Toughening modifier for preparing polyvinyl chloride, polyvinyl chloride composition and application

The invention provides a toughening modifier for preparing polyvinyl chloride, a polyvinyl chloride composition and application, the toughening modifier comprises chlorinated polyethylene, and the Mooney viscosity (ML (1 + 4) 125 DEG C) of the chlorinated polyethylene is 5-40; and the chlorinated polyethylene is obtained by carrying out chlorination reaction on polyethylene, and the stirring speed is controlled to be 100-150rpm in the chlorination reaction process. The polyvinyl chloride composition comprises the following components in parts by weight: 3-15 parts of a toughening modifier, 100 parts of polyvinyl chloride resin, 0.8-3 parts of a stabilizer, 0.5-2 parts of a processing aid, 0.2-1 part of an internal lubricant and 0.1-0.5 part of an external lubricant, and the polyvinyl chloride composition can be applied to toys and packaging materials. The toughening modifier provided by the invention can obviously improve the transparency and toughness of the polyvinyl chloride product. 本发明提供了一种制备聚氯乙烯用的增韧改性剂、