Rotational molding wear-resistant polyolefin resin and preparation method thereof

Abstract

The invention discloses a rotational molding wear-resistant polyolefin resin and a preparation method thereof. In the rotational molding wear-resistant polyolefin resin, raw materials commonly used in the rotational molding process, namely linear low-density polyethylene, high-density polyethylene or polypropylene is taken as a matrix material; and by adding components of an inorganic filler, ultrahigh molecular weight polyethylene and a lubricant, the wear resistance of the matrix resin is improved. The rotational molding wear-resistant polyolefin resin consists of the following components in percentage by mass: 70 to 80 percent of matrix resin, 10 to 15 percent of inorganic filler subjected to surface treatment, 4 to 13 percent of ultrahigh molecular weight polyethylene and 1.5 to 2 percent of lubricant, wherein the matrix resin is the linear low-density polyethylene, the high-density polyethylene or the polypropylene; and a range of a melt flow rate of the matrix resin is between 2g / 10min and 15g / 10min.

Description

technical field [0001] The invention relates to a composite material and its preparation, more specifically to a rotational-grade wear-resistant polyolefin resin and its preparation method. Background technique [0002] There are many kinds of processing and molding processes for plastics and their composite materials. In addition to common extrusion molding, injection molding, blow molding and other processes, rotational molding is also a processing method for plastic products. [0003] Rotational molding is also known as rotary molding, rotary molding, rotary casting, rotary molding, etc., and the English expression is "Rotational Molding". The rotomolding process is to add plastic raw materials into the mold first, then the mold is continuously rotated along two vertical axes and heated, and the plastic raw materials in the mold are gradually and evenly coated and melted and adhered to the mold under the action of gravity and heat. The entire surface of the cavity is mol...

AI Technical Summary

Problems solved by technology

[0007] However, due to its own national composition and structural characteristics, polymer materials have the following disadvantages: extremely small surface energy, low surface tension, difficult to generate surface adsorption with filler particles, and poor surface adhesion; low hardness, intermolecular The force is small, under the action of external force, the macromolecular chain will slip or break, and the wear will be greater; the surface hardness is poor, the resistance to abrasive wear and fatigue wear is poor; the creep resistance is poor; the thermal conductivity is poor, which is easy to cause thermal expansion, thermal Fatigue and Thermal Distortion

[0008] At the same time, due to the particularity of UHMWPE's own structure, there are still some special difficulties in the actual processing and molding process, such as: the critical shear rate of UHMWPE is very low, about 10 -2 the s -1 , so melt fracture often occurs during extrusion molding; UHMWPE melt is a rubbery high-viscosity elastomer, and its melt viscosity is as high as 10 8 Pa s, almost no fluidity; UHMWPE has low thermal conductivity and large shrinkage, so it is easy to deform during the cooling process in the mold, and it is difficult to obtain products with good apparent quality