1. cellulose ether – cellulose ether predecessor

Cellulose ether is the most abundant polysaccharide in the world today. The main sources of natural cellulose are cotton, trees, aquatic plants, grass and so on. Cotton contains 92-95% cellulose; Flax contains about 80% cellulose; Wood contains about 50% cellulose.

2, cellulose ether structure

Cellulose ether is a complex polysaccharide containing thousands of glucose units in the molecule, chemical formula is (C6H10O5) N. The D- glucose group is bound by β – 1,4 glucoside bonds.

Common problems and main causes of water resistance putty on inner wall

Common problem solving methods

Neutral putty:

Depowder: insufficient cementitious material, cellulose ether water retention is not enough, calcium content of heavy calcium is low.

Construction performance: improved by bentonite and starch ether.

Empty drum; And wall adhesion caused by inadequate.

Layering: interface processing.

Strength: Can also be adjusted by grading calcium powder.

Lime calcium putty:

The problems are empty drum, depowder yellowing, construction is not good, depowder, stratification, cracking, after thickening;

Depowder: insufficient cementitious material, insufficient cellulose water retention or insufficient amount of addition, lime calcium is not pure.

Poor construction performance: bentonite and starch ether to improve.

Empty drum; And insufficient wall adhesion caused by the appropriate addition of latex powder.

Layering: interface processing.

Yellowing: improper selection of cellulose ether.

Cracking: base cracking or too hard cracking strength, coating too thick.

After thickening: heavy calcium water absorption rate is different, it is recommended to choose zero water absorption or very low heavy calcium powder; Gray calcium contains undigested GaO.

Cement-based putty:

Problems for empty drum, construction is not good, depowder, delamination, cracking, insufficient water resistance, false coagulation;

Depowder: insufficient cementitious material, insufficient cellulose ether water retention or insufficient amount of addition.

Poor construction performance: bentonite and starch ether to improve.

Empty drum: and wall adhesion caused by insufficient, reasonable addition of latex powder.

Layering: interface processing.

Yellowing: Improper cellulose selection.

Insufficient water resistance: insufficient latex powder and insufficient cementitious materials.

Cracking: base cracking or too high strength cracking, coating is too thick, with putty to fill the hole.

False coagulation: sodium gluconate can be added to prolong the operational time.