Nano imvite talcum powder rotantional moulding-gradecross-linked polyethylene composite material and preparation method thereof

Abstract

The invention relates to a cross-linked polyethylene composite material and a preparation method thereof, in particular to a nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material and a preparation method thereof. The nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material consists of components A and B, wherein the component A comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent; and the component B comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 5-15% of nano imvite, 5-10% of superfine talcum powder, 0.1-1.0% of dispersed lubricant, 0.2-0.5% of surface finishing agent, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent. In the invention, the used basic resin is a composite material of the high-density polyenthylene and the linear low-density polyenthylene, thereby ensuring abundant cross-linking efficiency and greatly lowering the reduction of crystallinity, so that the cross-linked material has the advantages of excellent rigidity and hardness as well as good chemical corrosion resistance and barrier property.

Description

technical field [0001] The invention relates to a cross-linked polyethylene composite material and a preparation method thereof, in particular to a nano-montmorillonite talc powder rotational molding grade cross-linked polyethylene composite material suitable for automobile and motorcycle fuel tanks and its preparation method. Background technique [0002] Because the rotational molding process is suitable for forming large-scale hollow containers, and the internal stress of the product is very small, it has been developed rapidly in our country, and the products are becoming more and more extensive. The demand for the amount and variety of raw materials in the rotational molding process is also increasing. At present, among the domestic rotational molding raw materials, polyethylene and its physical modification materials account for 95%, of which linear low density polyethylene accounts for 93%. %. Because linear low density polyethylene has the advantages of good stress...

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Problems solved by technology

Patent CN 1876706A discloses a preparation method of silane cross-linked polyethylene plastic, which is widely used in anti-cracking pipes and cable materials, but the materials formed by this process must be post-treated in a water bath (or steam bath), which increases the process flow and cost, and the degree of cross-linking of the material is not high, which cannot meet the performance requirements of the fuel tank barrier

Patents CN1524899A and CN1523052A use linear low-density polyethylene and low-density polyethylene compound as the base resin, and use peroxide cross-linking technology to prepare cross-linked polyethylene rotomoulding special materials. The cross-linked polyethylene prepared by this process has good resistance Impact and chemical resistance, but the two raw materials are low-density polyethylene, the corrosion resistance of the raw materials is relatively poor, after cross-linking, the density is further reduced, although the material will not be corroded by dissolution, it is easily corroded by swelling, In fact, it is not suitable for gasoline tanks with high requirements on corrosion and barrier properties; in order to obtain higher barrier properties, CN1569942A announced the preparation method of nano-montmorillonite modified cross-linked polyethylene. After adding nano-montmorillonite, the material’s The strength and barrier properties have been improved to a certain extent, but this method is to melt and compound montmorillonite and cross-linked polyethylene. Due to the high viscosity of cross-linked polyethylene, it becomes difficult to uniformly disperse montmorillonite in cross-linked polyethylene. , and due to the large viscosity of the system, the material invented by this patent is suitable for compression molding, but not for rotational molding

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