells in hot water at 80~90>℃, and dissolves rapidly after cooling down. The aqueous solution is quite stable at room temperature, and can gel at high temperature, and the gel can change with the solution with the temperature. It has excellent wettability, dispersibility, adhesiveness, thickening, emulsification, water retention and film-forming properties, and impermeability to oil. 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 within the range of PH2-12.
3. Apparent density: 0.30-0.70g/cm³, density about 1.3g/cm³.
4. Dissolving method:
MC> When the product is directly added to water, it will coagulate and then dissolve, but the dissolution is very slow and difficult. There are three suggested dissolution methods below, and users can choose the most convenient method according to their usage:
1. Hot water method: Since MC does not dissolve in hot water, MC can be evenly dispersed in hot water at the initial stage, and then when it is cooled, two typical methods are described as follows:
1). Put the required amount of hot water into the container and heat it to about 70°C. MC was gradually added under slow stirring, initially MC floated on the surface of the water, and then gradually formed a slurry, which was cooled under stirring.
2). Add 1/3 or 2/3 of the required amount of water into the container, and heat it to 70°C. According to the method of 1), disperse MC to prepare hot water slurry; then add the remaining amount of cold water or ice water to a slurry of hot water, the mixture was cooled after stirring.
2. Powder mixing method: MC powder particles and an equal or greater amount of other powdery ingredients are fully dispersed by dry mixing, and then dissolved in water, then MC can be dissolved at this time without agglomeration.
3. Organic solvent wetting method: pre-disperse or wet MC with organic solvents, such as ethanol, ethylene glycol or oil, and then add water to dissolve, then MC can also be dissolved smoothly at this time.
5. Uses:
This product is widely used in building construction, building materials, dispersible coatings, wallpaper pastes, polymerization aids, paint removers, leather, inks, papermaking, etc. as thickeners, adhesives, water-retaining agents, film-forming agents, Excipients etc. For example, it is used as an adhesive, 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.
Post time: Apr-24-2023