Method for preparing modified chlorinated polypropylene and paint produced by modified chlorinated polypropylene for plastic-steel doors and windows

The invention discloses modification of chlorinated polypropylene and paint prepared by the chlorinated polypropylene for plastic-steel doors and windows. In the modification, the chlorinated polypropylene is modified by adopting composite acrylic monomers by virtue of a heterogeneous graft technology, and a polar group is introduced into the backbone, so that the backbone can be dissolved in an ester solvent. The modified resin has higher hardness and excellent low-temperature usability by regulating the proportion of soft and hard monomers. The finished product paint is prepared by using modified chlorinated polypropylene resin as a main film forming substance, adding dispersant, defoaming agent, flatting agent, ultraviolet absorbent and pigment, preparing materials, dispersing, grinding, stirring and filtering. According to the preparation method and the pain, colorization of plastic-steel doors and windows is realized, the fullness of the paint coating is improved, and color changing is flexible; the pain