Pure lactic acid is a colorless liquid, is a colorless to pale yellow liquid. Odorless, hygroscopic. The relative density of 1.2060 (25/4 ℃). Melting point 18 ℃. Boiling point 122 ℃ (2kPa). Refractive index nD (20 ℃) ??1.4392. With water, ethanol, glycerin, insoluble in chloroform, carbon disulfide and petroleum ether. Heating under normal pressure, concentrated to 50%, part of the anhydride into milk, thus products often contain 10% -15% of the milk anhydride.
2013年10月31日星期四
Electroless plating reaction requires high temperature
Acidic electroless nickel plating , because the electroless plating reaction requires high temperature, easy to cause plastic deformation , so the low-temperature electroless nickel electroless nickel is the most striking and the most meaningful research directions. Ethyl lactate nickel from low perspective of the development of this research are reported in the direction of increasing , new processes and methods continue to emerge, but to make low temperature electroless nickel plating in obtaining more excellent performance of the coating while still achieving high the deposition rate , remains to be further study of scientific researchers , in addition,buffered lactic acid of the plating bath is smooth plating , electroless plating and reduce the cost of the important factors. Therefore, the development of high stability , environment-friendly , low temperature, high deposition rate of electroless nickel plating process has significant social and economic significance.
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