2024-07-05- readings1. Introduction
Putty powder is a common material used for wall leveling, repairing and decoration in construction projects. Its quality and construction effect directly affect the appearance and service life of the final coating. However, putty powder falling off is a common problem in construction projects, which seriously affects the wall decoration effect and structural stability. This article will discuss in detail the methods to prevent putty powder from falling off from multiple aspects such as material selection, construction technology, substrate treatment and cellulose application, and provide professional and well-reasoned analysis.
2. Analysis of the causes of putty powder falling off
Before discussing the measures to prevent putty powder from falling off, it is necessary to understand the main reasons for putty powder falling off. Generally speaking, the reasons for putty powder falling off include the following:
1. **Improper substrate treatment**: The surface of the substrate is not cleaned and contains impurities such as oil, dust, etc., which affects the adhesion of putty powder.
2. **Putty powder quality problems**: The formula of putty powder itself is unreasonable, resulting in insufficient adhesion.
3. **Improper construction technology**: The construction process is not in accordance with the specifications, such as the putty layer is too thick, not fully dried, etc.
4. **Environmental factors**: The humidity in the construction environment is too high and the temperature is too low, which affects the drying and curing of the putty powder.
3. Measures to prevent putty powder from falling off
3.1 Material selection
Choosing high-quality putty powder is the first condition to prevent falling off. High-quality putty powder should have the following characteristics:
1. **High adhesion**: Ensure that there is sufficient adhesion between the putty powder and the substrate.
2. **Good crack resistance**: Prevent the putty layer from cracking during the drying process.
3. **Appropriate flexibility**: Able to adapt to slight deformation of the substrate.
Choosing the right putty powder brand and formula is an important prerequisite for preventing falling off.
3.2 Substrate treatment
Before construction, the substrate must be fully treated:
1. **Clean substrate**: Ensure that there is no oil, dust, loose objects and other impurities on the surface of the substrate. It can be cleaned with water or neutral detergent and polished if necessary.
2. **Moisturizing the substrate**: On the surface of the dry substrate, proper moistening can help improve the adhesion of the putty powder, but there should be no visible water.
3. **Use of interface agent**: Applying the interface agent on the surface of the substrate can enhance the bonding between the putty powder and the substrate.
3.3 Construction process
Standardized operation of the construction process is the key to ensure that the putty powder does not fall off:
1. **Strictly control the thickness of the putty layer**: The thickness of the putty layer for each scraping should be controlled between 1-2mm to avoid excessively thick scraping at one time, resulting in uneven drying and cracking.
2. **Layered scraping**: If a thicker putty layer is required, it should be scraped in multiple times. After each scraping, the next layer should be constructed after the previous layer is completely dry.
3. **Sufficient drying**: Ensure that each layer of putty is fully dried and avoid construction in an environment with too high humidity or too low temperature.
4. **Reasonable construction environment**: Avoid construction in high humidity, low temperature or high temperature. These environmental factors will affect the curing and bonding properties of putty powder.
3.4 Control of environmental factors
The construction environment has a direct impact on the curing and adhesion of putty powder:
1. **Temperature control**: The construction temperature should be between 5-35℃, and construction should be avoided under extreme temperatures.
2. **Humidity control**: The relative humidity of the construction environment should be controlled between 50-70%, and construction should be avoided under high humidity.
3. **Ventilation conditions**: Ensure good ventilation at the construction site to help the putty powder dry and cure.
4. Application of cellulose in putty powder
As a functional additive in putty powder, cellulose has many functions and can significantly improve the performance of putty powder and prevent it from falling off. The following are the main applications of cellulose in putty powder:
4.1 Thickening effect
Cellulose has a good thickening effect, which can increase the viscosity of putty powder, making it easier to apply and scrape during construction, and reducing sagging and splashing. In addition, the thickening effect can also increase the construction thickness of putty powder and reduce the risk of shrinkage and cracking.
4.2 Improve construction properties
Cellulose can improve the construction properties of putty powder, making it have good lubricity and fluidity. During the construction process, cellulose can make the putty powder form a uniform coating on the surface of the substrate, improve adhesion, reduce construction difficulty and rework rate.
4.3 Improve water retention
Cellulose has excellent water retention, which can effectively retain the moisture in the putty powder, delay its drying time, and enable the putty powder to be fully hydrated and solidified during the construction process. Good water retention can not only improve the adhesion of putty powder, but also prevent cracking and falling off caused by drying too quickly.
4.4 Enhance crack resistance
Cellulose can improve the flexibility and crack resistance of putty powder, so that it can adapt to the slight deformation of the substrate during the drying process and prevent the putty layer from cracking and falling off. In addition, the presence of cellulose can also improve the impact resistance of putty powder and enhance its durability.
4.5 Improve stability
Cellulose can improve the storage stability of putty powder and prevent it from precipitation and stratification during storage. Cellulose, through its thickening and water-retaining effects, keeps the putty powder uniform and stable during storage, extending its service life.
5. Experimental verification and application examples
In order to verify the application effect of cellulose in putty powder, the following experiments and actual engineering applications can be used for verification:
1. **Bonding strength test**: Compare the bonding strength of putty powder with and without cellulose on the substrate to evaluate its adhesion.
2. **Crack resistance test**: Measure the shrinkage and cracking of putty powder during the drying process to evaluate its crack resistance.
3. **Constructability test**: Evaluate the spreadability, fluidity and drying time of putty powder with cellulose in the actual construction environment.
4. **Durability test**: Perform durability tests on putty powder under different environmental conditions (such as high temperature, high humidity, and low temperature) to evaluate its stability and anti-aging performance.
6. Conclusion
Preventing putty powder from falling off is the key to ensuring wall decoration effect and structural stability in construction projects. By selecting high-quality putty powder, reasonable substrate treatment, standardized construction technology and controlling the construction environment, the adhesion and durability of putty powder can be effectively improved. Cellulose, as an important additive in putty powder, significantly improves the performance of putty powder and prevents it from falling off through its thickening, water retention, improved construction properties and enhanced crack resistance. In the future, with the continuous development and improvement of cellulose technology, its application prospects in putty powder will be broader.
