Application of methamphetyl carbonate in coatings (2)

as can be seen from Table 4, the DMC volatility rate is slightly faster than most conventional solvents, but slower than ethyl acetate. Solvent volatility rate mainly affects the properties of coating film leveling, drying and so on, the DMC instead of traditional solvent paint, measure its drying time, observe the coating episodural state. For example, epoxy paint, see Table 5.
experiments show that DMC can partially replace traditional solvents from the volatility rate point of view, but all substitutions in some systems may produce problems of poor surface state.1.4 DMC after replacing traditional solvent coating properties with DMC, epoxy solvent dissolved 60% E-20 epoxy resin, measuring its rotational viscosity, see Table 6., the DMC dissolves E-20 epoxy resins faster and with less viscosity than epoxy solvents.50%, 60%, 70% and 100% of the epoxy solvents were replaced by DMCs, and the epoxy thickness paint was made to measure their performance in all aspects, compared with unstited paint samples, as seen in Table 7.. It can be seen that when the DMC part replaces the epoxy solvent, the coating film drying speed is increased, the viscosity of the system is reduced, which has a slight effect on the epigenesis of the coating film, but basically does not affect the performance of the product.. When DMC replaces 50% of epoxy solvents, all performance can meet the technical targets, see Table 8.. Experiments show that the performance of the paint samples made after DMC replaced 50% of the epoxy solvents in the original formula reached the technical targets.1.5 DMC low-temperature solidification problem DMC melting point is high, 2 to 4 degrees C, when the temperature drops to about 4 degrees C, that is, solid, so there is a low-temperature solidification problem, to its use and storage inconvenience.when the temperature is 4 degrees C, the DMC is mixed with several other commonly used solvents and the low temperature solidification is seen in Table 9.when the temperature is -9 degrees C, the DMC is mixed with several other commonly used solvents and the low temperature solidification is seen in Table 10.experiments have shown that when the temperature is 4 degrees C, 10% of other solvents are added to mix with it to solve the DMC low-temperature solidification problem, and when the temperature drops to -9 degrees C, at least half of the other solvents need to be added to keep it liquid.1.6 DMC safety performance DMC flammable, open fire, high heat and easy to burn, its steam and air mix, can form an explosive mixture, its flash point and explosion risk compared to conventional solvents see Table 11.. Note: Explosion risk ( upper explosion concentration - lower explosion concentration) / explosion lower limit concentration.can be seen from Table 11, DMC belongs to the flash point liquid, its flash point is lower than some commonly used solvents, but higher than toluene, ethyl benzene, ethanol and other commonly used solvents. The explosion risk is moderate compared with conventional solvents. Therefore, the DMC can be safely used in accordance with safety regulations.2 Conclusion Bicarbonate is a green environmentally friendly solvent that can replace traditional solvents used in the production of coatings, whether from environmental protection, occupational health or improve paint performance, reduce raw material costs and other aspects are worth vigorously promoting the application.
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