How to test the hydrolysis resistance of polyether polyols?

Polyether polyol hydrolysis resistance test and its influencing factors analysis

Polyether polyol is an important chemical raw material, which is widely used in polyurethane, coatings, adhesives and other fields. Its hydrolysis resistance directly affects the service life and application range of the product, so it is very important to test and evaluate this performance. In this paper, the test method of hydrolysis resistance of polyether polyol and its influencing factors will be analyzed in detail.

1. hydrolysis resistance test definition and significance

Hydrolysis resistance refers to the ability of a material to maintain its physical and chemical properties in water or humid environments. In the case of polyether polyols, hydrolysis can lead to molecular chain scission, which in turn affects the strength, flexibility and other key properties of the material. Therefore, testing its hydrolysis resistance is helpful to optimize the production process, improve product quality, and broaden its application fields.

2. polyether polyol hydrolysis resistance test method

Two methods are usually used to test the hydrolysis resistance of polyether polyols: water bath method and accelerated aging test method.

1. water bath method Polyether polyol samples were placed in water at different temperatures and pH values and periodically examined for changes in molecular weight, viscosity, and changes in physical properties. This method simulates the actual use environment, and the test results are reliable, but it takes a long time.

2. accelerated aging test method The hydrolysis process of polyether polyol is accelerated by means of high temperature, high pressure and addition of catalyst. This method can significantly shorten the test cycle and is suitable for rapid screening of hydrolysis resistance of materials.

3. Key Factors Affecting Hydrolysis Resistance

In addition to the test method, many factors can affect the hydrolysis resistance of polyether polyols:

1. structural factors (1) Terminal functional groups: Polyether polyols containing isocyanate groups or hydroxyl groups are more susceptible to hydrolysis. (2) Molecular chain structure: The larger the molecular weight, the stronger the hydrolysis resistance.

2. synthetic method Different synthesis processes (such as ring-opening polymerization, step-by-step polymerization) will affect the structure and hydrolysis resistance of polyether polyols.

3. Environmental factors Environmental conditions such as ion concentration, temperature, and pH in the water can significantly affect the rate of hydrolysis.

4. Test Result Analysis and Application

Through testing and analysis, the hydrolysis resistance of polyether polyols can be obtained, which provides a scientific basis for material modification and product design. The test data help enterprises to optimize the production process, select the appropriate raw materials and additives, so as to improve product quality and market competitiveness.

5. summary and prospect

The hydrolysis resistance test of polyether polyols is of great significance for its application and performance optimization. In the future, with the continuous advancement of testing technology and in-depth research on material properties, it will promote the application of polyether polyols in more fields and improve their reliability in humid environments. Through system testing and data analysis, companies can more efficiently develop high-performance polyether polyol products to meet the diverse needs of the market.