Study On Laser Marking Of Polycarbonate And ABS Resin

There are many shortcomings of traditional printing technologies, such as markings are beyond recognition because of they are vulnerable to mechanical friction or chemical reaction, but also very difficult to apply to curved or textured surface printing. The laser marking, this outcome of modern high-tech laser technology, effectively overcomes or solves the above problems and it has become the most viable new type of printing, marking technologies. Laser marking is the use of laser energy to generate markings in a variety of materials. From metal, glass to ceramics and plastics, can be laser printed and marked. For the different types of materials, laser marking effect is different. In this paper, a variety of polymer blends based on polycarbonate, polyethylene, ABS resin with different additives, are prepared by melt blending, and then marked by laser. Studied the markability of these blends may, tried to develop an effective laser marking additives, and exploited mechanism of the laser marking processing.Polycarbonate (PC) is an extremely important one in general engineering plastics. The series of inorganic nano-materials La are melting blended with PC to compare the effect of laser markings with different ratio of PC / La blends, as well as with different types of inorganic nano-materials. The results showed that La series of inorganic nano-materials can effectively improve the quality of laser marking on PC. Different kinds of inorganic nano-materials to improve the lasermarking are also different. La1 improves the mark quality on PC the best. Through the mechanical properties and flame-retardant type of testing, the effect of inorganic nano-materials La on mechanical properties and flame-retardant properties of PC. Studied the nature properties of black markings on the material by TGA, XRD spectra, ATR-FTIR spectra and SEM photographs of various analytical techniques.To improve the effectiveness of laser marking, both changing the nature properties of the material itself and regulating the laser system can achieve this goal. Based on PC/La1 blends, densitometer was applied to study the effect of laser intensity on the quality of laser markings. The results show that within a certain range of intensity, the greater the laser intensity possesses, the more clearly marking appears. The links between the carbon layer of the markings and laser intensity are observed through the microscope. By measuring the Shore D hardness of the markings, the relationship between the hardness of markings and the laser intensity is studied. The results showed that mark hardness decreases with increasing laser intensity trend. Many ABS products need to mark text, patterns, and therefore the laser marking has great application room. But without laser marking additives, the marking quality is very poor on ABS. The nano-TiO2 and ABS are blended to study the quality of laser marking, and the blends are compared with the ABS / inorganic nano-materials La1 blend. The results show that the nano-TiO2 can effectively improve the quality of ABS mark, but La1 can not, and will inhibit TiO2 effect.The vast majority of laser marking is only black and white. People have been exploring color laser marking method, reported some indirect color laser marking method, but the real sense of the color laser marking does not currently exist. PE, as the base material, blended with organic pigments and carbon black b, is processed by laser. By taking advantage of the principle that the volatilization of various substances needs different energies, color laser marking is realized to some extent.While exploring the different types of laser marking additives, we found that ionic liquids can effectively improve the laser marking quality on PC, we suggested its role in the promotion of PC thermal degradation. The the vertical combustion, limiting oxygen index were used to study ionic liquids influence on the PC flame-retardant performance. The results showed that ionic liquids can effectively improve the flame-retardant performance of PC. SEM photographs also showed that the morphology and structure of the post-combustion residual carbon layer can effectively retard the combustion. Melt flow index and TGA analysis showed that the ionic liquids can promote the degradation of PC.