When selecting a suitable polyester resin for TGIC formulation coatings, several key factors need to be considered to ensure that the performance of the resin meets the requirements in different application environments.
1. Molecular Weight and Viscosity
Molecular weight: The polyester resins for TGIC based formulations affects the viscosity and flow of the coating. Higher molecular weights generally result in higher viscosity and are suitable for thicker coatings; lower molecular weights are suitable for thinner coatings and better spraying performance.
Viscosity: Viscosity is an important indicator of coating spraying and leveling. Resins with higher viscosity are suitable for coatings that require stronger adhesion and corrosion resistance, while resins with lower viscosity are suitable for applications with higher spraying and leveling requirements.
2. Weathering resistance and stability
TGIC formulations are often used in outdoor coatings, which require resins to have strong resistance to UV, moisture and high temperature. Choose polyester resins with good weathering resistance to ensure that the coating will not fade, crack or degrade when exposed to the external environment for a long time.
3. Curing performance
Different polyester resins have different temperature requirements during the curing process. The curing temperature of TGIC formulations is generally between 160°C and 200°C, and the curing time is 10 to 20 minutes. Choose a resin with curing properties suitable for the production process to ensure that the coating can be cured evenly and fully. For example, type YZ9803, ratio 93/7, acid value (mgKOH/g) 32~38, viscosity (pa-s/200℃) 3. 0~6. 0, glass transition temperature (Tg℃) 60~63, curing time (℃/min) 200℃×12', general weather resistance can also be cured with HAA
4. Chemical resistance
Chemical corrosion resistance: TGIC-formulated coatings are often used for products exposed to chemical environments, such as chemical containers, detergent sprayers, etc. Select resins with chemical resistance to ensure that the coating is not easily corroded by chemicals.
5. Environmental protection requirements
It is increasingly important to select low-VOC polyester resins. Such resins not only meet environmental standards, but also reduce the impact of coatings on air quality.
6. Compatibility with other components
Compatibility with curing agents: TGIC formulations usually need to be used in conjunction with curing agents (such as TGIC or HAA). Select resins that are compatible with these curing agents to ensure that the final performance of the coating meets expectations.
Miscibility with other resins: Some applications may require the use of polyester resins in combination with other types of resins, such as epoxy resins, so it is important to select a resin with good compatibility.
