Coated aluminum substrate for drilling PCB (Printed Circuit Board) and preparation method of coated aluminum substrate

Abstract

The invention discloses a coated aluminum substrate for drilling a PCB (Printed Circuit Board) and a preparation method of the coated aluminum substrate. The method comprises the following steps: taking 40-50 parts by weight of two or more of polyurethane, acrylic ester, aqueous phenolic resin and aqueous epoxy resin to form a component A1, then taking 40-55 parts by weight of two or more of polyoxyethylene, polyethylene glycol, glycerin, vinyl acetate and polyving akohol to form a component A2, taking 5-8 parts by weight of accessory ingredient, mixing the component A1, the component A2 and the accessory ingredient to obtain emulsion, coating the surface of an aluminum foil with the emulsion in a roller coating manner to prepare finished product. By using the characteristics of the surface layer resin of the aluminum foil of low hardness, low melting point, strong cohesive property and excellent water solubility, the coated aluminum substrate for drilling the PCB is capable of improving the drilling precision of a drill point in the drilling process, effectively reducing the working temperature of the drill point, prolonging the service life of the drill point and improving the hole wall quality of the drill hole.

Description

technical field [0001] The invention relates to the technical field of PCB manufacturing, in particular to a film-coated aluminum substrate for PCB drilling and a preparation method thereof. Background technique [0002] At present, most of the PCB drilling holes are uncoated aluminum foil, or a single-function coated aluminum base cover. In the field of drilling, due to the side slip of the drill pin at the moment of contact with the aluminum foil, the deflection of the drill pin is serious, the accuracy of the hole position is low, the corresponding hole wall quality is poor, and the drill pin is also worn; Coated with a layer of resin, the drill needle goes into the drill smoothly without side slipping, but it is similar to ordinary aluminum sheets in terms of hole wall quality and drill wear. Therefore generally speaking, the drilling efficiency of existing cover plates is still relatively low. [0003] Therefore, the prior art still needs to be improved and developed....

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a film-coated aluminum substrate for PCB drilling and its preparation method, aiming to solve the problems caused by the current aluminum foil for PCB drilling, such as low drilling accuracy and low drilling efficiency. , The problem of easy loss of drill needles