Application and problem analysis of hydroxypropyl methylcellulose in putty!

Powdering: Lack of gel material, insufficient water retention of cellulose, low calcium content of heavy calcium. Construction performance: Improved through bentonite and starch ether. Hollowing and insufficient adhesion to the wall are caused. Layering: Interface treatment can be done. Strength: Can also be adjusted through calcium powder grading.

 

Neutral putty:

Powdering: Insufficient adhesive materials, insufficient water retention of cellulose, low calcium content in heavy calcium.

Construction performance: Improved through the use of bentonite and starch ether.

Hollowing and inadequate adhesion to the wall: Caused by inadequate bonding strength.

Layering: Perform interface treatment.

Strength: Can also be adjusted through calcium powder grading.

Gray Calcium-Based Putty:

Issues include hollowing, powder shedding and yellowing, poor workability, powder shedding, layering, cracking, and post-thickening.

Powder falling off: Insufficient amount of gelatinous material, insufficient water retention of cellulose or insufficient amount of addition, impure hydrated lime.

Improve construction performance: Use bentonite and starch ether.

Hollowing; and inadequate adhesive strength of wall caused by appropriate addition of latex powder.

Layering: Interface treatment.

Yellowing: Improper selection of cellulose.

Cracking: Cracking of the base layer or excessive hard cracking, too thick coating.

Thickening afterwards: The water absorption rate of heavy calcium is different. It is recommended to use zero absorption or extremely low water absorption heavy calcium powder. The hydrated lime contains poorly digested GaO.

Cement-based putty:

Issues such as powdering, poor workability, delamination, cracking, insufficient water resistance, and false setting may occur.

Powdering may be caused by insufficient cementitious materials, inadequate cellulose water retention, or insufficient dosage.

Poor workability can be improved by adding bentonite and starch ether. Insufficient adhesive strength may result in hollowing.

In this case, reasonable addition of latex powder can help.

Delamination can be solved by interfacial treatment.

Yellowing may be caused by inappropriate cellulose selection.

Insufficient water resistance may result from insufficient latex powder or cementitious materials.

Cracking may be caused by base cracking, excessive strength, excessive coating thickness, or the use of putty to fill holes. False setting can be addressed by adding sodium gluconate to extend the working time.