UV curing technology (UV curing technology) has the advantages of no inert solvent volatilization, short curing time, low temperature curing and other traditional curing technologies, called a new generation of green technology. As an energy-saving and environmentally friendly technology, photocuring technology has been widely used in many fields such as coatings, inks, adhesives, printing plates, electronics industry, micro-machining and rapid prototyping. Applying the curing technology to the composite manufacturing process not only solves some of the process problems, but also facilitates the automation of large-scale modern industrial production, while meeting modern environmental requirements. The photocuring technology of resin-based composite materials is another new development direction of UV curing technology in recent years. The photocuring technology is applied in the field of composite materials, which is different from other fields. The parts are relatively thick (several mm or even several cm). Therefore, the relationship between the curing process conditions of the photocurable resin system and the thickness of the part is studied. The progress of the material photocuring process has great guiding significance. Beijing University of Aeronautics and Astronautics selected T20 and 651 photoinitiators to prepare unsaturated polyester systems with initiator concentrations of 0.25, 0.5, and 1 wt%. The effect of the photoinitiator concentration on the degree of curing was determined by measuring the microhardness of the photocured sample. The results show that increasing the concentration of the initiator can inhibit the inhibition of oxygen, but for thicker samples, too high an initiator concentration will result in incomplete curing. In this experiment, the curing process of the photocurable resin system was determined by studying the effect of different photoinitiator concentrations on the curing behavior of the resin system.
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UV curing technology is a new generation of green technology
The advantage is firstly that the upper surface of the resin system is exposed to the air, and the degree of curing of the upper surface resin is affected by oxygen inhibition. When the incident light intensity is constant, increasing the concentration of the initiator can alleviate the inhibition of oxygen, thereby improving the surface solidification quality of the sample; when UV passes through the resin layer, reflection, absorption and scattering occur, when incident When the UV intensity and initiator concentration are constant, the degree of curing of each layer (except the upper surface) decreases with increasing distance from the surface; for the curing thickness required for this experiment, the amount of initiator is higher than conventional The amount used in the UV coating is small. This is because the concentration of the initiator is too large, and a high concentration of free radicals will be generated in the near-surface region of the resin. The light is absorbed and scattered in the upper layer so that the light reaching the depth of the sample is greatly weakened, so that the thick part cannot be thickened. Fully cured; comparing the two initiators, the curing performance of the initiator TPO is better than 651.
The Institute of Materials Science and Technology of Wuhan University of Technology studied the effects of photoinitiators and thinners on the UV curing rate of general-purpose 191# unsaturated polyester resin. Studies have shown that photoinitiator types and diluent contents have an effect on the curing speed and their The content has the best value. For the UV curing reaction of 191# unsaturated polyester resin, the type and content of photoinitiator in the curing system, the content of diluent in the resin, etc. have an effect on the curing speed of the system. Choosing an appropriate curing system can greatly improve the curing speed. .