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Polyaspartic polyurea is an emerging synthetic material in the polyurea industry, featuring weather resistance, slow reactivity, solvent-free composition, and high mechanical strength. Often termed as the "third generation of polyurea," its two main components are polyaspartic resin and isocyanate curing agents. Currently, this material has gained broad applications in the coatings industry, including coatings for wind turbine blades, construction machinery, roofing, and high-end flooring. We are also exploring its future applications in the adhesive sector.
The adhesiveness of polyaspartic polyurea varies significantly depending on the substrate. For materials like PVC, ABS, iron, wood, stone, and glass, adhesion is relatively straightforward. In contrast, substrates like PP, PE, aluminum, and stainless steel require specialized adhesive formulations to enhance adhesion.
Polyaspartic polyurea is not a specific material but rather a category that encompasses a wide range of performance characteristics. Therefore, it offers high versatility. By selecting different polyaspartic resins and isocyanate curing agents, we can engineer a material to have specialized performance characteristics. Below are some design considerations for formulating polyaspartic polyurea adhesives.
The formulation often includes additives like thickeners, substrate wetting agents, adhesion promoters, and pigments. These additives should preferably be incorporated into the resin component and not the curing agent, as the latter is highly reactive and susceptible to moisture absorption, leading to thickening and degradation. It's crucial to avoid additives that introduce amine, hydroxyl, and similar compounds, as they can catalyze the resin and significantly reduce the working time.
In certain situations that require rapid adhesion, the reaction speed of polyaspartic polyurea adhesive is adjustable, with gelling times ranging from one to several minutes. Two design options are available: the first involves high-activity polyaspartic resins like F220 combined with aliphatic isocyanate curing agents such as HDI trimer. The second option utilizes conventional polyaspartic resins like F420 and F520 with high-activity aromatic isocyanate curing agents like MDI and TDI pre-polymers.
For applications requiring high resistance to yellowing, such as sealants for window sills or adhesives for outdoor LED lighting, resins like F520, F420 are recommended. The curing agent can vary depending on specific mechanical property requirements, with options including conventional trimers, urea condensates, or additives like HDI/IPDI and polyester or polycarbonate diols.
In summary, polyaspartic polyurea offers a wide array of characteristics including solvent-free composition, resistance to yellowing, fast reactivity, and high mechanical strength. It's an excellent alternative for special applications where traditional adhesives like epoxy, polyurethane, and silicone fall short.
Feiyang has been specializing in the production of raw materials for polyaspartic coatings for 30 years and can provide polyaspartic resins, hardeners and coating formulations. Some of our polyaspartic coating formulations: Polyaspartic Coating
Feel free to contact us: marketing@feiyang.com.cn
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Learn more polyaspartic knowledge: Polyaspartic FAQ
