How to choose suitable hydroxypropyl methylcellulose for ...
How to choose the right HPMC
SLEO Chemical has a variety of products and detailed information that may assist you in making an informed choice.
1. Selecting by Model: Different formulations of wall putties require different viscosity levels of hydroxypropyl methylcellulose (HPMC) and methylcellulose. These can range from 40,000 to 100,000 in viscosity. Additionally, it's important to note that cellulose ether cannot simply replace other types of binders. The inclusion of cellulose ether should not imply a reduction in the quantity of other binder ingredients; each plays a unique role in the formulation.
2. The Importance of Cold Water Dispersible Cellulose Ether: Cellulose ethers, including hydroxypropyl methylcellulose and methylcellulose, act as surfactants with significant viscosity after dissolving. When ordinary cellulose ethers are added to water, they often clump together, creating a ball that forms a thick outer solution while the core remains undesolved, leading to ineffective mixing. In contrast, surface-treated cellulose ethers, designed to delay dissolution, disperse effectively in cold water, allowing for gradual dissolution and avoiding clumping. Understanding these distinctions is crucial when making your selection.
For dry-mixed interior and exterior wall putty, it is advisable to use the common type of cellulose ether (non-cold water dispersible type). During the dry-mixing process, the cellulose ether is thoroughly distributed throughout the mixture, preventing clumping. Since the common type dissolves faster than the cold water dispersion type, it can significantly reduce the waiting time between mixing the slurry and starting construction.
For applications requiring putty that involves direct dissolution of cellulose ether in water and subsequent mixing with other materials, the cold water dispersible type of cellulose ether is the recommended choice. This allows for efficient dispersion and controlled dissolution.
For more information about Hydroxypropyl Methylcellulose For Wall Putty, please feel free to reach out. Our expert team is ready to provide you with professional guidance.
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