With the continuous acceleration of the coating processing speed of coated paper, the performance requirements for the coating are becoming higher and higher. The coating should be able to quickly disperse and have good leveling properties during coating, so lubricants need to be added to the coating. The function of coating lubricant includes reducing the interfacial tension of the coating and lubricating the fluid; Improve the flowability of wet coatings to make them easy to flow and spread during coating; Make it easy to separate water from the coating during the drying process; Reduce the pollution of the paper surface and shaft, improve the phenomenon of fuzzing and powder loss caused by coating cracking, and improve the cutting performance of coated paper. In actual production processes, coating lubricants can reduce the friction between the coating and the coating device, improve the performance of the coating, and also reduce the phenomenon of "sticking cylinder" during the coating process.
Calcium stearate is a good non-toxic heat stabilizer and lubricant, as well as a polishing agent and water resistant agent for adhesives and coatings. It is widely used in chemical production processes such as plastics and rubber. But it is cheap and easy to obtain, with low toxicity and good processing performance. It has synergistic effect with zinc soap and Epoxide to improve the thermal stability.
Calcium stearate lubricant is still a kind of conventional coating lubricant with a wide range of applications. The solid content of commonly used Calcium stearate lubricant can reach more than 50%, and the particle size is mainly 5 μ M-10 μ Between m, the conventional dosage is between 0.5% and 1% (absolute dry to absolute dry). The advantage of Calcium stearate is that it can significantly improve the problem of powder loss of coated paper.
Post time: Aug-14-2023