High-filling filler modified polyolefin composite material, preparation method and application thereof

Abstract

The invention belongs to the technical field of preparation of modified composite materials, and particularly relates to a high-filling filler modified polyolefin composite material, a preparation method and application thereof. The preparation method comprises the following steps of: mixing powder with a dispersing agent aqueous solution and uniformly stirring the substances to obtain a powder slurry; using a double-screw extruder as a first-stage extruder, blanking polyolefin resin from a main feeding hole of the first-stage extruder, and meanwhile, pressing the powder slurry into a plasticizing area in the middle of the first-stage extruder; adopting a double-screw extruder as a second-stage extruder positioned below the first-stage extruder, wherein the length-diameter ratio of a screwrod is greater than 48:1; enabling a composite material melt extruded by the first-stage extruder to flow into a main feeding port of the second-stage extruder for blanking, and carrying out melt mixing extrusion, cooling, drying and grain-sized dicing to obtain the high-filling filler modified polyolefin composite material. The two-stage extrusion aqueous solution dispersion technology is adopted, dispersion of high-filling-amount powder in the polyolefin material is facilitated, the modified material has excellent physical and mechanical properties, the manufacturing method is simple, and the material performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of preparation of modified composite materials, and in particular relates to a high-filler modified polyolefin composite material and its preparation method and application. Background technique [0002] Polyolefin is a common plastic material. It has the characteristics of wide processing conditions, high processing stability and relatively low price. It is a common plastic material in daily life. Adding inorganic powder to polyolefin plastics can improve the performance of plastic materials, accelerate crystallization, improve heat resistance and reduce costs effectively. It is currently the most widely used type of plastic in plastic products. The amount of filler added in polyolefin plastics is significantly affected by processing restrictions, and a large amount of powder filling has a significant impact on the fluidity, melt strength and other properties of the melt. It is usually difficult to achieve ...

AI Technical Summary

Problems solved by technology

As mentioned in patent CN200910057463.0, the carbon nanotube dispersion of grafted silane coupling agent and polypropylene are co-extruded, and the cross-linking dispersion is realized by hydrolysis of the silane end group, but in fact this mixing process is completely random , the cross-linking is also random, and the dispersion of the powder in the melt cannot be controlled

Patent CN201420045127.0 mentions the use of nano-water-based dispersion liquid to assist mixing extrusion and injection molding to prepare polymer nanocomposite materials. The use of nano-powder water-based dispersion liquid, due to the expansion effect and lubricating effect of water vapor, makes the barrel The internal pressure increases, so that the dispersibility of the screw is greatly reduced. At the same time, the solid content of the nanofluid itself is extremely low, and it is impossible to achieve the effect of high filling.

[0005] Based on the above, there are still big problems in the production and manufacture of polyolefin composites filled with high fillers, and it is difficult to obtain highly filled polyolefin composites on the premise of ensuring the physical properties of the material