Chromate-acrylic resin masking liquid with good secondary coating adhesiveness and preparation method and application thereof

Abstract

The invention discloses chromate-acrylic resin masking liquid with good secondary coating adhesiveness and a preparation method and application thereof. The masking liquid is prepared by an inorganiccomponent, polyhydric alcohol and acrylic acid emulsion according to a mass ratio of (5 to 20):(0.1 to 1.0):1. The inorganic component comprises 1-8 parts of magnesium oxide, 14-29 parts of chromic anhydride, 0.1-0.8 parts of boric acid and 50-95 parts of water in parts by mass. The acrylic acid emulsion is prepared by polymerizing 40-70 parts of pre-emulsion, 1-8 parts of sodium bicarbonate and 40-70 parts of water in parts by mass, wherein the pre-emulsion is prepared by pre-emulsifying 1-5 parts of ammonium allyloxy fatty alcohol oxyethylene ether sulfate, 2-10 parts of potassium persulfate, 50-70 parts of methyl methacrylate, 30-50 parts of ethyl acrylate, 1-10 parts of N-hydroxyethyl acrylamide, 1-6 parts of a chain transfer agent and 80-100 parts of water in parts by mass. The masking liquid is applied to a silicon steel sheet, so film formation quality and secondary film formation adhesiveness of a silicon steel ground coating are remarkably improved.

Description

technical field [0001] The invention relates to a silicon steel sheet coating, in particular to a chromate-acrylic resin coating solution with good secondary coating adhesion and its preparation method and application. Background technique [0002] Cold-rolled non-oriented silicon steel sheets are mainly used to manufacture various types of motor cores. Silicon steel sheets need to be stacked together in the process of making the iron core. When the motor is running at the operating frequency, the alternating magnetic field will cause eddy current loss in the iron core. Therefore, it is necessary to apply an insulating coating on the surface of the silicon steel sheet. This insulating coating not only needs to have good insulation, but also has good punchability, adhesion and corrosion resistance. [0003] When the electrical machinery factory manufactures hydropower, nuclear power, and large and medium-sized generators, it is necessary to coat a layer of 3-12 μm special en...

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Problems solved by technology

[0005] Japanese patent 2003-313443 discloses a method using 100 parts of chromic acid + 5 to 50 parts of 0.04 to 0.19 μm fine particle organic resin emulsion + 10 to 45 parts of boric acid + 10 to 35 parts of MgO, CaO or Al 2 o 3 + 10-30 parts of reducing agent + 1-7 parts of surfactant, the characteristics and appearance of the insulating film are also good, but this patent is only aimed at improving the performance of the insulating coating itself and after annealing, and does not involve the coating on the undercoating The adhesion between the second coating and the environmental protection C6 thick coating is difficult to meet the individual needs of users

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