Common issues of wall putty powder duringthe construction porcess

Analysis of the problem during the construction process of putty powder

Problem 1: Large area cracking after drying

Reason is The Putty quality is so poor.

Solution:Increase the dosage of polyvinyl alcohol powder in the putty powder, and the initial dry cracking resistance of the putty powder film is mainly provided by the organic rubber binder. In addition, the fineness of the filler should not be too high, and the high-fineness filler requires more binder to bond and cause greater drying shrinkage.

Problem 2: After a batch of scraping, the coating is not applied in time, and the putty powder film is slightly cracked.

Reason is The putty powder film is dry, and the cement cannot be fully hydrated to increase strength, volume shrinkage, and the bonding strength of the base layer is low, and the volume shrinkage stress cannot be overcome.

Solution: Paint should be applied in time after the putty powder is scraped.

Problem 3: The same wall is scraped, some places are cracked, and some areas are not cracked.

Reason is The putty powder is applied too thickly or the batch is unevenly coated.

Solution:Should pay attention to uniform coating to keep the thickness of the putty powder film even.

Problem 4:Poor water resistance, filming drums after rain erosion.

Reason is The content of inorganic binder in the putty powder component is low;

Solution:The dosage of cement should not be too low. When using 32.5 grade cement, the proportion of cement should not be lower than 45%; when using grade 42.5 cement, the proportion of cement should not be less than 30%, the quality of cement is poor, or the purity of ash calcium powder is not high. High white powder, using cement or ash calcium powder produced by brand or big factory.

Problem 5:Rough, not smooth.

Reason is The filler particle size is too coarse.

Solution:The fineness of the filler should be appropriate, generally controlled at about 250~300 mesh. If the water retaining agent is used improperly, the carboxymethyl cellulose ether with good water retention property should be selected as the water retaining agent.

Problem 6:Powdered off.

Reason is There is too little organic rubber in the putty powder.

Solution:Increase the dosage of polyvinyl alcohol powder, the amount of water-retaining agent in the putty powder is too small, the cement-based putty powder, the water-retaining agent content is too low, the cement hydration is insufficient, Increase the dosage of water-retaining agent like Cellulose Ether HPMC.

Problem 7: Poor grinding ability.

Reason is The putty powder composition is improper.

Solution:Reducing the dosage of polyvinyl alcohol powder, the grinding time is not well mastered, it should be polished in the time when the putty powder is scraped, the surface is dry and the surface is not completely dry.

Problem 8:Drying time is too long.

Reason is The dosage of water retaining agent and retarder is too large.

Solution:Reduce the dosage of water retention agent. For gypsum-based putty powder, the dosage of retarder is too high, reduce its dosage, and the water consumption when mixing the putty powder is too large, and gradually add water to the appropriate consistency.

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