Water base adhesion promotor for polypropylene and method for coating to polypropylene materials using the promotor

摘要

The water base adhesion promotor for polypropylene comprises:;a grafted polypropylene chloride, which includes a polypropylene chloride moiety and a maleic anhydride moiety as bonded thereto, and which has a chlorine content of 15˜25 weight % and a maleic anhydride moiety content of 1˜5 weight %;;an amine-neutralized water-soluble resin;;a wettability-improving agent; and;water; and is characterized by having:;a combination ratio of 25˜90 weight % as of the grafted polypropylene chloride to the total of the grafted polypropylene chloride and the amine-neutralized water-soluble resin;;a combination ratio of 2.5˜6.0 weight % as of the wettability-improving agent to the entirety of the promotor; and;a solid content of 2˜10 weight % of the entirety of the promotor.;The method for coating to polypropylene materials comprises:;a pretreatment step in which a polypropylene material is beforehand washed, and then immersed into the above water base adhesion promotor, and then dried; and;a coating step in which a paint is coated to the material after the pretreatment step.