Interior wall putty powder, tile adhesives, grouting agents, adhesive cement mortars, high-strength grouting materials, etc. can all use hydroxypropyl methylcellulose (HPMC) with a viscosity of 100,000.

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The standard of vitrified microbead insulation mortar is higher, 150,000 viscosity hydroxypropyl cellulose or 200,000 viscosity hydroxypropyl cellulose. If you choose 100,000 viscosity hydroxypropyl cellulose, it will easily cause sagging. .

The most important function of cellulose is to retain water, followed by thickening. In interior wall putty powder, as long as it has good water-retention and low viscosity (70,000-80,000), it is also possible. When the viscosity exceeds 100,000, the viscosity has little effect on water retention. It is not necessary to produce interior wall putty powder. Choose a viscosity of 200,000, because if the viscosity is too high, it will be difficult to scrape and the scraper will sink.

Application of 100,000 viscosity HPMC

1. Engineering construction cement mortar plastering mortar

High water solubility allows the concrete to fully solidify and continuously increase the bonding strength. At the same time, it can appropriately increase the tensile strength and cutting strength, thus improving the construction effect and improving work efficiency.

2. Water-resistant putty powder

In the putty powder, it plays an important role in locking water, bonding and lubrication, avoiding cracks and dehydration caused by too fast water shortage. It also improves the adhesion of the putty powder, reduces the sagging phenomenon during construction, and the construction is relatively silky. slip.

3. Plaster plaster series

In the gypsum product series, it plays an important role in water retention, thickening, and lubrication. It also has a certain retarding effect, which solves the problem of drum cracking and insufficient original strength during the construction operation process, and can extend the construction time.

4. Waterproof putty

Mainly used as an emulsifier, it can increase the compressive strength and cutting strength, improve the surface coating, and increase the adhesion and bonding strength.

5. Ceramic tile adhesive

The high water solubility eliminates the need to wet or moisten the floor tiles and base in advance, significantly improving their bonding strength. The slurry can be constructed for a long time, is fine and uniform, is easy to construct, and has good wettability.

6. Pointing agent, groove agent

The addition of HPMC cellulose gives it excellent bonding strength, low shrinkage and high wear resistance, protecting the base material from mechanical damage and avoiding the impact of penetration on the entire building.

7. DC leveling material

Smooth adhesion ensures high-quality fluidity and cement self-leveling capabilities, and the water locking rate is adjusted to enable rapid condensation and reduce cracking and shrinking.

8. Wall paint and architectural coatings

In the architectural coating manufacturing industry, hydroxypropyl methylcellulose can be used as a film-forming agent, emulsifier, demulsifier and thickener to make the film have better wear resistance, leveling, adhesion and improvement The pH of the interfacial tension is used to determine the interfacial tension, and the miscibility effect with solvents is also good. The high water locking characteristics make it have good brushability and flatness.

Application of 150,000 viscosity HPMC

The viscosity of 150,000 is close to the viscosity of 100,000 and the viscosity of 200,000. It is suitable for both the viscosity of 100,000 and the viscosity of 200,000.

Application of 200,000 viscosity HPMC

In the application of building decoration materials, especially inorganic thermal insulation mortar, the most important thing is to focus on bonding to increase the strength, making the cement mortar easier to apply, improving work efficiency, and at the same time having anti-sag effect, which is relatively High water-locking properties can extend the working time of cement mortar, improve shrinkage and cracking resistance, improve surface quality, and enhance adhesion.

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1. HPMC Solubility in Water

HPMC is the same as hypromellose and is a water-soluble cellulose ether. HPMC dissolves in cold water and certain polar organic solvent, such as methanol, ethanol, isopropyl alcohol (IPA), and acetone. HPMC can also be dissolved in water-organic solvents and mixed solvents. But is not soluble in hot water.

2. Dissolving HPMC: Methods and Considerations

Various methods can be employed to dissolve Hydroxypropyl MethylCellulose (HPMC), including hot water solubility, the dry powder mixing method, and the organic solvent wetting method.

