Application and problem analysis of hydroxypropyl methyl cellulose in putty!
Neutral putty:
De-powder: insufficient cementitious materials, insufficient water retention of cellulose, low calcium content of heavy calcium
Construction performance: improved by bentonite and starch ether
Empty drum; Due to insufficient adhesion with the wall
Layering: interface processing
Strength: can also be adjusted by calcium powder grading
Grey calcium base putty:
The problems are hollowing, yellowing after powder removal, poor workability, powder removal, delamination, cracking, and post-thickening
De-powder: insufficient cementitious materials, insufficient water retention of cellulose or insufficient addition, impure gray calcium
Poor construction performance: improved by bentonite and starch ether
Empty drum; Inadequate adhesion with the wall results in proper addition of latex powder
Layering: interface processing
Yellowing: improper selection of cellulose
Cracking: base cracking or too high strength, hard cracking, coating too thick
Post-thickening: Due to the different water absorption of heavy calcium, it is recommended to select heavy calcium powder with zero water absorption or extremely low water absorption; Grey calcium contains undigested GaO.
Cement-based putty:
The problems are hollowing, poor constructability, powder removal, delamination, cracking, insufficient water resistance, false condensation
De-powder: insufficient cementitious materials, insufficient water retention of cellulose or insufficient addition
Poor construction performance: improved by bentonite and starch ether
Empty drum; Due to insufficient adhesion with the wall, latex powder shall be reasonably added
Layering: interface processing
Yellowing: improper selection of cellulose
Insufficient water resistance: insufficient latex powder and insufficient cementing materials
Cracking: base cracking or too high strength, hard cracking, coating too thick, filling holes with putty
Pseudocoagulation: sodium gluconate can be added to extend the operational time
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