11. What is the gel temperature of hydroxypropyl methylcellulose related to?
——Answer: The gel temperature of HPMC is related to its methoxy content. The lower the methoxy content↓, the higher the gel temperature↑.
12. Is there any relationship between the drop of putty powder and HPMC?
——Answer: The powder loss of putty powder is mainly related to the quality of ash calcium, and has little to do with HPMC. The low calcium content of gray calcium and the improper ratio of CaO and Ca(OH)2 in gray calcium will cause powder loss. If it has something to do with HPMC, then if HPMC has poor water retention, it will also cause powder loss. For specific reasons, please refer to question 9.
13. What is the difference between the cold-water instant type and the hot-soluble type of hydroxypropyl methylcellulose in the production process?
——Answer: The cold water instant type of HPMC is surface-treated with glyoxal. It disperses quickly in cold water, but it does not really dissolve. It only dissolves when the viscosity increases. Hot melt types are not surface treated with glyoxal. If the amount of glyoxal is large, the dispersion will be fast, but the viscosity will increase slowly, and if the amount is small, the opposite will be true.
14. What is the smell of hydroxypropyl methylcellulose (HPMC)?
——Answer: The HPMC produced by the solvent method uses toluene and isopropanol as solvents. If the washing is not very good, there will be some residual smell.
15. How to choose a suitable hydroxypropyl methylcellulose (HPMC) for different purposes?
——Answer: The application of putty powder: the requirements are relatively low, and the viscosity is 100,000, which is enough. The important thing is to keep water well. Application of mortar: higher requirements, high viscosity, 150,000 is better. Application of glue: instant products with high viscosity are required.
16. What is the alias of hydroxypropyl methylcellulose?
——Answer: Hydroxypropyl Methyl Cellulose, English: Hydroxypropyl Methyl Cellulose Abbreviation: HPMC or MHPC Alias: Hypromellose; Cellulose Hydroxypropyl Methyl Ether; Hypromellose, Cellulose, 2-hydroxypropylmethyl Cellulose ether. Cellulose hydroxypropyl methyl ether Hyprolose.
17. The application of HPMC in putty powder, what is the reason for the bubbles in the putty powder?
——Answer: In the putty powder, HPMC plays three roles of thickening, water retention and construction. Do not participate in any reactions. Reasons for bubbles: 1. Put too much water. 2. The bottom layer is not dry, just scrape another layer on top, and it is easy to foam.
18. What is the formula of putty powder for interior and exterior walls?
——Answer: Putty powder for interior walls: heavy calcium 800KG gray calcium 150KG (starch ether, pure green, pentagentite, citric acid, polyacrylamide, etc. can be added appropriately)
External wall putty powder: cement 350KG heavy calcium 500KG quartz sand 150KG latex powder 8-12KG cellulose ether 3KG starch ether 0.5KG wood fiber 2KG
Post time: Mar-21-2023