2.1 Solubility of HPMC in Hot Water

HPMC is not readily soluble in hot water; therefore, it is necessary to cool the HPMC hot solution to an appropriate temperature. Only under these conditions can HPMC dissolve and effectively enhance viscosity. There are three recommended approaches:

a. Pour the necessary amount of hot water into the container and heat it to approximately 70°C. Slowly stir the heated water and add HPMC to it. Initially, the HPMC powder may float on the water surface, gradually forming a slurry through continuous stirring. Continue stirring until the slurry cools to an appropriate temperature, at which point HPMC becomes water-soluble, and the solution gains viscosity.

b. Pour either 1/3 or 2/3 of the required hot water amount into the container and heat it to around 70°C. Add HPMC to the heated water, stirring slowly to ensure even dispersion and thorough wetting of the HPMC powder. Create a hot water slurry. Then, add the remaining amount of cold water to the hot slurry, cooling the mixture while maintaining continuous stirring.

2. Place either 1/3 or 2/3 of the needed hot water into the container and heat it to approximately 70°C. Slowly stir the heated water to disperse and wet the HPMC powder thoroughly. Create a hot water slurry. Add the remaining amount of cold water or ice water to the container. Introduce the HPMC hot water slurry to the cold water and stir continuously. Finally, allow the solution to cool down.

2.2 Dry Powder Mixing Method

The dry powder mixing method involves blending HPMC molecules with other dry powders in a mixer. The recommended ratio of dry powder to HPMC is typically 3:1 or 7:1. During stirring, water is gradually added, and the process continues until the mixture is fully hydrated.

At this stage, HPMC does not condense because its molecular powder is dispersed in every tiny corner, ensuring uniform distribution. As a result, this mixture readily dissolves upon contact with water.

Non-surfaced HPMC is commonly utilized in applications like wall putty and mortar, typically available in powder form. In the construction of dry mortar or wall putty, workers often prefer the dry powder mixing method over hot water methods.

2.3 Organic Solvent Wetting Method

Using an organic solvent to disperse or wet HPMC. Then add water. At this moment, HPMC is easy to dissolve.

3. HPMC Solubility in Cold Water

HPMC solubility in water has two types: surface-treated HPMC and non-surfaced treated HPMC.

3.1 Solubility of Surface-Treated HPMC in Cold Water

When surface-treated HPMC is added to cold water, it disperses into the water without exhibiting any viscosity. After stirring and waiting for approximately 2 minutes, the solution thickens and becomes viscous. This is attributed to the presence of a crosslinking agent on the surface of instant HPMC. Commonly, Glyoxal is employed as a crosslinking agent, aiding the dispersion in cold water initially. As a result, surface-treated HPMC tends to be more expensive than its non-surface-treated counterpart.

3.2 Solubility of Non-Surface-Treated HPMC in Cold Water

Hot melt products may condense upon contact with cold water due to the outer layer of non-surface-treated HPMC reacting with the cold water. This reaction leads to the solution becoming viscous and thickening. The HPMC powder becomes enveloped in a transparent gel, with only the outer layer dissolving. This process significantly slows down the dissolution rate of HPMC inside. Generally, non-surface-treated HPMC is dissolved more efficiently by dissolving in hot water.

4. Solubility of HPMC in Organic Solvents

Hydroxypropyl MethylCellulose (HPMC) can only be dissolved in organic solvents if they are polar and contain a higher percentage. This solubility is independent of whether the organic solvents have water. Compared to alternative substitutes, HPMC exhibits superior solubility in organic solvents. This section details the solubility of HPMC in specific organic solvents, such as IPA (isopropyl alcohol) or ethanol.

4.1 Solubility of HPMC in Ethanol or Isopropyl Alcohol

- Is HPMC soluble in IPA? Yes, it is.

- Is HPMC soluble in ethanol? Yes, it is, but insoluble in anhydrous ethanol. HPMC demonstrates good solubility in higher concentrations of ethanol or isopropyl alcohol.

Hand sanitizer gel typically comprises less than 40% water and more than 60% alcohol, which is used to prevent diseases and eliminate bacteria. HPMC is utilized in hand sanitizer formulations as a detergent thickener to increase viscosity.

Dissolution Method of Hydroxypropyl MethylCellulose in Water/Alcohol Mixture:

1. Place ethanol or isopropanol in a container. Slowly add HPMC powder or another detergent thickener while stirring with a mixer.

2. Continue stirring until a homogeneous suspension is achieved.

3. Slowly add cold water to facilitate dissolution.