Common problems and solutions in the use of interior wall putty powder


Release time:

2020-07-10

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Common problems and solutions in the use of interior wall putty powder
1. Problems often occur in putty powder:
 
1.1 dry fast. This is mainly the amount of ash calcium powder (too large, can be appropriate to reduce the amount of ash calcium powder in the putty formula) and the water retention rate of the fiber, but also related to the dryness of the wall.
1.2 peel and roll. This is related to the water retention rate, and the low viscosity of cellulose is prone to this situation or the amount of addition is small.
1.3 interior wall putty powder off. This is related to the dosage of gray calcium powder (the dosage of gray calcium powder in putty formula is too small or the purity of gray calcium powder is too low, and the dosage of gray calcium powder in putty powder formula is appropriately increased), and it is also related to the dosage and quality of cellulose, which is reflected in the water retention rate of the product, low water retention rate and gray calciumPowder (calcium oxide in gray calcium powder is not fully converted to calcium hydroxide hydration) time is not enough, caused.
1.4 blisters. This is related to the dry humidity and flatness of the wall, and it is also related to the construction.
1.5 needle points appear. This is related to cellulose, which has poor film-forming properties. At the same time, impurities in cellulose and calcium ash have a slight reaction. If the reaction is severe, putty powder will show a state of bean curd residue. Can not be on the wall, at the same time there is no cohesive force, in addition to cellulose mixed with a class of carboxygabyl products also appear thiskind of situation.
Volcanic holes and pinholes 1.6 appear. This is clearly related to the water surface tension of the aqueous solution of hydroxypropyl methyl cellulose. The water surface tension of the hydroxyethyl aqueous solution is not obvious. It will be good to receive light treatment.
1.7 putty is easy to crack and yellow after drying. This is related to the addition of gray calcium powder. The addition of gray calcium powder increases the hardness of putty powder after drying. Only hardness without flexibility is easy to crack, especially when subjected to external force. It is also related to the high content of calcium oxide in gray calcium powder, which is preceded by a medium.Shao's.
 
Why does putty powder become thinner and thinner after adding water?
 
Cellulose as a thickening agent in greasy on the application, due to the thixotropy of cellulose itself, putty powder in the addition of cellulose also led to the putty water produced thixotropy. This thixotropy is caused by the destruction of the loosely bonded structure of the components in the putty powder. This structure is produced at rest.born, unraveled under stress. That is, the viscosity decreases under stirring and the viscosity recovers at rest.
 
What is the reason why putty is heavy in the process of batch scraping
 
In this case, the viscosity of cellulose generally used is too high, and some manufacturers use 200000 putty. The putty made in this way has a heavy feeling due to its high viscosity. The recommended amount of interior wall putty is 3-5kg, and the viscosity is 8-100000.
 
Why do putty and mortar made of cellulose with the same viscosity in winter and summer feel different in viscosity
 
Due to the thermal gelation of the product, the viscosity of the product will gradually decrease with the increase of temperature. When the temperature exceeds the gel temperature of the product, the product will precipitate from the water and lose its viscosity. The room temperature in summer is generally above 30 degrees, which is much different from the temperature in winter, so I feel the viscosity.To be low. It is suggested that in summer, products with high viscosity should be selected as far as possible, or the dosage of cellulose should be increased. In addition, products with high gel temperature should be selected, and MK brand products should be selected as far as possible. The gel temperature of this product is generally above 70 degrees. Try not to use methyl in summerCellulose, its gel temperature is about 55 degrees, the temperature is slightly higher, its viscosity will be greatly affected.

Key words:

Putty powder