Polyether polyols in coatings for leveling and weathering resistance testing

Polyether polyol is a kind of chemicals widely used in coatings, adhesives, foams and other fields, and its excellent performance makes it occupy an important position in coating formulations. In the coatings industry, leveling and weather resistance are the key indicators to measure the performance of coatings, and polyether polyols play an important role in these two aspects. In this paper, the leveling and weather resistance test standards of polyether polyols in coatings will be analyzed in detail, and its performance in practical application will be discussed.

1. Polyether polyol in the coating of the role

As an organic compound, polyether polyol has excellent flexibility, water resistance and chemical stability. In coating formulations, polyether polyols are usually used as dispersants, thickeners or film-forming additives, which can significantly improve the leveling and film-forming properties of coatings. Polyether polyols can also improve the weather resistance of the coating, so that it can maintain stable performance under different weather conditions.

2. leveling test standard

The leveling refers to the ability of the coating to form a uniform coating on the surface after construction, which directly affects the appearance and construction efficiency of the coating. Polyether polyols can significantly improve the leveling properties by adjusting the viscosity and rheological properties of the coating.

2.1 leveling test method

The leveling test usually includes the following methods:

1. Glossy Flow Test: Evaluate the anti-sagging performance of the paint by measuring its leveling on a vertical surface. The addition of polyether polyol can reduce the thixotropy of the coating and reduce the occurrence of sagging.

2. Flatness determination (Flow-out Measurement): The levelness of a paint is evaluated by measuring its spread on a horizontal surface. Polyether polyols can enhance the fluidity and spreadability of the coating, thereby improving the leveling.

3. Rheological property test: The shear viscosity and time viscosity of the coating were measured using a rheometer to evaluate its rheological properties. Polyether polyols can adjust the rheological behavior of the coating, making it easier to apply during the construction process.

2.2 POLYETHER POLYOLS ON FLOATING OPTIMIZATION

Polyether polyols optimize the leveling of the coating:

1. Reduced thixotropy: Thixotropy refers to the characteristics of the viscosity of the coating after being subjected to shear. Polyether polyols can reduce the thixotropy of the coating, making it easier to flow and spread during construction.

2. Improve fluidity: Polyether polyol can reduce the viscosity of the coating, thereby improving its fluidity, so that it can quickly form a uniform coating after construction.

3. Enhanced spreadability: Polyether polyols can enhance the spreadability of the coating, so that it can cover the surface and reduce defects after construction.

3. Weather resistance test standard

Weather resistance refers to the performance of coatings in long-term exposure to outdoor environments, including anti-aging, anti-ultraviolet, anti-temperature changes and anti-humidity changes. Polyether polyols can significantly improve weather resistance in coatings.

3.1 weathering test method

Weather resistance testing usually includes the following methods:

1. UV Aging Test: Evaluate the aging performance of coatings in outdoor environments by simulating ultraviolet radiation. Polyether polyols can absorb ultraviolet rays and reduce their damage to the coating film.

2. Temperature cycle test (Temperature Cycling Test): The thermal stability of the coating is evaluated by simulating different temperature changes. Polyether polyol can improve the thermal stability of the coating and reduce the effect of temperature change on its performance.

3. Humidity Aging Test (Humidity Aging Test): Evaluate the moisture resistance of the coating by simulating a high humidity environment. Polyether polyols can improve the moisture resistance of coatings and reduce the effect of moisture on their performance.

4. Aging test box test (Weathering Test in Cabinet): Evaluate the weather resistance of the coating by simulating environmental factors such as sunlight, rain, temperature and humidity. Polyether polyols can improve the weather resistance of coatings and keep them stable in complex environments.

3.2 POLYETHER POLYOL ON WEATHERING OPTIMIZATION

Polyether polyols optimize the weatherability of coatings:

1. UV absorption: Polyether polyols can absorb ultraviolet rays, reduce the damage of ultraviolet rays to the coating film, thereby improving the aging resistance of the coating.

2. Improve thermal stability: Polyether polyols can improve the thermal stability of the coating and reduce the impact of temperature changes on its performance.

3. Enhanced moisture resistance: Polyether polyols can improve the moisture resistance of coatings and reduce the impact of moisture on their performance.

4. Summary

The leveling and weather resistance of polyether polyols in coatings are important reasons for their wide application in the coatings industry. Through reasonable test standards, the influence of polyether polyol on coating performance can be comprehensively evaluated, and reference can be provided for its optimization in practical application. In the future, with the continuous development of coating technology, the application prospect of polyether polyol will be broader, and its performance in leveling and weather resistance will be further improved.