1. Common problems in putty powder
Dries fast:
The main reason is that the amount of ash calcium powder added (too large, the amount of ash calcium powder used in the putty formula can be appropriately reduced) is related to the water retention rate of the fiber, and is also related to the dryness of the wall.
Peeling and rolling:
It 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.
De-powdering of interior wall putty powder:
The amount of ash calcium powder added (the amount of ash calcium powder in the putty formula is too small or the purity of the ash calcium powder is too low, and the amount of ash calcium powder in the putty powder formula should be increased appropriately), and it is also related to the amount of cellulose and The quality is related, which is reflected in the water retention rate of the product. The water retention rate is low, and the ash calcium powder (the calcium oxide in the ash calcium powder is not fully converted to calcium hydroxide for hydration) is not enough time, which is caused.
Foaming:
The dry humidity of the wall is related to the flatness, and it is also related to the construction.
A pinpoint appears:
It is related to cellulose, its film-forming property is poor, and at the same time, the impurities in cellulose react slightly with ash calcium. If the reaction is severe, the putty powder will appear in the state of bean curd residue. It can’t be put on the wall, and it has no cohesive force at the same time. In addition, this situation also occurs with products such as carboxymethyl mixed with cellulose.
After the putty dries, it is easy to crack and turn yellow:
It is related to the addition of a large amount of ash-calcium powder. If the amount of ash-calcium powder is added too much, the hardness of the putty powder will increase after drying. If the putty powder has no flexibility, it will be easy to crack, especially when it is subjected to external force. It is also related to the high content of calcium oxide in ash calcium powder.
2. Why does the putty powder become thinner after adding water?
Cellulose is used as a thickener and water-retaining agent on putty. Due to the thixotropy of cellulose itself, the addition of cellulose in putty powder also leads to thixotropy after adding water to the putty. This thixotropy is caused by the destruction of the loosely bonded structure of the putty powder. This structure arises at rest and breaks down under stress. That is to say, the viscosity decreases under stirring, and the viscosity recovers when standing still.
3. What is the reason why the putty is relatively heavy in the scraping process?
In this case, the viscosity of the cellulose generally used is too high. Some manufacturers use 200,000 cellulose to make putty. The putty produced in this way has a high viscosity, so it feels heavy when scraping. The recommended amount of putty for interior walls is 3-5 kg, and the viscosity is 80,000-100,000.
4. Why does the same viscosity cellulose feel different in winter and summer?
Due to the thermal gelation of the product, the viscosity of the putty and mortar will gradually decrease with the increase of temperature. When the temperature exceeds the gel temperature of the product, the product will be precipitated 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 the viscosity is lower. It is suggested that in summer, try to choose a product with a higher viscosity when applying the product, or increase the amount of cellulose.
Post time: Nov-30-2022