熱門關鍵詞：濟南彩鋼板 | 濟南復合板 | 濟南彩鋼瓦 | 濟南c型鋼 | 濟南鋼結構 |
With the rapid development of color board industry, the development of color board coatings with excellent performance to meet the needs of advanced and diversified products has become a research hotspot at home and abroad. It is very important to prepare the primer with good adhesion and flexibility, and good compatibility with the topcoat to improve the performance of color board coatings.
The galvanized sheet is used as the base plate, coated with organic coating, and the product is galvanized color coated sheet. Because the zinc layer of galvanized sheet is thin, the zinc content is usually 20 / 20g / m2, so the product is not suitable for outdoor production of walls and roofs. But because of its beautiful appearance and excellent processing performance, it can be mainly used in household appliances, audio, steel furniture, interior decoration, etc.
Due to many factors, the preparation of primer is a complex process. Domestic researchers have used orthogonal experiment method to determine the influence of various factors on the performance of epoxy primer, so as to reasonably determine a good formula with less steps. The prepared film has obvious advantages of hardness and solvent resistance, and good adhesion. According to experts, they focused on the selection of pigment base ratio, amount of crosslinking agent, catalyst, defoamer, surfactant reducing agent and wetting dispersant.
At 15%, the hardness is the same as the other three levels, but the other properties are poor; At 20%, the MEK Resistance and bending performance were good, and the adhesion was average (1.3); The MEK wiping resistance and hardness of the film are better when the content is 25%, while the other two are worse.
Considering the processability of color board, researchers choose the dosage of crosslinking curing agent 20%. Experts said that the above research has made a good start, but further research is needed, so as to truly break through the bottleneck of epoxy primer for color coated boards. In the experiment, the effect of four kinds of dosage on hardness is not obvious (the average value is 5.0); When the amount of crosslinking curing agent is 10%, the adhesion is good (the average is 0.3), the MEK Resistance is relatively poor, and the bending property is better.