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. How do you dissolve HPMC?
HPMC solubility ways include hot water solubility, dry powder mixing method, and organic solvent wetting method.
2.1 HPMC solubility in hot water
Because HPMC is not soluble in hot water, we need to cool the HPMC hot solution to a proper temperature. Only in this way, HPMC can be soluble and play the function of increasing viscosity. There are 3 ways in the following.
1. Pour the required amount of hot water into the container. Heat it until about 70&#;. Then stir it slowly. and add HPMC to it. In the beginning, HPMC powder floated on the water solution surface. Gradually forming a slurry through stirring. Stir until the slurry is cool. If the temperature is down to a proper degree, the HPMC becomes water solubility. The HPMC solution begins to have viscosity.
2. Pour 1/3 or 2/3 of the required amount of hot water into the container. Heat it until about 70&#;. Then add HPMC. Then stir it slowly to make HPMC powder evenly disperse and thoroughly wet. hot water slurry is prepared. Then add the remaining amount of cold water to the hot slurry and cool the mixture while stirring. Then continue to stir.
3. Put 1/3 or 2/3 of the required amount of hot water into the container. Heat it to about. 70°C. Then stir it slowly to make HPMC powder evenly disperse and thoroughly wet. hydroxypropyl methylcellulose is dispersed. Hot water slurry is prepared. Then add the remaining amount of cold water or ice water to the container. Add HPMC hot water slurry to the cold water, and stir, At last cool down this solution.
2.2 Dry powder mixing method
There is a mixing process between HPMC molecular and other dry powders in a blender. The suggested ratio of dry powder to HPMC is 3:1 or 7:1. Then when stir, add water. Continue to stir until the mixture has completely hydrated.
At this moment, HPMC will not condense. Because HPMC powder molecular is dispersed in every tiny corner. Every corner has little. Therefore, this mixture can be dissolved immediately when meets water.
Non-surfaced HPMC often applies to wall putty and mortar. And this material usually is powder. So in the construction of dry mortar or wall putty, workers would like to use dry powder mixing method rather than use 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 surface treated HPMC solubility in cold water
When adding surface-treated HPMC into the water, HPMC will disperse into the cold water. But don&#;t have any viscosity. It is just dispersed. stir it and wait around 2 minutes, the solution becomes thick and viscous.
This is because instant HPMC&#;s surface has a kind of crosslinking agent. Most HPMC manufacturers like using Glyoxal as a crosslinking agent. This agent helps HPMC to disperse in cold water rather than dissolve at the beginning. So the price of surface treated HPMC is high than nor surface-treated HPMC.
3.2 Non-surface treated HPMC solubility in cold water
Hot melt products may condense when in contact with cold water. This is because the outer layer of non-surfaced treated HPMC reacted with cold water. This reaction makes the solution becomes viscous and thicken. The HPMC powder is wrapped in this transparent gel. Only the outer layer is dissolved. The dissolution rate of HPMC inside will be greatly slowed down.
Generally, it will be dissolved by dissolving in hot water.
4.HPMC solubility in organic solvents
Only in the case of polar organic solvents containing a higher percentage, HPMC can be dissolved in an organic solvent. This solubility doesn&#;t consider whether organic solvents have water. Compare to other substitutes, HPMC has a higher solubility in organic solvents. This is an HPMC solubility in organic solvents in detail. For example, HPMC solubility in IPA or ethanol.
4.1 HPMC solubility in ethanol or isopropyl alcohol
Is HPMC soluble in IPA?
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Yes, it is
Is HPMC soluble in ethanol?
Yes, it is. But insoluble in anhydrous ethanol. HPMC exhibits good solubility in higher concentrations of ethanol or isopropyl alcohol.
Hand sanitizer gel generally consists of less than 40% water and more than 60% alcohol. Alcohol used to prevent diseases and eliminate bacteria. Hand sanitizer formulations use HPMC as a detergent thickener to increase viscosity.
Dissolution method of hydroxypropyl methylcellulose in water/alcohol mixture
1. Put 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 observed
3. Slowly add cold water to dissolve
Choosing the right cellulose HPMC (hydroxypropyl methylcellulose) for putty powder is crucial for achieving desired performance and quality. Here are some key factors to consider when selecting suitable cellulose HPMC for putty powder:
Viscosity is an important characteristic that determines the workability and application properties of the putty. Different viscosity grades of cellulose HPMC are available, ranging from low viscosity to high viscosity. The choice of viscosity grade depends on the desired consistency, sag resistance, and ease of application required for the specific putty formulation.
HPMC for Inside and Outside Wall Putty in Industrial Grade
Water retention is a critical property of cellulose HPMC in putty powder. It affects the workability, open time, and drying characteristics of the putty. Optimal water retention ensures that the putty maintains a suitable consistency during application and curing. Consider the desired water retention level based on the environmental conditions and drying time required for the putty.
The setting time of putty powder is influenced by the cellulose HPMC used. The setting time refers to the time it takes for the putty to harden after application. Depending on the application requirements, choose cellulose HPMC that provides the desired setting time, whether it needs to set quickly for faster project completion or requires a longer setting time for extended workability.
HPMC for Wall Putty
Good adhesion and bonding strength are essential for putty powder to adhere well to different substrates and provide a durable finish. Consider the bonding strength requirements for your specific application and select cellulose HPMC that offers the necessary adhesive properties. It is advisable to consult with the supplier or manufacturer to determine the bonding strength of their cellulose HPMC products.
Thixotropic properties of cellulose HPMC play a role in the ease of mixing and application of putty powder. Thixotropic cellulose HPMC becomes less viscous under shear stress, making it easier to mix and spread smoothly. This property ensures improved workability, reduces air entrapment, and allows for a more even application of the putty.
Application of HPMC
Putty powders often contain various fillers and additives to enhance specific properties. It is important to select cellulose HPMC that is compatible with the fillers and additives used in the formulation. Incompatibility can lead to poor dispersion, decreased performance, or undesirable interactions. Consult with the supplier or manufacturer to ensure compatibility with the specific fillers and additives you intend to use.
Ensure that the cellulose HPMC you choose for putty powder is of high quality and purity. Look for products that meet industry standards and certifications. Check for consistent quality, reliable sourcing, and manufacturing processes that adhere to quality control measures. Reliable suppliers often provide product specifications and technical data sheets to help assess the quality and suitability of their cellulose HPMC products.
Consider the level of technical support and expertise offered by the cellulose HPMC supplier or manufacturer. They should be able to provide guidance on product selection, formulation optimization, and troubleshooting. Reliable suppliers often have technical teams that can assist in choosing the most suitable cellulose HPMC for your specific putty powder application.
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Choosing the right cellulose HPMC for putty powder involves considering factors such as viscosity grade, water retention, setting time, adhesion properties, thixotropic behavior, compatibility with fillers, quality, and technical support. By evaluating these factors and consulting with reputable suppliers, you can select suitable cellulose HPMC that meets your putty powder requirements and ensures optimal performance.
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