Regeneration method of waste polyethylene

A technology of waste polyethylene and recycled polyethylene, which is applied in applications, household appliances, and other household appliances, can solve the problems of poor performance of recycled polyethylene, limited usage and range of use, and avoid performance degradation and save energy. Manpower and material resources, the effect of saving resources

Active Publication Date: 2012-07-04
ZHEJIANG DONGGUAN PLASTIC DUCT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a waste polyethylene regeneration technology and a polyethylene pipe preparation method, which solves the problems of poor performance of traditional recycled polyethylene, limited usage and range of use, reduces environmental pollution, saves resources, and is beneficial to the development of the plastics industry. sustainable development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A melt flow rate meter was used to measure the melt flow rate of the waste polyethylene, and the melt flow rate of the waste polyethylene used in this example was 0.18 g / 10 min.

[0027]Calcium carbonate is placed in the high-speed mixer, and under the state of 1250r / min, the acetone solution containing 10wt% stearate is added dropwise in the high-speed mixer, and then mixed for 10min in the mixer of 2500r / min at 80°C, The modified calcium carbonate is placed in an oven at 60° C. until constant weight to obtain surface-modified calcium carbonate, and the mass ratio of calcium carbonate to stearic acid is 100:1.

[0028] Formula: DCP: 1.44g; above-mentioned surface modified calcium carbonate: 16g; waste polyethylene: 782.56g,

[0029] 2wt% surface-modified calcium carbonate, 0.18wt% DCP, and 97.82wt% waste polyethylene were mixed in a high-speed mixer at 2500r / min at 50°C for 5 minutes, and then cross-linked in a twin-screw extruder at 180-195°C , in-situ dispersion to ...

Embodiment 2

[0032] A melt flow rate meter was used to measure the melt flow rate of the waste polyethylene, and the melt flow rate of the waste polyethylene used in this example was 2 g / 10 min.

[0033] Put the wollastonite in the high-speed mixer, and add the dichloromethane solution containing 15wt% titanate coupling agent NDZ105 dropwise into the high-speed mixer at 1300r / min, and then 2700r / min at 80°C The modified wollastonite was mixed in a mixer for 13 minutes, and the modified wollastonite was placed in an oven at 70° C. until constant weight to obtain surface-modified wollastonite. The mass ratio of wollastonite to titanate coupling agent NDZ105 is 100:2.

[0034] Formula: DCP: 1.44g; above surface modified wollastonite: 16g; waste polyethylene: 782.56g

[0035] 2wt% surface-modified wollastonite, 0.18wt% DCP, and 97.82wt% waste polyethylene were mixed in a high-speed mixer at 2750r / min at 60°C for 8 minutes, and then extruded in a twin-screw extruder at 180-195°C. Combined and...

Embodiment 3

[0038] A melt flow rate meter was used to measure the melt flow rate of the waste polyethylene, and the melt flow rate of the waste polyethylene used in this example was 0.50 g / 10 min.

[0039] Formula: DCP: 4g; polymer grade nano-montmorillonite DK1 (produced by Zhejiang Fenghong Clay Chemical Co., Ltd.): 4g; waste polyethylene: 792g

[0040] 0.5wt% polymer-grade nano-montmorillonite, 0.5wt% DCP, and 99wt% waste polyethylene were mixed in a high-speed mixer at 2250r / min at 30°C for 3 minutes, and then mixed in a twin-screw extruder at 180-195°C Cross-linking and in-situ dispersion to obtain regenerated polyethylene. The regenerated polyethylene melt enters the head of the extruder at 165°C matching the 160mm pipe through a 70rad / min metering melt pump, and is cooled and shaped at 60-80°C to obtain Polyethylene pipe with an outer diameter of 160mm.

[0041] The properties of the polyethylene pipe prepared above: oxidation induction period (200°C) ≥ 38min, elongation at break ...

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Abstract

The invention relates to a regeneration method of waste polyethylene, which uses 84.5 to 99.45 weight percent of waste polyethylene, 0.05 to 0.5 weight percent of cross-linking agent and 0.5 to 15 weight percent of nano material as the raw materials and comprises the following steps: mixing the raw materials in a high-speed mixing machine for 3 to 8 minutes at a speed of 2,250 to 2,750 revolutions per minute at a temperature of 30 to 60 DEG C; carrying out crosslinking and in situ dispersing on the mixture in a double-screw extruder of which the temperature is between 180 and 195 DEG C to obtain regenerated polyethylene in a molten state; making the regenerated polyethylene in a molten state enter a plastic pipe extruder head of which the temperature is between 160 and 175 DEG C by the double-screw extruder through a melt pump which has a set measurement quantity and is connected in series with the double-screw extruder; and preparing a polyethylene pipe by a one-step method by carrying out cooling shaping on the obtained product at a temperature of between 50 and 90 DEG C. The regeneration method utilizes the one-step method to complete regeneration of the waste polyethylene and preparation of the polyethylene pipe. After being modified, the material is not cooled, but is directly subjected to extrusion molding by the melt pump, thus, the electric energy is saved. The waste PE is recycled, thus, the cost is low and the product performance is high.

Description

(1) Technical field [0001] The invention relates to waste plastic regeneration technology and a pipe preparation method, in particular to a method for preparing polyethylene pipes from waste polyethylene (PE) by one-step regeneration. (2) Background technology [0002] With the rapid development of the plastics industry, polyethylene, as a general-purpose plastic, is widely used in daily necessities, construction, automobile manufacturing and other fields. Especially in the field of pipes, due to the characteristics of good flexibility, corrosion resistance, and easy construction and installation, polyethylene pipes are widely used in municipal and building water supply and drainage, gas, heating, wire and cable threading, agricultural water-saving irrigation and industrial sewage. , Mine mineral transportation and other fields. At present, PE pipe has become the second largest plastic pipe variety in the world after PVC. However, with the expansion of polyethylene applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K13/06C08K9/04C08K3/26C08K9/06C08K3/34C08K5/14B29B17/00B29C47/92B29L23/00B29C48/92
CPCB29C48/92B29C2948/92161B29C2948/924B29C2948/92704B29C2948/92895B29C2948/92923
Inventor 王旭楼红尧施燕琴陈思徐建明
Owner ZHEJIANG DONGGUAN PLASTIC DUCT
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