Modified PP reclaimed material and preparation method thereof

Abstract

The invention relates to the technical field of modified reclaimed materials, and especially relates to a modified PP reclaimed material and a preparation method thereof. The preparation method of the modified PP reclaimed material comprises the following steps: S1, adding a rubber regenerant and a compatilizer into a reactor, and evenly blending to obtain a rubber solution; S2, uniformly blending the rubber solution prepared in step S1 with rubber powder, filtering, and drying to prepare pretreated rubber powder; and S3, blending and extruding the pretreated rubber powder prepared in step S2, a PP regenerated material and an antioxidant to prepare modified PP. According to the preparation method of the modified PP reclaimed material, the fusion degree of the rubber powder and the PP reclaimed material can be improved, and the impact strength of the PP reclaimed material is effectively improved.

Description

technical field [0001] The invention relates to the technical field of modified recycled materials, in particular to a modified PP recycled material and a preparation method thereof. Background technique [0002] Recycled polypropylene (PP) plastics recycled from waste household appliances and other plastic products have an impact strength of only 6-12KJ / cm due to aging. 2 , which is significantly lower than PP new material (≥32KJ / cm 2 ), therefore, improving the impact strength of PP recycled materials through modification has practical industrial significance. At present, rubber powder is used to modify PP recycled materials, however, figure 1 As shown, the surface of rubber powder is rough and has a large number of irregular small void structures, while plastic melts such as PP and PE have high viscosity, and it is difficult to immerse in the irregular small voids of rubber powder, resulting in mechanical structure defects and affecting the strength of the blend system....

AI Technical Summary

Problems solved by technology

At present, rubber powder is used to modify PP recycled materials, however, figure 1 As shown, the surface of rubber powder is rough, with a large number of irregular small void structures, while plastic melts such as PP and PE have high viscosity, and it is difficult to immerse in the irregular small voids of rubber powder, resulting in mechanical structure defects and affecting the strength of the blend system.

[0003] Patent application number CN201110448757.3 discloses a tire rubber powder modified recycled material and its preparation method. The method includes step 1, sorting, crushing, cleaning and drying the recovered waste plastics, and then adding them to a high-speed mixer Mix well in the middle and set aside; step 2, fully mix the plastic processed in step 1, waste tire rubber powder and other processing aids in a high-speed mixer; step 3, use the mixed material after step 2 The twin-screw extruder is melt-blended and extruded to granulate, but the preparation method of the recycled material is only simple blending. From the above analysis, it can be seen that the fine void structure of the rubber powder leads to poor fusion between the rubber powder and the PP material, resulting in the modification The impact strength effect of the final PP material is limited

[0004] The document "Research on the Application of Rubber Rejuvenator De-link in Toughening Waste PP Composite Materials with Waste Tire Rubber Powder" proposes that by using the regenerant De-link to reduce the crosslinking density of tire rubber powder, the regenerant partially restores the viscosity of the rubber. In this way, the fusion degree of rubber powder and PP material is improved, and a high toughening effect is achieved, but there is no compatibilizer in the formula, which affects the interface effect of rubber / material, and still results in limited impact strength of the modified PP material

[0005] In the literature "Research on the application of rubber reclaimer and compatibilizer in tire rubber powder toughened waste PP composite materials", although the compatibilizer is added, the compatibilizer is simply blended with the PP material, which leads to phase failure. The compatibilizer is dispersed in the PP material, and there is little contact with the rubber powder. The effect of the compatibilizer can only be reflected when the amount of the compatibilizer is high, which still seriously affects the impact strength effect of the modified PP material and increases the production cost. In addition, the method disclosed in this document uses the rubber powder of the freezing method, and the cost is much higher than that of ground rubber powder at room temperature, which is not conducive to industrialization

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