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

摘要

The water base adhesion promotos 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; andwater;and is characterized by having:a combination ratio of 25~90 weight % as of the grafted polypropylene chloride to the total of the grafted polypopylene 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; anda 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 the polypropylene material is beforehand cleaned and then the above water base adhesion promotor is applied, and then dried; anda coating step in which a paint is coated to the material after the pretreatment step.