Application of alumina bulk fiber in coatings

03 / Dec / 2024
Application of alumina bulk fiber in coatings

The preparation method of alumina bulk fiber usually includes the following steps:

Raw material synthesis: alumina precursor is synthesized by sol-gel method or chemical vapor deposition method.

Fibrosis treatment: The precursor is subjected to high-temperature calcination to form alumina fibers.

Shear dispersion: Using a high-speed shearing machine to break up alumina fibers into loose cotton shapes.

Surface modification: Using surfactants to modify alumina fibers to improve their dispersibility and stability in coatings.

 

The basic characteristics of alumina bulk fiber are that it is an inorganic fiber material mainly composed of alumina, which has the following characteristics:

High melting point: The melting point of alumina fibers is as high as 1800 ° C, much higher than traditional organic fibers.

High strength and high modulus: Alumina fibers have excellent mechanical strength and modulus, which can significantly improve the wear resistance and impact resistance of coatings.

Good chemical corrosion resistance: Alumina bulk fibers have good corrosion resistance to most acids, alkalis, and organic solvents.

Low thermal conductivity and low thermal expansion coefficient: These characteristics enable alumina bulk fiber  to remain stable in high temperature environments.

 

Application Of Alumina Bulk Fiber In Coatings

 

Here are some key points for the application of alumina bulk fiber in coatings:

1. Enhance coating performance: Alumina fiber, as a high-performance inorganic fiber, has high strength, high modulus, low thermal conductivity, low thermal expansion coefficient, as well as good heat resistance and high temperature oxidation resistance. These characteristics enable alumina bulk fiber to effectively enhance the coating strength of coatings.

2. Improving coating performance: The addition of alumina fiber cotton can significantly enhance the hardness, stain resistance, and scrub resistance of the coating. Experiments have shown that as the amount of alumina fiber increases, the hardness of the coating gradually increases, the scrub resistance increases from over 20000 to over 30000, and the stain resistance also gradually improves.

3. Preparation method: Alumina bulk fiber can be prepared into a stable suspension containing alumina bulk fibers through short cutting, dispersion, impurity removal, and modification steps, which can then be used for building latex coatings. During the preparation process, it is necessary to pretreat the alumina fibers, including high-speed shearing to disperse the fibers and separate the alumina particles, as well as modifying them with surfactants to improve their dispersion stability in water.

4. Coating formula: in the coating formula, alumina bulk fiber can be mixed with other raw materials such as silicone acrylic lotion, pigments and fillers, and various coating additives to form a composite coating. The adjustment of coating formula can optimize coating performance based on the amount of alumina fiber added.

5. Technical challenge: Due to the hydrophilicity of alumina fibers, it is necessary to improve their suspension stability in coating systems through dispersion and organic modification, such as silane coupling agent treatment, to enhance their dispersibility in organic media.

The surface of modified alumina fibers has hydrophobicity, which can reduce settlement caused by gravity and improve the stability of the coating.

 

In summary, the application of alumina bulk fiber in coatings can significantly improve the performance of coatings, especially in enhancing coating strength and improving stain resistance. By appropriate preparation and formulation adjustment, alumina bulk fiber can be used as an effective reinforcement material and widely applied in architectural coatings.

 

Conclusion: Alumina bulk fiber, as a high-performance inorganic fiber material, has broad application prospects in coatings. By optimizing the preparation process and formula design, the performance of coatings can be effectively improved to meet increasingly stringent requirements for industrial and architectural coatings. Future research should further explore the modification technology of alumina fiber cotton, reduce costs, and expand its application in the field of coatings.