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Cross-blending material between polythene in high density and polythene in superhigh molecular weight

A high-density polyethylene and ultra-high molecular weight technology, applied in the field of polyethylene materials, can solve the problems affecting the appearance of high-density polyethylene and ultra-high molecular weight polyethylene blended blown films, the high viscosity of ultra-high molecular weight polyethylene, extrusion Increase the output power, etc., to achieve the effect of improving the degree of dispersion, increasing the dispersibility, and reducing the crystal point and particle size

Active Publication Date: 2007-07-25
广州广化塑料管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum particle size of these particles gradually increases with the increase of the ultra-high molecular weight polyethylene content, which seriously affects the appearance of the blown film blended with high-density polyethylene and ultra-high molecular weight polyethylene.
Moreover, due to the extremely high viscosity of ultra-high molecular weight polyethylene, the extrusion power of the blend of high-density polyethylene and ultra-high molecular weight polyethylene increases during twin-screw extrusion granulation, and processing is difficult.

Method used

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  • Cross-blending material between polythene in high density and polythene in superhigh molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0028] (1) 2.4 kilograms of ultra-high molecular weight polyethylene (mass content 80%) and the composite dispersant of mass content 20% (480 grams of medium molecular weight polyethylene / 120 grams of carbon octadecane petroleum hydrocarbons) are mixed in a high-speed mixer , and then mixed and granulated in a twin-screw extruder. The temperature of each section of the extruder is between 180 and 250 ° C, and the screw speed is 350 rpm to obtain the modified UHMWPE.

[0029] (2) Ultra-high molecular weight polyethylene after modification and elastomer POE, high-density polyethylene respectively by 375 grams / 300 grams / 2325 grams (embodiment 1), 750 grams / 300 grams / 1950 grams (embodiment 2) and 1125 g / 300 g / 1575 g (embodiment 3) were co-extruded in a twin-screw extruder, and the mass content of UHMWPE in the blend was 10%, 20% and 30%, respectively. The melting temperatures of the extruded materials were 200°C, 220°C and 240°C respectively, and the screw speed was 350rpm, so tha...

Embodiment 4-6

[0039] (1) Mix 2.1 kg of UHMWPE with 0.9 kg of composite dispersant MMWPE and polyethylene wax in a high-speed mixer, and the mass ratio of MMWPE to polyethylene wax is 4 / 1. Then blend and granulate in a twin-screw extruder, the temperature of each section of the extruder is 180-250° C., and the screw speed is 250 rpm.

[0040] (2) modified ultra-high molecular weight polyethylene and elastomer POE, high-density polyethylene by 429 grams / 150 grams / 2421 grams (embodiment 4), 857 grams / 150 grams / 1993 grams (embodiment 5), 1286g / 150g / 1564g (Example 6) were co-extruded in a twin-screw extruder, and the mass content of ultra-high molecular weight polyethylene in the blend was 10%, 20% and 30%, respectively. The melting temperatures of the extruded materials were 200°C, 230°C and 240°C, respectively, and the screw speed was 250rpm, so that the special material for the blended film of high-density polyethylene and ultra-high molecular weight polyethylene was obtained. The melt flow ...

example 4

[0044] The polarized light micrograph of the film appearance made in Example 4 is shown in Figure 5, the appearance of the film of Example 5 is basically similar to that of Figure 5, and the polarized photomicrograph of the film appearance of Example 6 is shown in Figure 6. The film was blown smoothly, and there were no obvious crystal points of incompletely melted ultra-high molecular weight polyethylene on the surface. The film was smooth in appearance and good in transparency. Has little effect.

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Abstract

This invention discloses a method for preparing a blend of high-density polyethylene and ultrahigh molecular weight polyethylene, and its application. The method comprises: modifying ultrahigh molecular weight polyethylene with composite dispersant (resin with low melting point and low viscosity, and lubricant), blending with high-density polyethylene, and extruding. The blend comprises: ultrahigh molecular weight polyethylene 10-30 wt. %, composite dispersant 2-15 wt. %, and high-density polyethylene 5-10 wt. %. The obtained blend has a melt flow index of 0.1-0.3 g / 10 min (190 deg.C, 2.16 kg), and can be processed into thin film of 20-100 mum by blow molding or tape casting. The thin film prepared by blow molding has higher tensile and tearing strength than neat high-density polyethylene thin film, and fewer crystal spots on the surface than that prepared by simple blending.

Description

technical field [0001] The invention relates to a polyethylene material, in particular to a high-density polyethylene and ultra-high molecular weight polyethylene blend material, a preparation method thereof and an application for preparing a film. Background technique [0002] High-density polyethylene (HDPE) film is widely used in the packaging of agricultural films and various powdered industrial products and daily necessities due to its excellent tensile strength and barrier properties. However, when packaging items with sharp protruding parts, its There are also deficiencies in puncture resistance. As a polymer with excellent comprehensive properties, ultra-high molecular weight polyethylene (UHMWPE) is widely used in high-strength fibers and wear-resistant materials. The addition of ultra-high molecular weight polyethylene to high-density polyethylene film can solve the problems of inconsistent strength in vertical and horizontal directions and easy longitudinal damag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06B29B9/06B29C47/92B29C55/28B29C48/92
CPCB29C47/92
Inventor 赵建青左建东刘述梅蒋智杰刘运春
Owner 广州广化塑料管道有限公司
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