Efficient polypropylene wax production process

Abstract

The invention provides an efficient polypropylene wax production process and belongs to the technical field of high polymer materials. The efficient polypropylene wax production process provided by the invention has the benefits that through adding a maleic anhydride grafting monomer to a polypropylene wax production formula, the surface polarity and the processing fluidity of polypropylene wax are improved, so that the compatibilization of a compatibilizer in the formula, the surface activation effect of a coupling agent and the improved processing flow property of a lubricant are simultaneously improved, the reaction period of polypropylene wax is shortened, the carbonation rate in the polypropylene wax production process is reduced, and the production yield of the polypropylene wax is improved; moreover, a supported metallocene catalyst is used for catalyzing the propylene bulk polymerization to obtain a granular polypropylene wax semi-finished product, and the polypropylene wax semi-finished product is uniform in particles; the technical defect in the prior art that when the polypropylene wax product is discharged in the form of a melt, a reactor is often clogged during discharge due to large viscosity of a polymer melt is overcome; according to the efficient polypropylene wax production process provided by the embodiment of the invention, the polymerization reaction activity is high, the obtained polypropylene wax product is controllable in number-average molecular weight and narrow in distribution quantity and distribution range.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-efficiency production process of polypropylene wax. Background technique [0002] Polypropylene wax is widely used in high-tech fields, such as paper coating toner and film condensation, and also includes pigment dispersants, lubricants, mold release agents for various synthetic resin molding, printing inks and coatings. Modifiers and fabric treatment aids, etc. [0003] At present, there are three methods for producing polypropylene wax. The first method is propylene-regulated polymerization, which is a conventional way to synthesize polypropylene wax. It can accurately control the molecular weight and has a narrow molecular weight distribution. However, this method requires high temperature and high pressure, and the process is complicated, so it is not suitable for small-scale production. The second reaction extrusion method, this method is convenient and qu...

AI Technical Summary

Problems solved by technology

However, due to the poor mixing of polypropylene in the extruder, this method is likely to cause deterioration of the heat transfer state. In order to meet the heat required for cracking, the reaction temperature must be increased, resulting in a decrease in yield, and it is prone to sticking to the wall and carbonization, which seriously affects product quality.

The third kind of stirred tank thermal cracking method is the method commonly used in China at present, but this method is difficult to stir due to the high viscosity of polypropylene wax in the initial stage of reaction, resulting in uneven temperature, and the melt adheres to the stirring and kettle wall The upper part is overheated and carbonized, and the carbides fall into the product and affect the product quality

[0004] The existing polypropylene wax is generally produced under the catalytic conditions of the catalyst, and the process is complicated. In order to ensure the activity of the catalyst, the process control conditions are complicated, so that the quality and stability of the produced polypropylene wax cannot be effectively guaranteed.