Among the many systems of coil coatings, they are highly favored due to their excellent comprehensive performance, and it is crucial to control performance redundancy and accurately apply additives. Taige additives provide solutions to typical pain points in coil coatings, offering high-performance and safe reliable additive products.
Roll coating has the production efficiency and quality advantages of fast coating speed, uniform coating, and stable quality. In terms of long-term economic benefits, the pre coating process reduces overall costs, has good coating durability, long service life, and reduces maintenance costs. Its application areas are mainly in the fields of construction, home appliances, and automobiles.
The coil coating needs to maintain stability in harsh outdoor environments and complex processing scenarios. A core contradiction lies in the difficulty of balancing weather resistance and flexibility – resins that provide weather resistance often have strong rigidity, while high flexibility resins typically have poor weather resistance. In addition, the difference in thermal expansion coefficient between the coating and the metal substrate can easily lead to microcracks under extreme temperature changes, affecting the anti-corrosion effect. The above problems can be improved through additives
As the “outer layer” of metal sheets, coil coatings provide crucial aesthetic and durability protection for products in fields such as construction, home appliances, and automobiles through efficient pre coating processes. However, under the process requirements of high-speed continuous production, excellent coating performance faces many severe challenges. The following will analyze in depth the industry pain points and innovative additive solutions of coil coatings (taking saturated polyester amino system as an example) based on specific technical solutions.
Some typical problems with coil varnish are common, especially after the coating is put into production. High speed coating highlights these issues, mainly including the following three pain points:
There are many variables involved in the entire coating preparation and roll coating process, and the consideration of formula performance redundancy is precisely the experience and skills of senior engineers/formulators. Thanks to the rich experience of Tiger additives in industry applications, we will assist you in solving the above problems and provide industry solutions for additives to showcase.
● Formula addition amount
● Recommended Products
● Effect of action
● Performance test
This solution can effectively solve the problems of poor curing such as sticking, poor adhesion, and poor impact resistance on the surface of the painted varnish of the coil, as well as coating defects such as glossiness, bubbles, and stripes.
Compared with glossy oil, the presence of matte powder can enhance the foam stability of coil coatings. Matte powder (such as silica) is a porous particle with a large specific surface area and adsorption capacity, which can stabilize the bubble film and prevent the smooth removal of bubbles inside the paint film, thereby forming “prickly heat” on the surface of the paint film.
● Formula addition amount
● Recommended Products
● Performance test
Tech-426F additive can better destroy the bubble liquid film caused by matte powder, reduce the occurrence of stable bubbles, and when combined with high-performance catalysts, adhesion promoters, and leveling agents, can significantly reduce white spots, improve the alignment performance of matte powder, and enhance the mechanical strength of coatings. This scheme has excellent thermal stability.
The main issues with roll white paste are related to whiteness, yellowing, and paint film performance, which are not only related to the titanium dioxide itself, but also the selection of dispersants is crucial. The surface of titanium dioxide (such as alumina treatment) is negatively charged and alkaline. Polyether carboxylic acid surfactants and polyether phosphoric acid surfactants commonly used for dispersing titanium dioxide have poor stability at high temperatures, but their high temperature resistance can be significantly improved by polyester modification (such as Tech-5366)
● Formula addition amount
● Recommended Products
● Performance test
Tech-5366 dispersant endows polyester white paste with a ‘high solid, low viscosity’ state, and its steric hindrance ensures almost no change in viscosity and glossiness before and after thermal storage testing, resulting in excellent thermal stability. Tiggo additives minimize the yellowing problem of the dispersant itself caused by benzene ring/naphthalene epoxidation, unsaturated bond breakage, and nitrogen-containing group decomposition.
Polyester iron oxide baking paint combines the durability of polyester resin and the color stability of iron oxide pigments, but it is prone to problems such as floating color, storage/high-temperature curing loss of gloss, and post thickening during production and construction. For this type of powder, we still recommend using Tech-5366 as a solution. Its stability in wrapping inorganic surfaces at high temperatures is easy to handle with ease.
● Formula addition amount
● Recommended products
● Performance testing
Tech-5366 does not contain PFAS, benzene solvents, or organotin. Its modified polyester long chain can build a thicker solvation layer, which can resist high temperature, shear force, and electrolyte interference by wrapping around the pigment surface to form steric hindrance, achieving stability (viscosity stability, glossiness stability, anti floating color stability).
Polyester black paste needs to maintain small particle size, high blackness, high glossiness, and wetting of powder under high temperature curing conditions. Its anti floating color performance is also one of the key considerations. For coil coatings with high requirements, Tech-6202 super dispersant is a good choice
● Formula addition amount
● Recommended products
● Performance testing
Formula testing shows that Tech-6202 exhibits excellent blackness, glossiness, and thermal storage stability, as well as good anti floating performance, making it very suitable for coil coating systems with high requirements for black color paste performance.
Compared with carbon black, although the surface properties of phthalocyanine blue are similar, the requirements for pigment dispersion and encapsulation are also different due to the different particle sizes. Larger phthalocyanine blue requires the super dispersant to have more anchor points to prevent the dispersant from desorbing from the phthalocyanine blue pigment surface caused by molecular motion at high temperatures
● Formula addition amount
● Recommended products
● Performance testing
Using Tech-5041 super dispersant to stabilize phthalocyanine blue and effectively prevent pigment flocculation. Formula testing shows that there is no loss of gloss or significant thickening of the slurry before and after thermal storage, demonstrating excellent stability.
PY139 yellow pigment exhibits excellent weather resistance. As an isoindolinone type pigment, its molecular structure is larger and more rigid compared to other pigments, with high surface energy that is not easily wetted. Unlike the large π bonds that anchor blue black pigments, dispersing Y139 requires more types of anchoring groups on the dispersant chain segments
● Formula addition amount
● Recommended products
● Performance testing
Formula testing shows that using Tech-5350 super dispersant to stabilize PY139 yellow can effectively reduce the occurrence of slurry loss of gloss and post thickening. Both before and after thermal storage show excellent stability
We provide a series of solutions in the field of coil coatings, focusing on the seven pain points of two-component polyester amino systems. We provide detailed formulas and performance test data for gloss oil, matte oil, and specific color pastes, demonstrating high-quality and stable coating effects.
Taige Additive is willing to work hand in hand with you to explore the future development of coil coating together,
Assist coil customers in reducing costs and increasing efficiency, and jointly solve industry-leading pain points!
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