Waterborne polyurethane coating for coated aluminum sheets and preparation method of waterborne polyurethane coating

Abstract

The invention discloses a waterborne polyurethane coating for coated aluminum sheets and a preparation method of the waterborne polyurethane coating. The waterborne polyurethane coating comprises thefollowing components: 10-50 parts of water-soluble polyurethane resin, 5-40 parts of hot-melt resin, 2-30 parts of lubricating resin, 0.15-0.5 part of an adhesion promoter, 0.001-0.005 part of a PH regulator, 0.15-0.4 part of a defoaming agent, 0.06-0.3 part of a humectant and 20-80 parts of a solvent. The preparation method at least comprises the following steps: preparing a solvent according toan alcohol-water ratio of 8:2-3:7; sequentially stirring the water-soluble polyurethane resin with the hot-melt resin, the lubricating resin, the adhesion promoter, the PH regulator and the humectantin the solvent with a certain proportion until the materials are complete dissolved, slowly adding the defoaming agent, and continuing carrying out stirring for 30 minutes or more to prepare the waterborne polyurethane coating for the coated aluminum sheets. The waterborne polyurethane coating provided by the invention is applied to the coating of aluminum sheets, and the coating layers of aluminum sheets coated with the waterborne polyurethane coating provided by the invention have the effects of buffering, positioning, heat dissipation and lubrication, can solve the drilling processing problems of micro holes and dense holes, increase the hole-location accuracy, increase the drilling lamination number, improve the production capacity, avoid the quality problems such as hole plugging, film falling of the aluminum sheets, and the like, and has the advantages of good environmental resistance and convenient storage.

Description

technical field [0001] The invention relates to the technical field of a water-based polyurethane coating for film-coated aluminum sheets, in particular to a water-based polyurethane coating for film-coated aluminum sheets specially used for drilling printed circuit boards. The coating coated with the water-based polyurethane coating has buffering, positioning, The effect of heat dissipation and lubrication can solve the problem of drilling small holes and dense holes, improve the accuracy of hole positions, increase the number of drilled stacks and increase production capacity, and can be used for IC substrates, soft and rigid boards, HDI boards, soft boards, automobiles Drilling of slabs, thick plates and common printed circuit boards. Background technique [0002] At present, high-density printed circuit boards and drilling processes are one of the important electronic materials in the information industry. With the improvement of the wiring density of printed circuit bo...

AI Technical Summary

Problems solved by technology

Ordinary aluminum sheets can no longer meet the requirements of drilling precision. At the same time, the film-coated aluminum sheets on the market currently have problems such as clogging and film falling, poor environmental adaptability, and intolerance to storage.

Images