Focus on Cellulose ethers

Effect of Cellulose Ether in Putty Powder Application

Effect of Cellulose Ether in Putty Powder Application

What is the reason for the putty powder to dry quickly?

This is mainly related to the addition of ash calcium and the water retention rate of the fiber, and also related to the dryness of the wall.

What about peeling and rolling?

This is related to the water retention rate, which is easy to occur when the viscosity of cellulose is low or the amount of addition is small.

Does it sometimes have pinpoints?

This is related to cellulose, which has poor film-forming properties, and at the same time, the impurities in cellulose react slightly with ash calcium. If the reaction is severe, the putty powder will appear like bean curd residue. It can’t be put on the wall, and it doesn’t have cohesive force at the same time. In addition, this situation also occurs with products such as carboxyl groups added to the cellulose.

Volcanoes and pinholes?

This is obviously related to the water surface tension of the hydroxypropyl methylcellulose aqueous solution. The water table tension of hydroxyethyl aqueous solution is not obvious. It would be fine to do a finishing treatment.

Why does the putty powder become thinner after adding water?

Cellulose is used as a thickener and water-retaining agent in the putty. Due to the thixotropy of cellulose itself, the addition of cellulose in the putty powder also leads to thixotropy after adding water to the putty. This thixotropy is caused by the destruction of the loosely combined structure of the components in 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.

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.

Why does the putty and mortar made of cellulose with the same viscosity feel different in winter and summer?

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 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 recommended to choose products with high gel temperature when applying products in summer. The gel temperature of the product is generally above 75 degrees. Wall putty national standard (JG/T298-2009) standard requirements, product quality is stable, zero voc environmental performance is good. Generally, the gel temperature of methyl cellulose is about 55 degrees in summer. If the temperature is slightly higher, its viscosity will be greatly affected.

Post time: May-06-2023
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